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 be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
175 be_emit_write_line();
177 case GAS_FLAVOUR_MACH_O:
178 case GAS_FLAVOUR_YASM:
181 be_emit_string(name);
182 be_emit_cstring(":\n");
183 be_emit_write_line();
186 void be_gas_emit_function_epilog(ir_entity *entity)
188 const char *name = get_entity_ld_name(entity);
190 if (be_gas_flavour == GAS_FLAVOUR_ELF) {
191 be_emit_cstring("\t.size\t");
192 be_emit_string(name);
193 be_emit_cstring(", .-");
194 be_emit_string(name);
196 be_emit_write_line();
199 be_emit_cstring("# -- End ");
200 be_emit_string(name);
202 be_emit_write_line();
206 * An environment containing all needed dumper data.
207 * Currently we create the file completely in memory first, then
208 * write it to the disk. This is an artifact from the old C-generating backend
209 * and even there NOT needed. So we might change it in the future.
211 typedef struct _be_gas_decl_env {
212 const be_main_env_t *main_env; /**< The main backend environment, used for it's debug handle. */
213 be_gas_section_t section;
214 waitq *worklist; /**< A worklist we use to place not yet handled entities on. */
217 /************************************************************************/
222 * @param tv the tarval
223 * @param bytes the width of the tarvals value in bytes
225 static void dump_arith_tarval(tarval *tv, int bytes)
229 be_emit_irprintf("0x%02x", get_tarval_sub_bits(tv, 0));
233 be_emit_irprintf("0x%02x%02x", get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
237 be_emit_irprintf("0x%02x%02x%02x%02x",
238 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
242 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x",
243 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
244 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
248 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
249 "%02x%02x%02x%02x", get_tarval_sub_bits(tv, 11),
250 get_tarval_sub_bits(tv, 10), get_tarval_sub_bits(tv, 9),
251 get_tarval_sub_bits(tv, 8), get_tarval_sub_bits(tv, 7),
252 get_tarval_sub_bits(tv, 6), get_tarval_sub_bits(tv, 5),
253 get_tarval_sub_bits(tv, 4), get_tarval_sub_bits(tv, 3),
254 get_tarval_sub_bits(tv, 2), get_tarval_sub_bits(tv, 1),
255 get_tarval_sub_bits(tv, 0));
259 be_emit_irprintf("0x%02x%02x%02x%02x%02x%02x%02x%02x"
260 "%02x%02x%02x%02x%02x%02x%02x%02x",
261 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
262 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
263 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
264 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
265 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
266 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
267 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
268 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0));
272 panic("Can't dump a tarval with %d bytes\n", bytes);
276 * Return the label prefix for labeled blocks.
278 const char *be_gas_block_label_prefix(void) {
283 * Return the label prefix for labeled instructions.
285 const char *be_gas_insn_label_prefix(void) {
292 static void dump_label(ir_label_t label) {
293 be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
297 * Return the tarval of an atomic initializer.
299 * @param init a node representing the initializer (on the const code irg)
303 static tarval *get_atomic_init_tv(ir_node *init)
306 ir_mode *mode = get_irn_mode(init);
308 switch (get_irn_opcode(init)) {
311 init = get_Cast_op(init);
315 init = get_Conv_op(init);
319 return get_Const_tarval(init);
322 switch (get_SymConst_kind(init)) {
323 case symconst_type_size:
324 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
326 case symconst_type_align:
327 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
329 case symconst_ofs_ent:
330 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
332 case symconst_enum_const:
333 return get_enumeration_value(get_SymConst_enum(init));
349 * Dump an atomic value.
