2 * Copyright (C) 1995-2008 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
47 #include "beemitter.h"
48 #include "be_dbgout.h"
50 /** by default, we generate assembler code for the Linux gas */
51 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_ELF;
53 static be_gas_section_t current_section = (be_gas_section_t) -1;
56 * Return the pseudo-instruction to be issued for a section switch
57 * depending on the current flavour.
59 * @param section the section to switch to
61 * @return the pseudo-instruction
63 static const char *get_section_name(be_gas_section_t section) {
64 static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
65 { /* GAS_FLAVOUR_ELF */
70 ".section\t.tbss,\"awT\",@nobits",
71 ".section\t.ctors,\"aw\",@progbits",
72 NULL, /* no cstring section */
76 { /* GAS_FLAVOUR_MINGW */
79 ".section .rdata,\"dr\"",
81 ".section\t.tbss,\"awT\",@nobits",
82 ".section\t.ctors,\"aw\",@progbits",
87 { /* GAS_FLAVOUR_YASM */
92 ".section\t.tbss,\"awT\",@nobits",
93 ".section\t.ctors,\"aw\",@progbits",
98 { /* GAS_FLAVOUR_MACH_O */
103 NULL, /* TLS is not supported on Mach-O */
106 ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
107 ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
111 assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
112 assert((int) section >= 0 && section <= GAS_SECTION_LAST);
113 return text[be_gas_flavour][section];
116 void be_gas_emit_switch_section(be_gas_section_t section) {
117 if(current_section == section)
121 be_emit_string(get_section_name(section));
123 be_emit_write_line();
124 current_section = section;
127 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
129 const char *name = get_entity_ld_name(entity);
130 const char *fill_byte = "";
131 unsigned maximum_skip;
133 be_gas_emit_switch_section(GAS_SECTION_TEXT);
135 /* write the begin line (used by scripts processing the assembler... */
136 be_emit_write_line();
137 be_emit_cstring("# -- Begin ");
138 be_emit_string(name);
140 be_emit_write_line();
142 /* gcc fills space between function with 0x90, no idea if this is needed */
143 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
148 maximum_skip = (1 << alignment) - 1;
149 be_emit_cstring("\t.p2align ");
150 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
151 be_emit_write_line();
153 if (get_entity_visibility(entity) == visibility_external_visible) {
154 be_emit_cstring(".globl ");
155 be_emit_string(name);
157 be_emit_write_line();
160 switch (be_gas_flavour) {
161 case GAS_FLAVOUR_ELF:
162 be_emit_cstring("\t.type\t");
163 be_emit_string(name);
164 be_emit_cstring(", @function\n");
165 be_emit_write_line();
167 case GAS_FLAVOUR_MINGW:
168 be_emit_cstring("\t.def\t");
169 be_emit_string(name);
170 be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
171 be_emit_write_line();
173 case GAS_FLAVOUR_MACH_O:
174 case GAS_FLAVOUR_YASM:
177 be_emit_string(name);
178 be_emit_cstring(":\n");
179 be_emit_write_line();
182 void be_gas_emit_function_epilog(ir_entity *entity)
184 const char *name = get_entity_ld_name(entity);
186 if (be_gas_flavour == GAS_FLAVOUR_ELF) {
187 be_emit_cstring("\t.size\t");
188 be_emit_string(name);
189 be_emit_cstring(", .-");
190 be_emit_string(name);
192 be_emit_write_line();
195 be_emit_cstring("# -- End ");
196 be_emit_string(name);
198 be_emit_write_line();
202 * An environment containing all needed dumper data.
203 * Currently we create the file completely in memory first, then
204 * write it to the disk. This is an artifact from the old C-generating backend
205 * and even there NOT needed. So we might change it in the future.
