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package cuchaz.enigma.analysis.index;
import cuchaz.enigma.analysis.IndexSimpleVerifier;
import cuchaz.enigma.analysis.InterpreterPair;
import cuchaz.enigma.analysis.MethodNodeWithAction;
import cuchaz.enigma.analysis.ReferenceTargetType;
import cuchaz.enigma.translation.representation.AccessFlags;
import cuchaz.enigma.translation.representation.Lambda;
import cuchaz.enigma.translation.representation.MethodDescriptor;
import cuchaz.enigma.translation.representation.Signature;
import cuchaz.enigma.translation.representation.entry.*;
import org.objectweb.asm.*;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.FieldInsnNode;
import org.objectweb.asm.tree.InvokeDynamicInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.analysis.*;
import java.util.List;
import java.util.stream.Collectors;
public class IndexReferenceVisitor extends ClassVisitor {
private final JarIndexer indexer;
private final EntryIndex entryIndex;
private final InheritanceIndex inheritanceIndex;
private ClassEntry classEntry;
private String className;
public IndexReferenceVisitor(JarIndexer indexer, EntryIndex entryIndex, InheritanceIndex inheritanceIndex, int api) {
super(api);
this.indexer = indexer;
this.entryIndex = entryIndex;
this.inheritanceIndex = inheritanceIndex;
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
classEntry = new ClassEntry(name);
className = name;
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodDefEntry entry = new MethodDefEntry(classEntry, name, new MethodDescriptor(desc), Signature.createSignature(signature), new AccessFlags(access));
return new MethodNodeWithAction(api, access, name, desc, signature, exceptions, methodNode -> {
try {
new Analyzer<>(new MethodInterpreter(entry, indexer, entryIndex, inheritanceIndex)).analyze(className, methodNode);
} catch (AnalyzerException e) {
throw new RuntimeException(e);
}
});
}
private static class MethodInterpreter extends InterpreterPair<BasicValue, SourceValue> {
private final MethodDefEntry callerEntry;
private JarIndexer indexer;
public MethodInterpreter(MethodDefEntry callerEntry, JarIndexer indexer, EntryIndex entryIndex, InheritanceIndex inheritanceIndex) {
super(new IndexSimpleVerifier(entryIndex, inheritanceIndex), new SourceInterpreter());
this.callerEntry = callerEntry;
this.indexer = indexer;
}
@Override
public PairValue<BasicValue, SourceValue> newOperation(AbstractInsnNode insn) throws AnalyzerException {
if (insn.getOpcode() == Opcodes.GETSTATIC) {
FieldInsnNode field = (FieldInsnNode) insn;
indexer.indexFieldReference(callerEntry, FieldEntry.parse(field.owner, field.name, field.desc), ReferenceTargetType.none());
}
return super.newOperation(insn);
}
@Override
public PairValue<BasicValue, SourceValue> unaryOperation(AbstractInsnNode insn, PairValue<BasicValue, SourceValue> value) throws AnalyzerException {
if (insn.getOpcode() == Opcodes.PUTSTATIC) {
FieldInsnNode field = (FieldInsnNode) insn;
indexer.indexFieldReference(callerEntry, FieldEntry.parse(field.owner, field.name, field.desc), ReferenceTargetType.none());
}
if (insn.getOpcode() == Opcodes.GETFIELD) {
FieldInsnNode field = (FieldInsnNode) insn;
indexer.indexFieldReference(callerEntry, FieldEntry.parse(field.owner, field.name, field.desc), getReferenceTargetType(value, insn));
}
return super.unaryOperation(insn, value);
}
@Override
public PairValue<BasicValue, SourceValue> binaryOperation(AbstractInsnNode insn, PairValue<BasicValue, SourceValue> value1, PairValue<BasicValue, SourceValue> value2) throws AnalyzerException {
if (insn.getOpcode() == Opcodes.PUTFIELD) {
FieldInsnNode field = (FieldInsnNode) insn;
