| /* Build expressions with type checking for C++ compiler. |
| Copyright (C) 1987-2013 Free Software Foundation, Inc. |
| Hacked by Michael Tiemann (tiemann@cygnus.com) |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| |
| /* This file is part of the C++ front end. |
| It contains routines to build C++ expressions given their operands, |
| including computing the types of the result, C and C++ specific error |
| checks, and some optimization. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "tree.h" |
| #include "cp-tree.h" |
| #include "flags.h" |
| #include "diagnostic.h" |
| #include "intl.h" |
| #include "target.h" |
| #include "convert.h" |
| #include "c-family/c-common.h" |
| #include "c-family/c-objc.h" |
| #include "params.h" |
| |
| static tree pfn_from_ptrmemfunc (tree); |
| static tree delta_from_ptrmemfunc (tree); |
| static tree convert_for_assignment (tree, tree, impl_conv_rhs, tree, int, |
| tsubst_flags_t, int); |
| static tree cp_pointer_int_sum (enum tree_code, tree, tree); |
| static tree rationalize_conditional_expr (enum tree_code, tree, |
| tsubst_flags_t); |
| static int comp_ptr_ttypes_real (tree, tree, int); |
| static bool comp_except_types (tree, tree, bool); |
| static bool comp_array_types (const_tree, const_tree, bool); |
| static tree pointer_diff (tree, tree, tree, tsubst_flags_t); |
| static tree get_delta_difference (tree, tree, bool, bool, tsubst_flags_t); |
| static void casts_away_constness_r (tree *, tree *, tsubst_flags_t); |
| static bool casts_away_constness (tree, tree, tsubst_flags_t); |
| static void maybe_warn_about_returning_address_of_local (tree); |
| static tree lookup_destructor (tree, tree, tree); |
| static void warn_args_num (location_t, tree, bool); |
| static int convert_arguments (tree, vec<tree, va_gc> **, tree, int, |
| tsubst_flags_t); |
| |
| /* Do `exp = require_complete_type (exp);' to make sure exp |
| does not have an incomplete type. (That includes void types.) |
| Returns error_mark_node if the VALUE does not have |
| complete type when this function returns. */ |
| |
| tree |
| require_complete_type_sfinae (tree value, tsubst_flags_t complain) |
| { |
| tree type; |
| |
| if (processing_template_decl || value == error_mark_node) |
| return value; |
| |
| if (TREE_CODE (value) == OVERLOAD) |
| type = unknown_type_node; |
| else |
| type = TREE_TYPE (value); |
| |
| if (type == error_mark_node) |
| return error_mark_node; |
| |
| /* First, detect a valid value with a complete type. */ |
| if (COMPLETE_TYPE_P (type)) |
| return value; |
| |
| if (complete_type_or_maybe_complain (type, value, complain)) |
| return value; |
| else |
| return error_mark_node; |
| } |
| |
| tree |
| require_complete_type (tree value) |
| { |
| return require_complete_type_sfinae (value, tf_warning_or_error); |
| } |
| |
| /* Try to complete TYPE, if it is incomplete. For example, if TYPE is |
| a template instantiation, do the instantiation. Returns TYPE, |
| whether or not it could be completed, unless something goes |
| horribly wrong, in which case the error_mark_node is returned. */ |
| |
| tree |
| complete_type (tree type) |
| { |
| if (type == NULL_TREE) |
| /* Rather than crash, we return something sure to cause an error |
| at some point. */ |
| return error_mark_node; |
| |
| if (type == error_mark_node || COMPLETE_TYPE_P (type)) |
| ; |
| else if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type)) |
| { |
| tree t = complete_type (TREE_TYPE (type)); |
| unsigned int needs_constructing, has_nontrivial_dtor; |
| if (COMPLETE_TYPE_P (t) && !dependent_type_p (type)) |
| layout_type (type); |
| needs_constructing |
| = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (t)); |
| has_nontrivial_dtor |
| = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TYPE_MAIN_VARIANT (t)); |
| for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) |
| { |
| TYPE_NEEDS_CONSTRUCTING (t) = needs_constructing; |
| TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = has_nontrivial_dtor; |
| } |
| } |
| else if (CLASS_TYPE_P (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type)) |
| instantiate_class_template (TYPE_MAIN_VARIANT (type)); |
| |
| return type; |
| } |
| |
| /* Like complete_type, but issue an error if the TYPE cannot be completed. |
| VALUE is used for informative diagnostics. |
| Returns NULL_TREE if the type cannot be made complete. */ |
| |
| tree |
| complete_type_or_maybe_complain (tree type, tree value, tsubst_flags_t complain) |
| { |
| type = complete_type (type); |
| if (type == error_mark_node) |
| /* We already issued an error. */ |
| return NULL_TREE; |
| else if (!COMPLETE_TYPE_P (type)) |
| { |
| if (complain & tf_error) |
| cxx_incomplete_type_diagnostic (value, type, DK_ERROR); |
| return NULL_TREE; |
| } |
| else |
| return type; |
| } |
| |
| tree |
| complete_type_or_else (tree type, tree value) |
| { |
| return complete_type_or_maybe_complain (type, value, tf_warning_or_error); |
| } |
| |
| /* Return truthvalue of whether type of EXP is instantiated. */ |
| |
| int |
| type_unknown_p (const_tree exp) |
| { |
| return (TREE_CODE (exp) == TREE_LIST |
| || TREE_TYPE (exp) == unknown_type_node); |
| } |
| |
| |
| /* Return the common type of two parameter lists. |
| We assume that comptypes has already been done and returned 1; |
| if that isn't so, this may crash. |
| |
| As an optimization, free the space we allocate if the parameter |
| lists are already common. */ |
| |
| static tree |
| commonparms (tree p1, tree p2) |
| { |
| tree oldargs = p1, newargs, n; |
| int i, len; |
| int any_change = 0; |
| |
| len = list_length (p1); |
| newargs = tree_last (p1); |
| |
| if (newargs == void_list_node) |
| i = 1; |
| else |
| { |
| i = 0; |
| newargs = 0; |
| } |
| |
| for (; i < len; i++) |
| newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); |
| |
| n = newargs; |
| |
| for (i = 0; p1; |
| p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n), i++) |
| { |
| if (TREE_PURPOSE (p1) && !TREE_PURPOSE (p2)) |
| { |
| TREE_PURPOSE (n) = TREE_PURPOSE (p1); |
| any_change = 1; |
| } |
| else if (! TREE_PURPOSE (p1)) |
| { |
| if (TREE_PURPOSE (p2)) |
| { |
| TREE_PURPOSE (n) = TREE_PURPOSE (p2); |
| any_change = 1; |
| } |
| } |
| else |
| { |
| if (1 != simple_cst_equal (TREE_PURPOSE (p1), TREE_PURPOSE (p2))) |
| any_change = 1; |
| TREE_PURPOSE (n) = TREE_PURPOSE (p2); |
| } |
| if (TREE_VALUE (p1) != TREE_VALUE (p2)) |
| { |
| any_change = 1; |
| TREE_VALUE (n) = merge_types (TREE_VALUE (p1), TREE_VALUE (p2)); |
| } |
| else |
| TREE_VALUE (n) = TREE_VALUE (p1); |
| } |
| if (! any_change) |
| return oldargs; |
| |
| return newargs; |
| } |
| |
| /* Given a type, perhaps copied for a typedef, |
| find the "original" version of it. */ |
| static tree |
| original_type (tree t) |
| { |
| int quals = cp_type_quals (t); |
| while (t != error_mark_node |
| && TYPE_NAME (t) != NULL_TREE) |
| { |
| tree x = TYPE_NAME (t); |
| if (TREE_CODE (x) != TYPE_DECL) |
| break; |
| x = DECL_ORIGINAL_TYPE (x); |
| if (x == NULL_TREE) |
| break; |
| t = x; |
| } |
| return cp_build_qualified_type (t, quals); |
| } |
| |
| /* Return the common type for two arithmetic types T1 and T2 under the |
| usual arithmetic conversions. The default conversions have already |
| been applied, and enumerated types converted to their compatible |
| integer types. */ |
| |
| static tree |
| cp_common_type (tree t1, tree t2) |
| { |
| enum tree_code code1 = TREE_CODE (t1); |
| enum tree_code code2 = TREE_CODE (t2); |
| tree attributes; |
| |
| |
| /* In what follows, we slightly generalize the rules given in [expr] so |
| as to deal with `long long' and `complex'. First, merge the |
| attributes. */ |
| attributes = (*targetm.merge_type_attributes) (t1, t2); |
| |
| if (SCOPED_ENUM_P (t1) || SCOPED_ENUM_P (t2)) |
| { |
| if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) |
| return build_type_attribute_variant (t1, attributes); |
| else |
| return NULL_TREE; |
| } |
| |
| /* FIXME: Attributes. */ |
| gcc_assert (ARITHMETIC_TYPE_P (t1) |
| || TREE_CODE (t1) == VECTOR_TYPE |
| || UNSCOPED_ENUM_P (t1)); |
| gcc_assert (ARITHMETIC_TYPE_P (t2) |
| || TREE_CODE (t2) == VECTOR_TYPE |
| || UNSCOPED_ENUM_P (t2)); |
| |
| /* If one type is complex, form the common type of the non-complex |
| components, then make that complex. Use T1 or T2 if it is the |
| required type. */ |
| if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) |
| { |
| tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1; |
| tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2; |
| tree subtype |
| = type_after_usual_arithmetic_conversions (subtype1, subtype2); |
| |
| if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype) |
| return build_type_attribute_variant (t1, attributes); |
| else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype) |
| return build_type_attribute_variant (t2, attributes); |
| else |
| return build_type_attribute_variant (build_complex_type (subtype), |
| attributes); |
| } |
| |
| if (code1 == VECTOR_TYPE) |
| { |
| /* When we get here we should have two vectors of the same size. |
| Just prefer the unsigned one if present. */ |
| if (TYPE_UNSIGNED (t1)) |
| return build_type_attribute_variant (t1, attributes); |
| else |
| return build_type_attribute_variant (t2, attributes); |
| } |
| |
| /* If only one is real, use it as the result. */ |
| if (code1 == REAL_TYPE && code2 != REAL_TYPE) |
| return build_type_attribute_variant (t1, attributes); |
| if (code2 == REAL_TYPE && code1 != REAL_TYPE) |
| return build_type_attribute_variant (t2, attributes); |
| |
| /* Both real or both integers; use the one with greater precision. */ |
| if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) |
| return build_type_attribute_variant (t1, attributes); |
| else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) |
| return build_type_attribute_variant (t2, attributes); |
| |
| /* The types are the same; no need to do anything fancy. */ |
| if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) |
| return build_type_attribute_variant (t1, attributes); |
| |
| if (code1 != REAL_TYPE) |
| { |
| /* If one is unsigned long long, then convert the other to unsigned |
| long long. */ |
| if (same_type_p (TYPE_MAIN_VARIANT (t1), long_long_unsigned_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), long_long_unsigned_type_node)) |
| return build_type_attribute_variant (long_long_unsigned_type_node, |
| attributes); |
| /* If one is a long long, and the other is an unsigned long, and |
| long long can represent all the values of an unsigned long, then |
| convert to a long long. Otherwise, convert to an unsigned long |
| long. Otherwise, if either operand is long long, convert the |
| other to long long. |
| |
| Since we're here, we know the TYPE_PRECISION is the same; |
| therefore converting to long long cannot represent all the values |
| of an unsigned long, so we choose unsigned long long in that |
| case. */ |
| if (same_type_p (TYPE_MAIN_VARIANT (t1), long_long_integer_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), long_long_integer_type_node)) |
| { |
| tree t = ((TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2)) |
| ? long_long_unsigned_type_node |
| : long_long_integer_type_node); |
| return build_type_attribute_variant (t, attributes); |
| } |
| if (int128_integer_type_node != NULL_TREE |
| && (same_type_p (TYPE_MAIN_VARIANT (t1), |
| int128_integer_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), |
| int128_integer_type_node))) |
| { |
| tree t = ((TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2)) |
| ? int128_unsigned_type_node |
| : int128_integer_type_node); |
| return build_type_attribute_variant (t, attributes); |
| } |
| |
| /* Go through the same procedure, but for longs. */ |
| if (same_type_p (TYPE_MAIN_VARIANT (t1), long_unsigned_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), long_unsigned_type_node)) |
| return build_type_attribute_variant (long_unsigned_type_node, |
| attributes); |
| if (same_type_p (TYPE_MAIN_VARIANT (t1), long_integer_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), long_integer_type_node)) |
| { |
| tree t = ((TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2)) |
| ? long_unsigned_type_node : long_integer_type_node); |
| return build_type_attribute_variant (t, attributes); |
| } |
| /* Otherwise prefer the unsigned one. */ |
| if (TYPE_UNSIGNED (t1)) |
| return build_type_attribute_variant (t1, attributes); |
| else |
| return build_type_attribute_variant (t2, attributes); |
| } |
| else |
| { |
| if (same_type_p (TYPE_MAIN_VARIANT (t1), long_double_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), long_double_type_node)) |
| return build_type_attribute_variant (long_double_type_node, |
| attributes); |
| if (same_type_p (TYPE_MAIN_VARIANT (t1), double_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), double_type_node)) |
| return build_type_attribute_variant (double_type_node, |
| attributes); |
| if (same_type_p (TYPE_MAIN_VARIANT (t1), float_type_node) |
| || same_type_p (TYPE_MAIN_VARIANT (t2), float_type_node)) |
| return build_type_attribute_variant (float_type_node, |
| attributes); |
| |
| /* Two floating-point types whose TYPE_MAIN_VARIANTs are none of |
| the standard C++ floating-point types. Logic earlier in this |
| function has already eliminated the possibility that |
| TYPE_PRECISION (t2) != TYPE_PRECISION (t1), so there's no |
| compelling reason to choose one or the other. */ |
| return build_type_attribute_variant (t1, attributes); |
| } |
| } |
| |
| /* T1 and T2 are arithmetic or enumeration types. Return the type |
| that will result from the "usual arithmetic conversions" on T1 and |
| T2 as described in [expr]. */ |
| |
| tree |
| type_after_usual_arithmetic_conversions (tree t1, tree t2) |
| { |
| gcc_assert (ARITHMETIC_TYPE_P (t1) |
| || TREE_CODE (t1) == VECTOR_TYPE |
| || UNSCOPED_ENUM_P (t1)); |
| gcc_assert (ARITHMETIC_TYPE_P (t2) |
| || TREE_CODE (t2) == VECTOR_TYPE |
| || UNSCOPED_ENUM_P (t2)); |
| |
| /* Perform the integral promotions. We do not promote real types here. */ |
| if (INTEGRAL_OR_ENUMERATION_TYPE_P (t1) |
| && INTEGRAL_OR_ENUMERATION_TYPE_P (t2)) |
| { |
| t1 = type_promotes_to (t1); |
| t2 = type_promotes_to (t2); |
| } |
| |
| return cp_common_type (t1, t2); |
| } |
| |
| static void |
| composite_pointer_error (diagnostic_t kind, tree t1, tree t2, |
| composite_pointer_operation operation) |
| { |
| switch (operation) |
| { |
| case CPO_COMPARISON: |
| emit_diagnostic (kind, input_location, 0, |
| "comparison between " |
| "distinct pointer types %qT and %qT lacks a cast", |
| t1, t2); |
| break; |
| case CPO_CONVERSION: |
| emit_diagnostic (kind, input_location, 0, |
| "conversion between " |
| "distinct pointer types %qT and %qT lacks a cast", |
| t1, t2); |
| break; |
| case CPO_CONDITIONAL_EXPR: |
| emit_diagnostic (kind, input_location, 0, |
| "conditional expression between " |
| "distinct pointer types %qT and %qT lacks a cast", |
| t1, t2); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| /* Subroutine of composite_pointer_type to implement the recursive |
| case. See that function for documentation of the parameters. */ |
| |
| static tree |
| composite_pointer_type_r (tree t1, tree t2, |
| composite_pointer_operation operation, |
| tsubst_flags_t complain) |
| { |
| tree pointee1; |
| tree pointee2; |
| tree result_type; |
| tree attributes; |
| |
| /* Determine the types pointed to by T1 and T2. */ |
| if (TREE_CODE (t1) == POINTER_TYPE) |
| { |
| pointee1 = TREE_TYPE (t1); |
| pointee2 = TREE_TYPE (t2); |
| } |
| else |
| { |
| pointee1 = TYPE_PTRMEM_POINTED_TO_TYPE (t1); |
| pointee2 = TYPE_PTRMEM_POINTED_TO_TYPE (t2); |
| } |
| |
| /* [expr.rel] |
| |
| Otherwise, the composite pointer type is a pointer type |
| similar (_conv.qual_) to the type of one of the operands, |
| with a cv-qualification signature (_conv.qual_) that is the |
| union of the cv-qualification signatures of the operand |
| types. */ |
| if (same_type_ignoring_top_level_qualifiers_p (pointee1, pointee2)) |
| result_type = pointee1; |
| else if ((TREE_CODE (pointee1) == POINTER_TYPE |
| && TREE_CODE (pointee2) == POINTER_TYPE) |
| || (TYPE_PTRMEM_P (pointee1) && TYPE_PTRMEM_P (pointee2))) |
| { |
| result_type = composite_pointer_type_r (pointee1, pointee2, operation, |
| complain); |
| if (result_type == error_mark_node) |
| return error_mark_node; |
| } |
| else |
| { |
| if (complain & tf_error) |
| composite_pointer_error (DK_PERMERROR, t1, t2, operation); |
| else |
| return error_mark_node; |
| result_type = void_type_node; |
| } |
| result_type = cp_build_qualified_type (result_type, |
| (cp_type_quals (pointee1) |
| | cp_type_quals (pointee2))); |
| /* If the original types were pointers to members, so is the |
| result. */ |
| if (TYPE_PTRMEM_P (t1)) |
| { |
| if (!same_type_p (TYPE_PTRMEM_CLASS_TYPE (t1), |
| TYPE_PTRMEM_CLASS_TYPE (t2))) |
| { |
| if (complain & tf_error) |
| composite_pointer_error (DK_PERMERROR, t1, t2, operation); |
| else |
| return error_mark_node; |
| } |
| result_type = build_ptrmem_type (TYPE_PTRMEM_CLASS_TYPE (t1), |
| result_type); |
| } |
| else |
| result_type = build_pointer_type (result_type); |
| |
| /* Merge the attributes. */ |
| attributes = (*targetm.merge_type_attributes) (t1, t2); |
| return build_type_attribute_variant (result_type, attributes); |
| } |
| |
| /* Return the composite pointer type (see [expr.rel]) for T1 and T2. |
| ARG1 and ARG2 are the values with those types. The OPERATION is to |
| describe the operation between the pointer types, |
| in case an error occurs. |
| |
| This routine also implements the computation of a common type for |
| pointers-to-members as per [expr.eq]. */ |
| |
| tree |
| composite_pointer_type (tree t1, tree t2, tree arg1, tree arg2, |
| composite_pointer_operation operation, |
| tsubst_flags_t complain) |
| { |
| tree class1; |
| tree class2; |
| |
| /* [expr.rel] |
| |
| If one operand is a null pointer constant, the composite pointer |
| type is the type of the other operand. */ |
| if (null_ptr_cst_p (arg1)) |
| return t2; |
| if (null_ptr_cst_p (arg2)) |
| return t1; |
| |
| /* We have: |
| |
| [expr.rel] |
| |
| If one of the operands has type "pointer to cv1 void*", then |
| the other has type "pointer to cv2T", and the composite pointer |
| type is "pointer to cv12 void", where cv12 is the union of cv1 |
| and cv2. |
| |
| If either type is a pointer to void, make sure it is T1. */ |
| if (TREE_CODE (t2) == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (t2))) |
| { |
| tree t; |
| t = t1; |
| t1 = t2; |
| t2 = t; |
| } |
| |
| /* Now, if T1 is a pointer to void, merge the qualifiers. */ |
| if (TREE_CODE (t1) == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (t1))) |
| { |
| tree attributes; |
| tree result_type; |
| |
| if (TYPE_PTRFN_P (t2) && (complain & tf_error)) |
| { |
| switch (operation) |
| { |
| case CPO_COMPARISON: |
| pedwarn (input_location, OPT_Wpedantic, |
| "ISO C++ forbids comparison between " |
| "pointer of type %<void *%> and pointer-to-function"); |
| break; |
| case CPO_CONVERSION: |
| pedwarn (input_location, OPT_Wpedantic, |
| "ISO C++ forbids conversion between " |
| "pointer of type %<void *%> and pointer-to-function"); |
| break; |
| case CPO_CONDITIONAL_EXPR: |
| pedwarn (input_location, OPT_Wpedantic, |
| "ISO C++ forbids conditional expression between " |
| "pointer of type %<void *%> and pointer-to-function"); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| } |
| result_type |
| = cp_build_qualified_type (void_type_node, |
| (cp_type_quals (TREE_TYPE (t1)) |
| | cp_type_quals (TREE_TYPE (t2)))); |
| result_type = build_pointer_type (result_type); |
| /* Merge the attributes. */ |
| attributes = (*targetm.merge_type_attributes) (t1, t2); |
| return build_type_attribute_variant (result_type, attributes); |
| } |
| |
| if (c_dialect_objc () && TREE_CODE (t1) == POINTER_TYPE |
| && TREE_CODE (t2) == POINTER_TYPE) |
| { |
| if (objc_have_common_type (t1, t2, -3, NULL_TREE)) |
| return objc_common_type (t1, t2); |
| } |
| |
| /* [expr.eq] permits the application of a pointer conversion to |
| bring the pointers to a common type. */ |
| if (TREE_CODE (t1) == POINTER_TYPE && TREE_CODE (t2) == POINTER_TYPE |
| && CLASS_TYPE_P (TREE_TYPE (t1)) |
| && CLASS_TYPE_P (TREE_TYPE (t2)) |
| && !same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (t1), |
| TREE_TYPE (t2))) |
| { |
| class1 = TREE_TYPE (t1); |
| class2 = TREE_TYPE (t2); |
| |
| if (DERIVED_FROM_P (class1, class2)) |
| t2 = (build_pointer_type |
| (cp_build_qualified_type (class1, cp_type_quals (class2)))); |
| else if (DERIVED_FROM_P (class2, class1)) |
| t1 = (build_pointer_type |
| (cp_build_qualified_type (class2, cp_type_quals (class1)))); |
| else |
| { |
| if (complain & tf_error) |
| composite_pointer_error (DK_ERROR, t1, t2, operation); |
| return error_mark_node; |
| } |
| } |
| /* [expr.eq] permits the application of a pointer-to-member |
| conversion to change the class type of one of the types. */ |
| else if (TYPE_PTRMEM_P (t1) |
| && !same_type_p (TYPE_PTRMEM_CLASS_TYPE (t1), |
| TYPE_PTRMEM_CLASS_TYPE (t2))) |
| { |
| class1 = TYPE_PTRMEM_CLASS_TYPE (t1); |
| class2 = TYPE_PTRMEM_CLASS_TYPE (t2); |
| |
| if (DERIVED_FROM_P (class1, class2)) |
| t1 = build_ptrmem_type (class2, TYPE_PTRMEM_POINTED_TO_TYPE (t1)); |
| else if (DERIVED_FROM_P (class2, class1)) |
| t2 = build_ptrmem_type (class1, TYPE_PTRMEM_POINTED_TO_TYPE (t2)); |
| else |
| { |
| if (complain & tf_error) |
| switch (operation) |
| { |
| case CPO_COMPARISON: |
| error ("comparison between distinct " |
| "pointer-to-member types %qT and %qT lacks a cast", |
| t1, t2); |
| break; |
| case CPO_CONVERSION: |
| error ("conversion between distinct " |
| "pointer-to-member types %qT and %qT lacks a cast", |
| t1, t2); |
| break; |
| case CPO_CONDITIONAL_EXPR: |
| error ("conditional expression between distinct " |
| "pointer-to-member types %qT and %qT lacks a cast", |
| t1, t2); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| return error_mark_node; |
| } |
| } |
| |
| return composite_pointer_type_r (t1, t2, operation, complain); |
| } |
| |
| /* Return the merged type of two types. |
| We assume that comptypes has already been done and returned 1; |
| if that isn't so, this may crash. |
| |
| This just combines attributes and default arguments; any other |
| differences would cause the two types to compare unalike. */ |
| |
| tree |
| merge_types (tree t1, tree t2) |
| { |
| enum tree_code code1; |
| enum tree_code code2; |
| tree attributes; |
| |
| /* Save time if the two types are the same. */ |
| if (t1 == t2) |
| return t1; |
| if (original_type (t1) == original_type (t2)) |
| return t1; |
| |
| /* If one type is nonsense, use the other. */ |
| if (t1 == error_mark_node) |
| return t2; |
| if (t2 == error_mark_node) |
| return t1; |
| |
| /* Handle merging an auto redeclaration with a previous deduced |
| return type. */ |
| if (is_auto (t1)) |
| return t2; |
| |
| /* Merge the attributes. */ |
| attributes = (*targetm.merge_type_attributes) (t1, t2); |
| |
| if (TYPE_PTRMEMFUNC_P (t1)) |
| t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); |
| if (TYPE_PTRMEMFUNC_P (t2)) |
| t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); |
| |
| code1 = TREE_CODE (t1); |
| code2 = TREE_CODE (t2); |
| if (code1 != code2) |
| { |
| gcc_assert (code1 == TYPENAME_TYPE || code2 == TYPENAME_TYPE); |
| if (code1 == TYPENAME_TYPE) |
| { |
| t1 = resolve_typename_type (t1, /*only_current_p=*/true); |
| code1 = TREE_CODE (t1); |
| } |
| else |
| { |
| t2 = resolve_typename_type (t2, /*only_current_p=*/true); |
| code2 = TREE_CODE (t2); |
| } |
| } |
| |
| switch (code1) |
| { |
| case POINTER_TYPE: |
| case REFERENCE_TYPE: |
| /* For two pointers, do this recursively on the target type. */ |
| { |
| tree target = merge_types (TREE_TYPE (t1), TREE_TYPE (t2)); |
| int quals = cp_type_quals (t1); |
| |
| if (code1 == POINTER_TYPE) |
| t1 = build_pointer_type (target); |
| else |
| t1 = cp_build_reference_type (target, TYPE_REF_IS_RVALUE (t1)); |
| t1 = build_type_attribute_variant (t1, attributes); |
| t1 = cp_build_qualified_type (t1, quals); |
| |
| if (TREE_CODE (target) == METHOD_TYPE) |
| t1 = build_ptrmemfunc_type (t1); |
| |
| return t1; |
| } |
| |
| case OFFSET_TYPE: |
| { |
| int quals; |
| tree pointee; |
| quals = cp_type_quals (t1); |
| pointee = merge_types (TYPE_PTRMEM_POINTED_TO_TYPE (t1), |
| TYPE_PTRMEM_POINTED_TO_TYPE (t2)); |
| t1 = build_ptrmem_type (TYPE_PTRMEM_CLASS_TYPE (t1), |
| pointee); |
| t1 = cp_build_qualified_type (t1, quals); |
| break; |
| } |
| |
| case ARRAY_TYPE: |
| { |
| tree elt = merge_types (TREE_TYPE (t1), TREE_TYPE (t2)); |
| /* Save space: see if the result is identical to one of the args. */ |
| if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) |
| return build_type_attribute_variant (t1, attributes); |
| if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) |
| return build_type_attribute_variant (t2, attributes); |
| /* Merge the element types, and have a size if either arg has one. */ |
| t1 = build_cplus_array_type |
| (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); |
| break; |
| } |
| |
| case FUNCTION_TYPE: |
| /* Function types: prefer the one that specified arg types. |
| If both do, merge the arg types. Also merge the return types. */ |
| { |
| tree valtype = merge_types (TREE_TYPE (t1), TREE_TYPE (t2)); |
| tree p1 = TYPE_ARG_TYPES (t1); |
| tree p2 = TYPE_ARG_TYPES (t2); |
| tree parms; |
| tree rval, raises; |
| |
| /* Save space: see if the result is identical to one of the args. */ |
| if (valtype == TREE_TYPE (t1) && ! p2) |
| return cp_build_type_attribute_variant (t1, attributes); |
| if (valtype == TREE_TYPE (t2) && ! p1) |
| return cp_build_type_attribute_variant (t2, attributes); |
| |
| /* Simple way if one arg fails to specify argument types. */ |
| if (p1 == NULL_TREE || TREE_VALUE (p1) == void_type_node) |
| parms = p2; |
| else if (p2 == NULL_TREE || TREE_VALUE (p2) == void_type_node) |
| parms = p1; |
| else |
| parms = commonparms (p1, p2); |
| |
| rval = build_function_type (valtype, parms); |
| gcc_assert (type_memfn_quals (t1) == type_memfn_quals (t2)); |
| gcc_assert (type_memfn_rqual (t1) == type_memfn_rqual (t2)); |
| rval = apply_memfn_quals (rval, |
| type_memfn_quals (t1), |
| type_memfn_rqual (t1)); |
| raises = merge_exception_specifiers (TYPE_RAISES_EXCEPTIONS (t1), |
| TYPE_RAISES_EXCEPTIONS (t2), |
| NULL_TREE); |
| t1 = build_exception_variant (rval, raises); |
| break; |
| } |
| |
| case METHOD_TYPE: |
| { |
| /* Get this value the long way, since TYPE_METHOD_BASETYPE |
| is just the main variant of this. */ |
| tree basetype = class_of_this_parm (t2); |
| tree raises = merge_exception_specifiers (TYPE_RAISES_EXCEPTIONS (t1), |
| TYPE_RAISES_EXCEPTIONS (t2), |
| NULL_TREE); |
| cp_ref_qualifier rqual = type_memfn_rqual (t1); |
| tree t3; |
| |
| /* If this was a member function type, get back to the |
| original type of type member function (i.e., without |
| the class instance variable up front. */ |
| t1 = build_function_type (TREE_TYPE (t1), |
| TREE_CHAIN (TYPE_ARG_TYPES (t1))); |
| t2 = build_function_type (TREE_TYPE (t2), |
| TREE_CHAIN (TYPE_ARG_TYPES (t2))); |
| t3 = merge_types (t1, t2); |
| t3 = build_method_type_directly (basetype, TREE_TYPE (t3), |
| TYPE_ARG_TYPES (t3)); |
| t1 = build_exception_variant (t3, raises); |
| t1 = build_ref_qualified_type (t1, rqual); |
| break; |
| } |
| |
| case TYPENAME_TYPE: |
| /* There is no need to merge attributes into a TYPENAME_TYPE. |
| When the type is instantiated it will have whatever |
| attributes result from the instantiation. */ |
| return t1; |
| |
| default:; |
| } |
| |
| if (attribute_list_equal (TYPE_ATTRIBUTES (t1), attributes)) |
| return t1; |
| else if (attribute_list_equal (TYPE_ATTRIBUTES (t2), attributes)) |
| return t2; |
| else |
| return cp_build_type_attribute_variant (t1, attributes); |
| } |
| |
| /* Return the ARRAY_TYPE type without its domain. */ |
| |
| tree |
| strip_array_domain (tree type) |
| { |
| tree t2; |
| gcc_assert (TREE_CODE (type) == ARRAY_TYPE); |
| if (TYPE_DOMAIN (type) == NULL_TREE) |
| return type; |
| t2 = build_cplus_array_type (TREE_TYPE (type), NULL_TREE); |
| return cp_build_type_attribute_variant (t2, TYPE_ATTRIBUTES (type)); |
| } |
| |
| /* Wrapper around cp_common_type that is used by c-common.c and other |
| front end optimizations that remove promotions. |
| |
| Return the common type for two arithmetic types T1 and T2 under the |
| usual arithmetic conversions. The default conversions have already |
| been applied, and enumerated types converted to their compatible |
| integer types. */ |
| |
| tree |
| common_type (tree t1, tree t2) |
| { |
| /* If one type is nonsense, use the other */ |
| if (t1 == error_mark_node) |
| return t2; |
| if (t2 == error_mark_node) |
| return t1; |
| |
| return cp_common_type (t1, t2); |
| } |
| |
| /* Return the common type of two pointer types T1 and T2. This is the |
| type for the result of most arithmetic operations if the operands |
| have the given two types. |
| |
| We assume that comp_target_types has already been done and returned |
| nonzero; if that isn't so, this may crash. */ |
| |
| tree |
| common_pointer_type (tree t1, tree t2) |
| { |
| gcc_assert ((TYPE_PTR_P (t1) && TYPE_PTR_P (t2)) |
| || (TYPE_PTRDATAMEM_P (t1) && TYPE_PTRDATAMEM_P (t2)) |
| || (TYPE_PTRMEMFUNC_P (t1) && TYPE_PTRMEMFUNC_P (t2))); |
| |
| return composite_pointer_type (t1, t2, error_mark_node, error_mark_node, |
| CPO_CONVERSION, tf_warning_or_error); |
| } |
| |
| /* Compare two exception specifier types for exactness or subsetness, if |
| allowed. Returns false for mismatch, true for match (same, or |
| derived and !exact). |
| |
| [except.spec] "If a class X ... objects of class X or any class publicly |
| and unambiguously derived from X. Similarly, if a pointer type Y * ... |
| exceptions of type Y * or that are pointers to any type publicly and |
| unambiguously derived from Y. Otherwise a function only allows exceptions |
| that have the same type ..." |
| This does not mention cv qualifiers and is different to what throw |
| [except.throw] and catch [except.catch] will do. They will ignore the |
| top level cv qualifiers, and allow qualifiers in the pointer to class |
| example. |
| |
| We implement the letter of the standard. */ |
| |
| static bool |
| comp_except_types (tree a, tree b, bool exact) |
| { |
| if (same_type_p (a, b)) |
| return true; |
| else if (!exact) |
| { |
| if (cp_type_quals (a) || cp_type_quals (b)) |
| return false; |
| |
| if (TREE_CODE (a) == POINTER_TYPE |
| && TREE_CODE (b) == POINTER_TYPE) |
| { |
| a = TREE_TYPE (a); |
| b = TREE_TYPE (b); |
| if (cp_type_quals (a) || cp_type_quals (b)) |
| return false; |
| } |
| |
| if (TREE_CODE (a) != RECORD_TYPE |
| || TREE_CODE (b) != RECORD_TYPE) |
| return false; |
| |
| if (publicly_uniquely_derived_p (a, b)) |
| return true; |
| } |
| return false; |
| } |
| |
| /* Return true if TYPE1 and TYPE2 are equivalent exception specifiers. |
| If EXACT is ce_derived, T2 can be stricter than T1 (according to 15.4/5). |
| If EXACT is ce_normal, the compatibility rules in 15.4/3 apply. |
| If EXACT is ce_exact, the specs must be exactly the same. Exception lists |
| are unordered, but we've already filtered out duplicates. Most lists will |
| be in order, we should try to make use of that. */ |
| |
| bool |
| comp_except_specs (const_tree t1, const_tree t2, int exact) |
| { |
| const_tree probe; |
| const_tree base; |
| int length = 0; |
| |
| if (t1 == t2) |
| return true; |
| |
| /* First handle noexcept. */ |
| if (exact < ce_exact) |
| { |
| /* noexcept(false) is compatible with no exception-specification, |
| and stricter than any spec. */ |
| if (t1 == noexcept_false_spec) |
| return t2 == NULL_TREE || exact == ce_derived; |
| /* Even a derived noexcept(false) is compatible with no |
| exception-specification. */ |
| if (t2 == noexcept_false_spec) |
| return t1 == NULL_TREE; |
| |
| /* Otherwise, if we aren't looking for an exact match, noexcept is |
| equivalent to throw(). */ |
| if (t1 == noexcept_true_spec) |
| t1 = empty_except_spec; |
| if (t2 == noexcept_true_spec) |
| t2 = empty_except_spec; |
| } |
| |
| /* If any noexcept is left, it is only comparable to itself; |
| either we're looking for an exact match or we're redeclaring a |
| template with dependent noexcept. */ |
| if ((t1 && TREE_PURPOSE (t1)) |
| || (t2 && TREE_PURPOSE (t2))) |
| return (t1 && t2 |
| && cp_tree_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))); |
| |
| if (t1 == NULL_TREE) /* T1 is ... */ |
| return t2 == NULL_TREE || exact == ce_derived; |
| if (!TREE_VALUE (t1)) /* t1 is EMPTY */ |
| return t2 != NULL_TREE && !TREE_VALUE (t2); |
| if (t2 == NULL_TREE) /* T2 is ... */ |
| return false; |
| if (TREE_VALUE (t1) && !TREE_VALUE (t2)) /* T2 is EMPTY, T1 is not */ |
| return exact == ce_derived; |
| |
| /* Neither set is ... or EMPTY, make sure each part of T2 is in T1. |
| Count how many we find, to determine exactness. For exact matching and |
| ordered T1, T2, this is an O(n) operation, otherwise its worst case is |
| O(nm). */ |
| for (base = t1; t2 != NULL_TREE; t2 = TREE_CHAIN (t2)) |
| { |
| for (probe = base; probe != NULL_TREE; probe = TREE_CHAIN (probe)) |
| { |
| tree a = TREE_VALUE (probe); |
| tree b = TREE_VALUE (t2); |
| |
| if (comp_except_types (a, b, exact)) |
| { |
| if (probe == base && exact > ce_derived) |
| base = TREE_CHAIN (probe); |
| length++; |
| break; |
| } |
| } |
| if (probe == NULL_TREE) |
| return false; |
| } |
| return exact == ce_derived || base == NULL_TREE || length == list_length (t1); |
| } |
| |
| /* Compare the array types T1 and T2. ALLOW_REDECLARATION is true if |
| [] can match [size]. */ |
| |
| static bool |
| comp_array_types (const_tree t1, const_tree t2, bool allow_redeclaration) |
| { |
| tree d1; |
| tree d2; |
| tree max1, max2; |
| |
| if (t1 == t2) |
| return true; |
| |
| /* The type of the array elements must be the same. */ |
| if (!same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
| return false; |
| |
| d1 = TYPE_DOMAIN (t1); |
| d2 = TYPE_DOMAIN (t2); |
| |
| if (d1 == d2) |
| return true; |
| |
| /* If one of the arrays is dimensionless, and the other has a |
| dimension, they are of different types. However, it is valid to |
| write: |
| |
| extern int a[]; |
| int a[3]; |
| |
| by [basic.link]: |
| |
| declarations for an array object can specify |
| array types that differ by the presence or absence of a major |
| array bound (_dcl.array_). */ |
| if (!d1 || !d2) |
| return allow_redeclaration; |
| |
| /* Check that the dimensions are the same. */ |
| |
| if (!cp_tree_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2))) |
| return false; |
| max1 = TYPE_MAX_VALUE (d1); |
| max2 = TYPE_MAX_VALUE (d2); |
| if (processing_template_decl && !abi_version_at_least (2) |
| && !value_dependent_expression_p (max1) |
| && !value_dependent_expression_p (max2)) |
| { |
| /* With abi-1 we do not fold non-dependent array bounds, (and |
| consequently mangle them incorrectly). We must therefore |
| fold them here, to verify the domains have the same |
| value. */ |
| max1 = fold (max1); |
| max2 = fold (max2); |
| } |
| |
