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_MIPS_MACRO_ASSEMBLER_MIPS_H_
6 #define V8_MIPS_MACRO_ASSEMBLER_MIPS_H_
8 #include "src/assembler.h"
9 #include "src/globals.h"
10 #include "src/mips/assembler-mips.h"
15 // Forward declaration.
18 // Reserved Register Usage Summary.
20 // Registers t8, t9, and at are reserved for use by the MacroAssembler.
22 // The programmer should know that the MacroAssembler may clobber these three,
23 // but won't touch other registers except in special cases.
25 // Per the MIPS ABI, register t9 must be used for indirect function call
26 // via 'jalr t9' or 'jr t9' instructions. This is relied upon by gcc when
27 // trying to update gp register for position-independent-code. Whenever
28 // MIPS generated code calls C code, it must be via t9 register.
31 // Flags used for LeaveExitFrame function.
32 enum LeaveExitFrameMode {
34 NO_EMIT_RETURN = false
37 // Flags used for AllocateHeapNumber
45 // Flags used for the ObjectToDoubleFPURegister function.
46 enum ObjectToDoubleFlags {
48 NO_OBJECT_TO_DOUBLE_FLAGS = 0,
49 // Object is known to be a non smi.
50 OBJECT_NOT_SMI = 1 << 0,
51 // Don't load NaNs or infinities, branch to the non number case instead.
52 AVOID_NANS_AND_INFINITIES = 1 << 1
55 // Allow programmer to use Branch Delay Slot of Branches, Jumps, Calls.
56 enum BranchDelaySlot {
61 // Flags used for the li macro-assembler function.
63 // If the constant value can be represented in just 16 bits, then
64 // optimize the li to use a single instruction, rather than lui/ori pair.
66 // Always use 2 instructions (lui/ori pair), even if the constant could
67 // be loaded with just one, so that this value is patchable later.
72 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
73 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
74 enum PointersToHereCheck {
75 kPointersToHereMaybeInteresting,
76 kPointersToHereAreAlwaysInteresting
78 enum RAStatus { kRAHasNotBeenSaved, kRAHasBeenSaved };
80 Register GetRegisterThatIsNotOneOf(Register reg1,
81 Register reg2 = no_reg,
82 Register reg3 = no_reg,
83 Register reg4 = no_reg,
84 Register reg5 = no_reg,
85 Register reg6 = no_reg);
87 bool AreAliased(Register reg1,
89 Register reg3 = no_reg,
90 Register reg4 = no_reg,
91 Register reg5 = no_reg,
92 Register reg6 = no_reg,
93 Register reg7 = no_reg,
94 Register reg8 = no_reg);
97 // -----------------------------------------------------------------------------
98 // Static helper functions.
100 inline MemOperand ContextOperand(Register context, int index) {
101 return MemOperand(context, Context::SlotOffset(index));
105 inline MemOperand GlobalObjectOperand() {
106 return ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX);
110 // Generate a MemOperand for loading a field from an object.
111 inline MemOperand FieldMemOperand(Register object, int offset) {
112 return MemOperand(object, offset - kHeapObjectTag);
116 // Generate a MemOperand for storing arguments 5..N on the stack
117 // when calling CallCFunction().
118 inline MemOperand CFunctionArgumentOperand(int index) {
119 DCHECK(index > kCArgSlotCount);
120 // Argument 5 takes the slot just past the four Arg-slots.
121 int offset = (index - 5) * kPointerSize + kCArgsSlotsSize;
122 return MemOperand(sp, offset);
126 // MacroAssembler implements a collection of frequently used macros.
127 class MacroAssembler: public Assembler {
129 // The isolate parameter can be NULL if the macro assembler should
130 // not use isolate-dependent functionality. In this case, it's the
131 // responsibility of the caller to never invoke such function on the
133 MacroAssembler(Isolate* isolate, void* buffer, int size);
136 #define COND_TYPED_ARGS Condition cond, Register r1, const Operand& r2
137 #define COND_ARGS cond, r1, r2
139 // Cases when relocation is not needed.
140 #define DECLARE_NORELOC_PROTOTYPE(Name, target_type) \
141 void Name(target_type target, BranchDelaySlot bd = PROTECT); \
142 inline void Name(BranchDelaySlot bd, target_type target) { \
145 void Name(target_type target, \
147 BranchDelaySlot bd = PROTECT); \
148 inline void Name(BranchDelaySlot bd, \
149 target_type target, \
151 Name(target, COND_ARGS, bd); \
154 #define DECLARE_BRANCH_PROTOTYPES(Name) \
155 DECLARE_NORELOC_PROTOTYPE(Name, Label*) \
156 DECLARE_NORELOC_PROTOTYPE(Name, int16_t)
158 DECLARE_BRANCH_PROTOTYPES(Branch)
159 DECLARE_BRANCH_PROTOTYPES(BranchAndLink)
160 DECLARE_BRANCH_PROTOTYPES(BranchShort)
162 #undef DECLARE_BRANCH_PROTOTYPES
163 #undef COND_TYPED_ARGS
167 // Jump, Call, and Ret pseudo instructions implementing inter-working.
168 #define COND_ARGS Condition cond = al, Register rs = zero_reg, \
169 const Operand& rt = Operand(zero_reg), BranchDelaySlot bd = PROTECT
171 void Jump(Register target, COND_ARGS);
172 void Jump(intptr_t target, RelocInfo::Mode rmode, COND_ARGS);
173 void Jump(Address target, RelocInfo::Mode rmode, COND_ARGS);
174 void Jump(Handle<Code> code, RelocInfo::Mode rmode, COND_ARGS);
175 static int CallSize(Register target, COND_ARGS);
176 void Call(Register target, COND_ARGS);
177 static int CallSize(Address target, RelocInfo::Mode rmode, COND_ARGS);
178 void Call(Address target, RelocInfo::Mode rmode, COND_ARGS);
179 int CallSize(Handle<Code> code,
180 RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
181 TypeFeedbackId ast_id = TypeFeedbackId::None(),
183 void Call(Handle<Code> code,
184 RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
185 TypeFeedbackId ast_id = TypeFeedbackId::None(),
188 inline void Ret(BranchDelaySlot bd, Condition cond = al,
189 Register rs = zero_reg, const Operand& rt = Operand(zero_reg)) {
190 Ret(cond, rs, rt, bd);
193 void Branch(Label* L,
196 Heap::RootListIndex index,
197 BranchDelaySlot bdslot = PROTECT);
201 // Emit code to discard a non-negative number of pointer-sized elements
202 // from the stack, clobbering only the sp register.
204 Condition cond = cc_always,
205 Register reg = no_reg,
206 const Operand& op = Operand(no_reg));
208 // Trivial case of DropAndRet that utilizes the delay slot and only emits
210 void DropAndRet(int drop);
212 void DropAndRet(int drop,
217 // Swap two registers. If the scratch register is omitted then a slightly
218 // less efficient form using xor instead of mov is emitted.
