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
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 typedef struct obstack obstack_t;
52 /** by default, we generate assembler code for the Linux gas */
53 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_NORMAL;
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_MAX][GAS_SECTION_MAX] = {
70 ".section\t.tbss,\"awT\",@nobits",
71 ".section\t.ctors,\"aw\",@progbits"
76 ".section .rdata,\"dr\"",
78 ".section\t.tbss,\"awT\",@nobits",
79 ".section\t.ctors,\"aw\",@progbits"
83 assert(be_gas_flavour >= 0 && be_gas_flavour < GAS_FLAVOUR_MAX);
84 assert(section >= 0 && section < GAS_SECTION_MAX);
85 return text[be_gas_flavour][section];
89 * Emit necessary code to switch to a section.
91 * @param env the emitter environment
92 * @param section the section to switch to
94 void be_gas_emit_switch_section(be_emit_env_t *env, be_gas_section_t section) {
95 be_emit_char(env, '\t');
96 be_emit_string(env, get_section_name(section));
97 be_emit_char(env, '\n');
98 be_emit_write_line(env);
101 typedef struct _ia32_decl_env {
102 obstack_t *rodata_obst;
103 obstack_t *data_obst;
105 obstack_t *ctor_obst;
106 const be_main_env_t *main_env;
110 /************************************************************************/
115 static void dump_arith_tarval(obstack_t *obst, tarval *tv, int bytes)
120 obstack_printf(obst, "0x%02x", get_tarval_sub_bits(tv, 0));
124 obstack_printf(obst, "0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
128 obstack_printf(obst, "0x%02x%02x%02x%02x",
129 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
133 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x",
134 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
135 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
143 obstack_printf(obst, "0x%02x%02x%02x%02x%02x%02x%02x%02x"
144 "%02x%02x%02x%02x%02x%02x%02x%02x",
145 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
146 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
147 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
148 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
149 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
150 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
151 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
152 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
157 fprintf(stderr, "Try to dump an tarval with %d bytes\n", bytes);
163 * Return the tarval of an atomic initializer.
165 static tarval *get_atomic_init_tv(ir_node *init)
168 ir_mode *mode = get_irn_mode(init);
170 switch (get_irn_opcode(init)) {
173 init = get_Cast_op(init);
177 init = get_Conv_op(init);
181 return get_Const_tarval(init);
184 switch (get_SymConst_kind(init)) {
185 case symconst_ofs_ent:
186 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
188 case symconst_type_size:
189 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
191 case symconst_type_align:
192 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
194 case symconst_enum_const:
195 return get_enumeration_value(get_SymConst_enum(init));
208 * dump an atomic value
210 static void do_dump_atomic_init(ia32_decl_env_t *env, obstack_t *obst,
213 ir_mode *mode = get_irn_mode(init);
214 int bytes = get_mode_size_bytes(mode);
218 switch (get_irn_opcode(init)) {
221 do_dump_atomic_init(env, obst, get_Cast_op(init));
225 do_dump_atomic_init(env, obst, get_Conv_op(init));
229 tv = get_Const_tarval(init);
231 /* it's a arithmetic value */
232 dump_arith_tarval(obst, tv, bytes);
236 switch (get_SymConst_kind(init)) {
237 case symconst_addr_name:
238 obstack_printf(obst, "%s", get_id_str(get_SymConst_name(init)));
241 case symconst_addr_ent:
242 ent = get_SymConst_entity(init);
243 if(!entity_visited(ent)) {
244 waitq_put(env->worklist, ent);
245 mark_entity_visited(ent);
247 obstack_printf(obst, "%s", get_entity_ld_name(ent));
250 case symconst_ofs_ent:
251 ent = get_SymConst_entity(init);
252 #if 0 /* not needed, is it? */
253 if(!entity_visited(ent)) {
254 waitq_put(env->worklist, ent);
255 mark_entity_visited(ent);
258 obstack_printf(obst, "%d", get_entity_offset(ent));
261 case symconst_type_size:
262 obstack_printf(obst, "%d", get_type_size_bytes(get_SymConst_type(init)));
265 case symconst_type_align:
266 obstack_printf(obst, "%d", get_type_alignment_bytes(get_SymConst_type(init)));
269 case symconst_enum_const:
270 tv = get_enumeration_value(get_SymConst_enum(init));
271 dump_arith_tarval(obst, tv, bytes);
275 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
280 do_dump_atomic_init(env, obst, get_Add_left(init));
281 obstack_printf(obst, " + ");
282 do_dump_atomic_init(env, obst, get_Add_right(init));
286 do_dump_atomic_init(env, obst, get_Sub_left(init));
287 obstack_printf(obst, " - ");
288 do_dump_atomic_init(env, obst, get_Sub_right(init));
292 do_dump_atomic_init(env, obst, get_Mul_left(init));
293 obstack_printf(obst, " * ");
294 do_dump_atomic_init(env, obst, get_Mul_right(init));
298 assert(0 && "dump_atomic_init(): unknown IR-node");
303 * dumps the type for given size (.byte, .long, ...)
