| // Copyright 2017 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_EXECUTION_FRAME_CONSTANTS_H_ |
| #define V8_EXECUTION_FRAME_CONSTANTS_H_ |
| |
| #include "src/common/globals.h" |
| #include "src/flags/flags.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Every pointer in a frame has a slot id. On 32-bit platforms, doubles consume |
| // two slots. |
| // |
| // Stack slot indices >= 0 access the callee stack with slot 0 corresponding to |
| // the callee's saved return address and 1 corresponding to the saved frame |
| // pointer. Some frames have additional information stored in the fixed header, |
| // for example JSFunctions store the function context and marker in the fixed |
| // header, with slot index 2 corresponding to the current function context and 3 |
| // corresponding to the frame marker/JSFunction. |
| // |
| // If V8_REVERSE_JSARGS is set, then the parameters are reversed in the stack, |
| // i.e., the first parameter (the receiver) is just above the return address. |
| // |
| // slot JS frame |
| // +-----------------+-------------------------------- |
| // -n-1 | parameter 0 | ^ |
| // |- - - - - - - - -| | |
| // -n | | Caller |
| // ... | ... | frame slots |
| // -2 | parameter n-1 | (slot < 0) |
| // |- - - - - - - - -| | |
| // -1 | parameter n | v |
| // -----+-----------------+-------------------------------- |
| // 0 | return addr | ^ ^ |
| // |- - - - - - - - -| | | |
| // 1 | saved frame ptr | Fixed | |
| // |- - - - - - - - -| Header <-- frame ptr | |
| // 2 | [Constant Pool] | | | |
| // |- - - - - - - - -| | | |
| // 2+cp |Context/Frm. Type| v if a constant pool | |
| // |-----------------+---- is used, cp = 1, | |
| // 3+cp | | ^ otherwise, cp = 0 | |
| // |- - - - - - - - -| | | |
| // 4+cp | | | Callee |
| // |- - - - - - - - -| | frame slots |
| // ... | | Frame slots (slot >= 0) |
| // |- - - - - - - - -| | | |
| // | | v | |
| // -----+-----------------+----- <-- stack ptr ------------- |
| // |
| class CommonFrameConstants : public AllStatic { |
| public: |
| static constexpr int kCallerFPOffset = 0 * kSystemPointerSize; |
| static constexpr int kCallerPCOffset = kCallerFPOffset + 1 * kFPOnStackSize; |
| static constexpr int kCallerSPOffset = kCallerPCOffset + 1 * kPCOnStackSize; |
| |
| // Fixed part of the frame consists of return address, caller fp, |
| // constant pool (if FLAG_enable_embedded_constant_pool), context, and |
| // function. StandardFrame::IterateExpressions assumes that kLastObjectOffset |
| // is the last object pointer. |
| static constexpr int kFixedFrameSizeAboveFp = kPCOnStackSize + kFPOnStackSize; |
| static constexpr int kFixedSlotCountAboveFp = |
| kFixedFrameSizeAboveFp / kSystemPointerSize; |
| static constexpr int kCPSlotSize = |
| FLAG_enable_embedded_constant_pool ? kSystemPointerSize : 0; |
| static constexpr int kCPSlotCount = kCPSlotSize / kSystemPointerSize; |
| static constexpr int kConstantPoolOffset = |
| kCPSlotSize ? -1 * kSystemPointerSize : 0; |
| static constexpr int kContextOrFrameTypeSize = kSystemPointerSize; |
| static constexpr int kContextOrFrameTypeOffset = |
| -(kCPSlotSize + kContextOrFrameTypeSize); |
| }; |
| |
| // StandardFrames are used for interpreted and optimized JavaScript |
| // frames. They always have a context below the saved fp/constant |
| // pool, below that the JSFunction of the executing function and below that an |
| // integer (not a Smi) containing the actual number of arguments passed to the |
| // JavaScript code. |
| // |
| // slot JS frame |
| // +-----------------+-------------------------------- |
| // -n-1 | parameter 0 | ^ |
| // |- - - - - - - - -| | |
| // -n | | Caller |
| // ... | ... | frame slots |
| // -2 | parameter n-1 | (slot < 0) |
| // |- - - - - - - - -| | |
| // -1 | parameter n | v |
| // -----+-----------------+-------------------------------- |
