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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef V8_ARM_CODE_STUBS_ARM_H_ | 5 #ifndef V8_ARM_CODE_STUBS_ARM_H_ |
| 6 #define V8_ARM_CODE_STUBS_ARM_H_ | 6 #define V8_ARM_CODE_STUBS_ARM_H_ |
| 7 | 7 |
| 8 #include "src/ic-inl.h" | 8 #include "src/ic-inl.h" |
| 9 | 9 |
| 10 namespace v8 { | 10 namespace v8 { |
| (...skipping 162 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 173 enum Mode { | 173 enum Mode { |
| 174 STORE_BUFFER_ONLY, | 174 STORE_BUFFER_ONLY, |
| 175 INCREMENTAL, | 175 INCREMENTAL, |
| 176 INCREMENTAL_COMPACTION | 176 INCREMENTAL_COMPACTION |
| 177 }; | 177 }; |
| 178 | 178 |
| 179 virtual bool SometimesSetsUpAFrame() { return false; } | 179 virtual bool SometimesSetsUpAFrame() { return false; } |
| 180 | 180 |
| 181 static void PatchBranchIntoNop(MacroAssembler* masm, int pos) { | 181 static void PatchBranchIntoNop(MacroAssembler* masm, int pos) { |
| 182 masm->instr_at_put(pos, (masm->instr_at(pos) & ~B27) | (B24 | B20)); | 182 masm->instr_at_put(pos, (masm->instr_at(pos) & ~B27) | (B24 | B20)); |
| 183 ASSERT(Assembler::IsTstImmediate(masm->instr_at(pos))); | 183 DCHECK(Assembler::IsTstImmediate(masm->instr_at(pos))); |
| 184 } | 184 } |
| 185 | 185 |
| 186 static void PatchNopIntoBranch(MacroAssembler* masm, int pos) { | 186 static void PatchNopIntoBranch(MacroAssembler* masm, int pos) { |
| 187 masm->instr_at_put(pos, (masm->instr_at(pos) & ~(B24 | B20)) | B27); | 187 masm->instr_at_put(pos, (masm->instr_at(pos) & ~(B24 | B20)) | B27); |
| 188 ASSERT(Assembler::IsBranch(masm->instr_at(pos))); | 188 DCHECK(Assembler::IsBranch(masm->instr_at(pos))); |
| 189 } | 189 } |
| 190 | 190 |
| 191 static Mode GetMode(Code* stub) { | 191 static Mode GetMode(Code* stub) { |
| 192 Instr first_instruction = Assembler::instr_at(stub->instruction_start()); | 192 Instr first_instruction = Assembler::instr_at(stub->instruction_start()); |
| 193 Instr second_instruction = Assembler::instr_at(stub->instruction_start() + | 193 Instr second_instruction = Assembler::instr_at(stub->instruction_start() + |
| 194 Assembler::kInstrSize); | 194 Assembler::kInstrSize); |
| 195 | 195 |
| 196 if (Assembler::IsBranch(first_instruction)) { | 196 if (Assembler::IsBranch(first_instruction)) { |
| 197 return INCREMENTAL; | 197 return INCREMENTAL; |
| 198 } | 198 } |
| 199 | 199 |
| 200 ASSERT(Assembler::IsTstImmediate(first_instruction)); | 200 DCHECK(Assembler::IsTstImmediate(first_instruction)); |
| 201 | 201 |
| 202 if (Assembler::IsBranch(second_instruction)) { | 202 if (Assembler::IsBranch(second_instruction)) { |
| 203 return INCREMENTAL_COMPACTION; | 203 return INCREMENTAL_COMPACTION; |
| 204 } | 204 } |
| 205 | 205 |
| 206 ASSERT(Assembler::IsTstImmediate(second_instruction)); | 206 DCHECK(Assembler::IsTstImmediate(second_instruction)); |
| 207 | 207 |
| 208 return STORE_BUFFER_ONLY; | 208 return STORE_BUFFER_ONLY; |
| 209 } | 209 } |
| 210 | 210 |
| 211 static void Patch(Code* stub, Mode mode) { | 211 static void Patch(Code* stub, Mode mode) { |
| 212 MacroAssembler masm(NULL, | 212 MacroAssembler masm(NULL, |
| 213 stub->instruction_start(), | 213 stub->instruction_start(), |
| 214 stub->instruction_size()); | 214 stub->instruction_size()); |
| 215 switch (mode) { | 215 switch (mode) { |
| 216 case STORE_BUFFER_ONLY: | 216 case STORE_BUFFER_ONLY: |
| 217 ASSERT(GetMode(stub) == INCREMENTAL || | 217 DCHECK(GetMode(stub) == INCREMENTAL || |
| 218 GetMode(stub) == INCREMENTAL_COMPACTION); | 218 GetMode(stub) == INCREMENTAL_COMPACTION); |
| 219 PatchBranchIntoNop(&masm, 0); | 219 PatchBranchIntoNop(&masm, 0); |
