2 * emit-x86.c: Support functions for emitting x86 code
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Miguel de Icaza (miguel@ximian.com)
8 * (C) 2001 Ximian, Inc.
14 #include <mono/metadata/assembly.h>
15 #include <mono/metadata/loader.h>
16 #include <mono/metadata/cil-coff.h>
17 #include <mono/metadata/tabledefs.h>
18 #include <mono/metadata/class.h>
19 #include <mono/metadata/debug-helpers.h>
20 #include <mono/metadata/mono-endian.h>
21 #include <mono/arch/x86/x86-codegen.h>
22 #include <mono/metadata/profiler-private.h>
29 //#define DEBUG_REGALLOC
30 //#define DEBUG_SPILLS
33 * we may want a x86-specific header or we
34 * can just declare it extern in x86.brg.
36 int mono_x86_have_cmov = 0;
39 cpuid (int id, int* p_eax, int* p_ebx, int* p_ecx, int* p_edx)
42 __asm__ __volatile__ (
46 "xorl $0x200000, %%eax\n"
52 "andl $0x200000, %%eax\n"
60 __asm__ __volatile__ ("cpuid"
61 : "=a" (*p_eax), "=b" (*p_ebx), "=c" (*p_ecx), "=d" (*p_edx)
69 mono_cpu_detect (void) {
70 int eax, ebx, ecx, edx;
72 /* Feature Flags function, flags returned in EDX. */
73 if (cpuid(1, &eax, &ebx, &ecx, &edx)) {
74 if (edx & (1U << 15)) {
75 mono_x86_have_cmov = 1;
81 enter_method (MonoMethod *method, char *ebp)
88 tmpsig = mono_signature_get_desc(method->signature, TRUE);
89 printf ("ENTER: %s.%s::%s (%s)\n(", method->klass->name_space,
90 method->klass->name, method->name, tmpsig);
93 if (((int)ebp & 3) != 0) {
94 g_error ("unaligned stack detected (%p)", ebp);
99 if (ISSTRUCT (method->signature->ret)) {
102 g_assert (!method->signature->ret->byref);
104 size = mono_type_stack_size (method->signature->ret, &align);
106 printf ("VALUERET:%p, ", *((gpointer *)ebp));
107 ebp += sizeof (gpointer);
110 if (method->signature->hasthis) {
111 if (method->klass->valuetype) {
112 printf ("value:%p, ", *((gpointer *)ebp));
114 o = *((MonoObject **)ebp);
118 class = o->vtable->klass;
120 if (class == mono_defaults.string_class) {
121 printf ("this:[STRING:%p:%s], ", o, mono_string_to_utf8 ((MonoString *)o));
123 printf ("this:%p[%s.%s], ", o, class->name_space, class->name);
126 ebp += sizeof (gpointer);
129 for (i = 0; i < method->signature->param_count; ++i) {
130 MonoType *type = method->signature->params [i];
132 size = mono_type_stack_size (type, &align);
135 printf ("[BYREF:%p], ", *((gpointer *)ebp));
136 } else switch (type->type) {
138 case MONO_TYPE_BOOLEAN:
148 printf ("%d, ", *((int *)(ebp)));
150 case MONO_TYPE_STRING: {
151 MonoString *s = *((MonoString **)ebp);
153 g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
154 printf ("[STRING:%p:%s], ", s, mono_string_to_utf8 (s));
156 printf ("[STRING:null], ");
159 case MONO_TYPE_CLASS:
160 case MONO_TYPE_OBJECT: {
161 o = *((MonoObject **)ebp);
163 class = o->vtable->klass;
165 if (class == mono_defaults.string_class) {
166 printf ("[STRING:%p:%s], ", o, mono_string_to_utf8 ((MonoString *)o));
167 } else if (class == mono_defaults.int32_class) {
168 printf ("[INT32:%p:%d], ", o, *(gint32 *)((char *)o + sizeof (MonoObject)));
170 printf ("[%s.%s:%p], ", class->name_space, class->name, o);
172 printf ("%p, ", *((gpointer *)(ebp)));
