| /* Default language-specific hooks. |
| Copyright 2001, 2002 Free Software Foundation, Inc. |
| Contributed by Alexandre Oliva <aoliva@redhat.com> |
| |
| This file is part of GNU CC. |
| |
| GNU CC 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. |
| |
| GNU CC 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 GNU CC; 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 "toplev.h" |
| #include "tree.h" |
| #include "c-tree.h" |
| #include "tree-inline.h" |
| #include "rtl.h" |
| #include "insn-config.h" |
| #include "integrate.h" |
| #include "flags.h" |
| #include "langhooks.h" |
| #include "langhooks-def.h" |
| |
| /* Do nothing; in many cases the default hook. */ |
| |
| void |
| lhd_do_nothing () |
| { |
| } |
| |
| /* Do nothing (tree). */ |
| |
| void |
| lhd_do_nothing_t (t) |
| tree t ATTRIBUTE_UNUSED; |
| { |
| } |
| |
| /* Do nothing (int). */ |
| |
| void |
| lhd_do_nothing_i (i) |
| int i ATTRIBUTE_UNUSED; |
| { |
| } |
| |
| /* Do nothing (function). */ |
| |
| void |
| lhd_do_nothing_f (f) |
| struct function *f ATTRIBUTE_UNUSED; |
| { |
| } |
| |
| /* Do nothing (return the tree node passed). */ |
| |
| tree |
| lhd_return_tree (t) |
| tree t; |
| { |
| return t; |
| } |
| |
| /* Do nothing (return NULL_TREE). */ |
| |
| tree |
| lhd_return_null_tree (t) |
| tree t ATTRIBUTE_UNUSED; |
| { |
| return NULL_TREE; |
| } |
| |
| /* Do nothing; the default hook to decode an option. */ |
| |
| int |
| lhd_decode_option (argc, argv) |
| int argc ATTRIBUTE_UNUSED; |
| char **argv ATTRIBUTE_UNUSED; |
| { |
| return 0; |
| } |
| |
| /* Called from by print-tree.c. */ |
| |
| void |
| lhd_print_tree_nothing (file, node, indent) |
| FILE *file ATTRIBUTE_UNUSED; |
| tree node ATTRIBUTE_UNUSED; |
| int indent ATTRIBUTE_UNUSED; |
| { |
| } |
| |
| /* Called from safe_from_p. */ |
| |
| int |
| lhd_safe_from_p (x, exp) |
| rtx x ATTRIBUTE_UNUSED; |
| tree exp ATTRIBUTE_UNUSED; |
| { |
| return 1; |
| } |
| |
| /* Called from unsafe_for_reeval. */ |
| |
| int |
| lhd_unsafe_for_reeval (t) |
| tree t ATTRIBUTE_UNUSED; |
| { |
| return -1; |
| } |
| |
| /* Called from staticp. */ |
| |
| int |
| lhd_staticp (exp) |
| tree exp ATTRIBUTE_UNUSED; |
| { |
| return 0; |
| } |
| |
| /* Called from check_global_declarations. */ |
| |
| bool |
| lhd_warn_unused_global_decl (decl) |
| tree decl; |
| { |
| /* This is what used to exist in check_global_declarations. Probably |
| not many of these actually apply to non-C languages. */ |
| |
| if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl)) |
| return false; |
| if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl)) |
| return false; |
| if (DECL_IN_SYSTEM_HEADER (decl)) |
| return false; |
| |
| return true; |
| } |
| |
| /* Set the DECL_ASSEMBLER_NAME for DECL. */ |
| void |
| lhd_set_decl_assembler_name (decl) |
| tree decl; |
| { |
| /* The language-independent code should never use the |
| DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and |
| VAR_DECLs for variables with static storage duration need a real |
| DECL_ASSEMBLER_NAME. */ |
| if (TREE_CODE (decl) == FUNCTION_DECL |
| || (TREE_CODE (decl) == VAR_DECL |
| && (TREE_STATIC (decl) |
| || DECL_EXTERNAL (decl) |
| || TREE_PUBLIC (decl)))) |
| /* By default, assume the name to use in assembly code is the |
| same as that used in the source language. (That's correct |
| for C, and GCC used to set DECL_ASSEMBLER_NAME to the same |
| value as DECL_NAME in build_decl, so this choice provides |
| backwards compatibility with existing front-ends. */ |
| SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl)); |
| else |
| /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of |
| these DECLs -- unless they're in language-dependent code, in |
| which case set_decl_assembler_name hook should handle things. */ |
| abort (); |
| } |
| |
| /* By default we always allow bit-field based optimizations. */ |
| bool |
| lhd_can_use_bit_fields_p () |
| { |
| return true; |
| } |
| |
| /* Provide a default routine to clear the binding stack. This is used |
| by languages that don't need to do anything special. */ |
| void |
| lhd_clear_binding_stack () |
| { |
| while (! (*lang_hooks.decls.global_bindings_p) ()) |
