// 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) VIXL_OVERRIDE { 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) VIXL_OVERRIDE { \ 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