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/* Expand a SYMBOL into its corresponding dllimport, far-address,
or refptr symbol.
Copyright (C) 1988-2024 Free Software Foundation, Inc.
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 "backend.h"
#include "target.h"
#include "rtl.h"
#include "tree.h"
#include "memmodel.h"
#include "stringpool.h"
#include "emit-rtl.h"
#include "alias.h"
#include "varasm.h"
#include "output.h"
#include "explow.h"
#include "winnt.h"
/* Create or return the unique __imp_DECL dllimport symbol corresponding
to symbol DECL if BEIMPORT is true. Otherwise create or return the
unique refptr-DECL symbol corresponding to symbol DECL. */
struct dllimport_hasher : ggc_cache_ptr_hash<tree_map>
{
static inline hashval_t hash (tree_map *m)
{
return m->hash;
}
static inline bool
equal (tree_map *a, tree_map *b)
{
return a->base.from == b->base.from;
}
static int
keep_cache_entry (tree_map *&m)
{
return ggc_marked_p (m->base.from);
}
};
static GTY ((cache)) hash_table<dllimport_hasher> *dllimport_map;
/* Nonzero if the symbol is marked as dllimport, or as stub-variable,
otherwise zero. */
bool
is_imported_p (rtx x)
{
if (!TARGET_DLLIMPORT_DECL_ATTRIBUTES
|| GET_CODE (x) != SYMBOL_REF)
return false;
return SYMBOL_REF_DLLIMPORT_P (x) || SYMBOL_REF_STUBVAR_P (x);
}
/* Return a unique alias set for the GOT. */
alias_set_type
mingw_GOT_alias_set (void)
{
static alias_set_type set = -1;
if (set == -1)
set = new_alias_set ();
return set;
}
static tree
get_dllimport_decl (tree decl, bool beimport)
{
struct tree_map *h, in;
const char *name;
const char *prefix;
size_t namelen, prefixlen;
char *imp_name;
tree to;
rtx rtl;
if (!dllimport_map)
dllimport_map = hash_table<dllimport_hasher>::create_ggc (512);
in.hash = htab_hash_pointer (decl);
in.base.from = decl;
tree_map **loc = dllimport_map->find_slot_with_hash (&in, in.hash, INSERT);
h = *loc;
if (h)
return h->to;
*loc = h = ggc_alloc<tree_map> ();
h->hash = in.hash;
h->base.from = decl;
h->to = to = build_decl (DECL_SOURCE_LOCATION (decl),
VAR_DECL, NULL, ptr_type_node);
DECL_ARTIFICIAL (to) = 1;
DECL_IGNORED_P (to) = 1;
DECL_EXTERNAL (to) = 1;
TREE_READONLY (to) = 1;
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
name = targetm.strip_name_encoding (name);
if (beimport)
prefix = name[0] == FASTCALL_PREFIX || user_label_prefix[0] == 0
? "*__imp_" : "*__imp__";
else
prefix = user_label_prefix[0] == 0 ? "*.refptr." : "*refptr.";
namelen = strlen (name);
prefixlen = strlen (prefix);
imp_name = (char *) alloca (namelen + prefixlen + 1);
memcpy (imp_name, prefix, prefixlen);
memcpy (imp_name + prefixlen, name, namelen + 1);
name = ggc_alloc_string (imp_name, namelen + prefixlen);
rtl = gen_rtx_SYMBOL_REF (Pmode, name);
SET_SYMBOL_REF_DECL (rtl, to);
SYMBOL_REF_FLAGS (rtl) = SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_STUBVAR;
if (!beimport)
{
SYMBOL_REF_FLAGS (rtl) |= SYMBOL_FLAG_EXTERNAL;
#ifdef SUB_TARGET_RECORD_STUB
SUB_TARGET_RECORD_STUB (name);
#endif
}
rtl = gen_const_mem (Pmode, rtl);
set_mem_alias_set (rtl, mingw_GOT_alias_set ());
SET_DECL_RTL (to, rtl);
SET_DECL_ASSEMBLER_NAME (to, get_identifier (name));
return to;
}
/* Expand SYMBOL into its corresponding far-address symbol.
WANT_REG is true if we require the result be a register. */
static rtx
legitimize_pe_coff_extern_decl (rtx symbol, bool want_reg)
{
tree imp_decl;
rtx x;
gcc_assert (SYMBOL_REF_DECL (symbol));
imp_decl = get_dllimport_decl (SYMBOL_REF_DECL (symbol), false);
x = DECL_RTL (imp_decl);
if (want_reg)
x = force_reg (Pmode, x);
return x;
}
/* Expand SYMBOL into its corresponding dllimport symbol. WANT_REG is
true if we require the result be a register. */
static rtx
legitimize_dllimport_symbol (rtx symbol, bool want_reg)
{
tree imp_decl;
rtx x;
gcc_assert (SYMBOL_REF_DECL (symbol));
imp_decl = get_dllimport_decl (SYMBOL_REF_DECL (symbol), true);
x = DECL_RTL (imp_decl);
if (want_reg)
x = force_reg (Pmode, x);
return x;
}
/* Expand SYMBOL into its corresponding dllimport or refptr symbol. WANT_REG
is true if we require the result be a register. */
rtx
legitimize_pe_coff_symbol (rtx addr, bool inreg)
{
if (!TARGET_PECOFF)
return NULL_RTX;
if (TARGET_DLLIMPORT_DECL_ATTRIBUTES)
{
if (GET_CODE (addr) == SYMBOL_REF && SYMBOL_REF_DLLIMPORT_P (addr))
return legitimize_dllimport_symbol (addr, inreg);
if (GET_CODE (addr) == CONST
&& GET_CODE (XEXP (addr, 0)) == PLUS
&& GET_CODE (XEXP (XEXP (addr, 0), 0)) == SYMBOL_REF
&& SYMBOL_REF_DLLIMPORT_P (XEXP (XEXP (addr, 0), 0)))
{
rtx t = legitimize_dllimport_symbol (XEXP (XEXP (addr, 0), 0), inreg);
return gen_rtx_PLUS (Pmode, t, XEXP (XEXP (addr, 0), 1));
}
}
if (ix86_cmodel != CM_LARGE_PIC && ix86_cmodel != CM_MEDIUM_PIC)
return NULL_RTX;
if (GET_CODE (addr) == SYMBOL_REF
&& !is_imported_p (addr)
&& SYMBOL_REF_EXTERNAL_P (addr)
&& SYMBOL_REF_DECL (addr))
return legitimize_pe_coff_extern_decl (addr, inreg);
if (GET_CODE (addr) == CONST
&& GET_CODE (XEXP (addr, 0)) == PLUS
&& GET_CODE (XEXP (XEXP (addr, 0), 0)) == SYMBOL_REF
&& !is_imported_p (XEXP (XEXP (addr, 0), 0))
&& SYMBOL_REF_EXTERNAL_P (XEXP (XEXP (addr, 0), 0))
&& SYMBOL_REF_DECL (XEXP (XEXP (addr, 0), 0)))
{
rtx t = legitimize_pe_coff_extern_decl (XEXP (XEXP (addr, 0), 0), inreg);
return gen_rtx_PLUS (Pmode, t, XEXP (XEXP (addr, 0), 1));
}
return NULL_RTX;
}
#include "gt-winnt-dll.h"
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