| // 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.cf.code; |
| |
| import com.android.tools.r8.cf.CfPrinter; |
| import com.android.tools.r8.dex.Constants; |
| import com.android.tools.r8.errors.CompilationError; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.DexClass; |
| import com.android.tools.r8.graph.DexClassAndMethod; |
| import com.android.tools.r8.graph.DexEncodedMethod; |
| import com.android.tools.r8.graph.DexMethod; |
| import com.android.tools.r8.graph.DexProgramClass; |
| import com.android.tools.r8.graph.DexProto; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.GraphLense; |
| import com.android.tools.r8.graph.GraphLense.GraphLenseLookupResult; |
| import com.android.tools.r8.graph.InitClassLens; |
| import com.android.tools.r8.graph.UseRegistry; |
| import com.android.tools.r8.ir.code.Invoke; |
| import com.android.tools.r8.ir.code.Invoke.Type; |
| import com.android.tools.r8.ir.code.ValueType; |
| import com.android.tools.r8.ir.conversion.CfSourceCode; |
| import com.android.tools.r8.ir.conversion.CfState; |
| import com.android.tools.r8.ir.conversion.CfState.Slot; |
| import com.android.tools.r8.ir.conversion.IRBuilder; |
| import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget; |
| import com.android.tools.r8.ir.optimize.InliningConstraints; |
| import com.android.tools.r8.naming.NamingLens; |
| import java.util.Arrays; |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.Opcodes; |
| |
| public class CfInvoke extends CfInstruction { |
| |
| private final DexMethod method; |
| private final int opcode; |
| private final boolean itf; |
| |
| public CfInvoke(int opcode, DexMethod method, boolean itf) { |
| assert Opcodes.INVOKEVIRTUAL <= opcode && opcode <= Opcodes.INVOKEINTERFACE; |
| assert !(opcode == Opcodes.INVOKEVIRTUAL && itf) : "InvokeVirtual on interface type"; |
| assert !(opcode == Opcodes.INVOKEINTERFACE && !itf) : "InvokeInterface on class type"; |
| this.opcode = opcode; |
| this.method = method; |
| this.itf = itf; |
| } |
| |
| public DexMethod getMethod() { |
| return method; |
| } |
| |
| public int getOpcode() { |
| return opcode; |
| } |
| |
| public boolean isInterface() { |
| return itf; |
| } |
| |
| @Override |
| public CfInvoke asInvoke() { |
| return this; |
| } |
| |
| @Override |
| public boolean isInvoke() { |
| return true; |
| } |
| |
| @Override |
| public void write(MethodVisitor visitor, InitClassLens initClassLens, NamingLens lens) { |
| String owner = lens.lookupInternalName(method.holder); |
| String name = lens.lookupName(method).toString(); |
| String desc = method.proto.toDescriptorString(lens); |
| visitor.visitMethodInsn(opcode, owner, name, desc, itf); |
| } |
| |
| @Override |
| public void print(CfPrinter printer) { |
| printer.print(this); |
| } |
| |
| @Override |
| void internalRegisterUse(UseRegistry registry, DexClassAndMethod context) { |
| switch (opcode) { |
| case Opcodes.INVOKEINTERFACE: |
| registry.registerInvokeInterface(method); |
| break; |
| case Opcodes.INVOKEVIRTUAL: |
| registry.registerInvokeVirtual(method); |
| break; |
| case Opcodes.INVOKESPECIAL: |
| if (method.name.toString().equals(Constants.INSTANCE_INITIALIZER_NAME)) { |
| registry.registerInvokeDirect(method); |
| } else if (method.holder == context.getHolderType()) { |
| registry.registerInvokeDirect(method); |
| } else { |
| registry.registerInvokeSuper(method); |
| } |
| break; |
| case Opcodes.INVOKESTATIC: |
| registry.registerInvokeStatic(method); |
| break; |
| default: |
| throw new Unreachable("unknown CfInvoke opcode " + opcode); |
| } |
| } |
| |
| public boolean isInvokeSuper(DexType clazz) { |
| return opcode == Opcodes.INVOKESPECIAL && |
| method.holder != clazz && |