177 case MONO_TYPE_FNPTR:
178 case MONO_TYPE_ARRAY:
179 case MONO_TYPE_SZARRAY:
180 printf ("%p, ", *((gpointer *)(ebp)));
183 printf ("%lld, ", *((gint64 *)(ebp)));
186 printf ("%f, ", *((float *)(ebp)));
189 printf ("%f, ", *((double *)(ebp)));
191 case MONO_TYPE_VALUETYPE:
193 for (j = 0; j < size; j++)
194 printf ("%02x,", *((guint8*)ebp +j));
201 g_assert (align == 4 || align == 8);
202 ebp += size + align - 1;
203 ebp = (gpointer)((unsigned)ebp & ~(align - 1));
210 leave_method (MonoMethod *method, int edx, int eax, double test)
214 printf ("LEAVE: %s.%s::%s ", method->klass->name_space,
215 method->klass->name, method->name);
217 switch (method->signature->ret->type) {
220 case MONO_TYPE_BOOLEAN:
222 printf ("TRUE:%d", eax);
236 printf ("EAX=%d", eax);
238 case MONO_TYPE_STRING: {
239 MonoString *s = (MonoString *)eax;
242 g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
243 printf ("[STRING:%p:%s]", s, mono_string_to_utf8 (s));
245 printf ("[STRING:null], ");
248 case MONO_TYPE_OBJECT: {
249 MonoObject *o = (MonoObject *)eax;
252 if (o->vtable->klass == mono_defaults.boolean_class) {
253 printf ("[BOOLEAN:%p:%d]", o, *((guint8 *)o + sizeof (MonoObject)));
254 } else if (o->vtable->klass == mono_defaults.int32_class) {
255 printf ("[INT32:%p:%d]", o, *((gint32 *)((char *)o + sizeof (MonoObject))));
257 printf ("[%s.%s:%p]", o->vtable->klass->name_space, o->vtable->klass->name, o);
259 printf ("[OBJECT:%p]", o);
263 case MONO_TYPE_CLASS:
265 case MONO_TYPE_FNPTR:
266 case MONO_TYPE_ARRAY:
267 case MONO_TYPE_SZARRAY:
268 printf ("EAX=%p", (gpointer)eax);
271 *((gint32 *)&l) = eax;
272 *((gint32 *)&l + 1) = edx;
273 printf ("EAX/EDX=%lld", l);
276 printf ("FP=%f\n", test);
279 printf ("(unknown return type)");
286 * arch_emit_prologue:
287 * @cfg: pointer to status information
289 * Emits the function prolog.
292 arch_emit_prologue (MonoFlowGraph *cfg)
294 MonoMethod *method = cfg->method;
295 MonoMethodHeader *header = ((MonoMethodNormal *)method)->header;
296 int i, j, k, alloc_size;
298 x86_push_reg (cfg->code, X86_EBP);
299 x86_mov_reg_reg (cfg->code, X86_EBP, X86_ESP, 4);
301 alloc_size = cfg->locals_size;
303 if (mono_regset_reg_used (cfg->rs, X86_EBX)) {
304 x86_push_reg (cfg->code, X86_EBX);
308 if (mono_regset_reg_used (cfg->rs, X86_EDI)) {
309 x86_push_reg (cfg->code, X86_EDI);
313 if (mono_regset_reg_used (cfg->rs, X86_ESI)) {
314 x86_push_reg (cfg->code, X86_ESI);
319 x86_alu_reg_imm (cfg->code, X86_SUB, X86_ESP, alloc_size);
321 if (mono_jit_trace_calls) {
322 x86_push_reg (cfg->code, X86_EBP);
323 x86_push_imm (cfg->code, cfg->method);
324 x86_mov_reg_imm (cfg->code, X86_EAX, enter_method);
325 x86_call_reg (cfg->code, X86_EAX);
326 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 8);
328 if (mono_jit_profile) {
329 x86_push_imm (cfg->code, cfg->method);
330 x86_mov_reg_imm (cfg->code, X86_EAX, mono_profiler_method_enter);
331 x86_call_reg (cfg->code, X86_EAX);
332 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 4);
335 /* initialize local vars */
336 if (header->num_locals) {
337 gboolean unassigned_locals = TRUE;
339 if (cfg->bblocks [0].live_in_set) {