| if (!cp_tree_equal (max1, max2)) |
| return false; |
| |
| return true; |
| } |
| |
| /* Compare the relative position of T1 and T2 into their respective |
| template parameter list. |
| T1 and T2 must be template parameter types. |
| Return TRUE if T1 and T2 have the same position, FALSE otherwise. */ |
| |
| static bool |
| comp_template_parms_position (tree t1, tree t2) |
| { |
| tree index1, index2; |
| gcc_assert (t1 && t2 |
| && TREE_CODE (t1) == TREE_CODE (t2) |
| && (TREE_CODE (t1) == BOUND_TEMPLATE_TEMPLATE_PARM |
| || TREE_CODE (t1) == TEMPLATE_TEMPLATE_PARM |
| || TREE_CODE (t1) == TEMPLATE_TYPE_PARM)); |
| |
| index1 = TEMPLATE_TYPE_PARM_INDEX (TYPE_MAIN_VARIANT (t1)); |
| index2 = TEMPLATE_TYPE_PARM_INDEX (TYPE_MAIN_VARIANT (t2)); |
| |
| /* Then compare their relative position. */ |
| if (TEMPLATE_PARM_IDX (index1) != TEMPLATE_PARM_IDX (index2) |
| || TEMPLATE_PARM_LEVEL (index1) != TEMPLATE_PARM_LEVEL (index2) |
| || (TEMPLATE_PARM_PARAMETER_PACK (index1) |
| != TEMPLATE_PARM_PARAMETER_PACK (index2))) |
| return false; |
| |
| return true; |
| } |
| |
| /* Subroutine in comptypes. */ |
| |
| static bool |
| structural_comptypes (tree t1, tree t2, int strict) |
| { |
| if (t1 == t2) |
| return true; |
| |
| /* Suppress errors caused by previously reported errors. */ |
| if (t1 == error_mark_node || t2 == error_mark_node) |
| return false; |
| |
| gcc_assert (TYPE_P (t1) && TYPE_P (t2)); |
| |
| /* TYPENAME_TYPEs should be resolved if the qualifying scope is the |
| current instantiation. */ |
| if (TREE_CODE (t1) == TYPENAME_TYPE) |
| t1 = resolve_typename_type (t1, /*only_current_p=*/true); |
| |
| if (TREE_CODE (t2) == TYPENAME_TYPE) |
| t2 = resolve_typename_type (t2, /*only_current_p=*/true); |
| |
| if (TYPE_PTRMEMFUNC_P (t1)) |
| t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); |
| if (TYPE_PTRMEMFUNC_P (t2)) |
| t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); |
| |
| /* Different classes of types can't be compatible. */ |
| if (TREE_CODE (t1) != TREE_CODE (t2)) |
| return false; |
| |
| /* Qualifiers must match. For array types, we will check when we |
| recur on the array element types. */ |
| if (TREE_CODE (t1) != ARRAY_TYPE |
| && cp_type_quals (t1) != cp_type_quals (t2)) |
| return false; |
| if (TREE_CODE (t1) == FUNCTION_TYPE |
| && type_memfn_quals (t1) != type_memfn_quals (t2)) |
| return false; |
| /* Need to check this before TYPE_MAIN_VARIANT. |
| FIXME function qualifiers should really change the main variant. */ |
| if ((TREE_CODE (t1) == FUNCTION_TYPE |
| || TREE_CODE (t1) == METHOD_TYPE) |
| && type_memfn_rqual (t1) != type_memfn_rqual (t2)) |
| return false; |
| if (TYPE_FOR_JAVA (t1) != TYPE_FOR_JAVA (t2)) |
| return false; |
| |
| /* Allow for two different type nodes which have essentially the same |
| definition. Note that we already checked for equality of the type |
| qualifiers (just above). */ |
| |
| if (TREE_CODE (t1) != ARRAY_TYPE |
| && TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) |
| return true; |
| |
| |
| /* Compare the types. Break out if they could be the same. */ |
| switch (TREE_CODE (t1)) |
| { |
| case VOID_TYPE: |
| case BOOLEAN_TYPE: |
| /* All void and bool types are the same. */ |
| break; |
| |
| case INTEGER_TYPE: |
| case FIXED_POINT_TYPE: |
| case REAL_TYPE: |
| /* With these nodes, we can't determine type equivalence by |
| looking at what is stored in the nodes themselves, because |
| two nodes might have different TYPE_MAIN_VARIANTs but still |
| represent the same type. For example, wchar_t and int could |
| have the same properties (TYPE_PRECISION, TYPE_MIN_VALUE, |
| TYPE_MAX_VALUE, etc.), but have different TYPE_MAIN_VARIANTs |
| and are distinct types. On the other hand, int and the |
| following typedef |
| |
| typedef int INT __attribute((may_alias)); |
| |
| have identical properties, different TYPE_MAIN_VARIANTs, but |
| represent the same type. The canonical type system keeps |
| track of equivalence in this case, so we fall back on it. */ |
| return TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2); |
| |
| case TEMPLATE_TEMPLATE_PARM: |
| case BOUND_TEMPLATE_TEMPLATE_PARM: |
| if (!comp_template_parms_position (t1, t2)) |
| return false; |
| if (!comp_template_parms |
| (DECL_TEMPLATE_PARMS (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t1)), |
| DECL_TEMPLATE_PARMS (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t2)))) |
| return false; |
| if (TREE_CODE (t1) == TEMPLATE_TEMPLATE_PARM) |
| break; |
| /* Don't check inheritance. */ |
| strict = COMPARE_STRICT; |
| /* Fall through. */ |
| |
| case RECORD_TYPE: |
| case UNION_TYPE: |
| if (TYPE_TEMPLATE_INFO (t1) && TYPE_TEMPLATE_INFO (t2) |
| && (TYPE_TI_TEMPLATE (t1) == TYPE_TI_TEMPLATE (t2) |
| || TREE_CODE (t1) == BOUND_TEMPLATE_TEMPLATE_PARM) |
| && comp_template_args (TYPE_TI_ARGS (t1), TYPE_TI_ARGS (t2))) |
| break; |
| |
| if ((strict & COMPARE_BASE) && DERIVED_FROM_P (t1, t2)) |
| break; |
| else if ((strict & COMPARE_DERIVED) && DERIVED_FROM_P (t2, t1)) |
| break; |
| |
| return false; |
| |
| case OFFSET_TYPE: |
| if (!comptypes (TYPE_OFFSET_BASETYPE (t1), TYPE_OFFSET_BASETYPE (t2), |
| strict & ~COMPARE_REDECLARATION)) |
| return false; |
| if (!same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
| return false; |
| break; |
| |
| case REFERENCE_TYPE: |
| if (TYPE_REF_IS_RVALUE (t1) != TYPE_REF_IS_RVALUE (t2)) |
| return false; |
| /* fall through to checks for pointer types */ |
| |
| case POINTER_TYPE: |
| if (TYPE_MODE (t1) != TYPE_MODE (t2) |
| || TYPE_REF_CAN_ALIAS_ALL (t1) != TYPE_REF_CAN_ALIAS_ALL (t2) |
| || !same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
| return false; |
| break; |
| |
| case METHOD_TYPE: |
| case FUNCTION_TYPE: |
| if (!same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
| return false; |
| if (!compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2))) |
| return false; |
| break; |
| |
| case ARRAY_TYPE: |
| /* Target types must match incl. qualifiers. */ |
| if (!comp_array_types (t1, t2, !!(strict & COMPARE_REDECLARATION))) |
| return false; |
| break; |
| |
| case TEMPLATE_TYPE_PARM: |
| /* If T1 and T2 don't have the same relative position in their |
| template parameters set, they can't be equal. */ |
| if (!comp_template_parms_position (t1, t2)) |
| return false; |
| break; |
| |
| case TYPENAME_TYPE: |
| if (!cp_tree_equal (TYPENAME_TYPE_FULLNAME (t1), |
| TYPENAME_TYPE_FULLNAME (t2))) |
| return false; |
| /* Qualifiers don't matter on scopes. */ |
| if (!same_type_ignoring_top_level_qualifiers_p (TYPE_CONTEXT (t1), |
| TYPE_CONTEXT (t2))) |
| return false; |
| break; |
| |
| case UNBOUND_CLASS_TEMPLATE: |
| if (!cp_tree_equal (TYPE_IDENTIFIER (t1), TYPE_IDENTIFIER (t2))) |
| return false; |
| if (!same_type_p (TYPE_CONTEXT (t1), TYPE_CONTEXT (t2))) |
| return false; |
| break; |
| |
| case COMPLEX_TYPE: |
| if (!same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
| return false; |
| break; |
| |
| case VECTOR_TYPE: |
| if (TYPE_VECTOR_SUBPARTS (t1) != TYPE_VECTOR_SUBPARTS (t2) |
| || !same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
| return false; |
| break; |
| |
| case TYPE_PACK_EXPANSION: |
| return (same_type_p (PACK_EXPANSION_PATTERN (t1), |
| PACK_EXPANSION_PATTERN (t2)) |
| && comp_template_args (PACK_EXPANSION_EXTRA_ARGS (t1), |
| PACK_EXPANSION_EXTRA_ARGS (t2))); |
| |
| case DECLTYPE_TYPE: |
| if (DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (t1) |
| != DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (t2) |
| || (DECLTYPE_FOR_LAMBDA_CAPTURE (t1) |
| != DECLTYPE_FOR_LAMBDA_CAPTURE (t2)) |
| || (DECLTYPE_FOR_LAMBDA_PROXY (t1) |
| != DECLTYPE_FOR_LAMBDA_PROXY (t2)) |
| || !cp_tree_equal (DECLTYPE_TYPE_EXPR (t1), |
| DECLTYPE_TYPE_EXPR (t2))) |
| return false; |
| break; |
| |
| case UNDERLYING_TYPE: |
| return same_type_p (UNDERLYING_TYPE_TYPE (t1), |
| UNDERLYING_TYPE_TYPE (t2)); |
| |
| default: |
| return false; |
| } |
| |
| /* If we get here, we know that from a target independent POV the |
| types are the same. Make sure the target attributes are also |
| the same. */ |
| return comp_type_attributes (t1, t2); |
| } |
| |
| /* Return true if T1 and T2 are related as allowed by STRICT. STRICT |
| is a bitwise-or of the COMPARE_* flags. */ |
| |
| bool |
| comptypes (tree t1, tree t2, int strict) |
| { |
| if (strict == COMPARE_STRICT) |
| { |
| if (t1 == t2) |
| return true; |
| |
| if (t1 == error_mark_node || t2 == error_mark_node) |
| return false; |
| |
| if (TYPE_STRUCTURAL_EQUALITY_P (t1) || TYPE_STRUCTURAL_EQUALITY_P (t2)) |
| /* At least one of the types requires structural equality, so |
| perform a deep check. */ |
| return structural_comptypes (t1, t2, strict); |
| |
| #ifdef ENABLE_CHECKING |
| if (USE_CANONICAL_TYPES) |
| { |
| bool result = structural_comptypes (t1, t2, strict); |
| |
| if (result && TYPE_CANONICAL (t1) != TYPE_CANONICAL (t2)) |
| /* The two types are structurally equivalent, but their |
| canonical types were different. This is a failure of the |
| canonical type propagation code.*/ |
| internal_error |
| ("canonical types differ for identical types %T and %T", |
| t1, t2); |
| else if (!result && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)) |
| /* Two types are structurally different, but the canonical |
| types are the same. This means we were over-eager in |
| assigning canonical types. */ |
| internal_error |
| ("same canonical type node for different types %T and %T", |
| t1, t2); |
| |
| return result; |
| } |
| #else |
| if (USE_CANONICAL_TYPES) |
| return TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2); |
| #endif |
| else |
| return structural_comptypes (t1, t2, strict); |
| } |
| else if (strict == COMPARE_STRUCTURAL) |
| return structural_comptypes (t1, t2, COMPARE_STRICT); |
| else |
| return structural_comptypes (t1, t2, strict); |
| } |
| |
| /* Returns nonzero iff TYPE1 and TYPE2 are the same type, ignoring |
| top-level qualifiers. */ |
| |
| bool |
| same_type_ignoring_top_level_qualifiers_p (tree type1, tree type2) |
| { |
| if (type1 == error_mark_node || type2 == error_mark_node) |
| return false; |
| |
| return same_type_p (TYPE_MAIN_VARIANT (type1), TYPE_MAIN_VARIANT (type2)); |
| } |
| |
| /* Returns 1 if TYPE1 is at least as qualified as TYPE2. */ |
| |
| bool |
| at_least_as_qualified_p (const_tree type1, const_tree type2) |
| { |
| int q1 = cp_type_quals (type1); |
| int q2 = cp_type_quals (type2); |
| |
| /* All qualifiers for TYPE2 must also appear in TYPE1. */ |
| return (q1 & q2) == q2; |
| } |
| |
| /* Returns 1 if TYPE1 is more cv-qualified than TYPE2, -1 if TYPE2 is |
| more cv-qualified that TYPE1, and 0 otherwise. */ |
| |
| int |
| comp_cv_qualification (const_tree type1, const_tree type2) |
| { |
| int q1 = cp_type_quals (type1); |
| int q2 = cp_type_quals (type2); |
| |
| if (q1 == q2) |
| return 0; |
| |
| if ((q1 & q2) == q2) |
| return 1; |
| else if ((q1 & q2) == q1) |
| return -1; |
| |
| return 0; |
| } |
| |
| /* Returns 1 if the cv-qualification signature of TYPE1 is a proper |
| subset of the cv-qualification signature of TYPE2, and the types |
| are similar. Returns -1 if the other way 'round, and 0 otherwise. */ |
| |
| int |
| comp_cv_qual_signature (tree type1, tree type2) |
| { |
| if (comp_ptr_ttypes_real (type2, type1, -1)) |
| return 1; |
| else if (comp_ptr_ttypes_real (type1, type2, -1)) |
| return -1; |
| else |
| return 0; |
| } |
| |
| /* Subroutines of `comptypes'. */ |
| |
| /* Return true if two parameter type lists PARMS1 and PARMS2 are |
| equivalent in the sense that functions with those parameter types |
| can have equivalent types. The two lists must be equivalent, |
| element by element. */ |
| |
| bool |
| compparms (const_tree parms1, const_tree parms2) |
| { |
| const_tree t1, t2; |
| |
| /* An unspecified parmlist matches any specified parmlist |
| whose argument types don't need default promotions. */ |
| |
| for (t1 = parms1, t2 = parms2; |
| t1 || t2; |
| t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) |
| { |
| /* If one parmlist is shorter than the other, |
| they fail to match. */ |
| if (!t1 || !t2) |
| return false; |
| if (!same_type_p (TREE_VALUE (t1), TREE_VALUE (t2))) |
| return false; |
| } |
| return true; |
| } |
| |
| |
| /* Process a sizeof or alignof expression where the operand is a |
| type. */ |
| |
| tree |
| cxx_sizeof_or_alignof_type (tree type, enum tree_code op, bool complain) |
| { |
| tree value; |
| bool dependent_p; |
| |
| gcc_assert (op == SIZEOF_EXPR || op == ALIGNOF_EXPR); |
| if (type == error_mark_node) |
| return error_mark_node; |
| |
| type = non_reference (type); |
| if (TREE_CODE (type) == METHOD_TYPE) |
| { |
| if (complain) |
| pedwarn (input_location, pedantic ? OPT_Wpedantic : OPT_Wpointer_arith, |
| "invalid application of %qs to a member function", |
| operator_name_info[(int) op].name); |
| value = size_one_node; |
| } |
| |
| dependent_p = dependent_type_p (type); |
| if (!dependent_p) |
| complete_type (type); |
| if (dependent_p |
| /* VLA types will have a non-constant size. In the body of an |
| uninstantiated template, we don't need to try to compute the |
| value, because the sizeof expression is not an integral |
| constant expression in that case. And, if we do try to |
| compute the value, we'll likely end up with SAVE_EXPRs, which |
| the template substitution machinery does not expect to see. */ |
| || (processing_template_decl |
| && COMPLETE_TYPE_P (type) |
| && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)) |
| { |
| value = build_min (op, size_type_node, type); |
| TREE_READONLY (value) = 1; |
| return value; |
| } |
| |
| return c_sizeof_or_alignof_type (input_location, complete_type (type), |
| op == SIZEOF_EXPR, |
| complain); |
| } |
| |
| /* Return the size of the type, without producing any warnings for |
| types whose size cannot be taken. This routine should be used only |
| in some other routine that has already produced a diagnostic about |
| using the size of such a type. */ |
| tree |
| cxx_sizeof_nowarn (tree type) |
| { |
| if (TREE_CODE (type) == FUNCTION_TYPE |
| || TREE_CODE (type) == VOID_TYPE |
| || TREE_CODE (type) == ERROR_MARK) |
| return size_one_node; |
| else if (!COMPLETE_TYPE_P (type)) |
| return size_zero_node; |
| else |
| return cxx_sizeof_or_alignof_type (type, SIZEOF_EXPR, false); |
| } |
| |
| /* Process a sizeof expression where the operand is an expression. */ |
| |
| static tree |
| cxx_sizeof_expr (tree e, tsubst_flags_t complain) |
| { |
| if (e == error_mark_node) |
| return error_mark_node; |
| |
| if (processing_template_decl) |
| { |
| e = build_min (SIZEOF_EXPR, size_type_node, e); |
| TREE_SIDE_EFFECTS (e) = 0; |
| TREE_READONLY (e) = 1; |
| |
| return e; |
| } |
| |
| /* To get the size of a static data member declared as an array of |
| unknown bound, we need to instantiate it. */ |
| if (TREE_CODE (e) == VAR_DECL |
| && VAR_HAD_UNKNOWN_BOUND (e) |
| && DECL_TEMPLATE_INSTANTIATION (e)) |
| instantiate_decl (e, /*defer_ok*/true, /*expl_inst_mem*/false); |
| |
| e = mark_type_use (e); |
| |
| if (TREE_CODE (e) == COMPONENT_REF |
| && TREE_CODE (TREE_OPERAND (e, 1)) == FIELD_DECL |
| && DECL_C_BIT_FIELD (TREE_OPERAND (e, 1))) |
| { |
| if (complain & tf_error) |
| error ("invalid application of %<sizeof%> to a bit-field"); |
| else |
| return error_mark_node; |
| e = char_type_node; |
| } |
| else if (is_overloaded_fn (e)) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids applying %<sizeof%> to an expression of " |
| "function type"); |
| else |
| return error_mark_node; |
| e = char_type_node; |
| } |
| else if (type_unknown_p (e)) |
| { |
| if (complain & tf_error) |
| cxx_incomplete_type_error (e, TREE_TYPE (e)); |
| else |
| return error_mark_node; |
| e = char_type_node; |
| } |
| else |
| e = TREE_TYPE (e); |
| |
| return cxx_sizeof_or_alignof_type (e, SIZEOF_EXPR, complain & tf_error); |
| } |
| |
| /* Implement the __alignof keyword: Return the minimum required |
| alignment of E, measured in bytes. For VAR_DECL's and |
| FIELD_DECL's return DECL_ALIGN (which can be set from an |
| "aligned" __attribute__ specification). */ |
| |
| static tree |
| cxx_alignof_expr (tree e, tsubst_flags_t complain) |
| { |
| tree t; |
| |
| if (e == error_mark_node) |
| return error_mark_node; |
| |
| if (processing_template_decl) |
| { |
| e = build_min (ALIGNOF_EXPR, size_type_node, e); |
| TREE_SIDE_EFFECTS (e) = 0; |
| TREE_READONLY (e) = 1; |
| |
| return e; |
| } |
| |
| e = mark_type_use (e); |
| |
| if (TREE_CODE (e) == VAR_DECL) |
| t = size_int (DECL_ALIGN_UNIT (e)); |
| else if (TREE_CODE (e) == COMPONENT_REF |
| && TREE_CODE (TREE_OPERAND (e, 1)) == FIELD_DECL |
| && DECL_C_BIT_FIELD (TREE_OPERAND (e, 1))) |
| { |
| if (complain & tf_error) |
| error ("invalid application of %<__alignof%> to a bit-field"); |
| else |
| return error_mark_node; |
| t = size_one_node; |
| } |
| else if (TREE_CODE (e) == COMPONENT_REF |
| && TREE_CODE (TREE_OPERAND (e, 1)) == FIELD_DECL) |
| t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (e, 1))); |
| else if (is_overloaded_fn (e)) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids applying %<__alignof%> to an expression of " |
| "function type"); |
| else |
| return error_mark_node; |
| if (TREE_CODE (e) == FUNCTION_DECL) |
| t = size_int (DECL_ALIGN_UNIT (e)); |
| else |
| t = size_one_node; |
| } |
| else if (type_unknown_p (e)) |
| { |
| if (complain & tf_error) |
| cxx_incomplete_type_error (e, TREE_TYPE (e)); |
| else |
| return error_mark_node; |
| t = size_one_node; |
| } |
| else |
| return cxx_sizeof_or_alignof_type (TREE_TYPE (e), ALIGNOF_EXPR, |
| complain & tf_error); |
| |
| return fold_convert (size_type_node, t); |
| } |
| |
| /* Process a sizeof or alignof expression E with code OP where the operand |
| is an expression. */ |
| |
| tree |
| cxx_sizeof_or_alignof_expr (tree e, enum tree_code op, bool complain) |
| { |
| if (op == SIZEOF_EXPR) |
| return cxx_sizeof_expr (e, complain? tf_warning_or_error : tf_none); |
| else |
| return cxx_alignof_expr (e, complain? tf_warning_or_error : tf_none); |
| } |
| |
| /* Build a representation of an expression 'alignas(E).' Return the |
| folded integer value of E if it is an integral constant expression |
| that resolves to a valid alignment. If E depends on a template |
| parameter, return a syntactic representation tree of kind |
| ALIGNOF_EXPR. Otherwise, return an error_mark_node if the |
| expression is ill formed, or NULL_TREE if E is NULL_TREE. */ |
| |
| tree |
| cxx_alignas_expr (tree e) |
| { |
| if (e == NULL_TREE || e == error_mark_node |
| || (!TYPE_P (e) && !require_potential_rvalue_constant_expression (e))) |
| return e; |
| |
| if (TYPE_P (e)) |
| /* [dcl.align]/3: |
| |
| When the alignment-specifier is of the form |
| alignas(type-id ), it shall have the same effect as |
| alignas(alignof(type-id )). */ |
| |
| return cxx_sizeof_or_alignof_type (e, ALIGNOF_EXPR, false); |
| |
| /* If we reach this point, it means the alignas expression if of |
| the form "alignas(assignment-expression)", so we should follow |
| what is stated by [dcl.align]/2. */ |
| |
| if (value_dependent_expression_p (e)) |
| /* Leave value-dependent expression alone for now. */ |
| return e; |
| |
| e = fold_non_dependent_expr (e); |
| e = mark_rvalue_use (e); |
| |
| /* [dcl.align]/2 says: |
| |
| the assignment-expression shall be an integral constant |
| expression. */ |
| |
| return cxx_constant_value (e); |
| } |
| |
| |
| /* EXPR is being used in a context that is not a function call. |
| Enforce: |
| |
| [expr.ref] |
| |
| The expression can be used only as the left-hand operand of a |
| member function call. |
| |
| [expr.mptr.operator] |
| |
| If the result of .* or ->* is a function, then that result can be |
| used only as the operand for the function call operator (). |
| |
| by issuing an error message if appropriate. Returns true iff EXPR |
| violates these rules. */ |
| |
| bool |
| invalid_nonstatic_memfn_p (const_tree expr, tsubst_flags_t complain) |
| { |
| if (expr && DECL_NONSTATIC_MEMBER_FUNCTION_P (expr)) |
| { |
| if (complain & tf_error) |
| error ("invalid use of non-static member function"); |
| return true; |
| } |
| return false; |
| } |
| |
| /* If EXP is a reference to a bitfield, and the type of EXP does not |
| match the declared type of the bitfield, return the declared type |
| of the bitfield. Otherwise, return NULL_TREE. */ |
| |
| tree |
| is_bitfield_expr_with_lowered_type (const_tree exp) |
| { |
| switch (TREE_CODE (exp)) |
| { |
| case COND_EXPR: |
| if (!is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp, 1) |
| ? TREE_OPERAND (exp, 1) |
| : TREE_OPERAND (exp, 0))) |
| return NULL_TREE; |
| return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp, 2)); |
| |
| case COMPOUND_EXPR: |
| return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp, 1)); |
| |
| case MODIFY_EXPR: |
| case SAVE_EXPR: |
| return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp, 0)); |
| |
| case COMPONENT_REF: |
| { |
| tree field; |
| |
| field = TREE_OPERAND (exp, 1); |
| if (TREE_CODE (field) != FIELD_DECL || !DECL_BIT_FIELD_TYPE (field)) |
| return NULL_TREE; |
| if (same_type_ignoring_top_level_qualifiers_p |
| (TREE_TYPE (exp), DECL_BIT_FIELD_TYPE (field))) |
| return NULL_TREE; |
| return DECL_BIT_FIELD_TYPE (field); |
| } |
| |
| CASE_CONVERT: |
| if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (exp, 0))) |
| == TYPE_MAIN_VARIANT (TREE_TYPE (exp))) |
| return is_bitfield_expr_with_lowered_type (TREE_OPERAND (exp, 0)); |
| /* Fallthrough. */ |
| |
| default: |
| return NULL_TREE; |
| } |
| } |
| |
| /* Like is_bitfield_with_lowered_type, except that if EXP is not a |
| bitfield with a lowered type, the type of EXP is returned, rather |
| than NULL_TREE. */ |
| |
| tree |
| unlowered_expr_type (const_tree exp) |
| { |
| tree type; |
| tree etype = TREE_TYPE (exp); |
| |
| type = is_bitfield_expr_with_lowered_type (exp); |
| if (type) |
| type = cp_build_qualified_type (type, cp_type_quals (etype)); |
| else |
| type = etype; |
| |
| return type; |
| } |
| |
| /* Perform the conversions in [expr] that apply when an lvalue appears |
| in an rvalue context: the lvalue-to-rvalue, array-to-pointer, and |
| function-to-pointer conversions. In addition, manifest constants |
| are replaced by their values, and bitfield references are converted |
| to their declared types. Note that this function does not perform the |
| lvalue-to-rvalue conversion for class types. If you need that conversion |
| to for class types, then you probably need to use force_rvalue. |
| |
| Although the returned value is being used as an rvalue, this |
| function does not wrap the returned expression in a |
| NON_LVALUE_EXPR; the caller is expected to be mindful of the fact |
| that the return value is no longer an lvalue. */ |
| |
| tree |
| decay_conversion (tree exp, tsubst_flags_t complain) |
| { |
| tree type; |
| enum tree_code code; |
| location_t loc = EXPR_LOC_OR_HERE (exp); |
| |
| type = TREE_TYPE (exp); |
| if (type == error_mark_node) |
| return error_mark_node; |
| |
| exp = mark_rvalue_use (exp); |
| |
| exp = resolve_nondeduced_context (exp); |
| if (type_unknown_p (exp)) |
| { |
| if (complain & tf_error) |
| cxx_incomplete_type_error (exp, TREE_TYPE (exp)); |
| return error_mark_node; |
| } |
| |
| code = TREE_CODE (type); |
| |
| /* For an array decl decay_conversion should not try to return its |
| initializer. */ |
| if (code != ARRAY_TYPE) |
| { |
| /* FIXME remove? at least need to remember that this isn't really a |
| constant expression if EXP isn't decl_constant_var_p, like with |
| C_MAYBE_CONST_EXPR. */ |
| exp = decl_constant_value_safe (exp); |
| if (error_operand_p (exp)) |
| return error_mark_node; |
| } |
| |
| if (NULLPTR_TYPE_P (type) && !TREE_SIDE_EFFECTS (exp)) |
| return nullptr_node; |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
| Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */ |
| if (code == VOID_TYPE) |
| { |
| if (complain & tf_error) |
| error_at (loc, "void value not ignored as it ought to be"); |
| return error_mark_node; |
| } |
| if (invalid_nonstatic_memfn_p (exp, complain)) |
| return error_mark_node; |
| if (code == FUNCTION_TYPE || is_overloaded_fn (exp)) |
| return cp_build_addr_expr (exp, complain); |
| if (code == ARRAY_TYPE) |
| { |
| tree adr; |
| tree ptrtype; |
| |
| if (TREE_CODE (exp) == INDIRECT_REF) |
| return build_nop (build_pointer_type (TREE_TYPE (type)), |
| TREE_OPERAND (exp, 0)); |
| |
| if (TREE_CODE (exp) == COMPOUND_EXPR) |
| { |
| tree op1 = decay_conversion (TREE_OPERAND (exp, 1), complain); |
| if (op1 == error_mark_node) |
| return error_mark_node; |
| return build2 (COMPOUND_EXPR, TREE_TYPE (op1), |
| TREE_OPERAND (exp, 0), op1); |
| } |
| |
| if (!lvalue_p (exp) |
| && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) |
| { |
| if (complain & tf_error) |
| error_at (loc, "invalid use of non-lvalue array"); |
| return error_mark_node; |
| } |
| |
| /* Don't let an array compound literal decay to a pointer. It can |
| still be used to initialize an array or bind to a reference. */ |
| if (TREE_CODE (exp) == TARGET_EXPR) |
| { |
| if (complain & tf_error) |
| error_at (loc, "taking address of temporary array"); |
| return error_mark_node; |
| } |
| |
| ptrtype = build_pointer_type (TREE_TYPE (type)); |
| |
| if (TREE_CODE (exp) == VAR_DECL) |
| { |
| if (!cxx_mark_addressable (exp)) |
| return error_mark_node; |
| adr = build_nop (ptrtype, build_address (exp)); |
| return adr; |
| } |
| /* This way is better for a COMPONENT_REF since it can |
| simplify the offset for a component. */ |
| adr = cp_build_addr_expr (exp, complain); |
| return cp_convert (ptrtype, adr, complain); |
| } |
| |
| /* If a bitfield is used in a context where integral promotion |
| applies, then the caller is expected to have used |
| default_conversion. That function promotes bitfields correctly |
| before calling this function. At this point, if we have a |
| bitfield referenced, we may assume that is not subject to |
| promotion, and that, therefore, the type of the resulting rvalue |
| is the declared type of the bitfield. */ |
| exp = convert_bitfield_to_declared_type (exp); |
| |
| /* We do not call rvalue() here because we do not want to wrap EXP |
| in a NON_LVALUE_EXPR. */ |
| |
| /* [basic.lval] |
| |
| Non-class rvalues always have cv-unqualified types. */ |
| type = TREE_TYPE (exp); |
| if (!CLASS_TYPE_P (type) && cv_qualified_p (type)) |
| exp = build_nop (cv_unqualified (type), exp); |
| |
| return exp; |
| } |
| |
| /* Perform preparatory conversions, as part of the "usual arithmetic |
| conversions". In particular, as per [expr]: |
| |
| Whenever an lvalue expression appears as an operand of an |
| operator that expects the rvalue for that operand, the |
| lvalue-to-rvalue, array-to-pointer, or function-to-pointer |
| standard conversions are applied to convert the expression to an |
| rvalue. |
| |
| In addition, we perform integral promotions here, as those are |
| applied to both operands to a binary operator before determining |
| what additional conversions should apply. */ |
| |
| static tree |
| cp_default_conversion (tree exp, tsubst_flags_t complain) |
| { |
| /* Check for target-specific promotions. */ |
| tree promoted_type = targetm.promoted_type (TREE_TYPE (exp)); |
| if (promoted_type) |
| exp = cp_convert (promoted_type, exp, complain); |
| /* Perform the integral promotions first so that bitfield |
| expressions (which may promote to "int", even if the bitfield is |
| declared "unsigned") are promoted correctly. */ |
| else if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (exp))) |
| exp = cp_perform_integral_promotions (exp, complain); |
| /* Perform the other conversions. */ |
| exp = decay_conversion (exp, complain); |
| |
| return exp; |
| } |
| |
| /* C version. */ |
| |
| tree |
| default_conversion (tree exp) |
| { |
| return cp_default_conversion (exp, tf_warning_or_error); |
| } |
| |
| /* EXPR is an expression with an integral or enumeration type. |
| Perform the integral promotions in [conv.prom], and return the |
| converted value. */ |
| |
| tree |
| cp_perform_integral_promotions (tree expr, tsubst_flags_t complain) |
| { |
| tree type; |
| tree promoted_type; |
| |
| expr = mark_rvalue_use (expr); |
| |
| /* [conv.prom] |
| |
| If the bitfield has an enumerated type, it is treated as any |
| other value of that type for promotion purposes. */ |
| type = is_bitfield_expr_with_lowered_type (expr); |
| if (!type || TREE_CODE (type) != ENUMERAL_TYPE) |
| type = TREE_TYPE (expr); |
| gcc_assert (INTEGRAL_OR_ENUMERATION_TYPE_P (type)); |
| /* Scoped enums don't promote. */ |
| if (SCOPED_ENUM_P (type)) |
| return expr; |
| promoted_type = type_promotes_to (type); |
| if (type != promoted_type) |
| expr = cp_convert (promoted_type, expr, complain); |
| return expr; |
| } |
| |
| /* C version. */ |
| |
| tree |
| perform_integral_promotions (tree expr) |
| { |
| return cp_perform_integral_promotions (expr, tf_warning_or_error); |
| } |
| |
| /* Returns nonzero iff exp is a STRING_CST or the result of applying |
| decay_conversion to one. */ |
| |
| int |
| string_conv_p (const_tree totype, const_tree exp, int warn) |
| { |
| tree t; |
| |
| if (TREE_CODE (totype) != POINTER_TYPE) |
| return 0; |
| |
| t = TREE_TYPE (totype); |
| if (!same_type_p (t, char_type_node) |
| && !same_type_p (t, char16_type_node) |
| && !same_type_p (t, char32_type_node) |
| && !same_type_p (t, wchar_type_node)) |
| return 0; |
| |
| if (TREE_CODE (exp) == STRING_CST) |
| { |
| /* Make sure that we don't try to convert between char and wide chars. */ |
| if (!same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (exp))), t)) |
| return 0; |
| } |
| else |
| { |
| /* Is this a string constant which has decayed to 'const char *'? */ |
| t = build_pointer_type (cp_build_qualified_type (t, TYPE_QUAL_CONST)); |
| if (!same_type_p (TREE_TYPE (exp), t)) |
| return 0; |
| STRIP_NOPS (exp); |
| if (TREE_CODE (exp) != ADDR_EXPR |
| || TREE_CODE (TREE_OPERAND (exp, 0)) != STRING_CST) |
| return 0; |
| } |
| |
| /* This warning is not very useful, as it complains about printf. */ |
| if (warn) |
| warning (OPT_Wwrite_strings, |
| "deprecated conversion from string constant to %qT", |
| totype); |
| |
| return 1; |
| } |
| |
| /* Given a COND_EXPR, MIN_EXPR, or MAX_EXPR in T, return it in a form that we |
| can, for example, use as an lvalue. This code used to be in |
| unary_complex_lvalue, but we needed it to deal with `a = (d == c) ? b : c' |
| expressions, where we're dealing with aggregates. But now it's again only |
| called from unary_complex_lvalue. The case (in particular) that led to |
| this was with CODE == ADDR_EXPR, since it's not an lvalue when we'd |
| get it there. */ |
| |
| static tree |
| rationalize_conditional_expr (enum tree_code code, tree t, |
| tsubst_flags_t complain) |
| { |
| /* For MIN_EXPR or MAX_EXPR, fold-const.c has arranged things so that |
| the first operand is always the one to be used if both operands |
| are equal, so we know what conditional expression this used to be. */ |
| if (TREE_CODE (t) == MIN_EXPR || TREE_CODE (t) == MAX_EXPR) |
| { |
| tree op0 = TREE_OPERAND (t, 0); |
| tree op1 = TREE_OPERAND (t, 1); |
| |
| /* The following code is incorrect if either operand side-effects. */ |
| gcc_assert (!TREE_SIDE_EFFECTS (op0) |
| && !TREE_SIDE_EFFECTS (op1)); |
| return |
| build_conditional_expr (build_x_binary_op (input_location, |
| (TREE_CODE (t) == MIN_EXPR |
| ? LE_EXPR : GE_EXPR), |
| op0, TREE_CODE (op0), |
| op1, TREE_CODE (op1), |
| /*overload=*/NULL, |
| complain), |
| cp_build_unary_op (code, op0, 0, complain), |
| cp_build_unary_op (code, op1, 0, complain), |
| complain); |
| } |
| |
| return |
| build_conditional_expr (TREE_OPERAND (t, 0), |
| cp_build_unary_op (code, TREE_OPERAND (t, 1), 0, |
| complain), |
| cp_build_unary_op (code, TREE_OPERAND (t, 2), 0, |
| complain), |
| complain); |
| } |
| |
| /* Given the TYPE of an anonymous union field inside T, return the |
| FIELD_DECL for the field. If not found return NULL_TREE. Because |
| anonymous unions can nest, we must also search all anonymous unions |
| that are directly reachable. */ |
| |
| tree |
| lookup_anon_field (tree t, tree type) |
| { |
| tree field; |
| |
| for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field)) |
| { |
| if (TREE_STATIC (field)) |
| continue; |
| if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field)) |
| continue; |
| |
| /* If we find it directly, return the field. */ |
| if (DECL_NAME (field) == NULL_TREE |
| && type == TYPE_MAIN_VARIANT (TREE_TYPE (field))) |
| { |
| return field; |
| } |
| |
| /* Otherwise, it could be nested, search harder. */ |
| if (DECL_NAME (field) == NULL_TREE |
| && ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
| { |
| tree subfield = lookup_anon_field (TREE_TYPE (field), type); |
| if (subfield) |
| return subfield; |
| } |
| } |
| return NULL_TREE; |
| } |
| |
| /* Build an expression representing OBJECT.MEMBER. OBJECT is an |
| expression; MEMBER is a DECL or baselink. If ACCESS_PATH is |
| non-NULL, it indicates the path to the base used to name MEMBER. |
| If PRESERVE_REFERENCE is true, the expression returned will have |
| REFERENCE_TYPE if the MEMBER does. Otherwise, the expression |
| returned will have the type referred to by the reference. |
| |
| This function does not perform access control; that is either done |
| earlier by the parser when the name of MEMBER is resolved to MEMBER |
| itself, or later when overload resolution selects one of the |
| functions indicated by MEMBER. */ |
| |
| tree |
| build_class_member_access_expr (tree object, tree member, |
| tree access_path, bool preserve_reference, |
| tsubst_flags_t complain) |
| { |
| tree object_type; |
| tree member_scope; |
| tree result = NULL_TREE; |
| tree using_decl = NULL_TREE; |
| |
| if (error_operand_p (object) || error_operand_p (member)) |
| return error_mark_node; |
| |
| gcc_assert (DECL_P (member) || BASELINK_P (member)); |
| |
| /* [expr.ref] |
| |
| The type of the first expression shall be "class object" (of a |
| complete type). */ |
| object_type = TREE_TYPE (object); |
| if (!currently_open_class (object_type) |
| && !complete_type_or_maybe_complain (object_type, object, complain)) |
| return error_mark_node; |
| if (!CLASS_TYPE_P (object_type)) |
| { |
| if (complain & tf_error) |
| { |
| if (POINTER_TYPE_P (object_type) |
| && CLASS_TYPE_P (TREE_TYPE (object_type))) |
| error ("request for member %qD in %qE, which is of pointer " |
| "type %qT (maybe you meant to use %<->%> ?)", |
| member, object, object_type); |
| else |
| error ("request for member %qD in %qE, which is of non-class " |
| "type %qT", member, object, object_type); |
| } |
| return error_mark_node; |
| } |
| |
| /* The standard does not seem to actually say that MEMBER must be a |
| member of OBJECT_TYPE. However, that is clearly what is |
| intended. */ |
| if (DECL_P (member)) |
| { |
| member_scope = DECL_CLASS_CONTEXT (member); |
| mark_used (member); |
| if (TREE_DEPRECATED (member)) |
| warn_deprecated_use (member, NULL_TREE); |
| } |
| else |
| member_scope = BINFO_TYPE (BASELINK_ACCESS_BINFO (member)); |
| /* If MEMBER is from an anonymous aggregate, MEMBER_SCOPE will |
