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 /* Beware: Mixed endian output! One little endian number emitted as
253 * three longs. Each long initializer is written in big endian. */
255 "\t.long\t0x%02x%02x%02x%02x\n"
256 "\t.long\t0x%02x%02x%02x%02x\n"
257 "\t.long\t0x%02x%02x%02x%02x",
258 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
259 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0),
260 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
261 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
262 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
263 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8)
269 "\t.long\t0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x0x%02x%02x%02x%02x",
270 get_tarval_sub_bits(tv, 15), get_tarval_sub_bits(tv, 16),
271 get_tarval_sub_bits(tv, 13), get_tarval_sub_bits(tv, 12),
272 get_tarval_sub_bits(tv, 11), get_tarval_sub_bits(tv, 10),
273 get_tarval_sub_bits(tv, 9), get_tarval_sub_bits(tv, 8),
274 get_tarval_sub_bits(tv, 7), get_tarval_sub_bits(tv, 6),
275 get_tarval_sub_bits(tv, 5), get_tarval_sub_bits(tv, 4),
276 get_tarval_sub_bits(tv, 3), get_tarval_sub_bits(tv, 2),
277 get_tarval_sub_bits(tv, 1), get_tarval_sub_bits(tv, 0)
282 panic("Can't dump a tarval with %d bytes", bytes);
286 * Return the label prefix for labeled blocks.
288 const char *be_gas_block_label_prefix(void) {
293 * Return the label prefix for labeled instructions.
295 const char *be_gas_insn_label_prefix(void) {
302 static void dump_label(ir_label_t label) {
303 be_emit_irprintf("%s%lu", be_gas_block_label_prefix(), label);
307 * Return the tarval of an atomic initializer.
309 * @param init a node representing the initializer (on the const code irg)
313 static tarval *get_atomic_init_tv(ir_node *init)
316 ir_mode *mode = get_irn_mode(init);
318 switch (get_irn_opcode(init)) {
321 init = get_Cast_op(init);
325 init = get_Conv_op(init);
329 return get_Const_tarval(init);
332 switch (get_SymConst_kind(init)) {
333 case symconst_type_size:
334 return new_tarval_from_long(get_type_size_bytes(get_SymConst_type(init)), mode);
336 case symconst_type_align:
337 return new_tarval_from_long(get_type_alignment_bytes(get_SymConst_type(init)), mode);
339 case symconst_ofs_ent:
340 return new_tarval_from_long(get_entity_offset(get_SymConst_entity(init)), mode);
342 case symconst_enum_const:
343 return get_enumeration_value(get_SymConst_enum(init));
359 * Dump an atomic value.
361 * @param env the gas output environment
362 * @param init a node representing the atomic value (on the const code irg)
364 static void do_dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
366 ir_mode *mode = get_irn_mode(init);
367 int bytes = get_mode_size_bytes(mode);
372 init = skip_Id(init);
374 switch (get_irn_opcode(init)) {
376 do_dump_atomic_init(env, get_Cast_op(init));
380 do_dump_atomic_init(env, get_Conv_op(init));
384 tv = get_Const_tarval(init);
386 /* it's a arithmetic value */
387 dump_arith_tarval(tv, bytes);
391 switch (get_SymConst_kind(init)) {
392 case symconst_addr_name:
393 be_emit_ident(get_SymConst_name(init));
396 case symconst_addr_ent:
397 ent = get_SymConst_entity(init);
398 if(!is_entity_backend_marked(ent)) {
399 waitq_put(env->worklist, ent);
400 set_entity_backend_marked(ent, 1);
402 be_emit_ident(get_entity_ld_ident(ent));
405 case symconst_ofs_ent:
406 ent = get_SymConst_entity(init);
407 #if 0 /* not needed, is it? */
408 if(!is_entity_backend_marked(ent)) {
409 waitq_put(env->worklist, ent);
410 set_entity_backend_marked(ent, 1);
413 be_emit_irprintf("%d", get_entity_offset(ent));
416 case symconst_type_size:
417 be_emit_irprintf("%u", get_type_size_bytes(get_SymConst_type(init)));
420 case symconst_type_align:
421 be_emit_irprintf("%u", get_type_alignment_bytes(get_SymConst_type(init)));
424 case symconst_enum_const:
