2 * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Dumps global variables and constants as gas assembler.
23 * @author Christian Wuerdig, Matthias Braun
44 #include "beemitter.h"
47 /** by default, we generate assembler code for the Linux gas */
48 object_file_format_t be_gas_object_file_format = OBJECT_FILE_FORMAT_ELF;
49 elf_variant_t be_gas_elf_variant = ELF_VARIANT_NORMAL;
50 bool be_gas_emit_types = true;
51 char be_gas_elf_type_char = '@';
53 static be_gas_section_t current_section = (be_gas_section_t) -1;
56 * An environment containing all needed dumper data.
57 * Currently we create the file completely in memory first, then
58 * write it to the disk. This is an artifact from the old C-generating backend
59 * and even there NOT needed. So we might change it in the future.
61 typedef struct be_gas_decl_env {
62 be_gas_section_t section;
63 const be_main_env_t *main_env;
66 static void emit_section_macho(be_gas_section_t section)
68 be_gas_section_t base = section & GAS_SECTION_TYPE_MASK;
69 be_gas_section_t flags = section & ~GAS_SECTION_TYPE_MASK;
72 if (current_section == section)
74 current_section = section;
79 case GAS_SECTION_TEXT: name = "text"; break;
80 case GAS_SECTION_DATA: name = "data"; break;
81 case GAS_SECTION_RODATA: name = "const"; break;
82 case GAS_SECTION_BSS: name = "data"; break;
83 case GAS_SECTION_CONSTRUCTORS: name = "mod_init_func"; break;
84 case GAS_SECTION_DESTRUCTORS: name = "mod_term_func"; break;
85 case GAS_SECTION_PIC_TRAMPOLINES: name = "section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5"; break;
86 case GAS_SECTION_PIC_SYMBOLS: name = "section\t__IMPORT,__pointers,non_lazy_symbol_pointers"; break;
87 case GAS_SECTION_CSTRING: name = "cstring"; break;
88 case GAS_SECTION_DEBUG_INFO: name = "section __DWARF,__debug_info,regular,debug"; break;
89 case GAS_SECTION_DEBUG_ABBREV: name = "section __DWARF,__debug_abbrev,regular,debug"; break;
90 case GAS_SECTION_DEBUG_LINE: name = "section __DWARF,__debug_line,regular,debug"; break;
91 case GAS_SECTION_DEBUG_PUBNAMES: name = "section __DWARF,__debug_pubnames,regular,debug"; break;
92 case GAS_SECTION_DEBUG_FRAME: name = "section __DWARF,__debug_frame,regular,debug"; break;
93 default: panic("unsupported scetion type 0x%X", section);
95 be_emit_irprintf("\t.%s\n", name);
97 } else if (flags & GAS_SECTION_FLAG_COMDAT) {
99 case GAS_SECTION_TEXT: name = "section __TEXT,__textcoal_nt,coalesced,pure_instructions"; break;
100 case GAS_SECTION_BSS:
101 case GAS_SECTION_DATA: name = "section __DATA,__datacoal_nt,coalesced"; break;
102 case GAS_SECTION_RODATA: name = "section __TEXT,__const_coal,coalesced"; break;
103 case GAS_SECTION_CSTRING: name = "section __TEXT,__const_coal,coalesced"; break;
104 default: panic("unsupported scetion type 0x%X", section);
106 } else if (flags & GAS_SECTION_FLAG_TLS) {
107 panic("thread local storage not supported on macho (section 0x%X)", section);
109 panic("unsupported section type 0x%X", section);
113 static void emit_section_sparc(be_gas_section_t section, const ir_entity *entity)
115 be_gas_section_t base = section & GAS_SECTION_TYPE_MASK;
116 be_gas_section_t flags = section & ~GAS_SECTION_TYPE_MASK;
117 static const char *const basename[GAS_SECTION_LAST+1] = {
125 NULL, /* pic trampolines */
126 NULL, /* pic symbols */
134 if (current_section == section && !(section & GAS_SECTION_FLAG_COMDAT))
136 current_section = section;
138 be_emit_cstring("\t.section\t\".");
140 /* Part1: section-name */
141 if (flags & GAS_SECTION_FLAG_TLS)
143 assert(base < (be_gas_section_t)ARRAY_SIZE(basename));
144 be_emit_string(basename[base]);
146 if (flags & GAS_SECTION_FLAG_COMDAT) {
148 be_gas_emit_entity(entity);
152 /* for the simple sections we're done here */
156 be_emit_cstring(",#alloc");
159 case GAS_SECTION_TEXT: be_emit_cstring(",#execinstr"); break;
160 case GAS_SECTION_DATA:
161 case GAS_SECTION_BSS: be_emit_cstring(",#write"); break;
166 if (flags & GAS_SECTION_FLAG_TLS) {
167 be_emit_cstring(",#tls");
172 be_emit_write_line();
175 static void emit_section(be_gas_section_t section, const ir_entity *entity)
177 be_gas_section_t base = section & GAS_SECTION_TYPE_MASK;
178 be_gas_section_t flags = section & ~GAS_SECTION_TYPE_MASK;
180 static const struct {
184 } sectioninfos[GAS_SECTION_LAST+1] = {
185 { "text", "progbits", "ax" },
186 { "data", "progbits", "aw" },
187 { "rodata", "progbits", "a" },
188 { "bss", "nobits", "aw" },
189 { "ctors", "progbits", "aw" },
190 { "dtors", "progbits", "aw" },
191 { NULL, NULL, NULL }, /* cstring */
192 { NULL, NULL, NULL }, /* pic trampolines */
193 { NULL, NULL, NULL }, /* pic symbols */
194 { "debug_info", "progbits", "" },
195 { "debug_abbrev", "progbits", "" },
196 { "debug_line", "progbits", "" },
197 { "debug_pubnames", "progbits", "" },
198 { "debug_frame", "progbits", "" },
201 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
202 emit_section_macho(section);
204 } else if(be_gas_elf_variant == ELF_VARIANT_SPARC) {
205 emit_section_sparc(section, entity);
209 if (current_section == section && !(section & GAS_SECTION_FLAG_COMDAT))
211 current_section = section;
216 case GAS_SECTION_TEXT:
217 be_emit_cstring("\t.text\n");
218 be_emit_write_line();
220 case GAS_SECTION_DATA:
221 be_emit_cstring("\t.data\n");
222 be_emit_write_line();
224 case GAS_SECTION_RODATA:
225 be_emit_cstring("\t.section\t.rodata\n");
226 be_emit_write_line();
