| // Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| package com.android.tools.r8.ir.code; |
| |
| import com.android.tools.r8.cf.LoadStoreHelper; |
| import com.android.tools.r8.cf.code.CfStackInstruction; |
| import com.android.tools.r8.cf.code.CfStackInstruction.Opcode; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget; |
| import com.android.tools.r8.ir.optimize.InliningConstraints; |
| |
| public class Dup extends Instruction { |
| |
| public Dup(StackValue destBottom, StackValue destTop, Value src) { |
| this(new StackValues(destBottom, destTop), src); |
| } |
| |
| private Dup(StackValues dest, Value src) { |
| super(dest, src); |
| assert src.isValueOnStack() && !(src instanceof StackValues); |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.DUP; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public Value setOutValue(Value newOutValue) { |
| assert newOutValue instanceof StackValues; |
| for (StackValue stackValue : ((StackValues) newOutValue).getStackValues()) { |
| stackValue.definition = this; |
| } |
| return super.setOutValue(newOutValue); |
| } |
| |
| private StackValue[] getStackValues() { |
| return ((StackValues) outValue()).getStackValues(); |
| } |
| |
| public StackValue outBottom() { |
| return getStackValues()[0]; |
| } |
| |
| public StackValue outTop() { |
| return getStackValues()[1]; |
| } |
| |
| public StackValue src() { |
| return (StackValue) inValues.get(0); |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| throw new Unreachable("This classfile-specific IR should not be inserted in the Dex backend."); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| if (this.inValues.get(0).getType().isWidePrimitive()) { |
| builder.add(new CfStackInstruction(Opcode.Dup2), this); |
| } else { |
| builder.add(new CfStackInstruction(Opcode.Dup), this); |
| } |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| return other.isDup(); |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| return 0; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| return inliningConstraints.forDup(); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| // Intentionally empty. Dup is a stack operation. |
| } |
| |
| @Override |
| public boolean hasInvariantOutType() { |
| return false; |
| } |
| |
| @Override |
| public boolean isDup() { |
| return true; |
| } |
| |
| @Override |
| public Dup asDup() { |
| return this; |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, ProgramMethod context) { |
| return false; |
| } |
| } |