2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Dumps global variables and constants as gas assembler.
23 * @author Christian Wuerdig, Matthias Braun
47 #include "beemitter.h"
48 #include "be_dbgout.h"
50 /** by default, we generate assembler code for the Linux gas */
51 be_gas_flavour_t be_gas_flavour = GAS_FLAVOUR_ELF;
53 static be_gas_section_t current_section = (be_gas_section_t) -1;
56 * Return the pseudo-instruction to be issued for a section switch
57 * depending on the current flavour.
59 * @param section the section to switch to
61 * @return the pseudo-instruction
63 static const char *get_section_name(be_gas_section_t section) {
64 static const char *text[GAS_FLAVOUR_LAST+1][GAS_SECTION_LAST+1] = {
65 { /* GAS_FLAVOUR_ELF */
70 ".section\t.tbss,\"awT\",@nobits",
71 ".section\t.ctors,\"aw\",@progbits",
72 ".section\t.dtors,\"aw\",@progbits",
73 NULL, /* no cstring section */
77 { /* GAS_FLAVOUR_MINGW */
80 ".section .rdata,\"dr\"",
82 ".section\t.tbss,\"awT\",@nobits",
83 ".section\t.ctors,\"aw\",@progbits",
84 ".section\t.dtors,\"aw\",@progbits",
89 { /* GAS_FLAVOUR_YASM */
94 ".section\t.tbss,\"awT\",@nobits",
95 ".section\t.ctors,\"aw\",@progbits",
96 ".section\t.dtors,\"aw\",@progbits",
101 { /* GAS_FLAVOUR_MACH_O */
106 NULL, /* TLS is not supported on Mach-O */
108 NULL, /* TODO: how is this called? */
110 ".section\t__IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5",
111 ".section\t__IMPORT,__pointers,non_lazy_symbol_pointers"
115 assert((int) be_gas_flavour >= 0 && be_gas_flavour <= GAS_FLAVOUR_LAST);
116 assert((int) section >= 0 && section <= GAS_SECTION_LAST);
117 return text[be_gas_flavour][section];
120 void be_gas_emit_switch_section(be_gas_section_t section) {
121 if(current_section == section)
125 be_emit_string(get_section_name(section));
127 be_emit_write_line();
128 current_section = section;
131 void be_gas_emit_function_prolog(ir_entity *entity, unsigned alignment)
133 const char *name = get_entity_ld_name(entity);
134 const char *fill_byte = "";
135 unsigned maximum_skip;
137 be_gas_emit_switch_section(GAS_SECTION_TEXT);
139 /* write the begin line (used by scripts processing the assembler... */
140 be_emit_write_line();
141 be_emit_cstring("# -- Begin ");
142 be_emit_string(name);
144 be_emit_write_line();
146 /* gcc fills space between function with 0x90, no idea if this is needed */
147 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
152 maximum_skip = (1 << alignment) - 1;
153 be_emit_cstring("\t.p2align ");
154 be_emit_irprintf("%u,%s,%u\n", alignment, fill_byte, maximum_skip);
155 be_emit_write_line();
157 if (get_entity_visibility(entity) == visibility_external_visible) {
158 be_emit_cstring(".globl ");
159 be_emit_string(name);
161 be_emit_write_line();
164 switch (be_gas_flavour) {
165 case GAS_FLAVOUR_ELF:
166 be_emit_cstring("\t.type\t");
167 be_emit_string(name);
168 be_emit_cstring(", @function\n");
169 be_emit_write_line();
171 case GAS_FLAVOUR_MINGW:
172 be_emit_cstring("\t.def\t");
173 be_emit_string(name);
174 if (get_entity_visibility(entity) == visibility_external_visible) {
175 be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
177 be_emit_cstring(";\t.scl\t3;\t.type\t32;\t.endef\n");
179 be_emit_write_line();
181 case GAS_FLAVOUR_MACH_O:
182 case GAS_FLAVOUR_YASM:
185 be_emit_string(name);
186 be_emit_cstring(":\n");
187 be_emit_write_line();
190 void be_gas_emit_function_epilog(ir_entity *entity)
192 const char *name = get_entity_ld_name(entity);
194 if (be_gas_flavour == GAS_FLAVOUR_ELF) {
195 be_emit_cstring("\t.size\t");
196 be_emit_string(name);
197 be_emit_cstring(", .-");
198 be_emit_string(name);
200 be_emit_write_line();
203 be_emit_cstring("# -- End ");
204 be_emit_string(name);
206 be_emit_write_line();
210 * An environment containing all needed dumper data.
