1 // Copyright 2012 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
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28 #ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_
29 #define V8_IA32_MACRO_ASSEMBLER_IA32_H_
31 #include "assembler.h"
33 #include "v8globals.h"
38 // Convenience for platform-independent signatures. We do not normally
39 // distinguish memory operands from other operands on ia32.
40 typedef Operand MemOperand;
42 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
43 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
46 enum RegisterValueType {
47 REGISTER_VALUE_IS_SMI,
48 REGISTER_VALUE_IS_INT32
52 bool AreAliased(Register r1, Register r2, Register r3, Register r4);
55 // MacroAssembler implements a collection of frequently used macros.
56 class MacroAssembler: public Assembler {
58 // The isolate parameter can be NULL if the macro assembler should
59 // not use isolate-dependent functionality. In this case, it's the
60 // responsibility of the caller to never invoke such function on the
62 MacroAssembler(Isolate* isolate, void* buffer, int size);
64 // ---------------------------------------------------------------------------
66 enum RememberedSetFinalAction {
71 // Record in the remembered set the fact that we have a pointer to new space
72 // at the address pointed to by the addr register. Only works if addr is not
74 void RememberedSetHelper(Register object, // Used for debug code.
77 SaveFPRegsMode save_fp,
78 RememberedSetFinalAction and_then);
80 void CheckPageFlag(Register object,
85 Label::Distance condition_met_distance = Label::kFar);
87 void CheckPageFlagForMap(
92 Label::Distance condition_met_distance = Label::kFar);
94 void CheckMapDeprecated(Handle<Map> map,
96 Label* if_deprecated);
98 // Check if object is in new space. Jumps if the object is not in new space.
99 // The register scratch can be object itself, but scratch will be clobbered.
100 void JumpIfNotInNewSpace(Register object,
103 Label::Distance distance = Label::kFar) {
104 InNewSpace(object, scratch, zero, branch, distance);
107 // Check if object is in new space. Jumps if the object is in new space.
108 // The register scratch can be object itself, but it will be clobbered.
109 void JumpIfInNewSpace(Register object,
112 Label::Distance distance = Label::kFar) {
113 InNewSpace(object, scratch, not_zero, branch, distance);
116 // Check if an object has a given incremental marking color. Also uses ecx!
117 void HasColor(Register object,
121 Label::Distance has_color_distance,
125 void JumpIfBlack(Register object,
129 Label::Distance on_black_distance = Label::kFar);
131 // Checks the color of an object. If the object is already grey or black
132 // then we just fall through, since it is already live. If it is white and
133 // we can determine that it doesn't need to be scanned, then we just mark it
134 // black and fall through. For the rest we jump to the label so the
135 // incremental marker can fix its assumptions.
136 void EnsureNotWhite(Register object,
139 Label* object_is_white_and_not_data,
140 Label::Distance distance);
142 // Notify the garbage collector that we wrote a pointer into an object.
143 // |object| is the object being stored into, |value| is the object being
144 // stored. value and scratch registers are clobbered by the operation.
145 // The offset is the offset from the start of the object, not the offset from
146 // the tagged HeapObject pointer. For use with FieldOperand(reg, off).
147 void RecordWriteField(
152 SaveFPRegsMode save_fp,
153 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
154 SmiCheck smi_check = INLINE_SMI_CHECK);
156 // As above, but the offset has the tag presubtracted. For use with
157 // Operand(reg, off).
158 void RecordWriteContextSlot(
163 SaveFPRegsMode save_fp,
164 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
165 SmiCheck smi_check = INLINE_SMI_CHECK) {
166 RecordWriteField(context,
167 offset + kHeapObjectTag,
171 remembered_set_action,
175 // Notify the garbage collector that we wrote a pointer into a fixed array.
176 // |array| is the array being stored into, |value| is the
177 // object being stored. |index| is the array index represented as a
178 // Smi. All registers are clobbered by the operation RecordWriteArray
179 // filters out smis so it does not update the write barrier if the
181 void RecordWriteArray(
185 SaveFPRegsMode save_fp,
186 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
187 SmiCheck smi_check = INLINE_SMI_CHECK);
189 // For page containing |object| mark region covering |address|
190 // dirty. |object| is the object being stored into, |value| is the
191 // object being stored. The address and value registers are clobbered by the
192 // operation. RecordWrite filters out smis so it does not update the
193 // write barrier if the value is a smi.
