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CaRMtl/org/mozilla/javascript/Interpreter.java
Glen Whitney c312811084 Make first real commit: copy of CaRMetal 4.2.8
2018-09-04 22:51:42 -04:00

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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Patrick Beard
* Norris Boyd
* Igor Bukanov
* Ethan Hugg
* Bob Jervis
* Terry Lucas
* Roger Lawrence
* Milen Nankov
* Hannes Wallnoefer
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript;
import java.io.PrintStream;
import java.io.Serializable;
import java.util.List;
import java.util.ArrayList;
import org.mozilla.javascript.ScriptRuntime.NoSuchMethodShim;
import org.mozilla.javascript.debug.DebugFrame;
public class Interpreter implements Evaluator
{
// Additional interpreter-specific codes
private static final int
// Stack: ... value1 -> ... value1 value1
Icode_DUP = -1,
// Stack: ... value2 value1 -> ... value2 value1 value2 value1
Icode_DUP2 = -2,
// Stack: ... value2 value1 -> ... value1 value2
Icode_SWAP = -3,
// Stack: ... value1 -> ...
Icode_POP = -4,
// Store stack top into return register and then pop it
Icode_POP_RESULT = -5,
// To jump conditionally and pop additional stack value
Icode_IFEQ_POP = -6,
// various types of ++/--
Icode_VAR_INC_DEC = -7,
Icode_NAME_INC_DEC = -8,
Icode_PROP_INC_DEC = -9,
Icode_ELEM_INC_DEC = -10,
Icode_REF_INC_DEC = -11,
// load/save scope from/to local
Icode_SCOPE_LOAD = -12,
Icode_SCOPE_SAVE = -13,
Icode_TYPEOFNAME = -14,
// helper for function calls
Icode_NAME_AND_THIS = -15,
Icode_PROP_AND_THIS = -16,
Icode_ELEM_AND_THIS = -17,
Icode_VALUE_AND_THIS = -18,
// Create closure object for nested functions
Icode_CLOSURE_EXPR = -19,
Icode_CLOSURE_STMT = -20,
// Special calls
Icode_CALLSPECIAL = -21,
// To return undefined value
Icode_RETUNDEF = -22,
// Exception handling implementation
Icode_GOSUB = -23,
Icode_STARTSUB = -24,
Icode_RETSUB = -25,
// To indicating a line number change in icodes.
Icode_LINE = -26,
// To store shorts and ints inline
Icode_SHORTNUMBER = -27,
Icode_INTNUMBER = -28,
// To create and populate array to hold values for [] and {} literals
Icode_LITERAL_NEW = -29,
Icode_LITERAL_SET = -30,
// Array literal with skipped index like [1,,2]
Icode_SPARE_ARRAYLIT = -31,
// Load index register to prepare for the following index operation
Icode_REG_IND_C0 = -32,
Icode_REG_IND_C1 = -33,
Icode_REG_IND_C2 = -34,
Icode_REG_IND_C3 = -35,
Icode_REG_IND_C4 = -36,
Icode_REG_IND_C5 = -37,
Icode_REG_IND1 = -38,
Icode_REG_IND2 = -39,
Icode_REG_IND4 = -40,
// Load string register to prepare for the following string operation
Icode_REG_STR_C0 = -41,
Icode_REG_STR_C1 = -42,
Icode_REG_STR_C2 = -43,
Icode_REG_STR_C3 = -44,
Icode_REG_STR1 = -45,
Icode_REG_STR2 = -46,
Icode_REG_STR4 = -47,
// Version of getvar/setvar that read var index directly from bytecode
Icode_GETVAR1 = -48,
Icode_SETVAR1 = -49,
// Load unefined
Icode_UNDEF = -50,
Icode_ZERO = -51,
Icode_ONE = -52,
// entrance and exit from .()
Icode_ENTERDQ = -53,
Icode_LEAVEDQ = -54,
Icode_TAIL_CALL = -55,
// Clear local to allow GC its context
Icode_LOCAL_CLEAR = -56,
// Literal get/set
Icode_LITERAL_GETTER = -57,
Icode_LITERAL_SETTER = -58,
// const
Icode_SETCONST = -59,
Icode_SETCONSTVAR = -60,
Icode_SETCONSTVAR1 = -61,
// Generator opcodes (along with Token.YIELD)
Icode_GENERATOR = -62,
Icode_GENERATOR_END = -63,
Icode_DEBUGGER = -64,
// Last icode
MIN_ICODE = -64;
// data for parsing
private CompilerEnvirons compilerEnv;
private boolean itsInFunctionFlag;
private boolean itsInTryFlag;
private InterpreterData itsData;
private ScriptOrFnNode scriptOrFn;
private int itsICodeTop;
private int itsStackDepth;
private int itsLineNumber;
private int itsDoubleTableTop;
private ObjToIntMap itsStrings = new ObjToIntMap(20);
private int itsLocalTop;
private static final int MIN_LABEL_TABLE_SIZE = 32;
private static final int MIN_FIXUP_TABLE_SIZE = 40;
private int[] itsLabelTable;
private int itsLabelTableTop;
// itsFixupTable[i] = (label_index << 32) | fixup_site
private long[] itsFixupTable;
private int itsFixupTableTop;
private ObjArray itsLiteralIds = new ObjArray();
private int itsExceptionTableTop;
private static final int EXCEPTION_TRY_START_SLOT = 0;
private static final int EXCEPTION_TRY_END_SLOT = 1;
private static final int EXCEPTION_HANDLER_SLOT = 2;
private static final int EXCEPTION_TYPE_SLOT = 3;
private static final int EXCEPTION_LOCAL_SLOT = 4;
private static final int EXCEPTION_SCOPE_SLOT = 5;
// SLOT_SIZE: space for try start/end, handler, start, handler type,
// exception local and scope local
private static final int EXCEPTION_SLOT_SIZE = 6;
// ECF_ or Expression Context Flags constants: for now only TAIL is available
private static final int ECF_TAIL = 1 << 0;
/**
* Class to hold data corresponding to one interpreted call stack frame.
*/
private static class CallFrame implements Cloneable, Serializable
{
static final long serialVersionUID = -2843792508994958978L;
CallFrame parentFrame;
// amount of stack frames before this one on the interpretation stack
int frameIndex;
// If true indicates read-only frame that is a part of continuation
boolean frozen;
InterpretedFunction fnOrScript;
InterpreterData idata;
// Stack structure
// stack[0 <= i < localShift]: arguments and local variables
// stack[localShift <= i <= emptyStackTop]: used for local temporaries
// stack[emptyStackTop < i < stack.length]: stack data
// sDbl[i]: if stack[i] is UniqueTag.DOUBLE_MARK, sDbl[i] holds the number value
Object[] stack;
int[] stackAttributes;
double[] sDbl;
CallFrame varSource; // defaults to this unless continuation frame
int localShift;
int emptyStackTop;
DebugFrame debuggerFrame;
boolean useActivation;
boolean isContinuationsTopFrame;
Scriptable thisObj;
Scriptable[] scriptRegExps;
// The values that change during interpretation
Object result;
double resultDbl;
int pc;
int pcPrevBranch;
int pcSourceLineStart;
Scriptable scope;
int savedStackTop;
int savedCallOp;
Object throwable;
CallFrame cloneFrozen()
{
if (!frozen) Kit.codeBug();
CallFrame copy;
try {
copy = (CallFrame)clone();
} catch (CloneNotSupportedException ex) {
throw new IllegalStateException();
}
// clone stack but keep varSource to point to values
// from this frame to share variables.
copy.stack = stack.clone();
copy.stackAttributes = stackAttributes.clone();
copy.sDbl = sDbl.clone();
copy.frozen = false;
return copy;
}
}
private static final class ContinuationJump implements Serializable
{
static final long serialVersionUID = 7687739156004308247L;
CallFrame capturedFrame;
CallFrame branchFrame;
Object result;
double resultDbl;
ContinuationJump(NativeContinuation c, CallFrame current)
{
this.capturedFrame = (CallFrame)c.getImplementation();
if (this.capturedFrame == null || current == null) {
// Continuation and current execution does not share
// any frames if there is nothing to capture or
// if there is no currently executed frames
this.branchFrame = null;
} else {
// Search for branch frame where parent frame chains starting
// from captured and current meet.