207 typedef struct _be_gas_decl_env {
208 const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
209 be_gas_section_t section;
210 waitq *worklist; /**< A worklist we use to place not yet handled entities on. */
213 /************************************************************************/
218 * @param tv the tarval
219 * @param bytes the width of the tarvals value in bytes
221 static void dump_arith_tarval(tarval *tv, int bytes)
225 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
229 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
233 be_emit_irprintf("0x%02x%02x%02x%02x",
234 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
238 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
239 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
240 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
244 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
245 "%02x%02x%02x%02x", get_tarval_sub_bits(tv, 11),
246 get_tarval_sub_bits(tv, 10), get_tarval_sub_bits(tv, 9),
247 get_tarval_sub_bits(tv, 8), get_tarval_sub_bits(tv, 7),
248 get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5),
249 get_tarval_sub_bits(tv, 4), get_tarval_sub_bits(tv, 3),
250 get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1),
251 get_tarval_sub_bits(tv, 0));
255 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
256 "%02x%02x%02x%02x%02x%02x%02x%02x",
257 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
258 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
259 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
260 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
261 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
262 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
263 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
264 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
268 panic("Can't dump a tarval with %d bytes\n", bytes);
272 * Return the label prefix for labeled blocks.
274 const char *be_gas_label_prefix(void) {
281 static void dump_label(ir_label_t label) {
282 be_emit_irprintf("%s%ld", be_gas_label_prefix(), label);
286 * Return the tarval of an atomic initializer.
288 * @param init a node representing the initializer (on the const code irg)
292 static tarval *get_atomic_init_tv(ir_node *init)
295 ir_mode *mode = get_irn_mode(init);
297 switch (get_irn_opcode(init)) {
300 init = get_Cast_op(init);
304 init = get_Conv_op(init);
308 return get_Const_tarval(init);
311 switch (get_SymConst_kind(init)) {
312 case symconst_type_size:
313 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
315 case symconst_type_align:
316 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
318 case symconst_ofs_ent:
319 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
321 case symconst_enum_const:
322 return get_enumeration_value(get_SymConst_enum(init));
338 * Dump an atomic value.
340 * @param env the gas output environment
341 * @param init a node representing the atomic value (on the const code irg)
343 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
345 ir_mode *mode = get_irn_mode(init);
346 int bytes = get_mode_size_bytes(mode);
351 init = skip_Id(init);
353 switch (get_irn_opcode(init)) {
355 do_dump_atomic_init(env, get_Cast_op(init));
359 do_dump_atomic_init(env, get_Conv_op(init));
363 tv = get_Const_tarval(init);
365 /* it's a arithmetic value */
366 dump_arith_tarval(tv, bytes);
370 switch (get_SymConst_kind(init)) {
371 case symconst_addr_name:
372 be_emit_ident(get_SymConst_name(init));
375 case symconst_addr_ent:
376 ent = get_SymConst_entity(init);
377 if(!is_entity_backend_marked(ent)) {
378 waitq_put(env->worklist, ent);
379 set_entity_backend_marked(ent, 1);
381 be_emit_ident(get_entity_ld_ident(ent));
384 case symconst_ofs_ent:
385 ent = get_SymConst_entity(init);
386 #if 0 /* not needed, is it? */
387 if(!is_entity_backend_marked(ent)) {
388 waitq_put(env->worklist, ent);
389 set_entity_backend_marked(ent, 1);
392 be_emit_irprintf("%d", get_entity_offset(ent));
395 case symconst_type_size:
396 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
399 case symconst_type_align:
400 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
403 case symconst_enum_const:
404 tv = get_enumeration_value(get_SymConst_enum(init));
405 dump_arith_tarval(tv, bytes);
409 label = get_SymConst_label(init);
414 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
419 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
420 panic("Constant must be int or pointer for '+' to work");
422 do_dump_atomic_init(env, get_Add_left(init));
423 be_emit_cstring(" + ");
424 do_dump_atomic_init(env, get_Add_right(init));
428 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
429 panic("Constant must be int or pointer for '-' to work");
431 do_dump_atomic_init(env, get_Sub_left(init));
432 be_emit_cstring(" - ");
433 do_dump_atomic_init(env, get_Sub_right(init));
437 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
438 panic("Constant must be int or pointer for '*' to work");
440 do_dump_atomic_init(env, get_Mul_left(init));
441 be_emit_cstring(" * ");
442 do_dump_atomic_init(env, get_Mul_right(init));
446 assert(0 && "dump_atomic_init(): unknown IR-node");
451 * Dumps the type for given size (.byte, .long, ...)
