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freebsd/contrib/gcc/langhooks.c

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/* Default language-specific hooks.
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Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
Contributed by Alexandre Oliva <aoliva@redhat.com>
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This file is part of GCC.
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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.
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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
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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"
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#include "coretypes.h"
#include "tm.h"
#include "toplev.h"
#include "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"
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#include "ggc.h"
#include "diagnostic.h"
/* Do nothing; in many cases the default hook. */
void
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lhd_do_nothing (void)
{
}
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/* Do nothing (tree). */
void
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lhd_do_nothing_t (tree t ATTRIBUTE_UNUSED)
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{
}
/* Do nothing (int). */
void
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lhd_do_nothing_i (int i ATTRIBUTE_UNUSED)
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{
}
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/* Do nothing (int, int, int). Return NULL_TREE. */
tree
lhd_do_nothing_iii_return_null_tree (int i ATTRIBUTE_UNUSED,
int j ATTRIBUTE_UNUSED,
int k ATTRIBUTE_UNUSED)
{
return NULL_TREE;
}
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/* Do nothing (function). */
void
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lhd_do_nothing_f (struct function *f ATTRIBUTE_UNUSED)
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{
}
/* Do nothing (return the tree node passed). */
tree
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lhd_return_tree (tree t)
{
return t;
}
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/* Do nothing (return NULL_TREE). */
tree
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lhd_return_null_tree_v (void)
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{
return NULL_TREE;
}
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/* Do nothing (return NULL_TREE). */
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tree
lhd_return_null_tree (tree t ATTRIBUTE_UNUSED)
{
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return NULL_TREE;
}
/* The default post options hook. */
bool
lhd_post_options (const char **pfilename ATTRIBUTE_UNUSED)
{
return false;
}
/* Called from by print-tree.c. */
void
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lhd_print_tree_nothing (FILE *file ATTRIBUTE_UNUSED,
tree node ATTRIBUTE_UNUSED,
int indent ATTRIBUTE_UNUSED)
{
}
/* Called from safe_from_p. */
int
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lhd_safe_from_p (rtx x ATTRIBUTE_UNUSED, tree exp ATTRIBUTE_UNUSED)
{
return 1;
}
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/* Called from unsafe_for_reeval. */
int
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lhd_unsafe_for_reeval (tree t ATTRIBUTE_UNUSED)
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{
return -1;
}
/* Called from staticp. */
int
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lhd_staticp (tree exp ATTRIBUTE_UNUSED)
{
return 0;
}
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/* Called from check_global_declarations. */
bool
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lhd_warn_unused_global_decl (tree decl)
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{
/* This is what used to exist in check_global_declarations. Probably
not many of these actually apply to non-C languages. */
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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;
}
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/* Number for making the label on the next
static variable internal to a function. */
static GTY(()) int var_labelno;
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/* Set the DECL_ASSEMBLER_NAME for DECL. */
void
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lhd_set_decl_assembler_name (tree decl)
{
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/* 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))))
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{
/* 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.
Can't use just the variable's own name for a variable whose
scope is less than the whole compilation. Concatenate a
distinguishing number. */
if (!TREE_PUBLIC (decl) && DECL_CONTEXT (decl))
{
const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
char *label;
ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
var_labelno++;
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (label));
}
else
SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
}
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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
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lhd_can_use_bit_fields_p (void)
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{
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
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lhd_clear_binding_stack (void)
{
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while (! (*lang_hooks.decls.global_bindings_p) ())
poplevel (0, 0, 0);
}
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/* Type promotion for variable arguments. */
tree
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lhd_type_promotes_to (tree type ATTRIBUTE_UNUSED)
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{
abort ();
}
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/* Registration of machine- or os-specific builtin types. */
void
lhd_register_builtin_type (tree type ATTRIBUTE_UNUSED,
const char* name ATTRIBUTE_UNUSED)
{
}
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/* Invalid use of an incomplete type. */
void
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lhd_incomplete_type_error (tree value ATTRIBUTE_UNUSED, tree type)
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{
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
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lhd_get_alias_set (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
