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));
370 g_assert_not_reached ();
394 g_assert_not_reached ();
399 if (m->klass->valuetype) {
400 return *((gpointer *)o) = get_unbox_trampoline (m);
402 return *((gpointer *)o) = arch_compile_method (m);
406 * arch_create_jit_trampoline:
407 * @method: pointer to the method info
409 * Creates a trampoline function for virtual methods. If the created
410 * code is called it first starts JIT compilation of method,
411 * and then calls the newly created method. I also replaces the
412 * corresponding vtable entry (see x86_magic_trampoline).
414 * Returns: a pointer to the newly created code
417 arch_create_jit_trampoline (MonoMethod *method)
420 static guint8 *vc = NULL;
426 vc = buf = g_malloc (24);
428 /* push the return address onto the stack */
429 x86_push_membase (buf, X86_ESP, 4);
431 /* save all register values */
432 x86_push_reg (buf, X86_EBX);
433 x86_push_reg (buf, X86_EDI);
434 x86_push_reg (buf, X86_ESI);
435 x86_push_reg (buf, X86_EDX);
436 x86_push_reg (buf, X86_ECX);
437 x86_push_reg (buf, X86_EAX);
439 x86_call_code (buf, x86_magic_trampoline);
440 x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 8*4);
442 /* call the compiled method */
443 x86_jump_reg (buf, X86_EAX);
445 g_assert ((buf - vc) <= 24);
448 code = buf = g_malloc (16);
449 x86_push_imm (buf, method);
450 x86_jump_code (buf, vc);
451 g_assert ((buf - code) <= 16);
457 * arch_create_simple_jit_trampoline:
458 * @method: pointer to the method info
460 * Creates a trampoline function for method. If the created
461 * code is called it first starts JIT compilation of method,
462 * and then calls the newly created method. I also replaces the
463 * address in method->addr with the result of the JIT
464 * compilation step (in arch_compile_method).
466 * Returns: a pointer to the newly created code
469 arch_create_simple_jit_trampoline (MonoMethod *method)
476 /* we never free the allocated code buffer */
477 code = buf = g_malloc (16);
478 x86_push_imm (buf, method);
479 x86_call_code (buf, arch_compile_method);
480 x86_alu_reg_imm (buf, X86_ADD, X86_ESP, 4);
481 /* jump to the compiled method */
482 x86_jump_reg (buf, X86_EAX);
483 g_assert ((buf - code) < 16);
489 mono_label_cfg (MonoFlowGraph *cfg)
493 for (i = 0; i < cfg->block_count; i++) {
494 GPtrArray *forest = cfg->bblocks [i].forest;
497 if (!cfg->bblocks [i].reached) /* unreachable code */
502 for (j = 0; j < top; j++) {
503 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
506 mbstate = mono_burg_label (t1, cfg);
509 if (mono_debug_handle)
511 g_warning ("tree does not match");
512 mono_print_ctree (t1); printf ("\n\n");
514 mono_print_forest (forest);
515 g_assert_not_reached ();
522 tree_preallocate_regs (MBTree *tree, int goal, MonoRegSet *rs)
525 case MB_TERM_CALL_I4:
526 case MB_TERM_CALL_I8:
527 case MB_TERM_CALL_R8:
528 // case MB_TERM_CALL_VOID :
529 tree->reg1 = mono_regset_alloc_reg (rs, X86_EAX, tree->exclude_mask);
530 tree->reg2 = mono_regset_alloc_reg (rs, X86_EDX, tree->exclude_mask);
531 tree->reg3 = mono_regset_alloc_reg (rs, X86_ECX, tree->exclude_mask);
538 case MB_NTERM_lreg: {
543 tree->exclude_mask |= (1 << X86_ECX);
544 tree->left->exclude_mask |= (1 << X86_ECX);
547 case MB_TERM_MUL_OVF:
548 case MB_TERM_MUL_OVF_UN:
553 tree->reg1 = mono_regset_alloc_reg (rs, X86_EAX, tree->exclude_mask);
554 tree->reg2 = mono_regset_alloc_reg (rs, X86_EDX, tree->exclude_mask);
555 if (goal == MB_NTERM_reg) {
556 tree->left->exclude_mask |= (1 << X86_EDX);
557 tree->right->exclude_mask |= (1 << X86_EDX) | (1 << X86_EAX);
571 tree_allocate_regs (MBTree *tree, int goal, MonoRegSet *rs)
574 int ern = mono_burg_rule (tree->state, goal);
575 const guint16 *nts = mono_burg_nts [ern];
578 mono_burg_kids (tree, ern, kids);
580 //printf ("RALLOC START %d %p %d\n", tree->op, rs->free_mask, goal);
582 if (nts [0] && kids [0] == tree) {
584 tree_allocate_regs (kids [0], nts [0], rs);
588 for (i = 0; nts [i]; i++)