305 static void dump_size_type(obstack_t *obst, int size) {
309 obstack_printf(obst, "\t.byte\t");
313 obstack_printf(obst, "\t.value\t");
317 obstack_printf(obst, "\t.long\t");
321 obstack_printf(obst, "\t.quad\t");
326 /* handled in arith */
330 obstack_printf(obst, "\t.octa\t");
334 fprintf(stderr, "Try to dump a type with %d bytes\n", size);
340 * dump an atomic value to an obstack
342 static void dump_atomic_init(ia32_decl_env_t *env, obstack_t *obst,
345 ir_mode *mode = get_irn_mode(init);
346 int bytes = get_mode_size_bytes(mode);
348 dump_size_type(obst, bytes);
349 do_dump_atomic_init(env, obst, init);
350 obstack_printf(obst, "\n");
353 /************************************************************************/
354 /* Routines to dump global variables */
355 /************************************************************************/
358 * Determine if an entity is a string constant
359 * @param ent The entity
360 * @return 1 if it is a string constant, 0 otherwise
362 static int ent_is_string_const(ir_entity *ent)
364 ir_type *type, *element_type;
368 type = get_entity_type(ent);
370 /* if it's an array */
371 if (!is_Array_type(type))
374 element_type = get_array_element_type(type);
376 /* and the array's element type is primitive */
377 if (!is_Primitive_type(element_type))
380 /* and the mode of the element type is an int of
381 * the same size as the byte mode */
382 mode = get_type_mode(element_type);
383 if (!mode_is_int(mode)
384 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
387 /* if it contains only printable chars and a 0 at the end */
388 n = get_compound_ent_n_values(ent);
389 for (i = 0; i < n; ++i) {
390 ir_node *irn = get_compound_ent_value(ent, i);
391 if(get_irn_opcode(irn) != iro_Const)
394 c = (int) get_tarval_long(get_Const_tarval(irn));
396 if((i < n - 1 && !(isgraph(c) || isspace(c)))
397 || (i == n - 1 && c != '\0'))
401 /* then we can emit it as a string constant */
406 * Dump a string constant.
407 * No checks are made!!
408 * @param obst The obst to dump on.
409 * @param ent The entity to dump.
411 static void dump_string_cst(obstack_t *obst, ir_entity *ent)
415 obstack_printf(obst, "\t.string \"");
416 n = get_compound_ent_n_values(ent);
418 for (i = 0; i < n-1; ++i) {
422 irn = get_compound_ent_value(ent, i);
423 c = (int) get_tarval_long(get_Const_tarval(irn));
426 case '"' : obstack_printf(obst, "\\\""); break;
427 case '\n': obstack_printf(obst, "\\n"); break;
428 case '\r': obstack_printf(obst, "\\r"); break;
429 case '\t': obstack_printf(obst, "\\t"); break;
430 case '\\': obstack_printf(obst, "\\\\"); break;
433 obstack_printf(obst, "%c", c);
435 obstack_printf(obst, "\\%o", c);
439 obstack_printf(obst, "\"\n");
442 static void dump_array_init(ia32_decl_env_t *env, obstack_t *obst,
445 const ir_type *ty = get_entity_type(ent);
450 /* potential spare values should be already included! */
451 for (i = 0; i < get_compound_ent_n_values(ent); ++i) {
452 ir_entity *step = get_compound_ent_value_member(ent, i);
453 ir_type *stype = get_entity_type(step);
455 if (get_type_mode(stype)) {
456 int align = (get_type_alignment_bits(stype) + 7) >> 3;
457 int n = size % align;
460 obstack_printf(obst, "\t.zero\t%d\n", align - n);
464 dump_atomic_init(env, obst, get_compound_ent_value(ent, i));
465 size += get_type_size_bytes(stype);
467 filler = get_type_size_bytes(ty) - size;
470 obstack_printf(obst, "\t.skip\t%d\n", filler);
473 enum normal_or_bitfield_kind {
479 enum normal_or_bitfield_kind kind;
482 unsigned char bf_val;
484 } normal_or_bitfield;
487 * Dump an initializer for a compound entity.
