| // 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.CfFieldInstruction; |
| import com.android.tools.r8.code.Iput; |
| import com.android.tools.r8.code.IputBoolean; |
| import com.android.tools.r8.code.IputByte; |
| import com.android.tools.r8.code.IputChar; |
| import com.android.tools.r8.code.IputObject; |
| import com.android.tools.r8.code.IputShort; |
| import com.android.tools.r8.code.IputWide; |
| import com.android.tools.r8.dex.Constants; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.DexEncodedField; |
| import com.android.tools.r8.graph.DexField; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.analysis.ClassInitializationAnalysis; |
| import com.android.tools.r8.ir.analysis.ClassInitializationAnalysis.AnalysisAssumption; |
| import com.android.tools.r8.ir.analysis.ClassInitializationAnalysis.Query; |
| 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; |
| import com.android.tools.r8.ir.regalloc.RegisterAllocator; |
| import com.android.tools.r8.shaking.AppInfoWithLiveness; |
| import java.util.Arrays; |
| |
| public class InstancePut extends FieldInstruction implements InstanceFieldInstruction { |
| |
| public InstancePut(DexField field, Value object, Value value) { |
| this(field, object, value, false); |
| } |
| |
| // During structural changes, IRCode is not valid from IR building until the point where |
| // several passes, such as the lens code rewriter, has been run. At this point, it can happen, |
| // for example in the context of enum unboxing, that some InstancePut have temporarily |
| // a primitive type as the object. Skip assertions in this case. |
| public static InstancePut createPotentiallyInvalid(DexField field, Value object, Value value) { |
| return new InstancePut(field, object, value, true); |
| } |
| |
| private InstancePut(DexField field, Value object, Value value, boolean skipAssertion) { |
| super(field, null, Arrays.asList(object, value)); |
| if (!skipAssertion) { |
| assert object().verifyCompatible(ValueType.OBJECT); |
| assert value().verifyCompatible(ValueType.fromDexType(field.type)); |
| } |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.INSTANCE_PUT; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public Value object() { |
| return inValues.get(0); |
| } |
| |
| @Override |
| public Value value() { |
| return inValues.get(1); |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| com.android.tools.r8.code.Instruction instruction; |
| int valueRegister = builder.allocatedRegister(value(), getNumber()); |
| int objectRegister = builder.allocatedRegister(object(), getNumber()); |
| DexField field = getField(); |
| switch (getType()) { |
| case INT: |
| case FLOAT: |
| instruction = new Iput(valueRegister, objectRegister, field); |
| break; |
| case LONG: |
| case DOUBLE: |
| instruction = new IputWide(valueRegister, objectRegister, field); |
| break; |
| case OBJECT: |
| instruction = new IputObject(valueRegister, objectRegister, field); |
| break; |
| case BOOLEAN: |
| instruction = new IputBoolean(valueRegister, objectRegister, field); |
| break; |
| case BYTE: |
| instruction = new IputByte(valueRegister, objectRegister, field); |
| break; |
| case CHAR: |
| instruction = new IputChar(valueRegister, objectRegister, field); |
| break; |
| case SHORT: |
| instruction = new IputShort(valueRegister, objectRegister, field); |
| break; |
| default: |
| throw new Unreachable("Unexpected type: " + getType()); |
| } |
| builder.add(this, instruction); |
| } |
| |
| @Override |
| public boolean instructionTypeCanThrow() { |
| return true; |
| } |
| |
| @Override |
| public boolean instructionMayHaveSideEffects( |
| AppView<?> appView, ProgramMethod context, SideEffectAssumption assumption) { |
| if (appView.appInfo().hasLiveness()) { |
| AppView<AppInfoWithLiveness> appViewWithLiveness = appView.withLiveness(); |
| AppInfoWithLiveness appInfoWithLiveness = appViewWithLiveness.appInfo(); |
| |
| if (instructionInstanceCanThrow(appView, context, assumption)) { |
| return true; |
| } |
| |
| DexEncodedField encodedField = |
| appInfoWithLiveness.resolveField(getField()).getResolvedField(); |
| assert encodedField != null : "NoSuchFieldError (resolution failure) should be caught."; |
| |
| if (encodedField.type().isAlwaysNull(appViewWithLiveness)) { |
| return false; |
| } |
| |
| return appInfoWithLiveness.isFieldRead(encodedField) |
| || isStoringObjectWithFinalizer(appViewWithLiveness, encodedField); |
| } |
| |
| // In D8, we always have to assume that the field can be read, and thus have side effects. |
| return true; |
| } |
| |
| @Override |
| public boolean identicalAfterRegisterAllocation(Instruction other, RegisterAllocator allocator) { |
| if (!super.identicalAfterRegisterAllocation(other, allocator)) { |
| return false; |
| } |
| |
| if (allocator.options().canHaveIncorrectJoinForArrayOfInterfacesBug()) { |
| InstancePut instancePut = other.asInstancePut(); |
| |
| // If the value being written by this instruction is an array, then make sure that the value |
| // being written by the other instruction is the exact same value. Otherwise, the verifier |
| // may incorrectly join the types of these arrays to Object[]. |
| if (value().getType().isArrayType() && value() != instancePut.value()) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| if (!other.isInstancePut()) { |
| return false; |
| } |
| InstancePut o = other.asInstancePut(); |
| return o.getField() == getField() && o.getType() == getType(); |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| return Constants.U4BIT_MAX; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| assert false : "InstancePut instructions define no values."; |
| return 0; |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| return inliningConstraints.forInstancePut(getField(), context.getHolder()); |
| } |
| |
| @Override |
| public boolean isInstanceFieldInstruction() { |
| return true; |
| } |
| |
| @Override |
| public InstanceFieldInstruction asInstanceFieldInstruction() { |
| return this; |
| } |
| |
| @Override |
| public boolean isInstancePut() { |
| return true; |
| } |
| |
| @Override |
| public InstancePut asInstancePut() { |
| return this; |
| } |
| |
| @Override |
| public String toString() { |
| return super.toString() + "; field: " + getField().toSourceString(); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| helper.loadInValues(this, it); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| builder.add( |
| new CfFieldInstruction( |
| org.objectweb.asm.Opcodes.PUTFIELD, getField(), builder.resolveField(getField()))); |
| } |
| |
| @Override |
| public boolean throwsNpeIfValueIsNull(Value value, AppView<?> appView, ProgramMethod context) { |
| return object() == value; |
| } |
| |
| @Override |
| public boolean throwsOnNullInput() { |
| return true; |
| } |
| |
| @Override |
| public Value getNonNullInput() { |
| return object(); |
| } |
| |
| @Override |
| public boolean definitelyTriggersClassInitialization( |
| DexType clazz, |
| ProgramMethod context, |
| AppView<AppInfoWithLiveness> appView, |
| Query mode, |
| AnalysisAssumption assumption) { |
| return ClassInitializationAnalysis.InstructionUtils.forInstancePut( |
| this, clazz, appView, mode, assumption); |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, ProgramMethod context) { |
| return false; |
| } |
| } |