| !method.name.toString().equals(Constants.INSTANCE_INITIALIZER_NAME); |
| } |
| |
| public boolean isInvokeVirtual() { |
| return opcode == Opcodes.INVOKEVIRTUAL; |
| } |
| |
| @Override |
| public boolean canThrow() { |
| return true; |
| } |
| |
| @Override |
| public void buildIR(IRBuilder builder, CfState state, CfSourceCode code) { |
| Invoke.Type type; |
| DexMethod canonicalMethod; |
| DexProto callSiteProto = null; |
| switch (opcode) { |
| case Opcodes.INVOKEINTERFACE: |
| { |
| canonicalMethod = method; |
| type = Type.INTERFACE; |
| break; |
| } |
| case Opcodes.INVOKEVIRTUAL: |
| { |
| canonicalMethod = |
| builder.appView.dexItemFactory().polymorphicMethods.canonicalize(method); |
| if (canonicalMethod == null) { |
| type = Type.VIRTUAL; |
| canonicalMethod = method; |
| } else { |
| type = Type.POLYMORPHIC; |
| callSiteProto = method.proto; |
| } |
| break; |
| } |
| case Opcodes.INVOKESPECIAL: |
| { |
| // Per https://source.android.com/devices/tech/dalvik/dalvik-bytecode, for Dex files |
| // version >= 037, if the method refers to an interface method, invoke-super is used to |
| // invoke the most specific, non-overridden version of that method. |
| // In https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.12.3, it is |
| // a compile-time error in the case that "If TypeName denotes an interface, let T be the |
| // type declaration immediately enclosing the method invocation. A compile-time error |
| // occurs if there exists a method, distinct from the compile-time declaration, that |
| // overrides (ยง9.4.1) the compile-time declaration from a direct superclass or |
| // direct superinterface of T." |
| // Using invoke-super should therefore observe the correct semantics since we cannot |
| // target less specific targets (up in the hierarchy). |
| canonicalMethod = method; |
| if (method.name.toString().equals(Constants.INSTANCE_INITIALIZER_NAME)) { |
| type = Type.DIRECT; |
| } else if (code.getOriginalHolder() == method.holder) { |
| type = invokeTypeForInvokeSpecialToNonInitMethodOnHolder(builder.appView, code); |
| } else { |
| type = Type.SUPER; |
| } |
| break; |
| } |
| case Opcodes.INVOKESTATIC: |
| { |
| canonicalMethod = method; |
| type = Type.STATIC; |
| break; |
| } |
| default: |
| throw new Unreachable("unknown CfInvoke opcode " + opcode); |
| } |
| int parameterCount = method.proto.parameters.size(); |
| if (type != Type.STATIC) { |
| parameterCount += 1; |
| } |
| ValueType[] types = new ValueType[parameterCount]; |
| Integer[] registers = new Integer[parameterCount]; |
| for (int i = parameterCount - 1; i >= 0; i--) { |
| Slot slot = state.pop(); |
| types[i] = slot.type; |
| registers[i] = slot.register; |
| } |
| builder.addInvoke( |
| type, canonicalMethod, callSiteProto, Arrays.asList(types), Arrays.asList(registers), itf); |
| if (!method.proto.returnType.isVoidType()) { |
| builder.addMoveResult(state.push(method.proto.returnType).register); |
| } |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, DexProgramClass context) { |
| GraphLense graphLense = inliningConstraints.getGraphLense(); |
| AppView<?> appView = inliningConstraints.getAppView(); |
| DexMethod target = method; |
| // Find the DEX invocation type. |
| Type type; |
| switch (opcode) { |
| case Opcodes.INVOKEINTERFACE: |
| // Could have changed to an invoke-virtual instruction due to vertical class merging |
| // (if an interface is merged into a class). |
| type = graphLense.lookupMethod(target, null, Type.INTERFACE).getType(); |
| assert type == Type.INTERFACE || type == Type.VIRTUAL; |
| break; |
| |
| case Opcodes.INVOKESPECIAL: |
| if (appView.dexItemFactory().isConstructor(target)) { |
| type = Type.DIRECT; |
| assert noNeedToUseGraphLense(target, type, graphLense); |
| } else if (target.holder == context.type) { |