219 void Swap(Register reg1, Register reg2, Register scratch = no_reg);
221 void Call(Label* target);
223 inline void Move(Register dst, Register src) {
229 inline void Move(FPURegister dst, FPURegister src) {
235 inline void Move(Register dst_low, Register dst_high, FPURegister src) {
237 Mfhc1(dst_high, src);
240 inline void FmoveHigh(Register dst_high, FPURegister src) {
241 Mfhc1(dst_high, src);
244 inline void FmoveLow(Register dst_low, FPURegister src) {
248 inline void Move(FPURegister dst, Register src_low, Register src_high) {
250 Mthc1(src_high, dst);
254 void Move(FPURegister dst, double imm);
255 void Movz(Register rd, Register rs, Register rt);
256 void Movn(Register rd, Register rs, Register rt);
257 void Movt(Register rd, Register rs, uint16_t cc = 0);
258 void Movf(Register rd, Register rs, uint16_t cc = 0);
260 void Clz(Register rd, Register rs);
262 // Jump unconditionally to given label.
263 // We NEED a nop in the branch delay slot, as it used by v8, for example in
264 // CodeGenerator::ProcessDeferred().
265 // Currently the branch delay slot is filled by the MacroAssembler.
266 // Use rather b(Label) for code generation.
271 void Load(Register dst, const MemOperand& src, Representation r);
272 void Store(Register src, const MemOperand& dst, Representation r);
274 // Load an object from the root table.
275 void LoadRoot(Register destination,
276 Heap::RootListIndex index);
277 void LoadRoot(Register destination,
278 Heap::RootListIndex index,
279 Condition cond, Register src1, const Operand& src2);
281 // Store an object to the root table.
282 void StoreRoot(Register source,
283 Heap::RootListIndex index);
284 void StoreRoot(Register source,
285 Heap::RootListIndex index,
286 Condition cond, Register src1, const Operand& src2);
288 // ---------------------------------------------------------------------------
291 void IncrementalMarkingRecordWriteHelper(Register object,
295 enum RememberedSetFinalAction {
301 // Record in the remembered set the fact that we have a pointer to new space
302 // at the address pointed to by the addr register. Only works if addr is not
304 void RememberedSetHelper(Register object, // Used for debug code.
307 SaveFPRegsMode save_fp,
308 RememberedSetFinalAction and_then);
310 void CheckPageFlag(Register object,
314 Label* condition_met);
316 void CheckMapDeprecated(Handle<Map> map,
318 Label* if_deprecated);
320 // Check if object is in new space. Jumps if the object is not in new space.
321 // The register scratch can be object itself, but it will be clobbered.
322 void JumpIfNotInNewSpace(Register object,
325 InNewSpace(object, scratch, ne, branch);
328 // Check if object is in new space. Jumps if the object is in new space.
329 // The register scratch can be object itself, but scratch will be clobbered.
330 void JumpIfInNewSpace(Register object,
333 InNewSpace(object, scratch, eq, branch);
336 // Check if an object has a given incremental marking color.
337 void HasColor(Register object,
344 void JumpIfBlack(Register object,
349 // Checks the color of an object. If the object is already grey or black
350 // then we just fall through, since it is already live. If it is white and
351 // we can determine that it doesn't need to be scanned, then we just mark it
352 // black and fall through. For the rest we jump to the label so the
353 // incremental marker can fix its assumptions.
354 void EnsureNotWhite(Register object,
358 Label* object_is_white_and_not_data);
360 // Detects conservatively whether an object is data-only, i.e. it does need to
361 // be scanned by the garbage collector.
362 void JumpIfDataObject(Register value,
364 Label* not_data_object);
366 // Notify the garbage collector that we wrote a pointer into an object.
367 // |object| is the object being stored into, |value| is the object being
368 // stored. value and scratch registers are clobbered by the operation.
369 // The offset is the offset from the start of the object, not the offset from
370 // the tagged HeapObject pointer. For use with FieldOperand(reg, off).
371 void RecordWriteField(
377 SaveFPRegsMode save_fp,
378 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
379 SmiCheck smi_check = INLINE_SMI_CHECK,
380 PointersToHereCheck pointers_to_here_check_for_value =
381 kPointersToHereMaybeInteresting);
383 // As above, but the offset has the tag presubtracted. For use with
384 // MemOperand(reg, off).
385 inline void RecordWriteContextSlot(
391 SaveFPRegsMode save_fp,
392 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
393 SmiCheck smi_check = INLINE_SMI_CHECK,
394 PointersToHereCheck pointers_to_here_check_for_value =
395 kPointersToHereMaybeInteresting) {
396 RecordWriteField(context,
397 offset + kHeapObjectTag,
402 remembered_set_action,
404 pointers_to_here_check_for_value);
407 void RecordWriteForMap(
412 SaveFPRegsMode save_fp);
414 // For a given |object| notify the garbage collector that the slot |address|
415 // has been written. |value| is the object being stored. The value and
416 // address registers are clobbered by the operation.
422 SaveFPRegsMode save_fp,
423 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
424 SmiCheck smi_check = INLINE_SMI_CHECK,
425 PointersToHereCheck pointers_to_here_check_for_value =
426 kPointersToHereMaybeInteresting);
429 // ---------------------------------------------------------------------------
430 // Inline caching support.
432 // Generate code for checking access rights - used for security checks
433 // on access to global objects across environments. The holder register
434 // is left untouched, whereas both scratch registers are clobbered.
435 void CheckAccessGlobalProxy(Register holder_reg,
439 void GetNumberHash(Register reg0, Register scratch);
441 void LoadFromNumberDictionary(Label* miss,
450 inline void MarkCode(NopMarkerTypes type) {
454 // Check if the given instruction is a 'type' marker.
455 // i.e. check if it is a sll zero_reg, zero_reg, <type> (referenced as
456 // nop(type)). These instructions are generated to mark special location in
457 // the code, like some special IC code.
458 static inline bool IsMarkedCode(Instr instr, int type) {
459 DCHECK((FIRST_IC_MARKER <= type) && (type < LAST_CODE_MARKER));
460 return IsNop(instr, type);
464 static inline int GetCodeMarker(Instr instr) {
465 uint32_t opcode = ((instr & kOpcodeMask));
466 uint32_t rt = ((instr & kRtFieldMask) >> kRtShift);
467 uint32_t rs = ((instr & kRsFieldMask) >> kRsShift);
468 uint32_t sa = ((instr & kSaFieldMask) >> kSaShift);
470 // Return <n> if we have a sll zero_reg, zero_reg, n
472 bool sllzz = (opcode == SLL &&
473 rt == static_cast<uint32_t>(ToNumber(zero_reg)) &&
474 rs == static_cast<uint32_t>(ToNumber(zero_reg)));
476 (sllzz && FIRST_IC_MARKER <= sa && sa < LAST_CODE_MARKER) ? sa : -1;
477 DCHECK((type == -1) ||
478 ((FIRST_IC_MARKER <= type) && (type < LAST_CODE_MARKER)));
484 // ---------------------------------------------------------------------------
485 // Allocation support.
