2 * Copyright (C) 1995-2007 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
21 * Dumps global variables and constants as gas assembler.
22 * @author Christian Wuerdig, Matthias Braun
46 #include "beemitter.h"
47 #include "be_dbgout.h"
49 typedef struct obstack obstack_t;
51 /** by default, we generate assembler code for the Linux gas */
52 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_NORMAL;
55 * Return the pseudo-instruction to be issued for a section switch
56 * depending on the current flavour.
58 * @param section the section to switch to
60 * @return the pseudo-instruction
62 static const char *get_section_name(be_gas_section_t section) {
63 static const char *text[GAS_FLAVOUR_MAX][GAS_SECTION_MAX] = {
69 ".section\t.tbss,\"awT\",@nobits",
70 ".section\t.ctors,\"aw\",@progbits"
75 ".section .rdata,\"dr\"",
77 ".section\t.tbss,\"awT\",@nobits",
78 ".section\t.ctors,\"aw\",@progbits"
82 assert(be_gas_flavour >= 0 && be_gas_flavour < GAS_FLAVOUR_MAX);
83 assert(section >= 0 && section < GAS_SECTION_MAX);
84 return text[be_gas_flavour][section];
88 * Emit necessary code to switch to a section.
90 * @param env the emitter environment
91 * @param section the section to switch to
93 void be_gas_emit_switch_section(be_emit_env_t *env, be_gas_section_t section) {
94 be_emit_char(env, '\t');
95 be_emit_string(env, get_section_name(section));
96 be_emit_char(env, '\n');
97 be_emit_write_line(env);
100 typedef struct _ia32_decl_env {
101 obstack_t *rodata_obst;
102 obstack_t *data_obst;
104 obstack_t *ctor_obst;
105 const be_main_env_t *main_env;
109 /************************************************************************/
114 static void dump_arith_tarval(obstack_t *obst, tarval *tv, int bytes)
119 obstack_printf(obst, "0x%02x", get_tarval_sub_bits(tv, 0));
123 obstack_printf(obst, "0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
127 obstack_printf(obst, "0x%02x%02x%02x%02x",
128 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
132 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x",
133 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
134 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
142 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x"
143 "%02x%02x%02x%02x%02x%02x%02x%02x",
144 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
145 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
146 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
147 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
148 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
149 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
150 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
151 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
156 fprintf(stderr, "Try to dump an tarval with %d bytes\n", bytes);
162 * Return the tarval of an atomic initializer.
164 static tarval *get_atomic_init_tv(ir_node *init)
167 ir_mode *mode = get_irn_mode(init);
169 switch (get_irn_opcode(init)) {
172 init = get_Cast_op(init);
176 init = get_Conv_op(init);
180 return get_Const_tarval(init);
183 switch (get_SymConst_kind(init)) {
184 case symconst_ofs_ent:
185 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
187 case symconst_type_size:
188 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
190 case symconst_type_align:
191 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
193 case symconst_enum_const:
194 return get_enumeration_value(get_SymConst_enum(init));
207 * dump an atomic value
209 static void do_dump_atomic_init(ia32_decl_env_t *env, obstack_t *obst,
212 ir_mode *mode = get_irn_mode(init);
213 int bytes = get_mode_size_bytes(mode);
217 switch (get_irn_opcode(init)) {
220 do_dump_atomic_init(env, obst, get_Cast_op(init));
224 do_dump_atomic_init(env, obst, get_Conv_op(init));
228 tv = get_Const_tarval(init);
230 /* it's a arithmetic value */
231 dump_arith_tarval(obst, tv, bytes);
235 switch (get_SymConst_kind(init)) {
236 case symconst_addr_name:
237 obstack_printf(obst, "%s", get_id_str(get_SymConst_name(init)));
240 case symconst_addr_ent:
241 ent = get_SymConst_entity(init);
242 if(!entity_visited(ent)) {
243 waitq_put(env->worklist, ent);
244 mark_entity_visited(ent);
246 obstack_printf(obst, "%s", get_entity_ld_name(ent));
249 case symconst_ofs_ent:
250 ent = get_SymConst_entity(init);
251 #if 0 /* not needed, is it? */
252 if(!entity_visited(ent)) {
253 waitq_put(env->worklist, ent);
254 mark_entity_visited(ent);
257 obstack_printf(obst, "%d", get_entity_offset(ent));
260 case symconst_type_size:
261 obstack_printf(obst, "%d", get_type_size_bytes(get_SymConst_type(init)));
264 case symconst_type_align:
265 obstack_printf(obst, "%d", get_type_alignment_bytes(get_SymConst_type(init)));
268 case symconst_enum_const:
269 tv = get_enumeration_value(get_SymConst_enum(init));
270 dump_arith_tarval(obst, tv, bytes);
274 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
279 do_dump_atomic_init(env, obst, get_Add_left(init));
280 obstack_printf(obst, " + ");
281 do_dump_atomic_init(env, obst, get_Add_right(init));
285 do_dump_atomic_init(env, obst, get_Sub_left(init));
286 obstack_printf(obst, " - ");
287 do_dump_atomic_init(env, obst, get_Sub_right(init));
291 do_dump_atomic_init(env, obst, get_Mul_left(init));
292 obstack_printf(obst, " * ");
293 do_dump_atomic_init(env, obst, get_Mul_right(init));
297 assert(0 && "dump_atomic_init(): unknown IR-node");
302 * dumps the type for given size (.byte, .long, ...)
