// Copyright 2014, VIXL authors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of ARM Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef VIXL_EXAMPLES_NON_CONST_VISITOR_H_
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#define VIXL_EXAMPLES_NON_CONST_VISITOR_H_
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#include "aarch64/decoder-aarch64.h"
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#include "aarch64/macro-assembler-aarch64.h"
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using namespace vixl::aarch64;
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class SwitchAddSubRegisterSources : public DecoderVisitor {
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public:
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SwitchAddSubRegisterSources()
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: DecoderVisitor(DecoderVisitor::kNonConstVisitor) {}
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// Our visitor switches the register sources for some add and sub instructions
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// (not all add and sub instructions). Visitors are listed by the macro
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// `VISITOR_LIST` in aarch64/decoder-aarch64.h.
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virtual void VisitAddSubShifted(const Instruction* instr) VIXL_OVERRIDE {
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int rn = instr->GetRn();
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int rm = instr->GetRm();
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// Only non-const visitors are allowed to discard constness of the visited
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// instruction.
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Instruction* mutable_instr = MutableInstruction(instr);
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Instr instr_bits = mutable_instr->GetInstructionBits();
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// Switch the bitfields for the `rn` and `rm` registers.
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instr_bits &= ~(Rn_mask | Rm_mask);
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instr_bits |= (rn << Rm_offset) | (rm << Rn_offset);
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// Rewrite the instruction.
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mutable_instr->SetInstructionBits(instr_bits);
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}
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// Define the remaining visitors to do nothing.
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#define UNUSED_VISITOR_LIST(V) \
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V(PCRelAddressing) \
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V(AddSubImmediate) \
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V(LogicalImmediate) \
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V(MoveWideImmediate) \
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V(Bitfield) \
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V(Extract) \
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V(UnconditionalBranch) \
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V(UnconditionalBranchToRegister) \
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V(CompareBranch) \
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V(TestBranch) \
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V(ConditionalBranch) \
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V(System) \
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V(Exception) \
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V(LoadStorePairPostIndex) \
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V(LoadStorePairOffset) \
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V(LoadStorePairPreIndex) \
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V(LoadStorePairNonTemporal) \
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V(LoadLiteral) \
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V(LoadStoreUnscaledOffset) \
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V(LoadStorePostIndex) \
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V(LoadStorePreIndex) \
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V(LoadStoreRegisterOffset) \
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V(LoadStoreUnsignedOffset) \
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V(LoadStoreExclusive) \
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V(AtomicMemory) \
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V(LogicalShifted) \
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V(AddSubExtended) \
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V(AddSubWithCarry) \
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V(ConditionalCompareRegister) \
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V(ConditionalCompareImmediate) \
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V(ConditionalSelect) \
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V(DataProcessing1Source) \
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V(DataProcessing2Source) \
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V(DataProcessing3Source) \
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V(FPCompare) \
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V(FPConditionalCompare) \
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V(FPConditionalSelect) \
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V(FPImmediate) \
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V(FPDataProcessing1Source) \
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V(FPDataProcessing2Source) \
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V(FPDataProcessing3Source) \
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V(FPIntegerConvert) \
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V(FPFixedPointConvert) \
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V(Crypto2RegSHA) \
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V(Crypto3RegSHA) \
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V(CryptoAES) \
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V(NEON2RegMisc) \
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V(NEON2RegMiscFP16) \
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V(NEON3Different) \
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V(NEON3Same) \
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V(NEON3SameFP16) \
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V(NEONAcrossLanes) \
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V(NEONByIndexedElement) \
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V(NEONCopy) \
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V(NEONExtract) \
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V(NEONLoadStoreMultiStruct) \
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V(NEONLoadStoreMultiStructPostIndex) \
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V(NEONLoadStoreSingleStruct) \
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V(NEONLoadStoreSingleStructPostIndex) \
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V(NEONModifiedImmediate) \
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V(NEONScalar2RegMisc) \
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V(NEONScalar2RegMiscFP16) \
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V(NEONScalar3Diff) \
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V(NEONScalar3Same) \
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V(NEONScalar3SameFP16) \
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V(NEONScalar3SameExtra) \
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V(NEON3SameExtra) \
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V(NEONScalarByIndexedElement) \
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V(NEONScalarCopy) \
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V(NEONScalarPairwise) \
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V(NEONScalarShiftImmediate) \
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V(NEONShiftImmediate) \
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V(NEONTable) \
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V(NEONPerm) \
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V(Unallocated) \
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V(Unimplemented)
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#define DEFINE_UNUSED_VISITOR(Name) \
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virtual void Visit##Name(const Instruction* i) VIXL_OVERRIDE { \
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USE(i); /* Prevents compiler warnings about unused variables. */ \
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}
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UNUSED_VISITOR_LIST(DEFINE_UNUSED_VISITOR)
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#undef DEFINE_UNUSED_VISITOR
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#undef UNUSED_VISITOR_LIST
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};
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void GenerateNonConstVisitorTestCode(MacroAssembler* masm);
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int64_t RunNonConstVisitorTestGeneratedCode(const Instruction* start_instr);
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void ModifyNonConstVisitorTestGeneratedCode(Instruction* start,
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Instruction* end);
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#endif
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