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org.mozilla.javascript.IRFactory Maven / Gradle / Ivy
Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically
embedded into Java applications to provide scripting to end users.
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.List;
import org.mozilla.javascript.ast.ArrayComprehension;
import org.mozilla.javascript.ast.ArrayComprehensionLoop;
import org.mozilla.javascript.ast.ArrayLiteral;
import org.mozilla.javascript.ast.Assignment;
import org.mozilla.javascript.ast.AstNode;
import org.mozilla.javascript.ast.AstRoot;
import org.mozilla.javascript.ast.BigIntLiteral;
import org.mozilla.javascript.ast.Block;
import org.mozilla.javascript.ast.BreakStatement;
import org.mozilla.javascript.ast.CatchClause;
import org.mozilla.javascript.ast.ComputedPropertyKey;
import org.mozilla.javascript.ast.ConditionalExpression;
import org.mozilla.javascript.ast.ContinueStatement;
import org.mozilla.javascript.ast.DestructuringForm;
import org.mozilla.javascript.ast.DoLoop;
import org.mozilla.javascript.ast.ElementGet;
import org.mozilla.javascript.ast.EmptyExpression;
import org.mozilla.javascript.ast.ExpressionStatement;
import org.mozilla.javascript.ast.ForInLoop;
import org.mozilla.javascript.ast.ForLoop;
import org.mozilla.javascript.ast.FunctionCall;
import org.mozilla.javascript.ast.FunctionNode;
import org.mozilla.javascript.ast.GeneratorExpression;
import org.mozilla.javascript.ast.GeneratorExpressionLoop;
import org.mozilla.javascript.ast.GeneratorMethodDefinition;
import org.mozilla.javascript.ast.IfStatement;
import org.mozilla.javascript.ast.InfixExpression;
import org.mozilla.javascript.ast.Jump;
import org.mozilla.javascript.ast.KeywordLiteral;
import org.mozilla.javascript.ast.Label;
import org.mozilla.javascript.ast.LabeledStatement;
import org.mozilla.javascript.ast.LetNode;
import org.mozilla.javascript.ast.Name;
import org.mozilla.javascript.ast.NewExpression;
import org.mozilla.javascript.ast.NumberLiteral;
import org.mozilla.javascript.ast.ObjectLiteral;
import org.mozilla.javascript.ast.ObjectProperty;
import org.mozilla.javascript.ast.ParenthesizedExpression;
import org.mozilla.javascript.ast.PropertyGet;
import org.mozilla.javascript.ast.RegExpLiteral;
import org.mozilla.javascript.ast.ReturnStatement;
import org.mozilla.javascript.ast.Scope;
import org.mozilla.javascript.ast.ScriptNode;
import org.mozilla.javascript.ast.StringLiteral;
import org.mozilla.javascript.ast.SwitchCase;
import org.mozilla.javascript.ast.SwitchStatement;
import org.mozilla.javascript.ast.Symbol;
import org.mozilla.javascript.ast.TaggedTemplateLiteral;
import org.mozilla.javascript.ast.TemplateCharacters;
import org.mozilla.javascript.ast.TemplateLiteral;
import org.mozilla.javascript.ast.ThrowStatement;
import org.mozilla.javascript.ast.TryStatement;
import org.mozilla.javascript.ast.UnaryExpression;
import org.mozilla.javascript.ast.UpdateExpression;
import org.mozilla.javascript.ast.VariableDeclaration;
import org.mozilla.javascript.ast.VariableInitializer;
import org.mozilla.javascript.ast.WhileLoop;
import org.mozilla.javascript.ast.WithStatement;
import org.mozilla.javascript.ast.XmlElemRef;
import org.mozilla.javascript.ast.XmlExpression;
import org.mozilla.javascript.ast.XmlFragment;
import org.mozilla.javascript.ast.XmlLiteral;
import org.mozilla.javascript.ast.XmlMemberGet;
import org.mozilla.javascript.ast.XmlPropRef;
import org.mozilla.javascript.ast.XmlRef;
import org.mozilla.javascript.ast.XmlString;
import org.mozilla.javascript.ast.Yield;
/**
* This class rewrites the parse tree into an IR suitable for codegen.
*
* @see Node
* @author Mike McCabe
* @author Norris Boyd
*/
public final class IRFactory {
private static final int LOOP_DO_WHILE = 0;
private static final int LOOP_WHILE = 1;
private static final int LOOP_FOR = 2;
private static final int ALWAYS_TRUE_BOOLEAN = 1;
private static final int ALWAYS_FALSE_BOOLEAN = -1;
private Parser parser;
private AstNodePosition astNodePos;
public IRFactory(CompilerEnvirons env, String sourceString) {
this(env, null, sourceString, env.getErrorReporter());
}
/** Use {@link #IRFactory(CompilerEnvirons, String, String, ErrorReporter)} */
@Deprecated
public IRFactory(CompilerEnvirons env, String sourceString, ErrorReporter errorReporter) {
this(env, null, sourceString, errorReporter);
}
public IRFactory(
CompilerEnvirons env,
String sourceName,
String sourceString,
ErrorReporter errorReporter) {
parser = new Parser(env, errorReporter);
astNodePos = new AstNodePosition(sourceString);
parser.currentPos = astNodePos;
parser.setSourceURI(sourceName);
}
/** Transforms the tree into a lower-level IR suitable for codegen. */
public ScriptNode transformTree(AstRoot root) {
parser.currentScriptOrFn = root;
parser.inUseStrictDirective = root.isInStrictMode();
if (Token.printTrees) {
System.out.println("IRFactory.transformTree");
System.out.println(root.debugPrint());
}
astNodePos.push(root);
try {
return (ScriptNode) transform(root);
} catch (Parser.ParserException e) {
parser.reportErrorsIfExists(root.getLineno());
return null;
} finally {
astNodePos.pop();
}
}
// Might want to convert this to polymorphism - move transform*
// functions into the AstNode subclasses. OTOH that would make
// IR transformation part of the public AST API - desirable?
// Another possibility: create AstTransformer interface and adapter.
private Node transform(AstNode node) {
switch (node.getType()) {
case Token.ARRAYCOMP:
return transformArrayComp((ArrayComprehension) node);
case Token.ARRAYLIT:
return transformArrayLiteral((ArrayLiteral) node);
case Token.BIGINT:
return transformBigInt((BigIntLiteral) node);
case Token.BLOCK:
return transformBlock(node);
case Token.BREAK:
return transformBreak((BreakStatement) node);
case Token.CALL:
return transformFunctionCall((FunctionCall) node);
case Token.CONTINUE:
return transformContinue((ContinueStatement) node);
case Token.DO:
return transformDoLoop((DoLoop) node);
case Token.EMPTY:
case Token.COMMENT:
return node;
case Token.FOR:
if (node instanceof ForInLoop) {
return transformForInLoop((ForInLoop) node);
}
return transformForLoop((ForLoop) node);
case Token.FUNCTION:
return transformFunction((FunctionNode) node);
case Token.GENEXPR:
return transformGenExpr((GeneratorExpression) node);
case Token.GETELEM:
return transformElementGet((ElementGet) node);
case Token.GETPROP:
return transformPropertyGet((PropertyGet) node);
case Token.QUESTION_DOT:
if (node instanceof ElementGet) {
return transformElementGet((ElementGet) node);
} else {
return transformPropertyGet((PropertyGet) node);
}
case Token.HOOK:
return transformCondExpr((ConditionalExpression) node);
case Token.IF:
return transformIf((IfStatement) node);
case Token.TRUE:
case Token.FALSE:
case Token.THIS:
case Token.NULL:
case Token.DEBUGGER:
return transformLiteral(node);
case Token.SUPER:
parser.setRequiresActivation();
return transformLiteral(node);
case Token.NAME:
return transformName((Name) node);
case Token.NUMBER:
return transformNumber((NumberLiteral) node);
case Token.NEW:
return transformNewExpr((NewExpression) node);
case Token.OBJECTLIT:
return transformObjectLiteral((ObjectLiteral) node);
case Token.TEMPLATE_LITERAL:
return transformTemplateLiteral((TemplateLiteral) node);
case Token.TAGGED_TEMPLATE_LITERAL:
return transformTemplateLiteralCall((TaggedTemplateLiteral) node);
case Token.REGEXP:
return transformRegExp((RegExpLiteral) node);
case Token.RETURN:
return transformReturn((ReturnStatement) node);
case Token.SCRIPT:
return transformScript((ScriptNode) node);
case Token.STRING:
return transformString((StringLiteral) node);
case Token.SWITCH:
return transformSwitch((SwitchStatement) node);
case Token.THROW:
return transformThrow((ThrowStatement) node);
case Token.TRY:
return transformTry((TryStatement) node);
case Token.WHILE:
return transformWhileLoop((WhileLoop) node);
case Token.WITH:
return transformWith((WithStatement) node);
case Token.YIELD:
case Token.YIELD_STAR:
return transformYield((Yield) node);
default:
if (node instanceof ExpressionStatement) {
return transformExprStmt((ExpressionStatement) node);
}
if (node instanceof Assignment) {
return transformAssignment((Assignment) node);
}
if (node instanceof UnaryExpression) {
return transformUnary((UnaryExpression) node);
}
if (node instanceof UpdateExpression) {
return transformUpdate((UpdateExpression) node);
}
if (node instanceof XmlMemberGet) {
return transformXmlMemberGet((XmlMemberGet) node);
}
if (node instanceof InfixExpression) {
return transformInfix((InfixExpression) node);
}
if (node instanceof VariableDeclaration) {
return transformVariables((VariableDeclaration) node);
}
if (node instanceof ParenthesizedExpression) {
return transformParenExpr((ParenthesizedExpression) node);
}
if (node instanceof ComputedPropertyKey) {
return transformComputedPropertyKey((ComputedPropertyKey) node);
}
if (node instanceof LabeledStatement) {
return transformLabeledStatement((LabeledStatement) node);
}
if (node instanceof LetNode) {
return transformLetNode((LetNode) node);
}
if (node instanceof XmlRef) {
return transformXmlRef((XmlRef) node);
}
if (node instanceof XmlLiteral) {
return transformXmlLiteral((XmlLiteral) node);
}
if (node instanceof GeneratorMethodDefinition) {
return transformGeneratorMethodDefinition((GeneratorMethodDefinition) node);
}
throw new IllegalArgumentException("Can't transform: " + node);
}
}
private Node transformArrayComp(ArrayComprehension node) {
// An array comprehension expression such as
//
// [expr for (x in foo) for each ([y, z] in bar) if (cond)]
//
// is rewritten approximately as
//
// new Scope(ARRAYCOMP) {
// new Node(BLOCK) {
// let tmp1 = new Array;
// for (let x in foo) {
// for each (let tmp2 in bar) {
// if (cond) {
// tmp1.push([y, z] = tmp2, expr);
// }
// }
// }
// }
// createName(tmp1)
// }
int lineno = node.getLineno(), column = node.getColumn();
Scope scopeNode = parser.createScopeNode(Token.ARRAYCOMP, lineno, column);
String arrayName = parser.currentScriptOrFn.getNextTempName();
parser.pushScope(scopeNode);
try {
astNodePos.push(node);
try {
parser.defineSymbol(Token.LET, arrayName, false);
Node block = new Node(Token.BLOCK);
block.setLineColumnNumber(lineno, column);
Node newArray = createCallOrNew(Token.NEW, parser.createName("Array"));
Node init =
new Node(
Token.EXPR_VOID,
createAssignment(
Token.ASSIGN, parser.createName(arrayName), newArray),
lineno,
column);
block.addChildToBack(init);
block.addChildToBack(arrayCompTransformHelper(node, arrayName));
scopeNode.addChildToBack(block);
scopeNode.addChildToBack(parser.createName(arrayName));
return scopeNode;
} finally {
astNodePos.pop();
}
} finally {
parser.popScope();
}
}
private Node arrayCompTransformHelper(ArrayComprehension node, String arrayName) {
int lineno = node.getLineno(), column = node.getColumn();
Node expr = transform(node.getResult());
List loops = node.getLoops();
int numLoops = loops.size();
// Walk through loops, collecting and defining their iterator symbols.
