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 do_dump_atomic_init(env, get_Add_left(init));
420 be_emit_cstring(" + ");
421 do_dump_atomic_init(env, get_Add_right(init));
425 do_dump_atomic_init(env, get_Sub_left(init));
426 be_emit_cstring(" - ");
427 do_dump_atomic_init(env, get_Sub_right(init));
431 do_dump_atomic_init(env, get_Mul_left(init));
432 be_emit_cstring(" * ");
433 do_dump_atomic_init(env, get_Mul_right(init));
437 assert(0 && "dump_atomic_init(): unknown IR-node");
442 * Dumps the type for given size (.byte, .long, ...)
444 * @param size the size in bytes
446 static void dump_size_type(size_t size) {
449 be_emit_cstring("\t.byte\t");
453 be_emit_cstring("\t.word\t");
457 be_emit_cstring("\t.long\t");
461 be_emit_cstring("\t.quad\t");
466 /* handled in arith */
470 be_emit_cstring("\t.octa\t");
474 panic("Try to dump a type with %u bytes\n", (unsigned) size);
479 * Emit an atomic value.
481 * @param env the gas output environment
482 * @param init a node representing the atomic value (on the const code irg)
484 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
486 ir_mode *mode = get_irn_mode(init);
487 int bytes = get_mode_size_bytes(mode);
489 dump_size_type(bytes);
490 do_dump_atomic_init(env, init);
492 be_emit_write_line();
495 /************************************************************************/
496 /* Routines to dump global variables */
497 /************************************************************************/
499 static int initializer_is_string_const(const ir_initializer_t *initializer)
502 int found_printable = 0;
504 if(initializer->kind != IR_INITIALIZER_COMPOUND)
507 len = initializer->compound.n_initializers;
510 for(i = 0; i < len; ++i) {
514 ir_initializer_t *sub_initializer
515 = initializer->compound.initializers[i];
517 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
520 tv = sub_initializer->tarval.value;
521 mode = get_tarval_mode(tv);
523 if (!mode_is_int(mode)
524 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
527 c = get_tarval_long(tv);
528 if (isgraph(c) || isspace(c))
533 if (i == len - 1 && c != '\0')
537 return found_printable;
541 * Determine if an entity is a string constant
542 * @param ent The entity
543 * @return 1 if it is a string constant, 0 otherwise
545 static int ent_is_string_const(ir_entity *ent)
547 ir_type *type, *element_type;
550 int found_printable = 0;
552 type = get_entity_type(ent);
554 /* if it's an array */
555 if (!is_Array_type(type))
558 element_type = get_array_element_type(type);
560 /* and the array's element type is primitive */
561 if (!is_Primitive_type(element_type))
564 /* and the mode of the element type is an int of
565 * the same size as the byte mode */
566 mode = get_type_mode(element_type);
567 if (!mode_is_int(mode)
568 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
571 if(ent->has_initializer) {
575 /* if it contains only printable chars and a 0 at the end */
576 n = get_compound_ent_n_values(ent);
577 for (i = 0; i < n; ++i) {
578 ir_node *irn = get_compound_ent_value(ent, i);
582 c = (int) get_tarval_long(get_Const_tarval(irn));
584 if (isgraph(c) || isspace(c))
589 if (i == n - 1 && c != '\0')
594 /* then we can emit it as a string constant */
595 return found_printable;
599 * Dump a string constant.
600 * No checks are made!!
602 * @param ent The entity to dump.
