1 /* Subroutines for insn-output.c for Windows NT.
2 Contributed by Douglas Rupp (drupp@cs.washington.edu)
3 Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
28 #include "hard-reg-set.h"
33 #include "diagnostic-core.h"
36 #include "langhooks.h"
40 #include "lto-streamer.h"
42 /* i386/PE specific attribute support.
44 i386/PE has two new attributes:
45 dllexport - for exporting a function/variable that will live in a dll
46 dllimport - for importing a function/variable from a dll
48 Microsoft allows multiple declspecs in one __declspec, separating
49 them with spaces. We do NOT support this. Instead, use __declspec
53 /* Handle a "shared" attribute;
54 arguments as in struct attribute_spec.handler. */
56 ix86_handle_shared_attribute (tree *node, tree name,
57 tree args ATTRIBUTE_UNUSED,
58 int flags ATTRIBUTE_UNUSED, bool *no_add_attrs)
60 if (TREE_CODE (*node) != VAR_DECL)
62 warning (OPT_Wattributes, "%qE attribute only applies to variables",
70 /* Handle a "selectany" attribute;
71 arguments as in struct attribute_spec.handler. */
73 ix86_handle_selectany_attribute (tree *node, tree name,
74 tree args ATTRIBUTE_UNUSED,
75 int flags ATTRIBUTE_UNUSED,
78 /* The attribute applies only to objects that are initialized and have
79 external linkage. However, we may not know about initialization
80 until the language frontend has processed the decl. We'll check for
81 initialization later in encode_section_info. */
82 if (TREE_CODE (*node) != VAR_DECL || !TREE_PUBLIC (*node))
84 error ("%qE attribute applies only to initialized variables"
85 " with external linkage", name);
93 /* Return the type that we should use to determine if DECL is
94 imported or exported. */
97 associated_type (tree decl)
99 return (DECL_CONTEXT (decl) && TYPE_P (DECL_CONTEXT (decl))
100 ? DECL_CONTEXT (decl) : NULL_TREE);
103 /* Return true if DECL should be a dllexport'd object. */
106 i386_pe_determine_dllexport_p (tree decl)
108 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
111 /* Don't export local clones of dllexports. */
112 if (!TREE_PUBLIC (decl))
115 if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
121 /* Return true if DECL should be a dllimport'd object. */
124 i386_pe_determine_dllimport_p (tree decl)
128 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
131 if (DECL_DLLIMPORT_P (decl))
134 /* The DECL_DLLIMPORT_P flag was set for decls in the class definition
135 by targetm.cxx.adjust_class_at_definition. Check again to emit
136 error message if the class attribute has been overridden by an
137 out-of-class definition of static data. */
138 assoc = associated_type (decl);
139 if (assoc && lookup_attribute ("dllimport", TYPE_ATTRIBUTES (assoc))
140 && TREE_CODE (decl) == VAR_DECL
141 && TREE_STATIC (decl) && TREE_PUBLIC (decl)
142 && !DECL_EXTERNAL (decl)
143 /* vtable's are linkonce constants, so defining a vtable is not
144 an error as long as we don't try to import it too. */
145 && !DECL_VIRTUAL_P (decl))
146 error ("definition of static data member %q+D of "
147 "dllimport'd class", decl);
152 /* Handle the -mno-fun-dllimport target switch. */
155 i386_pe_valid_dllimport_attribute_p (const_tree decl)
157 if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL)