| // 0 | return addr | ^ ^ |
| // |- - - - - - - - -| | | |
| // 1 | saved frame ptr | Fixed | |
| // |- - - - - - - - -| Header <-- frame ptr | |
| // 2 | [Constant Pool] | | | |
| // |- - - - - - - - -| | | |
| // 2+cp | Context | | if a constant pool | |
| // |- - - - - - - - -| | is used, cp = 1, | |
| // 3+cp | JSFunction | | otherwise, cp = 0 | |
| // |- - - - - - - - -| | | |
| // 4+cp | argc | v | |
| // +-----------------+---- | |
| // 5+cp | | ^ Callee |
| // |- - - - - - - - -| | frame slots |
| // ... | | Frame slots (slot >= 0) |
| // |- - - - - - - - -| | | |
| // | | v | |
| // -----+-----------------+----- <-- stack ptr ------------- |
| // |
| class StandardFrameConstants : public CommonFrameConstants { |
| public: |
| static constexpr int kFixedFrameSizeFromFp = |
| 3 * kSystemPointerSize + kCPSlotSize; |
| static constexpr int kFixedFrameSize = |
| kFixedFrameSizeAboveFp + kFixedFrameSizeFromFp; |
| static constexpr int kFixedSlotCountFromFp = |
| kFixedFrameSizeFromFp / kSystemPointerSize; |
| static constexpr int kFixedSlotCount = kFixedFrameSize / kSystemPointerSize; |
| static constexpr int kContextOffset = kContextOrFrameTypeOffset; |
| static constexpr int kFunctionOffset = -2 * kSystemPointerSize - kCPSlotSize; |
| static constexpr int kArgCOffset = -3 * kSystemPointerSize - kCPSlotSize; |
| static constexpr int kExpressionsOffset = |
| -4 * kSystemPointerSize - kCPSlotSize; |
| static constexpr int kLastObjectOffset = kContextOffset; |
| }; |
| |
| // TypedFrames have a type maker value below the saved FP/constant pool to |
| // distinguish them from StandardFrames, which have a context in that position |
| // instead. |
| // |
| // slot JS frame |
| // +-----------------+-------------------------------- |
| // -n-1 | parameter 0 | ^ |
| // |- - - - - - - - -| | |
| // -n | | Caller |
| // ... | ... | frame slots |
| // -2 | parameter n-1 | (slot < 0) |
| // |- - - - - - - - -| | |
| // -1 | parameter n | v |
| // -----+-----------------+-------------------------------- |
| // 0 | return addr | ^ ^ |
| // |- - - - - - - - -| | | |
| // 1 | saved frame ptr | Fixed | |
| // |- - - - - - - - -| Header <-- frame ptr | |
| // 2 | [Constant Pool] | | | |
| // |- - - - - - - - -| | | |
| // 2+cp |Frame Type Marker| v if a constant pool | |
| // |-----------------+---- is used, cp = 1, | |
| // 3+cp | | ^ otherwise, cp = 0 | |
| // |- - - - - - - - -| | | |
| // 4+cp | | | Callee |
| // |- - - - - - - - -| | frame slots |
| // ... | | Frame slots (slot >= 0) |
| // |- - - - - - - - -| | | |
| // | | v | |
| // -----+-----------------+----- <-- stack ptr ------------- |
| // |
| class TypedFrameConstants : public CommonFrameConstants { |
| public: |
| static constexpr int kFrameTypeSize = kContextOrFrameTypeSize; |
| static constexpr int kFrameTypeOffset = kContextOrFrameTypeOffset; |
| static constexpr int kFixedFrameSizeFromFp = kCPSlotSize + kFrameTypeSize; |
| static constexpr int kFixedSlotCountFromFp = |
| kFixedFrameSizeFromFp / kSystemPointerSize; |
| static constexpr int kFixedFrameSize = |
| StandardFrameConstants::kFixedFrameSizeAboveFp + kFixedFrameSizeFromFp; |
| static constexpr int kFixedSlotCount = kFixedFrameSize / kSystemPointerSize; |
| static constexpr int kFirstPushedFrameValueOffset = |
| -kFixedFrameSizeFromFp - kSystemPointerSize; |
| }; |
| |
| #define TYPED_FRAME_PUSHED_VALUE_OFFSET(x) \ |
| (TypedFrameConstants::kFirstPushedFrameValueOffset - (x)*kSystemPointerSize) |
| #define TYPED_FRAME_SIZE(count) \ |
| (TypedFrameConstants::kFixedFrameSize + (count)*kSystemPointerSize) |
| #define TYPED_FRAME_SIZE_FROM_FP(count) \ |
| (TypedFrameConstants::kFixedFrameSizeFromFp + (count)*kSystemPointerSize) |
| #define DEFINE_TYPED_FRAME_SIZES(count) \ |
| static constexpr int kFixedFrameSize = TYPED_FRAME_SIZE(count); \ |
