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dart/sdk/e5e85af5a1141ed11fe2a94de6502ebbcd66ae69/./runtime/vm/constants_kbc.h
blob: 64eebd052fa6d86d9b2f0efe2e6bbecf7f7113b4 [file]
// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_CONSTANTS_KBC_H_
#define RUNTIME_VM_CONSTANTS_KBC_H_
#include "platform/assert.h"
#include "platform/globals.h"
#include "platform/utils.h"
namespace dart {
// clang-format off
// Bytecode instructions are specified using the following format:
//
// V(BytecodeName, OperandForm, BytecodeKind, Op1, Op2, Op3)
//
// - OperandForm specifies operand encoding and should be one of 0, A, D, X, T,
// A_E, A_Y, D_F or A_B_C.
//
// - BytecodeKind is one of WIDE, RESV (reserved), ORDN (ordinary)
//
// - Op1, Op2, Op3 specify operand meaning. Possible values:
//
// ___ ignored / non-existent operand
// num immediate operand
// lit constant literal from object pool
// reg register (unsigned FP relative local)
// xeg x-register (signed FP relative local)
// tgt jump target relative to the PC of the current instruction
//
// TODO(vegorov) jump targets should be encoded relative to PC of the next
// instruction because PC is incremented immediately after fetch
// and before decoding.
//
#define PUBLIC_KERNEL_BYTECODES_LIST(V) \
V(Trap, 0, ORDN, ___, ___, ___) \
V(Dup, 0, ORDN, ___, ___, ___) \
V(Entry, D, ORDN, num, ___, ___) \
V(Entry_Wide, D, WIDE, num, ___, ___) \
V(EntryOptional, A_B_C, ORDN, num, num, num) \
V(EntrySuspendable, A_B_C, ORDN, num, num, num) \
V(LoadConstant, A_E, ORDN, reg, lit, ___) \
V(LoadConstant_Wide, A_E, WIDE, reg, lit, ___) \
V(Frame, D, ORDN, num, ___, ___) \
V(Frame_Wide, D, WIDE, num, ___, ___) \
V(CheckFunctionTypeArgs, A_E, ORDN, num, reg, ___) \
V(CheckFunctionTypeArgs_Wide, A_E, WIDE, num, reg, ___) \
V(CheckStack, A, ORDN, num, ___, ___) \
V(Nop, 0, ORDN, ___, ___, ___) \
V(JumpIfUnchecked, T, ORDN, tgt, ___, ___) \
V(JumpIfUnchecked_Wide, T, WIDE, tgt, ___, ___) \
V(Allocate, D, ORDN, lit, ___, ___) \
V(Allocate_Wide, D, WIDE, lit, ___, ___) \
V(AllocateT, 0, ORDN, ___, ___, ___) \
V(CreateArrayTOS, 0, ORDN, ___, ___, ___) \
V(AllocateClosure, D, ORDN, lit, ___, ___) \
V(AllocateClosure_Wide, D, WIDE, lit, ___, ___) \
V(LoadClosureElement, D, ORDN, num, ___, ___) \
V(LoadClosureElement_Wide, D, WIDE, num, ___, ___) \
V(StoreClosureElement, D, ORDN, num, ___, ___) \
V(StoreClosureElement_Wide, D, WIDE, num, ___, ___) \
V(AllocateContext, A_E, ORDN, num, num, ___) \
V(AllocateContext_Wide, A_E, WIDE, num, num, ___) \
V(CloneContext, A_E, ORDN, num, num, ___) \
V(CloneContext_Wide, A_E, WIDE, num, num, ___) \
V(LoadContextParent, 0, ORDN, ___, ___, ___) \
V(StoreContextParent, 0, ORDN, ___, ___, ___) \