589 tree_preallocate_regs (kids [i], nts [i], rs);
591 for (i = 0; nts [i]; i++)
592 tree_allocate_regs (kids [i], nts [i], rs);
594 for (i = 0; nts [i]; i++) {
595 mono_regset_free_reg (rs, kids [i]->reg1);
596 mono_regset_free_reg (rs, kids [i]->reg2);
597 mono_regset_free_reg (rs, kids [i]->reg3);
602 if (tree->reg1 < 0) {
603 tree->reg1 = mono_regset_alloc_reg (rs, -1, tree->exclude_mask);
604 g_assert (tree->reg1 != -1);
609 if (tree->reg1 < 0) {
610 tree->reg1 = mono_regset_alloc_reg (rs, -1, tree->exclude_mask);
611 g_assert (tree->reg1 != -1);
613 if (tree->reg2 < 0) {
614 tree->reg2 = mono_regset_alloc_reg (rs, -1, tree->exclude_mask);
615 g_assert (tree->reg2 != -1);
620 /* fixme: allocate floating point registers */
624 if (tree->op == MB_TERM_ADD) {
625 tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, tree->exclude_mask);
626 tree->reg2 = mono_regset_alloc_reg (rs, tree->right->reg1, tree->exclude_mask);
631 if (tree->op == MB_TERM_ADD) {
632 tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, tree->exclude_mask);
637 if (tree->op == MB_TERM_SHL ||
638 tree->op == MB_TERM_MUL) {
639 tree->reg1 = mono_regset_alloc_reg (rs, tree->left->reg1, tree->exclude_mask);
647 //printf ("RALLOC END %d %p\n", tree->op, rs->free_mask);
648 tree->emit = mono_burg_func [ern];
652 arch_allocate_regs (MonoFlowGraph *cfg)
656 for (i = 0; i < cfg->block_count; i++) {
657 GPtrArray *forest = cfg->bblocks [i].forest;
660 if (!cfg->bblocks [i].reached) /* unreachable code */
665 for (j = 0; j < top; j++) {
666 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
667 //printf ("AREGSTART %d:%d %p\n", i, j, cfg->rs->free_mask);
668 tree_allocate_regs (t1, 1, cfg->rs);
669 //printf ("AREGENDT %d:%d %p\n", i, j, cfg->rs->free_mask);
670 g_assert (cfg->rs->free_mask == 0xffffffff);
676 tree_emit (int goal, MonoFlowGraph *cfg, MBTree *tree)
679 int i, ern = mono_burg_rule (tree->state, goal);
680 const guint16 *nts = mono_burg_nts [ern];
684 mono_burg_kids (tree, ern, kids);
686 for (i = 0; nts [i]; i++)
687 tree_emit (nts [i], cfg, kids [i]);
689 tree->addr = offset = cfg->code - cfg->start;
691 // we assume an instruction uses a maximum of 128 bytes
692 if ((cfg->code_size - offset) <= 128) {
693 int add = MIN ((cfg->code_size * 2), 1024);
695 cfg->code_size += add;
696 cfg->start = g_realloc (cfg->start, cfg->code_size);
697 g_assert (cfg->start);
698 cfg->code = cfg->start + offset;
701 if ((emit = mono_burg_func [ern]))
704 g_assert ((cfg->code - cfg->start) < cfg->code_size);
708 mono_emit_cfg (MonoFlowGraph *cfg)
712 for (i = 0; i < cfg->block_count; i++) {
713 MonoBBlock *bb = &cfg->bblocks [i];
714 GPtrArray *forest = bb->forest;
717 if (!bb->reached) /* unreachable code */
722 bb->addr = cfg->code - cfg->start;
724 for (j = 0; j < top; j++) {
725 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, j);
727 tree_emit (1, cfg, t1);
731 cfg->epilog = cfg->code - cfg->start;
735 mono_compute_branches (MonoFlowGraph *cfg)
742 for (j = 0; j < cfg->block_count; j++) {
743 MonoBBlock *bb = &cfg->bblocks [j];
744 GPtrArray *forest = bb->forest;
747 if (!bb->reached) /* unreachable code */
752 for (i = 0; i < top; i++) {
753 MBTree *t1 = (MBTree *) g_ptr_array_index (forest, i);
757 if (t1->op == MB_TERM_SWITCH) {
758 MonoBBlock **jt = (MonoBBlock **)t1->data.p;
759 guint32 *rt = (guint32 *)t1->data.p;
761 int m = *((guint32 *)t1->data.p) + 1;
764 for (j = 1; j <= m; j++)
765 rt [j] = (int)(jt [j]->addr + cfg->start);
768 /* emit the jump instruction again to update addresses */
769 cfg->code = cfg->start + t1->addr;
770 ((MBEmitFunc)t1->emit) (t1, cfg);
780 match_debug_method (MonoMethod* method)
782 GList *tmp = mono_debug_methods;
784 for (; tmp; tmp = tmp->next) {
785 if (strcmp (method->name, tmp->data) == 0) {
793 * arch_compile_method:
794 * @method: pointer to the method info
796 * JIT compilation of a single method. This method also writes the result
797 * back to method->addr, an thus overwrites the trampoline function.
