| // Copyright (c) 2017, 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.conversion; |
| |
| import static com.android.tools.r8.graph.UseRegistry.MethodHandleUse.NOT_ARGUMENT_TO_LAMBDA_METAFACTORY; |
| import static com.android.tools.r8.ir.code.Invoke.Type.STATIC; |
| import static com.android.tools.r8.ir.code.Invoke.Type.VIRTUAL; |
| import static com.android.tools.r8.ir.code.Opcodes.CHECK_CAST; |
| import static com.android.tools.r8.ir.code.Opcodes.CONST_CLASS; |
| import static com.android.tools.r8.ir.code.Opcodes.CONST_METHOD_HANDLE; |
| import static com.android.tools.r8.ir.code.Opcodes.INIT_CLASS; |
| import static com.android.tools.r8.ir.code.Opcodes.INSTANCE_GET; |
| import static com.android.tools.r8.ir.code.Opcodes.INSTANCE_OF; |
| import static com.android.tools.r8.ir.code.Opcodes.INSTANCE_PUT; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_CUSTOM; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_DIRECT; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_INTERFACE; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_MULTI_NEW_ARRAY; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_NEW_ARRAY; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_POLYMORPHIC; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_STATIC; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_SUPER; |
| import static com.android.tools.r8.ir.code.Opcodes.INVOKE_VIRTUAL; |
| import static com.android.tools.r8.ir.code.Opcodes.MOVE_EXCEPTION; |
| import static com.android.tools.r8.ir.code.Opcodes.NEW_ARRAY_EMPTY; |
| import static com.android.tools.r8.ir.code.Opcodes.NEW_INSTANCE; |
| import static com.android.tools.r8.ir.code.Opcodes.RETURN; |
| import static com.android.tools.r8.ir.code.Opcodes.STATIC_GET; |
| import static com.android.tools.r8.ir.code.Opcodes.STATIC_PUT; |
| import static com.android.tools.r8.utils.ObjectUtils.getBooleanOrElse; |
| |
| import com.android.tools.r8.errors.CompilationError; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppInfoWithClassHierarchy; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.DexCallSite; |
| import com.android.tools.r8.graph.DexClass; |
| import com.android.tools.r8.graph.DexField; |
| import com.android.tools.r8.graph.DexItemFactory; |
| import com.android.tools.r8.graph.DexMethod; |
| import com.android.tools.r8.graph.DexMethodHandle; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.GraphLens; |
| import com.android.tools.r8.graph.GraphLens.MethodLookupResult; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.graph.RewrittenPrototypeDescription; |
| import com.android.tools.r8.graph.RewrittenPrototypeDescription.ArgumentInfo; |
| import com.android.tools.r8.graph.RewrittenPrototypeDescription.ArgumentInfoCollection; |
| import com.android.tools.r8.graph.RewrittenPrototypeDescription.RewrittenTypeInfo; |
| import com.android.tools.r8.graph.classmerging.VerticallyMergedClasses; |
| import com.android.tools.r8.ir.analysis.type.DestructivePhiTypeUpdater; |
| import com.android.tools.r8.ir.analysis.type.TypeElement; |
| import com.android.tools.r8.ir.analysis.value.SingleNumberValue; |
| import com.android.tools.r8.ir.code.BasicBlock; |
| import com.android.tools.r8.ir.code.CatchHandlers; |
| import com.android.tools.r8.ir.code.CheckCast; |
| import com.android.tools.r8.ir.code.ConstClass; |
| import com.android.tools.r8.ir.code.ConstInstruction; |
| import com.android.tools.r8.ir.code.ConstMethodHandle; |
| import com.android.tools.r8.ir.code.IRCode; |
| import com.android.tools.r8.ir.code.InitClass; |
