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,\"w\"",
82 ".section\t.dtors,\"w\"",
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) {
296 void be_gas_emit_entity(ir_entity *entity)
298 if (entity->type == firm_code_type) {
299 ir_label_t label = get_entity_label(entity);
300 be_emit_string(be_gas_block_label_prefix());
301 be_emit_irprintf("%lu", label);
303 be_emit_ident(get_entity_ld_ident(entity));
308 * Return the tarval of an atomic initializer.
310 * @param init a node representing the initializer (on the const code irg)
314 static tarval *get_atomic_init_tv(ir_node *init)
317 ir_mode *mode = get_irn_mode(init);
319 switch (get_irn_opcode(init)) {
322 init = get_Cast_op(init);
326 init = get_Conv_op(init);
330 return get_Const_tarval(init);
333 switch (get_SymConst_kind(init)) {
334 case symconst_type_size:
335 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
337 case symconst_type_align:
338 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
340 case symconst_ofs_ent:
341 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
343 case symconst_enum_const:
344 return get_enumeration_value(get_SymConst_enum(init));
357 * Dump an atomic value.
359 * @param env the gas output environment
360 * @param init a node representing the atomic value (on the const code irg)
362 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
364 ir_mode *mode = get_irn_mode(init);
365 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_gas_emit_entity(ent);
402 case symconst_ofs_ent:
403 ent = get_SymConst_entity(init);
404 be_emit_irprintf("%d", get_entity_offset(ent));
407 case symconst_type_size:
408 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
411 case symconst_type_align:
412 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
415 case symconst_enum_const:
416 tv = get_enumeration_value(get_SymConst_enum(init));
417 dump_arith_tarval(tv, bytes);
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 panic("dump_atomic_init(): unsupported IR-node %+F", init);
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", (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) || get_mode_size_bits(mode) != 8)
542 c = get_tarval_long(tv);
543 if (isgraph(c) || isspace(c))
548 if (i == len - 1 && c != '\0')
552 return found_printable;
556 * Determine if an entity is a string constant
557 * @param ent The entity
558 * @return 1 if it is a string constant, 0 otherwise
560 static int ent_is_string_const(ir_entity *ent)
562 ir_type *type, *element_type;
565 int found_printable = 0;
567 type = get_entity_type(ent);
569 /* if it's an array */
570 if (!is_Array_type(type))
573 element_type = get_array_element_type(type);
575 /* and the array's element type is primitive */
576 if (!is_Primitive_type(element_type))
579 /* and the mode of the element type is an int of
580 * the same size as the byte mode */
581 mode = get_type_mode(element_type);
582 if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
585 if (ent->has_initializer) {
589 /* if it contains only printable chars and a 0 at the end */
590 n = get_compound_ent_n_values(ent);
591 for (i = 0; i < n; ++i) {
592 ir_node *irn = get_compound_ent_value(ent, i);
596 c = (int) get_tarval_long(get_Const_tarval(irn));
598 if (isgraph(c) || isspace(c))
603 if (i == n - 1 && c != '\0')
608 /* then we can emit it as a string constant */
609 return found_printable;
613 * Dump a string constant.
614 * No checks are made!!
616 * @param ent The entity to dump.
