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
45 #include "beemitter.h"
46 #include "be_dbgout.h"
48 /** by default, we generate assembler code for the Linux gas */
49 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_ELF;
51 static be_gas_section_t current_section = (be_gas_section_t) -1;
54 * Return the pseudo-instruction to be issued for a section switch
55 * depending on the current flavour.
57 * @param section the section to switch to
59 * @return the pseudo-instruction
61 static const char *get_section_name(be_gas_section_t section) {
62 static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
63 { /* GAS_FLAVOUR_ELF */
68 ".section\t.tbss,\"awT\",@nobits",
69 ".section\t.ctors,\"aw\",@progbits",
70 ".section\t.dtors,\"aw\",@progbits",
71 NULL, /* no cstring section */
75 { /* GAS_FLAVOUR_MINGW */
78 ".section .rdata,\"dr\"",
80 ".section\t.tbss,\"awT\",@nobits",
81 ".section\t.ctors,\"aw\",@progbits",
82 ".section\t.dtors,\"aw\",@progbits",
87 { /* GAS_FLAVOUR_YASM */
92 ".section\t.tbss,\"awT\",@nobits",
93 ".section\t.ctors,\"aw\",@progbits",
94 ".section\t.dtors,\"aw\",@progbits",
99 { /* GAS_FLAVOUR_MACH_O */
104 NULL, /* TLS is not supported on Mach-O */
106 NULL, /* TODO: how is this called? */
108 ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
109 ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
113 assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
114 assert((int) section >= 0 && section <= GAS_SECTION_LAST);
115 return text[be_gas_flavour][section];
118 void be_gas_emit_switch_section(be_gas_section_t section) {
119 if (current_section == section)
123 be_emit_string(get_section_name(section));
125 be_emit_write_line();
126 current_section = section;
129 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
131 const char *name = get_entity_ld_name(entity);
132 const char *fill_byte = "";
133 unsigned maximum_skip;
135 be_gas_emit_switch_section(GAS_SECTION_TEXT);
137 /* write the begin line (used by scripts processing the assembler... */
138 be_emit_write_line();
139 be_emit_cstring("# -- Begin ");
140 be_emit_string(name);
142 be_emit_write_line();
144 /* gcc fills space between function with 0x90, no idea if this is needed */
145 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
150 maximum_skip = (1 << alignment) - 1;
151 be_emit_cstring("\t.p2align ");
152 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
153 be_emit_write_line();
155 if (get_entity_visibility(entity) == visibility_external_visible) {
156 be_emit_cstring(".globl ");
157 be_emit_string(name);
159 be_emit_write_line();
162 switch (be_gas_flavour) {
163 case GAS_FLAVOUR_ELF:
164 be_emit_cstring("\t.type\t");
165 be_emit_string(name);
166 be_emit_cstring(", @function\n");
167 be_emit_write_line();
169 case GAS_FLAVOUR_MINGW:
170 be_emit_cstring("\t.def\t");
171 be_emit_string(name);
172 if (get_entity_visibility(entity) == visibility_external_visible) {
173 be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
175 be_emit_cstring(";\t.scl\t3;\t.type\t32;\t.endef\n");
177 be_emit_write_line();
179 case GAS_FLAVOUR_MACH_O:
180 case GAS_FLAVOUR_YASM:
183 be_emit_string(name);
184 be_emit_cstring(":\n");
185 be_emit_write_line();
188 void be_gas_emit_function_epilog(ir_entity *entity)
190 const char *name = get_entity_ld_name(entity);
192 if (be_gas_flavour == GAS_FLAVOUR_ELF) {
193 be_emit_cstring("\t.size\t");
194 be_emit_string(name);
195 be_emit_cstring(", .-");
196 be_emit_string(name);
198 be_emit_write_line();
201 be_emit_cstring("# -- End ");
202 be_emit_string(name);
204 be_emit_write_line();
208 * An environment containing all needed dumper data.
209 * Currently we create the file completely in memory first, then
210 * write it to the disk. This is an artifact from the old C-generating backend
211 * and even there NOT needed. So we might change it in the future.
