191 lines
6.2 KiB
Java
191 lines
6.2 KiB
Java
/*******************************************************************************
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* Copyright (c) 2011 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.cast.js.test;
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import static com.ibm.wala.cast.tree.CAstNode.ASSIGN;
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import static com.ibm.wala.cast.tree.CAstNode.BLOCK_EXPR;
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import static com.ibm.wala.cast.tree.CAstNode.BLOCK_STMT;
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import static com.ibm.wala.cast.tree.CAstNode.EMPTY;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Map;
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import java.util.Map.Entry;
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import com.ibm.wala.cast.js.ipa.callgraph.correlations.extraction.NodeLabeller;
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import com.ibm.wala.cast.tree.CAstControlFlowMap;
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import com.ibm.wala.cast.tree.CAstEntity;
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import com.ibm.wala.cast.tree.CAstNode;
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import com.ibm.wala.cast.util.CAstPrinter;
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import com.ibm.wala.util.collections.HashMapFactory;
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/**
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* A class for dumping a textual representation of a CAst syntax tree.
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*
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* <p>Similar to {@link CAstPrinter}, but additionally prints control flow information.</p>
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*
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* <p>It also suppresses certain kinds of spurious nodes such as empty statements within a block or
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* block expressions with a single child, which are simply artifacts of the translation process. This
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* is not nice, but needed for our tests.</p>
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*
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* @author mschaefer
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*
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*/
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public class CAstDumper {
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private static final boolean NORMALISE = false;
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private final NodeLabeller labeller;
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public CAstDumper() {
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labeller = new NodeLabeller();
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}
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public CAstDumper(NodeLabeller labeller) {
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this.labeller = labeller;
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}
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private static String indent(int indent) {
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StringBuilder buf = new StringBuilder();
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for(int i=0;i<indent;++i)
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buf.append(' ');
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return buf.toString();
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}
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public String dump(CAstEntity entity) {
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StringBuilder buf = new StringBuilder();
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dump(entity, 0, buf);
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return buf.toString();
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}
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private void dump(CAstEntity entity, int indent, StringBuilder buf) {
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Collection<CAstEntity> scopedEntities = Collections.emptySet();
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if(entity.getKind() == CAstEntity.SCRIPT_ENTITY) {
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buf.append(indent(indent) + entity.getName() + ":\n");
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scopedEntities = dumpScopedEntities(entity, indent+2, buf);
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dump(entity.getAST(), indent, buf, entity.getControlFlow());
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} else if(entity.getKind() == CAstEntity.FUNCTION_ENTITY) {
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buf.append(indent(indent) + "function " + entity.getName() + "(");
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for(int i=0;i<entity.getArgumentCount();++i) {
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if(i>0)
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buf.append(", ");
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buf.append(entity.getArgumentNames()[i]);
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}
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buf.append(") {\n");
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scopedEntities = dumpScopedEntities(entity, indent+2, buf);
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dump(entity.getAST(), indent+2, buf, entity.getControlFlow());
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buf.append(indent(indent) + "}\n\n");
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} else {
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throw new Error("Unknown entity kind " + entity.getKind());
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}
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for(CAstEntity scopedEntity : scopedEntities)
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dump(scopedEntity, indent, buf);
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}
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private Collection<CAstEntity> dumpScopedEntities(CAstEntity entity, int indent, StringBuilder buf) {
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ArrayList<CAstEntity> scopedEntities = new ArrayList<>();
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Map<CAstEntity, CAstNode> m = HashMapFactory.make();
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for(Entry<CAstNode, Collection<CAstEntity>> e : entity.getAllScopedEntities().entrySet())
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for(CAstEntity scopedEntity : e.getValue()) {
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scopedEntities.add(scopedEntity);
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m.put(scopedEntity, e.getKey());
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}
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Collections.sort(scopedEntities, (o1, o2) -> o1.getName().compareTo(o2.getName()));
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buf.append(indent(indent) + "> ");
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boolean first = true;
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for(CAstEntity scopedEntity : scopedEntities) {
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if(first)
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first = false;
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else
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buf.append(", ");
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buf.append(scopedEntity.getName() + "@" + labeller.addNode(m.get(scopedEntity)));
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}
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buf.append("\n");
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return scopedEntities;
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}
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private boolean isTrivial(CAstNode node) {
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switch(node.getKind()) {
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case ASSIGN:
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return node.getChild(0).getKind() == CAstNode.VAR && isTrivial(node.getChild(1));
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case EMPTY:
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return true;
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case BLOCK_EXPR:
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case BLOCK_STMT:
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return getNonTrivialChildCount(node) == 0;
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default:
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return false;
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}
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}
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private int getNonTrivialChildCount(CAstNode node) {
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int cnt = 0;
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for(int i=0;i<node.getChildCount();++i)
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if(!isTrivial(node.getChild(i)))
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++cnt;
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return cnt;
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}
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@SuppressWarnings("unused")
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private void dump(CAstNode node, int indent, StringBuilder buf, CAstControlFlowMap cfg) {
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if(isTrivial(node))
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return;
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// normalise away single-child block expressions
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if(NORMALISE && node.getKind() == CAstNode.BLOCK_EXPR && getNonTrivialChildCount(node) == 1) {
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for(int i=0;i<node.getChildCount();++i)
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if(!isTrivial(node.getChild(i)))
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dump(node.getChild(i), indent, buf, cfg);
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} else {
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buf.append(indent(indent) + labeller.addNode(node) + ": ");
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if(node.getKind() == CAstNode.CONSTANT) {
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if(node.getValue() == null)
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buf.append("null");
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else if(node.getValue() instanceof Integer)
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buf.append(node.getValue()+"");
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else
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buf.append("\"" + node.getValue() + "\"");
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} else if(node.getKind() == CAstNode.OPERATOR) {
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buf.append(node.getValue().toString());
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} else {
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buf.append(CAstPrinter.kindAsString(node.getKind()));
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}
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Collection<Object> labels = cfg.getTargetLabels(node);
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if(!labels.isEmpty()) {
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buf.append(" [");
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boolean first = true;
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for(Object label : labels) {
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CAstNode target = cfg.getTarget(node, label);
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if(first) {
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first = false;
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} else {
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buf.append(", ");
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}
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if(label instanceof CAstNode)
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buf.append("CAstNode@" + labeller.addNode((CAstNode)label) + ": ");
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else
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buf.append(label + ": ");
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buf.append(labeller.addNode(target));
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}
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buf.append("]");
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}
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buf.append("\n");
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for(int i=0;i<node.getChildCount();++i) {
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CAstNode child = node.getChild(i);
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// omit empty statements in a block
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if(NORMALISE && node.getKind() == CAstNode.BLOCK_STMT && child != null && child.getKind() == CAstNode.EMPTY)
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continue;
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dump(child, indent+2, buf, cfg);
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}
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}
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}
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}
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