V(LoadContextVar, A_E, ORDN, num, num, ___) \
V(LoadContextVar_Wide, A_E, WIDE, num, num, ___) \
V(Unused04, 0, RESV, ___, ___, ___) \
V(Unused05, 0, RESV, ___, ___, ___) \
V(StoreContextVar, A_E, ORDN, num, num, ___) \
V(StoreContextVar_Wide, A_E, WIDE, num, num, ___) \
V(PushConstant, D, ORDN, lit, ___, ___) \
V(PushConstant_Wide, D, WIDE, lit, ___, ___) \
V(Unused06, 0, RESV, ___, ___, ___) \
V(Unused07, 0, RESV, ___, ___, ___) \
V(PushTrue, 0, ORDN, ___, ___, ___) \
V(PushFalse, 0, ORDN, ___, ___, ___) \
V(PushInt, X, ORDN, num, ___, ___) \
V(PushInt_Wide, X, WIDE, num, ___, ___) \
V(Unused08, 0, RESV, ___, ___, ___) \
V(Unused09, 0, RESV, ___, ___, ___) \
V(Unused10, 0, RESV, ___, ___, ___) \
V(Unused11, 0, RESV, ___, ___, ___) \
V(PushNull, 0, ORDN, ___, ___, ___) \
V(Drop1, 0, ORDN, ___, ___, ___) \
V(Push, X, ORDN, xeg, ___, ___) \
V(Push_Wide, X, WIDE, xeg, ___, ___) \
V(Unused12, 0, RESV, ___, ___, ___) \
V(Unused13, 0, RESV, ___, ___, ___) \
V(Unused14, 0, RESV, ___, ___, ___) \
V(Unused15, 0, RESV, ___, ___, ___) \
V(Unused16, 0, RESV, ___, ___, ___) \
V(Unused17, 0, RESV, ___, ___, ___) \
V(PopLocal, X, ORDN, xeg, ___, ___) \
V(PopLocal_Wide, X, WIDE, xeg, ___, ___) \
V(LoadStatic, D, ORDN, lit, ___, ___) \
V(LoadStatic_Wide, D, WIDE, lit, ___, ___) \
V(StoreLocal, X, ORDN, xeg, ___, ___) \
V(StoreLocal_Wide, X, WIDE, xeg, ___, ___) \
V(LoadFieldTOS, D, ORDN, lit, ___, ___) \
V(LoadFieldTOS_Wide, D, WIDE, lit, ___, ___) \
V(StoreFieldTOS, D, ORDN, lit, ___, ___) \
V(StoreFieldTOS_Wide, D, WIDE, lit, ___, ___) \
V(StoreIndexedTOS, 0, ORDN, ___, ___, ___) \
V(Unused20, 0, RESV, ___, ___, ___) \
V(JumpIfInitialized, T, ORDN, tgt, ___, ___) \
V(JumpIfInitialized_Wide, T, WIDE, tgt, ___, ___) \
V(PushUninitializedSentinel, 0, ORDN, ___, ___, ___) \
V(Unused21, 0, RESV, ___, ___, ___) \
V(InitLateField, D, ORDN, lit, ___, ___) \
V(InitLateField_Wide, D, WIDE, lit, ___, ___) \
V(StoreStaticTOS, D, ORDN, lit, ___, ___) \
V(StoreStaticTOS_Wide, D, WIDE, lit, ___, ___) \
V(Jump, T, ORDN, tgt, ___, ___) \
V(Jump_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfNoAsserts, T, ORDN, tgt, ___, ___) \
V(JumpIfNoAsserts_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfNotZeroTypeArgs, T, ORDN, tgt, ___, ___) \
V(JumpIfNotZeroTypeArgs_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfEqStrict, T, ORDN, tgt, ___, ___) \
V(JumpIfEqStrict_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfNeStrict, T, ORDN, tgt, ___, ___) \
V(JumpIfNeStrict_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfTrue, T, ORDN, tgt, ___, ___) \
V(JumpIfTrue_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfFalse, T, ORDN, tgt, ___, ___) \