799 * Returns: a pointer to the newly created code.
802 arch_compile_method (MonoMethod *method)
805 MonoMemPool *mp = mono_mempool_new ();
807 g_assert (!(method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL));
808 g_assert (!(method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL));
810 if (mono_jit_trace_calls || mono_jit_dump_asm || mono_jit_dump_forest) {
811 printf ("Start JIT compilation of %s.%s:%s\n", method->klass->name_space,
812 method->klass->name, method->name);
815 if (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) {
816 MonoClassField *field;
817 const char *name = method->name;
818 static guint target_offset = 0;
819 static guint method_offset = 0;
821 gboolean delegate = FALSE;
823 if (method->klass->parent &&
824 method->klass->parent->parent == mono_defaults.delegate_class)
827 if (!target_offset) {
828 mono_class_init (mono_defaults.delegate_class);
830 field = mono_class_get_field_from_name (mono_defaults.delegate_class, "m_target");
831 target_offset = field->offset;
832 field = mono_class_get_field_from_name (mono_defaults.delegate_class, "method_ptr");
833 method_offset = field->offset;
836 if (delegate && *name == '.' && (strcmp (name, ".ctor") == 0)) {
837 method->addr = code = g_malloc (32);
838 x86_push_reg (code, X86_EBP);
839 x86_mov_reg_reg (code, X86_EBP, X86_ESP, 4);
841 /* load the this pointer */
842 x86_mov_reg_membase (code, X86_EAX, X86_EBP, 8, 4);
843 /* load m_target arg */
844 x86_mov_reg_membase (code, X86_EDX, X86_EBP, 12, 4);
846 x86_mov_membase_reg (code, X86_EAX, target_offset, X86_EDX, 4);
847 /* load method_ptr arg */
848 x86_mov_reg_membase (code, X86_EDX, X86_EBP, 16, 4);
849 /* store method_ptr */
850 x86_mov_membase_reg (code, X86_EAX, method_offset, X86_EDX, 4);
855 g_assert ((code - (guint8*)method->addr) < 32);
857 } else if (delegate && *name == 'I' && (strcmp (name, "Invoke") == 0)) {
858 MonoMethodSignature *csig = method->signature;
859 int i, arg_size, target, this_pos = 4;
862 if (csig->ret->type == MONO_TYPE_VALUETYPE) {
863 g_assert (!csig->ret->byref);
868 if (csig->param_count) {
871 for (i = 0; i < csig->param_count; ++i) {
872 arg_size += mono_type_stack_size (csig->params [i], &align);
873 g_assert (align == 4);
877 method->addr = g_malloc (64 + arg_size);
879 for (i = 0; i < 2; i ++) {
883 /* load the this pointer */
884 x86_mov_reg_membase (code, X86_EAX, X86_ESP, this_pos, 4);
886 x86_mov_reg_membase (code, X86_EDX, X86_EAX, target_offset, 4);
887 /* check if zero (static method call without this pointer) */
888 x86_alu_reg_imm (code, X86_CMP, X86_EDX, 0);
889 x86_branch32 (code, X86_CC_EQ, target, TRUE);
892 /* virtual delegate methods: we have to replace the this pointer
893 * withe the actual target */
894 x86_mov_membase_reg (code, X86_ESP, this_pos, X86_EDX, 4);
895 /* jump to method_ptr() */
896 x86_jump_membase (code, X86_EAX, method_offset);
898 /* static delegate methods: we have to remove the this pointer
899 * from the activation frame - I do this do creating a new
900 * stack frame an copy all arguments except the this pointer */
902 target = code - source;
903 g_assert ((arg_size & 3) == 0);
904 for (j = 0; j < (arg_size>>2); j++) {
905 x86_push_membase (code, X86_ESP, (arg_size + this_pos));
909 x86_push_membase (code, X86_ESP, (arg_size + 4));
911 x86_call_membase (code, X86_EAX, method_offset);
