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_block_label_prefix(void) {
279 * Return the label prefix for labeled instructions.
281 const char *be_gas_insn_label_prefix(void) {
288 static void dump_label(ir_label_t label) {
289 be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
293 * Return the tarval of an atomic initializer.
295 * @param init a node representing the initializer (on the const code irg)
299 static tarval *get_atomic_init_tv(ir_node *init)
302 ir_mode *mode = get_irn_mode(init);
304 switch (get_irn_opcode(init)) {
307 init = get_Cast_op(init);
311 init = get_Conv_op(init);
315 return get_Const_tarval(init);
318 switch (get_SymConst_kind(init)) {
319 case symconst_type_size:
320 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
322 case symconst_type_align:
323 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
325 case symconst_ofs_ent:
326 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
328 case symconst_enum_const:
329 return get_enumeration_value(get_SymConst_enum(init));
345 * Dump an atomic value.
347 * @param env the gas output environment
348 * @param init a node representing the atomic value (on the const code irg)
350 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
352 ir_mode *mode = get_irn_mode(init);
353 int bytes = get_mode_size_bytes(mode);
358 init = skip_Id(init);
360 switch (get_irn_opcode(init)) {
362 do_dump_atomic_init(env, get_Cast_op(init));
366 do_dump_atomic_init(env, get_Conv_op(init));
370 tv = get_Const_tarval(init);
372 /* it's a arithmetic value */
373 dump_arith_tarval(tv, bytes);
377 switch (get_SymConst_kind(init)) {
378 case symconst_addr_name:
379 be_emit_ident(get_SymConst_name(init));
382 case symconst_addr_ent:
383 ent = get_SymConst_entity(init);
384 if(!is_entity_backend_marked(ent)) {
385 waitq_put(env->worklist, ent);
386 set_entity_backend_marked(ent, 1);
388 be_emit_ident(get_entity_ld_ident(ent));
391 case symconst_ofs_ent:
392 ent = get_SymConst_entity(init);
393 #if 0 /* not needed, is it? */
394 if(!is_entity_backend_marked(ent)) {
395 waitq_put(env->worklist, ent);
396 set_entity_backend_marked(ent, 1);
399 be_emit_irprintf("%d", get_entity_offset(ent));
402 case symconst_type_size:
403 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
406 case symconst_type_align:
407 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
410 case symconst_enum_const:
411 tv = get_enumeration_value(get_SymConst_enum(init));
412 dump_arith_tarval(tv, bytes);
416 label = get_SymConst_label(init);
421 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
426 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
427 panic("Constant must be int or pointer for '+' to work");
429 do_dump_atomic_init(env, get_Add_left(init));
430 be_emit_cstring(" + ");
431 do_dump_atomic_init(env, get_Add_right(init));
435 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
436 panic("Constant must be int or pointer for '-' to work");
438 do_dump_atomic_init(env, get_Sub_left(init));
439 be_emit_cstring(" - ");
440 do_dump_atomic_init(env, get_Sub_right(init));
444 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
445 panic("Constant must be int or pointer for '*' to work");
447 do_dump_atomic_init(env, get_Mul_left(init));
448 be_emit_cstring(" * ");
449 do_dump_atomic_init(env, get_Mul_right(init));
453 assert(0 && "dump_atomic_init(): unknown IR-node");
458 * Dumps the type for given size (.byte, .long, ...)
460 * @param size the size in bytes
462 static void dump_size_type(size_t size) {
465 be_emit_cstring("\t.byte\t");
469 be_emit_cstring("\t.word\t");
473 be_emit_cstring("\t.long\t");
477 be_emit_cstring("\t.quad\t");
482 /* handled in arith */
486 be_emit_cstring("\t.octa\t");
490 panic("Try to dump a type with %u bytes\n", (unsigned) size);
495 * Emit an atomic value.