CallFrame chain1 = this.capturedFrame;
CallFrame chain2 = current;
// First work parents of chain1 or chain2 until the same
// frame depth.
int diff = chain1.frameIndex - chain2.frameIndex;
if (diff != 0) {
if (diff < 0) {
// swap to make sure that
// chain1.frameIndex > chain2.frameIndex and diff > 0
chain1 = current;
chain2 = this.capturedFrame;
diff = -diff;
}
do {
chain1 = chain1.parentFrame;
} while (--diff != 0);
if (chain1.frameIndex != chain2.frameIndex) Kit.codeBug();
}
// Now walk parents in parallel until a shared frame is found
// or until the root is reached.
while (chain1 != chain2 && chain1 != null) {
chain1 = chain1.parentFrame;
chain2 = chain2.parentFrame;
}
this.branchFrame = chain1;
if (this.branchFrame != null && !this.branchFrame.frozen)
Kit.codeBug();
}
}
}
private static CallFrame captureFrameForGenerator(CallFrame frame) {
frame.frozen = true;
CallFrame result = frame.cloneFrozen();
frame.frozen = false;
// now isolate this frame from its previous context
result.parentFrame = null;
result.frameIndex = 0;
return result;
}
static {
// Checks for byte code consistencies, good compiler can eliminate them
if (Token.LAST_BYTECODE_TOKEN > 127) {
String str = "Violation of Token.LAST_BYTECODE_TOKEN <= 127";
System.err.println(str);
throw new IllegalStateException(str);
}
if (MIN_ICODE < -128) {
String str = "Violation of Interpreter.MIN_ICODE >= -128";
System.err.println(str);
throw new IllegalStateException(str);
}
}
private static String bytecodeName(int bytecode)
{
if (!validBytecode(bytecode)) {
throw new IllegalArgumentException(String.valueOf(bytecode));
}
if (!Token.printICode) {
return String.valueOf(bytecode);
}
if (validTokenCode(bytecode)) {
return Token.name(bytecode);
}
switch (bytecode) {
case Icode_DUP: return "DUP";
case Icode_DUP2: return "DUP2";
case Icode_SWAP: return "SWAP";
case Icode_POP: return "POP";
case Icode_POP_RESULT: return "POP_RESULT";
case Icode_IFEQ_POP: return "IFEQ_POP";
case Icode_VAR_INC_DEC: return "VAR_INC_DEC";
case Icode_NAME_INC_DEC: return "NAME_INC_DEC";
case Icode_PROP_INC_DEC: return "PROP_INC_DEC";
case Icode_ELEM_INC_DEC: return "ELEM_INC_DEC";
case Icode_REF_INC_DEC: return "REF_INC_DEC";
case Icode_SCOPE_LOAD: return "SCOPE_LOAD";
case Icode_SCOPE_SAVE: return "SCOPE_SAVE";
case Icode_TYPEOFNAME: return "TYPEOFNAME";
case Icode_NAME_AND_THIS: return "NAME_AND_THIS";
case Icode_PROP_AND_THIS: return "PROP_AND_THIS";
case Icode_ELEM_AND_THIS: return "ELEM_AND_THIS";
case Icode_VALUE_AND_THIS: return "VALUE_AND_THIS";
case Icode_CLOSURE_EXPR: return "CLOSURE_EXPR";
case Icode_CLOSURE_STMT: return "CLOSURE_STMT";
case Icode_CALLSPECIAL: return "CALLSPECIAL";
case Icode_RETUNDEF: return "RETUNDEF";
case Icode_GOSUB: return "GOSUB";
case Icode_STARTSUB: return "STARTSUB";
case Icode_RETSUB: return "RETSUB";
case Icode_LINE: return "LINE";
case Icode_SHORTNUMBER: return "SHORTNUMBER";
case Icode_INTNUMBER: return "INTNUMBER";
case Icode_LITERAL_NEW: return "LITERAL_NEW";
case Icode_LITERAL_SET: return "LITERAL_SET";
case Icode_SPARE_ARRAYLIT: return "SPARE_ARRAYLIT";
case Icode_REG_IND_C0: return "REG_IND_C0";
case Icode_REG_IND_C1: return "REG_IND_C1";
case Icode_REG_IND_C2: return "REG_IND_C2";
case Icode_REG_IND_C3: return "REG_IND_C3";
case Icode_REG_IND_C4: return "REG_IND_C4";
case Icode_REG_IND_C5: return "REG_IND_C5";
case Icode_REG_IND1: return "LOAD_IND1";
case Icode_REG_IND2: return "LOAD_IND2";
case Icode_REG_IND4: return "LOAD_IND4";
case Icode_REG_STR_C0: return "REG_STR_C0";
case Icode_REG_STR_C1: return "REG_STR_C1";
case Icode_REG_STR_C2: return "REG_STR_C2";
case Icode_REG_STR_C3: return "REG_STR_C3";
case Icode_REG_STR1: return "LOAD_STR1";
case Icode_REG_STR2: return "LOAD_STR2";
case Icode_REG_STR4: return "LOAD_STR4";
case Icode_GETVAR1: return "GETVAR1";
case Icode_SETVAR1: return "SETVAR1";
case Icode_UNDEF: return "UNDEF";
case Icode_ZERO: return "ZERO";
case Icode_ONE: return "ONE";
case Icode_ENTERDQ: return "ENTERDQ";
case Icode_LEAVEDQ: return "LEAVEDQ";
case Icode_TAIL_CALL: return "TAIL_CALL";
case Icode_LOCAL_CLEAR: return "LOCAL_CLEAR";
case Icode_LITERAL_GETTER: return "LITERAL_GETTER";
case Icode_LITERAL_SETTER: return "LITERAL_SETTER";
case Icode_SETCONST: return "SETCONST";
case Icode_SETCONSTVAR: return "SETCONSTVAR";
case Icode_SETCONSTVAR1: return "SETCONSTVAR1";
case Icode_GENERATOR: return "GENERATOR";
case Icode_GENERATOR_END: return "GENERATOR_END";
case Icode_DEBUGGER: return "DEBUGGER";
}
// icode without name
throw new IllegalStateException(String.valueOf(bytecode));
}
private static boolean validIcode(int icode)
{
return MIN_ICODE <= icode && icode <= -1;
}
private static boolean validTokenCode(int token)
{
return Token.FIRST_BYTECODE_TOKEN <= token
&& token <= Token.LAST_BYTECODE_TOKEN;
}
private static boolean validBytecode(int bytecode)
{
return validIcode(bytecode) || validTokenCode(bytecode);
}
public Object compile(CompilerEnvirons compilerEnv,
ScriptOrFnNode tree,
String encodedSource,
boolean returnFunction)
{
this.compilerEnv = compilerEnv;
new NodeTransformer().transform(tree);
if (Token.printTrees) {
System.out.println(tree.toStringTree(tree));
}
if (returnFunction) {
tree = tree.getFunctionNode(0);
}
scriptOrFn = tree;
itsData = new InterpreterData(compilerEnv.getLanguageVersion(),
scriptOrFn.getSourceName(),
encodedSource);
itsData.topLevel = true;
if (returnFunction) {
generateFunctionICode();
} else {
generateICodeFromTree(scriptOrFn);
}
return itsData;
}
public Script createScriptObject(Object bytecode, Object staticSecurityDomain)
{
if(bytecode != itsData)
{
Kit.codeBug();
}
return InterpretedFunction.createScript(itsData,
staticSecurityDomain);
}
public void setEvalScriptFlag(Script script) {
((InterpretedFunction)script).idata.evalScriptFlag = true;
}
public Function createFunctionObject(Context cx, Scriptable scope,
Object bytecode, Object staticSecurityDomain)
{
if(bytecode != itsData)
{
Kit.codeBug();
}
return InterpretedFunction.createFunction(cx, scope, itsData,
staticSecurityDomain);
}
private void generateFunctionICode()
{
itsInFunctionFlag = true;
FunctionNode theFunction = (FunctionNode)scriptOrFn;
itsData.itsFunctionType = theFunction.getFunctionType();
itsData.itsNeedsActivation = theFunction.requiresActivation();
itsData.itsName = theFunction.getFunctionName();
if (!theFunction.getIgnoreDynamicScope()) {
if (compilerEnv.isUseDynamicScope()) {
itsData.useDynamicScope = true;
}
}
if (theFunction.isGenerator()) {
addIcode(Icode_GENERATOR);
addUint16(theFunction.getBaseLineno() & 0xFFFF);
}
generateICodeFromTree(theFunction.getLastChild());