228 case GAS_SECTION_BSS:
229 be_emit_cstring("\t.bss\n");
230 be_emit_write_line();
237 assert(base < (be_gas_section_t) ARRAY_SIZE(sectioninfos));
238 be_emit_cstring("\t.section\t.");
240 if (flags & GAS_SECTION_FLAG_TLS)
242 be_emit_string(sectioninfos[base].name);
243 if (flags & GAS_SECTION_FLAG_COMDAT) {
245 be_gas_emit_entity(entity);
249 be_emit_cstring(",\"");
250 for (f = sectioninfos[base].flags; *f != '\0'; ++f) {
253 if (flags & GAS_SECTION_FLAG_TLS)
255 if (flags & GAS_SECTION_FLAG_COMDAT)
259 if (be_gas_object_file_format != OBJECT_FILE_FORMAT_COFF) {
260 be_emit_cstring("\",");
261 be_emit_char(be_gas_elf_type_char);
262 be_emit_string(sectioninfos[base].type);
265 if (flags & GAS_SECTION_FLAG_COMDAT) {
267 be_gas_emit_entity(entity);
268 be_emit_cstring(",comdat");
271 be_emit_write_line();
276 void be_gas_emit_switch_section(be_gas_section_t section)
278 /* you have to produce a switch_section call with entity manually
279 * for comdat sections */
280 assert( !(section & GAS_SECTION_FLAG_COMDAT));
282 emit_section(section, NULL);
285 static ir_tarval *get_initializer_tarval(const ir_initializer_t *initializer)
287 if (initializer->kind == IR_INITIALIZER_TARVAL)
288 return initializer->tarval.value;
289 if (initializer->kind == IR_INITIALIZER_CONST) {
290 ir_node *node = initializer->consti.value;
291 if (is_Const(node)) {
292 return get_Const_tarval(node);
295 return get_tarval_undefined();
298 static bool initializer_is_string_const(const ir_initializer_t *initializer)
301 bool found_printable = false;
303 if (initializer->kind != IR_INITIALIZER_COMPOUND)
306 len = initializer->compound.n_initializers;
309 for (i = 0; i < len; ++i) {
313 ir_initializer_t *sub_initializer
314 = initializer->compound.initializers[i];
316 tv = get_initializer_tarval(sub_initializer);
317 if (!tarval_is_constant(tv))
320 mode = get_tarval_mode(tv);
321 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
324 c = get_tarval_long(tv);
325 if (isgraph(c) || isspace(c))
326 found_printable = true;
330 if (i == len - 1 && c != '\0')
334 return found_printable;
337 static bool initializer_is_null(const ir_initializer_t *initializer)
339 switch (initializer->kind) {
340 case IR_INITIALIZER_NULL:
342 case IR_INITIALIZER_TARVAL: {
343 ir_tarval *tv = initializer->tarval.value;
344 return tarval_is_null(tv);
346 case IR_INITIALIZER_CONST: {
347 ir_node *value = initializer->consti.value;
348 if (!is_Const(value))
350 return is_Const_null(value);
352 case IR_INITIALIZER_COMPOUND: {
354 for (i = 0; i < initializer->compound.n_initializers; ++i) {
355 ir_initializer_t *subinitializer
356 = initializer->compound.initializers[i];
357 if (!initializer_is_null(subinitializer))
363 panic("invalid initializer in initializer_is_null");
367 * Determine if an entity is a string constant
368 * @param ent The entity
369 * @return 1 if it is a string constant, 0 otherwise
371 static int entity_is_string_const(const ir_entity *ent)
373 ir_type *type, *element_type;
377 type = get_entity_type(ent);
379 /* if it's an array */
380 if (!is_Array_type(type))
383 element_type = get_array_element_type(type);
385 /* and the array's element type is primitive */
386 if (!is_Primitive_type(element_type))
389 /* and the mode of the element type is an int of
390 * the same size as the byte mode */
391 mode = get_type_mode(element_type);
392 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
395 if (ent->initializer != NULL) {
396 return initializer_is_string_const(ent->initializer);
397 } else if (entity_has_compound_ent_values(ent)) {
398 int found_printable = 0;
399 /* if it contains only printable chars and a 0 at the end */
400 n = get_compound_ent_n_values(ent);
401 for (i = 0; i < n; ++i) {
402 ir_node *irn = get_compound_ent_value(ent, i);
406 c = (int) get_tarval_long(get_Const_tarval(irn));
408 if (isgraph(c) || isspace(c))
413 if (i == n - 1 && c != '\0')
416 return found_printable;
422 static bool entity_is_null(const ir_entity *entity)
424 if (entity->initializer != NULL) {
425 return initializer_is_null(entity->initializer);
426 } else if (entity_has_compound_ent_values(entity)) {
427 /* I'm too lazy to implement this case as compound graph paths will be
428 * remove anyway in the future */
431 /* uninitialized, NULL is fine */
435 static bool is_comdat(const ir_entity *entity)
437 ir_linkage linkage = get_entity_linkage(entity);
438 return (linkage & IR_LINKAGE_MERGE)
439 && (linkage & IR_LINKAGE_GARBAGE_COLLECT);
442 static be_gas_section_t determine_basic_section(const ir_entity *entity)
446 if (is_method_entity(entity))
447 return GAS_SECTION_TEXT;
449 linkage = get_entity_linkage(entity);
450 if (linkage & IR_LINKAGE_CONSTANT) {
451 /* mach-o is the only one with a cstring section */
452 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O
453 && entity_is_string_const(entity))
454 return GAS_SECTION_CSTRING;
456 return GAS_SECTION_RODATA;
458 if (entity_is_null(entity))
459 return GAS_SECTION_BSS;
461 return GAS_SECTION_DATA;
464 static be_gas_section_t determine_section(be_gas_decl_env_t *env,
465 const ir_entity *entity)
467 ir_type *owner = get_entity_owner(entity);
469 if (owner == get_segment_type(IR_SEGMENT_GLOBAL)) {
470 be_gas_section_t section = determine_basic_section(entity);
471 if (is_comdat(entity))
472 section |= GAS_SECTION_FLAG_COMDAT;
474 } else if (env != NULL && owner == env->main_env->pic_symbols_type) {