489 static void dump_compound_init(ia32_decl_env_t *env, obstack_t *obst,
492 normal_or_bitfield *vals;
493 int i, j, n = get_compound_ent_n_values(ent);
496 /* Find the initializer size. Sorrily gcc support a nasty feature:
497 The last field of a compound may be a flexible array. This allows
498 initializers bigger than the type size. */
499 last_ofs = get_type_size_bytes(get_entity_type(ent));
500 for (i = 0; i < n; ++i) {
501 int offset = get_compound_ent_value_offset_bytes(ent, i);
502 int bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
503 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
504 int path_len = get_compound_graph_path_length(path);
505 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
506 int value_len = get_type_size_bits(get_entity_type(last_ent));
508 offset += (value_len + bits_remainder + 7) >> 3;
510 if (offset > last_ofs) {
516 * In the worst case, every initializer allocates one byte.
517 * Moreover, initializer might be big, do not allocate on stack.
519 vals = xcalloc(last_ofs, sizeof(vals[0]));
521 /* collect the values and store them at the offsets */
522 for (i = 0; i < n; ++i) {
523 const compound_graph_path *path = get_compound_ent_value_path(ent, i);
524 int path_len = get_compound_graph_path_length(path);
525 int offset = get_compound_ent_value_offset_bytes(ent, i);
526 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
527 ir_node *value = get_compound_ent_value(ent, i);
528 ir_entity *last_ent = get_compound_graph_path_node(path, path_len - 1);
529 int value_len = get_type_size_bits(get_entity_type(last_ent));
531 assert(offset_bits >= 0);
533 if (offset_bits != 0 ||
534 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
535 tarval *shift, *shifted;
536 tarval *tv = get_atomic_init_tv(value);
538 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
539 get_entity_ld_name(ent));
541 tv = tarval_convert_to(tv, mode_Lu);
542 shift = new_tarval_from_long(offset_bits, mode_Is);
543 shifted = tarval_shl(tv, shift);
544 if (shifted == tarval_bad || shifted == tarval_undefined) {
545 panic("Couldn't shift numeric value for bitfield initializer '%s'\n",
546 get_entity_ld_name(ent));
549 for (j = 0; value_len > 0; ++j) {
550 assert(offset + j < last_ofs);
551 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
552 vals[offset + j].kind = BITFIELD;
553 vals[offset + j].v.bf_val |= get_tarval_sub_bits(shifted, j);
554 value_len -= 8 - offset_bits;
558 assert(offset < last_ofs);
559 assert(vals[offset].kind == NORMAL);
560 assert(vals[offset].v.value == NULL);
561 vals[offset].v.value = value;
565 /* now write them sorted */
566 for (i = 0; i < last_ofs; ) {
567 int space = 0, skip = 0;
568 if (vals[i].kind == NORMAL) {
569 if(vals[i].v.value != NULL) {
570 dump_atomic_init(env, obst, vals[i].v.value);
571 skip = get_mode_size_bytes(get_irn_mode(vals[i].v.value)) - 1;
576 assert(vals[i].kind == BITFIELD);
577 obstack_printf(obst, "\t.byte\t%d\n", vals[i].v.bf_val);
582 while (i < last_ofs && vals[i].kind == NORMAL && vals[i].v.value == NULL) {
591 obstack_printf(obst, "\t.skip\t%d\n", space);
597 * Dump a global entity.
599 static void dump_global(ia32_decl_env_t *env, ir_entity *ent, int emit_commons)
602 ir_type *type = get_entity_type(ent);
603 const char *ld_name = get_entity_ld_name(ent);
604 ir_variability variability = get_entity_variability(ent);
605 ir_visibility visibility = get_entity_visibility(ent);
606 int align = get_type_alignment_bytes(type);
607 int emit_as_common = 0;
609 obst = env->data_obst;
610 if (is_Method_type(type)) {
611 if (get_method_img_section(ent) == section_constructors) {
612 obst = env->ctor_obst;
613 obstack_printf(obst, ".balign\t%d\n", align);
614 dump_size_type(obst, align);
615 obstack_printf(obst, "%s\n", ld_name);
618 } else if (variability == variability_constant) {
619 /* a constant entity, put it on the rdata */
620 obst = env->rodata_obst;
621 } else if (variability == variability_uninitialized) {
622 /* uninitialized entity put it in bss segment */
623 obst = env->bss_obst;
624 if(emit_commons && visibility != visibility_local)
628 be_dbg_variable(env->main_env->db_handle, obst, ent);
630 /* global or not global */
631 if (visibility == visibility_external_visible && !emit_as_common) {
632 obstack_printf(obst, ".global\t%s\n", ld_name);
633 } else if(visibility == visibility_external_allocated) {
634 obstack_printf(obst, ".global\t%s\n", ld_name);
635 /* we can return now... */
639 if (align > 1 && !emit_as_common) {
640 obstack_printf(obst, ".balign\t%d\n", align);
643 if (!emit_as_common) {
644 obstack_printf(obst, "%s:\n", ld_name);
647 if (variability == variability_uninitialized) {
649 obstack_printf(obst, "\t.comm %s,%d,%d\n",
650 ld_name, get_type_size_bytes(type), align);
652 obstack_printf(obst, "\t.zero %d\n", get_type_size_bytes(type));
654 } else if (is_atomic_type(type)) {
655 dump_atomic_init(env, obst, get_atomic_ent_value(ent));
656 } else if (ent_is_string_const(ent)) {
657 dump_string_cst(obst, ent);
658 } else if (is_Array_type(type)) {
659 dump_array_init(env, obst, ent);
660 } else if (is_compound_type(type)) {
661 dump_compound_init(env, obst, ent);
663 assert(0 && "unsupported type");
668 * Dumps declarations of global variables and the initialization code.
