70 lines
2.4 KiB
Java
70 lines
2.4 KiB
Java
/******************************************************************************
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* Copyright (c) 2002 - 2012 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.callgraph.fieldbased;
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import com.ibm.wala.cast.ir.ssa.AstGlobalRead;
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import com.ibm.wala.cast.js.ssa.JSAbstractInstructionVisitor;
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import com.ibm.wala.cast.js.ssa.JavaScriptInvoke;
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import com.ibm.wala.cast.js.types.JavaScriptMethods;
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import com.ibm.wala.classLoader.IMethod;
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import com.ibm.wala.ssa.DefUse;
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import com.ibm.wala.ssa.SSAInstruction;
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import com.ibm.wala.ssa.SymbolTable;
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/**
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* A {@link JSAbstractInstructionVisitor} that is used to only visit instructions of a single method.
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*
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* @author mschaefer
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*
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*/
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public class JSMethodInstructionVisitor extends JSAbstractInstructionVisitor {
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protected final IMethod method;
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protected final SymbolTable symtab;
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protected final DefUse du;
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public JSMethodInstructionVisitor(IMethod method, SymbolTable symtab, DefUse du) {
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this.method = method;
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this.symtab = symtab;
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this.du = du;
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}
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/**
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* Determine whether <code>invk</code> corresponds to a function declaration or function expression.
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*
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* TODO: A bit hackish. Is there a more principled way to do this?
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*/
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protected boolean isFunctionConstructorInvoke(JavaScriptInvoke invk) {
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/*
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* Function objects are allocated by explicit constructor invocations like this:
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*
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* v8 = global:global Function
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* v4 = construct v8@2 v6:#L<fullFunctionName> exception:<nd>
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*/
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if(invk.getDeclaredTarget().equals(JavaScriptMethods.ctorReference)) {
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int fn = invk.getFunction();
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SSAInstruction fndef = du.getDef(fn);
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if(fndef instanceof AstGlobalRead) {
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AstGlobalRead agr = (AstGlobalRead)fndef;
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if(agr.getGlobalName().equals("global Function")) {
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if(invk.getNumberOfPositionalParameters() != 2)
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return false;
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// this may be a genuine use of "new Function()", not a declaration/expression
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if(!symtab.isStringConstant(invk.getUse(1)))
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return false;
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return true;
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}
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}
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}
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return false;
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}
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}
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