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/* Process declarations and variables for C compiler.
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
2001, 2002 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. */
/* Process declarations and symbol lookup for C front end.
Also constructs types; the standard scalar types at initialization,
and structure, union, array and enum types when they are declared. */
/* ??? not all decl nodes are given the most useful possible
line numbers. For example, the CONST_DECLs for enum values. */
#include "config.h"
#include "system.h"
#include "intl.h"
#include "tree.h"
#include "tree-inline.h"
#include "rtl.h"
#include "flags.h"
#include "function.h"
#include "output.h"
#include "expr.h"
#include "c-tree.h"
#include "toplev.h"
#include "ggc.h"
#include "tm_p.h"
#include "cpplib.h"
#include "target.h"
#include "debug.h"
#include "timevar.h"
#include "c-common.h"
#include "c-pragma.h"
#include "libfuncs.h"
#include "except.h"
/* In grokdeclarator, distinguish syntactic contexts of declarators. */
enum decl_context
{ NORMAL, /* Ordinary declaration */
FUNCDEF, /* Function definition */
PARM, /* Declaration of parm before function body */
FIELD, /* Declaration inside struct or union */
BITFIELD, /* Likewise but with specified width */
TYPENAME}; /* Typename (inside cast or sizeof) */
/* Nonzero if we have seen an invalid cross reference
to a struct, union, or enum, but not yet printed the message. */
tree pending_invalid_xref;
/* File and line to appear in the eventual error message. */
const char *pending_invalid_xref_file;
int pending_invalid_xref_line;
/* While defining an enum type, this is 1 plus the last enumerator
constant value. Note that will do not have to save this or `enum_overflow'
around nested function definition since such a definition could only
occur in an enum value expression and we don't use these variables in
that case. */
static tree enum_next_value;
/* Nonzero means that there was overflow computing enum_next_value. */
static int enum_overflow;
/* Parsing a function declarator leaves a list of parameter names
or a chain or parameter decls here. */
static tree last_function_parms;
/* Parsing a function declarator leaves here a chain of structure
and enum types declared in the parmlist. */
static tree last_function_parm_tags;
/* After parsing the declarator that starts a function definition,
`start_function' puts here the list of parameter names or chain of decls.
`store_parm_decls' finds it here. */
static tree current_function_parms;
/* Similar, for last_function_parm_tags. */
static tree current_function_parm_tags;
/* Similar, for the file and line that the prototype came from if this is
an old-style definition. */
static const char *current_function_prototype_file;
static int current_function_prototype_line;
/* The current statement tree. */
static GTY(()) struct stmt_tree_s c_stmt_tree;
/* The current scope statement stack. */
static GTY(()) tree c_scope_stmt_stack;
/* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
that have names. Here so we can clear out their names' definitions
at the end of the function. */
static GTY(()) tree named_labels;
/* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
static GTY(()) tree shadowed_labels;
/* Set to 0 at beginning of a function definition, set to 1 if
a return statement that specifies a return value is seen. */
int current_function_returns_value;
/* Set to 0 at beginning of a function definition, set to 1 if
a return statement with no argument is seen. */
int current_function_returns_null;
/* Set to 0 at beginning of a function definition, set to 1 if
a call to a noreturn function is seen. */
int current_function_returns_abnormally;
/* Set to nonzero by `grokdeclarator' for a function
whose return type is defaulted, if warnings for this are desired. */
static int warn_about_return_type;
/* Nonzero when starting a function declared `extern inline'. */
static int current_extern_inline;
/* For each binding contour we allocate a binding_level structure
* which records the names defined in that contour.
* Contours include:
* 0) the global one
* 1) one for each function definition,
* where internal declarations of the parameters appear.
* 2) one for each compound statement,
* to record its declarations.
*
* The current meaning of a name can be found by searching the levels from
* the current one out to the global one.
*/
/* Note that the information in the `names' component of the global contour
is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
struct binding_level GTY(())
{
/* A chain of _DECL nodes for all variables, constants, functions,
and typedef types. These are in the reverse of the order supplied.
*/
tree names;
/* A list of structure, union and enum definitions,
* for looking up tag names.
* It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
* or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
* or ENUMERAL_TYPE node.
*/
tree tags;
/* For each level, a list of shadowed outer-level local definitions
to be restored when this level is popped.
Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
tree shadowed;
/* For each level (except not the global one),
a chain of BLOCK nodes for all the levels
that were entered and exited one level down. */
tree blocks;
/* The BLOCK node for this level, if one has been preallocated.
If 0, the BLOCK is allocated (if needed) when the level is popped. */
tree this_block;
/* The binding level which this one is contained in (inherits from). */
struct binding_level *level_chain;
/* Nonzero for the level that holds the parameters of a function. */
char parm_flag;
/* Nonzero if this level "doesn't exist" for tags. */
char tag_transparent;
/* Nonzero if sublevels of this level "don't exist" for tags.
This is set in the parm level of a function definition
while reading the function body, so that the outermost block
of the function body will be tag-transparent. */
char subblocks_tag_transparent;
/* Nonzero means make a BLOCK for this level regardless of all else. */
char keep;
/* Nonzero means make a BLOCK if this level has any subblocks. */
char keep_if_subblocks;
/* List of decls in `names' that have incomplete structure or
union types. */
tree incomplete_list;
/* A list of decls giving the (reversed) specified order of parms,
not including any forward-decls in the parmlist.
This is so we can put the parms in proper order for assign_parms. */
tree parm_order;
};
#define NULL_BINDING_LEVEL (struct binding_level *) NULL
/* The binding level currently in effect. */
static GTY(()) struct binding_level *current_binding_level;
/* A chain of binding_level structures awaiting reuse. */
static GTY((deletable (""))) struct binding_level *free_binding_level;
/* The outermost binding level, for names of file scope.
This is created when the compiler is started and exists
through the entire run. */
static GTY(()) struct binding_level *global_binding_level;
/* Binding level structures are initialized by copying this one. */
static struct binding_level clear_binding_level
= {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, NULL,
NULL};
/* Nonzero means unconditionally make a BLOCK for the next level pushed. */
static int keep_next_level_flag;
/* Nonzero means make a BLOCK for the next level pushed
if it has subblocks. */
static int keep_next_if_subblocks;
/* The chain of outer levels of label scopes.
This uses the same data structure used for binding levels,
but it works differently: each link in the chain records
saved values of named_labels and shadowed_labels for
a label binding level outside the current one. */
static GTY(()) struct binding_level *label_level_chain;
/* Functions called automatically at the beginning and end of execution. */
tree static_ctors, static_dtors;
/* Forward declarations. */
static struct binding_level * make_binding_level PARAMS ((void));
static void pop_binding_level PARAMS ((struct binding_level **));
static void clear_limbo_values PARAMS ((tree));
static int duplicate_decls PARAMS ((tree, tree, int));
static int redeclaration_error_message PARAMS ((tree, tree));
static void storedecls PARAMS ((tree));
static void storetags PARAMS ((tree));
static tree lookup_tag PARAMS ((enum tree_code, tree,
struct binding_level *, int));
static tree lookup_tag_reverse PARAMS ((tree));
static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
int));
static tree grokparms PARAMS ((tree, int));
static void layout_array_type PARAMS ((tree));
static tree c_make_fname_decl PARAMS ((tree, int));
static void c_expand_body PARAMS ((tree, int, int));
static void warn_if_shadowing PARAMS ((tree, tree));
static bool flexible_array_type_p PARAMS ((tree));
static int field_decl_cmp PARAMS ((const PTR, const PTR));
static tree set_save_expr_context PARAMS ((tree *, int *, void *));
/* States indicating how grokdeclarator() should handle declspecs marked
with __attribute__((deprecated)). An object declared as
__attribute__((deprecated)) suppresses warnings of uses of other
deprecated items. */
enum deprecated_states {
DEPRECATED_NORMAL,
DEPRECATED_SUPPRESS
};
static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
void
c_print_identifier (file, node, indent)
FILE *file;
tree node;
int indent;
{
print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
if (C_IS_RESERVED_WORD (node))
{
tree rid = ridpointers[C_RID_CODE (node)];
indent_to (file, indent + 4);
fprintf (file, "rid ");
fprintf (file, HOST_PTR_PRINTF, (void *)rid);
fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
}
}
/* Hook called at end of compilation to assume 1 elt
for a top-level tentative array defn that wasn't complete before. */
void
c_finish_incomplete_decl (decl)
tree decl;
{
if (TREE_CODE (decl) == VAR_DECL)
{
tree type = TREE_TYPE (decl);
if (type != error_mark_node
&& TREE_CODE (type) == ARRAY_TYPE
&& ! DECL_EXTERNAL (decl)
&& TYPE_DOMAIN (type) == 0)
{
warning_with_decl (decl, "array `%s' assumed to have one element");
complete_array_type (type, NULL_TREE, 1);
layout_decl (decl, 0);
}
}
}
/* Reuse or create a struct for this binding level. */
static struct binding_level *
make_binding_level ()
{
if (free_binding_level)
{
struct binding_level *result = free_binding_level;
free_binding_level = result->level_chain;
return result;
}
else
return (struct binding_level *) ggc_alloc (sizeof (struct binding_level));
}
/* Remove a binding level from a list and add it to the level chain. */
static void
pop_binding_level (lp)
struct binding_level **lp;
{
struct binding_level *l = *lp;
*lp = l->level_chain;
memset (l, 0, sizeof (struct binding_level));
l->level_chain = free_binding_level;
free_binding_level = l;
}
/* Nonzero if we are currently in the global binding level. */
int
global_bindings_p ()
{
return current_binding_level == global_binding_level;
}
void
keep_next_level ()
{
keep_next_level_flag = 1;
}
/* Nonzero if the current level needs to have a BLOCK made. */
int
kept_level_p ()
{
return ((current_binding_level->keep_if_subblocks
&& current_binding_level->blocks != 0)
|| current_binding_level->keep
|| current_binding_level->names != 0
|| (current_binding_level->tags != 0
&& !current_binding_level->tag_transparent));
}
/* Identify this binding level as a level of parameters.
DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
But it turns out there is no way to pass the right value for
DEFINITION_FLAG, so we ignore it. */
void
declare_parm_level (definition_flag)
int definition_flag ATTRIBUTE_UNUSED;
{
current_binding_level->parm_flag = 1;
}
/* Nonzero if currently making parm declarations. */
int
in_parm_level_p ()
{
return current_binding_level->parm_flag;
}
/* Enter a new binding level.