162 /* Return string which is the function name, identified by ID, modified
163 with a suffix consisting of an atsign (@) followed by the number of
164 bytes of arguments. If ID is NULL use the DECL_NAME as base. If
165 FASTCALL is true, also add the FASTCALL_PREFIX.
166 Return NULL if no change required. */
169 gen_stdcall_or_fastcall_suffix (tree decl, tree id, bool fastcall)
171 HOST_WIDE_INT total = 0;
172 const char *old_str = IDENTIFIER_POINTER (id != NULL_TREE ? id : DECL_NAME (decl));
174 tree type = TREE_TYPE (decl);
176 function_args_iterator args_iter;
178 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
180 if (prototype_p (type))
182 /* This attribute is ignored for variadic functions. */
186 /* Quit if we hit an incomplete type. Error is reported
187 by convert_arguments in c-typeck.c or cp/typeck.c. */
188 FOREACH_FUNCTION_ARGS(type, arg, args_iter)
190 HOST_WIDE_INT parm_size;
191 HOST_WIDE_INT parm_boundary_bytes = PARM_BOUNDARY / BITS_PER_UNIT;
193 if (! COMPLETE_TYPE_P (arg))
196 parm_size = int_size_in_bytes (arg);
200 /* Must round up to include padding. This is done the same
201 way as in store_one_arg. */
202 parm_size = ((parm_size + parm_boundary_bytes - 1)
203 / parm_boundary_bytes * parm_boundary_bytes);
207 /* Assume max of 8 base 10 digits in the suffix. */
208 p = new_str = XALLOCAVEC (char, 1 + strlen (old_str) + 1 + 8 + 1);
210 *p++ = FASTCALL_PREFIX;
211 sprintf (p, "%s@" HOST_WIDE_INT_PRINT_DEC, old_str, total);
213 return get_identifier (new_str);
216 /* Maybe decorate and get a new identifier for the DECL of a stdcall or
217 fastcall function. The original identifier is supplied in ID. */
220 i386_pe_maybe_mangle_decl_assembler_name (tree decl, tree id)
222 tree new_id = NULL_TREE;
224 if (TREE_CODE (decl) == FUNCTION_DECL)
226 tree type_attributes = TYPE_ATTRIBUTES (TREE_TYPE (decl));
227 if (lookup_attribute ("stdcall", type_attributes))
228 new_id = gen_stdcall_or_fastcall_suffix (decl, id, false);
229 else if (lookup_attribute ("fastcall", type_attributes))
230 new_id = gen_stdcall_or_fastcall_suffix (decl, id, true);
236 /* This is used as a target hook to modify the DECL_ASSEMBLER_NAME
237 in the language-independent default hook
238 langhooks,c:lhd_set_decl_assembler_name ()
239 and in cp/mangle,c:mangle_decl (). */
241 i386_pe_mangle_decl_assembler_name (tree decl, tree id)
243 tree new_id = i386_pe_maybe_mangle_decl_assembler_name (decl, id);
245 return (new_id ? new_id : id);
249 i386_pe_encode_section_info (tree decl, rtx rtl, int first)
254 /* Do this last, due to our frobbing of DECL_DLLIMPORT_P above. */
255 default_encode_section_info (decl, rtl, first);
257 /* Careful not to prod global register variables. */
261 symbol = XEXP (rtl, 0);
262 gcc_assert (GET_CODE (symbol) == SYMBOL_REF);
264 switch (TREE_CODE (decl))
267 /* FIXME: Imported stdcall names are not modified by the Ada frontend.
268 Check and decorate the RTL name now. */
269 if (strcmp (lang_hooks.name, "GNU Ada") == 0)
272 tree old_id = DECL_ASSEMBLER_NAME (decl);
273 const char* asm_str = IDENTIFIER_POINTER (old_id);
274 /* Do not change the identifier if a verbatim asmspec
275 or if stdcall suffix already added. */
276 if (!(*asm_str == '*' || strchr (asm_str, '@'))
277 && (new_id = i386_pe_maybe_mangle_decl_assembler_name (decl,
279 XSTR (symbol, 0) = IDENTIFIER_POINTER (new_id);
284 if (lookup_attribute ("selectany", DECL_ATTRIBUTES (decl)))
286 if (DECL_INITIAL (decl)
287 /* If an object is initialized with a ctor, the static
288 initialization and destruction code for it is present in
289 each unit defining the object. The code that calls the
290 ctor is protected by a link-once guard variable, so that
291 the object still has link-once semantics, */
292 || TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
293 make_decl_one_only (decl, DECL_ASSEMBLER_NAME (decl));
295 error ("%q+D:'selectany' attribute applies only to "
296 "initialized objects", decl);
304 /* Mark the decl so we can tell from the rtl whether the object is
305 dllexport'd or dllimport'd. tree.c: merge_dllimport_decl_attributes
306 handles dllexport/dllimport override semantics. */
307 flags = (SYMBOL_REF_FLAGS (symbol) &
308 ~(SYMBOL_FLAG_DLLIMPORT | SYMBOL_FLAG_DLLEXPORT));
309 if (i386_pe_determine_dllexport_p (decl))
310 flags |= SYMBOL_FLAG_DLLEXPORT;
311 else if (i386_pe_determine_dllimport_p (decl))
312 flags |= SYMBOL_FLAG_DLLIMPORT;
314 SYMBOL_REF_FLAGS (symbol) = flags;
318 i386_pe_binds_local_p (const_tree exp)
320 /* PE does not do dynamic binding. Indeed, the only kind of
321 non-local reference comes from a dllimport'd symbol. */
322 if ((TREE_CODE (exp) == VAR_DECL || TREE_CODE (exp) == FUNCTION_DECL)
323 && DECL_DLLIMPORT_P (exp))
326 /* Or a weak one, now that they are supported. */
327 if ((TREE_CODE (exp) == VAR_DECL || TREE_CODE (exp) == FUNCTION_DECL)
334 /* Also strip the fastcall prefix and stdcall suffix. */
337 i386_pe_strip_name_encoding_full (const char *str)
340 const char *name = default_strip_name_encoding (str);
342 /* Strip leading '@' on fastcall symbols. */
346 /* Strip trailing "@n". */
347 p = strchr (name, '@');
349 return ggc_alloc_string (name, p - name);
355 i386_pe_unique_section (tree decl, int reloc)
358 const char *name, *prefix;
361 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
362 name = i386_pe_strip_name_encoding_full (name);
364 /* The object is put in, for example, section .text$foo.