304 static void dump_size_type(obstack_t *obst, int size) {
308 obstack_printf(obst, "\t.byte\t");
312 obstack_printf(obst, "\t.value\t");
316 obstack_printf(obst, "\t.long\t");
320 obstack_printf(obst, "\t.quad\t");
325 /* handled in arith */
329 obstack_printf(obst, "\t.octa\t");
333 fprintf(stderr, "Try to dump a type with %d bytes\n", size);
339 * dump an atomic value to an obstack
341 static void dump_atomic_init(ia32_decl_env_t *env, obstack_t *obst,
344 ir_mode *mode = get_irn_mode(init);
345 int bytes = get_mode_size_bytes(mode);
347 dump_size_type(obst, bytes);
348 do_dump_atomic_init(env, obst, init);
349 obstack_printf(obst, "\n");
352 /************************************************************************/
353 /* Routines to dump global variables */
354 /************************************************************************/
357 * Determine if an entity is a string constant
358 * @param ent The entity
359 * @return 1 if it is a string constant, 0 otherwise
361 static int ent_is_string_const(ir_entity *ent)
363 ir_type *type, *element_type;
367 type = get_entity_type(ent);
369 /* if it's an array */
370 if (!is_Array_type(type))
373 element_type = get_array_element_type(type);
375 /* and the array's element type is primitive */
376 if (!is_Primitive_type(element_type))
379 /* and the mode of the element type is an int of
380 * the same size as the byte mode */
381 mode = get_type_mode(element_type);
382 if (!mode_is_int(mode)
383 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
386 /* if it contains only printable chars and a 0 at the end */
387 n = get_compound_ent_n_values(ent);
388 for (i = 0; i < n; ++i) {
389 ir_node *irn = get_compound_ent_value(ent, i);
390 if(get_irn_opcode(irn) != iro_Const)
393 c = (int) get_tarval_long(get_Const_tarval(irn));
395 if((i < n - 1 && !(isgraph(c) || isspace(c)))
396 || (i == n - 1 && c != '\0'))
400 /* then we can emit it as a string constant */
405 * Dump a string constant.
406 * No checks are made!!
407 * @param obst The obst to dump on.
408 * @param ent The entity to dump.
410 static void dump_string_cst(obstack_t *obst, ir_entity *ent)
414 obstack_printf(obst, "\t.string \"");
415 n = get_compound_ent_n_values(ent);
417 for (i = 0; i < n-1; ++i) {
421 irn = get_compound_ent_value(ent, i);
422 c = (int) get_tarval_long(get_Const_tarval(irn));
425 case '"' : obstack_printf(obst, "\\\""); break;
426 case '\n': obstack_printf(obst, "\\n"); break;
427 case '\r': obstack_printf(obst, "\\r"); break;
428 case '\t': obstack_printf(obst, "\\t"); break;
429 case '\\': obstack_printf(obst, "\\\\"); break;
432 obstack_printf(obst, "%c", c);
434 obstack_printf(obst, "\\%o", c);
438 obstack_printf(obst, "\"\n");
441 static void dump_array_init(ia32_decl_env_t *env, obstack_t *obst,
444 const ir_type *ty = get_entity_type(ent);
449 /* potential spare values should be already included! */
450 for (i = 0; i < get_compound_ent_n_values(ent); ++i) {
451 ir_entity *step = get_compound_ent_value_member(ent, i);
452 ir_type *stype = get_entity_type(step);
454 if (get_type_mode(stype)) {
455 int align = (get_type_alignment_bits(stype) + 7) >> 3;
456 int n = size % align;
459 obstack_printf(obst, "\t.zero\t%d\n", align - n);
463 dump_atomic_init(env, obst, get_compound_ent_value(ent, i));
464 size += get_type_size_bytes(stype);
466 filler = get_type_size_bytes(ty) - size;
469 obstack_printf(obst, "\t.skip\t%d\n", filler);
472 enum normal_or_bitfield_kind {
478 enum normal_or_bitfield_kind kind;
481 unsigned char bf_val;
483 } normal_or_bitfield;
486 * Dump an initializer for a compound entity.
