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/* Subroutines for insn-output.c for Windows NT.
Contributed by Douglas Rupp (drupp@cs.washington.edu)
Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "output.h"
#include "tree.h"
#include "flags.h"
#include "tm_p.h"
#include "toplev.h"
#include "hashtab.h"
#include "ggc.h"
/* i386/PE specific attribute support.
i386/PE has two new attributes:
dllexport - for exporting a function/variable that will live in a dll
dllimport - for importing a function/variable from a dll
Microsoft allows multiple declspecs in one __declspec, separating
them with spaces. We do NOT support this. Instead, use __declspec
multiple times.
*/
static tree associated_type PARAMS ((tree));
const char * gen_stdcall_suffix PARAMS ((tree));
int i386_pe_dllexport_p PARAMS ((tree));
int i386_pe_dllimport_p PARAMS ((tree));
void i386_pe_mark_dllexport PARAMS ((tree));
void i386_pe_mark_dllimport PARAMS ((tree));
/* Handle a "dllimport" or "dllexport" attribute;
arguments as in struct attribute_spec.handler. */
tree
ix86_handle_dll_attribute (pnode, name, args, flags, no_add_attrs)
tree * pnode;
tree name;
tree args;
int flags;
bool *no_add_attrs;
{
tree node = *pnode;
/* These attributes may apply to structure and union types being created,
but otherwise should pass to the declaration involved. */
if (!DECL_P (node))
{
if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
| (int) ATTR_FLAG_ARRAY_NEXT))
{
*no_add_attrs = true;
return tree_cons (name, args, NULL_TREE);
}
if (TREE_CODE (node) != RECORD_TYPE && TREE_CODE (node) != UNION_TYPE)
{
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Report error on dllimport ambiguities seen now before they cause
any damage. */
else if (is_attribute_p ("dllimport", name))
{
/* Like MS, treat definition of dllimported variables and
non-inlined functions on declaration as syntax errors.
We allow the attribute for function definitions if declared
inline, but just ignore it in i386_pe_dllimport_p. */
if (TREE_CODE (node) == FUNCTION_DECL && DECL_INITIAL (node)
&& !DECL_INLINE (node))
{
error_with_decl (node, "function `%s' definition is marked dllimport.");
*no_add_attrs = true;
}
else if (TREE_CODE (node) == VAR_DECL)
{
if (DECL_INITIAL (node))
{
error_with_decl (node,"variable `%s' definition is marked dllimport.");
*no_add_attrs = true;
}
/* `extern' needn't be specified with dllimport.
Specify `extern' now and hope for the best. Sigh. */
DECL_EXTERNAL (node) = 1;
/* Also, implicitly give dllimport'd variables declared within
a function global scope, unless declared static. */
if (current_function_decl != NULL_TREE && !TREE_STATIC (node))
TREE_PUBLIC (node) = 1;
}
}
/* Report error if symbol is not accessible at global scope. */
if (!TREE_PUBLIC (node)
&& (TREE_CODE (node) == VAR_DECL
|| TREE_CODE (node) == FUNCTION_DECL))
{
error_with_decl (node, "external linkage required for symbol '%s' because of '%s' attribute.",
IDENTIFIER_POINTER (name));
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "shared" attribute;
arguments as in struct attribute_spec.handler. */
tree
ix86_handle_shared_attribute (node, name, args, flags, no_add_attrs)
tree *node;
tree name;
tree args ATTRIBUTE_UNUSED;
int flags ATTRIBUTE_UNUSED;
bool *no_add_attrs;
{
if (TREE_CODE (*node) != VAR_DECL)
{
warning ("`%s' attribute only applies to variables",
IDENTIFIER_POINTER (name));
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Return the type that we should use to determine if DECL is
imported or exported. */
static tree
associated_type (decl)
tree decl;
{