604 static void dump_string_cst(ir_entity *ent)
611 len = get_compound_ent_n_values(ent);
612 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
613 be_emit_cstring("\t.ascii \"");
615 be_emit_cstring("\t.string \"");
619 for (i = 0; i < len; ++i) {
623 irn = get_compound_ent_value(ent, i);
624 c = (int) get_tarval_long(get_Const_tarval(irn));
627 case '"' : be_emit_cstring("\\\""); break;
628 case '\n': be_emit_cstring("\\n"); break;
629 case '\r': be_emit_cstring("\\r"); break;
630 case '\t': be_emit_cstring("\\t"); break;
631 case '\\': be_emit_cstring("\\\\"); break;
636 be_emit_irprintf("\\%o", c);
640 be_emit_cstring("\"\n");
641 be_emit_write_line();
643 type = get_entity_type(ent);
644 type_size = get_type_size_bytes(type);
645 remaining_space = type_size - len;
646 assert(remaining_space >= 0);
647 if(remaining_space > 0) {
648 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
652 static void dump_string_initializer(const ir_initializer_t *initializer)
656 len = initializer->compound.n_initializers;
657 if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
658 be_emit_cstring("\t.ascii \"");
660 be_emit_cstring("\t.string \"");
664 for(i = 0; i < len; ++i) {
665 const ir_initializer_t *sub_initializer
666 = get_initializer_compound_value(initializer, i);
668 tarval *tv = get_initializer_tarval_value(sub_initializer);
669 int c = get_tarval_long(tv);
672 case '"' : be_emit_cstring("\\\""); break;
673 case '\n': be_emit_cstring("\\n"); break;
674 case '\r': be_emit_cstring("\\r"); break;
675 case '\t': be_emit_cstring("\\t"); break;
676 case '\\': be_emit_cstring("\\\\"); break;
681 be_emit_irprintf("\\%o", c);
685 be_emit_cstring("\"\n");
686 be_emit_write_line();
689 enum normal_or_bitfield_kind {
696 enum normal_or_bitfield_kind kind;
700 unsigned char bf_val;
702 } normal_or_bitfield;
704 static int is_type_variable_size(ir_type *type)
711 static size_t get_initializer_size(const ir_initializer_t *initializer,
714 switch(get_initializer_kind(initializer)) {
715 case IR_INITIALIZER_TARVAL: {
716 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
717 return get_type_size_bytes(type);
719 case IR_INITIALIZER_CONST:
720 case IR_INITIALIZER_NULL:
721 return get_type_size_bytes(type);
722 case IR_INITIALIZER_COMPOUND: {
723 if(!is_type_variable_size(type)) {
724 return get_type_size_bytes(type);
727 = get_initializer_compound_n_entries(initializer);
729 unsigned initializer_size = get_type_size_bytes(type);
730 for(i = 0; i < n_entries; ++i) {
731 ir_entity *entity = get_compound_member(type, i);
732 ir_type *type = get_entity_type(entity);
734 const ir_initializer_t *sub_initializer
735 = get_initializer_compound_value(initializer, i);
737 unsigned offset = get_entity_offset(entity);
738 unsigned size = get_initializer_size(sub_initializer, type);
740 if(offset + size > initializer_size) {
741 initializer_size = offset + size;
744 return initializer_size;
749 panic("found invalid initializer");
753 static normal_or_bitfield *glob_vals;
754 static size_t max_vals;
757 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
758 const ir_initializer_t *initializer, ir_type *type)
760 unsigned char last_bits = 0;
761 ir_mode *mode = get_type_mode(type);
763 unsigned char curr_bits;
767 switch(get_initializer_kind(initializer)) {
768 case IR_INITIALIZER_NULL:
770 case IR_INITIALIZER_TARVAL:
771 tv = get_initializer_tarval_value(initializer);
773 case IR_INITIALIZER_CONST: {
774 ir_node *node = get_initializer_const_value(initializer);
775 if(!is_Const(node)) {
776 panic("bitfield initializer not a Const node");
778 tv = get_Const_tarval(node);
781 case IR_INITIALIZER_COMPOUND:
782 panic("bitfield initializer is compound");
785 panic("Couldn't get numeric value for bitfield initializer\n");
788 /* normalize offset */
789 vals += offset_bits >> 3;
791 value_len = get_mode_size_bits(mode);
793 /* combine bits with existing bits */
