| /* Some code common to C and ObjC front ends. |
| Copyright (C) 2001 Free Software Foundation, Inc. |
| |
| 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 2, 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 COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 02111-1307, USA. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "tree.h" |
| #include "rtl.h" |
| #include "insn-config.h" |
| #include "integrate.h" |
| #include "expr.h" |
| #include "c-tree.h" |
| #include "function.h" |
| #include "flags.h" |
| #include "toplev.h" |
| #include "diagnostic.h" |
| #include "tree-inline.h" |
| #include "varray.h" |
| #include "ggc.h" |
| #include "langhooks.h" |
| #include "target.h" |
| |
| static bool c_tree_printer PARAMS ((output_buffer *, text_info *)); |
| static tree inline_forbidden_p PARAMS ((tree *, int *, void *)); |
| static void expand_deferred_fns PARAMS ((void)); |
| static tree start_cdtor PARAMS ((int)); |
| static void finish_cdtor PARAMS ((tree)); |
| |
| static GTY(()) varray_type deferred_fns; |
| |
| int |
| c_missing_noreturn_ok_p (decl) |
| tree decl; |
| { |
| /* A missing noreturn is not ok for freestanding implementations and |
| ok for the `main' function in hosted implementations. */ |
| return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl)); |
| } |
| |
| /* We want to inline `extern inline' functions even if this would |
| violate inlining limits. Some glibc and linux constructs depend on |
| such functions always being inlined when optimizing. */ |
| |
| int |
| c_disregard_inline_limits (fn) |
| tree fn; |
| { |
| if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL) |
| return 1; |
| |
| return DECL_DECLARED_INLINE_P (fn) && DECL_EXTERNAL (fn); |
| } |
| |
| static tree |
| inline_forbidden_p (nodep, walk_subtrees, fn) |
| tree *nodep; |
| int *walk_subtrees ATTRIBUTE_UNUSED; |
| void *fn; |
| { |
| tree node = *nodep; |
| tree t; |
| |
| switch (TREE_CODE (node)) |
| { |
| case CALL_EXPR: |
| t = get_callee_fndecl (node); |
| |
| if (! t) |
| break; |
| |
| /* We cannot inline functions that call setjmp. */ |
| if (setjmp_call_p (t)) |
| return node; |
| |
| if (DECL_BUILT_IN (t)) |
| switch (DECL_FUNCTION_CODE (t)) |
| { |
| /* We cannot inline functions that take a variable number of |
| arguments. */ |
| case BUILT_IN_VA_START: |
| case BUILT_IN_STDARG_START: |
| case BUILT_IN_NEXT_ARG: |
| case BUILT_IN_VA_END: |
| return node; |
| |
| default: |
| break; |
| } |
| |
| break; |
| |
| case DECL_STMT: |
| /* We cannot inline functions that contain other functions. */ |
| if (TREE_CODE (TREE_OPERAND (node, 0)) == FUNCTION_DECL |
| && DECL_INITIAL (TREE_OPERAND (node, 0))) |
| return node; |
| break; |
| |
| case GOTO_STMT: |
| case GOTO_EXPR: |
| t = TREE_OPERAND (node, 0); |
| |
| /* We will not inline a function which uses computed goto. The |
| addresses of its local labels, which may be tucked into |
| global storage, are of course not constant across |
| instantiations, which causes unexpected behavior. */ |
| if (TREE_CODE (t) != LABEL_DECL) |
| return node; |
| |
| /* We cannot inline a nested function that jumps to a nonlocal |
| label. */ |
| if (TREE_CODE (t) == LABEL_DECL |
| && DECL_CONTEXT (t) && DECL_CONTEXT (t) != fn) |
| return node; |
| |
| break; |
| |
| case RECORD_TYPE: |
| case UNION_TYPE: |
| /* We cannot inline a function of the form |
| |
| void F (int i) { struct S { int ar[i]; } s; } |
| |
| Attempting to do so produces a catch-22 in tree-inline.c. |
| If walk_tree examines the TYPE_FIELDS chain of RECORD_TYPE/ |
| UNION_TYPE nodes, then it goes into infinite recursion on a |
