Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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. |
| 4 | |
| 5 | #ifndef V8_X87_CODE_STUBS_X87_H_ |
| 6 | #define V8_X87_CODE_STUBS_X87_H_ |
| 7 | |
| 8 | namespace v8 { |
| 9 | namespace internal { |
| 10 | |
| 11 | |
| 12 | void ArrayNativeCode(MacroAssembler* masm, |
| 13 | bool construct_call, |
| 14 | Label* call_generic_code); |
| 15 | |
| 16 | |
| 17 | class StringHelper : public AllStatic { |
| 18 | public: |
| 19 | // Generate code for copying characters using the rep movs instruction. |
| 20 | // Copies ecx characters from esi to edi. Copying of overlapping regions is |
| 21 | // not supported. |
| 22 | static void GenerateCopyCharacters(MacroAssembler* masm, |
| 23 | Register dest, |
| 24 | Register src, |
| 25 | Register count, |
| 26 | Register scratch, |
| 27 | String::Encoding encoding); |
| 28 | |
| 29 | // Compares two flat one byte strings and returns result in eax. |
| 30 | static void GenerateCompareFlatOneByteStrings(MacroAssembler* masm, |
| 31 | Register left, Register right, |
| 32 | Register scratch1, |
| 33 | Register scratch2, |
| 34 | Register scratch3); |
| 35 | |
| 36 | // Compares two flat one byte strings for equality and returns result in eax. |
| 37 | static void GenerateFlatOneByteStringEquals(MacroAssembler* masm, |
| 38 | Register left, Register right, |
| 39 | Register scratch1, |
| 40 | Register scratch2); |
| 41 | |
| 42 | private: |
| 43 | static void GenerateOneByteCharsCompareLoop( |
| 44 | MacroAssembler* masm, Register left, Register right, Register length, |
| 45 | Register scratch, Label* chars_not_equal, |
| 46 | Label::Distance chars_not_equal_near = Label::kFar); |
| 47 | |
| 48 | DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper); |
| 49 | }; |
| 50 | |
| 51 | |
| 52 | class NameDictionaryLookupStub: public PlatformCodeStub { |
| 53 | public: |
| 54 | enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP }; |
| 55 | |
| 56 | NameDictionaryLookupStub(Isolate* isolate, Register dictionary, |
| 57 | Register result, Register index, LookupMode mode) |
| 58 | : PlatformCodeStub(isolate) { |
| 59 | minor_key_ = DictionaryBits::encode(dictionary.code()) | |
| 60 | ResultBits::encode(result.code()) | |
| 61 | IndexBits::encode(index.code()) | LookupModeBits::encode(mode); |
| 62 | } |
| 63 | |
| 64 | static void GenerateNegativeLookup(MacroAssembler* masm, |
| 65 | Label* miss, |
| 66 | Label* done, |
| 67 | Register properties, |
| 68 | Handle<Name> name, |
| 69 | Register r0); |
| 70 | |
| 71 | static void GeneratePositiveLookup(MacroAssembler* masm, |
| 72 | Label* miss, |
| 73 | Label* done, |
| 74 | Register elements, |
| 75 | Register name, |
| 76 | Register r0, |
| 77 | Register r1); |
| 78 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 79 | bool SometimesSetsUpAFrame() override { return false; } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 80 | |
| 81 | private: |
| 82 | static const int kInlinedProbes = 4; |
| 83 | static const int kTotalProbes = 20; |
| 84 | |
| 85 | static const int kCapacityOffset = |
| 86 | NameDictionary::kHeaderSize + |
| 87 | NameDictionary::kCapacityIndex * kPointerSize; |
| 88 | |
| 89 | static const int kElementsStartOffset = |
| 90 | NameDictionary::kHeaderSize + |
| 91 | NameDictionary::kElementsStartIndex * kPointerSize; |
| 92 | |
| 93 | Register dictionary() const { |
| 94 | return Register::from_code(DictionaryBits::decode(minor_key_)); |
| 95 | } |
| 96 | |
| 97 | Register result() const { |
| 98 | return Register::from_code(ResultBits::decode(minor_key_)); |
| 99 | } |
| 100 | |
| 101 | Register index() const { |
| 102 | return Register::from_code(IndexBits::decode(minor_key_)); |
| 103 | } |
| 104 | |
| 105 | LookupMode mode() const { return LookupModeBits::decode(minor_key_); } |
| 106 | |
