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_X64_MACRO_ASSEMBLER_X64_H_
6 #define V8_X64_MACRO_ASSEMBLER_X64_H_
8 #include "src/assembler.h"
9 #include "src/frames.h"
10 #include "src/globals.h"
15 // Default scratch register used by MacroAssembler (and other code that needs
16 // a spare register). The register isn't callee save, and not used by the
17 // function calling convention.
18 const Register kScratchRegister = { 10 }; // r10.
19 const Register kSmiConstantRegister = { 12 }; // r12 (callee save).
20 const Register kRootRegister = { 13 }; // r13 (callee save).
21 // Value of smi in kSmiConstantRegister.
22 const int kSmiConstantRegisterValue = 1;
23 // Actual value of root register is offset from the root array's start
24 // to take advantage of negitive 8-bit displacement values.
25 const int kRootRegisterBias = 128;
27 // Convenience for platform-independent signatures.
28 typedef Operand MemOperand;
30 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
31 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
32 enum PointersToHereCheck {
33 kPointersToHereMaybeInteresting,
34 kPointersToHereAreAlwaysInteresting
37 enum SmiOperationConstraint {
38 PRESERVE_SOURCE_REGISTER,
39 BAILOUT_ON_NO_OVERFLOW,
44 STATIC_ASSERT(NUMBER_OF_CONSTRAINTS <= 8);
46 class SmiOperationExecutionMode : public EnumSet<SmiOperationConstraint, byte> {
48 SmiOperationExecutionMode() : EnumSet<SmiOperationConstraint, byte>(0) { }
49 explicit SmiOperationExecutionMode(byte bits)
50 : EnumSet<SmiOperationConstraint, byte>(bits) { }
54 bool AreAliased(Register reg1,
56 Register reg3 = no_reg,
57 Register reg4 = no_reg,
58 Register reg5 = no_reg,
59 Register reg6 = no_reg,
60 Register reg7 = no_reg,
61 Register reg8 = no_reg);
64 // Forward declaration.
68 SmiIndex(Register index_register, ScaleFactor scale)
69 : reg(index_register),
76 // MacroAssembler implements a collection of frequently used macros.
77 class MacroAssembler: public Assembler {
79 // The isolate parameter can be NULL if the macro assembler should
80 // not use isolate-dependent functionality. In this case, it's the
81 // responsibility of the caller to never invoke such function on the
83 MacroAssembler(Isolate* isolate, void* buffer, int size);
85 // Prevent the use of the RootArray during the lifetime of this
87 class NoRootArrayScope BASE_EMBEDDED {
89 explicit NoRootArrayScope(MacroAssembler* assembler)
90 : variable_(&assembler->root_array_available_),
91 old_value_(assembler->root_array_available_) {
92 assembler->root_array_available_ = false;
95 *variable_ = old_value_;
102 // Operand pointing to an external reference.
103 // May emit code to set up the scratch register. The operand is
104 // only guaranteed to be correct as long as the scratch register
106 // If the operand is used more than once, use a scratch register
107 // that is guaranteed not to be clobbered.
108 Operand ExternalOperand(ExternalReference reference,
109 Register scratch = kScratchRegister);
110 // Loads and stores the value of an external reference.
111 // Special case code for load and store to take advantage of
112 // load_rax/store_rax if possible/necessary.
113 // For other operations, just use:
114 // Operand operand = ExternalOperand(extref);
115 // operation(operand, ..);
116 void Load(Register destination, ExternalReference source);
117 void Store(ExternalReference destination, Register source);
118 // Loads the address of the external reference into the destination
120 void LoadAddress(Register destination, ExternalReference source);
121 // Returns the size of the code generated by LoadAddress.
122 // Used by CallSize(ExternalReference) to find the size of a call.
123 int LoadAddressSize(ExternalReference source);
124 // Pushes the address of the external reference onto the stack.
125 void PushAddress(ExternalReference source);
127 // Operations on roots in the root-array.
128 void LoadRoot(Register destination, Heap::RootListIndex index);
129 void StoreRoot(Register source, Heap::RootListIndex index);
130 // Load a root value where the index (or part of it) is variable.
131 // The variable_offset register is added to the fixed_offset value
132 // to get the index into the root-array.
133 void LoadRootIndexed(Register destination,
134 Register variable_offset,
136 void CompareRoot(Register with, Heap::RootListIndex index);
137 void CompareRoot(const Operand& with, Heap::RootListIndex index);
138 void PushRoot(Heap::RootListIndex index);
140 // These functions do not arrange the registers in any particular order so
141 // they are not useful for calls that can cause a GC. The caller can
142 // exclude up to 3 registers that do not need to be saved and restored.
143 void PushCallerSaved(SaveFPRegsMode fp_mode,
144 Register exclusion1 = no_reg,
145 Register exclusion2 = no_reg,
146 Register exclusion3 = no_reg);
147 void PopCallerSaved(SaveFPRegsMode fp_mode,
148 Register exclusion1 = no_reg,
149 Register exclusion2 = no_reg,
150 Register exclusion3 = no_reg);
152 // ---------------------------------------------------------------------------
156 enum RememberedSetFinalAction {
161 // Record in the remembered set the fact that we have a pointer to new space
162 // at the address pointed to by the addr register. Only works if addr is not
164 void RememberedSetHelper(Register object, // Used for debug code.
167 SaveFPRegsMode save_fp,
168 RememberedSetFinalAction and_then);
170 void CheckPageFlag(Register object,
174 Label* condition_met,
175 Label::Distance condition_met_distance = Label::kFar);
177 void CheckMapDeprecated(Handle<Map> map,
179 Label* if_deprecated);
181 // Check if object is in new space. Jumps if the object is not in new space.
182 // The register scratch can be object itself, but scratch will be clobbered.
183 void JumpIfNotInNewSpace(Register object,
186 Label::Distance distance = Label::kFar) {
187 InNewSpace(object, scratch, not_equal, branch, distance);
190 // Check if object is in new space. Jumps if the object is in new space.
191 // The register scratch can be object itself, but it will be clobbered.
192 void JumpIfInNewSpace(Register object,
195 Label::Distance distance = Label::kFar) {
196 InNewSpace(object, scratch, equal, branch, distance);
199 // Check if an object has the black incremental marking color. Also uses rcx!
200 void JumpIfBlack(Register object,
204 Label::Distance on_black_distance = Label::kFar);
206 // Detects conservatively whether an object is data-only, i.e. it does need to
207 // be scanned by the garbage collector.
208 void JumpIfDataObject(Register value,
210 Label* not_data_object,
211 Label::Distance not_data_object_distance);
213 // Checks the color of an object. If the object is already grey or black
214 // then we just fall through, since it is already live. If it is white and
215 // we can determine that it doesn't need to be scanned, then we just mark it
216 // black and fall through. For the rest we jump to the label so the
217 // incremental marker can fix its assumptions.
218 void EnsureNotWhite(Register object,
221 Label* object_is_white_and_not_data,
222 Label::Distance distance);
224 // Notify the garbage collector that we wrote a pointer into an object.