425 tv = get_enumeration_value(get_SymConst_enum(init));
426 dump_arith_tarval(tv, bytes);
430 label = get_SymConst_label(init);
435 assert(!"dump_atomic_init(): don't know how to init from this SymConst");
440 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
441 panic("Constant must be int or pointer for '+' to work");
443 do_dump_atomic_init(env, get_Add_left(init));
444 be_emit_cstring(" + ");
445 do_dump_atomic_init(env, get_Add_right(init));
449 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
450 panic("Constant must be int or pointer for '-' to work");
452 do_dump_atomic_init(env, get_Sub_left(init));
453 be_emit_cstring(" - ");
454 do_dump_atomic_init(env, get_Sub_right(init));
458 if (!mode_is_int(mode) && !mode_is_reference(mode)) {
459 panic("Constant must be int or pointer for '*' to work");
461 do_dump_atomic_init(env, get_Mul_left(init));
462 be_emit_cstring(" * ");
463 do_dump_atomic_init(env, get_Mul_right(init));
467 assert(0 && "dump_atomic_init(): unknown IR-node");
472 * Dumps the type for given size (.byte, .long, ...)
474 * @param size the size in bytes
476 static void dump_size_type(size_t size) {
479 be_emit_cstring("\t.byte\t");
483 be_emit_cstring("\t.word\t");
487 be_emit_cstring("\t.long\t");
491 be_emit_cstring("\t.quad\t");
496 /* handled in arith */
500 be_emit_cstring("\t.octa\t");
504 panic("Try to dump a type with %u bytes", (unsigned)size);
509 * Emit an atomic value.
511 * @param env the gas output environment
512 * @param init a node representing the atomic value (on the const code irg)
514 static void dump_atomic_init(be_gas_decl_env_t *env, ir_node *init)
516 ir_mode *mode = get_irn_mode(init);
517 int bytes = get_mode_size_bytes(mode);
519 dump_size_type(bytes);
520 do_dump_atomic_init(env, init);
522 be_emit_write_line();
525 /************************************************************************/
526 /* Routines to dump global variables */
527 /************************************************************************/
529 static int initializer_is_string_const(const ir_initializer_t *initializer)
532 int found_printable = 0;
534 if(initializer->kind != IR_INITIALIZER_COMPOUND)
537 len = initializer->compound.n_initializers;
540 for(i = 0; i < len; ++i) {
544 ir_initializer_t *sub_initializer
545 = initializer->compound.initializers[i];
547 if(sub_initializer->kind != IR_INITIALIZER_TARVAL)
550 tv = sub_initializer->tarval.value;
551 mode = get_tarval_mode(tv);
553 if (!mode_is_int(mode)
554 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
557 c = get_tarval_long(tv);
558 if (isgraph(c) || isspace(c))
563 if (i == len - 1 && c != '\0')
567 return found_printable;
571 * Determine if an entity is a string constant
572 * @param ent The entity
573 * @return 1 if it is a string constant, 0 otherwise
575 static int ent_is_string_const(ir_entity *ent)
577 ir_type *type, *element_type;
580 int found_printable = 0;
582 type = get_entity_type(ent);
584 /* if it's an array */
585 if (!is_Array_type(type))
588 element_type = get_array_element_type(type);
590 /* and the array's element type is primitive */
591 if (!is_Primitive_type(element_type))
594 /* and the mode of the element type is an int of
595 * the same size as the byte mode */
596 mode = get_type_mode(element_type);
597 if (!mode_is_int(mode)
598 || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
601 if(ent->has_initializer) {
605 /* if it contains only printable chars and a 0 at the end */
606 n = get_compound_ent_n_values(ent);
607 for (i = 0; i < n; ++i) {
608 ir_node *irn = get_compound_ent_value(ent, i);
612 c = (int) get_tarval_long(get_Const_tarval(irn));
614 if (isgraph(c) || isspace(c))
619 if (i == n - 1 && c != '\0')
624 /* then we can emit it as a string constant */
625 return found_printable;
629 * Dump a string constant.
