Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2013 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_ARM64_CODE_STUBS_ARM64_H_ |
| 6 | #define V8_ARM64_CODE_STUBS_ARM64_H_ |
| 7 | |
| 8 | namespace v8 { |
| 9 | namespace internal { |
| 10 | |
| 11 | |
| 12 | void ArrayNativeCode(MacroAssembler* masm, Label* call_generic_code); |
| 13 | |
| 14 | |
| 15 | class StringHelper : public AllStatic { |
| 16 | public: |
| 17 | // Compares two flat one-byte strings and returns result in x0. |
| 18 | static void GenerateCompareFlatOneByteStrings( |
| 19 | MacroAssembler* masm, Register left, Register right, Register scratch1, |
| 20 | Register scratch2, Register scratch3, Register scratch4); |
| 21 | |
| 22 | // Compare two flat one-byte strings for equality and returns result in x0. |
| 23 | static void GenerateFlatOneByteStringEquals(MacroAssembler* masm, |
| 24 | Register left, Register right, |
| 25 | Register scratch1, |
| 26 | Register scratch2, |
| 27 | Register scratch3); |
| 28 | |
| 29 | private: |
| 30 | static void GenerateOneByteCharsCompareLoop( |
| 31 | MacroAssembler* masm, Register left, Register right, Register length, |
| 32 | Register scratch1, Register scratch2, Label* chars_not_equal); |
| 33 | |
| 34 | DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper); |
| 35 | }; |
| 36 | |
| 37 | |
| 38 | class StoreRegistersStateStub: public PlatformCodeStub { |
| 39 | public: |
| 40 | explicit StoreRegistersStateStub(Isolate* isolate) |
| 41 | : PlatformCodeStub(isolate) {} |
| 42 | |
| 43 | static Register to_be_pushed_lr() { return ip0; } |
| 44 | |
| 45 | static void GenerateAheadOfTime(Isolate* isolate); |
| 46 | |
| 47 | private: |
| 48 | DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| 49 | DEFINE_PLATFORM_CODE_STUB(StoreRegistersState, PlatformCodeStub); |
| 50 | }; |
| 51 | |
| 52 | |
| 53 | class RestoreRegistersStateStub: public PlatformCodeStub { |
| 54 | public: |
| 55 | explicit RestoreRegistersStateStub(Isolate* isolate) |
| 56 | : PlatformCodeStub(isolate) {} |
| 57 | |
| 58 | static void GenerateAheadOfTime(Isolate* isolate); |
| 59 | |
| 60 | private: |
| 61 | DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| 62 | DEFINE_PLATFORM_CODE_STUB(RestoreRegistersState, PlatformCodeStub); |
| 63 | }; |
| 64 | |
| 65 | |
| 66 | class RecordWriteStub: public PlatformCodeStub { |
| 67 | public: |
| 68 | // Stub to record the write of 'value' at 'address' in 'object'. |
| 69 | // Typically 'address' = 'object' + <some offset>. |
| 70 | // See MacroAssembler::RecordWriteField() for example. |
| 71 | RecordWriteStub(Isolate* isolate, |
| 72 | Register object, |
| 73 | Register value, |
| 74 | Register address, |
| 75 | RememberedSetAction remembered_set_action, |
| 76 | SaveFPRegsMode fp_mode) |
| 77 | : PlatformCodeStub(isolate), |
| 78 | regs_(object, // An input reg. |
| 79 | address, // An input reg. |
| 80 | value) { // One scratch reg. |
| 81 | DCHECK(object.Is64Bits()); |
| 82 | DCHECK(value.Is64Bits()); |
| 83 | DCHECK(address.Is64Bits()); |
| 84 | minor_key_ = ObjectBits::encode(object.code()) | |
| 85 | ValueBits::encode(value.code()) | |
| 86 | AddressBits::encode(address.code()) | |
| 87 | RememberedSetActionBits::encode(remembered_set_action) | |
| 88 | SaveFPRegsModeBits::encode(fp_mode); |
| 89 | } |
| 90 | |
| 91 | RecordWriteStub(uint32_t key, Isolate* isolate) |
| 92 | : PlatformCodeStub(key, isolate), regs_(object(), address(), value()) {} |
| 93 | |
| 94 | enum Mode { |
| 95 | STORE_BUFFER_ONLY, |
| 96 | INCREMENTAL, |
| 97 | INCREMENTAL_COMPACTION |
| 98 | }; |
| 99 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 100 | bool SometimesSetsUpAFrame() override { return false; } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 101 | |
| 102 | static Mode GetMode(Code* stub) { |
| 103 | // Find the mode depending on the first two instructions. |
| 104 | Instruction* instr1 = |
| 105 | reinterpret_cast<Instruction*>(stub->instruction_start()); |
| 106 | Instruction* instr2 = instr1->following(); |
| 107 | |
| 108 | if (instr1->IsUncondBranchImm()) { |