| presently be the anonymous union. Go outwards until we find a |
| type related to OBJECT_TYPE. */ |
| while ((ANON_AGGR_TYPE_P (member_scope) || UNSCOPED_ENUM_P (member_scope)) |
| && !same_type_ignoring_top_level_qualifiers_p (member_scope, |
| object_type)) |
| member_scope = TYPE_CONTEXT (member_scope); |
| if (!member_scope || !DERIVED_FROM_P (member_scope, object_type)) |
| { |
| if (complain & tf_error) |
| { |
| if (TREE_CODE (member) == FIELD_DECL) |
| error ("invalid use of nonstatic data member %qE", member); |
| else |
| error ("%qD is not a member of %qT", member, object_type); |
| } |
| return error_mark_node; |
| } |
| |
| /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x' into |
| `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only an lvalue |
| in the front end; only _DECLs and _REFs are lvalues in the back end. */ |
| { |
| tree temp = unary_complex_lvalue (ADDR_EXPR, object); |
| if (temp) |
| object = cp_build_indirect_ref (temp, RO_NULL, complain); |
| } |
| |
| /* In [expr.ref], there is an explicit list of the valid choices for |
| MEMBER. We check for each of those cases here. */ |
| if (TREE_CODE (member) == VAR_DECL) |
| { |
| /* A static data member. */ |
| result = member; |
| mark_exp_read (object); |
| /* If OBJECT has side-effects, they are supposed to occur. */ |
| if (TREE_SIDE_EFFECTS (object)) |
| result = build2 (COMPOUND_EXPR, TREE_TYPE (result), object, result); |
| } |
| else if (TREE_CODE (member) == FIELD_DECL) |
| { |
| /* A non-static data member. */ |
| bool null_object_p; |
| int type_quals; |
| tree member_type; |
| |
| null_object_p = (TREE_CODE (object) == INDIRECT_REF |
| && integer_zerop (TREE_OPERAND (object, 0))); |
| |
| /* Convert OBJECT to the type of MEMBER. */ |
| if (!same_type_p (TYPE_MAIN_VARIANT (object_type), |
| TYPE_MAIN_VARIANT (member_scope))) |
| { |
| tree binfo; |
| base_kind kind; |
| |
| binfo = lookup_base (access_path ? access_path : object_type, |
| member_scope, ba_unique, &kind, complain); |
| if (binfo == error_mark_node) |
| return error_mark_node; |
| |
| /* It is invalid to try to get to a virtual base of a |
| NULL object. The most common cause is invalid use of |
| offsetof macro. */ |
| if (null_object_p && kind == bk_via_virtual) |
| { |
| if (complain & tf_error) |
| { |
| error ("invalid access to non-static data member %qD of " |
| "NULL object", |
| member); |
| error ("(perhaps the %<offsetof%> macro was used incorrectly)"); |
| } |
| return error_mark_node; |
| } |
| |
| /* Convert to the base. */ |
| object = build_base_path (PLUS_EXPR, object, binfo, |
| /*nonnull=*/1, complain); |
| /* If we found the base successfully then we should be able |
| to convert to it successfully. */ |
| gcc_assert (object != error_mark_node); |
| } |
| |
| /* Complain about other invalid uses of offsetof, even though they will |
| give the right answer. Note that we complain whether or not they |
| actually used the offsetof macro, since there's no way to know at this |
| point. So we just give a warning, instead of a pedwarn. */ |
| /* Do not produce this warning for base class field references, because |
| we know for a fact that didn't come from offsetof. This does occur |
| in various testsuite cases where a null object is passed where a |
| vtable access is required. */ |
| if (null_object_p && warn_invalid_offsetof |
| && CLASSTYPE_NON_STD_LAYOUT (object_type) |
| && !DECL_FIELD_IS_BASE (member) |
| && cp_unevaluated_operand == 0 |
| && (complain & tf_warning)) |
| { |
| warning (OPT_Winvalid_offsetof, |
| "invalid access to non-static data member %qD " |
| " of NULL object", member); |
| warning (OPT_Winvalid_offsetof, |
| "(perhaps the %<offsetof%> macro was used incorrectly)"); |
| } |
| |
| /* If MEMBER is from an anonymous aggregate, we have converted |
| OBJECT so that it refers to the class containing the |
| anonymous union. Generate a reference to the anonymous union |
| itself, and recur to find MEMBER. */ |
| if (ANON_AGGR_TYPE_P (DECL_CONTEXT (member)) |
| /* When this code is called from build_field_call, the |
| object already has the type of the anonymous union. |
| That is because the COMPONENT_REF was already |
| constructed, and was then disassembled before calling |
| build_field_call. After the function-call code is |
| cleaned up, this waste can be eliminated. */ |
| && (!same_type_ignoring_top_level_qualifiers_p |
| (TREE_TYPE (object), DECL_CONTEXT (member)))) |
| { |
| tree anonymous_union; |
| |
| anonymous_union = lookup_anon_field (TREE_TYPE (object), |
| DECL_CONTEXT (member)); |
| object = build_class_member_access_expr (object, |
| anonymous_union, |
| /*access_path=*/NULL_TREE, |
| preserve_reference, |
| complain); |
| } |
| |
| /* Compute the type of the field, as described in [expr.ref]. */ |
| type_quals = TYPE_UNQUALIFIED; |
| member_type = TREE_TYPE (member); |
| if (TREE_CODE (member_type) != REFERENCE_TYPE) |
| { |
| type_quals = (cp_type_quals (member_type) |
| | cp_type_quals (object_type)); |
| |
| /* A field is const (volatile) if the enclosing object, or the |
| field itself, is const (volatile). But, a mutable field is |
| not const, even within a const object. */ |
| if (DECL_MUTABLE_P (member)) |
| type_quals &= ~TYPE_QUAL_CONST; |
| member_type = cp_build_qualified_type (member_type, type_quals); |
| } |
| |
| result = build3 (COMPONENT_REF, member_type, object, member, |
| NULL_TREE); |
| result = fold_if_not_in_template (result); |
| |
| /* Mark the expression const or volatile, as appropriate. Even |
| though we've dealt with the type above, we still have to mark the |
| expression itself. */ |
| if (type_quals & TYPE_QUAL_CONST) |
| TREE_READONLY (result) = 1; |
| if (type_quals & TYPE_QUAL_VOLATILE) |
| TREE_THIS_VOLATILE (result) = 1; |
| } |
| else if (BASELINK_P (member)) |
| { |
| /* The member is a (possibly overloaded) member function. */ |
| tree functions; |
| tree type; |
| |
| /* If the MEMBER is exactly one static member function, then we |
| know the type of the expression. Otherwise, we must wait |
| until overload resolution has been performed. */ |
| functions = BASELINK_FUNCTIONS (member); |
| if (TREE_CODE (functions) == FUNCTION_DECL |
| && DECL_STATIC_FUNCTION_P (functions)) |
| type = TREE_TYPE (functions); |
| else |
| type = unknown_type_node; |
| /* Note that we do not convert OBJECT to the BASELINK_BINFO |
| base. That will happen when the function is called. */ |
| result = build3 (COMPONENT_REF, type, object, member, NULL_TREE); |
| } |
| else if (TREE_CODE (member) == CONST_DECL) |
| { |
| /* The member is an enumerator. */ |
| result = member; |
| /* If OBJECT has side-effects, they are supposed to occur. */ |
| if (TREE_SIDE_EFFECTS (object)) |
| result = build2 (COMPOUND_EXPR, TREE_TYPE (result), |
| object, result); |
| } |
| else if ((using_decl = strip_using_decl (member)) != member) |
| result = build_class_member_access_expr (object, |
| using_decl, |
| access_path, preserve_reference, |
| complain); |
| else |
| { |
| if (complain & tf_error) |
| error ("invalid use of %qD", member); |
| return error_mark_node; |
| } |
| |
| if (!preserve_reference) |
| /* [expr.ref] |
| |
| If E2 is declared to have type "reference to T", then ... the |
| type of E1.E2 is T. */ |
| result = convert_from_reference (result); |
| |
| return result; |
| } |
| |
| /* Return the destructor denoted by OBJECT.SCOPE::DTOR_NAME, or, if |
| SCOPE is NULL, by OBJECT.DTOR_NAME, where DTOR_NAME is ~type. */ |
| |
| static tree |
| lookup_destructor (tree object, tree scope, tree dtor_name) |
| { |
| tree object_type = TREE_TYPE (object); |
| tree dtor_type = TREE_OPERAND (dtor_name, 0); |
| tree expr; |
| |
| if (scope && !check_dtor_name (scope, dtor_type)) |
| { |
| error ("qualified type %qT does not match destructor name ~%qT", |
| scope, dtor_type); |
| return error_mark_node; |
| } |
| if (TREE_CODE (dtor_type) == IDENTIFIER_NODE) |
| { |
| /* In a template, names we can't find a match for are still accepted |
| destructor names, and we check them here. */ |
| if (check_dtor_name (object_type, dtor_type)) |
| dtor_type = object_type; |
| else |
| { |
| error ("object type %qT does not match destructor name ~%qT", |
| object_type, dtor_type); |
| return error_mark_node; |
| } |
| |
| } |
| else if (!DERIVED_FROM_P (dtor_type, TYPE_MAIN_VARIANT (object_type))) |
| { |
| error ("the type being destroyed is %qT, but the destructor refers to %qT", |
| TYPE_MAIN_VARIANT (object_type), dtor_type); |
| return error_mark_node; |
| } |
| expr = lookup_member (dtor_type, complete_dtor_identifier, |
| /*protect=*/1, /*want_type=*/false, |
| tf_warning_or_error); |
| expr = (adjust_result_of_qualified_name_lookup |
| (expr, dtor_type, object_type)); |
| if (scope == NULL_TREE) |
| /* We need to call adjust_result_of_qualified_name_lookup in case the |
| destructor names a base class, but we unset BASELINK_QUALIFIED_P so |
| that we still get virtual function binding. */ |
| BASELINK_QUALIFIED_P (expr) = false; |
| return expr; |
| } |
| |
| /* An expression of the form "A::template B" has been resolved to |
| DECL. Issue a diagnostic if B is not a template or template |
| specialization. */ |
| |
| void |
| check_template_keyword (tree decl) |
| { |
| /* The standard says: |
| |
| [temp.names] |
| |
| If a name prefixed by the keyword template is not a member |
| template, the program is ill-formed. |
| |
| DR 228 removed the restriction that the template be a member |
| template. |
| |
| DR 96, if accepted would add the further restriction that explicit |
| template arguments must be provided if the template keyword is |
| used, but, as of 2005-10-16, that DR is still in "drafting". If |
| this DR is accepted, then the semantic checks here can be |
| simplified, as the entity named must in fact be a template |
| specialization, rather than, as at present, a set of overloaded |
| functions containing at least one template function. */ |
| if (TREE_CODE (decl) != TEMPLATE_DECL |
| && TREE_CODE (decl) != TEMPLATE_ID_EXPR) |
| { |
| if (!is_overloaded_fn (decl)) |
| permerror (input_location, "%qD is not a template", decl); |
| else |
| { |
| tree fns; |
| fns = decl; |
| if (BASELINK_P (fns)) |
| fns = BASELINK_FUNCTIONS (fns); |
| while (fns) |
| { |
| tree fn = OVL_CURRENT (fns); |
| if (TREE_CODE (fn) == TEMPLATE_DECL |
| || TREE_CODE (fn) == TEMPLATE_ID_EXPR) |
| break; |
| if (TREE_CODE (fn) == FUNCTION_DECL |
| && DECL_USE_TEMPLATE (fn) |
| && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (fn))) |
| break; |
| fns = OVL_NEXT (fns); |
| } |
| if (!fns) |
| permerror (input_location, "%qD is not a template", decl); |
| } |
| } |
| } |
| |
| /* This function is called by the parser to process a class member |
| access expression of the form OBJECT.NAME. NAME is a node used by |
| the parser to represent a name; it is not yet a DECL. It may, |
| however, be a BASELINK where the BASELINK_FUNCTIONS is a |
| TEMPLATE_ID_EXPR. Templates must be looked up by the parser, and |
| there is no reason to do the lookup twice, so the parser keeps the |
| BASELINK. TEMPLATE_P is true iff NAME was explicitly declared to |
| be a template via the use of the "A::template B" syntax. */ |
| |
| tree |
| finish_class_member_access_expr (tree object, tree name, bool template_p, |
| tsubst_flags_t complain) |
| { |
| tree expr; |
| tree object_type; |
| tree member; |
| tree access_path = NULL_TREE; |
| tree orig_object = object; |
| tree orig_name = name; |
| |
| if (object == error_mark_node || name == error_mark_node) |
| return error_mark_node; |
| |
| /* If OBJECT is an ObjC class instance, we must obey ObjC access rules. */ |
| if (!objc_is_public (object, name)) |
| return error_mark_node; |
| |
| object_type = TREE_TYPE (object); |
| |
| if (processing_template_decl) |
| { |
| if (/* If OBJECT_TYPE is dependent, so is OBJECT.NAME. */ |
| dependent_type_p (object_type) |
| /* If NAME is just an IDENTIFIER_NODE, then the expression |
| is dependent. */ |
| || TREE_CODE (object) == IDENTIFIER_NODE |
| /* If NAME is "f<args>", where either 'f' or 'args' is |
| dependent, then the expression is dependent. */ |
| || (TREE_CODE (name) == TEMPLATE_ID_EXPR |
| && dependent_template_id_p (TREE_OPERAND (name, 0), |
| TREE_OPERAND (name, 1))) |
| /* If NAME is "T::X" where "T" is dependent, then the |
| expression is dependent. */ |
| || (TREE_CODE (name) == SCOPE_REF |
| && TYPE_P (TREE_OPERAND (name, 0)) |
| && dependent_type_p (TREE_OPERAND (name, 0)))) |
| return build_min_nt_loc (UNKNOWN_LOCATION, COMPONENT_REF, |
| object, name, NULL_TREE); |
| object = build_non_dependent_expr (object); |
| } |
| else if (c_dialect_objc () |
| && TREE_CODE (name) == IDENTIFIER_NODE |
| && (expr = objc_maybe_build_component_ref (object, name))) |
| return expr; |
| |
| /* [expr.ref] |
| |
| The type of the first expression shall be "class object" (of a |
| complete type). */ |
| if (!currently_open_class (object_type) |
| && !complete_type_or_maybe_complain (object_type, object, complain)) |
| return error_mark_node; |
| if (!CLASS_TYPE_P (object_type)) |
| { |
| if (complain & tf_error) |
| { |
| if (POINTER_TYPE_P (object_type) |
| && CLASS_TYPE_P (TREE_TYPE (object_type))) |
| error ("request for member %qD in %qE, which is of pointer " |
| "type %qT (maybe you meant to use %<->%> ?)", |
| name, object, object_type); |
| else |
| error ("request for member %qD in %qE, which is of non-class " |
| "type %qT", name, object, object_type); |
| } |
| return error_mark_node; |
| } |
| |
| if (BASELINK_P (name)) |
| /* A member function that has already been looked up. */ |
| member = name; |
| else |
| { |
| bool is_template_id = false; |
| tree template_args = NULL_TREE; |
| tree scope; |
| |
| if (TREE_CODE (name) == TEMPLATE_ID_EXPR) |
| { |
| is_template_id = true; |
| template_args = TREE_OPERAND (name, 1); |
| name = TREE_OPERAND (name, 0); |
| |
| if (TREE_CODE (name) == OVERLOAD) |
| name = DECL_NAME (get_first_fn (name)); |
| else if (DECL_P (name)) |
| name = DECL_NAME (name); |
| } |
| |
| if (TREE_CODE (name) == SCOPE_REF) |
| { |
| /* A qualified name. The qualifying class or namespace `S' |
| has already been looked up; it is either a TYPE or a |
| NAMESPACE_DECL. */ |
| scope = TREE_OPERAND (name, 0); |
| name = TREE_OPERAND (name, 1); |
| |
| /* If SCOPE is a namespace, then the qualified name does not |
| name a member of OBJECT_TYPE. */ |
| if (TREE_CODE (scope) == NAMESPACE_DECL) |
| { |
| if (complain & tf_error) |
| error ("%<%D::%D%> is not a member of %qT", |
| scope, name, object_type); |
| return error_mark_node; |
| } |
| |
| if (TREE_CODE (scope) == ENUMERAL_TYPE) |
| { |
| /* Looking up a member enumerator (c++/56793). */ |
| if (!TYPE_CLASS_SCOPE_P (scope) |
| || !DERIVED_FROM_P (TYPE_CONTEXT (scope), object_type)) |
| { |
| if (complain & tf_error) |
| error ("%<%D::%D%> is not a member of %qT", |
| scope, name, object_type); |
| return error_mark_node; |
| } |
| tree val = lookup_enumerator (scope, name); |
| if (TREE_SIDE_EFFECTS (object)) |
| val = build2 (COMPOUND_EXPR, TREE_TYPE (val), object, val); |
| return val; |
| } |
| |
| gcc_assert (CLASS_TYPE_P (scope)); |
| gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE |
| || TREE_CODE (name) == BIT_NOT_EXPR); |
| |
| if (constructor_name_p (name, scope)) |
| { |
| if (complain & tf_error) |
| error ("cannot call constructor %<%T::%D%> directly", |
| scope, name); |
| return error_mark_node; |
| } |
| |
| /* Find the base of OBJECT_TYPE corresponding to SCOPE. */ |
| access_path = lookup_base (object_type, scope, ba_check, |
| NULL, complain); |
| if (access_path == error_mark_node) |
| return error_mark_node; |
| if (!access_path) |
| { |
| if (complain & tf_error) |
| error ("%qT is not a base of %qT", scope, object_type); |
| return error_mark_node; |
| } |
| } |
| else |
| { |
| scope = NULL_TREE; |
| access_path = object_type; |
| } |
| |
| if (TREE_CODE (name) == BIT_NOT_EXPR) |
| member = lookup_destructor (object, scope, name); |
| else |
| { |
| /* Look up the member. */ |
| member = lookup_member (access_path, name, /*protect=*/1, |
| /*want_type=*/false, complain); |
| if (member == NULL_TREE) |
| { |
| if (complain & tf_error) |
| error ("%qD has no member named %qE", |
| TREE_CODE (access_path) == TREE_BINFO |
| ? TREE_TYPE (access_path) : object_type, name); |
| return error_mark_node; |
| } |
| if (member == error_mark_node) |
| return error_mark_node; |
| } |
| |
| if (is_template_id) |
| { |
| tree templ = member; |
| |
| if (BASELINK_P (templ)) |
| templ = lookup_template_function (templ, template_args); |
| else |
| { |
| if (complain & tf_error) |
| error ("%qD is not a member template function", name); |
| return error_mark_node; |
| } |
| } |
| } |
| |
| if (TREE_DEPRECATED (member)) |
| warn_deprecated_use (member, NULL_TREE); |
| |
| if (template_p) |
| check_template_keyword (member); |
| |
| expr = build_class_member_access_expr (object, member, access_path, |
| /*preserve_reference=*/false, |
| complain); |
| if (processing_template_decl && expr != error_mark_node) |
| { |
| if (BASELINK_P (member)) |
| { |
| if (TREE_CODE (orig_name) == SCOPE_REF) |
| BASELINK_QUALIFIED_P (member) = 1; |
| orig_name = member; |
| } |
| return build_min_non_dep (COMPONENT_REF, expr, |
| orig_object, orig_name, |
| NULL_TREE); |
| } |
| |
| return expr; |
| } |
| |
| /* Return an expression for the MEMBER_NAME field in the internal |
| representation of PTRMEM, a pointer-to-member function. (Each |
| pointer-to-member function type gets its own RECORD_TYPE so it is |
| more convenient to access the fields by name than by FIELD_DECL.) |
| This routine converts the NAME to a FIELD_DECL and then creates the |
| node for the complete expression. */ |
| |
| tree |
| build_ptrmemfunc_access_expr (tree ptrmem, tree member_name) |
| { |
| tree ptrmem_type; |
| tree member; |
| tree member_type; |
| |
| /* This code is a stripped down version of |
| build_class_member_access_expr. It does not work to use that |
| routine directly because it expects the object to be of class |
| type. */ |
| ptrmem_type = TREE_TYPE (ptrmem); |
| gcc_assert (TYPE_PTRMEMFUNC_P (ptrmem_type)); |
| member = lookup_member (ptrmem_type, member_name, /*protect=*/0, |
| /*want_type=*/false, tf_warning_or_error); |
| member_type = cp_build_qualified_type (TREE_TYPE (member), |
| cp_type_quals (ptrmem_type)); |
| return fold_build3_loc (input_location, |
| COMPONENT_REF, member_type, |
| ptrmem, member, NULL_TREE); |
| } |
| |
| /* Given an expression PTR for a pointer, return an expression |
| for the value pointed to. |
| ERRORSTRING is the name of the operator to appear in error messages. |
| |
| This function may need to overload OPERATOR_FNNAME. |
| Must also handle REFERENCE_TYPEs for C++. */ |
| |
| tree |
| build_x_indirect_ref (location_t loc, tree expr, ref_operator errorstring, |
| tsubst_flags_t complain) |
| { |
| tree orig_expr = expr; |
| tree rval; |
| |
| if (processing_template_decl) |
| { |
| /* Retain the type if we know the operand is a pointer. */ |
| if (TREE_TYPE (expr) && POINTER_TYPE_P (TREE_TYPE (expr))) |
| return build_min (INDIRECT_REF, TREE_TYPE (TREE_TYPE (expr)), expr); |
| if (type_dependent_expression_p (expr)) |
| return build_min_nt_loc (loc, INDIRECT_REF, expr); |
| expr = build_non_dependent_expr (expr); |
| } |
| |
| rval = build_new_op (loc, INDIRECT_REF, LOOKUP_NORMAL, expr, |
| NULL_TREE, NULL_TREE, /*overload=*/NULL, complain); |
| if (!rval) |
| rval = cp_build_indirect_ref (expr, errorstring, complain); |
| |
| if (processing_template_decl && rval != error_mark_node) |
| return build_min_non_dep (INDIRECT_REF, rval, orig_expr); |
| else |
| return rval; |
| } |
| |
| /* Helper function called from c-common. */ |
| tree |
| build_indirect_ref (location_t /*loc*/, |
| tree ptr, ref_operator errorstring) |
| { |
| return cp_build_indirect_ref (ptr, errorstring, tf_warning_or_error); |
| } |
| |
| tree |
| cp_build_indirect_ref (tree ptr, ref_operator errorstring, |
| tsubst_flags_t complain) |
| { |
| tree pointer, type; |
| |
| if (ptr == current_class_ptr) |
| return current_class_ref; |
| |
| pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE |
| ? ptr : decay_conversion (ptr, complain)); |
| if (pointer == error_mark_node) |
| return error_mark_node; |
| |
| type = TREE_TYPE (pointer); |
| |
| if (POINTER_TYPE_P (type)) |
| { |
| /* [expr.unary.op] |
| |
| If the type of the expression is "pointer to T," the type |
| of the result is "T." */ |
| tree t = TREE_TYPE (type); |
| |
| if (CONVERT_EXPR_P (ptr) |
| || TREE_CODE (ptr) == VIEW_CONVERT_EXPR) |
| { |
| /* If a warning is issued, mark it to avoid duplicates from |
| the backend. This only needs to be done at |
| warn_strict_aliasing > 2. */ |
| if (warn_strict_aliasing > 2) |
| if (strict_aliasing_warning (TREE_TYPE (TREE_OPERAND (ptr, 0)), |
| type, TREE_OPERAND (ptr, 0))) |
| TREE_NO_WARNING (ptr) = 1; |
| } |
| |
| if (VOID_TYPE_P (t)) |
| { |
| /* A pointer to incomplete type (other than cv void) can be |
| dereferenced [expr.unary.op]/1 */ |
| if (complain & tf_error) |
| error ("%qT is not a pointer-to-object type", type); |
| return error_mark_node; |
| } |
| else if (TREE_CODE (pointer) == ADDR_EXPR |
| && same_type_p (t, TREE_TYPE (TREE_OPERAND (pointer, 0)))) |
| /* The POINTER was something like `&x'. We simplify `*&x' to |
| `x'. */ |
| return TREE_OPERAND (pointer, 0); |
| else |
| { |
| tree ref = build1 (INDIRECT_REF, t, pointer); |
| |
| /* We *must* set TREE_READONLY when dereferencing a pointer to const, |
| so that we get the proper error message if the result is used |
| to assign to. Also, &* is supposed to be a no-op. */ |
| TREE_READONLY (ref) = CP_TYPE_CONST_P (t); |
| TREE_THIS_VOLATILE (ref) = CP_TYPE_VOLATILE_P (t); |
| TREE_SIDE_EFFECTS (ref) |
| = (TREE_THIS_VOLATILE (ref) || TREE_SIDE_EFFECTS (pointer)); |
| return ref; |
| } |
| } |
| else if (!(complain & tf_error)) |
| /* Don't emit any errors; we'll just return ERROR_MARK_NODE later. */ |
| ; |
| /* `pointer' won't be an error_mark_node if we were given a |
| pointer to member, so it's cool to check for this here. */ |
| else if (TYPE_PTRMEM_P (type)) |
| switch (errorstring) |
| { |
| case RO_ARRAY_INDEXING: |
| error ("invalid use of array indexing on pointer to member"); |
| break; |
| case RO_UNARY_STAR: |
| error ("invalid use of unary %<*%> on pointer to member"); |
| break; |
| case RO_IMPLICIT_CONVERSION: |
| error ("invalid use of implicit conversion on pointer to member"); |
| break; |
| case RO_ARROW_STAR: |
| error ("left hand operand of %<->*%> must be a pointer to class, " |
| "but is a pointer to member of type %qT", type); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| else if (pointer != error_mark_node) |
| invalid_indirection_error (input_location, type, errorstring); |
| |
| return error_mark_node; |
| } |
| |
| /* This handles expressions of the form "a[i]", which denotes |
| an array reference. |
| |
| This is logically equivalent in C to *(a+i), but we may do it differently. |
| If A is a variable or a member, we generate a primitive ARRAY_REF. |
| This avoids forcing the array out of registers, and can work on |
| arrays that are not lvalues (for example, members of structures returned |
| by functions). |
| |
| If INDEX is of some user-defined type, it must be converted to |
| integer type. Otherwise, to make a compatible PLUS_EXPR, it |
| will inherit the type of the array, which will be some pointer type. |
| |
| LOC is the location to use in building the array reference. */ |
| |
| tree |
| cp_build_array_ref (location_t loc, tree array, tree idx, |
| tsubst_flags_t complain) |
| { |
| tree ret; |
| |
| if (idx == 0) |
| { |
| if (complain & tf_error) |
| error_at (loc, "subscript missing in array reference"); |
| return error_mark_node; |
| } |
| |
| if (TREE_TYPE (array) == error_mark_node |
| || TREE_TYPE (idx) == error_mark_node) |
| return error_mark_node; |
| |
| /* If ARRAY is a COMPOUND_EXPR or COND_EXPR, move our reference |
| inside it. */ |
| switch (TREE_CODE (array)) |
| { |
| case COMPOUND_EXPR: |
| { |
| tree value = cp_build_array_ref (loc, TREE_OPERAND (array, 1), idx, |
| complain); |
| ret = build2 (COMPOUND_EXPR, TREE_TYPE (value), |
| TREE_OPERAND (array, 0), value); |
| SET_EXPR_LOCATION (ret, loc); |
| return ret; |
| } |
| |
| case COND_EXPR: |
| ret = build_conditional_expr |
| (TREE_OPERAND (array, 0), |
| cp_build_array_ref (loc, TREE_OPERAND (array, 1), idx, |
| complain), |
| cp_build_array_ref (loc, TREE_OPERAND (array, 2), idx, |
| complain), |
| complain); |
| protected_set_expr_location (ret, loc); |
| return ret; |
| |
| default: |
| break; |
| } |
| |
| convert_vector_to_pointer_for_subscript (loc, &array, idx); |
| |
| if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE) |
| { |
| tree rval, type; |
| |
| warn_array_subscript_with_type_char (idx); |
| |
| if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (idx))) |
| { |
| if (complain & tf_error) |
| error_at (loc, "array subscript is not an integer"); |
| return error_mark_node; |
| } |
| |
| /* Apply integral promotions *after* noticing character types. |
| (It is unclear why we do these promotions -- the standard |
| does not say that we should. In fact, the natural thing would |
| seem to be to convert IDX to ptrdiff_t; we're performing |
| pointer arithmetic.) */ |
| idx = cp_perform_integral_promotions (idx, complain); |
| |
| /* An array that is indexed by a non-constant |
| cannot be stored in a register; we must be able to do |
| address arithmetic on its address. |
| Likewise an array of elements of variable size. */ |
| if (TREE_CODE (idx) != INTEGER_CST |
| || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array))) |
| && (TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) |
| != INTEGER_CST))) |
| { |
| if (!cxx_mark_addressable (array)) |
| return error_mark_node; |
| } |
| |
| /* An array that is indexed by a constant value which is not within |
| the array bounds cannot be stored in a register either; because we |
| would get a crash in store_bit_field/extract_bit_field when trying |
| to access a non-existent part of the register. */ |
| if (TREE_CODE (idx) == INTEGER_CST |
| && TYPE_DOMAIN (TREE_TYPE (array)) |
| && ! int_fits_type_p (idx, TYPE_DOMAIN (TREE_TYPE (array)))) |
| { |
| if (!cxx_mark_addressable (array)) |
| return error_mark_node; |
| } |
| |
| if (!lvalue_p (array) && (complain & tf_error)) |
| pedwarn (loc, OPT_Wpedantic, |
| "ISO C++ forbids subscripting non-lvalue array"); |
| |
| /* Note in C++ it is valid to subscript a `register' array, since |
| it is valid to take the address of something with that |
| storage specification. */ |
| if (extra_warnings) |
| { |
| tree foo = array; |
| while (TREE_CODE (foo) == COMPONENT_REF) |
| foo = TREE_OPERAND (foo, 0); |
| if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo) |
| && (complain & tf_warning)) |
| warning_at (loc, OPT_Wextra, |
| "subscripting array declared %<register%>"); |
| } |
| |
| type = TREE_TYPE (TREE_TYPE (array)); |
| rval = build4 (ARRAY_REF, type, array, idx, NULL_TREE, NULL_TREE); |
| /* Array ref is const/volatile if the array elements are |
| or if the array is.. */ |
| TREE_READONLY (rval) |
| |= (CP_TYPE_CONST_P (type) | TREE_READONLY (array)); |
| TREE_SIDE_EFFECTS (rval) |
| |= (CP_TYPE_VOLATILE_P (type) | TREE_SIDE_EFFECTS (array)); |
| TREE_THIS_VOLATILE (rval) |
| |= (CP_TYPE_VOLATILE_P (type) | TREE_THIS_VOLATILE (array)); |
| ret = require_complete_type_sfinae (fold_if_not_in_template (rval), |
| complain); |
| protected_set_expr_location (ret, loc); |
| return ret; |
| } |
| |
| { |
| tree ar = cp_default_conversion (array, complain); |
| tree ind = cp_default_conversion (idx, complain); |
| |
| /* Put the integer in IND to simplify error checking. */ |
| if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) |
| { |
| tree temp = ar; |
| ar = ind; |
| ind = temp; |
| } |
| |
| if (ar == error_mark_node || ind == error_mark_node) |
| return error_mark_node; |
| |
| if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) |
| { |
| if (complain & tf_error) |
| error_at (loc, "subscripted value is neither array nor pointer"); |
| return error_mark_node; |
| } |
| if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) |
| { |
| if (complain & tf_error) |
| error_at (loc, "array subscript is not an integer"); |
| return error_mark_node; |
| } |
| |
| warn_array_subscript_with_type_char (idx); |
| |
| ret = cp_build_indirect_ref (cp_build_binary_op (input_location, |
| PLUS_EXPR, ar, ind, |
| complain), |
| RO_ARRAY_INDEXING, |
| complain); |
| protected_set_expr_location (ret, loc); |
| return ret; |
| } |
| } |
| |
| /* Entry point for Obj-C++. */ |
| |
| tree |
| build_array_ref (location_t loc, tree array, tree idx) |
| { |
| return cp_build_array_ref (loc, array, idx, tf_warning_or_error); |
| } |
| |
| /* Resolve a pointer to member function. INSTANCE is the object |
| instance to use, if the member points to a virtual member. |
| |
| This used to avoid checking for virtual functions if basetype |
| has no virtual functions, according to an earlier ANSI draft. |
| With the final ISO C++ rules, such an optimization is |
| incorrect: A pointer to a derived member can be static_cast |
| to pointer-to-base-member, as long as the dynamic object |
| later has the right member. So now we only do this optimization |
| when we know the dynamic type of the object. */ |
| |
| tree |
| get_member_function_from_ptrfunc (tree *instance_ptrptr, tree function, |
| tsubst_flags_t complain) |
| { |
| if (TREE_CODE (function) == OFFSET_REF) |
| function = TREE_OPERAND (function, 1); |
| |
| if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function))) |
| { |
| tree idx, delta, e1, e2, e3, vtbl; |
| bool nonvirtual; |
| tree fntype = TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function)); |
| tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (fntype)); |
| |
| tree instance_ptr = *instance_ptrptr; |
| tree instance_save_expr = 0; |
| if (instance_ptr == error_mark_node) |
| { |
| if (TREE_CODE (function) == PTRMEM_CST) |
| { |
| /* Extracting the function address from a pmf is only |
| allowed with -Wno-pmf-conversions. It only works for |
| pmf constants. */ |
| e1 = build_addr_func (PTRMEM_CST_MEMBER (function), complain); |
| e1 = convert (fntype, e1); |
| return e1; |
| } |
| else |
| { |
| if (complain & tf_error) |
| error ("object missing in use of %qE", function); |
| return error_mark_node; |
| } |
| } |
| |
| /* True if we know that the dynamic type of the object doesn't have |
| virtual functions, so we can assume the PFN field is a pointer. */ |
| nonvirtual = (COMPLETE_TYPE_P (basetype) |
| && !TYPE_POLYMORPHIC_P (basetype) |
| && resolves_to_fixed_type_p (instance_ptr, 0)); |
| |
| if (TREE_SIDE_EFFECTS (instance_ptr)) |
| instance_ptr = instance_save_expr = save_expr (instance_ptr); |
| |
| if (TREE_SIDE_EFFECTS (function)) |
| function = save_expr (function); |
| |
| /* Start by extracting all the information from the PMF itself. */ |
| e3 = pfn_from_ptrmemfunc (function); |
| delta = delta_from_ptrmemfunc (function); |
| idx = build1 (NOP_EXPR, vtable_index_type, e3); |
| switch (TARGET_PTRMEMFUNC_VBIT_LOCATION) |
| { |
| case ptrmemfunc_vbit_in_pfn: |
| e1 = cp_build_binary_op (input_location, |
| BIT_AND_EXPR, idx, integer_one_node, |
| complain); |
| idx = cp_build_binary_op (input_location, |
| MINUS_EXPR, idx, integer_one_node, |
| complain); |
| if (idx == error_mark_node) |
| return error_mark_node; |
| break; |
| |
| case ptrmemfunc_vbit_in_delta: |
| e1 = cp_build_binary_op (input_location, |
| BIT_AND_EXPR, delta, integer_one_node, |
| complain); |
| delta = cp_build_binary_op (input_location, |
| RSHIFT_EXPR, delta, integer_one_node, |
| complain); |
| if (delta == error_mark_node) |
| return error_mark_node; |
| break; |
| |
| default: |
| gcc_unreachable (); |
| } |
| |
| if (e1 == error_mark_node) |
| return error_mark_node; |
| |
| /* Convert down to the right base before using the instance. A |
| special case is that in a pointer to member of class C, C may |
| be incomplete. In that case, the function will of course be |
| a member of C, and no conversion is required. In fact, |
| lookup_base will fail in that case, because incomplete |
| classes do not have BINFOs. */ |
| if (!same_type_ignoring_top_level_qualifiers_p |
| (basetype, TREE_TYPE (TREE_TYPE (instance_ptr)))) |
| { |
| basetype = lookup_base (TREE_TYPE (TREE_TYPE (instance_ptr)), |
| basetype, ba_check, NULL, complain); |
| instance_ptr = build_base_path (PLUS_EXPR, instance_ptr, basetype, |
| 1, complain); |
| if (instance_ptr == error_mark_node) |
| return error_mark_node; |
| } |
| /* ...and then the delta in the PMF. */ |
| instance_ptr = fold_build_pointer_plus (instance_ptr, delta); |
| |
| /* Hand back the adjusted 'this' argument to our caller. */ |
| *instance_ptrptr = instance_ptr; |
| |
| if (nonvirtual) |
| /* Now just return the pointer. */ |
| return e3; |
| |
| /* Next extract the vtable pointer from the object. */ |
| vtbl = build1 (NOP_EXPR, build_pointer_type (vtbl_ptr_type_node), |
| instance_ptr); |
| vtbl = cp_build_indirect_ref (vtbl, RO_NULL, complain); |
| if (vtbl == error_mark_node) |
| return error_mark_node; |
| |
| /* Finally, extract the function pointer from the vtable. */ |
| e2 = fold_build_pointer_plus_loc (input_location, vtbl, idx); |
| e2 = cp_build_indirect_ref (e2, RO_NULL, complain); |
| if (e2 == error_mark_node) |
| return error_mark_node; |
| TREE_CONSTANT (e2) = 1; |
| |
| /* When using function descriptors, the address of the |
| vtable entry is treated as a function pointer. */ |
| if (TARGET_VTABLE_USES_DESCRIPTORS) |
| e2 = build1 (NOP_EXPR, TREE_TYPE (e2), |
| cp_build_addr_expr (e2, complain)); |
| |
| e2 = fold_convert (TREE_TYPE (e3), e2); |
| e1 = build_conditional_expr (e1, e2, e3, complain); |
| if (e1 == error_mark_node) |
| return error_mark_node; |
| |
| /* Make sure this doesn't get evaluated first inside one of the |
| branches of the COND_EXPR. */ |
| if (instance_save_expr) |
| e1 = build2 (COMPOUND_EXPR, TREE_TYPE (e1), |
| instance_save_expr, e1); |
| |
| function = e1; |
| } |
| return function; |
| } |
| |
| /* Used by the C-common bits. */ |
| tree |
| build_function_call (location_t /*loc*/, |
| tree function, tree params) |
| { |
| return cp_build_function_call (function, params, tf_warning_or_error); |
| } |
| |
| /* Used by the C-common bits. */ |
| tree |
| build_function_call_vec (location_t /*loc*/, |
| tree function, vec<tree, va_gc> *params, |
| vec<tree, va_gc> * /*origtypes*/) |
| { |
| vec<tree, va_gc> *orig_params = params; |
| tree ret = cp_build_function_call_vec (function, ¶ms, |
| tf_warning_or_error); |
| |
| /* cp_build_function_call_vec can reallocate PARAMS by adding |
| default arguments. That should never happen here. Verify |
| that. */ |
| gcc_assert (params == orig_params); |
| |
| return ret; |
| } |
| |
| /* Build a function call using a tree list of arguments. */ |
| |
| tree |
| cp_build_function_call (tree function, tree params, tsubst_flags_t complain) |
| { |
| vec<tree, va_gc> *vec; |
| tree ret; |
| |
| vec = make_tree_vector (); |
| for (; params != NULL_TREE; params = TREE_CHAIN (params)) |
| vec_safe_push (vec, TREE_VALUE (params)); |
| ret = cp_build_function_call_vec (function, &vec, complain); |