211 * Currently we create the file completely in memory first, then
212 * write it to the disk. This is an artifact from the old C-generating backend
213 * and even there NOT needed. So we might change it in the future.
215 typedef struct _be_gas_decl_env {
216 const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
217 be_gas_section_t section;
218 waitq *worklist; /**< A worklist we use to place not yet handled entities on. */
221 /************************************************************************/
226 * @param tv the tarval
227 * @param bytes the width of the tarvals value in bytes
229 static void dump_arith_tarval(tarval *tv, int bytes)
233 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
237 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
241 be_emit_irprintf("0x%02x%02x%02x%02x",
242 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
246 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
247 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
248 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
252 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
253 "%02x%02x%02x%02x", get_tarval_sub_bits(tv, 11),
254 get_tarval_sub_bits(tv, 10), get_tarval_sub_bits(tv, 9),
255 get_tarval_sub_bits(tv, 8), get_tarval_sub_bits(tv, 7),
256 get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5),
257 get_tarval_sub_bits(tv, 4), get_tarval_sub_bits(tv, 3),
258 get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1),
259 get_tarval_sub_bits(tv, 0));
263 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
264 "%02x%02x%02x%02x%02x%02x%02x%02x",
265 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
266 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
267 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
268 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
269 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
270 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
271 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
272 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
276 panic("Can't dump a tarval with %d bytes", bytes);
280 * Return the label prefix for labeled blocks.
282 const char *be_gas_block_label_prefix(void) {
287 * Return the label prefix for labeled instructions.
289 const char *be_gas_insn_label_prefix(void) {
296 static void dump_label(ir_label_t label) {
297 be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
301 * Return the tarval of an atomic initializer.
303 * @param init a node representing the initializer (on the const code irg)
307 static tarval *get_atomic_init_tv(ir_node *init)
310 ir_mode *mode = get_irn_mode(init);
312 switch (get_irn_opcode(init)) {
315 init = get_Cast_op(init);
319 init = get_Conv_op(init);
323 return get_Const_tarval(init);
326 switch (get_SymConst_kind(init)) {
327 case symconst_type_size:
328 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
330 case symconst_type_align:
331 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
333 case symconst_ofs_ent:
334 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
336 case symconst_enum_const:
337 return get_enumeration_value(get_SymConst_enum(init));
353 * Dump an atomic value.
355 * @param env the gas output environment
356 * @param init a node representing the atomic value (on the const code irg)
358 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
360 ir_mode *mode = get_irn_mode(init);
361 int bytes = get_mode_size_bytes(mode);
366 init = skip_Id(init);
368 switch (get_irn_opcode(init)) {
370 do_dump_atomic_init(env, get_Cast_op(init));
374 do_dump_atomic_init(env, get_Conv_op(init));
378 tv = get_Const_tarval(init);
380 /* it's a arithmetic value */
381 dump_arith_tarval(tv, bytes);
385 switch (get_SymConst_kind(init)) {
386 case symconst_addr_name:
387 be_emit_ident(get_SymConst_name(init));
390 case symconst_addr_ent:
391 ent = get_SymConst_entity(init);
392 if(!is_entity_backend_marked(ent)) {
393 waitq_put(env->worklist, ent);
394 set_entity_backend_marked(ent, 1);
396 be_emit_ident(get_entity_ld_ident(ent));
399 case symconst_ofs_ent:
400 ent = get_SymConst_entity(init);
401 #if 0 /* not needed, is it? */
402 if(!is_entity_backend_marked(ent)) {
403 waitq_put(env->worklist, ent);
404 set_entity_backend_marked(ent, 1);
407 be_emit_irprintf("%d", get_entity_offset(ent));
410 case symconst_type_size:
411 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
414 case symconst_type_align:
415 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
418 case symconst_enum_const:
419 tv = get_enumeration_value(get_SymConst_enum(init));
420 dump_arith_tarval(tv, bytes);
424 label = get_SymConst_label(init);
429 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
434 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
435 panic("Constant must be int or pointer for '+' to work");
437 do_dump_atomic_init(env, get_Add_left(init));
438 be_emit_cstring(" + ");
439 do_dump_atomic_init(env, get_Add_right(init));
443 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
444 panic("Constant must be int or pointer for '-' to work");
446 do_dump_atomic_init(env, get_Sub_left(init));
447 be_emit_cstring(" - ");
448 do_dump_atomic_init(env, get_Sub_right(init));
452 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
453 panic("Constant must be int or pointer for '*' to work");
455 do_dump_atomic_init(env, get_Mul_left(init));
456 be_emit_cstring(" * ");
457 do_dump_atomic_init(env, get_Mul_right(init));
461 assert(0 && "dump_atomic_init(): unknown IR-node");
466 * Dumps the type for given size (.byte, .long, ...)