| 109 | DCHECK(instr2->IsPCRelAddressing() && (instr2->Rd() == xzr.code())); |
| 110 | return INCREMENTAL; |
| 111 | } |
| 112 | |
| 113 | DCHECK(instr1->IsPCRelAddressing() && (instr1->Rd() == xzr.code())); |
| 114 | |
| 115 | if (instr2->IsUncondBranchImm()) { |
| 116 | return INCREMENTAL_COMPACTION; |
| 117 | } |
| 118 | |
| 119 | DCHECK(instr2->IsPCRelAddressing()); |
| 120 | |
| 121 | return STORE_BUFFER_ONLY; |
| 122 | } |
| 123 | |
| 124 | // We patch the two first instructions of the stub back and forth between an |
| 125 | // adr and branch when we start and stop incremental heap marking. |
| 126 | // The branch is |
| 127 | // b label |
| 128 | // The adr is |
| 129 | // adr xzr label |
| 130 | // so effectively a nop. |
| 131 | static void Patch(Code* stub, Mode mode) { |
| 132 | // We are going to patch the two first instructions of the stub. |
| 133 | PatchingAssembler patcher( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 134 | stub->GetIsolate(), |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 135 | reinterpret_cast<Instruction*>(stub->instruction_start()), 2); |
| 136 | Instruction* instr1 = patcher.InstructionAt(0); |
| 137 | Instruction* instr2 = patcher.InstructionAt(kInstructionSize); |
| 138 | // Instructions must be either 'adr' or 'b'. |
| 139 | DCHECK(instr1->IsPCRelAddressing() || instr1->IsUncondBranchImm()); |
| 140 | DCHECK(instr2->IsPCRelAddressing() || instr2->IsUncondBranchImm()); |
| 141 | // Retrieve the offsets to the labels. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 142 | auto offset_to_incremental_noncompacting = |
| 143 | static_cast<int32_t>(instr1->ImmPCOffset()); |
| 144 | auto offset_to_incremental_compacting = |
| 145 | static_cast<int32_t>(instr2->ImmPCOffset()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 146 | |
| 147 | switch (mode) { |
| 148 | case STORE_BUFFER_ONLY: |
| 149 | DCHECK(GetMode(stub) == INCREMENTAL || |
| 150 | GetMode(stub) == INCREMENTAL_COMPACTION); |
| 151 | patcher.adr(xzr, offset_to_incremental_noncompacting); |
| 152 | patcher.adr(xzr, offset_to_incremental_compacting); |
| 153 | break; |
| 154 | case INCREMENTAL: |
| 155 | DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| 156 | patcher.b(offset_to_incremental_noncompacting >> kInstructionSizeLog2); |
| 157 | patcher.adr(xzr, offset_to_incremental_compacting); |
| 158 | break; |
| 159 | case INCREMENTAL_COMPACTION: |
| 160 | DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| 161 | patcher.adr(xzr, offset_to_incremental_noncompacting); |
| 162 | patcher.b(offset_to_incremental_compacting >> kInstructionSizeLog2); |
| 163 | break; |
| 164 | } |
| 165 | DCHECK(GetMode(stub) == mode); |
| 166 | } |
| 167 | |
| 168 | DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| 169 | |
| 170 | private: |
| 171 | // This is a helper class to manage the registers associated with the stub. |
| 172 | // The 'object' and 'address' registers must be preserved. |
| 173 | class RegisterAllocation { |
| 174 | public: |
| 175 | RegisterAllocation(Register object, |
| 176 | Register address, |
| 177 | Register scratch) |
| 178 | : object_(object), |
| 179 | address_(address), |
| 180 | scratch0_(scratch), |
| 181 | saved_regs_(kCallerSaved), |
| 182 | saved_fp_regs_(kCallerSavedFP) { |
| 183 | DCHECK(!AreAliased(scratch, object, address)); |
| 184 | |
| 185 | // The SaveCallerSaveRegisters method needs to save caller-saved |
| 186 | // registers, but we don't bother saving MacroAssembler scratch registers. |
| 187 | saved_regs_.Remove(MacroAssembler::DefaultTmpList()); |
| 188 | saved_fp_regs_.Remove(MacroAssembler::DefaultFPTmpList()); |
| 189 | |
| 190 | // We would like to require more scratch registers for this stub, |
| 191 | // but the number of registers comes down to the ones used in |
| 192 | // FullCodeGen::SetVar(), which is architecture independent. |
| 193 | // We allocate 2 extra scratch registers that we'll save on the stack. |
| 194 | CPURegList pool_available = GetValidRegistersForAllocation(); |
| 195 | CPURegList used_regs(object, address, scratch); |