618 static void dump_string_cst(ir_entity *ent)
626 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 < output_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.space\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");
803 tv = tarval_convert_to(tv, get_type_mode(type));
805 /* normalize offset */
806 vals += offset_bits >> 3;
808 value_len = get_mode_size_bits(mode);
810 /* combine bits with existing bits */
811 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
812 assert((size_t) (vals - glob_vals) + j < max_vals);
813 assert(vals[j].kind == BITFIELD ||
814 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
815 vals[j].kind = BITFIELD;
816 curr_bits = get_tarval_sub_bits(tv, j);
818 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
820 last_bits = curr_bits;
824 static void dump_ir_initializer(normal_or_bitfield *vals,
825 const ir_initializer_t *initializer,
828 assert((size_t) (vals - glob_vals) < max_vals);
830 switch (get_initializer_kind(initializer)) {
831 case IR_INITIALIZER_NULL:
833 case IR_INITIALIZER_TARVAL: {
836 assert(vals->kind != BITFIELD);
838 vals->v.tarval = get_initializer_tarval_value(initializer);
839 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
840 for (i = 1; i < get_type_size_bytes(type); ++i) {
841 vals[i].kind = NORMAL;
842 vals[i].v.value = NULL;
846 case IR_INITIALIZER_CONST: {
849 assert(vals->kind != BITFIELD);
851 vals->v.value = get_initializer_const_value(initializer);
852 for (i = 1; i < get_type_size_bytes(type); ++i) {
853 vals[i].kind = NORMAL;
854 vals[i].v.value = NULL;
858 case IR_INITIALIZER_COMPOUND: {
860 size_t n = get_initializer_compound_n_entries(initializer);
862 if (is_Array_type(type)) {
863 ir_type *element_type = get_array_element_type(type);
864 size_t skip = get_type_size_bytes(element_type);
865 size_t alignment = get_type_alignment_bytes(element_type);
866 size_t misalign = skip % alignment;
868 skip += alignment - misalign;
871 for (i = 0; i < n; ++i) {
872 ir_initializer_t *sub_initializer
873 = get_initializer_compound_value(initializer, i);
875 dump_ir_initializer(vals, sub_initializer, element_type);
881 assert(is_compound_type(type));
882 n_members = get_compound_n_members(type);
883 for (i = 0; i < n_members; ++i) {
884 ir_entity *member = get_compound_member(type, i);
885 size_t offset = get_entity_offset(member);
886 ir_type *subtype = get_entity_type(member);
887 ir_mode *mode = get_type_mode(subtype);
888 ir_initializer_t *sub_initializer;
890 assert(i < get_initializer_compound_n_entries(initializer));
892 = get_initializer_compound_value(initializer, i);
896 = get_entity_offset_bits_remainder(member);
897 size_t value_len = get_mode_size_bits(mode);
899 if (offset_bits != 0 ||
900 (value_len != 8 && value_len != 16 && value_len != 32
901 && value_len != 64)) {
902 dump_bitfield(&vals[offset], offset_bits,
903 sub_initializer, subtype);
908 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
915 panic("invalid ir_initializer kind found");
918 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
920 const ir_initializer_t *initializer = entity->attr.initializer;
922 normal_or_bitfield *vals;
926 if (initializer_is_string_const(initializer)) {
927 dump_string_initializer(initializer);
931 type = get_entity_type(entity);
932 size = get_initializer_size(initializer, type);
938 * In the worst case, every initializer allocates one byte.
939 * Moreover, initializer might be big, do not allocate on stack.
941 vals = XMALLOCNZ(normal_or_bitfield, size);
948 dump_ir_initializer(vals, initializer, type);
950 /* now write values sorted */
951 for (k = 0; k < size; ) {
954 if (vals[k].kind == NORMAL) {
955 if (vals[k].v.value != NULL) {
956 dump_atomic_init(env, vals[k].v.value);
957 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
961 } else if (vals[k].kind == TARVAL) {
962 tarval *tv = vals[k].v.tarval;
963 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
968 dump_size_type(size);
969 dump_arith_tarval(tv, size);
971 be_emit_write_line();
973 assert(vals[k].kind == BITFIELD);
974 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
975 be_emit_write_line();
979 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
986 be_emit_irprintf("\t.space\t%d\n", space);
987 be_emit_write_line();
994 * Dump an initializer for a compound entity.
996 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
998 normal_or_bitfield *vals;
1000 unsigned k, last_ofs;
1002 if (ent->has_initializer) {
1003 dump_initializer(env, ent);
1007 n = get_compound_ent_n_values(ent);
1009 /* Find the initializer size. Sorrily gcc support a nasty feature:
1010 The last field of a compound may be a flexible array. This allows
1011 initializers bigger than the type size. */
1012 last_ofs = get_type_size_bytes(get_entity_type(ent));
1013 for (i = 0; i < n; ++i) {
1014 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1015 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1016 ir_node *value = get_compound_ent_value(ent, i);
1017 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1019 offset += (value_len + bits_remainder + 7) >> 3;
1021 if (offset > last_ofs) {
1027 * In the worst case, every initializer allocates one byte.
1028 * Moreover, initializer might be big, do not allocate on stack.