487 // Allocate an object in new space or old pointer space. The object_size is
488 // specified either in bytes or in words if the allocation flag SIZE_IN_WORDS
489 // is passed. If the space is exhausted control continues at the gc_required
490 // label. The allocated object is returned in result. If the flag
491 // tag_allocated_object is true the result is tagged as as a heap object.
492 // All registers are clobbered also when control continues at the gc_required
494 void Allocate(int object_size,
499 AllocationFlags flags);
501 void Allocate(Register object_size,
506 AllocationFlags flags);
508 // Undo allocation in new space. The object passed and objects allocated after
509 // it will no longer be allocated. The caller must make sure that no pointers
510 // are left to the object(s) no longer allocated as they would be invalid when
511 // allocation is undone.
512 void UndoAllocationInNewSpace(Register object, Register scratch);
515 void AllocateTwoByteString(Register result,
521 void AllocateOneByteString(Register result, Register length,
522 Register scratch1, Register scratch2,
523 Register scratch3, Label* gc_required);
524 void AllocateTwoByteConsString(Register result,
529 void AllocateOneByteConsString(Register result, Register length,
530 Register scratch1, Register scratch2,
532 void AllocateTwoByteSlicedString(Register result,
537 void AllocateOneByteSlicedString(Register result, Register length,
538 Register scratch1, Register scratch2,
541 // Allocates a heap number or jumps to the gc_required label if the young
542 // space is full and a scavenge is needed. All registers are clobbered also
543 // when control continues at the gc_required label.
544 void AllocateHeapNumber(Register result,
547 Register heap_number_map,
549 TaggingMode tagging_mode = TAG_RESULT,
550 MutableMode mode = IMMUTABLE);
551 void AllocateHeapNumberWithValue(Register result,
557 // ---------------------------------------------------------------------------
558 // Instruction macros.
560 #define DEFINE_INSTRUCTION(instr) \
561 void instr(Register rd, Register rs, const Operand& rt); \
562 void instr(Register rd, Register rs, Register rt) { \
563 instr(rd, rs, Operand(rt)); \
565 void instr(Register rs, Register rt, int32_t j) { \
566 instr(rs, rt, Operand(j)); \
569 #define DEFINE_INSTRUCTION2(instr) \
570 void instr(Register rs, const Operand& rt); \
571 void instr(Register rs, Register rt) { \
572 instr(rs, Operand(rt)); \
574 void instr(Register rs, int32_t j) { \
575 instr(rs, Operand(j)); \
578 #define DEFINE_INSTRUCTION3(instr) \
579 void instr(Register rd_hi, Register rd_lo, Register rs, const Operand& rt); \
580 void instr(Register rd_hi, Register rd_lo, Register rs, Register rt) { \
581 instr(rd_hi, rd_lo, rs, Operand(rt)); \
583 void instr(Register rd_hi, Register rd_lo, Register rs, int32_t j) { \
584 instr(rd_hi, rd_lo, rs, Operand(j)); \
587 DEFINE_INSTRUCTION(Addu);
588 DEFINE_INSTRUCTION(Subu);
589 DEFINE_INSTRUCTION(Mul);
590 DEFINE_INSTRUCTION(Div);
591 DEFINE_INSTRUCTION(Divu);
592 DEFINE_INSTRUCTION(Mod);
593 DEFINE_INSTRUCTION(Modu);
594 DEFINE_INSTRUCTION(Mulh);
595 DEFINE_INSTRUCTION2(Mult);
596 DEFINE_INSTRUCTION2(Multu);
597 DEFINE_INSTRUCTION2(Div);
598 DEFINE_INSTRUCTION2(Divu);
600 DEFINE_INSTRUCTION3(Div);
601 DEFINE_INSTRUCTION3(Mul);
603 DEFINE_INSTRUCTION(And);
604 DEFINE_INSTRUCTION(Or);
605 DEFINE_INSTRUCTION(Xor);
606 DEFINE_INSTRUCTION(Nor);
607 DEFINE_INSTRUCTION2(Neg);
609 DEFINE_INSTRUCTION(Slt);
610 DEFINE_INSTRUCTION(Sltu);
612 // MIPS32 R2 instruction macro.
613 DEFINE_INSTRUCTION(Ror);
615 #undef DEFINE_INSTRUCTION
616 #undef DEFINE_INSTRUCTION2
618 void Pref(int32_t hint, const MemOperand& rs);
621 // ---------------------------------------------------------------------------
622 // Pseudo-instructions.
624 void mov(Register rd, Register rt) { or_(rd, rt, zero_reg); }
626 void Ulw(Register rd, const MemOperand& rs);
627 void Usw(Register rd, const MemOperand& rs);
629 // Load int32 in the rd register.
630 void li(Register rd, Operand j, LiFlags mode = OPTIMIZE_SIZE);
631 inline void li(Register rd, int32_t j, LiFlags mode = OPTIMIZE_SIZE) {
632 li(rd, Operand(j), mode);
634 void li(Register dst, Handle<Object> value, LiFlags mode = OPTIMIZE_SIZE);
636 // Push multiple registers on the stack.
637 // Registers are saved in numerical order, with higher numbered registers
638 // saved in higher memory addresses.
639 void MultiPush(RegList regs);
640 void MultiPushReversed(RegList regs);
642 void MultiPushFPU(RegList regs);
643 void MultiPushReversedFPU(RegList regs);
645 void push(Register src) {
646 Addu(sp, sp, Operand(-kPointerSize));
647 sw(src, MemOperand(sp, 0));
649 void Push(Register src) { push(src); }
652 void Push(Handle<Object> handle);
653 void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); }
655 // Push two registers. Pushes leftmost register first (to highest address).
656 void Push(Register src1, Register src2) {
657 Subu(sp, sp, Operand(2 * kPointerSize));
658 sw(src1, MemOperand(sp, 1 * kPointerSize));
659 sw(src2, MemOperand(sp, 0 * kPointerSize));
662 // Push three registers. Pushes leftmost register first (to highest address).
663 void Push(Register src1, Register src2, Register src3) {
664 Subu(sp, sp, Operand(3 * kPointerSize));
665 sw(src1, MemOperand(sp, 2 * kPointerSize));
666 sw(src2, MemOperand(sp, 1 * kPointerSize));
667 sw(src3, MemOperand(sp, 0 * kPointerSize));
670 // Push four registers. Pushes leftmost register first (to highest address).
671 void Push(Register src1, Register src2, Register src3, Register src4) {
672 Subu(sp, sp, Operand(4 * kPointerSize));
673 sw(src1, MemOperand(sp, 3 * kPointerSize));
674 sw(src2, MemOperand(sp, 2 * kPointerSize));
675 sw(src3, MemOperand(sp, 1 * kPointerSize));
676 sw(src4, MemOperand(sp, 0 * kPointerSize));
679 void Push(Register src, Condition cond, Register tst1, Register tst2) {
680 // Since we don't have conditional execution we use a Branch.