213 typedef struct _be_gas_decl_env {
214 be_gas_section_t section;
215 waitq *worklist; /**< A worklist we use to place not yet handled entities on. */
218 /************************************************************************/
223 * @param tv the tarval
224 * @param bytes the width of the tarvals value in bytes
226 static void dump_arith_tarval(tarval *tv, int bytes)
230 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
234 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
238 be_emit_irprintf("0x%02x%02x%02x%02x",
239 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
243 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
244 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
245 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
249 /* Beware: Mixed endian output! One little endian number emitted as
250 * three longs. Each long initializer is written in big endian. */
252 "\t.long\t0x%02x%02x%02x%02x\n"
253 "\t.long\t0x%02x%02x%02x%02x\n"
254 "\t.long\t0x%02x%02x%02x%02x",
255 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
256 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0),
257 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
258 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
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)
266 "\t.long\t0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x",
267 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
268 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
269 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
270 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
271 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
272 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
273 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
274 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0)
279 panic("Can't dump a tarval with %d bytes", bytes);
283 * Return the label prefix for labeled blocks.
285 const char *be_gas_block_label_prefix(void) {
290 * Return the label prefix for labeled instructions.
292 const char *be_gas_insn_label_prefix(void) {
299 static void dump_label(ir_label_t label) {
300 be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
304 * Return the tarval of an atomic initializer.
306 * @param init a node representing the initializer (on the const code irg)
310 static tarval *get_atomic_init_tv(ir_node *init)
313 ir_mode *mode = get_irn_mode(init);
315 switch (get_irn_opcode(init)) {
318 init = get_Cast_op(init);
322 init = get_Conv_op(init);
326 return get_Const_tarval(init);
329 switch (get_SymConst_kind(init)) {
330 case symconst_type_size:
331 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
333 case symconst_type_align:
334 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
336 case symconst_ofs_ent:
337 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
339 case symconst_enum_const:
340 return get_enumeration_value(get_SymConst_enum(init));
356 * Dump an atomic value.
358 * @param env the gas output environment
359 * @param init a node representing the atomic value (on the const code irg)
361 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
363 ir_mode *mode = get_irn_mode(init);
364 int bytes = get_mode_size_bytes(mode);
369 init = skip_Id(init);
371 switch (get_irn_opcode(init)) {
373 do_dump_atomic_init(env, get_Cast_op(init));
377 do_dump_atomic_init(env, get_Conv_op(init));
381 tv = get_Const_tarval(init);
383 /* it's a arithmetic value */
384 dump_arith_tarval(tv, bytes);
388 switch (get_SymConst_kind(init)) {
389 case symconst_addr_name:
390 be_emit_ident(get_SymConst_name(init));
393 case symconst_addr_ent:
394 ent = get_SymConst_entity(init);
395 if (!is_entity_backend_marked(ent)) {
396 waitq_put(env->worklist, ent);
397 set_entity_backend_marked(ent, 1);
399 be_emit_ident(get_entity_ld_ident(ent));
402 case symconst_ofs_ent:
403 ent = get_SymConst_entity(init);
404 #if 0 /* not needed, is it? */
405 if (!is_entity_backend_marked(ent)) {
406 waitq_put(env->worklist, ent);
407 set_entity_backend_marked(ent, 1);
410 be_emit_irprintf("%d", get_entity_offset(ent));
413 case symconst_type_size:
414 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
417 case symconst_type_align:
418 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
421 case symconst_enum_const:
422 tv = get_enumeration_value(get_SymConst_enum(init));
423 dump_arith_tarval(tv, bytes);
427 label = get_SymConst_label(init);
432 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
437 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
438 panic("Constant must be int or pointer for '+' to work");
440 do_dump_atomic_init(env, get_Add_left(init));
441 be_emit_cstring(" + ");
442 do_dump_atomic_init(env, get_Add_right(init));
446 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
447 panic("Constant must be int or pointer for '-' to work");
449 do_dump_atomic_init(env, get_Sub_left(init));
450 be_emit_cstring(" - ");
451 do_dump_atomic_init(env, get_Sub_right(init));
455 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
456 panic("Constant must be int or pointer for '*' to work");
458 do_dump_atomic_init(env, get_Mul_left(init));
459 be_emit_cstring(" * ");
460 do_dump_atomic_init(env, get_Mul_right(init));
464 panic("dump_atomic_init(): unsupported IR-node %+F", init);
469 * Dumps the type for given size (.byte, .long, ...)