| import com.android.tools.r8.ir.code.InstanceGet; |
| import com.android.tools.r8.ir.code.InstanceOf; |
| import com.android.tools.r8.ir.code.InstancePut; |
| import com.android.tools.r8.ir.code.Instruction; |
| import com.android.tools.r8.ir.code.InstructionListIterator; |
| import com.android.tools.r8.ir.code.Invoke; |
| import com.android.tools.r8.ir.code.InvokeCustom; |
| import com.android.tools.r8.ir.code.InvokeDirect; |
| import com.android.tools.r8.ir.code.InvokeMethod; |
| import com.android.tools.r8.ir.code.InvokeMultiNewArray; |
| import com.android.tools.r8.ir.code.InvokeNewArray; |
| import com.android.tools.r8.ir.code.InvokeStatic; |
| import com.android.tools.r8.ir.code.MoveException; |
| import com.android.tools.r8.ir.code.NewArrayEmpty; |
| import com.android.tools.r8.ir.code.NewInstance; |
| import com.android.tools.r8.ir.code.Phi; |
| import com.android.tools.r8.ir.code.Position; |
| import com.android.tools.r8.ir.code.Return; |
| import com.android.tools.r8.ir.code.StaticGet; |
| import com.android.tools.r8.ir.code.StaticPut; |
| import com.android.tools.r8.ir.code.TypeAndLocalInfoSupplier; |
| import com.android.tools.r8.ir.code.Value; |
| import com.android.tools.r8.ir.code.ValueType; |
| import com.android.tools.r8.ir.optimize.enums.EnumUnboxer; |
| import com.android.tools.r8.logging.Log; |
| import com.google.common.collect.Sets; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.IdentityHashMap; |
| import java.util.List; |
| import java.util.ListIterator; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.function.BiFunction; |
| |
| public class LensCodeRewriter { |
| |
| private final AppView<? extends AppInfoWithClassHierarchy> appView; |
| |
| private final EnumUnboxer enumUnboxer; |
| private final LensCodeRewriterUtils helper; |
| |
| LensCodeRewriter(AppView<? extends AppInfoWithClassHierarchy> appView, EnumUnboxer enumUnboxer) { |
| this.appView = appView; |
| this.enumUnboxer = enumUnboxer; |
| this.helper = new LensCodeRewriterUtils(appView); |
| } |
| |
| private Value makeOutValue(Instruction insn, IRCode code) { |
| if (insn.outValue() != null) { |
| TypeElement oldType = insn.getOutType(); |
| TypeElement newType = |
| oldType.fixupClassTypeReferences(appView.graphLens()::lookupType, appView); |
| return code.createValue(newType, insn.getLocalInfo()); |
| } |
| return null; |
| } |
| |
| /** Replace type appearances, invoke targets and field accesses with actual definitions. */ |
| public void rewrite(IRCode code, ProgramMethod method) { |
| Set<Phi> affectedPhis = |
| enumUnboxer != null ? enumUnboxer.rewriteCode(code) : Sets.newIdentityHashSet(); |
| GraphLens graphLens = appView.graphLens(); |
| DexItemFactory factory = appView.dexItemFactory(); |
| // Rewriting types that affects phi can cause us to compute TOP for cyclic phi's. To solve this |
| // we track all phi's that needs to be re-computed. |
| ListIterator<BasicBlock> blocks = code.listIterator(); |
| boolean mayHaveUnreachableBlocks = false; |
| while (blocks.hasNext()) { |
| BasicBlock block = blocks.next(); |
| if (block.hasCatchHandlers() && appView.options().enableVerticalClassMerging) { |
| boolean anyGuardsRenamed = block.renameGuardsInCatchHandlers(graphLens); |
| if (anyGuardsRenamed) { |
| mayHaveUnreachableBlocks |= unlinkDeadCatchHandlers(block); |
| } |
| } |
| InstructionListIterator iterator = block.listIterator(code); |
| while (iterator.hasNext()) { |
| Instruction current = iterator.next(); |