351 * @param env the gas output environment
352 * @param init a node representing the atomic value (on the const code irg)
354 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
356 ir_mode *mode = get_irn_mode(init);
357 int bytes = get_mode_size_bytes(mode);
362 init = skip_Id(init);
364 switch (get_irn_opcode(init)) {
366 do_dump_atomic_init(env, get_Cast_op(init));
370 do_dump_atomic_init(env, get_Conv_op(init));
374 tv = get_Const_tarval(init);
376 /* it's a arithmetic value */
377 dump_arith_tarval(tv, bytes);
381 switch (get_SymConst_kind(init)) {
382 case symconst_addr_name:
383 be_emit_ident(get_SymConst_name(init));
386 case symconst_addr_ent:
387 ent = get_SymConst_entity(init);
388 if(!is_entity_backend_marked(ent)) {
389 waitq_put(env->worklist, ent);
390 set_entity_backend_marked(ent, 1);
392 be_emit_ident(get_entity_ld_ident(ent));
395 case symconst_ofs_ent:
396 ent = get_SymConst_entity(init);
397 #if 0 /* not needed, is it? */
398 if(!is_entity_backend_marked(ent)) {
399 waitq_put(env->worklist, ent);
400 set_entity_backend_marked(ent, 1);
403 be_emit_irprintf("%d", get_entity_offset(ent));
406 case symconst_type_size:
407 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
410 case symconst_type_align:
411 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
414 case symconst_enum_const:
415 tv = get_enumeration_value(get_SymConst_enum(init));
416 dump_arith_tarval(tv, bytes);
420 label = get_SymConst_label(init);
425 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
430 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
431 panic("Constant must be int or pointer for '+' to work");
433 do_dump_atomic_init(env, get_Add_left(init));
434 be_emit_cstring(" + ");
435 do_dump_atomic_init(env, get_Add_right(init));
439 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
440 panic("Constant must be int or pointer for '-' to work");
442 do_dump_atomic_init(env, get_Sub_left(init));
443 be_emit_cstring(" - ");
444 do_dump_atomic_init(env, get_Sub_right(init));
448 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
449 panic("Constant must be int or pointer for '*' to work");
451 do_dump_atomic_init(env, get_Mul_left(init));
452 be_emit_cstring(" * ");
453 do_dump_atomic_init(env, get_Mul_right(init));
457 assert(0 && "dump_atomic_init(): unknown IR-node");
462 * Dumps the type for given size (.byte, .long, ...)
464 * @param size the size in bytes
466 static void dump_size_type(size_t size) {
469 be_emit_cstring("\t.byte\t");
473 be_emit_cstring("\t.word\t");
477 be_emit_cstring("\t.long\t");
481 be_emit_cstring("\t.quad\t");
486 /* handled in arith */
490 be_emit_cstring("\t.octa\t");
494 panic("Try to dump a type with %u bytes\n", (unsigned) size);
499 * Emit an atomic value.
501 * @param env the gas output environment
502 * @param init a node representing the atomic value (on the const code irg)
504 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
506 ir_mode *mode = get_irn_mode(init);
507 int bytes = get_mode_size_bytes(mode);
509 dump_size_type(bytes);
510 do_dump_atomic_init(env, init);
512 be_emit_write_line();
515 /************************************************************************/
516 /* Routines to dump global variables */
517 /************************************************************************/
519 static int initializer_is_string_const(const ir_initializer_t *initializer)
522 int found_printable = 0;
524 if(initializer->kind != IR_INITIALIZER_COMPOUND)
527 len = initializer->compound.n_initializers;
530 for(i = 0; i < len; ++i) {
534 ir_initializer_t *sub_initializer
535 = initializer->compound.initializers[i];
537 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
540 tv = sub_initializer->tarval.value;
541 mode = get_tarval_mode(tv);
543 if (!mode_is_int(mode)
544 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
547 c = get_tarval_long(tv);
548 if (isgraph(c) || isspace(c))
553 if (i == len - 1 && c != '\0')
557 return found_printable;
561 * Determine if an entity is a string constant
562 * @param ent The entity
563 * @return 1 if it is a string constant, 0 otherwise
565 static int ent_is_string_const(ir_entity *ent)
567 ir_type *type, *element_type;
570 int found_printable = 0;
572 type = get_entity_type(ent);
574 /* if it's an array */
575 if (!is_Array_type(type))
578 element_type = get_array_element_type(type);
580 /* and the array's element type is primitive */
581 if (!is_Primitive_type(element_type))
584 /* and the mode of the element type is an int of
585 * the same size as the byte mode */
586 mode = get_type_mode(element_type);
587 if (!mode_is_int(mode)
588 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
591 if(ent->has_initializer) {
595 /* if it contains only printable chars and a 0 at the end */
596 n = get_compound_ent_n_values(ent);
597 for (i = 0; i < n; ++i) {
598 ir_node *irn = get_compound_ent_value(ent, i);
602 c = (int) get_tarval_long(get_Const_tarval(irn));
604 if (isgraph(c) || isspace(c))
609 if (i == n - 1 && c != '\0')
614 /* then we can emit it as a string constant */
615 return found_printable;
619 * Dump a string constant.