| 107 | class DictionaryBits: public BitField<int, 0, 3> {}; |
| 108 | class ResultBits: public BitField<int, 3, 3> {}; |
| 109 | class IndexBits: public BitField<int, 6, 3> {}; |
| 110 | class LookupModeBits: public BitField<LookupMode, 9, 1> {}; |
| 111 | |
| 112 | DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| 113 | DEFINE_PLATFORM_CODE_STUB(NameDictionaryLookup, PlatformCodeStub); |
| 114 | }; |
| 115 | |
| 116 | |
| 117 | class RecordWriteStub: public PlatformCodeStub { |
| 118 | public: |
| 119 | RecordWriteStub(Isolate* isolate, Register object, Register value, |
| 120 | Register address, RememberedSetAction remembered_set_action, |
| 121 | SaveFPRegsMode fp_mode) |
| 122 | : PlatformCodeStub(isolate), |
| 123 | regs_(object, // An input reg. |
| 124 | address, // An input reg. |
| 125 | value) { // One scratch reg. |
| 126 | minor_key_ = ObjectBits::encode(object.code()) | |
| 127 | ValueBits::encode(value.code()) | |
| 128 | AddressBits::encode(address.code()) | |
| 129 | RememberedSetActionBits::encode(remembered_set_action) | |
| 130 | SaveFPRegsModeBits::encode(fp_mode); |
| 131 | } |
| 132 | |
| 133 | RecordWriteStub(uint32_t key, Isolate* isolate) |
| 134 | : PlatformCodeStub(key, isolate), regs_(object(), address(), value()) {} |
| 135 | |
| 136 | enum Mode { |
| 137 | STORE_BUFFER_ONLY, |
| 138 | INCREMENTAL, |
| 139 | INCREMENTAL_COMPACTION |
| 140 | }; |
| 141 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 142 | bool SometimesSetsUpAFrame() override { return false; } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 143 | |
| 144 | static const byte kTwoByteNopInstruction = 0x3c; // Cmpb al, #imm8. |
| 145 | static const byte kTwoByteJumpInstruction = 0xeb; // Jmp #imm8. |
| 146 | |
| 147 | static const byte kFiveByteNopInstruction = 0x3d; // Cmpl eax, #imm32. |
| 148 | static const byte kFiveByteJumpInstruction = 0xe9; // Jmp #imm32. |
| 149 | |
| 150 | static Mode GetMode(Code* stub) { |
| 151 | byte first_instruction = stub->instruction_start()[0]; |
| 152 | byte second_instruction = stub->instruction_start()[2]; |
| 153 | |
| 154 | if (first_instruction == kTwoByteJumpInstruction) { |
| 155 | return INCREMENTAL; |
| 156 | } |
| 157 | |
| 158 | DCHECK(first_instruction == kTwoByteNopInstruction); |
| 159 | |
| 160 | if (second_instruction == kFiveByteJumpInstruction) { |
| 161 | return INCREMENTAL_COMPACTION; |
| 162 | } |
| 163 | |
| 164 | DCHECK(second_instruction == kFiveByteNopInstruction); |
| 165 | |
| 166 | return STORE_BUFFER_ONLY; |
| 167 | } |
| 168 | |
| 169 | static void Patch(Code* stub, Mode mode) { |
| 170 | switch (mode) { |
| 171 | case STORE_BUFFER_ONLY: |
| 172 | DCHECK(GetMode(stub) == INCREMENTAL || |
| 173 | GetMode(stub) == INCREMENTAL_COMPACTION); |
| 174 | stub->instruction_start()[0] = kTwoByteNopInstruction; |
| 175 | stub->instruction_start()[2] = kFiveByteNopInstruction; |
| 176 | break; |
| 177 | case INCREMENTAL: |
| 178 | DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| 179 | stub->instruction_start()[0] = kTwoByteJumpInstruction; |
| 180 | break; |
| 181 | case INCREMENTAL_COMPACTION: |
| 182 | DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| 183 | stub->instruction_start()[0] = kTwoByteNopInstruction; |
| 184 | stub->instruction_start()[2] = kFiveByteJumpInstruction; |
| 185 | break; |
| 186 | } |
| 187 | DCHECK(GetMode(stub) == mode); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 188 | Assembler::FlushICache(stub->GetIsolate(), stub->instruction_start(), 7); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| 192 | |
| 193 | private: |
| 194 | // This is a helper class for freeing up 3 scratch registers, where the third |
| 195 | // is always ecx (needed for shift operations). The input is two registers |
| 196 | // that must be preserved and one scratch register provided by the caller. |
| 197 | class RegisterAllocation { |