| static constexpr int kFixedSlotCount = kFixedFrameSize / kSystemPointerSize; \ |
| static constexpr int kFixedFrameSizeFromFp = \ |
| TYPED_FRAME_SIZE_FROM_FP(count); \ |
| static constexpr int kFixedSlotCountFromFp = \ |
| kFixedFrameSizeFromFp / kSystemPointerSize |
| |
| class ArgumentsAdaptorFrameConstants : public TypedFrameConstants { |
| public: |
| // FP-relative. |
| static constexpr int kFunctionOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| static constexpr int kLengthOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); |
| static constexpr int kPaddingOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(2); |
| DEFINE_TYPED_FRAME_SIZES(3); |
| }; |
| |
| class BuiltinFrameConstants : public TypedFrameConstants { |
| public: |
| // FP-relative. |
| static constexpr int kFunctionOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| static constexpr int kLengthOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); |
| DEFINE_TYPED_FRAME_SIZES(2); |
| }; |
| |
| class ConstructFrameConstants : public TypedFrameConstants { |
| public: |
| // FP-relative. |
| static constexpr int kContextOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| static constexpr int kLengthOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); |
| static constexpr int kConstructorOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(2); |
| static constexpr int kPaddingOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(3); |
| static constexpr int kNewTargetOrImplicitReceiverOffset = |
| TYPED_FRAME_PUSHED_VALUE_OFFSET(4); |
| DEFINE_TYPED_FRAME_SIZES(5); |
| }; |
| |
| class CWasmEntryFrameConstants : public TypedFrameConstants { |
| public: |
| // FP-relative: |
| static constexpr int kCEntryFPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| DEFINE_TYPED_FRAME_SIZES(1); |
| }; |
| |
| class WasmFrameConstants : public TypedFrameConstants { |
| public: |
| // FP-relative. |
| static constexpr int kWasmInstanceOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| DEFINE_TYPED_FRAME_SIZES(1); |
| }; |
| |
| class WasmExitFrameConstants : public WasmFrameConstants { |
| public: |
| // FP-relative. |
| static const int kCallingPCOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); |
| DEFINE_TYPED_FRAME_SIZES(2); |
| }; |
| |
| class BuiltinContinuationFrameConstants : public TypedFrameConstants { |
| public: |
| // FP-relative. |
| static constexpr int kFunctionOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| static constexpr int kFrameSPtoFPDeltaAtDeoptimize = |
| TYPED_FRAME_PUSHED_VALUE_OFFSET(1); |
| static constexpr int kBuiltinContextOffset = |
| TYPED_FRAME_PUSHED_VALUE_OFFSET(2); |
| static constexpr int kBuiltinIndexOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(3); |
| |
| // The argument count is in the first allocatable register, stored below the |
| // fixed part of the frame and therefore is not part of the fixed frame size. |
| static constexpr int kArgCOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(4); |
| DEFINE_TYPED_FRAME_SIZES(4); |
| |
| // Returns the number of padding stack slots needed when we have |
| // 'register_count' register slots. |
| // This is needed on some architectures to ensure the stack pointer is |
| // aligned. |
| static int PaddingSlotCount(int register_count); |
| }; |
| |
| class ExitFrameConstants : public TypedFrameConstants { |
| public: |
| static constexpr int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| static constexpr int kLastExitFrameField = kSPOffset; |
| DEFINE_TYPED_FRAME_SIZES(1); |
| |
| // FP-relative displacement of the caller's SP. It points just |
| // below the saved PC. |
| static constexpr int kCallerSPDisplacement = kCallerSPOffset; |
| }; |
| |
| // Behaves like an exit frame but with target and new target args. |
