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/mono-endian.h>
20 #include <mono/arch/x86/x86-codegen.h>
27 enter_method (MonoMethod *method, gpointer ebp)
33 printf ("ENTER: %s.%s::%s\n(", method->klass->name_space,
34 method->klass->name, method->name);
37 if (((int)ebp & 3) != 0) {
38 g_error ("unaligned stack detected (%p)", ebp);
43 if (ISSTRUCT (method->signature->ret)) {
46 g_assert (!method->signature->ret->byref);
48 size = mono_type_stack_size (method->signature->ret, &align);
50 printf ("VALUERET:%p, ", *((gpointer *)ebp));
51 ebp += sizeof (gpointer);
54 if (method->signature->hasthis) {
55 if (method->klass->valuetype) {
56 printf ("value:%p, ", *((gpointer *)ebp));
58 o = *((MonoObject **)ebp);
62 class = o->vtable->klass;
64 if (class == mono_defaults.string_class) {
65 printf ("this:[STRING:%p:%s], ", o, mono_string_to_utf8 ((MonoString *)o));
67 printf ("this:%p[%s.%s], ", o, class->name_space, class->name);
70 ebp += sizeof (gpointer);
73 for (i = 0; i < method->signature->param_count; ++i) {
74 MonoType *type = method->signature->params [i];
76 size = mono_type_stack_size (type, &align);
79 printf ("[BYREF:%p], ", *((gpointer *)ebp));
80 } else switch (type->type) {
82 case MONO_TYPE_BOOLEAN:
92 printf ("%d, ", *((int *)(ebp)));
94 case MONO_TYPE_STRING: {
95 MonoString *s = *((MonoString **)ebp);
97 g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
98 printf ("[STRING:%p:%s], ", s, mono_string_to_utf8 (s));
100 printf ("[STRING:null], ");
103 case MONO_TYPE_CLASS:
104 case MONO_TYPE_OBJECT: {
105 o = *((MonoObject **)ebp);
107 class = o->vtable->klass;
109 if (class == mono_defaults.string_class) {
110 printf ("[STRING:%p:%s], ", o, mono_string_to_utf8 ((MonoString *)o));
111 } else if (class == mono_defaults.int32_class) {
112 printf ("[INT32:%p:%d], ", o, *(gint32 *)((gpointer)o + sizeof (MonoObject)));
114 printf ("[%s.%s:%p], ", class->name_space, class->name, o);
116 printf ("%p, ", *((gpointer *)(ebp)));
121 case MONO_TYPE_FNPTR:
122 case MONO_TYPE_ARRAY:
123 case MONO_TYPE_SZARRAY:
124 printf ("%p, ", *((gpointer *)(ebp)));
127 printf ("%lld, ", *((gint64 *)(ebp)));
130 printf ("%f, ", *((float *)(ebp)));
133 printf ("%f, ", *((double *)(ebp)));
135 case MONO_TYPE_VALUETYPE:
137 for (j = 0; j < size; j++)
138 printf ("%02x,", *((guint8*)ebp +j));
145 g_assert (align == 4);
147 ebp = (gpointer)((unsigned)ebp & ~(3));
154 leave_method (MonoMethod *method, int edx, int eax, double test)
158 printf ("LEAVE: %s.%s::%s ", method->klass->name_space,
159 method->klass->name, method->name);
161 switch (method->signature->ret->type) {
164 case MONO_TYPE_BOOLEAN:
166 printf ("TRUE:%d", eax);
180 printf ("EAX=%d", eax);
182 case MONO_TYPE_STRING: {
183 MonoString *s = (MonoString *)eax;
186 g_assert (((MonoObject *)s)->vtable->klass == mono_defaults.string_class);
187 printf ("[STRING:%p:%s]", s, mono_string_to_utf8 (s));
189 printf ("[STRING:null], ");
192 case MONO_TYPE_OBJECT: {
193 MonoObject *o = (MonoObject *)eax;
196 if (o->vtable->klass == mono_defaults.boolean_class) {
197 printf ("[BOOLEAN:%p:%d]", o, *((guint8 *)o + sizeof (MonoObject)));
198 } else if (o->vtable->klass == mono_defaults.int32_class) {
199 printf ("[INT32:%p:%d]", o, *((gint32 *)((gpointer)o + sizeof (MonoObject))));
201 printf ("[%s.%s:%p]", o->vtable->klass->name_space, o->vtable->klass->name, o);
203 printf ("[OBJECT:%p]", o);
207 case MONO_TYPE_CLASS:
209 case MONO_TYPE_FNPTR:
210 case MONO_TYPE_ARRAY:
211 case MONO_TYPE_SZARRAY:
212 printf ("EAX=%p", (gpointer)eax);
215 *((gint32 *)&l) = eax;
216 *((gint32 *)&l + 1) = edx;
217 printf ("EAX/EDX=%lld", l);
220 printf ("FP=%f\n", test);
223 printf ("(unknown return type)");
230 * arch_emit_prologue:
231 * @cfg: pointer to status information
233 * Emits the function prolog.