If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
not for that of tags. */
void
pushlevel (tag_transparent)
int tag_transparent;
{
struct binding_level *newlevel = NULL_BINDING_LEVEL;
/* If this is the top level of a function,
just make sure that NAMED_LABELS is 0. */
if (current_binding_level == global_binding_level)
{
named_labels = 0;
}
newlevel = make_binding_level ();
/* Add this level to the front of the chain (stack) of levels that
are active. */
*newlevel = clear_binding_level;
newlevel->tag_transparent
= (tag_transparent
|| (current_binding_level
? current_binding_level->subblocks_tag_transparent
: 0));
newlevel->level_chain = current_binding_level;
current_binding_level = newlevel;
newlevel->keep = keep_next_level_flag;
keep_next_level_flag = 0;
newlevel->keep_if_subblocks = keep_next_if_subblocks;
keep_next_if_subblocks = 0;
}
/* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
static void
clear_limbo_values (block)
tree block;
{
tree tem;
for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
if (DECL_NAME (tem) != 0)
IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
clear_limbo_values (tem);
}
/* Exit a binding level.
Pop the level off, and restore the state of the identifier-decl mappings
that were in effect when this level was entered.
If KEEP is nonzero, this level had explicit declarations, so
and create a "block" (a BLOCK node) for the level
to record its declarations and subblocks for symbol table output.
If FUNCTIONBODY is nonzero, this level is the body of a function,
so create a block as if KEEP were set and also clear out all
label names.
If REVERSE is nonzero, reverse the order of decls before putting
them into the BLOCK. */
tree
poplevel (keep, reverse, functionbody)
int keep;
int reverse;
int functionbody;
{
tree link;
/* The chain of decls was accumulated in reverse order.
Put it into forward order, just for cleanliness. */
tree decls;
tree tags = current_binding_level->tags;
tree subblocks = current_binding_level->blocks;
tree block = 0;
tree decl;
int block_previously_created;
keep |= current_binding_level->keep;
/* This warning is turned off because it causes warnings for
declarations like `extern struct foo *x'. */
#if 0
/* Warn about incomplete structure types in this level. */
for (link = tags; link; link = TREE_CHAIN (link))
if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
{
tree type = TREE_VALUE (link);
tree type_name = TYPE_NAME (type);
char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
? type_name
: DECL_NAME (type_name));
switch (TREE_CODE (type))
{
case RECORD_TYPE:
error ("`struct %s' incomplete in scope ending here", id);
break;
case UNION_TYPE:
error ("`union %s' incomplete in scope ending here", id);
break;
case ENUMERAL_TYPE:
error ("`enum %s' incomplete in scope ending here", id);
break;
}
}
#endif /* 0 */
/* Get the decls in the order they were written.
Usually current_binding_level->names is in reverse order.
But parameter decls were previously put in forward order. */
if (reverse)
current_binding_level->names
= decls = nreverse (current_binding_level->names);
else
decls = current_binding_level->names;
/* Output any nested inline functions within this block
if they weren't already output. */
for (decl = decls; decl; decl = TREE_CHAIN (decl))
if (TREE_CODE (decl) == FUNCTION_DECL
&& ! TREE_ASM_WRITTEN (decl)
&& DECL_INITIAL (decl) != 0
&& TREE_ADDRESSABLE (decl))
{
/* If this decl was copied from a file-scope decl
on account of a block-scope extern decl,
propagate TREE_ADDRESSABLE to the file-scope decl.
DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
true, since then the decl goes through save_for_inline_copying. */
if (DECL_ABSTRACT_ORIGIN (decl) != 0
&& DECL_ABSTRACT_ORIGIN (decl) != decl)
TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
}
/* We used to warn about unused variables in expand_end_bindings,
i.e. while generating RTL. But in function-at-a-time mode we may
choose to never expand a function at all (e.g. auto inlining), so
we do this explicitly now. */
warn_about_unused_variables (getdecls ());
/* If there were any declarations or structure tags in that level,
or if this level is a function body,
create a BLOCK to record them for the life of this function. */
block = 0;
block_previously_created = (current_binding_level->this_block != 0);
if (block_previously_created)
block = current_binding_level->this_block;
else if (keep || functionbody
|| (current_binding_level->keep_if_subblocks && subblocks != 0))
block = make_node (BLOCK);
if (block != 0)
{
BLOCK_VARS (block) = decls;
BLOCK_SUBBLOCKS (block) = subblocks;
}
/* In each subblock, record that this is its superior. */
for (link = subblocks; link; link = TREE_CHAIN (link))
BLOCK_SUPERCONTEXT (link) = block;
/* Clear out the meanings of the local variables of this level. */
for (link = decls; link; link = TREE_CHAIN (link))
{
if (DECL_NAME (link) != 0)
{
/* If the ident. was used or addressed via a local extern decl,
don't forget that fact. */
if (DECL_EXTERNAL (link))
{
if (TREE_USED (link))
TREE_USED (DECL_NAME (link)) = 1;
if (TREE_ADDRESSABLE (link))
TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
}
IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
}
}
/* Restore all name-meanings of the outer levels
that were shadowed by this level. */
for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
/* If the level being exited is the top level of a function,
check over all the labels, and clear out the current
(function local) meanings of their names. */
if (functionbody)
{
clear_limbo_values (block);
/* If this is the top level block of a function,
the vars are the function's parameters.
Don't leave them in the BLOCK because they are
found in the FUNCTION_DECL instead. */
BLOCK_VARS (block) = 0;
/* Clear out the definitions of all label names,
since their scopes end here,
and add them to BLOCK_VARS. */
for (link = named_labels; link; link = TREE_CHAIN (link))
{
tree label = TREE_VALUE (link);
if (DECL_INITIAL (label) == 0)
{
error_with_decl (label, "label `%s' used but not defined");
/* Avoid crashing later. */
define_label (input_filename, lineno,
DECL_NAME (label));
}
else if (warn_unused_label && !TREE_USED (label))
warning_with_decl (label, "label `%s' defined but not used");
IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
/* Put the labels into the "variables" of the
top-level block, so debugger can see them. */
TREE_CHAIN (label) = BLOCK_VARS (block);
BLOCK_VARS (block) = label;
}
}
/* Pop the current level, and free the structure for reuse. */
pop_binding_level (&current_binding_level);
/* Dispose of the block that we just made inside some higher level. */
if (functionbody)
DECL_INITIAL (current_function_decl) = block;
else if (block)
{
if (!block_previously_created)
current_binding_level->blocks
= chainon (current_binding_level->blocks, block);
}
/* If we did not make a block for the level just exited,
any blocks made for inner levels
(since they cannot be recorded as subblocks in that level)
must be carried forward so they will later become subblocks
of something else. */
else if (subblocks)
current_binding_level->blocks
= chainon (current_binding_level->blocks, subblocks);
/* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
binding contour so that they point to the appropriate construct, i.e.
either to the current FUNCTION_DECL node, or else to the BLOCK node
we just constructed.
Note that for tagged types whose scope is just the formal parameter
list for some function type specification, we can't properly set
their TYPE_CONTEXTs here, because we don't have a pointer to the
appropriate FUNCTION_TYPE node readily available to us. For those
cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
node which will represent the "scope" for these "parameter list local"
tagged types. */
if (functionbody)
for (link = tags; link; link = TREE_CHAIN (link))
TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
else if (block)
for (link = tags; link; link = TREE_CHAIN (link))
TYPE_CONTEXT (TREE_VALUE (link)) = block;
if (block)
TREE_USED (block) = 1;
return block;
}
/* Insert BLOCK at the end of the list of subblocks of the
current binding level. This is used when a BIND_EXPR is expanded,
to handle the BLOCK node inside the BIND_EXPR. */
void
insert_block (block)
tree block;
{
TREE_USED (block) = 1;
current_binding_level->blocks
= chainon (current_binding_level->blocks, block);
}
/* Set the BLOCK node for the innermost scope
(the one we are currently in). */
void
set_block (block)
tree block;
{
current_binding_level->this_block = block;
current_binding_level->names = chainon (current_binding_level->names,
BLOCK_VARS (block));
current_binding_level->blocks = chainon (current_binding_level->blocks,
BLOCK_SUBBLOCKS (block));
}
void
push_label_level ()
{
struct binding_level *newlevel;
newlevel = make_binding_level ();
/* Add this level to the front of the chain (stack) of label levels. */
newlevel->level_chain = label_level_chain;
label_level_chain = newlevel;
newlevel->names = named_labels;
newlevel->shadowed = shadowed_labels;
named_labels = 0;
shadowed_labels = 0;
}
void
pop_label_level ()
{
struct binding_level *level = label_level_chain;
tree link, prev;
/* Clear out the definitions of the declared labels in this level.
Leave in the list any ordinary, non-declared labels. */
for (link = named_labels, prev = 0; link;)
{
if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
{
if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
{
error_with_decl (TREE_VALUE (link),
"label `%s' used but not defined");
/* Avoid crashing later. */
define_label (input_filename, lineno,
DECL_NAME (TREE_VALUE (link)));
}
else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
warning_with_decl (TREE_VALUE (link),
"label `%s' defined but not used");
IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
/* Delete this element from the list. */
link = TREE_CHAIN (link);
if (prev)
TREE_CHAIN (prev) = link;
else
named_labels = link;
}
else
{
prev = link;
link = TREE_CHAIN (link);
}
}
/* Bring back all the labels that were shadowed. */
for (link = shadowed_labels; link; link = TREE_CHAIN (link))
if (DECL_NAME (TREE_VALUE (link)) != 0)
IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
= TREE_VALUE (link);
named_labels = chainon (named_labels, level->names);
shadowed_labels = level->shadowed;
/* Pop the current level, and free the structure for reuse. */
pop_binding_level (&label_level_chain);
}
/* Push a definition or a declaration of struct, union or enum tag "name".
"type" should be the type node.
We assume that the tag "name" is not already defined.
Note that the definition may really be just a forward reference.
In that case, the TYPE_SIZE will be zero. */
void
pushtag (name, type)
tree name, type;
{
struct binding_level *b;
/* Find the proper binding level for this type tag. */
for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
continue;
if (name)
{
/* Record the identifier as the type's name if it has none. */
if (TYPE_NAME (type) == 0)
TYPE_NAME (type) = name;
}
b->tags = tree_cons (name, type, b->tags);
/* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
tagged type we just added to the current binding level. This fake
NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
to output a representation of a tagged type, and it also gives
us a convenient place to record the "scope start" address for the
tagged type. */
TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
/* An approximation for now, so we can tell this is a function-scope tag.
This will be updated in poplevel. */
TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
}
/* Handle when a new declaration NEWDECL
has the same name as an old one OLDDECL
in the same binding contour.
Prints an error message if appropriate.
If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
Otherwise, return 0.