340 i = mono_bitset_find_first (cfg->bblocks [0].live_in_set,
341 cfg->locals_start_index - 1);
342 unassigned_locals = (i >= 0 && i < cfg->locals_start_index +
346 if (unassigned_locals && header->init_locals) {
347 MonoVarInfo *vi = &VARINFO (cfg, cfg->locals_start_index + header->num_locals - 1);
348 int offset = vi->offset;
352 /* do not clear caller saved registers */
355 for (i = 0; i < header->num_locals; ++i) {
356 MonoVarInfo *rv = &VARINFO (cfg, cfg->locals_start_index + i);
359 int ind = 1 << rv->reg;
361 x86_alu_reg_reg (cfg->code, X86_XOR, rv->reg, rv->reg);
366 if (size == 1 || size == 2 || size == 4) {
367 x86_mov_membase_imm (cfg->code, X86_EBP, offset, 0, size);
375 for (k = 0; k < i; k++) {
376 x86_mov_membase_imm (cfg->code, X86_EBP, offset, 0, 4);
381 x86_mov_membase_imm (cfg->code, X86_EBP, offset, 0, 2);
385 x86_mov_membase_imm (cfg->code, X86_EBP, offset, 0, 1);
390 if (!mono_regset_reg_used (cfg->rs, X86_EDI))
391 x86_push_reg (cfg->code, X86_EDI);
392 x86_lea_membase (cfg->code, X86_EDI, X86_EBP, offset);
393 x86_alu_reg_reg (cfg->code, X86_XOR, X86_EAX, X86_EAX);
394 x86_mov_reg_imm (cfg->code, X86_ECX, i);
396 x86_prefix (cfg->code, X86_REP_PREFIX);
397 x86_stosl (cfg->code);
398 for (i = 0; i < j; i++)
399 x86_stosb (cfg->code);
400 if (!mono_regset_reg_used (cfg->rs, X86_EDI))
401 x86_pop_reg (cfg->code, X86_EDI);
405 x86_mov_membase_imm (cfg->code, X86_EBP, offset, 0, 2);
406 x86_mov_membase_imm (cfg->code, X86_EBP, offset + 2, 0, 1);
411 /* we always need to initialize object pointers */
413 for (i = 0; i < header->num_locals; ++i) {
414 MonoType *t = header->locals [i];
415 int offset = VARINFO (cfg, cfg->locals_start_index + i).offset;
418 x86_mov_membase_imm (cfg->code, X86_EBP, offset, 0, 4);
423 case MONO_TYPE_STRING:
424 case MONO_TYPE_CLASS:
425 case MONO_TYPE_ARRAY:
426 case MONO_TYPE_SZARRAY:
427 case MONO_TYPE_OBJECT:
428 x86_mov_membase_imm (cfg->code, X86_EBP, offset, 0, 4);
438 * arch_emit_epilogue:
439 * @cfg: pointer to status information
441 * Emits the function epilog.
444 arch_emit_epilogue (MonoFlowGraph *cfg)
448 * note: with trace and profiling the value on the FP stack may get clobbered.
450 if (mono_jit_trace_calls) {
451 x86_fld_reg (cfg->code, 0);
452 x86_alu_reg_imm (cfg->code, X86_SUB, X86_ESP, 8);
453 x86_fst_membase (cfg->code, X86_ESP, 0, TRUE, TRUE);
454 x86_push_reg (cfg->code, X86_EAX);
455 x86_push_reg (cfg->code, X86_EDX);
456 x86_push_imm (cfg->code, cfg->method);
457 x86_mov_reg_imm (cfg->code, X86_EAX, leave_method);
458 x86_call_reg (cfg->code, X86_EAX);
459 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 4);
460 x86_pop_reg (cfg->code, X86_EDX);
461 x86_pop_reg (cfg->code, X86_EAX);
462 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 8);
464 if (mono_jit_profile) {
465 x86_push_reg (cfg->code, X86_EAX);
466 x86_push_reg (cfg->code, X86_EDX);
467 x86_push_imm (cfg->code, cfg->method);
468 x86_mov_reg_imm (cfg->code, X86_EAX, mono_profiler_method_leave);
469 x86_call_reg (cfg->code, X86_EAX);
470 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 4);
471 x86_pop_reg (cfg->code, X86_EDX);
