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Code Issues 7 Pull Requests Releases Activity

Deeper sanity checks of inconsistent inner classes (anonymous vs. local)

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master
upnotes 6 years ago committed by Roman Shevchenko
parent 290eae5218
commit 44bfa867e5
2 changed files with 102 additions and 14 deletions
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  1. 109
      src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
  2. 7
      src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java

109
src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
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@ -2,6 +2,8 @@
package org.jetbrains.java.decompiler.main;
import org.jetbrains.java.decompiler.code.CodeConstants;
import org.jetbrains.java.decompiler.code.Instruction;
import org.jetbrains.java.decompiler.code.InstructionSequence;
import org.jetbrains.java.decompiler.main.collectors.BytecodeSourceMapper;
import org.jetbrains.java.decompiler.main.collectors.ImportCollector;
import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
@ -18,6 +20,7 @@ import org.jetbrains.java.decompiler.struct.StructContext;
import org.jetbrains.java.decompiler.struct.StructMethod;
import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
import org.jetbrains.java.decompiler.struct.attr.StructInnerClassesAttribute;
import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
import org.jetbrains.java.decompiler.struct.gen.VarType;
import org.jetbrains.java.decompiler.util.InterpreterUtil;
import org.jetbrains.java.decompiler.util.TextBuffer;
@ -26,7 +29,7 @@ import java.io.IOException;
import java.util.*;
import java.util.Map.Entry;
public class ClassesProcessor {
public class ClassesProcessor implements CodeConstants {
public static final int AVERAGE_CLASS_SIZE = 16 * 1024;
private final StructContext context;
@ -171,20 +174,24 @@ public class ClassesProcessor {
if (nestedNode.type == ClassNode.CLASS_ANONYMOUS) {
StructClass cl = nestedNode.classStruct;
// remove static if anonymous class (a common compiler bug)
nestedNode.access &= ~CodeConstants.ACC_STATIC;
int[] interfaces = cl.getInterfaces();
if (interfaces.length > 0) {
if (interfaces.length > 1) {
String message = "Inconsistent anonymous class definition: " + cl.qualifiedName;
DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
// sanity checks of the class supposed to be anonymous
boolean isAnonymousChecked = checkClassAnonymous(cl, scl);
if(isAnonymousChecked) {
// remove static if anonymous class (a common compiler bug)
nestedNode.access &= ~CodeConstants.ACC_STATIC;
if (interfaces.length > 0) {
nestedNode.anonymousClassType = new VarType(cl.getInterface(0), true);
}
nestedNode.anonymousClassType = new VarType(cl.getInterface(0), true);
}
else {
nestedNode.anonymousClassType = new VarType(cl.superClass.getString(), true);
else {
nestedNode.anonymousClassType = new VarType(cl.superClass.getString(), true);
}
} else { // change it to a local class
nestedNode.type = ClassNode.CLASS_LOCAL;
nestedNode.access &= (CodeConstants.ACC_ABSTRACT | CodeConstants.ACC_FINAL);
}
}
else if (nestedNode.type == ClassNode.CLASS_LOCAL) {
@ -205,6 +212,84 @@ public class ClassesProcessor {
}
}
}
private boolean checkClassAnonymous(StructClass cl, StructClass enclosing_cl) {
int[] interfaces = cl.getInterfaces();
boolean hasNonTrivialSuperClass = cl.superClass != null && !VarType.VARTYPE_OBJECT.equals(new VarType(cl.superClass.getString(), true));
// checking super class and interfaces
if(interfaces.length > 0) {
if(hasNonTrivialSuperClass || interfaces.length > 1) { // can't have multiple 'sources'
String message = "Inconsistent anonymous class definition: '" + cl.qualifiedName+"'. Multiple interfaces and/or super class defined.";
DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
return false;
}
} else if(cl.superClass == null) { // neither interface nor super class defined
String message = "Inconsistent anonymous class definition: '" + cl.qualifiedName+"'. Neither interface nor super class defined.";
DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
return false;
}
// FIXME: check constructors
// FIXME: check enclosing class/method
ConstantPool pool = enclosing_cl.getPool();
int ref_counter = 0;
boolean ref_not_new = false;
// checking references in the enclosing class (TODO: limit to the enclosing method?)
for (StructMethod mt : enclosing_cl.getMethods()) {
try {
mt.expandData();
InstructionSequence seq = mt.getInstructionSequence();
int len = seq.length();
for (int i = 0; i < len; i++) {
Instruction instr = seq.getInstr(i);
switch(instr.opcode) {
case opc_checkcast:
case opc_instanceof:
if(cl.qualifiedName.equals(pool.getPrimitiveConstant(instr.operand(0)).getString())) {
ref_counter++;
ref_not_new = true;
}
break;
case opc_new:
case opc_anewarray:
case opc_multianewarray:
if(cl.qualifiedName.equals(pool.getPrimitiveConstant(instr.operand(0)).getString())) {
ref_counter++;
}
break;
case opc_getstatic:
case opc_putstatic:
if(cl.qualifiedName.equals(pool.getLinkConstant(instr.operand(0)).classname)) {
ref_counter++;
ref_not_new = true;
}
}
}
mt.releaseResources();
} catch(IOException ex) {
String message = "Could not read method while checking anonymous class definition: '"+enclosing_cl.qualifiedName+"', '"+
InterpreterUtil.makeUniqueKey(mt.getName(), mt.getDescriptor())+"'";
DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
return false;
}
if(ref_counter > 1 || ref_not_new) {
String message = "Inconsistent references to the class '"+cl.qualifiedName+"' which is supposed to be anonymous";
DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
return false;
}
}
return true;
}
public void writeClass(StructClass cl, TextBuffer buffer) throws IOException {
ClassNode root = mapRootClasses.get(cl.qualifiedName);

7
src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java
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@ -72,8 +72,11 @@ public class NestedClassProcessor {
else if (child.type != ClassNode.CLASS_MEMBER || (child.access & CodeConstants.ACC_STATIC) == 0) {
insertLocalVars(node, child);
if (child.type == ClassNode.CLASS_LOCAL) {
setLocalClassDefinition(node.getWrapper().getMethods().getWithKey(child.enclosingMethod), child);
if (child.type == ClassNode.CLASS_LOCAL && child.enclosingMethod != null) {
MethodWrapper enclosingMethodWrapper = node.getWrapper().getMethods().getWithKey(child.enclosingMethod);
if(enclosingMethodWrapper != null) { // e.g. in case of switch-on-enum. FIXME: some proper handling of multiple enclosing classes
setLocalClassDefinition(enclosingMethodWrapper, child);
}
}
}
}

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