453 * @param size the size in bytes
455 static void dump_size_type(size_t size) {
458 be_emit_cstring("\t.byte\t");
462 be_emit_cstring("\t.word\t");
466 be_emit_cstring("\t.long\t");
470 be_emit_cstring("\t.quad\t");
475 /* handled in arith */
479 be_emit_cstring("\t.octa\t");
483 panic("Try to dump a type with %u bytes\n", (unsigned) size);
488 * Emit an atomic value.
490 * @param env the gas output environment
491 * @param init a node representing the atomic value (on the const code irg)
493 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
495 ir_mode *mode = get_irn_mode(init);
496 int bytes = get_mode_size_bytes(mode);
498 dump_size_type(bytes);
499 do_dump_atomic_init(env, init);
501 be_emit_write_line();
504 /************************************************************************/
505 /* Routines to dump global variables */
506 /************************************************************************/
508 static int initializer_is_string_const(const ir_initializer_t *initializer)
511 int found_printable = 0;
513 if(initializer->kind != IR_INITIALIZER_COMPOUND)
516 len = initializer->compound.n_initializers;
519 for(i = 0; i < len; ++i) {
523 ir_initializer_t *sub_initializer
524 = initializer->compound.initializers[i];
526 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
529 tv = sub_initializer->tarval.value;
530 mode = get_tarval_mode(tv);
532 if (!mode_is_int(mode)
533 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
536 c = get_tarval_long(tv);
537 if (isgraph(c) || isspace(c))
542 if (i == len - 1 && c != '\0')
546 return found_printable;
550 * Determine if an entity is a string constant
551 * @param ent The entity
552 * @return 1 if it is a string constant, 0 otherwise
554 static int ent_is_string_const(ir_entity *ent)
556 ir_type *type, *element_type;
559 int found_printable = 0;
561 type = get_entity_type(ent);
563 /* if it's an array */
564 if (!is_Array_type(type))
567 element_type = get_array_element_type(type);
569 /* and the array's element type is primitive */
570 if (!is_Primitive_type(element_type))
573 /* and the mode of the element type is an int of
574 * the same size as the byte mode */
575 mode = get_type_mode(element_type);
576 if (!mode_is_int(mode)
577 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
580 if(ent->has_initializer) {
584 /* if it contains only printable chars and a 0 at the end */
585 n = get_compound_ent_n_values(ent);
586 for (i = 0; i < n; ++i) {
587 ir_node *irn = get_compound_ent_value(ent, i);
591 c = (int) get_tarval_long(get_Const_tarval(irn));
593 if (isgraph(c) || isspace(c))
598 if (i == n - 1 && c != '\0')
603 /* then we can emit it as a string constant */
604 return found_printable;
608 * Dump a string constant.
609 * No checks are made!!
611 * @param ent The entity to dump.
