397 lines
16 KiB
Java
397 lines
16 KiB
Java
/******************************************************************************
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* Copyright (c) 2002 - 2006 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.io.UTFDataFormatException;
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import com.ibm.wala.cast.ir.translator.AstTranslator;
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import com.ibm.wala.cast.js.loader.JSCallSiteReference;
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import com.ibm.wala.cast.js.loader.JavaScriptLoader;
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import com.ibm.wala.cast.js.ssa.JSInstructionFactory;
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import com.ibm.wala.cast.js.ssa.JavaScriptInstanceOf;
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import com.ibm.wala.cast.js.types.JavaScriptMethods;
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import com.ibm.wala.cast.js.types.JavaScriptTypes;
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import com.ibm.wala.cast.loader.AstMethod.DebuggingInformation;
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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.tree.CAstSymbol;
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import com.ibm.wala.cast.tree.CAstType;
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import com.ibm.wala.cast.tree.impl.CAstSymbolImpl;
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import com.ibm.wala.cast.tree.visit.CAstVisitor;
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import com.ibm.wala.cast.types.AstMethodReference;
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import com.ibm.wala.cfg.AbstractCFG;
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import com.ibm.wala.classLoader.NewSiteReference;
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import com.ibm.wala.ssa.SSAPutInstruction;
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import com.ibm.wala.ssa.SymbolTable;
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import com.ibm.wala.types.FieldReference;
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import com.ibm.wala.types.MethodReference;
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import com.ibm.wala.types.TypeName;
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import com.ibm.wala.types.TypeReference;
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import com.ibm.wala.util.debug.Assertions;
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import com.ibm.wala.util.strings.Atom;
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/**
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* Specialization of {@link AstTranslator} for JavaScript.
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*
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*/
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public class JSAstTranslator extends AstTranslator {
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private final static boolean DEBUG = false;
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public JSAstTranslator(JavaScriptLoader loader) {
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super(loader);
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}
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protected boolean useDefaultInitValues() {
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return false;
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}
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protected boolean hasImplicitGlobals() {
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return true;
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}
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protected boolean treatGlobalsAsLexicallyScoped() {
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return false;
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}
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protected boolean useLocalValuesForLexicalVars() {
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return true;
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}
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protected TypeReference defaultCatchType() {
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return JavaScriptTypes.Root;
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}
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protected TypeReference makeType(CAstType type) {
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Assertions.UNREACHABLE("JavaScript does not use CAstType");
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return null;
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}
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/**
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* generate an instruction that checks if readVn is undefined and throws an exception if it isn't
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*/
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private void addDefinedCheck(CAstNode n, WalkContext context, int readVn) {
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context.cfg().addPreNode(n);
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context.cfg().addInstruction(((JSInstructionFactory) insts).CheckReference(readVn));
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CAstNode target = context.getControlFlow().getTarget(n, JavaScriptTypes.ReferenceError);
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if (target != null) {
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context.cfg().addPreEdge(n, target, true);
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} else {
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context.cfg().addPreEdgeToExit(n, true);
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}
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context.cfg().newBlock(true);
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}
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protected int doLexicallyScopedRead(CAstNode n, WalkContext context, String name) {
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int readVn = super.doLexicallyScopedRead(n, context, name);
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// should get an exception if name is undefined
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addDefinedCheck(n, context, readVn);
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return readVn;
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}
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protected int doGlobalRead(CAstNode n, WalkContext context, String name) {
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int readVn = super.doGlobalRead(n, context, name);
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// add a check if name is undefined, unless we're reading the value 'undefined'
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if (!("undefined".equals(name) || "$$undefined".equals(name))) {
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addDefinedCheck(n, context, readVn);
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}
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return readVn;
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}