When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
and OLDDECL is in an outer binding level and should thus not be changed. */
static int
duplicate_decls (newdecl, olddecl, different_binding_level)
tree newdecl, olddecl;
int different_binding_level;
{
int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
&& DECL_INITIAL (newdecl) != 0);
tree oldtype = TREE_TYPE (olddecl);
tree newtype = TREE_TYPE (newdecl);
int errmsg = 0;
if (DECL_P (olddecl))
{
if (TREE_CODE (newdecl) == FUNCTION_DECL
&& TREE_CODE (olddecl) == FUNCTION_DECL
&& (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
{
if (DECL_DECLARED_INLINE_P (newdecl)
&& DECL_UNINLINABLE (newdecl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
/* Already warned elsewhere. */;
else if (DECL_DECLARED_INLINE_P (olddecl)
&& DECL_UNINLINABLE (olddecl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
/* Already warned. */;
else if (DECL_DECLARED_INLINE_P (newdecl)
&& ! DECL_DECLARED_INLINE_P (olddecl)
&& DECL_UNINLINABLE (olddecl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
{
warning_with_decl (newdecl,
"function `%s' redeclared as inline");
warning_with_decl (olddecl,
"previous declaration of function `%s' with attribute noinline");
}
else if (DECL_DECLARED_INLINE_P (olddecl)
&& DECL_UNINLINABLE (newdecl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
{
warning_with_decl (newdecl,
"function `%s' redeclared with attribute noinline");
warning_with_decl (olddecl,
"previous declaration of function `%s' was inline");
}
}
DECL_ATTRIBUTES (newdecl)
= (*targetm.merge_decl_attributes) (olddecl, newdecl);
}
if (TREE_CODE (newtype) == ERROR_MARK
|| TREE_CODE (oldtype) == ERROR_MARK)
types_match = 0;
/* New decl is completely inconsistent with the old one =>
tell caller to replace the old one.
This is always an error except in the case of shadowing a builtin. */
if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
{
if (TREE_CODE (olddecl) == FUNCTION_DECL
&& (DECL_BUILT_IN (olddecl)
|| DECL_BUILT_IN_NONANSI (olddecl)))
{
/* If you declare a built-in or predefined function name as static,
the old definition is overridden,
but optionally warn this was a bad choice of name. */
if (!TREE_PUBLIC (newdecl))
{
if (!warn_shadow)
;
else if (DECL_BUILT_IN (olddecl))
warning_with_decl (newdecl, "shadowing built-in function `%s'");
else
warning_with_decl (newdecl, "shadowing library function `%s'");
}
/* Likewise, if the built-in is not ansi, then programs can
override it even globally without an error. */
else if (! DECL_BUILT_IN (olddecl))
warning_with_decl (newdecl,
"library function `%s' declared as non-function");
else if (DECL_BUILT_IN_NONANSI (olddecl))
warning_with_decl (newdecl,
"built-in function `%s' declared as non-function");
else
warning_with_decl (newdecl,
"built-in function `%s' declared as non-function");
}
else
{
error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
error_with_decl (olddecl, "previous declaration of `%s'");
}
return 0;
}
/* For real parm decl following a forward decl,
return 1 so old decl will be reused. */
if (types_match && TREE_CODE (newdecl) == PARM_DECL
&& TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
return 1;
/* The new declaration is the same kind of object as the old one.
The declarations may partially match. Print warnings if they don't
match enough. Ultimately, copy most of the information from the new
decl to the old one, and keep using the old one. */
if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
{
/* A function declaration for a built-in function. */
if (!TREE_PUBLIC (newdecl))
{
/* If you declare a built-in function name as static, the
built-in definition is overridden,
but optionally warn this was a bad choice of name. */
if (warn_shadow)
warning_with_decl (newdecl, "shadowing built-in function `%s'");
/* Discard the old built-in function. */
return 0;
}
else if (!types_match)
{
/* Accept the return type of the new declaration if same modes. */
tree oldreturntype = TREE_TYPE (oldtype);
tree newreturntype = TREE_TYPE (newtype);
if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
{
/* Function types may be shared, so we can't just modify
the return type of olddecl's function type. */
tree trytype
= build_function_type (newreturntype,
TYPE_ARG_TYPES (oldtype));
trytype = build_type_attribute_variant (trytype,
TYPE_ATTRIBUTES (oldtype));
types_match = comptypes (newtype, trytype);
if (types_match)
oldtype = trytype;
}
/* Accept harmless mismatch in first argument type also.
This is for the ffs and fprintf builtins. */
if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
&& TYPE_ARG_TYPES (oldtype) != 0
&& TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
&& TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
&& (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
== TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
{
/* Function types may be shared, so we can't just modify
the return type of olddecl's function type. */
tree trytype
= build_function_type (TREE_TYPE (oldtype),
tree_cons (NULL_TREE,
TREE_VALUE (TYPE_ARG_TYPES (newtype)),
TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
trytype = build_type_attribute_variant (trytype,
TYPE_ATTRIBUTES (oldtype));
types_match = comptypes (newtype, trytype);
if (types_match)
oldtype = trytype;
}
if (! different_binding_level)
TREE_TYPE (olddecl) = oldtype;
}
else if (TYPE_ARG_TYPES (oldtype) == NULL
&& TYPE_ARG_TYPES (newtype) != NULL)
{
/* For bcmp, bzero, fputs the builtin type has arguments not
specified. Use the ones from the prototype so that type checking
is done for them. */
tree trytype
= build_function_type (TREE_TYPE (oldtype),
TYPE_ARG_TYPES (newtype));
trytype = build_type_attribute_variant (trytype,
TYPE_ATTRIBUTES (oldtype));
oldtype = trytype;
if (! different_binding_level)
TREE_TYPE (olddecl) = oldtype;
}
if (!types_match)
{
/* If types don't match for a built-in, throw away the built-in. */
warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
return 0;
}
}
else if (TREE_CODE (olddecl) == FUNCTION_DECL
&& DECL_SOURCE_LINE (olddecl) == 0)
{
/* A function declaration for a predeclared function
that isn't actually built in. */
if (!TREE_PUBLIC (newdecl))
{
/* If you declare it as static, the
default definition is overridden. */
return 0;
}
else if (!types_match)
{
/* If the types don't match, preserve volatility indication.
Later on, we will discard everything else about the
default declaration. */
TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
}
}
/* Permit char *foo () to match void *foo (...) if not pedantic,
if one of them came from a system header file. */
else if (!types_match
&& TREE_CODE (olddecl) == FUNCTION_DECL
&& TREE_CODE (newdecl) == FUNCTION_DECL
&& TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
&& (DECL_IN_SYSTEM_HEADER (olddecl)
|| DECL_IN_SYSTEM_HEADER (newdecl))
&& ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
&& TYPE_ARG_TYPES (oldtype) == 0
&& self_promoting_args_p (TYPE_ARG_TYPES (newtype))
&& TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
||
(TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
&& TYPE_ARG_TYPES (newtype) == 0
&& self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
&& TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
{
if (pedantic)
pedwarn_with_decl (newdecl, "conflicting types for `%s'");
/* Make sure we keep void * as ret type, not char *. */
if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
TREE_TYPE (newdecl) = newtype = oldtype;
/* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
we will come back here again. */
DECL_IN_SYSTEM_HEADER (newdecl) = 1;
}
else if (!types_match
/* Permit char *foo (int, ...); followed by char *foo ();
if not pedantic. */
&& ! (TREE_CODE (olddecl) == FUNCTION_DECL
&& ! pedantic
/* Return types must still match. */
&& comptypes (TREE_TYPE (oldtype),
TREE_TYPE (newtype))
&& TYPE_ARG_TYPES (newtype) == 0))
{
error_with_decl (newdecl, "conflicting types for `%s'");
/* Check for function type mismatch
involving an empty arglist vs a nonempty one. */
if (TREE_CODE (olddecl) == FUNCTION_DECL
&& comptypes (TREE_TYPE (oldtype),
TREE_TYPE (newtype))
&& ((TYPE_ARG_TYPES (oldtype) == 0
&& DECL_INITIAL (olddecl) == 0)
||
(TYPE_ARG_TYPES (newtype) == 0
&& DECL_INITIAL (newdecl) == 0)))
{
/* Classify the problem further. */
tree t = TYPE_ARG_TYPES (oldtype);
if (t == 0)
t = TYPE_ARG_TYPES (newtype);
for (; t; t = TREE_CHAIN (t))
{
tree type = TREE_VALUE (t);
if (TREE_CHAIN (t) == 0
&& TYPE_MAIN_VARIANT (type) != void_type_node)
{
error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
break;
}
if (c_type_promotes_to (type) != type)
{
error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
break;
}
}
}
error_with_decl (olddecl, "previous declaration of `%s'");
/* This is safer because the initializer might contain references
to variables that were declared between olddecl and newdecl. This
will make the initializer invalid for olddecl in case it gets
assigned to olddecl below. */
if (TREE_CODE (newdecl) == VAR_DECL)
DECL_INITIAL (newdecl) = 0;
}
/* TLS cannot follow non-TLS declaration. */
else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
&& !DECL_THREAD_LOCAL (olddecl) && DECL_THREAD_LOCAL (newdecl))
{
error_with_decl (newdecl, "thread-local declaration of `%s' follows non thread-local declaration");
error_with_decl (olddecl, "previous declaration of `%s'");
}
/* non-TLS declaration cannot follow TLS declaration. */
else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL
&& DECL_THREAD_LOCAL (olddecl) && !DECL_THREAD_LOCAL (newdecl))
{
error_with_decl (newdecl, "non thread-local declaration of `%s' follows thread-local declaration");
error_with_decl (olddecl, "previous declaration of `%s'");
}
else
{
errmsg = redeclaration_error_message (newdecl, olddecl);
if (errmsg)
{
switch (errmsg)
{
case 1:
error_with_decl (newdecl, "redefinition of `%s'");
break;
case 2:
error_with_decl (newdecl, "redeclaration of `%s'");
break;
case 3:
error_with_decl (newdecl, "conflicting declarations of `%s'");
break;
default:
abort ();
}
error_with_decl (olddecl,
((DECL_INITIAL (olddecl)
&& current_binding_level == global_binding_level)
? "`%s' previously defined here"
: "`%s' previously declared here"));
return 0;
}
else if (TREE_CODE (newdecl) == TYPE_DECL
&& (DECL_IN_SYSTEM_HEADER (olddecl)
|| DECL_IN_SYSTEM_HEADER (newdecl)))
{
warning_with_decl (newdecl, "redefinition of `%s'");
warning_with_decl
(olddecl,
((DECL_INITIAL (olddecl)
&& current_binding_level == global_binding_level)
? "`%s' previously defined here"
: "`%s' previously declared here"));
}
else if (TREE_CODE (olddecl) == FUNCTION_DECL
&& DECL_INITIAL (olddecl) != 0
&& TYPE_ARG_TYPES (oldtype) == 0
&& TYPE_ARG_TYPES (newtype) != 0
&& TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
{
tree type, parm;
int nargs;
/* Prototype decl follows defn w/o prototype. */
for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
type = TYPE_ARG_TYPES (newtype),
nargs = 1;
;
parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
{
if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
&& TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
{
warning_with_decl (newdecl, "prototype for `%s' follows");
warning_with_decl (olddecl, "non-prototype definition here");
break;
}
if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
|| TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
{
error_with_decl (newdecl,
"prototype for `%s' follows and number of arguments doesn't match");
error_with_decl (olddecl, "non-prototype definition here");
errmsg = 1;
break;
}
/* Type for passing arg must be consistent
with that declared for the arg. */
if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
{
error_with_decl (newdecl,
"prototype for `%s' follows and argument %d doesn't match",
nargs);
error_with_decl (olddecl, "non-prototype definition here");
errmsg = 1;
break;
}
}
}
/* Warn about mismatches in various flags. */
else
{
/* Warn if function is now inline
but was previously declared not inline and has been called. */
if (TREE_CODE (olddecl) == FUNCTION_DECL
&& ! DECL_DECLARED_INLINE_P (olddecl)
&& DECL_DECLARED_INLINE_P (newdecl)
&& TREE_USED (olddecl))
warning_with_decl (newdecl,
"`%s' declared inline after being called");
if (TREE_CODE (olddecl) == FUNCTION_DECL
&& ! DECL_DECLARED_INLINE_P (olddecl)
&& DECL_DECLARED_INLINE_P (newdecl)
&& DECL_INITIAL (olddecl) != 0)
warning_with_decl (newdecl,
"`%s' declared inline after its definition");
/* If pedantic, warn when static declaration follows a non-static
declaration. Otherwise, do so only for functions. */
if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
&& TREE_PUBLIC (olddecl)
&& !TREE_PUBLIC (newdecl))
warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
/* If warn_traditional, warn when a non-static function
declaration follows a static one. */
if (warn_traditional && !in_system_header
&& TREE_CODE (olddecl) == FUNCTION_DECL
&& !TREE_PUBLIC (olddecl)
&& TREE_PUBLIC (newdecl))
warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
/* Warn when const declaration follows a non-const
declaration, but not for functions. */
if (TREE_CODE (olddecl) != FUNCTION_DECL
&& !TREE_READONLY (olddecl)
&& TREE_READONLY (newdecl))
warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
/* These bits are logically part of the type, for variables.
