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/*******************************************************************************
* Copyright (c) 2015 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Lesser General Public
* License v3.0 which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/lgpl.html
* <p>
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.analysis;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.strobel.assembler.metadata.*;
import com.strobel.decompiler.ast.Variable;
import com.strobel.decompiler.languages.TextLocation;
import com.strobel.decompiler.languages.java.ast.*;
import cuchaz.enigma.translation.representation.TypeDescriptor;
import cuchaz.enigma.translation.representation.*;
import cuchaz.enigma.translation.representation.entry.*;
import java.lang.Error;
import java.util.HashMap;
import java.util.Map;
public class SourceIndexMethodVisitor extends SourceIndexVisitor {
private final ReferencedEntryPool entryPool;
private final MethodDefEntry methodEntry;
private Multimap<String, Identifier> unmatchedIdentifier = HashMultimap.create();
private Map<String, Entry<?>> identifierEntryCache = new HashMap<>();
public SourceIndexMethodVisitor(ReferencedEntryPool entryPool, MethodDefEntry methodEntry) {
super(entryPool);
this.entryPool = entryPool;
this.methodEntry = methodEntry;
}
@Override
public Void visitInvocationExpression(InvocationExpression node, SourceIndex index) {
MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
// get the behavior entry
ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
MethodEntry methodEntry = null;
if (ref instanceof MethodReference) {
methodEntry = entryPool.getMethod(classEntry, ref.getName(), ref.getErasedSignature());
}
if (methodEntry != null) {
// get the node for the token
AstNode tokenNode = null;
if (node.getTarget() instanceof MemberReferenceExpression) {
tokenNode = ((MemberReferenceExpression) node.getTarget()).getMemberNameToken();
} else if (node.getTarget() instanceof SuperReferenceExpression) {
tokenNode = node.getTarget();
} else if (node.getTarget() instanceof ThisReferenceExpression) {
tokenNode = node.getTarget();
}
if (tokenNode != null) {
index.addReference(tokenNode, methodEntry, this.methodEntry);
}
}
// Check for identifier
node.getArguments().stream().filter(expression -> expression instanceof IdentifierExpression)
.forEach(expression -> this.checkIdentifier((IdentifierExpression) expression, index));
return recurse(node, index);
}
@Override
public Void visitMemberReferenceExpression(MemberReferenceExpression node, SourceIndex index) {
MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
if (ref instanceof FieldReference) {
// make sure this is actually a field
String erasedSignature = ref.getErasedSignature();
if (erasedSignature.indexOf('(') >= 0) {
throw new Error("Expected a field here! got " + ref);
}
ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
FieldEntry fieldEntry = entryPool.getField(classEntry, ref.getName(), new TypeDescriptor(erasedSignature));
if (fieldEntry == null) {
throw new Error("Failed to find field " + ref.getName() + " on " + classEntry.getFullName());
}
index.addReference(node.getMemberNameToken(), fieldEntry, this.methodEntry);
}
return recurse(node, index);
}
@Override
public Void visitSimpleType(SimpleType node, SourceIndex index) {
TypeReference ref = node.getUserData(Keys.TYPE_REFERENCE);
if (node.getIdentifierToken().getStartLocation() != TextLocation.EMPTY) {
ClassEntry classEntry = entryPool.getClass(ref.getInternalName());
index.addReference(node.getIdentifierToken(), classEntry, this.methodEntry);
}
return recurse(node, index);
}
@Override
public Void visitParameterDeclaration(ParameterDeclaration node, SourceIndex index) {
ParameterDefinition def = node.getUserData(Keys.PARAMETER_DEFINITION);
int parameterIndex = def.getSlot();
if (parameterIndex >= 0) {
LocalVariableEntry localVariableEntry = new LocalVariableEntry(methodEntry, parameterIndex, node.getName(), true);
Identifier identifier = node.getNameToken();
// cache the argument entry and the identifier
identifierEntryCache.put(identifier.getName(), localVariableEntry);
index.addDeclaration(identifier, localVariableEntry);
}
return recurse(node, index);
}
@Override
public Void visitIdentifierExpression(IdentifierExpression node, SourceIndex index) {
MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
if (ref != null) {
ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
FieldEntry fieldEntry = entryPool.getField(classEntry, ref.getName(), new TypeDescriptor(ref.getErasedSignature()));
if (fieldEntry == null) {
throw new Error("Failed to find field " + ref.getName() + " on " + classEntry.getFullName());
}
index.addReference(node.getIdentifierToken(), fieldEntry, this.methodEntry);
} else
this.checkIdentifier(node, index);
return recurse(node, index);
}
private void checkIdentifier(IdentifierExpression node, SourceIndex index) {
if (identifierEntryCache.containsKey(node.getIdentifier())) // If it's in the argument cache, create a token!
