| // Copyright (c) 2016, 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.CfReturn; |
| import com.android.tools.r8.cf.code.CfReturnVoid; |
| import com.android.tools.r8.code.ReturnObject; |
| import com.android.tools.r8.code.ReturnVoid; |
| import com.android.tools.r8.code.ReturnWide; |
| import com.android.tools.r8.dex.Constants; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.analysis.type.TypeElement; |
| 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 Return extends JumpInstruction { |
| |
| public Return() { |
| super(); |
| } |
| |
| public Return(Value value) { |
| super(value); |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.RETURN; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| public boolean isReturnVoid() { |
| return inValues.size() == 0; |
| } |
| |
| public TypeElement getReturnType() { |
| assert !isReturnVoid(); |
| return returnValue().getType(); |
| } |
| |
| public Value returnValue() { |
| assert !isReturnVoid(); |
| return inValues.get(0); |
| } |
| |
| public com.android.tools.r8.code.Instruction createDexInstruction(DexBuilder builder) { |
| if (isReturnVoid()) { |
| return new ReturnVoid(); |
| } |
| int register = builder.allocatedRegister(returnValue(), getNumber()); |
| TypeElement returnType = getReturnType(); |
| if (returnType.isReferenceType()) { |
| return new ReturnObject(register); |
| } |
| if (returnType.isSinglePrimitive()) { |
| return new com.android.tools.r8.code.Return(register); |
| } |
| if (returnType.isWidePrimitive()) { |
| return new ReturnWide(register); |
| } |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| builder.addReturn(this, createDexInstruction(builder)); |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| if (!other.isReturn()) { |
| return false; |
| } |
| Return o = other.asReturn(); |
| if (isReturnVoid()) { |
| return o.isReturnVoid(); |
| } |
| return getReturnType().isValueTypeCompatible(o.getReturnType()); |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| return Constants.U8BIT_MAX; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| assert false : "Return defines no values."; |
| return 0; |
| } |
| |
| @Override |
| public boolean isReturn() { |
| return true; |
| } |
| |
| @Override |
| public Return asReturn() { |
| return this; |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| return inliningConstraints.forReturn(); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| if (!isReturnVoid()) { |
| helper.loadInValues(this, it); |
| } |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| builder.add( |
| isReturnVoid() ? new CfReturnVoid() : new CfReturn(ValueType.fromType(getReturnType()))); |
| } |
| } |