1 // Copyright 2011 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_CODE_STUBS_ARM_H_
6 #define V8_MIPS_CODE_STUBS_ARM_H_
12 void ArrayNativeCode(MacroAssembler* masm, Label* call_generic_code);
15 class StringHelper : public AllStatic {
17 // Generate code for copying a large number of characters. This function
18 // is allowed to spend extra time setting up conditions to make copying
19 // faster. Copying of overlapping regions is not supported.
20 // Dest register ends at the position after the last character written.
21 static void GenerateCopyCharacters(MacroAssembler* masm,
26 String::Encoding encoding);
28 // Compares two flat one-byte strings and returns result in v0.
29 static void GenerateCompareFlatOneByteStrings(
30 MacroAssembler* masm, Register left, Register right, Register scratch1,
31 Register scratch2, Register scratch3, Register scratch4);
33 // Compares two flat one-byte strings for equality and returns result in v0.
34 static void GenerateFlatOneByteStringEquals(MacroAssembler* masm,
35 Register left, Register right,
41 static void GenerateOneByteCharsCompareLoop(
42 MacroAssembler* masm, Register left, Register right, Register length,
43 Register scratch1, Register scratch2, Register scratch3,
44 Label* chars_not_equal);
47 DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper);
51 class StoreRegistersStateStub: public PlatformCodeStub {
53 explicit StoreRegistersStateStub(Isolate* isolate)
54 : PlatformCodeStub(isolate) {}
56 static void GenerateAheadOfTime(Isolate* isolate);
59 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
60 DEFINE_PLATFORM_CODE_STUB(StoreRegistersState, PlatformCodeStub);
64 class RestoreRegistersStateStub: public PlatformCodeStub {
66 explicit RestoreRegistersStateStub(Isolate* isolate)
67 : PlatformCodeStub(isolate) {}
69 static void GenerateAheadOfTime(Isolate* isolate);
72 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
73 DEFINE_PLATFORM_CODE_STUB(RestoreRegistersState, PlatformCodeStub);
76 // This stub can convert a signed int32 to a heap number (double). It does
77 // not work for int32s that are in Smi range! No GC occurs during this stub
78 // so you don't have to set up the frame.
79 class WriteInt32ToHeapNumberStub : public PlatformCodeStub {
81 WriteInt32ToHeapNumberStub(Isolate* isolate, Register the_int,
82 Register the_heap_number, Register scratch,
84 : PlatformCodeStub(isolate) {
85 minor_key_ = IntRegisterBits::encode(the_int.code()) |
86 HeapNumberRegisterBits::encode(the_heap_number.code()) |
87 ScratchRegisterBits::encode(scratch.code()) |
88 SignRegisterBits::encode(scratch2.code());
89 DCHECK(IntRegisterBits::is_valid(the_int.code()));
90 DCHECK(HeapNumberRegisterBits::is_valid(the_heap_number.code()));
91 DCHECK(ScratchRegisterBits::is_valid(scratch.code()));
92 DCHECK(SignRegisterBits::is_valid(scratch2.code()));
95 static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate);
98 void Generate(MacroAssembler* masm);
100 Register the_int() const {
101 return Register::from_code(IntRegisterBits::decode(minor_key_));
104 Register the_heap_number() const {
105 return Register::from_code(HeapNumberRegisterBits::decode(minor_key_));
108 Register scratch() const {
109 return Register::from_code(ScratchRegisterBits::decode(minor_key_));
112 Register sign() const {
113 return Register::from_code(SignRegisterBits::decode(minor_key_));
116 // Minor key encoding in 16 bits.
117 class IntRegisterBits: public BitField<int, 0, 4> {};
118 class HeapNumberRegisterBits: public BitField<int, 4, 4> {};
119 class ScratchRegisterBits: public BitField<int, 8, 4> {};
120 class SignRegisterBits: public BitField<int, 12, 4> {};
122 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
123 DEFINE_CODE_STUB(WriteInt32ToHeapNumber, PlatformCodeStub);
127 class RecordWriteStub: public PlatformCodeStub {
129 RecordWriteStub(Isolate* isolate,
133 RememberedSetAction remembered_set_action,
134 SaveFPRegsMode fp_mode)
135 : PlatformCodeStub(isolate),
136 regs_(object, // An input reg.