| structure containing a pointer to its own type. If it doesn't, |
| then the type node for S doesn't get adjusted properly when |
| F is inlined, and we abort in find_function_data. */ |
| for (t = TYPE_FIELDS (node); t; t = TREE_CHAIN (t)) |
| if (variably_modified_type_p (TREE_TYPE (t))) |
| return node; |
| |
| default: |
| break; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| int |
| c_cannot_inline_tree_fn (fnp) |
| tree *fnp; |
| { |
| tree fn = *fnp; |
| tree t; |
| |
| if (flag_really_no_inline |
| && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL) |
| return 1; |
| |
| /* Don't auto-inline anything that might not be bound within |
| this unit of translation. */ |
| if (!DECL_DECLARED_INLINE_P (fn) && !(*targetm.binds_local_p) (fn)) |
| goto cannot_inline; |
| |
| if (! function_attribute_inlinable_p (fn)) |
| goto cannot_inline; |
| |
| /* If a function has pending sizes, we must not defer its |
| compilation, and we can't inline it as a tree. */ |
| if (fn == current_function_decl) |
| { |
| t = get_pending_sizes (); |
| put_pending_sizes (t); |
| |
| if (t) |
| goto cannot_inline; |
| } |
| |
| if (DECL_CONTEXT (fn)) |
| { |
| /* If a nested function has pending sizes, we may have already |
| saved them. */ |
| if (DECL_LANG_SPECIFIC (fn)->pending_sizes) |
| goto cannot_inline; |
| } |
| else |
| { |
| /* We rely on the fact that this function is called upfront, |
| just before we start expanding a function. If FN is active |
| (i.e., it's the current_function_decl or a parent thereof), |
| we have to walk FN's saved tree. Otherwise, we can safely |
| assume we have done it before and, if we didn't mark it as |
| uninlinable (in which case we wouldn't have been called), it |
| is inlinable. Unfortunately, this strategy doesn't work for |
| nested functions, because they're only expanded as part of |
| their enclosing functions, so the inlinability test comes in |
| late. */ |
| t = current_function_decl; |
| |
| while (t && t != fn) |
| t = DECL_CONTEXT (t); |
| if (! t) |
| return 0; |
| } |
| |
| if (walk_tree_without_duplicates |
| (&DECL_SAVED_TREE (fn), inline_forbidden_p, fn)) |
| goto cannot_inline; |
| |
| return 0; |
| |
| cannot_inline: |
| DECL_UNINLINABLE (fn) = 1; |
| return 1; |
| } |
| |
| /* Called from check_global_declarations. */ |
| |
| bool |
| c_warn_unused_global_decl (decl) |
| tree decl; |
| { |
| if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)) |
| return false; |
| if (DECL_IN_SYSTEM_HEADER (decl)) |
| return false; |
| |
| return true; |
| } |
| |
| /* Initialization common to C and Objective-C front ends. */ |
| const char * |
| c_objc_common_init (filename) |
| const char *filename; |
| { |
| c_init_decl_processing (); |
| |
| filename = c_common_init (filename); |
| if (filename == NULL) |
| return NULL; |
| |
| lang_expand_decl_stmt = c_expand_decl_stmt; |
| |
| /* These were not defined in the Objective-C front end, but I'm |
| putting them here anyway. The diagnostic format decoder might |
| want an enhanced ObjC implementation. */ |
| diagnostic_format_decoder (global_dc) = &c_tree_printer; |
| lang_missing_noreturn_ok_p = &c_missing_noreturn_ok_p; |
| |
| /* If still unspecified, make it match -std=c99 |
| (allowing for -pedantic-errors). */ |
| if (mesg_implicit_function_declaration < 0) |
| { |
| if (flag_isoc99) |
| mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1; |
| else |
| mesg_implicit_function_declaration = 0; |
| } |
| |
| VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns"); |
| |
| return filename; |
| } |
| |
| /* Register a function tree, so that its optimization and conversion |