198 SaveFPRegsMode save_fp,
199 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
200 SmiCheck smi_check = INLINE_SMI_CHECK);
202 // For page containing |object| mark the region covering the object's map
203 // dirty. |object| is the object being stored into, |map| is the Map object
205 void RecordWriteForMap(
210 SaveFPRegsMode save_fp);
212 #ifdef ENABLE_DEBUGGER_SUPPORT
213 // ---------------------------------------------------------------------------
219 // Enter specific kind of exit frame. Expects the number of
220 // arguments in register eax and sets up the number of arguments in
221 // register edi and the pointer to the first argument in register
223 void EnterExitFrame(bool save_doubles);
225 void EnterApiExitFrame(int argc);
227 // Leave the current exit frame. Expects the return value in
228 // register eax:edx (untouched) and the pointer to the first
229 // argument in register esi.
230 void LeaveExitFrame(bool save_doubles);
232 // Leave the current exit frame. Expects the return value in
233 // register eax (untouched).
234 void LeaveApiExitFrame();
236 // Find the function context up the context chain.
237 void LoadContext(Register dst, int context_chain_length);
239 // Conditionally load the cached Array transitioned map of type
240 // transitioned_kind from the native context if the map in register
241 // map_in_out is the cached Array map in the native context of
243 void LoadTransitionedArrayMapConditional(
244 ElementsKind expected_kind,
245 ElementsKind transitioned_kind,
248 Label* no_map_match);
250 // Load the initial map for new Arrays from a JSFunction.
251 void LoadInitialArrayMap(Register function_in,
254 bool can_have_holes);
256 void LoadGlobalContext(Register global_context);
258 // Load the global function with the given index.
259 void LoadGlobalFunction(int index, Register function);
261 // Load the initial map from the global function. The registers
262 // function and map can be the same.
263 void LoadGlobalFunctionInitialMap(Register function, Register map);
265 // Push and pop the registers that can hold pointers.
266 void PushSafepointRegisters() { pushad(); }
267 void PopSafepointRegisters() { popad(); }
268 // Store the value in register/immediate src in the safepoint
269 // register stack slot for register dst.
270 void StoreToSafepointRegisterSlot(Register dst, Register src);
271 void StoreToSafepointRegisterSlot(Register dst, Immediate src);
272 void LoadFromSafepointRegisterSlot(Register dst, Register src);
274 void LoadHeapObject(Register result, Handle<HeapObject> object);
275 void PushHeapObject(Handle<HeapObject> object);
277 void LoadObject(Register result, Handle<Object> object) {
278 ALLOW_HANDLE_DEREF(isolate(), "heap object check");
279 if (object->IsHeapObject()) {
280 LoadHeapObject(result, Handle<HeapObject>::cast(object));
282 Set(result, Immediate(object));
286 // ---------------------------------------------------------------------------
287 // JavaScript invokes
289 // Set up call kind marking in ecx. The method takes ecx as an
290 // explicit first parameter to make the code more readable at the
292 void SetCallKind(Register dst, CallKind kind);
294 // Invoke the JavaScript function code by either calling or jumping.
295 void InvokeCode(Register code,
296 const ParameterCount& expected,
297 const ParameterCount& actual,
299 const CallWrapper& call_wrapper,
300 CallKind call_kind) {
301 InvokeCode(Operand(code), expected, actual, flag, call_wrapper, call_kind);
304 void InvokeCode(const Operand& code,
305 const ParameterCount& expected,
306 const ParameterCount& actual,
308 const CallWrapper& call_wrapper,
311 void InvokeCode(Handle<Code> code,
312 const ParameterCount& expected,
313 const ParameterCount& actual,
314 RelocInfo::Mode rmode,
316 const CallWrapper& call_wrapper,
319 // Invoke the JavaScript function in the given register. Changes the
320 // current context to the context in the function before invoking.
321 void InvokeFunction(Register function,
322 const ParameterCount& actual,
324 const CallWrapper& call_wrapper,
327 void InvokeFunction(Handle<JSFunction> function,
328 const ParameterCount& expected,
329 const ParameterCount& actual,
331 const CallWrapper& call_wrapper,
334 // Invoke specified builtin JavaScript function. Adds an entry to
335 // the unresolved list if the name does not resolve.