471 * @param size the size in bytes
473 static void dump_size_type(size_t size) {
476 be_emit_cstring("\t.byte\t");
480 be_emit_cstring("\t.word\t");
484 be_emit_cstring("\t.long\t");
488 be_emit_cstring("\t.quad\t");
493 /* handled in arith */
497 be_emit_cstring("\t.octa\t");
501 panic("Try to dump a type with %u bytes", (unsigned)size);
506 * Emit an atomic value.
508 * @param env the gas output environment
509 * @param init a node representing the atomic value (on the const code irg)
511 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
513 ir_mode *mode = get_irn_mode(init);
514 int bytes = get_mode_size_bytes(mode);
516 dump_size_type(bytes);
517 do_dump_atomic_init(env, init);
519 be_emit_write_line();
522 /************************************************************************/
523 /* Routines to dump global variables */
524 /************************************************************************/
526 static int initializer_is_string_const(const ir_initializer_t *initializer)
529 int found_printable = 0;
531 if (initializer->kind != IR_INITIALIZER_COMPOUND)
534 len = initializer->compound.n_initializers;
537 for (i = 0; i < len; ++i) {
541 ir_initializer_t *sub_initializer
542 = initializer->compound.initializers[i];
544 if (sub_initializer->kind != IR_INITIALIZER_TARVAL)
547 tv = sub_initializer->tarval.value;
548 mode = get_tarval_mode(tv);
550 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
553 c = get_tarval_long(tv);
554 if (isgraph(c) || isspace(c))
559 if (i == len - 1 && c != '\0')
563 return found_printable;
567 * Determine if an entity is a string constant
568 * @param ent The entity
569 * @return 1 if it is a string constant, 0 otherwise
571 static int ent_is_string_const(ir_entity *ent)
573 ir_type *type, *element_type;
576 int found_printable = 0;
578 type = get_entity_type(ent);
580 /* if it's an array */
581 if (!is_Array_type(type))
584 element_type = get_array_element_type(type);
586 /* and the array's element type is primitive */
587 if (!is_Primitive_type(element_type))
590 /* and the mode of the element type is an int of
591 * the same size as the byte mode */
592 mode = get_type_mode(element_type);
593 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
596 if (ent->has_initializer) {
600 /* if it contains only printable chars and a 0 at the end */
601 n = get_compound_ent_n_values(ent);
602 for (i = 0; i < n; ++i) {
603 ir_node *irn = get_compound_ent_value(ent, i);
607 c = (int) get_tarval_long(get_Const_tarval(irn));
609 if (isgraph(c) || isspace(c))
614 if (i == n - 1 && c != '\0')
619 /* then we can emit it as a string constant */
620 return found_printable;
624 * Dump a string constant.
625 * No checks are made!!
627 * @param ent The entity to dump.
