| /* Subroutines for insn-output.c for Windows NT. |
| Contributed by Douglas Rupp (drupp@cs.washington.edu) |
| Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
| |
| This file is part of GNU CC. |
| |
| GNU CC 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 2, or (at your option) |
| any later version. |
| |
| GNU CC 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 GNU CC; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "rtl.h" |
| #include "regs.h" |
| #include "hard-reg-set.h" |
| #include "output.h" |
| #include "tree.h" |
| #include "flags.h" |
| #include "tm_p.h" |
| #include "toplev.h" |
| #include "hashtab.h" |
| |
| /* i386/PE specific attribute support. |
| |
| i386/PE has two new attributes: |
| dllexport - for exporting a function/variable that will live in a dll |
| dllimport - for importing a function/variable from a dll |
| |
| Microsoft allows multiple declspecs in one __declspec, separating |
| them with spaces. We do NOT support this. Instead, use __declspec |
| multiple times. |
| */ |
| |
| static tree associated_type PARAMS ((tree)); |
| const char * gen_stdcall_suffix PARAMS ((tree)); |
| int i386_pe_dllexport_p PARAMS ((tree)); |
| int i386_pe_dllimport_p PARAMS ((tree)); |
| void i386_pe_mark_dllexport PARAMS ((tree)); |
| void i386_pe_mark_dllimport PARAMS ((tree)); |
| |
| /* Handle a "dllimport" or "dllexport" attribute; |
| arguments as in struct attribute_spec.handler. */ |
| tree |
| ix86_handle_dll_attribute (node, name, args, flags, no_add_attrs) |
| tree *node; |
| tree name; |
| tree args; |
| int flags; |
| bool *no_add_attrs; |
| { |
| /* These attributes may apply to structure and union types being created, |
| but otherwise should pass to the declaration involved. */ |
| if (!DECL_P (*node)) |
| { |
| if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT |
| | (int) ATTR_FLAG_ARRAY_NEXT)) |
| { |
| *no_add_attrs = true; |
| return tree_cons (name, args, NULL_TREE); |
| } |
| if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE) |
| { |
| warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); |
| *no_add_attrs = true; |
| } |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Handle a "shared" attribute; |
| arguments as in struct attribute_spec.handler. */ |
| tree |
| ix86_handle_shared_attribute (node, name, args, flags, no_add_attrs) |
| tree *node; |
| tree name; |
| tree args ATTRIBUTE_UNUSED; |
| int flags ATTRIBUTE_UNUSED; |
| bool *no_add_attrs; |
| { |
| if (TREE_CODE (*node) != VAR_DECL) |
| { |
| warning ("`%s' attribute only applies to variables", |
| IDENTIFIER_POINTER (name)); |
| *no_add_attrs = true; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Return the type that we should use to determine if DECL is |
| imported or exported. */ |
| |
| static tree |
| associated_type (decl) |
| tree decl; |
| { |
| tree t = NULL_TREE; |
| |
| /* In the C++ frontend, DECL_CONTEXT for a method doesn't actually refer |
| to the containing class. So we look at the 'this' arg. */ |
| if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE) |
| { |
| /* Artificial methods are not affected by the import/export status of |
| their class unless they are virtual. */ |
| if (! DECL_ARTIFICIAL (decl) || DECL_VINDEX (decl)) |
| t = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))); |
| } |
| else if (DECL_CONTEXT (decl) |
| && TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (decl))) == 't') |
| t = DECL_CONTEXT (decl); |
| |
| return t; |
| } |
| |
| /* Return non-zero if DECL is a dllexport'd object. */ |
| |
| int |
| i386_pe_dllexport_p (decl) |
| 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; |
| |
| /* Class members get the dllexport status of their class. */ |
| if (associated_type (decl)) |
| { |
| exp = lookup_attribute ("dllexport", |
| TYPE_ATTRIBUTES (associated_type (decl))); |
| if (exp) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Return non-zero if DECL is a dllimport'd object. */ |
| |
| int |
| i386_pe_dllimport_p (decl) |
| 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; |
| |
| /* Class members get the dllimport status of their class. */ |
| if (associated_type (decl)) |
| { |
| imp = lookup_attribute ("dllimport", |
| TYPE_ATTRIBUTES (associated_type (decl))); |
