1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef V8_X87_MACRO_ASSEMBLER_X87_H_
6 #define V8_X87_MACRO_ASSEMBLER_X87_H_
8 #include "src/assembler.h"
9 #include "src/frames.h"
10 #include "src/globals.h"
15 // Convenience for platform-independent signatures. We do not normally
16 // distinguish memory operands from other operands on ia32.
17 typedef Operand MemOperand;
19 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
20 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
21 enum PointersToHereCheck {
22 kPointersToHereMaybeInteresting,
23 kPointersToHereAreAlwaysInteresting
27 enum RegisterValueType {
28 REGISTER_VALUE_IS_SMI,
29 REGISTER_VALUE_IS_INT32
34 bool AreAliased(Register reg1,
36 Register reg3 = no_reg,
37 Register reg4 = no_reg,
38 Register reg5 = no_reg,
39 Register reg6 = no_reg,
40 Register reg7 = no_reg,
41 Register reg8 = no_reg);
45 // MacroAssembler implements a collection of frequently used macros.
46 class MacroAssembler: public Assembler {
48 // The isolate parameter can be NULL if the macro assembler should
49 // not use isolate-dependent functionality. In this case, it's the
50 // responsibility of the caller to never invoke such function on the
52 MacroAssembler(Isolate* isolate, void* buffer, int size);
54 void Load(Register dst, const Operand& src, Representation r);
55 void Store(Register src, const Operand& dst, Representation r);
57 // Operations on roots in the root-array.
58 void LoadRoot(Register destination, Heap::RootListIndex index);
59 void StoreRoot(Register source, Register scratch, Heap::RootListIndex index);
60 void CompareRoot(Register with, Register scratch, Heap::RootListIndex index);
61 // These methods can only be used with constant roots (i.e. non-writable
62 // and not in new space).
63 void CompareRoot(Register with, Heap::RootListIndex index);
64 void CompareRoot(const Operand& with, Heap::RootListIndex index);
66 // ---------------------------------------------------------------------------
68 enum RememberedSetFinalAction {
73 // Record in the remembered set the fact that we have a pointer to new space
74 // at the address pointed to by the addr register. Only works if addr is not
76 void RememberedSetHelper(Register object, // Used for debug code.
77 Register addr, Register scratch,
78 SaveFPRegsMode save_fp,
79 RememberedSetFinalAction and_then);
81 void CheckPageFlag(Register object,
86 Label::Distance condition_met_distance = Label::kFar);
88 void CheckPageFlagForMap(
93 Label::Distance condition_met_distance = Label::kFar);
95 void CheckMapDeprecated(Handle<Map> map,
97 Label* if_deprecated);
99 // Check if object is in new space. Jumps if the object is not in new space.
100 // The register scratch can be object itself, but scratch will be clobbered.
101 void JumpIfNotInNewSpace(Register object,
104 Label::Distance distance = Label::kFar) {
105 InNewSpace(object, scratch, zero, branch, distance);
108 // Check if object is in new space. Jumps if the object is in new space.
109 // The register scratch can be object itself, but it will be clobbered.
110 void JumpIfInNewSpace(Register object,
113 Label::Distance distance = Label::kFar) {
114 InNewSpace(object, scratch, not_zero, branch, distance);
117 // Check if an object has a given incremental marking color. Also uses ecx!
118 void HasColor(Register object,
122 Label::Distance has_color_distance,
126 void JumpIfBlack(Register object,
130 Label::Distance on_black_distance = Label::kFar);
132 // Checks the color of an object. If the object is already grey or black
133 // then we just fall through, since it is already live. If it is white and
134 // we can determine that it doesn't need to be scanned, then we just mark it
135 // black and fall through. For the rest we jump to the label so the
136 // incremental marker can fix its assumptions.
137 void EnsureNotWhite(Register object,
140 Label* object_is_white_and_not_data,
141 Label::Distance distance);
143 // Notify the garbage collector that we wrote a pointer into an object.
144 // |object| is the object being stored into, |value| is the object being
145 // stored. value and scratch registers are clobbered by the operation.
146 // The offset is the offset from the start of the object, not the offset from
147 // the tagged HeapObject pointer. For use with FieldOperand(reg, off).