630 * No checks are made!!
632 * @param ent The entity to dump.
634 static void dump_string_cst(ir_entity *ent)
641 len = get_compound_ent_n_values(ent);
642 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
643 be_emit_cstring("\t.ascii \"");
645 be_emit_cstring("\t.string \"");
649 for (i = 0; i < len; ++i) {
653 irn = get_compound_ent_value(ent, i);
654 c = (int) get_tarval_long(get_Const_tarval(irn));
657 case '"' : be_emit_cstring("\\\""); break;
658 case '\n': be_emit_cstring("\\n"); break;
659 case '\r': be_emit_cstring("\\r"); break;
660 case '\t': be_emit_cstring("\\t"); break;
661 case '\\': be_emit_cstring("\\\\"); break;
666 be_emit_irprintf("\\%o", c);
670 be_emit_cstring("\"\n");
671 be_emit_write_line();
673 type = get_entity_type(ent);
674 type_size = get_type_size_bytes(type);
675 remaining_space = type_size - len;
676 assert(remaining_space >= 0);
677 if(remaining_space > 0) {
678 be_emit_irprintf("\t.skip\t%d\n", remaining_space);
682 static void dump_string_initializer(const ir_initializer_t *initializer)
686 len = initializer->compound.n_initializers;
687 if(be_gas_flavour == GAS_FLAVOUR_MACH_O) {
688 be_emit_cstring("\t.ascii \"");
690 be_emit_cstring("\t.string \"");
694 for(i = 0; i < len; ++i) {
695 const ir_initializer_t *sub_initializer
696 = get_initializer_compound_value(initializer, i);
698 tarval *tv = get_initializer_tarval_value(sub_initializer);
699 int c = get_tarval_long(tv);
702 case '"' : be_emit_cstring("\\\""); break;
703 case '\n': be_emit_cstring("\\n"); break;
704 case '\r': be_emit_cstring("\\r"); break;
705 case '\t': be_emit_cstring("\\t"); break;
706 case '\\': be_emit_cstring("\\\\"); break;
711 be_emit_irprintf("\\%o", c);
715 be_emit_cstring("\"\n");
716 be_emit_write_line();
719 enum normal_or_bitfield_kind {
726 enum normal_or_bitfield_kind kind;
730 unsigned char bf_val;
732 } normal_or_bitfield;
734 static int is_type_variable_size(ir_type *type)
741 static size_t get_initializer_size(const ir_initializer_t *initializer,
744 switch(get_initializer_kind(initializer)) {
745 case IR_INITIALIZER_TARVAL: {
746 assert(get_tarval_mode(get_initializer_tarval_value(initializer)) == get_type_mode(type));
747 return get_type_size_bytes(type);
749 case IR_INITIALIZER_CONST:
750 case IR_INITIALIZER_NULL:
751 return get_type_size_bytes(type);
752 case IR_INITIALIZER_COMPOUND: {
753 if(!is_type_variable_size(type)) {
754 return get_type_size_bytes(type);
757 = get_initializer_compound_n_entries(initializer);
759 unsigned initializer_size = get_type_size_bytes(type);
760 for(i = 0; i < n_entries; ++i) {
761 ir_entity *entity = get_compound_member(type, i);
762 ir_type *type = get_entity_type(entity);
764 const ir_initializer_t *sub_initializer
765 = get_initializer_compound_value(initializer, i);
767 unsigned offset = get_entity_offset(entity);
768 unsigned size = get_initializer_size(sub_initializer, type);
770 if(offset + size > initializer_size) {
771 initializer_size = offset + size;
774 return initializer_size;
779 panic("found invalid initializer");
783 static normal_or_bitfield *glob_vals;
784 static size_t max_vals;
787 static void dump_bitfield(normal_or_bitfield *vals, size_t offset_bits,
788 const ir_initializer_t *initializer, ir_type *type)
790 unsigned char last_bits = 0;
791 ir_mode *mode = get_type_mode(type);
793 unsigned char curr_bits;
797 switch(get_initializer_kind(initializer)) {
798 case IR_INITIALIZER_NULL:
800 case IR_INITIALIZER_TARVAL:
801 tv = get_initializer_tarval_value(initializer);