468 * @param size the size in bytes
470 static void dump_size_type(size_t size) {
473 be_emit_cstring("\t.byte\t");
477 be_emit_cstring("\t.word\t");
481 be_emit_cstring("\t.long\t");
485 be_emit_cstring("\t.quad\t");
490 /* handled in arith */
494 be_emit_cstring("\t.octa\t");
498 panic("Try to dump a type with %u bytes", (unsigned)size);
503 * Emit an atomic value.
505 * @param env the gas output environment
506 * @param init a node representing the atomic value (on the const code irg)
508 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
510 ir_mode *mode = get_irn_mode(init);
511 int bytes = get_mode_size_bytes(mode);
513 dump_size_type(bytes);
514 do_dump_atomic_init(env, init);
516 be_emit_write_line();
519 /************************************************************************/
520 /* Routines to dump global variables */
521 /************************************************************************/
523 static int initializer_is_string_const(const ir_initializer_t *initializer)
526 int found_printable = 0;
528 if(initializer->kind != IR_INITIALIZER_COMPOUND)
531 len = initializer->compound.n_initializers;
534 for(i = 0; i < len; ++i) {
538 ir_initializer_t *sub_initializer
539 = initializer->compound.initializers[i];
541 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
544 tv = sub_initializer->tarval.value;
545 mode = get_tarval_mode(tv);
547 if (!mode_is_int(mode)
548 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
551 c = get_tarval_long(tv);
552 if (isgraph(c) || isspace(c))
557 if (i == len - 1 && c != '\0')
561 return found_printable;
565 * Determine if an entity is a string constant
566 * @param ent The entity
567 * @return 1 if it is a string constant, 0 otherwise
569 static int ent_is_string_const(ir_entity *ent)
571 ir_type *type, *element_type;
574 int found_printable = 0;
576 type = get_entity_type(ent);
578 /* if it's an array */
579 if (!is_Array_type(type))
582 element_type = get_array_element_type(type);
584 /* and the array's element type is primitive */
585 if (!is_Primitive_type(element_type))
588 /* and the mode of the element type is an int of
589 * the same size as the byte mode */
590 mode = get_type_mode(element_type);
591 if (!mode_is_int(mode)
592 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
595 if(ent->has_initializer) {
599 /* if it contains only printable chars and a 0 at the end */
600 n = get_compound_ent_n_values(ent);
601 for (i = 0; i < n; ++i) {
602 ir_node *irn = get_compound_ent_value(ent, i);
606 c = (int) get_tarval_long(get_Const_tarval(irn));
608 if (isgraph(c) || isspace(c))
613 if (i == n - 1 && c != '\0')
618 /* then we can emit it as a string constant */
619 return found_printable;
623 * Dump a string constant.
624 * No checks are made!!
626 * @param ent The entity to dump.
