231 lines
6.1 KiB
Java
231 lines
6.1 KiB
Java
/*******************************************************************************
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* Copyright (c) 2013 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.translator;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.Vector;
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import com.ibm.wala.cast.ir.translator.TranslatorToCAst;
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import com.ibm.wala.cast.tree.CAstControlFlowMap;
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import com.ibm.wala.cast.tree.CAstNode;
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import com.ibm.wala.util.debug.Assertions;
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public interface JavaScriptTranslatorToCAst extends TranslatorToCAst {
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interface WalkContext<C extends WalkContext<C, T>, T> extends TranslatorToCAst.WalkContext<C, T> {
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@Override
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WalkContext<C, T> getParent();
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default String script() {
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return getParent().script();
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}
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/**
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* Add a name declaration to this context. For variables or constants, n
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* should be a {@link CAstNode#DECL_STMT}, and the initialization of the
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* variable (if any) may occur in a separate assignment. For functions, n
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* should be a {@link CAstNode#FUNCTION_STMT}, including the function body.
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*/
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default void addNameDecl(CAstNode n) {
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getParent().addNameDecl(n);
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}
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default Collection<CAstNode> getNameDecls() {
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return getParent().getNameDecls();
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}
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default int setOperation(T node) {
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return getParent().setOperation(node);
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}
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default boolean foundMemberOperation(T node) {
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return getParent().foundMemberOperation(node);
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}
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default void copyOperation(T from, T to) {
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getParent().copyOperation(from, to);
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}
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}
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public static class RootContext<C extends WalkContext<C, T>, T> extends TranslatorToCAst.RootContext<C, T> implements WalkContext<C,T> {
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@Override
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public WalkContext<C, T> getParent() {
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assert false;
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return null;
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}
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@Override
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public String script() { return null; }
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@Override
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public T top() {
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Assertions.UNREACHABLE();
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return null;
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}
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@Override
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public void addNameDecl(CAstNode v) {
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Assertions.UNREACHABLE();
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}
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@Override
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public Collection<CAstNode> getNameDecls() {
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Assertions.UNREACHABLE();
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return null;
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}
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@Override
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public CAstNode getCatchTarget() {
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Assertions.UNREACHABLE();
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return null;
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}
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@Override
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public int setOperation(T node) {
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return -1;
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}
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@Override
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public boolean foundMemberOperation(T node) {
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return false;
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}
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@Override
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public void copyOperation(T from, T to) {
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Assertions.UNREACHABLE();
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}
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}
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public static class FunctionContext<C extends WalkContext<C, T>, T> extends TranslatorToCAst.FunctionContext<C, T> implements WalkContext<C,T> {
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private final Vector<CAstNode> initializers = new Vector<>();
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@Override
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public WalkContext<C, T> getParent() {
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return (WalkContext<C, T>) super.getParent();
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}
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protected FunctionContext(C parent, T s) {
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super(parent, s);
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}
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@Override
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public void addNameDecl(CAstNode v) { initializers.add(v); }
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@Override
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public Collection<CAstNode> getNameDecls() { return initializers; }
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@Override
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public String script() {
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return parent.script();
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}
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@Override
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public CAstNode getCatchTarget() {
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return CAstControlFlowMap.EXCEPTION_TO_EXIT;
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}
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@Override
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public int setOperation(T node) {
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return parent.setOperation(node);
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}
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@Override
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public boolean foundMemberOperation(T node) {
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return parent.foundMemberOperation(node);
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}
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@Override
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public void copyOperation(T from, T to) {
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parent.copyOperation(from, to);
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}
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}
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public static class ScriptContext<C extends WalkContext<C, T>, T> extends FunctionContext<C,T> {
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private final String script;
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ScriptContext(C parent, T s, String script) {
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super(parent, s);
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this.script = script;
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}
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@Override
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public String script() { return script; }
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}
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/**
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* Used to determine the value to be passed as the 'this' argument for a
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* function call. This is needed since in JavaScript, you can write a call
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* e(...) where e is some arbitrary expression, and in the case where e is a
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* property access like e'.f, we must discover that the value of expression e'
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* is passed as the 'this' parameter.
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*
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* The general strategy is to store the value of the expression passed as the
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* 'this' parameter in baseVar, and then to use baseVar as the actual argument
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* sub-node for the CAst call node
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*/
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public class MemberDestructuringContext<C extends WalkContext<C, T>, T> implements WalkContext<C,T> {
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private final WalkContext<C, T> parent;
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/**
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* node for which we actually care about what the base pointer is. this
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* helps to handle cases like x.y.f(), where we would like to store x.y in
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* baseVar, but not x when we recurse.
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*/
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private final Set<T> baseFor = new HashSet<>();
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private int operationIndex;
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/**
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* have we discovered a value to be passed as the 'this' parameter?
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*/
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private boolean foundBase = false;
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protected MemberDestructuringContext(C parent, T initialBaseFor, int operationIndex) {
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this.parent = parent;
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baseFor.add( initialBaseFor );
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this.operationIndex = operationIndex;
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}
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@Override
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public int setOperation(T node) {
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if (baseFor.contains( node )) {
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foundBase = true;
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return operationIndex;
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} else {
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return -1;
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}
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}
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@Override
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public boolean foundMemberOperation(T node) {
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return foundBase;
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}
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@Override
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public void copyOperation(T from, T to) {
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if (baseFor.contains(from)) baseFor.add(to);
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}
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@Override
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public WalkContext<C, T> getParent() {
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return parent;
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}
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}
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}
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