mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-23 09:49:10 +08:00
2f51bb1d5a
* toplev.c, langhooks.c, langhooks-def.h: Move write_global_declarations from toplev.c to langhooks.c. From-SVN: r63094
480 lines
12 KiB
C
480 lines
12 KiB
C
/* 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 "coretypes.h"
|
|
#include "tm.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, return_slot_addr)
|
|
tree res, fn, caller;
|
|
void *dm ATTRIBUTE_UNUSED;
|
|
int *ndp ATTRIBUTE_UNUSED;
|
|
tree return_slot_addr ATTRIBUTE_UNUSED;
|
|
{
|
|
if (return_slot_addr)
|
|
return build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (return_slot_addr)),
|
|
return_slot_addr);
|
|
else
|
|
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));
|
|
}
|
|
|
|
/* 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);
|
|
}
|