236 arch_emit_prologue (MonoFlowGraph *cfg)
238 x86_push_reg (cfg->code, X86_EBP);
239 x86_mov_reg_reg (cfg->code, X86_EBP, X86_ESP, 4);
241 if (cfg->locals_size)
242 x86_alu_reg_imm (cfg->code, X86_SUB, X86_ESP, cfg->locals_size);
244 if (mono_regset_reg_used (cfg->rs, X86_EBX))
245 x86_push_reg (cfg->code, X86_EBX);
247 if (mono_regset_reg_used (cfg->rs, X86_EDI))
248 x86_push_reg (cfg->code, X86_EDI);
250 if (mono_regset_reg_used (cfg->rs, X86_ESI))
251 x86_push_reg (cfg->code, X86_ESI);
253 if (mono_jit_trace_calls) {
254 x86_push_reg (cfg->code, X86_EBP);
255 x86_push_imm (cfg->code, cfg->method);
256 x86_mov_reg_imm (cfg->code, X86_EAX, enter_method);
257 x86_call_reg (cfg->code, X86_EAX);
258 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 8);
263 * arch_emit_epilogue:
264 * @cfg: pointer to status information
266 * Emits the function epilog.
269 arch_emit_epilogue (MonoFlowGraph *cfg)
271 if (mono_jit_trace_calls) {
272 x86_fld_reg (cfg->code, 0);
273 x86_alu_reg_imm (cfg->code, X86_SUB, X86_ESP, 8);
274 x86_fst_membase (cfg->code, X86_ESP, 0, TRUE, TRUE);
275 x86_push_reg (cfg->code, X86_EAX);
276 x86_push_reg (cfg->code, X86_EDX);
277 x86_push_imm (cfg->code, cfg->method);
278 x86_mov_reg_imm (cfg->code, X86_EAX, leave_method);
279 x86_call_reg (cfg->code, X86_EAX);
280 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 4);
281 x86_pop_reg (cfg->code, X86_EDX);
282 x86_pop_reg (cfg->code, X86_EAX);
283 x86_alu_reg_imm (cfg->code, X86_ADD, X86_ESP, 8);
286 if (mono_regset_reg_used (cfg->rs, X86_ESI))
287 x86_pop_reg (cfg->code, X86_ESI);
289 if (mono_regset_reg_used (cfg->rs, X86_EDI))
290 x86_pop_reg (cfg->code, X86_EDI);
292 if (mono_regset_reg_used (cfg->rs, X86_EBX))
293 x86_pop_reg (cfg->code, X86_EBX);
295 x86_leave (cfg->code);
300 * get_unbox_trampoline:
303 * when value type methods are called through the vtable we need to unbox the
304 * this argument. This method returns a pointer to a trampoline which does
305 * unboxing before calling the method
308 get_unbox_trampoline (MonoMethod *m)
310 gpointer p = arch_compile_method (m);
311 guint8 *code, *start;
314 if (!m->signature->ret->byref && m->signature->ret->type == MONO_TYPE_VALUETYPE)
317 start = code = g_malloc (16);
319 x86_alu_membase_imm (code, X86_ADD, X86_ESP, this_pos, sizeof (MonoObject));
320 x86_jump_code (code, p);
321 g_assert ((code - start) < 16);
327 * x86_magic_trampoline:
328 * @eax: saved x86 register
329 * @ecx: saved x86 register
330 * @edx: saved x86 register
331 * @esi: saved x86 register
332 * @edi: saved x86 register
333 * @ebx: saved x86 register
334 * @code: pointer into caller code
335 * @method: the method to translate
337 * This method is called by the trampoline functions for virtual
338 * methods. It inspects the caller code to find the address of the
339 * vtable slot, then calls the JIT compiler and writes the address
340 * of the compiled method back to the vtable. All virtual methods
341 * are called with: x86_call_membase (inst, basereg, disp). We always
342 * use 32 bit displacement to ensure that the length of the call
343 * instruction is 6 bytes. We need to get the value of the basereg
344 * and the constant displacement.