475 return GAS_SECTION_PIC_SYMBOLS;
476 } else if (env != NULL && owner == env->main_env->pic_trampolines_type) {
477 return GAS_SECTION_PIC_TRAMPOLINES;
478 } else if (owner == get_segment_type(IR_SEGMENT_CONSTRUCTORS)) {
479 return GAS_SECTION_CONSTRUCTORS;
480 } else if (owner == get_segment_type(IR_SEGMENT_DESTRUCTORS)) {
481 return GAS_SECTION_DESTRUCTORS;
482 } else if (owner == get_segment_type(IR_SEGMENT_THREAD_LOCAL)) {
483 be_gas_section_t section = determine_basic_section(entity);
484 if (is_comdat(entity))
485 section |= GAS_SECTION_FLAG_COMDAT;
487 return section | GAS_SECTION_FLAG_TLS;
490 /* the java frontend keeps some functions inside classes */
491 if (is_Class_type(owner)) {
492 return determine_basic_section(entity);
495 panic("Couldn't determine section for %+F?!?", entity);
498 static void emit_weak(const ir_entity *entity)
500 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
501 be_emit_cstring("\t.weak_reference ");
503 be_emit_cstring("\t.weak ");
505 be_gas_emit_entity(entity);
507 be_emit_write_line();
510 static void emit_visibility(const ir_entity *entity)
512 ir_linkage linkage = get_entity_linkage(entity);
514 if (get_entity_linkage(entity) & IR_LINKAGE_WEAK) {
516 /* Note: .weak seems to imply .globl so no need to output .globl */
517 } else if (get_entity_visibility(entity) == ir_visibility_default) {
518 be_emit_cstring(".globl ");
519 be_gas_emit_entity(entity);
521 be_emit_write_line();
524 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O
525 && (linkage & IR_LINKAGE_HIDDEN_USER)
526 && get_entity_ld_name(entity)[0] != '\0') {
527 be_emit_cstring("\t.no_dead_strip ");
528 be_gas_emit_entity(entity);
530 be_emit_write_line();
534 void be_gas_emit_function_prolog(const ir_entity *entity, unsigned po2alignment, const parameter_dbg_info_t *parameter_infos)
536 be_gas_section_t section;
538 be_dwarf_method_before(entity, parameter_infos);
540 section = determine_section(NULL, entity);
541 emit_section(section, entity);
543 /* write the begin line (makes the life easier for scripts parsing the
545 be_emit_cstring("# -- Begin ");
546 be_gas_emit_entity(entity);
548 be_emit_write_line();
550 if (po2alignment > 0) {
551 const char *fill_byte = "";
552 unsigned maximum_skip = (1 << po2alignment) - 1;
553 /* gcc fills space between function with 0x90... */
554 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
557 be_emit_cstring("\t.p2align ");
558 be_emit_irprintf("%u,%s,%u\n", po2alignment, fill_byte, maximum_skip);
559 be_emit_write_line();
561 emit_visibility(entity);
563 switch (be_gas_object_file_format) {
564 case OBJECT_FILE_FORMAT_ELF:
565 be_emit_cstring("\t.type\t");
566 be_gas_emit_entity(entity);
567 be_emit_cstring(", ");
568 be_emit_char(be_gas_elf_type_char);
569 be_emit_cstring("function\n");
570 be_emit_write_line();
572 case OBJECT_FILE_FORMAT_COFF:
573 be_emit_cstring("\t.def\t");
574 be_gas_emit_entity(entity);
575 be_emit_cstring(";");
576 if (get_entity_visibility(entity) == ir_visibility_local) {
577 be_emit_cstring("\t.scl\t3;");
579 be_emit_cstring("\t.scl\t2;");
581 be_emit_cstring("\t.type\t32;\t.endef\n");
582 be_emit_write_line();
584 case OBJECT_FILE_FORMAT_MACH_O:
587 be_gas_emit_entity(entity);
588 be_emit_cstring(":\n");
589 be_emit_write_line();
591 be_dwarf_method_begin();
594 void be_gas_emit_function_epilog(const ir_entity *entity)
596 be_dwarf_method_end();
598 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_ELF) {
599 be_emit_cstring("\t.size\t");
600 be_gas_emit_entity(entity);
601 be_emit_cstring(", .-");
602 be_gas_emit_entity(entity);
604 be_emit_write_line();
607 be_emit_cstring("# -- End ");
608 be_gas_emit_entity(entity);
610 be_emit_write_line();
613 be_emit_write_line();
619 * @param tv the tarval
620 * @param bytes the width of the tarvals value in bytes
622 static void emit_arith_tarval(ir_tarval *tv, unsigned bytes)
626 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
630 be_emit_irprintf("0x%02x%02x",
631 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
635 be_emit_irprintf("0x%02x%02x%02x%02x",
636 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
637 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
641 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
642 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
643 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
644 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
645 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
649 panic("Can't dump a tarval with %d bytes", bytes);
653 * Return the label prefix for labeled instructions.
655 const char *be_gas_insn_label_prefix(void)
661 * Return the tarval of an atomic initializer.
663 * @param init a node representing the initializer (on the const code irg)
667 static ir_tarval *get_atomic_init_tv(ir_node *init)
670 ir_mode *mode = get_irn_mode(init);
672 switch (get_irn_opcode(init)) {
675 init = get_Cast_op(init);
679 init = get_Conv_op(init);
683 return get_Const_tarval(init);
686 switch (get_SymConst_kind(init)) {
687 case symconst_type_size:
688 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
690 case symconst_type_align:
691 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
693 case symconst_ofs_ent:
694 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
696 case symconst_enum_const:
697 return get_enumeration_value(get_SymConst_enum(init));
710 * Dump an atomic value.