148 void RecordWriteField(
149 Register object, int offset, Register value, Register scratch,
150 SaveFPRegsMode save_fp,
151 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
152 SmiCheck smi_check = INLINE_SMI_CHECK,
153 PointersToHereCheck pointers_to_here_check_for_value =
154 kPointersToHereMaybeInteresting);
156 // As above, but the offset has the tag presubtracted. For use with
157 // Operand(reg, off).
158 void RecordWriteContextSlot(
159 Register context, int offset, Register value, Register scratch,
160 SaveFPRegsMode save_fp,
161 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
162 SmiCheck smi_check = INLINE_SMI_CHECK,
163 PointersToHereCheck pointers_to_here_check_for_value =
164 kPointersToHereMaybeInteresting) {
165 RecordWriteField(context, offset + kHeapObjectTag, value, scratch, save_fp,
166 remembered_set_action, smi_check,
167 pointers_to_here_check_for_value);
170 // Notify the garbage collector that we wrote a pointer into a fixed array.
171 // |array| is the array being stored into, |value| is the
172 // object being stored. |index| is the array index represented as a
173 // Smi. All registers are clobbered by the operation RecordWriteArray
174 // filters out smis so it does not update the write barrier if the
176 void RecordWriteArray(
177 Register array, Register value, Register index, SaveFPRegsMode save_fp,
178 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
179 SmiCheck smi_check = INLINE_SMI_CHECK,
180 PointersToHereCheck pointers_to_here_check_for_value =
181 kPointersToHereMaybeInteresting);
183 // For page containing |object| mark region covering |address|
184 // dirty. |object| is the object being stored into, |value| is the
185 // object being stored. The address and value registers are clobbered by the
186 // operation. RecordWrite filters out smis so it does not update the
187 // write barrier if the value is a smi.
189 Register object, Register address, Register value, SaveFPRegsMode save_fp,
190 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
191 SmiCheck smi_check = INLINE_SMI_CHECK,
192 PointersToHereCheck pointers_to_here_check_for_value =
193 kPointersToHereMaybeInteresting);
195 // For page containing |object| mark the region covering the object's map
196 // dirty. |object| is the object being stored into, |map| is the Map object
198 void RecordWriteForMap(Register object, Handle<Map> map, Register scratch1,
199 Register scratch2, SaveFPRegsMode save_fp);
201 // ---------------------------------------------------------------------------
206 // Generates function and stub prologue code.
208 void Prologue(bool code_pre_aging);
210 // Enter specific kind of exit frame. Expects the number of
211 // arguments in register eax and sets up the number of arguments in
212 // register edi and the pointer to the first argument in register
214 void EnterExitFrame(bool save_doubles);
216 void EnterApiExitFrame(int argc);
218 // Leave the current exit frame. Expects the return value in
219 // register eax:edx (untouched) and the pointer to the first
220 // argument in register esi.
221 void LeaveExitFrame(bool save_doubles);
223 // Leave the current exit frame. Expects the return value in
224 // register eax (untouched).
225 void LeaveApiExitFrame(bool restore_context);
227 // Find the function context up the context chain.
228 void LoadContext(Register dst, int context_chain_length);
230 // Conditionally load the cached Array transitioned map of type
231 // transitioned_kind from the native context if the map in register
232 // map_in_out is the cached Array map in the native context of
234 void LoadTransitionedArrayMapConditional(
235 ElementsKind expected_kind,
236 ElementsKind transitioned_kind,
239 Label* no_map_match);
241 // Load the global function with the given index.
242 void LoadGlobalFunction(int index, Register function);
244 // Load the initial map from the global function. The registers
245 // function and map can be the same.
246 void LoadGlobalFunctionInitialMap(Register function, Register map);
248 // Push and pop the registers that can hold pointers.
249 void PushSafepointRegisters() { pushad(); }
250 void PopSafepointRegisters() { popad(); }
251 // Store the value in register/immediate src in the safepoint
252 // register stack slot for register dst.