| switch (current.opcode()) { |
| case INVOKE_CUSTOM: |
| { |
| InvokeCustom invokeCustom = current.asInvokeCustom(); |
| DexCallSite callSite = invokeCustom.getCallSite(); |
| DexCallSite newCallSite = helper.rewriteCallSite(callSite, method); |
| if (newCallSite != callSite) { |
| Value newOutValue = makeOutValue(invokeCustom, code); |
| InvokeCustom newInvokeCustom = |
| new InvokeCustom(newCallSite, newOutValue, invokeCustom.inValues()); |
| iterator.replaceCurrentInstruction(newInvokeCustom); |
| if (newOutValue != null && newOutValue.getType() != invokeCustom.getOutType()) { |
| affectedPhis.addAll(newOutValue.uniquePhiUsers()); |
| } |
| } |
| } |
| break; |
| |
| case CONST_METHOD_HANDLE: |
| { |
| DexMethodHandle handle = current.asConstMethodHandle().getValue(); |
| DexMethodHandle newHandle = |
| helper.rewriteDexMethodHandle(handle, NOT_ARGUMENT_TO_LAMBDA_METAFACTORY, method); |
| if (newHandle != handle) { |
| Value newOutValue = makeOutValue(current, code); |
| iterator.replaceCurrentInstruction(new ConstMethodHandle(newOutValue, newHandle)); |
| if (newOutValue != null && newOutValue.getType() != current.getOutType()) { |
| affectedPhis.addAll(newOutValue.uniquePhiUsers()); |
| } |
| } |
| } |
| break; |
| |
| case INIT_CLASS: |
| { |
| InitClass initClass = current.asInitClass(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| initClass.getClassValue(), (t, v) -> new InitClass(v, t)); |
| } |
| break; |
| |
| case INVOKE_DIRECT: |
| case INVOKE_INTERFACE: |
| case INVOKE_POLYMORPHIC: |
| case INVOKE_STATIC: |
| case INVOKE_SUPER: |
| case INVOKE_VIRTUAL: |
| { |
| InvokeMethod invoke = current.asInvokeMethod(); |
| DexMethod invokedMethod = invoke.getInvokedMethod(); |
| DexType invokedHolder = invokedMethod.holder; |
| if (invokedHolder.isArrayType()) { |
| DexType baseType = invokedHolder.toBaseType(factory); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| baseType, |
| (t, v) -> { |
| DexType mappedHolder = invokedHolder.replaceBaseType(t, factory); |
| // Just reuse proto and name, as no methods on array types cant be renamed |
| // nor change signature. |
| DexMethod actualTarget = |
| factory.createMethod( |
| mappedHolder, invokedMethod.proto, invokedMethod.name); |
| return Invoke.create(VIRTUAL, actualTarget, null, v, invoke.inValues()); |
| }); |
| continue; |
| } |
| if (!invokedHolder.isClassType()) { |
| assert false; |
| continue; |
| } |
| if (invoke.isInvokeDirect()) { |
| checkInvokeDirect(method.getReference(), invoke.asInvokeDirect()); |
| } |
| MethodLookupResult lensLookup = |
| graphLens.lookupMethod(invokedMethod, method.getReference(), invoke.getType()); |
| DexMethod actualTarget = lensLookup.getReference(); |
| Invoke.Type actualInvokeType = lensLookup.getType(); |
| if (actualTarget != invokedMethod || invoke.getType() != actualInvokeType) { |
| RewrittenPrototypeDescription prototypeChanges = lensLookup.getPrototypeChanges(); |
| |
| List<Value> newInValues; |
| ArgumentInfoCollection argumentInfoCollection = |
| prototypeChanges.getArgumentInfoCollection(); |
| if (argumentInfoCollection.isEmpty()) { |
| newInValues = invoke.inValues(); |
| } else { |
| if (argumentInfoCollection.hasRemovedArguments()) { |
| if (Log.ENABLED) { |
| Log.info( |
| getClass(), |
| "Invoked method " |
| + invokedMethod.toSourceString() |
| + " with " |
| + argumentInfoCollection.numberOfRemovedArguments() |
| + " arguments removed"); |
| } |
| } |
| newInValues = new ArrayList<>(actualTarget.proto.parameters.size()); |