225 // |object| is the object being stored into, |value| is the object being
226 // stored. value and scratch registers are clobbered by the operation.
227 // The offset is the offset from the start of the object, not the offset from
228 // the tagged HeapObject pointer. For use with FieldOperand(reg, off).
229 void RecordWriteField(
234 SaveFPRegsMode save_fp,
235 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
236 SmiCheck smi_check = INLINE_SMI_CHECK,
237 PointersToHereCheck pointers_to_here_check_for_value =
238 kPointersToHereMaybeInteresting);
240 // As above, but the offset has the tag presubtracted. For use with
241 // Operand(reg, off).
242 void RecordWriteContextSlot(
247 SaveFPRegsMode save_fp,
248 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
249 SmiCheck smi_check = INLINE_SMI_CHECK,
250 PointersToHereCheck pointers_to_here_check_for_value =
251 kPointersToHereMaybeInteresting) {
252 RecordWriteField(context,
253 offset + kHeapObjectTag,
257 remembered_set_action,
259 pointers_to_here_check_for_value);
262 // Notify the garbage collector that we wrote a pointer into a fixed array.
263 // |array| is the array being stored into, |value| is the
264 // object being stored. |index| is the array index represented as a non-smi.
265 // All registers are clobbered by the operation RecordWriteArray
266 // filters out smis so it does not update the write barrier if the
268 void RecordWriteArray(
272 SaveFPRegsMode save_fp,
273 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
274 SmiCheck smi_check = INLINE_SMI_CHECK,
275 PointersToHereCheck pointers_to_here_check_for_value =
276 kPointersToHereMaybeInteresting);
278 void RecordWriteForMap(
282 SaveFPRegsMode save_fp);
284 // For page containing |object| mark region covering |address|
285 // dirty. |object| is the object being stored into, |value| is the
286 // object being stored. The address and value registers are clobbered by the
287 // operation. RecordWrite filters out smis so it does not update
288 // the write barrier if the value is a smi.
293 SaveFPRegsMode save_fp,
294 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
295 SmiCheck smi_check = INLINE_SMI_CHECK,
296 PointersToHereCheck pointers_to_here_check_for_value =
297 kPointersToHereMaybeInteresting);
299 // ---------------------------------------------------------------------------
304 // Generates function and stub prologue code.
306 void Prologue(bool code_pre_aging);
308 // Enter specific kind of exit frame; either in normal or
309 // debug mode. Expects the number of arguments in register rax and
310 // sets up the number of arguments in register rdi and the pointer
311 // to the first argument in register rsi.
313 // Allocates arg_stack_space * kPointerSize memory (not GCed) on the stack
314 // accessible via StackSpaceOperand.
315 void EnterExitFrame(int arg_stack_space = 0, bool save_doubles = false);
317 // Enter specific kind of exit frame. Allocates arg_stack_space * kPointerSize
318 // memory (not GCed) on the stack accessible via StackSpaceOperand.
319 void EnterApiExitFrame(int arg_stack_space);
321 // Leave the current exit frame. Expects/provides the return value in
322 // register rax:rdx (untouched) and the pointer to the first
323 // argument in register rsi.
324 void LeaveExitFrame(bool save_doubles = false);
326 // Leave the current exit frame. Expects/provides the return value in
327 // register rax (untouched).
328 void LeaveApiExitFrame(bool restore_context);
330 // Push and pop the registers that can hold pointers.
331 void PushSafepointRegisters() { Pushad(); }
332 void PopSafepointRegisters() { Popad(); }
333 // Store the value in register src in the safepoint register stack
334 // slot for register dst.
335 void StoreToSafepointRegisterSlot(Register dst, const Immediate& imm);
336 void StoreToSafepointRegisterSlot(Register dst, Register src);
337 void LoadFromSafepointRegisterSlot(Register dst, Register src);
339 void InitializeRootRegister() {
340 ExternalReference roots_array_start =
341 ExternalReference::roots_array_start(isolate());
342 Move(kRootRegister, roots_array_start);
343 addp(kRootRegister, Immediate(kRootRegisterBias));
346 // ---------------------------------------------------------------------------
347 // JavaScript invokes
349 // Invoke the JavaScript function code by either calling or jumping.
350 void InvokeCode(Register code,
351 const ParameterCount& expected,
352 const ParameterCount& actual,
354 const CallWrapper& call_wrapper);
356 // Invoke the JavaScript function in the given register. Changes the
357 // current context to the context in the function before invoking.
358 void InvokeFunction(Register function,
359 const ParameterCount& actual,
361 const CallWrapper& call_wrapper);
363 void InvokeFunction(Register function,
364 const ParameterCount& expected,
365 const ParameterCount& actual,
367 const CallWrapper& call_wrapper);
369 void InvokeFunction(Handle<JSFunction> function,
370 const ParameterCount& expected,
371 const ParameterCount& actual,
373 const CallWrapper& call_wrapper);
375 // Invoke specified builtin JavaScript function. Adds an entry to
376 // the unresolved list if the name does not resolve.
377 void InvokeBuiltin(Builtins::JavaScript id,
379 const CallWrapper& call_wrapper = NullCallWrapper());
381 // Store the function for the given builtin in the target register.
382 void GetBuiltinFunction(Register target, Builtins::JavaScript id);
384 // Store the code object for the given builtin in the target register.
385 void GetBuiltinEntry(Register target, Builtins::JavaScript id);
388 // ---------------------------------------------------------------------------
389 // Smi tagging, untagging and operations on tagged smis.
391 // Support for constant splitting.
392 bool IsUnsafeInt(const int32_t x);
393 void SafeMove(Register dst, Smi* src);
394 void SafePush(Smi* src);
396 void InitializeSmiConstantRegister() {
397 Move(kSmiConstantRegister, Smi::FromInt(kSmiConstantRegisterValue),
398 Assembler::RelocInfoNone());
401 // Conversions between tagged smi values and non-tagged integer values.
403 // Tag an integer value. The result must be known to be a valid smi value.
404 // Only uses the low 32 bits of the src register. Sets the N and Z flags
405 // based on the value of the resulting smi.
406 void Integer32ToSmi(Register dst, Register src);
408 // Stores an integer32 value into a memory field that already holds a smi.
409 void Integer32ToSmiField(const Operand& dst, Register src);
411 // Adds constant to src and tags the result as a smi.
412 // Result must be a valid smi.
413 void Integer64PlusConstantToSmi(Register dst, Register src, int constant);
415 // Convert smi to 32-bit integer. I.e., not sign extended into
416 // high 32 bits of destination.
417 void SmiToInteger32(Register dst, Register src);
418 void SmiToInteger32(Register dst, const Operand& src);
420 // Convert smi to 64-bit integer (sign extended if necessary).
421 void SmiToInteger64(Register dst, Register src);
422 void SmiToInteger64(Register dst, const Operand& src);
424 // Multiply a positive smi's integer value by a power of two.
425 // Provides result as 64-bit integer value.
426 void PositiveSmiTimesPowerOfTwoToInteger64(Register dst,
430 // Divide a positive smi's integer value by a power of two.
