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-rw-r--r--src/proguard/classfile/editor/MethodInvocationFixer.java243
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diff --git a/src/proguard/classfile/editor/MethodInvocationFixer.java b/src/proguard/classfile/editor/MethodInvocationFixer.java
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--- a/src/proguard/classfile/editor/MethodInvocationFixer.java
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-/*
- * ProGuard -- shrinking, optimization, obfuscation, and preverification
- * of Java bytecode.
- *
- * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-package proguard.classfile.editor;
-
-import proguard.classfile.*;
-import proguard.classfile.attribute.*;
-import proguard.classfile.attribute.visitor.AttributeVisitor;
-import proguard.classfile.constant.*;
-import proguard.classfile.constant.visitor.ConstantVisitor;
-import proguard.classfile.instruction.*;
-import proguard.classfile.instruction.visitor.InstructionVisitor;
-import proguard.classfile.util.*;
-
-/**
- * This AttributeVisitor fixes all inappropriate special/virtual/static/interface
- * invocations of the code attributes that it visits.
- *
- * @author Eric Lafortune
- */
-public class MethodInvocationFixer
-extends SimplifiedVisitor
-implements AttributeVisitor,
- InstructionVisitor,
- ConstantVisitor
-{
- private static final boolean DEBUG = false;
-
-
- private final CodeAttributeEditor codeAttributeEditor = new CodeAttributeEditor();
-
- // Return values for the visitor methods.
- private Clazz referencedClass;
- private Clazz referencedMethodClass;
- private Member referencedMethod;
-
-
- // Implementations for AttributeVisitor.
-
- public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
-
-
- public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
- {
- // Reset the code attribute editor.
- codeAttributeEditor.reset(codeAttribute.u4codeLength);
-
- // Remap the variables of the instructions.
- codeAttribute.instructionsAccept(clazz, method, this);
-
- // Apply the code atribute editor.
- codeAttributeEditor.visitCodeAttribute(clazz, method, codeAttribute);
- }
-
-
- // Implementations for InstructionVisitor.
-
- public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {}
-
-
- public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)
- {
- int constantIndex = constantInstruction.constantIndex;
-
- // Get information on the called class and method, if present.
- referencedMethod = null;
-
- clazz.constantPoolEntryAccept(constantIndex, this);
-
- // Did we find the called class and method?
- if (referencedClass != null &&
- referencedMethod != null)
- {
- // Do we need to update the opcode?
- byte opcode = constantInstruction.opcode;
-
- // Is the method static?
- if ((referencedMethod.getAccessFlags() & ClassConstants.ACC_STATIC) != 0)
- {
- // But is it not a static invocation?
- if (opcode != InstructionConstants.OP_INVOKESTATIC)
- {
- // Replace the invocation by an invokestatic instruction.
- Instruction replacementInstruction =
- new ConstantInstruction(InstructionConstants.OP_INVOKESTATIC,
- constantIndex);
-
- codeAttributeEditor.replaceInstruction(offset, replacementInstruction);
-
- if (DEBUG)
- {
- debug(clazz, method, offset, constantInstruction, replacementInstruction);
- }
- }
- }
-
- // Is the method private, or an instance initializer?
- else if ((referencedMethod.getAccessFlags() & ClassConstants.ACC_PRIVATE) != 0 ||
- referencedMethod.getName(referencedMethodClass).equals(ClassConstants.METHOD_NAME_INIT))
- {
- // But is it not a special invocation?
- if (opcode != InstructionConstants.OP_INVOKESPECIAL)
- {
- // Replace the invocation by an invokespecial instruction.
- Instruction replacementInstruction =
- new ConstantInstruction(InstructionConstants.OP_INVOKESPECIAL,
- constantIndex);
-
- codeAttributeEditor.replaceInstruction(offset, replacementInstruction);
-
- if (DEBUG)
- {
- debug(clazz, method, offset, constantInstruction, replacementInstruction);
- }
- }
- }
-
- // Is the method an interface method?
- else if ((referencedClass.getAccessFlags() & ClassConstants.ACC_INTERFACE) != 0)
- {
- int invokeinterfaceConstant =
- (ClassUtil.internalMethodParameterSize(referencedMethod.getDescriptor(referencedMethodClass), false)) << 8;
-
- // But is it not an interface invocation, or is the parameter
- // size incorrect?
- if (opcode != InstructionConstants.OP_INVOKEINTERFACE ||
- constantInstruction.constant != invokeinterfaceConstant)
- {
- // Fix the parameter size of the interface invocation.
- Instruction replacementInstruction =
- new ConstantInstruction(InstructionConstants.OP_INVOKEINTERFACE,
- constantIndex,
- invokeinterfaceConstant);
-
- codeAttributeEditor.replaceInstruction(offset, replacementInstruction);
-
- if (DEBUG)
- {
- debug(clazz, method, offset, constantInstruction, replacementInstruction);
- }
- }
- }
-
- // The method is not static, private, an instance initializer, or
- // an interface method.
- else
- {
- // But is it not a virtual invocation (or a special invocation,
- // but not a super call)?
- if (opcode != InstructionConstants.OP_INVOKEVIRTUAL &&
- (opcode != InstructionConstants.OP_INVOKESPECIAL ||
- clazz.equals(referencedClass) ||
- !clazz.extends_(referencedClass)))
- {
- // Replace the invocation by an invokevirtual instruction.
- Instruction replacementInstruction =
- new ConstantInstruction(InstructionConstants.OP_INVOKEVIRTUAL,
- constantIndex);
-
- codeAttributeEditor.replaceInstruction(offset, replacementInstruction);
-
- if (DEBUG)
- {
- debug(clazz, method, offset, constantInstruction, replacementInstruction);
- }
- }
- }
- }
- }
-
-
- // Implementations for ConstantVisitor.
-
- public void visitAnyConstant(Clazz clazz, Constant constant) {}
-
-
- public void visitAnyMethodrefConstant(Clazz clazz, RefConstant refConstant)
- {
- // Remember the referenced class. Note that we're interested in the
- // class of the method reference, not in the class in which the
- // method was actually found, unless it is an array type.
- //
- if (ClassUtil.isInternalArrayType(refConstant.getClassName(clazz)))
- {
- // For an array type, the class will be java.lang.Object.
- referencedClass = refConstant.referencedClass;
- }
- else
- {
- clazz.constantPoolEntryAccept(refConstant.u2classIndex, this);
- }
-
- // Remember the referenced method.
- referencedMethodClass = refConstant.referencedClass;
- referencedMethod = refConstant.referencedMember;
- }
-
-
- public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
- {
- // Remember the referenced class.
- referencedClass = classConstant.referencedClass;
- }
-
-
- // Small utility methods.
-
- private void debug(Clazz clazz,
- Method method,
- int offset,
- ConstantInstruction constantInstruction,
- Instruction replacementInstruction)
- {
- System.out.println("MethodInvocationFixer:");
- System.out.println(" Class = "+clazz.getName());
- System.out.println(" Method = "+method.getName(clazz)+method.getDescriptor(clazz));
- System.out.println(" Instruction = "+constantInstruction.toString(offset));
- System.out.println(" -> Class = "+referencedClass);
- System.out.println(" Method = "+referencedMethod);
- if ((referencedClass.getAccessFlags() & ClassConstants.ACC_INTERFACE) != 0)
- {
- System.out.println(" Parameter size = "+(ClassUtil.internalMethodParameterSize(referencedMethod.getDescriptor(referencedMethodClass), false)));
- }
- System.out.println(" Replacement instruction = "+replacementInstruction.toString(offset));
- }
-}
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