794 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
795 assert((size_t) (vals - glob_vals) + j < max_vals);
796 assert(vals[j].kind == BITFIELD ||
797 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
798 vals[j].kind = BITFIELD;
799 curr_bits = get_tarval_sub_bits(tv, j);
801 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
803 last_bits = curr_bits;
807 static void dump_ir_initializer(normal_or_bitfield *vals,
808 const ir_initializer_t *initializer,
811 assert((size_t) (vals - glob_vals) < max_vals);
813 switch(get_initializer_kind(initializer)) {
814 case IR_INITIALIZER_NULL:
816 case IR_INITIALIZER_TARVAL: {
819 assert(vals->kind != BITFIELD);
821 vals->v.tarval = get_initializer_tarval_value(initializer);
822 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
823 for(i = 1; i < get_type_size_bytes(type); ++i) {
824 vals[i].kind = NORMAL;
825 vals[i].v.value = NULL;
829 case IR_INITIALIZER_CONST: {
832 assert(vals->kind != BITFIELD);
834 vals->v.value = get_initializer_const_value(initializer);
835 for(i = 1; i < get_type_size_bytes(type); ++i) {
836 vals[i].kind = NORMAL;
837 vals[i].v.value = NULL;
841 case IR_INITIALIZER_COMPOUND: {
843 size_t n = get_initializer_compound_n_entries(initializer);
845 if(is_Array_type(type)) {
846 ir_type *element_type = get_array_element_type(type);
847 size_t skip = get_type_size_bytes(element_type);
848 size_t alignment = get_type_alignment_bytes(element_type);
849 size_t misalign = skip % alignment;
851 skip += alignment - misalign;
854 for(i = 0; i < n; ++i) {
855 ir_initializer_t *sub_initializer
856 = get_initializer_compound_value(initializer, i);
858 dump_ir_initializer(vals, sub_initializer, element_type);
864 assert(is_compound_type(type));
865 n_members = get_compound_n_members(type);
866 for(i = 0; i < n_members; ++i) {
867 ir_entity *member = get_compound_member(type, i);
868 size_t offset = get_entity_offset(member);
869 ir_type *subtype = get_entity_type(member);
870 ir_mode *mode = get_type_mode(subtype);
871 ir_initializer_t *sub_initializer;
873 assert(i < get_initializer_compound_n_entries(initializer));
875 = get_initializer_compound_value(initializer, i);
879 = get_entity_offset_bits_remainder(member);
880 size_t value_len = get_mode_size_bits(mode);
882 if(offset_bits != 0 ||
883 (value_len != 8 && value_len != 16 && value_len != 32
884 && value_len != 64)) {
885 dump_bitfield(&vals[offset], offset_bits,
886 sub_initializer, subtype);
891 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
898 panic("invalid ir_initializer kind found");
901 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
903 const ir_initializer_t *initializer = entity->attr.initializer;
905 normal_or_bitfield *vals;
909 if(initializer_is_string_const(initializer)) {
910 dump_string_initializer(initializer);
914 type = get_entity_type(entity);
915 size = get_initializer_size(initializer, type);
921 * In the worst case, every initializer allocates one byte.
922 * Moreover, initializer might be big, do not allocate on stack.
924 vals = xcalloc(size, sizeof(vals[0]));
931 dump_ir_initializer(vals, initializer, type);
933 /* now write values sorted */
934 for (k = 0; k < size; ) {
935 int space = 0, skip = 0;
936 if (vals[k].kind == NORMAL) {
937 if(vals[k].v.value != NULL) {
938 dump_atomic_init(env, vals[k].v.value);
939 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
943 } else if(vals[k].kind == TARVAL) {
944 tarval *tv = vals[k].v.tarval;
945 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
950 dump_size_type(size);
951 dump_arith_tarval(tv, size);
953 be_emit_write_line();
955 assert(vals[k].kind == BITFIELD);
956 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
957 be_emit_write_line();
961 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
970 be_emit_irprintf("\t.skip\t%d\n", space);
971 be_emit_write_line();
978 * Dump an initializer for a compound entity.