613 static void dump_string_cst(ir_entity *ent)
620 len = get_compound_ent_n_values(ent);
621 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
622 be_emit_cstring("\t.ascii \"");
624 be_emit_cstring("\t.string \"");
628 for (i = 0; i < len; ++i) {
632 irn = get_compound_ent_value(ent, i);
633 c = (int) get_tarval_long(get_Const_tarval(irn));
636 case '"' : be_emit_cstring("\\\""); break;
637 case '\n': be_emit_cstring("\\n"); break;
638 case '\r': be_emit_cstring("\\r"); break;
639 case '\t': be_emit_cstring("\\t"); break;
640 case '\\': be_emit_cstring("\\\\"); break;
645 be_emit_irprintf("\\%o", c);
649 be_emit_cstring("\"\n");
650 be_emit_write_line();
652 type = get_entity_type(ent);
653 type_size = get_type_size_bytes(type);
654 remaining_space = type_size - len;
655 assert(remaining_space >= 0);
656 if(remaining_space > 0) {
657 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
661 static void dump_string_initializer(const ir_initializer_t *initializer)
665 len = initializer->compound.n_initializers;
666 if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
667 be_emit_cstring("\t.ascii \"");
669 be_emit_cstring("\t.string \"");
673 for(i = 0; i < len; ++i) {
674 const ir_initializer_t *sub_initializer
675 = get_initializer_compound_value(initializer, i);
677 tarval *tv = get_initializer_tarval_value(sub_initializer);
678 int c = get_tarval_long(tv);
681 case '"' : be_emit_cstring("\\\""); break;
682 case '\n': be_emit_cstring("\\n"); break;
683 case '\r': be_emit_cstring("\\r"); break;
684 case '\t': be_emit_cstring("\\t"); break;
685 case '\\': be_emit_cstring("\\\\"); break;
690 be_emit_irprintf("\\%o", c);
694 be_emit_cstring("\"\n");
695 be_emit_write_line();
698 enum normal_or_bitfield_kind {
705 enum normal_or_bitfield_kind kind;
709 unsigned char bf_val;
711 } normal_or_bitfield;
713 static int is_type_variable_size(ir_type *type)
720 static size_t get_initializer_size(const ir_initializer_t *initializer,
723 switch(get_initializer_kind(initializer)) {
724 case IR_INITIALIZER_TARVAL: {
725 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
726 return get_type_size_bytes(type);
728 case IR_INITIALIZER_CONST:
729 case IR_INITIALIZER_NULL:
730 return get_type_size_bytes(type);
731 case IR_INITIALIZER_COMPOUND: {
732 if(!is_type_variable_size(type)) {
733 return get_type_size_bytes(type);
736 = get_initializer_compound_n_entries(initializer);
738 unsigned initializer_size = get_type_size_bytes(type);
739 for(i = 0; i < n_entries; ++i) {
740 ir_entity *entity = get_compound_member(type, i);
741 ir_type *type = get_entity_type(entity);
743 const ir_initializer_t *sub_initializer
744 = get_initializer_compound_value(initializer, i);
746 unsigned offset = get_entity_offset(entity);
747 unsigned size = get_initializer_size(sub_initializer, type);
749 if(offset + size > initializer_size) {
750 initializer_size = offset + size;
753 return initializer_size;
758 panic("found invalid initializer");
762 static normal_or_bitfield *glob_vals;
763 static size_t max_vals;
766 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
767 const ir_initializer_t *initializer, ir_type *type)
769 unsigned char last_bits = 0;
770 ir_mode *mode = get_type_mode(type);
772 unsigned char curr_bits;
776 switch(get_initializer_kind(initializer)) {
777 case IR_INITIALIZER_NULL:
779 case IR_INITIALIZER_TARVAL:
780 tv = get_initializer_tarval_value(initializer);
782 case IR_INITIALIZER_CONST: {
783 ir_node *node = get_initializer_const_value(initializer);
784 if(!is_Const(node)) {
785 panic("bitfield initializer not a Const node");
787 tv = get_Const_tarval(node);
790 case IR_INITIALIZER_COMPOUND:
791 panic("bitfield initializer is compound");
794 panic("Couldn't get numeric value for bitfield initializer\n");
797 /* normalize offset */
798 vals += offset_bits >> 3;
800 value_len = get_mode_size_bits(mode);
802 /* combine bits with existing bits */