336 void InvokeBuiltin(Builtins::JavaScript id,
338 const CallWrapper& call_wrapper = NullCallWrapper());
340 // Store the function for the given builtin in the target register.
341 void GetBuiltinFunction(Register target, Builtins::JavaScript id);
343 // Store the code object for the given builtin in the target register.
344 void GetBuiltinEntry(Register target, Builtins::JavaScript id);
346 // Expression support
347 void Set(Register dst, const Immediate& x);
348 void Set(const Operand& dst, const Immediate& x);
350 // Support for constant splitting.
351 bool IsUnsafeImmediate(const Immediate& x);
352 void SafeSet(Register dst, const Immediate& x);
353 void SafePush(const Immediate& x);
355 // Compare against a known root, e.g. undefined, null, true, ...
356 void CompareRoot(Register with, Heap::RootListIndex index);
357 void CompareRoot(const Operand& with, Heap::RootListIndex index);
359 // Compare object type for heap object.
360 // Incoming register is heap_object and outgoing register is map.
361 void CmpObjectType(Register heap_object, InstanceType type, Register map);
363 // Compare instance type for map.
364 void CmpInstanceType(Register map, InstanceType type);
366 // Check if a map for a JSObject indicates that the object has fast elements.
367 // Jump to the specified label if it does not.
368 void CheckFastElements(Register map,
370 Label::Distance distance = Label::kFar);
372 // Check if a map for a JSObject indicates that the object can have both smi
373 // and HeapObject elements. Jump to the specified label if it does not.
374 void CheckFastObjectElements(Register map,
376 Label::Distance distance = Label::kFar);
378 // Check if a map for a JSObject indicates that the object has fast smi only
379 // elements. Jump to the specified label if it does not.
380 void CheckFastSmiElements(Register map,
382 Label::Distance distance = Label::kFar);
384 // Check to see if maybe_number can be stored as a double in
385 // FastDoubleElements. If it can, store it at the index specified by key in
386 // the FastDoubleElements array elements, otherwise jump to fail.
387 void StoreNumberToDoubleElements(Register maybe_number,
391 XMMRegister scratch2,
393 bool specialize_for_processor,
396 // Compare an object's map with the specified map and its transitioned
397 // elements maps if mode is ALLOW_ELEMENT_TRANSITION_MAPS. FLAGS are set with
398 // result of map compare. If multiple map compares are required, the compare
399 // sequences branches to early_success.
400 void CompareMap(Register obj,
402 Label* early_success,
403 CompareMapMode mode = REQUIRE_EXACT_MAP);
405 // Check if the map of an object is equal to a specified map and branch to
406 // label if not. Skip the smi check if not required (object is known to be a
407 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
408 // against maps that are ElementsKind transition maps of the specified map.
409 void CheckMap(Register obj,
412 SmiCheckType smi_check_type,
413 CompareMapMode mode = REQUIRE_EXACT_MAP);
415 // Check if the map of an object is equal to a specified map and branch to a
416 // specified target if equal. Skip the smi check if not required (object is
417 // known to be a heap object)
418 void DispatchMap(Register obj,
421 Handle<Code> success,
422 SmiCheckType smi_check_type);
424 // Check if the object in register heap_object is a string. Afterwards the
425 // register map contains the object map and the register instance_type
426 // contains the instance_type. The registers map and instance_type can be the
427 // same in which case it contains the instance type afterwards. Either of the
428 // registers map and instance_type can be the same as heap_object.
429 Condition IsObjectStringType(Register heap_object,
431 Register instance_type);
433 // Check if the object in register heap_object is a name. Afterwards the
434 // register map contains the object map and the register instance_type
435 // contains the instance_type. The registers map and instance_type can be the
436 // same in which case it contains the instance type afterwards. Either of the
437 // registers map and instance_type can be the same as heap_object.
438 Condition IsObjectNameType(Register heap_object,
440 Register instance_type);
442 // Check if a heap object's type is in the JSObject range, not including
443 // JSFunction. The object's map will be loaded in the map register.
444 // Any or all of the three registers may be the same.
445 // The contents of the scratch register will always be overwritten.
446 void IsObjectJSObjectType(Register heap_object,
451 // The contents of the scratch register will be overwritten.
452 void IsInstanceJSObjectType(Register map, Register scratch, Label* fail);
454 // FCmp is similar to integer cmp, but requires unsigned
455 // jcc instructions (je, ja, jae, jb, jbe, je, and jz).