| 196 | pool_available.Remove(used_regs); |
| 197 | scratch1_ = Register(pool_available.PopLowestIndex()); |
| 198 | scratch2_ = Register(pool_available.PopLowestIndex()); |
| 199 | |
| 200 | // The scratch registers will be restored by other means so we don't need |
| 201 | // to save them with the other caller saved registers. |
| 202 | saved_regs_.Remove(scratch0_); |
| 203 | saved_regs_.Remove(scratch1_); |
| 204 | saved_regs_.Remove(scratch2_); |
| 205 | } |
| 206 | |
| 207 | void Save(MacroAssembler* masm) { |
| 208 | // We don't have to save scratch0_ because it was given to us as |
| 209 | // a scratch register. |
| 210 | masm->Push(scratch1_, scratch2_); |
| 211 | } |
| 212 | |
| 213 | void Restore(MacroAssembler* masm) { |
| 214 | masm->Pop(scratch2_, scratch1_); |
| 215 | } |
| 216 | |
| 217 | // If we have to call into C then we need to save and restore all caller- |
| 218 | // saved registers that were not already preserved. |
| 219 | void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) { |
| 220 | // TODO(all): This can be very expensive, and it is likely that not every |
| 221 | // register will need to be preserved. Can we improve this? |
| 222 | masm->PushCPURegList(saved_regs_); |
| 223 | if (mode == kSaveFPRegs) { |
| 224 | masm->PushCPURegList(saved_fp_regs_); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | void RestoreCallerSaveRegisters(MacroAssembler*masm, SaveFPRegsMode mode) { |
| 229 | // TODO(all): This can be very expensive, and it is likely that not every |
| 230 | // register will need to be preserved. Can we improve this? |
| 231 | if (mode == kSaveFPRegs) { |
| 232 | masm->PopCPURegList(saved_fp_regs_); |
| 233 | } |
| 234 | masm->PopCPURegList(saved_regs_); |
| 235 | } |
| 236 | |
| 237 | Register object() { return object_; } |
| 238 | Register address() { return address_; } |
| 239 | Register scratch0() { return scratch0_; } |
| 240 | Register scratch1() { return scratch1_; } |
| 241 | Register scratch2() { return scratch2_; } |
| 242 | |
| 243 | private: |
| 244 | Register object_; |
| 245 | Register address_; |
| 246 | Register scratch0_; |
| 247 | Register scratch1_; |
| 248 | Register scratch2_; |
| 249 | CPURegList saved_regs_; |
| 250 | CPURegList saved_fp_regs_; |
| 251 | |
| 252 | // TODO(all): We should consider moving this somewhere else. |
| 253 | static CPURegList GetValidRegistersForAllocation() { |
| 254 | // The list of valid registers for allocation is defined as all the |
| 255 | // registers without those with a special meaning. |
| 256 | // |
| 257 | // The default list excludes registers x26 to x31 because they are |
| 258 | // reserved for the following purpose: |
| 259 | // - x26 root register |
| 260 | // - x27 context pointer register |
| 261 | // - x28 jssp |
| 262 | // - x29 frame pointer |
| 263 | // - x30 link register(lr) |
| 264 | // - x31 xzr/stack pointer |
| 265 | CPURegList list(CPURegister::kRegister, kXRegSizeInBits, 0, 25); |
| 266 | |
| 267 | // We also remove MacroAssembler's scratch registers. |
| 268 | list.Remove(MacroAssembler::DefaultTmpList()); |
| 269 | |
| 270 | return list; |
| 271 | } |
| 272 | |
| 273 | friend class RecordWriteStub; |
| 274 | }; |
| 275 | |
| 276 | enum OnNoNeedToInformIncrementalMarker { |
| 277 | kReturnOnNoNeedToInformIncrementalMarker, |
| 278 | kUpdateRememberedSetOnNoNeedToInformIncrementalMarker |
| 279 | }; |
| 280 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 281 | inline Major MajorKey() const final { return RecordWrite; } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 282 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 283 | void Generate(MacroAssembler* masm) override; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 284 | void GenerateIncremental(MacroAssembler* masm, Mode mode); |
| 285 | void CheckNeedsToInformIncrementalMarker( |
| 286 | MacroAssembler* masm, |
| 287 | OnNoNeedToInformIncrementalMarker on_no_need, |
| 288 | Mode mode); |
| 289 | void InformIncrementalMarker(MacroAssembler* masm); |