V(JumpIfFalse_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfNull, T, ORDN, tgt, ___, ___) \
V(JumpIfNull_Wide, T, WIDE, tgt, ___, ___) \
V(JumpIfNotNull, T, ORDN, tgt, ___, ___) \
V(JumpIfNotNull_Wide, T, WIDE, tgt, ___, ___) \
V(Suspend, T, ORDN, tgt, ___, ___) \
V(Suspend_Wide, T, WIDE, tgt, ___, ___) \
V(DirectCall, D_F, ORDN, num, num, ___) \
V(DirectCall_Wide, D_F, WIDE, num, num, ___) \
V(UncheckedDirectCall, D_F, ORDN, num, num, ___) \
V(UncheckedDirectCall_Wide, D_F, WIDE, num, num, ___) \
V(InterfaceCall, D_F, ORDN, num, num, ___) \
V(InterfaceCall_Wide, D_F, WIDE, num, num, ___) \
V(ExternalCall, D, ORDN, lit, ___, ___) \
V(ExternalCall_Wide, D, WIDE, lit, ___, ___) \
V(InstantiatedInterfaceCall, D_F, ORDN, num, num, ___) \
V(InstantiatedInterfaceCall_Wide, D_F, WIDE, num, num, ___) \
V(UncheckedClosureCall, D_F, ORDN, num, num, ___) \
V(UncheckedClosureCall_Wide, D_F, WIDE, num, num, ___) \
V(UncheckedInterfaceCall, D_F, ORDN, num, num, ___) \
V(UncheckedInterfaceCall_Wide, D_F, WIDE, num, num, ___) \
V(DynamicCall, D_F, ORDN, num, num, ___) \
V(DynamicCall_Wide, D_F, WIDE, num, num, ___) \
V(ReturnTOS, 0, ORDN, ___, ___, ___) \
V(Unused25, 0, RESV, ___, ___, ___) \
V(AssertAssignable, A_E, ORDN, num, lit, ___) \
V(AssertAssignable_Wide, A_E, WIDE, num, lit, ___) \
V(AssertSubtype, 0, ORDN, ___, ___, ___) \
V(Unused30, 0, RESV, ___, ___, ___) \
V(LoadTypeArgumentsField, D, ORDN, lit, ___, ___) \
V(LoadTypeArgumentsField_Wide, D, WIDE, lit, ___, ___) \
V(InstantiateType, D, ORDN, lit, ___, ___) \
V(InstantiateType_Wide, D, WIDE, lit, ___, ___) \
V(InstantiateTypeArgumentsTOS, A_E, ORDN, num, lit, ___) \
V(InstantiateTypeArgumentsTOS_Wide, A_E, WIDE, num, lit, ___) \
V(Unused32, 0, RESV, ___, ___, ___) \
V(Unused33, 0, RESV, ___, ___, ___) \
V(Unused34, 0, RESV, ___, ___, ___) \
V(Unused35, 0, RESV, ___, ___, ___) \
V(Throw, A, ORDN, num, ___, ___) \
V(SetFrame, A, ORDN, num, ___, num) \
V(MoveSpecial, A_Y, ORDN, num, xeg, ___) \
V(MoveSpecial_Wide, A_Y, WIDE, num, xeg, ___) \
V(BooleanNegateTOS, 0, ORDN, ___, ___, ___) \
V(EqualsNull, 0, ORDN, ___, ___, ___) \
V(NullCheck, D, ORDN, lit, ___, ___) \
V(NullCheck_Wide, D, WIDE, lit, ___, ___) \
V(NegateInt, 0, ORDN, ___, ___, ___) \
V(AddInt, 0, ORDN, ___, ___, ___) \
V(SubInt, 0, ORDN, ___, ___, ___) \
V(MulInt, 0, ORDN, ___, ___, ___) \
V(TruncDivInt, 0, ORDN, ___, ___, ___) \
V(ModInt, 0, ORDN, ___, ___, ___) \
V(BitAndInt, 0, ORDN, ___, ___, ___) \
V(BitOrInt, 0, ORDN, ___, ___, ___) \
V(BitXorInt, 0, ORDN, ___, ___, ___) \
V(ShlInt, 0, ORDN, ___, ___, ___) \
V(ShrInt, 0, ORDN, ___, ___, ___) \
V(CompareIntEq, 0, ORDN, ___, ___, ___) \