712 * @param env the gas output environment
713 * @param init a node representing the atomic value (on the const code irg)
715 static void emit_init_expression(be_gas_decl_env_t *env, ir_node *init)
717 ir_mode *mode = get_irn_mode(init);
718 int bytes = get_mode_size_bytes(mode);
722 init = skip_Id(init);
724 switch (get_irn_opcode(init)) {
726 emit_init_expression(env, get_Cast_op(init));
730 emit_init_expression(env, get_Conv_op(init));
734 tv = get_Const_tarval(init);
736 /* it's an arithmetic value */
737 emit_arith_tarval(tv, bytes);
741 switch (get_SymConst_kind(init)) {
742 case symconst_addr_ent:
743 ent = get_SymConst_entity(init);
744 be_gas_emit_entity(ent);
747 case symconst_ofs_ent:
748 ent = get_SymConst_entity(init);
749 be_emit_irprintf("%d", get_entity_offset(ent));
752 case symconst_type_size:
753 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
756 case symconst_type_align:
757 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
760 case symconst_enum_const:
761 tv = get_enumeration_value(get_SymConst_enum(init));
762 emit_arith_tarval(tv, bytes);
766 assert(!"emit_atomic_init(): don't know how to init from this SymConst");
771 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
772 panic("Constant must be int or pointer for '+' to work");
774 emit_init_expression(env, get_Add_left(init));
775 be_emit_cstring(" + ");
776 emit_init_expression(env, get_Add_right(init));
780 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
781 panic("Constant must be int or pointer for '-' to work");
783 emit_init_expression(env, get_Sub_left(init));
784 be_emit_cstring(" - ");
785 emit_init_expression(env, get_Sub_right(init));
789 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
790 panic("Constant must be int or pointer for '*' to work");
792 emit_init_expression(env, get_Mul_left(init));
793 be_emit_cstring(" * ");
794 emit_init_expression(env, get_Mul_right(init));
798 be_emit_cstring("0");
802 panic("emit_atomic_init(): unsupported IR-node %+F", init);
807 * Dumps the type for given size (.byte, .long, ...)
809 * @param size the size in bytes
811 static void emit_size_type(size_t size)
814 case 1: be_emit_cstring("\t.byte\t"); break;
815 case 2: be_emit_cstring("\t.short\t"); break;
816 case 4: be_emit_cstring("\t.long\t"); break;
817 case 8: be_emit_cstring("\t.quad\t"); break;
820 panic("Try to dump a type with %u bytes", (unsigned)size);
825 * Dump a string constant.
826 * No checks are made!!
828 * @param ent The entity to dump.
830 static void emit_string_cst(const ir_entity *ent)
838 len = get_compound_ent_n_values(ent);
840 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
841 be_emit_cstring("\t.ascii \"");
843 be_emit_cstring("\t.string \"");
847 for (i = 0; i < output_len; ++i) {
851 irn = get_compound_ent_value(ent, i);
852 c = (int) get_tarval_long(get_Const_tarval(irn));
855 case '"' : be_emit_cstring("\\\""); break;
856 case '\n': be_emit_cstring("\\n"); break;
857 case '\r': be_emit_cstring("\\r"); break;
858 case '\t': be_emit_cstring("\\t"); break;
859 case '\\': be_emit_cstring("\\\\"); break;
864 be_emit_irprintf("\\%03o", c);
868 be_emit_cstring("\"\n");
869 be_emit_write_line();
871 type = get_entity_type(ent);
872 type_size = get_type_size_bytes(type);
873 remaining_space = type_size - len;
874 assert(remaining_space >= 0);
875 if (remaining_space > 0) {
876 be_emit_irprintf("\t.space\t%d, 0\n", remaining_space);
880 static size_t emit_string_initializer(const ir_initializer_t *initializer)
884 len = initializer->compound.n_initializers;
885 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
886 be_emit_cstring("\t.ascii \"");
888 be_emit_cstring("\t.string \"");
892 for (i = 0; i < len; ++i) {
893 const ir_initializer_t *sub_initializer
894 = get_initializer_compound_value(initializer, i);
896 ir_tarval *tv = get_initializer_tarval(sub_initializer);
897 int c = get_tarval_long(tv);
900 case '"' : be_emit_cstring("\\\""); break;
901 case '\n': be_emit_cstring("\\n"); break;
902 case '\r': be_emit_cstring("\\r"); break;
903 case '\t': be_emit_cstring("\\t"); break;
904 case '\\': be_emit_cstring("\\\\"); break;
909 be_emit_irprintf("\\%03o", c);
913 be_emit_cstring("\"\n");
914 be_emit_write_line();
916 return initializer->compound.n_initializers;
919 typedef enum normal_or_bitfield_kind {
924 } normal_or_bitfield_kind;
927 normal_or_bitfield_kind kind;
932 unsigned char bf_val;
933 const ir_initializer_t *string;
935 } normal_or_bitfield;
937 static size_t get_initializer_size(const ir_initializer_t *initializer,
940 switch (get_initializer_kind(initializer)) {
941 case IR_INITIALIZER_TARVAL:
942 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
943 return get_type_size_bytes(type);
944 case IR_INITIALIZER_CONST:
945 case IR_INITIALIZER_NULL:
946 return get_type_size_bytes(type);
947 case IR_INITIALIZER_COMPOUND:
948 if (is_Array_type(type)) {
949 if (is_array_variable_size(type)) {
950 ir_type *element_type = get_array_element_type(type);
951 unsigned element_size = get_type_size_bytes(element_type);
952 unsigned element_align
953 = get_type_alignment_bytes(element_type);
954 unsigned misalign = element_size % element_align;
956 = get_initializer_compound_n_entries(initializer);
957 element_size += element_align - misalign;
958 return n_inits * element_size;
960 return get_type_size_bytes(type);
963 assert(is_compound_type(type));
964 size_t size = get_type_size_bytes(type);
965 if (is_compound_variable_size(type)) {
966 /* last initializer has to be an array of variable size */
967 size_t l = get_initializer_compound_n_entries(initializer)-1;
968 const ir_initializer_t *last
969 = get_initializer_compound_value(initializer, l);
970 const ir_entity *last_ent = get_compound_member(type, l);
971 ir_type *last_type = get_entity_type(last_ent);
972 assert(is_array_variable_size(last_type));
973 size += get_initializer_size(last, last_type);
979 panic("found invalid initializer");
983 static normal_or_bitfield *glob_vals;
984 static size_t max_vals;
987 static void emit_bitfield(normal_or_bitfield *vals, size_t offset_bits,
988 const ir_initializer_t *initializer, ir_type *type)
990 static const size_t BITS_PER_BYTE = 8;
991 ir_mode *mode = get_type_mode(type);
992 ir_tarval *tv = NULL;
996 bool big_endian = be_get_backend_param()->byte_order_big_endian;
998 switch (get_initializer_kind(initializer)) {
999 case IR_INITIALIZER_NULL:
1001 case IR_INITIALIZER_TARVAL:
1002 tv = get_initializer_tarval_value(initializer);
1004 case IR_INITIALIZER_CONST: {
1005 ir_node *node = get_initializer_const_value(initializer);