629 static void dump_string_cst(ir_entity *ent)
637 len = get_compound_ent_n_values(ent);
639 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
640 be_emit_cstring("\t.ascii \"");
642 be_emit_cstring("\t.string \"");
646 for (i = 0; i < output_len; ++i) {
650 irn = get_compound_ent_value(ent, i);
651 c = (int) get_tarval_long(get_Const_tarval(irn));
654 case '"' : be_emit_cstring("\\\""); break;
655 case '\n': be_emit_cstring("\\n"); break;
656 case '\r': be_emit_cstring("\\r"); break;
657 case '\t': be_emit_cstring("\\t"); break;
658 case '\\': be_emit_cstring("\\\\"); break;
663 be_emit_irprintf("\\%o", c);
667 be_emit_cstring("\"\n");
668 be_emit_write_line();
670 type = get_entity_type(ent);
671 type_size = get_type_size_bytes(type);
672 remaining_space = type_size - len;
673 assert(remaining_space >= 0);
674 if (remaining_space > 0) {
675 be_emit_irprintf("\t.space\t%d\n", remaining_space);
679 static void dump_string_initializer(const ir_initializer_t *initializer)
683 len = initializer->compound.n_initializers;
684 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
685 be_emit_cstring("\t.ascii \"");
687 be_emit_cstring("\t.string \"");
691 for (i = 0; i < len; ++i) {
692 const ir_initializer_t *sub_initializer
693 = get_initializer_compound_value(initializer, i);
695 tarval *tv = get_initializer_tarval_value(sub_initializer);
696 int c = get_tarval_long(tv);
699 case '"' : be_emit_cstring("\\\""); break;
700 case '\n': be_emit_cstring("\\n"); break;
701 case '\r': be_emit_cstring("\\r"); break;
702 case '\t': be_emit_cstring("\\t"); break;
703 case '\\': be_emit_cstring("\\\\"); break;
708 be_emit_irprintf("\\%o", c);
712 be_emit_cstring("\"\n");
713 be_emit_write_line();
716 enum normal_or_bitfield_kind {
723 enum normal_or_bitfield_kind kind;
727 unsigned char bf_val;
729 } normal_or_bitfield;
731 static int is_type_variable_size(ir_type *type)
738 static size_t get_initializer_size(const ir_initializer_t *initializer,
741 switch (get_initializer_kind(initializer)) {
742 case IR_INITIALIZER_TARVAL: {
743 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
744 return get_type_size_bytes(type);
746 case IR_INITIALIZER_CONST:
747 case IR_INITIALIZER_NULL:
748 return get_type_size_bytes(type);
749 case IR_INITIALIZER_COMPOUND: {
750 if (!is_type_variable_size(type)) {
751 return get_type_size_bytes(type);
754 = get_initializer_compound_n_entries(initializer);
756 unsigned initializer_size = get_type_size_bytes(type);
757 for (i = 0; i < n_entries; ++i) {
758 ir_entity *entity = get_compound_member(type, i);
759 ir_type *type = get_entity_type(entity);
761 const ir_initializer_t *sub_initializer
762 = get_initializer_compound_value(initializer, i);
764 unsigned offset = get_entity_offset(entity);
765 unsigned size = get_initializer_size(sub_initializer, type);
767 if (offset + size > initializer_size) {
768 initializer_size = offset + size;
771 return initializer_size;
776 panic("found invalid initializer");
780 static normal_or_bitfield *glob_vals;
781 static size_t max_vals;
784 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
785 const ir_initializer_t *initializer, ir_type *type)
787 unsigned char last_bits = 0;
788 ir_mode *mode = get_type_mode(type);
790 unsigned char curr_bits;
794 switch (get_initializer_kind(initializer)) {
795 case IR_INITIALIZER_NULL:
797 case IR_INITIALIZER_TARVAL:
798 tv = get_initializer_tarval_value(initializer);
800 case IR_INITIALIZER_CONST: {
801 ir_node *node = get_initializer_const_value(initializer);
802 if (!is_Const(node)) {
803 panic("bitfield initializer not a Const node");
805 tv = get_Const_tarval(node);
808 case IR_INITIALIZER_COMPOUND:
809 panic("bitfield initializer is compound");
812 panic("Couldn't get numeric value for bitfield initializer");
814 tv = tarval_convert_to(tv, get_type_mode(type));
816 /* normalize offset */
817 vals += offset_bits >> 3;
819 value_len = get_mode_size_bits(mode);
821 /* combine bits with existing bits */
822 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
823 assert((size_t) (vals - glob_vals) + j < max_vals);
824 assert(vals[j].kind == BITFIELD ||
825 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
826 vals[j].kind = BITFIELD;
827 curr_bits = get_tarval_sub_bits(tv, j);
829 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
831 last_bits = curr_bits;