803 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
804 assert((size_t) (vals - glob_vals) + j < max_vals);
805 assert(vals[j].kind == BITFIELD ||
806 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
807 vals[j].kind = BITFIELD;
808 curr_bits = get_tarval_sub_bits(tv, j);
810 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
812 last_bits = curr_bits;
816 static void dump_ir_initializer(normal_or_bitfield *vals,
817 const ir_initializer_t *initializer,
820 assert((size_t) (vals - glob_vals) < max_vals);
822 switch(get_initializer_kind(initializer)) {
823 case IR_INITIALIZER_NULL:
825 case IR_INITIALIZER_TARVAL: {
828 assert(vals->kind != BITFIELD);
830 vals->v.tarval = get_initializer_tarval_value(initializer);
831 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
832 for(i = 1; i < get_type_size_bytes(type); ++i) {
833 vals[i].kind = NORMAL;
834 vals[i].v.value = NULL;
838 case IR_INITIALIZER_CONST: {
841 assert(vals->kind != BITFIELD);
843 vals->v.value = get_initializer_const_value(initializer);
844 for(i = 1; i < get_type_size_bytes(type); ++i) {
845 vals[i].kind = NORMAL;
846 vals[i].v.value = NULL;
850 case IR_INITIALIZER_COMPOUND: {
852 size_t n = get_initializer_compound_n_entries(initializer);
854 if(is_Array_type(type)) {
855 ir_type *element_type = get_array_element_type(type);
856 size_t skip = get_type_size_bytes(element_type);
857 size_t alignment = get_type_alignment_bytes(element_type);
858 size_t misalign = skip % alignment;
860 skip += alignment - misalign;
863 for(i = 0; i < n; ++i) {
864 ir_initializer_t *sub_initializer
865 = get_initializer_compound_value(initializer, i);
867 dump_ir_initializer(vals, sub_initializer, element_type);
873 assert(is_compound_type(type));
874 n_members = get_compound_n_members(type);
875 for(i = 0; i < n_members; ++i) {
876 ir_entity *member = get_compound_member(type, i);
877 size_t offset = get_entity_offset(member);
878 ir_type *subtype = get_entity_type(member);
879 ir_mode *mode = get_type_mode(subtype);
880 ir_initializer_t *sub_initializer;
882 assert(i < get_initializer_compound_n_entries(initializer));
884 = get_initializer_compound_value(initializer, i);
888 = get_entity_offset_bits_remainder(member);
889 size_t value_len = get_mode_size_bits(mode);
891 if(offset_bits != 0 ||
892 (value_len != 8 && value_len != 16 && value_len != 32
893 && value_len != 64)) {
894 dump_bitfield(&vals[offset], offset_bits,
895 sub_initializer, subtype);
900 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
907 panic("invalid ir_initializer kind found");
910 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
912 const ir_initializer_t *initializer = entity->attr.initializer;
914 normal_or_bitfield *vals;
918 if(initializer_is_string_const(initializer)) {
919 dump_string_initializer(initializer);
923 type = get_entity_type(entity);
924 size = get_initializer_size(initializer, type);
930 * In the worst case, every initializer allocates one byte.
931 * Moreover, initializer might be big, do not allocate on stack.
933 vals = xcalloc(size, sizeof(vals[0]));
940 dump_ir_initializer(vals, initializer, type);
942 /* now write values sorted */
943 for (k = 0; k < size; ) {
946 if (vals[k].kind == NORMAL) {
947 if(vals[k].v.value != NULL) {
948 dump_atomic_init(env, vals[k].v.value);
949 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
953 } else if(vals[k].kind == TARVAL) {
954 tarval *tv = vals[k].v.tarval;
955 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
960 dump_size_type(size);
961 dump_arith_tarval(tv, size);
963 be_emit_write_line();
965 assert(vals[k].kind == BITFIELD);
966 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
967 be_emit_write_line();
971 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
978 be_emit_irprintf("\t.skip\t%d\n", space);
979 be_emit_write_line();
986 * Dump an initializer for a compound entity.