620 * No checks are made!!
622 * @param ent The entity to dump.
624 static void dump_string_cst(ir_entity *ent)
631 len = get_compound_ent_n_values(ent);
632 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
633 be_emit_cstring("\t.ascii \"");
635 be_emit_cstring("\t.string \"");
639 for (i = 0; i < len; ++i) {
643 irn = get_compound_ent_value(ent, i);
644 c = (int) get_tarval_long(get_Const_tarval(irn));
647 case '"' : be_emit_cstring("\\\""); break;
648 case '\n': be_emit_cstring("\\n"); break;
649 case '\r': be_emit_cstring("\\r"); break;
650 case '\t': be_emit_cstring("\\t"); break;
651 case '\\': be_emit_cstring("\\\\"); break;
656 be_emit_irprintf("\\%o", c);
660 be_emit_cstring("\"\n");
661 be_emit_write_line();
663 type = get_entity_type(ent);
664 type_size = get_type_size_bytes(type);
665 remaining_space = type_size - len;
666 assert(remaining_space >= 0);
667 if(remaining_space > 0) {
668 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
672 static void dump_string_initializer(const ir_initializer_t *initializer)
676 len = initializer->compound.n_initializers;
677 if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
678 be_emit_cstring("\t.ascii \"");
680 be_emit_cstring("\t.string \"");
684 for(i = 0; i < len; ++i) {
685 const ir_initializer_t *sub_initializer
686 = get_initializer_compound_value(initializer, i);
688 tarval *tv = get_initializer_tarval_value(sub_initializer);
689 int c = get_tarval_long(tv);
692 case '"' : be_emit_cstring("\\\""); break;
693 case '\n': be_emit_cstring("\\n"); break;
694 case '\r': be_emit_cstring("\\r"); break;
695 case '\t': be_emit_cstring("\\t"); break;
696 case '\\': be_emit_cstring("\\\\"); break;
701 be_emit_irprintf("\\%o", c);
705 be_emit_cstring("\"\n");
706 be_emit_write_line();
709 enum normal_or_bitfield_kind {
716 enum normal_or_bitfield_kind kind;
720 unsigned char bf_val;
722 } normal_or_bitfield;
724 static int is_type_variable_size(ir_type *type)
731 static size_t get_initializer_size(const ir_initializer_t *initializer,
734 switch(get_initializer_kind(initializer)) {
735 case IR_INITIALIZER_TARVAL: {
736 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
737 return get_type_size_bytes(type);
739 case IR_INITIALIZER_CONST:
740 case IR_INITIALIZER_NULL:
741 return get_type_size_bytes(type);
742 case IR_INITIALIZER_COMPOUND: {
743 if(!is_type_variable_size(type)) {
744 return get_type_size_bytes(type);
747 = get_initializer_compound_n_entries(initializer);
749 unsigned initializer_size = get_type_size_bytes(type);
750 for(i = 0; i < n_entries; ++i) {
751 ir_entity *entity = get_compound_member(type, i);
752 ir_type *type = get_entity_type(entity);
754 const ir_initializer_t *sub_initializer
755 = get_initializer_compound_value(initializer, i);
757 unsigned offset = get_entity_offset(entity);
758 unsigned size = get_initializer_size(sub_initializer, type);
760 if(offset + size > initializer_size) {
761 initializer_size = offset + size;
764 return initializer_size;
769 panic("found invalid initializer");
773 static normal_or_bitfield *glob_vals;
774 static size_t max_vals;
777 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
778 const ir_initializer_t *initializer, ir_type *type)
780 unsigned char last_bits = 0;
781 ir_mode *mode = get_type_mode(type);
783 unsigned char curr_bits;
787 switch(get_initializer_kind(initializer)) {
788 case IR_INITIALIZER_NULL:
790 case IR_INITIALIZER_TARVAL:
791 tv = get_initializer_tarval_value(initializer);
793 case IR_INITIALIZER_CONST: {
794 ir_node *node = get_initializer_const_value(initializer);
795 if(!is_Const(node)) {
796 panic("bitfield initializer not a Const node");
798 tv = get_Const_tarval(node);
801 case IR_INITIALIZER_COMPOUND:
802 panic("bitfield initializer is compound");
805 panic("Couldn't get numeric value for bitfield initializer\n");
808 /* normalize offset */
809 vals += offset_bits >> 3;
811 value_len = get_mode_size_bits(mode);
