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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 #include "src/v8.h" | 5 #include "src/v8.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_ARM | 7 #if V8_TARGET_ARCH_ARM |
8 | 8 |
9 #include "src/arm/simulator-arm.h" | 9 #include "src/arm/simulator-arm.h" |
10 #include "src/codegen.h" | 10 #include "src/codegen.h" |
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881 // add(r0, pc, Operand(-8)) | 881 // add(r0, pc, Operand(-8)) |
882 static const uint32_t kCodeAgePatchFirstInstruction = 0xe24f0008; | 882 static const uint32_t kCodeAgePatchFirstInstruction = 0xe24f0008; |
883 #endif | 883 #endif |
884 | 884 |
885 CodeAgingHelper::CodeAgingHelper() { | 885 CodeAgingHelper::CodeAgingHelper() { |
886 DCHECK(young_sequence_.length() == kNoCodeAgeSequenceLength); | 886 DCHECK(young_sequence_.length() == kNoCodeAgeSequenceLength); |
887 // Since patcher is a large object, allocate it dynamically when needed, | 887 // Since patcher is a large object, allocate it dynamically when needed, |
888 // to avoid overloading the stack in stress conditions. | 888 // to avoid overloading the stack in stress conditions. |
889 // DONT_FLUSH is used because the CodeAgingHelper is initialized early in | 889 // DONT_FLUSH is used because the CodeAgingHelper is initialized early in |
890 // the process, before ARM simulator ICache is setup. | 890 // the process, before ARM simulator ICache is setup. |
891 SmartPointer<CodePatcher> patcher( | 891 base::SmartPointer<CodePatcher> patcher(new CodePatcher( |
892 new CodePatcher(young_sequence_.start(), | 892 young_sequence_.start(), young_sequence_.length() / Assembler::kInstrSize, |
893 young_sequence_.length() / Assembler::kInstrSize, | 893 CodePatcher::DONT_FLUSH)); |
894 CodePatcher::DONT_FLUSH)); | |
895 PredictableCodeSizeScope scope(patcher->masm(), young_sequence_.length()); | 894 PredictableCodeSizeScope scope(patcher->masm(), young_sequence_.length()); |
896 patcher->masm()->PushFixedFrame(r1); | 895 patcher->masm()->PushFixedFrame(r1); |
897 patcher->masm()->nop(ip.code()); | 896 patcher->masm()->nop(ip.code()); |
898 patcher->masm()->add( | 897 patcher->masm()->add( |
899 fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp)); | 898 fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp)); |
900 } | 899 } |
901 | 900 |
902 | 901 |
903 #ifdef DEBUG | 902 #ifdef DEBUG |
904 bool CodeAgingHelper::IsOld(byte* candidate) const { | 903 bool CodeAgingHelper::IsOld(byte* candidate) const { |
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943 patcher.masm()->ldr(pc, MemOperand(pc, -4)); | 942 patcher.masm()->ldr(pc, MemOperand(pc, -4)); |
944 patcher.masm()->emit_code_stub_address(stub); | 943 patcher.masm()->emit_code_stub_address(stub); |
945 } | 944 } |
946 } | 945 } |
947 | 946 |
948 | 947 |
949 } // namespace internal | 948 } // namespace internal |
950 } // namespace v8 | 949 } // namespace v8 |
951 | 950 |
952 #endif // V8_TARGET_ARCH_ARM | 951 #endif // V8_TARGET_ARCH_ARM |
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