1006 if (!is_Const(node)) {
1007 panic("bitfield initializer not a Const node");
1009 tv = get_Const_tarval(node);
1012 case IR_INITIALIZER_COMPOUND:
1013 panic("bitfield initializer is compound");
1016 panic("Couldn't get numeric value for bitfield initializer");
1018 tv = tarval_convert_to(tv, get_type_mode(type));
1020 value_len = get_type_size_bytes(get_primitive_base_type(type));
1022 end = get_mode_size_bits(mode);
1023 while (bit_offset < end) {
1024 size_t src_offset = bit_offset / BITS_PER_BYTE;
1025 size_t src_offset_bits = bit_offset % BITS_PER_BYTE;
1026 size_t dst_offset = (bit_offset+offset_bits) / BITS_PER_BYTE;
1027 size_t dst_offset_bits = (bit_offset+offset_bits) % BITS_PER_BYTE;
1028 size_t src_bits_len = end-bit_offset;
1029 size_t dst_bits_len = BITS_PER_BYTE-dst_offset_bits;
1030 unsigned char curr_bits;
1031 normal_or_bitfield *val;
1032 if (src_bits_len > dst_bits_len)
1033 src_bits_len = dst_bits_len;
1036 val = &vals[value_len - dst_offset - 1];
1038 val = &vals[dst_offset];
1041 assert((val-glob_vals) < (ptrdiff_t) max_vals);
1042 assert(val->kind == BITFIELD ||
1043 (val->kind == NORMAL && val->v.value == NULL));
1044 val->kind = BITFIELD;
1045 curr_bits = get_tarval_sub_bits(tv, src_offset);
1046 curr_bits = curr_bits >> src_offset_bits;
1047 if (src_offset_bits + src_bits_len > 8) {
1048 unsigned next_bits = get_tarval_sub_bits(tv, src_offset+1);
1049 curr_bits |= next_bits << (8 - src_offset_bits);
1051 curr_bits &= (1 << src_bits_len) - 1;
1052 val->v.bf_val |= curr_bits << dst_offset_bits;
1054 bit_offset += dst_bits_len;
1058 static void emit_ir_initializer(normal_or_bitfield *vals,
1059 const ir_initializer_t *initializer,
1062 assert((size_t) (vals - glob_vals) < max_vals);
1064 if (initializer_is_string_const(initializer)) {
1065 assert(vals->kind != BITFIELD);
1066 vals->kind = STRING;
1067 vals->v.string = initializer;
1071 switch (get_initializer_kind(initializer)) {
1072 case IR_INITIALIZER_NULL:
1074 case IR_INITIALIZER_TARVAL: {
1077 assert(vals->kind != BITFIELD);
1078 vals->kind = TARVAL;
1080 vals->v.tarval = get_initializer_tarval_value(initializer);
1081 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
1082 for (i = 1; i < get_type_size_bytes(type); ++i) {
1083 vals[i].kind = NORMAL;
1084 vals[i].type = NULL;
1085 vals[i].v.value = NULL;
1089 case IR_INITIALIZER_CONST: {
1092 assert(vals->kind != BITFIELD);
1093 vals->kind = NORMAL;
1095 vals->v.value = get_initializer_const_value(initializer);
1096 for (i = 1; i < get_type_size_bytes(type); ++i) {
1097 vals[i].kind = NORMAL;
1098 vals[i].type = NULL;
1099 vals[i].v.value = NULL;
1103 case IR_INITIALIZER_COMPOUND: {
1105 size_t n = get_initializer_compound_n_entries(initializer);
1107 if (is_Array_type(type)) {
1108 ir_type *element_type = get_array_element_type(type);
1109 size_t skip = get_type_size_bytes(element_type);
1110 size_t alignment = get_type_alignment_bytes(element_type);
1111 size_t misalign = skip % alignment;
1112 if (misalign != 0) {
1113 skip += alignment - misalign;
1116 for (i = 0; i < n; ++i) {
1117 ir_initializer_t *sub_initializer
1118 = get_initializer_compound_value(initializer, i);
1120 emit_ir_initializer(vals, sub_initializer, element_type);
1125 size_t n_members, i;
1126 assert(is_compound_type(type));
1127 n_members = get_compound_n_members(type);
1128 for (i = 0; i < n_members; ++i) {
1129 ir_entity *member = get_compound_member(type, i);
1130 size_t offset = get_entity_offset(member);
1131 ir_type *subtype = get_entity_type(member);
1132 ir_mode *mode = get_type_mode(subtype);
1133 ir_initializer_t *sub_initializer;
1135 assert(i < get_initializer_compound_n_entries(initializer));
1137 = get_initializer_compound_value(initializer, i);
1141 = get_entity_offset_bits_remainder(member);
1143 if (is_Primitive_type(subtype)
1144 && get_primitive_base_type(subtype) != NULL) {
1145 emit_bitfield(&vals[offset], offset_bits,
1146 sub_initializer, subtype);
1149 assert(offset_bits == 0);
1153 emit_ir_initializer(&vals[offset], sub_initializer, subtype);
1160 panic("invalid ir_initializer kind found");
1163 static void emit_tarval_data(ir_type *type, ir_tarval *tv)
1165 size_t size = get_type_size_bytes(type);
1167 /* this should be an x86 extended float */
1168 assert(be_get_backend_param()->byte_order_big_endian == 0);
1170 /* Beware: Mixed endian output! One little endian number emitted as
1171 * three longs. Each long initializer is written in big endian. */
1173 "\t.long\t0x%02x%02x%02x%02x\n"
1174 "\t.long\t0x%02x%02x%02x%02x\n"
1175 "\t.long\t0x%02x%02x%02x%02x\n",
1176 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
1177 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0),
1178 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
1179 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
1180 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
1181 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8)
1183 be_emit_write_line();
1184 } else if (size == 16) {
1185 if (be_get_backend_param()->byte_order_big_endian) {
1187 "\t.long\t0x%02x%02x%02x%02x\n"
1188 "\t.long\t0x%02x%02x%02x%02x\n"
1189 "\t.long\t0x%02x%02x%02x%02x\n"
1190 "\t.long\t0x%02x%02x%02x%02x\n",
1191 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 14),
1192 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
1193 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
1194 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
1195 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
1196 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
1197 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
1198 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0)
1201 /* Beware: Mixed endian output! One little endian number emitted as
1202 * three longs. Each long initializer is written in big endian. */
1204 "\t.long\t0x%02x%02x%02x%02x\n"
1205 "\t.long\t0x%02x%02x%02x%02x\n"
1206 "\t.long\t0x%02x%02x%02x%02x\n"
1207 "\t.long\t0x%02x%02x%02x%02x\n",
1208 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
1209 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0),
1210 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
1211 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
1212 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
1213 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
1214 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 14),
1215 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12)
1218 be_emit_write_line();
1222 emit_size_type(size);
1223 emit_arith_tarval(tv, size);
1225 be_emit_write_line();
1230 * Emit an atomic value.