| to RTL is only done at the end of the compilation. */ |
| |
| int |
| defer_fn (fn) |
| tree fn; |
| { |
| VARRAY_PUSH_TREE (deferred_fns, fn); |
| |
| return 1; |
| } |
| |
| /* Expand deferred functions for C and ObjC. */ |
| |
| static void |
| expand_deferred_fns () |
| { |
| unsigned int i; |
| |
| for (i = 0; i < VARRAY_ACTIVE_SIZE (deferred_fns); i++) |
| { |
| tree decl = VARRAY_TREE (deferred_fns, i); |
| |
| if (! TREE_ASM_WRITTEN (decl)) |
| { |
| /* For static inline functions, delay the decision whether to |
| emit them or not until wrapup_global_declarations. */ |
| if (! TREE_PUBLIC (decl)) |
| DECL_DEFER_OUTPUT (decl) = 1; |
| c_expand_deferred_function (decl); |
| } |
| } |
| |
| deferred_fns = 0; |
| } |
| |
| static tree |
| start_cdtor (method_type) |
| int method_type; |
| { |
| tree fnname = get_file_function_name (method_type); |
| tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node); |
| tree body; |
| |
| start_function (void_list_node_1, |
| build_nt (CALL_EXPR, fnname, |
| tree_cons (NULL_TREE, NULL_TREE, void_list_node_1), |
| NULL_TREE), |
| NULL_TREE); |
| store_parm_decls (); |
| |
| current_function_cannot_inline |
| = "static constructors and destructors cannot be inlined"; |
| |
| body = c_begin_compound_stmt (); |
| |
| pushlevel (0); |
| clear_last_expr (); |
| add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0); |
| |
| return body; |
| } |
| |
| static void |
| finish_cdtor (body) |
| tree body; |
| { |
| tree scope; |
| tree block; |
| |
| scope = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0); |
| block = poplevel (0, 0, 0); |
| SCOPE_STMT_BLOCK (TREE_PURPOSE (scope)) = block; |
| SCOPE_STMT_BLOCK (TREE_VALUE (scope)) = block; |
| |
| RECHAIN_STMTS (body, COMPOUND_BODY (body)); |
| |
| finish_function (0, 0); |
| } |
| |
| /* Called at end of parsing, but before end-of-file processing. */ |
| |
| void |
| c_objc_common_finish_file () |
| { |
| expand_deferred_fns (); |
| |
| if (static_ctors) |
| { |
| tree body = start_cdtor ('I'); |
| |
| for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors)) |
| c_expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors), |
| NULL_TREE)); |
| |
| finish_cdtor (body); |
| } |
| |
| if (static_dtors) |
| { |
| tree body = start_cdtor ('D'); |
| |
| for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors)) |
| c_expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors), |
| NULL_TREE)); |
| |
| finish_cdtor (body); |
| } |
| |
| { |
| int flags; |
| FILE *stream = dump_begin (TDI_all, &flags); |
| |
| if (stream) |
| { |
| dump_node (getdecls (), flags & ~TDF_SLIM, stream); |
| dump_end (TDI_all, stream); |
| } |
| } |
| } |
| |
| /* Called during diagnostic message formatting process to print a |
| source-level entity onto BUFFER. The meaning of the format specifiers |
| is as follows: |
| %D: a general decl, |
| %F: a function declaration, |
| %T: a type. |
| |
| These format specifiers form a subset of the format specifiers set used |
| by the C++ front-end. |
| Please notice when called, the `%' part was already skipped by the |
| diagnostic machinery. */ |
| static bool |
| c_tree_printer (buffer, text) |
| output_buffer *buffer; |
| text_info *text; |
| { |
| tree t = va_arg (*text->args_ptr, tree); |
| |
| switch (*text->format_spec) |
| { |
| case 'D': |
| case 'F': |
| case 'T': |
| { |
| const char *n = DECL_NAME (t) |
| ? (*lang_hooks.decl_printable_name) (t, 2) |
| : "({anonymous})"; |
| output_add_string (buffer, n); |
| } |
| return true; |
| |
| default: |
| return false; |
| } |
| } |
| |
| #include "gt-c-objc-common.h" |