| for (int i = 0; i < invoke.inValues().size(); i++) { |
| ArgumentInfo argumentInfo = argumentInfoCollection.getArgumentInfo(i); |
| if (argumentInfo.isRewrittenTypeInfo()) { |
| RewrittenTypeInfo argInfo = argumentInfo.asRewrittenTypeInfo(); |
| Value rewrittenValue = |
| rewriteValueIfDefault( |
| code, |
| iterator, |
| argInfo.getOldType(), |
| argInfo.getNewType(), |
| invoke.inValues().get(i)); |
| newInValues.add(rewrittenValue); |
| } else if (!argumentInfo.isRemovedArgumentInfo()) { |
| newInValues.add(invoke.inValues().get(i)); |
| } |
| } |
| } |
| |
| ConstInstruction constantReturnMaterializingInstruction = null; |
| if (prototypeChanges.hasBeenChangedToReturnVoid(appView) |
| && invoke.outValue() != null) { |
| constantReturnMaterializingInstruction = |
| prototypeChanges.getConstantReturn(code, invoke.getPosition()); |
| if (invoke.outValue().hasLocalInfo()) { |
| constantReturnMaterializingInstruction |
| .outValue() |
| .setLocalInfo(invoke.outValue().getLocalInfo()); |
| } |
| invoke.outValue().replaceUsers(constantReturnMaterializingInstruction.outValue()); |
| if (graphLens.lookupType(invoke.getReturnType()) != invoke.getReturnType()) { |
| affectedPhis.addAll( |
| constantReturnMaterializingInstruction.outValue().uniquePhiUsers()); |
| } |
| } |
| |
| Value newOutValue = |
| prototypeChanges.hasBeenChangedToReturnVoid(appView) |
| ? null |
| : makeOutValue(invoke, code); |
| |
| Map<SingleNumberValue, Map<DexType, Value>> parameterMap = new IdentityHashMap<>(); |
| |
| int parameterIndex = newInValues.size() - (actualInvokeType == STATIC ? 0 : 1); |
| for (ExtraParameter parameter : prototypeChanges.getExtraParameters()) { |
| DexType type = actualTarget.proto.getParameter(parameterIndex++); |
| |
| SingleNumberValue numberValue = parameter.getValue(appView); |
| |
| // Try to find an existing constant instruction, otherwise generate a new one. |
| Value value = |
| parameterMap |
| .computeIfAbsent(numberValue, ignore -> new IdentityHashMap<>()) |
| .computeIfAbsent( |
| type, |
| ignore -> { |
| iterator.previous(); |
| Instruction instruction = |
| numberValue.createMaterializingInstruction( |
| appView, |
| code, |
| TypeAndLocalInfoSupplier.create( |
| parameter.getTypeElement(appView, type), null)); |
| assert !instruction.instructionTypeCanThrow(); |
| instruction.setPosition( |
| appView.options().debug |
| ? invoke.getPosition() |
| : Position.none()); |
| iterator.add(instruction); |
| iterator.next(); |
| return instruction.outValue(); |
| }); |
| |
| newInValues.add(value); |
| |
| // TODO(b/164901008): Fix when the number of arguments overflows. |
| if (newInValues.size() > 255) { |
| throw new CompilationError( |
| "The addition of extra unused null parameters in R8 led to the overflow of" |
| + " the number of arguments of the method " |
| + actualTarget); |
| } |
| } |
| |
| assert newInValues.size() |
| == actualTarget.proto.parameters.size() + (actualInvokeType == STATIC ? 0 : 1); |
| |
| // TODO(b/157111832): This bit should be part of the graph lens lookup result. |
| boolean isInterface = |
| getBooleanOrElse( |
| appView.definitionFor(actualTarget.holder), DexClass::isInterface, false); |
| Invoke newInvoke = |
| Invoke.create( |
| actualInvokeType, |
| actualTarget, |
| null, |
| newOutValue, |
| newInValues, |
| isInterface); |
| iterator.replaceCurrentInstruction(newInvoke); |
| if (newOutValue != null && newOutValue.getType() != current.getOutType()) { |
| affectedPhis.addAll(newOutValue.uniquePhiUsers()); |