835 static void dump_ir_initializer(normal_or_bitfield *vals,
836 const ir_initializer_t *initializer,
839 assert((size_t) (vals - glob_vals) < max_vals);
841 switch (get_initializer_kind(initializer)) {
842 case IR_INITIALIZER_NULL:
844 case IR_INITIALIZER_TARVAL: {
847 assert(vals->kind != BITFIELD);
849 vals->v.tarval = get_initializer_tarval_value(initializer);
850 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
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_CONST: {
860 assert(vals->kind != BITFIELD);
862 vals->v.value = get_initializer_const_value(initializer);
863 for (i = 1; i < get_type_size_bytes(type); ++i) {
864 vals[i].kind = NORMAL;
865 vals[i].v.value = NULL;
869 case IR_INITIALIZER_COMPOUND: {
871 size_t n = get_initializer_compound_n_entries(initializer);
873 if (is_Array_type(type)) {
874 ir_type *element_type = get_array_element_type(type);
875 size_t skip = get_type_size_bytes(element_type);
876 size_t alignment = get_type_alignment_bytes(element_type);
877 size_t misalign = skip % alignment;
879 skip += alignment - misalign;
882 for (i = 0; i < n; ++i) {
883 ir_initializer_t *sub_initializer
884 = get_initializer_compound_value(initializer, i);
886 dump_ir_initializer(vals, sub_initializer, element_type);
892 assert(is_compound_type(type));
893 n_members = get_compound_n_members(type);
894 for (i = 0; i < n_members; ++i) {
895 ir_entity *member = get_compound_member(type, i);
896 size_t offset = get_entity_offset(member);
897 ir_type *subtype = get_entity_type(member);
898 ir_mode *mode = get_type_mode(subtype);
899 ir_initializer_t *sub_initializer;
901 assert(i < get_initializer_compound_n_entries(initializer));
903 = get_initializer_compound_value(initializer, i);
907 = get_entity_offset_bits_remainder(member);
908 size_t value_len = get_mode_size_bits(mode);
910 if (offset_bits != 0 ||
911 (value_len != 8 && value_len != 16 && value_len != 32
912 && value_len != 64)) {
913 dump_bitfield(&vals[offset], offset_bits,
914 sub_initializer, subtype);
919 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
926 panic("invalid ir_initializer kind found");
929 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
931 const ir_initializer_t *initializer = entity->attr.initializer;
933 normal_or_bitfield *vals;
937 if (initializer_is_string_const(initializer)) {
938 dump_string_initializer(initializer);
942 type = get_entity_type(entity);
943 size = get_initializer_size(initializer, type);
949 * In the worst case, every initializer allocates one byte.
950 * Moreover, initializer might be big, do not allocate on stack.
952 vals = XMALLOCNZ(normal_or_bitfield, size);
959 dump_ir_initializer(vals, initializer, type);
961 /* now write values sorted */
962 for (k = 0; k < size; ) {
965 if (vals[k].kind == NORMAL) {
966 if (vals[k].v.value != NULL) {
967 dump_atomic_init(env, vals[k].v.value);
968 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
972 } else if (vals[k].kind == TARVAL) {
973 tarval *tv = vals[k].v.tarval;
974 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
979 dump_size_type(size);
980 dump_arith_tarval(tv, size);
982 be_emit_write_line();
984 assert(vals[k].kind == BITFIELD);
985 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
986 be_emit_write_line();
990 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
997 be_emit_irprintf("\t.space\t%d\n", space);
998 be_emit_write_line();
1005 * Dump an initializer for a compound entity.
1007 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
1009 normal_or_bitfield *vals;
1011 unsigned k, last_ofs;
1013 if (ent->has_initializer) {
1014 dump_initializer(env, ent);
1018 n = get_compound_ent_n_values(ent);
1020 /* Find the initializer size. Sorrily gcc support a nasty feature:
1021 The last field of a compound may be a flexible array. This allows
1022 initializers bigger than the type size. */
1023 last_ofs = get_type_size_bytes(get_entity_type(ent));
1024 for (i = 0; i < n; ++i) {
1025 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1026 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1027 ir_node *value = get_compound_ent_value(ent, i);
1028 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1030 offset += (value_len + bits_remainder + 7) >> 3;
1032 if (offset > last_ofs) {
1038 * In the worst case, every initializer allocates one byte.
1039 * Moreover, initializer might be big, do not allocate on stack.