472 x86_pop_reg (cfg->code, X86_EAX);
476 if (mono_regset_reg_used (cfg->rs, X86_EBX)) {
477 x86_mov_reg_membase (cfg->code, X86_EBX, X86_EBP, pos, 4);
480 if (mono_regset_reg_used (cfg->rs, X86_EDI)) {
481 x86_mov_reg_membase (cfg->code, X86_EDI, X86_EBP, pos, 4);
484 if (mono_regset_reg_used (cfg->rs, X86_ESI)) {
485 x86_mov_reg_membase (cfg->code, X86_ESI, X86_EBP, pos, 4);
489 x86_leave (cfg->code);
494 arch_allocate_var (MonoFlowGraph *cfg, int size, int align, MonoValueKind kind, MonoValueType type)
498 mono_jit_stats.allocate_var++;
500 vi.range.last_use.abs_pos = 0;
501 vi.range.first_use.pos.bid = 0xffff;
502 vi.range.first_use.pos.tid = 0;
505 vi.varnum = cfg->varinfo->len;
507 if (size != sizeof (gpointer))
512 case MONO_LOCALVAR: {
513 cfg->locals_size += size;
514 cfg->locals_size += align - 1;
515 cfg->locals_size &= ~(align - 1);
517 SET_VARINFO (vi, type, kind, - cfg->locals_size, size);
518 g_array_append_val (cfg->varinfo, vi);
522 int arg_start = 8 + cfg->has_vtarg*4;
524 g_assert ((align & 3) == 0);
526 SET_VARINFO (vi, type, kind, cfg->args_size + arg_start, size);
527 g_array_append_val (cfg->varinfo, vi);
529 cfg->args_size += size;
531 cfg->args_size &= ~3;
535 g_assert_not_reached ();
538 return cfg->varinfo->len - 1;
542 mono_label_cfg (MonoFlowGraph *cfg)
546 for (i = 0; i < cfg->block_count; i++) {
547 GPtrArray *forest = cfg->bblocks [i].forest;
550 if (!cfg->bblocks [i].reached) /* unreachable code */
555 for (j = 0; j < top; j++) {
556 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
559 mbstate = mono_burg_label (t1, cfg);
562 if (mono_debug_format != MONO_DEBUG_FORMAT_NONE)
564 g_warning ("tree does not match");
565 mono_print_ctree (cfg, t1); printf ("\n\n");
567 mono_print_forest (cfg, forest);
568 g_assert_not_reached ();
577 tree_allocate_regs (MonoFlowGraph *cfg, MBTree *tree, int goal, MonoRegSet *rs,
578 guint8 exclude_mask, int *spillcount)
581 int ern = mono_burg_rule (tree->state, goal);
582 const guint16 *nts = mono_burg_nts [ern];
583 guint8 left_exclude_mask = 0, right_exclude_mask = 0;
586 #ifdef DEBUG_REGALLOC
587 printf ("tree_allocate_regs start %d %08x %d %d\n", tree->op, rs->free_mask, goal,
588 (nts [0] && kids [0] == tree));
591 mono_burg_kids (tree, ern, kids);
597 exclude_mask |= (1 << X86_ECX);
598 left_exclude_mask |= (1 << X86_ECX);
601 case MB_TERM_MUL_OVF:
602 case MB_TERM_MUL_OVF_UN:
607 if (goal == MB_NTERM_reg) {
608 left_exclude_mask |= (1 << X86_EDX);
609 right_exclude_mask |= (1 << X86_EDX) | (1 << X86_EAX);
616 if (nts [0] && kids [0] == tree) {
618 if (!tree_allocate_regs (cfg, kids [0], nts [0], rs, exclude_mask, spillcount))
620 /* special case reg: coni4 */
621 if (goal == MB_NTERM_reg) {
622 if (tree->reg1 == -1)
623 tree->reg1 = mono_regset_alloc_reg (rs, -1, exclude_mask);
624 if (tree->reg1 == -1)
646 if (nts [1]) { /* two kids */
648 if (nts [2]) /* we cant handle three kids */
649 g_assert_not_reached ();
651 if (!tree_allocate_regs (cfg, kids [0], nts [0], rs, left_exclude_mask, spillcount))
656 if (!tree_allocate_regs (cfg, kids [1], nts [1], rs, right_exclude_mask, spillcount)) {
658 #ifdef DEBUG_REGALLOC