But not for functions
(where qualifiers are not valid ANSI anyway). */
else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
&& (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
|| TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
}
}
/* Optionally warn about more than one declaration for the same name. */
if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
/* Don't warn about a function declaration
followed by a definition. */
&& !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
&& DECL_INITIAL (olddecl) == 0)
/* Don't warn about extern decl followed by (tentative) definition. */
&& !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
{
warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
warning_with_decl (olddecl, "previous declaration of `%s'");
}
/* Copy all the DECL_... slots specified in the new decl
except for any that we copy here from the old type.
Past this point, we don't change OLDTYPE and NEWTYPE
even if we change the types of NEWDECL and OLDDECL. */
if (types_match)
{
/* When copying info to olddecl, we store into write_olddecl
instead. This allows us to avoid modifying olddecl when
different_binding_level is true. */
tree write_olddecl = different_binding_level ? newdecl : olddecl;
/* Merge the data types specified in the two decls. */
if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
{
if (different_binding_level)
{
if (TYPE_ARG_TYPES (oldtype) != 0
&& TYPE_ARG_TYPES (newtype) == 0)
TREE_TYPE (newdecl) = common_type (newtype, oldtype);
else
TREE_TYPE (newdecl)
= build_type_attribute_variant
(newtype,
merge_attributes (TYPE_ATTRIBUTES (newtype),
TYPE_ATTRIBUTES (oldtype)));
}
else
TREE_TYPE (newdecl)
= TREE_TYPE (olddecl)
= common_type (newtype, oldtype);
}
/* Lay the type out, unless already done. */
if (oldtype != TREE_TYPE (newdecl))
{
if (TREE_TYPE (newdecl) != error_mark_node)
layout_type (TREE_TYPE (newdecl));
if (TREE_CODE (newdecl) != FUNCTION_DECL
&& TREE_CODE (newdecl) != TYPE_DECL
&& TREE_CODE (newdecl) != CONST_DECL)
layout_decl (newdecl, 0);
}
else
{
/* Since the type is OLDDECL's, make OLDDECL's size go with. */
DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
DECL_MODE (newdecl) = DECL_MODE (olddecl);
if (TREE_CODE (olddecl) != FUNCTION_DECL)
if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
{
DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
}
}
/* Keep the old rtl since we can safely use it. */
COPY_DECL_RTL (olddecl, newdecl);
/* Merge the type qualifiers. */
if (TREE_READONLY (newdecl))
TREE_READONLY (write_olddecl) = 1;
if (TREE_THIS_VOLATILE (newdecl))
{
TREE_THIS_VOLATILE (write_olddecl) = 1;
if (TREE_CODE (newdecl) == VAR_DECL
/* If an automatic variable is re-declared in the same
function scope, but the old declaration was not
volatile, make_var_volatile() would crash because the
variable would have been assigned to a pseudo, not a
MEM. Since this duplicate declaration is invalid
anyway, we just skip the call. */
&& errmsg == 0)
make_var_volatile (newdecl);
}
/* Keep source location of definition rather than declaration. */
/* When called with different_binding_level set, keep the old
information so that meaningful diagnostics can be given. */
if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
&& ! different_binding_level)
{
DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
}
/* Merge the unused-warning information. */
if (DECL_IN_SYSTEM_HEADER (olddecl))
DECL_IN_SYSTEM_HEADER (newdecl) = 1;
else if (DECL_IN_SYSTEM_HEADER (newdecl))
DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
/* Merge the initialization information. */
/* When called with different_binding_level set, don't copy over
DECL_INITIAL, so that we don't accidentally change function
declarations into function definitions. */
if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
/* Merge the section attribute.
We want to issue an error if the sections conflict but that must be
done later in decl_attributes since we are called before attributes
are assigned. */
if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
/* Copy the assembler name.
Currently, it can only be defined in the prototype. */
COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
|= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
}
}
/* If cannot merge, then use the new type and qualifiers,
and don't preserve the old rtl. */
else if (! different_binding_level)
{
TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
}
/* Merge the storage class information. */
merge_weak (newdecl, olddecl);
/* For functions, static overrides non-static. */
if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
/* This is since we don't automatically
copy the attributes of NEWDECL into OLDDECL. */
/* No need to worry about different_binding_level here because
then TREE_PUBLIC (newdecl) was true. */
TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
/* If this clears `static', clear it in the identifier too. */
if (! TREE_PUBLIC (olddecl))
TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
}
if (DECL_EXTERNAL (newdecl))
{
if (! different_binding_level)
{
/* Don't mess with these flags on local externs; they remain
external even if there's a declaration at file scope which
isn't. */
TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
}
/* An extern decl does not override previous storage class. */
TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
if (! DECL_EXTERNAL (newdecl))
DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
}
else
{
TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
}
if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
/* If we're redefining a function previously defined as extern
inline, make sure we emit debug info for the inline before we
throw it away, in case it was inlined into a function that hasn't
been written out yet. */
if (new_is_definition && DECL_INITIAL (olddecl))
{
if (TREE_USED (olddecl))
(*debug_hooks->outlining_inline_function) (olddecl);
/* The new defn must not be inline. */
DECL_INLINE (newdecl) = 0;
DECL_UNINLINABLE (newdecl) = 1;
}
else
{
/* If either decl says `inline', this fn is inline,
unless its definition was passed already. */
if (DECL_DECLARED_INLINE_P (newdecl)
|| DECL_DECLARED_INLINE_P (olddecl))
DECL_DECLARED_INLINE_P (newdecl) = 1;
DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
= (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
}
if (DECL_BUILT_IN (olddecl))
{
/* Get rid of any built-in function if new arg types don't match it
or if we have a function definition. */
if (! types_match || new_is_definition)
{
if (! different_binding_level)
{
TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
}
}
else
{
/* If redeclaring a builtin function, and not a definition,
it stays built in. */
DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
}
}
/* Also preserve various other info from the definition. */
if (! new_is_definition)
{
DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
/* When called with different_binding_level set, don't copy over
DECL_INITIAL, so that we don't accidentally change function
declarations into function definitions. */
if (! different_binding_level)
DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
/* Set DECL_INLINE on the declaration if we've got a body
from which to instantiate. */
if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
{
DECL_INLINE (newdecl) = 1;
DECL_ABSTRACT_ORIGIN (newdecl)
= (different_binding_level
? DECL_ORIGIN (olddecl)
: DECL_ABSTRACT_ORIGIN (olddecl));
}
}
else
{
/* If a previous declaration said inline, mark the
definition as inlinable. */
if (DECL_DECLARED_INLINE_P (newdecl)
&& ! DECL_UNINLINABLE (newdecl))
DECL_INLINE (newdecl) = 1;
}
}
if (different_binding_level)
return 0;
/* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
But preserve OLDDECL's DECL_UID. */
{
unsigned olddecl_uid = DECL_UID (olddecl);
memcpy ((char *) olddecl + sizeof (struct tree_common),
(char *) newdecl + sizeof (struct tree_common),
sizeof (struct tree_decl) - sizeof (struct tree_common));
DECL_UID (olddecl) = olddecl_uid;
}
/* NEWDECL contains the merged attribute lists.
Update OLDDECL to be the same. */
DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
/* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
so that encode_section_info has a chance to look at the new decl
flags and attributes. */
if (DECL_RTL_SET_P (olddecl)
&& (TREE_CODE (olddecl) == FUNCTION_DECL
|| (TREE_CODE (olddecl) == VAR_DECL
&& TREE_STATIC (olddecl))))
make_decl_rtl (olddecl, NULL);
return 1;
}
/* Check whether decl-node X shadows an existing declaration.
OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
which might be a NULL_TREE. */
static void
warn_if_shadowing (x, oldlocal)
tree x, oldlocal;
{
tree name;
if (DECL_EXTERNAL (x))
return;
name = DECL_NAME (x);
/* Warn if shadowing an argument at the top level of the body. */
if (oldlocal != 0
/* This warning doesn't apply to the parms of a nested fcn. */
&& ! current_binding_level->parm_flag
/* Check that this is one level down from the parms. */
&& current_binding_level->level_chain->parm_flag
/* Check that the decl being shadowed
comes from the parm level, one level up. */
&& chain_member (oldlocal, current_binding_level->level_chain->names))
{
if (TREE_CODE (oldlocal) == PARM_DECL)
pedwarn ("declaration of `%s' shadows a parameter",
IDENTIFIER_POINTER (name));
else
pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
IDENTIFIER_POINTER (name));
}
/* Maybe warn if shadowing something else. */
else if (warn_shadow
/* No shadow warnings for internally generated vars. */
&& DECL_SOURCE_LINE (x) != 0
/* No shadow warnings for vars made for inlining. */
&& ! DECL_FROM_INLINE (x))
{
if (TREE_CODE (x) == PARM_DECL
&& current_binding_level->level_chain->parm_flag)
/* Don't warn about the parm names in function declarator
within a function declarator.