1232 * @param env the gas output environment
1233 * @param init a node representing the atomic value (on the const code irg)
1235 static void emit_node_data(be_gas_decl_env_t *env, ir_node *init, ir_type *type)
1237 size_t size = get_type_size_bytes(type);
1238 if (size == 12 || size == 16) {
1240 if (!is_Const(init)) {
1241 panic("12/16byte initializers only support Const nodes yet");
1243 tv = get_Const_tarval(init);
1244 emit_tarval_data(type, tv);
1248 emit_size_type(size);
1249 emit_init_expression(env, init);
1251 be_emit_write_line();
1254 static void emit_initializer(be_gas_decl_env_t *env, const ir_entity *entity)
1256 const ir_initializer_t *initializer = entity->initializer;
1258 normal_or_bitfield *vals;
1262 if (initializer_is_string_const(initializer)) {
1263 emit_string_initializer(initializer);
1267 type = get_entity_type(entity);
1268 size = get_initializer_size(initializer, type);
1274 * In the worst case, every initializer allocates one byte.
1275 * Moreover, initializer might be big, do not allocate on stack.
1277 vals = XMALLOCNZ(normal_or_bitfield, size);
1284 emit_ir_initializer(vals, initializer, type);
1286 /* now write values sorted */
1287 for (k = 0; k < size; ) {
1289 normal_or_bitfield_kind kind = vals[k].kind;
1293 if (vals[k].v.value != NULL) {
1294 emit_node_data(env, vals[k].v.value, vals[k].type);
1295 elem_size = get_type_size_bytes(vals[k].type);
1301 emit_tarval_data(vals[k].type, vals[k].v.tarval);
1302 elem_size = get_type_size_bytes(vals[k].type);
1305 elem_size = emit_string_initializer(vals[k].v.string);
1308 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1309 be_emit_write_line();
1313 panic("internal compiler error (invalid normal_or_bitfield_kind");
1317 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1324 be_emit_irprintf("\t.space\t%d, 0\n", space);
1325 be_emit_write_line();
1331 static void emit_compound_graph_init(be_gas_decl_env_t *env,
1332 const ir_entity *ent)
1334 normal_or_bitfield *vals;
1336 unsigned k, last_ofs;
1338 if (entity_is_string_const(ent)) {
1339 emit_string_cst(ent);
1343 n = get_compound_ent_n_values(ent);
1345 /* Find the initializer size. Sorrily gcc support a nasty feature:
1346 The last field of a compound may be a flexible array. This allows
1347 initializers bigger than the type size. */
1348 last_ofs = get_type_size_bytes(get_entity_type(ent));
1349 for (i = 0; i < n; ++i) {
1350 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1351 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1352 ir_node *value = get_compound_ent_value(ent, i);
1353 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1355 offset += (value_len + bits_remainder + 7) >> 3;
1357 if (offset > last_ofs) {
1363 * In the worst case, every initializer allocates one byte.
1364 * Moreover, initializer might be big, do not allocate on stack.
1366 vals = XMALLOCNZ(normal_or_bitfield, last_ofs);
1368 /* collect the values and store them at the offsets */
1369 for (i = 0; i < n; ++i) {
1370 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1371 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1372 ir_node *value = get_compound_ent_value(ent, i);
1373 int value_len = get_mode_size_bits(get_irn_mode(value));
1375 assert(offset_bits >= 0);
1377 if (offset_bits != 0 ||
1378 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1379 ir_tarval *tv = get_atomic_init_tv(value);
1380 unsigned char curr_bits, last_bits = 0;
1382 panic("Couldn't get numeric value for bitfield initializer '%s'",
1383 get_entity_ld_name(ent));
1385 /* normalize offset */
1386 offset += offset_bits >> 3;
1389 for (j = 0; value_len + offset_bits > 0; ++j) {
1390 assert(offset + j < last_ofs);
1391 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1392 vals[offset + j].kind = BITFIELD;
1393 curr_bits = get_tarval_sub_bits(tv, j);
1394 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1396 last_bits = curr_bits;
1401 assert(offset < last_ofs);
1402 assert(vals[offset].kind == NORMAL);
1403 for (i = 1; i < value_len / 8; ++i) {
1404 assert(vals[offset + i].v.value == NULL);
1406 vals[offset].v.value = value;
1410 /* now write them sorted */
1411 for (k = 0; k < last_ofs; ) {
1412 int space = 0, skip = 0;
1413 if (vals[k].kind == NORMAL) {
1414 if (vals[k].v.value != NULL) {
1415 emit_node_data(env, vals[k].v.value, vals[k].type);
1416 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1421 assert(vals[k].kind == BITFIELD);
1422 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1426 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1435 be_emit_irprintf("\t.space\t%d, 0\n", space);
1436 be_emit_write_line();
1442 static void emit_align(unsigned p2alignment)
1444 be_emit_irprintf("\t.p2align\t%u\n", log2_floor(p2alignment));
1445 be_emit_write_line();
1448 static unsigned get_effective_entity_alignment(const ir_entity *entity)
1450 unsigned alignment = get_entity_alignment(entity);
1451 if (alignment == 0) {
1452 ir_type *type = get_entity_type(entity);
1453 alignment = get_type_alignment_bytes(type);
1458 static void emit_common(const ir_entity *entity)
1460 unsigned size = get_type_size_bytes(get_entity_type(entity));
1461 unsigned alignment = get_effective_entity_alignment(entity);
1463 if (get_entity_linkage(entity) & IR_LINKAGE_WEAK) {
1467 switch (be_gas_object_file_format) {
1468 case OBJECT_FILE_FORMAT_MACH_O:
1469 be_emit_cstring("\t.comm ");
1470 be_gas_emit_entity(entity);
1471 be_emit_irprintf(",%u,%u\n", size, log2_floor(alignment));
1472 be_emit_write_line();
1474 case OBJECT_FILE_FORMAT_ELF:
1475 be_emit_cstring("\t.comm ");