681 Branch(3, cond, tst1, Operand(tst2));
682 Subu(sp, sp, Operand(kPointerSize));
683 sw(src, MemOperand(sp, 0));
686 // Pops multiple values from the stack and load them in the
687 // registers specified in regs. Pop order is the opposite as in MultiPush.
688 void MultiPop(RegList regs);
689 void MultiPopReversed(RegList regs);
691 void MultiPopFPU(RegList regs);
692 void MultiPopReversedFPU(RegList regs);
694 void pop(Register dst) {
695 lw(dst, MemOperand(sp, 0));
696 Addu(sp, sp, Operand(kPointerSize));
698 void Pop(Register dst) { pop(dst); }
700 // Pop two registers. Pops rightmost register first (from lower address).
701 void Pop(Register src1, Register src2) {
702 DCHECK(!src1.is(src2));
703 lw(src2, MemOperand(sp, 0 * kPointerSize));
704 lw(src1, MemOperand(sp, 1 * kPointerSize));
705 Addu(sp, sp, 2 * kPointerSize);
708 // Pop three registers. Pops rightmost register first (from lower address).
709 void Pop(Register src1, Register src2, Register src3) {
710 lw(src3, MemOperand(sp, 0 * kPointerSize));
711 lw(src2, MemOperand(sp, 1 * kPointerSize));
712 lw(src1, MemOperand(sp, 2 * kPointerSize));
713 Addu(sp, sp, 3 * kPointerSize);
716 void Pop(uint32_t count = 1) {
717 Addu(sp, sp, Operand(count * kPointerSize));
720 // Push and pop the registers that can hold pointers, as defined by the
721 // RegList constant kSafepointSavedRegisters.
722 void PushSafepointRegisters();
723 void PopSafepointRegisters();
724 // Store value in register src in the safepoint stack slot for
726 void StoreToSafepointRegisterSlot(Register src, Register dst);
727 // Load the value of the src register from its safepoint stack slot
728 // into register dst.
729 void LoadFromSafepointRegisterSlot(Register dst, Register src);
731 // Flush the I-cache from asm code. You should use CpuFeatures::FlushICache
733 // Does not handle errors.
734 void FlushICache(Register address, unsigned instructions);
736 // MIPS32 R2 instruction macro.
737 void Ins(Register rt, Register rs, uint16_t pos, uint16_t size);
738 void Ext(Register rt, Register rs, uint16_t pos, uint16_t size);
740 // ---------------------------------------------------------------------------
741 // FPU macros. These do not handle special cases like NaN or +- inf.
743 // Convert unsigned word to double.
744 void Cvt_d_uw(FPURegister fd, FPURegister fs, FPURegister scratch);
745 void Cvt_d_uw(FPURegister fd, Register rs, FPURegister scratch);
747 // Convert double to unsigned word.
748 void Trunc_uw_d(FPURegister fd, FPURegister fs, FPURegister scratch);
749 void Trunc_uw_d(FPURegister fd, Register rs, FPURegister scratch);
751 void Trunc_w_d(FPURegister fd, FPURegister fs);
752 void Round_w_d(FPURegister fd, FPURegister fs);
753 void Floor_w_d(FPURegister fd, FPURegister fs);
754 void Ceil_w_d(FPURegister fd, FPURegister fs);
756 // FP32 mode: Move the general purpose register into
757 // the high part of the double-register pair.
758 // FP64 mode: Move the general-purpose register into
759 // the higher 32 bits of the 64-bit coprocessor register,
760 // while leaving the low bits unchanged.
761 void Mthc1(Register rt, FPURegister fs);
763 // FP32 mode: move the high part of the double-register pair into
764 // general purpose register.
765 // FP64 mode: Move the higher 32 bits of the 64-bit coprocessor register into
766 // general-purpose register.
767 void Mfhc1(Register rt, FPURegister fs);
769 // Wrapper function for the different cmp/branch types.
770 void BranchF(Label* target,
775 BranchDelaySlot bd = PROTECT);
777 // Alternate (inline) version for better readability with USE_DELAY_SLOT.
778 inline void BranchF(BranchDelaySlot bd,
784 BranchF(target, nan, cc, cmp1, cmp2, bd);
787 // Truncates a double using a specific rounding mode, and writes the value
788 // to the result register.
789 // The except_flag will contain any exceptions caused by the instruction.
790 // If check_inexact is kDontCheckForInexactConversion, then the inexact
791 // exception is masked.
792 void EmitFPUTruncate(FPURoundingMode rounding_mode,
794 DoubleRegister double_input,
796 DoubleRegister double_scratch,
797 Register except_flag,
798 CheckForInexactConversion check_inexact
799 = kDontCheckForInexactConversion);
801 // Performs a truncating conversion of a floating point number as used by
802 // the JS bitwise operations. See ECMA-262 9.5: ToInt32. Goes to 'done' if it
803 // succeeds, otherwise falls through if result is saturated. On return
804 // 'result' either holds answer, or is clobbered on fall through.
806 // Only public for the test code in test-code-stubs-arm.cc.
807 void TryInlineTruncateDoubleToI(Register result,
808 DoubleRegister input,
811 // Performs a truncating conversion of a floating point number as used by
812 // the JS bitwise operations. See ECMA-262 9.5: ToInt32.
813 // Exits with 'result' holding the answer.
814 void TruncateDoubleToI(Register result, DoubleRegister double_input);
816 // Performs a truncating conversion of a heap number as used by
817 // the JS bitwise operations. See ECMA-262 9.5: ToInt32. 'result' and 'input'
818 // must be different registers. Exits with 'result' holding the answer.
819 void TruncateHeapNumberToI(Register result, Register object);
821 // Converts the smi or heap number in object to an int32 using the rules
822 // for ToInt32 as described in ECMAScript 9.5.: the value is truncated
823 // and brought into the range -2^31 .. +2^31 - 1. 'result' and 'input' must be
824 // different registers.
825 void TruncateNumberToI(Register object,
827 Register heap_number_map,
831 // Loads the number from object into dst register.
832 // If |object| is neither smi nor heap number, |not_number| is jumped to
833 // with |object| still intact.
834 void LoadNumber(Register object,
836 Register heap_number_map,
840 // Loads the number from object into double_dst in the double format.
841 // Control will jump to not_int32 if the value cannot be exactly represented
842 // by a 32-bit integer.
843 // Floating point value in the 32-bit integer range that are not exact integer
845 void LoadNumberAsInt32Double(Register object,
846 DoubleRegister double_dst,
847 Register heap_number_map,
850 FPURegister double_scratch,
853 // Loads the number from object into dst as a 32-bit integer.
854 // Control will jump to not_int32 if the object cannot be exactly represented
855 // by a 32-bit integer.
856 // Floating point value in the 32-bit integer range that are not exact integer
857 // won't be converted.
858 void LoadNumberAsInt32(Register object,
860 Register heap_number_map,
863 FPURegister double_scratch0,
864 FPURegister double_scratch1,
868 // argc - argument count to be dropped by LeaveExitFrame.
869 // save_doubles - saves FPU registers on stack, currently disabled.