803 case IR_INITIALIZER_CONST: {
804 ir_node *node = get_initializer_const_value(initializer);
805 if(!is_Const(node)) {
806 panic("bitfield initializer not a Const node");
808 tv = get_Const_tarval(node);
811 case IR_INITIALIZER_COMPOUND:
812 panic("bitfield initializer is compound");
815 panic("Couldn't get numeric value for bitfield initializer");
818 /* normalize offset */
819 vals += offset_bits >> 3;
821 value_len = get_mode_size_bits(mode);
823 /* combine bits with existing bits */
824 for (j = 0; value_len + (int) offset_bits > 0; ++j) {
825 assert((size_t) (vals - glob_vals) + j < max_vals);
826 assert(vals[j].kind == BITFIELD ||
827 (vals[j].kind == NORMAL && vals[j].v.value == NULL));
828 vals[j].kind = BITFIELD;
829 curr_bits = get_tarval_sub_bits(tv, j);
831 |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
833 last_bits = curr_bits;
837 static void dump_ir_initializer(normal_or_bitfield *vals,
838 const ir_initializer_t *initializer,
841 assert((size_t) (vals - glob_vals) < max_vals);
843 switch(get_initializer_kind(initializer)) {
844 case IR_INITIALIZER_NULL:
846 case IR_INITIALIZER_TARVAL: {
849 assert(vals->kind != BITFIELD);
851 vals->v.tarval = get_initializer_tarval_value(initializer);
852 assert(get_type_mode(type) == get_tarval_mode(vals->v.tarval));
853 for(i = 1; i < get_type_size_bytes(type); ++i) {
854 vals[i].kind = NORMAL;
855 vals[i].v.value = NULL;
859 case IR_INITIALIZER_CONST: {
862 assert(vals->kind != BITFIELD);
864 vals->v.value = get_initializer_const_value(initializer);
865 for(i = 1; i < get_type_size_bytes(type); ++i) {
866 vals[i].kind = NORMAL;
867 vals[i].v.value = NULL;
871 case IR_INITIALIZER_COMPOUND: {
873 size_t n = get_initializer_compound_n_entries(initializer);
875 if(is_Array_type(type)) {
876 ir_type *element_type = get_array_element_type(type);
877 size_t skip = get_type_size_bytes(element_type);
878 size_t alignment = get_type_alignment_bytes(element_type);
879 size_t misalign = skip % alignment;
881 skip += alignment - misalign;
884 for(i = 0; i < n; ++i) {
885 ir_initializer_t *sub_initializer
886 = get_initializer_compound_value(initializer, i);
888 dump_ir_initializer(vals, sub_initializer, element_type);
894 assert(is_compound_type(type));
895 n_members = get_compound_n_members(type);
896 for(i = 0; i < n_members; ++i) {
897 ir_entity *member = get_compound_member(type, i);
898 size_t offset = get_entity_offset(member);
899 ir_type *subtype = get_entity_type(member);
900 ir_mode *mode = get_type_mode(subtype);
901 ir_initializer_t *sub_initializer;
903 assert(i < get_initializer_compound_n_entries(initializer));
905 = get_initializer_compound_value(initializer, i);
909 = get_entity_offset_bits_remainder(member);
910 size_t value_len = get_mode_size_bits(mode);
912 if(offset_bits != 0 ||
913 (value_len != 8 && value_len != 16 && value_len != 32
914 && value_len != 64)) {
915 dump_bitfield(&vals[offset], offset_bits,
916 sub_initializer, subtype);
921 dump_ir_initializer(&vals[offset], sub_initializer, subtype);
928 panic("invalid ir_initializer kind found");
931 static void dump_initializer(be_gas_decl_env_t *env, ir_entity *entity)
933 const ir_initializer_t *initializer = entity->attr.initializer;
935 normal_or_bitfield *vals;
939 if(initializer_is_string_const(initializer)) {
940 dump_string_initializer(initializer);
944 type = get_entity_type(entity);
945 size = get_initializer_size(initializer, type);
951 * In the worst case, every initializer allocates one byte.