| } |
| |
| if (constantReturnMaterializingInstruction != null) { |
| if (block.hasCatchHandlers()) { |
| // Split the block to ensure no instructions after throwing instructions. |
| iterator |
| .split(code, blocks) |
| .listIterator(code) |
| .add(constantReturnMaterializingInstruction); |
| } else { |
| iterator.add(constantReturnMaterializingInstruction); |
| } |
| } |
| |
| DexType actualReturnType = actualTarget.proto.returnType; |
| DexType expectedReturnType = graphLens.lookupType(invokedMethod.proto.returnType); |
| if (newInvoke.outValue() != null && actualReturnType != expectedReturnType) { |
| throw new Unreachable( |
| "Unexpected need to insert a cast. Possibly related to resolving" |
| + " b/79143143.\n" |
| + invokedMethod |
| + " type changed from " |
| + expectedReturnType |
| + " to " |
| + actualReturnType); |
| } |
| } |
| } |
| break; |
| |
| case INSTANCE_GET: |
| { |
| InstanceGet instanceGet = current.asInstanceGet(); |
| DexField field = instanceGet.getField(); |
| DexField actualField = graphLens.lookupField(field); |
| DexMethod replacementMethod = |
| graphLens.lookupGetFieldForMethod(actualField, method.getReference()); |
| if (replacementMethod != null) { |
| Value newOutValue = makeOutValue(current, code); |
| iterator.replaceCurrentInstruction( |
| new InvokeStatic(replacementMethod, newOutValue, current.inValues())); |
| if (newOutValue != null && newOutValue.getType() != current.getOutType()) { |
| affectedPhis.addAll(current.outValue().uniquePhiUsers()); |
| } |
| } else if (actualField != field) { |
| Value newOutValue = makeOutValue(instanceGet, code); |
| iterator.replaceCurrentInstruction( |
| new InstanceGet(newOutValue, instanceGet.object(), actualField)); |
| if (newOutValue != null && newOutValue.getType() != current.getOutType()) { |
| affectedPhis.addAll(newOutValue.uniquePhiUsers()); |
| } |
| } |
| } |
| break; |
| |
| case INSTANCE_PUT: |
| { |
| InstancePut instancePut = current.asInstancePut(); |
| DexField field = instancePut.getField(); |
| DexField actualField = graphLens.lookupField(field); |
| DexMethod replacementMethod = |
| graphLens.lookupPutFieldForMethod(actualField, method.getReference()); |
| if (replacementMethod != null) { |
| iterator.replaceCurrentInstruction( |
| new InvokeStatic(replacementMethod, null, current.inValues())); |
| } else if (actualField != field) { |
| Value rewrittenValue = |
| rewriteValueIfDefault( |
| code, iterator, field.type, actualField.type, instancePut.value()); |
| InstancePut newInstancePut = |
| InstancePut.createPotentiallyInvalid( |
| actualField, instancePut.object(), rewrittenValue); |
| iterator.replaceCurrentInstruction(newInstancePut); |
| } |
| } |
| break; |
| |
| case STATIC_GET: |
| { |
| StaticGet staticGet = current.asStaticGet(); |
| DexField field = staticGet.getField(); |
| DexField actualField = graphLens.lookupField(field); |
| DexMethod replacementMethod = |
| graphLens.lookupGetFieldForMethod(actualField, method.getReference()); |
| if (replacementMethod != null) { |
| Value newOutValue = makeOutValue(current, code); |
| iterator.replaceCurrentInstruction( |
| new InvokeStatic(replacementMethod, newOutValue, current.inValues())); |
| if (newOutValue != null && newOutValue.getType() != current.getOutType()) { |
| affectedPhis.addAll(newOutValue.uniquePhiUsers()); |
| } |
| } else if (actualField != field) { |
| Value newOutValue = makeOutValue(staticGet, code); |
| iterator.replaceCurrentInstruction(new StaticGet(newOutValue, actualField)); |