tree t = NULL_TREE;
/* In the C++ frontend, DECL_CONTEXT for a method doesn't actually refer
to the containing class. So we look at the 'this' arg. */
if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
{
/* Artificial methods are not affected by the import/export status of
their class unless they are virtual. */
if (! DECL_ARTIFICIAL (decl) || DECL_VINDEX (decl))
t = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl))));
}
else if (DECL_CONTEXT (decl)
&& TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (decl))) == 't')
t = DECL_CONTEXT (decl);
return t;
}
/* Return nonzero if DECL is a dllexport'd object. */
int
i386_pe_dllexport_p (decl)
tree decl;
{
tree exp;
if (TREE_CODE (decl) != VAR_DECL
&& TREE_CODE (decl) != FUNCTION_DECL)
return 0;
exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
if (exp)
return 1;
/* Class members get the dllexport status of their class. */
if (associated_type (decl))
{
exp = lookup_attribute ("dllexport",
TYPE_ATTRIBUTES (associated_type (decl)));
if (exp)
return 1;
}
return 0;
}
/* Return nonzero if DECL is a dllimport'd object. */
int
i386_pe_dllimport_p (decl)
tree decl;
{
tree imp;
int context_imp = 0;
if (TREE_CODE (decl) == FUNCTION_DECL
&& TARGET_NOP_FUN_DLLIMPORT)
return 0;
if (TREE_CODE (decl) != VAR_DECL
&& TREE_CODE (decl) != FUNCTION_DECL)
return 0;
imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl));
/* Class members get the dllimport status of their class. */
if (!imp && associated_type (decl))
{
imp = lookup_attribute ("dllimport",
TYPE_ATTRIBUTES (associated_type (decl)));
if (imp)
context_imp = 1;
}
if (imp)
{
/* Don't mark defined functions as dllimport. If the definition
itself was marked with dllimport, than ix86_handle_dll_attribute
reports an error. This handles the case when the definition
overrides an earlier declaration. */
if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)
&& !DECL_INLINE (decl))
{
/* Don't warn about artificial methods. */
if (!DECL_ARTIFICIAL (decl))
warning_with_decl (decl,"function '%s' is defined after prior declaration as dllimport: attribute ignored.");
return 0;
}
/* We ignore the dllimport attribute for inline member functions.
This differs from MSVC behaviour which treats it like GNUC
'extern inline' extension. */
else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
{
if (extra_warnings)
warning_with_decl (decl, "inline function '%s' is declared as dllimport: attribute ignored.");
return 0;
}
/* Don't allow definitions of static data members in dllimport class,
Just ignore attribute for vtable data. */
else if (TREE_CODE (decl) == VAR_DECL
&& TREE_STATIC (decl) && TREE_PUBLIC (decl)
&& !DECL_EXTERNAL (decl) && context_imp)
{
if (!DECL_VIRTUAL_P (decl))
error_with_decl (decl, "definition of static data member '%s' of dllimport'd class.");
return 0;
}
/* Since we can't treat a pointer to a dllimport'd symbol as a
constant address, we turn off the attribute on C++ virtual
methods to allow creation of vtables using thunks. */
else if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE
&& (DECL_VIRTUAL_P (decl)))
return 0;
return 1;
}
return 0;
}
/* Return nonzero if SYMBOL is marked as being dllexport'd. */
int
i386_pe_dllexport_name_p (symbol)
const char *symbol;
{
return symbol[0] == DLL_IMPORT_EXPORT_PREFIX
&& symbol[1] == 'e' && symbol[2] == '.';
}
/* Return nonzero if SYMBOL is marked as being dllimport'd. */
int
i386_pe_dllimport_name_p (symbol)
const char *symbol;
{
return symbol[0] == DLL_IMPORT_EXPORT_PREFIX
&& symbol[1] == 'i' && symbol[2] == '.';
}
/* Mark a DECL as being dllexport'd.