1030 vals = XMALLOCNZ(normal_or_bitfield, last_ofs);
1032 /* collect the values and store them at the offsets */
1033 for (i = 0; i < n; ++i) {
1034 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1035 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1036 ir_node *value = get_compound_ent_value(ent, i);
1037 int value_len = get_mode_size_bits(get_irn_mode(value));
1039 assert(offset_bits >= 0);
1041 if (offset_bits != 0 ||
1042 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1043 tarval *tv = get_atomic_init_tv(value);
1044 unsigned char curr_bits, last_bits = 0;
1046 panic("Couldn't get numeric value for bitfield initializer '%s'",
1047 get_entity_ld_name(ent));
1049 /* normalize offset */
1050 offset += offset_bits >> 3;
1053 for (j = 0; value_len + offset_bits > 0; ++j) {
1054 assert(offset + j < last_ofs);
1055 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1056 vals[offset + j].kind = BITFIELD;
1057 curr_bits = get_tarval_sub_bits(tv, j);
1058 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1060 last_bits = curr_bits;
1065 assert(offset < last_ofs);
1066 assert(vals[offset].kind == NORMAL);
1067 for (i = 1; i < value_len / 8; ++i) {
1068 assert(vals[offset + i].v.value == NULL);
1070 vals[offset].v.value = value;
1074 /* now write them sorted */
1075 for (k = 0; k < last_ofs; ) {
1076 int space = 0, skip = 0;
1077 if (vals[k].kind == NORMAL) {
1078 if (vals[k].v.value != NULL) {
1079 dump_atomic_init(env, vals[k].v.value);
1080 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1085 assert(vals[k].kind == BITFIELD);
1086 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1090 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1099 be_emit_irprintf("\t.space\t%d\n", space);
1100 be_emit_write_line();
1106 static void emit_align(unsigned p2alignment)
1108 be_emit_irprintf("\t.p2align\t%u\n", log2_floor(p2alignment));
1109 be_emit_write_line();
1112 static unsigned get_effective_entity_alignment(ir_entity *entity)
1114 unsigned alignment = get_entity_alignment(entity);
1115 if (alignment == 0) {
1116 ir_type *type = get_entity_type(entity);
1117 alignment = get_type_alignment_bytes(type);
1124 * Dump a global entity.
1126 * @param env the gas output environment
1127 * @param ent the entity to be dumped
1129 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1131 ir_type *type = get_entity_type(ent);
1132 ident *ld_ident = get_entity_ld_ident(ent);
1133 unsigned alignment = get_effective_entity_alignment(ent);
1134 int emit_as_common = 0;
1135 be_gas_section_t section = env->section;
1136 ir_variability variability = get_entity_variability(ent);
1137 ir_visibility visibility = get_entity_visibility(ent);
1139 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1142 if (type == firm_code_type) {
1146 if (section != (be_gas_section_t) -1) {
1148 } else if (variability == variability_constant) {
1149 /* a constant entity, put it on the rdata */
1150 section = GAS_SECTION_RODATA;
1151 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1152 && ent_is_string_const(ent)) {
1153 section = GAS_SECTION_CSTRING;
1155 } else if (variability == variability_uninitialized) {
1156 /* uninitialized entity put it in bss segment */
1157 section = GAS_SECTION_COMMON;
1158 if (visibility != visibility_local)
1161 section = GAS_SECTION_DATA;
1164 if (!emit_as_common) {
1165 be_gas_emit_switch_section(section);
1168 be_dbg_variable(ent);
1170 /* global or not global */
1171 if (visibility == visibility_external_visible && !emit_as_common) {
1172 be_emit_cstring(".globl\t");
1173 be_emit_ident(ld_ident);
1175 be_emit_write_line();
1176 } else if (visibility == visibility_external_allocated) {
1177 be_emit_cstring(".globl\t");
1178 be_emit_ident(ld_ident);
1180 be_emit_write_line();
1181 /* we can return now... */
1184 if (!is_po2(alignment))
1185 panic("alignment not a power of 2");
1187 if (alignment > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1188 && section != GAS_SECTION_PIC_SYMBOLS) {
1189 emit_align(alignment);
1192 if (visibility != visibility_external_allocated && !emit_as_common
1193 && be_gas_flavour == GAS_FLAVOUR_ELF) {
1194 be_emit_cstring("\t.type\t");
1195 be_emit_ident(ld_ident);
1196 be_emit_cstring(", @object\n\t.size\t");