| if (newOutValue != null && newOutValue.getType() != current.getOutType()) { |
| affectedPhis.addAll(newOutValue.uniquePhiUsers()); |
| } |
| } |
| } |
| break; |
| |
| case STATIC_PUT: |
| { |
| StaticPut staticPut = current.asStaticPut(); |
| DexField field = staticPut.getField(); |
| DexField actualField = graphLens.lookupField(field); |
| DexMethod replacementMethod = |
| graphLens.lookupPutFieldForMethod(actualField, method.getReference()); |
| if (replacementMethod != null) { |
| iterator.replaceCurrentInstruction( |
| new InvokeStatic(replacementMethod, current.outValue(), current.inValues())); |
| } else if (actualField != field) { |
| Value rewrittenValue = |
| rewriteValueIfDefault( |
| code, iterator, field.type, actualField.type, staticPut.value()); |
| StaticPut newStaticPut = new StaticPut(rewrittenValue, actualField); |
| iterator.replaceCurrentInstruction(newStaticPut); |
| } |
| } |
| break; |
| |
| case CHECK_CAST: |
| { |
| CheckCast checkCast = current.asCheckCast(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| checkCast.getType(), (t, v) -> new CheckCast(v, checkCast.object(), t)); |
| } |
| break; |
| |
| case CONST_CLASS: |
| { |
| ConstClass constClass = current.asConstClass(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| constClass.getValue(), (t, v) -> new ConstClass(v, t)); |
| } |
| break; |
| |
| case INSTANCE_OF: |
| { |
| InstanceOf instanceOf = current.asInstanceOf(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| instanceOf.type(), (t, v) -> new InstanceOf(v, instanceOf.value(), t)); |
| } |
| break; |
| |
| case INVOKE_MULTI_NEW_ARRAY: |
| { |
| InvokeMultiNewArray multiNewArray = current.asInvokeMultiNewArray(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| multiNewArray.getArrayType(), |
| (t, v) -> new InvokeMultiNewArray(t, v, multiNewArray.inValues())); |
| } |
| break; |
| |
| case INVOKE_NEW_ARRAY: |
| { |
| InvokeNewArray newArray = current.asInvokeNewArray(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| newArray.getArrayType(), |
| (t, v) -> new InvokeNewArray(t, v, newArray.inValues())); |
| } |
| break; |
| |
| case MOVE_EXCEPTION: |
| { |
| MoveException moveException = current.asMoveException(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| moveException.getExceptionType(), |
| (t, v) -> new MoveException(v, t, appView.options())); |
| } |
| break; |
| |
| case NEW_ARRAY_EMPTY: |
| { |
| NewArrayEmpty newArrayEmpty = current.asNewArrayEmpty(); |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged( |
| newArrayEmpty.type, (t, v) -> new NewArrayEmpty(v, newArrayEmpty.size(), t)); |
| } |
| break; |
| |
| case NEW_INSTANCE: |
| { |
| DexType type = current.asNewInstance().clazz; |
| new InstructionReplacer(code, current, iterator, affectedPhis) |
| .replaceInstructionIfTypeChanged(type, NewInstance::new); |
| } |
| break; |
| |
| case RETURN: |
| { |
| Return ret = current.asReturn(); |
| if (ret.isReturnVoid()) { |
| break; |
| } |
| DexType returnType = code.method().method.proto.returnType; |
| Value retValue = ret.returnValue(); |
| DexType initialType = |
| retValue.getType().isPrimitiveType() |
| ? retValue.getType().asPrimitiveType().toDexType(factory) |
| : factory.objectType; // Place holder, any reference type will do. |
| Value rewrittenValue = |
| rewriteValueIfDefault(code, iterator, initialType, returnType, retValue); |
| if (retValue != rewrittenValue) { |
| Return newReturn = new Return(rewrittenValue); |
| iterator.replaceCurrentInstruction(newReturn); |
