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 #include "src/arm64/assembler-arm64.h" 6 #include "src/arm64/constants-arm64.h" 7 8 #ifndef V8_ARM64_FRAMES_ARM64_H_ 9 #define V8_ARM64_FRAMES_ARM64_H_ 10 11 namespace v8 { 12 namespace internal { 13 14 const int kNumRegs = kNumberOfRegisters; 15 // Registers x0-x17 are caller-saved. 16 const int kNumJSCallerSaved = 18; 17 const RegList kJSCallerSaved = 0x3ffff; 18 19 // Number of registers for which space is reserved in safepoints. Must be a 20 // multiple of eight. 21 // TODO(all): Refine this number. 22 const int kNumSafepointRegisters = 32; 23 24 // Define the list of registers actually saved at safepoints. 25 // Note that the number of saved registers may be smaller than the reserved 26 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. 27 #define kSafepointSavedRegisters CPURegList::GetSafepointSavedRegisters().list() 28 #define kNumSafepointSavedRegisters \ 29 CPURegList::GetSafepointSavedRegisters().Count(); 30 31 class EntryFrameConstants : public AllStatic { 32 public: 33 static const int kCallerFPOffset = 34 -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize); 35 }; 36 37 38 class ExitFrameConstants : public AllStatic { 39 public: 40 static const int kFrameSize = 2 * kPointerSize; 41 42 static const int kCallerSPDisplacement = 2 * kPointerSize; 43 static const int kCallerPCOffset = 1 * kPointerSize; 44 static const int kCallerFPOffset = 0 * kPointerSize; // <- fp 45 static const int kSPOffset = -1 * kPointerSize; 46 static const int kCodeOffset = -2 * kPointerSize; 47 static const int kLastExitFrameField = kCodeOffset; 48 49 static const int kConstantPoolOffset = 0; // Not used 50 }; 51 52 53 class JavaScriptFrameConstants : public AllStatic { 54 public: 55 // FP-relative. 56 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 57 58 // There are two words on the stack (saved fp and saved lr) between fp and 59 // the arguments. 60 static const int kLastParameterOffset = 2 * kPointerSize; 61 62 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 63 }; 64 65 66 class ArgumentsAdaptorFrameConstants : public AllStatic { 67 public: 68 // FP-relative. 69 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 70 71 static const int kFrameSize = 72 StandardFrameConstants::kFixedFrameSize + kPointerSize; 73 }; 74 75 76 class ConstructFrameConstants : public AllStatic { 77 public: 78 // FP-relative. 79 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 80 static const int kLengthOffset = -4 * kPointerSize; 81 static const int kConstructorOffset = -5 * kPointerSize; 82 static const int kImplicitReceiverOffset = -6 * kPointerSize; 83 84 static const int kFrameSize = 85 StandardFrameConstants::kFixedFrameSize + 4 * kPointerSize; 86 }; 87 88 89 class InternalFrameConstants : public AllStatic { 90 public: 91 // FP-relative. 92 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 93 }; 94 95 function_slot_object()96inline Object* JavaScriptFrame::function_slot_object() const { 97 const int offset = JavaScriptFrameConstants::kFunctionOffset; 98 return Memory::Object_at(fp() + offset); 99 } 100 101 SetFp(Address slot,Address fp)102inline void StackHandler::SetFp(Address slot, Address fp) { 103 Memory::Address_at(slot) = fp; 104 } 105 106 107 } } // namespace v8::internal 108 109 #endif // V8_ARM64_FRAMES_ARM64_H_ 110