}
private void generateICodeFromTree(Node tree)
{
generateNestedFunctions();
generateRegExpLiterals();
visitStatement(tree, 0);
fixLabelGotos();
// add RETURN_RESULT only to scripts as function always ends with RETURN
if (itsData.itsFunctionType == 0) {
addToken(Token.RETURN_RESULT);
}
if (itsData.itsICode.length != itsICodeTop) {
// Make itsData.itsICode length exactly itsICodeTop to save memory
// and catch bugs with jumps beyond icode as early as possible
byte[] tmp = new byte[itsICodeTop];
System.arraycopy(itsData.itsICode, 0, tmp, 0, itsICodeTop);
itsData.itsICode = tmp;
}
if (itsStrings.size() == 0) {
itsData.itsStringTable = null;
} else {
itsData.itsStringTable = new String[itsStrings.size()];
ObjToIntMap.Iterator iter = itsStrings.newIterator();
for (iter.start(); !iter.done(); iter.next()) {
String str = (String)iter.getKey();
int index = iter.getValue();
if (itsData.itsStringTable[index] != null) Kit.codeBug();
itsData.itsStringTable[index] = str;
}
}
if (itsDoubleTableTop == 0) {
itsData.itsDoubleTable = null;
} else if (itsData.itsDoubleTable.length != itsDoubleTableTop) {
double[] tmp = new double[itsDoubleTableTop];
System.arraycopy(itsData.itsDoubleTable, 0, tmp, 0,
itsDoubleTableTop);
itsData.itsDoubleTable = tmp;
}
if (itsExceptionTableTop != 0
&& itsData.itsExceptionTable.length != itsExceptionTableTop)
{
int[] tmp = new int[itsExceptionTableTop];
System.arraycopy(itsData.itsExceptionTable, 0, tmp, 0,
itsExceptionTableTop);
itsData.itsExceptionTable = tmp;
}
itsData.itsMaxVars = scriptOrFn.getParamAndVarCount();
// itsMaxFrameArray: interpret method needs this amount for its
// stack and sDbl arrays
itsData.itsMaxFrameArray = itsData.itsMaxVars
+ itsData.itsMaxLocals
+ itsData.itsMaxStack;
itsData.argNames = scriptOrFn.getParamAndVarNames();
itsData.argIsConst = scriptOrFn.getParamAndVarConst();
itsData.argCount = scriptOrFn.getParamCount();
itsData.encodedSourceStart = scriptOrFn.getEncodedSourceStart();
itsData.encodedSourceEnd = scriptOrFn.getEncodedSourceEnd();
if (itsLiteralIds.size() != 0) {
itsData.literalIds = itsLiteralIds.toArray();
}
if (Token.printICode) dumpICode(itsData);
}
private void generateNestedFunctions()
{
int functionCount = scriptOrFn.getFunctionCount();
if (functionCount == 0) return;
InterpreterData[] array = new InterpreterData[functionCount];
for (int i = 0; i != functionCount; i++) {
FunctionNode def = scriptOrFn.getFunctionNode(i);
Interpreter jsi = new Interpreter();
jsi.compilerEnv = compilerEnv;
jsi.scriptOrFn = def;
jsi.itsData = new InterpreterData(itsData);
jsi.generateFunctionICode();
array[i] = jsi.itsData;
}
itsData.itsNestedFunctions = array;
}
private void generateRegExpLiterals()
{
int N = scriptOrFn.getRegexpCount();
if (N == 0) return;
Context cx = Context.getContext();
RegExpProxy rep = ScriptRuntime.checkRegExpProxy(cx);
Object[] array = new Object[N];
for (int i = 0; i != N; i++) {
String string = scriptOrFn.getRegexpString(i);
String flags = scriptOrFn.getRegexpFlags(i);
array[i] = rep.compileRegExp(cx, string, flags);
}
itsData.itsRegExpLiterals = array;
}
private void updateLineNumber(Node node)
{
int lineno = node.getLineno();
if (lineno != itsLineNumber && lineno >= 0) {
if (itsData.firstLinePC < 0) {
itsData.firstLinePC = lineno;
}
itsLineNumber = lineno;
addIcode(Icode_LINE);
addUint16(lineno & 0xFFFF);
}
}
private RuntimeException badTree(Node node)
{
throw new RuntimeException(node.toString());
}
private void visitStatement(Node node, int initialStackDepth)
{
int type = node.getType();
Node child = node.getFirstChild();
switch (type) {
case Token.FUNCTION:
{
int fnIndex = node.getExistingIntProp(Node.FUNCTION_PROP);
int fnType = scriptOrFn.getFunctionNode(fnIndex).
getFunctionType();
// Only function expressions or function expression
// statements need closure code creating new function
// object on stack as function statements are initialized
// at script/function start.
// In addition, function expressions can not be present here
// at statement level, they must only be present as expressions.
if (fnType == FunctionNode.FUNCTION_EXPRESSION_STATEMENT) {
addIndexOp(Icode_CLOSURE_STMT, fnIndex);
} else {
if (fnType != FunctionNode.FUNCTION_STATEMENT) {
throw Kit.codeBug();
}
}
// For function statements or function expression statements
// in scripts, we need to ensure that the result of the script
// is the function if it is the last statement in the script.
// For example, eval("function () {}") should return a
// function, not undefined.
if (!itsInFunctionFlag) {
addIndexOp(Icode_CLOSURE_EXPR, fnIndex);
stackChange(1);
addIcode(Icode_POP_RESULT);
stackChange(-1);
}
}
break;
case Token.LABEL:
case Token.LOOP:
case Token.BLOCK:
case Token.EMPTY:
case Token.WITH:
updateLineNumber(node);
case Token.SCRIPT:
// fall through
while (child != null) {
visitStatement(child, initialStackDepth);
child = child.getNext();
}
break;
case Token.ENTERWITH:
visitExpression(child, 0);
addToken(Token.ENTERWITH);
stackChange(-1);
break;
case Token.LEAVEWITH:
addToken(Token.LEAVEWITH);
break;
case Token.LOCAL_BLOCK:
{
int local = allocLocal();
node.putIntProp(Node.LOCAL_PROP, local);
updateLineNumber(node);
while (child != null) {
visitStatement(child, initialStackDepth);
child = child.getNext();
}
addIndexOp(Icode_LOCAL_CLEAR, local);
releaseLocal(local);
}
break;
case Token.DEBUGGER:
addIcode(Icode_DEBUGGER);
break;
case Token.SWITCH:
updateLineNumber(node);
// See comments in IRFactory.createSwitch() for description
// of SWITCH node
{
visitExpression(child, 0);
for (Node.Jump caseNode = (Node.Jump)child.getNext();
caseNode != null;
caseNode = (Node.Jump)caseNode.getNext())
{
if (caseNode.getType() != Token.CASE)
throw badTree(caseNode);
Node test = caseNode.getFirstChild();
addIcode(Icode_DUP);
stackChange(1);
visitExpression(test, 0);
addToken(Token.SHEQ);
stackChange(-1);
// If true, Icode_IFEQ_POP will jump and remove case
// value from stack
addGoto(caseNode.target, Icode_IFEQ_POP);
stackChange(-1);
}
addIcode(Icode_POP);
stackChange(-1);
}
break;
case Token.TARGET:
markTargetLabel(node);
break;
case Token.IFEQ :
case Token.IFNE :
{
Node target = ((Node.Jump)node).target;
visitExpression(child, 0);
addGoto(target, type);
stackChange(-1);
}
break;
case Token.GOTO:
{
Node target = ((Node.Jump)node).target;
addGoto(target, type);
}
break;
case Token.JSR:
{
Node target = ((Node.Jump)node).target;
addGoto(target, Icode_GOSUB);
}
break;
case Token.FINALLY:
{
// Account for incomming GOTOSUB address
stackChange(1);
int finallyRegister = getLocalBlockRef(node);
addIndexOp(Icode_STARTSUB, finallyRegister);