870 // stack_space - extra stack space.
871 void EnterExitFrame(bool save_doubles,
872 int stack_space = 0);
874 // Leave the current exit frame.
875 void LeaveExitFrame(bool save_doubles,
877 bool restore_context,
878 bool do_return = NO_EMIT_RETURN);
880 // Get the actual activation frame alignment for target environment.
881 static int ActivationFrameAlignment();
883 // Make sure the stack is aligned. Only emits code in debug mode.
884 void AssertStackIsAligned();
886 void LoadContext(Register dst, int context_chain_length);
888 // Conditionally load the cached Array transitioned map of type
889 // transitioned_kind from the native context if the map in register
890 // map_in_out is the cached Array map in the native context of
892 void LoadTransitionedArrayMapConditional(
893 ElementsKind expected_kind,
894 ElementsKind transitioned_kind,
897 Label* no_map_match);
899 void LoadGlobalFunction(int index, Register function);
901 // Load the initial map from the global function. The registers
902 // function and map can be the same, function is then overwritten.
903 void LoadGlobalFunctionInitialMap(Register function,
907 void InitializeRootRegister() {
908 ExternalReference roots_array_start =
909 ExternalReference::roots_array_start(isolate());
910 li(kRootRegister, Operand(roots_array_start));
913 // -------------------------------------------------------------------------
914 // JavaScript invokes.
916 // Invoke the JavaScript function code by either calling or jumping.
917 void InvokeCode(Register code,
918 const ParameterCount& expected,
919 const ParameterCount& actual,
921 const CallWrapper& call_wrapper);
923 // Invoke the JavaScript function in the given register. Changes the
924 // current context to the context in the function before invoking.
925 void InvokeFunction(Register function,
926 const ParameterCount& actual,
928 const CallWrapper& call_wrapper);
930 void InvokeFunction(Register function,
931 const ParameterCount& expected,
932 const ParameterCount& actual,
934 const CallWrapper& call_wrapper);
936 void InvokeFunction(Handle<JSFunction> function,
937 const ParameterCount& expected,
938 const ParameterCount& actual,
940 const CallWrapper& call_wrapper);
943 void IsObjectJSObjectType(Register heap_object,
948 void IsInstanceJSObjectType(Register map,
952 void IsObjectJSStringType(Register object,
956 void IsObjectNameType(Register object,
960 // -------------------------------------------------------------------------
965 // -------------------------------------------------------------------------
966 // Exception handling.
968 // Push a new try handler and link into try handler chain.
969 void PushTryHandler(StackHandler::Kind kind, int handler_index);
971 // Unlink the stack handler on top of the stack from the try handler chain.
972 // Must preserve the result register.
973 void PopTryHandler();
975 // Passes thrown value to the handler of top of the try handler chain.
976 void Throw(Register value);
978 // Propagates an uncatchable exception to the top of the current JS stack's
980 void ThrowUncatchable(Register value);
982 // Copies a fixed number of fields of heap objects from src to dst.
983 void CopyFields(Register dst, Register src, RegList temps, int field_count);
985 // Copies a number of bytes from src to dst. All registers are clobbered. On
986 // exit src and dst will point to the place just after where the last byte was
987 // read or written and length will be zero.
988 void CopyBytes(Register src,
993 // Initialize fields with filler values. Fields starting at |start_offset|
994 // not including end_offset are overwritten with the value in |filler|. At
995 // the end the loop, |start_offset| takes the value of |end_offset|.
996 void InitializeFieldsWithFiller(Register start_offset,
1000 // -------------------------------------------------------------------------
1001 // Support functions.
1003 // Try to get function prototype of a function and puts the value in
1004 // the result register. Checks that the function really is a
1005 // function and jumps to the miss label if the fast checks fail. The
1006 // function register will be untouched; the other registers may be
1008 void TryGetFunctionPrototype(Register function,
1012 bool miss_on_bound_function = false);
1014 void GetObjectType(Register function,
1018 // Check if a map for a JSObject indicates that the object has fast elements.
1019 // Jump to the specified label if it does not.
1020 void CheckFastElements(Register map,
1024 // Check if a map for a JSObject indicates that the object can have both smi
1025 // and HeapObject elements. Jump to the specified label if it does not.
1026 void CheckFastObjectElements(Register map,
1030 // Check if a map for a JSObject indicates that the object has fast smi only
1031 // elements. Jump to the specified label if it does not.
1032 void CheckFastSmiElements(Register map,
1036 // Check to see if maybe_number can be stored as a double in
1037 // FastDoubleElements. If it can, store it at the index specified by key in
1038 // the FastDoubleElements array elements. Otherwise jump to fail.
1039 void StoreNumberToDoubleElements(Register value_reg,
1041 Register elements_reg,
1046 int elements_offset = 0);
1048 // Compare an object's map with the specified map and its transitioned
1049 // elements maps if mode is ALLOW_ELEMENT_TRANSITION_MAPS. Jumps to
1050 // "branch_to" if the result of the comparison is "cond". If multiple map
1051 // compares are required, the compare sequences branches to early_success.
1052 void CompareMapAndBranch(Register obj,
1055 Label* early_success,
1059 // As above, but the map of the object is already loaded into the register
1060 // which is preserved by the code generated.
1061 void CompareMapAndBranch(Register obj_map,
1063 Label* early_success,
1067 // Check if the map of an object is equal to a specified map and branch to
1068 // label if not. Skip the smi check if not required (object is known to be a
1069 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
1070 // against maps that are ElementsKind transition maps of the specificed map.
1071 void CheckMap(Register obj,
1075 SmiCheckType smi_check_type);
1078 void CheckMap(Register obj,
1080 Heap::RootListIndex index,
1082 SmiCheckType smi_check_type);
1084 // Check if the map of an object is equal to a specified map and branch to a
1085 // specified target if equal. Skip the smi check if not required (object is
1086 // known to be a heap object)
1087 void DispatchMap(Register obj,
1090 Handle<Code> success,
1091 SmiCheckType smi_check_type);
1094 // Load and check the instance type of an object for being a string.
1095 // Loads the type into the second argument register.
1096 // Returns a condition that will be enabled if the object was a string.
1097 Condition IsObjectStringType(Register obj,
1100 lw(type, FieldMemOperand(obj, HeapObject::kMapOffset));
1101 lbu(type, FieldMemOperand(type, Map::kInstanceTypeOffset));
1102 And(type, type, Operand(kIsNotStringMask));
1103 DCHECK_EQ(0, kStringTag);
1108 // Picks out an array index from the hash field.
1110 // hash - holds the index's hash. Clobbered.
1111 // index - holds the overwritten index on exit.
1112 void IndexFromHash(Register hash, Register index);
1114 // Get the number of least significant bits from a register.
1115 void GetLeastBitsFromSmi(Register dst, Register src, int num_least_bits);
1116 void GetLeastBitsFromInt32(Register dst, Register src, int mun_least_bits);
1118 // Load the value of a number object into a FPU double register. If the
1119 // object is not a number a jump to the label not_number is performed
1120 // and the FPU double register is unchanged.