V(CompareIntGt, 0, ORDN, ___, ___, ___) \
V(CompareIntLt, 0, ORDN, ___, ___, ___) \
V(CompareIntGe, 0, ORDN, ___, ___, ___) \
V(CompareIntLe, 0, ORDN, ___, ___, ___) \
V(NegateDouble, 0, ORDN, ___, ___, ___) \
V(AddDouble, 0, ORDN, ___, ___, ___) \
V(SubDouble, 0, ORDN, ___, ___, ___) \
V(MulDouble, 0, ORDN, ___, ___, ___) \
V(DivDouble, 0, ORDN, ___, ___, ___) \
V(CompareDoubleEq, 0, ORDN, ___, ___, ___) \
V(CompareDoubleGt, 0, ORDN, ___, ___, ___) \
V(CompareDoubleLt, 0, ORDN, ___, ___, ___) \
V(CompareDoubleGe, 0, ORDN, ___, ___, ___) \
V(CompareDoubleLe, 0, ORDN, ___, ___, ___) \
V(AllocateRecord, D, ORDN, lit, ___, ___) \
V(AllocateRecord_Wide, D, WIDE, lit, ___, ___) \
V(LoadRecordField, D, ORDN, num, ___, ___) \
V(LoadRecordField_Wide, D, WIDE, num, ___, ___) \
V(FfiCall, D, ORDN, lit, ___, ___) \
V(FfiCall_Wide, D, WIDE, lit, ___, ___) \
V(RecordCoverage, A_E, ORDN, num, num, ___) \
V(RecordCoverage_Wide, A_E, WIDE, num, num, ___) \
V(ResolveNativeFunction, D, ORDN, lit, ___, ___) \
V(ResolveNativeFunction_Wide, D, WIDE, lit, ___, ___) \
// These bytecodes are only generated within the VM. Reassigning their
// opcodes is not a breaking change.
#define INTERNAL_KERNEL_BYTECODES_WITH_CUSTOM_CODE(V) \
/* ImplicitConstructorClosure and ImplicitInstanceClosure instructions */ \
/* use D_F encoding as they may call target constructor or method and */ \
/* should be compatible with other ***Call instructions */ \
/* in order to support DecodeArgc when returning from a call. */ \
V(VMInternal_ImplicitConstructorClosure, D_F, ORDN, num, num, ___) \
V(VMInternal_ImplicitConstructorClosure_Wide, D_F, ORDN, num, num, ___) \
V(VMInternal_ImplicitInstanceClosure, D_F, ORDN, num, num, ___) \
V(VMInternal_ImplicitInstanceClosure_Wide, D_F, ORDN, num, num, ___) \
#define INTERNAL_KERNEL_BYTECODES_WITH_DEFAULT_CODE(V) \
V(VMInternal_ImplicitGetter, 0, ORDN, ___, ___, ___) \
V(VMInternal_ImplicitSetter, 0, ORDN, ___, ___, ___) \
V(VMInternal_ImplicitStaticGetter, 0, ORDN, ___, ___, ___) \
V(VMInternal_ImplicitSharedStaticGetter, 0, ORDN, ___, ___, ___) \
V(VMInternal_ImplicitStaticSetter, 0, ORDN, ___, ___, ___) \
V(VMInternal_ImplicitSharedStaticSetter, 0, ORDN, ___, ___, ___) \
V(VMInternal_MethodExtractorWithITA, 0, ORDN, ___, ___, ___) \
V(VMInternal_MethodExtractorWithoutITA, 0, ORDN, ___, ___, ___) \
V(VMInternal_InvokeClosure, 0, ORDN, ___, ___, ___) \
V(VMInternal_InvokeField, 0, ORDN, ___, ___, ___) \
V(VMInternal_ForwardDynamicInvocation, 0, ORDN, ___, ___, ___) \
V(VMInternal_ImplicitStaticClosure, 0, ORDN, ___, ___, ___) \
V(VMInternal_NoSuchMethodDispatcher, 0, ORDN, ___, ___, ___) \
// One breakpoint opcode for each instruction size.