stackChange(-1);
while (child != null) {
visitStatement(child, initialStackDepth);
child = child.getNext();
}
addIndexOp(Icode_RETSUB, finallyRegister);
}
break;
case Token.EXPR_VOID:
case Token.EXPR_RESULT:
updateLineNumber(node);
visitExpression(child, 0);
addIcode((type == Token.EXPR_VOID) ? Icode_POP : Icode_POP_RESULT);
stackChange(-1);
break;
case Token.TRY:
{
Node.Jump tryNode = (Node.Jump)node;
int exceptionObjectLocal = getLocalBlockRef(tryNode);
int scopeLocal = allocLocal();
addIndexOp(Icode_SCOPE_SAVE, scopeLocal);
int tryStart = itsICodeTop;
boolean savedFlag = itsInTryFlag;
itsInTryFlag = true;
while (child != null) {
visitStatement(child, initialStackDepth);
child = child.getNext();
}
itsInTryFlag = savedFlag;
Node catchTarget = tryNode.target;
if (catchTarget != null) {
int catchStartPC
= itsLabelTable[getTargetLabel(catchTarget)];
addExceptionHandler(
tryStart, catchStartPC, catchStartPC,
false, exceptionObjectLocal, scopeLocal);
}
Node finallyTarget = tryNode.getFinally();
if (finallyTarget != null) {
int finallyStartPC
= itsLabelTable[getTargetLabel(finallyTarget)];
addExceptionHandler(
tryStart, finallyStartPC, finallyStartPC,
true, exceptionObjectLocal, scopeLocal);
}
addIndexOp(Icode_LOCAL_CLEAR, scopeLocal);
releaseLocal(scopeLocal);
}
break;
case Token.CATCH_SCOPE:
{
int localIndex = getLocalBlockRef(node);
int scopeIndex = node.getExistingIntProp(Node.CATCH_SCOPE_PROP);
String name = child.getString();
child = child.getNext();
visitExpression(child, 0); // load expression object
addStringPrefix(name);
addIndexPrefix(localIndex);
addToken(Token.CATCH_SCOPE);
addUint8(scopeIndex != 0 ? 1 : 0);
stackChange(-1);
}
break;
case Token.THROW:
updateLineNumber(node);
visitExpression(child, 0);
addToken(Token.THROW);
addUint16(itsLineNumber & 0xFFFF);
stackChange(-1);
break;
case Token.RETHROW:
updateLineNumber(node);
addIndexOp(Token.RETHROW, getLocalBlockRef(node));
break;
case Token.RETURN:
updateLineNumber(node);
if (node.getIntProp(Node.GENERATOR_END_PROP, 0) != 0) {
// We're in a generator, so change RETURN to GENERATOR_END
addIcode(Icode_GENERATOR_END);
addUint16(itsLineNumber & 0xFFFF);
} else if (child != null) {
visitExpression(child, ECF_TAIL);
addToken(Token.RETURN);
stackChange(-1);
} else {
addIcode(Icode_RETUNDEF);
}
break;
case Token.RETURN_RESULT:
updateLineNumber(node);
addToken(Token.RETURN_RESULT);
break;
case Token.ENUM_INIT_KEYS:
case Token.ENUM_INIT_VALUES:
case Token.ENUM_INIT_ARRAY:
visitExpression(child, 0);
addIndexOp(type, getLocalBlockRef(node));
stackChange(-1);
break;
case Icode_GENERATOR:
break;
default:
throw badTree(node);
}
if (itsStackDepth != initialStackDepth) {
throw Kit.codeBug();
}
}
private void visitExpression(Node node, int contextFlags)
{
int type = node.getType();
Node child = node.getFirstChild();
int savedStackDepth = itsStackDepth;
switch (type) {
case Token.FUNCTION:
{
int fnIndex = node.getExistingIntProp(Node.FUNCTION_PROP);
FunctionNode fn = scriptOrFn.getFunctionNode(fnIndex);
// See comments in visitStatement for Token.FUNCTION case
if (fn.getFunctionType() != FunctionNode.FUNCTION_EXPRESSION) {
throw Kit.codeBug();
}
addIndexOp(Icode_CLOSURE_EXPR, fnIndex);
stackChange(1);
}
break;
case Token.LOCAL_LOAD:
{
int localIndex = getLocalBlockRef(node);
addIndexOp(Token.LOCAL_LOAD, localIndex);
stackChange(1);
}
break;
case Token.COMMA:
{
Node lastChild = node.getLastChild();
while (child != lastChild) {
visitExpression(child, 0);
addIcode(Icode_POP);
stackChange(-1);
child = child.getNext();
}
// Preserve tail context flag if any
visitExpression(child, contextFlags & ECF_TAIL);
}
break;
case Token.USE_STACK:
// Indicates that stack was modified externally,
// like placed catch object
stackChange(1);
break;
case Token.REF_CALL:
case Token.CALL:
case Token.NEW:
{
if (type == Token.NEW) {
visitExpression(child, 0);
} else {
generateCallFunAndThis(child);
}
int argCount = 0;
while ((child = child.getNext()) != null) {
visitExpression(child, 0);
++argCount;
}
int callType = node.getIntProp(Node.SPECIALCALL_PROP,
Node.NON_SPECIALCALL);
if (callType != Node.NON_SPECIALCALL) {
// embed line number and source filename
addIndexOp(Icode_CALLSPECIAL, argCount);
addUint8(callType);
addUint8(type == Token.NEW ? 1 : 0);
addUint16(itsLineNumber & 0xFFFF);
} else {
// Only use the tail call optimization if we're not in a try
// or we're not generating debug info (since the
// optimization will confuse the debugger)
if (type == Token.CALL && (contextFlags & ECF_TAIL) != 0 &&
!compilerEnv.isGenerateDebugInfo() && !itsInTryFlag)
{
type = Icode_TAIL_CALL;
}
addIndexOp(type, argCount);
}
// adjust stack
if (type == Token.NEW) {
// new: f, args -> result
stackChange(-argCount);
} else {
// call: f, thisObj, args -> result
// ref_call: f, thisObj, args -> ref
stackChange(-1 - argCount);
}
if (argCount > itsData.itsMaxCalleeArgs) {
itsData.itsMaxCalleeArgs = argCount;
}
}
break;
case Token.AND:
case Token.OR:
{
visitExpression(child, 0);
addIcode(Icode_DUP);
stackChange(1);
int afterSecondJumpStart = itsICodeTop;
int jump = (type == Token.AND) ? Token.IFNE : Token.IFEQ;
addGotoOp(jump);
stackChange(-1);
addIcode(Icode_POP);
stackChange(-1);
child = child.getNext();
// Preserve tail context flag if any
visitExpression(child, contextFlags & ECF_TAIL);
resolveForwardGoto(afterSecondJumpStart);
}
break;
case Token.HOOK:
{
Node ifThen = child.getNext();
Node ifElse = ifThen.getNext();
visitExpression(child, 0);
int elseJumpStart = itsICodeTop;
addGotoOp(Token.IFNE);
stackChange(-1);
// Preserve tail context flag if any
visitExpression(ifThen, contextFlags & ECF_TAIL);
int afterElseJumpStart = itsICodeTop;
addGotoOp(Token.GOTO);
resolveForwardGoto(elseJumpStart);
itsStackDepth = savedStackDepth;
// Preserve tail context flag if any
visitExpression(ifElse, contextFlags & ECF_TAIL);
resolveForwardGoto(afterElseJumpStart);
}
break;
case Token.GETPROP:
case Token.GETPROPNOWARN:
visitExpression(child, 0);
child = child.getNext();
addStringOp(type, child.getString());
break;
case Token.GETELEM:
case Token.DELPROP:
case Token.BITAND:
case Token.BITOR:
case Token.BITXOR:
case Token.LSH:
case Token.RSH:
case Token.URSH:
case Token.ADD:
case Token.SUB:
case Token.MOD:
case Token.DIV:
case Token.MUL:
case Token.EQ:
case Token.NE:
case Token.SHEQ:
case Token.SHNE:
case Token.IN:
case Token.INSTANCEOF:
case Token.LE:
case Token.LT:
case Token.GE:
case Token.GT:
visitExpression(child, 0);
child = child.getNext();
visitExpression(child, 0);
addToken(type);
stackChange(-1);
break;
case Token.POS:
case Token.NEG:
case Token.NOT:
case Token.BITNOT:
case Token.TYPEOF:
case Token.VOID:
visitExpression(child, 0);
if (type == Token.VOID) {
addIcode(Icode_POP);
addIcode(Icode_UNDEF);
} else {
addToken(type);
}
break;
case Token.GET_REF:
case Token.DEL_REF:
visitExpression(child, 0);
addToken(type);
break;
case Token.SETPROP:
case Token.SETPROP_OP:
{
visitExpression(child, 0);
child = child.getNext();
String property = child.getString();
child = child.getNext();
if (type == Token.SETPROP_OP) {
addIcode(Icode_DUP);
stackChange(1);
addStringOp(Token.GETPROP, property);
// Compensate for the following USE_STACK
stackChange(-1);
}
visitExpression(child, 0);
addStringOp(Token.SETPROP, property);
stackChange(-1);
}
break;
case Token.SETELEM:
case Token.SETELEM_OP:
visitExpression(child, 0);
child = child.getNext();
visitExpression(child, 0);
child = child.getNext();
if (type == Token.SETELEM_OP) {
addIcode(Icode_DUP2);
stackChange(2);
addToken(Token.GETELEM);
stackChange(-1);
// Compensate for the following USE_STACK
stackChange(-1);
}
visitExpression(child, 0);
addToken(Token.SETELEM);
stackChange(-2);
break;
case Token.SET_REF:
case Token.SET_REF_OP:
visitExpression(child, 0);
child = child.getNext();
if (type == Token.SET_REF_OP) {
addIcode(Icode_DUP);
stackChange(1);
addToken(Token.GET_REF);
// Compensate for the following USE_STACK
stackChange(-1);
}
visitExpression(child, 0);
addToken(Token.SET_REF);
stackChange(-1);
break;
case Token.SETNAME:
{
String name = child.getString();
visitExpression(child, 0);
child = child.getNext();
visitExpression(child, 0);
addStringOp(Token.SETNAME, name);
stackChange(-1);
}
break;
case Token.SETCONST:
{
String name = child.getString();
visitExpression(child, 0);
child = child.getNext();
visitExpression(child, 0);
addStringOp(Icode_SETCONST, name);
stackChange(-1);
}
break;
case Token.TYPEOFNAME:
{
int index = -1;
// use typeofname if an activation frame exists
// since the vars all exist there instead of in jregs
if (itsInFunctionFlag && !itsData.itsNeedsActivation)
index = scriptOrFn.getIndexForNameNode(node);
if (index == -1) {
addStringOp(Icode_TYPEOFNAME, node.getString());
stackChange(1);
} else {
addVarOp(Token.GETVAR, index);
stackChange(1);
addToken(Token.TYPEOF);
}
}
break;
case Token.BINDNAME:
case Token.NAME:
case Token.STRING:
addStringOp(type, node.getString());
stackChange(1);
break;
case Token.INC:
case Token.DEC:
visitIncDec(node, child);
break;
case Token.NUMBER:
{
double num = node.getDouble();
int inum = (int)num;
if (inum == num) {
if (inum == 0) {
addIcode(Icode_ZERO);
// Check for negative zero
if (1.0 / num < 0.0) {
addToken(Token.NEG);
}
} else if (inum == 1) {
addIcode(Icode_ONE);
} else if ((short)inum == inum) {
addIcode(Icode_SHORTNUMBER);
// write short as uin16 bit pattern
addUint16(inum & 0xFFFF);
} else {
addIcode(Icode_INTNUMBER);
addInt(inum);
}
} else {
int index = getDoubleIndex(num);
addIndexOp(Token.NUMBER, index);
}
stackChange(1);
}
break;
case Token.GETVAR:
{
if (itsData.itsNeedsActivation) Kit.codeBug();
int index = scriptOrFn.getIndexForNameNode(node);
addVarOp(Token.GETVAR, index);
stackChange(1);
}
break;
case Token.SETVAR:
{
if (itsData.itsNeedsActivation) Kit.codeBug();
int index = scriptOrFn.getIndexForNameNode(child);
child = child.getNext();
visitExpression(child, 0);
addVarOp(Token.SETVAR, index);
}
break;
case Token.SETCONSTVAR:
{
if (itsData.itsNeedsActivation) Kit.codeBug();
int index = scriptOrFn.getIndexForNameNode(child);
child = child.getNext();
visitExpression(child, 0);
addVarOp(Token.SETCONSTVAR, index);
}
break;
case Token.NULL:
case Token.THIS:
case Token.THISFN:
case Token.FALSE:
case Token.TRUE:
addToken(type);
stackChange(1);
break;
case Token.ENUM_NEXT:
case Token.ENUM_ID:
addIndexOp(type, getLocalBlockRef(node));
stackChange(1);
break;
case Token.REGEXP:
{
int index = node.getExistingIntProp(Node.REGEXP_PROP);
addIndexOp(Token.REGEXP, index);
stackChange(1);
}
break;
case Token.ARRAYLIT:
case Token.OBJECTLIT:
visitLiteral(node, child);
break;
case Token.ARRAYCOMP:
visitArrayComprehension(node, child, child.getNext());
break;
case Token.REF_SPECIAL:
visitExpression(child, 0);
addStringOp(type, (String)node.getProp(Node.NAME_PROP));
break;
case Token.REF_MEMBER:
case Token.REF_NS_MEMBER:
case Token.REF_NAME:
case Token.REF_NS_NAME:
{
int memberTypeFlags = node.getIntProp(Node.MEMBER_TYPE_PROP, 0);
// generate possible target, possible namespace and member
int childCount = 0;
do {
visitExpression(child, 0);
++childCount;
child = child.getNext();
} while (child != null);
addIndexOp(type, memberTypeFlags);
stackChange(1 - childCount);
}
break;
case Token.DOTQUERY:
{
int queryPC;
updateLineNumber(node);
visitExpression(child, 0);
addIcode(Icode_ENTERDQ);
stackChange(-1);
queryPC = itsICodeTop;
visitExpression(child.getNext(), 0);
addBackwardGoto(Icode_LEAVEDQ, queryPC);
}
break;
case Token.DEFAULTNAMESPACE :
case Token.ESCXMLATTR :
case Token.ESCXMLTEXT :
visitExpression(child, 0);
addToken(type);
break;
case Token.YIELD:
if (child != null) {
visitExpression(child, 0);
} else {
addIcode(Icode_UNDEF);
stackChange(1);
}
addToken(Token.YIELD);
addUint16(node.getLineno() & 0xFFFF);
break;
case Token.WITHEXPR: {
Node enterWith = node.getFirstChild();
Node with = enterWith.getNext();
visitExpression(enterWith.getFirstChild(), 0);
addToken(Token.ENTERWITH);
stackChange(-1);
visitExpression(with.getFirstChild(), 0);
addToken(Token.LEAVEWITH);
break;
}
default:
throw badTree(node);
}
if (savedStackDepth + 1 != itsStackDepth) {
Kit.codeBug();
}
}
private void generateCallFunAndThis(Node left)
{
// Generate code to place on stack function and thisObj
int type = left.getType();
switch (type) {
case Token.NAME: {
String name = left.getString();
// stack: ... -> ... function thisObj
addStringOp(Icode_NAME_AND_THIS, name);
stackChange(2);
break;
}
case Token.GETPROP:
case Token.GETELEM: {
Node target = left.getFirstChild();
visitExpression(target, 0);
Node id = target.getNext();
if (type == Token.GETPROP) {
String property = id.getString();
// stack: ... target -> ... function thisObj
addStringOp(Icode_PROP_AND_THIS, property);
stackChange(1);
} else {
visitExpression(id, 0);
// stack: ... target id -> ... function thisObj
addIcode(Icode_ELEM_AND_THIS);
}
break;
}
default:
// Including Token.GETVAR
visitExpression(left, 0);
// stack: ... value -> ... function thisObj
addIcode(Icode_VALUE_AND_THIS);
stackChange(1);
break;
}
}
private void visitIncDec(Node node, Node child)
{
int incrDecrMask = node.getExistingIntProp(Node.INCRDECR_PROP);
int childType = child.getType();
switch (childType) {
case Token.GETVAR : {
if (itsData.itsNeedsActivation) Kit.codeBug();
