678 lines
19 KiB
C
678 lines
19 KiB
C
/* Subroutines for insn-output.c for Windows NT.
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Contributed by Douglas Rupp (drupp@cs.washington.edu)
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Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "rtl.h"
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#include "regs.h"
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#include "hard-reg-set.h"
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#include "output.h"
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#include "tree.h"
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#include "flags.h"
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#include "tm_p.h"
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#include "toplev.h"
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#include "hashtab.h"
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/* i386/PE specific attribute support.
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i386/PE has two new attributes:
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dllexport - for exporting a function/variable that will live in a dll
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dllimport - for importing a function/variable from a dll
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Microsoft allows multiple declspecs in one __declspec, separating
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them with spaces. We do NOT support this. Instead, use __declspec
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multiple times.
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*/
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static tree associated_type PARAMS ((tree));
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const char * gen_stdcall_suffix PARAMS ((tree));
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int i386_pe_dllexport_p PARAMS ((tree));
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int i386_pe_dllimport_p PARAMS ((tree));
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void i386_pe_mark_dllexport PARAMS ((tree));
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void i386_pe_mark_dllimport PARAMS ((tree));
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/* Handle a "dllimport" or "dllexport" attribute;
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arguments as in struct attribute_spec.handler. */
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tree
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ix86_handle_dll_attribute (node, name, args, flags, no_add_attrs)
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tree *node;
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tree name;
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tree args;
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int flags;
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bool *no_add_attrs;
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{
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/* These attributes may apply to structure and union types being created,
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but otherwise should pass to the declaration involved. */
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if (!DECL_P (*node))
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{
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if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
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| (int) ATTR_FLAG_ARRAY_NEXT))
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{
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*no_add_attrs = true;
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return tree_cons (name, args, NULL_TREE);
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}
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if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE)
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{
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warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
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*no_add_attrs = true;
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}
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}
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return NULL_TREE;
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}
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/* Handle a "shared" attribute;
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arguments as in struct attribute_spec.handler. */
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tree
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ix86_handle_shared_attribute (node, name, args, flags, no_add_attrs)
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tree *node;
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tree name;
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tree args ATTRIBUTE_UNUSED;
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int flags ATTRIBUTE_UNUSED;
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bool *no_add_attrs;
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{
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if (TREE_CODE (*node) != VAR_DECL)
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{
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warning ("`%s' attribute only applies to variables",
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IDENTIFIER_POINTER (name));
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*no_add_attrs = true;
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}
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return NULL_TREE;
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}
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/* Return the type that we should use to determine if DECL is
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imported or exported. */
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static tree
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associated_type (decl)
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tree decl;
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{
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tree t = NULL_TREE;
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/* In the C++ frontend, DECL_CONTEXT for a method doesn't actually refer
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to the containing class. So we look at the 'this' arg. */
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if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
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{
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/* Artificial methods are not affected by the import/export status of
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their class unless they are virtual. */
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if (! DECL_ARTIFICIAL (decl) || DECL_VINDEX (decl))
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t = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl))));
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}
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else if (DECL_CONTEXT (decl)
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&& TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (decl))) == 't')
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t = DECL_CONTEXT (decl);
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return t;
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}
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/* Return non-zero if DECL is a dllexport'd object. */
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int
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i386_pe_dllexport_p (decl)
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tree decl;
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{
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tree exp;
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if (TREE_CODE (decl) != VAR_DECL
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&& TREE_CODE (decl) != FUNCTION_DECL)
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return 0;
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exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
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if (exp)
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return 1;
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/* Class members get the dllexport status of their class. */
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if (associated_type (decl))
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{
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exp = lookup_attribute ("dllexport",
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TYPE_ATTRIBUTES (associated_type (decl)));
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if (exp)
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return 1;
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}
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return 0;
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}
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/* Return non-zero if DECL is a dllimport'd object. */
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int
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i386_pe_dllimport_p (decl)
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tree decl;
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{
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tree imp;
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if (TREE_CODE (decl) == FUNCTION_DECL