913 x86_alu_reg_imm (code, X86_ADD, X86_ESP, arg_size + 4);
915 x86_alu_reg_imm (code, X86_ADD, X86_ESP, arg_size);
921 g_assert ((code - (guint8*)method->addr) < (64 + arg_size));
924 if (mono_debug_handle)
926 g_error ("Don't know how to exec runtime method %s.%s::%s",
927 method->klass->name_space, method->klass->name, method->name);
931 MonoMethodHeader *header = ((MonoMethodNormal *)method)->header;
932 MonoJitInfo *ji = g_new0 (MonoJitInfo, 1);
934 cfg = mono_cfg_new (method, mp);
936 mono_analyze_flow (cfg);
940 mono_analyze_stack (cfg);
944 cfg->rs = mono_regset_new (X86_NREG);
945 mono_regset_reserve_reg (cfg->rs, X86_ESP);
946 mono_regset_reserve_reg (cfg->rs, X86_EBP);
948 cfg->code_size = 256;
949 cfg->start = cfg->code = g_malloc (cfg->code_size);
951 if (match_debug_method (method))
952 x86_breakpoint (cfg->code);
954 if (mono_jit_dump_forest) {
956 printf ("FOREST %s.%s:%s\n", method->klass->name_space,
957 method->klass->name, method->name);
958 for (i = 0; i < cfg->block_count; i++) {
959 printf ("BLOCK %d:\n", i);
960 mono_print_forest (cfg->bblocks [i].forest);
964 mono_label_cfg (cfg);
968 arch_allocate_regs (cfg);
970 /* align to 8 byte boundary */
971 cfg->locals_size += 7;
972 cfg->locals_size &= ~7;
974 arch_emit_prologue (cfg);
976 arch_emit_epilogue (cfg);
978 method->addr = cfg->start;
980 mono_compute_branches (cfg);
982 if (mono_jit_dump_asm) {
983 char *id = g_strdup_printf ("%s.%s_%s", method->klass->name_space,
984 method->klass->name, method->name);
985 mono_disassemble_code (cfg->start, cfg->code - cfg->start, id);
988 if (mono_debug_handle)
989 mono_debug_add_method (mono_debug_handle, cfg);
991 ji->code_size = cfg->code - cfg->start;
992 ji->used_regs = cfg->rs->used_mask;
994 ji->code_start = method->addr;
995 mono_jit_info_table_add (mono_jit_info_table, ji);
997 if (header->num_clauses) {
998 int i, start_block, end_block;
1000 ji->num_clauses = header->num_clauses;
1001 ji->clauses = g_new0 (MonoJitExceptionInfo, header->num_clauses);
1003 for (i = 0; i < header->num_clauses; i++) {
1004 MonoExceptionClause *ec = &header->clauses [i];
1005 MonoJitExceptionInfo *ei = &ji->clauses [i];
1007 ei->flags = ec->flags;
1008 ei->token_or_filter = ec->token_or_filter;
1010 g_assert (cfg->bcinfo [ec->try_offset].is_block_start);
1011 start_block = cfg->bcinfo [ec->try_offset].block_id;
1012 end_block = cfg->bcinfo [ec->try_offset + ec->try_len].block_id;
1013 g_assert (cfg->bcinfo [ec->try_offset + ec->try_len].is_block_start);
1015 ei->try_start = cfg->start + cfg->bblocks [start_block].addr;
1016 ei->try_end = cfg->start + cfg->bblocks [end_block].addr;
1018 g_assert (cfg->bcinfo [ec->handler_offset].is_block_start);
1019 start_block = cfg->bcinfo [ec->handler_offset].block_id;
1020 ei->handler_start = cfg->start + cfg->bblocks [start_block].addr;
1022 //printf ("TEST %x %x %x\n", ei->try_start, ei->try_end, ei->handler_start);
1026 mono_regset_free (cfg->rs);
1028 mono_cfg_free (cfg);
1030 mono_mempool_destroy (mp);
1034 if (mono_jit_trace_calls || mono_jit_dump_asm || mono_jit_dump_forest) {
1035 printf ("END JIT compilation of %s.%s:%s %p %p\n", method->klass->name_space,
1036 method->klass->name, method->name, method, method->addr);
1040 return method->addr;
1044 * arch_get_restore_context:
1046 * Returns a pointer to a method which restores a previously saved sigcontext.