1476 be_gas_emit_entity(entity);
1477 be_emit_irprintf(",%u,%u\n", size, alignment);
1478 be_emit_write_line();
1480 case OBJECT_FILE_FORMAT_COFF:
1481 be_emit_cstring("\t.comm ");
1482 be_gas_emit_entity(entity);
1483 be_emit_irprintf(",%u # %u\n", size, alignment);
1484 be_emit_write_line();
1487 panic("invalid object file format");
1490 static void emit_local_common(const ir_entity *entity)
1492 unsigned size = get_type_size_bytes(get_entity_type(entity));
1493 unsigned alignment = get_effective_entity_alignment(entity);
1495 if (get_entity_linkage(entity) & IR_LINKAGE_WEAK) {
1499 switch (be_gas_object_file_format) {
1500 case OBJECT_FILE_FORMAT_MACH_O:
1501 be_emit_cstring("\t.lcomm ");
1502 be_gas_emit_entity(entity);
1503 be_emit_irprintf(",%u,%u\n", size, log2_floor(alignment));
1504 be_emit_write_line();
1506 case OBJECT_FILE_FORMAT_ELF:
1507 be_emit_cstring("\t.local ");
1508 be_gas_emit_entity(entity);
1509 be_emit_cstring("\n");
1510 be_emit_write_line();
1511 be_emit_cstring("\t.comm ");
1512 be_gas_emit_entity(entity);
1513 be_emit_irprintf(",%u,%u\n", size, alignment);
1514 be_emit_write_line();
1516 case OBJECT_FILE_FORMAT_COFF:
1517 be_emit_cstring("\t.lcomm ");
1518 be_gas_emit_entity(entity);
1519 be_emit_irprintf(",%u # %u\n", size, alignment);
1520 be_emit_write_line();
1523 panic("invalid object file format");
1526 static void emit_indirect_symbol(const ir_entity *entity, be_gas_section_t section)
1528 /* we can only do PIC code on macho so far */
1529 assert(be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O);
1531 be_gas_emit_entity(entity);
1532 be_emit_cstring(":\n");
1533 be_emit_write_line();
1534 be_emit_cstring("\t.indirect_symbol ");
1535 be_emit_ident(get_entity_ident(entity));
1537 be_emit_write_line();
1538 if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1539 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1540 be_emit_write_line();
1542 assert(section == GAS_SECTION_PIC_SYMBOLS);
1543 be_emit_cstring("\t.long 0\n");
1544 be_emit_write_line();
1548 char const *be_gas_get_private_prefix(void)
1550 return be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O ? "L" : ".L";
1553 void be_gas_emit_entity(const ir_entity *entity)
1555 if (entity->type == get_code_type()) {
1556 ir_label_t label = get_entity_label(entity);
1557 be_emit_irprintf("%s_%lu", be_gas_get_private_prefix(), label);
1561 if (get_entity_visibility(entity) == ir_visibility_private) {
1562 be_emit_string(be_gas_get_private_prefix());
1564 be_emit_ident(get_entity_ld_ident(entity));
1567 void be_gas_emit_block_name(const ir_node *block)
1569 ir_entity *entity = get_Block_entity(block);
1570 if (entity != NULL) {
1571 be_gas_emit_entity(entity);
1573 be_emit_irprintf("%s%ld", be_gas_get_private_prefix(), get_irn_node_nr(block));
1578 * Dump a global entity.
1580 * @param env the gas output environment
1581 * @param ent the entity to be dumped
1583 static void emit_global(be_gas_decl_env_t *env, const ir_entity *entity)
1585 ir_type *type = get_entity_type(entity);
1586 ident *ld_ident = get_entity_ld_ident(entity);
1587 unsigned alignment = get_effective_entity_alignment(entity);
1588 be_gas_section_t section = determine_section(env, entity);
1589 ir_visibility visibility = get_entity_visibility(entity);
1590 ir_linkage linkage = get_entity_linkage(entity);
1592 /* block labels are already emittet in the code */
1593 if (type == get_code_type())
1596 /* we already emitted all methods. Except for the trampolines which
1597 * the assembler/linker generates */
1598 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1599 /* functions with graph are already emitted with
1600 * be_gas_emit_function_prolog */
1601 if (get_entity_irg(entity) == NULL) {
1602 emit_visibility(entity);
1607 be_dwarf_variable(entity);
1609 if (section == GAS_SECTION_BSS) {
1610 switch (visibility) {
1611 case ir_visibility_local:
1612 case ir_visibility_private:
1613 emit_local_common(entity);
1615 case ir_visibility_default:
1616 if (linkage & IR_LINKAGE_MERGE) {
1617 emit_common(entity);
1621 case ir_visibility_external:
1622 if (linkage & IR_LINKAGE_MERGE)
1623 panic("merge link semantic not supported for extern entities");
1628 emit_visibility(entity);
1629 if (visibility == ir_visibility_external) {
1630 /* nothing to do for externally defined values */
1634 if (!is_po2(alignment))
1635 panic("alignment not a power of 2");
1637 emit_section(section, entity);
1639 if (section == GAS_SECTION_PIC_TRAMPOLINES
1640 || section == GAS_SECTION_PIC_SYMBOLS) {
1641 emit_indirect_symbol(entity, section);
1646 if (alignment > 1) {
1647 emit_align(alignment);
1649 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_ELF
1650 && be_gas_emit_types
1651 && visibility != ir_visibility_private) {
1652 be_emit_cstring("\t.type\t");
1653 be_gas_emit_entity(entity);
1654 be_emit_cstring(", ");
1655 be_emit_char(be_gas_elf_type_char);
1656 be_emit_cstring("object\n\t.size\t");\
1657 be_gas_emit_entity(entity);
1658 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1661 if (get_id_str(ld_ident)[0] != '\0') {
1662 be_gas_emit_entity(entity);
1663 be_emit_cstring(":\n");
1664 be_emit_write_line();
1667 if (entity_is_null(entity)) {
1668 unsigned size = get_type_size_bytes(type);
1670 be_emit_irprintf("\t.space %u, 0\n", get_type_size_bytes(type));
1671 be_emit_write_line();
1673 } else if (entity_has_compound_ent_values(entity)) {
1674 emit_compound_graph_init(env, entity);
1676 assert(entity->initializer != NULL);
1677 emit_initializer(env, entity);
1682 * Dumps declarations of global variables and the initialization code.