497 * @param env the gas output environment
498 * @param init a node representing the atomic value (on the const code irg)
500 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
502 ir_mode *mode = get_irn_mode(init);
503 int bytes = get_mode_size_bytes(mode);
505 dump_size_type(bytes);
506 do_dump_atomic_init(env, init);
508 be_emit_write_line();
511 /************************************************************************/
512 /* Routines to dump global variables */
513 /************************************************************************/
515 static int initializer_is_string_const(const ir_initializer_t *initializer)
518 int found_printable = 0;
520 if(initializer->kind != IR_INITIALIZER_COMPOUND)
523 len = initializer->compound.n_initializers;
526 for(i = 0; i < len; ++i) {
530 ir_initializer_t *sub_initializer
531 = initializer->compound.initializers[i];
533 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
536 tv = sub_initializer->tarval.value;
537 mode = get_tarval_mode(tv);
539 if (!mode_is_int(mode)
540 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
543 c = get_tarval_long(tv);
544 if (isgraph(c) || isspace(c))
549 if (i == len - 1 && c != '\0')
553 return found_printable;
557 * Determine if an entity is a string constant
558 * @param ent The entity
559 * @return 1 if it is a string constant, 0 otherwise
561 static int ent_is_string_const(ir_entity *ent)
563 ir_type *type, *element_type;
566 int found_printable = 0;
568 type = get_entity_type(ent);
570 /* if it's an array */
571 if (!is_Array_type(type))
574 element_type = get_array_element_type(type);
576 /* and the array's element type is primitive */
577 if (!is_Primitive_type(element_type))
580 /* and the mode of the element type is an int of
581 * the same size as the byte mode */
582 mode = get_type_mode(element_type);
583 if (!mode_is_int(mode)
584 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
587 if(ent->has_initializer) {
591 /* if it contains only printable chars and a 0 at the end */
592 n = get_compound_ent_n_values(ent);
593 for (i = 0; i < n; ++i) {
594 ir_node *irn = get_compound_ent_value(ent, i);
598 c = (int) get_tarval_long(get_Const_tarval(irn));
600 if (isgraph(c) || isspace(c))
605 if (i == n - 1 && c != '\0')
610 /* then we can emit it as a string constant */
611 return found_printable;
615 * Dump a string constant.
616 * No checks are made!!
618 * @param ent The entity to dump.
620 static void dump_string_cst(ir_entity *ent)
627 len = get_compound_ent_n_values(ent);
628 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
629 be_emit_cstring("\t.ascii \"");
631 be_emit_cstring("\t.string \"");
635 for (i = 0; i < len; ++i) {
639 irn = get_compound_ent_value(ent, i);
640 c = (int) get_tarval_long(get_Const_tarval(irn));
643 case '"' : be_emit_cstring("\\\""); break;
644 case '\n': be_emit_cstring("\\n"); break;
645 case '\r': be_emit_cstring("\\r"); break;
646 case '\t': be_emit_cstring("\\t"); break;
647 case '\\': be_emit_cstring("\\\\"); break;
652 be_emit_irprintf("\\%o", c);
656 be_emit_cstring("\"\n");
657 be_emit_write_line();
659 type = get_entity_type(ent);
660 type_size = get_type_size_bytes(type);
661 remaining_space = type_size - len;
662 assert(remaining_space >= 0);
663 if(remaining_space > 0) {
664 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
668 static void dump_string_initializer(const ir_initializer_t *initializer)
672 len = initializer->compound.n_initializers;
673 if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
674 be_emit_cstring("\t.ascii \"");
676 be_emit_cstring("\t.string \"");
680 for(i = 0; i < len; ++i) {
681 const ir_initializer_t *sub_initializer
682 = get_initializer_compound_value(initializer, i);
684 tarval *tv = get_initializer_tarval_value(sub_initializer);
685 int c = get_tarval_long(tv);
688 case '"' : be_emit_cstring("\\\""); break;
689 case '\n': be_emit_cstring("\\n"); break;
690 case '\r': be_emit_cstring("\\r"); break;
691 case '\t': be_emit_cstring("\\t"); break;
692 case '\\': be_emit_cstring("\\\\"); break;
697 be_emit_irprintf("\\%o", c);
701 be_emit_cstring("\"\n");
702 be_emit_write_line();
705 enum normal_or_bitfield_kind {
712 enum normal_or_bitfield_kind kind;
716 unsigned char bf_val;
718 } normal_or_bitfield;
720 static int is_type_variable_size(ir_type *type)
727 static size_t get_initializer_size(const ir_initializer_t *initializer,
730 switch(get_initializer_kind(initializer)) {
731 case IR_INITIALIZER_TARVAL: {
732 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
733 return get_type_size_bytes(type);
735 case IR_INITIALIZER_CONST:
736 case IR_INITIALIZER_NULL:
737 return get_type_size_bytes(type);
