1 // Copyright 2014 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_PPC_CODE_STUBS_PPC_H_
6 #define V8_PPC_CODE_STUBS_PPC_H_
8 #include "src/ppc/frames-ppc.h"
14 void ArrayNativeCode(MacroAssembler* masm, Label* call_generic_code);
17 class StringHelper : public AllStatic {
19 // Generate code for copying a large number of characters. This function
20 // is allowed to spend extra time setting up conditions to make copying
21 // faster. Copying of overlapping regions is not supported.
22 // Dest register ends at the position after the last character written.
23 static void GenerateCopyCharacters(MacroAssembler* masm, Register dest,
24 Register src, Register count,
26 String::Encoding encoding);
28 // Compares two flat one-byte strings and returns result in r0.
29 static void GenerateCompareFlatOneByteStrings(MacroAssembler* masm,
30 Register left, Register right,
35 // Compares two flat one-byte strings for equality and returns result in r0.
36 static void GenerateFlatOneByteStringEquals(MacroAssembler* masm,
37 Register left, Register right,
42 static void GenerateOneByteCharsCompareLoop(MacroAssembler* masm,
43 Register left, Register right,
46 Label* chars_not_equal);
48 DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper);
52 class StoreRegistersStateStub : public PlatformCodeStub {
54 explicit StoreRegistersStateStub(Isolate* isolate)
55 : PlatformCodeStub(isolate) {}
57 static void GenerateAheadOfTime(Isolate* isolate);
60 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
61 DEFINE_PLATFORM_CODE_STUB(StoreRegistersState, PlatformCodeStub);
65 class RestoreRegistersStateStub : public PlatformCodeStub {
67 explicit RestoreRegistersStateStub(Isolate* isolate)
68 : PlatformCodeStub(isolate) {}
70 static void GenerateAheadOfTime(Isolate* isolate);
73 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
74 DEFINE_PLATFORM_CODE_STUB(RestoreRegistersState, PlatformCodeStub);
78 class RecordWriteStub : public PlatformCodeStub {
80 RecordWriteStub(Isolate* isolate, Register object, Register value,
81 Register address, RememberedSetAction remembered_set_action,
82 SaveFPRegsMode fp_mode)
83 : PlatformCodeStub(isolate),
84 regs_(object, // An input reg.
85 address, // An input reg.
86 value) { // One scratch reg.
87 minor_key_ = ObjectBits::encode(object.code()) |
88 ValueBits::encode(value.code()) |
89 AddressBits::encode(address.code()) |
90 RememberedSetActionBits::encode(remembered_set_action) |
91 SaveFPRegsModeBits::encode(fp_mode);
94 RecordWriteStub(uint32_t key, Isolate* isolate)
95 : PlatformCodeStub(key, isolate), regs_(object(), address(), value()) {}
97 enum Mode { STORE_BUFFER_ONLY, INCREMENTAL, INCREMENTAL_COMPACTION };
99 bool SometimesSetsUpAFrame() override { return false; }
101 static void PatchBranchIntoNop(MacroAssembler* masm, int pos) {
102 // Consider adding DCHECK here to catch bad patching
103 masm->instr_at_put(pos, (masm->instr_at(pos) & ~kBOfieldMask) | BT);
106 static void PatchNopIntoBranch(MacroAssembler* masm, int pos) {
107 // Consider adding DCHECK here to catch bad patching
108 masm->instr_at_put(pos, (masm->instr_at(pos) & ~kBOfieldMask) | BF);
111 static Mode GetMode(Code* stub) {
112 Instr first_instruction =
113 Assembler::instr_at(stub->instruction_start() + Assembler::kInstrSize);
114 Instr second_instruction = Assembler::instr_at(stub->instruction_start() +
115 (Assembler::kInstrSize * 2));
117 // Consider adding DCHECK here to catch unexpected instruction sequence
118 if (BF == (first_instruction & kBOfieldMask)) {
122 if (BF == (second_instruction & kBOfieldMask)) {
123 return INCREMENTAL_COMPACTION;
126 return STORE_BUFFER_ONLY;
129 static void Patch(Code* stub, Mode mode) {
130 MacroAssembler masm(NULL, stub->instruction_start(),
131 stub->instruction_size());
133 case STORE_BUFFER_ONLY:
134 DCHECK(GetMode(stub) == INCREMENTAL ||
135 GetMode(stub) == INCREMENTAL_COMPACTION);
137 PatchBranchIntoNop(&masm, Assembler::kInstrSize);
138 PatchBranchIntoNop(&masm, Assembler::kInstrSize * 2);
141 DCHECK(GetMode(stub) == STORE_BUFFER_ONLY);
142 PatchNopIntoBranch(&masm, Assembler::kInstrSize);
144 case INCREMENTAL_COMPACTION:
145 DCHECK(GetMode(stub) == STORE_BUFFER_ONLY);
146 PatchNopIntoBranch(&masm, Assembler::kInstrSize * 2);
149 DCHECK(GetMode(stub) == mode);
150 Assembler::FlushICache(stub->GetIsolate(),
151 stub->instruction_start() + Assembler::kInstrSize,
152 2 * Assembler::kInstrSize);
155 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
158 // This is a helper class for freeing up 3 scratch registers. The input is
159 // two registers that must be preserved and one scratch register provided by
161 class RegisterAllocation {
163 RegisterAllocation(Register object, Register address, Register scratch0)
164 : object_(object), address_(address), scratch0_(scratch0) {
165 DCHECK(!AreAliased(scratch0, object, address, no_reg));
166 scratch1_ = GetRegisterThatIsNotOneOf(object_, address_, scratch0_);
169 void Save(MacroAssembler* masm) {
170 DCHECK(!AreAliased(object_, address_, scratch1_, scratch0_));
171 // We don't have to save scratch0_ because it was given to us as
172 // a scratch register.