Node[] iterators = new Node[numLoops];
Node[] iteratedObjs = new Node[numLoops];
for (int i = 0; i < numLoops; i++) {
ArrayComprehensionLoop acl = loops.get(i);
AstNode iter = acl.getIterator();
astNodePos.push(iter);
try {
String name = null;
if (iter.getType() == Token.NAME) {
name = iter.getString();
} else {
// destructuring assignment
name = parser.currentScriptOrFn.getNextTempName();
parser.defineSymbol(Token.LP, name, false);
expr =
createBinary(
Token.COMMA,
createAssignment(Token.ASSIGN, iter, parser.createName(name)),
expr);
}
Node init = parser.createName(name);
// Define as a let since we want the scope of the variable to
// be restricted to the array comprehension
parser.defineSymbol(Token.LET, name, false);
iterators[i] = init;
} finally {
astNodePos.pop();
}
iteratedObjs[i] = transform(acl.getIteratedObject());
}
// generate code for tmpArray.push(body)
Node call =
createCallOrNew(
Token.CALL,
createPropertyGet(
parser.createName(arrayName), null, "push", 0, node.type));
Node body = new Node(Token.EXPR_VOID, call);
body.setLineColumnNumber(lineno, column);
if (node.getFilter() != null) {
body = createIf(transform(node.getFilter()), body, null, lineno, column);
}
// Now walk loops in reverse to build up the body statement.
int pushed = 0;
try {
for (int i = numLoops - 1; i >= 0; i--) {
ArrayComprehensionLoop acl = loops.get(i);
Scope loop =
createLoopNode(
null, // no label
acl.getLineno(),
acl.getColumn());
parser.pushScope(loop);
pushed++;
body =
createForIn(
Token.LET,
loop,
iterators[i],
iteratedObjs[i],
body,
acl,
acl.isForEach(),
acl.isForOf());
}
} finally {
for (int i = 0; i < pushed; i++) {
parser.popScope();
}
}
// Now that we've accumulated any destructuring forms,
// add expr to the call node; it's pushed on each iteration.
call.addChildToBack(expr);
return body;
}
private Node transformArrayLiteral(ArrayLiteral node) {
if (node.isDestructuring()) {
return node;
}
List elems = node.getElements();
Node array = new Node(Token.ARRAYLIT);
List skipIndexes = null;
for (int i = 0; i < elems.size(); ++i) {
AstNode elem = elems.get(i);
if (elem.getType() != Token.EMPTY) {
array.addChildToBack(transform(elem));
} else {
if (skipIndexes == null) {
skipIndexes = new ArrayList<>();
}
skipIndexes.add(Integer.valueOf(i));
}
}
array.putIntProp(Node.DESTRUCTURING_ARRAY_LENGTH, node.getDestructuringLength());
if (skipIndexes != null) {
int[] skips = new int[skipIndexes.size()];
for (int i = 0; i < skipIndexes.size(); i++) skips[i] = skipIndexes.get(i).intValue();
array.putProp(Node.SKIP_INDEXES_PROP, skips);
}
return array;
}
private Node transformAssignment(Assignment node) {
AstNode right = node.getRight();
AstNode left = parser.removeParens(node.getLeft());
left = transformAssignmentLeft(node, left, right);
Node target = null;
if (isDestructuring(left)) {
target = left;
} else {
target = transform(left);
}
astNodePos.push(left);
try {
return createAssignment(node.getType(), target, transform(right));
} finally {
astNodePos.pop();
}
}
private AstNode transformAssignmentLeft(Assignment node, AstNode left, AstNode right) {
if (right.getType() == Token.NULL
&& node.getType() == Token.ASSIGN
&& left instanceof Name
&& right instanceof KeywordLiteral) {
String identifier = ((Name) left).getIdentifier();
for (AstNode p = node.getParent(); p != null; p = p.getParent()) {
if (p instanceof FunctionNode) {
Name functionName = ((FunctionNode) p).getFunctionName();
if (functionName != null && functionName.getIdentifier().equals(identifier)) {
PropertyGet propertyGet = new PropertyGet();
KeywordLiteral thisKeyword = new KeywordLiteral();
thisKeyword.setType(Token.THIS);
propertyGet.setLeft(thisKeyword);
propertyGet.setRight(left);
node.setLeft(propertyGet);
return propertyGet;
}
}
}
}
return left;
}
private Node transformBigInt(BigIntLiteral node) {
return node;
}
private Node transformBlock(AstNode node) {
if (node instanceof Scope) {
parser.pushScope((Scope) node);
}
try {
List kids = new ArrayList<>();
for (Node kid : node) {
kids.add(transform((AstNode) kid));
}
node.removeChildren();
for (Node kid : kids) {
node.addChildToBack(kid);
}
return node;
} finally {
if (node instanceof Scope) {
parser.popScope();
}
}
}
private Node transformBreak(BreakStatement node) {
return node;
}
private Node transformCondExpr(ConditionalExpression node) {
Node test = transform(node.getTestExpression());
Node ifTrue = transform(node.getTrueExpression());
Node ifFalse = transform(node.getFalseExpression());
return createCondExpr(test, ifTrue, ifFalse);
}
private Node transformContinue(ContinueStatement node) {
return node;
}
private Node transformDoLoop(DoLoop loop) {
loop.setType(Token.LOOP);
parser.pushScope(loop);
try {
Node body = transform(loop.getBody());
Node cond = transform(loop.getCondition());
return createLoop(loop, LOOP_DO_WHILE, body, cond, null, null);
} finally {
parser.popScope();
}
}
private Node transformElementGet(ElementGet node) {
// OPT: could optimize to createPropertyGet
// iff elem is string that can not be number
Node target = transform(node.getTarget());
Node element = transform(node.getElement());
Node getElem = new Node(Token.GETELEM, target, element);
if (node.type == Token.QUESTION_DOT) {
getElem.putIntProp(Node.OPTIONAL_CHAINING, 1);
}
if (target.getType() == Token.SUPER) {
getElem.putIntProp(Node.SUPER_PROPERTY_ACCESS, 1);
}
return getElem;
}
private Node transformExprStmt(ExpressionStatement node) {
Node expr = transform(node.getExpression());
return new Node(node.getType(), expr, node.getLineno(), node.getColumn());
}
private Node transformForInLoop(ForInLoop loop) {
loop.setType(Token.LOOP);
parser.pushScope(loop);
try {
int declType = -1;
AstNode iter = loop.getIterator();
if (iter instanceof VariableDeclaration) {
declType = iter.getType();
}
Node lhs = transform(iter);
Node obj = transform(loop.getIteratedObject());
Node body = transform(loop.getBody());
return createForIn(
declType, loop, lhs, obj, body, loop, loop.isForEach(), loop.isForOf());
} finally {
parser.popScope();
}
}
private Node transformForLoop(ForLoop loop) {
loop.setType(Token.LOOP);
// XXX: Can't use pushScope/popScope here since 'createFor' may split
// the scope
Scope savedScope = parser.currentScope;
parser.currentScope = loop;
try {
Node init = transform(loop.getInitializer());
Node test = transform(loop.getCondition());
Node incr = transform(loop.getIncrement());
Node body = transform(loop.getBody());
return createFor(loop, init, test, incr, body);
} finally {
parser.currentScope = savedScope;
}
}
private Node transformFunction(FunctionNode fn) {
Node mexpr = decompileFunctionHeader(fn);
int index = parser.currentScriptOrFn.addFunction(fn);
Parser.PerFunctionVariables savedVars = parser.createPerFunctionVariables(fn);
try {
// If we start needing to record much more codegen metadata during
// function parsing, we should lump it all into a helper class.
