| // 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.Sput; |
| import com.android.tools.r8.code.SputBoolean; |
| import com.android.tools.r8.code.SputByte; |
| import com.android.tools.r8.code.SputChar; |
| import com.android.tools.r8.code.SputObject; |
| import com.android.tools.r8.code.SputShort; |
| import com.android.tools.r8.code.SputWide; |
| 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.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 com.android.tools.r8.shaking.ProguardMemberRule; |
| |
| public class StaticPut extends FieldInstruction { |
| |
| public StaticPut(Value source, DexField field) { |
| super(field, null, source); |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.STATIC_PUT; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public Value value() { |
| assert inValues.size() == 1; |
| return inValues.get(0); |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| com.android.tools.r8.code.Instruction instruction; |
| int src = builder.allocatedRegister(value(), getNumber()); |
| DexField field = getField(); |
| switch (getType()) { |
| case INT: |
| case FLOAT: |
| instruction = new Sput(src, field); |
| break; |
| case LONG: |
| case DOUBLE: |
| instruction = new SputWide(src, field); |
| break; |
| case OBJECT: |
| instruction = new SputObject(src, field); |
| break; |
| case BOOLEAN: |
| instruction = new SputBoolean(src, field); |
| break; |
| case BYTE: |
| instruction = new SputByte(src, field); |
| break; |
| case CHAR: |
| instruction = new SputChar(src, field); |
| break; |
| case SHORT: |
| instruction = new SputShort(src, field); |
| break; |
| default: |
| throw new Unreachable("Unexpected type: " + getType()); |
| } |
| builder.add(this, instruction); |
| } |
| |
| @Override |
| public boolean instructionTypeCanThrow() { |
| // This can cause <clinit> to run. |
| return true; |
| } |
| |
| @Override |
| public boolean instructionMayHaveSideEffects(AppView<?> appView, DexType context) { |
| if (appView.appInfo().hasLiveness()) { |
| AppInfoWithLiveness appInfoWithLiveness = appView.appInfo().withLiveness(); |
| // MemberValuePropagation will replace the field read only if the target field has bound |
| // -assumevalues rule whose return value is *single*. |
| // |
| // Note that, in principle, class initializer of the field's holder may have side effects. |
| // However, with -assumevalues, we assume that the developer wants to remove field accesses. |
| ProguardMemberRule rule = appInfoWithLiveness.assumedValues.get(getField()); |
| if (rule != null && rule.getReturnValue().isSingleValue()) { |
| return false; |
| } |
| |
| if (instructionInstanceCanThrow(appView, context).isThrowing()) { |
| return true; |
| } |
| |
| DexEncodedField encodedField = appInfoWithLiveness.resolveField(getField()); |
| assert encodedField != null : "NoSuchFieldError (resolution failure) should be caught."; |
| |
| boolean isDeadProtoExtensionField = |
| appView.withGeneratedExtensionRegistryShrinker( |
| shrinker -> shrinker.isDeadProtoExtensionField(encodedField.field), false); |
| if (isDeadProtoExtensionField) { |
| return false; |
| } |
| |
| return appInfoWithLiveness.isFieldRead(encodedField) |
| || isStoringObjectWithFinalizer(appInfoWithLiveness); |
| } |
| |
| // In D8, we always have to assume that the field can be read, and thus have side effects. |
| return true; |
| } |
| |
| @Override |
| public boolean canBeDeadCode(AppView<?> appView, IRCode code) { |
| // static-put can be dead as long as it cannot have any of the following: |
| // * NoSuchFieldError (resolution failure) |
| // * IncompatibleClassChangeError (static-* instruction for instance fields) |
| // * IllegalAccessError (not visible from the access context) |
| // * side-effects in <clinit> |
| // * not read _globally_ |
| boolean haveSideEffects = instructionMayHaveSideEffects(appView, code.method.method.holder); |
| assert appView.enableWholeProgramOptimizations() || haveSideEffects |
| : "Expected static-put instruction to have side effects in D8"; |
| return !haveSideEffects; |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| return Constants.U8BIT_MAX; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| assert false : "StaticPut instructions define no values."; |
| return 0; |
| } |
| |
| @Override |
| public boolean identicalAfterRegisterAllocation(Instruction other, RegisterAllocator allocator) { |
| if (!super.identicalAfterRegisterAllocation(other, allocator)) { |
| return false; |
| } |
| |
| if (allocator.options().canHaveIncorrectJoinForArrayOfInterfacesBug()) { |
| StaticPut staticPut = other.asStaticPut(); |
| |
| // 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().getTypeLattice().isArrayType() && value() != staticPut.value()) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| if (!other.isStaticPut()) { |
| return false; |
| } |
| StaticPut o = other.asStaticPut(); |
| return o.getField() == getField() && o.getType() == getType(); |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, DexType invocationContext) { |
| return inliningConstraints.forStaticPut(getField(), invocationContext); |
| } |
| |
| @Override |
| public String toString() { |
| return super.toString() + "; field: " + getField().toSourceString(); |
| } |
| |
| @Override |
| public boolean isStaticPut() { |
| return true; |
| } |
| |
| @Override |
| public StaticPut asStaticPut() { |
| return this; |
| } |
| |
| @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.PUTSTATIC, getField(), builder.resolveField(getField()))); |
| } |
| |
| @Override |
| public boolean definitelyTriggersClassInitialization( |
| DexType clazz, |
| DexType context, |
| AppView<?> appView, |
| Query mode, |
| AnalysisAssumption assumption) { |
| return ClassInitializationAnalysis.InstructionUtils.forStaticPut( |
| this, clazz, appView, mode, assumption); |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, DexType context) { |
| DexType holder = getField().holder; |
| if (appView.enableWholeProgramOptimizations()) { |
| // In R8, check if the class initialization of the holder or any of its ancestor types may |
| // have side effects. |
| return holder.classInitializationMayHaveSideEffects( |
| appView, |
| // Types that are a super type of `context` are guaranteed to be initialized already. |
| type -> appView.isSubtype(context, type).isTrue()); |
| } else { |
| // In D8, this instruction may trigger class initialization if the holder of the field is |
| // different from the current context. |
| return holder != context; |
| } |
| } |
| } |