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Diffstat (limited to 'third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/EnumFieldReferenceInitializer.java')
| -rw-r--r-- | third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/EnumFieldReferenceInitializer.java | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/EnumFieldReferenceInitializer.java b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/EnumFieldReferenceInitializer.java new file mode 100644 index 0000000000..a633d43ae0 --- /dev/null +++ b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/util/EnumFieldReferenceInitializer.java @@ -0,0 +1,149 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare + * + * 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.util; + +import proguard.classfile.*; +import proguard.classfile.attribute.CodeAttribute; +import proguard.classfile.attribute.annotation.*; +import proguard.classfile.attribute.annotation.visitor.ElementValueVisitor; +import proguard.classfile.attribute.visitor.AllAttributeVisitor; +import proguard.classfile.constant.*; +import proguard.classfile.constant.visitor.ConstantVisitor; +import proguard.classfile.instruction.*; +import proguard.classfile.instruction.visitor.*; +import proguard.classfile.visitor.MemberVisitor; + +/** + * This ElementValueVisitor initializes the field references of the + * EnumConstantElementValue instances that it visits. + * + * @author Eric Lafortune + */ +public class EnumFieldReferenceInitializer +extends SimplifiedVisitor +implements ElementValueVisitor, + InstructionVisitor, + ConstantVisitor +{ + //* + private static final boolean DEBUG = false; + /*/ + private static boolean DEBUG = true; + //*/ + + private MemberVisitor enumFieldFinder = new AllAttributeVisitor( + new AllInstructionVisitor(this)); + + // Fields acting as parameters and return values for the visitors. + private String enumTypeName; + private String enumConstantName; + private boolean enumConstantNameFound; + private Clazz referencedEnumClass; + private Field referencedEnumField; + + + // Implementations for ElementValueVisitor. + + public void visitAnyElementValue(Clazz clazz, Annotation annotation, ElementValue elementValue) {} + + + public void visitEnumConstantElementValue(Clazz clazz, Annotation annotation, EnumConstantElementValue enumConstantElementValue) + { + + if (enumConstantElementValue.referencedClasses != null && + enumConstantElementValue.referencedClasses.length > 0) + { + referencedEnumClass = enumConstantElementValue.referencedClasses[0]; + if (referencedEnumClass != null) + { + // Try to find the enum field through the static enum + // initialization code (at least for program classes). + enumTypeName = enumConstantElementValue.getTypeName(clazz); + enumConstantName = enumConstantElementValue.getConstantName(clazz); + referencedEnumField = null; + referencedEnumClass.methodAccept(ClassConstants.METHOD_NAME_CLINIT, + ClassConstants.METHOD_TYPE_CLINIT, + enumFieldFinder); + + // Otherwise try to find the enum field through its name. + // The constant name could be different from the field name, if + // the latter is already obfuscated. + if (referencedEnumField == null) + { + referencedEnumField = + referencedEnumClass.findField(enumConstantName, + enumTypeName); + } + + if (DEBUG) + { + System.out.println("EnumFieldReferenceInitializer: ["+referencedEnumClass.getName()+"."+enumConstantName+"] -> "+referencedEnumField); + } + + enumConstantElementValue.referencedField = referencedEnumField; + } + } + } + + + // 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) + { + switch (constantInstruction.opcode) + { + case InstructionConstants.OP_LDC: + case InstructionConstants.OP_LDC_W: + case InstructionConstants.OP_PUTSTATIC: + clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this); + break; + } + } + + + // Implementations for ConstantVisitor. + + public void visitAnyConstant(Clazz clazz, Constant constant) {} + + + public void visitStringConstant(Clazz clazz, StringConstant stringConstant) + { + enumConstantNameFound = + enumConstantName.equals(stringConstant.getString(clazz)); + } + + + public void visitFieldrefConstant(Clazz clazz, FieldrefConstant fieldrefConstant) + { + if (enumConstantNameFound) + { + if (enumTypeName.equals(fieldrefConstant.getType(clazz))) + { + referencedEnumField = (Field)fieldrefConstant.referencedMember; + } + + enumConstantNameFound = false; + } + } +}
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