628 static void dump_string_cst(ir_entity *ent)
635 len = get_compound_ent_n_values(ent);
636 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
637 be_emit_cstring("\t.ascii \"");
639 be_emit_cstring("\t.string \"");
643 for (i = 0; i < len; ++i) {
647 irn = get_compound_ent_value(ent, i);
648 c = (int) get_tarval_long(get_Const_tarval(irn));
651 case '"' : be_emit_cstring("\\\""); break;
652 case '\n': be_emit_cstring("\\n"); break;
653 case '\r': be_emit_cstring("\\r"); break;
654 case '\t': be_emit_cstring("\\t"); break;
655 case '\\': be_emit_cstring("\\\\"); break;
660 be_emit_irprintf("\\%o", c);
664 be_emit_cstring("\"\n");
665 be_emit_write_line();
667 type = get_entity_type(ent);
668 type_size = get_type_size_bytes(type);
669 remaining_space = type_size - len;
670 assert(remaining_space >= 0);
671 if(remaining_space > 0) {
672 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
676 static void dump_string_initializer(const ir_initializer_t *initializer)
680 len = initializer->compound.n_initializers;
681 if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
682 be_emit_cstring("\t.ascii \"");
684 be_emit_cstring("\t.string \"");
688 for(i = 0; i < len; ++i) {
689 const ir_initializer_t *sub_initializer
690 = get_initializer_compound_value(initializer, i);
692 tarval *tv = get_initializer_tarval_value(sub_initializer);
693 int c = get_tarval_long(tv);
696 case '"' : be_emit_cstring("\\\""); break;
697 case '\n': be_emit_cstring("\\n"); break;
698 case '\r': be_emit_cstring("\\r"); break;
699 case '\t': be_emit_cstring("\\t"); break;
700 case '\\': be_emit_cstring("\\\\"); break;
705 be_emit_irprintf("\\%o", c);
709 be_emit_cstring("\"\n");
710 be_emit_write_line();
713 enum normal_or_bitfield_kind {
720 enum normal_or_bitfield_kind kind;
724 unsigned char bf_val;
726 } normal_or_bitfield;
728 static int is_type_variable_size(ir_type *type)
735 static size_t get_initializer_size(const ir_initializer_t *initializer,
738 switch(get_initializer_kind(initializer)) {
739 case IR_INITIALIZER_TARVAL: {
740 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
741 return get_type_size_bytes(type);
743 case IR_INITIALIZER_CONST:
744 case IR_INITIALIZER_NULL:
745 return get_type_size_bytes(type);
746 case IR_INITIALIZER_COMPOUND: {
747 if(!is_type_variable_size(type)) {
748 return get_type_size_bytes(type);
751 = get_initializer_compound_n_entries(initializer);
753 unsigned initializer_size = get_type_size_bytes(type);
754 for(i = 0; i < n_entries; ++i) {
755 ir_entity *entity = get_compound_member(type, i);
756 ir_type *type = get_entity_type(entity);
758 const ir_initializer_t *sub_initializer
759 = get_initializer_compound_value(initializer, i);
761 unsigned offset = get_entity_offset(entity);
762 unsigned size = get_initializer_size(sub_initializer, type);
764 if(offset + size > initializer_size) {
765 initializer_size = offset + size;
768 return initializer_size;
773 panic("found invalid initializer");
777 static normal_or_bitfield *glob_vals;
778 static size_t max_vals;
781 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
782 const ir_initializer_t *initializer, ir_type *type)
784 unsigned char last_bits = 0;
785 ir_mode *mode = get_type_mode(type);
787 unsigned char curr_bits;
791 switch(get_initializer_kind(initializer)) {
792 case IR_INITIALIZER_NULL:
794 case IR_INITIALIZER_TARVAL:
795 tv = get_initializer_tarval_value(initializer);
797 case IR_INITIALIZER_CONST: {
798 ir_node *node = get_initializer_const_value(initializer);
799 if(!is_Const(node)) {
800 panic("bitfield initializer not a Const node");
802 tv = get_Const_tarval(node);
805 case IR_INITIALIZER_COMPOUND:
806 panic("bitfield initializer is compound");
809 panic("Couldn't get numeric value for bitfield initializer");
812 /* normalize offset */
813 vals += offset_bits >> 3;
815 value_len = get_mode_size_bits(mode);
817 /* combine bits with existing bits */
818 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
819 assert((size_t) (vals - glob_vals) + j < max_vals);
820 assert(vals[j].kind == BITFIELD ||
821 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
822 vals[j].kind = BITFIELD;
823 curr_bits = get_tarval_sub_bits(tv, j);
825 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
827 last_bits = curr_bits;
831 static void dump_ir_initializer(normal_or_bitfield *vals,