365 The linker will then ultimately place them in .text
366 (everything from the $ on is stripped). Don't put
367 read-only data in .rdata section to avoid a PE linker
368 bug when .rdata$* grouped sections are used in code
369 without a .rdata section. */
370 if (TREE_CODE (decl) == FUNCTION_DECL)
372 else if (decl_readonly_section (decl, reloc))
376 len = strlen (name) + strlen (prefix);
377 string = XALLOCAVEC (char, len + 1);
378 sprintf (string, "%s%s", prefix, name);
380 DECL_SECTION_NAME (decl) = build_string (len, string);
383 /* Select a set of attributes for section NAME based on the properties
384 of DECL and whether or not RELOC indicates that DECL's initializer
385 might contain runtime relocations.
387 We make the section read-only and executable for a function decl,
388 read-only for a const data decl, and writable for a non-const data decl.
390 If the section has already been defined, to not allow it to have
391 different attributes, as (1) this is ambiguous since we're not seeing
392 all the declarations up front and (2) some assemblers (e.g. SVR4)
393 do not recognize section redefinitions. */
394 /* ??? This differs from the "standard" PE implementation in that we
395 handle the SHARED variable attribute. Should this be done for all
398 #define SECTION_PE_SHARED SECTION_MACH_DEP
401 i386_pe_section_type_flags (tree decl, const char *name, int reloc)
407 /* The names we put in the hashtable will always be the unique
408 versions given to us by the stringtable, so we can just use
409 their addresses as the keys. */
411 htab = htab_create (31, htab_hash_pointer, htab_eq_pointer, NULL);
413 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
414 flags = SECTION_CODE;
415 else if (decl && decl_readonly_section (decl, reloc))
417 else if (current_function_decl
419 && crtl->subsections.unlikely_text_section_name
420 && strcmp (name, crtl->subsections.unlikely_text_section_name) == 0)
421 flags = SECTION_CODE;
423 && (!current_function_decl || !cfun)
424 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
425 flags = SECTION_CODE;
428 flags = SECTION_WRITE;
430 if (decl && TREE_CODE (decl) == VAR_DECL
431 && lookup_attribute ("shared", DECL_ATTRIBUTES (decl)))
432 flags |= SECTION_PE_SHARED;
435 if (decl && DECL_ONE_ONLY (decl))
436 flags |= SECTION_LINKONCE;
438 /* See if we already have an entry for this section. */
439 slot = (unsigned int **) htab_find_slot (htab, name, INSERT);
442 *slot = (unsigned int *) xmalloc (sizeof (unsigned int));
447 if (decl && **slot != flags)
448 error ("%q+D causes a section type conflict", decl);
455 i386_pe_asm_named_section (const char *name, unsigned int flags,
458 char flagchars[8], *f = flagchars;
460 if ((flags & (SECTION_CODE | SECTION_WRITE)) == 0)
463 *f++ ='d'; /* This is necessary for older versions of gas. */
468 if (flags & SECTION_CODE)
470 if (flags & SECTION_WRITE)
472 if (flags & SECTION_PE_SHARED)
476 /* LTO sections need 1-byte alignment to avoid confusing the
477 zlib decompression algorithm with trailing zero pad bytes. */
478 if (strncmp (name, LTO_SECTION_NAME_PREFIX,
479 strlen (LTO_SECTION_NAME_PREFIX)) == 0)
484 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
486 if (flags & SECTION_LINKONCE)
488 /* Functions may have been compiled at various levels of
489 optimization so we can't use `same_size' here.