670 static void ia32_dump_globals(ir_type *gt, ia32_decl_env_t *env,
671 int emit_commons, int only_emit_marked)
673 int i, n = get_compound_n_members(gt);
674 waitq *worklist = new_waitq();
676 if(only_emit_marked) {
677 for (i = 0; i < n; i++) {
678 ir_entity *ent = get_compound_member(gt, i);
679 if(entity_visited(ent) ||
680 get_entity_visibility(ent) != visibility_external_allocated) {
681 waitq_put(worklist, ent);
682 mark_entity_visited(ent);
686 inc_master_type_visited();
687 for (i = 0; i < n; i++) {
688 ir_entity *ent = get_compound_member(gt, i);
689 mark_entity_visited(ent);
690 waitq_put(worklist, ent);
694 env->worklist = worklist;
696 while(!waitq_empty(worklist)) {
697 ir_entity *ent = waitq_get(worklist);
699 dump_global(env, ent, emit_commons);
703 env->worklist = NULL;
706 /************************************************************************/
708 void be_gas_emit_decls(be_emit_env_t *emit, const be_main_env_t *main_env,
709 int only_emit_marked_entities)
712 obstack_t rodata, data, bss, ctor;
716 /* dump the global type */
717 obstack_init(&rodata);
722 env.rodata_obst = &rodata;
723 env.data_obst = &data;
725 env.ctor_obst = &ctor;
726 env.main_env = main_env;
728 ia32_dump_globals(get_glob_type(), &env, 1, only_emit_marked_entities);
730 size = obstack_object_size(&data);
731 cp = obstack_finish(&data);
733 be_gas_emit_switch_section(emit, GAS_SECTION_DATA);
734 be_emit_string_len(emit, cp, size);
735 be_emit_write_line(emit);
738 size = obstack_object_size(&rodata);
739 cp = obstack_finish(&rodata);
741 be_gas_emit_switch_section(emit, GAS_SECTION_RODATA);
742 be_emit_string_len(emit, cp, size);
743 be_emit_write_line(emit);
746 size = obstack_object_size(&bss);
747 cp = obstack_finish(&bss);
749 be_gas_emit_switch_section(emit, GAS_SECTION_COMMON);
750 be_emit_string_len(emit, cp, size);
751 be_emit_write_line(emit);
754 size = obstack_object_size(&ctor);
755 cp = obstack_finish(&ctor);
757 be_gas_emit_switch_section(emit, GAS_SECTION_CTOR);
758 be_emit_string_len(emit, cp, size);
759 be_emit_write_line(emit);
762 obstack_free(&rodata, NULL);
763 obstack_free(&data, NULL);
764 obstack_free(&bss, NULL);
765 obstack_free(&ctor, NULL);
767 /* dump the Thread Local Storage */
770 env.rodata_obst = &data;
771 env.data_obst = &data;
772 env.bss_obst = &data;
773 env.ctor_obst = NULL;
775 ia32_dump_globals(get_tls_type(), &env, 0, only_emit_marked_entities);
777 size = obstack_object_size(&data);
778 cp = obstack_finish(&data);
780 be_gas_emit_switch_section(emit, GAS_SECTION_TLS);
781 be_emit_cstring(emit, ".balign\t32\n");
782 be_emit_write_line(emit);
783 be_emit_string_len(emit, cp, size);
784 be_emit_write_line(emit);
787 obstack_free(&data, NULL);