813 /* combine bits with existing bits */
814 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
815 assert((size_t) (vals - glob_vals) + j < max_vals);
816 assert(vals[j].kind == BITFIELD ||
817 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
818 vals[j].kind = BITFIELD;
819 curr_bits = get_tarval_sub_bits(tv, j);
821 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
823 last_bits = curr_bits;
827 static void dump_ir_initializer(normal_or_bitfield *vals,
828 const ir_initializer_t *initializer,
831 assert((size_t) (vals - glob_vals) < max_vals);
833 switch(get_initializer_kind(initializer)) {
834 case IR_INITIALIZER_NULL:
836 case IR_INITIALIZER_TARVAL: {
839 assert(vals->kind != BITFIELD);
841 vals->v.tarval = get_initializer_tarval_value(initializer);
842 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
843 for(i = 1; i < get_type_size_bytes(type); ++i) {
844 vals[i].kind = NORMAL;
845 vals[i].v.value = NULL;
849 case IR_INITIALIZER_CONST: {
852 assert(vals->kind != BITFIELD);
854 vals->v.value = get_initializer_const_value(initializer);
855 for(i = 1; i < get_type_size_bytes(type); ++i) {
856 vals[i].kind = NORMAL;
857 vals[i].v.value = NULL;
861 case IR_INITIALIZER_COMPOUND: {
863 size_t n = get_initializer_compound_n_entries(initializer);
865 if(is_Array_type(type)) {
866 ir_type *element_type = get_array_element_type(type);
867 size_t skip = get_type_size_bytes(element_type);
868 size_t alignment = get_type_alignment_bytes(element_type);
869 size_t misalign = skip % alignment;
871 skip += alignment - misalign;
874 for(i = 0; i < n; ++i) {
875 ir_initializer_t *sub_initializer
876 = get_initializer_compound_value(initializer, i);
878 dump_ir_initializer(vals, sub_initializer, element_type);
884 assert(is_compound_type(type));
885 n_members = get_compound_n_members(type);
886 for(i = 0; i < n_members; ++i) {
887 ir_entity *member = get_compound_member(type, i);
888 size_t offset = get_entity_offset(member);
889 ir_type *subtype = get_entity_type(member);
890 ir_mode *mode = get_type_mode(subtype);
891 ir_initializer_t *sub_initializer;
893 assert(i < get_initializer_compound_n_entries(initializer));
895 = get_initializer_compound_value(initializer, i);
899 = get_entity_offset_bits_remainder(member);
900 size_t value_len = get_mode_size_bits(mode);
902 if(offset_bits != 0 ||
903 (value_len != 8 && value_len != 16 && value_len != 32
904 && value_len != 64)) {
905 dump_bitfield(&vals[offset], offset_bits,
906 sub_initializer, subtype);
911 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
918 panic("invalid ir_initializer kind found");
921 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
923 const ir_initializer_t *initializer = entity->attr.initializer;
925 normal_or_bitfield *vals;
929 if(initializer_is_string_const(initializer)) {
930 dump_string_initializer(initializer);
934 type = get_entity_type(entity);
935 size = get_initializer_size(initializer, type);
941 * In the worst case, every initializer allocates one byte.
942 * Moreover, initializer might be big, do not allocate on stack.
944 vals = xcalloc(size, sizeof(vals[0]));
951 dump_ir_initializer(vals, initializer, type);
953 /* now write values sorted */
954 for (k = 0; k < size; ) {
957 if (vals[k].kind == NORMAL) {
958 if(vals[k].v.value != NULL) {
959 dump_atomic_init(env, vals[k].v.value);
960 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
964 } else if(vals[k].kind == TARVAL) {
965 tarval *tv = vals[k].v.tarval;
966 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
971 dump_size_type(size);
972 dump_arith_tarval(tv, size);
974 be_emit_write_line();
976 assert(vals[k].kind == BITFIELD);
977 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
978 be_emit_write_line();
982 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
989 be_emit_irprintf("\t.skip\t%d\n", space);
990 be_emit_write_line();
997 * Dump an initializer for a compound entity.