1121 void ObjectToDoubleFPURegister(
1126 Register heap_number_map,
1128 ObjectToDoubleFlags flags = NO_OBJECT_TO_DOUBLE_FLAGS);
1130 // Load the value of a smi object into a FPU double register. The register
1131 // scratch1 can be the same register as smi in which case smi will hold the
1132 // untagged value afterwards.
1133 void SmiToDoubleFPURegister(Register smi,
1137 // -------------------------------------------------------------------------
1138 // Overflow handling functions.
1139 // Usage: first call the appropriate arithmetic function, then call one of the
1140 // jump functions with the overflow_dst register as the second parameter.
1142 void AdduAndCheckForOverflow(Register dst,
1145 Register overflow_dst,
1146 Register scratch = at);
1148 void AdduAndCheckForOverflow(Register dst, Register left,
1149 const Operand& right, Register overflow_dst,
1150 Register scratch = at);
1152 void SubuAndCheckForOverflow(Register dst,
1155 Register overflow_dst,
1156 Register scratch = at);
1158 void SubuAndCheckForOverflow(Register dst, Register left,
1159 const Operand& right, Register overflow_dst,
1160 Register scratch = at);
1162 void BranchOnOverflow(Label* label,
1163 Register overflow_check,
1164 BranchDelaySlot bd = PROTECT) {
1165 Branch(label, lt, overflow_check, Operand(zero_reg), bd);
1168 void BranchOnNoOverflow(Label* label,
1169 Register overflow_check,
1170 BranchDelaySlot bd = PROTECT) {
1171 Branch(label, ge, overflow_check, Operand(zero_reg), bd);
1174 void RetOnOverflow(Register overflow_check, BranchDelaySlot bd = PROTECT) {
1175 Ret(lt, overflow_check, Operand(zero_reg), bd);
1178 void RetOnNoOverflow(Register overflow_check, BranchDelaySlot bd = PROTECT) {
1179 Ret(ge, overflow_check, Operand(zero_reg), bd);
1182 // -------------------------------------------------------------------------
1185 // See comments at the beginning of CEntryStub::Generate.
1186 inline void PrepareCEntryArgs(int num_args) { li(a0, num_args); }
1188 inline void PrepareCEntryFunction(const ExternalReference& ref) {
1189 li(a1, Operand(ref));
1192 #define COND_ARGS Condition cond = al, Register rs = zero_reg, \
1193 const Operand& rt = Operand(zero_reg), BranchDelaySlot bd = PROTECT
1195 // Call a code stub.
1196 void CallStub(CodeStub* stub,
1197 TypeFeedbackId ast_id = TypeFeedbackId::None(),
1200 // Tail call a code stub (jump).
1201 void TailCallStub(CodeStub* stub, COND_ARGS);
1205 void CallJSExitStub(CodeStub* stub);
1207 // Call a runtime routine.
1208 void CallRuntime(const Runtime::Function* f,
1210 SaveFPRegsMode save_doubles = kDontSaveFPRegs);
1211 void CallRuntimeSaveDoubles(Runtime::FunctionId id) {
1212 const Runtime::Function* function = Runtime::FunctionForId(id);
1213 CallRuntime(function, function->nargs, kSaveFPRegs);
1216 // Convenience function: Same as above, but takes the fid instead.
1217 void CallRuntime(Runtime::FunctionId id,
1219 SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
1220 CallRuntime(Runtime::FunctionForId(id), num_arguments, save_doubles);
1223 // Convenience function: call an external reference.
1224 void CallExternalReference(const ExternalReference& ext,
1226 BranchDelaySlot bd = PROTECT);
1228 // Tail call of a runtime routine (jump).
1229 // Like JumpToExternalReference, but also takes care of passing the number
1231 void TailCallExternalReference(const ExternalReference& ext,
1235 // Convenience function: tail call a runtime routine (jump).
1236 void TailCallRuntime(Runtime::FunctionId fid,
1240 int CalculateStackPassedWords(int num_reg_arguments,
1241 int num_double_arguments);
1243 // Before calling a C-function from generated code, align arguments on stack
1244 // and add space for the four mips argument slots.
1245 // After aligning the frame, non-register arguments must be stored on the
1246 // stack, after the argument-slots using helper: CFunctionArgumentOperand().
1247 // The argument count assumes all arguments are word sized.
1248 // Some compilers/platforms require the stack to be aligned when calling
1250 // Needs a scratch register to do some arithmetic. This register will be
1252 void PrepareCallCFunction(int num_reg_arguments,
1253 int num_double_registers,
1255 void PrepareCallCFunction(int num_reg_arguments,
1258 // Arguments 1-4 are placed in registers a0 thru a3 respectively.
1259 // Arguments 5..n are stored to stack using following:
1260 // sw(t0, CFunctionArgumentOperand(5));
1262 // Calls a C function and cleans up the space for arguments allocated
1263 // by PrepareCallCFunction. The called function is not allowed to trigger a
1264 // garbage collection, since that might move the code and invalidate the
1265 // return address (unless this is somehow accounted for by the called
1267 void CallCFunction(ExternalReference function, int num_arguments);
1268 void CallCFunction(Register function, int num_arguments);
1269 void CallCFunction(ExternalReference function,
1270 int num_reg_arguments,
1271 int num_double_arguments);
1272 void CallCFunction(Register function,
1273 int num_reg_arguments,
1274 int num_double_arguments);
1275 void MovFromFloatResult(DoubleRegister dst);
1276 void MovFromFloatParameter(DoubleRegister dst);
1278 // There are two ways of passing double arguments on MIPS, depending on
1279 // whether soft or hard floating point ABI is used. These functions
1280 // abstract parameter passing for the three different ways we call
1281 // C functions from generated code.
1282 void MovToFloatParameter(DoubleRegister src);
1283 void MovToFloatParameters(DoubleRegister src1, DoubleRegister src2);
1284 void MovToFloatResult(DoubleRegister src);
1286 // Calls an API function. Allocates HandleScope, extracts returned value
1287 // from handle and propagates exceptions. Restores context. stack_space
1288 // - space to be unwound on exit (includes the call JS arguments space and
1289 // the additional space allocated for the fast call).
1290 void CallApiFunctionAndReturn(Register function_address,
1291 ExternalReference thunk_ref,
1293 MemOperand return_value_operand,
1294 MemOperand* context_restore_operand);
1296 // Jump to the builtin routine.
1297 void JumpToExternalReference(const ExternalReference& builtin,
1298 BranchDelaySlot bd = PROTECT);
1300 // Invoke specified builtin JavaScript function. Adds an entry to
1301 // the unresolved list if the name does not resolve.
1302 void InvokeBuiltin(Builtins::JavaScript id,
1304 const CallWrapper& call_wrapper = NullCallWrapper());
1306 // Store the code object for the given builtin in the target register and
1307 // setup the function in a1.
1308 void GetBuiltinEntry(Register target, Builtins::JavaScript id);
1310 // Store the function for the given builtin in the target register.