| } |
| } |
| break; |
| |
| default: |
| if (current.hasOutValue()) { |
| // For all other instructions, substitute any changed type. |
| TypeElement type = current.getOutType(); |
| TypeElement substituted = |
| type.fixupClassTypeReferences(graphLens::lookupType, appView); |
| if (substituted != type) { |
| current.outValue().setType(substituted); |
| affectedPhis.addAll(current.outValue().uniquePhiUsers()); |
| } |
| } |
| break; |
| } |
| } |
| } |
| if (mayHaveUnreachableBlocks) { |
| code.removeUnreachableBlocks(); |
| } |
| if (!affectedPhis.isEmpty()) { |
| new DestructivePhiTypeUpdater(appView).recomputeAndPropagateTypes(code, affectedPhis); |
| } |
| assert code.isConsistentSSABeforeTypesAreCorrect(); |
| assert code.hasNoVerticallyMergedClasses(appView); |
| } |
| |
| // If the initialValue is a default value and its type is rewritten from a reference type to a |
| // primitive type, then the default value type lattice needs to be changed. |
| private Value rewriteValueIfDefault( |
| IRCode code, |
| InstructionListIterator iterator, |
| DexType oldType, |
| DexType newType, |
| Value initialValue) { |
| if (initialValue.isConstNumber() |
| && initialValue.definition.asConstNumber().isZero() |
| && defaultValueHasChanged(oldType, newType)) { |
| iterator.previous(); |
| Value rewrittenDefaultValue = |
| iterator.insertConstNumberInstruction( |
| code, appView.options(), 0, defaultValueLatticeElement(newType)); |
| iterator.next(); |
| return rewrittenDefaultValue; |
| } |
| return initialValue; |
| } |
| |
| private boolean defaultValueHasChanged(DexType oldType, DexType newType) { |
| if (newType.isPrimitiveType()) { |
| if (oldType.isPrimitiveType()) { |
| return ValueType.fromDexType(newType) != ValueType.fromDexType(oldType); |
| } |
| return true; |
| } else if (oldType.isPrimitiveType()) { |
| return true; |
| } |
| // All reference types uses null as default value. |
| assert newType.isReferenceType(); |
| assert oldType.isReferenceType(); |
| return false; |
| } |
| |
| private TypeElement defaultValueLatticeElement(DexType type) { |
| if (type.isPrimitiveType()) { |
| return TypeElement.fromDexType(type, null, appView); |
| } |
| return TypeElement.getNull(); |
| } |
| |
| // If the given invoke is on the form "invoke-direct A.<init>, v0, ..." and the definition of |
| // value v0 is "new-instance v0, B", where B is a subtype of A (see the Art800 and B116282409 |
| // tests), then fail with a compilation error if A has previously been merged into B. |
| // |
| // The motivation for this is that the vertical class merger cannot easily recognize the above |
| // code pattern, since it runs prior to IR construction. Therefore, we currently allow merging |
| // A and B although this will lead to invalid code, because this code pattern does generally |
| // not occur in practice (it leads to a verification error on the JVM, but not on Art). |
| private void checkInvokeDirect(DexMethod method, InvokeDirect invoke) { |
| VerticallyMergedClasses verticallyMergedClasses = appView.verticallyMergedClasses(); |
| if (verticallyMergedClasses == null) { |
| // No need to check the invocation. |
| return; |
| } |
| DexMethod invokedMethod = invoke.getInvokedMethod(); |
| if (invokedMethod.name != appView.dexItemFactory().constructorMethodName) { |
| // Not a constructor call. |
| return; |
| } |
| if (invoke.arguments().isEmpty()) { |
| // The new instance should always be passed to the constructor call, but continue gracefully. |