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&& TARGET_NOP_FUN_DLLIMPORT)
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return 0;
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if (TREE_CODE (decl) != VAR_DECL
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&& TREE_CODE (decl) != FUNCTION_DECL)
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return 0;
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imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl));
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if (imp)
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return 1;
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/* Class members get the dllimport status of their class. */
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if (associated_type (decl))
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{
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imp = lookup_attribute ("dllimport",
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TYPE_ATTRIBUTES (associated_type (decl)));
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if (imp)
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return 1;
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}
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return 0;
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}
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/* Return non-zero if SYMBOL is marked as being dllexport'd. */
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int
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i386_pe_dllexport_name_p (symbol)
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const char *symbol;
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{
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return symbol[0] == '@' && symbol[1] == 'e' && symbol[2] == '.';
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}
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/* Return non-zero if SYMBOL is marked as being dllimport'd. */
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int
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i386_pe_dllimport_name_p (symbol)
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const char *symbol;
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{
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return symbol[0] == '@' && symbol[1] == 'i' && symbol[2] == '.';
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}
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/* Mark a DECL as being dllexport'd.
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Note that we override the previous setting (eg: dllimport). */
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void
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i386_pe_mark_dllexport (decl)
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tree decl;
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{
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const char *oldname;
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char *newname;
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rtx rtlname;
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tree idp;
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rtlname = XEXP (DECL_RTL (decl), 0);
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if (GET_CODE (rtlname) == SYMBOL_REF)
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oldname = XSTR (rtlname, 0);
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else if (GET_CODE (rtlname) == MEM
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&& GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
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oldname = XSTR (XEXP (rtlname, 0), 0);
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else
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abort ();
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if (i386_pe_dllimport_name_p (oldname))
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oldname += 9;
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else if (i386_pe_dllexport_name_p (oldname))
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return; /* already done */
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newname = alloca (strlen (oldname) + 4);
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sprintf (newname, "@e.%s", oldname);
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/* We pass newname through get_identifier to ensure it has a unique
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address. RTL processing can sometimes peek inside the symbol ref
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and compare the string's addresses to see if two symbols are
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identical. */
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idp = get_identifier (newname);
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XEXP (DECL_RTL (decl), 0) =
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gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
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}
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/* Mark a DECL as being dllimport'd. */
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void
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i386_pe_mark_dllimport (decl)
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tree decl;
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{
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const char *oldname;
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char *newname;
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tree idp;
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rtx rtlname, newrtl;
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rtlname = XEXP (DECL_RTL (decl), 0);
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if (GET_CODE (rtlname) == SYMBOL_REF)
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oldname = XSTR (rtlname, 0);
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else if (GET_CODE (rtlname) == MEM
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&& GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
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oldname = XSTR (XEXP (rtlname, 0), 0);
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else
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abort ();
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if (i386_pe_dllexport_name_p (oldname))
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{
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error ("`%s' declared as both exported to and imported from a DLL",
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IDENTIFIER_POINTER (DECL_NAME (decl)));
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return;
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}
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else if (i386_pe_dllimport_name_p (oldname))
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{
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/* Already done, but force correct linkage since the redeclaration
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might have omitted explicit extern. Sigh. */
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if (TREE_CODE (decl) == VAR_DECL
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/* ??? Is this test for vtables needed? */
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&& !DECL_VIRTUAL_P (decl))
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{
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DECL_EXTERNAL (decl) = 1;
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TREE_PUBLIC (decl) = 1;
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}
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return;
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}
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/* ??? One can well ask why we're making these checks here,
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and that would be a good question. */
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/* Imported variables can't be initialized. Note that C++ classes
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are marked initial, so we need to check. */
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if (TREE_CODE (decl) == VAR_DECL
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&& !DECL_VIRTUAL_P (decl)
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&& (DECL_INITIAL (decl)
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&& ! TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))))
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{
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error_with_decl (decl, "initialized variable `%s' is marked dllimport");
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return;
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}
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/* Nor can they be static. */
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if (TREE_CODE (decl) == VAR_DECL
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/* ??? Is this test for vtables needed? */
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&& !DECL_VIRTUAL_P (decl)
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&& 0 /*???*/)
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{
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error_with_decl (decl, "static variable `%s' is marked dllimport");
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return;
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}
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/* `extern' needn't be specified with dllimport.