253 void StoreToSafepointRegisterSlot(Register dst, Register src);
254 void StoreToSafepointRegisterSlot(Register dst, Immediate src);
255 void LoadFromSafepointRegisterSlot(Register dst, Register src);
257 void LoadHeapObject(Register result, Handle<HeapObject> object);
258 void CmpHeapObject(Register reg, Handle<HeapObject> object);
259 void PushHeapObject(Handle<HeapObject> object);
261 void LoadObject(Register result, Handle<Object> object) {
262 AllowDeferredHandleDereference heap_object_check;
263 if (object->IsHeapObject()) {
264 LoadHeapObject(result, Handle<HeapObject>::cast(object));
266 Move(result, Immediate(object));
270 void CmpObject(Register reg, Handle<Object> object) {
271 AllowDeferredHandleDereference heap_object_check;
272 if (object->IsHeapObject()) {
273 CmpHeapObject(reg, Handle<HeapObject>::cast(object));
275 cmp(reg, Immediate(object));
279 // ---------------------------------------------------------------------------
280 // JavaScript invokes
282 // Invoke the JavaScript function code by either calling or jumping.
283 void InvokeCode(Register code,
284 const ParameterCount& expected,
285 const ParameterCount& actual,
287 const CallWrapper& call_wrapper) {
288 InvokeCode(Operand(code), expected, actual, flag, call_wrapper);
291 void InvokeCode(const Operand& code,
292 const ParameterCount& expected,
293 const ParameterCount& actual,
295 const CallWrapper& call_wrapper);
297 // Invoke the JavaScript function in the given register. Changes the
298 // current context to the context in the function before invoking.
299 void InvokeFunction(Register function,
300 const ParameterCount& actual,
302 const CallWrapper& call_wrapper);
304 void InvokeFunction(Register function,
305 const ParameterCount& expected,
306 const ParameterCount& actual,
308 const CallWrapper& call_wrapper);
310 void InvokeFunction(Handle<JSFunction> function,
311 const ParameterCount& expected,
312 const ParameterCount& actual,
314 const CallWrapper& call_wrapper);
316 // Invoke specified builtin JavaScript function. Adds an entry to
317 // the unresolved list if the name does not resolve.
318 void InvokeBuiltin(Builtins::JavaScript id,
320 const CallWrapper& call_wrapper = NullCallWrapper());
322 // Store the function for the given builtin in the target register.
323 void GetBuiltinFunction(Register target, Builtins::JavaScript id);
325 // Store the code object for the given builtin in the target register.
326 void GetBuiltinEntry(Register target, Builtins::JavaScript id);
328 // Expression support
329 // Support for constant splitting.
330 bool IsUnsafeImmediate(const Immediate& x);
331 void SafeMove(Register dst, const Immediate& x);
332 void SafePush(const Immediate& x);
334 // Compare object type for heap object.
335 // Incoming register is heap_object and outgoing register is map.
336 void CmpObjectType(Register heap_object, InstanceType type, Register map);
338 // Compare instance type for map.
339 void CmpInstanceType(Register map, InstanceType type);
341 // Check if a map for a JSObject indicates that the object has fast elements.
342 // Jump to the specified label if it does not.
343 void CheckFastElements(Register map,
345 Label::Distance distance = Label::kFar);
347 // Check if a map for a JSObject indicates that the object can have both smi
348 // and HeapObject elements. Jump to the specified label if it does not.
349 void CheckFastObjectElements(Register map,
351 Label::Distance distance = Label::kFar);
353 // Check if a map for a JSObject indicates that the object has fast smi only
354 // elements. Jump to the specified label if it does not.
355 void CheckFastSmiElements(Register map,
357 Label::Distance distance = Label::kFar);
359 // Check to see if maybe_number can be stored as a double in
360 // FastDoubleElements. If it can, store it at the index specified by key in
361 // the FastDoubleElements array elements, otherwise jump to fail.
362 void StoreNumberToDoubleElements(Register maybe_number,
369 // Compare an object's map with the specified map.
370 void CompareMap(Register obj, Handle<Map> map);
372 // Check if the map of an object is equal to a specified map and branch to
373 // label if not. Skip the smi check if not required (object is known to be a
374 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
375 // against maps that are ElementsKind transition maps of the specified map.
376 void CheckMap(Register obj,
379 SmiCheckType smi_check_type);
381 // Check if the map of an object is equal to a specified map and branch to a
382 // specified target if equal. Skip the smi check if not required (object is
383 // known to be a heap object)
384 void DispatchMap(Register obj,
387 Handle<Code> success,
388 SmiCheckType smi_check_type);
390 // Check if the object in register heap_object is a string. Afterwards the
391 // register map contains the object map and the register instance_type
392 // contains the instance_type. The registers map and instance_type can be the
393 // same in which case it contains the instance type afterwards. Either of the
394 // registers map and instance_type can be the same as heap_object.