431 // Provides result as 32-bit integer value.
432 void PositiveSmiDivPowerOfTwoToInteger32(Register dst,
436 // Perform the logical or of two smi values and return a smi value.
437 // If either argument is not a smi, jump to on_not_smis and retain
438 // the original values of source registers. The destination register
439 // may be changed if it's not one of the source registers.
440 void SmiOrIfSmis(Register dst,
444 Label::Distance near_jump = Label::kFar);
447 // Simple comparison of smis. Both sides must be known smis to use these,
448 // otherwise use Cmp.
449 void SmiCompare(Register smi1, Register smi2);
450 void SmiCompare(Register dst, Smi* src);
451 void SmiCompare(Register dst, const Operand& src);
452 void SmiCompare(const Operand& dst, Register src);
453 void SmiCompare(const Operand& dst, Smi* src);
454 // Compare the int32 in src register to the value of the smi stored at dst.
455 void SmiCompareInteger32(const Operand& dst, Register src);
456 // Sets sign and zero flags depending on value of smi in register.
457 void SmiTest(Register src);
459 // Functions performing a check on a known or potential smi. Returns
460 // a condition that is satisfied if the check is successful.
462 // Is the value a tagged smi.
463 Condition CheckSmi(Register src);
464 Condition CheckSmi(const Operand& src);
466 // Is the value a non-negative tagged smi.
467 Condition CheckNonNegativeSmi(Register src);
469 // Are both values tagged smis.
470 Condition CheckBothSmi(Register first, Register second);
472 // Are both values non-negative tagged smis.
473 Condition CheckBothNonNegativeSmi(Register first, Register second);
475 // Are either value a tagged smi.
476 Condition CheckEitherSmi(Register first,
478 Register scratch = kScratchRegister);
480 // Is the value the minimum smi value (since we are using
481 // two's complement numbers, negating the value is known to yield
483 Condition CheckIsMinSmi(Register src);
485 // Checks whether an 32-bit integer value is a valid for conversion
487 Condition CheckInteger32ValidSmiValue(Register src);
489 // Checks whether an 32-bit unsigned integer value is a valid for
490 // conversion to a smi.
491 Condition CheckUInteger32ValidSmiValue(Register src);
493 // Check whether src is a Smi, and set dst to zero if it is a smi,
494 // and to one if it isn't.
495 void CheckSmiToIndicator(Register dst, Register src);
496 void CheckSmiToIndicator(Register dst, const Operand& src);
498 // Test-and-jump functions. Typically combines a check function
499 // above with a conditional jump.
501 // Jump if the value can be represented by a smi.
502 void JumpIfValidSmiValue(Register src, Label* on_valid,
503 Label::Distance near_jump = Label::kFar);
505 // Jump if the value cannot be represented by a smi.
506 void JumpIfNotValidSmiValue(Register src, Label* on_invalid,
507 Label::Distance near_jump = Label::kFar);
509 // Jump if the unsigned integer value can be represented by a smi.
510 void JumpIfUIntValidSmiValue(Register src, Label* on_valid,
511 Label::Distance near_jump = Label::kFar);
513 // Jump if the unsigned integer value cannot be represented by a smi.
514 void JumpIfUIntNotValidSmiValue(Register src, Label* on_invalid,
515 Label::Distance near_jump = Label::kFar);
517 // Jump to label if the value is a tagged smi.
518 void JumpIfSmi(Register src,
520 Label::Distance near_jump = Label::kFar);
522 // Jump to label if the value is not a tagged smi.
523 void JumpIfNotSmi(Register src,
525 Label::Distance near_jump = Label::kFar);
527 // Jump to label if the value is not a non-negative tagged smi.
528 void JumpUnlessNonNegativeSmi(Register src,
530 Label::Distance near_jump = Label::kFar);
532 // Jump to label if the value, which must be a tagged smi, has value equal
534 void JumpIfSmiEqualsConstant(Register src,
537 Label::Distance near_jump = Label::kFar);
539 // Jump if either or both register are not smi values.
540 void JumpIfNotBothSmi(Register src1,
542 Label* on_not_both_smi,
543 Label::Distance near_jump = Label::kFar);
545 // Jump if either or both register are not non-negative smi values.
546 void JumpUnlessBothNonNegativeSmi(Register src1, Register src2,
547 Label* on_not_both_smi,
548 Label::Distance near_jump = Label::kFar);
550 // Operations on tagged smi values.
552 // Smis represent a subset of integers. The subset is always equivalent to
553 // a two's complement interpretation of a fixed number of bits.
555 // Add an integer constant to a tagged smi, giving a tagged smi as result.
556 // No overflow testing on the result is done.
557 void SmiAddConstant(Register dst, Register src, Smi* constant);
559 // Add an integer constant to a tagged smi, giving a tagged smi as result.
560 // No overflow testing on the result is done.
561 void SmiAddConstant(const Operand& dst, Smi* constant);
563 // Add an integer constant to a tagged smi, giving a tagged smi as result,
564 // or jumping to a label if the result cannot be represented by a smi.
565 void SmiAddConstant(Register dst,
568 SmiOperationExecutionMode mode,
569 Label* bailout_label,
570 Label::Distance near_jump = Label::kFar);
572 // Subtract an integer constant from a tagged smi, giving a tagged smi as
573 // result. No testing on the result is done. Sets the N and Z flags
574 // based on the value of the resulting integer.
575 void SmiSubConstant(Register dst, Register src, Smi* constant);
577 // Subtract an integer constant from a tagged smi, giving a tagged smi as
578 // result, or jumping to a label if the result cannot be represented by a smi.
579 void SmiSubConstant(Register dst,
582 SmiOperationExecutionMode mode,
583 Label* bailout_label,
584 Label::Distance near_jump = Label::kFar);
586 // Negating a smi can give a negative zero or too large positive value.
587 // NOTICE: This operation jumps on success, not failure!
588 void SmiNeg(Register dst,
590 Label* on_smi_result,
591 Label::Distance near_jump = Label::kFar);
593 // Adds smi values and return the result as a smi.
594 // If dst is src1, then src1 will be destroyed if the operation is
595 // successful, otherwise kept intact.
596 void SmiAdd(Register dst,
599 Label* on_not_smi_result,
600 Label::Distance near_jump = Label::kFar);
601 void SmiAdd(Register dst,
604 Label* on_not_smi_result,
605 Label::Distance near_jump = Label::kFar);
607 void SmiAdd(Register dst,
611 // Subtracts smi values and return the result as a smi.
612 // If dst is src1, then src1 will be destroyed if the operation is
613 // successful, otherwise kept intact.
614 void SmiSub(Register dst,
617 Label* on_not_smi_result,
618 Label::Distance near_jump = Label::kFar);
619 void SmiSub(Register dst,
622 Label* on_not_smi_result,
623 Label::Distance near_jump = Label::kFar);
625 void SmiSub(Register dst,
629 void SmiSub(Register dst,
631 const Operand& src2);
633 // Multiplies smi values and return the result as a smi,
635 // If dst is src1, then src1 will be destroyed, even if
636 // the operation is unsuccessful.