988 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
990 normal_or_bitfield *vals;
992 unsigned k, last_ofs;
994 if(ent->has_initializer) {
995 dump_initializer(env, ent);
999 n = get_compound_ent_n_values(ent);
1001 /* Find the initializer size. Sorrily gcc support a nasty feature:
1002 The last field of a compound may be a flexible array. This allows
1003 initializers bigger than the type size. */
1004 last_ofs = get_type_size_bytes(get_entity_type(ent));
1005 for (i = 0; i < n; ++i) {
1006 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1007 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1008 ir_node *value = get_compound_ent_value(ent, i);
1009 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1011 offset += (value_len + bits_remainder + 7) >> 3;
1013 if (offset > last_ofs) {
1019 * In the worst case, every initializer allocates one byte.
1020 * Moreover, initializer might be big, do not allocate on stack.
1022 vals = xcalloc(last_ofs, sizeof(vals[0]));
1024 /* collect the values and store them at the offsets */
1025 for (i = 0; i < n; ++i) {
1026 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1027 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1028 ir_node *value = get_compound_ent_value(ent, i);
1029 int value_len = get_mode_size_bits(get_irn_mode(value));
1031 assert(offset_bits >= 0);
1033 if (offset_bits != 0 ||
1034 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1035 tarval *tv = get_atomic_init_tv(value);
1036 unsigned char curr_bits, last_bits = 0;
1038 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
1039 get_entity_ld_name(ent));
1041 /* normalize offset */
1042 offset += offset_bits >> 3;
1045 for (j = 0; value_len + offset_bits > 0; ++j) {
1046 assert(offset + j < last_ofs);
1047 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1048 vals[offset + j].kind = BITFIELD;
1049 curr_bits = get_tarval_sub_bits(tv, j);
1050 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1052 last_bits = curr_bits;
1057 assert(offset < last_ofs);
1058 assert(vals[offset].kind == NORMAL);
1059 for (i = 1; i < value_len / 8; ++i) {
1060 assert(vals[offset + i].v.value == NULL);
1062 vals[offset].v.value = value;
1066 /* now write them sorted */
1067 for (k = 0; k < last_ofs; ) {
1068 int space = 0, skip = 0;
1069 if (vals[k].kind == NORMAL) {
1070 if(vals[k].v.value != NULL) {
1071 dump_atomic_init(env, vals[k].v.value);
1072 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1077 assert(vals[k].kind == BITFIELD);
1078 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1082 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1091 be_emit_irprintf("\t.skip\t%d\n", space);
1092 be_emit_write_line();
1098 static void emit_align(unsigned alignment)
1100 if (!is_po2(alignment))
1101 panic("alignment not a power of 2");
1103 be_emit_irprintf(".p2align\t%u\n", log2_floor(alignment));
1104 be_emit_write_line();
1108 * Dump a global entity.
1110 * @param env the gas output environment
1111 * @param ent the entity to be dumped
1113 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1115 ir_type *type = get_entity_type(ent);
1116 ident *ld_ident = get_entity_ld_ident(ent);
1117 unsigned align = get_type_alignment_bytes(type);
1118 int emit_as_common = 0;
1119 be_gas_section_t section = env->section;
1120 ir_variability variability = get_entity_variability(ent);
1121 ir_visibility visibility = get_entity_visibility(ent);
1123 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1127 if (section != (be_gas_section_t) -1) {
1129 } else if (variability == variability_constant) {
1130 /* a constant entity, put it on the rdata */
1131 section = GAS_SECTION_RODATA;
1132 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1133 && ent_is_string_const(ent)) {
1134 section = GAS_SECTION_CSTRING;
1136 } else if (variability == variability_uninitialized) {
1137 /* uninitialized entity put it in bss segment */
1138 section = GAS_SECTION_COMMON;
1139 if (visibility != visibility_local)
1142 section = GAS_SECTION_DATA;
1145 if(!emit_as_common) {
1146 be_gas_emit_switch_section(section);
1149 be_dbg_variable(ent);