488 static void dump_compound_init(ia32_decl_env_t *env, obstack_t *obst,
491 normal_or_bitfield *vals;
492 int i, j, n = get_compound_ent_n_values(ent);
495 /* Find the initializer size. Sorrily gcc support a nasty feature:
496 The last field of a compound may be a flexible array. This allows
497 initializers bigger than the type size. */
498 last_ofs = get_type_size_bytes(get_entity_type(ent));
499 for (i = 0; i < n; ++i) {
500 int offset = get_compound_ent_value_offset_bytes(ent, i);
501 int bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
502 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
503 int path_len = get_compound_graph_path_length(path);
504 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
505 int value_len = get_type_size_bits(get_entity_type(last_ent));
507 offset += (value_len + bits_remainder + 7) >> 3;
509 if (offset > last_ofs) {
515 * In the worst case, every initializer allocates one byte.
516 * Moreover, initializer might be big, do not allocate on stack.
518 vals = xcalloc(last_ofs, sizeof(vals[0]));
520 /* collect the values and store them at the offsets */
521 for (i = 0; i < n; ++i) {
522 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
523 int path_len = get_compound_graph_path_length(path);
524 int offset = get_compound_ent_value_offset_bytes(ent, i);
525 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
526 ir_node *value = get_compound_ent_value(ent, i);
527 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
528 int value_len = get_type_size_bits(get_entity_type(last_ent));
530 assert(offset_bits >= 0);
532 if (offset_bits != 0 ||
533 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
534 tarval *shift, *shifted;
535 tarval *tv = get_atomic_init_tv(value);
537 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
538 get_entity_ld_name(ent));
540 tv = tarval_convert_to(tv, mode_Lu);
541 shift = new_tarval_from_long(offset_bits, mode_Is);
542 shifted = tarval_shl(tv, shift);
543 if (shifted == tarval_bad || shifted == tarval_undefined) {
544 panic("Couldn't shift numeric value for bitfield initializer '%s'\n",
545 get_entity_ld_name(ent));
548 for (j = 0; value_len > 0; ++j) {
549 assert(offset + j < last_ofs);
550 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
551 vals[offset + j].kind = BITFIELD;
552 vals[offset + j].v.bf_val |= get_tarval_sub_bits(shifted, j);
553 value_len -= 8 - offset_bits;
557 assert(offset < last_ofs);
558 assert(vals[offset].kind == NORMAL);
559 assert(vals[offset].v.value == NULL);
560 vals[offset].v.value = value;
564 /* now write them sorted */
565 for (i = 0; i < last_ofs; ) {
566 int space = 0, skip = 0;
567 if (vals[i].kind == NORMAL) {
568 if(vals[i].v.value != NULL) {
569 dump_atomic_init(env, obst, vals[i].v.value);
570 skip = get_mode_size_bytes(get_irn_mode(vals[i].v.value)) - 1;
575 assert(vals[i].kind == BITFIELD);
576 obstack_printf(obst, "\t.byte\t%d\n", vals[i].v.bf_val);
581 while (i < last_ofs && vals[i].kind == NORMAL && vals[i].v.value == NULL) {
590 obstack_printf(obst, "\t.skip\t%d\n", space);
596 * Dump a global entity.
