| // 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.MoveType; |
| 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.DexType; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| import com.android.tools.r8.ir.optimize.Inliner.Constraint; |
| import com.android.tools.r8.shaking.Enqueuer.AppInfoWithLiveness; |
| |
| public class Return extends JumpInstruction { |
| |
| // Need to keep track of the original return type, as a null value will have MoveType.SINGLE. |
| final private ValueType returnType; |
| |
| public Return() { |
| super(null); |
| returnType = null; |
| } |
| |
| public Return(Value value, ValueType returnType) { |
| super(null, value); |
| assert returnType != ValueType.INT_OR_FLOAT_OR_NULL; |
| this.returnType = returnType; |
| } |
| |
| public boolean isReturnVoid() { |
| return inValues.size() == 0; |
| } |
| |
| public ValueType getReturnType() { |
| return returnType; |
| } |
| |
| public Value returnValue() { |
| assert !isReturnVoid(); |
| return inValues.get(0); |
| } |
| |
| public com.android.tools.r8.code.Instruction createDexInstruction(DexBuilder builder) { |
| if (isReturnVoid()) { |
| return new ReturnVoid(); |
| } else { |
| int register = builder.allocatedRegister(returnValue(), getNumber()); |
| switch (MoveType.fromValueType(returnType)) { |
| case OBJECT: |
| assert returnValue().outType().isObjectOrNull(); |
| return new ReturnObject(register); |
| case SINGLE: |
| assert returnValue().outType().isSingleOrZero(); |
| return new com.android.tools.r8.code.Return(register); |
| case WIDE: |
| assert returnValue().outType().isWide(); |
| return new ReturnWide(register); |
| default: |
| throw new Unreachable(); |
| } |
| } |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| builder.addReturn(this, createDexInstruction(builder)); |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| if (isReturnVoid()) { |
| return other.asReturn().isReturnVoid(); |
| } else { |
| return other.asReturn().returnValue().type == returnValue().type; |
| } |
| } |
| |
| @Override |
| public int compareNonValueParts(Instruction other) { |
| if (isReturnVoid()) { |
| return other.asReturn().isReturnVoid() ? 0 : -1; |
| } else { |
| return returnValue().type.ordinal() - other.asReturn().returnValue().type.ordinal(); |
| } |
| } |
| |
| @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 Constraint inliningConstraint(AppInfoWithLiveness info, DexType invocationContext) { |
| return Constraint.ALWAYS; |
| } |
| |
| @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(returnType)); |
| } |
| } |