980 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
982 normal_or_bitfield *vals;
984 unsigned k, last_ofs;
986 if(ent->has_initializer) {
987 dump_initializer(env, ent);
991 n = get_compound_ent_n_values(ent);
993 /* Find the initializer size. Sorrily gcc support a nasty feature:
994 The last field of a compound may be a flexible array. This allows
995 initializers bigger than the type size. */
996 last_ofs = get_type_size_bytes(get_entity_type(ent));
997 for (i = 0; i < n; ++i) {
998 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
999 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1000 ir_node *value = get_compound_ent_value(ent, i);
1001 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1003 offset += (value_len + bits_remainder + 7) >> 3;
1005 if (offset > last_ofs) {
1011 * In the worst case, every initializer allocates one byte.
1012 * Moreover, initializer might be big, do not allocate on stack.
1014 vals = xcalloc(last_ofs, sizeof(vals[0]));
1016 /* collect the values and store them at the offsets */
1017 for (i = 0; i < n; ++i) {
1018 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1019 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1020 ir_node *value = get_compound_ent_value(ent, i);
1021 int value_len = get_mode_size_bits(get_irn_mode(value));
1023 assert(offset_bits >= 0);
1025 if (offset_bits != 0 ||
1026 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1027 tarval *tv = get_atomic_init_tv(value);
1028 unsigned char curr_bits, last_bits = 0;
1030 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
1031 get_entity_ld_name(ent));
1033 /* normalize offset */
1034 offset += offset_bits >> 3;
1037 for (j = 0; value_len + offset_bits > 0; ++j) {
1038 assert(offset + j < last_ofs);
1039 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1040 vals[offset + j].kind = BITFIELD;
1041 curr_bits = get_tarval_sub_bits(tv, j);
1042 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1044 last_bits = curr_bits;
1049 assert(offset < last_ofs);
1050 assert(vals[offset].kind == NORMAL);
1051 for (i = 1; i < value_len / 8; ++i) {
1052 assert(vals[offset + i].v.value == NULL);
1054 vals[offset].v.value = value;
1058 /* now write them sorted */
1059 for (k = 0; k < last_ofs; ) {
1060 int space = 0, skip = 0;
1061 if (vals[k].kind == NORMAL) {
1062 if(vals[k].v.value != NULL) {
1063 dump_atomic_init(env, vals[k].v.value);
1064 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1069 assert(vals[k].kind == BITFIELD);
1070 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1074 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1083 be_emit_irprintf("\t.skip\t%d\n", space);
1084 be_emit_write_line();
1090 static void emit_align(unsigned alignment)
1092 if (!is_po2(alignment))
1093 panic("alignment not a power of 2");
1095 be_emit_irprintf(".p2align\t%u\n", log2_floor(alignment));
1096 be_emit_write_line();
1100 * Dump a global entity.
1102 * @param env the gas output environment
1103 * @param ent the entity to be dumped
1105 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1107 ir_type *type = get_entity_type(ent);
1108 ident *ld_ident = get_entity_ld_ident(ent);
1109 unsigned align = get_type_alignment_bytes(type);
1110 int emit_as_common = 0;
1111 be_gas_section_t section = env->section;
1112 ir_variability variability = get_entity_variability(ent);
1113 ir_visibility visibility = get_entity_visibility(ent);
1115 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1119 if (section != (be_gas_section_t) -1) {
1121 } else if (variability == variability_constant) {
1122 /* a constant entity, put it on the rdata */
1123 section = GAS_SECTION_RODATA;
1124 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1125 && ent_is_string_const(ent)) {
1126 section = GAS_SECTION_CSTRING;
1128 } else if (variability == variability_uninitialized) {
1129 /* uninitialized entity put it in bss segment */
1130 section = GAS_SECTION_COMMON;
1131 if (visibility != visibility_local)
1134 section = GAS_SECTION_DATA;
1137 if(!emit_as_common) {
1138 be_gas_emit_switch_section(section);
1141 be_dbg_variable(ent);