Node destructuring = (Node) fn.getProp(Node.DESTRUCTURING_PARAMS);
fn.removeProp(Node.DESTRUCTURING_PARAMS);
int lineno = fn.getBody().getLineno(), column = fn.getBody().getColumn();
++parser.nestingOfFunction; // only for body, not params
Node body = transform(fn.getBody());
/* Process simple default parameters */
List defaultParams = fn.getDefaultParams();
if (defaultParams != null) {
for (int i = defaultParams.size() - 1; i > 0; ) {
if (defaultParams.get(i) instanceof AstNode
&& defaultParams.get(i - 1) instanceof String) {
AstNode rhs = (AstNode) defaultParams.get(i);
String name = (String) defaultParams.get(i - 1);
body.addChildToFront(
createIf(
createBinary(
Token.SHEQ,
parser.createName(name),
parser.createName("undefined")),
new Node(
Token.EXPR_VOID,
createAssignment(
Token.ASSIGN,
parser.createName(name),
transform(rhs)),
body.getLineno(),
body.getColumn()),
null,
body.getLineno(),
body.getColumn()));
}
i -= 2;
}
}
/* transform nodes used as default parameters */
List dfns = fn.getDestructuringRvalues();
if (dfns != null) {
for (var i : dfns) {
Node a = i[0];
if (i[1] instanceof AstNode) {
AstNode b = (AstNode) i[1];
a.replaceChild(b, transform(b));
}
}
}
if (destructuring != null) {
body.addChildToFront(new Node(Token.EXPR_VOID, destructuring, lineno, column));
}
int syntheticType = fn.getFunctionType();
Node pn = initFunction(fn, index, body, syntheticType);
if (mexpr != null) {
astNodePos.push(fn);
try {
pn = createAssignment(Token.ASSIGN, mexpr, pn);
} finally {
astNodePos.pop();
}
if (syntheticType != FunctionNode.FUNCTION_EXPRESSION) {
pn = createExprStatementNoReturn(pn, fn.getLineno(), fn.getColumn());
}
}
return pn;
} finally {
--parser.nestingOfFunction;
savedVars.restore();
}
}
private Node transformFunctionCall(FunctionCall node) {
astNodePos.push(node);
try {
Node transformedTarget = transform(node.getTarget());
Node call = createCallOrNew(Token.CALL, transformedTarget);
call.setLineColumnNumber(node.getLineno(), node.getColumn());
List args = node.getArguments();
for (int i = 0; i < args.size(); i++) {
AstNode arg = args.get(i);
call.addChildToBack(transform(arg));
}
if (node.isOptionalCall()) {
call.putIntProp(Node.OPTIONAL_CHAINING, 1);
}
if (transformedTarget.getIntProp(Node.SUPER_PROPERTY_ACCESS, 0) == 1) {
call.putIntProp(Node.SUPER_PROPERTY_ACCESS, 1);
}
return call;
} finally {
astNodePos.pop();
}
}
private Node transformGenExpr(GeneratorExpression node) {
Node pn;
FunctionNode fn = new FunctionNode();
fn.setSourceName(parser.currentScriptOrFn.getNextTempName());
fn.setIsGenerator();
fn.setFunctionType(FunctionNode.FUNCTION_EXPRESSION);
fn.setRequiresActivation();
Node mexpr = decompileFunctionHeader(fn);
int index = parser.currentScriptOrFn.addFunction(fn);
Parser.PerFunctionVariables savedVars = parser.createPerFunctionVariables(fn);
try {
// If we start needing to record much more codegen metadata during
// function parsing, we should lump it all into a helper class.
Node destructuring = (Node) fn.getProp(Node.DESTRUCTURING_PARAMS);
fn.removeProp(Node.DESTRUCTURING_PARAMS);
int lineno = node.getLineno(), column = node.getColumn();
++parser.nestingOfFunction; // only for body, not params
Node body = genExprTransformHelper(node);
if (destructuring != null) {
body.addChildToFront(new Node(Token.EXPR_VOID, destructuring, lineno, column));
}
int syntheticType = fn.getFunctionType();
pn = initFunction(fn, index, body, syntheticType);
if (mexpr != null) {
astNodePos.push(fn);
try {
pn = createAssignment(Token.ASSIGN, mexpr, pn);
} finally {
astNodePos.pop();
}
if (syntheticType != FunctionNode.FUNCTION_EXPRESSION) {
pn = createExprStatementNoReturn(pn, fn.getLineno(), fn.getColumn());
}
}
} finally {
--parser.nestingOfFunction;
savedVars.restore();
}
Node call = createCallOrNew(Token.CALL, pn);
call.setLineColumnNumber(node.getLineno(), node.getColumn());
return call;
}
private Node genExprTransformHelper(GeneratorExpression node) {
int lineno = node.getLineno(), column = node.getColumn();
Node expr = transform(node.getResult());
List loops = node.getLoops();
int numLoops = loops.size();
// Walk through loops, collecting and defining their iterator symbols.
Node[] iterators = new Node[numLoops];
Node[] iteratedObjs = new Node[numLoops];
for (int i = 0; i < numLoops; i++) {
GeneratorExpressionLoop acl = loops.get(i);
AstNode iter = acl.getIterator();
astNodePos.push(iter);
try {
String name = null;
if (iter.getType() == Token.NAME) {
name = iter.getString();
} else {
// destructuring assignment
name = parser.currentScriptOrFn.getNextTempName();
parser.defineSymbol(Token.LP, name, false);
expr =
createBinary(
Token.COMMA,
createAssignment(Token.ASSIGN, iter, parser.createName(name)),
expr);
}
Node init = parser.createName(name);
// Define as a let since we want the scope of the variable to
// be restricted to the array comprehension
parser.defineSymbol(Token.LET, name, false);
iterators[i] = init;
} finally {
astNodePos.pop();
}
iteratedObjs[i] = transform(acl.getIteratedObject());
}
// generate code for tmpArray.push(body)
Node yield = new Node(Token.YIELD, expr, node.getLineno(), node.getColumn());
Node body = new Node(Token.EXPR_VOID, yield, lineno, column);
if (node.getFilter() != null) {
body = createIf(transform(node.getFilter()), body, null, lineno, column);
}
// Now walk loops in reverse to build up the body statement.
int pushed = 0;
try {
for (int i = numLoops - 1; i >= 0; i--) {
GeneratorExpressionLoop acl = loops.get(i);
Scope loop =
createLoopNode(
null, // no label
acl.getLineno(),
acl.getColumn());
parser.pushScope(loop);
pushed++;
body =
createForIn(
Token.LET,
loop,
iterators[i],
iteratedObjs[i],
body,
acl,
acl.isForEach(),
acl.isForOf());
}
} finally {
for (int i = 0; i < pushed; i++) {
parser.popScope();
}
}
return body;
}
private Node transformIf(IfStatement n) {
Node cond = transform(n.getCondition());
Node ifTrue = transform(n.getThenPart());
Node ifFalse = null;
if (n.getElsePart() != null) {
ifFalse = transform(n.getElsePart());
}
return createIf(cond, ifTrue, ifFalse, n.getLineno(), n.getColumn());
}
private Node transformInfix(InfixExpression node) {
Node left = transform(node.getLeft());
Node right = transform(node.getRight());
Node binaryNode = createBinary(node.getType(), left, right);
// Since we are transforming InfixExpression -> Node, we need to copy over the column and
// line, but only for newly created nodes which have no column information set.
// createBinary() may return a Node reference with the correct line/column.
// Example: `true && ` would return the `` reference from
// createBinary
boolean nodeCreated = (binaryNode != left) && (binaryNode != right);
if (nodeCreated) {
binaryNode.setLineColumnNumber(node.getLineno(), node.getColumn());
}
return binaryNode;
}
private Node transformLabeledStatement(LabeledStatement ls) {
Label label = ls.getFirstLabel();
Node statement = transform(ls.getStatement());
// Make a target and put it _after_ the statement node. Add in the
// LABEL node, so breaks get the right target.
