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/* Routines for GCC for ARM/pe.
Copyright (C) 1995, 1996, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2010
Free Software Foundation, Inc.
Contributed by Doug Evans (dje@cygnus.com).
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 3, 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 COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "output.h"
#include "flags.h"
#include "tree.h"
#include "expr.h"
#include "diagnostic-core.h"
#include "tm_p.h"
extern int current_function_anonymous_args;
/* Return nonzero if DECL is a dllexport'd object. */
tree current_class_type; /* FIXME */
int
arm_dllexport_p (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;
return 0;
}
/* Return nonzero if DECL is a dllimport'd object. */
int
arm_dllimport_p (tree decl)
{
tree imp;
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));
if (imp)
return 1;
return 0;
}
/* Return nonzero if SYMBOL is marked as being dllexport'd. */
int
arm_dllexport_name_p (const char *symbol)
{
return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'e' && symbol[2] == '.';
}
/* Return nonzero if SYMBOL is marked as being dllimport'd. */
int
arm_dllimport_name_p (const char *symbol)
{
return symbol[0] == ARM_PE_FLAG_CHAR && symbol[1] == 'i' && symbol[2] == '.';
}
/* Mark a DECL as being dllexport'd.
Note that we override the previous setting (e.g.: dllimport). */
void
arm_mark_dllexport (tree decl)
{
const char * oldname;
char * newname;
rtx rtlname;
tree idp;
rtlname = XEXP (DECL_RTL (decl), 0);
if (GET_CODE (rtlname) == MEM)
rtlname = XEXP (rtlname, 0);
gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
oldname = XSTR (rtlname, 0);
if (arm_dllimport_name_p (oldname))
oldname += 9;
else if (arm_dllexport_name_p (oldname))
return; /* already done */
newname = XALLOCAVEC (char, strlen (oldname) + 4);
sprintf (newname, "%ce.%s", ARM_PE_FLAG_CHAR, 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. */
/* ??? At least I think that's why we do this. */
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
arm_mark_dllimport (tree decl)
{
const char * oldname;
char * newname;
tree idp;
rtx rtlname, newrtl;
rtlname = XEXP (DECL_RTL (decl), 0);
if (GET_CODE (rtlname) == MEM)
rtlname = XEXP (rtlname, 0);
gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
oldname = XSTR (rtlname, 0);
gcc_assert (!arm_dllexport_name_p (oldname));
if (arm_dllimport_name_p (oldname))
return; /* already done */
/* ??? One can well ask why we're making these checks here,
and that would be a good question. */
/* Imported variables can't be initialized. */
if (TREE_CODE (decl) == VAR_DECL
&& !DECL_VIRTUAL_P (decl)
&& DECL_INITIAL (decl))
{
error ("initialized variable %q+D is marked dllimport", decl);
return;
}
/* Nor can they be static. */
if (TREE_CODE (decl) == VAR_DECL
/* ??? Is this test for vtables needed? */
&& !DECL_VIRTUAL_P (decl)
&& 0 /*???*/)
{
error ("static variable %q+D is marked dllimport", decl);
return;
}
/* `extern' needn't be specified with dllimport.
Specify `extern' now and hope for the best. Sigh. */
if (TREE_CODE (decl) == VAR_DECL
/* ??? Is this test for vtables needed? */
&& !DECL_VIRTUAL_P (decl))
{
DECL_EXTERNAL (decl) = 1;
TREE_PUBLIC (decl) = 1;
}
newname = XALLOCAVEC (char, strlen (oldname) + 11);
sprintf (newname, "%ci.__imp_%s", ARM_PE_FLAG_CHAR, 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. */
/* ??? At least I think that's why we do this. */
idp = get_identifier (newname);
newrtl = gen_rtx_MEM (Pmode,
gen_rtx_SYMBOL_REF (Pmode,
IDENTIFIER_POINTER (idp)));
XEXP (DECL_RTL (decl), 0) = newrtl;
}
void
arm_pe_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
{
/* This bit is copied from arm_encode_section_info. */
if (optimize > 0 && TREE_CONSTANT (decl))
SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1;
/* Mark the decl so we can tell from the rtl whether the object is
dllexport'd or dllimport'd. */
if (arm_dllexport_p (decl))
arm_mark_dllexport (decl);
else if (arm_dllimport_p (decl))
arm_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 @i.__imp_foo. We need to remove that. */
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
&& arm_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));
XEXP (DECL_RTL (decl), 0) = newrtl;
/* We previously set TREE_PUBLIC and DECL_EXTERNAL.
??? We leave these alone for now. */
}
}
void
arm_pe_unique_section (tree decl, int reloc)
{
int len;
const char * name;
char * string;
const char * prefix;
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
name = arm_strip_name_encoding (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). */
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 = XALLOCAVEC (char, len + 1);
sprintf (string, "%s%s", prefix, name);
DECL_SECTION_NAME (decl) = build_string (len, string);
}
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