// 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_