index.addDeclaration(node.getIdentifierToken(), identifierEntryCache.get(node.getIdentifier()));
else
unmatchedIdentifier.put(node.getIdentifier(), node.getIdentifierToken()); // Not matched actually, put it!
}
private void addDeclarationToUnmatched(String key, SourceIndex index) {
Entry<?> entry = identifierEntryCache.get(key);
// This cannot happened in theory
if (entry == null)
return;
for (Identifier identifier : unmatchedIdentifier.get(key))
index.addDeclaration(identifier, entry);
unmatchedIdentifier.removeAll(key);
}
@Override
public Void visitObjectCreationExpression(ObjectCreationExpression node, SourceIndex index) {
MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
if (ref != null) {
ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
MethodEntry constructorEntry = entryPool.getMethod(classEntry, "<init>", ref.getErasedSignature());
if (node.getType() instanceof SimpleType) {
SimpleType simpleTypeNode = (SimpleType) node.getType();
index.addReference(simpleTypeNode.getIdentifierToken(), constructorEntry, this.methodEntry);
}
}
return recurse(node, index);
}
@Override
public Void visitVariableDeclaration(VariableDeclarationStatement node, SourceIndex index) {
AstNodeCollection<VariableInitializer> variables = node.getVariables();
// Single assignation
if (variables.size() == 1) {
VariableInitializer initializer = variables.firstOrNullObject();
if (initializer != null && node.getType() instanceof SimpleType) {
Identifier identifier = initializer.getNameToken();
Variable variable = initializer.getUserData(Keys.VARIABLE);
if (variable != null) {
VariableDefinition originalVariable = variable.getOriginalVariable();
if (originalVariable != null) {
int variableIndex = originalVariable.getSlot();
if (variableIndex >= 0) {
LocalVariableEntry localVariableEntry = new LocalVariableEntry(methodEntry, variableIndex, initializer.getName(), false);
identifierEntryCache.put(identifier.getName(), localVariableEntry);
addDeclarationToUnmatched(identifier.getName(), index);
index.addDeclaration(identifier, localVariableEntry);
}
}
}
}
}
return recurse(node, index);
}
@Override
public Void visitMethodGroupExpression(MethodGroupExpression node, SourceIndex index) {
MemberReference ref = node.getUserData(Keys.MEMBER_REFERENCE);
if (ref instanceof MethodReference) {
// get the behavior entry
ClassEntry classEntry = entryPool.getClass(ref.getDeclaringType().getInternalName());
MethodEntry methodEntry = null;
methodEntry = entryPool.getMethod(classEntry, ref.getName(), ref.getErasedSignature());
// get the node for the token
AstNode tokenNode = node.getMethodNameToken();
if (tokenNode == null || (tokenNode.getRegion().getBeginLine() == 0 || tokenNode.getRegion().getEndLine() == 0)){
tokenNode = node.getTarget();
}
if (tokenNode != null) {
index.addReference(tokenNode, methodEntry, this.methodEntry);
}
}
return recurse(node, index);
}
}
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