395 Condition IsObjectStringType(Register heap_object,
397 Register instance_type);
399 // Check if the object in register heap_object is a name. Afterwards the
400 // register map contains the object map and the register instance_type
401 // contains the instance_type. The registers map and instance_type can be the
402 // same in which case it contains the instance type afterwards. Either of the
403 // registers map and instance_type can be the same as heap_object.
404 Condition IsObjectNameType(Register heap_object,
406 Register instance_type);
408 // Check if a heap object's type is in the JSObject range, not including
409 // JSFunction. The object's map will be loaded in the map register.
410 // Any or all of the three registers may be the same.
411 // The contents of the scratch register will always be overwritten.
412 void IsObjectJSObjectType(Register heap_object,
417 // The contents of the scratch register will be overwritten.
418 void IsInstanceJSObjectType(Register map, Register scratch, Label* fail);
420 // FCmp is similar to integer cmp, but requires unsigned
421 // jcc instructions (je, ja, jae, jb, jbe, je, and jz).
423 void FXamMinusZero();
426 void X87SetRC(int rc);
428 void ClampUint8(Register reg);
429 void ClampTOSToUint8(Register result_reg);
431 void SlowTruncateToI(Register result_reg, Register input_reg,
432 int offset = HeapNumber::kValueOffset - kHeapObjectTag);
434 void TruncateHeapNumberToI(Register result_reg, Register input_reg);
435 void TruncateX87TOSToI(Register result_reg);
437 void X87TOSToI(Register result_reg, MinusZeroMode minus_zero_mode,
438 Label* lost_precision, Label* is_nan, Label* minus_zero,
439 Label::Distance dst = Label::kFar);
441 // Smi tagging support.
442 void SmiTag(Register reg) {
443 STATIC_ASSERT(kSmiTag == 0);
444 STATIC_ASSERT(kSmiTagSize == 1);
447 void SmiUntag(Register reg) {
448 sar(reg, kSmiTagSize);
451 // Modifies the register even if it does not contain a Smi!
452 void SmiUntag(Register reg, Label* is_smi) {
453 STATIC_ASSERT(kSmiTagSize == 1);
454 sar(reg, kSmiTagSize);
455 STATIC_ASSERT(kSmiTag == 0);
456 j(not_carry, is_smi);
459 void LoadUint32NoSSE2(Register src);
461 // Jump the register contains a smi.
462 inline void JumpIfSmi(Register value,
464 Label::Distance distance = Label::kFar) {
465 test(value, Immediate(kSmiTagMask));
466 j(zero, smi_label, distance);
468 // Jump if the operand is a smi.
469 inline void JumpIfSmi(Operand value,
471 Label::Distance distance = Label::kFar) {
472 test(value, Immediate(kSmiTagMask));
473 j(zero, smi_label, distance);
475 // Jump if register contain a non-smi.
476 inline void JumpIfNotSmi(Register value,
477 Label* not_smi_label,
478 Label::Distance distance = Label::kFar) {
479 test(value, Immediate(kSmiTagMask));
480 j(not_zero, not_smi_label, distance);
483 void LoadInstanceDescriptors(Register map, Register descriptors);
484 void EnumLength(Register dst, Register map);
485 void NumberOfOwnDescriptors(Register dst, Register map);
487 template<typename Field>
488 void DecodeField(Register reg) {
489 static const int shift = Field::kShift;
490 static const int mask = Field::kMask >> Field::kShift;
494 and_(reg, Immediate(mask));
497 template<typename Field>
498 void DecodeFieldToSmi(Register reg) {
499 static const int shift = Field::kShift;
500 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize;
501 STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0);
502 STATIC_ASSERT(kSmiTag == 0);
503 if (shift < kSmiTagSize) {
504 shl(reg, kSmiTagSize - shift);
505 } else if (shift > kSmiTagSize) {
506 sar(reg, shift - kSmiTagSize);
508 and_(reg, Immediate(mask));
511 // Abort execution if argument is not a number, enabled via --debug-code.
512 void AssertNumber(Register object);
514 // Abort execution if argument is not a smi, enabled via --debug-code.
515 void AssertSmi(Register object);
517 // Abort execution if argument is a smi, enabled via --debug-code.