int i = scriptOrFn.getIndexForNameNode(child);
addVarOp(Icode_VAR_INC_DEC, i);
addUint8(incrDecrMask);
stackChange(1);
break;
}
case Token.NAME : {
String name = child.getString();
addStringOp(Icode_NAME_INC_DEC, name);
addUint8(incrDecrMask);
stackChange(1);
break;
}
case Token.GETPROP : {
Node object = child.getFirstChild();
visitExpression(object, 0);
String property = object.getNext().getString();
addStringOp(Icode_PROP_INC_DEC, property);
addUint8(incrDecrMask);
break;
}
case Token.GETELEM : {
Node object = child.getFirstChild();
visitExpression(object, 0);
Node index = object.getNext();
visitExpression(index, 0);
addIcode(Icode_ELEM_INC_DEC);
addUint8(incrDecrMask);
stackChange(-1);
break;
}
case Token.GET_REF : {
Node ref = child.getFirstChild();
visitExpression(ref, 0);
addIcode(Icode_REF_INC_DEC);
addUint8(incrDecrMask);
break;
}
default : {
throw badTree(node);
}
}
}
private void visitLiteral(Node node, Node child)
{
int type = node.getType();
int count;
Object[] propertyIds = null;
if (type == Token.ARRAYLIT) {
count = 0;
for (Node n = child; n != null; n = n.getNext()) {
++count;
}
} else if (type == Token.OBJECTLIT) {
propertyIds = (Object[])node.getProp(Node.OBJECT_IDS_PROP);
count = propertyIds.length;
} else {
throw badTree(node);
}
addIndexOp(Icode_LITERAL_NEW, count);
stackChange(2);
while (child != null) {
int childType = child.getType();
if (childType == Token.GET) {
visitExpression(child.getFirstChild(), 0);
addIcode(Icode_LITERAL_GETTER);
} else if (childType == Token.SET) {
visitExpression(child.getFirstChild(), 0);
addIcode(Icode_LITERAL_SETTER);
} else {
visitExpression(child, 0);
addIcode(Icode_LITERAL_SET);
}
stackChange(-1);
child = child.getNext();
}
if (type == Token.ARRAYLIT) {
int[] skipIndexes = (int[])node.getProp(Node.SKIP_INDEXES_PROP);
if (skipIndexes == null) {
addToken(Token.ARRAYLIT);
} else {
int index = itsLiteralIds.size();
itsLiteralIds.add(skipIndexes);
addIndexOp(Icode_SPARE_ARRAYLIT, index);
}
} else {
int index = itsLiteralIds.size();
itsLiteralIds.add(propertyIds);
addIndexOp(Token.OBJECTLIT, index);
}
stackChange(-1);
}
private void visitArrayComprehension(Node node, Node initStmt, Node expr)
{
// A bit of a hack: array comprehensions are implemented using
// statement nodes for the iteration, yet they appear in an
// expression context. So we pass the current stack depth to
// visitStatement so it can check that the depth is not altered
// by statements.
visitStatement(initStmt, itsStackDepth);
visitExpression(expr, 0);
}
private int getLocalBlockRef(Node node)
{
Node localBlock = (Node)node.getProp(Node.LOCAL_BLOCK_PROP);
return localBlock.getExistingIntProp(Node.LOCAL_PROP);
}
private int getTargetLabel(Node target)
{
int label = target.labelId();
if (label != -1) {
return label;
}
label = itsLabelTableTop;
if (itsLabelTable == null || label == itsLabelTable.length) {
if (itsLabelTable == null) {
itsLabelTable = new int[MIN_LABEL_TABLE_SIZE];
}else {
int[] tmp = new int[itsLabelTable.length * 2];
System.arraycopy(itsLabelTable, 0, tmp, 0, label);
itsLabelTable = tmp;
}
}
itsLabelTableTop = label + 1;
itsLabelTable[label] = -1;
target.labelId(label);
return label;
}
private void markTargetLabel(Node target)
{
int label = getTargetLabel(target);
if (itsLabelTable[label] != -1) {
// Can mark label only once
Kit.codeBug();
}
itsLabelTable[label] = itsICodeTop;
}
private void addGoto(Node target, int gotoOp)
{
int label = getTargetLabel(target);
if (!(label < itsLabelTableTop)) Kit.codeBug();
int targetPC = itsLabelTable[label];
if (targetPC != -1) {
addBackwardGoto(gotoOp, targetPC);
} else {
int gotoPC = itsICodeTop;
addGotoOp(gotoOp);
int top = itsFixupTableTop;
if (itsFixupTable == null || top == itsFixupTable.length) {
if (itsFixupTable == null) {
itsFixupTable = new long[MIN_FIXUP_TABLE_SIZE];
} else {
long[] tmp = new long[itsFixupTable.length * 2];
System.arraycopy(itsFixupTable, 0, tmp, 0, top);
itsFixupTable = tmp;
}
}
itsFixupTableTop = top + 1;
itsFixupTable[top] = ((long)label << 32) | gotoPC;
}
}
private void fixLabelGotos()
{
for (int i = 0; i < itsFixupTableTop; i++) {
long fixup = itsFixupTable[i];
int label = (int)(fixup >> 32);
int jumpSource = (int)fixup;
int pc = itsLabelTable[label];
if (pc == -1) {
// Unlocated label
throw Kit.codeBug();
}
resolveGoto(jumpSource, pc);
}
itsFixupTableTop = 0;
}
private void addBackwardGoto(int gotoOp, int jumpPC)
{
int fromPC = itsICodeTop;
// Ensure that this is a jump backward
if (fromPC <= jumpPC) throw Kit.codeBug();
addGotoOp(gotoOp);
resolveGoto(fromPC, jumpPC);
}
private void resolveForwardGoto(int fromPC)
{
// Ensure that forward jump skips at least self bytecode
if (itsICodeTop < fromPC + 3) throw Kit.codeBug();
resolveGoto(fromPC, itsICodeTop);
}
private void resolveGoto(int fromPC, int jumpPC)
{
int offset = jumpPC - fromPC;
// Ensure that jumps do not overlap
if (0 <= offset && offset <= 2) throw Kit.codeBug();
int offsetSite = fromPC + 1;
if (offset != (short)offset) {
if (itsData.longJumps == null) {
itsData.longJumps = new UintMap();
}
itsData.longJumps.put(offsetSite, jumpPC);
offset = 0;
}
byte[] array = itsData.itsICode;
array[offsetSite] = (byte)(offset >> 8);
array[offsetSite + 1] = (byte)offset;
}
private void addToken(int token)
{
if (!validTokenCode(token)) throw Kit.codeBug();
addUint8(token);
}
private void addIcode(int icode)
{
if (!validIcode(icode)) throw Kit.codeBug();
// Write negative icode as uint8 bits
addUint8(icode & 0xFF);
}
private void addUint8(int value)
{
if ((value & ~0xFF) != 0) throw Kit.codeBug();
byte[] array = itsData.itsICode;
int top = itsICodeTop;
if (top == array.length) {
array = increaseICodeCapacity(1);
}
array[top] = (byte)value;
itsICodeTop = top + 1;
}
private void addUint16(int value)
{
if ((value & ~0xFFFF) != 0) throw Kit.codeBug();
byte[] array = itsData.itsICode;
int top = itsICodeTop;
if (top + 2 > array.length) {
array = increaseICodeCapacity(2);
}
array[top] = (byte)(value >>> 8);
array[top + 1] = (byte)value;
itsICodeTop = top + 2;
}
private void addInt(int i)
{
byte[] array = itsData.itsICode;
int top = itsICodeTop;
if (top + 4 > array.length) {
array = increaseICodeCapacity(4);
}
array[top] = (byte)(i >>> 24);
array[top + 1] = (byte)(i >>> 16);
array[top + 2] = (byte)(i >>> 8);
array[top + 3] = (byte)i;
itsICodeTop = top + 4;
}
private int getDoubleIndex(double num)
{
int index = itsDoubleTableTop;
if (index == 0) {
itsData.itsDoubleTable = new double[64];
} else if (itsData.itsDoubleTable.length == index) {
double[] na = new double[index * 2];
System.arraycopy(itsData.itsDoubleTable, 0, na, 0, index);