Node breakTarget = Node.newTarget();
Node block = new Node(Token.BLOCK, label, statement, breakTarget);
label.target = breakTarget;
return block;
}
private Node transformLetNode(LetNode node) {
parser.pushScope(node);
try {
Node vars = transformVariableInitializers(node.getVariables());
node.addChildToBack(vars);
boolean letExpr = node.getType() == Token.LETEXPR;
if (node.getBody() != null) {
node.addChildToBack(transform(node.getBody()));
}
return node;
} finally {
parser.popScope();
}
}
private Node transformLiteral(AstNode node) {
// Trying to call super as a function. See 15.4.2 Static Semantics: HasDirectSuper
// Note that this will need to change when classes are implemented, because in a class
// constructor calling "super()" _is_ allowed.
if (node.getParent() instanceof FunctionCall && node.getType() == Token.SUPER)
parser.reportError("msg.super.shorthand.function");
return node;
}
private Node transformName(Name node) {
return node;
}
private Node transformNewExpr(NewExpression node) {
Node nx = createCallOrNew(Token.NEW, transform(node.getTarget()));
nx.setLineColumnNumber(node.getLineno(), node.getColumn());
List args = node.getArguments();
for (int i = 0; i < args.size(); i++) {
AstNode arg = args.get(i);
nx.addChildToBack(transform(arg));
}
if (node.getInitializer() != null) {
nx.addChildToBack(transformObjectLiteral(node.getInitializer()));
}
return nx;
}
private Node transformNumber(NumberLiteral node) {
return node;
}
private Node transformObjectLiteral(ObjectLiteral node) {
if (node.isDestructuring()) {
return node;
}
// createObjectLiteral rewrites its argument as object
// creation plus object property entries, so later compiler
// stages don't need to know about object literals.
List elems = node.getElements();
Node object = new Node(Token.OBJECTLIT);
object.setLineColumnNumber(node.getLineno(), node.getColumn());
Object[] properties;
if (elems.isEmpty()) {
properties = ScriptRuntime.emptyArgs;
} else {
int size = elems.size(), i = 0;
properties = new Object[size];
for (ObjectProperty prop : elems) {
Object propKey = Parser.getPropKey(prop.getLeft());
if (propKey == null) {
Node theId = transform(prop.getLeft());
properties[i++] = theId;
} else {
properties[i++] = propKey;
}
Node right = transform(prop.getRight());
if (prop.isGetterMethod()) {
right = createUnary(Token.GET, right);
} else if (prop.isSetterMethod()) {
right = createUnary(Token.SET, right);
} else if (prop.isNormalMethod()) {
right = createUnary(Token.METHOD, right);
}
object.addChildToBack(right);
}
}
object.putProp(Node.OBJECT_IDS_PROP, properties);
return object;
}
private Node transformParenExpr(ParenthesizedExpression node) {
AstNode expr = node.getExpression();
while (expr instanceof ParenthesizedExpression) {
expr = ((ParenthesizedExpression) expr).getExpression();
}
Node result = transform(expr);
result.putProp(Node.PARENTHESIZED_PROP, Boolean.TRUE);
return result;
}
private Node transformComputedPropertyKey(ComputedPropertyKey node) {
Node transformedExpression = transform(node.getExpression());
return new Node(node.type, transformedExpression);
}
private Node transformPropertyGet(PropertyGet node) {
Node target = transform(node.getTarget());
String name = node.getProperty().getIdentifier();
return createPropertyGet(target, null, name, 0, node.type);
}
private Node transformTemplateLiteral(TemplateLiteral node) {
List elems = node.getElements();
// start with an empty string to ensure ToString() for each substitution
Node pn = Node.newString("");
for (AstNode elem : elems) {
if (elem.getType() != Token.TEMPLATE_CHARS) {
pn = createBinary(Token.ADD, pn, transform(elem));
} else {
TemplateCharacters chars = (TemplateCharacters) elem;
// skip empty parts, e.g. `xx${expr}xx` where xx denotes the empty string
String value = chars.getValue();
if (value.length() > 0) {
pn = createBinary(Token.ADD, pn, Node.newString(value));
}
}
}
return pn;
}
private Node transformTemplateLiteralCall(TaggedTemplateLiteral node) {
Node transformedTarget = transform(node.getTarget());
Node call = createCallOrNew(Token.CALL, transformedTarget);
call.setLineColumnNumber(node.getLineno(), node.getColumn());
if (transformedTarget.getIntProp(Node.SUPER_PROPERTY_ACCESS, 0) == 1) {
call.putIntProp(Node.SUPER_PROPERTY_ACCESS, 1);
}
TemplateLiteral templateLiteral = (TemplateLiteral) node.getTemplateLiteral();
List elems = templateLiteral.getElements();
call.addChildToBack(templateLiteral);
for (AstNode elem : elems) {
if (elem.getType() != Token.TEMPLATE_CHARS) {
call.addChildToBack(transform(elem));
}
}
parser.currentScriptOrFn.addTemplateLiteral(templateLiteral);
return call;
}
private Node transformRegExp(RegExpLiteral node) {
parser.currentScriptOrFn.addRegExp(node);
return node;
}
private Node transformReturn(ReturnStatement node) {
AstNode rv = node.getReturnValue();
Node value = rv == null ? null : transform(rv);
return rv == null
? new Node(Token.RETURN, node.getLineno(), node.getColumn())
: new Node(Token.RETURN, value, node.getLineno(), node.getColumn());
}
private Node transformScript(ScriptNode node) {
if (parser.currentScope != null) Kit.codeBug();
parser.currentScope = node;
Node body = new Node(Token.BLOCK);
for (Node kid : node) {
body.addChildToBack(transform((AstNode) kid));
}
node.removeChildren();
Node children = body.getFirstChild();
if (children != null) {
node.addChildrenToBack(children);
}
return node;
}
private Node transformString(StringLiteral node) {
Node stringNode = Node.newString(node.getValue());
stringNode.setLineColumnNumber(node.getLineno(), node.getColumn());
return stringNode;
}
private Node transformSwitch(SwitchStatement node) {
// The switch will be rewritten from:
//
// switch (expr) {
// case test1: statements1;
// ...
// default: statementsDefault;
// ...
// case testN: statementsN;
// }
//
// to:
//
// {
// switch (expr) {
// case test1: goto label1;
// ...
// case testN: goto labelN;
// }
// goto labelDefault;
// label1:
// statements1;
// ...
// labelDefault:
// statementsDefault;
// ...
// labelN:
// statementsN;
// breakLabel:
// }
//
// where inside switch each "break;" without label will be replaced
// by "goto breakLabel".
//
// If the original switch does not have the default label, then
// after the switch he transformed code would contain this goto:
// goto breakLabel;
// instead of:
// goto labelDefault;
Node switchExpr = transform(node.getExpression());
node.addChildToBack(switchExpr);
Node block = new Node(Token.BLOCK, node, node.getLineno(), node.getColumn());
for (SwitchCase sc : node.getCases()) {
AstNode expr = sc.getExpression();
Node caseExpr = null;
if (expr != null) {
caseExpr = transform(expr);
}
List stmts = sc.getStatements();
Node body = new Block();
if (stmts != null) {
for (AstNode kid : stmts) {
body.addChildToBack(transform(kid));
}
}
addSwitchCase(block, caseExpr, body);
}
closeSwitch(block);
return block;
}
private Node transformThrow(ThrowStatement node) {
Node value = transform(node.getExpression());
value.setLineColumnNumber(node.getLineno(), node.getColumn());
Node nx = new Node(Token.THROW, value);
nx.setLineColumnNumber(node.getLineno(), node.getColumn());
return nx;
}
private Node transformTry(TryStatement node) {
Node tryBlock = transform(node.getTryBlock());
Node catchBlocks = new Block();
for (CatchClause cc : node.getCatchClauses()) {
Name varName = cc.getVarName();
Node catchCond = null;
Node varNameNode = null;
if (varName != null) {
varNameNode = parser.createName(varName.getIdentifier());
AstNode ccc = cc.getCatchCondition();
if (ccc != null) {
catchCond = transform(ccc);
} else {
catchCond = new EmptyExpression();
}
}
Node body = transform(cc.getBody());
catchBlocks.addChildToBack(
createCatch(varNameNode, catchCond, body, cc.getLineno(), cc.getColumn()));
}
Node finallyBlock = null;
if (node.getFinallyBlock() != null) {
finallyBlock = transform(node.getFinallyBlock());
}
return createTryCatchFinally(
tryBlock, catchBlocks, finallyBlock, node.getLineno(), node.getColumn());
}
private Node transformUnary(UnaryExpression node) {
int type = node.getType();
if (type == Token.DEFAULTNAMESPACE) {
return transformDefaultXmlNamespace(node);
}
Node child = transform(node.getOperand());
return createUnary(type, child);
}
private Node transformUpdate(UpdateExpression node) {
int type = node.getType();
Node child = transform(node.getOperand());
return createIncDec(type, node.isPostfix(), child);
}
private Node transformVariables(VariableDeclaration node) {
transformVariableInitializers(node);
return node;
}
private Node transformVariableInitializers(VariableDeclaration node) {
List vars = node.getVariables();
for (VariableInitializer var : vars) {
AstNode target = var.getTarget();
AstNode init = var.getInitializer();
Node left = null;
if (var.isDestructuring()) {
left = target;
} else {
left = transform(target);
}
Node right = null;
if (init != null) {
right = transform(init);
}
if (var.isDestructuring()) {
if (right == null) { // TODO: should this ever happen?
