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// Copyright 2013 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_CODEGEN_ARM64_DECODER_ARM64_H_
#define V8_CODEGEN_ARM64_DECODER_ARM64_H_
#include <list>
#include "src/codegen/arm64/instructions-arm64.h"
#include "src/common/globals.h"
namespace v8 {
namespace internal {
// List macro containing all visitors needed by the decoder class.
#define VISITOR_LIST(V) \
V(PCRelAddressing) \
V(AddSubImmediate) \
V(LogicalImmediate) \
V(MoveWideImmediate) \
V(Bitfield) \
V(Extract) \
V(UnconditionalBranch) \
V(UnconditionalBranchToRegister) \
V(CompareBranch) \
V(TestBranch) \
V(ConditionalBranch) \
V(System) \
V(Exception) \
V(LoadStorePairPostIndex) \
V(LoadStorePairOffset) \
V(LoadStorePairPreIndex) \
V(LoadLiteral) \
V(LoadStoreUnscaledOffset) \
V(LoadStorePostIndex) \
V(LoadStorePreIndex) \
V(LoadStoreRegisterOffset) \
V(LoadStoreUnsignedOffset) \
V(LoadStoreAcquireRelease) \
V(LogicalShifted) \
V(AddSubShifted) \
V(AddSubExtended) \
V(AddSubWithCarry) \
V(ConditionalCompareRegister) \
V(ConditionalCompareImmediate) \
V(ConditionalSelect) \
V(DataProcessing1Source) \
V(DataProcessing2Source) \
V(DataProcessing3Source) \
V(FPCompare) \
V(FPConditionalCompare) \
V(FPConditionalSelect) \
V(FPImmediate) \
V(FPDataProcessing1Source) \
V(FPDataProcessing2Source) \
V(FPDataProcessing3Source) \
V(FPIntegerConvert) \
V(FPFixedPointConvert) \
V(NEON2RegMisc) \
V(NEON3Different) \
V(NEON3Same) \
V(NEONAcrossLanes) \
V(NEONByIndexedElement) \
V(NEONCopy) \
V(NEONExtract) \
V(NEONLoadStoreMultiStruct) \
V(NEONLoadStoreMultiStructPostIndex) \
V(NEONLoadStoreSingleStruct) \
V(NEONLoadStoreSingleStructPostIndex) \
V(NEONModifiedImmediate) \
V(NEONScalar2RegMisc) \
V(NEONScalar3Diff) \
V(NEONScalar3Same) \
V(NEONScalarByIndexedElement) \
V(NEONScalarCopy) \
V(NEONScalarPairwise) \
V(NEONScalarShiftImmediate) \
V(NEONShiftImmediate) \
V(NEONTable) \
V(NEONPerm) \
V(Unallocated) \
V(Unimplemented)
// The Visitor interface. Disassembler and simulator (and other tools)
// must provide implementations for all of these functions.
class V8_EXPORT_PRIVATE DecoderVisitor {
public:
virtual ~DecoderVisitor() {}
#define DECLARE(A) virtual void Visit##A(Instruction* instr) = 0;
VISITOR_LIST(DECLARE)
#undef DECLARE
};
// A visitor that dispatches to a list of visitors.
class V8_EXPORT_PRIVATE DispatchingDecoderVisitor : public DecoderVisitor {
public:
DispatchingDecoderVisitor() {}
virtual ~DispatchingDecoderVisitor() {}
// Register a new visitor class with the decoder.
// Decode() will call the corresponding visitor method from all registered
// visitor classes when decoding reaches the leaf node of the instruction
// decode tree.
// Visitors are called in the order.
// A visitor can only be registered once.
// Registering an already registered visitor will update its position.
//
// d.AppendVisitor(V1);
// d.AppendVisitor(V2);
// d.PrependVisitor(V2); // Move V2 at the start of the list.
// d.InsertVisitorBefore(V3, V2);
// d.AppendVisitor(V4);
// d.AppendVisitor(V4); // No effect.
//
// d.Decode(i);
//
// will call in order visitor methods in V3, V2, V1, V4.
void AppendVisitor(DecoderVisitor* visitor);
void PrependVisitor(DecoderVisitor* visitor);
void InsertVisitorBefore(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor);
void InsertVisitorAfter(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor);
// Remove a previously registered visitor class from the list of visitors
// stored by the decoder.
void RemoveVisitor(DecoderVisitor* visitor);
void VisitNEONShiftImmediate(const Instruction* instr);
#define DECLARE(A) void Visit##A(Instruction* instr);
VISITOR_LIST(DECLARE)
#undef DECLARE
private:
// Visitors are registered in a list.
std::list<DecoderVisitor*> visitors_;
};
template <typename V>
class Decoder : public V {
public:
Decoder() {}
virtual ~Decoder() {}
// Top-level instruction decoder function. Decodes an instruction and calls
// the visitor functions registered with the Decoder class.
virtual void Decode(Instruction* instr);
private:
// Decode the PC relative addressing instruction, and call the corresponding
// visitors.
// On entry, instruction bits 27:24 = 0x0.
void DecodePCRelAddressing(Instruction* instr);
// Decode the add/subtract immediate instruction, and call the corresponding
// visitors.
// On entry, instruction bits 27:24 = 0x1.
void DecodeAddSubImmediate(Instruction* instr);
// Decode the branch, system command, and exception generation parts of
// the instruction tree, and call the corresponding visitors.
// On entry, instruction bits 27:24 = {0x4, 0x5, 0x6, 0x7}.
void DecodeBranchSystemException(Instruction* instr);
// Decode the load and store parts of the instruction tree, and call
// the corresponding visitors.
// On entry, instruction bits 27:24 = {0x8, 0x9, 0xC, 0xD}.
void DecodeLoadStore(Instruction* instr);
// Decode the logical immediate and move wide immediate parts of the
// instruction tree, and call the corresponding visitors.
// On entry, instruction bits 27:24 = 0x2.
void DecodeLogical(Instruction* instr);
// Decode the bitfield and extraction parts of the instruction tree,
// and call the corresponding visitors.
// On entry, instruction bits 27:24 = 0x3.
void DecodeBitfieldExtract(Instruction* instr);
// Decode the data processing parts of the instruction tree, and call the
// corresponding visitors.
// On entry, instruction bits 27:24 = {0x1, 0xA, 0xB}.
void DecodeDataProcessing(Instruction* instr);
// Decode the floating point parts of the instruction tree, and call the
// corresponding visitors.
// On entry, instruction bits 27:24 = {0xE, 0xF}.
void DecodeFP(Instruction* instr);
// Decode the Advanced SIMD (NEON) load/store part of the instruction tree,
// and call the corresponding visitors.
// On entry, instruction bits 29:25 = 0x6.
void DecodeNEONLoadStore(Instruction* instr);
// Decode the Advanced SIMD (NEON) data processing part of the instruction
// tree, and call the corresponding visitors.
// On entry, instruction bits 27:25 = 0x7.
void DecodeNEONVectorDataProcessing(Instruction* instr);
// Decode the Advanced SIMD (NEON) scalar data processing part of the
// instruction tree, and call the corresponding visitors.
// On entry, instruction bits 28:25 = 0xF.
void DecodeNEONScalarDataProcessing(Instruction* instr);
};
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_ARM64_DECODER_ARM64_H_