| release_tree_vector (vec); |
| return ret; |
| } |
| |
| /* Build a function call using varargs. */ |
| |
| tree |
| cp_build_function_call_nary (tree function, tsubst_flags_t complain, ...) |
| { |
| vec<tree, va_gc> *vec; |
| va_list args; |
| tree ret, t; |
| |
| vec = make_tree_vector (); |
| va_start (args, complain); |
| for (t = va_arg (args, tree); t != NULL_TREE; t = va_arg (args, tree)) |
| vec_safe_push (vec, t); |
| va_end (args); |
| ret = cp_build_function_call_vec (function, &vec, complain); |
| release_tree_vector (vec); |
| return ret; |
| } |
| |
| /* Build a function call using a vector of arguments. PARAMS may be |
| NULL if there are no parameters. This changes the contents of |
| PARAMS. */ |
| |
| tree |
| cp_build_function_call_vec (tree function, vec<tree, va_gc> **params, |
| tsubst_flags_t complain) |
| { |
| tree fntype, fndecl; |
| int is_method; |
| tree original = function; |
| int nargs; |
| tree *argarray; |
| tree parm_types; |
| vec<tree, va_gc> *allocated = NULL; |
| tree ret; |
| |
| /* For Objective-C, convert any calls via a cast to OBJC_TYPE_REF |
| expressions, like those used for ObjC messenger dispatches. */ |
| if (params != NULL && !vec_safe_is_empty (*params)) |
| function = objc_rewrite_function_call (function, (**params)[0]); |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
| Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */ |
| if (TREE_CODE (function) == NOP_EXPR |
| && TREE_TYPE (function) == TREE_TYPE (TREE_OPERAND (function, 0))) |
| function = TREE_OPERAND (function, 0); |
| |
| if (TREE_CODE (function) == FUNCTION_DECL) |
| { |
| mark_used (function); |
| fndecl = function; |
| |
| /* Convert anything with function type to a pointer-to-function. */ |
| if (DECL_MAIN_P (function) && (complain & tf_error)) |
| pedwarn (input_location, OPT_Wpedantic, |
| "ISO C++ forbids calling %<::main%> from within program"); |
| |
| function = build_addr_func (function, complain); |
| } |
| else |
| { |
| fndecl = NULL_TREE; |
| |
| function = build_addr_func (function, complain); |
| } |
| |
| if (function == error_mark_node) |
| return error_mark_node; |
| |
| fntype = TREE_TYPE (function); |
| |
| if (TYPE_PTRMEMFUNC_P (fntype)) |
| { |
| if (complain & tf_error) |
| error ("must use %<.*%> or %<->*%> to call pointer-to-member " |
| "function in %<%E (...)%>, e.g. %<(... ->* %E) (...)%>", |
| original, original); |
| return error_mark_node; |
| } |
| |
| is_method = (TREE_CODE (fntype) == POINTER_TYPE |
| && TREE_CODE (TREE_TYPE (fntype)) == METHOD_TYPE); |
| |
| if (!((TREE_CODE (fntype) == POINTER_TYPE |
| && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE) |
| || is_method |
| || TREE_CODE (function) == TEMPLATE_ID_EXPR)) |
| { |
| if (complain & tf_error) |
| { |
| if (!flag_diagnostics_show_caret) |
| error_at (input_location, |
| "%qE cannot be used as a function", original); |
| else if (DECL_P (original)) |
| error_at (input_location, |
| "%qD cannot be used as a function", original); |
| else |
| error_at (input_location, |
| "expression cannot be used as a function"); |
| } |
| |
| return error_mark_node; |
| } |
| |
| /* fntype now gets the type of function pointed to. */ |
| fntype = TREE_TYPE (fntype); |
| parm_types = TYPE_ARG_TYPES (fntype); |
| |
| if (params == NULL) |
| { |
| allocated = make_tree_vector (); |
| params = &allocated; |
| } |
| |
| nargs = convert_arguments (parm_types, params, fndecl, LOOKUP_NORMAL, |
| complain); |
| if (nargs < 0) |
| return error_mark_node; |
| |
| argarray = (*params)->address (); |
| |
| /* Check for errors in format strings and inappropriately |
| null parameters. */ |
| check_function_arguments (fntype, nargs, argarray); |
| |
| ret = build_cxx_call (function, nargs, argarray, complain); |
| |
| if (allocated != NULL) |
| release_tree_vector (allocated); |
| |
| return ret; |
| } |
| |
| /* Subroutine of convert_arguments. |
| Warn about wrong number of args are genereted. */ |
| |
| static void |
| warn_args_num (location_t loc, tree fndecl, bool too_many_p) |
| { |
| if (fndecl) |
| { |
| if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE) |
| { |
| if (DECL_NAME (fndecl) == NULL_TREE |
| || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl))) |
| error_at (loc, |
| too_many_p |
| ? G_("too many arguments to constructor %q#D") |
| : G_("too few arguments to constructor %q#D"), |
| fndecl); |
| else |
| error_at (loc, |
| too_many_p |
| ? G_("too many arguments to member function %q#D") |
| : G_("too few arguments to member function %q#D"), |
| fndecl); |
| } |
| else |
| error_at (loc, |
| too_many_p |
| ? G_("too many arguments to function %q#D") |
| : G_("too few arguments to function %q#D"), |
| fndecl); |
| inform (DECL_SOURCE_LOCATION (fndecl), |
| "declared here"); |
| } |
| else |
| { |
| if (c_dialect_objc () && objc_message_selector ()) |
| error_at (loc, |
| too_many_p |
| ? G_("too many arguments to method %q#D") |
| : G_("too few arguments to method %q#D"), |
| objc_message_selector ()); |
| else |
| error_at (loc, too_many_p ? G_("too many arguments to function") |
| : G_("too few arguments to function")); |
| } |
| } |
| |
| /* Convert the actual parameter expressions in the list VALUES to the |
| types in the list TYPELIST. The converted expressions are stored |
| back in the VALUES vector. |
| If parmdecls is exhausted, or when an element has NULL as its type, |
| perform the default conversions. |
| |
| NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. |
| |
| This is also where warnings about wrong number of args are generated. |
| |
| Returns the actual number of arguments processed (which might be less |
| than the length of the vector), or -1 on error. |
| |
| In C++, unspecified trailing parameters can be filled in with their |
| default arguments, if such were specified. Do so here. */ |
| |
| static int |
| convert_arguments (tree typelist, vec<tree, va_gc> **values, tree fndecl, |
| int flags, tsubst_flags_t complain) |
| { |
| tree typetail; |
| unsigned int i; |
| |
| /* Argument passing is always copy-initialization. */ |
| flags |= LOOKUP_ONLYCONVERTING; |
| |
| for (i = 0, typetail = typelist; |
| i < vec_safe_length (*values); |
| i++) |
| { |
| tree type = typetail ? TREE_VALUE (typetail) : 0; |
| tree val = (**values)[i]; |
| |
| if (val == error_mark_node || type == error_mark_node) |
| return -1; |
| |
| if (type == void_type_node) |
| { |
| if (complain & tf_error) |
| { |
| warn_args_num (input_location, fndecl, /*too_many_p=*/true); |
| return i; |
| } |
| else |
| return -1; |
| } |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
| Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */ |
| if (TREE_CODE (val) == NOP_EXPR |
| && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)) |
| && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)) |
| val = TREE_OPERAND (val, 0); |
| |
| if (type == 0 || TREE_CODE (type) != REFERENCE_TYPE) |
| { |
| if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE |
| || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE |
| || TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) |
| val = decay_conversion (val, complain); |
| } |
| |
| if (val == error_mark_node) |
| return -1; |
| |
| if (type != 0) |
| { |
| /* Formal parm type is specified by a function prototype. */ |
| tree parmval; |
| |
| if (!COMPLETE_TYPE_P (complete_type (type))) |
| { |
| if (complain & tf_error) |
| { |
| if (fndecl) |
| error ("parameter %P of %qD has incomplete type %qT", |
| i, fndecl, type); |
| else |
| error ("parameter %P has incomplete type %qT", i, type); |
| } |
| parmval = error_mark_node; |
| } |
| else |
| { |
| parmval = convert_for_initialization |
| (NULL_TREE, type, val, flags, |
| ICR_ARGPASS, fndecl, i, complain); |
| parmval = convert_for_arg_passing (type, parmval, complain); |
| } |
| |
| if (parmval == error_mark_node) |
| return -1; |
| |
| (**values)[i] = parmval; |
| } |
| else |
| { |
| if (fndecl && DECL_BUILT_IN (fndecl) |
| && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CONSTANT_P) |
| /* Don't do ellipsis conversion for __built_in_constant_p |
| as this will result in spurious errors for non-trivial |
| types. */ |
| val = require_complete_type_sfinae (val, complain); |
| else |
| val = convert_arg_to_ellipsis (val, complain); |
| |
| (**values)[i] = val; |
| } |
| |
| if (typetail) |
| typetail = TREE_CHAIN (typetail); |
| } |
| |
| if (typetail != 0 && typetail != void_list_node) |
| { |
| /* See if there are default arguments that can be used. Because |
| we hold default arguments in the FUNCTION_TYPE (which is so |
| wrong), we can see default parameters here from deduced |
| contexts (and via typeof) for indirect function calls. |
| Fortunately we know whether we have a function decl to |
| provide default arguments in a language conformant |
| manner. */ |
| if (fndecl && TREE_PURPOSE (typetail) |
| && TREE_CODE (TREE_PURPOSE (typetail)) != DEFAULT_ARG) |
| { |
| for (; typetail != void_list_node; ++i) |
| { |
| tree parmval |
| = convert_default_arg (TREE_VALUE (typetail), |
| TREE_PURPOSE (typetail), |
| fndecl, i, complain); |
| |
| if (parmval == error_mark_node) |
| return -1; |
| |
| vec_safe_push (*values, parmval); |
| typetail = TREE_CHAIN (typetail); |
| /* ends with `...'. */ |
| if (typetail == NULL_TREE) |
| break; |
| } |
| } |
| else |
| { |
| if (complain & tf_error) |
| warn_args_num (input_location, fndecl, /*too_many_p=*/false); |
| return -1; |
| } |
| } |
| |
| return (int) i; |
| } |
| |
| /* Build a binary-operation expression, after performing default |
| conversions on the operands. CODE is the kind of expression to |
| build. ARG1 and ARG2 are the arguments. ARG1_CODE and ARG2_CODE |
| are the tree codes which correspond to ARG1 and ARG2 when issuing |
| warnings about possibly misplaced parentheses. They may differ |
| from the TREE_CODE of ARG1 and ARG2 if the parser has done constant |
| folding (e.g., if the parser sees "a | 1 + 1", it may call this |
| routine with ARG2 being an INTEGER_CST and ARG2_CODE == PLUS_EXPR). |
| To avoid issuing any parentheses warnings, pass ARG1_CODE and/or |
| ARG2_CODE as ERROR_MARK. */ |
| |
| tree |
| build_x_binary_op (location_t loc, enum tree_code code, tree arg1, |
| enum tree_code arg1_code, tree arg2, |
| enum tree_code arg2_code, tree *overload, |
| tsubst_flags_t complain) |
| { |
| tree orig_arg1; |
| tree orig_arg2; |
| tree expr; |
| |
| orig_arg1 = arg1; |
| orig_arg2 = arg2; |
| |
| if (processing_template_decl) |
| { |
| if (type_dependent_expression_p (arg1) |
| || type_dependent_expression_p (arg2)) |
| return build_min_nt_loc (loc, code, arg1, arg2); |
| arg1 = build_non_dependent_expr (arg1); |
| arg2 = build_non_dependent_expr (arg2); |
| } |
| |
| if (code == DOTSTAR_EXPR) |
| expr = build_m_component_ref (arg1, arg2, complain); |
| else |
| expr = build_new_op (loc, code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE, |
| overload, complain); |
| |
| /* Check for cases such as x+y<<z which users are likely to |
| misinterpret. But don't warn about obj << x + y, since that is a |
| common idiom for I/O. */ |
| if (warn_parentheses |
| && (complain & tf_warning) |
| && !processing_template_decl |
| && !error_operand_p (arg1) |
| && !error_operand_p (arg2) |
| && (code != LSHIFT_EXPR |
| || !CLASS_TYPE_P (TREE_TYPE (arg1)))) |
| warn_about_parentheses (loc, code, arg1_code, orig_arg1, |
| arg2_code, orig_arg2); |
| |
| if (processing_template_decl && expr != error_mark_node) |
| return build_min_non_dep (code, expr, orig_arg1, orig_arg2); |
| |
| return expr; |
| } |
| |
| /* Build and return an ARRAY_REF expression. */ |
| |
| tree |
| build_x_array_ref (location_t loc, tree arg1, tree arg2, |
| tsubst_flags_t complain) |
| { |
| tree orig_arg1 = arg1; |
| tree orig_arg2 = arg2; |
| tree expr; |
| |
| if (processing_template_decl) |
| { |
| if (type_dependent_expression_p (arg1) |
| || type_dependent_expression_p (arg2)) |
| return build_min_nt_loc (loc, ARRAY_REF, arg1, arg2, |
| NULL_TREE, NULL_TREE); |
| arg1 = build_non_dependent_expr (arg1); |
| arg2 = build_non_dependent_expr (arg2); |
| } |
| |
| expr = build_new_op (loc, ARRAY_REF, LOOKUP_NORMAL, arg1, arg2, |
| NULL_TREE, /*overload=*/NULL, complain); |
| |
| if (processing_template_decl && expr != error_mark_node) |
| return build_min_non_dep (ARRAY_REF, expr, orig_arg1, orig_arg2, |
| NULL_TREE, NULL_TREE); |
| return expr; |
| } |
| |
| /* Return whether OP is an expression of enum type cast to integer |
| type. In C++ even unsigned enum types are cast to signed integer |
| types. We do not want to issue warnings about comparisons between |
| signed and unsigned types when one of the types is an enum type. |
| Those warnings are always false positives in practice. */ |
| |
| static bool |
| enum_cast_to_int (tree op) |
| { |
| if (TREE_CODE (op) == NOP_EXPR |
| && TREE_TYPE (op) == integer_type_node |
| && TREE_CODE (TREE_TYPE (TREE_OPERAND (op, 0))) == ENUMERAL_TYPE |
| && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 0)))) |
| return true; |
| |
| /* The cast may have been pushed into a COND_EXPR. */ |
| if (TREE_CODE (op) == COND_EXPR) |
| return (enum_cast_to_int (TREE_OPERAND (op, 1)) |
| || enum_cast_to_int (TREE_OPERAND (op, 2))); |
| |
| return false; |
| } |
| |
| /* For the c-common bits. */ |
| tree |
| build_binary_op (location_t location, enum tree_code code, tree op0, tree op1, |
| int /*convert_p*/) |
| { |
| return cp_build_binary_op (location, code, op0, op1, tf_warning_or_error); |
| } |
| |
| |
| /* Build a binary-operation expression without default conversions. |
| CODE is the kind of expression to build. |
| LOCATION is the location_t of the operator in the source code. |
| This function differs from `build' in several ways: |
| the data type of the result is computed and recorded in it, |
| warnings are generated if arg data types are invalid, |
| special handling for addition and subtraction of pointers is known, |
| and some optimization is done (operations on narrow ints |
| are done in the narrower type when that gives the same result). |
| Constant folding is also done before the result is returned. |
| |
| Note that the operands will never have enumeral types |
| because either they have just had the default conversions performed |
| or they have both just been converted to some other type in which |
| the arithmetic is to be done. |
| |
| C++: must do special pointer arithmetic when implementing |
| multiple inheritance, and deal with pointer to member functions. */ |
| |
| tree |
| cp_build_binary_op (location_t location, |
| enum tree_code code, tree orig_op0, tree orig_op1, |
| tsubst_flags_t complain) |
| { |
| tree op0, op1; |
| enum tree_code code0, code1; |
| tree type0, type1; |
| const char *invalid_op_diag; |
| |
| /* Expression code to give to the expression when it is built. |
| Normally this is CODE, which is what the caller asked for, |
| but in some special cases we change it. */ |
| enum tree_code resultcode = code; |
| |
| /* Data type in which the computation is to be performed. |
| In the simplest cases this is the common type of the arguments. */ |
| tree result_type = NULL; |
| |
| /* Nonzero means operands have already been type-converted |
| in whatever way is necessary. |
| Zero means they need to be converted to RESULT_TYPE. */ |
| int converted = 0; |
| |
| /* Nonzero means create the expression with this type, rather than |
| RESULT_TYPE. */ |
| tree build_type = 0; |
| |
| /* Nonzero means after finally constructing the expression |
| convert it to this type. */ |
| tree final_type = 0; |
| |
| tree result; |
| |
| /* Nonzero if this is an operation like MIN or MAX which can |
| safely be computed in short if both args are promoted shorts. |
| Also implies COMMON. |
| -1 indicates a bitwise operation; this makes a difference |
| in the exact conditions for when it is safe to do the operation |
| in a narrower mode. */ |
| int shorten = 0; |
| |
| /* Nonzero if this is a comparison operation; |
| if both args are promoted shorts, compare the original shorts. |
| Also implies COMMON. */ |
| int short_compare = 0; |
| |
| /* Nonzero means set RESULT_TYPE to the common type of the args. */ |
| int common = 0; |
| |
| /* True if both operands have arithmetic type. */ |
| bool arithmetic_types_p; |
| |
| /* Apply default conversions. */ |
| op0 = orig_op0; |
| op1 = orig_op1; |
| |
| if (code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR |
| || code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR |
| || code == TRUTH_XOR_EXPR) |
| { |
| if (!really_overloaded_fn (op0) && !VOID_TYPE_P (TREE_TYPE (op0))) |
| op0 = decay_conversion (op0, complain); |
| if (!really_overloaded_fn (op1) && !VOID_TYPE_P (TREE_TYPE (op1))) |
| op1 = decay_conversion (op1, complain); |
| } |
| else |
| { |
| if (!really_overloaded_fn (op0) && !VOID_TYPE_P (TREE_TYPE (op0))) |
| op0 = cp_default_conversion (op0, complain); |
| if (!really_overloaded_fn (op1) && !VOID_TYPE_P (TREE_TYPE (op1))) |
| op1 = cp_default_conversion (op1, complain); |
| } |
| |
| /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
| STRIP_TYPE_NOPS (op0); |
| STRIP_TYPE_NOPS (op1); |
| |
| /* DTRT if one side is an overloaded function, but complain about it. */ |
| if (type_unknown_p (op0)) |
| { |
| tree t = instantiate_type (TREE_TYPE (op1), op0, tf_none); |
| if (t != error_mark_node) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "assuming cast to type %qT from overloaded function", |
| TREE_TYPE (t)); |
| op0 = t; |
| } |
| } |
| if (type_unknown_p (op1)) |
| { |
| tree t = instantiate_type (TREE_TYPE (op0), op1, tf_none); |
| if (t != error_mark_node) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "assuming cast to type %qT from overloaded function", |
| TREE_TYPE (t)); |
| op1 = t; |
| } |
| } |
| |
| type0 = TREE_TYPE (op0); |
| type1 = TREE_TYPE (op1); |
| |
| /* The expression codes of the data types of the arguments tell us |
| whether the arguments are integers, floating, pointers, etc. */ |
| code0 = TREE_CODE (type0); |
| code1 = TREE_CODE (type1); |
| |
| /* If an error was already reported for one of the arguments, |
| avoid reporting another error. */ |
| if (code0 == ERROR_MARK || code1 == ERROR_MARK) |
| return error_mark_node; |
| |
| if ((invalid_op_diag |
| = targetm.invalid_binary_op (code, type0, type1))) |
| { |
| error (invalid_op_diag); |
| return error_mark_node; |
| } |
| |
| /* Issue warnings about peculiar, but valid, uses of NULL. */ |
| if ((orig_op0 == null_node || orig_op1 == null_node) |
| /* It's reasonable to use pointer values as operands of && |
| and ||, so NULL is no exception. */ |
| && code != TRUTH_ANDIF_EXPR && code != TRUTH_ORIF_EXPR |
| && ( /* Both are NULL (or 0) and the operation was not a |
| comparison or a pointer subtraction. */ |
| (null_ptr_cst_p (orig_op0) && null_ptr_cst_p (orig_op1) |
| && code != EQ_EXPR && code != NE_EXPR && code != MINUS_EXPR) |
| /* Or if one of OP0 or OP1 is neither a pointer nor NULL. */ |
| || (!null_ptr_cst_p (orig_op0) |
| && !TYPE_PTR_OR_PTRMEM_P (type0)) |
| || (!null_ptr_cst_p (orig_op1) |
| && !TYPE_PTR_OR_PTRMEM_P (type1))) |
| && (complain & tf_warning)) |
| { |
| source_location loc = |
| expansion_point_location_if_in_system_header (input_location); |
| |
| warning_at (loc, OPT_Wpointer_arith, "NULL used in arithmetic"); |
| } |
| |
| /* In case when one of the operands of the binary operation is |
| a vector and another is a scalar -- convert scalar to vector. */ |
| if ((code0 == VECTOR_TYPE) != (code1 == VECTOR_TYPE)) |
| { |
| enum stv_conv convert_flag = scalar_to_vector (location, code, op0, op1, |
| complain & tf_error); |
| |
| switch (convert_flag) |
| { |
| case stv_error: |
| return error_mark_node; |
| case stv_firstarg: |
| { |
| op0 = save_expr (op0); |
| op0 = convert (TREE_TYPE (type1), op0); |
| op0 = build_vector_from_val (type1, op0); |
| type0 = TREE_TYPE (op0); |
| code0 = TREE_CODE (type0); |
| converted = 1; |
| break; |
| } |
| case stv_secondarg: |
| { |
| op1 = save_expr (op1); |
| op1 = convert (TREE_TYPE (type0), op1); |
| op1 = build_vector_from_val (type0, op1); |
| type1 = TREE_TYPE (op1); |
| code1 = TREE_CODE (type1); |
| converted = 1; |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| |
| switch (code) |
| { |
| case MINUS_EXPR: |
| /* Subtraction of two similar pointers. |
| We must subtract them as integers, then divide by object size. */ |
| if (code0 == POINTER_TYPE && code1 == POINTER_TYPE |
| && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type0), |
| TREE_TYPE (type1))) |
| return pointer_diff (op0, op1, common_pointer_type (type0, type1), |
| complain); |
| /* In all other cases except pointer - int, the usual arithmetic |
| rules apply. */ |
| else if (!(code0 == POINTER_TYPE && code1 == INTEGER_TYPE)) |
| { |
| common = 1; |
| break; |
| } |
| /* The pointer - int case is just like pointer + int; fall |
| through. */ |
| case PLUS_EXPR: |
| if ((code0 == POINTER_TYPE || code1 == POINTER_TYPE) |
| && (code0 == INTEGER_TYPE || code1 == INTEGER_TYPE)) |
| { |
| tree ptr_operand; |
| tree int_operand; |
| ptr_operand = ((code0 == POINTER_TYPE) ? op0 : op1); |
| int_operand = ((code0 == INTEGER_TYPE) ? op0 : op1); |
| if (processing_template_decl) |
| { |
| result_type = TREE_TYPE (ptr_operand); |
| break; |
| } |
| return cp_pointer_int_sum (code, |
| ptr_operand, |
| int_operand); |
| } |
| common = 1; |
| break; |
| |
| case MULT_EXPR: |
| common = 1; |
| break; |
| |
| case TRUNC_DIV_EXPR: |
| case CEIL_DIV_EXPR: |
| case FLOOR_DIV_EXPR: |
| case ROUND_DIV_EXPR: |
| case EXACT_DIV_EXPR: |
| if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
| || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE) |
| && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
| || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE)) |
| { |
| enum tree_code tcode0 = code0, tcode1 = code1; |
| tree cop1 = fold_non_dependent_expr_sfinae (op1, tf_none); |
| |
| warn_for_div_by_zero (location, maybe_constant_value (cop1)); |
| |
| if (tcode0 == COMPLEX_TYPE || tcode0 == VECTOR_TYPE) |
| tcode0 = TREE_CODE (TREE_TYPE (TREE_TYPE (op0))); |
| if (tcode1 == COMPLEX_TYPE || tcode1 == VECTOR_TYPE) |
| tcode1 = TREE_CODE (TREE_TYPE (TREE_TYPE (op1))); |
| |
| if (!(tcode0 == INTEGER_TYPE && tcode1 == INTEGER_TYPE)) |
| resultcode = RDIV_EXPR; |
| else |
| /* When dividing two signed integers, we have to promote to int. |
| unless we divide by a constant != -1. Note that default |
| conversion will have been performed on the operands at this |
| point, so we have to dig out the original type to find out if |
| it was unsigned. */ |
| shorten = ((TREE_CODE (op0) == NOP_EXPR |
| && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) |
| || (TREE_CODE (op1) == INTEGER_CST |
| && ! integer_all_onesp (op1))); |
| |
| common = 1; |
| } |
| break; |
| |
| case BIT_AND_EXPR: |
| case BIT_IOR_EXPR: |
| case BIT_XOR_EXPR: |
| if ((code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
| || (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE |
| && !VECTOR_FLOAT_TYPE_P (type0) |
| && !VECTOR_FLOAT_TYPE_P (type1))) |
| shorten = -1; |
| break; |
| |
| case TRUNC_MOD_EXPR: |
| case FLOOR_MOD_EXPR: |
| { |
| tree cop1 = fold_non_dependent_expr_sfinae (op1, tf_none); |
| |
| warn_for_div_by_zero (location, maybe_constant_value (cop1)); |
| } |
| |
| if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE |
| && TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE |
| && TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE) |
| common = 1; |
| else if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
| { |
| /* Although it would be tempting to shorten always here, that loses |
| on some targets, since the modulo instruction is undefined if the |
| quotient can't be represented in the computation mode. We shorten |
| only if unsigned or if dividing by something we know != -1. */ |
| shorten = ((TREE_CODE (op0) == NOP_EXPR |
| && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) |
| || (TREE_CODE (op1) == INTEGER_CST |
| && ! integer_all_onesp (op1))); |
| common = 1; |
| } |
| break; |
| |
| case TRUTH_ANDIF_EXPR: |
| case TRUTH_ORIF_EXPR: |
| case TRUTH_AND_EXPR: |
| case TRUTH_OR_EXPR: |
| if (TREE_CODE (type0) == VECTOR_TYPE || TREE_CODE (type1) == VECTOR_TYPE) |
| { |
| sorry ("logical operation on vector type"); |
| return error_mark_node; |
| } |
| result_type = boolean_type_node; |
| break; |
| |
| /* Shift operations: result has same type as first operand; |
| always convert second operand to int. |
| Also set SHORT_SHIFT if shifting rightward. */ |
| |
| case RSHIFT_EXPR: |
| if (code0 == VECTOR_TYPE && code1 == INTEGER_TYPE |
| && TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE) |
| { |
| result_type = type0; |
| converted = 1; |
| } |
| else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE |
| && TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE |
| && TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE |
| && TYPE_VECTOR_SUBPARTS (type0) == TYPE_VECTOR_SUBPARTS (type1)) |
| { |
| result_type = type0; |
| converted = 1; |
| } |
| else if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
| { |
| tree const_op1 = fold_non_dependent_expr_sfinae (op1, tf_none); |
| const_op1 = maybe_constant_value (const_op1); |
| if (TREE_CODE (const_op1) != INTEGER_CST) |
| const_op1 = op1; |
| result_type = type0; |
| if (TREE_CODE (const_op1) == INTEGER_CST) |
| { |
| if (tree_int_cst_lt (const_op1, integer_zero_node)) |
| { |
| if ((complain & tf_warning) |
| && c_inhibit_evaluation_warnings == 0) |
| warning (0, "right shift count is negative"); |
| } |
| else |
| { |
| if (compare_tree_int (const_op1, TYPE_PRECISION (type0)) >= 0 |
| && (complain & tf_warning) |
| && c_inhibit_evaluation_warnings == 0) |
| warning (0, "right shift count >= width of type"); |
| } |
| } |
| /* Convert the shift-count to an integer, regardless of |
| size of value being shifted. */ |
| if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
| op1 = cp_convert (integer_type_node, op1, complain); |
| /* Avoid converting op1 to result_type later. */ |
| converted = 1; |
| } |
| break; |
| |
| case LSHIFT_EXPR: |
| if (code0 == VECTOR_TYPE && code1 == INTEGER_TYPE |
| && TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE) |
| { |
| result_type = type0; |
| converted = 1; |
| } |
| else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE |
| && TREE_CODE (TREE_TYPE (type0)) == INTEGER_TYPE |
| && TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE |
| && TYPE_VECTOR_SUBPARTS (type0) == TYPE_VECTOR_SUBPARTS (type1)) |
| { |
| result_type = type0; |
| converted = 1; |
| } |
| else if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
| { |
| tree const_op1 = fold_non_dependent_expr_sfinae (op1, tf_none); |
| const_op1 = maybe_constant_value (const_op1); |
| if (TREE_CODE (const_op1) != INTEGER_CST) |
| const_op1 = op1; |
| result_type = type0; |
| if (TREE_CODE (const_op1) == INTEGER_CST) |
| { |
| if (tree_int_cst_lt (const_op1, integer_zero_node)) |
| { |
| if ((complain & tf_warning) |
| && c_inhibit_evaluation_warnings == 0) |
| warning (0, "left shift count is negative"); |
| } |
| else if (compare_tree_int (const_op1, |
| TYPE_PRECISION (type0)) >= 0) |
| { |
| if ((complain & tf_warning) |
| && c_inhibit_evaluation_warnings == 0) |
| warning (0, "left shift count >= width of type"); |
| } |
| } |
| /* Convert the shift-count to an integer, regardless of |
| size of value being shifted. */ |
| if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
| op1 = cp_convert (integer_type_node, op1, complain); |
| /* Avoid converting op1 to result_type later. */ |
| converted = 1; |
| } |
| break; |
| |
| case RROTATE_EXPR: |
| case LROTATE_EXPR: |
| if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
| { |
| result_type = type0; |
| if (TREE_CODE (op1) == INTEGER_CST) |
| { |
| if (tree_int_cst_lt (op1, integer_zero_node)) |
| { |
| if (complain & tf_warning) |
| warning (0, (code == LROTATE_EXPR) |
| ? G_("left rotate count is negative") |
| : G_("right rotate count is negative")); |
| } |
| else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) |
| { |
| if (complain & tf_warning) |
| warning (0, (code == LROTATE_EXPR) |
| ? G_("left rotate count >= width of type") |
| : G_("right rotate count >= width of type")); |
| } |
| } |
| /* Convert the shift-count to an integer, regardless of |
| size of value being shifted. */ |
| if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
| op1 = cp_convert (integer_type_node, op1, complain); |
| } |
| break; |
| |
| case EQ_EXPR: |
| case NE_EXPR: |
| if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE) |
| goto vector_compare; |
| if ((complain & tf_warning) |
| && (FLOAT_TYPE_P (type0) || FLOAT_TYPE_P (type1))) |
| warning (OPT_Wfloat_equal, |
| "comparing floating point with == or != is unsafe"); |
| if ((complain & tf_warning) |
| && ((TREE_CODE (orig_op0) == STRING_CST && !integer_zerop (op1)) |
| || (TREE_CODE (orig_op1) == STRING_CST && !integer_zerop (op0)))) |
| warning (OPT_Waddress, "comparison with string literal results in unspecified behaviour"); |
| |
| build_type = boolean_type_node; |
| if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
| || code0 == COMPLEX_TYPE || code0 == ENUMERAL_TYPE) |
| && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
| || code1 == COMPLEX_TYPE || code1 == ENUMERAL_TYPE)) |
| short_compare = 1; |
| else if ((code0 == POINTER_TYPE && code1 == POINTER_TYPE) |
| || (TYPE_PTRDATAMEM_P (type0) && TYPE_PTRDATAMEM_P (type1))) |
| result_type = composite_pointer_type (type0, type1, op0, op1, |
| CPO_COMPARISON, complain); |
| else if ((code0 == POINTER_TYPE || TYPE_PTRDATAMEM_P (type0)) |
| && null_ptr_cst_p (op1)) |
| { |
| if (TREE_CODE (op0) == ADDR_EXPR |
| && decl_with_nonnull_addr_p (TREE_OPERAND (op0, 0))) |
| { |
| if ((complain & tf_warning) |
| && c_inhibit_evaluation_warnings == 0) |
| warning (OPT_Waddress, "the address of %qD will never be NULL", |
| TREE_OPERAND (op0, 0)); |
| } |
| result_type = type0; |
| } |
| else if ((code1 == POINTER_TYPE || TYPE_PTRDATAMEM_P (type1)) |
| && null_ptr_cst_p (op0)) |
| { |
| if (TREE_CODE (op1) == ADDR_EXPR |
| && decl_with_nonnull_addr_p (TREE_OPERAND (op1, 0))) |
| { |
| if ((complain & tf_warning) |
| && c_inhibit_evaluation_warnings == 0) |
| warning (OPT_Waddress, "the address of %qD will never be NULL", |
| TREE_OPERAND (op1, 0)); |
| } |
| result_type = type1; |
| } |
| else if (null_ptr_cst_p (op0) && null_ptr_cst_p (op1)) |
| /* One of the operands must be of nullptr_t type. */ |
| result_type = TREE_TYPE (nullptr_node); |
| else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
| { |
| result_type = type0; |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids comparison between pointer and integer"); |
| else |
| return error_mark_node; |
| } |
| else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) |
| { |
| result_type = type1; |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids comparison between pointer and integer"); |
| else |
| return error_mark_node; |
| } |
| else if (TYPE_PTRMEMFUNC_P (type0) && null_ptr_cst_p (op1)) |
| { |
| if (TARGET_PTRMEMFUNC_VBIT_LOCATION |
| == ptrmemfunc_vbit_in_delta) |
| { |
| tree pfn0, delta0, e1, e2; |
| |
| if (TREE_SIDE_EFFECTS (op0)) |
| op0 = save_expr (op0); |
| |
| pfn0 = pfn_from_ptrmemfunc (op0); |
| delta0 = delta_from_ptrmemfunc (op0); |
| e1 = cp_build_binary_op (location, |
| EQ_EXPR, |
| pfn0, |
| build_zero_cst (TREE_TYPE (pfn0)), |
| complain); |
| e2 = cp_build_binary_op (location, |
| BIT_AND_EXPR, |
| delta0, |
| integer_one_node, |
| complain); |
| |
| if (complain & tf_warning) |
| maybe_warn_zero_as_null_pointer_constant (op1, input_location); |
| |
| e2 = cp_build_binary_op (location, |
| EQ_EXPR, e2, integer_zero_node, |
| complain); |
| op0 = cp_build_binary_op (location, |
| TRUTH_ANDIF_EXPR, e1, e2, |
| complain); |
| op1 = cp_convert (TREE_TYPE (op0), integer_one_node, complain); |
| } |
| else |
| { |
| op0 = build_ptrmemfunc_access_expr (op0, pfn_identifier); |
| op1 = cp_convert (TREE_TYPE (op0), op1, complain); |
| } |
| result_type = TREE_TYPE (op0); |
| } |
| else if (TYPE_PTRMEMFUNC_P (type1) && null_ptr_cst_p (op0)) |
| return cp_build_binary_op (location, code, op1, op0, complain); |
| else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_P (type1)) |
| { |
| tree type; |
| /* E will be the final comparison. */ |
| tree e; |
| /* E1 and E2 are for scratch. */ |
| tree e1; |
| tree e2; |
| tree pfn0; |
| tree pfn1; |
| tree delta0; |
| tree delta1; |
| |
| type = composite_pointer_type (type0, type1, op0, op1, |
| CPO_COMPARISON, complain); |
| |
| if (!same_type_p (TREE_TYPE (op0), type)) |
| op0 = cp_convert_and_check (type, op0, complain); |
| if (!same_type_p (TREE_TYPE (op1), type)) |
| op1 = cp_convert_and_check (type, op1, complain); |
| |
| if (op0 == error_mark_node || op1 == error_mark_node) |
| return error_mark_node; |
| |
| if (TREE_SIDE_EFFECTS (op0)) |
| op0 = save_expr (op0); |
| if (TREE_SIDE_EFFECTS (op1)) |
| op1 = save_expr (op1); |
| |
| pfn0 = pfn_from_ptrmemfunc (op0); |
| pfn1 = pfn_from_ptrmemfunc (op1); |
| delta0 = delta_from_ptrmemfunc (op0); |
| delta1 = delta_from_ptrmemfunc (op1); |
| if (TARGET_PTRMEMFUNC_VBIT_LOCATION |
| == ptrmemfunc_vbit_in_delta) |
| { |
| /* We generate: |
| |
| (op0.pfn == op1.pfn |
| && ((op0.delta == op1.delta) |
| || (!op0.pfn && op0.delta & 1 == 0 |
| && op1.delta & 1 == 0)) |
| |
| The reason for the `!op0.pfn' bit is that a NULL |
| pointer-to-member is any member with a zero PFN and |
| LSB of the DELTA field is 0. */ |
| |
| e1 = cp_build_binary_op (location, BIT_AND_EXPR, |
| delta0, |
| integer_one_node, |
| complain); |
| e1 = cp_build_binary_op (location, |
| EQ_EXPR, e1, integer_zero_node, |
| complain); |
| e2 = cp_build_binary_op (location, BIT_AND_EXPR, |
| delta1, |
| integer_one_node, |
| complain); |
| e2 = cp_build_binary_op (location, |
| EQ_EXPR, e2, integer_zero_node, |
| complain); |
| e1 = cp_build_binary_op (location, |
| TRUTH_ANDIF_EXPR, e2, e1, |
| complain); |
| e2 = cp_build_binary_op (location, EQ_EXPR, |
| pfn0, |
| build_zero_cst (TREE_TYPE (pfn0)), |
| complain); |
| e2 = cp_build_binary_op (location, |
| TRUTH_ANDIF_EXPR, e2, e1, complain); |
| e1 = cp_build_binary_op (location, |
| EQ_EXPR, delta0, delta1, complain); |
| e1 = cp_build_binary_op (location, |
| TRUTH_ORIF_EXPR, e1, e2, complain); |
| } |
| else |
| { |
| /* We generate: |
| |
| (op0.pfn == op1.pfn |
| && (!op0.pfn || op0.delta == op1.delta)) |
| |
| The reason for the `!op0.pfn' bit is that a NULL |
| pointer-to-member is any member with a zero PFN; the |
| DELTA field is unspecified. */ |
| |
| e1 = cp_build_binary_op (location, |
| EQ_EXPR, delta0, delta1, complain); |
| e2 = cp_build_binary_op (location, |
| EQ_EXPR, |
| pfn0, |
| build_zero_cst (TREE_TYPE (pfn0)), |
| complain); |
| e1 = cp_build_binary_op (location, |
| TRUTH_ORIF_EXPR, e1, e2, complain); |
| } |
| e2 = build2 (EQ_EXPR, boolean_type_node, pfn0, pfn1); |
| e = cp_build_binary_op (location, |
| TRUTH_ANDIF_EXPR, e2, e1, complain); |
| if (code == EQ_EXPR) |
| return e; |
| return cp_build_binary_op (location, |
| EQ_EXPR, e, integer_zero_node, complain); |
| } |
| else |
| { |