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protected boolean defineType(CAstEntity type, WalkContext wc) {
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Assertions.UNREACHABLE("JavaScript doesn't have types. I suggest you look elsewhere for your amusement.");
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return false;
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}
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protected void defineField(CAstEntity topEntity, WalkContext wc, CAstEntity n) {
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Assertions.UNREACHABLE("JavaScript doesn't have fields, numb-nuts!");
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}
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protected String composeEntityName(WalkContext parent, CAstEntity f) {
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if (f.getKind() == CAstEntity.SCRIPT_ENTITY)
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return f.getName();
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else
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return parent.getName() + "/" + f.getName();
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}
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protected void declareFunction(CAstEntity N, WalkContext context) {
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String fnName = composeEntityName(context, N);
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if (N.getKind() == CAstEntity.SCRIPT_ENTITY) {
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((JavaScriptLoader) loader).defineScriptType("L" + fnName, N.getPosition());
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} else if (N.getKind() == CAstEntity.FUNCTION_ENTITY) {
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((JavaScriptLoader) loader).defineFunctionType("L" + fnName, N.getPosition());
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} else {
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Assertions.UNREACHABLE();
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}
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}
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protected void defineFunction(CAstEntity N, WalkContext definingContext, AbstractCFG cfg, SymbolTable symtab,
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boolean hasCatchBlock, TypeReference[][] caughtTypes, boolean hasMonitorOp, AstLexicalInformation LI,
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DebuggingInformation debugInfo) {
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if (DEBUG)
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System.err.println(("\n\nAdding code for " + N));
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String fnName = composeEntityName(definingContext, N);
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if (DEBUG)
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System.err.println(cfg);
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// force creation of these constants by calling the getter methods
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symtab.getNullConstant();
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((JavaScriptLoader) loader).defineCodeBodyCode("L" + fnName, cfg, symtab, hasCatchBlock, caughtTypes, hasMonitorOp, LI,
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debugInfo);
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}
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protected void doThrow(WalkContext context, int exception) {
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context.cfg().addInstruction(insts.ThrowInstruction(exception));
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}
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protected void doCall(WalkContext context, CAstNode call, int result, int exception, CAstNode name, int receiver, int[] arguments) {
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MethodReference ref = name.getValue().equals("ctor") ? JavaScriptMethods.ctorReference : AstMethodReference
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.fnReference(JavaScriptTypes.CodeBody);
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).Invoke(receiver, result, arguments, exception, new JSCallSiteReference(ref, context.cfg()
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.getCurrentInstruction())));
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context.cfg().addPreNode(call, context.getUnwindState());
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// this new block is for the normal termination case
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context.cfg().newBlock(true);
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// exceptional case: flow to target given in CAst, or if null, the exit node
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if (context.getControlFlow().getTarget(call, null) != null)
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context.cfg().addPreEdge(call, context.getControlFlow().getTarget(call, null), true);
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else
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context.cfg().addPreEdgeToExit(call, true);
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}
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protected void doNewObject(WalkContext context, CAstNode newNode, int result, Object type, int[] arguments) {
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assert arguments == null;
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TypeReference typeRef = TypeReference.findOrCreate(JavaScriptTypes.jsLoader, TypeName.string2TypeName("L" + type));
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context.cfg().addInstruction(
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insts.NewInstruction(result, NewSiteReference.make(context.cfg().getCurrentInstruction(), typeRef)));
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}
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protected void doMaterializeFunction(CAstNode n, WalkContext context, int result, int exception, CAstEntity fn) {
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int nm = context.currentScope().getConstantValue("L" + composeEntityName(context, fn));
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// "Function" is the name we use to model the constructor of function values
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int tmp = super.doGlobalRead(n, context, "Function");
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).Invoke(tmp, result, new int[] { nm }, exception, new JSCallSiteReference(
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JavaScriptMethods.ctorReference, context.cfg().getCurrentInstruction())));
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}
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public void doArrayRead(WalkContext context, int result, int arrayValue, CAstNode arrayRef, int[] dimValues) {
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Assertions.UNREACHABLE("JSAstTranslator.doArrayRead() called!");
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}
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public void doArrayWrite(WalkContext context, int arrayValue, CAstNode arrayRef, int[] dimValues, int rval) {