347 x86_magic_trampoline (int eax, int ecx, int edx, int esi, int edi,
348 int ebx, const guint8 *code, MonoMethod *m)
354 /* go to the start of the call instruction
356 * address_byte = (m << 6) | (o << 3) | reg
357 * call opcode: 0xff address_byte displacement
362 if ((code [3] == 0xff) && ((code [4] & 0x18) == 0x10) && ((code [4] >> 6) == 1)) {
363 reg = code [4] & 0x07;
364 disp = (signed char)code [5];
366 if ((code [0] == 0xff) && ((code [1] & 0x18) == 0x10) && ((code [1] >> 6) == 2)) {
367 reg = code [1] & 0x07;
368 disp = *((gint32*)(code + 2));
369 } else if ((code [1] == 0xe8)) {
370 gpointer addr = arch_compile_method (m);
372 *((guint32*)(code + 2)) = (guint)addr - ((guint)code + 1) - 5;
375 printf ("%x %x %x %x\n", code [0], code [1], code [2], code [3]);
376 g_assert_not_reached ();
400 g_assert_not_reached ();
405 if (m->klass->valuetype) {
406 return *((gpointer *)o) = get_unbox_trampoline (m);
408 return *((gpointer *)o) = arch_compile_method (m);
412 * arch_create_jit_trampoline:
413 * @method: pointer to the method info
415 * Creates a trampoline function for virtual methods. If the created
416 * code is called it first starts JIT compilation of method,
417 * and then calls the newly created method. I also replaces the
418 * corresponding vtable entry (see x86_magic_trampoline).
420 * Returns: a pointer to the newly created code
423 arch_create_jit_trampoline (MonoMethod *method)
426 static guint8 *vc = NULL;
432 vc = buf = g_malloc (24);
434 /* push the return address onto the stack */
435 x86_push_membase (buf, X86_ESP, 4);
437 /* save all register values */
438 x86_push_reg (buf, X86_EBX);
439 x86_push_reg (buf, X86_EDI);
440 x86_push_reg (buf, X86_ESI);
441 x86_push_reg (buf, X86_EDX);
442 x86_push_reg (buf, X86_ECX);
443 x86_push_reg (buf, X86_EAX);
445 x86_call_code (buf, x86_magic_trampoline);
446 x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 8*4);
448 /* call the compiled method */
449 x86_jump_reg (buf, X86_EAX);
451 g_assert ((buf - vc) <= 24);
454 code = buf = g_malloc (16);
455 x86_push_imm (buf, method);
456 x86_jump_code (buf, vc);
457 g_assert ((buf - code) <= 16);
463 mono_label_cfg (MonoFlowGraph *cfg)
467 for (i = 0; i < cfg->block_count; i++) {
468 GPtrArray *forest = cfg->bblocks [i].forest;
471 if (!cfg->bblocks [i].reached) /* unreachable code */
476 for (j = 0; j < top; j++) {
477 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
480 mbstate = mono_burg_label (t1, cfg);
483 if (mono_debug_handle)
485 g_warning ("tree does not match");
486 mono_print_ctree (t1); printf ("\n\n");
488 mono_print_forest (forest);
489 g_assert_not_reached ();
496 tree_preallocate_regs (MBTree *tree, int goal, MonoRegSet *rs)
499 case MB_TERM_CALL_I4:
500 case MB_TERM_CALL_I8:
501 case MB_TERM_CALL_R8:
502 // case MB_TERM_CALL_VOID :
503 tree->reg1 = mono_regset_alloc_reg (rs, X86_EAX, tree->exclude_mask);
504 tree->reg2 = mono_regset_alloc_reg (rs, X86_EDX, tree->exclude_mask);
505 tree->reg3 = mono_regset_alloc_reg (rs, X86_ECX, tree->exclude_mask);
512 case MB_NTERM_lreg: {
517 tree->exclude_mask |= (1 << X86_ECX);
518 tree->left->exclude_mask |= (1 << X86_ECX);
521 case MB_TERM_MUL_OVF:
522 case MB_TERM_MUL_OVF_UN:
527 tree->reg1 = mono_regset_alloc_reg (rs, X86_EAX, tree->exclude_mask);
528 tree->reg2 = mono_regset_alloc_reg (rs, X86_EDX, tree->exclude_mask);
529 if (goal == MB_NTERM_reg) {
530 tree->left->exclude_mask |= (1 << X86_EDX);
531 tree->right->exclude_mask |= (1 << X86_EDX) | (1 << X86_EAX);
545 tree_allocate_regs (MBTree *tree, int goal, MonoRegSet *rs)
548 int ern = mono_burg_rule (tree->state, goal);
549 const guint16 *nts = mono_burg_nts [ern];
552 mono_burg_kids (tree, ern, kids);
554 //printf ("RALLOC START %d %p %d\n", tree->op, rs->free_mask, goal);
556 if (nts [0] && kids [0] == tree) {
558 tree_allocate_regs (kids [0], nts [0], rs);
562 for (i = 0; nts [i]; i++)