| gcc_assert (!TYPE_PTRMEMFUNC_P (type0) |
| || !same_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type0), |
| type1)); |
| gcc_assert (!TYPE_PTRMEMFUNC_P (type1) |
| || !same_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type1), |
| type0)); |
| } |
| |
| break; |
| |
| case MAX_EXPR: |
| case MIN_EXPR: |
| if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
| && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) |
| shorten = 1; |
| else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) |
| result_type = composite_pointer_type (type0, type1, op0, op1, |
| CPO_COMPARISON, complain); |
| break; |
| |
| case LE_EXPR: |
| case GE_EXPR: |
| case LT_EXPR: |
| case GT_EXPR: |
| if (TREE_CODE (orig_op0) == STRING_CST |
| || TREE_CODE (orig_op1) == STRING_CST) |
| { |
| if (complain & tf_warning) |
| warning (OPT_Waddress, "comparison with string literal results in unspecified behaviour"); |
| } |
| |
| if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE) |
| { |
| vector_compare: |
| tree intt; |
| if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type0), |
| TREE_TYPE (type1))) |
| { |
| error_at (location, "comparing vectors with different " |
| "element types"); |
| inform (location, "operand types are %qT and %qT", type0, type1); |
| return error_mark_node; |
| } |
| |
| if (TYPE_VECTOR_SUBPARTS (type0) != TYPE_VECTOR_SUBPARTS (type1)) |
| { |
| error_at (location, "comparing vectors with different " |
| "number of elements"); |
| inform (location, "operand types are %qT and %qT", type0, type1); |
| return error_mark_node; |
| } |
| |
| /* Always construct signed integer vector type. */ |
| intt = c_common_type_for_size (GET_MODE_BITSIZE |
| (TYPE_MODE (TREE_TYPE (type0))), 0); |
| result_type = build_opaque_vector_type (intt, |
| TYPE_VECTOR_SUBPARTS (type0)); |
| converted = 1; |
| break; |
| } |
| build_type = boolean_type_node; |
| if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
| || code0 == ENUMERAL_TYPE) |
| && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
| || code1 == ENUMERAL_TYPE)) |
| short_compare = 1; |
| else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) |
| result_type = composite_pointer_type (type0, type1, op0, op1, |
| CPO_COMPARISON, complain); |
| else if (code0 == POINTER_TYPE && null_ptr_cst_p (op1)) |
| { |
| result_type = type0; |
| if (extra_warnings && (complain & tf_warning)) |
| warning (OPT_Wextra, |
| "ordered comparison of pointer with integer zero"); |
| } |
| else if (code1 == POINTER_TYPE && null_ptr_cst_p (op0)) |
| { |
| result_type = type1; |
| if (extra_warnings && (complain & tf_warning)) |
| warning (OPT_Wextra, |
| "ordered comparison of pointer with integer zero"); |
| } |
| else if (null_ptr_cst_p (op0) && null_ptr_cst_p (op1)) |
| /* One of the operands must be of nullptr_t type. */ |
| result_type = TREE_TYPE (nullptr_node); |
| else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
| { |
| result_type = type0; |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids comparison between pointer and integer"); |
| else |
| return error_mark_node; |
| } |
| else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) |
| { |
| result_type = type1; |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids comparison between pointer and integer"); |
| else |
| return error_mark_node; |
| } |
| break; |
| |
| case UNORDERED_EXPR: |
| case ORDERED_EXPR: |
| case UNLT_EXPR: |
| case UNLE_EXPR: |
| case UNGT_EXPR: |
| case UNGE_EXPR: |
| case UNEQ_EXPR: |
| build_type = integer_type_node; |
| if (code0 != REAL_TYPE || code1 != REAL_TYPE) |
| { |
| if (complain & tf_error) |
| error ("unordered comparison on non-floating point argument"); |
| return error_mark_node; |
| } |
| common = 1; |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE |
| || code0 == ENUMERAL_TYPE) |
| && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
| || code1 == COMPLEX_TYPE || code1 == ENUMERAL_TYPE))) |
| arithmetic_types_p = 1; |
| else |
| { |
| arithmetic_types_p = 0; |
| /* Vector arithmetic is only allowed when both sides are vectors. */ |
| if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE) |
| { |
| if (!tree_int_cst_equal (TYPE_SIZE (type0), TYPE_SIZE (type1)) |
| || !same_scalar_type_ignoring_signedness (TREE_TYPE (type0), |
| TREE_TYPE (type1))) |
| { |
| binary_op_error (location, code, type0, type1); |
| return error_mark_node; |
| } |
| arithmetic_types_p = 1; |
| } |
| } |
| /* Determine the RESULT_TYPE, if it is not already known. */ |
| if (!result_type |
| && arithmetic_types_p |
| && (shorten || common || short_compare)) |
| { |
| result_type = cp_common_type (type0, type1); |
| do_warn_double_promotion (result_type, type0, type1, |
| "implicit conversion from %qT to %qT " |
| "to match other operand of binary " |
| "expression", |
| location); |
| } |
| |
| if (!result_type) |
| { |
| if (complain & tf_error) |
| error ("invalid operands of types %qT and %qT to binary %qO", |
| TREE_TYPE (orig_op0), TREE_TYPE (orig_op1), code); |
| return error_mark_node; |
| } |
| |
| /* If we're in a template, the only thing we need to know is the |
| RESULT_TYPE. */ |
| if (processing_template_decl) |
| { |
| /* Since the middle-end checks the type when doing a build2, we |
| need to build the tree in pieces. This built tree will never |
| get out of the front-end as we replace it when instantiating |
| the template. */ |
| tree tmp = build2 (resultcode, |
| build_type ? build_type : result_type, |
| NULL_TREE, op1); |
| TREE_OPERAND (tmp, 0) = op0; |
| return tmp; |
| } |
| |
| if (arithmetic_types_p) |
| { |
| bool first_complex = (code0 == COMPLEX_TYPE); |
| bool second_complex = (code1 == COMPLEX_TYPE); |
| int none_complex = (!first_complex && !second_complex); |
| |
| /* Adapted from patch for c/24581. */ |
| if (first_complex != second_complex |
| && (code == PLUS_EXPR |
| || code == MINUS_EXPR |
| || code == MULT_EXPR |
| || (code == TRUNC_DIV_EXPR && first_complex)) |
| && TREE_CODE (TREE_TYPE (result_type)) == REAL_TYPE |
| && flag_signed_zeros) |
| { |
| /* An operation on mixed real/complex operands must be |
| handled specially, but the language-independent code can |
| more easily optimize the plain complex arithmetic if |
| -fno-signed-zeros. */ |
| tree real_type = TREE_TYPE (result_type); |
| tree real, imag; |
| if (first_complex) |
| { |
| if (TREE_TYPE (op0) != result_type) |
| op0 = cp_convert_and_check (result_type, op0, complain); |
| if (TREE_TYPE (op1) != real_type) |
| op1 = cp_convert_and_check (real_type, op1, complain); |
| } |
| else |
| { |
| if (TREE_TYPE (op0) != real_type) |
| op0 = cp_convert_and_check (real_type, op0, complain); |
| if (TREE_TYPE (op1) != result_type) |
| op1 = cp_convert_and_check (result_type, op1, complain); |
| } |
| if (TREE_CODE (op0) == ERROR_MARK || TREE_CODE (op1) == ERROR_MARK) |
| return error_mark_node; |
| if (first_complex) |
| { |
| op0 = save_expr (op0); |
| real = cp_build_unary_op (REALPART_EXPR, op0, 1, complain); |
| imag = cp_build_unary_op (IMAGPART_EXPR, op0, 1, complain); |
| switch (code) |
| { |
| case MULT_EXPR: |
| case TRUNC_DIV_EXPR: |
| op1 = save_expr (op1); |
| imag = build2 (resultcode, real_type, imag, op1); |
| /* Fall through. */ |
| case PLUS_EXPR: |
| case MINUS_EXPR: |
| real = build2 (resultcode, real_type, real, op1); |
| break; |
| default: |
| gcc_unreachable(); |
| } |
| } |
| else |
| { |
| op1 = save_expr (op1); |
| real = cp_build_unary_op (REALPART_EXPR, op1, 1, complain); |
| imag = cp_build_unary_op (IMAGPART_EXPR, op1, 1, complain); |
| switch (code) |
| { |
| case MULT_EXPR: |
| op0 = save_expr (op0); |
| imag = build2 (resultcode, real_type, op0, imag); |
| /* Fall through. */ |
| case PLUS_EXPR: |
| real = build2 (resultcode, real_type, op0, real); |
| break; |
| case MINUS_EXPR: |
| real = build2 (resultcode, real_type, op0, real); |
| imag = build1 (NEGATE_EXPR, real_type, imag); |
| break; |
| default: |
| gcc_unreachable(); |
| } |
| } |
| real = fold_if_not_in_template (real); |
| imag = fold_if_not_in_template (imag); |
| result = build2 (COMPLEX_EXPR, result_type, real, imag); |
| result = fold_if_not_in_template (result); |
| return result; |
| } |
| |
| /* For certain operations (which identify themselves by shorten != 0) |
| if both args were extended from the same smaller type, |
| do the arithmetic in that type and then extend. |
| |
| shorten !=0 and !=1 indicates a bitwise operation. |
| For them, this optimization is safe only if |
| both args are zero-extended or both are sign-extended. |
| Otherwise, we might change the result. |
| E.g., (short)-1 | (unsigned short)-1 is (int)-1 |
| but calculated in (unsigned short) it would be (unsigned short)-1. */ |
| |
| if (shorten && none_complex) |
| { |
| final_type = result_type; |
| result_type = shorten_binary_op (result_type, op0, op1, |
| shorten == -1); |
| } |
| |
| /* Comparison operations are shortened too but differently. |
| They identify themselves by setting short_compare = 1. */ |
| |
| if (short_compare) |
| { |
| /* Don't write &op0, etc., because that would prevent op0 |
| from being kept in a register. |
| Instead, make copies of the our local variables and |
| pass the copies by reference, then copy them back afterward. */ |
| tree xop0 = op0, xop1 = op1, xresult_type = result_type; |
| enum tree_code xresultcode = resultcode; |
| tree val |
| = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); |
| if (val != 0) |
| return cp_convert (boolean_type_node, val, complain); |
| op0 = xop0, op1 = xop1; |
| converted = 1; |
| resultcode = xresultcode; |
| } |
| |
| if ((short_compare || code == MIN_EXPR || code == MAX_EXPR) |
| && warn_sign_compare |
| /* Do not warn until the template is instantiated; we cannot |
| bound the ranges of the arguments until that point. */ |
| && !processing_template_decl |
| && (complain & tf_warning) |
| && c_inhibit_evaluation_warnings == 0 |
| /* Even unsigned enum types promote to signed int. We don't |
| want to issue -Wsign-compare warnings for this case. */ |
| && !enum_cast_to_int (orig_op0) |
| && !enum_cast_to_int (orig_op1)) |
| { |
| tree oop0 = maybe_constant_value (orig_op0); |
| tree oop1 = maybe_constant_value (orig_op1); |
| |
| if (TREE_CODE (oop0) != INTEGER_CST) |
| oop0 = orig_op0; |
| if (TREE_CODE (oop1) != INTEGER_CST) |
| oop1 = orig_op1; |
| warn_for_sign_compare (location, oop0, oop1, op0, op1, |
| result_type, resultcode); |
| } |
| } |
| |
| /* If CONVERTED is zero, both args will be converted to type RESULT_TYPE. |
| Then the expression will be built. |
| It will be given type FINAL_TYPE if that is nonzero; |
| otherwise, it will be given type RESULT_TYPE. */ |
| if (! converted) |
| { |
| if (TREE_TYPE (op0) != result_type) |
| op0 = cp_convert_and_check (result_type, op0, complain); |
| if (TREE_TYPE (op1) != result_type) |
| op1 = cp_convert_and_check (result_type, op1, complain); |
| |
| if (op0 == error_mark_node || op1 == error_mark_node) |
| return error_mark_node; |
| } |
| |
| if (build_type == NULL_TREE) |
| build_type = result_type; |
| |
| result = build2 (resultcode, build_type, op0, op1); |
| result = fold_if_not_in_template (result); |
| if (final_type != 0) |
| result = cp_convert (final_type, result, complain); |
| |
| if (TREE_OVERFLOW_P (result) |
| && !TREE_OVERFLOW_P (op0) |
| && !TREE_OVERFLOW_P (op1)) |
| overflow_warning (location, result); |
| |
| return result; |
| } |
| |
| /* Return a tree for the sum or difference (RESULTCODE says which) |
| of pointer PTROP and integer INTOP. */ |
| |
| static tree |
| cp_pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop) |
| { |
| tree res_type = TREE_TYPE (ptrop); |
| |
| /* pointer_int_sum() uses size_in_bytes() on the TREE_TYPE(res_type) |
| in certain circumstance (when it's valid to do so). So we need |
| to make sure it's complete. We don't need to check here, if we |
| can actually complete it at all, as those checks will be done in |
| pointer_int_sum() anyway. */ |
| complete_type (TREE_TYPE (res_type)); |
| |
| return pointer_int_sum (input_location, resultcode, ptrop, |
| fold_if_not_in_template (intop)); |
| } |
| |
| /* Return a tree for the difference of pointers OP0 and OP1. |
| The resulting tree has type int. */ |
| |
| static tree |
| pointer_diff (tree op0, tree op1, tree ptrtype, tsubst_flags_t complain) |
| { |
| tree result; |
| tree restype = ptrdiff_type_node; |
| tree target_type = TREE_TYPE (ptrtype); |
| |
| if (!complete_type_or_else (target_type, NULL_TREE)) |
| return error_mark_node; |
| |
| if (TREE_CODE (target_type) == VOID_TYPE) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids using pointer of " |
| "type %<void *%> in subtraction"); |
| else |
| return error_mark_node; |
| } |
| if (TREE_CODE (target_type) == FUNCTION_TYPE) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids using pointer to " |
| "a function in subtraction"); |
| else |
| return error_mark_node; |
| } |
| if (TREE_CODE (target_type) == METHOD_TYPE) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids using pointer to " |
| "a method in subtraction"); |
| else |
| return error_mark_node; |
| } |
| |
| /* First do the subtraction as integers; |
| then drop through to build the divide operator. */ |
| |
| op0 = cp_build_binary_op (input_location, |
| MINUS_EXPR, |
| cp_convert (restype, op0, complain), |
| cp_convert (restype, op1, complain), |
| complain); |
| |
| /* This generates an error if op1 is a pointer to an incomplete type. */ |
| if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (op1)))) |
| { |
| if (complain & tf_error) |
| error ("invalid use of a pointer to an incomplete type in " |
| "pointer arithmetic"); |
| else |
| return error_mark_node; |
| } |
| |
| op1 = (TYPE_PTROB_P (ptrtype) |
| ? size_in_bytes (target_type) |
| : integer_one_node); |
| |
| /* Do the division. */ |
| |
| result = build2 (EXACT_DIV_EXPR, restype, op0, |
| cp_convert (restype, op1, complain)); |
| return fold_if_not_in_template (result); |
| } |
| |
| /* Construct and perhaps optimize a tree representation |
| for a unary operation. CODE, a tree_code, specifies the operation |
| and XARG is the operand. */ |
| |
| tree |
| build_x_unary_op (location_t loc, enum tree_code code, tree xarg, |
| tsubst_flags_t complain) |
| { |
| tree orig_expr = xarg; |
| tree exp; |
| int ptrmem = 0; |
| |
| if (processing_template_decl) |
| { |
| if (type_dependent_expression_p (xarg)) |
| return build_min_nt_loc (loc, code, xarg, NULL_TREE); |
| |
| xarg = build_non_dependent_expr (xarg); |
| } |
| |
| exp = NULL_TREE; |
| |
| /* [expr.unary.op] says: |
| |
| The address of an object of incomplete type can be taken. |
| |
| (And is just the ordinary address operator, not an overloaded |
| "operator &".) However, if the type is a template |
| specialization, we must complete the type at this point so that |
| an overloaded "operator &" will be available if required. */ |
| if (code == ADDR_EXPR |
| && TREE_CODE (xarg) != TEMPLATE_ID_EXPR |
| && ((CLASS_TYPE_P (TREE_TYPE (xarg)) |
| && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (xarg)))) |
| || (TREE_CODE (xarg) == OFFSET_REF))) |
| /* Don't look for a function. */; |
| else |
| exp = build_new_op (loc, code, LOOKUP_NORMAL, xarg, NULL_TREE, |
| NULL_TREE, /*overload=*/NULL, complain); |
| if (!exp && code == ADDR_EXPR) |
| { |
| if (is_overloaded_fn (xarg)) |
| { |
| tree fn = get_first_fn (xarg); |
| if (DECL_CONSTRUCTOR_P (fn) || DECL_DESTRUCTOR_P (fn)) |
| { |
| error (DECL_CONSTRUCTOR_P (fn) |
| ? G_("taking address of constructor %qE") |
| : G_("taking address of destructor %qE"), |
| xarg); |
| return error_mark_node; |
| } |
| } |
| |
| /* A pointer to member-function can be formed only by saying |
| &X::mf. */ |
| if (!flag_ms_extensions && TREE_CODE (TREE_TYPE (xarg)) == METHOD_TYPE |
| && (TREE_CODE (xarg) != OFFSET_REF || !PTRMEM_OK_P (xarg))) |
| { |
| if (TREE_CODE (xarg) != OFFSET_REF |
| || !TYPE_P (TREE_OPERAND (xarg, 0))) |
| { |
| error ("invalid use of %qE to form a pointer-to-member-function", |
| xarg); |
| if (TREE_CODE (xarg) != OFFSET_REF) |
| inform (input_location, " a qualified-id is required"); |
| return error_mark_node; |
| } |
| else |
| { |
| error ("parentheses around %qE cannot be used to form a" |
| " pointer-to-member-function", |
| xarg); |
| PTRMEM_OK_P (xarg) = 1; |
| } |
| } |
| |
| if (TREE_CODE (xarg) == OFFSET_REF) |
| { |
| ptrmem = PTRMEM_OK_P (xarg); |
| |
| if (!ptrmem && !flag_ms_extensions |
| && TREE_CODE (TREE_TYPE (TREE_OPERAND (xarg, 1))) == METHOD_TYPE) |
| { |
| /* A single non-static member, make sure we don't allow a |
| pointer-to-member. */ |
| xarg = build2 (OFFSET_REF, TREE_TYPE (xarg), |
| TREE_OPERAND (xarg, 0), |
| ovl_cons (TREE_OPERAND (xarg, 1), NULL_TREE)); |
| PTRMEM_OK_P (xarg) = ptrmem; |
| } |
| } |
| |
| exp = cp_build_addr_expr_strict (xarg, complain); |
| } |
| |
| if (processing_template_decl && exp != error_mark_node) |
| exp = build_min_non_dep (code, exp, orig_expr, |
| /*For {PRE,POST}{INC,DEC}REMENT_EXPR*/NULL_TREE); |
| if (TREE_CODE (exp) == ADDR_EXPR) |
| PTRMEM_OK_P (exp) = ptrmem; |
| return exp; |
| } |
| |
| /* Like c_common_truthvalue_conversion, but handle pointer-to-member |
| constants, where a null value is represented by an INTEGER_CST of |
| -1. */ |
| |
| tree |
| cp_truthvalue_conversion (tree expr) |
| { |
| tree type = TREE_TYPE (expr); |
| if (TYPE_PTRDATAMEM_P (type) |
| /* Avoid ICE on invalid use of non-static member function. */ |
| || (TREE_CODE (expr) == FUNCTION_DECL |
| && DECL_NONSTATIC_MEMBER_FUNCTION_P (expr))) |
| return build_binary_op (EXPR_LOCATION (expr), |
| NE_EXPR, expr, nullptr_node, 1); |
| else if (TYPE_PTR_P (type) || TYPE_PTRMEMFUNC_P (type)) |
| { |
| /* With -Wzero-as-null-pointer-constant do not warn for an |
| 'if (p)' or a 'while (!p)', where p is a pointer. */ |
| tree ret; |
| ++c_inhibit_evaluation_warnings; |
| ret = c_common_truthvalue_conversion (input_location, expr); |
| --c_inhibit_evaluation_warnings; |
| return ret; |
| } |
| else |
| return c_common_truthvalue_conversion (input_location, expr); |
| } |
| |
| /* Just like cp_truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. */ |
| |
| tree |
| condition_conversion (tree expr) |
| { |
| tree t; |
| if (processing_template_decl) |
| return expr; |
| t = perform_implicit_conversion_flags (boolean_type_node, expr, |
| tf_warning_or_error, LOOKUP_NORMAL); |
| t = fold_build_cleanup_point_expr (boolean_type_node, t); |
| return t; |
| } |
| |
| /* Returns the address of T. This function will fold away |
| ADDR_EXPR of INDIRECT_REF. */ |
| |
| tree |
| build_address (tree t) |
| { |
| if (error_operand_p (t) || !cxx_mark_addressable (t)) |
| return error_mark_node; |
| t = build_fold_addr_expr (t); |
| if (TREE_CODE (t) != ADDR_EXPR) |
| t = rvalue (t); |
| return t; |
| } |
| |
| /* Returns the address of T with type TYPE. */ |
| |
| tree |
| build_typed_address (tree t, tree type) |
| { |
| if (error_operand_p (t) || !cxx_mark_addressable (t)) |
| return error_mark_node; |
| t = build_fold_addr_expr_with_type (t, type); |
| if (TREE_CODE (t) != ADDR_EXPR) |
| t = rvalue (t); |
| return t; |
| } |
| |
| /* Return a NOP_EXPR converting EXPR to TYPE. */ |
| |
| tree |
| build_nop (tree type, tree expr) |
| { |
| if (type == error_mark_node || error_operand_p (expr)) |
| return expr; |
| return build1 (NOP_EXPR, type, expr); |
| } |
| |
| /* Take the address of ARG, whatever that means under C++ semantics. |
| If STRICT_LVALUE is true, require an lvalue; otherwise, allow xvalues |
| and class rvalues as well. |
| |
| Nothing should call this function directly; instead, callers should use |
| cp_build_addr_expr or cp_build_addr_expr_strict. */ |
| |
| static tree |
| cp_build_addr_expr_1 (tree arg, bool strict_lvalue, tsubst_flags_t complain) |
| { |
| tree argtype; |
| tree val; |
| |
| if (!arg || error_operand_p (arg)) |
| return error_mark_node; |
| |
| arg = mark_lvalue_use (arg); |
| argtype = lvalue_type (arg); |
| |
| gcc_assert (TREE_CODE (arg) != IDENTIFIER_NODE |
| || !IDENTIFIER_OPNAME_P (arg)); |
| |
| if (TREE_CODE (arg) == COMPONENT_REF && type_unknown_p (arg) |
| && !really_overloaded_fn (TREE_OPERAND (arg, 1))) |
| { |
| /* They're trying to take the address of a unique non-static |
| member function. This is ill-formed (except in MS-land), |
| but let's try to DTRT. |
| Note: We only handle unique functions here because we don't |
| want to complain if there's a static overload; non-unique |
| cases will be handled by instantiate_type. But we need to |
| handle this case here to allow casts on the resulting PMF. |
| We could defer this in non-MS mode, but it's easier to give |
| a useful error here. */ |
| |
| /* Inside constant member functions, the `this' pointer |
| contains an extra const qualifier. TYPE_MAIN_VARIANT |
| is used here to remove this const from the diagnostics |
| and the created OFFSET_REF. */ |
| tree base = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (arg, 0))); |
| tree fn = get_first_fn (TREE_OPERAND (arg, 1)); |
| mark_used (fn); |
| |
| if (! flag_ms_extensions) |
| { |
| tree name = DECL_NAME (fn); |
| if (!(complain & tf_error)) |
| return error_mark_node; |
| else if (current_class_type |
| && TREE_OPERAND (arg, 0) == current_class_ref) |
| /* An expression like &memfn. */ |
| permerror (input_location, "ISO C++ forbids taking the address of an unqualified" |
| " or parenthesized non-static member function to form" |
| " a pointer to member function. Say %<&%T::%D%>", |
| base, name); |
| else |
| permerror (input_location, "ISO C++ forbids taking the address of a bound member" |
| " function to form a pointer to member function." |
| " Say %<&%T::%D%>", |
| base, name); |
| } |
| arg = build_offset_ref (base, fn, /*address_p=*/true, complain); |
| } |
| |
| /* Uninstantiated types are all functions. Taking the |
| address of a function is a no-op, so just return the |
| argument. */ |
| if (type_unknown_p (arg)) |
| return build1 (ADDR_EXPR, unknown_type_node, arg); |
| |
| if (TREE_CODE (arg) == OFFSET_REF) |
| /* We want a pointer to member; bypass all the code for actually taking |
| the address of something. */ |
| goto offset_ref; |
| |
| /* Anything not already handled and not a true memory reference |
| is an error. */ |
| if (TREE_CODE (argtype) != FUNCTION_TYPE |
| && TREE_CODE (argtype) != METHOD_TYPE) |
| { |
| cp_lvalue_kind kind = lvalue_kind (arg); |
| if (kind == clk_none) |
| { |
| if (complain & tf_error) |
| lvalue_error (input_location, lv_addressof); |
| return error_mark_node; |
| } |
| if (strict_lvalue && (kind & (clk_rvalueref|clk_class))) |
| { |
| if (!(complain & tf_error)) |
| return error_mark_node; |
| if (kind & clk_class) |
| /* Make this a permerror because we used to accept it. */ |
| permerror (input_location, "taking address of temporary"); |
| else |
| error ("taking address of xvalue (rvalue reference)"); |
| } |
| } |
| |
| if (TREE_CODE (argtype) == REFERENCE_TYPE) |
| { |
| tree type = build_pointer_type (TREE_TYPE (argtype)); |
| arg = build1 (CONVERT_EXPR, type, arg); |
| return arg; |
| } |
| else if (pedantic && DECL_MAIN_P (arg)) |
| { |
| /* ARM $3.4 */ |
| /* Apparently a lot of autoconf scripts for C++ packages do this, |
| so only complain if -Wpedantic. */ |
| if (complain & (flag_pedantic_errors ? tf_error : tf_warning)) |
| pedwarn (input_location, OPT_Wpedantic, |
| "ISO C++ forbids taking address of function %<::main%>"); |
| else if (flag_pedantic_errors) |
| return error_mark_node; |
| } |
| |
| /* Let &* cancel out to simplify resulting code. */ |
| if (TREE_CODE (arg) == INDIRECT_REF) |
| { |
| /* We don't need to have `current_class_ptr' wrapped in a |
| NON_LVALUE_EXPR node. */ |
| if (arg == current_class_ref) |
| return current_class_ptr; |
| |
| arg = TREE_OPERAND (arg, 0); |
| if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE) |
| { |
| tree type = build_pointer_type (TREE_TYPE (TREE_TYPE (arg))); |
| arg = build1 (CONVERT_EXPR, type, arg); |
| } |
| else |
| /* Don't let this be an lvalue. */ |
| arg = rvalue (arg); |
| return arg; |
| } |
| |
| /* ??? Cope with user tricks that amount to offsetof. */ |
| if (TREE_CODE (argtype) != FUNCTION_TYPE |
| && TREE_CODE (argtype) != METHOD_TYPE |
| && argtype != unknown_type_node |
| && (val = get_base_address (arg)) |
| && COMPLETE_TYPE_P (TREE_TYPE (val)) |
| && TREE_CODE (val) == INDIRECT_REF |
| && TREE_CONSTANT (TREE_OPERAND (val, 0))) |
| { |
| tree type = build_pointer_type (argtype); |
| return fold_convert (type, fold_offsetof_1 (arg)); |
| } |
| |
| /* Handle complex lvalues (when permitted) |
| by reduction to simpler cases. */ |
| val = unary_complex_lvalue (ADDR_EXPR, arg); |
| if (val != 0) |
| return val; |
| |
| switch (TREE_CODE (arg)) |
| { |
| CASE_CONVERT: |
| case FLOAT_EXPR: |
| case FIX_TRUNC_EXPR: |
| /* Even if we're not being pedantic, we cannot allow this |
| extension when we're instantiating in a SFINAE |
| context. */ |
| if (! lvalue_p (arg) && complain == tf_none) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids taking the address of a cast to a non-lvalue expression"); |
| else |
| return error_mark_node; |
| } |
| break; |
| |
| case BASELINK: |
| arg = BASELINK_FUNCTIONS (arg); |
| /* Fall through. */ |
| |
| case OVERLOAD: |
| arg = OVL_CURRENT (arg); |
| break; |
| |
| case OFFSET_REF: |
| offset_ref: |
| /* Turn a reference to a non-static data member into a |
| pointer-to-member. */ |
| { |
| tree type; |
| tree t; |
| |
| gcc_assert (PTRMEM_OK_P (arg)); |
| |
| t = TREE_OPERAND (arg, 1); |
| if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE) |
| { |
| if (complain & tf_error) |
| error ("cannot create pointer to reference member %qD", t); |
| return error_mark_node; |
| } |
| |
| type = build_ptrmem_type (context_for_name_lookup (t), |
| TREE_TYPE (t)); |
| t = make_ptrmem_cst (type, TREE_OPERAND (arg, 1)); |
| return t; |
| } |
| |
| default: |
| break; |
| } |
| |
| if (argtype != error_mark_node) |
| argtype = build_pointer_type (argtype); |
| |
| /* In a template, we are processing a non-dependent expression |
| so we can just form an ADDR_EXPR with the correct type. */ |
| if (processing_template_decl || TREE_CODE (arg) != COMPONENT_REF) |
| { |
| val = build_address (arg); |
| if (TREE_CODE (arg) == OFFSET_REF) |
| PTRMEM_OK_P (val) = PTRMEM_OK_P (arg); |
| } |
| else if (BASELINK_P (TREE_OPERAND (arg, 1))) |
| { |
| tree fn = BASELINK_FUNCTIONS (TREE_OPERAND (arg, 1)); |
| |
| /* We can only get here with a single static member |
| function. */ |
| gcc_assert (TREE_CODE (fn) == FUNCTION_DECL |
| && DECL_STATIC_FUNCTION_P (fn)); |
| mark_used (fn); |
| val = build_address (fn); |
| if (TREE_SIDE_EFFECTS (TREE_OPERAND (arg, 0))) |
| /* Do not lose object's side effects. */ |
| val = build2 (COMPOUND_EXPR, TREE_TYPE (val), |
| TREE_OPERAND (arg, 0), val); |
| } |
| else if (DECL_C_BIT_FIELD (TREE_OPERAND (arg, 1))) |
| { |
| if (complain & tf_error) |
| error ("attempt to take address of bit-field structure member %qD", |
| TREE_OPERAND (arg, 1)); |
| return error_mark_node; |
| } |
| else |
| { |
| tree object = TREE_OPERAND (arg, 0); |
| tree field = TREE_OPERAND (arg, 1); |
| gcc_assert (same_type_ignoring_top_level_qualifiers_p |
| (TREE_TYPE (object), decl_type_context (field))); |
| val = build_address (arg); |
| } |
| |
| if (TREE_CODE (argtype) == POINTER_TYPE |
| && TREE_CODE (TREE_TYPE (argtype)) == METHOD_TYPE) |
| { |
| build_ptrmemfunc_type (argtype); |
| val = build_ptrmemfunc (argtype, val, 0, |
| /*c_cast_p=*/false, |
| complain); |
| } |
| |
| return val; |
| } |
| |
| /* Take the address of ARG if it has one, even if it's an rvalue. */ |
| |
| tree |
| cp_build_addr_expr (tree arg, tsubst_flags_t complain) |
| { |
| return cp_build_addr_expr_1 (arg, 0, complain); |
| } |
| |
| /* Take the address of ARG, but only if it's an lvalue. */ |
| |
| tree |
| cp_build_addr_expr_strict (tree arg, tsubst_flags_t complain) |
| { |
| return cp_build_addr_expr_1 (arg, 1, complain); |
| } |
| |
| /* C++: Must handle pointers to members. |
| |
| Perhaps type instantiation should be extended to handle conversion |
| from aggregates to types we don't yet know we want? (Or are those |
| cases typically errors which should be reported?) |
| |
| NOCONVERT nonzero suppresses the default promotions |
| (such as from short to int). */ |
| |
| tree |
| cp_build_unary_op (enum tree_code code, tree xarg, int noconvert, |
| tsubst_flags_t complain) |
| { |
| /* No default_conversion here. It causes trouble for ADDR_EXPR. */ |
| tree arg = xarg; |
| tree argtype = 0; |
| const char *errstring = NULL; |
| tree val; |
| const char *invalid_op_diag; |
| |
| if (!arg || error_operand_p (arg)) |
| return error_mark_node; |
| |
| if ((invalid_op_diag |
| = targetm.invalid_unary_op ((code == UNARY_PLUS_EXPR |
| ? CONVERT_EXPR |
| : code), |
| TREE_TYPE (xarg)))) |
| { |
| error (invalid_op_diag); |
| return error_mark_node; |
| } |
| |
| switch (code) |
| { |
| case UNARY_PLUS_EXPR: |
| case NEGATE_EXPR: |
| { |
| int flags = WANT_ARITH | WANT_ENUM; |
| /* Unary plus (but not unary minus) is allowed on pointers. */ |
| if (code == UNARY_PLUS_EXPR) |
| flags |= WANT_POINTER; |
| arg = build_expr_type_conversion (flags, arg, true); |
| if (!arg) |
| errstring = (code == NEGATE_EXPR |
| ? _("wrong type argument to unary minus") |
| : _("wrong type argument to unary plus")); |
| else |
| { |
| if (!noconvert && CP_INTEGRAL_TYPE_P (TREE_TYPE (arg))) |
| arg = cp_perform_integral_promotions (arg, complain); |
| |
| /* Make sure the result is not an lvalue: a unary plus or minus |
| expression is always a rvalue. */ |
| arg = rvalue (arg); |
| } |
| } |
| break; |
| |
| case BIT_NOT_EXPR: |
| if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) |
| { |
| code = CONJ_EXPR; |
| if (!noconvert) |
| { |
| arg = cp_default_conversion (arg, complain); |
| if (arg == error_mark_node) |
| return error_mark_node; |
| } |
| } |
| else if (!(arg = build_expr_type_conversion (WANT_INT | WANT_ENUM |
| | WANT_VECTOR_OR_COMPLEX, |
| arg, true))) |
| errstring = _("wrong type argument to bit-complement"); |
| else if (!noconvert && CP_INTEGRAL_TYPE_P (TREE_TYPE (arg))) |
| arg = cp_perform_integral_promotions (arg, complain); |
| break; |
| |
| case ABS_EXPR: |
| if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, true))) |
| errstring = _("wrong type argument to abs"); |
| else if (!noconvert) |
| { |
| arg = cp_default_conversion (arg, complain); |
| if (arg == error_mark_node) |
| return error_mark_node; |
| } |
| break; |
| |
| case CONJ_EXPR: |
| /* Conjugating a real value is a no-op, but allow it anyway. */ |
| if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, true))) |
| errstring = _("wrong type argument to conjugation"); |
| else if (!noconvert) |
| { |
| arg = cp_default_conversion (arg, complain); |
| if (arg == error_mark_node) |
| return error_mark_node; |
| } |
| break; |
| |
| case TRUTH_NOT_EXPR: |
| arg = perform_implicit_conversion (boolean_type_node, arg, |
| complain); |
| val = invert_truthvalue_loc (input_location, arg); |
| if (arg != error_mark_node) |
| return val; |
| errstring = _("in argument to unary !"); |
| break; |
| |
| case NOP_EXPR: |
| break; |
| |
| case REALPART_EXPR: |
| case IMAGPART_EXPR: |
| arg = build_real_imag_expr (input_location, code, arg); |
| if (arg == error_mark_node) |
| return arg; |
| else |
| return fold_if_not_in_template (arg); |
| |
| case PREINCREMENT_EXPR: |
| case POSTINCREMENT_EXPR: |
| case PREDECREMENT_EXPR: |
| case POSTDECREMENT_EXPR: |
| /* Handle complex lvalues (when permitted) |
| by reduction to simpler cases. */ |
| |
| val = unary_complex_lvalue (code, arg); |
| if (val != 0) |
| return val; |
| |
| arg = mark_lvalue_use (arg); |
| |
| /* Increment or decrement the real part of the value, |
| and don't change the imaginary part. */ |
| if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) |
| { |
| tree real, imag; |
| |
| arg = stabilize_reference (arg); |
| real = cp_build_unary_op (REALPART_EXPR, arg, 1, complain); |
| imag = cp_build_unary_op (IMAGPART_EXPR, arg, 1, complain); |
| real = cp_build_unary_op (code, real, 1, complain); |
| if (real == error_mark_node || imag == error_mark_node) |
| return error_mark_node; |
| return build2 (COMPLEX_EXPR, TREE_TYPE (arg), |
| real, imag); |
| } |
| |
| /* Report invalid types. */ |
| |
| if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_POINTER, |
| arg, true))) |
| { |
| if (code == PREINCREMENT_EXPR) |
| errstring = _("no pre-increment operator for type"); |
| else if (code == POSTINCREMENT_EXPR) |
| errstring = _("no post-increment operator for type"); |
| else if (code == PREDECREMENT_EXPR) |
| errstring = _("no pre-decrement operator for type"); |
| else |
| errstring = _("no post-decrement operator for type"); |
| break; |
| } |
| else if (arg == error_mark_node) |
| return error_mark_node; |
| |
| /* Report something read-only. */ |
| |
| if (CP_TYPE_CONST_P (TREE_TYPE (arg)) |
| || TREE_READONLY (arg)) |
| { |
| if (complain & tf_error) |
| cxx_readonly_error (arg, ((code == PREINCREMENT_EXPR |
| || code == POSTINCREMENT_EXPR) |
| ? lv_increment : lv_decrement)); |
| else |
| return error_mark_node; |
| } |
| |
| { |
| tree inc; |
| tree declared_type = unlowered_expr_type (arg); |
| |
| argtype = TREE_TYPE (arg); |
| |
| /* ARM $5.2.5 last annotation says this should be forbidden. */ |
| if (TREE_CODE (argtype) == ENUMERAL_TYPE) |
| { |
| if (complain & tf_error) |
| permerror (input_location, (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) |
| ? G_("ISO C++ forbids incrementing an enum") |
| : G_("ISO C++ forbids decrementing an enum")); |
| else |
| return error_mark_node; |
| } |
| |
| /* Compute the increment. */ |
| |
| if (TREE_CODE (argtype) == POINTER_TYPE) |
| { |
| tree type = complete_type (TREE_TYPE (argtype)); |
| |
| if (!COMPLETE_OR_VOID_TYPE_P (type)) |
| { |
| if (complain & tf_error) |
| error (((code == PREINCREMENT_EXPR |
| || code == POSTINCREMENT_EXPR)) |
| ? G_("cannot increment a pointer to incomplete type %qT") |
| : G_("cannot decrement a pointer to incomplete type %qT"), |
| TREE_TYPE (argtype)); |
| else |
| return error_mark_node; |
| } |
| else if ((pedantic || warn_pointer_arith) |
| && !TYPE_PTROB_P (argtype)) |
| { |
| if (complain & tf_error) |
| permerror (input_location, (code == PREINCREMENT_EXPR |
| || code == POSTINCREMENT_EXPR) |
| ? G_("ISO C++ forbids incrementing a pointer of type %qT") |
| : G_("ISO C++ forbids decrementing a pointer of type %qT"), |
| argtype); |
| else |
| return error_mark_node; |
| } |
| |
| inc = cxx_sizeof_nowarn (TREE_TYPE (argtype)); |
| } |
| else |
| inc = (TREE_CODE (argtype) == VECTOR_TYPE |
| ? build_one_cst (argtype) |
| : integer_one_node); |
| |
| inc = cp_convert (argtype, inc, complain); |
| |
| /* If 'arg' is an Objective-C PROPERTY_REF expression, then we |
| need to ask Objective-C to build the increment or decrement |
| expression for it. */ |
| if (objc_is_property_ref (arg)) |
| return objc_build_incr_expr_for_property_ref (input_location, code, |
| arg, inc); |
| |
| /* Complain about anything else that is not a true lvalue. */ |
| if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR |
| || code == POSTINCREMENT_EXPR) |
| ? lv_increment : lv_decrement), |
| complain)) |
| return error_mark_node; |
| |