952 * Moreover, initializer might be big, do not allocate on stack.
954 vals = xcalloc(size, sizeof(vals[0]));
961 dump_ir_initializer(vals, initializer, type);
963 /* now write values sorted */
964 for (k = 0; k < size; ) {
967 if (vals[k].kind == NORMAL) {
968 if(vals[k].v.value != NULL) {
969 dump_atomic_init(env, vals[k].v.value);
970 elem_size = get_mode_size_bytes(get_irn_mode(vals[k].v.value));
974 } else if(vals[k].kind == TARVAL) {
975 tarval *tv = vals[k].v.tarval;
976 size_t size = get_mode_size_bytes(get_tarval_mode(tv));
981 dump_size_type(size);
982 dump_arith_tarval(tv, size);
984 be_emit_write_line();
986 assert(vals[k].kind == BITFIELD);
987 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
988 be_emit_write_line();
992 while (k < size && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
999 be_emit_irprintf("\t.skip\t%d\n", space);
1000 be_emit_write_line();
1007 * Dump an initializer for a compound entity.
1009 static void dump_compound_init(be_gas_decl_env_t *env, ir_entity *ent)
1011 normal_or_bitfield *vals;
1013 unsigned k, last_ofs;
1015 if(ent->has_initializer) {
1016 dump_initializer(env, ent);
1020 n = get_compound_ent_n_values(ent);
1022 /* Find the initializer size. Sorrily gcc support a nasty feature:
1023 The last field of a compound may be a flexible array. This allows
1024 initializers bigger than the type size. */
1025 last_ofs = get_type_size_bytes(get_entity_type(ent));
1026 for (i = 0; i < n; ++i) {
1027 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1028 unsigned bits_remainder = get_compound_ent_value_offset_bit_remainder(ent, i);
1029 ir_node *value = get_compound_ent_value(ent, i);
1030 unsigned value_len = get_mode_size_bits(get_irn_mode(value));
1032 offset += (value_len + bits_remainder + 7) >> 3;
1034 if (offset > last_ofs) {
1040 * In the worst case, every initializer allocates one byte.
1041 * Moreover, initializer might be big, do not allocate on stack.
1043 vals = xcalloc(last_ofs, sizeof(vals[0]));
1045 /* collect the values and store them at the offsets */
1046 for (i = 0; i < n; ++i) {
1047 unsigned offset = get_compound_ent_value_offset_bytes(ent, i);
1048 int offset_bits = get_compound_ent_value_offset_bit_remainder(ent, i);
1049 ir_node *value = get_compound_ent_value(ent, i);
1050 int value_len = get_mode_size_bits(get_irn_mode(value));
1052 assert(offset_bits >= 0);
1054 if (offset_bits != 0 ||
1055 (value_len != 8 && value_len != 16 && value_len != 32 && value_len != 64)) {
1056 tarval *tv = get_atomic_init_tv(value);
1057 unsigned char curr_bits, last_bits = 0;
1059 panic("Couldn't get numeric value for bitfield initializer '%s'",
1060 get_entity_ld_name(ent));
1062 /* normalize offset */
1063 offset += offset_bits >> 3;
1066 for (j = 0; value_len + offset_bits > 0; ++j) {
1067 assert(offset + j < last_ofs);
1068 assert(vals[offset + j].kind == BITFIELD || vals[offset + j].v.value == NULL);
1069 vals[offset + j].kind = BITFIELD;
1070 curr_bits = get_tarval_sub_bits(tv, j);
1071 vals[offset + j].v.bf_val |= (last_bits >> (8 - offset_bits)) | (curr_bits << offset_bits);
1073 last_bits = curr_bits;
1078 assert(offset < last_ofs);
1079 assert(vals[offset].kind == NORMAL);
1080 for (i = 1; i < value_len / 8; ++i) {
1081 assert(vals[offset + i].v.value == NULL);
1083 vals[offset].v.value = value;
1087 /* now write them sorted */
1088 for (k = 0; k < last_ofs; ) {
1089 int space = 0, skip = 0;
1090 if (vals[k].kind == NORMAL) {
1091 if(vals[k].v.value != NULL) {
1092 dump_atomic_init(env, vals[k].v.value);