It would be nice to avoid warning in any function
declarator in a declaration, as opposed to a definition,
but there is no way to tell it's not a definition. */
;
else if (oldlocal)
{
if (TREE_CODE (oldlocal) == PARM_DECL)
shadow_warning ("a parameter", name, oldlocal);
else
shadow_warning ("a previous local", name, oldlocal);
}
else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
&& IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
shadow_warning ("a global declaration", name,
IDENTIFIER_GLOBAL_VALUE (name));
}
}
/* Record a decl-node X as belonging to the current lexical scope.
Check for errors (such as an incompatible declaration for the same
name already seen in the same scope).
Returns either X or an old decl for the same name.
If an old decl is returned, it may have been smashed
to agree with what X says. */
tree
pushdecl (x)
tree x;
{
tree t;
tree name = DECL_NAME (x);
struct binding_level *b = current_binding_level;
/* Functions need the lang_decl data. */
if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
ggc_alloc_cleared (sizeof (struct lang_decl));
DECL_CONTEXT (x) = current_function_decl;
/* A local extern declaration for a function doesn't constitute nesting.
A local auto declaration does, since it's a forward decl
for a nested function coming later. */
if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
&& DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
DECL_CONTEXT (x) = 0;
if (name)
{
int different_binding_level = 0;
if (warn_nested_externs
&& DECL_EXTERNAL (x)
&& b != global_binding_level
&& x != IDENTIFIER_IMPLICIT_DECL (name)
/* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
&& !DECL_IN_SYSTEM_HEADER (x))
warning ("nested extern declaration of `%s'",
IDENTIFIER_POINTER (name));
t = lookup_name_current_level (name);
if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
{
t = IDENTIFIER_GLOBAL_VALUE (name);
/* Type decls at global scope don't conflict with externs declared
inside lexical blocks. */
if (! t || TREE_CODE (t) == TYPE_DECL)
/* If there's no visible global declaration, try for an
invisible one. */
t = IDENTIFIER_LIMBO_VALUE (name);
different_binding_level = 1;
}
if (t != 0 && t == error_mark_node)
/* error_mark_node is 0 for a while during initialization! */
{
t = 0;
error_with_decl (x, "`%s' used prior to declaration");
}
/* If this decl is `static' and an implicit decl was seen previously,
warn. */
if (TREE_PUBLIC (name)
/* Don't test for DECL_EXTERNAL, because grokdeclarator
sets this for all functions. */
&& ! TREE_PUBLIC (x)
&& (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
/* We used to warn also for explicit extern followed by static,
but sometimes you need to do it that way. */
&& IDENTIFIER_IMPLICIT_DECL (name) != 0)
{
pedwarn ("`%s' was declared implicitly `extern' and later `static'",
IDENTIFIER_POINTER (name));
pedwarn_with_file_and_line
(DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
"previous declaration of `%s'",
IDENTIFIER_POINTER (name));
TREE_THIS_VOLATILE (name) = 1;
}
if (t != 0 && duplicate_decls (x, t, different_binding_level))
{
if (TREE_CODE (t) == PARM_DECL)
{
/* Don't allow more than one "real" duplicate
of a forward parm decl. */
TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
return t;
}
return t;
}
/* If we are processing a typedef statement, generate a whole new
..._TYPE node (which will be just a variant of the existing
..._TYPE node with identical properties) and then install the
TYPE_DECL node generated to represent the typedef name as the
TYPE_NAME of this brand new (duplicate) ..._TYPE node.
The whole point here is to end up with a situation where each
and every ..._TYPE node the compiler creates will be uniquely
associated with AT MOST one node representing a typedef name.
This way, even though the compiler substitutes corresponding
..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
early on, later parts of the compiler can always do the reverse
translation and get back the corresponding typedef name. For
example, given:
typedef struct S MY_TYPE;
MY_TYPE object;
Later parts of the compiler might only know that `object' was of
type `struct S' if it were not for code just below. With this
code however, later parts of the compiler see something like:
struct S' == struct S
typedef struct S' MY_TYPE;
struct S' object;
And they can then deduce (from the node for type struct S') that
the original object declaration was:
MY_TYPE object;
Being able to do this is important for proper support of protoize,
and also for generating precise symbolic debugging information
which takes full account of the programmer's (typedef) vocabulary.
Obviously, we don't want to generate a duplicate ..._TYPE node if
the TYPE_DECL node that we are now processing really represents a
standard built-in type.
Since all standard types are effectively declared at line zero
in the source file, we can easily check to see if we are working
on a standard type by checking the current value of lineno. */
if (TREE_CODE (x) == TYPE_DECL)
{
if (DECL_SOURCE_LINE (x) == 0)
{
if (TYPE_NAME (TREE_TYPE (x)) == 0)
TYPE_NAME (TREE_TYPE (x)) = x;
}
else if (TREE_TYPE (x) != error_mark_node
&& DECL_ORIGINAL_TYPE (x) == NULL_TREE)
{
tree tt = TREE_TYPE (x);
DECL_ORIGINAL_TYPE (x) = tt;
tt = build_type_copy (tt);
TYPE_NAME (tt) = x;
TREE_USED (tt) = TREE_USED (x);
TREE_TYPE (x) = tt;
}
}
/* Multiple external decls of the same identifier ought to match.
We get warnings about inline functions where they are defined.
Avoid duplicate warnings where they are used. */
if (TREE_PUBLIC (x)
&& ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
{
tree decl;
if (IDENTIFIER_LIMBO_VALUE (name) != 0)
/* Decls in limbo are always extern, so no need to check that. */
decl = IDENTIFIER_LIMBO_VALUE (name);
else
decl = 0;
if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
/* If old decl is built-in, we already warned if we should. */
&& !DECL_BUILT_IN (decl))
{
pedwarn_with_decl (x,
"type mismatch with previous external decl");
pedwarn_with_decl (decl, "previous external decl of `%s'");
}
}
/* If a function has had an implicit declaration, and then is defined,
make sure they are compatible. */
if (IDENTIFIER_IMPLICIT_DECL (name) != 0
&& IDENTIFIER_GLOBAL_VALUE (name) == 0
&& TREE_CODE (x) == FUNCTION_DECL
&& ! comptypes (TREE_TYPE (x),
TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
{
warning_with_decl (x, "type mismatch with previous implicit declaration");
warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
"previous implicit declaration of `%s'");
}
/* This name is new in its binding level.
Install the new declaration and return it. */
if (b == global_binding_level)
{
/* Install a global value. */
/* If the first global decl has external linkage,
warn if we later see static one. */
if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
TREE_PUBLIC (name) = 1;
IDENTIFIER_GLOBAL_VALUE (name) = x;
/* We no longer care about any previous block level declarations. */
IDENTIFIER_LIMBO_VALUE (name) = 0;
/* Don't forget if the function was used via an implicit decl. */
if (IDENTIFIER_IMPLICIT_DECL (name)
&& TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
TREE_USED (x) = 1, TREE_USED (name) = 1;
/* Don't forget if its address was taken in that way. */
if (IDENTIFIER_IMPLICIT_DECL (name)
&& TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
TREE_ADDRESSABLE (x) = 1;
/* Warn about mismatches against previous implicit decl. */
if (IDENTIFIER_IMPLICIT_DECL (name) != 0
/* If this real decl matches the implicit, don't complain. */
&& ! (TREE_CODE (x) == FUNCTION_DECL
&& (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
== integer_type_node)))
pedwarn ("`%s' was previously implicitly declared to return `int'",
IDENTIFIER_POINTER (name));
/* If this decl is `static' and an `extern' was seen previously,
that is erroneous. */
if (TREE_PUBLIC (name)
&& ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
{
/* Okay to redeclare an ANSI built-in as static. */
if (t != 0 && DECL_BUILT_IN (t))
;
/* Okay to declare a non-ANSI built-in as anything. */
else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
;
/* Okay to have global type decl after an earlier extern
declaration inside a lexical block. */
else if (TREE_CODE (x) == TYPE_DECL)
;
else if (IDENTIFIER_IMPLICIT_DECL (name))
{
if (! TREE_THIS_VOLATILE (name))
pedwarn ("`%s' was declared implicitly `extern' and later `static'",
IDENTIFIER_POINTER (name));
}
else
pedwarn ("`%s' was declared `extern' and later `static'",
IDENTIFIER_POINTER (name));
}
}
else
{
/* Here to install a non-global value. */
tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
IDENTIFIER_LOCAL_VALUE (name) = x;
/* If this is an extern function declaration, see if we
have a global definition or declaration for the function. */
if (oldlocal == 0
&& oldglobal != 0
&& TREE_CODE (x) == FUNCTION_DECL
&& TREE_CODE (oldglobal) == FUNCTION_DECL
&& DECL_EXTERNAL (x)
&& ! DECL_DECLARED_INLINE_P (x))
{
/* We have one. Their types must agree. */
if (! comptypes (TREE_TYPE (x),
TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
else
{
/* Inner extern decl is inline if global one is.
Copy enough to really inline it. */
if (DECL_DECLARED_INLINE_P (oldglobal))
{
DECL_DECLARED_INLINE_P (x)
= DECL_DECLARED_INLINE_P (oldglobal);
DECL_INLINE (x) = DECL_INLINE (oldglobal);
DECL_INITIAL (x) = (current_function_decl == oldglobal
? 0 : DECL_INITIAL (oldglobal));
DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
DECL_RESULT (x) = DECL_RESULT (oldglobal);
TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
DECL_ABSTRACT_ORIGIN (x)
= DECL_ABSTRACT_ORIGIN (oldglobal);
}
/* Inner extern decl is built-in if global one is. */
if (DECL_BUILT_IN (oldglobal))
{
DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
}
/* Keep the arg types from a file-scope fcn defn. */
if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
&& DECL_INITIAL (oldglobal)
&& TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
TREE_TYPE (x) = TREE_TYPE (oldglobal);
}
}
#if 0
/* This case is probably sometimes the right thing to do. */
/* If we have a local external declaration,
then any file-scope declaration should not
have been static. */
if (oldlocal == 0 && oldglobal != 0
&& !TREE_PUBLIC (oldglobal)
&& DECL_EXTERNAL (x) && TREE_PUBLIC (x))
warning ("`%s' locally external but globally static",
IDENTIFIER_POINTER (name));
#endif
/* If we have a local external declaration,
and no file-scope declaration has yet been seen,
then if we later have a file-scope decl it must not be static. */
if (oldlocal == 0
&& DECL_EXTERNAL (x)
&& TREE_PUBLIC (x))
{
if (oldglobal == 0)
TREE_PUBLIC (name) = 1;
/* Save this decl, so that we can do type checking against
other decls after it falls out of scope.
Only save it once. This prevents temporary decls created in
expand_inline_function from being used here, since this
will have been set when the inline function was parsed.
It also helps give slightly better warnings. */
if (IDENTIFIER_LIMBO_VALUE (name) == 0)
IDENTIFIER_LIMBO_VALUE (name) = x;
}
warn_if_shadowing (x, oldlocal);
/* If storing a local value, there may already be one (inherited).
