| // Copyright (c) 2019, 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.graph.analysis; |
| |
| import com.android.tools.r8.cf.code.CfArrayStore; |
| import com.android.tools.r8.cf.code.CfConstNumber; |
| import com.android.tools.r8.cf.code.CfFieldInstruction; |
| import com.android.tools.r8.cf.code.CfGoto; |
| import com.android.tools.r8.cf.code.CfIf; |
| import com.android.tools.r8.cf.code.CfInstruction; |
| import com.android.tools.r8.cf.code.CfInvoke; |
| import com.android.tools.r8.cf.code.CfLoad; |
| import com.android.tools.r8.cf.code.CfLogicalBinop; |
| import com.android.tools.r8.graph.CfCode; |
| import com.android.tools.r8.graph.Code; |
| import com.android.tools.r8.graph.DexEncodedMethod; |
| import com.android.tools.r8.graph.DexItemFactory; |
| import com.android.tools.r8.graph.DexString; |
| import com.android.tools.r8.graph.ProgramDefinition; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.optimize.info.OptimizationFeedback; |
| import com.google.common.collect.ImmutableList; |
| import java.util.List; |
| import org.objectweb.asm.Opcodes; |
| |
| public class ClassInitializerAssertionEnablingAnalysis extends EnqueuerAnalysis { |
| private final DexItemFactory dexItemFactory; |
| private final OptimizationFeedback feedback; |
| private final DexString kotlinAssertionsEnabled; |
| |
| public ClassInitializerAssertionEnablingAnalysis( |
| DexItemFactory dexItemFactory, OptimizationFeedback feedback) { |
| this.dexItemFactory = dexItemFactory; |
| this.feedback = feedback; |
| this.kotlinAssertionsEnabled = dexItemFactory.createString("ENABLED"); |
| } |
| |
| @Override |
| public void processNewlyLiveMethod(ProgramMethod method, ProgramDefinition context) { |
| DexEncodedMethod definition = method.getDefinition(); |
| if (definition.isClassInitializer()) { |
| Code code = definition.getCode(); |
| if (code.isCfCode()) { |
| if (hasJavacClinitAssertionCode(code.asCfCode()) || hasKotlincClinitAssertionCode(method)) { |
| feedback.setInitializerEnablingJavaVmAssertions(definition); |
| } |
| } |
| } |
| } |
| |
| // The <clinit> instruction sequence generated by javac for classes which use assertions. The |
| // call to desiredAssertionStatus() will provide the value for the -ea option for the class. |
| // |
| // 0: ldc #<n> // Current class |
| // 2: invokevirtual #<n> // Method java/lang/Class.desiredAssertionStatus:()Z |
| // 5: ifne 12 |
| // 8: iconst_1 |
| // 9: goto 13 |
| // 12: iconst_0 |
| // 13: putstatic #<n> // Field $assertionsDisabled:Z |
| |
| // R8 processing with class file backend will rewrite this sequence to either of the following |
| // depending on debug or release mode. |
| |
| // 2: ldc #<n> // Current class |
| // 3: invokevirtual #<n> // Method java/lang/Class.desiredAssertionStatus:()Z |
| // 4: istore 0 |
| // 5: iload 0 |
| // 6: ldc 1 |
| // 7: ixor |
| // 8: istore 0 |
| // 9: iload 0 |
| // 13: putstatic #<n> // Field $assertionsDisabled:Z |
| |
| // 2: ldc #<n> // Current class |
| // 3: invokevirtual // Method java/lang/Class.desiredAssertionStatus:()Z |
| // 4: ldc 1 |
| // 5: ixor |
| // 13: putstatic #<n> // Field $assertionsDisabled:Z |
| |
| // The <clinit> instruction sequence generated by kolinc for kotlin._Assertions. |
| // |
| // 0: new #2 // class kotlin/_Assertions |
| // 3: dup |
| // 4: invokespecial #31 // Method "<init>":()V |
| // 7: astore_0 |
| // 8: aload_0 |
| // 9: putstatic #33 // Field INSTANCE:Lkotlin/_Assertions; |
| // 12: aload_0 |
| // 13: invokevirtual #37 // Method java/lang/Object.getClass:()Ljava/lang/Class; |
| // 16: invokevirtual #43 // Method java/lang/Class.desiredAssertionStatus:()Z |
| // 19: putstatic #45 // Field ENABLED:Z |
| // 22: return |
| // |
| // When JaCoCo instrumentation is applied the following instruction sequence is injected into |
| // each branch to register code coverage. This includes <clinit> where the vsalue for field |
| // $assertionsDisabled is determined by a branch structure. |
| // |
| // +0: aload_X |
| // +1: iconst_Y / ldc |
| // +2: iconst_Z / ldc |
| // +3 bastore |
| |
| private static List<Class<?>> javacInstructionSequence = |
| ImmutableList.of( |
| CfIf.class, |
| CfConstNumber.class, |
| CfGoto.class, |
| CfConstNumber.class, |
| CfFieldInstruction.class); |
| private static List<Class<?>> r8InstructionSequence = |
| ImmutableList.of(CfConstNumber.class, CfLogicalBinop.class, CfFieldInstruction.class); |
| private static List<Class<?>> jacocoInstructionSequence = |
| ImmutableList.of(CfLoad.class, CfConstNumber.class, CfConstNumber.class, CfArrayStore.class); |
| |
| private boolean hasJavacClinitAssertionCode(CfCode code) { |
| for (int i = 0; i < code.getInstructions().size(); i++) { |
| CfInstruction instruction = code.getInstructions().get(i); |
| if (instruction.isInvoke()) { |