| /* Forbid using -- on `bool'. */ |
| if (TREE_CODE (declared_type) == BOOLEAN_TYPE) |
| { |
| if (code == POSTDECREMENT_EXPR || code == PREDECREMENT_EXPR) |
| { |
| if (complain & tf_error) |
| error ("invalid use of Boolean expression as operand " |
| "to %<operator--%>"); |
| return error_mark_node; |
| } |
| val = boolean_increment (code, arg); |
| } |
| else if (code == POSTINCREMENT_EXPR || code == POSTDECREMENT_EXPR) |
| /* An rvalue has no cv-qualifiers. */ |
| val = build2 (code, cv_unqualified (TREE_TYPE (arg)), arg, inc); |
| else |
| val = build2 (code, TREE_TYPE (arg), arg, inc); |
| |
| TREE_SIDE_EFFECTS (val) = 1; |
| return val; |
| } |
| |
| case ADDR_EXPR: |
| /* Note that this operation never does default_conversion |
| regardless of NOCONVERT. */ |
| return cp_build_addr_expr (arg, complain); |
| |
| default: |
| break; |
| } |
| |
| if (!errstring) |
| { |
| if (argtype == 0) |
| argtype = TREE_TYPE (arg); |
| return fold_if_not_in_template (build1 (code, argtype, arg)); |
| } |
| |
| if (complain & tf_error) |
| error ("%s", errstring); |
| return error_mark_node; |
| } |
| |
| /* Hook for the c-common bits that build a unary op. */ |
| tree |
| build_unary_op (location_t /*location*/, |
| enum tree_code code, tree xarg, int noconvert) |
| { |
| return cp_build_unary_op (code, xarg, noconvert, tf_warning_or_error); |
| } |
| |
| /* Apply unary lvalue-demanding operator CODE to the expression ARG |
| for certain kinds of expressions which are not really lvalues |
| but which we can accept as lvalues. |
| |
| If ARG is not a kind of expression we can handle, return |
| NULL_TREE. */ |
| |
| tree |
| unary_complex_lvalue (enum tree_code code, tree arg) |
| { |
| /* Inside a template, making these kinds of adjustments is |
| pointless; we are only concerned with the type of the |
| expression. */ |
| if (processing_template_decl) |
| return NULL_TREE; |
| |
| /* Handle (a, b) used as an "lvalue". */ |
| if (TREE_CODE (arg) == COMPOUND_EXPR) |
| { |
| tree real_result = cp_build_unary_op (code, TREE_OPERAND (arg, 1), 0, |
| tf_warning_or_error); |
| return build2 (COMPOUND_EXPR, TREE_TYPE (real_result), |
| TREE_OPERAND (arg, 0), real_result); |
| } |
| |
| /* Handle (a ? b : c) used as an "lvalue". */ |
| if (TREE_CODE (arg) == COND_EXPR |
| || TREE_CODE (arg) == MIN_EXPR || TREE_CODE (arg) == MAX_EXPR) |
| return rationalize_conditional_expr (code, arg, tf_warning_or_error); |
| |
| /* Handle (a = b), (++a), and (--a) used as an "lvalue". */ |
| if (TREE_CODE (arg) == MODIFY_EXPR |
| || TREE_CODE (arg) == PREINCREMENT_EXPR |
| || TREE_CODE (arg) == PREDECREMENT_EXPR) |
| { |
| tree lvalue = TREE_OPERAND (arg, 0); |
| if (TREE_SIDE_EFFECTS (lvalue)) |
| { |
| lvalue = stabilize_reference (lvalue); |
| arg = build2 (TREE_CODE (arg), TREE_TYPE (arg), |
| lvalue, TREE_OPERAND (arg, 1)); |
| } |
| return unary_complex_lvalue |
| (code, build2 (COMPOUND_EXPR, TREE_TYPE (lvalue), arg, lvalue)); |
| } |
| |
| if (code != ADDR_EXPR) |
| return NULL_TREE; |
| |
| /* Handle (a = b) used as an "lvalue" for `&'. */ |
| if (TREE_CODE (arg) == MODIFY_EXPR |
| || TREE_CODE (arg) == INIT_EXPR) |
| { |
| tree real_result = cp_build_unary_op (code, TREE_OPERAND (arg, 0), 0, |
| tf_warning_or_error); |
| arg = build2 (COMPOUND_EXPR, TREE_TYPE (real_result), |
| arg, real_result); |
| TREE_NO_WARNING (arg) = 1; |
| return arg; |
| } |
| |
| if (TREE_CODE (TREE_TYPE (arg)) == FUNCTION_TYPE |
| || TREE_CODE (TREE_TYPE (arg)) == METHOD_TYPE |
| || TREE_CODE (arg) == OFFSET_REF) |
| return NULL_TREE; |
| |
| /* We permit compiler to make function calls returning |
| objects of aggregate type look like lvalues. */ |
| { |
| tree targ = arg; |
| |
| if (TREE_CODE (targ) == SAVE_EXPR) |
| targ = TREE_OPERAND (targ, 0); |
| |
| if (TREE_CODE (targ) == CALL_EXPR && MAYBE_CLASS_TYPE_P (TREE_TYPE (targ))) |
| { |
| if (TREE_CODE (arg) == SAVE_EXPR) |
| targ = arg; |
| else |
| targ = build_cplus_new (TREE_TYPE (arg), arg, tf_warning_or_error); |
| return build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (arg)), targ); |
| } |
| |
| if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == INDIRECT_REF) |
| return build3 (SAVE_EXPR, build_pointer_type (TREE_TYPE (arg)), |
| TREE_OPERAND (targ, 0), current_function_decl, NULL); |
| } |
| |
| /* Don't let anything else be handled specially. */ |
| return NULL_TREE; |
| } |
| |
| /* Mark EXP saying that we need to be able to take the |
| address of it; it should not be allocated in a register. |
| Value is true if successful. |
| |
| C++: we do not allow `current_class_ptr' to be addressable. */ |
| |
| bool |
| cxx_mark_addressable (tree exp) |
| { |
| tree x = exp; |
| |
| while (1) |
| switch (TREE_CODE (x)) |
| { |
| case ADDR_EXPR: |
| case COMPONENT_REF: |
| case ARRAY_REF: |
| case REALPART_EXPR: |
| case IMAGPART_EXPR: |
| x = TREE_OPERAND (x, 0); |
| break; |
| |
| case PARM_DECL: |
| if (x == current_class_ptr) |
| { |
| error ("cannot take the address of %<this%>, which is an rvalue expression"); |
| TREE_ADDRESSABLE (x) = 1; /* so compiler doesn't die later. */ |
| return true; |
| } |
| /* Fall through. */ |
| |
| case VAR_DECL: |
| /* Caller should not be trying to mark initialized |
| constant fields addressable. */ |
| gcc_assert (DECL_LANG_SPECIFIC (x) == 0 |
| || DECL_IN_AGGR_P (x) == 0 |
| || TREE_STATIC (x) |
| || DECL_EXTERNAL (x)); |
| /* Fall through. */ |
| |
| case RESULT_DECL: |
| if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x) |
| && !DECL_ARTIFICIAL (x)) |
| { |
| if (TREE_CODE (x) == VAR_DECL && DECL_HARD_REGISTER (x)) |
| { |
| error |
| ("address of explicit register variable %qD requested", x); |
| return false; |
| } |
| else if (extra_warnings) |
| warning |
| (OPT_Wextra, "address requested for %qD, which is declared %<register%>", x); |
| } |
| TREE_ADDRESSABLE (x) = 1; |
| return true; |
| |
| case CONST_DECL: |
| case FUNCTION_DECL: |
| TREE_ADDRESSABLE (x) = 1; |
| return true; |
| |
| case CONSTRUCTOR: |
| TREE_ADDRESSABLE (x) = 1; |
| return true; |
| |
| case TARGET_EXPR: |
| TREE_ADDRESSABLE (x) = 1; |
| cxx_mark_addressable (TREE_OPERAND (x, 0)); |
| return true; |
| |
| default: |
| return true; |
| } |
| } |
| |
| /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ |
| |
| tree |
| build_x_conditional_expr (location_t loc, tree ifexp, tree op1, tree op2, |
| tsubst_flags_t complain) |
| { |
| tree orig_ifexp = ifexp; |
| tree orig_op1 = op1; |
| tree orig_op2 = op2; |
| tree expr; |
| |
| if (processing_template_decl) |
| { |
| /* The standard says that the expression is type-dependent if |
| IFEXP is type-dependent, even though the eventual type of the |
| expression doesn't dependent on IFEXP. */ |
| if (type_dependent_expression_p (ifexp) |
| /* As a GNU extension, the middle operand may be omitted. */ |
| || (op1 && type_dependent_expression_p (op1)) |
| || type_dependent_expression_p (op2)) |
| return build_min_nt_loc (loc, COND_EXPR, ifexp, op1, op2); |
| ifexp = build_non_dependent_expr (ifexp); |
| if (op1) |
| op1 = build_non_dependent_expr (op1); |
| op2 = build_non_dependent_expr (op2); |
| } |
| |
| expr = build_conditional_expr (ifexp, op1, op2, complain); |
| if (processing_template_decl && expr != error_mark_node |
| && TREE_CODE (expr) != VEC_COND_EXPR) |
| { |
| tree min = build_min_non_dep (COND_EXPR, expr, |
| orig_ifexp, orig_op1, orig_op2); |
| /* In C++11, remember that the result is an lvalue or xvalue. |
| In C++98, lvalue_kind can just assume lvalue in a template. */ |
| if (cxx_dialect >= cxx0x |
| && lvalue_or_rvalue_with_address_p (expr) |
| && !lvalue_or_rvalue_with_address_p (min)) |
| TREE_TYPE (min) = cp_build_reference_type (TREE_TYPE (min), |
| !real_lvalue_p (expr)); |
| expr = convert_from_reference (min); |
| } |
| return expr; |
| } |
| |
| /* Given a list of expressions, return a compound expression |
| that performs them all and returns the value of the last of them. */ |
| |
| tree |
| build_x_compound_expr_from_list (tree list, expr_list_kind exp, |
| tsubst_flags_t complain) |
| { |
| tree expr = TREE_VALUE (list); |
| |
| if (BRACE_ENCLOSED_INITIALIZER_P (expr) |
| && !CONSTRUCTOR_IS_DIRECT_INIT (expr)) |
| { |
| if (complain & tf_error) |
| pedwarn (EXPR_LOC_OR_HERE (expr), 0, "list-initializer for " |
| "non-class type must not be parenthesized"); |
| else |
| return error_mark_node; |
| } |
| |
| if (TREE_CHAIN (list)) |
| { |
| if (complain & tf_error) |
| switch (exp) |
| { |
| case ELK_INIT: |
| permerror (input_location, "expression list treated as compound " |
| "expression in initializer"); |
| break; |
| case ELK_MEM_INIT: |
| permerror (input_location, "expression list treated as compound " |
| "expression in mem-initializer"); |
| break; |
| case ELK_FUNC_CAST: |
| permerror (input_location, "expression list treated as compound " |
| "expression in functional cast"); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| else |
| return error_mark_node; |
| |
| for (list = TREE_CHAIN (list); list; list = TREE_CHAIN (list)) |
| expr = build_x_compound_expr (EXPR_LOCATION (TREE_VALUE (list)), |
| expr, TREE_VALUE (list), complain); |
| } |
| |
| return expr; |
| } |
| |
| /* Like build_x_compound_expr_from_list, but using a VEC. */ |
| |
| tree |
| build_x_compound_expr_from_vec (vec<tree, va_gc> *vec, const char *msg, |
| tsubst_flags_t complain) |
| { |
| if (vec_safe_is_empty (vec)) |
| return NULL_TREE; |
| else if (vec->length () == 1) |
| return (*vec)[0]; |
| else |
| { |
| tree expr; |
| unsigned int ix; |
| tree t; |
| |
| if (msg != NULL) |
| { |
| if (complain & tf_error) |
| permerror (input_location, |
| "%s expression list treated as compound expression", |
| msg); |
| else |
| return error_mark_node; |
| } |
| |
| expr = (*vec)[0]; |
| for (ix = 1; vec->iterate (ix, &t); ++ix) |
| expr = build_x_compound_expr (EXPR_LOCATION (t), expr, |
| t, complain); |
| |
| return expr; |
| } |
| } |
| |
| /* Handle overloading of the ',' operator when needed. */ |
| |
| tree |
| build_x_compound_expr (location_t loc, tree op1, tree op2, |
| tsubst_flags_t complain) |
| { |
| tree result; |
| tree orig_op1 = op1; |
| tree orig_op2 = op2; |
| |
| if (processing_template_decl) |
| { |
| if (type_dependent_expression_p (op1) |
| || type_dependent_expression_p (op2)) |
| return build_min_nt_loc (loc, COMPOUND_EXPR, op1, op2); |
| op1 = build_non_dependent_expr (op1); |
| op2 = build_non_dependent_expr (op2); |
| } |
| |
| result = build_new_op (loc, COMPOUND_EXPR, LOOKUP_NORMAL, op1, op2, |
| NULL_TREE, /*overload=*/NULL, complain); |
| if (!result) |
| result = cp_build_compound_expr (op1, op2, complain); |
| |
| if (processing_template_decl && result != error_mark_node) |
| return build_min_non_dep (COMPOUND_EXPR, result, orig_op1, orig_op2); |
| |
| return result; |
| } |
| |
| /* Like cp_build_compound_expr, but for the c-common bits. */ |
| |
| tree |
| build_compound_expr (location_t /*loc*/, tree lhs, tree rhs) |
| { |
| return cp_build_compound_expr (lhs, rhs, tf_warning_or_error); |
| } |
| |
| /* Build a compound expression. */ |
| |
| tree |
| cp_build_compound_expr (tree lhs, tree rhs, tsubst_flags_t complain) |
| { |
| lhs = convert_to_void (lhs, ICV_LEFT_OF_COMMA, complain); |
| |
| if (lhs == error_mark_node || rhs == error_mark_node) |
| return error_mark_node; |
| |
| if (TREE_CODE (rhs) == TARGET_EXPR) |
| { |
| /* If the rhs is a TARGET_EXPR, then build the compound |
| expression inside the target_expr's initializer. This |
| helps the compiler to eliminate unnecessary temporaries. */ |
| tree init = TREE_OPERAND (rhs, 1); |
| |
| init = build2 (COMPOUND_EXPR, TREE_TYPE (init), lhs, init); |
| TREE_OPERAND (rhs, 1) = init; |
| |
| return rhs; |
| } |
| |
| if (type_unknown_p (rhs)) |
| { |
| error ("no context to resolve type of %qE", rhs); |
| return error_mark_node; |
| } |
| |
| return build2 (COMPOUND_EXPR, TREE_TYPE (rhs), lhs, rhs); |
| } |
| |
| /* Issue a diagnostic message if casting from SRC_TYPE to DEST_TYPE |
| casts away constness. CAST gives the type of cast. Returns true |
| if the cast is ill-formed, false if it is well-formed. |
| |
| ??? This function warns for casting away any qualifier not just |
| const. We would like to specify exactly what qualifiers are casted |
| away. |
| */ |
| |
| static bool |
| check_for_casting_away_constness (tree src_type, tree dest_type, |
| enum tree_code cast, tsubst_flags_t complain) |
| { |
| /* C-style casts are allowed to cast away constness. With |
| WARN_CAST_QUAL, we still want to issue a warning. */ |
| if (cast == CAST_EXPR && !warn_cast_qual) |
| return false; |
| |
| if (!casts_away_constness (src_type, dest_type, complain)) |
| return false; |
| |
| switch (cast) |
| { |
| case CAST_EXPR: |
| if (complain & tf_warning) |
| warning (OPT_Wcast_qual, |
| "cast from type %qT to type %qT casts away qualifiers", |
| src_type, dest_type); |
| return false; |
| |
| case STATIC_CAST_EXPR: |
| if (complain & tf_error) |
| error ("static_cast from type %qT to type %qT casts away qualifiers", |
| src_type, dest_type); |
| return true; |
| |
| case REINTERPRET_CAST_EXPR: |
| if (complain & tf_error) |
| error ("reinterpret_cast from type %qT to type %qT casts away qualifiers", |
| src_type, dest_type); |
| return true; |
| |
| default: |
| gcc_unreachable(); |
| } |
| } |
| |
| /* |
| Warns if the cast from expression EXPR to type TYPE is useless. |
| */ |
| void |
| maybe_warn_about_useless_cast (tree type, tree expr, tsubst_flags_t complain) |
| { |
| if (warn_useless_cast |
| && complain & tf_warning |
| && c_inhibit_evaluation_warnings == 0) |
| { |
| if (REFERENCE_REF_P (expr)) |
| expr = TREE_OPERAND (expr, 0); |
| |
| if ((TREE_CODE (type) == REFERENCE_TYPE |
| && (TYPE_REF_IS_RVALUE (type) |
| ? xvalue_p (expr) : real_lvalue_p (expr)) |
| && same_type_p (TREE_TYPE (expr), TREE_TYPE (type))) |
| || same_type_p (TREE_TYPE (expr), type)) |
| warning (OPT_Wuseless_cast, "useless cast to type %qT", type); |
| } |
| } |
| |
| /* Convert EXPR (an expression with pointer-to-member type) to TYPE |
| (another pointer-to-member type in the same hierarchy) and return |
| the converted expression. If ALLOW_INVERSE_P is permitted, a |
| pointer-to-derived may be converted to pointer-to-base; otherwise, |
| only the other direction is permitted. If C_CAST_P is true, this |
| conversion is taking place as part of a C-style cast. */ |
| |
| tree |
| convert_ptrmem (tree type, tree expr, bool allow_inverse_p, |
| bool c_cast_p, tsubst_flags_t complain) |
| { |
| if (TYPE_PTRDATAMEM_P (type)) |
| { |
| tree delta; |
| |
| if (TREE_CODE (expr) == PTRMEM_CST) |
| expr = cplus_expand_constant (expr); |
| delta = get_delta_difference (TYPE_PTRMEM_CLASS_TYPE (TREE_TYPE (expr)), |
| TYPE_PTRMEM_CLASS_TYPE (type), |
| allow_inverse_p, |
| c_cast_p, complain); |
| if (delta == error_mark_node) |
| return error_mark_node; |
| |
| if (!integer_zerop (delta)) |
| { |
| tree cond, op1, op2; |
| |
| cond = cp_build_binary_op (input_location, |
| EQ_EXPR, |
| expr, |
| build_int_cst (TREE_TYPE (expr), -1), |
| complain); |
| op1 = build_nop (ptrdiff_type_node, expr); |
| op2 = cp_build_binary_op (input_location, |
| PLUS_EXPR, op1, delta, |
| complain); |
| |
| expr = fold_build3_loc (input_location, |
| COND_EXPR, ptrdiff_type_node, cond, op1, op2); |
| |
| } |
| |
| return build_nop (type, expr); |
| } |
| else |
| return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), expr, |
| allow_inverse_p, c_cast_p, complain); |
| } |
| |
| /* Perform a static_cast from EXPR to TYPE. When C_CAST_P is true, |
| this static_cast is being attempted as one of the possible casts |
| allowed by a C-style cast. (In that case, accessibility of base |
| classes is not considered, and it is OK to cast away |
| constness.) Return the result of the cast. *VALID_P is set to |
| indicate whether or not the cast was valid. */ |
| |
| static tree |
| build_static_cast_1 (tree type, tree expr, bool c_cast_p, |
| bool *valid_p, tsubst_flags_t complain) |
| { |
| tree intype; |
| tree result; |
| cp_lvalue_kind clk; |
| |
| /* Assume the cast is valid. */ |
| *valid_p = true; |
| |
| intype = unlowered_expr_type (expr); |
| |
| /* Save casted types in the function's used types hash table. */ |
| used_types_insert (type); |
| |
| /* [expr.static.cast] |
| |
| An lvalue of type "cv1 B", where B is a class type, can be cast |
| to type "reference to cv2 D", where D is a class derived (clause |
| _class.derived_) from B, if a valid standard conversion from |
| "pointer to D" to "pointer to B" exists (_conv.ptr_), cv2 is the |
| same cv-qualification as, or greater cv-qualification than, cv1, |
| and B is not a virtual base class of D. */ |
| /* We check this case before checking the validity of "TYPE t = |
| EXPR;" below because for this case: |
| |
| struct B {}; |
| struct D : public B { D(const B&); }; |
| extern B& b; |
| void f() { static_cast<const D&>(b); } |
| |
| we want to avoid constructing a new D. The standard is not |
| completely clear about this issue, but our interpretation is |
| consistent with other compilers. */ |
| if (TREE_CODE (type) == REFERENCE_TYPE |
| && CLASS_TYPE_P (TREE_TYPE (type)) |
| && CLASS_TYPE_P (intype) |
| && (TYPE_REF_IS_RVALUE (type) || real_lvalue_p (expr)) |
| && DERIVED_FROM_P (intype, TREE_TYPE (type)) |
| && can_convert (build_pointer_type (TYPE_MAIN_VARIANT (intype)), |
| build_pointer_type (TYPE_MAIN_VARIANT |
| (TREE_TYPE (type))), |
| complain) |
| && (c_cast_p |
| || at_least_as_qualified_p (TREE_TYPE (type), intype))) |
| { |
| tree base; |
| |
| /* There is a standard conversion from "D*" to "B*" even if "B" |
| is ambiguous or inaccessible. If this is really a |
| static_cast, then we check both for inaccessibility and |
| ambiguity. However, if this is a static_cast being performed |
| because the user wrote a C-style cast, then accessibility is |
| not considered. */ |
| base = lookup_base (TREE_TYPE (type), intype, |
| c_cast_p ? ba_unique : ba_check, |
| NULL, complain); |
| |
| /* Convert from "B*" to "D*". This function will check that "B" |
| is not a virtual base of "D". */ |
| expr = build_base_path (MINUS_EXPR, build_address (expr), |
| base, /*nonnull=*/false, complain); |
| /* Convert the pointer to a reference -- but then remember that |
| there are no expressions with reference type in C++. |
| |
| We call rvalue so that there's an actual tree code |
| (NON_LVALUE_EXPR) for the static_cast; otherwise, if the operand |
| is a variable with the same type, the conversion would get folded |
| away, leaving just the variable and causing lvalue_kind to give |
| the wrong answer. */ |
| return convert_from_reference (rvalue (cp_fold_convert (type, expr))); |
| } |
| |
| /* "A glvalue of type cv1 T1 can be cast to type rvalue reference to |
| cv2 T2 if cv2 T2 is reference-compatible with cv1 T1 (8.5.3)." */ |
| if (TREE_CODE (type) == REFERENCE_TYPE |
| && TYPE_REF_IS_RVALUE (type) |
| && (clk = real_lvalue_p (expr)) |
| && reference_related_p (TREE_TYPE (type), intype) |
| && (c_cast_p || at_least_as_qualified_p (TREE_TYPE (type), intype))) |
| { |
| if (clk == clk_ordinary) |
| { |
| /* Handle the (non-bit-field) lvalue case here by casting to |
| lvalue reference and then changing it to an rvalue reference. |
| Casting an xvalue to rvalue reference will be handled by the |
| main code path. */ |
| tree lref = cp_build_reference_type (TREE_TYPE (type), false); |
| result = (perform_direct_initialization_if_possible |
| (lref, expr, c_cast_p, complain)); |
| result = cp_fold_convert (type, result); |
| /* Make sure we don't fold back down to a named rvalue reference, |
| because that would be an lvalue. */ |
| if (DECL_P (result)) |
| result = build1 (NON_LVALUE_EXPR, type, result); |
| return convert_from_reference (result); |
| } |
| else |
| /* For a bit-field or packed field, bind to a temporary. */ |
| expr = rvalue (expr); |
| } |
| |
| /* Resolve overloaded address here rather than once in |
| implicit_conversion and again in the inverse code below. */ |
| if (TYPE_PTRMEMFUNC_P (type) && type_unknown_p (expr)) |
| { |
| expr = instantiate_type (type, expr, complain); |
| intype = TREE_TYPE (expr); |
| } |
| |
| /* [expr.static.cast] |
| |
| Any expression can be explicitly converted to type cv void. */ |
| if (TREE_CODE (type) == VOID_TYPE) |
| return convert_to_void (expr, ICV_CAST, complain); |
| |
| /* [expr.static.cast] |
| |
| An expression e can be explicitly converted to a type T using a |
| static_cast of the form static_cast<T>(e) if the declaration T |
| t(e);" is well-formed, for some invented temporary variable |
| t. */ |
| result = perform_direct_initialization_if_possible (type, expr, |
| c_cast_p, complain); |
| if (result) |
| { |
| result = convert_from_reference (result); |
| |
| /* [expr.static.cast] |
| |
| If T is a reference type, the result is an lvalue; otherwise, |
| the result is an rvalue. */ |
| if (TREE_CODE (type) != REFERENCE_TYPE) |
| result = rvalue (result); |
| return result; |
| } |
| |
| /* [expr.static.cast] |
| |
| The inverse of any standard conversion sequence (clause _conv_), |
| other than the lvalue-to-rvalue (_conv.lval_), array-to-pointer |
| (_conv.array_), function-to-pointer (_conv.func_), and boolean |
| (_conv.bool_) conversions, can be performed explicitly using |
| static_cast subject to the restriction that the explicit |
| conversion does not cast away constness (_expr.const.cast_), and |
| the following additional rules for specific cases: */ |
| /* For reference, the conversions not excluded are: integral |
| promotions, floating point promotion, integral conversions, |
| floating point conversions, floating-integral conversions, |
| pointer conversions, and pointer to member conversions. */ |
| /* DR 128 |
| |
| A value of integral _or enumeration_ type can be explicitly |
| converted to an enumeration type. */ |
| /* The effect of all that is that any conversion between any two |
| types which are integral, floating, or enumeration types can be |
| performed. */ |
| if ((INTEGRAL_OR_ENUMERATION_TYPE_P (type) |
| || SCALAR_FLOAT_TYPE_P (type)) |
| && (INTEGRAL_OR_ENUMERATION_TYPE_P (intype) |
| || SCALAR_FLOAT_TYPE_P (intype))) |
| return ocp_convert (type, expr, CONV_C_CAST, LOOKUP_NORMAL, complain); |
| |
| if (TYPE_PTR_P (type) && TYPE_PTR_P (intype) |
| && CLASS_TYPE_P (TREE_TYPE (type)) |
| && CLASS_TYPE_P (TREE_TYPE (intype)) |
| && can_convert (build_pointer_type (TYPE_MAIN_VARIANT |
| (TREE_TYPE (intype))), |
| build_pointer_type (TYPE_MAIN_VARIANT |
| (TREE_TYPE (type))), |
| complain)) |
| { |
| tree base; |
| |
| if (!c_cast_p |
| && check_for_casting_away_constness (intype, type, STATIC_CAST_EXPR, |
| complain)) |
| return error_mark_node; |
| base = lookup_base (TREE_TYPE (type), TREE_TYPE (intype), |
| c_cast_p ? ba_unique : ba_check, |
| NULL, complain); |
| expr = build_base_path (MINUS_EXPR, expr, base, /*nonnull=*/false, |
| complain); |
| return cp_fold_convert(type, expr); |
| } |
| |
| if ((TYPE_PTRDATAMEM_P (type) && TYPE_PTRDATAMEM_P (intype)) |
| || (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype))) |
| { |
| tree c1; |
| tree c2; |
| tree t1; |
| tree t2; |
| |
| c1 = TYPE_PTRMEM_CLASS_TYPE (intype); |
| c2 = TYPE_PTRMEM_CLASS_TYPE (type); |
| |
| if (TYPE_PTRDATAMEM_P (type)) |
| { |
| t1 = (build_ptrmem_type |
| (c1, |
| TYPE_MAIN_VARIANT (TYPE_PTRMEM_POINTED_TO_TYPE (intype)))); |
| t2 = (build_ptrmem_type |
| (c2, |
| TYPE_MAIN_VARIANT (TYPE_PTRMEM_POINTED_TO_TYPE (type)))); |
| } |
| else |
| { |
| t1 = intype; |
| t2 = type; |
| } |
| if (can_convert (t1, t2, complain) || can_convert (t2, t1, complain)) |
| { |
| if (!c_cast_p |
| && check_for_casting_away_constness (intype, type, |
| STATIC_CAST_EXPR, |
| complain)) |
| return error_mark_node; |
| return convert_ptrmem (type, expr, /*allow_inverse_p=*/1, |
| c_cast_p, complain); |
| } |
| } |
| |
| /* [expr.static.cast] |
| |
| An rvalue of type "pointer to cv void" can be explicitly |
| converted to a pointer to object type. A value of type pointer |
| to object converted to "pointer to cv void" and back to the |
| original pointer type will have its original value. */ |
| if (TREE_CODE (intype) == POINTER_TYPE |
| && VOID_TYPE_P (TREE_TYPE (intype)) |
| && TYPE_PTROB_P (type)) |
| { |
| if (!c_cast_p |
| && check_for_casting_away_constness (intype, type, STATIC_CAST_EXPR, |
| complain)) |
| return error_mark_node; |
| return build_nop (type, expr); |
| } |
| |
| *valid_p = false; |
| return error_mark_node; |
| } |
| |
| /* Return an expression representing static_cast<TYPE>(EXPR). */ |
| |
| tree |
| build_static_cast (tree type, tree expr, tsubst_flags_t complain) |
| { |
| tree result; |
| bool valid_p; |
| |
| if (type == error_mark_node || expr == error_mark_node) |
| return error_mark_node; |
| |
| if (processing_template_decl) |
| { |
| expr = build_min (STATIC_CAST_EXPR, type, expr); |
| /* We don't know if it will or will not have side effects. */ |
| TREE_SIDE_EFFECTS (expr) = 1; |
| return convert_from_reference (expr); |
| } |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
| Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ |
| if (TREE_CODE (type) != REFERENCE_TYPE |
| && TREE_CODE (expr) == NOP_EXPR |
| && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) |
| expr = TREE_OPERAND (expr, 0); |
| |
| result = build_static_cast_1 (type, expr, /*c_cast_p=*/false, &valid_p, |
| complain); |
| if (valid_p) |
| { |
| if (result != error_mark_node) |
| maybe_warn_about_useless_cast (type, expr, complain); |
| return result; |
| } |
| |
| if (complain & tf_error) |
| error ("invalid static_cast from type %qT to type %qT", |
| TREE_TYPE (expr), type); |
| return error_mark_node; |
| } |
| |
| /* EXPR is an expression with member function or pointer-to-member |
| function type. TYPE is a pointer type. Converting EXPR to TYPE is |
| not permitted by ISO C++, but we accept it in some modes. If we |
| are not in one of those modes, issue a diagnostic. Return the |
| converted expression. */ |
| |
| tree |
| convert_member_func_to_ptr (tree type, tree expr, tsubst_flags_t complain) |
| { |
| tree intype; |
| tree decl; |
| |
| intype = TREE_TYPE (expr); |
| gcc_assert (TYPE_PTRMEMFUNC_P (intype) |
| || TREE_CODE (intype) == METHOD_TYPE); |
| |
| if (!(complain & tf_warning_or_error)) |
| return error_mark_node; |
| |
| if (pedantic || warn_pmf2ptr) |
| pedwarn (input_location, pedantic ? OPT_Wpedantic : OPT_Wpmf_conversions, |
| "converting from %qT to %qT", intype, type); |
| |
| if (TREE_CODE (intype) == METHOD_TYPE) |
| expr = build_addr_func (expr, complain); |
| else if (TREE_CODE (expr) == PTRMEM_CST) |
| expr = build_address (PTRMEM_CST_MEMBER (expr)); |
| else |
| { |
| decl = maybe_dummy_object (TYPE_PTRMEM_CLASS_TYPE (intype), 0); |
| decl = build_address (decl); |
| expr = get_member_function_from_ptrfunc (&decl, expr, complain); |
| } |
| |
| if (expr == error_mark_node) |
| return error_mark_node; |
| |
| return build_nop (type, expr); |
| } |
| |
| /* Return a representation for a reinterpret_cast from EXPR to TYPE. |
| If C_CAST_P is true, this reinterpret cast is being done as part of |
| a C-style cast. If VALID_P is non-NULL, *VALID_P is set to |
| indicate whether or not reinterpret_cast was valid. */ |
| |
| static tree |
| build_reinterpret_cast_1 (tree type, tree expr, bool c_cast_p, |
| bool *valid_p, tsubst_flags_t complain) |
| { |
| tree intype; |
| |
| /* Assume the cast is invalid. */ |
| if (valid_p) |
| *valid_p = true; |
| |
| if (type == error_mark_node || error_operand_p (expr)) |
| return error_mark_node; |
| |
| intype = TREE_TYPE (expr); |
| |
| /* Save casted types in the function's used types hash table. */ |
| used_types_insert (type); |
| |
| /* [expr.reinterpret.cast] |
| An lvalue expression of type T1 can be cast to the type |
| "reference to T2" if an expression of type "pointer to T1" can be |
| explicitly converted to the type "pointer to T2" using a |
| reinterpret_cast. */ |
| if (TREE_CODE (type) == REFERENCE_TYPE) |
| { |
| if (! real_lvalue_p (expr)) |
| { |
| if (complain & tf_error) |
| error ("invalid cast of an rvalue expression of type " |
| "%qT to type %qT", |
| intype, type); |
| return error_mark_node; |
| } |
| |
| /* Warn about a reinterpret_cast from "A*" to "B&" if "A" and |
| "B" are related class types; the reinterpret_cast does not |
| adjust the pointer. */ |
| if (TYPE_PTR_P (intype) |
| && (complain & tf_warning) |
| && (comptypes (TREE_TYPE (intype), TREE_TYPE (type), |
| COMPARE_BASE | COMPARE_DERIVED))) |
| warning (0, "casting %qT to %qT does not dereference pointer", |
| intype, type); |
| |
| expr = cp_build_addr_expr (expr, complain); |
| |
| if (warn_strict_aliasing > 2) |
| strict_aliasing_warning (TREE_TYPE (expr), type, expr); |
| |
| if (expr != error_mark_node) |
| expr = build_reinterpret_cast_1 |
| (build_pointer_type (TREE_TYPE (type)), expr, c_cast_p, |
| valid_p, complain); |
| if (expr != error_mark_node) |
| /* cp_build_indirect_ref isn't right for rvalue refs. */ |
| expr = convert_from_reference (fold_convert (type, expr)); |
| return expr; |
| } |
| |
| /* As a G++ extension, we consider conversions from member |
| functions, and pointers to member functions to |
| pointer-to-function and pointer-to-void types. If |
| -Wno-pmf-conversions has not been specified, |
| convert_member_func_to_ptr will issue an error message. */ |
| if ((TYPE_PTRMEMFUNC_P (intype) |
| || TREE_CODE (intype) == METHOD_TYPE) |
| && TYPE_PTR_P (type) |
| && (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE |
| || VOID_TYPE_P (TREE_TYPE (type)))) |
| return convert_member_func_to_ptr (type, expr, complain); |
| |
| /* If the cast is not to a reference type, the lvalue-to-rvalue, |
| array-to-pointer, and function-to-pointer conversions are |
| performed. */ |
| expr = decay_conversion (expr, complain); |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
| Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ |
| if (TREE_CODE (expr) == NOP_EXPR |
| && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) |
| expr = TREE_OPERAND (expr, 0); |
| |
| if (error_operand_p (expr)) |
| return error_mark_node; |
| |
| intype = TREE_TYPE (expr); |
| |
| /* [expr.reinterpret.cast] |
| A pointer can be converted to any integral type large enough to |
| hold it. ... A value of type std::nullptr_t can be converted to |
| an integral type; the conversion has the same meaning and |
| validity as a conversion of (void*)0 to the integral type. */ |
| if (CP_INTEGRAL_TYPE_P (type) |
| && (TYPE_PTR_P (intype) || NULLPTR_TYPE_P (intype))) |
| { |
| if (TYPE_PRECISION (type) < TYPE_PRECISION (intype)) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "cast from %qT to %qT loses precision", |
| intype, type); |
| else |
| return error_mark_node; |
| } |
| if (NULLPTR_TYPE_P (intype)) |
| return build_int_cst (type, 0); |
| } |
| /* [expr.reinterpret.cast] |
| A value of integral or enumeration type can be explicitly |
| converted to a pointer. */ |
| else if (TYPE_PTR_P (type) && INTEGRAL_OR_ENUMERATION_TYPE_P (intype)) |
| /* OK */ |
| ; |
| else if ((INTEGRAL_OR_ENUMERATION_TYPE_P (type) |
| || TYPE_PTR_OR_PTRMEM_P (type)) |
| && same_type_p (type, intype)) |
| /* DR 799 */ |
| return fold_if_not_in_template (build_nop (type, expr)); |
| else if ((TYPE_PTRFN_P (type) && TYPE_PTRFN_P (intype)) |
| || (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype))) |
| return fold_if_not_in_template (build_nop (type, expr)); |
| else if ((TYPE_PTRDATAMEM_P (type) && TYPE_PTRDATAMEM_P (intype)) |
| || (TYPE_PTROBV_P (type) && TYPE_PTROBV_P (intype))) |
| { |
| tree sexpr = expr; |
| |
| if (!c_cast_p |
| && check_for_casting_away_constness (intype, type, |
| REINTERPRET_CAST_EXPR, |
| complain)) |
| return error_mark_node; |
| /* Warn about possible alignment problems. */ |
| if (STRICT_ALIGNMENT && warn_cast_align |
| && (complain & tf_warning) |
| && !VOID_TYPE_P (type) |
| && TREE_CODE (TREE_TYPE (intype)) != FUNCTION_TYPE |
| && COMPLETE_TYPE_P (TREE_TYPE (type)) |
| && COMPLETE_TYPE_P (TREE_TYPE (intype)) |
| && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (intype))) |
| warning (OPT_Wcast_align, "cast from %qT to %qT " |
| "increases required alignment of target type", intype, type); |
| |
| /* We need to strip nops here, because the front end likes to |
| create (int *)&a for array-to-pointer decay, instead of &a[0]. */ |
| STRIP_NOPS (sexpr); |
| if (warn_strict_aliasing <= 2) |
| strict_aliasing_warning (intype, type, sexpr); |
| |
| return fold_if_not_in_template (build_nop (type, expr)); |
| } |
| else if ((TYPE_PTRFN_P (type) && TYPE_PTROBV_P (intype)) |
| || (TYPE_PTRFN_P (intype) && TYPE_PTROBV_P (type))) |
| { |
| if (pedantic && (complain & tf_warning)) |
| /* Only issue a warning, as we have always supported this |
| where possible, and it is necessary in some cases. DR 195 |
| addresses this issue, but as of 2004/10/26 is still in |
| drafting. */ |
| warning (OPT_Wpedantic, "ISO C++ forbids casting between pointer-to-function and pointer-to-object"); |
| return fold_if_not_in_template (build_nop (type, expr)); |
| } |
| else if (TREE_CODE (type) == VECTOR_TYPE) |
| return fold_if_not_in_template (convert_to_vector (type, expr)); |
| else if (TREE_CODE (intype) == VECTOR_TYPE |
| && INTEGRAL_OR_ENUMERATION_TYPE_P (type)) |
| return fold_if_not_in_template (convert_to_integer (type, expr)); |
| else |
| { |
| if (valid_p) |
| *valid_p = false; |
| if (complain & tf_error) |
| error ("invalid cast from type %qT to type %qT", intype, type); |
| return error_mark_node; |
| } |
| |
| return cp_convert (type, expr, complain); |
| } |
| |
| tree |
| build_reinterpret_cast (tree type, tree expr, tsubst_flags_t complain) |
| { |
| tree r; |
| |
| if (type == error_mark_node || expr == error_mark_node) |
| return error_mark_node; |
| |
| if (processing_template_decl) |
| { |
| tree t = build_min (REINTERPRET_CAST_EXPR, type, expr); |
| |
| if (!TREE_SIDE_EFFECTS (t) |
| && type_dependent_expression_p (expr)) |
| /* There might turn out to be side effects inside expr. */ |
| TREE_SIDE_EFFECTS (t) = 1; |
| return convert_from_reference (t); |
| } |
| |
| r = build_reinterpret_cast_1 (type, expr, /*c_cast_p=*/false, |
| /*valid_p=*/NULL, complain); |
| if (r != error_mark_node) |
| maybe_warn_about_useless_cast (type, expr, complain); |
| return r; |
| } |
| |
| /* Perform a const_cast from EXPR to TYPE. If the cast is valid, |
| return an appropriate expression. Otherwise, return |
| error_mark_node. If the cast is not valid, and COMPLAIN is true, |
| then a diagnostic will be issued. If VALID_P is non-NULL, we are |
| performing a C-style cast, its value upon return will indicate |
| whether or not the conversion succeeded. */ |
| |
| static tree |
| build_const_cast_1 (tree dst_type, tree expr, tsubst_flags_t complain, |
| bool *valid_p) |
| { |
| tree src_type; |
| tree reference_type; |
| |
| /* Callers are responsible for handling error_mark_node as a |
| destination type. */ |
| gcc_assert (dst_type != error_mark_node); |
| /* In a template, callers should be building syntactic |
| representations of casts, not using this machinery. */ |
| gcc_assert (!processing_template_decl); |
| |
| /* Assume the conversion is invalid. */ |
| if (valid_p) |
| *valid_p = false; |
| |
| if (!POINTER_TYPE_P (dst_type) && !TYPE_PTRDATAMEM_P (dst_type)) |