| if (imp) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Return non-zero if SYMBOL is marked as being dllexport'd. */ |
| |
| int |
| i386_pe_dllexport_name_p (symbol) |
| const char *symbol; |
| { |
| return symbol[0] == '@' && symbol[1] == 'e' && symbol[2] == '.'; |
| } |
| |
| /* Return non-zero if SYMBOL is marked as being dllimport'd. */ |
| |
| int |
| i386_pe_dllimport_name_p (symbol) |
| const char *symbol; |
| { |
| return symbol[0] == '@' && symbol[1] == 'i' && symbol[2] == '.'; |
| } |
| |
| /* Mark a DECL as being dllexport'd. |
| Note that we override the previous setting (eg: dllimport). */ |
| |
| void |
| i386_pe_mark_dllexport (decl) |
| tree decl; |
| { |
| const char *oldname; |
| char *newname; |
| rtx rtlname; |
| tree idp; |
| |
| rtlname = XEXP (DECL_RTL (decl), 0); |
| if (GET_CODE (rtlname) == SYMBOL_REF) |
| oldname = XSTR (rtlname, 0); |
| else if (GET_CODE (rtlname) == MEM |
| && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF) |
| oldname = XSTR (XEXP (rtlname, 0), 0); |
| else |
| abort (); |
| if (i386_pe_dllimport_name_p (oldname)) |
| oldname += 9; |
| else if (i386_pe_dllexport_name_p (oldname)) |
| return; /* already done */ |
| |
| newname = alloca (strlen (oldname) + 4); |
| sprintf (newname, "@e.%s", 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)); |
| } |
| |
| /* Mark a DECL as being dllimport'd. */ |
| |
| void |
| i386_pe_mark_dllimport (decl) |
| tree decl; |
| { |
| const char *oldname; |
| char *newname; |
| tree idp; |
| rtx rtlname, newrtl; |
| |
| rtlname = XEXP (DECL_RTL (decl), 0); |
| if (GET_CODE (rtlname) == SYMBOL_REF) |
| oldname = XSTR (rtlname, 0); |
| else if (GET_CODE (rtlname) == MEM |
| && GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF) |
| oldname = XSTR (XEXP (rtlname, 0), 0); |
| else |
| abort (); |
| if (i386_pe_dllexport_name_p (oldname)) |
| { |
| error ("`%s' declared as both exported to and imported from a DLL", |
| IDENTIFIER_POINTER (DECL_NAME (decl))); |
| return; |
| } |
| else if (i386_pe_dllimport_name_p (oldname)) |
| { |
| /* Already done, but force correct linkage since the redeclaration |
| might have omitted explicit extern. 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; |
| } |
| return; |
| } |
| |
| /* ??? One can well ask why we're making these checks here, |
| and that would be a good question. */ |
| |
| /* Imported variables can't be initialized. Note that C++ classes |
| are marked initial, so we need to check. */ |
| if (TREE_CODE (decl) == VAR_DECL |
| && !DECL_VIRTUAL_P (decl) |
| && (DECL_INITIAL (decl) |
| && ! TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))) |
| { |
| error_with_decl (decl, "initialized variable `%s' is marked dllimport"); |
| return; |
| } |
| /* Nor can they be static. */ |
| if (TREE_CODE (decl) == VAR_DECL |
| /* ??? Is this test for vtables needed? */ |
| && !DECL_VIRTUAL_P (decl) |
| && 0 /*???*/) |
| { |
| error_with_decl (decl, "static variable `%s' is marked dllimport"); |
| 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 = alloca (strlen (oldname) + 11); |
| sprintf (newname, "@i._imp__%s", 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 (MEM, Pmode, |
| gen_rtx (SYMBOL_REF, Pmode, |
| IDENTIFIER_POINTER (idp))); |
| XEXP (DECL_RTL (decl), 0) = newrtl; |
| |
| /* Can't treat a pointer to this as a constant address */ |
| DECL_NON_ADDR_CONST_P (decl) = 1; |
| } |
| |
| /* Return string which is the former assembler name modified with a |
| suffix consisting of an atsign (@) followed by the number of bytes of |
| arguments */ |
| |
| const char * |
| gen_stdcall_suffix (decl) |
| tree decl; |
| { |
| int total = 0; |
| /* ??? This probably should use XSTR (XEXP (DECL_RTL (decl), 0), 0) instead |
| of DECL_ASSEMBLER_NAME. */ |
| const char *asmname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); |
| char *newsym; |
| |
| if (TYPE_ARG_TYPES (TREE_TYPE (decl))) |
| if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (decl)))) |
| == void_type_node) |
| { |
| tree formal_type = TYPE_ARG_TYPES (TREE_TYPE (decl)); |
| |
| while (TREE_VALUE (formal_type) != void_type_node) |
| { |
| int parm_size |
| = TREE_INT_CST_LOW (TYPE_SIZE (TREE_VALUE (formal_type))); |
| /* Must round up to include padding. This is done the same |
| way as in store_one_arg. */ |