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Assertions.UNREACHABLE("JSAstTranslator.doArrayWrite() called!");
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}
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protected void doFieldRead(WalkContext context, int result, int receiver, CAstNode elt, CAstNode readNode) {
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this.visit(elt, context, this);
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int x = context.currentScope().allocateTempValue();
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context.cfg().addInstruction(((JSInstructionFactory) insts).AssignInstruction(x, receiver));
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if (elt.getKind() == CAstNode.CONSTANT && elt.getValue() instanceof String) {
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String field = (String) elt.getValue();
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// symtab needs to have this value
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context.currentScope().getConstantValue(field);
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context.cfg().addInstruction(((JSInstructionFactory) insts).GetInstruction(result, x, field));
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} else {
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context.cfg().addInstruction(((JSInstructionFactory) insts).PropertyRead(result, x, getValue(elt)));
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}
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// generate code to handle read of non-existent property
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if (context.getControlFlow().getMappedNodes().contains(readNode)) {
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context.cfg().addPreNode(readNode, context.getUnwindState());
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context.cfg().newBlock(true);
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if (context.getControlFlow().getTarget(readNode, JavaScriptTypes.TypeError) != null)
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context.cfg().addPreEdge(readNode, context.getControlFlow().getTarget(readNode, JavaScriptTypes.TypeError), true);
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else
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context.cfg().addPreEdgeToExit(readNode, true);
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}
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}
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protected void doFieldWrite(WalkContext context, int receiver, CAstNode elt, CAstNode parent, int rval) {
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this.visit(elt, context, this);
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if (elt.getKind() == CAstNode.CONSTANT && elt.getValue() instanceof String) {
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String field = (String) elt.getValue();
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context.currentScope().getConstantValue(field);
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SSAPutInstruction put = ((JSInstructionFactory) insts).PutInstruction(receiver, rval, field);
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try {
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assert field.equals(put.getDeclaredField().getName().toUnicodeString());
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} catch (UTFDataFormatException e) {
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Assertions.UNREACHABLE();
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}
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context.cfg().addInstruction(put);
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} else {
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context.cfg().addInstruction(((JSInstructionFactory) insts).PropertyWrite(receiver, getValue(elt), rval));
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}
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}
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private void doPrimitiveNew(WalkContext context, int resultVal, String typeName) {
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doNewObject(context, null, resultVal, typeName + "Object", null);
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// set the class property of the new object
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int rval = context.currentScope().getConstantValue(typeName);
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context.currentScope().getConstantValue("class");
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context.cfg().addInstruction(((JSInstructionFactory) insts).PutInstruction(resultVal, rval, "class"));
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}
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protected void doPrimitive(int resultVal, WalkContext context, CAstNode primitiveCall) {
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try {
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String name = (String) primitiveCall.getChild(0).getValue();
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if (name.equals("GlobalNaN")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal,
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context.currentScope().getConstantValue(new Float(Float.NaN))));
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} else if (name.equals("GlobalInfinity")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal,
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context.currentScope().getConstantValue(new Float(Float.POSITIVE_INFINITY))));
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} else if (name.equals("MathE")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts)
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.AssignInstruction(resultVal, context.currentScope().getConstantValue(new Double(Math.E))));
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} else if (name.equals("MathPI")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal, context.currentScope()
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.getConstantValue(new Double(Math.PI))));
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} else if (name.equals("MathSQRT1_2")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal,
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context.currentScope().getConstantValue(new Double(Math.sqrt(.5)))));
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} else if (name.equals("MathSQRT2")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal,
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context.currentScope().getConstantValue(new Double(Math.sqrt(2)))));
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} else if (name.equals("MathLN2")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal,
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context.currentScope().getConstantValue(new Double(Math.log(2)))));
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} else if (name.equals("MathLN10")) {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal,
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context.currentScope().getConstantValue(new Double(Math.log(10)))));
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} else if (name.equals("NewObject")) {