137 address, // An input reg.
138 value) { // One scratch reg.
139 minor_key_ = ObjectBits::encode(object.code()) |
140 ValueBits::encode(value.code()) |
141 AddressBits::encode(address.code()) |
142 RememberedSetActionBits::encode(remembered_set_action) |
143 SaveFPRegsModeBits::encode(fp_mode);
146 RecordWriteStub(uint32_t key, Isolate* isolate)
147 : PlatformCodeStub(key, isolate), regs_(object(), address(), value()) {}
152 INCREMENTAL_COMPACTION
155 virtual bool SometimesSetsUpAFrame() { return false; }
157 static void PatchBranchIntoNop(MacroAssembler* masm, int pos) {
158 const unsigned offset = masm->instr_at(pos) & kImm16Mask;
159 masm->instr_at_put(pos, BNE | (zero_reg.code() << kRsShift) |
160 (zero_reg.code() << kRtShift) | (offset & kImm16Mask));
161 DCHECK(Assembler::IsBne(masm->instr_at(pos)));
164 static void PatchNopIntoBranch(MacroAssembler* masm, int pos) {
165 const unsigned offset = masm->instr_at(pos) & kImm16Mask;
166 masm->instr_at_put(pos, BEQ | (zero_reg.code() << kRsShift) |
167 (zero_reg.code() << kRtShift) | (offset & kImm16Mask));
168 DCHECK(Assembler::IsBeq(masm->instr_at(pos)));
171 static Mode GetMode(Code* stub) {
172 Instr first_instruction = Assembler::instr_at(stub->instruction_start());
173 Instr second_instruction = Assembler::instr_at(stub->instruction_start() +
174 2 * Assembler::kInstrSize);
176 if (Assembler::IsBeq(first_instruction)) {
180 DCHECK(Assembler::IsBne(first_instruction));
182 if (Assembler::IsBeq(second_instruction)) {
183 return INCREMENTAL_COMPACTION;
186 DCHECK(Assembler::IsBne(second_instruction));
188 return STORE_BUFFER_ONLY;
191 static void Patch(Code* stub, Mode mode) {
192 MacroAssembler masm(NULL,
193 stub->instruction_start(),
194 stub->instruction_size());
196 case STORE_BUFFER_ONLY:
197 DCHECK(GetMode(stub) == INCREMENTAL ||
198 GetMode(stub) == INCREMENTAL_COMPACTION);
199 PatchBranchIntoNop(&masm, 0);
200 PatchBranchIntoNop(&masm, 2 * Assembler::kInstrSize);
203 DCHECK(GetMode(stub) == STORE_BUFFER_ONLY);
204 PatchNopIntoBranch(&masm, 0);
206 case INCREMENTAL_COMPACTION:
207 DCHECK(GetMode(stub) == STORE_BUFFER_ONLY);
208 PatchNopIntoBranch(&masm, 2 * Assembler::kInstrSize);
211 DCHECK(GetMode(stub) == mode);
212 CpuFeatures::FlushICache(stub->instruction_start(),
213 4 * Assembler::kInstrSize);
216 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
219 // This is a helper class for freeing up 3 scratch registers. The input is
220 // two registers that must be preserved and one scratch register provided by
222 class RegisterAllocation {
224 RegisterAllocation(Register object,
229 scratch0_(scratch0) {
230 DCHECK(!AreAliased(scratch0, object, address, no_reg));
231 scratch1_ = GetRegisterThatIsNotOneOf(object_, address_, scratch0_);
234 void Save(MacroAssembler* masm) {
235 DCHECK(!AreAliased(object_, address_, scratch1_, scratch0_));
236 // We don't have to save scratch0_ because it was given to us as
237 // a scratch register.
238 masm->push(scratch1_);
241 void Restore(MacroAssembler* masm) {
242 masm->pop(scratch1_);
245 // If we have to call into C then we need to save and restore all caller-
246 // saved registers that were not already preserved. The scratch registers
247 // will be restored by other means so we don't bother pushing them here.