458 void ClampUint8(Register reg);
460 void ClampDoubleToUint8(XMMRegister input_reg,
461 XMMRegister scratch_reg,
462 Register result_reg);
465 // Smi tagging support.
466 void SmiTag(Register reg) {
467 STATIC_ASSERT(kSmiTag == 0);
468 STATIC_ASSERT(kSmiTagSize == 1);
471 void SmiUntag(Register reg) {
472 sar(reg, kSmiTagSize);
475 // Modifies the register even if it does not contain a Smi!
476 void SmiUntag(Register reg, Label* is_smi) {
477 STATIC_ASSERT(kSmiTagSize == 1);
478 sar(reg, kSmiTagSize);
479 STATIC_ASSERT(kSmiTag == 0);
480 j(not_carry, is_smi);
483 void LoadUint32(XMMRegister dst, Register src, XMMRegister scratch);
485 // Jump the register contains a smi.
486 inline void JumpIfSmi(Register value,
488 Label::Distance distance = Label::kFar) {
489 test(value, Immediate(kSmiTagMask));
490 j(zero, smi_label, distance);
492 // Jump if the operand is a smi.
493 inline void JumpIfSmi(Operand value,
495 Label::Distance distance = Label::kFar) {
496 test(value, Immediate(kSmiTagMask));
497 j(zero, smi_label, distance);
499 // Jump if register contain a non-smi.
500 inline void JumpIfNotSmi(Register value,
501 Label* not_smi_label,
502 Label::Distance distance = Label::kFar) {
503 test(value, Immediate(kSmiTagMask));
504 j(not_zero, not_smi_label, distance);
507 void LoadInstanceDescriptors(Register map, Register descriptors);
508 void EnumLength(Register dst, Register map);
509 void NumberOfOwnDescriptors(Register dst, Register map);
511 template<typename Field>
512 void DecodeField(Register reg) {
513 static const int shift = Field::kShift;
514 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize;
516 and_(reg, Immediate(mask));
518 void LoadPowerOf2(XMMRegister dst, Register scratch, int power);
520 // Abort execution if argument is not a number, enabled via --debug-code.
521 void AssertNumber(Register object);
523 // Abort execution if argument is not a smi, enabled via --debug-code.
524 void AssertSmi(Register object);
526 // Abort execution if argument is a smi, enabled via --debug-code.
527 void AssertNotSmi(Register object);
529 // Abort execution if argument is not a string, enabled via --debug-code.
530 void AssertString(Register object);
532 // Abort execution if argument is not a name, enabled via --debug-code.
533 void AssertName(Register object);
535 // ---------------------------------------------------------------------------
536 // Exception handling
538 // Push a new try handler and link it into try handler chain.
539 void PushTryHandler(StackHandler::Kind kind, int handler_index);
541 // Unlink the stack handler on top of the stack from the try handler chain.
542 void PopTryHandler();
544 // Throw to the top handler in the try hander chain.
545 void Throw(Register value);
547 // Throw past all JS frames to the top JS entry frame.
548 void ThrowUncatchable(Register value);
550 // ---------------------------------------------------------------------------
551 // Inline caching support
553 // Generate code for checking access rights - used for security checks
554 // on access to global objects across environments. The holder register
555 // is left untouched, but the scratch register is clobbered.
556 void CheckAccessGlobalProxy(Register holder_reg,
561 void GetNumberHash(Register r0, Register scratch);
563 void LoadFromNumberDictionary(Label* miss,
572 // ---------------------------------------------------------------------------
573 // Allocation support
575 // Allocate an object in new space or old pointer space. If the given space
576 // is exhausted control continues at the gc_required label. The allocated
577 // object is returned in result and end of the new object is returned in
578 // result_end. The register scratch can be passed as no_reg in which case
579 // an additional object reference will be added to the reloc info. The
580 // returned pointers in result and result_end have not yet been tagged as
581 // heap objects. If result_contains_top_on_entry is true the content of
582 // result is known to be the allocation top on entry (could be result_end
583 // from a previous call). If result_contains_top_on_entry is true scratch
584 // should be no_reg as it is never used.