node.addChildToBack(left);
} else {
astNodePos.push(var);
try {
Node d =
parser.createDestructuringAssignment(
node.getType(), left, right, this::transform);
node.addChildToBack(d);
} finally {
astNodePos.pop();
}
}
} else {
if (right != null) {
left.addChildToBack(right);
}
node.addChildToBack(left);
}
}
return node;
}
private Node transformWhileLoop(WhileLoop loop) {
loop.setType(Token.LOOP);
parser.pushScope(loop);
try {
Node cond = transform(loop.getCondition());
Node body = transform(loop.getBody());
return createLoop(loop, LOOP_WHILE, body, cond, null, null);
} finally {
parser.popScope();
}
}
private Node transformWith(WithStatement node) {
Node expr = transform(node.getExpression());
Node stmt = transform(node.getStatement());
return createWith(expr, stmt, node.getLineno(), node.getColumn());
}
private Node transformYield(Yield node) {
Node kid = node.getValue() == null ? null : transform(node.getValue());
if (kid != null) return new Node(node.getType(), kid, node.getLineno(), node.getColumn());
return new Node(node.getType(), node.getLineno(), node.getColumn());
}
private Node transformXmlLiteral(XmlLiteral node) {
// a literal like {bar} is rewritten as
// new XML("" + bar + " ");
Node pnXML = new Node(Token.NEW, node.getLineno(), node.getColumn());
List frags = node.getFragments();
XmlString first = (XmlString) frags.get(0);
boolean anon = first.getXml().trim().startsWith("<>");
pnXML.addChildToBack(parser.createName(anon ? "XMLList" : "XML"));
Node pn = null;
for (XmlFragment frag : frags) {
if (frag instanceof XmlString) {
String xml = ((XmlString) frag).getXml();
if (pn == null) {
pn = createString(xml);
} else {
pn = createBinary(Token.ADD, pn, createString(xml));
}
} else {
XmlExpression xexpr = (XmlExpression) frag;
boolean isXmlAttr = xexpr.isXmlAttribute();
Node expr;
if (xexpr.getExpression() instanceof EmptyExpression) {
expr = createString("");
} else {
expr = transform(xexpr.getExpression());
}
if (isXmlAttr) {
// Need to put the result in double quotes
expr = createUnary(Token.ESCXMLATTR, expr);
Node prepend = createBinary(Token.ADD, createString("\""), expr);
expr = createBinary(Token.ADD, prepend, createString("\""));
} else {
expr = createUnary(Token.ESCXMLTEXT, expr);
}
pn = createBinary(Token.ADD, pn, expr);
}
}
pnXML.addChildToBack(pn);
return pnXML;
}
private Node transformXmlMemberGet(XmlMemberGet node) {
XmlRef ref = node.getMemberRef();
Node pn = transform(node.getLeft());
int flags = ref.isAttributeAccess() ? Node.ATTRIBUTE_FLAG : 0;
if (node.getType() == Token.DOTDOT) {
flags |= Node.DESCENDANTS_FLAG;
}
return transformXmlRef(pn, ref, flags);
}
// We get here if we weren't a child of a . or .. infix node
private Node transformXmlRef(XmlRef node) {
int memberTypeFlags = node.isAttributeAccess() ? Node.ATTRIBUTE_FLAG : 0;
return transformXmlRef(null, node, memberTypeFlags);
}
private Node transformXmlRef(Node pn, XmlRef node, int memberTypeFlags) {
Name namespace = node.getNamespace();
String ns = namespace != null ? namespace.getIdentifier() : null;
if (node instanceof XmlPropRef) {
String name = ((XmlPropRef) node).getPropName().getIdentifier();
return createPropertyGet(pn, ns, name, memberTypeFlags, node.type);
}
Node expr = transform(((XmlElemRef) node).getExpression());
return createElementGet(pn, ns, expr, memberTypeFlags);
}
private Node transformDefaultXmlNamespace(UnaryExpression node) {
Node child = transform(node.getOperand());
return createUnary(Token.DEFAULTNAMESPACE, child);
}
private Node transformGeneratorMethodDefinition(GeneratorMethodDefinition node) {
// Unwrap the "temporary" AST node
return transform(node.getMethodName());
}
/** If caseExpression argument is null it indicates a default label. */
private static void addSwitchCase(Node switchBlock, Node caseExpression, Node statements) {
if (switchBlock.getType() != Token.BLOCK) throw Kit.codeBug();
Jump switchNode = (Jump) switchBlock.getFirstChild();
if (switchNode.getType() != Token.SWITCH) throw Kit.codeBug();
Node gotoTarget = Node.newTarget();
if (caseExpression != null) {
Jump caseNode = new Jump(Token.CASE, caseExpression);
caseNode.target = gotoTarget;
switchNode.addChildToBack(caseNode);
} else {
switchNode.setDefault(gotoTarget);
}
switchBlock.addChildToBack(gotoTarget);
switchBlock.addChildToBack(statements);
}
private static void closeSwitch(Node switchBlock) {
if (switchBlock.getType() != Token.BLOCK) throw Kit.codeBug();
Jump switchNode = (Jump) switchBlock.getFirstChild();
if (switchNode.getType() != Token.SWITCH) throw Kit.codeBug();
Node switchBreakTarget = Node.newTarget();
// switchNode.target is only used by NodeTransformer
// to detect switch end
switchNode.target = switchBreakTarget;
Node defaultTarget = switchNode.getDefault();
if (defaultTarget == null) {
defaultTarget = switchBreakTarget;
}
switchBlock.addChildAfter(makeJump(Token.GOTO, defaultTarget), switchNode);
switchBlock.addChildToBack(switchBreakTarget);
}
private static Node createExprStatementNoReturn(Node expr, int lineno, int column) {
return new Node(Token.EXPR_VOID, expr, lineno, column);
}
private static Node createString(String string) {
return Node.newString(string);
}
/**
* Catch clause of try/catch/finally
*
* @param varName the name of the variable to bind to the exception
* @param catchCond the condition under which to catch the exception. May be null if no
* condition is given.
* @param stmts the statements in the catch clause
* @param lineno the starting line number of the catch clause
* @param column the starting column number of the catch clause
*/
private Node createCatch(Node varName, Node catchCond, Node stmts, int lineno, int column) {
if (varName == null) {
varName = new Node(Token.EMPTY);
}
if (catchCond == null) {
catchCond = new Node(Token.EMPTY);
}
return new Node(Token.CATCH, varName, catchCond, stmts, lineno, column);
}
private static Node initFunction(
FunctionNode fnNode, int functionIndex, Node statements, int functionType) {
fnNode.setFunctionType(functionType);
fnNode.addChildToBack(statements);
int functionCount = fnNode.getFunctionCount();
if (functionCount != 0) {
// Functions containing other functions require activation objects
fnNode.setRequiresActivation();
}
if (functionType == FunctionNode.FUNCTION_EXPRESSION) {
Name name = fnNode.getFunctionName();
if (name != null
&& name.length() != 0
&& fnNode.getSymbol(name.getIdentifier()) == null) {
// A function expression needs to have its name as a
// variable (if it isn't already allocated as a variable).
// See ECMA Ch. 13. We add code to the beginning of the
// function to initialize a local variable of the
// function's name to the function value, but only if the
// function doesn't already define a formal parameter, var,
// or nested function with the same name.
fnNode.putSymbol(new Symbol(Token.FUNCTION, name.getIdentifier()));
Node setFn =
new Node(
Token.EXPR_VOID,
new Node(
Token.SETNAME,
Node.newString(Token.BINDNAME, name.getIdentifier()),
new Node(Token.THISFN)));
statements.addChildrenToFront(setFn);
}
}
// Add return to end if needed.
Node lastStmt = statements.getLastChild();
if (lastStmt == null || lastStmt.getType() != Token.RETURN) {
statements.addChildToBack(new Node(Token.RETURN));
}
Node result = Node.newString(Token.FUNCTION, fnNode.getName());
result.putIntProp(Node.FUNCTION_PROP, functionIndex);
return result;
}
/**
* Create loop node. The code generator will later call
* createWhile|createDoWhile|createFor|createForIn to finish loop generation.
*/
private Scope createLoopNode(Node loopLabel, int lineno, int column) {
Scope result = parser.createScopeNode(Token.LOOP, lineno, column);
if (loopLabel != null) {
((Jump) loopLabel).setLoop(result);
}
return result;
}
private static Node createFor(Scope loop, Node init, Node test, Node incr, Node body) {
if (init.getType() == Token.LET) {
// rewrite "for (let i=s; i < N; i++)..." as
// "let (i=s) { for (; i < N; i++)..." so that "s" is evaluated
// outside the scope of the for.