490 Instead, have the linker pick one, without warning.
491 If 'selectany' attribute has been specified, MS compiler
492 sets 'discard' characteristic, rather than telling linker
493 to warn of size or content mismatch, so do the same. */
494 bool discard = (flags & SECTION_CODE)
495 || lookup_attribute ("selectany",
496 DECL_ATTRIBUTES (decl));
497 fprintf (asm_out_file, "\t.linkonce %s\n",
498 (discard ? "discard" : "same_size"));
502 /* Beware, DECL may be NULL if compile_file() is emitting the LTO marker. */
505 i386_pe_asm_output_aligned_decl_common (FILE *stream, tree decl,
506 const char *name, HOST_WIDE_INT size,
507 HOST_WIDE_INT align ATTRIBUTE_UNUSED)
509 HOST_WIDE_INT rounded;
511 /* Compute as in assemble_noswitch_variable, since we don't have
512 support for aligned common on older binutils. We must also
513 avoid emitting a common symbol of size zero, as this is the
514 overloaded representation that indicates an undefined external
515 symbol in the PE object file format. */
516 rounded = size ? size : 1;
517 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
518 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
519 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
521 i386_pe_maybe_record_exported_symbol (decl, name, 1);
523 fprintf (stream, "\t.comm\t");
524 assemble_name (stream, name);
525 if (use_pe_aligned_common)
526 fprintf (stream, ", " HOST_WIDE_INT_PRINT_DEC ", %d\n",
527 size ? size : (HOST_WIDE_INT) 1,
528 exact_log2 (align) - exact_log2 (CHAR_BIT));
530 fprintf (stream, ", " HOST_WIDE_INT_PRINT_DEC "\t" ASM_COMMENT_START
531 " " HOST_WIDE_INT_PRINT_DEC "\n", rounded, size);
534 /* The Microsoft linker requires that every function be marked as
535 DT_FCN. When using gas on cygwin, we must emit appropriate .type
540 /* Mark a function appropriately. This should only be called for
541 functions for which we are not emitting COFF debugging information.
542 FILE is the assembler output file, NAME is the name of the
543 function, and PUB is nonzero if the function is globally
547 i386_pe_declare_function_type (FILE *file, const char *name, int pub)
549 fprintf (file, "\t.def\t");
550 assemble_name (file, name);
551 fprintf (file, ";\t.scl\t%d;\t.type\t%d;\t.endef\n",
552 pub ? (int) C_EXT : (int) C_STAT,
553 (int) DT_FCN << N_BTSHFT);
556 /* Keep a list of external functions. */
558 struct GTY(()) extern_list
560 struct extern_list *next;
565 static GTY(()) struct extern_list *extern_head;
567 /* Assemble an external function reference. We need to keep a list of
568 these, so that we can output the function types at the end of the
569 assembly. We can't output the types now, because we might see a
570 definition of the function later on and emit debugging information
574 i386_pe_record_external_function (tree decl, const char *name)
576 struct extern_list *p;
578 p = ggc_alloc_extern_list ();
579 p->next = extern_head;
585 /* Keep a list of exported symbols. */
587 struct GTY(()) export_list
589 struct export_list *next;
591 int is_data; /* used to type tag exported symbols. */
594 static GTY(()) struct export_list *export_head;
596 /* Assemble an export symbol entry. We need to keep a list of
597 these, so that we can output the export list at the end of the
598 assembly. We used to output these export symbols in each function,
599 but that causes problems with GNU ld when the sections are
600 linkonce. Beware, DECL may be NULL if compile_file() is emitting
604 i386_pe_maybe_record_exported_symbol (tree decl, const char *name, int is_data)
607 struct export_list *p;
612 symbol = XEXP (DECL_RTL (decl), 0);
613 gcc_assert (GET_CODE (symbol) == SYMBOL_REF);
614 if (!SYMBOL_REF_DLLEXPORT_P (symbol))
617 gcc_assert (TREE_PUBLIC (decl));
619 p = ggc_alloc_export_list ();
620 p->next = export_head;
622 p->is_data = is_data;
626 #ifdef CXX_WRAP_SPEC_LIST
628 /* Hash table equality helper function. */
631 wrapper_strcmp (const void *x, const void *y)
633 return !strcmp ((const char *) x, (const char *) y);
636 /* Search for a function named TARGET in the list of library wrappers
637 we are using, returning a pointer to it if found or NULL if not.