637 void SmiMul(Register dst,
640 Label* on_not_smi_result,
641 Label::Distance near_jump = Label::kFar);
643 // Divides one smi by another and returns the quotient.
644 // Clobbers rax and rdx registers.
645 void SmiDiv(Register dst,
648 Label* on_not_smi_result,
649 Label::Distance near_jump = Label::kFar);
651 // Divides one smi by another and returns the remainder.
652 // Clobbers rax and rdx registers.
653 void SmiMod(Register dst,
656 Label* on_not_smi_result,
657 Label::Distance near_jump = Label::kFar);
659 // Bitwise operations.
660 void SmiNot(Register dst, Register src);
661 void SmiAnd(Register dst, Register src1, Register src2);
662 void SmiOr(Register dst, Register src1, Register src2);
663 void SmiXor(Register dst, Register src1, Register src2);
664 void SmiAndConstant(Register dst, Register src1, Smi* constant);
665 void SmiOrConstant(Register dst, Register src1, Smi* constant);
666 void SmiXorConstant(Register dst, Register src1, Smi* constant);
668 void SmiShiftLeftConstant(Register dst,
671 Label* on_not_smi_result = NULL,
672 Label::Distance near_jump = Label::kFar);
673 void SmiShiftLogicalRightConstant(Register dst,
676 Label* on_not_smi_result,
677 Label::Distance near_jump = Label::kFar);
678 void SmiShiftArithmeticRightConstant(Register dst,
682 // Shifts a smi value to the left, and returns the result if that is a smi.
683 // Uses and clobbers rcx, so dst may not be rcx.
684 void SmiShiftLeft(Register dst,
687 Label* on_not_smi_result = NULL,
688 Label::Distance near_jump = Label::kFar);
689 // Shifts a smi value to the right, shifting in zero bits at the top, and
690 // returns the unsigned intepretation of the result if that is a smi.
691 // Uses and clobbers rcx, so dst may not be rcx.
692 void SmiShiftLogicalRight(Register dst,
695 Label* on_not_smi_result,
696 Label::Distance near_jump = Label::kFar);
697 // Shifts a smi value to the right, sign extending the top, and
698 // returns the signed intepretation of the result. That will always
699 // be a valid smi value, since it's numerically smaller than the
701 // Uses and clobbers rcx, so dst may not be rcx.
702 void SmiShiftArithmeticRight(Register dst,
706 // Specialized operations
708 // Select the non-smi register of two registers where exactly one is a
709 // smi. If neither are smis, jump to the failure label.
710 void SelectNonSmi(Register dst,
714 Label::Distance near_jump = Label::kFar);
716 // Converts, if necessary, a smi to a combination of number and
717 // multiplier to be used as a scaled index.
718 // The src register contains a *positive* smi value. The shift is the
719 // power of two to multiply the index value by (e.g.
720 // to index by smi-value * kPointerSize, pass the smi and kPointerSizeLog2).
721 // The returned index register may be either src or dst, depending
722 // on what is most efficient. If src and dst are different registers,
723 // src is always unchanged.
724 SmiIndex SmiToIndex(Register dst, Register src, int shift);
726 // Converts a positive smi to a negative index.
727 SmiIndex SmiToNegativeIndex(Register dst, Register src, int shift);
729 // Add the value of a smi in memory to an int32 register.
730 // Sets flags as a normal add.
731 void AddSmiField(Register dst, const Operand& src);
733 // Basic Smi operations.
734 void Move(Register dst, Smi* source) {
735 LoadSmiConstant(dst, source);
738 void Move(const Operand& dst, Smi* source) {
739 Register constant = GetSmiConstant(source);
745 // Save away a raw integer with pointer size on the stack as two integers
746 // masquerading as smis so that the garbage collector skips visiting them.
747 void PushRegisterAsTwoSmis(Register src, Register scratch = kScratchRegister);
748 // Reconstruct a raw integer with pointer size from two integers masquerading
749 // as smis on the top of stack.
750 void PopRegisterAsTwoSmis(Register dst, Register scratch = kScratchRegister);
752 void Test(const Operand& dst, Smi* source);
755 // ---------------------------------------------------------------------------
758 // Generate code to do a lookup in the number string cache. If the number in
759 // the register object is found in the cache the generated code falls through
760 // with the result in the result register. The object and the result register
761 // can be the same. If the number is not found in the cache the code jumps to
762 // the label not_found with only the content of register object unchanged.
763 void LookupNumberStringCache(Register object,
769 // If object is a string, its map is loaded into object_map.
770 void JumpIfNotString(Register object,
773 Label::Distance near_jump = Label::kFar);
776 void JumpIfNotBothSequentialAsciiStrings(
777 Register first_object,
778 Register second_object,
781 Label* on_not_both_flat_ascii,
782 Label::Distance near_jump = Label::kFar);
784 // Check whether the instance type represents a flat ASCII string. Jump to the
785 // label if not. If the instance type can be scratched specify same register
786 // for both instance type and scratch.
787 void JumpIfInstanceTypeIsNotSequentialAscii(
788 Register instance_type,
790 Label*on_not_flat_ascii_string,
791 Label::Distance near_jump = Label::kFar);
793 void JumpIfBothInstanceTypesAreNotSequentialAscii(
794 Register first_object_instance_type,
795 Register second_object_instance_type,
799 Label::Distance near_jump = Label::kFar);
801 void EmitSeqStringSetCharCheck(Register string,
804 uint32_t encoding_mask);
806 // Checks if the given register or operand is a unique name
807 void JumpIfNotUniqueName(Register reg, Label* not_unique_name,
808 Label::Distance distance = Label::kFar);
809 void JumpIfNotUniqueName(Operand operand, Label* not_unique_name,
810 Label::Distance distance = Label::kFar);
812 // ---------------------------------------------------------------------------
813 // Macro instructions.
815 // Load/store with specific representation.
816 void Load(Register dst, const Operand& src, Representation r);
817 void Store(const Operand& dst, Register src, Representation r);
819 // Load a register with a long value as efficiently as possible.
820 void Set(Register dst, int64_t x);
821 void Set(const Operand& dst, intptr_t x);
823 // cvtsi2sd instruction only writes to the low 64-bit of dst register, which
824 // hinders register renaming and makes dependence chains longer. So we use
825 // xorps to clear the dst register before cvtsi2sd to solve this issue.
826 void Cvtlsi2sd(XMMRegister dst, Register src);
827 void Cvtlsi2sd(XMMRegister dst, const Operand& src);
829 // Move if the registers are not identical.
830 void Move(Register target, Register source);
832 // TestBit and Load SharedFunctionInfo special field.
833 void TestBitSharedFunctionInfoSpecialField(Register base,
836 void LoadSharedFunctionInfoSpecialField(Register dst,
841 void Move(Register dst, Handle<Object> source);
842 void Move(const Operand& dst, Handle<Object> source);
843 void Cmp(Register dst, Handle<Object> source);
844 void Cmp(const Operand& dst, Handle<Object> source);
845 void Cmp(Register dst, Smi* src);
846 void Cmp(const Operand& dst, Smi* src);
847 void Push(Handle<Object> source);
849 // Load a heap object and handle the case of new-space objects by
850 // indirecting via a global cell.