Scope let = Scope.splitScope(loop);
let.setType(Token.LET);
let.addChildrenToBack(init);
let.addChildToBack(createLoop(loop, LOOP_FOR, body, test, new Node(Token.EMPTY), incr));
return let;
}
return createLoop(loop, LOOP_FOR, body, test, init, incr);
}
private static Node createLoop(
Jump loop, int loopType, Node body, Node cond, Node init, Node incr) {
Node bodyTarget = Node.newTarget();
Node condTarget = Node.newTarget();
if (loopType == LOOP_FOR && cond.getType() == Token.EMPTY) {
cond = new Node(Token.TRUE);
}
Jump IFEQ = new Jump(Token.IFEQ, cond);
IFEQ.target = bodyTarget;
Node breakTarget = Node.newTarget();
loop.addChildToBack(bodyTarget);
loop.addChildrenToBack(body);
if (loopType == LOOP_WHILE || loopType == LOOP_FOR) {
// propagate lineno to condition
loop.addChildrenToBack(new Node(Token.EMPTY, loop.getLineno(), loop.getColumn()));
}
loop.addChildToBack(condTarget);
loop.addChildToBack(IFEQ);
loop.addChildToBack(breakTarget);
loop.target = breakTarget;
Node continueTarget = condTarget;
if (loopType == LOOP_WHILE || loopType == LOOP_FOR) {
// Just add a GOTO to the condition in the do..while
loop.addChildToFront(makeJump(Token.GOTO, condTarget));
if (loopType == LOOP_FOR) {
int initType = init.getType();
if (initType != Token.EMPTY) {
if (initType != Token.VAR && initType != Token.LET) {
init = new Node(Token.EXPR_VOID, init);
}
loop.addChildToFront(init);
}
Node incrTarget = Node.newTarget();
loop.addChildAfter(incrTarget, body);
if (incr.getType() != Token.EMPTY) {
incr = new Node(Token.EXPR_VOID, incr);
loop.addChildAfter(incr, incrTarget);
}
continueTarget = incrTarget;
}
}
loop.setContinue(continueTarget);
return loop;
}
/** Generate IR for a for..in loop. */
private Node createForIn(
int declType,
Node loop,
Node lhs,
Node obj,
Node body,
AstNode ast,
boolean isForEach,
boolean isForOf) {
astNodePos.push(ast);
try {
int destructuring = -1;
int destructuringLen = 0;
Node lvalue;
int type = lhs.getType();
if (type == Token.VAR || type == Token.LET) {
Node kid = lhs.getLastChild();
int kidType = kid.getType();
if (kidType == Token.ARRAYLIT || kidType == Token.OBJECTLIT) {
type = destructuring = kidType;
lvalue = kid;
destructuringLen = 0;
if (kid instanceof ArrayLiteral)
destructuringLen = ((ArrayLiteral) kid).getDestructuringLength();
} else if (kidType == Token.NAME) {
lvalue = Node.newString(Token.NAME, kid.getString());
} else {
parser.reportError("msg.bad.for.in.lhs");
return null;
}
} else if (type == Token.ARRAYLIT || type == Token.OBJECTLIT) {
destructuring = type;
lvalue = lhs;
destructuringLen = 0;
if (lhs instanceof ArrayLiteral)
destructuringLen = ((ArrayLiteral) lhs).getDestructuringLength();
} else {
lvalue = makeReference(lhs);
if (lvalue == null) {
parser.reportError("msg.bad.for.in.lhs");
return null;
}
}
Node localBlock = new Node(Token.LOCAL_BLOCK);
int initType =
isForEach
? Token.ENUM_INIT_VALUES
: isForOf
? Token.ENUM_INIT_VALUES_IN_ORDER
: (destructuring != -1
? Token.ENUM_INIT_ARRAY
: Token.ENUM_INIT_KEYS);
Node init = new Node(initType, obj);
init.putProp(Node.LOCAL_BLOCK_PROP, localBlock);
Node cond = new Node(Token.ENUM_NEXT);
cond.putProp(Node.LOCAL_BLOCK_PROP, localBlock);
Node id = new Node(Token.ENUM_ID);
id.putProp(Node.LOCAL_BLOCK_PROP, localBlock);
Node newBody = new Node(Token.BLOCK);
Node assign;
if (destructuring != -1) {
assign =
parser.createDestructuringAssignment(declType, lvalue, id, this::transform);
if (!isForEach
&& !isForOf
&& (destructuring == Token.OBJECTLIT || destructuringLen != 2)) {
// destructuring assignment is only allowed in for..each or
// with an array type of length 2 (to hold key and value)
parser.reportError("msg.bad.for.in.destruct");
}
} else {
assign = parser.simpleAssignment(lvalue, id);
}
newBody.addChildToBack(new Node(Token.EXPR_VOID, assign));
newBody.addChildToBack(body);
loop = createLoop((Jump) loop, LOOP_WHILE, newBody, cond, null, null);
loop.addChildToFront(init);
if (type == Token.VAR || type == Token.LET) loop.addChildToFront(lhs);
localBlock.addChildToBack(loop);
return localBlock;
} finally {
astNodePos.pop();
}
}
/**
* Try/Catch/Finally
*
* The IRFactory tries to express as much as possible in the tree; the responsibilities
* remaining for Codegen are to add the Java handlers: (Either (but not both) of TARGET and
* FINALLY might not be defined)
*
*
- a catch handler for javascript exceptions that unwraps the exception onto the stack and
* GOTOes to the catch target
*
*
- a finally handler
*
*
... and a goto to GOTO around these handlers.
*/
private Node createTryCatchFinally(
Node tryBlock, Node catchBlocks, Node finallyBlock, int lineno, int column) {
boolean hasFinally =
(finallyBlock != null)
&& (finallyBlock.getType() != Token.BLOCK || finallyBlock.hasChildren());
// short circuit
if (tryBlock.getType() == Token.BLOCK && !tryBlock.hasChildren() && !hasFinally) {
return tryBlock;
}
boolean hasCatch = catchBlocks.hasChildren();
// short circuit
if (!hasFinally && !hasCatch) {
// bc finally might be an empty block...
return tryBlock;
}
Node handlerBlock = new Node(Token.LOCAL_BLOCK);
Jump pn = new Jump(Token.TRY, tryBlock);
pn.setLineColumnNumber(lineno, column);
pn.putProp(Node.LOCAL_BLOCK_PROP, handlerBlock);
if (hasCatch) {
// jump around catch code
Node endCatch = Node.newTarget();
pn.addChildToBack(makeJump(Token.GOTO, endCatch));
// make a TARGET for the catch that the tcf node knows about
Node catchTarget = Node.newTarget();
pn.target = catchTarget;
// mark it
pn.addChildToBack(catchTarget);
//
// Given
//
// try {
// tryBlock;
// } catch (e if condition1) {
// something1;
// ...
//
// } catch (e if conditionN) {
// somethingN;
// } catch (e) {
// somethingDefault;
// }
//
// rewrite as
//
// try {
// tryBlock;
// goto after_catch:
// } catch (x) {
// with (newCatchScope(e, x)) {
// if (condition1) {
// something1;
// goto after_catch;
// }
// }
// ...
// with (newCatchScope(e, x)) {
// if (conditionN) {
// somethingN;
// goto after_catch;
// }
// }
// with (newCatchScope(e, x)) {
// somethingDefault;
// goto after_catch;
// }
// }
// after_catch:
//
// If there is no default catch, then the last with block
// around "somethingDefault;" is replaced by "rethrow;"
// It is assumed that catch handler generation will store
// exception object in handlerBlock register
// Block with local for exception scope objects
Node catchScopeBlock = new Node(Token.LOCAL_BLOCK);
// expects catchblocks children to be (cond block) pairs.
Node cb = catchBlocks.getFirstChild();
boolean hasDefault = false;
int scopeIndex = 0;
while (cb != null) {
int catchLineno = cb.getLineno(), catchColumn = cb.getColumn();
Node name = cb.getFirstChild();
Node cond = name.getNext();
Node catchStatement = cond.getNext();
cb.removeChild(name);
cb.removeChild(cond);
cb.removeChild(catchStatement);
// Add goto to the catch statement to jump out of catch
// but prefix it with LEAVEWITH since try..catch produces
// "with"code in order to limit the scope of the exception
// object.