638 This function might be called on quite a few symbols, and we only
639 have the list of names of wrapped functions available to us as a
640 spec string, so first time round we lazily initialise a hash table
641 to make things quicker. */
644 i386_find_on_wrapper_list (const char *target)
646 static char first_time = 1;
647 static htab_t wrappers;
651 /* Beware that this is not a complicated parser, it assumes
652 that any sequence of non-whitespace beginning with an
653 underscore is one of the wrapped symbols. For now that's
654 adequate to distinguish symbols from spec substitutions
655 and command-line options. */
656 static char wrapper_list_buffer[] = CXX_WRAP_SPEC_LIST;
658 /* Breaks up the char array into separated strings
659 strings and enter them into the hash table. */
660 wrappers = htab_create_alloc (8, htab_hash_string, wrapper_strcmp,
662 for (bufptr = wrapper_list_buffer; *bufptr; ++bufptr)
665 if (ISSPACE (*bufptr))
669 while (*bufptr && !ISSPACE (*bufptr))
674 *htab_find_slot (wrappers, found, INSERT) = found;
679 return (const char *) htab_find (wrappers, target);
682 #endif /* CXX_WRAP_SPEC_LIST */
684 /* This is called at the end of assembly. For each external function
685 which has not been defined, we output a declaration now. We also
686 output the .drectve section. */
689 i386_pe_file_end (void)
691 struct extern_list *p;
693 for (p = extern_head; p != NULL; p = p->next)
699 /* Positively ensure only one declaration for any given symbol. */
700 if (! TREE_ASM_WRITTEN (decl)
701 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
703 #ifdef CXX_WRAP_SPEC_LIST
704 /* To ensure the DLL that provides the corresponding real
705 functions is still loaded at runtime, we must reference
706 the real function so that an (unused) import is created. */
707 const char *realsym = i386_find_on_wrapper_list (p->name);
709 i386_pe_declare_function_type (asm_out_file,
710 concat ("__real_", realsym, NULL), TREE_PUBLIC (decl));
711 #endif /* CXX_WRAP_SPEC_LIST */
712 TREE_ASM_WRITTEN (decl) = 1;
713 i386_pe_declare_function_type (asm_out_file, p->name,
720 struct export_list *q;
722 for (q = export_head; q != NULL; q = q->next)
724 fprintf (asm_out_file, "\t.ascii \" -export:\\\"%s\\\"%s\"\n",
725 default_strip_name_encoding (q->name),
726 (q->is_data ? ",data" : ""));
732 /* x64 Structured Exception Handling unwind info. */
734 struct seh_frame_state
736 /* SEH records saves relative to the "current" stack pointer, whether
737 or not there's a frame pointer in place. This tracks the current
738 stack pointer offset from the CFA. */
739 HOST_WIDE_INT sp_offset;
741 /* The CFA is located at CFA_REG + CFA_OFFSET. */
742 HOST_WIDE_INT cfa_offset;
746 /* Set up data structures beginning output for SEH. */
749 i386_pe_seh_init (FILE *f)
751 struct seh_frame_state *seh;
758 /* We cannot support DRAP with SEH. We turned off support for it by
759 re-defining MAX_STACK_ALIGNMENT when SEH is enabled. */
760 gcc_assert (!stack_realign_drap);
762 seh = XCNEW (struct seh_frame_state);
763 cfun->machine->seh = seh;
765 seh->sp_offset = INCOMING_FRAME_SP_OFFSET;
766 seh->cfa_offset = INCOMING_FRAME_SP_OFFSET;
767 seh->cfa_reg = stack_pointer_rtx;
769 fputs ("\t.seh_proc\t", f);
770 assemble_name (f, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (cfun->decl)));
775 i386_pe_seh_end_prologue (FILE *f)