659 printf ("tree_allocate_regs try 1 failed %d %d %d %d\n",
660 nts [1], kids [1]->reg1,
661 kids [1]->reg2,kids [1]->reg3);
665 if (kids [0]->reg1 != -1) {
666 right_exclude_mask |= 1 << kids [0]->reg1;
669 if (kids [0]->reg2 != -1) {
670 right_exclude_mask |= 1 << kids [0]->reg2;
673 if (kids [0]->reg3 != -1) {
674 right_exclude_mask |= 1 << kids [0]->reg3;
678 mono_regset_free_reg (rs, kids [0]->reg1);
679 mono_regset_free_reg (rs, kids [0]->reg2);
680 mono_regset_free_reg (rs, kids [0]->reg3);
682 kids [0]->spilled = 1;
684 if (!tree_allocate_regs (cfg, kids [1], nts [1], rs, right_exclude_mask, spillcount)) {
685 #ifdef DEBUG_REGALLOC
686 printf ("tree_allocate_regs try 2 failed\n");
690 #ifdef DEBUG_REGALLOC
691 printf ("tree_allocate_regs try 2 succesfull\n");
695 } else { /* one kid */
696 if (!tree_allocate_regs (cfg, kids [0], nts [0], rs, left_exclude_mask, spillcount))
702 for (i = 0; nts [i]; i++) {
703 mono_regset_free_reg (rs, kids [i]->reg1);
704 mono_regset_free_reg (rs, kids [i]->reg2);
705 mono_regset_free_reg (rs, kids [i]->reg3);
708 tree->emit = mono_burg_func [ern];
711 case MB_TERM_CALL_I4:
712 case MB_TERM_CALL_I8:
713 case MB_TERM_CALL_R8:
714 // case MB_TERM_CALL_VOID :
715 if ((tree->reg1 = mono_regset_alloc_reg (rs, X86_EAX, exclude_mask)) == -1)
717 if ((tree->reg2 = mono_regset_alloc_reg (rs, X86_EDX, exclude_mask)) == -1)
719 if ((tree->reg3 = mono_regset_alloc_reg (rs, X86_ECX, exclude_mask)) == -1)
727 case MB_TERM_MUL_OVF_UN:
732 if ((tree->reg1 = mono_regset_alloc_reg (rs, X86_EAX, exclude_mask)) == -1)
734 if ((tree->reg2 = mono_regset_alloc_reg (rs, X86_EDX, exclude_mask)) == -1)
738 if ((tree->reg1 = mono_regset_alloc_reg (rs, -1, exclude_mask)) == -1)
746 case MB_TERM_MUL_OVF:
747 case MB_TERM_MUL_OVF_UN:
752 if ((tree->reg1 = mono_regset_alloc_reg (rs, X86_EAX, exclude_mask)) == -1)
754 if ((tree->reg2 = mono_regset_alloc_reg (rs, X86_EDX, exclude_mask)) == -1)
758 if ((tree->reg1 = mono_regset_alloc_reg (rs, -1, exclude_mask)) == -1)
760 if ((tree->reg2 = mono_regset_alloc_reg (rs, -1, exclude_mask)) == -1)
766 /* fixme: allocate floating point registers */
770 if (tree->op == MB_TERM_ADD) {
771 if ((tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, exclude_mask)) == -1)
773 if ((tree->reg2 = mono_regset_alloc_reg (rs, tree->right->reg1, exclude_mask)) == -1)
779 if (tree->op == MB_TERM_ADD) {
780 if ((tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, exclude_mask)) == -1)
786 if (tree->op == MB_TERM_SHL ||
787 tree->op == MB_TERM_MUL) {
788 if ((tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, exclude_mask)) == -1)
797 #ifdef DEBUG_REGALLOC
798 printf ("tree_allocate_regs end %d %08x\n", tree->op, rs->free_mask);
804 arch_allocate_regs (MonoFlowGraph *cfg)
806 int i, j, max_spillcount = 0;
808 for (i = 0; i < cfg->block_count; i++) {
809 GPtrArray *forest = cfg->bblocks [i].forest;
812 if (!cfg->bblocks [i].reached) /* unreachable code */
817 for (j = 0; j < top; j++) {
818 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
820 #ifdef DEBUG_REGALLOC
821 printf ("arch_allocate_regs start %d:%d %08x\n", i, j, cfg->rs->free_mask);