1041 vals = XMALLOCNZ(normal_or_bitfield, last_ofs);
1043 /* collect the values and store them at the offsets */
1044 for (i = 0; i < n; ++i) {
1045 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1046 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1047 ir_node *value = get_compound_ent_value(ent, i);
1048 int value_len = get_mode_size_bits(get_irn_mode(value));
1050 assert(offset_bits >= 0);
1052 if (offset_bits != 0 ||
1053 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1054 tarval *tv = get_atomic_init_tv(value);
1055 unsigned char curr_bits, last_bits = 0;
1057 panic("Couldn't get numeric value for bitfield initializer '%s'",
1058 get_entity_ld_name(ent));
1060 /* normalize offset */
1061 offset += offset_bits >> 3;
1064 for (j = 0; value_len + offset_bits > 0; ++j) {
1065 assert(offset + j < last_ofs);
1066 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1067 vals[offset + j].kind = BITFIELD;
1068 curr_bits = get_tarval_sub_bits(tv, j);
1069 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1071 last_bits = curr_bits;
1076 assert(offset < last_ofs);
1077 assert(vals[offset].kind == NORMAL);
1078 for (i = 1; i < value_len / 8; ++i) {
1079 assert(vals[offset + i].v.value == NULL);
1081 vals[offset].v.value = value;
1085 /* now write them sorted */
1086 for (k = 0; k < last_ofs; ) {
1087 int space = 0, skip = 0;
1088 if (vals[k].kind == NORMAL) {
1089 if (vals[k].v.value != NULL) {
1090 dump_atomic_init(env, vals[k].v.value);
1091 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1096 assert(vals[k].kind == BITFIELD);
1097 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1101 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1110 be_emit_irprintf("\t.space\t%d\n", space);
1111 be_emit_write_line();
1117 static void emit_align(unsigned p2alignment)
1119 be_emit_irprintf("\t.p2align\t%u\n", log2_floor(p2alignment));
1120 be_emit_write_line();
1123 static unsigned get_effective_entity_alignment(ir_entity *entity)
1125 unsigned alignment = get_entity_alignment(entity);
1126 if (alignment == 0) {
1127 ir_type *type = get_entity_type(entity);
1128 alignment = get_type_alignment_bytes(type);
1135 * Dump a global entity.
1137 * @param env the gas output environment
1138 * @param ent the entity to be dumped
1140 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1142 ir_type *type = get_entity_type(ent);
1143 ident *ld_ident = get_entity_ld_ident(ent);
1144 unsigned alignment = get_effective_entity_alignment(ent);
1145 int emit_as_common = 0;
1146 be_gas_section_t section = env->section;
1147 ir_variability variability = get_entity_variability(ent);
1148 ir_visibility visibility = get_entity_visibility(ent);
1150 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1154 if (section != (be_gas_section_t) -1) {
1156 } else if (variability == variability_constant) {
1157 /* a constant entity, put it on the rdata */
1158 section = GAS_SECTION_RODATA;
1159 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1160 && ent_is_string_const(ent)) {
1161 section = GAS_SECTION_CSTRING;
1163 } else if (variability == variability_uninitialized) {
1164 /* uninitialized entity put it in bss segment */
1165 section = GAS_SECTION_COMMON;
1166 if (visibility != visibility_local)
1169 section = GAS_SECTION_DATA;
1172 if (!emit_as_common) {
1173 be_gas_emit_switch_section(section);
1176 be_dbg_variable(ent);
1178 /* global or not global */
1179 if (visibility == visibility_external_visible && !emit_as_common) {
1180 be_emit_cstring(".globl\t");
1181 be_emit_ident(ld_ident);
1183 be_emit_write_line();
1184 } else if (visibility == visibility_external_allocated) {
1185 be_emit_cstring(".globl\t");
1186 be_emit_ident(ld_ident);
1188 be_emit_write_line();
1189 /* we can return now... */
1192 if (!is_po2(alignment))
1193 panic("alignment not a power of 2");
1195 if (alignment > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1196 && section != GAS_SECTION_PIC_SYMBOLS) {
1197 emit_align(alignment);
1200 if (visibility != visibility_external_allocated && !emit_as_common
1201 && be_gas_flavour == GAS_FLAVOUR_ELF) {
1202 be_emit_cstring("\t.type\t");
1203 be_emit_ident(ld_ident);
1204 be_emit_cstring(", @object\n\t.size\t");