738 case IR_INITIALIZER_COMPOUND: {
739 if(!is_type_variable_size(type)) {
740 return get_type_size_bytes(type);
743 = get_initializer_compound_n_entries(initializer);
745 unsigned initializer_size = get_type_size_bytes(type);
746 for(i = 0; i < n_entries; ++i) {
747 ir_entity *entity = get_compound_member(type, i);
748 ir_type *type = get_entity_type(entity);
750 const ir_initializer_t *sub_initializer
751 = get_initializer_compound_value(initializer, i);
753 unsigned offset = get_entity_offset(entity);
754 unsigned size = get_initializer_size(sub_initializer, type);
756 if(offset + size > initializer_size) {
757 initializer_size = offset + size;
760 return initializer_size;
765 panic("found invalid initializer");
769 static normal_or_bitfield *glob_vals;
770 static size_t max_vals;
773 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
774 const ir_initializer_t *initializer, ir_type *type)
776 unsigned char last_bits = 0;
777 ir_mode *mode = get_type_mode(type);
779 unsigned char curr_bits;
783 switch(get_initializer_kind(initializer)) {
784 case IR_INITIALIZER_NULL:
786 case IR_INITIALIZER_TARVAL:
787 tv = get_initializer_tarval_value(initializer);
789 case IR_INITIALIZER_CONST: {
790 ir_node *node = get_initializer_const_value(initializer);
791 if(!is_Const(node)) {
792 panic("bitfield initializer not a Const node");
794 tv = get_Const_tarval(node);
797 case IR_INITIALIZER_COMPOUND:
798 panic("bitfield initializer is compound");
801 panic("Couldn't get numeric value for bitfield initializer\n");
804 /* normalize offset */
805 vals += offset_bits >> 3;
807 value_len = get_mode_size_bits(mode);
809 /* combine bits with existing bits */
810 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
811 assert((size_t) (vals - glob_vals) + j < max_vals);
812 assert(vals[j].kind == BITFIELD ||
813 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
814 vals[j].kind = BITFIELD;
815 curr_bits = get_tarval_sub_bits(tv, j);
817 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
819 last_bits = curr_bits;
823 static void dump_ir_initializer(normal_or_bitfield *vals,
824 const ir_initializer_t *initializer,
827 assert((size_t) (vals - glob_vals) < max_vals);
829 switch(get_initializer_kind(initializer)) {
830 case IR_INITIALIZER_NULL:
832 case IR_INITIALIZER_TARVAL: {
835 assert(vals->kind != BITFIELD);
837 vals->v.tarval = get_initializer_tarval_value(initializer);
838 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
839 for(i = 1; i < get_type_size_bytes(type); ++i) {
840 vals[i].kind = NORMAL;
841 vals[i].v.value = NULL;
845 case IR_INITIALIZER_CONST: {
848 assert(vals->kind != BITFIELD);
850 vals->v.value = get_initializer_const_value(initializer);
851 for(i = 1; i < get_type_size_bytes(type); ++i) {
852 vals[i].kind = NORMAL;
853 vals[i].v.value = NULL;
857 case IR_INITIALIZER_COMPOUND: {
859 size_t n = get_initializer_compound_n_entries(initializer);
861 if(is_Array_type(type)) {
862 ir_type *element_type = get_array_element_type(type);
863 size_t skip = get_type_size_bytes(element_type);
864 size_t alignment = get_type_alignment_bytes(element_type);
865 size_t misalign = skip % alignment;
867 skip += alignment - misalign;
870 for(i = 0; i < n; ++i) {
871 ir_initializer_t *sub_initializer
872 = get_initializer_compound_value(initializer, i);
874 dump_ir_initializer(vals, sub_initializer, element_type);
880 assert(is_compound_type(type));
881 n_members = get_compound_n_members(type);
882 for(i = 0; i < n_members; ++i) {
883 ir_entity *member = get_compound_member(type, i);
884 size_t offset = get_entity_offset(member);
885 ir_type *subtype = get_entity_type(member);
886 ir_mode *mode = get_type_mode(subtype);
887 ir_initializer_t *sub_initializer;
889 assert(i < get_initializer_compound_n_entries(initializer));
891 = get_initializer_compound_value(initializer, i);
895 = get_entity_offset_bits_remainder(member);
896 size_t value_len = get_mode_size_bits(mode);
898 if(offset_bits != 0 ||
899 (value_len != 8 && value_len != 16 && value_len != 32
900 && value_len != 64)) {
901 dump_bitfield(&vals[offset], offset_bits,
902 sub_initializer, subtype);
907 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
914 panic("invalid ir_initializer kind found");
917 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
919 const ir_initializer_t *initializer = entity->attr.initializer;
921 normal_or_bitfield *vals;
925 if(initializer_is_string_const(initializer)) {
926 dump_string_initializer(initializer);
930 type = get_entity_type(entity);
931 size = get_initializer_size(initializer, type);
937 * In the worst case, every initializer allocates one byte.
938 * Moreover, initializer might be big, do not allocate on stack.