1151 /* global or not global */
1152 if (visibility == visibility_external_visible && !emit_as_common) {
1153 be_emit_cstring(".globl\t");
1154 be_emit_ident(ld_ident);
1156 be_emit_write_line();
1157 } else if(visibility == visibility_external_allocated) {
1158 be_emit_cstring(".globl\t");
1159 be_emit_ident(ld_ident);
1161 be_emit_write_line();
1162 /* we can return now... */
1166 if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1167 && section != GAS_SECTION_PIC_SYMBOLS) {
1171 if (!emit_as_common) {
1172 be_emit_ident(ld_ident);
1173 be_emit_cstring(":\n");
1174 be_emit_write_line();
1177 if (variability == variability_uninitialized) {
1178 if (emit_as_common) {
1179 switch (be_gas_flavour) {
1180 case GAS_FLAVOUR_ELF:
1181 case GAS_FLAVOUR_MACH_O:
1182 case GAS_FLAVOUR_YASM:
1183 be_emit_irprintf("\t.comm %s,%u,%u\n",
1184 get_id_str(ld_ident), get_type_size_bytes(type), align);
1185 be_emit_write_line();
1187 case GAS_FLAVOUR_MINGW:
1188 be_emit_irprintf("\t.comm %s,%u # %u\n",
1189 get_id_str(ld_ident), get_type_size_bytes(type), align);
1190 be_emit_write_line();
1193 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1194 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1195 be_emit_cstring("\t.indirect_symbol ");
1196 be_emit_ident(get_entity_ident(ent));
1198 be_emit_write_line();
1199 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1200 be_emit_write_line();
1202 panic("PIC trampolines not yet supported in this gas mode");
1205 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1206 be_emit_write_line();
1209 if (is_atomic_entity(ent)) {
1210 dump_atomic_init(env, get_atomic_ent_value(ent));
1212 /* sort_compound_ent_values(ent); */
1214 switch (get_type_tpop_code(get_entity_type(ent))) {
1216 if (ent_is_string_const(ent))
1217 dump_string_cst(ent);
1219 dump_compound_init(env, ent);
1224 dump_compound_init(env, ent);
1234 * Dumps declarations of global variables and the initialization code.
1236 * @param gt a global like type, either the global or the TLS one
1237 * @param env an environment
1238 * @param only_emit_marked if non-zero, external allocated entities that do not have
1239 * its visited flag set are ignored
1241 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1242 int only_emit_marked)
1244 int i, n = get_compound_n_members(gt);
1245 waitq *worklist = new_waitq();
1247 if (only_emit_marked) {
1248 for (i = 0; i < n; i++) {
1249 ir_entity *ent = get_compound_member(gt, i);
1250 if (is_entity_backend_marked(ent) ||
1251 get_entity_visibility(ent) != visibility_external_allocated) {
1252 waitq_put(worklist, ent);
1253 set_entity_backend_marked(ent, 1);
1257 for (i = 0; i < n; i++) {
1258 ir_entity *ent = get_compound_member(gt, i);
1259 set_entity_backend_marked(ent, 1);
1260 waitq_put(worklist, ent);
1264 env->worklist = worklist;
1266 while (!waitq_empty(worklist)) {
1267 ir_entity *ent = waitq_get(worklist);
1269 dump_global(env, ent);
1272 del_waitq(worklist);
1273 env->worklist = NULL;
1276 /************************************************************************/
1278 /* Generate all entities. */
1279 void be_gas_emit_decls(const be_main_env_t *main_env,
1280 int only_emit_marked_entities)
1282 be_gas_decl_env_t env;
1283 memset(&env, 0, sizeof(env));
1285 env.main_env = main_env;
1287 /* dump global type */
1288 env.section = (be_gas_section_t) -1;
1289 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1290 env.section = GAS_SECTION_TLS;
1291 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1292 env.section = GAS_SECTION_CTOR;
1293 be_gas_dump_globals(get_constructors_type(), &env,
1294 only_emit_marked_entities);
1295 env.section = GAS_SECTION_PIC_SYMBOLS;
1296 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1297 only_emit_marked_entities);
1299 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1300 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1301 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1302 only_emit_marked_entities);
1303 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1304 be_emit_cstring("\t.subsections_via_symbols\n");
1305 be_emit_write_line();