1311 void GetBuiltinFunction(Register target, Builtins::JavaScript id);
1315 uint32_t flags; // See Bootstrapper::FixupFlags decoders/encoders.
1319 Handle<Object> CodeObject() {
1320 DCHECK(!code_object_.is_null());
1321 return code_object_;
1324 // Emit code for a truncating division by a constant. The dividend register is
1325 // unchanged and at gets clobbered. Dividend and result must be different.
1326 void TruncatingDiv(Register result, Register dividend, int32_t divisor);
1328 // -------------------------------------------------------------------------
1329 // StatsCounter support.
1331 void SetCounter(StatsCounter* counter, int value,
1332 Register scratch1, Register scratch2);
1333 void IncrementCounter(StatsCounter* counter, int value,
1334 Register scratch1, Register scratch2);
1335 void DecrementCounter(StatsCounter* counter, int value,
1336 Register scratch1, Register scratch2);
1339 // -------------------------------------------------------------------------
1342 // Calls Abort(msg) if the condition cc is not satisfied.
1343 // Use --debug_code to enable.
1344 void Assert(Condition cc, BailoutReason reason, Register rs, Operand rt);
1345 void AssertFastElements(Register elements);
1347 // Like Assert(), but always enabled.
1348 void Check(Condition cc, BailoutReason reason, Register rs, Operand rt);
1350 // Print a message to stdout and abort execution.
1351 void Abort(BailoutReason msg);
1353 // Verify restrictions about code generated in stubs.
1354 void set_generating_stub(bool value) { generating_stub_ = value; }
1355 bool generating_stub() { return generating_stub_; }
1356 void set_has_frame(bool value) { has_frame_ = value; }
1357 bool has_frame() { return has_frame_; }
1358 inline bool AllowThisStubCall(CodeStub* stub);
1360 // ---------------------------------------------------------------------------
1361 // Number utilities.
1363 // Check whether the value of reg is a power of two and not zero. If not
1364 // control continues at the label not_power_of_two. If reg is a power of two
1365 // the register scratch contains the value of (reg - 1) when control falls
1367 void JumpIfNotPowerOfTwoOrZero(Register reg,
1369 Label* not_power_of_two_or_zero);
1371 // -------------------------------------------------------------------------
1374 void SmiTag(Register reg) {
1375 Addu(reg, reg, reg);
1378 // Test for overflow < 0: use BranchOnOverflow() or BranchOnNoOverflow().
1379 void SmiTagCheckOverflow(Register reg, Register overflow);
1380 void SmiTagCheckOverflow(Register dst, Register src, Register overflow);
1382 void SmiTag(Register dst, Register src) {
1383 Addu(dst, src, src);
1386 // Try to convert int32 to smi. If the value is to large, preserve
1387 // the original value and jump to not_a_smi. Destroys scratch and
1389 void TrySmiTag(Register reg, Register scratch, Label* not_a_smi) {
1390 TrySmiTag(reg, reg, scratch, not_a_smi);
1392 void TrySmiTag(Register dst,
1396 SmiTagCheckOverflow(at, src, scratch);
1397 BranchOnOverflow(not_a_smi, scratch);
1401 void SmiUntag(Register reg) {
1402 sra(reg, reg, kSmiTagSize);
1405 void SmiUntag(Register dst, Register src) {
1406 sra(dst, src, kSmiTagSize);
1409 // Test if the register contains a smi.
1410 inline void SmiTst(Register value, Register scratch) {
1411 And(scratch, value, Operand(kSmiTagMask));
1413 inline void NonNegativeSmiTst(Register value, Register scratch) {
1414 And(scratch, value, Operand(kSmiTagMask | kSmiSignMask));
1417 // Untag the source value into destination and jump if source is a smi.
1418 // Souce and destination can be the same register.
1419 void UntagAndJumpIfSmi(Register dst, Register src, Label* smi_case);
1421 // Untag the source value into destination and jump if source is not a smi.
1422 // Souce and destination can be the same register.
1423 void UntagAndJumpIfNotSmi(Register dst, Register src, Label* non_smi_case);
1425 // Jump the register contains a smi.
1426 void JumpIfSmi(Register value,
1428 Register scratch = at,
1429 BranchDelaySlot bd = PROTECT);
1431 // Jump if the register contains a non-smi.
1432 void JumpIfNotSmi(Register value,
1433 Label* not_smi_label,
1434 Register scratch = at,
1435 BranchDelaySlot bd = PROTECT);
1437 // Jump if either of the registers contain a non-smi.
1438 void JumpIfNotBothSmi(Register reg1, Register reg2, Label* on_not_both_smi);
1439 // Jump if either of the registers contain a smi.
1440 void JumpIfEitherSmi(Register reg1, Register reg2, Label* on_either_smi);
1442 // Abort execution if argument is a smi, enabled via --debug-code.
1443 void AssertNotSmi(Register object);
1444 void AssertSmi(Register object);
1446 // Abort execution if argument is not a string, enabled via --debug-code.
1447 void AssertString(Register object);
1449 // Abort execution if argument is not a name, enabled via --debug-code.
1450 void AssertName(Register object);
1452 // Abort execution if argument is not undefined or an AllocationSite, enabled
1453 // via --debug-code.
1454 void AssertUndefinedOrAllocationSite(Register object, Register scratch);
1456 // Abort execution if reg is not the root value with the given index,
1457 // enabled via --debug-code.
1458 void AssertIsRoot(Register reg, Heap::RootListIndex index);
1460 // ---------------------------------------------------------------------------
1461 // HeapNumber utilities.
1463 void JumpIfNotHeapNumber(Register object,
1464 Register heap_number_map,
1466 Label* on_not_heap_number);
1468 // -------------------------------------------------------------------------
1469 // String utilities.
1471 // Generate code to do a lookup in the number string cache. If the number in
1472 // the register object is found in the cache the generated code falls through
1473 // with the result in the result register. The object and the result register
1474 // can be the same. If the number is not found in the cache the code jumps to
1475 // the label not_found with only the content of register object unchanged.
1476 void LookupNumberStringCache(Register object,
1483 // Checks if both instance types are sequential ASCII strings and jumps to
1484 // label if either is not.
1485 void JumpIfBothInstanceTypesAreNotSequentialOneByte(
1486 Register first_object_instance_type, Register second_object_instance_type,
1487 Register scratch1, Register scratch2, Label* failure);
1489 // Check if instance type is sequential one-byte string and jump to label if
1491 void JumpIfInstanceTypeIsNotSequentialOneByte(Register type, Register scratch,
1494 void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name);
1496 void EmitSeqStringSetCharCheck(Register string,
1500 uint32_t encoding_mask);
1502 // Checks if both objects are sequential one-byte strings and jumps to label
1503 // if either is not. Assumes that neither object is a smi.
1504 void JumpIfNonSmisNotBothSequentialOneByteStrings(Register first,
1510 // Checks if both objects are sequential one-byte strings and jumps to label
1511 // if either is not.
