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// Copyright 2014, VIXL authors
// 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_EXAMPLES_NON_CONST_VISITOR_H_
#define VIXL_EXAMPLES_NON_CONST_VISITOR_H_
using namespace vixl::aarch64;
class SwitchAddSubRegisterSources : public DecoderVisitor {
public:
SwitchAddSubRegisterSources()
: DecoderVisitor(DecoderVisitor::kNonConstVisitor) {}
// Our visitor switches the register sources for some add and sub instructions
// (not all add and sub instructions). Visitors are listed by the macro
// `VISITOR_LIST` in aarch64/decoder-aarch64.h.
virtual void VisitAddSubShifted(const Instruction* instr) {
int rn = instr->GetRn();
int rm = instr->GetRm();
// Only non-const visitors are allowed to discard constness of the visited
// instruction.
Instruction* mutable_instr = MutableInstruction(instr);
Instr instr_bits = mutable_instr->GetInstructionBits();
// Switch the bitfields for the `rn` and `rm` registers.
instr_bits &= ~(Rn_mask | Rm_mask);
instr_bits |= (rn << Rm_offset) | (rm << Rn_offset);
// Rewrite the instruction.
mutable_instr->SetInstructionBits(instr_bits);
}
// Define the remaining visitors to do nothing.
#define UNUSED_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(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(Crypto2RegSHA) \
V(Crypto3RegSHA) \
V(CryptoAES) \
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)
#define DEFINE_UNUSED_VISITOR(Name) \
virtual void Visit##Name(const Instruction* i) { \
USE(i); /* Prevents compiler warnings about unused variables. */ \
}
UNUSED_VISITOR_LIST(DEFINE_UNUSED_VISITOR)
#undef DEFINE_UNUSED_VISITOR
#undef UNUSED_VISITOR_LIST
};
void GenerateNonConstVisitorTestCode(MacroAssembler* masm);
int64_t RunNonConstVisitorTestGeneratedCode(const Instruction* start_instr);
void ModifyNonConstVisitorTestGeneratedCode(Instruction* start,
Instruction* end);
#endif
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