851 void MoveHeapObject(Register result, Handle<Object> object);
853 // Load a global cell into a register.
854 void LoadGlobalCell(Register dst, Handle<Cell> cell);
856 // Emit code to discard a non-negative number of pointer-sized elements
857 // from the stack, clobbering only the rsp register.
858 void Drop(int stack_elements);
859 // Emit code to discard a positive number of pointer-sized elements
860 // from the stack under the return address which remains on the top,
861 // clobbering the rsp register.
862 void DropUnderReturnAddress(int stack_elements,
863 Register scratch = kScratchRegister);
865 void Call(Label* target) { call(target); }
866 void Push(Register src);
867 void Push(const Operand& src);
868 void PushQuad(const Operand& src);
869 void Push(Immediate value);
870 void PushImm32(int32_t imm32);
871 void Pop(Register dst);
872 void Pop(const Operand& dst);
873 void PopQuad(const Operand& dst);
874 void PushReturnAddressFrom(Register src) { pushq(src); }
875 void PopReturnAddressTo(Register dst) { popq(dst); }
876 void Move(Register dst, ExternalReference ext) {
877 movp(dst, reinterpret_cast<void*>(ext.address()),
878 RelocInfo::EXTERNAL_REFERENCE);
881 // Loads a pointer into a register with a relocation mode.
882 void Move(Register dst, void* ptr, RelocInfo::Mode rmode) {
883 // This method must not be used with heap object references. The stored
884 // address is not GC safe. Use the handle version instead.
885 DCHECK(rmode > RelocInfo::LAST_GCED_ENUM);
886 movp(dst, ptr, rmode);
889 void Move(Register dst, Handle<Object> value, RelocInfo::Mode rmode) {
890 AllowDeferredHandleDereference using_raw_address;
891 DCHECK(!RelocInfo::IsNone(rmode));
892 DCHECK(value->IsHeapObject());
893 DCHECK(!isolate()->heap()->InNewSpace(*value));
894 movp(dst, reinterpret_cast<void*>(value.location()), rmode);
898 void Jump(Address destination, RelocInfo::Mode rmode);
899 void Jump(ExternalReference ext);
900 void Jump(const Operand& op);
901 void Jump(Handle<Code> code_object, RelocInfo::Mode rmode);
903 void Call(Address destination, RelocInfo::Mode rmode);
904 void Call(ExternalReference ext);
905 void Call(const Operand& op);
906 void Call(Handle<Code> code_object,
907 RelocInfo::Mode rmode,
908 TypeFeedbackId ast_id = TypeFeedbackId::None());
910 // The size of the code generated for different call instructions.
911 int CallSize(Address destination) {
912 return kCallSequenceLength;
914 int CallSize(ExternalReference ext);
915 int CallSize(Handle<Code> code_object) {
916 // Code calls use 32-bit relative addressing.
917 return kShortCallInstructionLength;
919 int CallSize(Register target) {
920 // Opcode: REX_opt FF /2 m64
921 return (target.high_bit() != 0) ? 3 : 2;
923 int CallSize(const Operand& target) {
924 // Opcode: REX_opt FF /2 m64
925 return (target.requires_rex() ? 2 : 1) + target.operand_size();
928 // Emit call to the code we are currently generating.
930 Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
931 Call(self, RelocInfo::CODE_TARGET);
934 // Non-x64 instructions.
935 // Push/pop all general purpose registers.
936 // Does not push rsp/rbp nor any of the assembler's special purpose registers
937 // (kScratchRegister, kSmiConstantRegister, kRootRegister).
940 // Sets the stack as after performing Popad, without actually loading the
944 // Compare object type for heap object.
945 // Always use unsigned comparisons: above and below, not less and greater.
946 // Incoming register is heap_object and outgoing register is map.
947 // They may be the same register, and may be kScratchRegister.
948 void CmpObjectType(Register heap_object, InstanceType type, Register map);
950 // Compare instance type for map.
951 // Always use unsigned comparisons: above and below, not less and greater.
952 void CmpInstanceType(Register map, InstanceType type);
954 // Check if a map for a JSObject indicates that the object has fast elements.
955 // Jump to the specified label if it does not.
956 void CheckFastElements(Register map,
958 Label::Distance distance = Label::kFar);
960 // Check if a map for a JSObject indicates that the object can have both smi
961 // and HeapObject elements. Jump to the specified label if it does not.
962 void CheckFastObjectElements(Register map,
964 Label::Distance distance = Label::kFar);
966 // Check if a map for a JSObject indicates that the object has fast smi only
967 // elements. Jump to the specified label if it does not.
968 void CheckFastSmiElements(Register map,
970 Label::Distance distance = Label::kFar);
972 // Check to see if maybe_number can be stored as a double in
973 // FastDoubleElements. If it can, store it at the index specified by index in
974 // the FastDoubleElements array elements, otherwise jump to fail. Note that
975 // index must not be smi-tagged.
976 void StoreNumberToDoubleElements(Register maybe_number,
979 XMMRegister xmm_scratch,
981 int elements_offset = 0);
983 // Compare an object's map with the specified map.
984 void CompareMap(Register obj, Handle<Map> map);
986 // Check if the map of an object is equal to a specified map and branch to
987 // label if not. Skip the smi check if not required (object is known to be a
988 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
989 // against maps that are ElementsKind transition maps of the specified map.
990 void CheckMap(Register obj,
993 SmiCheckType smi_check_type);
995 // Check if the map of an object is equal to a specified map and branch to a
996 // specified target if equal. Skip the smi check if not required (object is
997 // known to be a heap object)
998 void DispatchMap(Register obj,
1001 Handle<Code> success,
1002 SmiCheckType smi_check_type);
1004 // Check if the object in register heap_object is a string. Afterwards the
1005 // register map contains the object map and the register instance_type
1006 // contains the instance_type. The registers map and instance_type can be the
1007 // same in which case it contains the instance type afterwards. Either of the
1008 // registers map and instance_type can be the same as heap_object.
1009 Condition IsObjectStringType(Register heap_object,
1011 Register instance_type);
1013 // Check if the object in register heap_object is a name. Afterwards the
1014 // register map contains the object map and the register instance_type
1015 // contains the instance_type. The registers map and instance_type can be the
1016 // same in which case it contains the instance type afterwards. Either of the
1017 // registers map and instance_type can be the same as heap_object.
1018 Condition IsObjectNameType(Register heap_object,
1020 Register instance_type);
1022 // FCmp compares and pops the two values on top of the FPU stack.
1023 // The flag results are similar to integer cmp, but requires unsigned
1024 // jcc instructions (je, ja, jae, jb, jbe, je, and jz).