563 tree_preallocate_regs (kids [i], nts [i], rs);
565 for (i = 0; nts [i]; i++)
566 tree_allocate_regs (kids [i], nts [i], rs);
568 for (i = 0; nts [i]; i++) {
569 mono_regset_free_reg (rs, kids [i]->reg1);
570 mono_regset_free_reg (rs, kids [i]->reg2);
571 mono_regset_free_reg (rs, kids [i]->reg3);
576 if (tree->reg1 < 0) {
577 tree->reg1 = mono_regset_alloc_reg (rs, -1, tree->exclude_mask);
578 g_assert (tree->reg1 != -1);
583 if (tree->reg1 < 0) {
584 tree->reg1 = mono_regset_alloc_reg (rs, -1, tree->exclude_mask);
585 g_assert (tree->reg1 != -1);
587 if (tree->reg2 < 0) {
588 tree->reg2 = mono_regset_alloc_reg (rs, -1, tree->exclude_mask);
589 g_assert (tree->reg2 != -1);
594 /* fixme: allocate floating point registers */
598 if (tree->op == MB_TERM_ADD) {
599 tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, tree->exclude_mask);
600 tree->reg2 = mono_regset_alloc_reg (rs, tree->right->reg1, tree->exclude_mask);
605 if (tree->op == MB_TERM_ADD) {
606 tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, tree->exclude_mask);
611 if (tree->op == MB_TERM_SHL ||
612 tree->op == MB_TERM_MUL) {
613 tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, tree->exclude_mask);
621 //printf ("RALLOC END %d %p\n", tree->op, rs->free_mask);
622 tree->emit = mono_burg_func [ern];
626 arch_allocate_regs (MonoFlowGraph *cfg)
630 for (i = 0; i < cfg->block_count; i++) {
631 GPtrArray *forest = cfg->bblocks [i].forest;
634 if (!cfg->bblocks [i].reached) /* unreachable code */
639 for (j = 0; j < top; j++) {
640 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
641 //printf ("AREGSTART %d:%d %p\n", i, j, cfg->rs->free_mask);
642 tree_allocate_regs (t1, 1, cfg->rs);
643 //printf ("AREGENDT %d:%d %p\n", i, j, cfg->rs->free_mask);
644 g_assert (cfg->rs->free_mask == 0xffffffff);
650 tree_emit (int goal, MonoFlowGraph *cfg, MBTree *tree)
653 int i, ern = mono_burg_rule (tree->state, goal);
654 const guint16 *nts = mono_burg_nts [ern];
658 mono_burg_kids (tree, ern, kids);
660 for (i = 0; nts [i]; i++)
661 tree_emit (nts [i], cfg, kids [i]);
663 tree->addr = offset = cfg->code - cfg->start;
665 // we assume an instruction uses a maximum of 128 bytes
666 if ((cfg->code_size - offset) <= 128) {
667 int add = MIN ((cfg->code_size * 2), 1024);
669 cfg->code_size += add;
670 cfg->start = g_realloc (cfg->start, cfg->code_size);
671 g_assert (cfg->start);
672 cfg->code = cfg->start + offset;
675 if ((emit = mono_burg_func [ern]))
678 g_assert ((cfg->code - cfg->start) < cfg->code_size);
682 mono_emit_cfg (MonoFlowGraph *cfg)
686 for (i = 0; i < cfg->block_count; i++) {
687 MonoBBlock *bb = &cfg->bblocks [i];
688 GPtrArray *forest = bb->forest;
691 if (!bb->reached) /* unreachable code */
696 bb->addr = cfg->code - cfg->start;
698 for (j = 0; j < top; j++) {
699 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
701 tree_emit (1, cfg, t1);
705 cfg->epilog = cfg->code - cfg->start;
709 mono_compute_branches (MonoFlowGraph *cfg)
716 for (j = 0; j < cfg->block_count; j++) {
717 MonoBBlock *bb = &cfg->bblocks [j];
718 GPtrArray *forest = bb->forest;
721 if (!bb->reached) /* unreachable code */
726 for (i = 0; i < top; i++) {
727 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, i);
731 if (t1->op == MB_TERM_SWITCH) {
732 MonoBBlock **jt = (MonoBBlock **)t1->data.p;
733 guint32 *rt = (guint32 *)t1->data.p;
735 int m = *((guint32 *)t1->data.p) + 1;
738 for (j = 1; j <= m; j++)
739 rt [j] = (int)(jt [j]->addr + cfg->start);
742 /* emit the jump instruction again to update addresses */
743 cfg->code = cfg->start + t1->addr;
744 ((MBEmitFunc)t1->emit) (t1, cfg);
754 match_debug_method (MonoMethod* method)
756 GList *tmp = mono_debug_methods;
758 for (; tmp; tmp = tmp->next) {
759 if (strcmp (method->name, tmp->data) == 0) {
767 * arch_compile_method:
768 * @method: pointer to the method info
770 * JIT compilation of a single method.