823 if (!tree_allocate_regs (cfg, t1, 1, cfg->rs, 0, &spillcount)) {
824 mono_print_ctree (cfg, t1);
826 g_error ("register allocation failed");
829 max_spillcount = MAX (max_spillcount, spillcount);
831 #ifdef DEBUG_REGALLOC
832 printf ("arch_allocate_regs end %d:%d %08x\n", i, j, cfg->rs->free_mask);
834 g_assert (cfg->rs->free_mask == 0xffffffff);
838 /* allocate space for spilled regs */
840 cfg->spillvars = mono_mempool_alloc0 (cfg->mp, sizeof (gint) * max_spillcount);
841 cfg->spillcount = max_spillcount;
843 for (i = 0; i < max_spillcount; i++) {
845 spillvar = arch_allocate_var (cfg, sizeof (gpointer), sizeof (gpointer),
846 MONO_TEMPVAR, VAL_I32);
847 cfg->spillvars [i] = VARINFO (cfg, spillvar).offset;
852 tree_emit (int goal, MonoFlowGraph *cfg, MBTree *tree, int *spillcount)
855 int ern = mono_burg_rule (tree->state, goal);
856 const guint16 *nts = mono_burg_nts [ern];
860 mono_burg_kids (tree, ern, kids);
864 int spilloffset1, spilloffset2, spilloffset3;
867 g_assert_not_reached ();
869 tree_emit (nts [0], cfg, kids [0], spillcount);
871 if (kids [0]->spilled) {
873 printf ("SPILL_REGS %d %03x %s.%s:%s\n",
874 nts [0], cfg->code - cfg->start,
875 cfg->method->klass->name_space,
876 cfg->method->klass->name, cfg->method->name);
878 mono_print_ctree (cfg, kids [0]);printf ("\n\n");
884 if (kids [0]->reg1 != -1) {
885 spilloffset1 = cfg->spillvars [(*spillcount)++];
886 x86_mov_membase_reg (cfg->code, X86_EBP, spilloffset1,
889 if (kids [0]->reg2 != -1) {
890 spilloffset2 = cfg->spillvars [(*spillcount)++];
891 x86_mov_membase_reg (cfg->code, X86_EBP, spilloffset2,
894 if (kids [0]->reg3 != -1) {
895 spilloffset3 = cfg->spillvars [(*spillcount)++];
896 x86_mov_membase_reg (cfg->code, X86_EBP, spilloffset3,
901 tree_emit (nts [1], cfg, kids [1], spillcount);
903 if (kids [0]->spilled) {
906 printf ("RELOAD_REGS %03x %s.%s:%s\n",
907 cfg->code - cfg->start,
908 cfg->method->klass->name_space,
909 cfg->method->klass->name, cfg->method->name);
912 if (kids [0]->reg3 != -1)
913 x86_mov_reg_membase (cfg->code, kids [0]->reg3, X86_EBP,
915 if (kids [0]->reg2 != -1)
916 x86_mov_reg_membase (cfg->code, kids [0]->reg2, X86_EBP,
918 if (kids [0]->reg1 != -1)
919 x86_mov_reg_membase (cfg->code, kids [0]->reg1, X86_EBP,
923 tree_emit (nts [0], cfg, kids [0], spillcount);
927 g_assert ((*spillcount) <= cfg->spillcount);
929 tree->addr = offset = cfg->code - cfg->start;
931 /* we assume an instruction uses a maximum of 128 bytes */
932 if ((cfg->code_size - offset) <= 128) {
933 int add = MIN (cfg->code_size, 128);
934 cfg->code_size += add;
935 mono_jit_stats.code_reallocs++;
936 cfg->start = g_realloc (cfg->start, cfg->code_size);
937 g_assert (cfg->start);
938 cfg->code = cfg->start + offset;
941 if ((emit = mono_burg_func [ern]))
944 g_assert ((cfg->code - cfg->start) < cfg->code_size);
948 mono_emit_cfg (MonoFlowGraph *cfg)
950 int i, j, spillcount;
952 for (i = 0; i < cfg->block_count; i++) {
953 MonoBBlock *bb = &cfg->bblocks [i];
954 GPtrArray *forest = bb->forest;
957 if (!bb->reached) /* unreachable code */
962 bb->addr = cfg->code - cfg->start;