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doNewObject(context, null, resultVal, "Object", null);
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} else if (name.equals("NewArray")) {
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doNewObject(context, null, resultVal, "Array", null);
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} else if (name.equals("NewString")) {
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doPrimitiveNew(context, resultVal, "String");
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} else if (name.equals("NewNumber")) {
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doPrimitiveNew(context, resultVal, "Number");
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} else if (name.equals("NewRegExp")) {
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doPrimitiveNew(context, resultVal, "RegExp");
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} else if (name.equals("NewFunction")) {
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doNewObject(context, null, resultVal, "Function", null);
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} else if (name.equals("NewUndefined")) {
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doNewObject(context, null, resultVal, "Undefined", null);
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} else {
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context.cfg().addInstruction(
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((JSInstructionFactory) insts).AssignInstruction(resultVal, context.currentScope().getConstantValue(null)));
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}
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} catch (ClassCastException e) {
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throw new RuntimeException("Cannot translate primitive " + primitiveCall.getChild(0).getValue());
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}
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}
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protected void doIsFieldDefined(WalkContext context, int result, int ref, CAstNode f) {
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if (f.getKind() == CAstNode.CONSTANT && f.getValue() instanceof String) {
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String field = (String) f.getValue();
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FieldReference fieldRef = FieldReference.findOrCreate(JavaScriptTypes.Root, Atom.findOrCreateUnicodeAtom((String) field),
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JavaScriptTypes.Root);
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context.cfg().addInstruction(((JSInstructionFactory) insts).IsDefinedInstruction(result, ref, fieldRef));
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} else {
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context.cfg().addInstruction(((JSInstructionFactory) insts).IsDefinedInstruction(result, ref, getValue(f)));
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}
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}
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protected boolean visitInstanceOf(CAstNode n, Context c, CAstVisitor visitor) {
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WalkContext context = (WalkContext) c;
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int result = context.currentScope().allocateTempValue();
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setValue(n, result);
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return false;
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}
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protected void leaveInstanceOf(CAstNode n, Context c, CAstVisitor visitor) {
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WalkContext context = (WalkContext) c;
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int result = getValue(n);
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visit(n.getChild(0), context, visitor);
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int value = getValue(n.getChild(0));
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visit(n.getChild(1), context, visitor);
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int type = getValue(n.getChild(1));
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context.cfg().addInstruction(new JavaScriptInstanceOf(result, value, type));
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}
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protected void doPrologue(WalkContext context) {
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super.doPrologue(context);
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int tempVal = context.currentScope().allocateTempValue();
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doNewObject(context, null, tempVal, "Array", null);
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CAstSymbol args = new CAstSymbolImpl("arguments");
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context.currentScope().declare(args, tempVal);
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context.cfg().addInstruction(((JSInstructionFactory) insts).PutInstruction(1, tempVal, "arguments"));
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}
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protected boolean doVisit(CAstNode n, Context cntxt, CAstVisitor visitor) {
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WalkContext context = (WalkContext) cntxt;
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switch (n.getKind()) {
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case CAstNode.TYPE_OF: {
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int result = context.currentScope().allocateTempValue();
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this.visit(n.getChild(0), context, this);
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int ref = getValue(n.getChild(0));
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context.cfg().addInstruction(((JSInstructionFactory) insts).TypeOfInstruction(result, ref));
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setValue(n, result);
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return true;
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}
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case JavaScriptCAstNode.ENTER_WITH:
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case JavaScriptCAstNode.EXIT_WITH: {
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this.visit(n.getChild(0), context, this);
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int ref = getValue(n.getChild(0));
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context.cfg().addInstruction(((JSInstructionFactory) insts).WithRegion(ref, n.getKind() == JavaScriptCAstNode.ENTER_WITH));
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return true;
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}
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default: {
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return false;
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}
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}
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}
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}
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