1027 void ClampUint8(Register reg);
1029 void ClampDoubleToUint8(XMMRegister input_reg,
1030 XMMRegister temp_xmm_reg,
1031 Register result_reg);
1033 void SlowTruncateToI(Register result_reg, Register input_reg,
1034 int offset = HeapNumber::kValueOffset - kHeapObjectTag);
1036 void TruncateHeapNumberToI(Register result_reg, Register input_reg);
1037 void TruncateDoubleToI(Register result_reg, XMMRegister input_reg);
1039 void DoubleToI(Register result_reg, XMMRegister input_reg,
1040 XMMRegister scratch, MinusZeroMode minus_zero_mode,
1041 Label* conversion_failed, Label::Distance dst = Label::kFar);
1043 void TaggedToI(Register result_reg, Register input_reg, XMMRegister temp,
1044 MinusZeroMode minus_zero_mode, Label* lost_precision,
1045 Label::Distance dst = Label::kFar);
1047 void LoadUint32(XMMRegister dst, Register src);
1049 void LoadInstanceDescriptors(Register map, Register descriptors);
1050 void EnumLength(Register dst, Register map);
1051 void NumberOfOwnDescriptors(Register dst, Register map);
1053 template<typename Field>
1054 void DecodeField(Register reg) {
1055 static const int shift = Field::kShift;
1056 static const int mask = Field::kMask >> Field::kShift;
1058 shrp(reg, Immediate(shift));
1060 andp(reg, Immediate(mask));
1063 template<typename Field>
1064 void DecodeFieldToSmi(Register reg) {
1065 if (SmiValuesAre32Bits()) {
1066 andp(reg, Immediate(Field::kMask));
1067 shlp(reg, Immediate(kSmiShift - Field::kShift));
1069 static const int shift = Field::kShift;
1070 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize;
1071 DCHECK(SmiValuesAre31Bits());
1072 DCHECK(kSmiShift == kSmiTagSize);
1073 DCHECK((mask & 0x80000000u) == 0);
1074 if (shift < kSmiShift) {
1075 shlp(reg, Immediate(kSmiShift - shift));
1076 } else if (shift > kSmiShift) {
1077 sarp(reg, Immediate(shift - kSmiShift));
1079 andp(reg, Immediate(mask));
1083 // Abort execution if argument is not a number, enabled via --debug-code.
1084 void AssertNumber(Register object);
1086 // Abort execution if argument is a smi, enabled via --debug-code.
1087 void AssertNotSmi(Register object);
1089 // Abort execution if argument is not a smi, enabled via --debug-code.
1090 void AssertSmi(Register object);
1091 void AssertSmi(const Operand& object);
1093 // Abort execution if a 64 bit register containing a 32 bit payload does not
1094 // have zeros in the top 32 bits, enabled via --debug-code.
1095 void AssertZeroExtended(Register reg);
1097 // Abort execution if argument is not a string, enabled via --debug-code.
1098 void AssertString(Register object);
1100 // Abort execution if argument is not a name, enabled via --debug-code.
1101 void AssertName(Register object);
1103 // Abort execution if argument is not undefined or an AllocationSite, enabled
1104 // via --debug-code.
1105 void AssertUndefinedOrAllocationSite(Register object);
1107 // Abort execution if argument is not the root value with the given index,
1108 // enabled via --debug-code.
1109 void AssertRootValue(Register src,
1110 Heap::RootListIndex root_value_index,
1111 BailoutReason reason);
1113 // ---------------------------------------------------------------------------
1114 // Exception handling
1116 // Push a new try handler and link it into try handler chain.
1117 void PushTryHandler(StackHandler::Kind kind, int handler_index);
1119 // Unlink the stack handler on top of the stack from the try handler chain.
1120 void PopTryHandler();
1122 // Activate the top handler in the try hander chain and pass the
1124 void Throw(Register value);
1126 // Propagate an uncatchable exception out of the current JS stack.
1127 void ThrowUncatchable(Register value);
1129 // ---------------------------------------------------------------------------
1130 // Inline caching support
1132 // Generate code for checking access rights - used for security checks
1133 // on access to global objects across environments. The holder register
1134 // is left untouched, but the scratch register and kScratchRegister,
1135 // which must be different, are clobbered.
1136 void CheckAccessGlobalProxy(Register holder_reg,
1140 void GetNumberHash(Register r0, Register scratch);
1142 void LoadFromNumberDictionary(Label* miss,
1151 // ---------------------------------------------------------------------------
1152 // Allocation support
1154 // Allocate an object in new space or old pointer space. If the given space
1155 // is exhausted control continues at the gc_required label. The allocated
1156 // object is returned in result and end of the new object is returned in
1157 // result_end. The register scratch can be passed as no_reg in which case
1158 // an additional object reference will be added to the reloc info. The
1159 // returned pointers in result and result_end have not yet been tagged as
1160 // heap objects. If result_contains_top_on_entry is true the content of
1161 // result is known to be the allocation top on entry (could be result_end
1162 // from a previous call). If result_contains_top_on_entry is true scratch
1163 // should be no_reg as it is never used.
1164 void Allocate(int object_size,
1166 Register result_end,
1169 AllocationFlags flags);
1171 void Allocate(int header_size,
1172 ScaleFactor element_size,
1173 Register element_count,
1175 Register result_end,
1178 AllocationFlags flags);
1180 void Allocate(Register object_size,
1182 Register result_end,
1185 AllocationFlags flags);
1187 // Undo allocation in new space. The object passed and objects allocated after
1188 // it will no longer be allocated. Make sure that no pointers are left to the
1189 // object(s) no longer allocated as they would be invalid when allocation is
1191 void UndoAllocationInNewSpace(Register object);
1193 // Allocate a heap number in new space with undefined value. Returns
1194 // tagged pointer in result register, or jumps to gc_required if new
1196 void AllocateHeapNumber(Register result,
1199 MutableMode mode = IMMUTABLE);
1201 // Allocate a sequential string. All the header fields of the string object
1203 void AllocateTwoByteString(Register result,
1208 Label* gc_required);
1209 void AllocateAsciiString(Register result,
1214 Label* gc_required);
1216 // Allocate a raw cons string object. Only the map field of the result is
1218 void AllocateTwoByteConsString(Register result,
1221 Label* gc_required);
1222 void AllocateAsciiConsString(Register result,
1225 Label* gc_required);
1227 // Allocate a raw sliced string object. Only the map field of the result is
1229 void AllocateTwoByteSlicedString(Register result,
1232 Label* gc_required);
1233 void AllocateAsciiSlicedString(Register result,
1236 Label* gc_required);
1238 // ---------------------------------------------------------------------------
1239 // Support functions.
1241 // Check if result is zero and op is negative.
1242 void NegativeZeroTest(Register result, Register op, Label* then_label);
1244 // Check if result is zero and op is negative in code using jump targets.
1245 void NegativeZeroTest(CodeGenerator* cgen,
1248 JumpTarget* then_target);
1250 // Check if result is zero and any of op1 and op2 are negative.
1251 // Register scratch is destroyed, and it must be different from op2.