#define INTERNAL_KERNEL_BREAKPOINT_BYTECODES(V) \
V(VMInternal_Breakpoint_0, 0, ORDN, ___, ___, ___) \
V(VMInternal_Breakpoint_A_B_C, A_B_C, ORDN, num, num, num) \
V(VMInternal_Breakpoint_D, D, ORDN, num, ___, ___) \
V(VMInternal_Breakpoint_D_Wide, D, WIDE, num, ___, ___) \
V(VMInternal_Breakpoint_A_E, A_E, ORDN, num, num, ___) \
V(VMInternal_Breakpoint_A_E_Wide, A_E, WIDE, num, num, ___) \
#define INTERNAL_KERNEL_BYTECODES_LIST_WITH_NO_BREAKPOINTS(V) \
INTERNAL_KERNEL_BYTECODES_WITH_CUSTOM_CODE(V) \
INTERNAL_KERNEL_BYTECODES_WITH_DEFAULT_CODE(V)
#define INTERNAL_KERNEL_BYTECODES_LIST(V) \
INTERNAL_KERNEL_BYTECODES_LIST_WITH_NO_BREAKPOINTS(V) \
INTERNAL_KERNEL_BREAKPOINT_BYTECODES(V)
#define KERNEL_BYTECODES_LIST_WITH_NO_BREAKPOINTS(V) \
PUBLIC_KERNEL_BYTECODES_LIST(V) \
INTERNAL_KERNEL_BYTECODES_LIST_WITH_NO_BREAKPOINTS(V)
#define KERNEL_BYTECODES_LIST(V) \
PUBLIC_KERNEL_BYTECODES_LIST(V) \
INTERNAL_KERNEL_BYTECODES_LIST(V)
// clang-format on
typedef uint8_t KBCInstr;
class KernelBytecode {
public:
// Magic value of bytecode files.
static const intptr_t kMagicValue = 0x44424333; // 'DBC3'
// Bytecode format version supported by the VM
// (should match pkg/dart2bytecode/lib/dbc.dart).
static const intptr_t kBytecodeFormatVersion = 3;
enum Opcode {
#define DECLARE_BYTECODE(name, encoding, kind, op1, op2, op3) k##name,
KERNEL_BYTECODES_LIST(DECLARE_BYTECODE)
#undef DECLARE_BYTECODE
kNumOpcodes,
};
static const char* NameOf(Opcode op) {
const char* names[] = {
#define NAME(name, encoding, kind, op1, op2, op3) #name,
KERNEL_BYTECODES_LIST(NAME)
#undef NAME
};
return names[op];
}
static const intptr_t kMaxInstructionSize = 6;
static const intptr_t kInstructionSize[];
enum SpecialIndex {
kExceptionSpecialIndex,
kStackTraceSpecialIndex,
kSpecialIndexCount
};
private:
static const intptr_t kWideModifier = 1;
// Should be used only on instructions with wide variants.
DART_FORCE_INLINE static bool IsWide(const KBCInstr* instr) {
return IsWide(DecodeOpcode(instr));
}
// Should be used only on instructions with wide variants.