777 struct seh_frame_state *seh;
783 seh = cfun->machine->seh;
785 /* Emit an assembler directive to set up the frame pointer. Always do
786 this last. The documentation talks about doing this "before" any
787 other code that uses offsets, but (experimentally) that's after we
788 emit the codes in reverse order (handled by the assembler). */
789 if (seh->cfa_reg != stack_pointer_rtx)
791 HOST_WIDE_INT offset = seh->sp_offset - seh->cfa_offset;
793 gcc_assert ((offset & 15) == 0);
794 gcc_assert (IN_RANGE (offset, 0, 240));
796 fputs ("\t.seh_setframe\t", f);
797 print_reg (seh->cfa_reg, 0, f);
798 fprintf (f, ", " HOST_WIDE_INT_PRINT_DEC "\n", offset);
802 cfun->machine->seh = NULL;
804 fputs ("\t.seh_endprologue\n", f);
808 i386_pe_seh_fini (FILE *f)
814 fputs ("\t.seh_endproc\n", f);
817 /* Emit an assembler directive to save REG via a PUSH. */
820 seh_emit_push (FILE *f, struct seh_frame_state *seh, rtx reg)
822 unsigned int regno = REGNO (reg);
824 gcc_checking_assert (GENERAL_REGNO_P (regno));
826 seh->sp_offset += UNITS_PER_WORD;
827 if (seh->cfa_reg == stack_pointer_rtx)
828 seh->cfa_offset += UNITS_PER_WORD;
830 fputs ("\t.seh_pushreg\t", f);
831 print_reg (reg, 0, f);
835 /* Emit an assembler directive to save REG at CFA - CFA_OFFSET. */
838 seh_emit_save (FILE *f, struct seh_frame_state *seh,
839 rtx reg, HOST_WIDE_INT cfa_offset)
841 unsigned int regno = REGNO (reg);
842 HOST_WIDE_INT offset;
844 /* Negative save offsets are of course not supported, since that
845 would be a store below the stack pointer and thus clobberable. */
846 gcc_assert (seh->sp_offset >= cfa_offset);
847 offset = seh->sp_offset - cfa_offset;
849 fputs ((SSE_REGNO_P (regno) ? "\t.seh_savexmm\t"
850 : GENERAL_REGNO_P (regno) ? "\t.seh_savereg\t"
851 : (gcc_unreachable (), "")), f);
852 print_reg (reg, 0, f);
853 fprintf (f, ", " HOST_WIDE_INT_PRINT_DEC "\n", offset);
856 /* Emit an assembler directive to adjust RSP by OFFSET. */
859 seh_emit_stackalloc (FILE *f, struct seh_frame_state *seh,
860 HOST_WIDE_INT offset)
862 /* We're only concerned with prologue stack allocations, which all
863 are subtractions from the stack pointer. */
864 gcc_assert (offset < 0);
867 if (seh->cfa_reg == stack_pointer_rtx)
868 seh->cfa_offset += offset;
869 seh->sp_offset += offset;
871 fprintf (f, "\t.seh_stackalloc\t" HOST_WIDE_INT_PRINT_DEC "\n", offset);
874 /* Process REG_CFA_ADJUST_CFA for SEH. */
877 seh_cfa_adjust_cfa (FILE *f, struct seh_frame_state *seh, rtx pat)
880 HOST_WIDE_INT reg_offset = 0;
881 unsigned int dest_regno;
883 dest = SET_DEST (pat);
886 if (GET_CODE (src) == PLUS)
888 reg_offset = INTVAL (XEXP (src, 1));
891 else if (GET_CODE (src) == MINUS)
893 reg_offset = -INTVAL (XEXP (src, 1));
896 gcc_assert (src == stack_pointer_rtx);
897 gcc_assert (seh->cfa_reg == stack_pointer_rtx);
898 dest_regno = REGNO (dest);
900 if (dest_regno == STACK_POINTER_REGNUM)
901 seh_emit_stackalloc (f, seh, reg_offset);
902 else if (dest_regno == HARD_FRAME_POINTER_REGNUM)
905 seh->cfa_offset -= reg_offset;
911 /* Process REG_CFA_OFFSET for SEH. */
914 seh_cfa_offset (FILE *f, struct seh_frame_state *seh, rtx pat)
917 HOST_WIDE_INT reg_offset;
919 dest = SET_DEST (pat);
922 gcc_assert (MEM_P (dest));
923 dest = XEXP (dest, 0);
928 gcc_assert (GET_CODE (dest) == PLUS);
929 reg_offset = INTVAL (XEXP (dest, 1));
930 dest = XEXP (dest, 0);
932 gcc_assert (dest == seh->cfa_reg);