| 198 | public: |
| 199 | RegisterAllocation(Register object, |
| 200 | Register address, |
| 201 | Register scratch0) |
| 202 | : object_orig_(object), |
| 203 | address_orig_(address), |
| 204 | scratch0_orig_(scratch0), |
| 205 | object_(object), |
| 206 | address_(address), |
| 207 | scratch0_(scratch0) { |
| 208 | DCHECK(!AreAliased(scratch0, object, address, no_reg)); |
| 209 | scratch1_ = GetRegThatIsNotEcxOr(object_, address_, scratch0_); |
| 210 | if (scratch0.is(ecx)) { |
| 211 | scratch0_ = GetRegThatIsNotEcxOr(object_, address_, scratch1_); |
| 212 | } |
| 213 | if (object.is(ecx)) { |
| 214 | object_ = GetRegThatIsNotEcxOr(address_, scratch0_, scratch1_); |
| 215 | } |
| 216 | if (address.is(ecx)) { |
| 217 | address_ = GetRegThatIsNotEcxOr(object_, scratch0_, scratch1_); |
| 218 | } |
| 219 | DCHECK(!AreAliased(scratch0_, object_, address_, ecx)); |
| 220 | } |
| 221 | |
| 222 | void Save(MacroAssembler* masm) { |
| 223 | DCHECK(!address_orig_.is(object_)); |
| 224 | DCHECK(object_.is(object_orig_) || address_.is(address_orig_)); |
| 225 | DCHECK(!AreAliased(object_, address_, scratch1_, scratch0_)); |
| 226 | DCHECK(!AreAliased(object_orig_, address_, scratch1_, scratch0_)); |
| 227 | DCHECK(!AreAliased(object_, address_orig_, scratch1_, scratch0_)); |
| 228 | // We don't have to save scratch0_orig_ because it was given to us as |
| 229 | // a scratch register. But if we had to switch to a different reg then |
| 230 | // we should save the new scratch0_. |
| 231 | if (!scratch0_.is(scratch0_orig_)) masm->push(scratch0_); |
| 232 | if (!ecx.is(scratch0_orig_) && |
| 233 | !ecx.is(object_orig_) && |
| 234 | !ecx.is(address_orig_)) { |
| 235 | masm->push(ecx); |
| 236 | } |
| 237 | masm->push(scratch1_); |
| 238 | if (!address_.is(address_orig_)) { |
| 239 | masm->push(address_); |
| 240 | masm->mov(address_, address_orig_); |
| 241 | } |
| 242 | if (!object_.is(object_orig_)) { |
| 243 | masm->push(object_); |
| 244 | masm->mov(object_, object_orig_); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | void Restore(MacroAssembler* masm) { |
| 249 | // These will have been preserved the entire time, so we just need to move |
| 250 | // them back. Only in one case is the orig_ reg different from the plain |
| 251 | // one, since only one of them can alias with ecx. |
| 252 | if (!object_.is(object_orig_)) { |
| 253 | masm->mov(object_orig_, object_); |
| 254 | masm->pop(object_); |
| 255 | } |
| 256 | if (!address_.is(address_orig_)) { |
| 257 | masm->mov(address_orig_, address_); |
| 258 | masm->pop(address_); |
| 259 | } |
| 260 | masm->pop(scratch1_); |
| 261 | if (!ecx.is(scratch0_orig_) && |
| 262 | !ecx.is(object_orig_) && |
| 263 | !ecx.is(address_orig_)) { |
| 264 | masm->pop(ecx); |
| 265 | } |
| 266 | if (!scratch0_.is(scratch0_orig_)) masm->pop(scratch0_); |
| 267 | } |
| 268 | |
| 269 | // If we have to call into C then we need to save and restore all caller- |
| 270 | // saved registers that were not already preserved. The caller saved |
| 271 | // registers are eax, ecx and edx. The three scratch registers (incl. ecx) |
| 272 | // will be restored by other means so we don't bother pushing them here. |
| 273 | void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) { |
| 274 | if (!scratch0_.is(eax) && !scratch1_.is(eax)) masm->push(eax); |
| 275 | if (!scratch0_.is(edx) && !scratch1_.is(edx)) masm->push(edx); |
| 276 | if (mode == kSaveFPRegs) { |
| 277 | // Save FPU state in m108byte. |
| 278 | masm->sub(esp, Immediate(108)); |
| 279 | masm->fnsave(Operand(esp, 0)); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | inline void RestoreCallerSaveRegisters(MacroAssembler* masm, |
| 284 | SaveFPRegsMode mode) { |
| 285 | if (mode == kSaveFPRegs) { |
| 286 | // Restore FPU state in m108byte. |
| 287 | masm->frstor(Operand(esp, 0)); |
| 288 | masm->add(esp, Immediate(108)); |