DART_FORCE_INLINE static constexpr bool IsWide(Opcode opcode) {
return ((opcode & kWideModifier) != 0);
}
public:
DART_FORCE_INLINE static uint8_t DecodeA(const KBCInstr* bc) { return bc[1]; }
DART_FORCE_INLINE static uint8_t DecodeB(const KBCInstr* bc) { return bc[2]; }
DART_FORCE_INLINE static uint8_t DecodeC(const KBCInstr* bc) { return bc[3]; }
DART_FORCE_INLINE static uint32_t DecodeD(const KBCInstr* bc) {
if (IsWide(bc)) {
return static_cast<uint32_t>(bc[1]) |
(static_cast<uint32_t>(bc[2]) << 8) |
(static_cast<uint32_t>(bc[3]) << 16) |
(static_cast<uint32_t>(bc[4]) << 24);
} else {
return bc[1];
}
}
DART_FORCE_INLINE static int32_t DecodeX(const KBCInstr* bc) {
if (IsWide(bc)) {
return static_cast<int32_t>(static_cast<uint32_t>(bc[1]) |
(static_cast<uint32_t>(bc[2]) << 8) |
(static_cast<uint32_t>(bc[3]) << 16) |
(static_cast<uint32_t>(bc[4]) << 24));
} else {
return static_cast<int8_t>(bc[1]);
}
}
DART_FORCE_INLINE static int32_t DecodeT(const KBCInstr* bc) {
if (IsWide(bc)) {
return static_cast<int32_t>((static_cast<uint32_t>(bc[1]) << 8) |
(static_cast<uint32_t>(bc[2]) << 16) |
(static_cast<uint32_t>(bc[3]) << 24)) >>
8;
} else {
return static_cast<int8_t>(bc[1]);
}
}
DART_FORCE_INLINE static uint32_t DecodeE(const KBCInstr* bc) {
if (IsWide(bc)) {
return static_cast<uint32_t>(bc[2]) |
(static_cast<uint32_t>(bc[3]) << 8) |
(static_cast<uint32_t>(bc[4]) << 16) |
(static_cast<uint32_t>(bc[5]) << 24);
} else {
return bc[2];
}
}
DART_FORCE_INLINE static int32_t DecodeY(const KBCInstr* bc) {
if (IsWide(bc)) {
return static_cast<int32_t>(static_cast<uint32_t>(bc[2]) |
(static_cast<uint32_t>(bc[3]) << 8) |
(static_cast<uint32_t>(bc[4]) << 16) |
(static_cast<uint32_t>(bc[5]) << 24));
} else {
return static_cast<int8_t>(bc[2]);
}
}
DART_FORCE_INLINE static uint8_t DecodeF(const KBCInstr* bc) {
if (IsWide(bc)) {
return bc[5];
} else {
return bc[2];
}
}
DART_FORCE_INLINE static Opcode DecodeOpcode(const KBCInstr* bc) {
return static_cast<Opcode>(bc[0]);
}
DART_FORCE_INLINE static const KBCInstr* Next(const KBCInstr* bc) {
return bc + kInstructionSize[DecodeOpcode(bc)];
}
DART_FORCE_INLINE static uword Next(uword pc) {
return pc + kInstructionSize[DecodeOpcode(
reinterpret_cast<const KBCInstr*>(pc))];
}
DART_FORCE_INLINE static bool IsLoadConstantOpcode(const KBCInstr* instr) {
switch (DecodeOpcode(instr)) {
case KernelBytecode::kLoadConstant:
case KernelBytecode::kLoadConstant_Wide:
return true;
default:
return false;
}
}
DART_FORCE_INLINE static bool IsCheckStackOpcode(const KBCInstr* instr) {
return DecodeOpcode(instr) == KernelBytecode::kCheckStack;
}
DART_FORCE_INLINE static bool IsCheckFunctionTypeArgs(const KBCInstr* instr) {
switch (DecodeOpcode(instr)) {
case KernelBytecode::kCheckFunctionTypeArgs:
case KernelBytecode::kCheckFunctionTypeArgs_Wide:
return true;
default:
return false;
}
}
DART_FORCE_INLINE static bool IsEntryOpcode(const KBCInstr* instr) {