1684 * @param gt a global like type, either the global or the TLS one
1685 * @param env an environment
1687 static void be_gas_emit_globals(ir_type *gt, be_gas_decl_env_t *env)
1689 size_t i, n = get_compound_n_members(gt);
1691 for (i = 0; i < n; i++) {
1692 ir_entity *ent = get_compound_member(gt, i);
1693 emit_global(env, ent);
1697 /* Generate all entities. */
1698 static void emit_global_decls(const be_main_env_t *main_env)
1700 be_gas_decl_env_t env;
1701 memset(&env, 0, sizeof(env));
1703 /* dump global type */
1704 env.main_env = main_env;
1705 env.section = (be_gas_section_t) -1;
1707 be_gas_emit_globals(get_glob_type(), &env);
1708 be_gas_emit_globals(get_tls_type(), &env);
1709 be_gas_emit_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env);
1710 be_gas_emit_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env);
1711 be_gas_emit_globals(main_env->pic_symbols_type, &env);
1712 be_gas_emit_globals(main_env->pic_trampolines_type, &env);
1715 * ".subsections_via_symbols marks object files which are OK to divide
1716 * their section contents into individual blocks".
1717 * From my understanding this means no label points in the middle of an
1718 * object which we want to address as a whole. Firm code should be fine
1721 if (be_gas_object_file_format == OBJECT_FILE_FORMAT_MACH_O) {
1722 be_emit_cstring("\t.subsections_via_symbols\n");
1723 be_emit_write_line();
1727 void be_emit_jump_table(const ir_node *node, const ir_switch_table *table,
1728 ir_entity *entity, get_cfop_target_func get_cfop_target)
1730 unsigned n_outs = arch_get_irn_n_outs(node);
1731 const ir_node **targets = XMALLOCNZ(const ir_node*, n_outs);
1732 size_t n_entries = ir_switch_table_get_n_entries(table);
1733 unsigned long length = 0;
1735 const ir_edge_t *edge;
1737 const ir_node **labels;
1739 /* go over all proj's and collect their jump targets */
1740 foreach_out_edge(node, edge) {
1741 ir_node *proj = get_edge_src_irn(edge);
1742 long pn = get_Proj_proj(proj);
1743 ir_node *target = get_cfop_target(proj);
1744 assert(targets[pn] == NULL);
1745 targets[pn] = target;
1748 /* go over table to determine max value (note that we normalized the
1749 * ranges so that the minimum is 0) */
1750 for (e = 0; e < n_entries; ++e) {
1751 const ir_switch_table_entry *entry
1752 = ir_switch_table_get_entry_const(table, e);
1753 ir_tarval *max = entry->max;
1757 if (!tarval_is_long(max))
1758 panic("switch case overflow (%+F)", node);
1759 val = (unsigned long) get_tarval_long(max);
1765 /* the 16000 isn't a real limit of the architecture. But should protect us
1766 * from seamingly endless compiler runs */
1767 if (length > 16000) {
1768 /* switch lowerer should have broken this monster to pieces... */
1769 panic("too large switch encountered (%+F)", node);
1773 labels = XMALLOCNZ(const ir_node*, length);
1774 for (e = 0; e < n_entries; ++e) {
1775 const ir_switch_table_entry *entry
1776 = ir_switch_table_get_entry_const(table, e);
1777 ir_tarval *min = entry->min;
1778 ir_tarval *max = entry->max;
1779 const ir_node *target = targets[entry->pn];
1780 assert(entry->pn < (long)n_outs);
1782 unsigned long val = (unsigned long)get_tarval_long(max);
1783 labels[val] = target;
1785 unsigned long min_val;
1786 unsigned long max_val;
1788 if (!tarval_is_long(min))
1789 panic("switch case overflow (%+F)", node);
1790 min_val = (unsigned long)get_tarval_long(min);
1791 max_val = (unsigned long)get_tarval_long(max);
1792 assert(min_val <= max_val);
1793 for (i = min_val; i <= max_val; ++i) {
1800 if (entity != NULL) {
1801 be_gas_emit_switch_section(GAS_SECTION_RODATA);
1802 be_emit_cstring("\t.align 4\n");
1803 be_gas_emit_entity(entity);
1804 be_emit_cstring(":\n");
1807 for (i = 0; i < length; ++i) {
1808 const ir_node *block = labels[i];
1811 be_emit_cstring("\t.long ");
1812 be_gas_emit_block_name(block);
1814 be_emit_write_line();
1818 be_gas_emit_switch_section(GAS_SECTION_TEXT);
1824 static void emit_global_asms(void)
1826 size_t n = get_irp_n_asms();
1829 be_gas_emit_switch_section(GAS_SECTION_TEXT);
1830 for (i = 0; i < n; ++i) {
1831 ident *asmtext = get_irp_asm(i);
1833 be_emit_cstring("#APP\n");
1834 be_emit_write_line();
1835 be_emit_ident(asmtext);
1837 be_emit_write_line();
1838 be_emit_cstring("#NO_APP\n");
1839 be_emit_write_line();
1843 void be_gas_begin_compilation_unit(const be_main_env_t *env)
1846 be_dwarf_unit_begin(env->cup_name);
1851 void be_gas_end_compilation_unit(const be_main_env_t *env)
1853 emit_global_decls(env);
1855 be_dwarf_unit_end();