772 * Returns: a pointer to the newly created code.
775 arch_compile_method (MonoMethod *method)
777 MonoDomain *domain = mono_domain_get ();
779 MonoMemPool *mp = mono_mempool_new ();
782 g_assert (!(method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL));
783 g_assert (!(method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL));
785 if ((addr = g_hash_table_lookup (domain->jit_code_hash, method)))
788 if (mono_jit_trace_calls || mono_jit_dump_asm || mono_jit_dump_forest) {
789 printf ("Start JIT compilation of %s.%s:%s\n", method->klass->name_space,
790 method->klass->name, method->name);
793 if (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) {
794 MonoClassField *field;
795 const char *name = method->name;
796 static guint target_offset = 0;
797 static guint method_offset = 0;
799 gboolean delegate = FALSE;
801 if (method->klass->parent &&
802 method->klass->parent->parent == mono_defaults.delegate_class)
805 if (!target_offset) {
806 mono_class_init (mono_defaults.delegate_class);
808 field = mono_class_get_field_from_name (mono_defaults.delegate_class, "m_target");
809 target_offset = field->offset;
810 field = mono_class_get_field_from_name (mono_defaults.delegate_class, "method_ptr");
811 method_offset = field->offset;
814 if (delegate && *name == '.' && (strcmp (name, ".ctor") == 0)) {
815 addr = code = g_malloc (32);
816 x86_push_reg (code, X86_EBP);
817 x86_mov_reg_reg (code, X86_EBP, X86_ESP, 4);
819 /* load the this pointer */
820 x86_mov_reg_membase (code, X86_EAX, X86_EBP, 8, 4);
821 /* load m_target arg */
822 x86_mov_reg_membase (code, X86_EDX, X86_EBP, 12, 4);
824 x86_mov_membase_reg (code, X86_EAX, target_offset, X86_EDX, 4);
825 /* load method_ptr arg */
826 x86_mov_reg_membase (code, X86_EDX, X86_EBP, 16, 4);
827 /* store method_ptr */
828 x86_mov_membase_reg (code, X86_EAX, method_offset, X86_EDX, 4);
833 g_assert ((code - (guint8*)addr) < 32);
835 } else if (delegate && *name == 'I' && (strcmp (name, "Invoke") == 0)) {
836 MonoMethodSignature *csig = method->signature;
837 int i, arg_size, target, this_pos = 4;
840 if (csig->ret->type == MONO_TYPE_VALUETYPE) {
841 g_assert (!csig->ret->byref);
846 if (csig->param_count) {
849 for (i = 0; i < csig->param_count; ++i) {
850 arg_size += mono_type_stack_size (csig->params [i], &align);
851 g_assert (align == 4);
855 addr = g_malloc (64 + arg_size);
857 for (i = 0; i < 2; i ++) {
861 /* load the this pointer */
862 x86_mov_reg_membase (code, X86_EAX, X86_ESP, this_pos, 4);
864 x86_mov_reg_membase (code, X86_EDX, X86_EAX, target_offset, 4);
865 /* check if zero (static method call without this pointer) */
866 x86_alu_reg_imm (code, X86_CMP, X86_EDX, 0);
867 x86_branch32 (code, X86_CC_EQ, target, TRUE);
870 /* virtual delegate methods: we have to replace the this pointer
871 * withe the actual target */
872 x86_mov_membase_reg (code, X86_ESP, this_pos, X86_EDX, 4);
873 /* jump to method_ptr() */
874 x86_jump_membase (code, X86_EAX, method_offset);
876 /* static delegate methods: we have to remove the this pointer
877 * from the activation frame - I do this do creating a new
878 * stack frame an copy all arguments except the this pointer */
880 target = code - source;
881 g_assert ((arg_size & 3) == 0);
882 for (j = 0; j < (arg_size>>2); j++) {
883 x86_push_membase (code, X86_ESP, (arg_size + this_pos));
887 x86_push_membase (code, X86_ESP, (arg_size + 4));