964 for (j = 0; j < top; j++) {
965 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
968 tree_emit (1, cfg, t1, &spillcount);
972 cfg->epilog = cfg->code - cfg->start;
976 mono_compute_branches (MonoFlowGraph *cfg)
984 for (j = 0; j < cfg->block_count; j++) {
985 MonoBBlock *bb = &cfg->bblocks [j];
986 GPtrArray *forest = bb->forest;
989 if (!bb->reached) /* unreachable code */
994 for (i = 0; i < top; i++) {
995 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, i);
997 if (t1->op == MB_TERM_SWITCH) {
998 MonoBBlock **jt = (MonoBBlock **)t1->data.p;
999 guint32 *rt = (guint32 *)t1->data.p;
1000 int m = *((guint32 *)t1->data.p) + 1;
1003 for (k = 1; k <= m; k++)
1004 rt [k] = (int)(jt [k]->addr + cfg->start);
1006 /* emit the switch instruction again to update addresses */
1007 cfg->code = cfg->start + t1->addr;
1008 ((MBEmitFunc)t1->emit) (t1, cfg);
1015 for (ji = cfg->jump_info; ji; ji = ji->next) {
1016 unsigned char *ip = GUINT_TO_POINTER (GPOINTER_TO_UINT (ji->ip) + cfg->start);
1017 unsigned char *target;
1020 case MONO_JUMP_INFO_BB:
1021 target = ji->data.bb->addr + cfg->start;
1023 case MONO_JUMP_INFO_ABS:
1024 target = ji->data.target;
1026 case MONO_JUMP_INFO_EPILOG:
1027 target = cfg->epilog + cfg->start;
1029 case MONO_JUMP_INFO_IP:
1030 *(unsigned char**)ip = ip;
1033 g_assert_not_reached ();
1035 x86_patch (ip, target);
1040 mono_add_jump_info (MonoFlowGraph *cfg, gpointer ip, MonoJumpInfoType type, gpointer target)
1042 MonoJumpInfo *ji = mono_mempool_alloc (cfg->mp, sizeof (MonoJumpInfo));
1045 ji->ip = GUINT_TO_POINTER (GPOINTER_TO_UINT (ip) - GPOINTER_TO_UINT (cfg->start));
1046 ji->data.target = target;
1047 ji->next = cfg->jump_info;
1049 cfg->jump_info = ji;
1053 arch_jit_compile_cfg (MonoDomain *target_domain, MonoFlowGraph *cfg)
1056 guint32 ls_used_mask = 0;
1057 MonoMethod *method = cfg->method;
1059 ji = mono_mempool_alloc0 (target_domain->mp, sizeof (MonoJitInfo));
1061 cfg->rs = mono_regset_new (X86_NREG);
1062 mono_regset_reserve_reg (cfg->rs, X86_ESP);
1063 mono_regset_reserve_reg (cfg->rs, X86_EBP);
1065 /* we can use this regs for global register allocation */
1066 mono_regset_reserve_reg (cfg->rs, X86_EBX);
1067 mono_regset_reserve_reg (cfg->rs, X86_ESI);
1069 if (mono_use_linear_scan) {
1070 mono_linear_scan (cfg, &ls_used_mask);
1071 cfg->rs->used_mask |= ls_used_mask;
1074 if (mono_jit_dump_forest) {
1076 printf ("FOREST %s.%s:%s\n", method->klass->name_space,
1077 method->klass->name, method->name);
1078 for (i = 0; i < cfg->block_count; i++) {
1079 printf ("BLOCK %d:\n", i);
1080 mono_print_forest (cfg, cfg->bblocks [i].forest);
1084 if (!mono_label_cfg (cfg))
1087 arch_allocate_regs (cfg);
1089 /* align to 8 byte boundary */
1090 cfg->locals_size += 7;
1091 cfg->locals_size &= ~7;
1093 arch_emit_prologue (cfg);
1094 cfg->prologue_end = cfg->code - cfg->start;
1095 mono_emit_cfg (cfg);
1096 arch_emit_epilogue (cfg);
1097 cfg->epilogue_end = cfg->code - cfg->start;
1099 mono_compute_branches (cfg);
1101 ji->code_size = cfg->code - cfg->start;
1102 ji->used_regs = cfg->rs->used_mask;
1103 ji->method = method;
1104 ji->code_start = cfg->start;