248 void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) {
249 masm->MultiPush((kJSCallerSaved | ra.bit()) & ~scratch1_.bit());
250 if (mode == kSaveFPRegs) {
251 masm->MultiPushFPU(kCallerSavedFPU);
255 inline void RestoreCallerSaveRegisters(MacroAssembler*masm,
256 SaveFPRegsMode mode) {
257 if (mode == kSaveFPRegs) {
258 masm->MultiPopFPU(kCallerSavedFPU);
260 masm->MultiPop((kJSCallerSaved | ra.bit()) & ~scratch1_.bit());
263 inline Register object() { return object_; }
264 inline Register address() { return address_; }
265 inline Register scratch0() { return scratch0_; }
266 inline Register scratch1() { return scratch1_; }
274 friend class RecordWriteStub;
277 enum OnNoNeedToInformIncrementalMarker {
278 kReturnOnNoNeedToInformIncrementalMarker,
279 kUpdateRememberedSetOnNoNeedToInformIncrementalMarker
282 virtual inline Major MajorKey() const FINAL OVERRIDE { return RecordWrite; }
284 virtual void Generate(MacroAssembler* masm) OVERRIDE;
285 void GenerateIncremental(MacroAssembler* masm, Mode mode);
286 void CheckNeedsToInformIncrementalMarker(
287 MacroAssembler* masm,
288 OnNoNeedToInformIncrementalMarker on_no_need,
290 void InformIncrementalMarker(MacroAssembler* masm);
292 void Activate(Code* code) {
293 code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code);
296 Register object() const {
297 return Register::from_code(ObjectBits::decode(minor_key_));
300 Register value() const {
301 return Register::from_code(ValueBits::decode(minor_key_));
304 Register address() const {
305 return Register::from_code(AddressBits::decode(minor_key_));
308 RememberedSetAction remembered_set_action() const {
309 return RememberedSetActionBits::decode(minor_key_);
312 SaveFPRegsMode save_fp_regs_mode() const {
313 return SaveFPRegsModeBits::decode(minor_key_);
316 class ObjectBits: public BitField<int, 0, 5> {};
317 class ValueBits: public BitField<int, 5, 5> {};
318 class AddressBits: public BitField<int, 10, 5> {};
319 class RememberedSetActionBits: public BitField<RememberedSetAction, 15, 1> {};
320 class SaveFPRegsModeBits: public BitField<SaveFPRegsMode, 16, 1> {};
323 RegisterAllocation regs_;
325 DISALLOW_COPY_AND_ASSIGN(RecordWriteStub);
329 // Trampoline stub to call into native code. To call safely into native code
330 // in the presence of compacting GC (which can move code objects) we need to
331 // keep the code which called into native pinned in the memory. Currently the
332 // simplest approach is to generate such stub early enough so it can never be
334 class DirectCEntryStub: public PlatformCodeStub {
336 explicit DirectCEntryStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
337 void GenerateCall(MacroAssembler* masm, Register target);
340 bool NeedsImmovableCode() { return true; }
342 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
343 DEFINE_PLATFORM_CODE_STUB(DirectCEntry, PlatformCodeStub);
347 class NameDictionaryLookupStub: public PlatformCodeStub {
349 enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP };
351 NameDictionaryLookupStub(Isolate* isolate, LookupMode mode)
352 : PlatformCodeStub(isolate) {
353 minor_key_ = LookupModeBits::encode(mode);
356 static void GenerateNegativeLookup(MacroAssembler* masm,
364 static void GeneratePositiveLookup(MacroAssembler* masm,
372 virtual bool SometimesSetsUpAFrame() { return false; }
375 static const int kInlinedProbes = 4;
376 static const int kTotalProbes = 20;
378 static const int kCapacityOffset =
379 NameDictionary::kHeaderSize +
380 NameDictionary::kCapacityIndex * kPointerSize;
382 static const int kElementsStartOffset =
383 NameDictionary::kHeaderSize +
384 NameDictionary::kElementsStartIndex * kPointerSize;
386 LookupMode mode() const { return LookupModeBits::decode(minor_key_); }
388 class LookupModeBits: public BitField<LookupMode, 0, 1> {};
390 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
391 DEFINE_PLATFORM_CODE_STUB(NameDictionaryLookup, PlatformCodeStub);
395 } } // namespace v8::internal
397 #endif // V8_MIPS_CODE_STUBS_ARM_H_