889 x86_call_membase (code, X86_EAX, method_offset);
891 x86_alu_reg_imm (code, X86_ADD, X86_ESP, arg_size + 4);
893 x86_alu_reg_imm (code, X86_ADD, X86_ESP, arg_size);
899 g_assert ((code - (guint8*)addr) < (64 + arg_size));
902 if (mono_debug_handle)
904 g_error ("Don't know how to exec runtime method %s.%s::%s",
905 method->klass->name_space, method->klass->name, method->name);
909 MonoMethodHeader *header = ((MonoMethodNormal *)method)->header;
910 MonoJitInfo *ji = g_new0 (MonoJitInfo, 1);
912 cfg = mono_cfg_new (method, mp);
914 mono_analyze_flow (cfg);
918 mono_analyze_stack (cfg);
922 cfg->rs = mono_regset_new (X86_NREG);
923 mono_regset_reserve_reg (cfg->rs, X86_ESP);
924 mono_regset_reserve_reg (cfg->rs, X86_EBP);
926 cfg->code_size = 256000;
927 cfg->start = cfg->code = g_malloc (cfg->code_size);
929 if (match_debug_method (method))
930 x86_breakpoint (cfg->code);
932 if (mono_jit_dump_forest) {
934 printf ("FOREST %s.%s:%s\n", method->klass->name_space,
935 method->klass->name, method->name);
936 for (i = 0; i < cfg->block_count; i++) {
937 printf ("BLOCK %d:\n", i);
938 mono_print_forest (cfg->bblocks [i].forest);
942 mono_label_cfg (cfg);
946 arch_allocate_regs (cfg);
948 /* align to 8 byte boundary */
949 cfg->locals_size += 7;
950 cfg->locals_size &= ~7;
952 arch_emit_prologue (cfg);
954 arch_emit_epilogue (cfg);
958 mono_compute_branches (cfg);
960 if (mono_jit_dump_asm) {
961 char *id = g_strdup_printf ("%s.%s_%s", method->klass->name_space,
962 method->klass->name, method->name);
963 mono_disassemble_code (cfg->start, cfg->code - cfg->start, id);
966 if (mono_debug_handle)
967 mono_debug_add_method (mono_debug_handle, cfg);
969 ji->code_size = cfg->code - cfg->start;
970 ji->used_regs = cfg->rs->used_mask;
972 ji->code_start = addr;
973 mono_jit_info_table_add (mono_jit_info_table, ji);
975 if (header->num_clauses) {
976 int i, start_block, end_block;
978 ji->num_clauses = header->num_clauses;
979 ji->clauses = g_new0 (MonoJitExceptionInfo, header->num_clauses);
981 for (i = 0; i < header->num_clauses; i++) {
982 MonoExceptionClause *ec = &header->clauses [i];
983 MonoJitExceptionInfo *ei = &ji->clauses [i];
985 ei->flags = ec->flags;
986 ei->token_or_filter = ec->token_or_filter;
988 g_assert (cfg->bcinfo [ec->try_offset].is_block_start);
989 start_block = cfg->bcinfo [ec->try_offset].block_id;
990 end_block = cfg->bcinfo [ec->try_offset + ec->try_len].block_id;
991 g_assert (cfg->bcinfo [ec->try_offset + ec->try_len].is_block_start);
993 ei->try_start = cfg->start + cfg->bblocks [start_block].addr;
994 ei->try_end = cfg->start + cfg->bblocks [end_block].addr;
996 g_assert (cfg->bcinfo [ec->handler_offset].is_block_start);
997 start_block = cfg->bcinfo [ec->handler_offset].block_id;
998 ei->handler_start = cfg->start + cfg->bblocks [start_block].addr;
1000 //printf ("TEST %x %x %x\n", ei->try_start, ei->try_end, ei->handler_start);
1004 mono_regset_free (cfg->rs);
1006 mono_cfg_free (cfg);
1008 mono_mempool_destroy (mp);
1012 if (mono_jit_trace_calls || mono_jit_dump_asm || mono_jit_dump_forest) {
1013 printf ("END JIT compilation of %s.%s:%s %p %p\n", method->klass->name_space,
1014 method->klass->name, method->name, method, addr);
1017 g_hash_table_insert (domain->jit_code_hash, method, addr);
1023 * arch_get_restore_context:
1025 * Returns a pointer to a method which restores a previously saved sigcontext.