1143 /* global or not global */
1144 if (visibility == visibility_external_visible && !emit_as_common) {
1145 be_emit_cstring(".globl\t");
1146 be_emit_ident(ld_ident);
1148 be_emit_write_line();
1149 } else if(visibility == visibility_external_allocated) {
1150 be_emit_cstring(".globl\t");
1151 be_emit_ident(ld_ident);
1153 be_emit_write_line();
1154 /* we can return now... */
1158 if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1159 && section != GAS_SECTION_PIC_SYMBOLS) {
1163 if (!emit_as_common) {
1164 be_emit_ident(ld_ident);
1165 be_emit_cstring(":\n");
1166 be_emit_write_line();
1169 if (variability == variability_uninitialized) {
1170 if (emit_as_common) {
1171 switch (be_gas_flavour) {
1172 case GAS_FLAVOUR_ELF:
1173 case GAS_FLAVOUR_MACH_O:
1174 case GAS_FLAVOUR_YASM:
1175 be_emit_irprintf("\t.comm %s,%u,%u\n",
1176 get_id_str(ld_ident), get_type_size_bytes(type), align);
1177 be_emit_write_line();
1179 case GAS_FLAVOUR_MINGW:
1180 be_emit_irprintf("\t.comm %s,%u # %u\n",
1181 get_id_str(ld_ident), get_type_size_bytes(type), align);
1182 be_emit_write_line();
1185 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1186 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1187 be_emit_cstring("\t.indirect_symbol ");
1188 be_emit_ident(get_entity_ident(ent));
1190 be_emit_write_line();
1191 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1192 be_emit_write_line();
1194 panic("PIC trampolines not yet supported in this gas mode");
1197 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1198 be_emit_write_line();
1201 if (is_atomic_entity(ent)) {
1202 dump_atomic_init(env, get_atomic_ent_value(ent));
1204 /* sort_compound_ent_values(ent); */
1206 switch (get_type_tpop_code(get_entity_type(ent))) {
1208 if (ent_is_string_const(ent))
1209 dump_string_cst(ent);
1211 dump_compound_init(env, ent);
1216 dump_compound_init(env, ent);
1226 * Dumps declarations of global variables and the initialization code.
1228 * @param gt a global like type, either the global or the TLS one
1229 * @param env an environment
1230 * @param only_emit_marked if non-zero, external allocated entities that do not have
1231 * its visited flag set are ignored
1233 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1234 int only_emit_marked)
1236 int i, n = get_compound_n_members(gt);
1237 waitq *worklist = new_waitq();
1239 if (only_emit_marked) {
1240 for (i = 0; i < n; i++) {
1241 ir_entity *ent = get_compound_member(gt, i);
1242 if (is_entity_backend_marked(ent) ||
1243 get_entity_visibility(ent) != visibility_external_allocated) {
1244 waitq_put(worklist, ent);
1245 set_entity_backend_marked(ent, 1);
1249 for (i = 0; i < n; i++) {
1250 ir_entity *ent = get_compound_member(gt, i);
1251 set_entity_backend_marked(ent, 1);
1252 waitq_put(worklist, ent);
1256 env->worklist = worklist;
1258 while (!waitq_empty(worklist)) {
1259 ir_entity *ent = waitq_get(worklist);
1261 dump_global(env, ent);
1264 del_waitq(worklist);
1265 env->worklist = NULL;
1268 /************************************************************************/
1270 /* Generate all entities. */
1271 void be_gas_emit_decls(const be_main_env_t *main_env,
1272 int only_emit_marked_entities)
1274 be_gas_decl_env_t env;
1275 memset(&env, 0, sizeof(env));
1277 env.main_env = main_env;
1279 /* dump global type */
1280 env.section = (be_gas_section_t) -1;
1281 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1282 env.section = GAS_SECTION_TLS;
1283 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1284 env.section = GAS_SECTION_CTOR;
1285 be_gas_dump_globals(get_constructors_type(), &env,
1286 only_emit_marked_entities);
1287 env.section = GAS_SECTION_PIC_SYMBOLS;
1288 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1289 only_emit_marked_entities);
1291 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1292 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1293 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1294 only_emit_marked_entities);
1295 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1296 be_emit_cstring("\t.subsections_via_symbols\n");
1297 be_emit_write_line();