Note that we override the previous setting (eg: dllimport). */
void
i386_pe_mark_dllexport (decl)
tree decl;
{
const char *oldname;
char *newname;
rtx rtlname;
tree idp;
rtlname = XEXP (DECL_RTL (decl), 0);
if (GET_CODE (rtlname) == SYMBOL_REF)
oldname = XSTR (rtlname, 0);
else if (GET_CODE (rtlname) == MEM
&& GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
oldname = XSTR (XEXP (rtlname, 0), 0);
else
abort ();
if (i386_pe_dllimport_name_p (oldname))
{
warning_with_decl (decl,"inconsistent dll linkage for '%s': dllexport assumed.");
/* Remove DLL_IMPORT_PREFIX. */
oldname += 9;
DECL_NON_ADDR_CONST_P (decl) = 0;
}
else if (i386_pe_dllexport_name_p (oldname))
return; /* already done */
newname = alloca (strlen (oldname) + 4);
sprintf (newname, "%ce.%s", DLL_IMPORT_EXPORT_PREFIX, oldname);
/* We pass newname through get_identifier to ensure it has a unique
address. RTL processing can sometimes peek inside the symbol ref
and compare the string's addresses to see if two symbols are
identical. */
idp = get_identifier (newname);
XEXP (DECL_RTL (decl), 0) =
gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
}
/* Mark a DECL as being dllimport'd. */
void
i386_pe_mark_dllimport (decl)
tree decl;
{
const char *oldname;
char *newname;
tree idp;
rtx rtlname, newrtl;
rtlname = XEXP (DECL_RTL (decl), 0);
if (GET_CODE (rtlname) == SYMBOL_REF)
oldname = XSTR (rtlname, 0);
else if (GET_CODE (rtlname) == MEM
&& GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
oldname = XSTR (XEXP (rtlname, 0), 0);
else
abort ();
if (i386_pe_dllexport_name_p (oldname))
{
error ("`%s' declared as both exported to and imported from a DLL",
IDENTIFIER_POINTER (DECL_NAME (decl)));
return;
}
else if (i386_pe_dllimport_name_p (oldname))
{
/* Already done, but do a sanity check to prevent assembler errors. */
if (!DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
{
error_with_decl (decl, "failure in redeclaration of '%s': dllimport'd symbol lacks external linkage.");
abort();
}
return;
}
newname = alloca (strlen (oldname) + 11);
sprintf (newname, "%ci._imp__%s", DLL_IMPORT_EXPORT_PREFIX, oldname);
/* We pass newname through get_identifier to ensure it has a unique
address. RTL processing can sometimes peek inside the symbol ref
and compare the string's addresses to see if two symbols are
identical. */
idp = get_identifier (newname);
newrtl = gen_rtx (MEM, Pmode,
gen_rtx (SYMBOL_REF, Pmode,
IDENTIFIER_POINTER (idp)));
XEXP (DECL_RTL (decl), 0) = newrtl;
/* Can't treat a pointer to this as a constant address */
DECL_NON_ADDR_CONST_P (decl) = 1;
}
/* Return string which is the former assembler name modified with a
suffix consisting of an atsign (@) followed by the number of bytes of
arguments */
const char *
gen_stdcall_suffix (decl)
tree decl;
{
int total = 0;
/* ??? This probably should use XSTR (XEXP (DECL_RTL (decl), 0), 0) instead
of DECL_ASSEMBLER_NAME. */
const char *asmname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
char *newsym;
if (TYPE_ARG_TYPES (TREE_TYPE (decl)))
if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (decl))))
== void_type_node)
{
tree formal_type = TYPE_ARG_TYPES (TREE_TYPE (decl));
while (TREE_VALUE (formal_type) != void_type_node)
{
int parm_size
= TREE_INT_CST_LOW (TYPE_SIZE (TREE_VALUE (formal_type)));
/* Must round up to include padding. This is done the same
way as in store_one_arg. */
parm_size = ((parm_size + PARM_BOUNDARY - 1)
/ PARM_BOUNDARY * PARM_BOUNDARY);
total += parm_size;
formal_type = TREE_CHAIN (formal_type);
}
}
newsym = xmalloc (strlen (asmname) + 10);
sprintf (newsym, "%s@%d", asmname, total/BITS_PER_UNIT);