598 static void dump_global(ia32_decl_env_t *env, ir_entity *ent, int emit_commons)
601 ir_type *type = get_entity_type(ent);
602 const char *ld_name = get_entity_ld_name(ent);
603 ir_variability variability = get_entity_variability(ent);
604 ir_visibility visibility = get_entity_visibility(ent);
605 int align = get_type_alignment_bytes(type);
606 int emit_as_common = 0;
608 obst = env->data_obst;
609 if (is_Method_type(type)) {
610 if (get_method_img_section(ent) == section_constructors) {
611 obst = env->ctor_obst;
612 obstack_printf(obst, ".balign\t%d\n", align);
613 dump_size_type(obst, align);
614 obstack_printf(obst, "%s\n", ld_name);
617 } else if (variability == variability_constant) {
618 /* a constant entity, put it on the rdata */
619 obst = env->rodata_obst;
620 } else if (variability == variability_uninitialized) {
621 /* uninitialized entity put it in bss segment */
622 obst = env->bss_obst;
623 if(emit_commons && visibility != visibility_local)
627 be_dbg_variable(env->main_env->db_handle, obst, ent);
629 /* global or not global */
630 if (visibility == visibility_external_visible && !emit_as_common) {
631 obstack_printf(obst, ".global\t%s\n", ld_name);
632 } else if(visibility == visibility_external_allocated) {
633 obstack_printf(obst, ".global\t%s\n", ld_name);
634 /* we can return now... */
638 if (align > 1 && !emit_as_common) {
639 obstack_printf(obst, ".balign\t%d\n", align);
642 if (!emit_as_common) {
643 obstack_printf(obst, "%s:\n", ld_name);
646 if (variability == variability_uninitialized) {
648 obstack_printf(obst, "\t.comm %s,%d,%d\n",
649 ld_name, get_type_size_bytes(type), align);
651 obstack_printf(obst, "\t.zero %d\n", get_type_size_bytes(type));
653 } else if (is_atomic_type(type)) {
654 dump_atomic_init(env, obst, get_atomic_ent_value(ent));
655 } else if (ent_is_string_const(ent)) {
656 dump_string_cst(obst, ent);
657 } else if (is_Array_type(type)) {
658 dump_array_init(env, obst, ent);
659 } else if (is_compound_type(type)) {
660 dump_compound_init(env, obst, ent);
662 assert(0 && "unsupported type");
667 * Dumps declarations of global variables and the initialization code.
669 static void ia32_dump_globals(ir_type *gt, ia32_decl_env_t *env,
670 int emit_commons, int only_emit_marked)
672 int i, n = get_compound_n_members(gt);
673 waitq *worklist = new_waitq();
675 if(only_emit_marked) {
676 for (i = 0; i < n; i++) {
677 ir_entity *ent = get_compound_member(gt, i);
678 if(entity_visited(ent) ||
679 get_entity_visibility(ent) != visibility_external_allocated) {
680 waitq_put(worklist, ent);
681 mark_entity_visited(ent);
685 inc_master_type_visited();
686 for (i = 0; i < n; i++) {
687 ir_entity *ent = get_compound_member(gt, i);
688 mark_entity_visited(ent);
689 waitq_put(worklist, ent);
693 env->worklist = worklist;
695 while(!waitq_empty(worklist)) {
696 ir_entity *ent = waitq_get(worklist);
698 dump_global(env, ent, emit_commons);
702 env->worklist = NULL;
705 /************************************************************************/
707 void be_gas_emit_decls(be_emit_env_t *emit, const be_main_env_t *main_env,
708 int only_emit_marked_entities)
711 obstack_t rodata, data, bss, ctor;
715 /* dump the global type */
716 obstack_init(&rodata);
721 env.rodata_obst = &rodata;
722 env.data_obst = &data;
724 env.ctor_obst = &ctor;
725 env.main_env = main_env;
727 ia32_dump_globals(get_glob_type(), &env, 1, only_emit_marked_entities);
729 size = obstack_object_size(&data);
730 cp = obstack_finish(&data);
732 be_gas_emit_switch_section(emit, GAS_SECTION_DATA);
733 be_emit_string_len(emit, cp, size);
734 be_emit_write_line(emit);
737 size = obstack_object_size(&rodata);
738 cp = obstack_finish(&rodata);
740 be_gas_emit_switch_section(emit, GAS_SECTION_RODATA);
741 be_emit_string_len(emit, cp, size);
742 be_emit_write_line(emit);
745 size = obstack_object_size(&bss);
746 cp = obstack_finish(&bss);
748 be_gas_emit_switch_section(emit, GAS_SECTION_COMMON);
749 be_emit_string_len(emit, cp, size);
750 be_emit_write_line(emit);
753 size = obstack_object_size(&ctor);
754 cp = obstack_finish(&ctor);
756 be_gas_emit_switch_section(emit, GAS_SECTION_CTOR);
757 be_emit_string_len(emit, cp, size);
758 be_emit_write_line(emit);
761 obstack_free(&rodata, NULL);
762 obstack_free(&data, NULL);
763 obstack_free(&bss, NULL);
764 obstack_free(&ctor, NULL);
766 /* dump the Thread Local Storage */
769 env.rodata_obst = &data;
770 env.data_obst = &data;
771 env.bss_obst = &data;
772 env.ctor_obst = NULL;
774 ia32_dump_globals(get_tls_type(), &env, 0, only_emit_marked_entities);
776 size = obstack_object_size(&data);
777 cp = obstack_finish(&data);
779 be_gas_emit_switch_section(emit, GAS_SECTION_TLS);
780 be_emit_cstring(emit, ".balign\t32\n");
781 be_emit_write_line(emit);
782 be_emit_string_len(emit, cp, size);
783 be_emit_write_line(emit);
786 obstack_free(&data, NULL);