| poplevel (0, 0, 0); |
| } |
| |
| /* Type promotion for variable arguments. */ |
| tree |
| lhd_type_promotes_to (type) |
| tree type ATTRIBUTE_UNUSED; |
| { |
| abort (); |
| } |
| |
| /* Invalid use of an incomplete type. */ |
| void |
| lhd_incomplete_type_error (value, type) |
| tree value ATTRIBUTE_UNUSED, type; |
| { |
| if (TREE_CODE (type) == ERROR_MARK) |
| return; |
| |
| abort (); |
| } |
| |
| /* Provide a default routine for alias sets that always returns -1. This |
| is used by languages that don't need to do anything special. */ |
| |
| HOST_WIDE_INT |
| lhd_get_alias_set (t) |
| tree t ATTRIBUTE_UNUSED; |
| { |
| return -1; |
| } |
| |
| /* Provide a hook routine for alias sets that always returns 0. This is |
| used by languages that haven't deal with alias sets yet. */ |
| |
| HOST_WIDE_INT |
| hook_get_alias_set_0 (t) |
| tree t ATTRIBUTE_UNUSED; |
| { |
| return 0; |
| } |
| |
| /* This is the default expand_expr function. */ |
| |
| rtx |
| lhd_expand_expr (t, r, mm, em) |
| tree t ATTRIBUTE_UNUSED; |
| rtx r ATTRIBUTE_UNUSED; |
| enum machine_mode mm ATTRIBUTE_UNUSED; |
| int em ATTRIBUTE_UNUSED; |
| { |
| abort (); |
| } |
| |
| /* This is the default decl_printable_name function. */ |
| |
| const char * |
| lhd_decl_printable_name (decl, verbosity) |
| tree decl; |
| int verbosity ATTRIBUTE_UNUSED; |
| { |
| return IDENTIFIER_POINTER (DECL_NAME (decl)); |
| } |
| |
| /* lang_hooks.tree_inlining.walk_subtrees is called by walk_tree() |
| after handling common cases, but before walking code-specific |
| sub-trees. If this hook is overridden for a language, it should |
| handle language-specific tree codes, as well as language-specific |
| information associated to common tree codes. If a tree node is |
| completely handled within this function, it should set *SUBTREES to |
| 0, so that generic handling isn't attempted. For language-specific |
| tree codes, generic handling would abort(), so make sure it is set |
| properly. Both SUBTREES and *SUBTREES is guaranteed to be nonzero |
| when the function is called. */ |
| |
| tree |
| lhd_tree_inlining_walk_subtrees (tp,subtrees,func,data,htab) |
| tree *tp ATTRIBUTE_UNUSED; |
| int *subtrees ATTRIBUTE_UNUSED; |
| walk_tree_fn func ATTRIBUTE_UNUSED; |
| void *data ATTRIBUTE_UNUSED; |
| void *htab ATTRIBUTE_UNUSED; |
| { |
| return NULL_TREE; |
| } |
| |
| /* lang_hooks.tree_inlining.cannot_inline_tree_fn is called to |
| determine whether there are language-specific reasons for not |
| inlining a given function. */ |
| |
| int |
| lhd_tree_inlining_cannot_inline_tree_fn (fnp) |
| tree *fnp; |
| { |
| if (flag_really_no_inline |
| && lookup_attribute ("always_inline", DECL_ATTRIBUTES (*fnp)) == NULL) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* lang_hooks.tree_inlining.disregard_inline_limits is called to |
| determine whether a function should be considered for inlining even |
| if it would exceed inlining limits. */ |
| |
| int |
| lhd_tree_inlining_disregard_inline_limits (fn) |
| tree fn; |
| { |
| if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* lang_hooks.tree_inlining.add_pending_fn_decls is called before |
| starting to inline a function, to push any language-specific |
| functions that should not be inlined into the current function, |
| into VAFNP. PFN is the top of varray, and should be returned if no |
| functions are pushed into VAFNP. The top of the varray should be |
| returned. */ |
| |
| tree |
| lhd_tree_inlining_add_pending_fn_decls (vafnp, pfn) |
| void *vafnp ATTRIBUTE_UNUSED; |
| tree pfn; |
| { |
| return pfn; |
| } |
| |
| /* lang_hooks.tree_inlining.tree_chain_matters_p indicates whether the |
| TREE_CHAIN of a language-specific tree node is relevant, i.e., |
| whether it should be walked, copied and preserved across copies. */ |
| |
| int |
| lhd_tree_inlining_tree_chain_matters_p (t) |
| tree t ATTRIBUTE_UNUSED; |
| { |
| return 0; |
| } |
| |
| /* lang_hooks.tree_inlining.auto_var_in_fn_p is called to determine |
| whether VT is an automatic variable defined in function FT. */ |
| |
| int |
| lhd_tree_inlining_auto_var_in_fn_p (var, fn) |
| tree var, fn; |
| { |