585 void Allocate(int object_size,
590 AllocationFlags flags);
592 void Allocate(int header_size,
593 ScaleFactor element_size,
594 Register element_count,
595 RegisterValueType element_count_type,
600 AllocationFlags flags);
602 void Allocate(Register object_size,
607 AllocationFlags flags);
609 // Undo allocation in new space. The object passed and objects allocated after
610 // it will no longer be allocated. Make sure that no pointers are left to the
611 // object(s) no longer allocated as they would be invalid when allocation is
613 void UndoAllocationInNewSpace(Register object);
615 // Allocate a heap number in new space with undefined value. The
616 // register scratch2 can be passed as no_reg; the others must be
617 // valid registers. Returns tagged pointer in result register, or
618 // jumps to gc_required if new space is full.
619 void AllocateHeapNumber(Register result,
624 // Allocate a sequential string. All the header fields of the string object
626 void AllocateTwoByteString(Register result,
632 void AllocateAsciiString(Register result,
638 void AllocateAsciiString(Register result,
644 // Allocate a raw cons string object. Only the map field of the result is
646 void AllocateTwoByteConsString(Register result,
650 void AllocateAsciiConsString(Register result,
655 // Allocate a raw sliced string object. Only the map field of the result is
657 void AllocateTwoByteSlicedString(Register result,
661 void AllocateAsciiSlicedString(Register result,
666 // Copy memory, byte-by-byte, from source to destination. Not optimized for
667 // long or aligned copies.
668 // The contents of index and scratch are destroyed.
669 void CopyBytes(Register source,
670 Register destination,
674 // Initialize fields with filler values. Fields starting at |start_offset|
675 // not including end_offset are overwritten with the value in |filler|. At
676 // the end the loop, |start_offset| takes the value of |end_offset|.
677 void InitializeFieldsWithFiller(Register start_offset,
681 // ---------------------------------------------------------------------------
682 // Support functions.
684 // Check a boolean-bit of a Smi field.
685 void BooleanBitTest(Register object, int field_offset, int bit_index);
687 // Check if result is zero and op is negative.
688 void NegativeZeroTest(Register result, Register op, Label* then_label);
690 // Check if result is zero and any of op1 and op2 are negative.
691 // Register scratch is destroyed, and it must be different from op2.
692 void NegativeZeroTest(Register result, Register op1, Register op2,
693 Register scratch, Label* then_label);
695 // Try to get function prototype of a function and puts the value in
696 // the result register. Checks that the function really is a
697 // function and jumps to the miss label if the fast checks fail. The
698 // function register will be untouched; the other registers may be
700 void TryGetFunctionPrototype(Register function,
704 bool miss_on_bound_function = false);
706 // Generates code for reporting that an illegal operation has
708 void IllegalOperation(int num_arguments);
710 // Picks out an array index from the hash field.
712 // hash - holds the index's hash. Clobbered.
713 // index - holds the overwritten index on exit.
714 void IndexFromHash(Register hash, Register index);
716 // ---------------------------------------------------------------------------
719 // Call a code stub. Generate the code if necessary.
720 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None());
722 // Tail call a code stub (jump). Generate the code if necessary.
723 void TailCallStub(CodeStub* stub);
725 // Return from a code stub after popping its arguments.
726 void StubReturn(int argc);
728 // Call a runtime routine.
729 void CallRuntime(const Runtime::Function* f, int num_arguments);
730 void CallRuntimeSaveDoubles(Runtime::FunctionId id);
732 // Convenience function: Same as above, but takes the fid instead.
733 void CallRuntime(Runtime::FunctionId id, int num_arguments);
735 // Convenience function: call an external reference.
736 void CallExternalReference(ExternalReference ref, int num_arguments);
738 // Tail call of a runtime routine (jump).
739 // Like JumpToExternalReference, but also takes care of passing the number
741 void TailCallExternalReference(const ExternalReference& ext,
745 // Convenience function: tail call a runtime routine (jump).
746 void TailCallRuntime(Runtime::FunctionId fid,
750 // Before calling a C-function from generated code, align arguments on stack.
751 // After aligning the frame, arguments must be stored in esp[0], esp[4],
752 // etc., not pushed. The argument count assumes all arguments are word sized.