itsData.itsDoubleTable = na;
}
itsData.itsDoubleTable[index] = num;
itsDoubleTableTop = index + 1;
return index;
}
private void addGotoOp(int gotoOp)
{
byte[] array = itsData.itsICode;
int top = itsICodeTop;
if (top + 3 > array.length) {
array = increaseICodeCapacity(3);
}
array[top] = (byte)gotoOp;
// Offset would written later
itsICodeTop = top + 1 + 2;
}
private void addVarOp(int op, int varIndex)
{
switch (op) {
case Token.SETCONSTVAR:
if (varIndex < 128) {
addIcode(Icode_SETCONSTVAR1);
addUint8(varIndex);
return;
}
addIndexOp(Icode_SETCONSTVAR, varIndex);
return;
case Token.GETVAR:
case Token.SETVAR:
if (varIndex < 128) {
addIcode(op == Token.GETVAR ? Icode_GETVAR1 : Icode_SETVAR1);
addUint8(varIndex);
return;
}
// fallthrough
case Icode_VAR_INC_DEC:
addIndexOp(op, varIndex);
return;
}
throw Kit.codeBug();
}
private void addStringOp(int op, String str)
{
addStringPrefix(str);
if (validIcode(op)) {
addIcode(op);
} else {
addToken(op);
}
}
private void addIndexOp(int op, int index)
{
addIndexPrefix(index);
if (validIcode(op)) {
addIcode(op);
} else {
addToken(op);
}
}
private void addStringPrefix(String str)
{
int index = itsStrings.get(str, -1);
if (index == -1) {
index = itsStrings.size();
itsStrings.put(str, index);
}
if (index < 4) {
addIcode(Icode_REG_STR_C0 - index);
} else if (index <= 0xFF) {
addIcode(Icode_REG_STR1);
addUint8(index);
} else if (index <= 0xFFFF) {
addIcode(Icode_REG_STR2);
addUint16(index);
} else {
addIcode(Icode_REG_STR4);
addInt(index);
}
}
private void addIndexPrefix(int index)
{
if (index < 0) Kit.codeBug();
if (index < 6) {
addIcode(Icode_REG_IND_C0 - index);
} else if (index <= 0xFF) {
addIcode(Icode_REG_IND1);
addUint8(index);
} else if (index <= 0xFFFF) {
addIcode(Icode_REG_IND2);
addUint16(index);
} else {
addIcode(Icode_REG_IND4);
addInt(index);
}
}
private void addExceptionHandler(int icodeStart, int icodeEnd,
int handlerStart, boolean isFinally,
int exceptionObjectLocal, int scopeLocal)
{
int top = itsExceptionTableTop;
int[] table = itsData.itsExceptionTable;
if (table == null) {
if (top != 0) Kit.codeBug();
table = new int[EXCEPTION_SLOT_SIZE * 2];
itsData.itsExceptionTable = table;
} else if (table.length == top) {
table = new int[table.length * 2];
System.arraycopy(itsData.itsExceptionTable, 0, table, 0, top);
itsData.itsExceptionTable = table;
}
table[top + EXCEPTION_TRY_START_SLOT] = icodeStart;
table[top + EXCEPTION_TRY_END_SLOT] = icodeEnd;
table[top + EXCEPTION_HANDLER_SLOT] = handlerStart;
table[top + EXCEPTION_TYPE_SLOT] = isFinally ? 1 : 0;
table[top + EXCEPTION_LOCAL_SLOT] = exceptionObjectLocal;
table[top + EXCEPTION_SCOPE_SLOT] = scopeLocal;
itsExceptionTableTop = top + EXCEPTION_SLOT_SIZE;
}
private byte[] increaseICodeCapacity(int extraSize)
{
int capacity = itsData.itsICode.length;
int top = itsICodeTop;
if (top + extraSize <= capacity) throw Kit.codeBug();
capacity *= 2;
if (top + extraSize > capacity) {
capacity = top + extraSize;
}
byte[] array = new byte[capacity];
System.arraycopy(itsData.itsICode, 0, array, 0, top);
itsData.itsICode = array;
return array;
}
private void stackChange(int change)
{
if (change <= 0) {
itsStackDepth += change;
} else {
int newDepth = itsStackDepth + change;
if (newDepth > itsData.itsMaxStack) {
itsData.itsMaxStack = newDepth;
}
itsStackDepth = newDepth;
}
}
private int allocLocal()
{
int localSlot = itsLocalTop;
++itsLocalTop;
if (itsLocalTop > itsData.itsMaxLocals) {
itsData.itsMaxLocals = itsLocalTop;
}
return localSlot;
}
private void releaseLocal(int localSlot)
{
--itsLocalTop;
if (localSlot != itsLocalTop) Kit.codeBug();
}
private static int getShort(byte[] iCode, int pc) {
return (iCode[pc] << 8) | (iCode[pc + 1] & 0xFF);
}
private static int getIndex(byte[] iCode, int pc) {
return ((iCode[pc] & 0xFF) << 8) | (iCode[pc + 1] & 0xFF);
}
private static int getInt(byte[] iCode, int pc) {
return (iCode[pc] << 24) | ((iCode[pc + 1] & 0xFF) << 16)
| ((iCode[pc + 2] & 0xFF) << 8) | (iCode[pc + 3] & 0xFF);
}
private static int getExceptionHandler(CallFrame frame,
boolean onlyFinally)
{
int[] exceptionTable = frame.idata.itsExceptionTable;
if (exceptionTable == null) {
// No exception handlers
return -1;
}
// Icode switch in the interpreter increments PC immediately
// and it is necessary to subtract 1 from the saved PC
// to point it before the start of the next instruction.
int pc = frame.pc - 1;
// OPT: use binary search
int best = -1, bestStart = 0, bestEnd = 0;
for (int i = 0; i != exceptionTable.length; i += EXCEPTION_SLOT_SIZE) {
int start = exceptionTable[i + EXCEPTION_TRY_START_SLOT];
int end = exceptionTable[i + EXCEPTION_TRY_END_SLOT];
if (!(start <= pc && pc < end)) {
continue;
}
if (onlyFinally && exceptionTable[i + EXCEPTION_TYPE_SLOT] != 1) {
continue;
}
if (best >= 0) {
// Since handlers always nest and they never have shared end
// although they can share start it is sufficient to compare
// handlers ends
if (bestEnd < end) {
continue;
}
// Check the above assumption
if (bestStart > start) Kit.codeBug(); // should be nested
if (bestEnd == end) Kit.codeBug(); // no ens sharing
}
best = i;
bestStart = start;
bestEnd = end;
}
return best;
}
private static void dumpICode(InterpreterData idata)
{
if (!Token.printICode) {
return;
}
byte iCode[] = idata.itsICode;
int iCodeLength = iCode.length;
String[] strings = idata.itsStringTable;
PrintStream out = System.out;
out.println("ICode dump, for " + idata.itsName
+ ", length = " + iCodeLength);
out.println("MaxStack = " + idata.itsMaxStack);
int indexReg = 0;
for (int pc = 0; pc < iCodeLength; ) {
out.flush();
out.print(" [" + pc + "] ");
int token = iCode[pc];
int icodeLength = bytecodeSpan(token);
String tname = bytecodeName(token);
int old_pc = pc;
++pc;
switch (token) {
default:
if (icodeLength != 1) Kit.codeBug();
out.println(tname);
break;
case Icode_GOSUB :
case Token.GOTO :
case Token.IFEQ :
case Token.IFNE :
case Icode_IFEQ_POP :
case Icode_LEAVEDQ : {
int newPC = pc + getShort(iCode, pc) - 1;
out.println(tname + " " + newPC);
pc += 2;
break;
}
case Icode_VAR_INC_DEC :
case Icode_NAME_INC_DEC :
case Icode_PROP_INC_DEC :
case Icode_ELEM_INC_DEC :
case Icode_REF_INC_DEC: {
int incrDecrType = iCode[pc];
out.println(tname + " " + incrDecrType);
++pc;
break;
}
case Icode_CALLSPECIAL : {
int callType = iCode[pc] & 0xFF;
boolean isNew = (iCode[pc + 1] != 0);
int line = getIndex(iCode, pc+2);
out.println(tname+" "+callType+" "+isNew+" "+indexReg+" "+line);
pc += 4;
break;
}
case Token.CATCH_SCOPE:
{
boolean afterFisrtFlag = (iCode[pc] != 0);
out.println(tname+" "+afterFisrtFlag);
++pc;
}
break;
case Token.REGEXP :