173 masm->push(scratch1_);
176 void Restore(MacroAssembler* masm) { masm->pop(scratch1_); }
178 // If we have to call into C then we need to save and restore all caller-
179 // saved registers that were not already preserved. The scratch registers
180 // will be restored by other means so we don't bother pushing them here.
181 void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) {
184 masm->MultiPush(kJSCallerSaved & ~scratch1_.bit());
185 if (mode == kSaveFPRegs) {
186 // Save all volatile FP registers except d0.
187 masm->MultiPushDoubles(kCallerSavedDoubles & ~d0.bit());
191 inline void RestoreCallerSaveRegisters(MacroAssembler* masm,
192 SaveFPRegsMode mode) {
193 if (mode == kSaveFPRegs) {
194 // Restore all volatile FP registers except d0.
195 masm->MultiPopDoubles(kCallerSavedDoubles & ~d0.bit());
197 masm->MultiPop(kJSCallerSaved & ~scratch1_.bit());
202 inline Register object() { return object_; }
203 inline Register address() { return address_; }
204 inline Register scratch0() { return scratch0_; }
205 inline Register scratch1() { return scratch1_; }
213 friend class RecordWriteStub;
216 enum OnNoNeedToInformIncrementalMarker {
217 kReturnOnNoNeedToInformIncrementalMarker,
218 kUpdateRememberedSetOnNoNeedToInformIncrementalMarker
221 inline Major MajorKey() const final { return RecordWrite; }
223 void Generate(MacroAssembler* masm) override;
224 void GenerateIncremental(MacroAssembler* masm, Mode mode);
225 void CheckNeedsToInformIncrementalMarker(
226 MacroAssembler* masm, OnNoNeedToInformIncrementalMarker on_no_need,
228 void InformIncrementalMarker(MacroAssembler* masm);
230 void Activate(Code* code) override {
231 code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code);
234 Register object() const {
235 return Register::from_code(ObjectBits::decode(minor_key_));
238 Register value() const {
239 return Register::from_code(ValueBits::decode(minor_key_));
242 Register address() const {
243 return Register::from_code(AddressBits::decode(minor_key_));
246 RememberedSetAction remembered_set_action() const {
247 return RememberedSetActionBits::decode(minor_key_);
250 SaveFPRegsMode save_fp_regs_mode() const {
251 return SaveFPRegsModeBits::decode(minor_key_);
254 class ObjectBits : public BitField<int, 0, 5> {};
255 class ValueBits : public BitField<int, 5, 5> {};
256 class AddressBits : public BitField<int, 10, 5> {};
257 class RememberedSetActionBits : public BitField<RememberedSetAction, 15, 1> {
259 class SaveFPRegsModeBits : public BitField<SaveFPRegsMode, 16, 1> {};
262 RegisterAllocation regs_;
264 DISALLOW_COPY_AND_ASSIGN(RecordWriteStub);
268 // Trampoline stub to call into native code. To call safely into native code
269 // in the presence of compacting GC (which can move code objects) we need to
270 // keep the code which called into native pinned in the memory. Currently the
271 // simplest approach is to generate such stub early enough so it can never be
273 class DirectCEntryStub : public PlatformCodeStub {
275 explicit DirectCEntryStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
276 void GenerateCall(MacroAssembler* masm, Register target);
279 bool NeedsImmovableCode() override { return true; }
281 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
282 DEFINE_PLATFORM_CODE_STUB(DirectCEntry, PlatformCodeStub);
286 class NameDictionaryLookupStub : public PlatformCodeStub {
288 enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP };
290 NameDictionaryLookupStub(Isolate* isolate, LookupMode mode)
291 : PlatformCodeStub(isolate) {
292 minor_key_ = LookupModeBits::encode(mode);
295 static void GenerateNegativeLookup(MacroAssembler* masm, Label* miss,
296 Label* done, Register receiver,
297 Register properties, Handle<Name> name,
300 static void GeneratePositiveLookup(MacroAssembler* masm, Label* miss,
301 Label* done, Register elements,
302 Register name, Register r0, Register r1);
304 bool SometimesSetsUpAFrame() override { return false; }
307 static const int kInlinedProbes = 4;
308 static const int kTotalProbes = 20;
310 static const int kCapacityOffset =
311 NameDictionary::kHeaderSize +
312 NameDictionary::kCapacityIndex * kPointerSize;
314 static const int kElementsStartOffset =
315 NameDictionary::kHeaderSize +
316 NameDictionary::kElementsStartIndex * kPointerSize;
318 LookupMode mode() const { return LookupModeBits::decode(minor_key_); }
320 class LookupModeBits : public BitField<LookupMode, 0, 1> {};
322 DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();
323 DEFINE_PLATFORM_CODE_STUB(NameDictionaryLookup, PlatformCodeStub);
325 } // namespace internal
328 #endif // V8_PPC_CODE_STUBS_PPC_H_