1028 arch_get_restore_context ()
1030 static guint8 *start = NULL;
1036 /* restore_contect (struct sigcontext *ctx) */
1037 /* we do not restore X86_EAX, X86_EDX */
1039 start = code = malloc (1024);
1042 x86_mov_reg_membase (code, X86_EAX, X86_ESP, 4, 4);
1044 /* get return address, stored in EDX */
1045 x86_mov_reg_membase (code, X86_EDX, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, eip), 4);
1048 x86_mov_reg_membase (code, X86_EBX, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ebx), 4);
1050 x86_mov_reg_membase (code, X86_EDI, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, edi), 4);
1052 x86_mov_reg_membase (code, X86_ESI, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, esi), 4);
1054 x86_mov_reg_membase (code, X86_ESP, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, esp), 4);
1056 x86_mov_reg_membase (code, X86_EBP, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ebp), 4);
1057 /* restore ECX. the exception object is passed here to the catch handler */
1058 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ecx), 4);
1060 /* jump to the saved IP */
1061 x86_jump_reg (code, X86_EDX);
1067 * arch_get_call_finally:
1069 * Returns a pointer to a method which calls a finally handler.
1072 arch_get_call_finally ()
1074 static guint8 start [28];
1075 static int inited = 0;
1082 /* call_finally (struct sigcontext *ctx, unsigned long eip) */
1085 x86_push_reg (code, X86_EBP);
1086 x86_mov_reg_reg (code, X86_EBP, X86_ESP, 4);
1087 x86_push_reg (code, X86_EBX);
1088 x86_push_reg (code, X86_EDI);
1089 x86_push_reg (code, X86_ESI);
1092 x86_mov_reg_membase (code, X86_EAX, X86_EBP, 8, 4);
1094 x86_mov_reg_membase (code, X86_ECX, X86_EBP, 12, 4);
1096 x86_push_reg (code, X86_EBP);
1098 x86_mov_reg_membase (code, X86_EBP, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ebp), 4);
1099 /* call the handler */
1100 x86_call_reg (code, X86_ECX);
1102 x86_pop_reg (code, X86_EBP);
1103 /* restore saved regs */
1104 x86_pop_reg (code, X86_ESI);
1105 x86_pop_reg (code, X86_EDI);
1106 x86_pop_reg (code, X86_EBX);
1110 g_assert ((code - start) < 28);
1115 * arch_handle_exception:
1116 * @ctx: saved processor state
1120 arch_handle_exception (struct sigcontext *ctx, gpointer obj)
1122 MonoDomain *domain = mono_domain_get ();
1124 gpointer ip = (gpointer)ctx->eip;
1125 static void (*restore_context) (struct sigcontext *);
1126 static void (*call_finally) (struct sigcontext *, unsigned long);
1128 g_assert (ctx != NULL);
1129 g_assert (obj != NULL);
1131 ji = mono_jit_info_table_find (mono_jit_info_table, ip);
1133 if (!restore_context)
1134 restore_context = arch_get_restore_context ();
1137 call_finally = arch_get_call_finally ();
1139 if (ji) { /* we are inside managed code */
1140 MonoMethod *m = ji->method;
1144 if (ji->num_clauses) {
1147 g_assert (ji->clauses);
1149 for (i = 0; i < ji->num_clauses; i++) {
1150 MonoJitExceptionInfo *ei = &ji->clauses [i];
1152 if (ei->try_start <= ip && ip <= (ei->try_end)) {
1154 if (ei->flags == 0 && mono_object_isinst (obj,
1155 mono_class_get (m->klass->image, ei->token_or_filter))) {
1157 ctx->eip = (unsigned long)ei->handler_start;
1158 ctx->ecx = (unsigned long)obj;
1159 restore_context (ctx);
1160 g_assert_not_reached ();
1165 /* no handler found - we need to call all finally handlers */
1166 for (i = 0; i < ji->num_clauses; i++) {
1167 MonoJitExceptionInfo *ei = &ji->clauses [i];
1169 if (ei->try_start <= ip && ip < (ei->try_end) &&
1170 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1171 call_finally (ctx, (unsigned long)ei->handler_start);
1176 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1177 char *strace = mono_string_to_utf8 (((MonoException*)obj)->stack_trace);
1180 if (!strcmp (strace, "TODO: implement stack traces")){
1182 strace = g_strdup ("");
1185 tmp = g_strdup_printf ("%sin %s.%s:%s ()\n", strace, m->klass->name_space,
1186 m->klass->name, m->name);