If so, record it for restoration when this binding level ends. */
if (oldlocal != 0)
b->shadowed = tree_cons (name, oldlocal, b->shadowed);
}
/* Keep list of variables in this level with incomplete type.
If the input is erroneous, we can have error_mark in the type
slot (e.g. "f(void a, ...)") - that doesn't count as an
incomplete type. */
if (TREE_TYPE (x) != error_mark_node
&& !COMPLETE_TYPE_P (TREE_TYPE (x)))
{
tree element = TREE_TYPE (x);
while (TREE_CODE (element) == ARRAY_TYPE)
element = TREE_TYPE (element);
if ((TREE_CODE (element) == RECORD_TYPE
|| TREE_CODE (element) == UNION_TYPE)
&& (TREE_CODE (x) != TYPE_DECL
|| TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE))
b->incomplete_list = tree_cons (NULL_TREE, x, b->incomplete_list);
}
}
/* Put decls on list in reverse order.
We will reverse them later if necessary. */
TREE_CHAIN (x) = b->names;
b->names = x;
return x;
}
/* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
tree
pushdecl_top_level (x)
tree x;
{
tree t;
struct binding_level *b = current_binding_level;
current_binding_level = global_binding_level;
t = pushdecl (x);
current_binding_level = b;
return t;
}
/* Generate an implicit declaration for identifier FUNCTIONID
as a function of type int (). Print a warning if appropriate. */
tree
implicitly_declare (functionid)
tree functionid;
{
tree decl;
int traditional_warning = 0;
/* Only one "implicit declaration" warning per identifier. */
int implicit_warning;
/* We used to reuse an old implicit decl here,
but this loses with inline functions because it can clobber
the saved decl chains. */
#if 0
if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
decl = IDENTIFIER_IMPLICIT_DECL (functionid);
else
#endif
decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
/* Warn of implicit decl following explicit local extern decl.
This is probably a program designed for traditional C. */
if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
traditional_warning = 1;
/* Warn once of an implicit declaration. */
implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
DECL_EXTERNAL (decl) = 1;
TREE_PUBLIC (decl) = 1;
/* Record that we have an implicit decl and this is it. */
IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
/* ANSI standard says implicit declarations are in the innermost block.
So we record the decl in the standard fashion. */
pushdecl (decl);
/* This is a no-op in c-lang.c or something real in objc-act.c. */
if (flag_objc)
objc_check_decl (decl);
rest_of_decl_compilation (decl, NULL, 0, 0);
if (implicit_warning)
implicit_decl_warning (functionid);
else if (warn_traditional && traditional_warning)
warning ("function `%s' was previously declared within a block",
IDENTIFIER_POINTER (functionid));
/* Write a record describing this implicit function declaration to the
prototypes file (if requested). */
gen_aux_info_record (decl, 0, 1, 0);
/* Possibly apply some default attributes to this implicit declaration. */
decl_attributes (&decl, NULL_TREE, 0);
return decl;
}
void
implicit_decl_warning (id)
tree id;
{
const char *name = IDENTIFIER_POINTER (id);
if (mesg_implicit_function_declaration == 2)
error ("implicit declaration of function `%s'", name);
else if (mesg_implicit_function_declaration == 1)
warning ("implicit declaration of function `%s'", name);
}
/* Return zero if the declaration NEWDECL is valid
when the declaration OLDDECL (assumed to be for the same name)
has already been seen.
Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
and 3 if it is a conflicting declaration. */
static int
redeclaration_error_message (newdecl, olddecl)
tree newdecl, olddecl;
{
if (TREE_CODE (newdecl) == TYPE_DECL)
{
/* Do not complain about type redeclarations where at least one
declaration was in a system header. */
if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
return 0;
return 1;
}
else if (TREE_CODE (newdecl) == FUNCTION_DECL)
{
/* Declarations of functions can insist on internal linkage
but they can't be inconsistent with internal linkage,
so there can be no error on that account.
However defining the same name twice is no good. */
if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
/* However, defining once as extern inline and a second
time in another way is ok. */
&& ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
&& ! (DECL_DECLARED_INLINE_P (newdecl)
&& DECL_EXTERNAL (newdecl))))
return 1;
return 0;
}
else if (DECL_CONTEXT (newdecl) == NULL_TREE)
{
/* Objects declared at top level: */
/* If at least one is a reference, it's ok. */
if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
return 0;
/* Reject two definitions. */
if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
return 1;
/* Now we have two tentative defs, or one tentative and one real def. */
/* Insist that the linkage match. */
if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
return 3;
return 0;
}
else if (current_binding_level->parm_flag
&& TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
return 0;
else
{
/* Newdecl has block scope. If olddecl has block scope also, then
reject two definitions, and reject a definition together with an
external reference. Otherwise, it is OK, because newdecl must
be an extern reference to olddecl. */
if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
&& DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
return 2;
return 0;
}
}
/* Get the LABEL_DECL corresponding to identifier ID as a label.
Create one if none exists so far for the current function.
This function is called for both label definitions and label references. */
tree
lookup_label (id)
tree id;
{
tree decl = IDENTIFIER_LABEL_VALUE (id);
if (current_function_decl == 0)
{
error ("label %s referenced outside of any function",
IDENTIFIER_POINTER (id));
return 0;
}
/* Use a label already defined or ref'd with this name. */
if (decl != 0)
{
/* But not if it is inherited and wasn't declared to be inheritable. */
if (DECL_CONTEXT (decl) != current_function_decl
&& ! C_DECLARED_LABEL_FLAG (decl))
return shadow_label (id);
return decl;
}
decl = build_decl (LABEL_DECL, id, void_type_node);
/* A label not explicitly declared must be local to where it's ref'd. */
DECL_CONTEXT (decl) = current_function_decl;
DECL_MODE (decl) = VOIDmode;
/* Say where one reference is to the label,
for the sake of the error if it is not defined. */
DECL_SOURCE_LINE (decl) = lineno;
DECL_SOURCE_FILE (decl) = input_filename;
IDENTIFIER_LABEL_VALUE (id) = decl;
named_labels = tree_cons (NULL_TREE, decl, named_labels);
return decl;
}
/* Make a label named NAME in the current function,
shadowing silently any that may be inherited from containing functions
or containing scopes.
Note that valid use, if the label being shadowed
comes from another scope in the same function,
requires calling declare_nonlocal_label right away. */
tree
shadow_label (name)
tree name;
{
tree decl = IDENTIFIER_LABEL_VALUE (name);
if (decl != 0)
{
tree dup;
/* Check to make sure that the label hasn't already been declared
at this label scope */
for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
if (TREE_VALUE (dup) == decl)
{
error ("duplicate label declaration `%s'",
IDENTIFIER_POINTER (name));
error_with_decl (TREE_VALUE (dup),
"this is a previous declaration");
/* Just use the previous declaration. */
return lookup_label (name);
}
shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
IDENTIFIER_LABEL_VALUE (name) = decl = 0;
}
return lookup_label (name);
}
/* Define a label, specifying the location in the source file.
Return the LABEL_DECL node for the label, if the definition is valid.
Otherwise return 0. */
tree
define_label (filename, line, name)
const char *filename;
int line;
tree name;
{
tree decl = lookup_label (name);
/* If label with this name is known from an outer context, shadow it. */
if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
{
shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
IDENTIFIER_LABEL_VALUE (name) = 0;
decl = lookup_label (name);
}
if (warn_traditional && !in_system_header && lookup_name (name))
warning_with_file_and_line (filename, line,
"traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
IDENTIFIER_POINTER (name));
if (DECL_INITIAL (decl) != 0)
{
error_with_file_and_line (filename, line, "duplicate label `%s'",
IDENTIFIER_POINTER (name));
return 0;
}
else
{
/* Mark label as having been defined. */
DECL_INITIAL (decl) = error_mark_node;
/* Say where in the source. */
DECL_SOURCE_FILE (decl) = filename;
DECL_SOURCE_LINE (decl) = line;
return decl;
}
}
/* Return the list of declarations of the current level.
Note that this list is in reverse order unless/until
you nreverse it; and when you do nreverse it, you must
store the result back using `storedecls' or you will lose. */
tree
getdecls ()
{
return current_binding_level->names;
}
/* Return the list of type-tags (for structs, etc) of the current level. */
tree
gettags ()
{
return current_binding_level->tags;
}
/* Store the list of declarations of the current level.
This is done for the parameter declarations of a function being defined,
after they are modified in the light of any missing parameters. */
static void
storedecls (decls)
tree decls;
{
current_binding_level->names = decls;
}
/* Similarly, store the list of tags of the current level. */
static void
storetags (tags)
tree tags;
{
current_binding_level->tags = tags;
}
/* Given NAME, an IDENTIFIER_NODE,
return the structure (or union or enum) definition for that name.
Searches binding levels from BINDING_LEVEL up to the global level.
If THISLEVEL_ONLY is nonzero, searches only the specified context
(but skips any tag-transparent contexts to find one that is
meaningful for tags).
CODE says which kind of type the caller wants;
it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
If the wrong kind of type is found, an error is reported. */
static tree
lookup_tag (code, name, binding_level, thislevel_only)
enum tree_code code;
struct binding_level *binding_level;
tree name;
int thislevel_only;
{
struct binding_level *level;
int thislevel = 1;
for (level = binding_level; level; level = level->level_chain)
{
tree tail;
for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
{
if (TREE_PURPOSE (tail) == name)
{
if (TREE_CODE (TREE_VALUE (tail)) != code)
{
/* Definition isn't the kind we were looking for. */
pending_invalid_xref = name;
pending_invalid_xref_file = input_filename;
pending_invalid_xref_line = lineno;
/* If in the same binding level as a declaration as a tag
of a different type, this must not be allowed to
shadow that tag, so give the error immediately.
(For example, "struct foo; union foo;" is invalid.) */
if (thislevel)
pending_xref_error ();
}
return TREE_VALUE (tail);
}
}
if (! level->tag_transparent)
{
if (thislevel_only)
return NULL_TREE;
thislevel = 0;
}
}
return NULL_TREE;
}
/* Print an error message now
for a recent invalid struct, union or enum cross reference.
We don't print them immediately because they are not invalid
when used in the `struct foo;' construct for shadowing. */
void
pending_xref_error ()
{
if (pending_invalid_xref != 0)
error_with_file_and_line (pending_invalid_xref_file,
pending_invalid_xref_line,
"`%s' defined as wrong kind of tag",
IDENTIFIER_POINTER (pending_invalid_xref));
pending_invalid_xref = 0;
}
/* Given a type, find the tag that was defined for it and return the tag name.
Otherwise return 0. */
static tree
lookup_tag_reverse (type)
tree type;
{
struct binding_level *level;
for (level = current_binding_level; level; level = level->level_chain)
{
tree tail;
for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
{
if (TREE_VALUE (tail) == type)
return TREE_PURPOSE (tail);
}
}
return NULL_TREE;
}
/* Look up NAME in the current binding level and its superiors
in the namespace of variables, functions and typedefs.