| class BuiltinExitFrameConstants : public CommonFrameConstants { |
| public: |
| static constexpr int kNewTargetOffset = |
| kCallerPCOffset + 1 * kSystemPointerSize; |
| static constexpr int kTargetOffset = |
| kNewTargetOffset + 1 * kSystemPointerSize; |
| static constexpr int kArgcOffset = kTargetOffset + 1 * kSystemPointerSize; |
| static constexpr int kPaddingOffset = kArgcOffset + 1 * kSystemPointerSize; |
| static constexpr int kFirstArgumentOffset = |
| kPaddingOffset + 1 * kSystemPointerSize; |
| static constexpr int kNumExtraArgsWithReceiver = 5; |
| }; |
| |
| class InterpreterFrameConstants : public AllStatic { |
| public: |
| // Fixed frame includes bytecode array and bytecode offset. |
| static constexpr int kFixedFrameSize = |
| StandardFrameConstants::kFixedFrameSize + 2 * kSystemPointerSize; |
| static constexpr int kFixedFrameSizeFromFp = |
| StandardFrameConstants::kFixedFrameSizeFromFp + 2 * kSystemPointerSize; |
| |
| // FP-relative. |
| #ifdef V8_REVERSE_JSARGS |
| static constexpr int kFirstParamFromFp = |
| StandardFrameConstants::kCallerSPOffset; |
| #else |
| static constexpr int kLastParamFromFp = |
| StandardFrameConstants::kCallerSPOffset; |
| #endif |
| static constexpr int kCallerPCOffsetFromFp = |
| StandardFrameConstants::kCallerPCOffset; |
| static constexpr int kBytecodeArrayFromFp = |
| -StandardFrameConstants::kFixedFrameSizeFromFp - 1 * kSystemPointerSize; |
| static constexpr int kBytecodeOffsetFromFp = |
| -StandardFrameConstants::kFixedFrameSizeFromFp - 2 * kSystemPointerSize; |
| static constexpr int kRegisterFileFromFp = |
| -StandardFrameConstants::kFixedFrameSizeFromFp - 3 * kSystemPointerSize; |
| |
| static constexpr int kExpressionsOffset = kRegisterFileFromFp; |
| |
| // Number of fixed slots in addition to a {StandardFrame}. |
| static constexpr int kExtraSlotCount = |
| InterpreterFrameConstants::kFixedFrameSize / kSystemPointerSize - |
| StandardFrameConstants::kFixedFrameSize / kSystemPointerSize; |
| |
| // Expression index for {StandardFrame::GetExpressionAddress}. |
| static constexpr int kBytecodeArrayExpressionIndex = -2; |
| static constexpr int kBytecodeOffsetExpressionIndex = -1; |
| static constexpr int kRegisterFileExpressionIndex = 0; |
| |
| // Returns the number of stack slots needed for 'register_count' registers. |
| // This is needed because some architectures must pad the stack frame with |
| // additional stack slots to ensure the stack pointer is aligned. |
| static int RegisterStackSlotCount(int register_count); |
| }; |
| |
| inline static int FPOffsetToFrameSlot(int frame_offset) { |
| return StandardFrameConstants::kFixedSlotCountAboveFp - 1 - |
| frame_offset / kSystemPointerSize; |
| } |
| |
| inline static int FrameSlotToFPOffset(int slot) { |
| return (StandardFrameConstants::kFixedSlotCountAboveFp - 1 - slot) * |
| kSystemPointerSize; |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #if V8_TARGET_ARCH_IA32 |
| #include "src/execution/ia32/frame-constants-ia32.h" // NOLINT |
| #elif V8_TARGET_ARCH_X64 |
| #include "src/execution/x64/frame-constants-x64.h" // NOLINT |
| #elif V8_TARGET_ARCH_ARM64 |
| #include "src/execution/arm64/frame-constants-arm64.h" // NOLINT |
| #elif V8_TARGET_ARCH_ARM |
| #include "src/execution/arm/frame-constants-arm.h" // NOLINT |
| #elif V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_PPC64 |
| #include "src/execution/ppc/frame-constants-ppc.h" // NOLINT |
| #elif V8_TARGET_ARCH_MIPS |
| #include "src/execution/mips/frame-constants-mips.h" // NOLINT |
| #elif V8_TARGET_ARCH_MIPS64 |
| #include "src/execution/mips64/frame-constants-mips64.h" // NOLINT |
| #elif V8_TARGET_ARCH_S390 |
| #include "src/execution/s390/frame-constants-s390.h" // NOLINT |
| #else |
| #error Unsupported target architecture. |
| #endif |
| |
| #endif // V8_EXECUTION_FRAME_CONSTANTS_H_ |