518 void AssertNotSmi(Register object);
520 // Abort execution if argument is not a string, enabled via --debug-code.
521 void AssertString(Register object);
523 // Abort execution if argument is not a name, enabled via --debug-code.
524 void AssertName(Register object);
526 // Abort execution if argument is not undefined or an AllocationSite, enabled
528 void AssertUndefinedOrAllocationSite(Register object);
530 // ---------------------------------------------------------------------------
531 // Exception handling
533 // Push a new try handler and link it into try handler chain.
534 void PushTryHandler(StackHandler::Kind kind, int handler_index);
536 // Unlink the stack handler on top of the stack from the try handler chain.
537 void PopTryHandler();
539 // Throw to the top handler in the try hander chain.
540 void Throw(Register value);
542 // Throw past all JS frames to the top JS entry frame.
543 void ThrowUncatchable(Register value);
545 // ---------------------------------------------------------------------------
546 // Inline caching support
548 // Generate code for checking access rights - used for security checks
549 // on access to global objects across environments. The holder register
550 // is left untouched, but the scratch register is clobbered.
551 void CheckAccessGlobalProxy(Register holder_reg,
556 void GetNumberHash(Register r0, Register scratch);
558 void LoadFromNumberDictionary(Label* miss,
567 // ---------------------------------------------------------------------------
568 // Allocation support
570 // Allocate an object in new space or old pointer space. If the given space
571 // is exhausted control continues at the gc_required label. The allocated
572 // object is returned in result and end of the new object is returned in
573 // result_end. The register scratch can be passed as no_reg in which case
574 // an additional object reference will be added to the reloc info. The
575 // returned pointers in result and result_end have not yet been tagged as
576 // heap objects. If result_contains_top_on_entry is true the content of
577 // result is known to be the allocation top on entry (could be result_end
578 // from a previous call). If result_contains_top_on_entry is true scratch
579 // should be no_reg as it is never used.
580 void Allocate(int object_size,
585 AllocationFlags flags);
587 void Allocate(int header_size,
588 ScaleFactor element_size,
589 Register element_count,
590 RegisterValueType element_count_type,
595 AllocationFlags flags);
597 void Allocate(Register object_size,
602 AllocationFlags flags);
604 // Undo allocation in new space. The object passed and objects allocated after
605 // it will no longer be allocated. Make sure that no pointers are left to the
606 // object(s) no longer allocated as they would be invalid when allocation is
608 void UndoAllocationInNewSpace(Register object);
610 // Allocate a heap number in new space with undefined value. The
611 // register scratch2 can be passed as no_reg; the others must be
612 // valid registers. Returns tagged pointer in result register, or
613 // jumps to gc_required if new space is full.
614 void AllocateHeapNumber(Register result,
618 MutableMode mode = IMMUTABLE);
620 // Allocate a sequential string. All the header fields of the string object
622 void AllocateTwoByteString(Register result,
628 void AllocateOneByteString(Register result, Register length,
629 Register scratch1, Register scratch2,
630 Register scratch3, Label* gc_required);
631 void AllocateOneByteString(Register result, int length, Register scratch1,
632 Register scratch2, Label* gc_required);
634 // Allocate a raw cons string object. Only the map field of the result is
636 void AllocateTwoByteConsString(Register result,
640 void AllocateOneByteConsString(Register result, Register scratch1,
641 Register scratch2, Label* gc_required);
643 // Allocate a raw sliced string object. Only the map field of the result is
645 void AllocateTwoByteSlicedString(Register result,
649 void AllocateOneByteSlicedString(Register result, Register scratch1,
650 Register scratch2, Label* gc_required);
652 // Copy memory, byte-by-byte, from source to destination. Not optimized for
653 // long or aligned copies.
654 // The contents of index and scratch are destroyed.
655 void CopyBytes(Register source,
656 Register destination,
660 // Initialize fields with filler values. Fields starting at |start_offset|
661 // not including end_offset are overwritten with the value in |filler|. At
662 // the end the loop, |start_offset| takes the value of |end_offset|.
663 void InitializeFieldsWithFiller(Register start_offset,
667 // ---------------------------------------------------------------------------
668 // Support functions.
670 // Check a boolean-bit of a Smi field.