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hook_get_alias_set_0 (tree t ATTRIBUTE_UNUSED)
{
return 0;
}
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/* This is the default expand_expr function. */
rtx
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lhd_expand_expr (tree t ATTRIBUTE_UNUSED, rtx r ATTRIBUTE_UNUSED,
enum machine_mode mm ATTRIBUTE_UNUSED,
int em ATTRIBUTE_UNUSED,
rtx *a ATTRIBUTE_UNUSED)
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{
abort ();
}
/* This is the default decl_printable_name function. */
const char *
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lhd_decl_printable_name (tree decl, int verbosity ATTRIBUTE_UNUSED)
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{
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
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properly. Both SUBTREES and *SUBTREES is guaranteed to be nonzero
when the function is called. */
tree
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lhd_tree_inlining_walk_subtrees (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
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lhd_tree_inlining_cannot_inline_tree_fn (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
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lhd_tree_inlining_disregard_inline_limits (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
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lhd_tree_inlining_add_pending_fn_decls (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
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lhd_tree_inlining_tree_chain_matters_p (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
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lhd_tree_inlining_auto_var_in_fn_p (tree var, tree 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
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lhd_tree_inlining_copy_res_decl_for_inlining (tree res, tree fn, tree 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
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lhd_tree_inlining_anon_aggr_type_p (tree t ATTRIBUTE_UNUSED)
{
return 0;
}
/* lang_hooks.tree_inlining.start_inlining and end_inlining perform any
language-specific bookkeeping necessary for processing
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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
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lhd_tree_inlining_start_inlining (tree fn ATTRIBUTE_UNUSED)
{
return 1;
}
void
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lhd_tree_inlining_end_inlining (tree fn ATTRIBUTE_UNUSED)
{
}
/* lang_hooks.tree_inlining.convert_parm_for_inlining performs any
language-specific conversion before assigning VALUE to PARM. */
tree
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lhd_tree_inlining_convert_parm_for_inlining (tree parm ATTRIBUTE_UNUSED,
tree value,
tree fndecl ATTRIBUTE_UNUSED,
int argnum ATTRIBUTE_UNUSED)
{
return value;
}
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/* 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. */
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bool
lhd_tree_dump_dump_tree (void *di ATTRIBUTE_UNUSED, tree t ATTRIBUTE_UNUSED)
{
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return false;
}
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/* lang_hooks.tree_dump.type_qual: Determine type qualifiers in a
language-specific way. */
int
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lhd_tree_dump_type_quals (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
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lhd_expr_size (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));
}
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/* lang_hooks.decl_uninit: Find out if a variable is uninitialized based
on DECL_INITIAL. */
bool
lhd_decl_uninit (tree t ATTRIBUTE_UNUSED)
{
return false;
}
/* lang_hooks.tree_size: Determine the size of a tree with code C,
which is a language-specific tree code in category 'x'. The
default expects never to be called. */
size_t
lhd_tree_size (enum tree_code c ATTRIBUTE_UNUSED)
{
abort ();
return 0;
}
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/* Return true if decl, which is a function decl, may be called by a
sibcall. */
bool
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lhd_decl_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED)
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{
return true;
}
/* lang_hooks.decls.final_write_globals: perform final processing on
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global variables. */
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void
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write_global_declarations (void)
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{
/* 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);
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tree *vec = xmalloc (sizeof (tree) * len);
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int i;
tree decl;
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/* Process the decls in reverse order--earliest first.
Put them into VEC from back to front, then take out from front. */
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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);
}
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/* Called to perform language-specific initialization of CTX. */
void
lhd_initialize_diagnostics (struct diagnostic_context *ctx ATTRIBUTE_UNUSED)
{
}
/* The default function to print out name of current function that caused
an error. */
void
lhd_print_error_function (diagnostic_context *context, const char *file)
{
if (diagnostic_last_function_changed (context))
{
const char *old_prefix = context->printer->prefix;
char *new_prefix = file ? file_name_as_prefix (file) : NULL;
pp_set_prefix (context->printer, new_prefix);
if (current_function_decl == NULL)
pp_printf (context->printer, "At top level:");
else
{
if (TREE_CODE (TREE_TYPE (current_function_decl)) == METHOD_TYPE)
pp_printf
(context->printer, "In member function `%s':",
(*lang_hooks.decl_printable_name) (current_function_decl, 2));
else
pp_printf
(context->printer, "In function `%s':",
(*lang_hooks.decl_printable_name) (current_function_decl, 2));
}
diagnostic_set_last_function (context);
pp_flush (context->printer);
context->printer->prefix = old_prefix;
free ((char*) new_prefix);
}
}
tree
lhd_callgraph_analyze_expr (tree *tp ATTRIBUTE_UNUSED,
int *walk_subtrees ATTRIBUTE_UNUSED,
tree decl ATTRIBUTE_UNUSED)
{
return NULL;
}
#include "gt-langhooks.h"