| // Check for the generated instruction sequence by looking for the call to |
| // desiredAssertionStatus() followed by the expected instruction types and finally checking |
| // the exact target of the putstatic ending the sequence. |
| CfInvoke invoke = instruction.asInvoke(); |
| if (invoke.getOpcode() == Opcodes.INVOKEVIRTUAL |
| && invoke.getMethod() == dexItemFactory.classMethods.desiredAssertionStatus) { |
| CfFieldInstruction fieldInstruction = isJavacInstructionSequence(code, i + 1); |
| if (fieldInstruction == null) { |
| fieldInstruction = isR8InstructionSequence(code, i + 1); |
| } |
| if (fieldInstruction != null) { |
| return fieldInstruction.getOpcode() == Opcodes.PUTSTATIC |
| && fieldInstruction.getField().name == dexItemFactory.assertionsDisabled; |
| } |
| } |
| } |
| // Only check initial straight line code. |
| if (instruction.isJump()) { |
| return false; |
| } |
| } |
| return false; |
| } |
| |
| private boolean hasKotlincClinitAssertionCode(ProgramMethod method) { |
| if (method.getHolderType() == dexItemFactory.kotlin.assertions.type) { |
| CfCode code = method.getDefinition().getCode().asCfCode(); |
| List<CfInstruction> instructions = code.getInstructions(); |
| for (int i = 1; i < instructions.size(); i++) { |
| CfInstruction instruction = instructions.get(i - 1); |
| if (instruction.isInvoke()) { |
| // Check for the generated instruction sequence by looking for the call to |
| // desiredAssertionStatus() followed by the expected instruction types and finally |
| // checking the exact target of the putstatic ending the sequence. |
| CfInvoke invoke = instruction.asInvoke(); |
| if (invoke.getOpcode() == Opcodes.INVOKEVIRTUAL |
| && invoke.getMethod() == dexItemFactory.classMethods.desiredAssertionStatus) { |
| if (instructions.get(i).isFieldInstruction()) { |
| CfFieldInstruction fieldInstruction = instructions.get(i).asFieldInstruction(); |
| if (fieldInstruction.getOpcode() == Opcodes.PUTSTATIC |
| && fieldInstruction.getField().name == kotlinAssertionsEnabled) { |
| return true; |
| } |
| } |
| } |
| } |
| // Only check initial straight line code. |
| if (instruction.isJump()) { |
| return false; |
| } |
| } |
| } |
| return false; |
| } |
| |
| private boolean skipSequence(List<Class<?>> sequence, CfCode code, int fromIndex) { |
| int i = fromIndex; |
| for (; i < code.getInstructions().size() && i - fromIndex < sequence.size(); i++) { |
| CfInstruction instruction = code.getInstructions().get(i); |
| if (instruction.getClass() != sequence.get(i - fromIndex)) { |
| return false; |
| } |
| } |
| return i - fromIndex == sequence.size(); |
| } |
| |
| private CfFieldInstruction isJavacInstructionSequence(CfCode code, int fromIndex) { |
| List<Class<?>> sequence = javacInstructionSequence; |
| int nextExpectedInstructionIndex = 0; |
| CfInstruction instruction = null; |
| for (int i = fromIndex; |
| i < code.getInstructions().size() && nextExpectedInstructionIndex < sequence.size(); |
| i++) { |
| instruction = code.getInstructions().get(i); |
| if (instruction.isLabel() || instruction.isFrame() || instruction.isPosition()) { |
| // Just ignore labels, frames and positions. |
| continue; |
| } |
| if (instruction.getClass() != sequence.get(nextExpectedInstructionIndex)) { |
| // Skip injected JaCoCo injected code. |
| if (instruction.getClass() == jacocoInstructionSequence.get(0) |
| && skipSequence(jacocoInstructionSequence, code, i)) { |
| i += jacocoInstructionSequence.size(); |
| if (i >= code.getInstructions().size()) { |
| break; |
| } |
| instruction = code.getInstructions().get(i); |
| } |
| if (instruction.isLabel() || instruction.isFrame() || instruction.isPosition()) { |
| // Just ignore labels, frames and positions. |
| continue; |
| } |
| if (instruction.getClass() != sequence.get(nextExpectedInstructionIndex)) { |
| break; |
| } |
| } |
| nextExpectedInstructionIndex++; |
| } |
| return nextExpectedInstructionIndex == sequence.size() |
| ? instruction.asFieldInstruction() |
| : null; |
| } |
| |
| private CfFieldInstruction isR8InstructionSequence(CfCode code, int fromIndex) { |
| List<Class<?>> sequence = r8InstructionSequence; |
| int nextExpectedInstructionIndex = 0; |
| CfInstruction instruction = null; |
| for (int i = fromIndex; |
| i < code.getInstructions().size() && nextExpectedInstructionIndex < sequence.size(); |
| i++) { |
| instruction = code.getInstructions().get(i); |
| if (instruction.isStore() || instruction.isLoad()) { |
| // Just ignore stores and loads. |
| continue; |
| } |
| if (instruction.getClass() != sequence.get(nextExpectedInstructionIndex)) { |
| break; |
| } |
| nextExpectedInstructionIndex++; |
| } |
| return nextExpectedInstructionIndex == sequence.size() |
| ? instruction.asFieldInstruction() |
| : null; |
| } |
| } |
