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/* Routines for GCC for a Symbian OS targeted SH backend, shared by
both the C and C++ compilers.
Copyright (C) 2004, 2005, 2007, 2009, 2010 Free Software Foundation, Inc.
Contributed by RedHat.
Most of this code is stolen from i386/winnt.c.
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 "tm_p.h"
#include "diagnostic-core.h"
#include "sh-symbian.h"
/* Return nonzero if SYMBOL is marked as being dllexport'd. */
bool
sh_symbian_is_dllexported_name (const char *symbol)
{
return strncmp (DLL_EXPORT_PREFIX, symbol,
strlen (DLL_EXPORT_PREFIX)) == 0;
}
/* Return nonzero if SYMBOL is marked as being dllimport'd. */
static bool
sh_symbian_is_dllimported_name (const char *symbol)
{
return strncmp (DLL_IMPORT_PREFIX, symbol,
strlen (DLL_IMPORT_PREFIX)) == 0;
}
/* Return nonzero if DECL is a dllexport'd object. */
bool
sh_symbian_is_dllexported (tree decl)
{
tree exp;
if ( TREE_CODE (decl) != VAR_DECL
&& TREE_CODE (decl) != FUNCTION_DECL)
return false;
exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
/* Class members get the dllexport status of their class. */
if (exp == NULL)
{
tree class = sh_symbian_associated_type (decl);
if (class)
exp = lookup_attribute ("dllexport", TYPE_ATTRIBUTES (class));
}
#if SYMBIAN_DEBUG
if (exp)
{
print_node_brief (stderr, "dllexport:", decl, 0);
fprintf (stderr, "\n");
}
else
#if SYMBIAN_DEBUG < 2
if (TREE_CODE (decl) != FUNCTION_DECL)
#endif
{
print_node_brief (stderr, "no dllexport:", decl, 0);
fprintf (stderr, "\n");
}
#endif
return exp ? true : false;
}
/* Mark a DECL as being dllimport'd. */
static void
sh_symbian_mark_dllimport (tree decl)
{
const char *oldname;
char *newname;
tree idp;
rtx rtlname;
rtx newrtl;
rtlname = XEXP (DECL_RTL (decl), 0);
if (MEM_P (rtlname))
rtlname = XEXP (rtlname, 0);
gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
oldname = XSTR (rtlname, 0);
if (sh_symbian_is_dllexported_name (oldname))
{
error ("%qE declared as both exported to and imported from a DLL",
DECL_NAME (decl));
}
else if (sh_symbian_is_dllimported_name (oldname))
{
/* Already done, but do a sanity check to prevent assembler errors. */
if (!DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
error ("failure in redeclaration of %q+D: dllimport%'d symbol lacks external linkage",
decl);
}
else
{
newname = (char *) alloca (strlen (DLL_IMPORT_PREFIX) + strlen (oldname) + 1);
sprintf (newname, "%s%s", DLL_IMPORT_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_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (idp));
XEXP (DECL_RTL (decl), 0) = newrtl;
}
}
/* Mark a DECL as being dllexport'd.
Note that we override the previous setting (e.g.: dllimport). */
static void
sh_symbian_mark_dllexport (tree decl)
{
const char *oldname;
char *newname;
rtx rtlname;
tree idp;
rtlname = XEXP (DECL_RTL (decl), 0);
if (MEM_P (rtlname))
rtlname = XEXP (rtlname, 0);
gcc_assert (GET_CODE (rtlname) == SYMBOL_REF);
oldname = XSTR (rtlname, 0);
if (sh_symbian_is_dllimported_name (oldname))
{
/* Remove DLL_IMPORT_PREFIX.
Note - we do not issue a warning here. In Symbian's environment it
is legitimate for a prototype to be marked as dllimport and the
corresponding definition to be marked as dllexport. The prototypes
are in headers used everywhere and the definition is in a translation
unit which has included the header in order to ensure argument
correctness. */
oldname += strlen (DLL_IMPORT_PREFIX);
DECL_DLLIMPORT_P (decl) = 0;
}
else if (sh_symbian_is_dllexported_name (oldname))
return; /* Already done. */
newname = (char *) alloca (strlen (DLL_EXPORT_PREFIX) + strlen (oldname) + 1);
sprintf (newname, "%s%s", DLL_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));
}
void
sh_symbian_encode_section_info (tree decl, rtx rtl, int first)
{
default_encode_section_info (decl, rtl, first);
/* Mark the decl so we can tell from the rtl whether
the object is dllexport'd or dllimport'd. */
if (sh_symbian_is_dllexported (decl))
sh_symbian_mark_dllexport (decl);
else if (sh_symbian_is_dllimported (decl))
sh_symbian_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_PREFIX) prefixed. We need to remove
that. Ditto for the DECL_DLLIMPORT_P flag. */
else if ( (TREE_CODE (decl) == FUNCTION_DECL
|| TREE_CODE (decl) == VAR_DECL)
&& DECL_RTL (decl) != NULL_RTX
&& MEM_P (DECL_RTL (decl))
&& MEM_P (XEXP (DECL_RTL (decl), 0))
&& GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
&& sh_symbian_is_dllimported_name (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
{
const char * oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
/* Remove DLL_IMPORT_PREFIX. */
tree idp = get_identifier (oldname + strlen (DLL_IMPORT_PREFIX));
rtx newrtl = gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (idp));
warning (0, "%s %q+D %s after being referenced with dllimport linkage",
TREE_CODE (decl) == VAR_DECL ? "variable" : "function",
decl, (DECL_INITIAL (decl) || !DECL_EXTERNAL (decl))
? "defined locally" : "redeclared without dllimport attribute");
XEXP (DECL_RTL (decl), 0) = newrtl;
DECL_DLLIMPORT_P (decl) = 0;
}
}
/* Return the length of a function name prefix
that starts with the character 'c'. */
static int
sh_symbian_get_strip_length (int c)
{
/* XXX Assumes strlen (DLL_EXPORT_PREFIX) == strlen (DLL_IMPORT_PREFIX). */
return (c == SH_SYMBIAN_FLAG_CHAR[0]) ? strlen (DLL_EXPORT_PREFIX) : 0;
}
/* Return a pointer to a function's name with any
and all prefix encodings stripped from it. */
const char *
sh_symbian_strip_name_encoding (const char *name)
{
int skip;
while ((skip = sh_symbian_get_strip_length (*name)))
name += skip;
return name;
}
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