| return (DECL_P (var) && DECL_CONTEXT (var) == fn |
| && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL) |
| && ! TREE_STATIC (var)) |
| || TREE_CODE (var) == LABEL_DECL |
| || TREE_CODE (var) == RESULT_DECL)); |
| } |
| |
| /* lang_hooks.tree_inlining.copy_res_decl_for_inlining should return a |
| declaration for the result RES of function FN to be inlined into |
| CALLER. NDP points to an integer that should be set in case a new |
| declaration wasn't created (presumably because RES was of aggregate |
| type, such that a TARGET_EXPR is used for the result). TEXPS is a |
| pointer to a varray with the stack of TARGET_EXPRs seen while |
| inlining functions into caller; the top of TEXPS is supposed to |
| match RES. */ |
| |
| tree |
| lhd_tree_inlining_copy_res_decl_for_inlining (res, fn, caller, |
| dm, ndp, texps) |
| tree res, fn, caller; |
| void *dm ATTRIBUTE_UNUSED; |
| int *ndp ATTRIBUTE_UNUSED; |
| void *texps ATTRIBUTE_UNUSED; |
| { |
| return copy_decl_for_inlining (res, fn, caller); |
| } |
| |
| /* lang_hooks.tree_inlining.anon_aggr_type_p determines whether T is a |
| type node representing an anonymous aggregate (union, struct, etc), |
| i.e., one whose members are in the same scope as the union itself. */ |
| |
| int |
| lhd_tree_inlining_anon_aggr_type_p (t) |
| tree t ATTRIBUTE_UNUSED; |
| { |
| return 0; |
| } |
| |
| /* lang_hooks.tree_inlining.start_inlining and end_inlining perform any |
| language-specific bookkeeping necessary for processing |
| FN. start_inlining returns nonzero if inlining should proceed, zero if |
| not. |
| |
| For instance, the C++ version keeps track of template instantiations to |
| avoid infinite recursion. */ |
| |
| int |
| lhd_tree_inlining_start_inlining (fn) |
| tree fn ATTRIBUTE_UNUSED; |
| { |
| return 1; |
| } |
| |
| void |
| lhd_tree_inlining_end_inlining (fn) |
| tree fn ATTRIBUTE_UNUSED; |
| { |
| } |
| |
| /* lang_hooks.tree_inlining.convert_parm_for_inlining performs any |
| language-specific conversion before assigning VALUE to PARM. */ |
| |
| tree |
| lhd_tree_inlining_convert_parm_for_inlining (parm, value, fndecl) |
| tree parm ATTRIBUTE_UNUSED; |
| tree value; |
| tree fndecl ATTRIBUTE_UNUSED; |
| { |
| return value; |
| } |
| |
| /* lang_hooks.tree_dump.dump_tree: Dump language-specific parts of tree |
| nodes. Returns nonzero if it does not want the usual dumping of the |
| second argument. */ |
| |
| int |
| lhd_tree_dump_dump_tree (di, t) |
| void *di ATTRIBUTE_UNUSED; |
| tree t ATTRIBUTE_UNUSED; |
| { |
| return 0; |
| } |
| |
| /* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a |
| language-specific way. */ |
| |
| int |
| lhd_tree_dump_type_quals (t) |
| tree t; |
| { |
| return TYPE_QUALS (t); |
| } |
| |
| /* lang_hooks.expr_size: Determine the size of the value of an expression T |
| in a language-specific way. Returns a tree for the size in bytes. */ |
| |
| tree |
| lhd_expr_size (exp) |
| tree exp; |
| { |
| if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd' |
| && DECL_SIZE_UNIT (exp) != 0) |
| return DECL_SIZE_UNIT (exp); |
| else |
| return size_in_bytes (TREE_TYPE (exp)); |
| } |
| |
| /* Return true if decl, which is a function decl, may be called by a |
| sibcall. */ |
| |
| bool |
| lhd_decl_ok_for_sibcall (decl) |
| tree decl ATTRIBUTE_UNUSED; |
| { |
| return true; |
| } |
| |
| /* lang_hooks.decls.final_write_globals: perform final processing on |
| global variables. */ |
| void |
| write_global_declarations () |
| { |
| /* Really define vars that have had only a tentative definition. |
| Really output inline functions that must actually be callable |
| and have not been output so far. */ |
| |
| tree globals = (*lang_hooks.decls.getdecls) (); |
| int len = list_length (globals); |
| tree *vec = (tree *) xmalloc (sizeof (tree) * len); |
| int i; |
| tree decl; |
| |
| /* Process the decls in reverse order--earliest first. |
| Put them into VEC from back to front, then take out from front. */ |
| |
| for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) |
| vec[len - i - 1] = decl; |
| |
| wrapup_global_declarations (vec, len); |
| |
| check_global_declarations (vec, len); |
| |
| /* Clean up. */ |
| free (vec); |
| } |