1205 be_emit_ident(ld_ident);
1206 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1209 if (!emit_as_common) {
1210 be_emit_ident(ld_ident);
1211 be_emit_cstring(":\n");
1212 be_emit_write_line();
1215 if (variability == variability_uninitialized) {
1216 if (emit_as_common) {
1217 switch (be_gas_flavour) {
1218 case GAS_FLAVOUR_MACH_O:
1219 be_emit_irprintf("\t.comm %s,%u,%u\n",
1220 get_id_str(ld_ident), get_type_size_bytes(type),
1221 log2_floor(alignment));
1223 case GAS_FLAVOUR_ELF:
1224 case GAS_FLAVOUR_YASM:
1225 be_emit_irprintf("\t.comm %s,%u,%u\n",
1226 get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1227 be_emit_write_line();
1229 case GAS_FLAVOUR_MINGW:
1230 be_emit_irprintf("\t.comm %s,%u # %u\n",
1231 get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1232 be_emit_write_line();
1235 } else if (section == GAS_SECTION_PIC_TRAMPOLINES
1236 || section == GAS_SECTION_PIC_SYMBOLS) {
1237 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1238 be_emit_cstring("\t.indirect_symbol ");
1239 be_emit_ident(get_entity_ident(ent));
1241 be_emit_write_line();
1242 if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1243 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1244 be_emit_write_line();
1246 assert(section == GAS_SECTION_PIC_SYMBOLS);
1247 be_emit_cstring("\t.long 0\n");
1248 be_emit_write_line();
1251 panic("PIC trampolines not yet supported in this gas mode");
1254 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1255 be_emit_write_line();
1258 if (is_atomic_entity(ent)) {
1259 dump_atomic_init(env, get_atomic_ent_value(ent));
1261 /* sort_compound_ent_values(ent); */
1263 switch (get_type_tpop_code(get_entity_type(ent))) {
1265 if (ent_is_string_const(ent))
1266 dump_string_cst(ent);
1268 dump_compound_init(env, ent);
1273 dump_compound_init(env, ent);
1276 panic("Unimplemented type kind in dump_global()");
1283 * Dumps declarations of global variables and the initialization code.
1285 * @param gt a global like type, either the global or the TLS one
1286 * @param env an environment
1287 * @param only_emit_marked if non-zero, external allocated entities that do not have
1288 * its visited flag set are ignored
1290 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1291 int only_emit_marked)
1293 int i, n = get_compound_n_members(gt);
1294 waitq *worklist = new_waitq();
1296 if (only_emit_marked) {
1297 for (i = 0; i < n; i++) {
1298 ir_entity *ent = get_compound_member(gt, i);
1299 if (is_entity_backend_marked(ent) ||
1300 get_entity_visibility(ent) != visibility_external_allocated) {
1301 waitq_put(worklist, ent);
1302 set_entity_backend_marked(ent, 1);
1306 for (i = 0; i < n; i++) {
1307 ir_entity *ent = get_compound_member(gt, i);
1308 set_entity_backend_marked(ent, 1);
1309 waitq_put(worklist, ent);
1313 env->worklist = worklist;
1315 while (!waitq_empty(worklist)) {
1316 ir_entity *ent = waitq_get(worklist);
1318 dump_global(env, ent);
1321 del_waitq(worklist);
1322 env->worklist = NULL;
1325 /************************************************************************/
1327 /* Generate all entities. */
1328 void be_gas_emit_decls(const be_main_env_t *main_env,
1329 int only_emit_marked_entities)
1331 be_gas_decl_env_t env;
1332 memset(&env, 0, sizeof(env));
1334 /* dump global type */
1335 env.section = (be_gas_section_t) -1;
1336 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1337 env.section = GAS_SECTION_TLS;
1338 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1339 env.section = GAS_SECTION_CONSTRUCTORS;
1340 be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1341 only_emit_marked_entities);
1342 env.section = GAS_SECTION_DESTRUCTORS;
1343 be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1344 only_emit_marked_entities);
1346 env.section = GAS_SECTION_PIC_SYMBOLS;
1347 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1348 only_emit_marked_entities);
1350 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1351 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1352 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1353 only_emit_marked_entities);
1354 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1355 be_emit_cstring("\t.subsections_via_symbols\n");
1356 be_emit_write_line();