671 void BooleanBitTest(Register object, int field_offset, int bit_index);
673 // Check if result is zero and op is negative.
674 void NegativeZeroTest(Register result, Register op, Label* then_label);
676 // Check if result is zero and any of op1 and op2 are negative.
677 // Register scratch is destroyed, and it must be different from op2.
678 void NegativeZeroTest(Register result, Register op1, Register op2,
679 Register scratch, Label* then_label);
681 // Try to get function prototype of a function and puts the value in
682 // the result register. Checks that the function really is a
683 // function and jumps to the miss label if the fast checks fail. The
684 // function register will be untouched; the other registers may be
686 void TryGetFunctionPrototype(Register function,
690 bool miss_on_bound_function = false);
692 // Picks out an array index from the hash field.
694 // hash - holds the index's hash. Clobbered.
695 // index - holds the overwritten index on exit.
696 void IndexFromHash(Register hash, Register index);
698 // ---------------------------------------------------------------------------
701 // Call a code stub. Generate the code if necessary.
702 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None());
704 // Tail call a code stub (jump). Generate the code if necessary.
705 void TailCallStub(CodeStub* stub);
707 // Return from a code stub after popping its arguments.
708 void StubReturn(int argc);
710 // Call a runtime routine.
711 void CallRuntime(const Runtime::Function* f, int num_arguments,
712 SaveFPRegsMode save_doubles = kDontSaveFPRegs);
713 void CallRuntimeSaveDoubles(Runtime::FunctionId id) {
714 const Runtime::Function* function = Runtime::FunctionForId(id);
715 CallRuntime(function, function->nargs, kSaveFPRegs);
718 // Convenience function: Same as above, but takes the fid instead.
719 void CallRuntime(Runtime::FunctionId id, int num_arguments,
720 SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
721 CallRuntime(Runtime::FunctionForId(id), num_arguments, save_doubles);
724 // Convenience function: call an external reference.
725 void CallExternalReference(ExternalReference ref, int num_arguments);
727 // Tail call of a runtime routine (jump).
728 // Like JumpToExternalReference, but also takes care of passing the number
730 void TailCallExternalReference(const ExternalReference& ext,
734 // Convenience function: tail call a runtime routine (jump).
735 void TailCallRuntime(Runtime::FunctionId fid,
739 // Before calling a C-function from generated code, align arguments on stack.
740 // After aligning the frame, arguments must be stored in esp[0], esp[4],
741 // etc., not pushed. The argument count assumes all arguments are word sized.
742 // Some compilers/platforms require the stack to be aligned when calling
744 // Needs a scratch register to do some arithmetic. This register will be
746 void PrepareCallCFunction(int num_arguments, Register scratch);
748 // Calls a C function and cleans up the space for arguments allocated
749 // by PrepareCallCFunction. The called function is not allowed to trigger a
750 // garbage collection, since that might move the code and invalidate the
751 // return address (unless this is somehow accounted for by the called
753 void CallCFunction(ExternalReference function, int num_arguments);
754 void CallCFunction(Register function, int num_arguments);
756 // Prepares stack to put arguments (aligns and so on). Reserves
757 // space for return value if needed (assumes the return value is a handle).
758 // Arguments must be stored in ApiParameterOperand(0), ApiParameterOperand(1)
759 // etc. Saves context (esi). If space was reserved for return value then
760 // stores the pointer to the reserved slot into esi.
761 void PrepareCallApiFunction(int argc);
763 // Calls an API function. Allocates HandleScope, extracts returned value
764 // from handle and propagates exceptions. Clobbers ebx, edi and
765 // caller-save registers. Restores context. On return removes
766 // stack_space * kPointerSize (GCed).
767 void CallApiFunctionAndReturn(Register function_address,
768 ExternalReference thunk_ref,
769 Operand thunk_last_arg,
771 Operand return_value_operand,
772 Operand* context_restore_operand);
774 // Jump to a runtime routine.
775 void JumpToExternalReference(const ExternalReference& ext);
777 // ---------------------------------------------------------------------------
782 // Return and drop arguments from stack, where the number of arguments
783 // may be bigger than 2^16 - 1. Requires a scratch register.
784 void Ret(int bytes_dropped, Register scratch);
786 // Emit code to discard a non-negative number of pointer-sized elements
787 // from the stack, clobbering only the esp register.