Return a ..._DECL node of some kind representing its definition,
or return 0 if it is undefined. */
tree
lookup_name (name)
tree name;
{
tree val;
if (current_binding_level != global_binding_level
&& IDENTIFIER_LOCAL_VALUE (name))
val = IDENTIFIER_LOCAL_VALUE (name);
else
val = IDENTIFIER_GLOBAL_VALUE (name);
return val;
}
/* Similar to `lookup_name' but look only at current binding level. */
tree
lookup_name_current_level (name)
tree name;
{
tree t;
if (current_binding_level == global_binding_level)
return IDENTIFIER_GLOBAL_VALUE (name);
if (IDENTIFIER_LOCAL_VALUE (name) == 0)
return 0;
for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
if (DECL_NAME (t) == name)
break;
return t;
}
/* Create the predefined scalar types of C,
and some nodes representing standard constants (0, 1, (void *) 0).
Initialize the global binding level.
Make definitions for built-in primitive functions. */
void
c_init_decl_processing ()
{
tree endlink;
tree ptr_ftype_void, ptr_ftype_ptr;
/* Adds some ggc roots, and reserved words for c-parse.in. */
c_parse_init ();
current_function_decl = NULL;
named_labels = NULL;
current_binding_level = NULL_BINDING_LEVEL;
free_binding_level = NULL_BINDING_LEVEL;
/* Make the binding_level structure for global names. */
pushlevel (0);
global_binding_level = current_binding_level;
build_common_tree_nodes (flag_signed_char);
c_common_nodes_and_builtins ();
boolean_type_node = integer_type_node;
boolean_true_node = integer_one_node;
boolean_false_node = integer_zero_node;
c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
TYPE_PRECISION (c_bool_type_node) = 1;
pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
c_bool_type_node));
c_bool_false_node = build_int_2 (0, 0);
TREE_TYPE (c_bool_false_node) = c_bool_type_node;
c_bool_true_node = build_int_2 (1, 0);
TREE_TYPE (c_bool_true_node) = c_bool_type_node;
endlink = void_list_node;
ptr_ftype_void = build_function_type (ptr_type_node, endlink);
ptr_ftype_ptr
= build_function_type (ptr_type_node,
tree_cons (NULL_TREE, ptr_type_node, endlink));
pedantic_lvalues = pedantic;
make_fname_decl = c_make_fname_decl;
start_fname_decls ();
}
/* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
decl, NAME is the initialization string and TYPE_DEP indicates whether
NAME depended on the type of the function. As we don't yet implement
delayed emission of static data, we mark the decl as emitted
so it is not placed in the output. Anything using it must therefore pull
out the STRING_CST initializer directly. This does mean that these names
are string merging candidates, which is wrong for C99's __func__. FIXME. */
static tree
c_make_fname_decl (id, type_dep)
tree id;
int type_dep;
{
const char *name = fname_as_string (type_dep);
tree decl, type, init;
size_t length = strlen (name);
type = build_array_type
(build_qualified_type (char_type_node, TYPE_QUAL_CONST),
build_index_type (size_int (length)));
decl = build_decl (VAR_DECL, id, type);
/* We don't push the decl, so have to set its context here. */
DECL_CONTEXT (decl) = current_function_decl;
TREE_STATIC (decl) = 1;
TREE_READONLY (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
init = build_string (length + 1, name);
TREE_TYPE (init) = type;
DECL_INITIAL (decl) = init;
TREE_USED (decl) = 1;
finish_decl (decl, init, NULL_TREE);
return decl;
}
/* Return a definition for a builtin function named NAME and whose data type
is TYPE. TYPE should be a function type with argument types.
FUNCTION_CODE tells later passes how to compile calls to this function.
See tree.h for its possible values.
If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
the name to be called if we can't opencode the function. If
ATTRS is nonzero, use that for the function's attribute list. */
tree
builtin_function (name, type, function_code, class, library_name, attrs)
const char *name;
tree type;
int function_code;
enum built_in_class class;
const char *library_name;
tree attrs;
{
tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
DECL_EXTERNAL (decl) = 1;
TREE_PUBLIC (decl) = 1;
if (library_name)
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
make_decl_rtl (decl, NULL);
pushdecl (decl);
DECL_BUILT_IN_CLASS (decl) = class;
DECL_FUNCTION_CODE (decl) = function_code;
/* Warn if a function in the namespace for users
is used without an occasion to consider it declared. */
if (name[0] != '_' || name[1] != '_')
C_DECL_ANTICIPATED (decl) = 1;
/* Possibly apply some default attributes to this built-in function. */
if (attrs)
decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
else
decl_attributes (&decl, NULL_TREE, 0);
return decl;
}
/* Apply default attributes to a function, if a system function with default
attributes. */
void
c_insert_default_attributes (decl)
tree decl;
{
if (!TREE_PUBLIC (decl))
return;
c_common_insert_default_attributes (decl);
}
/* Called when a declaration is seen that contains no names to declare.
If its type is a reference to a structure, union or enum inherited
from a containing scope, shadow that tag name for the current scope
with a forward reference.
If its type defines a new named structure or union
or defines an enum, it is valid but we need not do anything here.
Otherwise, it is an error. */
void
shadow_tag (declspecs)
tree declspecs;
{
shadow_tag_warned (declspecs, 0);
}
void
shadow_tag_warned (declspecs, warned)
tree declspecs;
int warned;
/* 1 => we have done a pedwarn. 2 => we have done a warning, but
no pedwarn. */
{
int found_tag = 0;
tree link;
tree specs, attrs;
pending_invalid_xref = 0;
/* Remove the attributes from declspecs, since they will confuse the
following code. */
split_specs_attrs (declspecs, &specs, &attrs);
for (link = specs; link; link = TREE_CHAIN (link))
{
tree value = TREE_VALUE (link);
enum tree_code code = TREE_CODE (value);
if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
/* Used to test also that TYPE_SIZE (value) != 0.
That caused warning for `struct foo;' at top level in the file. */
{
tree name = lookup_tag_reverse (value);
tree t;
found_tag++;
if (name == 0)
{
if (warned != 1 && code != ENUMERAL_TYPE)
/* Empty unnamed enum OK */
{
pedwarn ("unnamed struct/union that defines no instances");
warned = 1;
}
}
else
{
t = lookup_tag (code, name, current_binding_level, 1);
if (t == 0)
{
t = make_node (code);
pushtag (name, t);
}
}
}
else
{
if (!warned && ! in_system_header)
{
warning ("useless keyword or type name in empty declaration");
warned = 2;
}
}
}
if (found_tag > 1)
error ("two types specified in one empty declaration");
if (warned != 1)
{
if (found_tag == 0)
pedwarn ("empty declaration");
}
}
/* Construct an array declarator. EXPR is the expression inside [], or
NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
to the pointer to which a parameter array is converted). STATIC_P is
nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
is nonzero is the array is [*], a VLA of unspecified length which is
nevertheless a complete type (not currently implemented by GCC),
zero otherwise. The declarator is constructed as an ARRAY_REF
(to be decoded by grokdeclarator), whose operand 0 is what's on the
left of the [] (filled by in set_array_declarator_type) and operand 1
is the expression inside; whose TREE_TYPE is the type qualifiers and
which has TREE_STATIC set if "static" is used. */
tree
build_array_declarator (expr, quals, static_p, vla_unspec_p)
tree expr;
tree quals;
int static_p;
int vla_unspec_p;
{
tree decl;
decl = build_nt (ARRAY_REF, NULL_TREE, expr);
TREE_TYPE (decl) = quals;
TREE_STATIC (decl) = (static_p ? 1 : 0);
if (pedantic && !flag_isoc99)
{
if (static_p || quals != NULL_TREE)
pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
if (vla_unspec_p)
pedwarn ("ISO C90 does not support `[*]' array declarators");
}
if (vla_unspec_p)
warning ("GCC does not yet properly implement `[*]' array declarators");
return decl;
}
/* Set the type of an array declarator. DECL is the declarator, as
constructed by build_array_declarator; TYPE is what appears on the left
of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
abstract declarator, zero otherwise; this is used to reject static and
type qualifiers in abstract declarators, where they are not in the
C99 grammar. */
tree
set_array_declarator_type (decl, type, abstract_p)
tree decl;
tree type;
int abstract_p;
{
TREE_OPERAND (decl, 0) = type;
if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
error ("static or type qualifiers in abstract declarator");
return decl;
}
/* Decode a "typename", such as "int **", returning a ..._TYPE node. */
tree
groktypename (typename)
tree typename;
{
tree specs, attrs;
if (TREE_CODE (typename) != TREE_LIST)
return typename;
split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
/* Apply attributes. */
decl_attributes (&typename, attrs, 0);
return typename;
}
/* Return a PARM_DECL node for a given pair of specs and declarator. */
tree
groktypename_in_parm_context (typename)
tree typename;
{
if (TREE_CODE (typename) != TREE_LIST)
return typename;
return grokdeclarator (TREE_VALUE (typename),
TREE_PURPOSE (typename),
PARM, 0);
}
/* Decode a declarator in an ordinary declaration or data definition.
This is called as soon as the type information and variable name
have been parsed, before parsing the initializer if any.
Here we create the ..._DECL node, fill in its type,
and put it on the list of decls for the current context.
The ..._DECL node is returned as the value.
Exception: for arrays where the length is not specified,
the type is left null, to be filled in by `finish_decl'.
Function definitions do not come here; they go to start_function
instead. However, external and forward declarations of functions
do go through here. Structure field declarations are done by
grokfield and not through here. */
tree
start_decl (declarator, declspecs, initialized, attributes)
tree declarator, declspecs;
int initialized;
tree attributes;
{
tree decl;
tree tem;
/* An object declared as __attribute__((deprecated)) suppresses
warnings of uses of other deprecated items. */
if (lookup_attribute ("deprecated", attributes))
deprecated_state = DEPRECATED_SUPPRESS;
decl = grokdeclarator (declarator, declspecs,
NORMAL, initialized);
deprecated_state = DEPRECATED_NORMAL;
if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl)))
warning_with_decl (decl, "`%s' is usually a function");
if (initialized)
/* Is it valid for this decl to have an initializer at all?