catchStatement.addChildToBack(new Node(Token.LEAVEWITH));
catchStatement.addChildToBack(makeJump(Token.GOTO, endCatch));
// Create condition "if" when present
Node condStmt;
if (cond.getType() == Token.EMPTY) {
condStmt = catchStatement;
hasDefault = true;
} else {
condStmt = createIf(cond, catchStatement, null, catchLineno, catchColumn);
}
// Generate code to create the scope object and store
// it in catchScopeBlock register
Node catchScope = new Node(Token.CATCH_SCOPE, name, createUseLocal(handlerBlock));
catchScope.putProp(Node.LOCAL_BLOCK_PROP, catchScopeBlock);
catchScope.putIntProp(Node.CATCH_SCOPE_PROP, scopeIndex);
catchScopeBlock.addChildToBack(catchScope);
// Add with statement based on catch scope object
catchScopeBlock.addChildToBack(
createWith(
createUseLocal(catchScopeBlock),
condStmt,
catchLineno,
catchColumn));
// move to next cb
cb = cb.getNext();
++scopeIndex;
}
pn.addChildToBack(catchScopeBlock);
if (!hasDefault) {
// Generate code to rethrow if no catch clause was executed
Node rethrow = new Node(Token.RETHROW);
rethrow.putProp(Node.LOCAL_BLOCK_PROP, handlerBlock);
pn.addChildToBack(rethrow);
}
pn.addChildToBack(endCatch);
}
if (hasFinally) {
Node finallyTarget = Node.newTarget();
pn.setFinally(finallyTarget);
// add jsr finally to the try block
pn.addChildToBack(makeJump(Token.JSR, finallyTarget));
// jump around finally code
Node finallyEnd = Node.newTarget();
pn.addChildToBack(makeJump(Token.GOTO, finallyEnd));
pn.addChildToBack(finallyTarget);
Node fBlock = new Node(Token.FINALLY, finallyBlock);
fBlock.putProp(Node.LOCAL_BLOCK_PROP, handlerBlock);
pn.addChildToBack(fBlock);
pn.addChildToBack(finallyEnd);
}
handlerBlock.addChildToBack(pn);
return handlerBlock;
}
private Node createWith(Node obj, Node body, int lineno, int column) {
parser.setRequiresActivation();
Node result = new Node(Token.BLOCK, lineno, column);
result.addChildToBack(new Node(Token.ENTERWITH, obj));
Node bodyNode = new Node(Token.WITH, body, lineno, column);
result.addChildrenToBack(bodyNode);
result.addChildToBack(new Node(Token.LEAVEWITH));
return result;
}
private static Node createIf(Node cond, Node ifTrue, Node ifFalse, int lineno, int column) {
int condStatus = isAlwaysDefinedBoolean(cond);
if (condStatus == ALWAYS_TRUE_BOOLEAN) {
return ifTrue;
} else if (condStatus == ALWAYS_FALSE_BOOLEAN) {
if (ifFalse != null) {
return ifFalse;
}
// Replace if (false) xxx by empty block
return new Node(Token.BLOCK, lineno, column);
}
Node result = new Node(Token.BLOCK, lineno, column);
Node ifNotTarget = Node.newTarget();
Jump IFNE = new Jump(Token.IFNE, cond);
IFNE.target = ifNotTarget;
result.addChildToBack(IFNE);
result.addChildrenToBack(ifTrue);
if (ifFalse != null) {
Node endTarget = Node.newTarget();
result.addChildToBack(makeJump(Token.GOTO, endTarget));
result.addChildToBack(ifNotTarget);
result.addChildrenToBack(ifFalse);
result.addChildToBack(endTarget);
} else {
result.addChildToBack(ifNotTarget);
}
if (cond.getFirstChild() != null) {
Node conditionalChild = cond.getFirstChild();
result.setLineColumnNumber(conditionalChild.getLineno(), conditionalChild.getColumn());
}
return result;
}
private static Node createCondExpr(Node cond, Node ifTrue, Node ifFalse) {
int condStatus = isAlwaysDefinedBoolean(cond);
if (condStatus == ALWAYS_TRUE_BOOLEAN) {
return ifTrue;
} else if (condStatus == ALWAYS_FALSE_BOOLEAN) {
return ifFalse;
}
return new Node(Token.HOOK, cond, ifTrue, ifFalse);
}
private static Node createUnary(int nodeType, Node child) {
int childType = child.getType();
switch (nodeType) {
case Token.DELPROP:
{
Node n;
if (childType == Token.NAME) {
// Transform Delete(Name "a")
// to Delete(Bind("a"), String("a"))
child.setType(Token.BINDNAME);
Node right = Node.newString(child.getString());
n = new Node(nodeType, child, right);
} else if (childType == Token.GETPROP || childType == Token.GETELEM) {
Node left = child.getFirstChild();
Node right = child.getLastChild();
child.removeChild(left);
child.removeChild(right);
n = new Node(nodeType, left, right);
} else if (childType == Token.GET_REF) {
Node ref = child.getFirstChild();
child.removeChild(ref);
n = new Node(Token.DEL_REF, ref);
} else {
// Always evaluate delete operand, see ES5 11.4.1 & bug #726121
n = new Node(nodeType, new Node(Token.TRUE), child);
}
if (child.getIntProp(Node.SUPER_PROPERTY_ACCESS, 0) == 1) {
n.putIntProp(Node.SUPER_PROPERTY_ACCESS, 1);
}
return n;
}
case Token.TYPEOF:
if (childType == Token.NAME) {
child.setType(Token.TYPEOFNAME);
return child;
}
break;
case Token.BITNOT:
if (childType == Token.NUMBER) {
int value = ScriptRuntime.toInt32(child.getDouble());
child.setDouble(~value);
return child;
}
break;
case Token.NEG:
if (childType == Token.NUMBER) {
child.setDouble(-child.getDouble());
return child;
}
break;
case Token.NOT:
{
int status = isAlwaysDefinedBoolean(child);
if (status != 0) {
int type;
if (status == ALWAYS_TRUE_BOOLEAN) {
type = Token.FALSE;
} else {
type = Token.TRUE;
}
if (childType == Token.TRUE || childType == Token.FALSE) {
child.setType(type);
return child;
}
return new Node(type);
}
break;
}
}
return new Node(nodeType, child);
}
private Node createCallOrNew(int nodeType, Node child) {
int type = Node.NON_SPECIALCALL;
if (child.getType() == Token.NAME) {
String name = child.getString();
if (name.equals("eval")) {
type = Node.SPECIALCALL_EVAL;
} else if (name.equals("With")) {
type = Node.SPECIALCALL_WITH;
}
} else if (child.getType() == Token.GETPROP) {
String name = child.getLastChild().getString();
if (name.equals("eval")) {
type = Node.SPECIALCALL_EVAL;
}
}
Node node = new Node(nodeType, child);
if (type != Node.NON_SPECIALCALL) {
// Calls to these functions require activation objects.
parser.setRequiresActivation();
node.putIntProp(Node.SPECIALCALL_PROP, type);
}
return node;
}
private static Node createIncDec(int nodeType, boolean post, Node child) {
child = makeReference(child);
int childType = child.getType();
switch (childType) {
case Token.NAME:
case Token.GETPROP:
case Token.GETELEM:
case Token.GET_REF:
{
Node n = new Node(nodeType, child);
int incrDecrMask = 0;
if (nodeType == Token.DEC) {
incrDecrMask |= Node.DECR_FLAG;
}
if (post) {
incrDecrMask |= Node.POST_FLAG;
}
n.putIntProp(Node.INCRDECR_PROP, incrDecrMask);
return n;
}
}
throw Kit.codeBug();
}
private Node createPropertyGet(
Node target, String namespace, String name, int memberTypeFlags, int type) {
if (namespace == null && memberTypeFlags == 0) {
if (target == null) {
return parser.createName(name);
}
parser.checkActivationName(name, Token.GETPROP);
if (ScriptRuntime.isSpecialProperty(name)) {
if (target.getType() == Token.SUPER) {
// We have an access to super.__proto__ or super.__parent__.
// This needs to behave in the same way as this.__proto__ - it really is not
// obvious why, but you can test it in v8 or any other engine. So, we just
// replace SUPER with THIS in the AST. It's a bit hacky, but it works - see the
// test cases in SuperTest!
if (!(target instanceof KeywordLiteral)) {
throw Kit.codeBug();
}
KeywordLiteral oldTarget = (KeywordLiteral) target;
target =
new KeywordLiteral(
oldTarget.getPosition(), oldTarget.getLength(), Token.THIS);
target.setLineColumnNumber(oldTarget.getLineno(), oldTarget.getColumn());
}
Node ref = new Node(Token.REF_SPECIAL, target);
ref.putProp(Node.NAME_PROP, name);
Node getRef = new Node(Token.GET_REF, ref);
if (type == Token.QUESTION_DOT) {
ref.putIntProp(Node.OPTIONAL_CHAINING, 1);
getRef.putIntProp(Node.OPTIONAL_CHAINING, 1);
}
return getRef;
}
Node node = new Node(Token.GETPROP, target, Node.newString(name));
if (type == Token.QUESTION_DOT) {
node.putIntProp(Node.OPTIONAL_CHAINING, 1);
}
if (target.getType() == Token.SUPER) {
node.putIntProp(Node.SUPER_PROPERTY_ACCESS, 1);
}
return node;
}
Node elem = Node.newString(name);
memberTypeFlags |= Node.PROPERTY_FLAG;
return createMemberRefGet(target, namespace, elem, memberTypeFlags);
}
/**
* @param target the node before the LB
* @param namespace optional namespace
* @param elem the node in the brackets
* @param memberTypeFlags E4X flags
*/
private Node createElementGet(Node target, String namespace, Node elem, int memberTypeFlags) {
// OPT: could optimize to createPropertyGet
// iff elem is string that can not be number
if (namespace == null && memberTypeFlags == 0) {
// stand-alone [aaa] as primary expression is array literal
// declaration and should not come here!