| return; |
| } |
| Value receiver = invoke.arguments().get(0); |
| if (!receiver.isPhi() && receiver.definition.isNewInstance()) { |
| NewInstance newInstance = receiver.definition.asNewInstance(); |
| if (newInstance.clazz != invokedMethod.holder |
| && verticallyMergedClasses.hasBeenMergedIntoSubtype(invokedMethod.holder)) { |
| // Generated code will not work. Fail with a compilation error. |
| throw appView |
| .options() |
| .reporter |
| .fatalError( |
| String.format( |
| "Unable to rewrite `invoke-direct %s.<init>(new %s, ...)` in method `%s` after " |
| + "type `%s` was merged into `%s`. Please add the following rule to your " |
| + "Proguard configuration file: `-keep,allowobfuscation class %s`.", |
| invokedMethod.holder.toSourceString(), |
| newInstance.clazz, |
| method.toSourceString(), |
| invokedMethod.holder, |
| verticallyMergedClasses.getTargetFor(invokedMethod.holder), |
| invokedMethod.holder.toSourceString())); |
| } |
| } |
| } |
| |
| /** |
| * Due to class merging, it is possible that two exception classes have been merged into one. This |
| * function removes catch handlers where the guards ended up being the same as a previous one. |
| * |
| * @return true if any dead catch handlers were removed. |
| */ |
| private boolean unlinkDeadCatchHandlers(BasicBlock block) { |
| assert block.hasCatchHandlers(); |
| CatchHandlers<BasicBlock> catchHandlers = block.getCatchHandlers(); |
| List<DexType> guards = catchHandlers.getGuards(); |
| List<BasicBlock> targets = catchHandlers.getAllTargets(); |
| |
| Set<DexType> previouslySeenGuards = new HashSet<>(); |
| List<BasicBlock> deadCatchHandlers = new ArrayList<>(); |
| for (int i = 0; i < guards.size(); i++) { |
| // The type may have changed due to class merging. |
| DexType guard = appView.graphLens().lookupType(guards.get(i)); |
| boolean guardSeenBefore = !previouslySeenGuards.add(guard); |
| if (guardSeenBefore) { |
| deadCatchHandlers.add(targets.get(i)); |
| } |
| } |
| // Remove the guards that are guaranteed to be dead. |
| for (BasicBlock deadCatchHandler : deadCatchHandlers) { |
| deadCatchHandler.unlinkCatchHandler(); |
| } |
| assert block.consistentCatchHandlers(); |
| return !deadCatchHandlers.isEmpty(); |
| } |
| |
| class InstructionReplacer { |
| |
| private final IRCode code; |
| private final Instruction current; |
| private final InstructionListIterator iterator; |
| private final Set<Phi> affectedPhis; |
| |
| InstructionReplacer( |
| IRCode code, Instruction current, InstructionListIterator iterator, Set<Phi> affectedPhis) { |
| this.code = code; |
| this.current = current; |
| this.iterator = iterator; |
| this.affectedPhis = affectedPhis; |
| } |
| |
| void replaceInstructionIfTypeChanged( |
| DexType type, BiFunction<DexType, Value, Instruction> constructor) { |
| DexType newType = appView.graphLens().lookupType(type); |
| if (newType != type) { |
| Value newOutValue = makeOutValue(current, code); |
| Instruction newInstruction = constructor.apply(newType, newOutValue); |
| iterator.replaceCurrentInstruction(newInstruction); |
| if (newOutValue != null) { |
| if (newOutValue.getType() != current.getOutType()) { |
| affectedPhis.addAll(newOutValue.uniquePhiUsers()); |
| } else { |
| assert current.hasInvariantOutType(); |
| assert current.isConstClass() |
| || current.isInitClass() |
| || current.isInstanceOf() |
| || (current.isInvokeVirtual() |
| && current.asInvokeVirtual().getInvokedMethod().holder.isArrayType()); |
| } |
| } |
| } |
| } |
| } |
| } |