| // The method could have been publicized. |
| type = graphLense.lookupMethod(target, null, Type.DIRECT).getType(); |
| assert type == Type.DIRECT || type == Type.VIRTUAL; |
| } else { |
| // This is a super call. Note that the vertical class merger translates some invoke-super |
| // instructions to invoke-direct. However, when that happens, the invoke instruction and |
| // the target method end up being in the same class, and therefore, we will allow inlining |
| // it. The result of using type=SUPER below will be the same, since it leads to the |
| // inlining constraint SAMECLASS. |
| // TODO(christofferqa): Consider using graphLense.lookupMethod (to do this, we need the |
| // context for the graph lense, though). |
| type = Type.SUPER; |
| assert noNeedToUseGraphLense(target, type, graphLense); |
| } |
| break; |
| |
| case Opcodes.INVOKESTATIC: |
| { |
| // Static invokes may have changed as a result of horizontal class merging. |
| GraphLenseLookupResult lookup = graphLense.lookupMethod(target, null, Type.STATIC); |
| target = lookup.getMethod(); |
| type = lookup.getType(); |
| } |
| break; |
| |
| case Opcodes.INVOKEVIRTUAL: |
| { |
| type = Type.VIRTUAL; |
| // Instructions that target a private method in the same class translates to |
| // invoke-direct. |
| if (target.holder == context.type) { |
| DexClass clazz = appView.definitionFor(target.holder); |
| if (clazz != null && clazz.lookupDirectMethod(target) != null) { |
| type = Type.DIRECT; |
| } |
| } |
| |
| // Virtual invokes may have changed to interface invokes as a result of member rebinding. |
| GraphLenseLookupResult lookup = graphLense.lookupMethod(target, null, type); |
| target = lookup.getMethod(); |
| type = lookup.getType(); |
| } |
| break; |
| |
| default: |
| throw new Unreachable("Unexpected opcode " + opcode); |
| } |
| |
| return inliningConstraints.forInvoke(target, type, context); |
| } |
| |
| private static boolean noNeedToUseGraphLense( |
| DexMethod method, Invoke.Type type, GraphLense graphLense) { |
| assert graphLense.lookupMethod(method, null, type).getType() == type; |
| return true; |
| } |
| |
| private Type invokeTypeForInvokeSpecialToNonInitMethodOnHolder( |
| AppView<?> appView, CfSourceCode code) { |
| boolean desugaringEnabled = appView.options().isInterfaceMethodDesugaringEnabled(); |
| DexEncodedMethod encodedMethod = lookupMethod(appView, method); |
| if (encodedMethod == null) { |
| // The method is not defined on the class, we can use super to target. When desugaring |
| // default interface methods, it is expected they are targeted with invoke-direct. |
| return this.itf && desugaringEnabled ? Type.DIRECT : Type.SUPER; |
| } |
| if (!encodedMethod.isNonPrivateVirtualMethod()) { |
| return Type.DIRECT; |
| } |
| if (encodedMethod.accessFlags.isFinal()) { |
| // This method is final which indicates no subtype will overwrite it, we can use |
| // invoke-virtual. |
| return Type.VIRTUAL; |
| } |
| if (this.itf && encodedMethod.isDefaultMethod()) { |
| return desugaringEnabled ? Type.DIRECT : Type.SUPER; |
| } |
| // We cannot emulate the semantics of invoke-special in this case and should throw a compilation |
| // error. |
| throw new CompilationError( |
| "Failed to compile unsupported use of invokespecial", code.getOrigin()); |
| } |
| |
| private DexEncodedMethod lookupMethod(AppView<?> appView, DexMethod method) { |
| GraphLenseLookupResult lookupResult = |
| appView.graphLense().lookupMethod(method, method, Type.DIRECT); |
| DexMethod rewrittenMethod = lookupResult.getMethod(); |
| DexProgramClass clazz = appView.definitionForProgramType(rewrittenMethod.holder); |
| assert clazz != null; |
| return clazz.lookupMethod(rewrittenMethod); |
| } |
| } |