940 vals = xcalloc(size, sizeof(vals[0]));
947 dump_ir_initializer(vals, initializer, type);
949 /* now write values sorted */
950 for (k = 0; k < size; ) {
953 if (vals[k].kind == NORMAL) {
954 if(vals[k].v.value != NULL) {
955 dump_atomic_init(env, vals[k].v.value);
956 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
960 } else if(vals[k].kind == TARVAL) {
961 tarval *tv = vals[k].v.tarval;
962 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
967 dump_size_type(size);
968 dump_arith_tarval(tv, size);
970 be_emit_write_line();
972 assert(vals[k].kind == BITFIELD);
973 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
974 be_emit_write_line();
978 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
985 be_emit_irprintf("\t.skip\t%d\n", space);
986 be_emit_write_line();
993 * Dump an initializer for a compound entity.
995 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
997 normal_or_bitfield *vals;
999 unsigned k, last_ofs;
1001 if(ent->has_initializer) {
1002 dump_initializer(env, ent);
1006 n = get_compound_ent_n_values(ent);
1008 /* Find the initializer size. Sorrily gcc support a nasty feature:
1009 The last field of a compound may be a flexible array. This allows
1010 initializers bigger than the type size. */
1011 last_ofs = get_type_size_bytes(get_entity_type(ent));
1012 for (i = 0; i < n; ++i) {
1013 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1014 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1015 ir_node *value = get_compound_ent_value(ent, i);
1016 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1018 offset += (value_len + bits_remainder + 7) >> 3;
1020 if (offset > last_ofs) {
1026 * In the worst case, every initializer allocates one byte.
1027 * Moreover, initializer might be big, do not allocate on stack.
1029 vals = xcalloc(last_ofs, sizeof(vals[0]));
1031 /* collect the values and store them at the offsets */
1032 for (i = 0; i < n; ++i) {
1033 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1034 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1035 ir_node *value = get_compound_ent_value(ent, i);
1036 int value_len = get_mode_size_bits(get_irn_mode(value));
1038 assert(offset_bits >= 0);
1040 if (offset_bits != 0 ||
1041 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1042 tarval *tv = get_atomic_init_tv(value);
1043 unsigned char curr_bits, last_bits = 0;
1045 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
1046 get_entity_ld_name(ent));
1048 /* normalize offset */
1049 offset += offset_bits >> 3;
1052 for (j = 0; value_len + offset_bits > 0; ++j) {
1053 assert(offset + j < last_ofs);
1054 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1055 vals[offset + j].kind = BITFIELD;
1056 curr_bits = get_tarval_sub_bits(tv, j);
1057 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1059 last_bits = curr_bits;
1064 assert(offset < last_ofs);
1065 assert(vals[offset].kind == NORMAL);
1066 for (i = 1; i < value_len / 8; ++i) {
1067 assert(vals[offset + i].v.value == NULL);
1069 vals[offset].v.value = value;
1073 /* now write them sorted */
1074 for (k = 0; k < last_ofs; ) {
1075 int space = 0, skip = 0;
1076 if (vals[k].kind == NORMAL) {
1077 if(vals[k].v.value != NULL) {
1078 dump_atomic_init(env, vals[k].v.value);
1079 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1084 assert(vals[k].kind == BITFIELD);
1085 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1089 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1098 be_emit_irprintf("\t.skip\t%d\n", space);
1099 be_emit_write_line();
1105 static void emit_align(unsigned alignment)
1107 if (!is_po2(alignment))
1108 panic("alignment not a power of 2");
1110 be_emit_irprintf(".p2align\t%u\n", log2_floor(alignment));
1111 be_emit_write_line();
1115 * Dump a global entity.