1049 arch_get_restore_context ()
1051 static guint8 *start = NULL;
1057 /* restore_contect (struct sigcontext *ctx) */
1058 /* we do not restore X86_EAX, X86_EDX */
1060 start = code = malloc (1024);
1063 x86_mov_reg_membase (code, X86_EAX, X86_ESP, 4, 4);
1065 /* get return address, stored in EDX */
1066 x86_mov_reg_membase (code, X86_EDX, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, eip), 4);
1069 x86_mov_reg_membase (code, X86_EBX, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ebx), 4);
1071 x86_mov_reg_membase (code, X86_EDI, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, edi), 4);
1073 x86_mov_reg_membase (code, X86_ESI, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, esi), 4);
1075 x86_mov_reg_membase (code, X86_ESP, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, esp), 4);
1077 x86_mov_reg_membase (code, X86_EBP, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ebp), 4);
1078 /* restore ECX. the exception object is passed here to the catch handler */
1079 x86_mov_reg_membase (code, X86_ECX, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ecx), 4);
1081 /* jump to the saved IP */
1082 x86_jump_reg (code, X86_EDX);
1088 * arch_get_call_finally:
1090 * Returns a pointer to a method which calls a finally handler.
1093 arch_get_call_finally ()
1095 static guint8 start [28];
1096 static int inited = 0;
1103 /* call_finally (struct sigcontext *ctx, unsigned long eip) */
1106 x86_push_reg (code, X86_EBP);
1107 x86_mov_reg_reg (code, X86_EBP, X86_ESP, 4);
1108 x86_push_reg (code, X86_EBX);
1109 x86_push_reg (code, X86_EDI);
1110 x86_push_reg (code, X86_ESI);
1113 x86_mov_reg_membase (code, X86_EAX, X86_EBP, 8, 4);
1115 x86_mov_reg_membase (code, X86_ECX, X86_EBP, 12, 4);
1117 x86_push_reg (code, X86_EBP);
1119 x86_mov_reg_membase (code, X86_EBP, X86_EAX, G_STRUCT_OFFSET (struct sigcontext, ebp), 4);
1120 /* call the handler */
1121 x86_call_reg (code, X86_ECX);
1123 x86_pop_reg (code, X86_EBP);
1124 /* restore saved regs */
1125 x86_pop_reg (code, X86_ESI);
1126 x86_pop_reg (code, X86_EDI);
1127 x86_pop_reg (code, X86_EBX);
1131 g_assert ((code - start) < 28);
1136 * arch_handle_exception:
1137 * @ctx: saved processor state
1141 arch_handle_exception (struct sigcontext *ctx, gpointer obj)
1143 MonoDomain *domain = mono_domain_get ();
1145 gpointer ip = (gpointer)ctx->eip;
1146 static void (*restore_context) (struct sigcontext *);
1147 static void (*call_finally) (struct sigcontext *, unsigned long);
1149 g_assert (ctx != NULL);
1150 g_assert (obj != NULL);
1152 ji = mono_jit_info_table_find (mono_jit_info_table, ip);
1154 if (!restore_context)
1155 restore_context = arch_get_restore_context ();
1158 call_finally = arch_get_call_finally ();
1160 if (ji) { /* we are inside managed code */
1161 MonoMethod *m = ji->method;
1165 if (ji->num_clauses) {
1168 g_assert (ji->clauses);
1170 for (i = 0; i < ji->num_clauses; i++) {
1171 MonoJitExceptionInfo *ei = &ji->clauses [i];
1173 if (ei->try_start <= ip && ip <= (ei->try_end)) {
1175 if (ei->flags == 0 && mono_object_isinst (obj,
1176 mono_class_get (m->klass->image, ei->token_or_filter))) {
1178 ctx->eip = (unsigned long)ei->handler_start;
1179 ctx->ecx = (unsigned long)obj;