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Specify `extern' now and hope for the best. Sigh. */
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if (TREE_CODE (decl) == VAR_DECL
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/* ??? Is this test for vtables needed? */
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&& !DECL_VIRTUAL_P (decl))
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{
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DECL_EXTERNAL (decl) = 1;
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TREE_PUBLIC (decl) = 1;
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}
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newname = alloca (strlen (oldname) + 11);
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sprintf (newname, "@i._imp__%s", oldname);
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/* We pass newname through get_identifier to ensure it has a unique
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address. RTL processing can sometimes peek inside the symbol ref
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and compare the string's addresses to see if two symbols are
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identical. */
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idp = get_identifier (newname);
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newrtl = gen_rtx (MEM, Pmode,
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gen_rtx (SYMBOL_REF, Pmode,
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IDENTIFIER_POINTER (idp)));
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XEXP (DECL_RTL (decl), 0) = newrtl;
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/* Can't treat a pointer to this as a constant address */
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DECL_NON_ADDR_CONST_P (decl) = 1;
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}
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/* Return string which is the former assembler name modified with a
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suffix consisting of an atsign (@) followed by the number of bytes of
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arguments */
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const char *
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gen_stdcall_suffix (decl)
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tree decl;
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{
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int total = 0;
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/* ??? This probably should use XSTR (XEXP (DECL_RTL (decl), 0), 0) instead
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of DECL_ASSEMBLER_NAME. */
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const char *asmname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
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char *newsym;
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if (TYPE_ARG_TYPES (TREE_TYPE (decl)))
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if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (decl))))
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== void_type_node)
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{
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tree formal_type = TYPE_ARG_TYPES (TREE_TYPE (decl));
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while (TREE_VALUE (formal_type) != void_type_node)
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{
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int parm_size
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= TREE_INT_CST_LOW (TYPE_SIZE (TREE_VALUE (formal_type)));
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/* Must round up to include padding. This is done the same
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way as in store_one_arg. */
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parm_size = ((parm_size + PARM_BOUNDARY - 1)
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/ PARM_BOUNDARY * PARM_BOUNDARY);
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total += parm_size;
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formal_type = TREE_CHAIN (formal_type);
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}
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}
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newsym = xmalloc (strlen (asmname) + 10);
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sprintf (newsym, "%s@%d", asmname, total/BITS_PER_UNIT);
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return IDENTIFIER_POINTER (get_identifier (newsym));
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}
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/* Cover function to implement ENCODE_SECTION_INFO. */
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void
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i386_pe_encode_section_info (decl)
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tree decl;
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{
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/* This bit is copied from i386.h. */
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if (optimize > 0 && TREE_CONSTANT (decl)
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&& (!flag_writable_strings || TREE_CODE (decl) != STRING_CST))
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{
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rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd'
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? TREE_CST_RTL (decl) : DECL_RTL (decl));
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SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1;
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}
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if (TREE_CODE (decl) == FUNCTION_DECL)
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if (lookup_attribute ("stdcall",
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TYPE_ATTRIBUTES (TREE_TYPE (decl))))
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XEXP (DECL_RTL (decl), 0) =
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gen_rtx (SYMBOL_REF, Pmode, gen_stdcall_suffix (decl));
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/* Mark the decl so we can tell from the rtl whether the object is
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dllexport'd or dllimport'd. */
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if (i386_pe_dllexport_p (decl))
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i386_pe_mark_dllexport (decl);
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else if (i386_pe_dllimport_p (decl))
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i386_pe_mark_dllimport (decl);
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/* It might be that DECL has already been marked as dllimport, but a
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subsequent definition nullified that. The attribute is gone but
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DECL_RTL still has @i._imp__foo. We need to remove that. Ditto
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for the DECL_NON_ADDR_CONST_P flag. */
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else if ((TREE_CODE (decl) == FUNCTION_DECL
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|| TREE_CODE (decl) == VAR_DECL)
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&& DECL_RTL (decl) != NULL_RTX
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&& GET_CODE (DECL_RTL (decl)) == MEM
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&& GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
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&& GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
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&& i386_pe_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
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{
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const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
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tree idp = get_identifier (oldname + 9);
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rtx newrtl = gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
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XEXP (DECL_RTL (decl), 0) = newrtl;
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DECL_NON_ADDR_CONST_P (decl) = 0;
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/* We previously set TREE_PUBLIC and DECL_EXTERNAL.
