+++ /dev/null
-// Copyright 2013, ARM Limited
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// * Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above copyright notice,
-// this list of conditions and the following disclaimer in the documentation
-// and/or other materials provided with the distribution.
-// * Neither the name of ARM Limited nor the names of its contributors may be
-// used to endorse or promote products derived from this software without
-// specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
-// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
-// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef VIXL_A64_DECODER_A64_H_
-#define VIXL_A64_DECODER_A64_H_
-
-#include <list>
-
-#include "globals.h"
-#include "a64/instructions-a64.h"
-
-
-// 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(LoadStorePairNonTemporal) \
- V(LoadLiteral) \
- V(LoadStoreUnscaledOffset) \
- V(LoadStorePostIndex) \
- V(LoadStorePreIndex) \
- V(LoadStoreRegisterOffset) \
- V(LoadStoreUnsignedOffset) \
- V(LoadStoreExclusive) \
- 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(Unallocated) \
- V(Unimplemented)
-
-namespace vixl {
-
-// The Visitor interface. Disassembler and simulator (and other tools)
-// must provide implementations for all of these functions.
-class DecoderVisitor {
- public:
- enum VisitorConstness {
- kConstVisitor,
- kNonConstVisitor
- };
- explicit DecoderVisitor(VisitorConstness constness = kConstVisitor)
- : constness_(constness) {}
-
- virtual ~DecoderVisitor() {}
-
- #define DECLARE(A) virtual void Visit##A(const Instruction* instr) = 0;
- VISITOR_LIST(DECLARE)
- #undef DECLARE
-
- bool IsConstVisitor() const { return constness_ == kConstVisitor; }
- Instruction* MutableInstruction(const Instruction* instr) {
- VIXL_ASSERT(!IsConstVisitor());
- return const_cast<Instruction*>(instr);
- }
-
- private:
- const VisitorConstness constness_;
-};
-
-
-class Decoder {
- public:
- Decoder() {}
-
- // Top-level wrappers around the actual decoding function.
- void Decode(const Instruction* instr) {
- std::list<DecoderVisitor*>::iterator it;
- for (it = visitors_.begin(); it != visitors_.end(); it++) {
- VIXL_ASSERT((*it)->IsConstVisitor());
- }
- DecodeInstruction(instr);
- }
- void Decode(Instruction* instr) {
- DecodeInstruction(const_cast<const Instruction*>(instr));
- }
-
- // 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 order.
- // A visitor can be registered multiple times.
- //
- // d.AppendVisitor(V1);
- // d.AppendVisitor(V2);
- // d.PrependVisitor(V2);
- // d.AppendVisitor(V3);
- //
- // d.Decode(i);
- //
- // will call in order visitor methods in V2, V1, V2, V3.
- void AppendVisitor(DecoderVisitor* visitor);
- void PrependVisitor(DecoderVisitor* visitor);
- // These helpers register `new_visitor` before or after the first instance of
- // `registered_visiter` in the list.
- // So if
- // V1, V2, V1, V2
- // are registered in this order in the decoder, calls to
- // d.InsertVisitorAfter(V3, V1);
- // d.InsertVisitorBefore(V4, V2);
- // will yield the order
- // V1, V3, V4, V2, V1, V2
- //
- // For more complex modifications of the order of registered visitors, one can
- // directly access and modify the list of visitors via the `visitors()'
- // accessor.
- void InsertVisitorBefore(DecoderVisitor* new_visitor,
- DecoderVisitor* registered_visitor);
- void InsertVisitorAfter(DecoderVisitor* new_visitor,
- DecoderVisitor* registered_visitor);
-
- // Remove all instances of a previously registered visitor class from the list
- // of visitors stored by the decoder.
- void RemoveVisitor(DecoderVisitor* visitor);
-
- #define DECLARE(A) void Visit##A(const Instruction* instr);
- VISITOR_LIST(DECLARE)
- #undef DECLARE
-
-
- std::list<DecoderVisitor*>* visitors() { return &visitors_; }
-
- private:
- // Decodes an instruction and calls the visitor functions registered with the
- // Decoder class.
- void DecodeInstruction(const Instruction* instr);
-
- // Decode the PC relative addressing instruction, and call the corresponding
- // visitors.
- // On entry, instruction bits 27:24 = 0x0.
- void DecodePCRelAddressing(const Instruction* instr);
-
- // Decode the add/subtract immediate instruction, and call the correspoding
- // visitors.
- // On entry, instruction bits 27:24 = 0x1.
- void DecodeAddSubImmediate(const 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(const 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(const 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(const 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(const 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(const 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(const 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 DecodeAdvSIMDLoadStore(const 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 DecodeAdvSIMDDataProcessing(const Instruction* instr);
-
- private:
- // Visitors are registered in a list.
- std::list<DecoderVisitor*> visitors_;
-};
-
-} // namespace vixl
-
-#endif // VIXL_A64_DECODER_A64_H_
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