753 // Some compilers/platforms require the stack to be aligned when calling
755 // Needs a scratch register to do some arithmetic. This register will be
757 void PrepareCallCFunction(int num_arguments, Register scratch);
759 // Calls a C function and cleans up the space for arguments allocated
760 // by PrepareCallCFunction. The called function is not allowed to trigger a
761 // garbage collection, since that might move the code and invalidate the
762 // return address (unless this is somehow accounted for by the called
764 void CallCFunction(ExternalReference function, int num_arguments);
765 void CallCFunction(Register function, int num_arguments);
767 // Prepares stack to put arguments (aligns and so on). Reserves
768 // space for return value if needed (assumes the return value is a handle).
769 // Arguments must be stored in ApiParameterOperand(0), ApiParameterOperand(1)
770 // etc. Saves context (esi). If space was reserved for return value then
771 // stores the pointer to the reserved slot into esi.
772 void PrepareCallApiFunction(int argc);
774 // Calls an API function. Allocates HandleScope, extracts returned value
775 // from handle and propagates exceptions. Clobbers ebx, edi and
776 // caller-save registers. Restores context. On return removes
777 // stack_space * kPointerSize (GCed).
778 void CallApiFunctionAndReturn(Address function_address, int stack_space);
780 // Jump to a runtime routine.
781 void JumpToExternalReference(const ExternalReference& ext);
783 // ---------------------------------------------------------------------------
788 // Return and drop arguments from stack, where the number of arguments
789 // may be bigger than 2^16 - 1. Requires a scratch register.
790 void Ret(int bytes_dropped, Register scratch);
792 // Emit code to discard a non-negative number of pointer-sized elements
793 // from the stack, clobbering only the esp register.
794 void Drop(int element_count);
796 void Call(Label* target) { call(target); }
798 // Emit call to the code we are currently generating.
800 Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
801 call(self, RelocInfo::CODE_TARGET);
804 // Move if the registers are not identical.
805 void Move(Register target, Register source);
807 // Push a handle value.
808 void Push(Handle<Object> handle) { push(Immediate(handle)); }
809 void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); }
811 Handle<Object> CodeObject() {
812 ASSERT(!code_object_.is_null());
816 // Insert code to verify that the x87 stack has the specified depth (0-7)
817 void VerifyX87StackDepth(uint32_t depth);
819 // ---------------------------------------------------------------------------
820 // StatsCounter support
822 void SetCounter(StatsCounter* counter, int value);
823 void IncrementCounter(StatsCounter* counter, int value);
824 void DecrementCounter(StatsCounter* counter, int value);
825 void IncrementCounter(Condition cc, StatsCounter* counter, int value);
826 void DecrementCounter(Condition cc, StatsCounter* counter, int value);
829 // ---------------------------------------------------------------------------
832 // Calls Abort(msg) if the condition cc is not satisfied.
833 // Use --debug_code to enable.
834 void Assert(Condition cc, const char* msg);
836 void AssertFastElements(Register elements);
838 // Like Assert(), but always enabled.
839 void Check(Condition cc, const char* msg);
841 // Print a message to stdout and abort execution.
842 void Abort(const char* msg);
844 // Check that the stack is aligned.
845 void CheckStackAlignment();
847 // Verify restrictions about code generated in stubs.
848 void set_generating_stub(bool value) { generating_stub_ = value; }
849 bool generating_stub() { return generating_stub_; }
850 void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; }
851 bool allow_stub_calls() { return allow_stub_calls_; }
852 void set_has_frame(bool value) { has_frame_ = value; }
853 bool has_frame() { return has_frame_; }
854 inline bool AllowThisStubCall(CodeStub* stub);
856 // ---------------------------------------------------------------------------
859 // Check whether the instance type represents a flat ASCII string. Jump to the
860 // label if not. If the instance type can be scratched specify same register
861 // for both instance type and scratch.
862 void JumpIfInstanceTypeIsNotSequentialAscii(Register instance_type,
864 Label* on_not_flat_ascii_string);
866 // Checks if both objects are sequential ASCII strings, and jumps to label
868 void JumpIfNotBothSequentialAsciiStrings(Register object1,
872 Label* on_not_flat_ascii_strings);
874 static int SafepointRegisterStackIndex(Register reg) {
875 return SafepointRegisterStackIndex(reg.code());
878 // Activation support.
879 void EnterFrame(StackFrame::Type type);
880 void LeaveFrame(StackFrame::Type type);
882 // Expects object in eax and returns map with validated enum cache
883 // in eax. Assumes that any other register can be used as a scratch.