return IDENTIFIER_POINTER (get_identifier (newsym));
}
void
i386_pe_encode_section_info (decl, first)
tree decl;
int first ATTRIBUTE_UNUSED;
{
/* This bit is copied from i386.h. */
if (optimize > 0 && TREE_CONSTANT (decl)
&& (!flag_writable_strings || TREE_CODE (decl) != STRING_CST))
{
rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd'
? TREE_CST_RTL (decl) : DECL_RTL (decl));
SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1;
}
if (TREE_CODE (decl) == FUNCTION_DECL)
if (lookup_attribute ("stdcall",
TYPE_ATTRIBUTES (TREE_TYPE (decl))))
XEXP (DECL_RTL (decl), 0) =
gen_rtx (SYMBOL_REF, Pmode, gen_stdcall_suffix (decl));
/* Mark the decl so we can tell from the rtl whether the object is
dllexport'd or dllimport'd. This also handles dllexport/dllimport
override semantics. */
if (i386_pe_dllexport_p (decl))
i386_pe_mark_dllexport (decl);
else if (i386_pe_dllimport_p (decl))
i386_pe_mark_dllimport (decl);
/* It might be that DECL has already been marked as dllimport, but a
subsequent definition nullified that. The attribute is gone but
DECL_RTL still has (DLL_IMPORT_EXPORT_PREFIX)i._imp__foo. We need
to remove that. Ditto for the DECL_NON_ADDR_CONST_P flag. */
else if ((TREE_CODE (decl) == FUNCTION_DECL
|| TREE_CODE (decl) == VAR_DECL)
&& DECL_RTL (decl) != NULL_RTX
&& GET_CODE (DECL_RTL (decl)) == MEM
&& GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
&& GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
&& i386_pe_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
{
const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
tree idp = get_identifier (oldname + 9);
rtx newrtl = gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
warning_with_decl (decl, "'%s' %s after being referenced with dllimport linkage.",
(DECL_INITIAL (decl) || !DECL_EXTERNAL (decl))
? "defined locally" : "redeclared without dllimport attribute");
XEXP (DECL_RTL (decl), 0) = newrtl;
DECL_NON_ADDR_CONST_P (decl) = 0;
/* We previously set TREE_PUBLIC and DECL_EXTERNAL.
We leave these alone for now. */
}
}
/* Strip only the leading encoding, leaving the stdcall suffix. */
const char *
i386_pe_strip_name_encoding (str)
const char *str;
{
if (*str == DLL_IMPORT_EXPORT_PREFIX)
str += 3;
if (*str == '*')
str += 1;
return str;
}
/* Also strip the stdcall suffix. */
const char *
i386_pe_strip_name_encoding_full (str)
const char *str;
{
const char *p;
const char *name = i386_pe_strip_name_encoding (str);
p = strchr (name, '@');
if (p)
return ggc_alloc_string (name, p - name);
return name;
}
void
i386_pe_unique_section (decl, reloc)
tree decl;
int reloc;
{
int len;
const char *name, *prefix;
char *string;
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
name = i386_pe_strip_name_encoding_full (name);
/* The object is put in, for example, section .text$foo.
The linker will then ultimately place them in .text
(everything from the $ on is stripped). Don't put
read-only data in .rdata section to avoid a PE linker
bug when .rdata$* grouped sections are used in code
without a .rdata section. */
if (TREE_CODE (decl) == FUNCTION_DECL)
prefix = ".text$";
else if (decl_readonly_section (decl, reloc))
prefix = ".rdata$";
else
prefix = ".data$";
len = strlen (name) + strlen (prefix);
string = alloca (len + 1);
sprintf (string, "%s%s", prefix, name);
DECL_SECTION_NAME (decl) = build_string (len, string);
}
/* Select a set of attributes for section NAME based on the properties
of DECL and whether or not RELOC indicates that DECL's initializer
might contain runtime relocations.
We make the section read-only and executable for a function decl,
read-only for a const data decl, and writable for a non-const data decl.