| 220 PatchBranchIntoNop(&masm, Assembler::kInstrSize); | 220 PatchBranchIntoNop(&masm, Assembler::kInstrSize); |
| 221 break; | 221 break; |
| 222 case INCREMENTAL: | 222 case INCREMENTAL: |
| 223 ASSERT(GetMode(stub) == STORE_BUFFER_ONLY); | 223 DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| 224 PatchNopIntoBranch(&masm, 0); | 224 PatchNopIntoBranch(&masm, 0); |
| 225 break; | 225 break; |
| 226 case INCREMENTAL_COMPACTION: | 226 case INCREMENTAL_COMPACTION: |
| 227 ASSERT(GetMode(stub) == STORE_BUFFER_ONLY); | 227 DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| 228 PatchNopIntoBranch(&masm, Assembler::kInstrSize); | 228 PatchNopIntoBranch(&masm, Assembler::kInstrSize); |
| 229 break; | 229 break; |
| 230 } | 230 } |
| 231 ASSERT(GetMode(stub) == mode); | 231 DCHECK(GetMode(stub) == mode); |
| 232 CpuFeatures::FlushICache(stub->instruction_start(), | 232 CpuFeatures::FlushICache(stub->instruction_start(), |
| 233 2 * Assembler::kInstrSize); | 233 2 * Assembler::kInstrSize); |
| 234 } | 234 } |
| 235 | 235 |
| 236 private: | 236 private: |
| 237 // This is a helper class for freeing up 3 scratch registers. The input is | 237 // This is a helper class for freeing up 3 scratch registers. The input is |
| 238 // two registers that must be preserved and one scratch register provided by | 238 // two registers that must be preserved and one scratch register provided by |
| 239 // the caller. | 239 // the caller. |
| 240 class RegisterAllocation { | 240 class RegisterAllocation { |
| 241 public: | 241 public: |
| 242 RegisterAllocation(Register object, | 242 RegisterAllocation(Register object, |
| 243 Register address, | 243 Register address, |
| 244 Register scratch0) | 244 Register scratch0) |
| 245 : object_(object), | 245 : object_(object), |
| 246 address_(address), | 246 address_(address), |
| 247 scratch0_(scratch0) { | 247 scratch0_(scratch0) { |
| 248 ASSERT(!AreAliased(scratch0, object, address, no_reg)); | 248 DCHECK(!AreAliased(scratch0, object, address, no_reg)); |
| 249 scratch1_ = GetRegisterThatIsNotOneOf(object_, address_, scratch0_); | 249 scratch1_ = GetRegisterThatIsNotOneOf(object_, address_, scratch0_); |
| 250 } | 250 } |
| 251 | 251 |
| 252 void Save(MacroAssembler* masm) { | 252 void Save(MacroAssembler* masm) { |
| 253 ASSERT(!AreAliased(object_, address_, scratch1_, scratch0_)); | 253 DCHECK(!AreAliased(object_, address_, scratch1_, scratch0_)); |
| 254 // We don't have to save scratch0_ because it was given to us as | 254 // We don't have to save scratch0_ because it was given to us as |
| 255 // a scratch register. | 255 // a scratch register. |
| 256 masm->push(scratch1_); | 256 masm->push(scratch1_); |
| 257 } | 257 } |
| 258 | 258 |
| 259 void Restore(MacroAssembler* masm) { | 259 void Restore(MacroAssembler* masm) { |
| 260 masm->pop(scratch1_); | 260 masm->pop(scratch1_); |
| 261 } | 261 } |
| 262 | 262 |
| 263 // If we have to call into C then we need to save and restore all caller- | 263 // If we have to call into C then we need to save and restore all caller- |
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| 412 TargetAddressStorageMode storage_mode() { return storage_mode_; } | 412 TargetAddressStorageMode storage_mode() { return storage_mode_; } |
| 413 | 413 |
| 414 private: | 414 private: |
| 415 TargetAddressStorageMode storage_mode_; | 415 TargetAddressStorageMode storage_mode_; |
| 416 }; | 416 }; |
| 417 | 417 |
| 418 | 418 |
| 419 } } // namespace v8::internal | 419 } } // namespace v8::internal |
| 420 | 420 |
| 421 #endif // V8_ARM_CODE_STUBS_ARM_H_ | 421 #endif // V8_ARM_CODE_STUBS_ARM_H_ |
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