| 289 | } |
| 290 | if (!scratch0_.is(edx) && !scratch1_.is(edx)) masm->pop(edx); |
| 291 | if (!scratch0_.is(eax) && !scratch1_.is(eax)) masm->pop(eax); |
| 292 | } |
| 293 | |
| 294 | inline Register object() { return object_; } |
| 295 | inline Register address() { return address_; } |
| 296 | inline Register scratch0() { return scratch0_; } |
| 297 | inline Register scratch1() { return scratch1_; } |
| 298 | |
| 299 | private: |
| 300 | Register object_orig_; |
| 301 | Register address_orig_; |
| 302 | Register scratch0_orig_; |
| 303 | Register object_; |
| 304 | Register address_; |
| 305 | Register scratch0_; |
| 306 | Register scratch1_; |
| 307 | // Third scratch register is always ecx. |
| 308 | |
| 309 | Register GetRegThatIsNotEcxOr(Register r1, |
| 310 | Register r2, |
| 311 | Register r3) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 312 | for (int i = 0; i < Register::kNumRegisters; i++) { |
| 313 | Register candidate = Register::from_code(i); |
| 314 | if (candidate.IsAllocatable()) { |
| 315 | if (candidate.is(ecx)) continue; |
| 316 | if (candidate.is(r1)) continue; |
| 317 | if (candidate.is(r2)) continue; |
| 318 | if (candidate.is(r3)) continue; |
| 319 | return candidate; |
| 320 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 321 | } |
| 322 | UNREACHABLE(); |
| 323 | return no_reg; |
| 324 | } |
| 325 | friend class RecordWriteStub; |
| 326 | }; |
| 327 | |
| 328 | enum OnNoNeedToInformIncrementalMarker { |
| 329 | kReturnOnNoNeedToInformIncrementalMarker, |
| 330 | kUpdateRememberedSetOnNoNeedToInformIncrementalMarker |
| 331 | }; |
| 332 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 333 | inline Major MajorKey() const final { return RecordWrite; } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 334 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 335 | void Generate(MacroAssembler* masm) override; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 336 | void GenerateIncremental(MacroAssembler* masm, Mode mode); |
| 337 | void CheckNeedsToInformIncrementalMarker( |
| 338 | MacroAssembler* masm, |
| 339 | OnNoNeedToInformIncrementalMarker on_no_need, |
| 340 | Mode mode); |
| 341 | void InformIncrementalMarker(MacroAssembler* masm); |
| 342 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 343 | void Activate(Code* code) override { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 344 | code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code); |
| 345 | } |
| 346 | |
| 347 | Register object() const { |
| 348 | return Register::from_code(ObjectBits::decode(minor_key_)); |
| 349 | } |
| 350 | |
| 351 | Register value() const { |
| 352 | return Register::from_code(ValueBits::decode(minor_key_)); |
| 353 | } |
| 354 | |
| 355 | Register address() const { |
| 356 | return Register::from_code(AddressBits::decode(minor_key_)); |
| 357 | } |
| 358 | |
| 359 | RememberedSetAction remembered_set_action() const { |
| 360 | return RememberedSetActionBits::decode(minor_key_); |
| 361 | } |
| 362 | |
| 363 | SaveFPRegsMode save_fp_regs_mode() const { |
| 364 | return SaveFPRegsModeBits::decode(minor_key_); |
| 365 | } |
| 366 | |
| 367 | class ObjectBits: public BitField<int, 0, 3> {}; |
| 368 | class ValueBits: public BitField<int, 3, 3> {}; |
| 369 | class AddressBits: public BitField<int, 6, 3> {}; |
| 370 | class RememberedSetActionBits: public BitField<RememberedSetAction, 9, 1> {}; |
| 371 | class SaveFPRegsModeBits : public BitField<SaveFPRegsMode, 10, 1> {}; |
| 372 | |
| 373 | RegisterAllocation regs_; |
| 374 | |
| 375 | DISALLOW_COPY_AND_ASSIGN(RecordWriteStub); |
| 376 | }; |
| 377 | |
| 378 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 379 | } // namespace internal |
| 380 | } // namespace v8 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 381 | |
| 382 | #endif // V8_X87_CODE_STUBS_X87_H_ |