1190 ((MonoException*)obj)->stack_trace = mono_string_new (domain, tmp);
1194 /* continue unwinding */
1196 /* restore caller saved registers */
1197 if (ji->used_regs & X86_ESI_MASK) {
1198 ctx->esi = *((int *)ctx->ebp + offset);
1201 if (ji->used_regs & X86_EDI_MASK) {
1202 ctx->edi = *((int *)ctx->ebp + offset);
1205 if (ji->used_regs & X86_EBX_MASK) {
1206 ctx->ebx = *((int *)ctx->ebp + offset);
1209 ctx->esp = ctx->ebp;
1210 ctx->eip = *((int *)ctx->ebp + 1);
1211 ctx->ebp = *((int *)ctx->ebp);
1213 if (next_bp < (unsigned)mono_end_of_stack)
1214 arch_handle_exception (ctx, obj);
1216 mono_jit_abort (obj);
1219 gpointer *lmf_addr = TlsGetValue (lmf_thread_id);
1223 g_assert (lmf_addr);
1224 lmf = *((MonoLMF **)lmf_addr);
1227 mono_jit_abort (obj);
1231 *lmf_addr = lmf->previous_lmf;
1233 ctx->esi = lmf->esi;
1234 ctx->edi = lmf->edi;
1235 ctx->ebx = lmf->ebx;
1236 ctx->ebp = lmf->ebp;
1237 ctx->eip = lmf->eip;
1238 ctx->esp = (unsigned long)lmf;
1240 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1241 char *strace = mono_string_to_utf8 (((MonoException*)obj)->stack_trace);
1244 if (!strcmp (strace, "TODO: implement stack traces"))
1245 strace = g_strdup ("");
1247 tmp = g_strdup_printf ("%sin (unmanaged) %s.%s:%s ()\n", strace, m->klass->name_space,
1248 m->klass->name, m->name);
1252 ((MonoException*)obj)->stack_trace = mono_string_new (domain, tmp);
1256 if (ctx->eip < (unsigned)mono_end_of_stack)
1257 arch_handle_exception (ctx, obj);
1259 mono_jit_abort (obj);
1262 g_assert_not_reached ();
1266 throw_exception (unsigned long eax, unsigned long ecx, unsigned long edx, unsigned long ebx,
1267 unsigned long esi, unsigned long edi, unsigned long ebp, MonoObject *exc,
1268 unsigned long eip, unsigned long esp)
1270 struct sigcontext ctx;
1282 arch_handle_exception (&ctx, exc);
1284 g_assert_not_reached ();
1288 * arch_get_throw_exception:
1290 * Returns a function pointer which can be used to raise
1291 * exceptions. The returned function has the following
1292 * signature: void (*func) (MonoException *exc);
1293 * For example to raise an arithmetic exception you can use:
1295 * x86_push_imm (code, mono_get_exception_arithmetic ());
1296 * x86_call_code (code, arch_get_throw_exception ());
1300 arch_get_throw_exception (void)
1302 static guint8 start [24];
1303 static int inited = 0;
1312 x86_push_reg (code, X86_ESP);
1313 x86_push_membase (code, X86_ESP, 4); /* IP */
1314 x86_push_membase (code, X86_ESP, 12); /* exception */
1315 x86_push_reg (code, X86_EBP);
1316 x86_push_reg (code, X86_EDI);
1317 x86_push_reg (code, X86_ESI);
1318 x86_push_reg (code, X86_EBX);
1319 x86_push_reg (code, X86_EDX);
1320 x86_push_reg (code, X86_ECX);
1321 x86_push_reg (code, X86_EAX);
1322 x86_call_code (code, throw_exception);
1323 /* we should never reach this breakpoint */
1324 x86_breakpoint (code);
1326 g_assert ((code - start) < 24);
1331 * arch_get_throw_exception_by_name:
1333 * Returns a function pointer which can be used to raise
1334 * corlib exceptions. The returned function has the following
1335 * signature: void (*func) (char *exc_name);
1336 * For example to raise an arithmetic exception you can use:
1338 * x86_push_imm (code, "ArithmeticException");
1339 * x86_call_code (code, arch_get_throw_exception ());
1343 arch_get_throw_exception_by_name ()
1345 static guint8 start [32];
1346 static int inited = 0;
1355 /* fixme: we do not save EAX, EDX, ECD - unsure if we need that */
1357 x86_push_membase (code, X86_ESP, 4); /* exception name */
1358 x86_push_imm (code, "System");
1359 x86_push_imm (code, mono_defaults.exception_class->image);
1360 x86_call_code (code, mono_exception_from_name);
1361 x86_alu_reg_imm (code, X86_ADD, X86_ESP, 12);
1362 /* save the newly create object (overwrite exception name)*/
1363 x86_mov_membase_reg (code, X86_ESP, 4, X86_EAX, 4);
1364 x86_jump_code (code, arch_get_throw_exception ());
1366 g_assert ((code - start) < 32);