switch (DecodeOpcode(instr)) {
case KernelBytecode::kEntry:
case KernelBytecode::kEntry_Wide:
return true;
default:
return false;
}
}
DART_FORCE_INLINE static bool IsEntryOptionalOpcode(const KBCInstr* instr) {
return DecodeOpcode(instr) == KernelBytecode::kEntryOptional;
}
DART_FORCE_INLINE static bool IsFrameOpcode(const KBCInstr* instr) {
switch (DecodeOpcode(instr)) {
case KernelBytecode::kFrame:
case KernelBytecode::kFrame_Wide:
return true;
default:
return false;
}
}
DART_FORCE_INLINE static bool IsSetFrameOpcode(const KBCInstr* instr) {
return DecodeOpcode(instr) == KernelBytecode::kSetFrame;
}
DART_FORCE_INLINE static bool IsDirectCallOpcode(const KBCInstr* instr) {
switch (DecodeOpcode(instr)) {
case KernelBytecode::kDirectCall:
case KernelBytecode::kDirectCall_Wide:
case KernelBytecode::kUncheckedDirectCall:
case KernelBytecode::kUncheckedDirectCall_Wide:
return true;
default:
return false;
}
}
DART_FORCE_INLINE static bool IsReturnOpcode(const KBCInstr* instr) {
return DecodeOpcode(instr) == KernelBytecode::kReturnTOS;
}
DART_FORCE_INLINE static bool IsStackManipulationOpcode(
const KBCInstr* instr) {
switch (DecodeOpcode(instr)) {
case KernelBytecode::kDrop1:
case KernelBytecode::kDup:
return true;
default:
return false;
}
}
DART_FORCE_INLINE static uint8_t DecodeArgc(const KBCInstr* ret_addr) {
// All call instructions have DF encoding, with argc being the last byte
// regardless of whether the wide variant is used or not.
return ret_addr[-1];
}
// Converts bytecode PC into an offset.
// For return addresses used in PcDescriptors, PC is also augmented by 1.
// TODO(regis): Eliminate this correction.
static intptr_t BytecodePcToOffset(uint32_t pc, bool is_return_address) {
return pc + (is_return_address ? 1 : 0);
}
static uint32_t OffsetToBytecodePc(intptr_t offset, bool is_return_address) {
return offset - (is_return_address ? 1 : 0);
}
static void GetVMInternalBytecodeInstructions(Opcode opcode,
const KBCInstr** instructions,
intptr_t* instructions_size);
static Opcode BreakpointOpcode(Opcode opcode) {
Opcode replacement;
switch (kInstructionSize[opcode]) {
case 1:
replacement = kVMInternal_Breakpoint_0;
break;
case 2:
replacement = kVMInternal_Breakpoint_D;
break;
case 3:
replacement = kVMInternal_Breakpoint_A_E;
break;
case 4:
replacement = kVMInternal_Breakpoint_A_B_C;
break;
case 5:
replacement = kVMInternal_Breakpoint_D_Wide;
break;
case 6:
replacement = kVMInternal_Breakpoint_A_E_Wide;
break;
default:
UNREACHABLE();
return kTrap;
}
ASSERT_EQUAL(kInstructionSize[replacement], kInstructionSize[opcode]);
return replacement;
}
static Opcode BreakpointOpcode(const KBCInstr* instr) {
return BreakpointOpcode(DecodeOpcode(instr));
}
private:
friend class Interpreter; // for IsWide(Opcode) in static_asserts.
DISALLOW_ALLOCATION();
DISALLOW_IMPLICIT_CONSTRUCTORS(KernelBytecode);
};
} // namespace dart
#endif // RUNTIME_VM_CONSTANTS_KBC_H_