1117 * @param env the gas output environment
1118 * @param ent the entity to be dumped
1120 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1122 ir_type *type = get_entity_type(ent);
1123 ident *ld_ident = get_entity_ld_ident(ent);
1124 unsigned align = get_type_alignment_bytes(type);
1125 int emit_as_common = 0;
1126 be_gas_section_t section = env->section;
1127 ir_variability variability = get_entity_variability(ent);
1128 ir_visibility visibility = get_entity_visibility(ent);
1130 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1134 if (section != (be_gas_section_t) -1) {
1136 } else if (variability == variability_constant) {
1137 /* a constant entity, put it on the rdata */
1138 section = GAS_SECTION_RODATA;
1139 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1140 && ent_is_string_const(ent)) {
1141 section = GAS_SECTION_CSTRING;
1143 } else if (variability == variability_uninitialized) {
1144 /* uninitialized entity put it in bss segment */
1145 section = GAS_SECTION_COMMON;
1146 if (visibility != visibility_local)
1149 section = GAS_SECTION_DATA;
1152 if(!emit_as_common) {
1153 be_gas_emit_switch_section(section);
1156 be_dbg_variable(ent);
1158 /* global or not global */
1159 if (visibility == visibility_external_visible && !emit_as_common) {
1160 be_emit_cstring(".globl\t");
1161 be_emit_ident(ld_ident);
1163 be_emit_write_line();
1164 } else if(visibility == visibility_external_allocated) {
1165 be_emit_cstring(".globl\t");
1166 be_emit_ident(ld_ident);
1168 be_emit_write_line();
1169 /* we can return now... */
1173 if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1174 && section != GAS_SECTION_PIC_SYMBOLS) {
1178 if (!emit_as_common) {
1179 be_emit_ident(ld_ident);
1180 be_emit_cstring(":\n");
1181 be_emit_write_line();
1184 if (variability == variability_uninitialized) {
1185 if (emit_as_common) {
1186 switch (be_gas_flavour) {
1187 case GAS_FLAVOUR_ELF:
1188 case GAS_FLAVOUR_MACH_O:
1189 case GAS_FLAVOUR_YASM:
1190 be_emit_irprintf("\t.comm %s,%u,%u\n",
1191 get_id_str(ld_ident), get_type_size_bytes(type), align);
1192 be_emit_write_line();
1194 case GAS_FLAVOUR_MINGW:
1195 be_emit_irprintf("\t.comm %s,%u # %u\n",
1196 get_id_str(ld_ident), get_type_size_bytes(type), align);
1197 be_emit_write_line();
1200 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1201 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1202 be_emit_cstring("\t.indirect_symbol ");
1203 be_emit_ident(get_entity_ident(ent));
1205 be_emit_write_line();
1206 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1207 be_emit_write_line();
1209 panic("PIC trampolines not yet supported in this gas mode");
1212 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1213 be_emit_write_line();
1216 if (is_atomic_entity(ent)) {
1217 dump_atomic_init(env, get_atomic_ent_value(ent));
1219 /* sort_compound_ent_values(ent); */
1221 switch (get_type_tpop_code(get_entity_type(ent))) {
1223 if (ent_is_string_const(ent))
1224 dump_string_cst(ent);
1226 dump_compound_init(env, ent);
1231 dump_compound_init(env, ent);
1241 * Dumps declarations of global variables and the initialization code.
1243 * @param gt a global like type, either the global or the TLS one
1244 * @param env an environment
1245 * @param only_emit_marked if non-zero, external allocated entities that do not have
1246 * its visited flag set are ignored
1248 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1249 int only_emit_marked)
1251 int i, n = get_compound_n_members(gt);
1252 waitq *worklist = new_waitq();
1254 if (only_emit_marked) {
1255 for (i = 0; i < n; i++) {
1256 ir_entity *ent = get_compound_member(gt, i);
1257 if (is_entity_backend_marked(ent) ||
1258 get_entity_visibility(ent) != visibility_external_allocated) {
1259 waitq_put(worklist, ent);
1260 set_entity_backend_marked(ent, 1);
1264 for (i = 0; i < n; i++) {
1265 ir_entity *ent = get_compound_member(gt, i);
1266 set_entity_backend_marked(ent, 1);
1267 waitq_put(worklist, ent);
1271 env->worklist = worklist;
1273 while (!waitq_empty(worklist)) {
1274 ir_entity *ent = waitq_get(worklist);
1276 dump_global(env, ent);
1279 del_waitq(worklist);
1280 env->worklist = NULL;
1283 /************************************************************************/
1285 /* Generate all entities. */
1286 void be_gas_emit_decls(const be_main_env_t *main_env,
1287 int only_emit_marked_entities)
1289 be_gas_decl_env_t env;
1290 memset(&env, 0, sizeof(env));
1292 env.main_env = main_env;
1294 /* dump global type */
1295 env.section = (be_gas_section_t) -1;
1296 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1297 env.section = GAS_SECTION_TLS;
1298 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1299 env.section = GAS_SECTION_CTOR;
1300 be_gas_dump_globals(get_constructors_type(), &env,
1301 only_emit_marked_entities);
1302 env.section = GAS_SECTION_PIC_SYMBOLS;
1303 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1304 only_emit_marked_entities);
1306 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1307 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1308 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1309 only_emit_marked_entities);
1310 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1311 be_emit_cstring("\t.subsections_via_symbols\n");
1312 be_emit_write_line();