884 void CheckEnumCache(Label* call_runtime);
886 // AllocationSiteInfo support. Arrays may have an associated
887 // AllocationSiteInfo object that can be checked for in order to pretransition
889 // On entry, receiver_reg should point to the array object.
890 // scratch_reg gets clobbered.
891 // If allocation info is present, conditional code is set to equal
892 void TestJSArrayForAllocationSiteInfo(Register receiver_reg,
893 Register scratch_reg);
896 bool generating_stub_;
897 bool allow_stub_calls_;
899 // This handle will be patched with the code object on installation.
900 Handle<Object> code_object_;
902 // Helper functions for generating invokes.
903 void InvokePrologue(const ParameterCount& expected,
904 const ParameterCount& actual,
905 Handle<Code> code_constant,
906 const Operand& code_operand,
908 bool* definitely_mismatches,
910 Label::Distance done_distance,
911 const CallWrapper& call_wrapper = NullCallWrapper(),
912 CallKind call_kind = CALL_AS_METHOD);
914 void EnterExitFramePrologue();
915 void EnterExitFrameEpilogue(int argc, bool save_doubles);
917 void LeaveExitFrameEpilogue();
919 // Allocation support helpers.
920 void LoadAllocationTopHelper(Register result,
922 AllocationFlags flags);
924 void UpdateAllocationTopHelper(Register result_end,
926 AllocationFlags flags);
928 // Helper for PopHandleScope. Allowed to perform a GC and returns
929 // NULL if gc_allowed. Does not perform a GC if !gc_allowed, and
930 // possibly returns a failure object indicating an allocation failure.
931 MUST_USE_RESULT MaybeObject* PopHandleScopeHelper(Register saved,
935 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
936 void InNewSpace(Register object,
939 Label* condition_met,
940 Label::Distance condition_met_distance = Label::kFar);
942 // Helper for finding the mark bits for an address. Afterwards, the
943 // bitmap register points at the word with the mark bits and the mask
944 // the position of the first bit. Uses ecx as scratch and leaves addr_reg
946 inline void GetMarkBits(Register addr_reg,
950 // Helper for throwing exceptions. Compute a handler address and jump to
951 // it. See the implementation for register usage.
952 void JumpToHandlerEntry();
954 // Compute memory operands for safepoint stack slots.
955 Operand SafepointRegisterSlot(Register reg);
956 static int SafepointRegisterStackIndex(int reg_code);
958 // Needs access to SafepointRegisterStackIndex for compiled frame
960 friend class StandardFrame;
964 // The code patcher is used to patch (typically) small parts of code e.g. for
965 // debugging and other types of instrumentation. When using the code patcher
966 // the exact number of bytes specified must be emitted. Is not legal to emit
967 // relocation information. If any of these constraints are violated it causes
971 CodePatcher(byte* address, int size);
972 virtual ~CodePatcher();
974 // Macro assembler to emit code.
975 MacroAssembler* masm() { return &masm_; }
978 byte* address_; // The address of the code being patched.
979 int size_; // Number of bytes of the expected patch size.
980 MacroAssembler masm_; // Macro assembler used to generate the code.
984 // -----------------------------------------------------------------------------
985 // Static helper functions.
987 // Generate an Operand for loading a field from an object.
988 inline Operand FieldOperand(Register object, int offset) {
989 return Operand(object, offset - kHeapObjectTag);
993 // Generate an Operand for loading an indexed field from an object.
994 inline Operand FieldOperand(Register object,
998 return Operand(object, index, scale, offset - kHeapObjectTag);
1002 inline Operand ContextOperand(Register context, int index) {
1003 return Operand(context, Context::SlotOffset(index));
1007 inline Operand GlobalObjectOperand() {
1008 return ContextOperand(esi, Context::GLOBAL_OBJECT_INDEX);
1012 // Generates an Operand for saving parameters after PrepareCallApiFunction.
1013 Operand ApiParameterOperand(int index);
1016 #ifdef GENERATED_CODE_COVERAGE
1017 extern void LogGeneratedCodeCoverage(const char* file_line);
1018 #define CODE_COVERAGE_STRINGIFY(x) #x
1019 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
1020 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
1021 #define ACCESS_MASM(masm) { \
1022 byte* ia32_coverage_function = \
1023 reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \
1026 masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \
1027 masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \
1034 #define ACCESS_MASM(masm) masm->
1038 } } // namespace v8::internal
1040 #endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_