If the section has already been defined, to not allow it to have
different attributes, as (1) this is ambiguous since we're not seeing
all the declarations up front and (2) some assemblers (e.g. SVR4)
do not recoginize section redefinitions. */
/* ??? This differs from the "standard" PE implementation in that we
handle the SHARED variable attribute. Should this be done for all
PE targets? */
#define SECTION_PE_SHARED SECTION_MACH_DEP
unsigned int
i386_pe_section_type_flags (decl, name, reloc)
tree decl;
const char *name;
int reloc;
{
static htab_t htab;
unsigned int flags;
unsigned int **slot;
/* The names we put in the hashtable will always be the unique
versions gived to us by the stringtable, so we can just use
their addresses as the keys. */
if (!htab)
htab = htab_create (31, htab_hash_pointer, htab_eq_pointer, NULL);
if (decl && TREE_CODE (decl) == FUNCTION_DECL)
flags = SECTION_CODE;
else if (decl && decl_readonly_section (decl, reloc))
flags = 0;
else
{
flags = SECTION_WRITE;
if (decl && TREE_CODE (decl) == VAR_DECL
&& lookup_attribute ("shared", DECL_ATTRIBUTES (decl)))
flags |= SECTION_PE_SHARED;
}
if (decl && DECL_ONE_ONLY (decl))
flags |= SECTION_LINKONCE;
/* See if we already have an entry for this section. */
slot = (unsigned int **) htab_find_slot (htab, name, INSERT);
if (!*slot)
{
*slot = (unsigned int *) xmalloc (sizeof (unsigned int));
**slot = flags;
}
else
{
if (decl && **slot != flags)
error_with_decl (decl, "%s causes a section type conflict");
}
return flags;
}
void
i386_pe_asm_named_section (name, flags)
const char *name;
unsigned int flags;
{
char flagchars[8], *f = flagchars;
if (flags & SECTION_CODE)
*f++ = 'x';
if (flags & SECTION_WRITE)
*f++ = 'w';
if (flags & SECTION_PE_SHARED)
*f++ = 's';
*f = '\0';
fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
if (flags & SECTION_LINKONCE)
{
/* Functions may have been compiled at various levels of
optimization so we can't use `same_size' here.
Instead, have the linker pick one. */
fprintf (asm_out_file, "\t.linkonce %s\n",
(flags & SECTION_CODE ? "discard" : "same_size"));
}
}
/* The Microsoft linker requires that every function be marked as
DT_FCN. When using gas on cygwin, we must emit appropriate .type
directives. */
#include "gsyms.h"
/* Mark a function appropriately. This should only be called for
functions for which we are not emitting COFF debugging information.
FILE is the assembler output file, NAME is the name of the
function, and PUBLIC is nonzero if the function is globally
visible. */
void
i386_pe_declare_function_type (file, name, public)
FILE *file;
const char *name;
int public;
{
fprintf (file, "\t.def\t");
assemble_name (file, name);
fprintf (file, ";\t.scl\t%d;\t.type\t%d;\t.endef\n",
public ? (int) C_EXT : (int) C_STAT,
(int) DT_FCN << N_BTSHFT);
}
/* Keep a list of external functions. */
struct extern_list
{
struct extern_list *next;
const char *name;
};
static struct extern_list *extern_head;
/* Assemble an external function reference. We need to keep a list of
these, so that we can output the function types at the end of the
assembly. We can't output the types now, because we might see a
definition of the function later on and emit debugging information
for it then. */
void
i386_pe_record_external_function (name)
const char *name;
{
struct extern_list *p;
p = (struct extern_list *) xmalloc (sizeof *p);
p->next = extern_head;
p->name = name;
extern_head = p;
}
/* Keep a list of exported symbols. */
struct export_list
{
struct export_list *next;
const char *name;
int is_data; /* used to type tag exported symbols. */
};
static struct export_list *export_head;
/* Assemble an export symbol entry. We need to keep a list of
these, so that we can output the export list at the end of the
assembly. We used to output these export symbols in each function,
but that causes problems with GNU ld when the sections are
linkonce. */
void
i386_pe_record_exported_symbol (name, is_data)
const char *name;
int is_data;
{
struct export_list *p;
p = (struct export_list *) xmalloc (sizeof *p);
p->next = export_head;
p->name = name;
p->is_data = is_data;
export_head = p;
}
/* This is called at the end of assembly. For each external function
which has not been defined, we output a declaration now. We also
output the .drectve section. */
void
i386_pe_asm_file_end (file)
FILE *file;
{
struct extern_list *p;
ix86_asm_file_end (file);
for (p = extern_head; p != NULL; p = p->next)
{
tree decl;
decl = get_identifier (p->name);
/* Positively ensure only one declaration for any given symbol. */
if (! TREE_ASM_WRITTEN (decl) && TREE_SYMBOL_REFERENCED (decl))
{
TREE_ASM_WRITTEN (decl) = 1;
i386_pe_declare_function_type (file, p->name, TREE_PUBLIC (decl));
}
}
if (export_head)
{
struct export_list *q;
drectve_section ();
for (q = export_head; q != NULL; q = q->next)
{
fprintf (file, "\t.ascii \" -export:%s%s\"\n",
i386_pe_strip_name_encoding (q->name),
(q->is_data) ? ",data" : "");
}
}
}
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