1180 restore_context (ctx);
1181 g_assert_not_reached ();
1186 /* no handler found - we need to call all finally handlers */
1187 for (i = 0; i < ji->num_clauses; i++) {
1188 MonoJitExceptionInfo *ei = &ji->clauses [i];
1190 if (ei->try_start <= ip && ip < (ei->try_end) &&
1191 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1192 call_finally (ctx, (unsigned long)ei->handler_start);
1197 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1198 char *strace = mono_string_to_utf8 (((MonoException*)obj)->stack_trace);
1201 if (!strcmp (strace, "TODO: implement stack traces")){
1203 strace = g_strdup ("");
1206 tmp = g_strdup_printf ("%sin %s.%s:%s ()\n", strace, m->klass->name_space,
1207 m->klass->name, m->name);
1211 ((MonoException*)obj)->stack_trace = mono_string_new (domain, tmp);
1215 /* continue unwinding */
1217 /* restore caller saved registers */
1218 if (ji->used_regs & X86_ESI_MASK) {
1219 ctx->esi = *((int *)ctx->ebp + offset);
1222 if (ji->used_regs & X86_EDI_MASK) {
1223 ctx->edi = *((int *)ctx->ebp + offset);
1226 if (ji->used_regs & X86_EBX_MASK) {
1227 ctx->ebx = *((int *)ctx->ebp + offset);
1230 ctx->esp = ctx->ebp;
1231 ctx->eip = *((int *)ctx->ebp + 1);
1232 ctx->ebp = *((int *)ctx->ebp);
1234 if (next_bp < (unsigned)mono_end_of_stack)
1235 arch_handle_exception (ctx, obj);
1237 mono_jit_abort (obj);
1240 gpointer *lmf_addr = TlsGetValue (lmf_thread_id);
1244 g_assert (lmf_addr);
1245 lmf = *((MonoLMF **)lmf_addr);
1248 mono_jit_abort (obj);
1252 *lmf_addr = lmf->previous_lmf;
1254 ctx->esi = lmf->esi;
1255 ctx->edi = lmf->edi;
1256 ctx->ebx = lmf->ebx;
1257 ctx->ebp = lmf->ebp;
1258 ctx->eip = lmf->eip;
1259 ctx->esp = (unsigned long)lmf;
1261 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1262 char *strace = mono_string_to_utf8 (((MonoException*)obj)->stack_trace);
1265 if (!strcmp (strace, "TODO: implement stack traces"))
1266 strace = g_strdup ("");
1268 tmp = g_strdup_printf ("%sin (unmanaged) %s.%s:%s ()\n", strace, m->klass->name_space,
1269 m->klass->name, m->name);
1273 ((MonoException*)obj)->stack_trace = mono_string_new (domain, tmp);
1277 if (ctx->eip < (unsigned)mono_end_of_stack)
1278 arch_handle_exception (ctx, obj);
1280 mono_jit_abort (obj);
1283 g_assert_not_reached ();
1287 throw_exception (unsigned long eax, unsigned long ecx, unsigned long edx, unsigned long ebx,
1288 unsigned long esi, unsigned long edi, unsigned long ebp, MonoObject *exc,
1289 unsigned long eip, unsigned long esp)
1291 struct sigcontext ctx;
1303 arch_handle_exception (&ctx, exc);
1305 g_assert_not_reached ();
1309 arch_get_throw_exception (void)
1311 static guint8 start [24];
1312 static int inited = 0;
1321 x86_push_reg (code, X86_ESP);
1322 x86_push_membase (code, X86_ESP, 4); /* IP */
1323 x86_push_membase (code, X86_ESP, 12); /* exception */
1324 x86_push_reg (code, X86_EBP);
1325 x86_push_reg (code, X86_EDI);
1326 x86_push_reg (code, X86_ESI);
1327 x86_push_reg (code, X86_EBX);
1328 x86_push_reg (code, X86_EDX);
1329 x86_push_reg (code, X86_ECX);
1330 x86_push_reg (code, X86_EAX);
1331 x86_call_code (code, throw_exception);
1332 /* we should never reach this breakpoint */
1333 x86_breakpoint (code);
1335 g_assert ((code - start) < 24);