| parm_size = ((parm_size + PARM_BOUNDARY - 1) |
| / PARM_BOUNDARY * PARM_BOUNDARY); |
| total += parm_size; |
| formal_type = TREE_CHAIN (formal_type); |
| } |
| } |
| |
| newsym = xmalloc (strlen (asmname) + 10); |
| sprintf (newsym, "%s@%d", asmname, total/BITS_PER_UNIT); |
| return IDENTIFIER_POINTER (get_identifier (newsym)); |
| } |
| |
| /* Cover function to implement ENCODE_SECTION_INFO. */ |
| |
| void |
| i386_pe_encode_section_info (decl) |
| tree decl; |
| { |
| /* This bit is copied from i386.h. */ |
| if (optimize > 0 && TREE_CONSTANT (decl) |
| && (!flag_writable_strings || TREE_CODE (decl) != STRING_CST)) |
| { |
| rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd' |
| ? TREE_CST_RTL (decl) : DECL_RTL (decl)); |
| SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1; |
| } |
| |
| if (TREE_CODE (decl) == FUNCTION_DECL) |
| if (lookup_attribute ("stdcall", |
| TYPE_ATTRIBUTES (TREE_TYPE (decl)))) |
| XEXP (DECL_RTL (decl), 0) = |
| gen_rtx (SYMBOL_REF, Pmode, gen_stdcall_suffix (decl)); |
| |
| /* Mark the decl so we can tell from the rtl whether the object is |
| dllexport'd or dllimport'd. */ |
| |
| if (i386_pe_dllexport_p (decl)) |
| i386_pe_mark_dllexport (decl); |
| else if (i386_pe_dllimport_p (decl)) |
| i386_pe_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. Ditto |
| for the DECL_NON_ADDR_CONST_P flag. */ |
| 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 |
| && i386_pe_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; |
| |
| DECL_NON_ADDR_CONST_P (decl) = 0; |
| |
| /* We previously set TREE_PUBLIC and DECL_EXTERNAL. |
| We leave these alone for now. */ |
| } |
| } |
| |
| /* Cover function for UNIQUE_SECTION. */ |
| |
| void |
| i386_pe_unique_section (decl, reloc) |
| tree decl; |
| int reloc; |
| { |
| int len; |
| const char *name, *prefix; |
| char *string; |
| |
| name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); |
| /* Strip off any encoding in fnname. */ |
| STRIP_NAME_ENCODING (name, 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). Don't put |
| read-only data in .rdata section to avoid a PE linker |
| bug when .rdata$* grouped sections are used in code |
| without a .rdata section. */ |
| if (TREE_CODE (decl) == FUNCTION_DECL) |
| prefix = ".text$"; |
| /* else if (DECL_INITIAL (decl) == 0 |
| || DECL_INITIAL (decl) == error_mark_node) |
| prefix = ".bss"; */ |
| else if (DECL_READONLY_SECTION (decl, reloc)) |
| #ifdef READONLY_DATA_SECTION |
| prefix = ".rdata$"; |
| #else |
| prefix = ".text$"; |
| #endif |
| else |
| prefix = ".data$"; |
| len = strlen (name) + strlen (prefix); |
| string = alloca (len + 1); |
| sprintf (string, "%s%s", prefix, name); |
| |
| DECL_SECTION_NAME (decl) = build_string (len, string); |
| } |
| |
| /* Select a set of attributes for section NAME based on the properties |
| of DECL and whether or not RELOC indicates that DECL's initializer |
| might contain runtime relocations. |
| |
| We make the section read-only and executable for a function decl, |
| read-only for a const data decl, and writable for a non-const data decl. |
| |
| If the section has already been defined, to not allow it to have |
| different attributes, as (1) this is ambiguous since we're not seeing |
| all the declarations up front and (2) some assemblers (e.g. SVR4) |
| do not recoginize section redefinitions. */ |
| /* ??? This differs from the "standard" PE implementation in that we |
| handle the SHARED variable attribute. Should this be done for all |
| PE targets? */ |
| |
| #define SECTION_PE_SHARED SECTION_MACH_DEP |
| |
| unsigned int |
| i386_pe_section_type_flags (decl, name, reloc) |
| tree decl; |
| const char *name; |
| int reloc; |
| { |
| static htab_t htab; |
| unsigned int flags; |
| unsigned int **slot; |
| |
| /* The names we put in the hashtable will always be the unique |
| versions gived to us by the stringtable, so we can just use |
| their addresses as the keys. */ |
| if (!htab) |
| htab = htab_create (31, htab_hash_pointer, htab_eq_pointer, NULL); |
| |
| if (decl && TREE_CODE (decl) == FUNCTION_DECL) |
| flags = SECTION_CODE; |
| else if (decl && DECL_READONLY_SECTION (decl, reloc)) |
| flags = 0; |
| else |
| { |
| flags = SECTION_WRITE; |
| |
| 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" : ""); |
| } |
| } |
| } |
| |