832 const ir_initializer_t *initializer,
835 assert((size_t) (vals - glob_vals) < max_vals);
837 switch(get_initializer_kind(initializer)) {
838 case IR_INITIALIZER_NULL:
840 case IR_INITIALIZER_TARVAL: {
843 assert(vals->kind != BITFIELD);
845 vals->v.tarval = get_initializer_tarval_value(initializer);
846 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
847 for(i = 1; i < get_type_size_bytes(type); ++i) {
848 vals[i].kind = NORMAL;
849 vals[i].v.value = NULL;
853 case IR_INITIALIZER_CONST: {
856 assert(vals->kind != BITFIELD);
858 vals->v.value = get_initializer_const_value(initializer);
859 for(i = 1; i < get_type_size_bytes(type); ++i) {
860 vals[i].kind = NORMAL;
861 vals[i].v.value = NULL;
865 case IR_INITIALIZER_COMPOUND: {
867 size_t n = get_initializer_compound_n_entries(initializer);
869 if(is_Array_type(type)) {
870 ir_type *element_type = get_array_element_type(type);
871 size_t skip = get_type_size_bytes(element_type);
872 size_t alignment = get_type_alignment_bytes(element_type);
873 size_t misalign = skip % alignment;
875 skip += alignment - misalign;
878 for(i = 0; i < n; ++i) {
879 ir_initializer_t *sub_initializer
880 = get_initializer_compound_value(initializer, i);
882 dump_ir_initializer(vals, sub_initializer, element_type);
888 assert(is_compound_type(type));
889 n_members = get_compound_n_members(type);
890 for(i = 0; i < n_members; ++i) {
891 ir_entity *member = get_compound_member(type, i);
892 size_t offset = get_entity_offset(member);
893 ir_type *subtype = get_entity_type(member);
894 ir_mode *mode = get_type_mode(subtype);
895 ir_initializer_t *sub_initializer;
897 assert(i < get_initializer_compound_n_entries(initializer));
899 = get_initializer_compound_value(initializer, i);
903 = get_entity_offset_bits_remainder(member);
904 size_t value_len = get_mode_size_bits(mode);
906 if(offset_bits != 0 ||
907 (value_len != 8 && value_len != 16 && value_len != 32
908 && value_len != 64)) {
909 dump_bitfield(&vals[offset], offset_bits,
910 sub_initializer, subtype);
915 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
922 panic("invalid ir_initializer kind found");
925 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
927 const ir_initializer_t *initializer = entity->attr.initializer;
929 normal_or_bitfield *vals;
933 if(initializer_is_string_const(initializer)) {
934 dump_string_initializer(initializer);
938 type = get_entity_type(entity);
939 size = get_initializer_size(initializer, type);
945 * In the worst case, every initializer allocates one byte.
946 * Moreover, initializer might be big, do not allocate on stack.
948 vals = xcalloc(size, sizeof(vals[0]));
955 dump_ir_initializer(vals, initializer, type);
957 /* now write values sorted */
958 for (k = 0; k < size; ) {
961 if (vals[k].kind == NORMAL) {
962 if(vals[k].v.value != NULL) {
963 dump_atomic_init(env, vals[k].v.value);
964 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
968 } else if(vals[k].kind == TARVAL) {
969 tarval *tv = vals[k].v.tarval;
970 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
975 dump_size_type(size);
976 dump_arith_tarval(tv, size);
978 be_emit_write_line();
980 assert(vals[k].kind == BITFIELD);
981 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
982 be_emit_write_line();
986 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
993 be_emit_irprintf("\t.skip\t%d\n", space);
994 be_emit_write_line();
1001 * Dump an initializer for a compound entity.
1003 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
1005 normal_or_bitfield *vals;
1007 unsigned k, last_ofs;
1009 if(ent->has_initializer) {
1010 dump_initializer(env, ent);
1014 n = get_compound_ent_n_values(ent);
1016 /* Find the initializer size. Sorrily gcc support a nasty feature:
1017 The last field of a compound may be a flexible array. This allows
1018 initializers bigger than the type size. */
1019 last_ofs = get_type_size_bytes(get_entity_type(ent));
1020 for (i = 0; i < n; ++i) {
1021 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1022 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1023 ir_node *value = get_compound_ent_value(ent, i);
1024 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1026 offset += (value_len + bits_remainder + 7) >> 3;
1028 if (offset > last_ofs) {
1034 * In the worst case, every initializer allocates one byte.