FieldEntry fieldEntry = FieldEntry.parse(field.owner, field.name, field.desc);
indexer.indexFieldReference(callerEntry, fieldEntry, ReferenceTargetType.none());
}
return super.binaryOperation(insn, value1, value2);
}
@Override
public PairValue<BasicValue, SourceValue> naryOperation(AbstractInsnNode insn, List<? extends PairValue<BasicValue, SourceValue>> values) throws AnalyzerException {
if (insn.getOpcode() == Opcodes.INVOKEINTERFACE || insn.getOpcode() == Opcodes.INVOKESPECIAL || insn.getOpcode() == Opcodes.INVOKEVIRTUAL) {
MethodInsnNode methodInsn = (MethodInsnNode) insn;
indexer.indexMethodReference(callerEntry, MethodEntry.parse(methodInsn.owner, methodInsn.name, methodInsn.desc), getReferenceTargetType(values.get(0), insn));
}
if (insn.getOpcode() == Opcodes.INVOKESTATIC) {
MethodInsnNode methodInsn = (MethodInsnNode) insn;
indexer.indexMethodReference(callerEntry, MethodEntry.parse(methodInsn.owner, methodInsn.name, methodInsn.desc), ReferenceTargetType.none());
}
if (insn.getOpcode() == Opcodes.INVOKEDYNAMIC) {
InvokeDynamicInsnNode invokeDynamicInsn = (InvokeDynamicInsnNode) insn;
List<AbstractInsnNode> args = values.stream().map(v -> v.right.insns.stream().findFirst().orElseThrow(AssertionError::new)).collect(Collectors.toList());
if ("java/lang/invoke/LambdaMetafactory".equals(invokeDynamicInsn.bsm.getOwner()) && "metafactory".equals(invokeDynamicInsn.bsm.getName())) {
Type samMethodType = (Type) invokeDynamicInsn.bsmArgs[0];
Handle implMethod = (Handle) invokeDynamicInsn.bsmArgs[1];
Type instantiatedMethodType = (Type) invokeDynamicInsn.bsmArgs[2];
ReferenceTargetType targetType;
if (implMethod.getTag() != Opcodes.H_GETSTATIC && implMethod.getTag() != Opcodes.H_PUTFIELD && implMethod.getTag() != Opcodes.H_INVOKESTATIC) {
if (instantiatedMethodType.getArgumentTypes().length < Type.getArgumentTypes(implMethod.getDesc()).length) {
targetType = getReferenceTargetType(values.get(0), insn);
} else {
targetType = ReferenceTargetType.none(); // no "this" argument
}
} else {
targetType = ReferenceTargetType.none();
}
indexer.indexLambda(callerEntry, new Lambda(
invokeDynamicInsn.name,
new MethodDescriptor(invokeDynamicInsn.desc),
new MethodDescriptor(samMethodType.getDescriptor()),
getHandleEntry(implMethod),
new MethodDescriptor(instantiatedMethodType.getDescriptor())
), targetType);
}
}
return super.naryOperation(insn, values);
}
private ReferenceTargetType getReferenceTargetType(PairValue<BasicValue, SourceValue> target, AbstractInsnNode insn) throws AnalyzerException {
if (target.left == BasicValue.UNINITIALIZED_VALUE) {
return ReferenceTargetType.uninitialized();
}
if (target.left.getType().getSort() == Type.OBJECT) {
return ReferenceTargetType.classType(new ClassEntry(target.left.getType().getInternalName()));
}
if (target.left.getType().getSort() == Type.ARRAY) {
return ReferenceTargetType.classType(new ClassEntry("java/lang/Object"));
}
throw new AnalyzerException(insn, "called method on or accessed field of non-object type");
}
private static ParentedEntry<?> getHandleEntry(Handle handle) {
switch (handle.getTag()) {
case Opcodes.H_GETFIELD:
case Opcodes.H_GETSTATIC:
case Opcodes.H_PUTFIELD:
case Opcodes.H_PUTSTATIC:
return FieldEntry.parse(handle.getOwner(), handle.getName(), handle.getDesc());
case Opcodes.H_INVOKEINTERFACE:
case Opcodes.H_INVOKESPECIAL:
case Opcodes.H_INVOKESTATIC:
case Opcodes.H_INVOKEVIRTUAL:
case Opcodes.H_NEWINVOKESPECIAL:
return MethodEntry.parse(handle.getOwner(), handle.getName(), handle.getDesc());
}
throw new RuntimeException("Invalid handle tag " + handle.getTag());
}
}
}
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