999 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
1001 normal_or_bitfield *vals;
1003 unsigned k, last_ofs;
1005 if(ent->has_initializer) {
1006 dump_initializer(env, ent);
1010 n = get_compound_ent_n_values(ent);
1012 /* Find the initializer size. Sorrily gcc support a nasty feature:
1013 The last field of a compound may be a flexible array. This allows
1014 initializers bigger than the type size. */
1015 last_ofs = get_type_size_bytes(get_entity_type(ent));
1016 for (i = 0; i < n; ++i) {
1017 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1018 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1019 ir_node *value = get_compound_ent_value(ent, i);
1020 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1022 offset += (value_len + bits_remainder + 7) >> 3;
1024 if (offset > last_ofs) {
1030 * In the worst case, every initializer allocates one byte.
1031 * Moreover, initializer might be big, do not allocate on stack.
1033 vals = xcalloc(last_ofs, sizeof(vals[0]));
1035 /* collect the values and store them at the offsets */
1036 for (i = 0; i < n; ++i) {
1037 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1038 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1039 ir_node *value = get_compound_ent_value(ent, i);
1040 int value_len = get_mode_size_bits(get_irn_mode(value));
1042 assert(offset_bits >= 0);
1044 if (offset_bits != 0 ||
1045 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1046 tarval *tv = get_atomic_init_tv(value);
1047 unsigned char curr_bits, last_bits = 0;
1049 panic("Couldn't get numeric value for bitfield initializer '%s'\n",
1050 get_entity_ld_name(ent));
1052 /* normalize offset */
1053 offset += offset_bits >> 3;
1056 for (j = 0; value_len + offset_bits > 0; ++j) {
1057 assert(offset + j < last_ofs);
1058 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1059 vals[offset + j].kind = BITFIELD;
1060 curr_bits = get_tarval_sub_bits(tv, j);
1061 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1063 last_bits = curr_bits;
1068 assert(offset < last_ofs);
1069 assert(vals[offset].kind == NORMAL);
1070 for (i = 1; i < value_len / 8; ++i) {
1071 assert(vals[offset + i].v.value == NULL);
1073 vals[offset].v.value = value;
1077 /* now write them sorted */
1078 for (k = 0; k < last_ofs; ) {
1079 int space = 0, skip = 0;
1080 if (vals[k].kind == NORMAL) {
1081 if(vals[k].v.value != NULL) {
1082 dump_atomic_init(env, vals[k].v.value);
1083 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1088 assert(vals[k].kind == BITFIELD);
1089 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1093 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1102 be_emit_irprintf("\t.skip\t%d\n", space);
1103 be_emit_write_line();
1109 static void emit_align(unsigned alignment)
1111 if (!is_po2(alignment))
1112 panic("alignment not a power of 2");
1114 be_emit_irprintf(".p2align\t%u\n", log2_floor(alignment));
1115 be_emit_write_line();
1119 * Dump a global entity.