1035 * Moreover, initializer might be big, do not allocate on stack.
1037 vals = xcalloc(last_ofs, sizeof(vals[0]));
1039 /* collect the values and store them at the offsets */
1040 for (i = 0; i < n; ++i) {
1041 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1042 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1043 ir_node *value = get_compound_ent_value(ent, i);
1044 int value_len = get_mode_size_bits(get_irn_mode(value));
1046 assert(offset_bits >= 0);
1048 if (offset_bits != 0 ||
1049 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1050 tarval *tv = get_atomic_init_tv(value);
1051 unsigned char curr_bits, last_bits = 0;
1053 panic("Couldn't get numeric value for bitfield initializer '%s'",
1054 get_entity_ld_name(ent));
1056 /* normalize offset */
1057 offset += offset_bits >> 3;
1060 for (j = 0; value_len + offset_bits > 0; ++j) {
1061 assert(offset + j < last_ofs);
1062 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1063 vals[offset + j].kind = BITFIELD;
1064 curr_bits = get_tarval_sub_bits(tv, j);
1065 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1067 last_bits = curr_bits;
1072 assert(offset < last_ofs);
1073 assert(vals[offset].kind == NORMAL);
1074 for (i = 1; i < value_len / 8; ++i) {
1075 assert(vals[offset + i].v.value == NULL);
1077 vals[offset].v.value = value;
1081 /* now write them sorted */
1082 for (k = 0; k < last_ofs; ) {
1083 int space = 0, skip = 0;
1084 if (vals[k].kind == NORMAL) {
1085 if(vals[k].v.value != NULL) {
1086 dump_atomic_init(env, vals[k].v.value);
1087 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1092 assert(vals[k].kind == BITFIELD);
1093 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1097 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1106 be_emit_irprintf("\t.skip\t%d\n", space);
1107 be_emit_write_line();
1113 static void emit_align(unsigned alignment)
1115 if (!is_po2(alignment))
1116 panic("alignment not a power of 2");
1118 be_emit_irprintf("\t.p2align\t%u\n", log2_floor(alignment));
1119 be_emit_write_line();
1123 * Dump a global entity.
1125 * @param env the gas output environment
1126 * @param ent the entity to be dumped
1128 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1130 ir_type *type = get_entity_type(ent);
1131 ident *ld_ident = get_entity_ld_ident(ent);
1132 unsigned align = get_type_alignment_bytes(type);
1133 int emit_as_common = 0;
1134 be_gas_section_t section = env->section;
1135 ir_variability variability = get_entity_variability(ent);
1136 ir_visibility visibility = get_entity_visibility(ent);
1138 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1142 if (section != (be_gas_section_t) -1) {
1144 } else if (variability == variability_constant) {
1145 /* a constant entity, put it on the rdata */
1146 section = GAS_SECTION_RODATA;
1147 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1148 && ent_is_string_const(ent)) {
1149 section = GAS_SECTION_CSTRING;
1151 } else if (variability == variability_uninitialized) {
1152 /* uninitialized entity put it in bss segment */
1153 section = GAS_SECTION_COMMON;
1154 if (visibility != visibility_local)
1157 section = GAS_SECTION_DATA;
1160 if(!emit_as_common) {
1161 be_gas_emit_switch_section(section);
1164 be_dbg_variable(ent);
1166 /* global or not global */
1167 if (visibility == visibility_external_visible && !emit_as_common) {
1168 be_emit_cstring(".globl\t");
1169 be_emit_ident(ld_ident);
1171 be_emit_write_line();
1172 } else if(visibility == visibility_external_allocated) {
1173 be_emit_cstring(".globl\t");
1174 be_emit_ident(ld_ident);
1176 be_emit_write_line();
1177 /* we can return now... */
1181 if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1182 && section != GAS_SECTION_PIC_SYMBOLS) {
1186 if (visibility != visibility_external_allocated && !emit_as_common
1187 && be_gas_flavour == GAS_FLAVOUR_ELF) {
1188 be_emit_cstring("\t.type\t");
1189 be_emit_ident(ld_ident);