788 void Drop(int element_count);
790 void Call(Label* target) { call(target); }
791 void Push(Register src) { push(src); }
792 void Pop(Register dst) { pop(dst); }
794 // Emit call to the code we are currently generating.
796 Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
797 call(self, RelocInfo::CODE_TARGET);
800 // Move if the registers are not identical.
801 void Move(Register target, Register source);
803 // Move a constant into a destination using the most efficient encoding.
804 void Move(Register dst, const Immediate& x);
805 void Move(const Operand& dst, const Immediate& x);
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 DCHECK(!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 // Emit code for a truncating division by a constant. The dividend register is
820 // unchanged, the result is in edx, and eax gets clobbered.
821 void TruncatingDiv(Register dividend, int32_t divisor);
823 // ---------------------------------------------------------------------------
824 // StatsCounter support
826 void SetCounter(StatsCounter* counter, int value);
827 void IncrementCounter(StatsCounter* counter, int value);
828 void DecrementCounter(StatsCounter* counter, int value);
829 void IncrementCounter(Condition cc, StatsCounter* counter, int value);
830 void DecrementCounter(Condition cc, StatsCounter* counter, int value);
833 // ---------------------------------------------------------------------------
836 // Calls Abort(msg) if the condition cc is not satisfied.
837 // Use --debug_code to enable.
838 void Assert(Condition cc, BailoutReason reason);
840 void AssertFastElements(Register elements);
842 // Like Assert(), but always enabled.
843 void Check(Condition cc, BailoutReason reason);
845 // Print a message to stdout and abort execution.
846 void Abort(BailoutReason reason);
848 // Check that the stack is aligned.
849 void CheckStackAlignment();
851 // Verify restrictions about code generated in stubs.
852 void set_generating_stub(bool value) { generating_stub_ = value; }
853 bool generating_stub() { return generating_stub_; }
854 void set_has_frame(bool value) { has_frame_ = value; }
855 bool has_frame() { return has_frame_; }
856 inline bool AllowThisStubCall(CodeStub* stub);
858 // ---------------------------------------------------------------------------
861 // Generate code to do a lookup in the number string cache. If the number in
862 // the register object is found in the cache the generated code falls through
863 // with the result in the result register. The object and the result register
864 // can be the same. If the number is not found in the cache the code jumps to
865 // the label not_found with only the content of register object unchanged.
866 void LookupNumberStringCache(Register object,
872 // Check whether the instance type represents a flat one-byte string. Jump to
873 // the label if not. If the instance type can be scratched specify same
874 // register for both instance type and scratch.
875 void JumpIfInstanceTypeIsNotSequentialOneByte(
876 Register instance_type, Register scratch,
877 Label* on_not_flat_one_byte_string);
879 // Checks if both objects are sequential one-byte strings, and jumps to label
881 void JumpIfNotBothSequentialOneByteStrings(
882 Register object1, Register object2, Register scratch1, Register scratch2,
883 Label* on_not_flat_one_byte_strings);
885 // Checks if the given register or operand is a unique name
886 void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name,
887 Label::Distance distance = Label::kFar) {
888 JumpIfNotUniqueNameInstanceType(Operand(reg), not_unique_name, distance);
891 void JumpIfNotUniqueNameInstanceType(Operand operand, Label* not_unique_name,
892 Label::Distance distance = Label::kFar);
894 void EmitSeqStringSetCharCheck(Register string,
897 uint32_t encoding_mask);
899 static int SafepointRegisterStackIndex(Register reg) {
900 return SafepointRegisterStackIndex(reg.code());
903 // Activation support.
904 void EnterFrame(StackFrame::Type type);
905 void LeaveFrame(StackFrame::Type type);
907 // Expects object in eax and returns map with validated enum cache
908 // in eax. Assumes that any other register can be used as a scratch.
909 void CheckEnumCache(Label* call_runtime);
911 // AllocationMemento support. Arrays may have an associated
912 // AllocationMemento object that can be checked for in order to pretransition
914 // On entry, receiver_reg should point to the array object.
915 // scratch_reg gets clobbered.
916 // If allocation info is present, conditional code is set to equal.