1512 void JumpIfNotBothSequentialOneByteStrings(Register first, Register second,
1515 Label* not_flat_one_byte_strings);
1517 void ClampUint8(Register output_reg, Register input_reg);
1519 void ClampDoubleToUint8(Register result_reg,
1520 DoubleRegister input_reg,
1521 DoubleRegister temp_double_reg);
1524 void LoadInstanceDescriptors(Register map, Register descriptors);
1525 void EnumLength(Register dst, Register map);
1526 void NumberOfOwnDescriptors(Register dst, Register map);
1528 template<typename Field>
1529 void DecodeField(Register dst, Register src) {
1530 Ext(dst, src, Field::kShift, Field::kSize);
1533 template<typename Field>
1534 void DecodeField(Register reg) {
1535 DecodeField<Field>(reg, reg);
1538 template<typename Field>
1539 void DecodeFieldToSmi(Register dst, Register src) {
1540 static const int shift = Field::kShift;
1541 static const int mask = Field::kMask >> shift << kSmiTagSize;
1542 STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0);
1543 STATIC_ASSERT(kSmiTag == 0);
1544 if (shift < kSmiTagSize) {
1545 sll(dst, src, kSmiTagSize - shift);
1546 And(dst, dst, Operand(mask));
1547 } else if (shift > kSmiTagSize) {
1548 srl(dst, src, shift - kSmiTagSize);
1549 And(dst, dst, Operand(mask));
1551 And(dst, src, Operand(mask));
1555 template<typename Field>
1556 void DecodeFieldToSmi(Register reg) {
1557 DecodeField<Field>(reg, reg);
1560 // Generates function and stub prologue code.
1561 void StubPrologue();
1562 void Prologue(bool code_pre_aging);
1564 // Activation support.
1565 void EnterFrame(StackFrame::Type type);
1566 void LeaveFrame(StackFrame::Type type);
1568 // Patch the relocated value (lui/ori pair).
1569 void PatchRelocatedValue(Register li_location,
1571 Register new_value);
1572 // Get the relocatad value (loaded data) from the lui/ori pair.
1573 void GetRelocatedValue(Register li_location,
1577 // Expects object in a0 and returns map with validated enum cache
1578 // in a0. Assumes that any other register can be used as a scratch.
1579 void CheckEnumCache(Register null_value, Label* call_runtime);
1581 // AllocationMemento support. Arrays may have an associated
1582 // AllocationMemento object that can be checked for in order to pretransition
1584 // On entry, receiver_reg should point to the array object.
1585 // scratch_reg gets clobbered.
1586 // If allocation info is present, jump to allocation_memento_present.
1587 void TestJSArrayForAllocationMemento(
1588 Register receiver_reg,
1589 Register scratch_reg,
1590 Label* no_memento_found,
1591 Condition cond = al,
1592 Label* allocation_memento_present = NULL);
1594 void JumpIfJSArrayHasAllocationMemento(Register receiver_reg,
1595 Register scratch_reg,
1596 Label* memento_found) {
1597 Label no_memento_found;
1598 TestJSArrayForAllocationMemento(receiver_reg, scratch_reg,
1599 &no_memento_found, eq, memento_found);
1600 bind(&no_memento_found);
1603 // Jumps to found label if a prototype map has dictionary elements.
1604 void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0,
1605 Register scratch1, Label* found);
1608 void CallCFunctionHelper(Register function,
1609 int num_reg_arguments,
1610 int num_double_arguments);
1612 void BranchAndLinkShort(int16_t offset, BranchDelaySlot bdslot = PROTECT);
1613 void BranchAndLinkShort(int16_t offset, Condition cond, Register rs,
1615 BranchDelaySlot bdslot = PROTECT);
1616 void BranchAndLinkShort(Label* L, BranchDelaySlot bdslot = PROTECT);
1617 void BranchAndLinkShort(Label* L, Condition cond, Register rs,
1619 BranchDelaySlot bdslot = PROTECT);
1620 void J(Label* L, BranchDelaySlot bdslot);
1621 void Jr(Label* L, BranchDelaySlot bdslot);
1622 void Jalr(Label* L, BranchDelaySlot bdslot);
1624 // Helper functions for generating invokes.
1625 void InvokePrologue(const ParameterCount& expected,
1626 const ParameterCount& actual,
1627 Handle<Code> code_constant,
1630 bool* definitely_mismatches,
1632 const CallWrapper& call_wrapper);
1634 // Get the code for the given builtin. Returns if able to resolve
1635 // the function in the 'resolved' flag.
1636 Handle<Code> ResolveBuiltin(Builtins::JavaScript id, bool* resolved);
1638 void InitializeNewString(Register string,
1640 Heap::RootListIndex map_index,
1644 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
1645 void InNewSpace(Register object,
1647 Condition cond, // eq for new space, ne otherwise.
1650 // Helper for finding the mark bits for an address. Afterwards, the
1651 // bitmap register points at the word with the mark bits and the mask
1652 // the position of the first bit. Leaves addr_reg unchanged.
1653 inline void GetMarkBits(Register addr_reg,
1654 Register bitmap_reg,
1657 // Helper for throwing exceptions. Compute a handler address and jump to
1658 // it. See the implementation for register usage.
1659 void JumpToHandlerEntry();
1661 // Compute memory operands for safepoint stack slots.
1662 static int SafepointRegisterStackIndex(int reg_code);
1663 MemOperand SafepointRegisterSlot(Register reg);
1664 MemOperand SafepointRegistersAndDoublesSlot(Register reg);
1666 bool generating_stub_;
1668 // This handle will be patched with the code object on installation.
1669 Handle<Object> code_object_;
1671 // Needs access to SafepointRegisterStackIndex for compiled frame
1673 friend class StandardFrame;
1677 // The code patcher is used to patch (typically) small parts of code e.g. for
1678 // debugging and other types of instrumentation. When using the code patcher
1679 // the exact number of bytes specified must be emitted. It is not legal to emit
1680 // relocation information. If any of these constraints are violated it causes
1681 // an assertion to fail.
1689 CodePatcher(byte* address,
1691 FlushICache flush_cache = FLUSH);
1692 virtual ~CodePatcher();
1694 // Macro assembler to emit code.
1695 MacroAssembler* masm() { return &masm_; }
1697 // Emit an instruction directly.
1698 void Emit(Instr instr);
1700 // Emit an address directly.
1701 void Emit(Address addr);
1703 // Change the condition part of an instruction leaving the rest of the current
1704 // instruction unchanged.
1705 void ChangeBranchCondition(Condition cond);
1708 byte* address_; // The address of the code being patched.
1709 int size_; // Number of bytes of the expected patch size.
1710 MacroAssembler masm_; // Macro assembler used to generate the code.
1711 FlushICache flush_cache_; // Whether to flush the I cache after patching.
1716 #ifdef GENERATED_CODE_COVERAGE
1717 #define CODE_COVERAGE_STRINGIFY(x) #x
1718 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
1719 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
1720 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
1722 #define ACCESS_MASM(masm) masm->
1725 } } // namespace v8::internal
1727 #endif // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_