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We leave these alone for now. */
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}
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}
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/* Cover function for UNIQUE_SECTION. */
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void
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i386_pe_unique_section (decl, reloc)
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tree decl;
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int reloc;
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{
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int len;
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const char *name, *prefix;
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char *string;
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name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
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/* Strip off any encoding in fnname. */
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STRIP_NAME_ENCODING (name, name);
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/* The object is put in, for example, section .text$foo.
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The linker will then ultimately place them in .text
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(everything from the $ on is stripped). Don't put
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read-only data in .rdata section to avoid a PE linker
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bug when .rdata$* grouped sections are used in code
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without a .rdata section. */
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if (TREE_CODE (decl) == FUNCTION_DECL)
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prefix = ".text$";
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/* else if (DECL_INITIAL (decl) == 0
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|| DECL_INITIAL (decl) == error_mark_node)
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prefix = ".bss"; */
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else if (DECL_READONLY_SECTION (decl, reloc))
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#ifdef READONLY_DATA_SECTION
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prefix = ".rdata$";
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#else
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prefix = ".text$";
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#endif
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else
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prefix = ".data$";
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len = strlen (name) + strlen (prefix);
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string = alloca (len + 1);
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sprintf (string, "%s%s", prefix, name);
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DECL_SECTION_NAME (decl) = build_string (len, string);
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}
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/* Select a set of attributes for section NAME based on the properties
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of DECL and whether or not RELOC indicates that DECL's initializer
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might contain runtime relocations.
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We make the section read-only and executable for a function decl,
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read-only for a const data decl, and writable for a non-const data decl.
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If the section has already been defined, to not allow it to have
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different attributes, as (1) this is ambiguous since we're not seeing
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all the declarations up front and (2) some assemblers (e.g. SVR4)
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do not recoginize section redefinitions. */
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/* ??? This differs from the "standard" PE implementation in that we
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handle the SHARED variable attribute. Should this be done for all
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PE targets? */
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#define SECTION_PE_SHARED SECTION_MACH_DEP
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unsigned int
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i386_pe_section_type_flags (decl, name, reloc)
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tree decl;
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const char *name;
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int reloc;
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{
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static htab_t htab;
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unsigned int flags;
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unsigned int **slot;
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/* The names we put in the hashtable will always be the unique
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versions gived to us by the stringtable, so we can just use
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their addresses as the keys. */
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if (!htab)
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htab = htab_create (31, htab_hash_pointer, htab_eq_pointer, NULL);
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if (decl && TREE_CODE (decl) == FUNCTION_DECL)
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flags = SECTION_CODE;
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else if (decl && DECL_READONLY_SECTION (decl, reloc))
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flags = 0;
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else
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{
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flags = SECTION_WRITE;
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|
||
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 non-zero 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 *) permalloc (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 *) permalloc (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_ENCODING (q->name),
|
||
(q->is_data) ? ",data" : "");
|
||
}
|
||
}
|
||
}
|
||
|