917 void TestJSArrayForAllocationMemento(Register receiver_reg,
918 Register scratch_reg,
919 Label* no_memento_found);
921 void JumpIfJSArrayHasAllocationMemento(Register receiver_reg,
922 Register scratch_reg,
923 Label* memento_found) {
924 Label no_memento_found;
925 TestJSArrayForAllocationMemento(receiver_reg, scratch_reg,
927 j(equal, memento_found);
928 bind(&no_memento_found);
931 // Jumps to found label if a prototype map has dictionary elements.
932 void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0,
933 Register scratch1, Label* found);
936 bool generating_stub_;
938 // This handle will be patched with the code object on installation.
939 Handle<Object> code_object_;
941 // Helper functions for generating invokes.
942 void InvokePrologue(const ParameterCount& expected,
943 const ParameterCount& actual,
944 Handle<Code> code_constant,
945 const Operand& code_operand,
947 bool* definitely_mismatches,
949 Label::Distance done_distance,
950 const CallWrapper& call_wrapper = NullCallWrapper());
952 void EnterExitFramePrologue();
953 void EnterExitFrameEpilogue(int argc, bool save_doubles);
955 void LeaveExitFrameEpilogue(bool restore_context);
957 // Allocation support helpers.
958 void LoadAllocationTopHelper(Register result,
960 AllocationFlags flags);
962 void UpdateAllocationTopHelper(Register result_end,
964 AllocationFlags flags);
966 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
967 void InNewSpace(Register object,
970 Label* condition_met,
971 Label::Distance condition_met_distance = Label::kFar);
973 // Helper for finding the mark bits for an address. Afterwards, the
974 // bitmap register points at the word with the mark bits and the mask
975 // the position of the first bit. Uses ecx as scratch and leaves addr_reg
977 inline void GetMarkBits(Register addr_reg,
981 // Helper for throwing exceptions. Compute a handler address and jump to
982 // it. See the implementation for register usage.
983 void JumpToHandlerEntry();
985 // Compute memory operands for safepoint stack slots.
986 Operand SafepointRegisterSlot(Register reg);
987 static int SafepointRegisterStackIndex(int reg_code);
989 // Needs access to SafepointRegisterStackIndex for compiled frame
991 friend class StandardFrame;
995 // The code patcher is used to patch (typically) small parts of code e.g. for
996 // debugging and other types of instrumentation. When using the code patcher
997 // the exact number of bytes specified must be emitted. Is not legal to emit
998 // relocation information. If any of these constraints are violated it causes
1002 CodePatcher(byte* address, int size);
1003 virtual ~CodePatcher();
1005 // Macro assembler to emit code.
1006 MacroAssembler* masm() { return &masm_; }
1009 byte* address_; // The address of the code being patched.
1010 int size_; // Number of bytes of the expected patch size.
1011 MacroAssembler masm_; // Macro assembler used to generate the code.
1015 // -----------------------------------------------------------------------------
1016 // Static helper functions.
1018 // Generate an Operand for loading a field from an object.
1019 inline Operand FieldOperand(Register object, int offset) {
1020 return Operand(object, offset - kHeapObjectTag);
1024 // Generate an Operand for loading an indexed field from an object.
1025 inline Operand FieldOperand(Register object,
1029 return Operand(object, index, scale, offset - kHeapObjectTag);
1033 inline Operand FixedArrayElementOperand(Register array,
1034 Register index_as_smi,
1035 int additional_offset = 0) {
1036 int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize;
1037 return FieldOperand(array, index_as_smi, times_half_pointer_size, offset);
1041 inline Operand ContextOperand(Register context, int index) {
1042 return Operand(context, Context::SlotOffset(index));
1046 inline Operand GlobalObjectOperand() {
1047 return ContextOperand(esi, Context::GLOBAL_OBJECT_INDEX);
1051 // Generates an Operand for saving parameters after PrepareCallApiFunction.
1052 Operand ApiParameterOperand(int index);
1055 #ifdef GENERATED_CODE_COVERAGE
1056 extern void LogGeneratedCodeCoverage(const char* file_line);
1057 #define CODE_COVERAGE_STRINGIFY(x) #x
1058 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
1059 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
1060 #define ACCESS_MASM(masm) { \
1061 byte* ia32_coverage_function = \
1062 reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \
1065 masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \
1066 masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \
1073 #define ACCESS_MASM(masm) masm->
1077 } } // namespace v8::internal
1079 #endif // V8_X87_MACRO_ASSEMBLER_X87_H_