| { |
| if (complain & tf_error) |
| error ("invalid use of const_cast with type %qT, " |
| "which is not a pointer, " |
| "reference, nor a pointer-to-data-member type", dst_type); |
| return error_mark_node; |
| } |
| |
| if (TREE_CODE (TREE_TYPE (dst_type)) == FUNCTION_TYPE) |
| { |
| if (complain & tf_error) |
| error ("invalid use of const_cast with type %qT, which is a pointer " |
| "or reference to a function type", dst_type); |
| return error_mark_node; |
| } |
| |
| /* Save casted types in the function's used types hash table. */ |
| used_types_insert (dst_type); |
| |
| src_type = TREE_TYPE (expr); |
| /* Expressions do not really have reference types. */ |
| if (TREE_CODE (src_type) == REFERENCE_TYPE) |
| src_type = TREE_TYPE (src_type); |
| |
| /* [expr.const.cast] |
| |
| For two object types T1 and T2, if a pointer to T1 can be explicitly |
| converted to the type "pointer to T2" using a const_cast, then the |
| following conversions can also be made: |
| |
| -- an lvalue of type T1 can be explicitly converted to an lvalue of |
| type T2 using the cast const_cast<T2&>; |
| |
| -- a glvalue of type T1 can be explicitly converted to an xvalue of |
| type T2 using the cast const_cast<T2&&>; and |
| |
| -- if T1 is a class type, a prvalue of type T1 can be explicitly |
| converted to an xvalue of type T2 using the cast const_cast<T2&&>. */ |
| |
| if (TREE_CODE (dst_type) == REFERENCE_TYPE) |
| { |
| reference_type = dst_type; |
| if (!TYPE_REF_IS_RVALUE (dst_type) |
| ? real_lvalue_p (expr) |
| : (CLASS_TYPE_P (TREE_TYPE (dst_type)) |
| ? lvalue_p (expr) |
| : lvalue_or_rvalue_with_address_p (expr))) |
| /* OK. */; |
| else |
| { |
| if (complain & tf_error) |
| error ("invalid const_cast of an rvalue of type %qT to type %qT", |
| src_type, dst_type); |
| return error_mark_node; |
| } |
| dst_type = build_pointer_type (TREE_TYPE (dst_type)); |
| src_type = build_pointer_type (src_type); |
| } |
| else |
| { |
| reference_type = NULL_TREE; |
| /* If the destination type is not a reference type, the |
| lvalue-to-rvalue, array-to-pointer, and function-to-pointer |
| conversions are performed. */ |
| src_type = type_decays_to (src_type); |
| if (src_type == error_mark_node) |
| return error_mark_node; |
| } |
| |
| if (TYPE_PTR_P (src_type) || TYPE_PTRDATAMEM_P (src_type)) |
| { |
| if (comp_ptr_ttypes_const (dst_type, src_type)) |
| { |
| if (valid_p) |
| { |
| *valid_p = true; |
| /* This cast is actually a C-style cast. Issue a warning if |
| the user is making a potentially unsafe cast. */ |
| check_for_casting_away_constness (src_type, dst_type, |
| CAST_EXPR, complain); |
| } |
| if (reference_type) |
| { |
| expr = cp_build_addr_expr (expr, complain); |
| if (expr == error_mark_node) |
| return error_mark_node; |
| expr = build_nop (reference_type, expr); |
| return convert_from_reference (expr); |
| } |
| else |
| { |
| expr = decay_conversion (expr, complain); |
| if (expr == error_mark_node) |
| return error_mark_node; |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an |
| lvalue. Strip such NOP_EXPRs if VALUE is being used in |
| non-lvalue context. */ |
| if (TREE_CODE (expr) == NOP_EXPR |
| && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) |
| expr = TREE_OPERAND (expr, 0); |
| return build_nop (dst_type, expr); |
| } |
| } |
| else if (valid_p |
| && !at_least_as_qualified_p (TREE_TYPE (dst_type), |
| TREE_TYPE (src_type))) |
| check_for_casting_away_constness (src_type, dst_type, CAST_EXPR, |
| complain); |
| } |
| |
| if (complain & tf_error) |
| error ("invalid const_cast from type %qT to type %qT", |
| src_type, dst_type); |
| return error_mark_node; |
| } |
| |
| tree |
| build_const_cast (tree type, tree expr, tsubst_flags_t complain) |
| { |
| tree r; |
| |
| if (type == error_mark_node || error_operand_p (expr)) |
| return error_mark_node; |
| |
| if (processing_template_decl) |
| { |
| tree t = build_min (CONST_CAST_EXPR, type, expr); |
| |
| if (!TREE_SIDE_EFFECTS (t) |
| && type_dependent_expression_p (expr)) |
| /* There might turn out to be side effects inside expr. */ |
| TREE_SIDE_EFFECTS (t) = 1; |
| return convert_from_reference (t); |
| } |
| |
| r = build_const_cast_1 (type, expr, complain, /*valid_p=*/NULL); |
| if (r != error_mark_node) |
| maybe_warn_about_useless_cast (type, expr, complain); |
| return r; |
| } |
| |
| /* Like cp_build_c_cast, but for the c-common bits. */ |
| |
| tree |
| build_c_cast (location_t /*loc*/, tree type, tree expr) |
| { |
| return cp_build_c_cast (type, expr, tf_warning_or_error); |
| } |
| |
| /* Build an expression representing an explicit C-style cast to type |
| TYPE of expression EXPR. */ |
| |
| tree |
| cp_build_c_cast (tree type, tree expr, tsubst_flags_t complain) |
| { |
| tree value = expr; |
| tree result; |
| bool valid_p; |
| |
| if (type == error_mark_node || error_operand_p (expr)) |
| return error_mark_node; |
| |
| if (processing_template_decl) |
| { |
| tree t = build_min (CAST_EXPR, type, |
| tree_cons (NULL_TREE, value, NULL_TREE)); |
| /* We don't know if it will or will not have side effects. */ |
| TREE_SIDE_EFFECTS (t) = 1; |
| return convert_from_reference (t); |
| } |
| |
| /* Casts to a (pointer to a) specific ObjC class (or 'id' or |
| 'Class') should always be retained, because this information aids |
| in method lookup. */ |
| if (objc_is_object_ptr (type) |
| && objc_is_object_ptr (TREE_TYPE (expr))) |
| return build_nop (type, expr); |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
| Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ |
| if (TREE_CODE (type) != REFERENCE_TYPE |
| && TREE_CODE (value) == NOP_EXPR |
| && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0))) |
| value = TREE_OPERAND (value, 0); |
| |
| if (TREE_CODE (type) == ARRAY_TYPE) |
| { |
| /* Allow casting from T1* to T2[] because Cfront allows it. |
| NIHCL uses it. It is not valid ISO C++ however. */ |
| if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE) |
| { |
| if (complain & tf_error) |
| permerror (input_location, "ISO C++ forbids casting to an array type %qT", type); |
| else |
| return error_mark_node; |
| type = build_pointer_type (TREE_TYPE (type)); |
| } |
| else |
| { |
| if (complain & tf_error) |
| error ("ISO C++ forbids casting to an array type %qT", type); |
| return error_mark_node; |
| } |
| } |
| |
| if (TREE_CODE (type) == FUNCTION_TYPE |
| || TREE_CODE (type) == METHOD_TYPE) |
| { |
| if (complain & tf_error) |
| error ("invalid cast to function type %qT", type); |
| return error_mark_node; |
| } |
| |
| if (TREE_CODE (type) == POINTER_TYPE |
| && TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE |
| /* Casting to an integer of smaller size is an error detected elsewhere. */ |
| && TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (value)) |
| /* Don't warn about converting any constant. */ |
| && !TREE_CONSTANT (value)) |
| warning_at (input_location, OPT_Wint_to_pointer_cast, |
| "cast to pointer from integer of different size"); |
| |
| /* A C-style cast can be a const_cast. */ |
| result = build_const_cast_1 (type, value, complain & tf_warning, |
| &valid_p); |
| if (valid_p) |
| { |
| if (result != error_mark_node) |
| maybe_warn_about_useless_cast (type, value, complain); |
| return result; |
| } |
| |
| /* Or a static cast. */ |
| result = build_static_cast_1 (type, value, /*c_cast_p=*/true, |
| &valid_p, complain); |
| /* Or a reinterpret_cast. */ |
| if (!valid_p) |
| result = build_reinterpret_cast_1 (type, value, /*c_cast_p=*/true, |
| &valid_p, complain); |
| /* The static_cast or reinterpret_cast may be followed by a |
| const_cast. */ |
| if (valid_p |
| /* A valid cast may result in errors if, for example, a |
| conversion to an ambiguous base class is required. */ |
| && !error_operand_p (result)) |
| { |
| tree result_type; |
| |
| maybe_warn_about_useless_cast (type, value, complain); |
| |
| /* Non-class rvalues always have cv-unqualified type. */ |
| if (!CLASS_TYPE_P (type)) |
| type = TYPE_MAIN_VARIANT (type); |
| result_type = TREE_TYPE (result); |
| if (!CLASS_TYPE_P (result_type) && TREE_CODE (type) != REFERENCE_TYPE) |
| result_type = TYPE_MAIN_VARIANT (result_type); |
| /* If the type of RESULT does not match TYPE, perform a |
| const_cast to make it match. If the static_cast or |
| reinterpret_cast succeeded, we will differ by at most |
| cv-qualification, so the follow-on const_cast is guaranteed |
| to succeed. */ |
| if (!same_type_p (non_reference (type), non_reference (result_type))) |
| { |
| result = build_const_cast_1 (type, result, false, &valid_p); |
| gcc_assert (valid_p); |
| } |
| return result; |
| } |
| |
| return error_mark_node; |
| } |
| |
| /* For use from the C common bits. */ |
| tree |
| build_modify_expr (location_t /*location*/, |
| tree lhs, tree /*lhs_origtype*/, |
| enum tree_code modifycode, |
| location_t /*rhs_location*/, tree rhs, |
| tree /*rhs_origtype*/) |
| { |
| return cp_build_modify_expr (lhs, modifycode, rhs, tf_warning_or_error); |
| } |
| |
| /* Build an assignment expression of lvalue LHS from value RHS. |
| MODIFYCODE is the code for a binary operator that we use |
| to combine the old value of LHS with RHS to get the new value. |
| Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. |
| |
| C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. */ |
| |
| tree |
| cp_build_modify_expr (tree lhs, enum tree_code modifycode, tree rhs, |
| tsubst_flags_t complain) |
| { |
| tree result; |
| tree newrhs = rhs; |
| tree lhstype = TREE_TYPE (lhs); |
| tree olhstype = lhstype; |
| bool plain_assign = (modifycode == NOP_EXPR); |
| |
| /* Avoid duplicate error messages from operands that had errors. */ |
| if (error_operand_p (lhs) || error_operand_p (rhs)) |
| return error_mark_node; |
| |
| /* Handle control structure constructs used as "lvalues". */ |
| switch (TREE_CODE (lhs)) |
| { |
| /* Handle --foo = 5; as these are valid constructs in C++. */ |
| case PREDECREMENT_EXPR: |
| case PREINCREMENT_EXPR: |
| if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0))) |
| lhs = build2 (TREE_CODE (lhs), TREE_TYPE (lhs), |
| stabilize_reference (TREE_OPERAND (lhs, 0)), |
| TREE_OPERAND (lhs, 1)); |
| newrhs = cp_build_modify_expr (TREE_OPERAND (lhs, 0), |
| modifycode, rhs, complain); |
| if (newrhs == error_mark_node) |
| return error_mark_node; |
| return build2 (COMPOUND_EXPR, lhstype, lhs, newrhs); |
| |
| /* Handle (a, b) used as an "lvalue". */ |
| case COMPOUND_EXPR: |
| newrhs = cp_build_modify_expr (TREE_OPERAND (lhs, 1), |
| modifycode, rhs, complain); |
| if (newrhs == error_mark_node) |
| return error_mark_node; |
| return build2 (COMPOUND_EXPR, lhstype, |
| TREE_OPERAND (lhs, 0), newrhs); |
| |
| case MODIFY_EXPR: |
| if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0))) |
| lhs = build2 (TREE_CODE (lhs), TREE_TYPE (lhs), |
| stabilize_reference (TREE_OPERAND (lhs, 0)), |
| TREE_OPERAND (lhs, 1)); |
| newrhs = cp_build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs, |
| complain); |
| if (newrhs == error_mark_node) |
| return error_mark_node; |
| return build2 (COMPOUND_EXPR, lhstype, lhs, newrhs); |
| |
| case MIN_EXPR: |
| case MAX_EXPR: |
| /* MIN_EXPR and MAX_EXPR are currently only permitted as lvalues, |
| when neither operand has side-effects. */ |
| if (!lvalue_or_else (lhs, lv_assign, complain)) |
| return error_mark_node; |
| |
| gcc_assert (!TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0)) |
| && !TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 1))); |
| |
| lhs = build3 (COND_EXPR, TREE_TYPE (lhs), |
| build2 (TREE_CODE (lhs) == MIN_EXPR ? LE_EXPR : GE_EXPR, |
| boolean_type_node, |
| TREE_OPERAND (lhs, 0), |
| TREE_OPERAND (lhs, 1)), |
| TREE_OPERAND (lhs, 0), |
| TREE_OPERAND (lhs, 1)); |
| /* Fall through. */ |
| |
| /* Handle (a ? b : c) used as an "lvalue". */ |
| case COND_EXPR: |
| { |
| /* Produce (a ? (b = rhs) : (c = rhs)) |
| except that the RHS goes through a save-expr |
| so the code to compute it is only emitted once. */ |
| tree cond; |
| tree preeval = NULL_TREE; |
| |
| if (VOID_TYPE_P (TREE_TYPE (rhs))) |
| { |
| if (complain & tf_error) |
| error ("void value not ignored as it ought to be"); |
| return error_mark_node; |
| } |
| |
| rhs = stabilize_expr (rhs, &preeval); |
| |
| /* Check this here to avoid odd errors when trying to convert |
| a throw to the type of the COND_EXPR. */ |
| if (!lvalue_or_else (lhs, lv_assign, complain)) |
| return error_mark_node; |
| |
| cond = build_conditional_expr |
| (TREE_OPERAND (lhs, 0), |
| cp_build_modify_expr (TREE_OPERAND (lhs, 1), |
| modifycode, rhs, complain), |
| cp_build_modify_expr (TREE_OPERAND (lhs, 2), |
| modifycode, rhs, complain), |
| complain); |
| |
| if (cond == error_mark_node) |
| return cond; |
| /* Make sure the code to compute the rhs comes out |
| before the split. */ |
| if (preeval) |
| cond = build2 (COMPOUND_EXPR, TREE_TYPE (lhs), preeval, cond); |
| return cond; |
| } |
| |
| default: |
| break; |
| } |
| |
| if (modifycode == INIT_EXPR) |
| { |
| if (BRACE_ENCLOSED_INITIALIZER_P (rhs)) |
| /* Do the default thing. */; |
| else if (TREE_CODE (rhs) == CONSTRUCTOR) |
| { |
| /* Compound literal. */ |
| if (! same_type_p (TREE_TYPE (rhs), lhstype)) |
| /* Call convert to generate an error; see PR 11063. */ |
| rhs = convert (lhstype, rhs); |
| result = build2 (INIT_EXPR, lhstype, lhs, rhs); |
| TREE_SIDE_EFFECTS (result) = 1; |
| return result; |
| } |
| else if (! MAYBE_CLASS_TYPE_P (lhstype)) |
| /* Do the default thing. */; |
| else |
| { |
| vec<tree, va_gc> *rhs_vec = make_tree_vector_single (rhs); |
| result = build_special_member_call (lhs, complete_ctor_identifier, |
| &rhs_vec, lhstype, LOOKUP_NORMAL, |
| complain); |
| release_tree_vector (rhs_vec); |
| if (result == NULL_TREE) |
| return error_mark_node; |
| return result; |
| } |
| } |
| else |
| { |
| lhs = require_complete_type_sfinae (lhs, complain); |
| if (lhs == error_mark_node) |
| return error_mark_node; |
| |
| if (modifycode == NOP_EXPR) |
| { |
| if (c_dialect_objc ()) |
| { |
| result = objc_maybe_build_modify_expr (lhs, rhs); |
| if (result) |
| return result; |
| } |
| |
| /* `operator=' is not an inheritable operator. */ |
| if (! MAYBE_CLASS_TYPE_P (lhstype)) |
| /* Do the default thing. */; |
| else |
| { |
| result = build_new_op (input_location, MODIFY_EXPR, |
| LOOKUP_NORMAL, lhs, rhs, |
| make_node (NOP_EXPR), /*overload=*/NULL, |
| complain); |
| if (result == NULL_TREE) |
| return error_mark_node; |
| return result; |
| } |
| lhstype = olhstype; |
| } |
| else |
| { |
| tree init = NULL_TREE; |
| |
| /* A binary op has been requested. Combine the old LHS |
| value with the RHS producing the value we should actually |
| store into the LHS. */ |
| gcc_assert (!((TREE_CODE (lhstype) == REFERENCE_TYPE |
| && MAYBE_CLASS_TYPE_P (TREE_TYPE (lhstype))) |
| || MAYBE_CLASS_TYPE_P (lhstype))); |
| |
| /* Preevaluate the RHS to make sure its evaluation is complete |
| before the lvalue-to-rvalue conversion of the LHS: |
| |
| [expr.ass] With respect to an indeterminately-sequenced |
| function call, the operation of a compound assignment is a |
| single evaluation. [ Note: Therefore, a function call shall |
| not intervene between the lvalue-to-rvalue conversion and the |
| side effect associated with any single compound assignment |
| operator. -- end note ] */ |
| lhs = stabilize_reference (lhs); |
| rhs = rvalue (rhs); |
| rhs = stabilize_expr (rhs, &init); |
| newrhs = cp_build_binary_op (input_location, |
| modifycode, lhs, rhs, |
| complain); |
| if (newrhs == error_mark_node) |
| { |
| if (complain & tf_error) |
| error (" in evaluation of %<%Q(%#T, %#T)%>", modifycode, |
| TREE_TYPE (lhs), TREE_TYPE (rhs)); |
| return error_mark_node; |
| } |
| |
| if (init) |
| newrhs = build2 (COMPOUND_EXPR, TREE_TYPE (newrhs), init, newrhs); |
| |
| /* Now it looks like a plain assignment. */ |
| modifycode = NOP_EXPR; |
| if (c_dialect_objc ()) |
| { |
| result = objc_maybe_build_modify_expr (lhs, newrhs); |
| if (result) |
| return result; |
| } |
| } |
| gcc_assert (TREE_CODE (lhstype) != REFERENCE_TYPE); |
| gcc_assert (TREE_CODE (TREE_TYPE (newrhs)) != REFERENCE_TYPE); |
| } |
| |
| /* The left-hand side must be an lvalue. */ |
| if (!lvalue_or_else (lhs, lv_assign, complain)) |
| return error_mark_node; |
| |
| /* Warn about modifying something that is `const'. Don't warn if |
| this is initialization. */ |
| if (modifycode != INIT_EXPR |
| && (TREE_READONLY (lhs) || CP_TYPE_CONST_P (lhstype) |
| /* Functions are not modifiable, even though they are |
| lvalues. */ |
| || TREE_CODE (TREE_TYPE (lhs)) == FUNCTION_TYPE |
| || TREE_CODE (TREE_TYPE (lhs)) == METHOD_TYPE |
| /* If it's an aggregate and any field is const, then it is |
| effectively const. */ |
| || (CLASS_TYPE_P (lhstype) |
| && C_TYPE_FIELDS_READONLY (lhstype)))) |
| { |
| if (complain & tf_error) |
| cxx_readonly_error (lhs, lv_assign); |
| else |
| return error_mark_node; |
| } |
| |
| /* If storing into a structure or union member, it may have been given a |
| lowered bitfield type. We need to convert to the declared type first, |
| so retrieve it now. */ |
| |
| olhstype = unlowered_expr_type (lhs); |
| |
| /* Convert new value to destination type. */ |
| |
| if (TREE_CODE (lhstype) == ARRAY_TYPE) |
| { |
| int from_array; |
| |
| if (BRACE_ENCLOSED_INITIALIZER_P (newrhs)) |
| { |
| if (modifycode != INIT_EXPR) |
| { |
| if (complain & tf_error) |
| error ("assigning to an array from an initializer list"); |
| return error_mark_node; |
| } |
| if (check_array_initializer (lhs, lhstype, newrhs)) |
| return error_mark_node; |
| newrhs = digest_init (lhstype, newrhs, complain); |
| if (newrhs == error_mark_node) |
| return error_mark_node; |
| } |
| |
| else if (!same_or_base_type_p (TYPE_MAIN_VARIANT (lhstype), |
| TYPE_MAIN_VARIANT (TREE_TYPE (newrhs)))) |
| { |
| if (complain & tf_error) |
| error ("incompatible types in assignment of %qT to %qT", |
| TREE_TYPE (rhs), lhstype); |
| return error_mark_node; |
| } |
| |
| /* Allow array assignment in compiler-generated code. */ |
| else if (!current_function_decl |
| || !DECL_DEFAULTED_FN (current_function_decl)) |
| { |
| /* This routine is used for both initialization and assignment. |
| Make sure the diagnostic message differentiates the context. */ |
| if (complain & tf_error) |
| { |
| if (modifycode == INIT_EXPR) |
| error ("array used as initializer"); |
| else |
| error ("invalid array assignment"); |
| } |
| return error_mark_node; |
| } |
| |
| from_array = TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE |
| ? 1 + (modifycode != INIT_EXPR): 0; |
| return build_vec_init (lhs, NULL_TREE, newrhs, |
| /*explicit_value_init_p=*/false, |
| from_array, complain); |
| } |
| |
| if (modifycode == INIT_EXPR) |
| /* Calls with INIT_EXPR are all direct-initialization, so don't set |
| LOOKUP_ONLYCONVERTING. */ |
| newrhs = convert_for_initialization (lhs, olhstype, newrhs, LOOKUP_NORMAL, |
| ICR_INIT, NULL_TREE, 0, |
| complain); |
| else |
| newrhs = convert_for_assignment (olhstype, newrhs, ICR_ASSIGN, |
| NULL_TREE, 0, complain, LOOKUP_IMPLICIT); |
| |
| if (!same_type_p (lhstype, olhstype)) |
| newrhs = cp_convert_and_check (lhstype, newrhs, complain); |
| |
| if (modifycode != INIT_EXPR) |
| { |
| if (TREE_CODE (newrhs) == CALL_EXPR |
| && TYPE_NEEDS_CONSTRUCTING (lhstype)) |
| newrhs = build_cplus_new (lhstype, newrhs, complain); |
| |
| /* Can't initialize directly from a TARGET_EXPR, since that would |
| cause the lhs to be constructed twice, and possibly result in |
| accidental self-initialization. So we force the TARGET_EXPR to be |
| expanded without a target. */ |
| if (TREE_CODE (newrhs) == TARGET_EXPR) |
| newrhs = build2 (COMPOUND_EXPR, TREE_TYPE (newrhs), newrhs, |
| TREE_OPERAND (newrhs, 0)); |
| } |
| |
| if (newrhs == error_mark_node) |
| return error_mark_node; |
| |
| if (c_dialect_objc () && flag_objc_gc) |
| { |
| result = objc_generate_write_barrier (lhs, modifycode, newrhs); |
| |
| if (result) |
| return result; |
| } |
| |
| result = build2 (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, |
| lhstype, lhs, newrhs); |
| |
| TREE_SIDE_EFFECTS (result) = 1; |
| if (!plain_assign) |
| TREE_NO_WARNING (result) = 1; |
| |
| return result; |
| } |
| |
| tree |
| build_x_modify_expr (location_t loc, tree lhs, enum tree_code modifycode, |
| tree rhs, tsubst_flags_t complain) |
| { |
| if (processing_template_decl) |
| return build_min_nt_loc (loc, MODOP_EXPR, lhs, |
| build_min_nt_loc (loc, modifycode, NULL_TREE, |
| NULL_TREE), rhs); |
| |
| if (modifycode != NOP_EXPR) |
| { |
| tree rval = build_new_op (loc, MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, |
| make_node (modifycode), /*overload=*/NULL, |
| complain); |
| if (rval) |
| { |
| TREE_NO_WARNING (rval) = 1; |
| return rval; |
| } |
| } |
| return cp_build_modify_expr (lhs, modifycode, rhs, complain); |
| } |
| |
| /* Helper function for get_delta_difference which assumes FROM is a base |
| class of TO. Returns a delta for the conversion of pointer-to-member |
| of FROM to pointer-to-member of TO. If the conversion is invalid and |
| tf_error is not set in COMPLAIN returns error_mark_node, otherwise |
| returns zero. If FROM is not a base class of TO, returns NULL_TREE. |
| If C_CAST_P is true, this conversion is taking place as part of a |
| C-style cast. */ |
| |
| static tree |
| get_delta_difference_1 (tree from, tree to, bool c_cast_p, |
| tsubst_flags_t complain) |
| { |
| tree binfo; |
| base_kind kind; |
| |
| binfo = lookup_base (to, from, c_cast_p ? ba_unique : ba_check, |
| &kind, complain); |
| |
| if (binfo == error_mark_node) |
| { |
| if (!(complain & tf_error)) |
| return error_mark_node; |
| |
| error (" in pointer to member function conversion"); |
| return size_zero_node; |
| } |
| else if (binfo) |
| { |
| if (kind != bk_via_virtual) |
| return BINFO_OFFSET (binfo); |
| else |
| /* FROM is a virtual base class of TO. Issue an error or warning |
| depending on whether or not this is a reinterpret cast. */ |
| { |
| if (!(complain & tf_error)) |
| return error_mark_node; |
| |
| error ("pointer to member conversion via virtual base %qT", |
| BINFO_TYPE (binfo_from_vbase (binfo))); |
| |
| return size_zero_node; |
| } |
| } |
| else |
| return NULL_TREE; |
| } |
| |
| /* Get difference in deltas for different pointer to member function |
| types. If the conversion is invalid and tf_error is not set in |
| COMPLAIN, returns error_mark_node, otherwise returns an integer |
| constant of type PTRDIFF_TYPE_NODE and its value is zero if the |
| conversion is invalid. If ALLOW_INVERSE_P is true, then allow reverse |
| conversions as well. If C_CAST_P is true this conversion is taking |
| place as part of a C-style cast. |
| |
| Note that the naming of FROM and TO is kind of backwards; the return |
| value is what we add to a TO in order to get a FROM. They are named |
| this way because we call this function to find out how to convert from |
| a pointer to member of FROM to a pointer to member of TO. */ |
| |
| static tree |
| get_delta_difference (tree from, tree to, |
| bool allow_inverse_p, |
| bool c_cast_p, tsubst_flags_t complain) |
| { |
| tree result; |
| |
| if (same_type_ignoring_top_level_qualifiers_p (from, to)) |
| /* Pointer to member of incomplete class is permitted*/ |
| result = size_zero_node; |
| else |
| result = get_delta_difference_1 (from, to, c_cast_p, complain); |
| |
| if (result == error_mark_node) |
| return error_mark_node; |
| |
| if (!result) |
| { |
| if (!allow_inverse_p) |
| { |
| if (!(complain & tf_error)) |
| return error_mark_node; |
| |
| error_not_base_type (from, to); |
| error (" in pointer to member conversion"); |
| result = size_zero_node; |
| } |
| else |
| { |
| result = get_delta_difference_1 (to, from, c_cast_p, complain); |
| |
| if (result == error_mark_node) |
| return error_mark_node; |
| |
| if (result) |
| result = size_diffop_loc (input_location, |
| size_zero_node, result); |
| else |
| { |
| if (!(complain & tf_error)) |
| return error_mark_node; |
| |
| error_not_base_type (from, to); |
| error (" in pointer to member conversion"); |
| result = size_zero_node; |
| } |
| } |
| } |
| |
| return fold_if_not_in_template (convert_to_integer (ptrdiff_type_node, |
| result)); |
| } |
| |
| /* Return a constructor for the pointer-to-member-function TYPE using |
| the other components as specified. */ |
| |
| tree |
| build_ptrmemfunc1 (tree type, tree delta, tree pfn) |
| { |
| tree u = NULL_TREE; |
| tree delta_field; |
| tree pfn_field; |
| vec<constructor_elt, va_gc> *v; |
| |
| /* Pull the FIELD_DECLs out of the type. */ |
| pfn_field = TYPE_FIELDS (type); |
| delta_field = DECL_CHAIN (pfn_field); |
| |
| /* Make sure DELTA has the type we want. */ |
| delta = convert_and_check (delta_type_node, delta); |
| |
| /* Convert to the correct target type if necessary. */ |
| pfn = fold_convert (TREE_TYPE (pfn_field), pfn); |
| |
| /* Finish creating the initializer. */ |
| vec_alloc (v, 2); |
| CONSTRUCTOR_APPEND_ELT(v, pfn_field, pfn); |
| CONSTRUCTOR_APPEND_ELT(v, delta_field, delta); |
| u = build_constructor (type, v); |
| TREE_CONSTANT (u) = TREE_CONSTANT (pfn) & TREE_CONSTANT (delta); |
| TREE_STATIC (u) = (TREE_CONSTANT (u) |
| && (initializer_constant_valid_p (pfn, TREE_TYPE (pfn)) |
| != NULL_TREE) |
| && (initializer_constant_valid_p (delta, TREE_TYPE (delta)) |
| != NULL_TREE)); |
| return u; |
| } |
| |
| /* Build a constructor for a pointer to member function. It can be |
| used to initialize global variables, local variable, or used |
| as a value in expressions. TYPE is the POINTER to METHOD_TYPE we |
| want to be. |
| |
| If FORCE is nonzero, then force this conversion, even if |
| we would rather not do it. Usually set when using an explicit |
| cast. A C-style cast is being processed iff C_CAST_P is true. |
| |
| Return error_mark_node, if something goes wrong. */ |
| |
| tree |
| build_ptrmemfunc (tree type, tree pfn, int force, bool c_cast_p, |
| tsubst_flags_t complain) |
| { |
| tree fn; |
| tree pfn_type; |
| tree to_type; |
| |
| if (error_operand_p (pfn)) |
| return error_mark_node; |
| |
| pfn_type = TREE_TYPE (pfn); |
| to_type = build_ptrmemfunc_type (type); |
| |
| /* Handle multiple conversions of pointer to member functions. */ |
| if (TYPE_PTRMEMFUNC_P (pfn_type)) |
| { |
| tree delta = NULL_TREE; |
| tree npfn = NULL_TREE; |
| tree n; |
| |
| if (!force |
| && !can_convert_arg (to_type, TREE_TYPE (pfn), pfn, |
| LOOKUP_NORMAL, complain)) |
| error ("invalid conversion to type %qT from type %qT", |
| to_type, pfn_type); |
| |
| n = get_delta_difference (TYPE_PTRMEMFUNC_OBJECT_TYPE (pfn_type), |
| TYPE_PTRMEMFUNC_OBJECT_TYPE (to_type), |
| force, |
| c_cast_p, complain); |
| if (n == error_mark_node) |
| return error_mark_node; |
| |
| /* We don't have to do any conversion to convert a |
| pointer-to-member to its own type. But, we don't want to |
| just return a PTRMEM_CST if there's an explicit cast; that |
| cast should make the expression an invalid template argument. */ |
| if (TREE_CODE (pfn) != PTRMEM_CST) |
| { |
| if (same_type_p (to_type, pfn_type)) |
| return pfn; |
| else if (integer_zerop (n)) |
| return build_reinterpret_cast (to_type, pfn, |
| complain); |
| } |
| |
| if (TREE_SIDE_EFFECTS (pfn)) |
| pfn = save_expr (pfn); |
| |
| /* Obtain the function pointer and the current DELTA. */ |
| if (TREE_CODE (pfn) == PTRMEM_CST) |
| expand_ptrmemfunc_cst (pfn, &delta, &npfn); |
| else |
| { |
| npfn = build_ptrmemfunc_access_expr (pfn, pfn_identifier); |
| delta = build_ptrmemfunc_access_expr (pfn, delta_identifier); |
| } |
| |
| /* Just adjust the DELTA field. */ |
| gcc_assert (same_type_ignoring_top_level_qualifiers_p |
| (TREE_TYPE (delta), ptrdiff_type_node)); |
| if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_delta) |
| n = cp_build_binary_op (input_location, |
| LSHIFT_EXPR, n, integer_one_node, |
| complain); |
| delta = cp_build_binary_op (input_location, |
| PLUS_EXPR, delta, n, complain); |
| return build_ptrmemfunc1 (to_type, delta, npfn); |
| } |
| |
| /* Handle null pointer to member function conversions. */ |
| if (null_ptr_cst_p (pfn)) |
| { |
| pfn = cp_build_c_cast (type, pfn, complain); |
| return build_ptrmemfunc1 (to_type, |
| integer_zero_node, |
| pfn); |
| } |
| |
| if (type_unknown_p (pfn)) |
| return instantiate_type (type, pfn, complain); |
| |
| fn = TREE_OPERAND (pfn, 0); |
| gcc_assert (TREE_CODE (fn) == FUNCTION_DECL |
| /* In a template, we will have preserved the |
| OFFSET_REF. */ |
| || (processing_template_decl && TREE_CODE (fn) == OFFSET_REF)); |
| return make_ptrmem_cst (to_type, fn); |
| } |
| |
| /* Return the DELTA, IDX, PFN, and DELTA2 values for the PTRMEM_CST |
| given by CST. |
| |
| ??? There is no consistency as to the types returned for the above |
| values. Some code acts as if it were a sizetype and some as if it were |
| integer_type_node. */ |
| |
| void |
| expand_ptrmemfunc_cst (tree cst, tree *delta, tree *pfn) |
| { |
| tree type = TREE_TYPE (cst); |
| tree fn = PTRMEM_CST_MEMBER (cst); |
| tree ptr_class, fn_class; |
| |
| gcc_assert (TREE_CODE (fn) == FUNCTION_DECL); |
| |
| /* The class that the function belongs to. */ |
| fn_class = DECL_CONTEXT (fn); |
| |
| /* The class that we're creating a pointer to member of. */ |
| ptr_class = TYPE_PTRMEMFUNC_OBJECT_TYPE (type); |
| |
| /* First, calculate the adjustment to the function's class. */ |
| *delta = get_delta_difference (fn_class, ptr_class, /*force=*/0, |
| /*c_cast_p=*/0, tf_warning_or_error); |
| |
| if (!DECL_VIRTUAL_P (fn)) |
| *pfn = convert (TYPE_PTRMEMFUNC_FN_TYPE (type), |
| build_addr_func (fn, tf_warning_or_error)); |
| else |
| { |
| /* If we're dealing with a virtual function, we have to adjust 'this' |
| again, to point to the base which provides the vtable entry for |
| fn; the call will do the opposite adjustment. */ |
| tree orig_class = DECL_CONTEXT (fn); |
| tree binfo = binfo_or_else (orig_class, fn_class); |
| *delta = build2 (PLUS_EXPR, TREE_TYPE (*delta), |
| *delta, BINFO_OFFSET (binfo)); |
| *delta = fold_if_not_in_template (*delta); |
| |
| /* We set PFN to the vtable offset at which the function can be |
| found, plus one (unless ptrmemfunc_vbit_in_delta, in which |
| case delta is shifted left, and then incremented). */ |
| *pfn = DECL_VINDEX (fn); |
| *pfn = build2 (MULT_EXPR, integer_type_node, *pfn, |
| TYPE_SIZE_UNIT (vtable_entry_type)); |
| *pfn = fold_if_not_in_template (*pfn); |
| |
| switch (TARGET_PTRMEMFUNC_VBIT_LOCATION) |
| { |
| case ptrmemfunc_vbit_in_pfn: |
| *pfn = build2 (PLUS_EXPR, integer_type_node, *pfn, |
| integer_one_node); |
| *pfn = fold_if_not_in_template (*pfn); |
| break; |
| |
| case ptrmemfunc_vbit_in_delta: |
| *delta = build2 (LSHIFT_EXPR, TREE_TYPE (*delta), |
| *delta, integer_one_node); |
| *delta = fold_if_not_in_template (*delta); |
| *delta = build2 (PLUS_EXPR, TREE_TYPE (*delta), |
| *delta, integer_one_node); |
| *delta = fold_if_not_in_template (*delta); |
| break; |
| |
| default: |
| gcc_unreachable (); |
| } |
| |
| *pfn = build_nop (TYPE_PTRMEMFUNC_FN_TYPE (type), *pfn); |
| *pfn = fold_if_not_in_template (*pfn); |
| } |
| } |
| |
| /* Return an expression for PFN from the pointer-to-member function |
| given by T. */ |
| |
| static tree |
| pfn_from_ptrmemfunc (tree t) |
| { |
| if (TREE_CODE (t) == PTRMEM_CST) |
| { |
| tree delta; |
| tree pfn; |
| |
| expand_ptrmemfunc_cst (t, &delta, &pfn); |
| if (pfn) |
| return pfn; |
| } |
| |
| return build_ptrmemfunc_access_expr (t, pfn_identifier); |
| } |
| |
| /* Return an expression for DELTA from the pointer-to-member function |
| given by T. */ |
| |
| static tree |
| delta_from_ptrmemfunc (tree t) |
| { |
| if (TREE_CODE (t) == PTRMEM_CST) |
| { |
| tree delta; |
| tree pfn; |
| |
| expand_ptrmemfunc_cst (t, &delta, &pfn); |
| if (delta) |
| return delta; |
| } |
| |
| return build_ptrmemfunc_access_expr (t, delta_identifier); |
| } |
| |
| /* Convert value RHS to type TYPE as preparation for an assignment to |
| an lvalue of type TYPE. ERRTYPE indicates what kind of error the |
| implicit conversion is. If FNDECL is non-NULL, we are doing the |
| conversion in order to pass the PARMNUMth argument of FNDECL. |
| If FNDECL is NULL, we are doing the conversion in function pointer |
| argument passing, conversion in initialization, etc. */ |
| |
| static tree |
| convert_for_assignment (tree type, tree rhs, |
| impl_conv_rhs errtype, tree fndecl, int parmnum, |
| tsubst_flags_t complain, int flags) |
| { |
| tree rhstype; |
| enum tree_code coder; |
| |
| /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ |
| if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
| rhs = TREE_OPERAND (rhs, 0); |
| |
| rhstype = TREE_TYPE (rhs); |
| coder = TREE_CODE (rhstype); |
| |
| if (TREE_CODE (type) == VECTOR_TYPE && coder == VECTOR_TYPE |
| && vector_types_convertible_p (type, rhstype, true)) |
| { |
| rhs = mark_rvalue_use (rhs); |
| return convert (type, rhs); |
| } |
| |
| if (rhs == error_mark_node || rhstype == error_mark_node) |
| return error_mark_node; |
| if (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node) |
| return error_mark_node; |
| |
| /* The RHS of an assignment cannot have void type. */ |
| if (coder == VOID_TYPE) |
| { |
| if (complain & tf_error) |
| error ("void value not ignored as it ought to be"); |
| return error_mark_node; |
| } |
| |
| if (c_dialect_objc ()) |
| { |
| int parmno; |
| tree selector; |
| tree rname = fndecl; |
| |
| switch (errtype) |
| { |
| case ICR_ASSIGN: |
| parmno = -1; |
| break; |
| case ICR_INIT: |
| parmno = -2; |
| break; |
| default: |
| selector = objc_message_selector (); |
| parmno = parmnum; |
| if (selector && parmno > 1) |
| { |
| rname = selector; |
| parmno -= 1; |
| } |
| } |
| |
| if (objc_compare_types (type, rhstype, parmno, rname)) |
| { |
| rhs = mark_rvalue_use (rhs); |
| return convert (type, rhs); |
| } |
| } |
| |
| /* [expr.ass] |
| |
| The expression is implicitly converted (clause _conv_) to the |
| cv-unqualified type of the left operand. |
| |
| We allow bad conversions here because by the time we get to this point |
| we are committed to doing the conversion. If we end up doing a bad |
| conversion, convert_like will complain. */ |
| if (!can_convert_arg_bad (type, rhstype, rhs, flags, complain)) |
| { |
| /* When -Wno-pmf-conversions is use, we just silently allow |
| conversions from pointers-to-members to plain pointers. If |
| the conversion doesn't work, cp_convert will complain. */ |
| if (!warn_pmf2ptr |
| && TYPE_PTR_P (type) |
| && TYPE_PTRMEMFUNC_P (rhstype)) |
| rhs = cp_convert (strip_top_quals (type), rhs, complain); |
| else |
| { |
| if (complain & tf_error) |
| { |
| /* If the right-hand side has unknown type, then it is an |
| overloaded function. Call instantiate_type to get error |
| messages. */ |
| if (rhstype == unknown_type_node) |
| instantiate_type (type, rhs, tf_warning_or_error); |
| else if (fndecl) |
| error ("cannot convert %qT to %qT for argument %qP to %qD", |
| rhstype, type, parmnum, fndecl); |
| else |
| switch (errtype) |
| { |
| case ICR_DEFAULT_ARGUMENT: |
| error ("cannot convert %qT to %qT in default argument", |
| rhstype, type); |
| break; |
| case ICR_ARGPASS: |
| error ("cannot convert %qT to %qT in argument passing", |
| rhstype, type); |
| break; |
