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 #ifndef V8_ARM64_DECODER_ARM64_H_ 6 #define V8_ARM64_DECODER_ARM64_H_ 7 8 #include <list> 9 10 #include "src/arm64/instructions-arm64.h" 11 #include "src/globals.h" 12 13 namespace v8 { 14 namespace internal { 15 16 17 // List macro containing all visitors needed by the decoder class. 18 19 #define VISITOR_LIST(V) \ 20 V(PCRelAddressing) \ 21 V(AddSubImmediate) \ 22 V(LogicalImmediate) \ 23 V(MoveWideImmediate) \ 24 V(Bitfield) \ 25 V(Extract) \ 26 V(UnconditionalBranch) \ 27 V(UnconditionalBranchToRegister) \ 28 V(CompareBranch) \ 29 V(TestBranch) \ 30 V(ConditionalBranch) \ 31 V(System) \ 32 V(Exception) \ 33 V(LoadStorePairPostIndex) \ 34 V(LoadStorePairOffset) \ 35 V(LoadStorePairPreIndex) \ 36 V(LoadLiteral) \ 37 V(LoadStoreUnscaledOffset) \ 38 V(LoadStorePostIndex) \ 39 V(LoadStorePreIndex) \ 40 V(LoadStoreRegisterOffset) \ 41 V(LoadStoreUnsignedOffset) \ 42 V(LoadStoreAcquireRelease) \ 43 V(LogicalShifted) \ 44 V(AddSubShifted) \ 45 V(AddSubExtended) \ 46 V(AddSubWithCarry) \ 47 V(ConditionalCompareRegister) \ 48 V(ConditionalCompareImmediate) \ 49 V(ConditionalSelect) \ 50 V(DataProcessing1Source) \ 51 V(DataProcessing2Source) \ 52 V(DataProcessing3Source) \ 53 V(FPCompare) \ 54 V(FPConditionalCompare) \ 55 V(FPConditionalSelect) \ 56 V(FPImmediate) \ 57 V(FPDataProcessing1Source) \ 58 V(FPDataProcessing2Source) \ 59 V(FPDataProcessing3Source) \ 60 V(FPIntegerConvert) \ 61 V(FPFixedPointConvert) \ 62 V(Unallocated) \ 63 V(Unimplemented) 64 65 // The Visitor interface. Disassembler and simulator (and other tools) 66 // must provide implementations for all of these functions. 67 class DecoderVisitor { 68 public: 69 virtual ~DecoderVisitor() {} 70 71 #define DECLARE(A) virtual void Visit##A(Instruction* instr) = 0; 72 VISITOR_LIST(DECLARE) 73 #undef DECLARE 74 }; 75 76 77 // A visitor that dispatches to a list of visitors. 78 class DispatchingDecoderVisitor : public DecoderVisitor { 79 public: 80 DispatchingDecoderVisitor() {} 81 virtual ~DispatchingDecoderVisitor() {} 82 83 // Register a new visitor class with the decoder. 84 // Decode() will call the corresponding visitor method from all registered 85 // visitor classes when decoding reaches the leaf node of the instruction 86 // decode tree. 87 // Visitors are called in the order. 88 // A visitor can only be registered once. 89 // Registering an already registered visitor will update its position. 90 // 91 // d.AppendVisitor(V1); 92 // d.AppendVisitor(V2); 93 // d.PrependVisitor(V2); // Move V2 at the start of the list. 94 // d.InsertVisitorBefore(V3, V2); 95 // d.AppendVisitor(V4); 96 // d.AppendVisitor(V4); // No effect. 97 // 98 // d.Decode(i); 99 // 100 // will call in order visitor methods in V3, V2, V1, V4. 101 void AppendVisitor(DecoderVisitor* visitor); 102 void PrependVisitor(DecoderVisitor* visitor); 103 void InsertVisitorBefore(DecoderVisitor* new_visitor, 104 DecoderVisitor* registered_visitor); 105 void InsertVisitorAfter(DecoderVisitor* new_visitor, 106 DecoderVisitor* registered_visitor); 107 108 // Remove a previously registered visitor class from the list of visitors 109 // stored by the decoder. 110 void RemoveVisitor(DecoderVisitor* visitor); 111 112 #define DECLARE(A) void Visit##A(Instruction* instr); 113 VISITOR_LIST(DECLARE) 114 #undef DECLARE 115 116 private: 117 // Visitors are registered in a list. 118 std::list<DecoderVisitor*> visitors_; 119 }; 120 121 122 template<typename V> 123 class Decoder : public V { 124 public: 125 Decoder() {} 126 virtual ~Decoder() {} 127 128 // Top-level instruction decoder function. Decodes an instruction and calls 129 // the visitor functions registered with the Decoder class. 130 virtual void Decode(Instruction *instr); 131 132 private: 133 // Decode the PC relative addressing instruction, and call the corresponding 134 // visitors. 135 // On entry, instruction bits 27:24 = 0x0. 136 void DecodePCRelAddressing(Instruction* instr); 137 138 // Decode the add/subtract immediate instruction, and call the corresponding 139 // visitors. 140 // On entry, instruction bits 27:24 = 0x1. 141 void DecodeAddSubImmediate(Instruction* instr); 142 143 // Decode the branch, system command, and exception generation parts of 144 // the instruction tree, and call the corresponding visitors. 145 // On entry, instruction bits 27:24 = {0x4, 0x5, 0x6, 0x7}. 146 void DecodeBranchSystemException(Instruction* instr); 147 148 // Decode the load and store parts of the instruction tree, and call 149 // the corresponding visitors. 150 // On entry, instruction bits 27:24 = {0x8, 0x9, 0xC, 0xD}. 151 void DecodeLoadStore(Instruction* instr); 152 153 // Decode the logical immediate and move wide immediate parts of the 154 // instruction tree, and call the corresponding visitors. 155 // On entry, instruction bits 27:24 = 0x2. 156 void DecodeLogical(Instruction* instr); 157 158 // Decode the bitfield and extraction parts of the instruction tree, 159 // and call the corresponding visitors. 160 // On entry, instruction bits 27:24 = 0x3. 161 void DecodeBitfieldExtract(Instruction* instr); 162 163 // Decode the data processing parts of the instruction tree, and call the 164 // corresponding visitors. 165 // On entry, instruction bits 27:24 = {0x1, 0xA, 0xB}. 166 void DecodeDataProcessing(Instruction* instr); 167 168 // Decode the floating point parts of the instruction tree, and call the 169 // corresponding visitors. 170 // On entry, instruction bits 27:24 = {0xE, 0xF}. 171 void DecodeFP(Instruction* instr); 172 173 // Decode the Advanced SIMD (NEON) load/store part of the instruction tree, 174 // and call the corresponding visitors. 175 // On entry, instruction bits 29:25 = 0x6. 176 void DecodeAdvSIMDLoadStore(Instruction* instr); 177 178 // Decode the Advanced SIMD (NEON) data processing part of the instruction 179 // tree, and call the corresponding visitors. 180 // On entry, instruction bits 27:25 = 0x7. 181 void DecodeAdvSIMDDataProcessing(Instruction* instr); 182 }; 183 184 185 } // namespace internal 186 } // namespace v8 187 188 #endif // V8_ARM64_DECODER_ARM64_H_ 189