if (target == null) throw Kit.codeBug();
return new Node(Token.GETELEM, target, elem);
}
return createMemberRefGet(target, namespace, elem, memberTypeFlags);
}
private Node createMemberRefGet(Node target, String namespace, Node elem, int memberTypeFlags) {
Node nsNode = null;
if (namespace != null) {
// See 11.1.2 in ECMA 357
if (namespace.equals("*")) {
nsNode = new Node(Token.NULL);
} else {
nsNode = parser.createName(namespace);
}
}
Node ref;
if (target == null) {
if (namespace == null) {
ref = new Node(Token.REF_NAME, elem);
} else {
ref = new Node(Token.REF_NS_NAME, nsNode, elem);
}
} else {
if (namespace == null) {
ref = new Node(Token.REF_MEMBER, target, elem);
} else {
ref = new Node(Token.REF_NS_MEMBER, target, nsNode, elem);
}
}
if (memberTypeFlags != 0) {
ref.putIntProp(Node.MEMBER_TYPE_PROP, memberTypeFlags);
}
return new Node(Token.GET_REF, ref);
}
private static Node createBinary(int nodeType, Node left, Node right) {
switch (nodeType) {
case Token.ADD:
// numerical addition and string concatenation
if (left.type == Token.STRING) {
String s2;
if (right.type == Token.STRING) {
s2 = right.getString();
} else if (right.type == Token.NUMBER) {
s2 = ScriptRuntime.numberToString(right.getDouble(), 10);
} else {
break;
}
String s1 = left.getString();
left.setString(s1.concat(s2));
return left;
} else if (left.type == Token.NUMBER) {
if (right.type == Token.NUMBER) {
left.setDouble(left.getDouble() + right.getDouble());
return left;
} else if (right.type == Token.STRING) {
String s1, s2;
s1 = ScriptRuntime.numberToString(left.getDouble(), 10);
s2 = right.getString();
right.setString(s1.concat(s2));
return right;
}
}
// can't do anything if we don't know both types - since
// 0 + object is supposed to call toString on the object and do
// string concatenation rather than addition
break;
case Token.SUB:
// numerical subtraction
if (left.type == Token.NUMBER) {
double ld = left.getDouble();
if (right.type == Token.NUMBER) {
// both numbers
left.setDouble(ld - right.getDouble());
return left;
} else if (ld == 0.0) {
// first 0: 0-x -> -x
return new Node(Token.NEG, right);
}
} else if (right.type == Token.NUMBER) {
if (right.getDouble() == 0.0) {
// second 0: x - 0 -> +x
// can not make simply x because x - 0 must be number
return new Node(Token.POS, left);
}
}
break;
case Token.MUL:
// numerical multiplication
if (left.type == Token.NUMBER) {
double ld = left.getDouble();
if (right.type == Token.NUMBER) {
// both numbers
left.setDouble(ld * right.getDouble());
return left;
} else if (ld == 1.0) {
// first 1: 1 * x -> +x
return new Node(Token.POS, right);
}
} else if (right.type == Token.NUMBER) {
if (right.getDouble() == 1.0) {
// second 1: x * 1 -> +x
// can not make simply x because x - 0 must be number
return new Node(Token.POS, left);
}
}
// can't do x*0: Infinity * 0 gives NaN, not 0
break;
case Token.DIV:
// number division
if (right.type == Token.NUMBER) {
double rd = right.getDouble();
if (left.type == Token.NUMBER) {
// both constants -- just divide, trust Java to handle x/0
left.setDouble(left.getDouble() / rd);
return left;
} else if (rd == 1.0) {
// second 1: x/1 -> +x
// not simply x to force number conversion
return new Node(Token.POS, left);
}
}
break;
case Token.AND:
{
// Since x && y gives x, not false, when Boolean(x) is false,
// and y, not Boolean(y), when Boolean(x) is true, x && y
// can only be simplified if x is defined. See bug 309957.
int leftStatus = isAlwaysDefinedBoolean(left);
if (leftStatus == ALWAYS_FALSE_BOOLEAN) {
// if the first one is false, just return it
return left;
} else if (leftStatus == ALWAYS_TRUE_BOOLEAN) {
// if first is true, set to second
return right;
}
break;
}
case Token.OR:
{
// Since x || y gives x, not true, when Boolean(x) is true,
// and y, not Boolean(y), when Boolean(x) is false, x || y
// can only be simplified if x is defined. See bug 309957.
int leftStatus = isAlwaysDefinedBoolean(left);
if (leftStatus == ALWAYS_TRUE_BOOLEAN) {
// if the first one is true, just return it
return left;
} else if (leftStatus == ALWAYS_FALSE_BOOLEAN) {
// if first is false, set to second
return right;
}
break;
}
}
return new Node(nodeType, left, right);
}
private Node createAssignment(int assignType, Node left, Node right) {
Node ref = makeReference(left);
if (ref == null) {
if (left.getType() == Token.ARRAYLIT || left.getType() == Token.OBJECTLIT) {
if (assignType != Token.ASSIGN) {
parser.reportError("msg.bad.destruct.op");
return right;
}
return parser.createDestructuringAssignment(-1, left, right, this::transform);
}
parser.reportError("msg.bad.assign.left");
return right;
}
left = ref;
int assignOp;
switch (assignType) {
case Token.ASSIGN:
{
return propagateSuperFromLhs(parser.simpleAssignment(left, right), left);
}
case Token.ASSIGN_BITOR:
assignOp = Token.BITOR;
break;
case Token.ASSIGN_LOGICAL_OR:
assignOp = Token.OR;
break;
case Token.ASSIGN_BITXOR:
assignOp = Token.BITXOR;
break;
case Token.ASSIGN_BITAND:
assignOp = Token.BITAND;
break;
case Token.ASSIGN_LOGICAL_AND:
assignOp = Token.AND;
break;
case Token.ASSIGN_LSH:
assignOp = Token.LSH;
break;
case Token.ASSIGN_RSH:
assignOp = Token.RSH;
break;
case Token.ASSIGN_URSH:
assignOp = Token.URSH;
break;
case Token.ASSIGN_ADD:
assignOp = Token.ADD;
break;
case Token.ASSIGN_SUB:
assignOp = Token.SUB;
break;
case Token.ASSIGN_MUL:
assignOp = Token.MUL;
break;
case Token.ASSIGN_DIV:
assignOp = Token.DIV;
break;
case Token.ASSIGN_MOD:
assignOp = Token.MOD;
break;
case Token.ASSIGN_EXP:
assignOp = Token.EXP;
break;
case Token.ASSIGN_NULLISH:
assignOp = Token.NULLISH_COALESCING;
break;
default:
throw Kit.codeBug();
}
int nodeType = left.getType();
switch (nodeType) {
case Token.NAME:
{
Node op = new Node(assignOp, left, right);
Node lvalueLeft = Node.newString(Token.BINDNAME, left.getString());
return propagateSuperFromLhs(new Node(Token.SETNAME, lvalueLeft, op), left);
}
case Token.GETPROP:
case Token.GETELEM:
{
Node obj = left.getFirstChild();
Node id = left.getLastChild();
int type = nodeType == Token.GETPROP ? Token.SETPROP_OP : Token.SETELEM_OP;
Node opLeft = new Node(Token.USE_STACK);
Node op = new Node(assignOp, opLeft, right);
return propagateSuperFromLhs(new Node(type, obj, id, op), left);
}
case Token.GET_REF:
{
ref = left.getFirstChild();
parser.checkMutableReference(ref);
Node opLeft = new Node(Token.USE_STACK);
Node op = new Node(assignOp, opLeft, right);
return propagateSuperFromLhs(new Node(Token.SET_REF_OP, ref, op), left);
}
}
throw Kit.codeBug();
}
private Node propagateSuperFromLhs(Node result, Node left) {
if (left.getIntProp(Node.SUPER_PROPERTY_ACCESS, 0) == 1) {
result.putIntProp(Node.SUPER_PROPERTY_ACCESS, 1);
}
return result;
}
private static Node createUseLocal(Node localBlock) {
if (Token.LOCAL_BLOCK != localBlock.getType()) throw Kit.codeBug();
Node result = new Node(Token.LOCAL_LOAD);
result.putProp(Node.LOCAL_BLOCK_PROP, localBlock);
return result;
}
private static Jump makeJump(int type, Node target) {
Jump n = new Jump(type);
n.target = target;
return n;
}
private static Node makeReference(Node node) {
int type = node.getType();
switch (type) {
case Token.NAME:
case Token.GETPROP:
case Token.GETELEM:
case Token.GET_REF:
return node;
case Token.CALL:
node.setType(Token.REF_CALL);
return new Node(Token.GET_REF, node);
}
// Signal caller to report error
return null;
}
// Check if Node always mean true or false in boolean context
private static int isAlwaysDefinedBoolean(Node node) {
switch (node.getType()) {
case Token.FALSE:
case Token.NULL:
return ALWAYS_FALSE_BOOLEAN;
case Token.TRUE:
return ALWAYS_TRUE_BOOLEAN;
case Token.NUMBER:
{
double num = node.getDouble();
if (!Double.isNaN(num) && num != 0.0) {
return ALWAYS_TRUE_BOOLEAN;
}
return ALWAYS_FALSE_BOOLEAN;
}
}
return 0;
}
// Check if node is the target of a destructuring bind.
boolean isDestructuring(Node n) {
return n instanceof DestructuringForm && ((DestructuringForm) n).isDestructuring();
}
Node decompileFunctionHeader(FunctionNode fn) {
if (fn.getFunctionName() != null) {
return null;
} else if (fn.getMemberExprNode() != null) {
return transform(fn.getMemberExprNode());
}
return null;
}
public static class AstNodePosition implements Parser.CurrentPositionReporter {
private ArrayDeque stack;
private String sourceString;
private int savedLineno = -1;
private String savedLine;
private int savedLineOffset;
public AstNodePosition(String sourceString) {
stack = new ArrayDeque<>();
this.sourceString = sourceString;
}
public void push(AstNode node) {
stack.push(node);
}
public void pop() {
stack.pop();
}
@Override
public int getPosition() {
return stack.peek().getAbsolutePosition();
}
@Override
public int getLength() {
return stack.peek().getLength();
}
@Override
public int getLineno() {
return stack.peek().getLineno();
}
private void cutAndSaveLine() {
int lineno = getLineno();
if (savedLineno == lineno) {
return;
}
int l = 1;
boolean isPrevCR = false;
int begin = 0;
for (; begin < sourceString.length(); begin++) {
char c = sourceString.charAt(begin);
if (isPrevCR && c == '\n') {
continue;
}
isPrevCR = (c == '\r');
if (l == lineno) {
break;
}
if (ScriptRuntime.isJSLineTerminator(c)) {
l++;
}
}
int end = begin;
for (; end < sourceString.length(); end++) {
char c = sourceString.charAt(end);
if (ScriptRuntime.isJSLineTerminator(c)) {
break;
}
}
savedLineno = lineno;
if (end == 0) {
savedLine = "";
savedLineOffset = 0;
} else {
savedLine = sourceString.substring(begin, end);
savedLineOffset = getPosition() - begin + 1;
}
}
@Override
public String getLine() {
cutAndSaveLine();
return savedLine;
}
@Override
public int getOffset() {
cutAndSaveLine();
return savedLineOffset;
}
}
}