1252 void NegativeZeroTest(Register result, Register op1, Register op2,
1253 Register scratch, Label* then_label);
1255 // Try to get function prototype of a function and puts the value in
1256 // the result register. Checks that the function really is a
1257 // function and jumps to the miss label if the fast checks fail. The
1258 // function register will be untouched; the other register may be
1260 void TryGetFunctionPrototype(Register function,
1263 bool miss_on_bound_function = false);
1265 // Picks out an array index from the hash field.
1267 // hash - holds the index's hash. Clobbered.
1268 // index - holds the overwritten index on exit.
1269 void IndexFromHash(Register hash, Register index);
1271 // Find the function context up the context chain.
1272 void LoadContext(Register dst, int context_chain_length);
1274 // Conditionally load the cached Array transitioned map of type
1275 // transitioned_kind from the native context if the map in register
1276 // map_in_out is the cached Array map in the native context of
1278 void LoadTransitionedArrayMapConditional(
1279 ElementsKind expected_kind,
1280 ElementsKind transitioned_kind,
1281 Register map_in_out,
1283 Label* no_map_match);
1285 // Load the global function with the given index.
1286 void LoadGlobalFunction(int index, Register function);
1288 // Load the initial map from the global function. The registers
1289 // function and map can be the same.
1290 void LoadGlobalFunctionInitialMap(Register function, Register map);
1292 // ---------------------------------------------------------------------------
1295 // Call a code stub.
1296 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None());
1298 // Tail call a code stub (jump).
1299 void TailCallStub(CodeStub* stub);
1301 // Return from a code stub after popping its arguments.
1302 void StubReturn(int argc);
1304 // Call a runtime routine.
1305 void CallRuntime(const Runtime::Function* f,
1307 SaveFPRegsMode save_doubles = kDontSaveFPRegs);
1309 // Call a runtime function and save the value of XMM registers.
1310 void CallRuntimeSaveDoubles(Runtime::FunctionId id) {
1311 const Runtime::Function* function = Runtime::FunctionForId(id);
1312 CallRuntime(function, function->nargs, kSaveFPRegs);
1315 // Convenience function: Same as above, but takes the fid instead.
1316 void CallRuntime(Runtime::FunctionId id,
1318 SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
1319 CallRuntime(Runtime::FunctionForId(id), num_arguments, save_doubles);
1322 // Convenience function: call an external reference.
1323 void CallExternalReference(const ExternalReference& ext,
1326 // Tail call of a runtime routine (jump).
1327 // Like JumpToExternalReference, but also takes care of passing the number
1329 void TailCallExternalReference(const ExternalReference& ext,
1333 // Convenience function: tail call a runtime routine (jump).
1334 void TailCallRuntime(Runtime::FunctionId fid,
1338 // Jump to a runtime routine.
1339 void JumpToExternalReference(const ExternalReference& ext, int result_size);
1341 // Prepares stack to put arguments (aligns and so on). WIN64 calling
1342 // convention requires to put the pointer to the return value slot into
1343 // rcx (rcx must be preserverd until CallApiFunctionAndReturn). Saves
1344 // context (rsi). Clobbers rax. Allocates arg_stack_space * kPointerSize
1345 // inside the exit frame (not GCed) accessible via StackSpaceOperand.
1346 void PrepareCallApiFunction(int arg_stack_space);
1348 // Calls an API function. Allocates HandleScope, extracts returned value
1349 // from handle and propagates exceptions. Clobbers r14, r15, rbx and
1350 // caller-save registers. Restores context. On return removes
1351 // stack_space * kPointerSize (GCed).
1352 void CallApiFunctionAndReturn(Register function_address,
1353 ExternalReference thunk_ref,
1354 Register thunk_last_arg,
1356 Operand return_value_operand,
1357 Operand* context_restore_operand);
1359 // Before calling a C-function from generated code, align arguments on stack.
1360 // After aligning the frame, arguments must be stored in rsp[0], rsp[8],
1361 // etc., not pushed. The argument count assumes all arguments are word sized.
1362 // The number of slots reserved for arguments depends on platform. On Windows
1363 // stack slots are reserved for the arguments passed in registers. On other
1364 // platforms stack slots are only reserved for the arguments actually passed
1366 void PrepareCallCFunction(int num_arguments);
1368 // Calls a C function and cleans up the space for arguments allocated
1369 // by PrepareCallCFunction. The called function is not allowed to trigger a
1370 // garbage collection, since that might move the code and invalidate the
1371 // return address (unless this is somehow accounted for by the called
1373 void CallCFunction(ExternalReference function, int num_arguments);
1374 void CallCFunction(Register function, int num_arguments);
1376 // Calculate the number of stack slots to reserve for arguments when calling a
1378 int ArgumentStackSlotsForCFunctionCall(int num_arguments);
1380 // ---------------------------------------------------------------------------
1385 // Return and drop arguments from stack, where the number of arguments
1386 // may be bigger than 2^16 - 1. Requires a scratch register.
1387 void Ret(int bytes_dropped, Register scratch);
1389 Handle<Object> CodeObject() {
1390 DCHECK(!code_object_.is_null());
1391 return code_object_;
1394 // Copy length bytes from source to destination.
1395 // Uses scratch register internally (if you have a low-eight register
1396 // free, do use it, otherwise kScratchRegister will be used).
1397 // The min_length is a minimum limit on the value that length will have.
1398 // The algorithm has some special cases that might be omitted if the string
1399 // is known to always be long.
1400 void CopyBytes(Register destination,
1404 Register scratch = kScratchRegister);
1406 // Initialize fields with filler values. Fields starting at |start_offset|
1407 // not including end_offset are overwritten with the value in |filler|. At
1408 // the end the loop, |start_offset| takes the value of |end_offset|.
1409 void InitializeFieldsWithFiller(Register start_offset,
1410 Register end_offset,
1414 // Emit code for a truncating division by a constant. The dividend register is
1415 // unchanged, the result is in rdx, and rax gets clobbered.
1416 void TruncatingDiv(Register dividend, int32_t divisor);
1418 // ---------------------------------------------------------------------------
1419 // StatsCounter support
1421 void SetCounter(StatsCounter* counter, int value);
1422 void IncrementCounter(StatsCounter* counter, int value);
1423 void DecrementCounter(StatsCounter* counter, int value);
1426 // ---------------------------------------------------------------------------
1429 // Calls Abort(msg) if the condition cc is not satisfied.
1430 // Use --debug_code to enable.
1431 void Assert(Condition cc, BailoutReason reason);
1433 void AssertFastElements(Register elements);
1435 // Like Assert(), but always enabled.
1436 void Check(Condition cc, BailoutReason reason);
1438 // Print a message to stdout and abort execution.
1439 void Abort(BailoutReason msg);
1441 // Check that the stack is aligned.
1442 void CheckStackAlignment();
1444 // Verify restrictions about code generated in stubs.