| 290 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 291 | void Activate(Code* code) override { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 292 | code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code); |
| 293 | } |
| 294 | |
| 295 | Register object() const { |
| 296 | return Register::from_code(ObjectBits::decode(minor_key_)); |
| 297 | } |
| 298 | |
| 299 | Register value() const { |
| 300 | return Register::from_code(ValueBits::decode(minor_key_)); |
| 301 | } |
| 302 | |
| 303 | Register address() const { |
| 304 | return Register::from_code(AddressBits::decode(minor_key_)); |
| 305 | } |
| 306 | |
| 307 | RememberedSetAction remembered_set_action() const { |
| 308 | return RememberedSetActionBits::decode(minor_key_); |
| 309 | } |
| 310 | |
| 311 | SaveFPRegsMode save_fp_regs_mode() const { |
| 312 | return SaveFPRegsModeBits::decode(minor_key_); |
| 313 | } |
| 314 | |
| 315 | class ObjectBits: public BitField<int, 0, 5> {}; |
| 316 | class ValueBits: public BitField<int, 5, 5> {}; |
| 317 | class AddressBits: public BitField<int, 10, 5> {}; |
| 318 | class RememberedSetActionBits: public BitField<RememberedSetAction, 15, 1> {}; |
| 319 | class SaveFPRegsModeBits: public BitField<SaveFPRegsMode, 16, 1> {}; |
| 320 | |
| 321 | Label slow_; |
| 322 | RegisterAllocation regs_; |
| 323 | }; |
| 324 | |
| 325 | |
| 326 | // Helper to call C++ functions from generated code. The caller must prepare |
| 327 | // the exit frame before doing the call with GenerateCall. |
| 328 | class DirectCEntryStub: public PlatformCodeStub { |
| 329 | public: |
| 330 | explicit DirectCEntryStub(Isolate* isolate) : PlatformCodeStub(isolate) {} |
| 331 | void GenerateCall(MacroAssembler* masm, Register target); |
| 332 | |
| 333 | private: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 334 | bool NeedsImmovableCode() override { return true; } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 335 | |
| 336 | DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| 337 | DEFINE_PLATFORM_CODE_STUB(DirectCEntry, PlatformCodeStub); |
| 338 | }; |
| 339 | |
| 340 | |
| 341 | class NameDictionaryLookupStub: public PlatformCodeStub { |
| 342 | public: |
| 343 | enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP }; |
| 344 | |
| 345 | NameDictionaryLookupStub(Isolate* isolate, LookupMode mode) |
| 346 | : PlatformCodeStub(isolate) { |
| 347 | minor_key_ = LookupModeBits::encode(mode); |
| 348 | } |
| 349 | |
| 350 | static void GenerateNegativeLookup(MacroAssembler* masm, |
| 351 | Label* miss, |
| 352 | Label* done, |
| 353 | Register receiver, |
| 354 | Register properties, |
| 355 | Handle<Name> name, |
| 356 | Register scratch0); |
| 357 | |
| 358 | static void GeneratePositiveLookup(MacroAssembler* masm, |
| 359 | Label* miss, |
| 360 | Label* done, |
| 361 | Register elements, |
| 362 | Register name, |
| 363 | Register scratch1, |
| 364 | Register scratch2); |
| 365 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 366 | bool SometimesSetsUpAFrame() override { return false; } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 367 | |
| 368 | private: |
| 369 | static const int kInlinedProbes = 4; |
| 370 | static const int kTotalProbes = 20; |
| 371 | |
| 372 | static const int kCapacityOffset = |
| 373 | NameDictionary::kHeaderSize + |
| 374 | NameDictionary::kCapacityIndex * kPointerSize; |
| 375 | |
| 376 | static const int kElementsStartOffset = |
| 377 | NameDictionary::kHeaderSize + |
| 378 | NameDictionary::kElementsStartIndex * kPointerSize; |
| 379 | |
| 380 | LookupMode mode() const { return LookupModeBits::decode(minor_key_); } |
| 381 | |
| 382 | class LookupModeBits: public BitField<LookupMode, 0, 1> {}; |
| 383 | |
| 384 | DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| 385 | DEFINE_PLATFORM_CODE_STUB(NameDictionaryLookup, PlatformCodeStub); |
| 386 | }; |
| 387 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 388 | } // namespace internal |
| 389 | } // namespace v8 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 390 | |
| 391 | #endif // V8_ARM64_CODE_STUBS_ARM64_H_ |