934 seh_emit_save (f, seh, src, seh->cfa_offset - reg_offset);
937 /* Process a FRAME_RELATED_EXPR for SEH. */
940 seh_frame_related_expr (FILE *f, struct seh_frame_state *seh, rtx pat)
943 HOST_WIDE_INT addend;
945 /* See the full loop in dwarf2out_frame_debug_expr. */
946 if (GET_CODE (pat) == PARALLEL || GET_CODE (pat) == SEQUENCE)
948 int i, n = XVECLEN (pat, 0), pass, npass;
950 npass = (GET_CODE (pat) == PARALLEL ? 2 : 1);
951 for (pass = 0; pass < npass; ++pass)
952 for (i = 0; i < n; ++i)
954 rtx ele = XVECEXP (pat, 0, i);
956 if (GET_CODE (ele) != SET)
958 dest = SET_DEST (ele);
960 /* Process each member of the PARALLEL independently. The first
961 member is always processed; others only if they are marked. */
962 if (i == 0 || RTX_FRAME_RELATED_P (ele))
964 /* Evaluate all register saves in the first pass and all
965 register updates in the second pass. */
966 if ((MEM_P (dest) ^ pass) || npass == 1)
967 seh_frame_related_expr (f, seh, ele);
973 dest = SET_DEST (pat);
976 switch (GET_CODE (dest))
979 switch (GET_CODE (src))
982 /* REG = REG: This should be establishing a frame pointer. */
983 gcc_assert (src == stack_pointer_rtx);
984 gcc_assert (dest == hard_frame_pointer_rtx);
985 seh_cfa_adjust_cfa (f, seh, pat);
989 addend = INTVAL (XEXP (src, 1));
991 if (dest == hard_frame_pointer_rtx)
992 seh_cfa_adjust_cfa (f, seh, pat);
993 else if (dest == stack_pointer_rtx)
995 gcc_assert (src == stack_pointer_rtx);
996 seh_emit_stackalloc (f, seh, addend);
1008 /* A save of some kind. */
1009 dest = XEXP (dest, 0);
1010 if (GET_CODE (dest) == PRE_DEC)
1012 gcc_checking_assert (GET_MODE (src) == Pmode);
1013 gcc_checking_assert (REG_P (src));
1014 seh_emit_push (f, seh, src);
1017 seh_cfa_offset (f, seh, pat);
1025 /* This function looks at a single insn and emits any SEH directives
1026 required for unwind of this insn. */
1029 i386_pe_seh_unwind_emit (FILE *asm_out_file, rtx insn)
1032 bool handled_one = false;
1033 struct seh_frame_state *seh;
1038 /* We free the SEH data once done with the prologue. Ignore those
1039 RTX_FRAME_RELATED_P insns that are associated with the epilogue. */
1040 seh = cfun->machine->seh;
1044 if (NOTE_P (insn) || !RTX_FRAME_RELATED_P (insn))
1047 for (note = REG_NOTES (insn); note ; note = XEXP (note, 1))
1049 pat = XEXP (note, 0);
1050 switch (REG_NOTE_KIND (note))
1052 case REG_FRAME_RELATED_EXPR:
1055 case REG_CFA_DEF_CFA:
1056 case REG_CFA_EXPRESSION:
1057 /* Only emitted with DRAP, which we disable. */
1061 case REG_CFA_REGISTER:
1062 /* Only emitted in epilogues, which we skip. */
1065 case REG_CFA_ADJUST_CFA:
1068 pat = PATTERN (insn);
1069 if (GET_CODE (pat) == PARALLEL)
1070 pat = XVECEXP (pat, 0, 0);
1072 seh_cfa_adjust_cfa (asm_out_file, seh, pat);
1076 case REG_CFA_OFFSET:
1078 pat = single_set (insn);
1079 seh_cfa_offset (asm_out_file, seh, pat);
1089 pat = PATTERN (insn);
1091 seh_frame_related_expr (asm_out_file, seh, pat);
1095 i386_pe_start_function (FILE *f, const char *name, tree decl)
1097 i386_pe_maybe_record_exported_symbol (decl, name, 0);
1098 if (write_symbols != SDB_DEBUG)
1099 i386_pe_declare_function_type (f, name, TREE_PUBLIC (decl));
1100 ASM_OUTPUT_FUNCTION_LABEL (f, name, decl);
1104 i386_pe_end_function (FILE *f, const char *name ATTRIBUTE_UNUSED,
1105 tree decl ATTRIBUTE_UNUSED)
1107 i386_pe_seh_fini (f);
1111 #include "gt-winnt.h"