1445 void set_generating_stub(bool value) { generating_stub_ = value; }
1446 bool generating_stub() { return generating_stub_; }
1447 void set_has_frame(bool value) { has_frame_ = value; }
1448 bool has_frame() { return has_frame_; }
1449 inline bool AllowThisStubCall(CodeStub* stub);
1451 static int SafepointRegisterStackIndex(Register reg) {
1452 return SafepointRegisterStackIndex(reg.code());
1455 // Activation support.
1456 void EnterFrame(StackFrame::Type type);
1457 void LeaveFrame(StackFrame::Type type);
1459 // Expects object in rax and returns map with validated enum cache
1460 // in rax. Assumes that any other register can be used as a scratch.
1461 void CheckEnumCache(Register null_value,
1462 Label* call_runtime);
1464 // AllocationMemento support. Arrays may have an associated
1465 // AllocationMemento object that can be checked for in order to pretransition
1467 // On entry, receiver_reg should point to the array object.
1468 // scratch_reg gets clobbered.
1469 // If allocation info is present, condition flags are set to equal.
1470 void TestJSArrayForAllocationMemento(Register receiver_reg,
1471 Register scratch_reg,
1472 Label* no_memento_found);
1474 void JumpIfJSArrayHasAllocationMemento(Register receiver_reg,
1475 Register scratch_reg,
1476 Label* memento_found) {
1477 Label no_memento_found;
1478 TestJSArrayForAllocationMemento(receiver_reg, scratch_reg,
1480 j(equal, memento_found);
1481 bind(&no_memento_found);
1484 // Jumps to found label if a prototype map has dictionary elements.
1485 void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0,
1486 Register scratch1, Label* found);
1489 // Order general registers are pushed by Pushad.
1490 // rax, rcx, rdx, rbx, rsi, rdi, r8, r9, r11, r14, r15.
1491 static const int kSafepointPushRegisterIndices[Register::kNumRegisters];
1492 static const int kNumSafepointSavedRegisters = 11;
1493 static const int kSmiShift = kSmiTagSize + kSmiShiftSize;
1495 bool generating_stub_;
1497 bool root_array_available_;
1499 // Returns a register holding the smi value. The register MUST NOT be
1500 // modified. It may be the "smi 1 constant" register.
1501 Register GetSmiConstant(Smi* value);
1503 int64_t RootRegisterDelta(ExternalReference other);
1505 // Moves the smi value to the destination register.
1506 void LoadSmiConstant(Register dst, Smi* value);
1508 // This handle will be patched with the code object on installation.
1509 Handle<Object> code_object_;
1511 // Helper functions for generating invokes.
1512 void InvokePrologue(const ParameterCount& expected,
1513 const ParameterCount& actual,
1514 Handle<Code> code_constant,
1515 Register code_register,
1517 bool* definitely_mismatches,
1519 Label::Distance near_jump = Label::kFar,
1520 const CallWrapper& call_wrapper = NullCallWrapper());
1522 void EnterExitFramePrologue(bool save_rax);
1524 // Allocates arg_stack_space * kPointerSize memory (not GCed) on the stack
1525 // accessible via StackSpaceOperand.
1526 void EnterExitFrameEpilogue(int arg_stack_space, bool save_doubles);
1528 void LeaveExitFrameEpilogue(bool restore_context);
1530 // Allocation support helpers.
1531 // Loads the top of new-space into the result register.
1532 // Otherwise the address of the new-space top is loaded into scratch (if
1533 // scratch is valid), and the new-space top is loaded into result.
1534 void LoadAllocationTopHelper(Register result,
1536 AllocationFlags flags);
1538 void MakeSureDoubleAlignedHelper(Register result,
1541 AllocationFlags flags);
1543 // Update allocation top with value in result_end register.
1544 // If scratch is valid, it contains the address of the allocation top.
1545 void UpdateAllocationTopHelper(Register result_end,
1547 AllocationFlags flags);
1549 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
1550 void InNewSpace(Register object,
1554 Label::Distance distance = Label::kFar);
1556 // Helper for finding the mark bits for an address. Afterwards, the
1557 // bitmap register points at the word with the mark bits and the mask
1558 // the position of the first bit. Uses rcx as scratch and leaves addr_reg
1560 inline void GetMarkBits(Register addr_reg,
1561 Register bitmap_reg,
1564 // Helper for throwing exceptions. Compute a handler address and jump to
1565 // it. See the implementation for register usage.
1566 void JumpToHandlerEntry();
1568 // Compute memory operands for safepoint stack slots.
1569 Operand SafepointRegisterSlot(Register reg);
1570 static int SafepointRegisterStackIndex(int reg_code) {
1571 return kNumSafepointRegisters - kSafepointPushRegisterIndices[reg_code] - 1;
1574 // Needs access to SafepointRegisterStackIndex for compiled frame
1576 friend class StandardFrame;
1580 // The code patcher is used to patch (typically) small parts of code e.g. for
1581 // debugging and other types of instrumentation. When using the code patcher
1582 // the exact number of bytes specified must be emitted. Is not legal to emit
1583 // relocation information. If any of these constraints are violated it causes
1587 CodePatcher(byte* address, int size);
1588 virtual ~CodePatcher();
1590 // Macro assembler to emit code.
1591 MacroAssembler* masm() { return &masm_; }
1594 byte* address_; // The address of the code being patched.
1595 int size_; // Number of bytes of the expected patch size.
1596 MacroAssembler masm_; // Macro assembler used to generate the code.
1600 // -----------------------------------------------------------------------------
1601 // Static helper functions.
1603 // Generate an Operand for loading a field from an object.
1604 inline Operand FieldOperand(Register object, int offset) {
1605 return Operand(object, offset - kHeapObjectTag);
1609 // Generate an Operand for loading an indexed field from an object.
1610 inline Operand FieldOperand(Register object,
1614 return Operand(object, index, scale, offset - kHeapObjectTag);
1618 inline Operand ContextOperand(Register context, int index) {
1619 return Operand(context, Context::SlotOffset(index));
1623 inline Operand GlobalObjectOperand() {
1624 return ContextOperand(rsi, Context::GLOBAL_OBJECT_INDEX);
1628 // Provides access to exit frame stack space (not GCed).
1629 inline Operand StackSpaceOperand(int index) {
1631 const int kShaddowSpace = 4;
1632 return Operand(rsp, (index + kShaddowSpace) * kPointerSize);
1634 return Operand(rsp, index * kPointerSize);
1639 inline Operand StackOperandForReturnAddress(int32_t disp) {
1640 return Operand(rsp, disp);
1644 #ifdef GENERATED_CODE_COVERAGE
1645 extern void LogGeneratedCodeCoverage(const char* file_line);
1646 #define CODE_COVERAGE_STRINGIFY(x) #x
1647 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
1648 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
1649 #define ACCESS_MASM(masm) { \
1650 Address x64_coverage_function = FUNCTION_ADDR(LogGeneratedCodeCoverage); \
1653 masm->Push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \
1654 masm->Call(x64_coverage_function, RelocInfo::EXTERNAL_REFERENCE); \
1661 #define ACCESS_MASM(masm) masm->
1664 } } // namespace v8::internal
1666 #endif // V8_X64_MACRO_ASSEMBLER_X64_H_