| case ICR_CONVERTING: |
| error ("cannot convert %qT to %qT", |
| rhstype, type); |
| break; |
| case ICR_INIT: |
| error ("cannot convert %qT to %qT in initialization", |
| rhstype, type); |
| break; |
| case ICR_RETURN: |
| error ("cannot convert %qT to %qT in return", |
| rhstype, type); |
| break; |
| case ICR_ASSIGN: |
| error ("cannot convert %qT to %qT in assignment", |
| rhstype, type); |
| break; |
| default: |
| gcc_unreachable(); |
| } |
| } |
| return error_mark_node; |
| } |
| } |
| if (warn_suggest_attribute_format) |
| { |
| const enum tree_code codel = TREE_CODE (type); |
| if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE) |
| && coder == codel |
| && check_missing_format_attribute (type, rhstype) |
| && (complain & tf_warning)) |
| switch (errtype) |
| { |
| case ICR_ARGPASS: |
| case ICR_DEFAULT_ARGUMENT: |
| if (fndecl) |
| warning (OPT_Wsuggest_attribute_format, |
| "parameter %qP of %qD might be a candidate " |
| "for a format attribute", parmnum, fndecl); |
| else |
| warning (OPT_Wsuggest_attribute_format, |
| "parameter might be a candidate " |
| "for a format attribute"); |
| break; |
| case ICR_CONVERTING: |
| warning (OPT_Wsuggest_attribute_format, |
| "target of conversion might be a candidate " |
| "for a format attribute"); |
| break; |
| case ICR_INIT: |
| warning (OPT_Wsuggest_attribute_format, |
| "target of initialization might be a candidate " |
| "for a format attribute"); |
| break; |
| case ICR_RETURN: |
| warning (OPT_Wsuggest_attribute_format, |
| "return type might be a candidate " |
| "for a format attribute"); |
| break; |
| case ICR_ASSIGN: |
| warning (OPT_Wsuggest_attribute_format, |
| "left-hand side of assignment might be a candidate " |
| "for a format attribute"); |
| break; |
| default: |
| gcc_unreachable(); |
| } |
| } |
| |
| /* If -Wparentheses, warn about a = b = c when a has type bool and b |
| does not. */ |
| if (warn_parentheses |
| && TREE_CODE (type) == BOOLEAN_TYPE |
| && TREE_CODE (rhs) == MODIFY_EXPR |
| && !TREE_NO_WARNING (rhs) |
| && TREE_CODE (TREE_TYPE (rhs)) != BOOLEAN_TYPE |
| && (complain & tf_warning)) |
| { |
| location_t loc = EXPR_LOC_OR_HERE (rhs); |
| |
| warning_at (loc, OPT_Wparentheses, |
| "suggest parentheses around assignment used as truth value"); |
| TREE_NO_WARNING (rhs) = 1; |
| } |
| |
| return perform_implicit_conversion_flags (strip_top_quals (type), rhs, |
| complain, flags); |
| } |
| |
| /* Convert RHS to be of type TYPE. |
| If EXP is nonzero, it is the target of the initialization. |
| ERRTYPE indicates what kind of error the implicit conversion is. |
| |
| Two major differences between the behavior of |
| `convert_for_assignment' and `convert_for_initialization' |
| are that references are bashed in the former, while |
| copied in the latter, and aggregates are assigned in |
| the former (operator=) while initialized in the |
| latter (X(X&)). |
| |
| If using constructor make sure no conversion operator exists, if one does |
| exist, an ambiguity exists. */ |
| |
| tree |
| convert_for_initialization (tree exp, tree type, tree rhs, int flags, |
| impl_conv_rhs errtype, tree fndecl, int parmnum, |
| tsubst_flags_t complain) |
| { |
| enum tree_code codel = TREE_CODE (type); |
| tree rhstype; |
| enum tree_code coder; |
| |
| /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
| Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */ |
| if (TREE_CODE (rhs) == NOP_EXPR |
| && TREE_TYPE (rhs) == TREE_TYPE (TREE_OPERAND (rhs, 0)) |
| && codel != REFERENCE_TYPE) |
| rhs = TREE_OPERAND (rhs, 0); |
| |
| if (type == error_mark_node |
| || rhs == error_mark_node |
| || (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node)) |
| return error_mark_node; |
| |
| if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE |
| && TREE_CODE (type) != ARRAY_TYPE |
| && (TREE_CODE (type) != REFERENCE_TYPE |
| || TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE)) |
| || (TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE |
| && (TREE_CODE (type) != REFERENCE_TYPE |
| || TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE)) |
| || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) |
| rhs = decay_conversion (rhs, complain); |
| |
| rhstype = TREE_TYPE (rhs); |
| coder = TREE_CODE (rhstype); |
| |
| if (coder == ERROR_MARK) |
| return error_mark_node; |
| |
| /* We accept references to incomplete types, so we can |
| return here before checking if RHS is of complete type. */ |
| |
| if (codel == REFERENCE_TYPE) |
| { |
| /* This should eventually happen in convert_arguments. */ |
| int savew = 0, savee = 0; |
| |
| if (fndecl) |
| savew = warningcount, savee = errorcount; |
| rhs = initialize_reference (type, rhs, flags, complain); |
| if (fndecl) |
| { |
| if (warningcount > savew) |
| warning (0, "in passing argument %P of %q+D", parmnum, fndecl); |
| else if (errorcount > savee) |
| error ("in passing argument %P of %q+D", parmnum, fndecl); |
| } |
| return rhs; |
| } |
| |
| if (exp != 0) |
| exp = require_complete_type_sfinae (exp, complain); |
| if (exp == error_mark_node) |
| return error_mark_node; |
| |
| rhstype = non_reference (rhstype); |
| |
| type = complete_type (type); |
| |
| if (DIRECT_INIT_EXPR_P (type, rhs)) |
| /* Don't try to do copy-initialization if we already have |
| direct-initialization. */ |
| return rhs; |
| |
| if (MAYBE_CLASS_TYPE_P (type)) |
| return perform_implicit_conversion_flags (type, rhs, complain, flags); |
| |
| return convert_for_assignment (type, rhs, errtype, fndecl, parmnum, |
| complain, flags); |
| } |
| |
| /* If RETVAL is the address of, or a reference to, a local variable or |
| temporary give an appropriate warning. */ |
| |
| static void |
| maybe_warn_about_returning_address_of_local (tree retval) |
| { |
| tree valtype = TREE_TYPE (DECL_RESULT (current_function_decl)); |
| tree whats_returned = retval; |
| |
| for (;;) |
| { |
| if (TREE_CODE (whats_returned) == COMPOUND_EXPR) |
| whats_returned = TREE_OPERAND (whats_returned, 1); |
| else if (CONVERT_EXPR_P (whats_returned) |
| || TREE_CODE (whats_returned) == NON_LVALUE_EXPR) |
| whats_returned = TREE_OPERAND (whats_returned, 0); |
| else |
| break; |
| } |
| |
| if (TREE_CODE (whats_returned) != ADDR_EXPR) |
| return; |
| whats_returned = TREE_OPERAND (whats_returned, 0); |
| |
| if (TREE_CODE (valtype) == REFERENCE_TYPE) |
| { |
| if (TREE_CODE (whats_returned) == AGGR_INIT_EXPR |
| || TREE_CODE (whats_returned) == TARGET_EXPR) |
| { |
| warning (OPT_Wreturn_local_addr, "returning reference to temporary"); |
| return; |
| } |
| if (TREE_CODE (whats_returned) == VAR_DECL |
| && DECL_NAME (whats_returned) |
| && TEMP_NAME_P (DECL_NAME (whats_returned))) |
| { |
| warning (OPT_Wreturn_local_addr, "reference to non-lvalue returned"); |
| return; |
| } |
| } |
| |
| while (TREE_CODE (whats_returned) == COMPONENT_REF |
| || TREE_CODE (whats_returned) == ARRAY_REF) |
| whats_returned = TREE_OPERAND (whats_returned, 0); |
| |
| if (DECL_P (whats_returned) |
| && DECL_NAME (whats_returned) |
| && DECL_FUNCTION_SCOPE_P (whats_returned) |
| && !(TREE_STATIC (whats_returned) |
| || TREE_PUBLIC (whats_returned))) |
| { |
| if (TREE_CODE (valtype) == REFERENCE_TYPE) |
| warning (OPT_Wreturn_local_addr, "reference to local variable %q+D returned", |
| whats_returned); |
| else |
| warning (OPT_Wreturn_local_addr, "address of local variable %q+D returned", |
| whats_returned); |
| return; |
| } |
| } |
| |
| /* Check that returning RETVAL from the current function is valid. |
| Return an expression explicitly showing all conversions required to |
| change RETVAL into the function return type, and to assign it to |
| the DECL_RESULT for the function. Set *NO_WARNING to true if |
| code reaches end of non-void function warning shouldn't be issued |
| on this RETURN_EXPR. */ |
| |
| tree |
| check_return_expr (tree retval, bool *no_warning) |
| { |
| tree result; |
| /* The type actually returned by the function. */ |
| tree valtype; |
| /* The type the function is declared to return, or void if |
| the declared type is incomplete. */ |
| tree functype; |
| int fn_returns_value_p; |
| bool named_return_value_okay_p; |
| |
| *no_warning = false; |
| |
| /* A `volatile' function is one that isn't supposed to return, ever. |
| (This is a G++ extension, used to get better code for functions |
| that call the `volatile' function.) */ |
| if (TREE_THIS_VOLATILE (current_function_decl)) |
| warning (0, "function declared %<noreturn%> has a %<return%> statement"); |
| |
| /* Check for various simple errors. */ |
| if (DECL_DESTRUCTOR_P (current_function_decl)) |
| { |
| if (retval) |
| error ("returning a value from a destructor"); |
| return NULL_TREE; |
| } |
| else if (DECL_CONSTRUCTOR_P (current_function_decl)) |
| { |
| if (in_function_try_handler) |
| /* If a return statement appears in a handler of the |
| function-try-block of a constructor, the program is ill-formed. */ |
| error ("cannot return from a handler of a function-try-block of a constructor"); |
| else if (retval) |
| /* You can't return a value from a constructor. */ |
| error ("returning a value from a constructor"); |
| return NULL_TREE; |
| } |
| |
| if (processing_template_decl) |
| { |
| current_function_returns_value = 1; |
| if (check_for_bare_parameter_packs (retval)) |
| retval = error_mark_node; |
| return retval; |
| } |
| |
| functype = TREE_TYPE (TREE_TYPE (current_function_decl)); |
| |
| /* Deduce auto return type from a return statement. */ |
| if (current_function_auto_return_pattern) |
| { |
| tree auto_node; |
| tree type; |
| |
| if (!retval && !is_auto (current_function_auto_return_pattern)) |
| { |
| /* Give a helpful error message. */ |
| error ("return-statement with no value, in function returning %qT", |
| current_function_auto_return_pattern); |
| inform (input_location, "only plain %<auto%> return type can be " |
| "deduced to %<void%>"); |
| type = error_mark_node; |
| } |
| else if (retval && BRACE_ENCLOSED_INITIALIZER_P (retval)) |
| { |
| error ("returning initializer list"); |
| type = error_mark_node; |
| } |
| else |
| { |
| if (!retval) |
| retval = void_zero_node; |
| auto_node = type_uses_auto (current_function_auto_return_pattern); |
| type = do_auto_deduction (current_function_auto_return_pattern, |
| retval, auto_node); |
| } |
| |
| if (type == error_mark_node) |
| /* Leave it. */; |
| else if (functype == current_function_auto_return_pattern) |
| apply_deduced_return_type (current_function_decl, type); |
| else |
| /* A mismatch should have been diagnosed in do_auto_deduction. */ |
| gcc_assert (same_type_p (type, functype)); |
| functype = type; |
| } |
| |
| /* When no explicit return-value is given in a function with a named |
| return value, the named return value is used. */ |
| result = DECL_RESULT (current_function_decl); |
| valtype = TREE_TYPE (result); |
| gcc_assert (valtype != NULL_TREE); |
| fn_returns_value_p = !VOID_TYPE_P (valtype); |
| if (!retval && DECL_NAME (result) && fn_returns_value_p) |
| retval = result; |
| |
| /* Check for a return statement with no return value in a function |
| that's supposed to return a value. */ |
| if (!retval && fn_returns_value_p) |
| { |
| if (functype != error_mark_node) |
| permerror (input_location, "return-statement with no value, in " |
| "function returning %qT", valtype); |
| /* Remember that this function did return. */ |
| current_function_returns_value = 1; |
| /* And signal caller that TREE_NO_WARNING should be set on the |
| RETURN_EXPR to avoid control reaches end of non-void function |
| warnings in tree-cfg.c. */ |
| *no_warning = true; |
| } |
| /* Check for a return statement with a value in a function that |
| isn't supposed to return a value. */ |
| else if (retval && !fn_returns_value_p) |
| { |
| if (VOID_TYPE_P (TREE_TYPE (retval))) |
| /* You can return a `void' value from a function of `void' |
| type. In that case, we have to evaluate the expression for |
| its side-effects. */ |
| finish_expr_stmt (retval); |
| else |
| permerror (input_location, "return-statement with a value, in function " |
| "returning 'void'"); |
| current_function_returns_null = 1; |
| |
| /* There's really no value to return, after all. */ |
| return NULL_TREE; |
| } |
| else if (!retval) |
| /* Remember that this function can sometimes return without a |
| value. */ |
| current_function_returns_null = 1; |
| else |
| /* Remember that this function did return a value. */ |
| current_function_returns_value = 1; |
| |
| /* Check for erroneous operands -- but after giving ourselves a |
| chance to provide an error about returning a value from a void |
| function. */ |
| if (error_operand_p (retval)) |
| { |
| current_function_return_value = error_mark_node; |
| return error_mark_node; |
| } |
| |
| /* Only operator new(...) throw(), can return NULL [expr.new/13]. */ |
| if ((DECL_OVERLOADED_OPERATOR_P (current_function_decl) == NEW_EXPR |
| || DECL_OVERLOADED_OPERATOR_P (current_function_decl) == VEC_NEW_EXPR) |
| && !TYPE_NOTHROW_P (TREE_TYPE (current_function_decl)) |
| && ! flag_check_new |
| && retval && null_ptr_cst_p (retval)) |
| warning (0, "%<operator new%> must not return NULL unless it is " |
| "declared %<throw()%> (or -fcheck-new is in effect)"); |
| |
| /* Effective C++ rule 15. See also start_function. */ |
| if (warn_ecpp |
| && DECL_NAME (current_function_decl) == ansi_assopname(NOP_EXPR)) |
| { |
| bool warn = true; |
| |
| /* The function return type must be a reference to the current |
| class. */ |
| if (TREE_CODE (valtype) == REFERENCE_TYPE |
| && same_type_ignoring_top_level_qualifiers_p |
| (TREE_TYPE (valtype), TREE_TYPE (current_class_ref))) |
| { |
| /* Returning '*this' is obviously OK. */ |
| if (retval == current_class_ref) |
| warn = false; |
| /* If we are calling a function whose return type is the same of |
| the current class reference, it is ok. */ |
| else if (TREE_CODE (retval) == INDIRECT_REF |
| && TREE_CODE (TREE_OPERAND (retval, 0)) == CALL_EXPR) |
| warn = false; |
| } |
| |
| if (warn) |
| warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>"); |
| } |
| |
| /* The fabled Named Return Value optimization, as per [class.copy]/15: |
| |
| [...] For a function with a class return type, if the expression |
| in the return statement is the name of a local object, and the cv- |
| unqualified type of the local object is the same as the function |
| return type, an implementation is permitted to omit creating the tem- |
| porary object to hold the function return value [...] |
| |
| So, if this is a value-returning function that always returns the same |
| local variable, remember it. |
| |
| It might be nice to be more flexible, and choose the first suitable |
| variable even if the function sometimes returns something else, but |
| then we run the risk of clobbering the variable we chose if the other |
| returned expression uses the chosen variable somehow. And people expect |
| this restriction, anyway. (jason 2000-11-19) |
| |
| See finish_function and finalize_nrv for the rest of this optimization. */ |
| |
| named_return_value_okay_p = |
| (retval != NULL_TREE |
| /* Must be a local, automatic variable. */ |
| && TREE_CODE (retval) == VAR_DECL |
| && DECL_CONTEXT (retval) == current_function_decl |
| && ! TREE_STATIC (retval) |
| /* And not a lambda or anonymous union proxy. */ |
| && !DECL_HAS_VALUE_EXPR_P (retval) |
| && (DECL_ALIGN (retval) >= DECL_ALIGN (result)) |
| /* The cv-unqualified type of the returned value must be the |
| same as the cv-unqualified return type of the |
| function. */ |
| && same_type_p ((TYPE_MAIN_VARIANT (TREE_TYPE (retval))), |
| (TYPE_MAIN_VARIANT (functype))) |
| /* And the returned value must be non-volatile. */ |
| && ! TYPE_VOLATILE (TREE_TYPE (retval))); |
| |
| if (fn_returns_value_p && flag_elide_constructors) |
| { |
| if (named_return_value_okay_p |
| && (current_function_return_value == NULL_TREE |
| || current_function_return_value == retval)) |
| current_function_return_value = retval; |
| else |
| current_function_return_value = error_mark_node; |
| } |
| |
| /* We don't need to do any conversions when there's nothing being |
| returned. */ |
| if (!retval) |
| return NULL_TREE; |
| |
| /* Do any required conversions. */ |
| if (retval == result || DECL_CONSTRUCTOR_P (current_function_decl)) |
| /* No conversions are required. */ |
| ; |
| else |
| { |
| int flags = LOOKUP_NORMAL | LOOKUP_ONLYCONVERTING; |
| |
| /* The functype's return type will have been set to void, if it |
| was an incomplete type. Just treat this as 'return;' */ |
| if (VOID_TYPE_P (functype)) |
| return error_mark_node; |
| |
| /* Under C++0x [12.8/16 class.copy], a returned lvalue is sometimes |
| treated as an rvalue for the purposes of overload resolution to |
| favor move constructors over copy constructors. |
| |
| Note that these conditions are similar to, but not as strict as, |
| the conditions for the named return value optimization. */ |
| if ((cxx_dialect != cxx98) |
| && ((TREE_CODE (retval) == VAR_DECL |
| && !DECL_HAS_VALUE_EXPR_P (retval)) |
| || TREE_CODE (retval) == PARM_DECL) |
| && DECL_CONTEXT (retval) == current_function_decl |
| && !TREE_STATIC (retval) |
| && same_type_p ((TYPE_MAIN_VARIANT (TREE_TYPE (retval))), |
| (TYPE_MAIN_VARIANT (functype))) |
| /* This is only interesting for class type. */ |
| && CLASS_TYPE_P (functype)) |
| flags = flags | LOOKUP_PREFER_RVALUE; |
| |
| /* First convert the value to the function's return type, then |
| to the type of return value's location to handle the |
| case that functype is smaller than the valtype. */ |
| retval = convert_for_initialization |
| (NULL_TREE, functype, retval, flags, ICR_RETURN, NULL_TREE, 0, |
| tf_warning_or_error); |
| retval = convert (valtype, retval); |
| |
| /* If the conversion failed, treat this just like `return;'. */ |
| if (retval == error_mark_node) |
| return retval; |
| /* We can't initialize a register from a AGGR_INIT_EXPR. */ |
| else if (! cfun->returns_struct |
| && TREE_CODE (retval) == TARGET_EXPR |
| && TREE_CODE (TREE_OPERAND (retval, 1)) == AGGR_INIT_EXPR) |
| retval = build2 (COMPOUND_EXPR, TREE_TYPE (retval), retval, |
| TREE_OPERAND (retval, 0)); |
| else |
| maybe_warn_about_returning_address_of_local (retval); |
| } |
| |
| /* Actually copy the value returned into the appropriate location. */ |
| if (retval && retval != result) |
| retval = build2 (INIT_EXPR, TREE_TYPE (result), result, retval); |
| |
| return retval; |
| } |
| |
| |
| /* Returns nonzero if the pointer-type FROM can be converted to the |
| pointer-type TO via a qualification conversion. If CONSTP is -1, |
| then we return nonzero if the pointers are similar, and the |
| cv-qualification signature of FROM is a proper subset of that of TO. |
| |
| If CONSTP is positive, then all outer pointers have been |
| const-qualified. */ |
| |
| static int |
| comp_ptr_ttypes_real (tree to, tree from, int constp) |
| { |
| bool to_more_cv_qualified = false; |
| bool is_opaque_pointer = false; |
| |
| for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) |
| { |
| if (TREE_CODE (to) != TREE_CODE (from)) |
| return 0; |
| |
| if (TREE_CODE (from) == OFFSET_TYPE |
| && !same_type_p (TYPE_OFFSET_BASETYPE (from), |
| TYPE_OFFSET_BASETYPE (to))) |
| return 0; |
| |
| /* Const and volatile mean something different for function types, |
| so the usual checks are not appropriate. */ |
| if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE) |
| { |
| if (!at_least_as_qualified_p (to, from)) |
| return 0; |
| |
| if (!at_least_as_qualified_p (from, to)) |
| { |
| if (constp == 0) |
| return 0; |
| to_more_cv_qualified = true; |
| } |
| |
| if (constp > 0) |
| constp &= TYPE_READONLY (to); |
| } |
| |
| if (TREE_CODE (to) == VECTOR_TYPE) |
| is_opaque_pointer = vector_targets_convertible_p (to, from); |
| |
| if (TREE_CODE (to) != POINTER_TYPE && !TYPE_PTRDATAMEM_P (to)) |
| return ((constp >= 0 || to_more_cv_qualified) |
| && (is_opaque_pointer |
| || same_type_ignoring_top_level_qualifiers_p (to, from))); |
| } |
| } |
| |
| /* When comparing, say, char ** to char const **, this function takes |
| the 'char *' and 'char const *'. Do not pass non-pointer/reference |
| types to this function. */ |
| |
| int |
| comp_ptr_ttypes (tree to, tree from) |
| { |
| return comp_ptr_ttypes_real (to, from, 1); |
| } |
| |
| /* Returns true iff FNTYPE is a non-class type that involves |
| error_mark_node. We can get FUNCTION_TYPE with buried error_mark_node |
| if a parameter type is ill-formed. */ |
| |
| bool |
| error_type_p (const_tree type) |
| { |
| tree t; |
| |
| switch (TREE_CODE (type)) |
| { |
| case ERROR_MARK: |
| return true; |
| |
| case POINTER_TYPE: |
| case REFERENCE_TYPE: |
| case OFFSET_TYPE: |
| return error_type_p (TREE_TYPE (type)); |
| |
| case FUNCTION_TYPE: |
| case METHOD_TYPE: |
| if (error_type_p (TREE_TYPE (type))) |
| return true; |
| for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t)) |
| if (error_type_p (TREE_VALUE (t))) |
| return true; |
| return false; |
| |
| case RECORD_TYPE: |
| if (TYPE_PTRMEMFUNC_P (type)) |
| return error_type_p (TYPE_PTRMEMFUNC_FN_TYPE (type)); |
| return false; |
| |
| default: |
| return false; |
| } |
| } |
| |
| /* Returns 1 if to and from are (possibly multi-level) pointers to the same |
| type or inheritance-related types, regardless of cv-quals. */ |
| |
| int |
| ptr_reasonably_similar (const_tree to, const_tree from) |
| { |
| for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) |
| { |
| /* Any target type is similar enough to void. */ |
| if (TREE_CODE (to) == VOID_TYPE) |
| return !error_type_p (from); |
| if (TREE_CODE (from) == VOID_TYPE) |
| return !error_type_p (to); |
| |
| if (TREE_CODE (to) != TREE_CODE (from)) |
| return 0; |
| |
| if (TREE_CODE (from) == OFFSET_TYPE |
| && comptypes (TYPE_OFFSET_BASETYPE (to), |
| TYPE_OFFSET_BASETYPE (from), |
| COMPARE_BASE | COMPARE_DERIVED)) |
| continue; |
| |
| if (TREE_CODE (to) == VECTOR_TYPE |
| && vector_types_convertible_p (to, from, false)) |
| return 1; |
| |
| if (TREE_CODE (to) == INTEGER_TYPE |
| && TYPE_PRECISION (to) == TYPE_PRECISION (from)) |
| return 1; |
| |
| if (TREE_CODE (to) == FUNCTION_TYPE) |
| return !error_type_p (to) && !error_type_p (from); |
| |
| if (TREE_CODE (to) != POINTER_TYPE) |
| return comptypes |
| (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), |
| COMPARE_BASE | COMPARE_DERIVED); |
| } |
| } |
| |
| /* Return true if TO and FROM (both of which are POINTER_TYPEs or |
| pointer-to-member types) are the same, ignoring cv-qualification at |
| all levels. */ |
| |
| bool |
| comp_ptr_ttypes_const (tree to, tree from) |
| { |
| bool is_opaque_pointer = false; |
| |
| for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) |
| { |
| if (TREE_CODE (to) != TREE_CODE (from)) |
| return false; |
| |
| if (TREE_CODE (from) == OFFSET_TYPE |
| && same_type_p (TYPE_OFFSET_BASETYPE (from), |
| TYPE_OFFSET_BASETYPE (to))) |
| continue; |
| |
| if (TREE_CODE (to) == VECTOR_TYPE) |
| is_opaque_pointer = vector_targets_convertible_p (to, from); |
| |
| if (TREE_CODE (to) != POINTER_TYPE) |
| return (is_opaque_pointer |
| || same_type_ignoring_top_level_qualifiers_p (to, from)); |
| } |
| } |
| |
| /* Returns the type qualifiers for this type, including the qualifiers on the |
| elements for an array type. */ |
| |
| int |
| cp_type_quals (const_tree type) |
| { |
| int quals; |
| /* This CONST_CAST is okay because strip_array_types returns its |
| argument unmodified and we assign it to a const_tree. */ |
| type = strip_array_types (CONST_CAST_TREE (type)); |
| if (type == error_mark_node |
| /* Quals on a FUNCTION_TYPE are memfn quals. */ |
| || TREE_CODE (type) == FUNCTION_TYPE) |
| return TYPE_UNQUALIFIED; |
| quals = TYPE_QUALS (type); |
| /* METHOD and REFERENCE_TYPEs should never have quals. */ |
| gcc_assert ((TREE_CODE (type) != METHOD_TYPE |
| && TREE_CODE (type) != REFERENCE_TYPE) |
| || ((quals & (TYPE_QUAL_CONST|TYPE_QUAL_VOLATILE)) |
| == TYPE_UNQUALIFIED)); |
| return quals; |
| } |
| |
| /* Returns the function-ref-qualifier for TYPE */ |
| |
| cp_ref_qualifier |
| type_memfn_rqual (const_tree type) |
| { |
| gcc_assert (TREE_CODE (type) == FUNCTION_TYPE |
| || TREE_CODE (type) == METHOD_TYPE); |
| |
| if (!FUNCTION_REF_QUALIFIED (type)) |
| return REF_QUAL_NONE; |
| else if (FUNCTION_RVALUE_QUALIFIED (type)) |
| return REF_QUAL_RVALUE; |
| else |
| return REF_QUAL_LVALUE; |
| } |
| |
| /* Returns the function-cv-quals for TYPE, which must be a FUNCTION_TYPE or |
| METHOD_TYPE. */ |
| |
| int |
| type_memfn_quals (const_tree type) |
| { |
| if (TREE_CODE (type) == FUNCTION_TYPE) |
| return TYPE_QUALS (type); |
| else if (TREE_CODE (type) == METHOD_TYPE) |
| return cp_type_quals (class_of_this_parm (type)); |
| else |
| gcc_unreachable (); |
| } |
| |
| /* Returns the FUNCTION_TYPE TYPE with its function-cv-quals changed to |
| MEMFN_QUALS and its ref-qualifier to RQUAL. */ |
| |
| tree |
| apply_memfn_quals (tree type, cp_cv_quals memfn_quals, cp_ref_qualifier rqual) |
| { |
| /* Could handle METHOD_TYPE here if necessary. */ |
| gcc_assert (TREE_CODE (type) == FUNCTION_TYPE); |
| if (TYPE_QUALS (type) == memfn_quals |
| && type_memfn_rqual (type) == rqual) |
| return type; |
| |
| /* This should really have a different TYPE_MAIN_VARIANT, but that gets |
| complex. */ |
| tree result = build_qualified_type (type, memfn_quals); |
| if (tree canon = TYPE_CANONICAL (result)) |
| if (canon != result) |
| /* check_qualified_type doesn't check the ref-qualifier, so make sure |
| TYPE_CANONICAL is correct. */ |
| TYPE_CANONICAL (result) |
| = build_ref_qualified_type (canon, type_memfn_rqual (result)); |
| result = build_exception_variant (result, TYPE_RAISES_EXCEPTIONS (type)); |
| return build_ref_qualified_type (result, rqual); |
| } |
| |
| /* Returns nonzero if TYPE is const or volatile. */ |
| |
| bool |
| cv_qualified_p (const_tree type) |
| { |
| int quals = cp_type_quals (type); |
| return (quals & (TYPE_QUAL_CONST|TYPE_QUAL_VOLATILE)) != 0; |
| } |
| |
| /* Returns nonzero if the TYPE contains a mutable member. */ |
| |
| bool |
| cp_has_mutable_p (const_tree type) |
| { |
| /* This CONST_CAST is okay because strip_array_types returns its |
| argument unmodified and we assign it to a const_tree. */ |
| type = strip_array_types (CONST_CAST_TREE(type)); |
| |
| return CLASS_TYPE_P (type) && CLASSTYPE_HAS_MUTABLE (type); |
| } |
| |
| /* Set TREE_READONLY and TREE_VOLATILE on DECL as indicated by the |
| TYPE_QUALS. For a VAR_DECL, this may be an optimistic |
| approximation. In particular, consider: |
| |
| int f(); |
| struct S { int i; }; |
| const S s = { f(); } |
| |
| Here, we will make "s" as TREE_READONLY (because it is declared |
| "const") -- only to reverse ourselves upon seeing that the |
| initializer is non-constant. */ |
| |
| void |
| cp_apply_type_quals_to_decl (int type_quals, tree decl) |
| { |
| tree type = TREE_TYPE (decl); |
| |
| if (type == error_mark_node) |
| return; |
| |
| if (TREE_CODE (decl) == TYPE_DECL) |
| return; |
| |
| gcc_assert (!(TREE_CODE (type) == FUNCTION_TYPE |
| && type_quals != TYPE_UNQUALIFIED)); |
| |
| /* Avoid setting TREE_READONLY incorrectly. */ |
| /* We used to check TYPE_NEEDS_CONSTRUCTING here, but now a constexpr |
| constructor can produce constant init, so rely on cp_finish_decl to |
| clear TREE_READONLY if the variable has non-constant init. */ |
| |
| /* If the type has (or might have) a mutable component, that component |
| might be modified. */ |
| if (TYPE_HAS_MUTABLE_P (type) || !COMPLETE_TYPE_P (type)) |
| type_quals &= ~TYPE_QUAL_CONST; |
| |
| c_apply_type_quals_to_decl (type_quals, decl); |
| } |
| |
| /* Subroutine of casts_away_constness. Make T1 and T2 point at |
| exemplar types such that casting T1 to T2 is casting away constness |
| if and only if there is no implicit conversion from T1 to T2. */ |
| |
| static void |
| casts_away_constness_r (tree *t1, tree *t2, tsubst_flags_t complain) |
| { |
| int quals1; |
| int quals2; |
| |
| /* [expr.const.cast] |
| |
| For multi-level pointer to members and multi-level mixed pointers |
| and pointers to members (conv.qual), the "member" aspect of a |
| pointer to member level is ignored when determining if a const |
| cv-qualifier has been cast away. */ |
| /* [expr.const.cast] |
| |
| For two pointer types: |
| |
| X1 is T1cv1,1 * ... cv1,N * where T1 is not a pointer type |
| X2 is T2cv2,1 * ... cv2,M * where T2 is not a pointer type |
| K is min(N,M) |
| |
| casting from X1 to X2 casts away constness if, for a non-pointer |
| type T there does not exist an implicit conversion (clause |
| _conv_) from: |
| |
| Tcv1,(N-K+1) * cv1,(N-K+2) * ... cv1,N * |
| |
| to |
| |
| Tcv2,(M-K+1) * cv2,(M-K+2) * ... cv2,M *. */ |
| if ((!TYPE_PTR_P (*t1) && !TYPE_PTRDATAMEM_P (*t1)) |
| || (!TYPE_PTR_P (*t2) && !TYPE_PTRDATAMEM_P (*t2))) |
| { |
| *t1 = cp_build_qualified_type (void_type_node, |
| cp_type_quals (*t1)); |
| *t2 = cp_build_qualified_type (void_type_node, |
| cp_type_quals (*t2)); |
| return; |
| } |
| |
| quals1 = cp_type_quals (*t1); |
| quals2 = cp_type_quals (*t2); |
| |
| if (TYPE_PTRDATAMEM_P (*t1)) |
| *t1 = TYPE_PTRMEM_POINTED_TO_TYPE (*t1); |
| else |
| *t1 = TREE_TYPE (*t1); |
| if (TYPE_PTRDATAMEM_P (*t2)) |
| *t2 = TYPE_PTRMEM_POINTED_TO_TYPE (*t2); |
| else |
| *t2 = TREE_TYPE (*t2); |
| |
| casts_away_constness_r (t1, t2, complain); |
| *t1 = build_pointer_type (*t1); |
| *t2 = build_pointer_type (*t2); |
| *t1 = cp_build_qualified_type (*t1, quals1); |
| *t2 = cp_build_qualified_type (*t2, quals2); |
| } |
| |
| /* Returns nonzero if casting from TYPE1 to TYPE2 casts away |
| constness. |
| |
| ??? This function returns non-zero if casting away qualifiers not |
| just const. We would like to return to the caller exactly which |
| qualifiers are casted away to give more accurate diagnostics. |
| */ |
| |
| static bool |
| casts_away_constness (tree t1, tree t2, tsubst_flags_t complain) |
| { |
| if (TREE_CODE (t2) == REFERENCE_TYPE) |
| { |
| /* [expr.const.cast] |
| |
| Casting from an lvalue of type T1 to an lvalue of type T2 |
| using a reference cast casts away constness if a cast from an |
| rvalue of type "pointer to T1" to the type "pointer to T2" |
| casts away constness. */ |
| t1 = (TREE_CODE (t1) == REFERENCE_TYPE ? TREE_TYPE (t1) : t1); |
| return casts_away_constness (build_pointer_type (t1), |
| build_pointer_type (TREE_TYPE (t2)), |
| complain); |
| } |
| |
| if (TYPE_PTRDATAMEM_P (t1) && TYPE_PTRDATAMEM_P (t2)) |
| /* [expr.const.cast] |
| |
| Casting from an rvalue of type "pointer to data member of X |
| of type T1" to the type "pointer to data member of Y of type |
| T2" casts away constness if a cast from an rvalue of type |
| "pointer to T1" to the type "pointer to T2" casts away |
| constness. */ |
| return casts_away_constness |
| (build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (t1)), |
| build_pointer_type (TYPE_PTRMEM_POINTED_TO_TYPE (t2)), |
| complain); |
| |
| /* Casting away constness is only something that makes sense for |
| pointer or reference types. */ |
| if (TREE_CODE (t1) != POINTER_TYPE |
| || TREE_CODE (t2) != POINTER_TYPE) |
| return false; |
| |
| /* Top-level qualifiers don't matter. */ |
| t1 = TYPE_MAIN_VARIANT (t1); |
| t2 = TYPE_MAIN_VARIANT (t2); |
| casts_away_constness_r (&t1, &t2, complain); |
| if (!can_convert (t2, t1, complain)) |
| return true; |
| |
| return false; |
| } |
| |
| /* If T is a REFERENCE_TYPE return the type to which T refers. |
| Otherwise, return T itself. */ |
| |
| tree |
| non_reference (tree t) |
| { |
| if (t && TREE_CODE (t) == REFERENCE_TYPE) |
| t = TREE_TYPE (t); |
| return t; |
| } |
| |
| |
| /* Return nonzero if REF is an lvalue valid for this language; |
| otherwise, print an error message and return zero. USE says |
| how the lvalue is being used and so selects the error message. */ |
| |
| int |
| lvalue_or_else (tree ref, enum lvalue_use use, tsubst_flags_t complain) |
| { |
| cp_lvalue_kind kind = lvalue_kind (ref); |
| |
| if (kind == clk_none) |
| { |
| if (complain & tf_error) |
| lvalue_error (input_location, use); |
| return 0; |
| } |
| else if (kind & (clk_rvalueref|clk_class)) |
| { |
| if (!(complain & tf_error)) |
| return 0; |
| if (kind & clk_class) |
| /* Make this a permerror because we used to accept it. */ |
| permerror (input_location, "using temporary as lvalue"); |
| else |
| error ("using xvalue (rvalue reference) as lvalue"); |
| } |
| return 1; |
| } |
| |
| /* Return true if a user-defined literal operator is a raw operator. */ |
| |
| bool |
| check_raw_literal_operator (const_tree decl) |
| { |
| tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl)); |
| tree argtype; |
| int arity; |
| bool maybe_raw_p = false; |
| |
| /* Count the number and type of arguments and check for ellipsis. */ |
| for (argtype = argtypes, arity = 0; |
| argtype && argtype != void_list_node; |
| ++arity, argtype = TREE_CHAIN (argtype)) |
| { |
| tree t = TREE_VALUE (argtype); |
| |
| if (same_type_p (t, const_string_type_node)) |
| maybe_raw_p = true; |
| } |
| if (!argtype) |
| return false; /* Found ellipsis. */ |
| |
| if (!maybe_raw_p || arity != 1) |
| return false; |
| |
| return true; |
| } |
| |
| |
| /* Return true if a user-defined literal operator has one of the allowed |
| argument types. */ |
| |
| bool |
| check_literal_operator_args (const_tree decl, |
| bool *long_long_unsigned_p, bool *long_double_p) |
| { |
| tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl)); |
| |
| *long_long_unsigned_p = false; |
| *long_double_p = false; |
| if (processing_template_decl || processing_specialization) |
| return argtypes == void_list_node; |
| else |
| { |
| tree argtype; |
| int arity; |
| int max_arity = 2; |
| |
| /* Count the number and type of arguments and check for ellipsis. */ |
| for (argtype = argtypes, arity = 0; |
| argtype && argtype != void_list_node; |
| argtype = TREE_CHAIN (argtype)) |
| { |
| tree t = TREE_VALUE (argtype); |
| ++arity; |
| |
| if (TREE_CODE (t) == POINTER_TYPE) |
| { |
| bool maybe_raw_p = false; |
| t = TREE_TYPE (t); |
| if (cp_type_quals (t) != TYPE_QUAL_CONST) |
| return false; |
| t = TYPE_MAIN_VARIANT (t); |
| if ((maybe_raw_p = same_type_p (t, char_type_node)) |
| || same_type_p (t, wchar_type_node) |
| || same_type_p (t, char16_type_node) |
| || same_type_p (t, char32_type_node)) |
| { |
| argtype = TREE_CHAIN (argtype); |
| if (!argtype) |
| return false; |
| t = TREE_VALUE (argtype); |
| if (maybe_raw_p && argtype == void_list_node) |
| return true; |
| else if (same_type_p (t, size_type_node)) |
| { |
| ++arity; |
| continue; |
| } |
| else |
| return false; |
| } |
| } |
| else if (same_type_p (t, long_long_unsigned_type_node)) |
| { |
| max_arity = 1; |
| *long_long_unsigned_p = true; |
| } |
| else if (same_type_p (t, long_double_type_node)) |
| { |
| max_arity = 1; |
| *long_double_p = true; |
| } |
| else if (same_type_p (t, char_type_node)) |
| max_arity = 1; |
| else if (same_type_p (t, wchar_type_node)) |
| max_arity = 1; |
| else if (same_type_p (t, char16_type_node)) |
| max_arity = 1; |
| else if (same_type_p (t, char32_type_node)) |
| max_arity = 1; |
| else |
| return false; |
| } |
| if (!argtype) |
| return false; /* Found ellipsis. */ |
| |
| if (arity != max_arity) |
| return false; |
| |
| return true; |
| } |
| } |