1190 be_emit_cstring(", @object\n\t.size\t");
1191 be_emit_ident(ld_ident);
1192 be_emit_irprintf(", %u\n", get_type_size_bytes(type));
1195 if (!emit_as_common) {
1196 be_emit_ident(ld_ident);
1197 be_emit_cstring(":\n");
1198 be_emit_write_line();
1201 if (variability == variability_uninitialized) {
1202 if (emit_as_common) {
1203 switch (be_gas_flavour) {
1204 case GAS_FLAVOUR_ELF:
1205 case GAS_FLAVOUR_MACH_O:
1206 case GAS_FLAVOUR_YASM:
1207 be_emit_irprintf("\t.comm %s,%u,%u\n",
1208 get_id_str(ld_ident), get_type_size_bytes(type), align);
1209 be_emit_write_line();
1211 case GAS_FLAVOUR_MINGW:
1212 be_emit_irprintf("\t.comm %s,%u # %u\n",
1213 get_id_str(ld_ident), get_type_size_bytes(type), align);
1214 be_emit_write_line();
1217 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1218 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1219 be_emit_cstring("\t.indirect_symbol ");
1220 be_emit_ident(get_entity_ident(ent));
1222 be_emit_write_line();
1223 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1224 be_emit_write_line();
1226 panic("PIC trampolines not yet supported in this gas mode");
1229 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1230 be_emit_write_line();
1233 if (is_atomic_entity(ent)) {
1234 dump_atomic_init(env, get_atomic_ent_value(ent));
1236 /* sort_compound_ent_values(ent); */
1238 switch (get_type_tpop_code(get_entity_type(ent))) {
1240 if (ent_is_string_const(ent))
1241 dump_string_cst(ent);
1243 dump_compound_init(env, ent);
1248 dump_compound_init(env, ent);
1258 * Dumps declarations of global variables and the initialization code.
1260 * @param gt a global like type, either the global or the TLS one
1261 * @param env an environment
1262 * @param only_emit_marked if non-zero, external allocated entities that do not have
1263 * its visited flag set are ignored
1265 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1266 int only_emit_marked)
1268 int i, n = get_compound_n_members(gt);
1269 waitq *worklist = new_waitq();
1271 if (only_emit_marked) {
1272 for (i = 0; i < n; i++) {
1273 ir_entity *ent = get_compound_member(gt, i);
1274 if (is_entity_backend_marked(ent) ||
1275 get_entity_visibility(ent) != visibility_external_allocated) {
1276 waitq_put(worklist, ent);
1277 set_entity_backend_marked(ent, 1);
1281 for (i = 0; i < n; i++) {
1282 ir_entity *ent = get_compound_member(gt, i);
1283 set_entity_backend_marked(ent, 1);
1284 waitq_put(worklist, ent);
1288 env->worklist = worklist;
1290 while (!waitq_empty(worklist)) {
1291 ir_entity *ent = waitq_get(worklist);
1293 dump_global(env, ent);
1296 del_waitq(worklist);
1297 env->worklist = NULL;
1300 /************************************************************************/
1302 /* Generate all entities. */
1303 void be_gas_emit_decls(const be_main_env_t *main_env,
1304 int only_emit_marked_entities)
1306 be_gas_decl_env_t env;
1307 memset(&env, 0, sizeof(env));
1309 env.main_env = main_env;
1311 /* dump global type */
1312 env.section = (be_gas_section_t) -1;
1313 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1314 env.section = GAS_SECTION_TLS;
1315 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1316 env.section = GAS_SECTION_CONSTRUCTORS;
1317 be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1318 only_emit_marked_entities);
1319 env.section = GAS_SECTION_DESTRUCTORS;
1320 be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1321 only_emit_marked_entities);
1323 env.section = GAS_SECTION_PIC_SYMBOLS;
1324 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1325 only_emit_marked_entities);
1327 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1328 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1329 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1330 only_emit_marked_entities);
1331 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1332 be_emit_cstring("\t.subsections_via_symbols\n");
1333 be_emit_write_line();