If not, set INITIALIZED to zero, which will indirectly
tell `finish_decl' to ignore the initializer once it is parsed. */
switch (TREE_CODE (decl))
{
case TYPE_DECL:
error ("typedef `%s' is initialized (use __typeof__ instead)",
IDENTIFIER_POINTER (DECL_NAME (decl)));
initialized = 0;
break;
case FUNCTION_DECL:
error ("function `%s' is initialized like a variable",
IDENTIFIER_POINTER (DECL_NAME (decl)));
initialized = 0;
break;
case PARM_DECL:
/* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
error ("parameter `%s' is initialized",
IDENTIFIER_POINTER (DECL_NAME (decl)));
initialized = 0;
break;
default:
/* Don't allow initializations for incomplete types
except for arrays which might be completed by the initialization. */
/* This can happen if the array size is an undefined macro. We already
gave a warning, so we don't need another one. */
if (TREE_TYPE (decl) == error_mark_node)
initialized = 0;
else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
{
/* A complete type is ok if size is fixed. */
if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
|| C_DECL_VARIABLE_SIZE (decl))
{
error ("variable-sized object may not be initialized");
initialized = 0;
}
}
else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
{
error ("variable `%s' has initializer but incomplete type",
IDENTIFIER_POINTER (DECL_NAME (decl)));
initialized = 0;
}
else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
{
error ("elements of array `%s' have incomplete type",
IDENTIFIER_POINTER (DECL_NAME (decl)));
initialized = 0;
}
}
if (initialized)
{
#if 0
/* Seems redundant with grokdeclarator. */
if (current_binding_level != global_binding_level
&& DECL_EXTERNAL (decl)
&& TREE_CODE (decl) != FUNCTION_DECL)
warning ("declaration of `%s' has `extern' and is initialized",
IDENTIFIER_POINTER (DECL_NAME (decl)));
#endif
DECL_EXTERNAL (decl) = 0;
if (current_binding_level == global_binding_level)
TREE_STATIC (decl) = 1;
/* Tell `pushdecl' this is an initialized decl
even though we don't yet have the initializer expression.
Also tell `finish_decl' it may store the real initializer. */
DECL_INITIAL (decl) = error_mark_node;
}
/* If this is a function declaration, write a record describing it to the
prototypes file (if requested). */
if (TREE_CODE (decl) == FUNCTION_DECL)
gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
/* ANSI specifies that a tentative definition which is not merged with
a non-tentative definition behaves exactly like a definition with an
initializer equal to zero. (Section 3.7.2)
-fno-common gives strict ANSI behavior, though this tends to break
a large body of code that grew up without this rule.
Thread-local variables are never common, since there's no entrenched
body of code to break, and it allows more efficient variable references
in the presense of dynamic linking. */
if (TREE_CODE (decl) == VAR_DECL
&& !initialized
&& TREE_PUBLIC (decl)
&& !DECL_THREAD_LOCAL (decl)
&& !flag_no_common)
DECL_COMMON (decl) = 1;
/* Set attributes here so if duplicate decl, will have proper attributes. */
decl_attributes (&decl, attributes, 0);
/* If #pragma weak was used, mark the decl weak now. */
if (current_binding_level == global_binding_level)
maybe_apply_pragma_weak (decl);
if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl)
&& DECL_UNINLINABLE (decl)
&& lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
warning_with_decl (decl,
"inline function `%s' given attribute noinline");
/* Add this decl to the current binding level.
TEM may equal DECL or it may be a previous decl of the same name. */
tem = pushdecl (decl);
/* For a local variable, define the RTL now. */
if (current_binding_level != global_binding_level
/* But not if this is a duplicate decl
and we preserved the rtl from the previous one
(which may or may not happen). */
&& !DECL_RTL_SET_P (tem)
&& !DECL_CONTEXT (tem))
{
if (TREE_TYPE (tem) != error_mark_node
&& COMPLETE_TYPE_P (TREE_TYPE (tem)))
expand_decl (tem);
else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
&& DECL_INITIAL (tem) != 0)
expand_decl (tem);
}
return tem;
}
/* Finish processing of a declaration;
install its initial value.
If the length of an array type is not known before,
it must be determined now, from the initial value, or it is an error. */
void
finish_decl (decl, init, asmspec_tree)
tree decl, init;
tree asmspec_tree;
{
tree type = TREE_TYPE (decl);
int was_incomplete = (DECL_SIZE (decl) == 0);
const char *asmspec = 0;
/* If a name was specified, get the string. */
if (current_binding_level == global_binding_level)
asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
if (asmspec_tree)
asmspec = TREE_STRING_POINTER (asmspec_tree);
/* If `start_decl' didn't like having an initialization, ignore it now. */
if (init != 0 && DECL_INITIAL (decl) == 0)
init = 0;
/* Don't crash if parm is initialized. */
if (TREE_CODE (decl) == PARM_DECL)
init = 0;
if (init)
store_init_value (decl, init);
/* Deduce size of array from initialization, if not already known */
if (TREE_CODE (type) == ARRAY_TYPE
&& TYPE_DOMAIN (type) == 0
&& TREE_CODE (decl) != TYPE_DECL)
{
int do_default
= (TREE_STATIC (decl)
/* Even if pedantic, an external linkage array
may have incomplete type at first. */
? pedantic && !TREE_PUBLIC (decl)
: !DECL_EXTERNAL (decl));
int failure
= complete_array_type (type, DECL_INITIAL (decl), do_default);
/* Get the completed type made by complete_array_type. */
type = TREE_TYPE (decl);
if (failure == 1)
error_with_decl (decl, "initializer fails to determine size of `%s'");
else if (failure == 2)
{
if (do_default)
error_with_decl (decl, "array size missing in `%s'");
/* If a `static' var's size isn't known,
make it extern as well as static, so it does not get
allocated.
If it is not `static', then do not mark extern;
finish_incomplete_decl will give it a default size
and it will get allocated. */
else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
DECL_EXTERNAL (decl) = 1;
}
/* TYPE_MAX_VALUE is always one less than the number of elements
in the array, because we start counting at zero. Therefore,
warn only if the value is less than zero. */
else if (pedantic && TYPE_DOMAIN (type) != 0
&& tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
error_with_decl (decl, "zero or negative size array `%s'");
layout_decl (decl, 0);
}
if (TREE_CODE (decl) == VAR_DECL)
{
if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
&& COMPLETE_TYPE_P (TREE_TYPE (decl)))
layout_decl (decl, 0);
if (DECL_SIZE (decl) == 0
/* Don't give an error if we already gave one earlier. */
&& TREE_TYPE (decl) != error_mark_node
&& (TREE_STATIC (decl)
?
/* A static variable with an incomplete type
is an error if it is initialized.
Also if it is not file scope.
Otherwise, let it through, but if it is not `extern'
then it may cause an error message later. */
(DECL_INITIAL (decl) != 0
|| DECL_CONTEXT (decl) != 0)
:
/* An automatic variable with an incomplete type
is an error. */
!DECL_EXTERNAL (decl)))
{
error_with_decl (decl, "storage size of `%s' isn't known");
TREE_TYPE (decl) = error_mark_node;
}
if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
&& DECL_SIZE (decl) != 0)
{
if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
constant_expression_warning (DECL_SIZE (decl));
else
error_with_decl (decl, "storage size of `%s' isn't constant");
}
if (TREE_USED (type))
TREE_USED (decl) = 1;
}
/* If this is a function and an assembler name is specified, it isn't
builtin any more. Also reset DECL_RTL so we can give it its new
name. */
if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
{
DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
SET_DECL_RTL (decl, NULL_RTX);
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
}
/* Output the assembler code and/or RTL code for variables and functions,
unless the type is an undefined structure or union.
If not, it will get done when the type is completed. */
if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
{
/* This is a no-op in c-lang.c or something real in objc-act.c. */
if (flag_objc)
objc_check_decl (decl);
if (!DECL_CONTEXT (decl))
{
if (DECL_INITIAL (decl) == NULL_TREE
|| DECL_INITIAL (decl) == error_mark_node)
/* Don't output anything
when a tentative file-scope definition is seen.
But at end of compilation, do output code for them. */
DECL_DEFER_OUTPUT (decl) = 1;
rest_of_decl_compilation (decl, asmspec,
(DECL_CONTEXT (decl) == 0
|| TREE_ASM_WRITTEN (decl)), 0);
}
else
{
/* This is a local variable. If there is an ASMSPEC, the
user has requested that we handle it specially. */
if (asmspec)
{
/* In conjunction with an ASMSPEC, the `register'
keyword indicates that we should place the variable
in a particular register. */
if (DECL_REGISTER (decl))
DECL_C_HARD_REGISTER (decl) = 1;
/* If this is not a static variable, issue a warning.
It doesn't make any sense to give an ASMSPEC for an
ordinary, non-register local variable. Historically,
GCC has accepted -- but ignored -- the ASMSPEC in
this case. */
if (TREE_CODE (decl) == VAR_DECL
&& !DECL_REGISTER (decl)
&& !TREE_STATIC (decl))
warning_with_decl (decl,
"ignoring asm-specifier for non-static local variable `%s'");
else
SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
}
if (TREE_CODE (decl) != FUNCTION_DECL)
add_decl_stmt (decl);
}
if (DECL_CONTEXT (decl) != 0)
{
/* Recompute the RTL of a local array now
if it used to be an incomplete type. */
if (was_incomplete
&& ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
{
/* If we used it already as memory, it must stay in memory. */
TREE_ADDRESSABLE (decl) = TREE_USED (decl);
/* If it's still incomplete now, no init will save it. */
if (DECL_SIZE (decl) == 0)
DECL_INITIAL (decl) = 0;
}
}
}
if (TREE_CODE (decl) == TYPE_DECL)
{
/* This is a no-op in c-lang.c or something real in objc-act.c. */
if (flag_objc)
objc_check_decl (decl);
rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
}
/* At the end of a declaration, throw away any variable type sizes
of types defined inside that declaration. There is no use
computing them in the following function definition. */
if (current_binding_level == global_binding_level)
get_pending_sizes ();
/* Install a cleanup (aka destructor) if one was given. */
if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
{
tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
if (attr)
{
static bool eh_initialized_p;
tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
tree cleanup_decl = lookup_name (cleanup_id);
tree cleanup;
/* Build "cleanup(&decl)" for the destructor. */
cleanup = build_unary_op (ADDR_EXPR, decl, 0);
cleanup = build_tree_list (NULL_TREE, cleanup);
cleanup = build_function_call (cleanup_decl, cleanup);
/* Don't warn about decl unused; the cleanup uses it. */
TREE_USED (decl) = 1;
/* Initialize EH, if we've been told to do so. */
if (flag_exceptions && !eh_initialized_p)
{
eh_initialized_p = true;
eh_personality_libfunc
= init_one_libfunc (USING_SJLJ_EXCEPTIONS
? "__gcc_personality_sj0"
: "__gcc_personality_v0");
using_eh_for_cleanups ();
}
add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
}
}
}
/* Given a parsed parameter declaration,
decode it into a PARM_DECL and push that on the current binding level.
Also, for the sake of forward parm decls,
record the given order of parms in `parm_order'. */
void
push_parm_decl (parm)
tree parm;
{
tree decl;
int old_immediate_size_expand = immediate_size_expand;
/* Don't try computing parm sizes now -- wait till fn is called. */
immediate_size_expand = 0;
decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
decl_attributes (&decl, TREE_VALUE (parm), 0);
#if 0
if (DECL_NAME (decl))
{
tree olddecl;
olddecl = lookup_name (DECL_NAME (decl));
if (