1093 skip = get_mode_size_bytes(get_irn_mode(vals[k].v.value)) - 1;
1098 assert(vals[k].kind == BITFIELD);
1099 be_emit_irprintf("\t.byte\t%d\n", vals[k].v.bf_val);
1103 while (k < last_ofs && vals[k].kind == NORMAL && vals[k].v.value == NULL) {
1112 be_emit_irprintf("\t.skip\t%d\n", space);
1113 be_emit_write_line();
1119 static void emit_align(unsigned alignment)
1121 if (!is_po2(alignment))
1122 panic("alignment not a power of 2");
1124 be_emit_irprintf("\t.p2align\t%u\n", log2_floor(alignment));
1125 be_emit_write_line();
1129 * Dump a global entity.
1131 * @param env the gas output environment
1132 * @param ent the entity to be dumped
1134 static void dump_global(be_gas_decl_env_t *env, ir_entity *ent)
1136 ir_type *type = get_entity_type(ent);
1137 ident *ld_ident = get_entity_ld_ident(ent);
1138 unsigned align = get_type_alignment_bytes(type);
1139 int emit_as_common = 0;
1140 be_gas_section_t section = env->section;
1141 ir_variability variability = get_entity_variability(ent);
1142 ir_visibility visibility = get_entity_visibility(ent);
1144 if (is_Method_type(type) && section != GAS_SECTION_PIC_TRAMPOLINES) {
1148 if (section != (be_gas_section_t) -1) {
1150 } else if (variability == variability_constant) {
1151 /* a constant entity, put it on the rdata */
1152 section = GAS_SECTION_RODATA;
1153 if (be_gas_flavour == GAS_FLAVOUR_MACH_O
1154 && ent_is_string_const(ent)) {
1155 section = GAS_SECTION_CSTRING;
1157 } else if (variability == variability_uninitialized) {
1158 /* uninitialized entity put it in bss segment */
1159 section = GAS_SECTION_COMMON;
1160 if (visibility != visibility_local)
1163 section = GAS_SECTION_DATA;
1166 if(!emit_as_common) {
1167 be_gas_emit_switch_section(section);
1170 be_dbg_variable(ent);
1172 /* global or not global */
1173 if (visibility == visibility_external_visible && !emit_as_common) {
1174 be_emit_cstring(".globl\t");
1175 be_emit_ident(ld_ident);
1177 be_emit_write_line();
1178 } else if(visibility == visibility_external_allocated) {
1179 be_emit_cstring(".globl\t");
1180 be_emit_ident(ld_ident);
1182 be_emit_write_line();
1183 /* we can return now... */
1187 if (align > 1 && !emit_as_common && section != GAS_SECTION_PIC_TRAMPOLINES
1188 && section != GAS_SECTION_PIC_SYMBOLS) {
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_ELF:
1211 case GAS_FLAVOUR_MACH_O:
1212 case GAS_FLAVOUR_YASM:
1213 be_emit_irprintf("\t.comm %s,%u,%u\n",
1214 get_id_str(ld_ident), get_type_size_bytes(type), align);
1215 be_emit_write_line();
1217 case GAS_FLAVOUR_MINGW:
1218 be_emit_irprintf("\t.comm %s,%u # %u\n",
1219 get_id_str(ld_ident), get_type_size_bytes(type), align);
1220 be_emit_write_line();
1223 } else if (section == GAS_SECTION_PIC_TRAMPOLINES) {
1224 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1225 be_emit_cstring("\t.indirect_symbol ");
1226 be_emit_ident(get_entity_ident(ent));
1228 be_emit_write_line();
1229 be_emit_cstring("\thlt ; hlt ; hlt ; hlt ; hlt\n");
1230 be_emit_write_line();
1232 panic("PIC trampolines not yet supported in this gas mode");
1235 be_emit_irprintf("\t.space %u\n", get_type_size_bytes(type));
1236 be_emit_write_line();
1239 if (is_atomic_entity(ent)) {
1240 dump_atomic_init(env, get_atomic_ent_value(ent));
1242 /* sort_compound_ent_values(ent); */
1244 switch (get_type_tpop_code(get_entity_type(ent))) {
1246 if (ent_is_string_const(ent))
1247 dump_string_cst(ent);
1249 dump_compound_init(env, ent);
1254 dump_compound_init(env, ent);
1264 * Dumps declarations of global variables and the initialization code.