1121 * @param env the gas output environment
1122 * @param ent the entity to be dumped
1124 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1126 ir_type *type = get_entity_type(ent);
1127 ident *ld_ident = get_entity_ld_ident(ent);
1128 unsigned align = get_type_alignment_bytes(type);
1129 int emit_as_common = 0;
1130 be_gas_section_t section = env->section;
1131 ir_variability variability = get_entity_variability(ent);
1132 ir_visibility visibility = get_entity_visibility(ent);
1134 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1138 if (section != (be_gas_section_t) -1) {
1140 } else if (variability == variability_constant) {
1141 /* a constant entity, put it on the rdata */
1142 section = GAS_SECTION_RODATA;
1143 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1144 && ent_is_string_const(ent)) {
1145 section = GAS_SECTION_CSTRING;
1147 } else if (variability == variability_uninitialized) {
1148 /* uninitialized entity put it in bss segment */
1149 section = GAS_SECTION_COMMON;
1150 if (visibility != visibility_local)
1153 section = GAS_SECTION_DATA;
1156 if(!emit_as_common) {
1157 be_gas_emit_switch_section(section);
1160 be_dbg_variable(ent);
1162 /* global or not global */
1163 if (visibility == visibility_external_visible && !emit_as_common) {
1164 be_emit_cstring(".globl\t");
1165 be_emit_ident(ld_ident);
1167 be_emit_write_line();
1168 } else if(visibility == visibility_external_allocated) {
1169 be_emit_cstring(".globl\t");
1170 be_emit_ident(ld_ident);
1172 be_emit_write_line();
1173 /* we can return now... */
1177 if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1178 && section != GAS_SECTION_PIC_SYMBOLS) {
1182 if (!emit_as_common) {
1183 be_emit_ident(ld_ident);
1184 be_emit_cstring(":\n");
1185 be_emit_write_line();
1188 if (variability == variability_uninitialized) {
1189 if (emit_as_common) {
1190 switch (be_gas_flavour) {
1191 case GAS_FLAVOUR_ELF:
1192 case GAS_FLAVOUR_MACH_O:
1193 case GAS_FLAVOUR_YASM:
1194 be_emit_irprintf("\t.comm %s,%u,%u\n",
1195 get_id_str(ld_ident), get_type_size_bytes(type), align);
1196 be_emit_write_line();
1198 case GAS_FLAVOUR_MINGW:
1199 be_emit_irprintf("\t.comm %s,%u # %u\n",
1200 get_id_str(ld_ident), get_type_size_bytes(type), align);
1201 be_emit_write_line();
1204 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1205 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1206 be_emit_cstring("\t.indirect_symbol ");
1207 be_emit_ident(get_entity_ident(ent));
1209 be_emit_write_line();
1210 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1211 be_emit_write_line();
1213 panic("PIC trampolines not yet supported in this gas mode");
1216 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1217 be_emit_write_line();
1220 if (is_atomic_entity(ent)) {
1221 dump_atomic_init(env, get_atomic_ent_value(ent));
1223 /* sort_compound_ent_values(ent); */
1225 switch (get_type_tpop_code(get_entity_type(ent))) {
1227 if (ent_is_string_const(ent))
1228 dump_string_cst(ent);
1230 dump_compound_init(env, ent);
1235 dump_compound_init(env, ent);
1245 * Dumps declarations of global variables and the initialization code.
1247 * @param gt a global like type, either the global or the TLS one
1248 * @param env an environment
1249 * @param only_emit_marked if non-zero, external allocated entities that do not have
1250 * its visited flag set are ignored
1252 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1253 int only_emit_marked)
1255 int i, n = get_compound_n_members(gt);
1256 waitq *worklist = new_waitq();
1258 if (only_emit_marked) {
1259 for (i = 0; i < n; i++) {
1260 ir_entity *ent = get_compound_member(gt, i);
1261 if (is_entity_backend_marked(ent) ||
1262 get_entity_visibility(ent) != visibility_external_allocated) {
1263 waitq_put(worklist, ent);
1264 set_entity_backend_marked(ent, 1);
1268 for (i = 0; i < n; i++) {
1269 ir_entity *ent = get_compound_member(gt, i);
1270 set_entity_backend_marked(ent, 1);
1271 waitq_put(worklist, ent);
1275 env->worklist = worklist;
1277 while (!waitq_empty(worklist)) {
1278 ir_entity *ent = waitq_get(worklist);
1280 dump_global(env, ent);
1283 del_waitq(worklist);
1284 env->worklist = NULL;
1287 /************************************************************************/
1289 /* Generate all entities. */
1290 void be_gas_emit_decls(const be_main_env_t *main_env,
1291 int only_emit_marked_entities)
1293 be_gas_decl_env_t env;
1294 memset(&env, 0, sizeof(env));
1296 env.main_env = main_env;
1298 /* dump global type */
1299 env.section = (be_gas_section_t) -1;
1300 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1301 env.section = GAS_SECTION_TLS;
1302 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1303 env.section = GAS_SECTION_CONSTRUCTORS;
1304 be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1305 only_emit_marked_entities);
1306 env.section = GAS_SECTION_DESTRUCTORS;
1307 be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1308 only_emit_marked_entities);
1310 env.section = GAS_SECTION_PIC_SYMBOLS;
1311 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1312 only_emit_marked_entities);
1314 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1315 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1316 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1317 only_emit_marked_entities);
1318 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1319 be_emit_cstring("\t.subsections_via_symbols\n");
1320 be_emit_write_line();