1197 be_emit_ident(ld_ident);
1198 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1201 if (!emit_as_common) {
1202 be_emit_ident(ld_ident);
1203 be_emit_cstring(":\n");
1204 be_emit_write_line();
1207 if (variability == variability_uninitialized) {
1208 if (emit_as_common) {
1209 switch (be_gas_flavour) {
1210 case GAS_FLAVOUR_MACH_O:
1211 be_emit_irprintf("\t.comm %s,%u,%u\n",
1212 get_id_str(ld_ident), get_type_size_bytes(type),
1213 log2_floor(alignment));
1215 case GAS_FLAVOUR_ELF:
1216 case GAS_FLAVOUR_YASM:
1217 be_emit_irprintf("\t.comm %s,%u,%u\n",
1218 get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1219 be_emit_write_line();
1221 case GAS_FLAVOUR_MINGW:
1222 be_emit_irprintf("\t.comm %s,%u # %u\n",
1223 get_id_str(ld_ident), get_type_size_bytes(type), alignment);
1224 be_emit_write_line();
1227 } else if (section == GAS_SECTION_PIC_TRAMPOLINES
1228 || section == GAS_SECTION_PIC_SYMBOLS) {
1229 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1230 be_emit_cstring("\t.indirect_symbol ");
1231 be_emit_ident(get_entity_ident(ent));
1233 be_emit_write_line();
1234 if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1235 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1236 be_emit_write_line();
1238 assert(section == GAS_SECTION_PIC_SYMBOLS);
1239 be_emit_cstring("\t.long 0\n");
1240 be_emit_write_line();
1243 panic("PIC trampolines not yet supported in this gas mode");
1246 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1247 be_emit_write_line();
1250 if (is_atomic_entity(ent)) {
1251 dump_atomic_init(env, get_atomic_ent_value(ent));
1253 /* sort_compound_ent_values(ent); */
1255 switch (get_type_tpop_code(get_entity_type(ent))) {
1257 if (ent_is_string_const(ent))
1258 dump_string_cst(ent);
1260 dump_compound_init(env, ent);
1265 dump_compound_init(env, ent);
1268 panic("Unimplemented type kind in dump_global()");
1275 * Dumps declarations of global variables and the initialization code.
1277 * @param gt a global like type, either the global or the TLS one
1278 * @param env an environment
1279 * @param only_emit_marked if non-zero, external allocated entities that do not have
1280 * its visited flag set are ignored
1282 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1283 int only_emit_marked)
1285 int i, n = get_compound_n_members(gt);
1286 waitq *worklist = new_waitq();
1288 if (only_emit_marked) {
1289 for (i = 0; i < n; i++) {
1290 ir_entity *ent = get_compound_member(gt, i);
1291 if (is_entity_backend_marked(ent) ||
1292 get_entity_visibility(ent) != visibility_external_allocated) {
1293 waitq_put(worklist, ent);
1294 set_entity_backend_marked(ent, 1);
1298 for (i = 0; i < n; i++) {
1299 ir_entity *ent = get_compound_member(gt, i);
1300 set_entity_backend_marked(ent, 1);
1301 waitq_put(worklist, ent);
1305 env->worklist = worklist;
1307 while (!waitq_empty(worklist)) {
1308 ir_entity *ent = waitq_get(worklist);
1310 dump_global(env, ent);
1313 del_waitq(worklist);
1314 env->worklist = NULL;
1317 /************************************************************************/
1319 /* Generate all entities. */
1320 void be_gas_emit_decls(const be_main_env_t *main_env,
1321 int only_emit_marked_entities)
1323 be_gas_decl_env_t env;
1324 memset(&env, 0, sizeof(env));
1326 /* dump global type */
1327 env.section = (be_gas_section_t) -1;
1328 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1329 env.section = GAS_SECTION_TLS;
1330 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1331 env.section = GAS_SECTION_CONSTRUCTORS;
1332 be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1333 only_emit_marked_entities);
1334 env.section = GAS_SECTION_DESTRUCTORS;
1335 be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1336 only_emit_marked_entities);
1338 env.section = GAS_SECTION_PIC_SYMBOLS;
1339 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1340 only_emit_marked_entities);
1342 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1343 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1344 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1345 only_emit_marked_entities);
1346 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1347 be_emit_cstring("\t.subsections_via_symbols\n");
1348 be_emit_write_line();