1266 * @param gt a global like type, either the global or the TLS one
1267 * @param env an environment
1268 * @param only_emit_marked if non-zero, external allocated entities that do not have
1269 * its visited flag set are ignored
1271 static void be_gas_dump_globals(ir_type *gt, be_gas_decl_env_t *env,
1272 int only_emit_marked)
1274 int i, n = get_compound_n_members(gt);
1275 waitq *worklist = new_waitq();
1277 if (only_emit_marked) {
1278 for (i = 0; i < n; i++) {
1279 ir_entity *ent = get_compound_member(gt, i);
1280 if (is_entity_backend_marked(ent) ||
1281 get_entity_visibility(ent) != visibility_external_allocated) {
1282 waitq_put(worklist, ent);
1283 set_entity_backend_marked(ent, 1);
1287 for (i = 0; i < n; i++) {
1288 ir_entity *ent = get_compound_member(gt, i);
1289 set_entity_backend_marked(ent, 1);
1290 waitq_put(worklist, ent);
1294 env->worklist = worklist;
1296 while (!waitq_empty(worklist)) {
1297 ir_entity *ent = waitq_get(worklist);
1299 dump_global(env, ent);
1302 del_waitq(worklist);
1303 env->worklist = NULL;
1306 /************************************************************************/
1308 /* Generate all entities. */
1309 void be_gas_emit_decls(const be_main_env_t *main_env,
1310 int only_emit_marked_entities)
1312 be_gas_decl_env_t env;
1313 memset(&env, 0, sizeof(env));
1315 env.main_env = main_env;
1317 /* dump global type */
1318 env.section = (be_gas_section_t) -1;
1319 be_gas_dump_globals(get_glob_type(), &env, only_emit_marked_entities);
1320 env.section = GAS_SECTION_TLS;
1321 be_gas_dump_globals(get_tls_type(), &env, only_emit_marked_entities);
1322 env.section = GAS_SECTION_CONSTRUCTORS;
1323 be_gas_dump_globals(get_segment_type(IR_SEGMENT_CONSTRUCTORS), &env,
1324 only_emit_marked_entities);
1325 env.section = GAS_SECTION_DESTRUCTORS;
1326 be_gas_dump_globals(get_segment_type(IR_SEGMENT_DESTRUCTORS), &env,
1327 only_emit_marked_entities);
1329 env.section = GAS_SECTION_PIC_SYMBOLS;
1330 be_gas_dump_globals(main_env->pic_symbols_type, &env,
1331 only_emit_marked_entities);
1333 if (get_compound_n_members(main_env->pic_trampolines_type) > 0) {
1334 env.section = GAS_SECTION_PIC_TRAMPOLINES;
1335 be_gas_dump_globals(main_env->pic_trampolines_type, &env,
1336 only_emit_marked_entities);
1337 if (be_gas_flavour == GAS_FLAVOUR_MACH_O) {
1338 be_emit_cstring("\t.subsections_via_symbols\n");
1339 be_emit_write_line();