out.println(tname+" "+idata.itsRegExpLiterals[indexReg]);
break;
case Token.OBJECTLIT :
case Icode_SPARE_ARRAYLIT :
out.println(tname+" "+idata.literalIds[indexReg]);
break;
case Icode_CLOSURE_EXPR :
case Icode_CLOSURE_STMT :
out.println(tname+" "+idata.itsNestedFunctions[indexReg]);
break;
case Token.CALL :
case Icode_TAIL_CALL :
case Token.REF_CALL :
case Token.NEW :
out.println(tname+' '+indexReg);
break;
case Token.THROW :
case Token.YIELD :
case Icode_GENERATOR :
case Icode_GENERATOR_END :
{
int line = getIndex(iCode, pc);
out.println(tname + " : " + line);
pc += 2;
break;
}
case Icode_SHORTNUMBER : {
int value = getShort(iCode, pc);
out.println(tname + " " + value);
pc += 2;
break;
}
case Icode_INTNUMBER : {
int value = getInt(iCode, pc);
out.println(tname + " " + value);
pc += 4;
break;
}
case Token.NUMBER : {
double value = idata.itsDoubleTable[indexReg];
out.println(tname + " " + value);
break;
}
case Icode_LINE : {
int line = getIndex(iCode, pc);
out.println(tname + " : " + line);
pc += 2;
break;
}
case Icode_REG_STR1: {
String str = strings[0xFF & iCode[pc]];
out.println(tname + " \"" + str + '"');
++pc;
break;
}
case Icode_REG_STR2: {
String str = strings[getIndex(iCode, pc)];
out.println(tname + " \"" + str + '"');
pc += 2;
break;
}
case Icode_REG_STR4: {
String str = strings[getInt(iCode, pc)];
out.println(tname + " \"" + str + '"');
pc += 4;
break;
}
case Icode_REG_IND_C0:
indexReg = 0;
out.println(tname);
break;
case Icode_REG_IND_C1:
indexReg = 1;
out.println(tname);
break;
case Icode_REG_IND_C2:
indexReg = 2;
out.println(tname);
break;
case Icode_REG_IND_C3:
indexReg = 3;
out.println(tname);
break;
case Icode_REG_IND_C4:
indexReg = 4;
out.println(tname);
break;
case Icode_REG_IND_C5:
indexReg = 5;
out.println(tname);
break;
case Icode_REG_IND1: {
indexReg = 0xFF & iCode[pc];
out.println(tname+" "+indexReg);
++pc;
break;
}
case Icode_REG_IND2: {
indexReg = getIndex(iCode, pc);
out.println(tname+" "+indexReg);
pc += 2;
break;
}
case Icode_REG_IND4: {
indexReg = getInt(iCode, pc);
out.println(tname+" "+indexReg);
pc += 4;
break;
}
case Icode_GETVAR1:
case Icode_SETVAR1:
case Icode_SETCONSTVAR1:
indexReg = iCode[pc];
out.println(tname+" "+indexReg);
++pc;
break;
}
if (old_pc + icodeLength != pc) Kit.codeBug();
}
int[] table = idata.itsExceptionTable;
if (table != null) {
out.println("Exception handlers: "
+table.length / EXCEPTION_SLOT_SIZE);
for (int i = 0; i != table.length;
i += EXCEPTION_SLOT_SIZE)
{
int tryStart = table[i + EXCEPTION_TRY_START_SLOT];
int tryEnd = table[i + EXCEPTION_TRY_END_SLOT];
int handlerStart = table[i + EXCEPTION_HANDLER_SLOT];
int type = table[i + EXCEPTION_TYPE_SLOT];
int exceptionLocal = table[i + EXCEPTION_LOCAL_SLOT];
int scopeLocal = table[i + EXCEPTION_SCOPE_SLOT];
out.println(" tryStart="+tryStart+" tryEnd="+tryEnd
+" handlerStart="+handlerStart
+" type="+(type == 0 ? "catch" : "finally")
+" exceptionLocal="+exceptionLocal);
}
}
out.flush();
}
private static int bytecodeSpan(int bytecode)
{
switch (bytecode) {
case Token.THROW :
case Token.YIELD:
case Icode_GENERATOR:
case Icode_GENERATOR_END:
// source line
return 1 + 2;
case Icode_GOSUB :
case Token.GOTO :
case Token.IFEQ :
case Token.IFNE :
case Icode_IFEQ_POP :
case Icode_LEAVEDQ :
// target pc offset
return 1 + 2;
case Icode_CALLSPECIAL :
// call type
// is new
// line number
return 1 + 1 + 1 + 2;
case Token.CATCH_SCOPE:
// scope flag
return 1 + 1;
case Icode_VAR_INC_DEC:
case Icode_NAME_INC_DEC:
case Icode_PROP_INC_DEC:
case Icode_ELEM_INC_DEC:
case Icode_REF_INC_DEC:
// type of ++/--
return 1 + 1;
case Icode_SHORTNUMBER :
// short number
return 1 + 2;
case Icode_INTNUMBER :
// int number
return 1 + 4;
case Icode_REG_IND1:
// ubyte index
return 1 + 1;
case Icode_REG_IND2:
// ushort index
return 1 + 2;
case Icode_REG_IND4:
// int index
return 1 + 4;
case Icode_REG_STR1:
// ubyte string index
return 1 + 1;
case Icode_REG_STR2:
// ushort string index
return 1 + 2;
case Icode_REG_STR4:
// int string index
return 1 + 4;
case Icode_GETVAR1:
case Icode_SETVAR1:
case Icode_SETCONSTVAR1:
// byte var index
return 1 + 1;
case Icode_LINE :
// line number
return 1 + 2;
}
if (!validBytecode(bytecode)) throw Kit.codeBug();
return 1;
}
static int[] getLineNumbers(InterpreterData data)
{
UintMap presentLines = new UintMap();
byte[] iCode = data.itsICode;
int iCodeLength = iCode.length;
for (int pc = 0; pc != iCodeLength;) {
int bytecode = iCode[pc];
int span = bytecodeSpan(bytecode);
if (bytecode == Icode_LINE) {
if (span != 3) Kit.codeBug();
int line = getIndex(iCode, pc + 1);
presentLines.put(line, 0);
}
pc += span;
}
return presentLines.getKeys();
}
public void captureStackInfo(RhinoException ex)
{
Context cx = Context.getCurrentContext();
if (cx == null || cx.lastInterpreterFrame == null) {
// No interpreter invocations
ex.interpreterStackInfo = null;
ex.interpreterLineData = null;
return;
}
// has interpreter frame on the stack
CallFrame[] array;
if (cx.previousInterpreterInvocations == null
|| cx.previousInterpreterInvocations.size() == 0)
{
array = new CallFrame[1];
} else {
int previousCount = cx.previousInterpreterInvocations.size();
if (cx.previousInterpreterInvocations.peek()
== cx.lastInterpreterFrame)
{
// It can happen if exception was generated after
// frame was pushed to cx.previousInterpreterInvocations
// but before assignment to cx.lastInterpreterFrame.
// In this case frames has to be ignored.
--previousCount;
}
array = new CallFrame[previousCount + 1];
cx.previousInterpreterInvocations.toArray(array);
}
array[array.length - 1] = (CallFrame)cx.lastInterpreterFrame;
int interpreterFrameCount = 0;
for (int i = 0; i != array.length; ++i) {
interpreterFrameCount += 1 + array[i].frameIndex;
}
int[] linePC = new int[interpreterFrameCount];
// Fill linePC with pc positions from all interpreter frames.
// Start from the most nested frame
int linePCIndex = interpreterFrameCount;
for (int i = array.length; i != 0;) {
--i;
CallFrame frame = array[i];
while (frame != null) {
--linePCIndex;
linePC[linePCIndex] = frame.pcSourceLineStart;
frame = frame.parentFrame;
}
}
if (linePCIndex != 0) Kit.codeBug();
ex.interpreterStackInfo = array;
ex.interpreterLineData = linePC;
}
public String getSourcePositionFromStack(Context cx, int[] linep)
{
CallFrame frame = (CallFrame)cx.lastInterpreterFrame;
InterpreterData idata = frame.idata;
if (frame.pcSourceLineStart >= 0) {
linep[0] = getIndex(idata.itsICode, frame.pcSourceLineStart);
} else {
linep[0] = 0;
}
return idata.itsSourceFile;
}
public String getPatchedStack(RhinoException ex,
String nativeStackTrace)
{
String tag = "org.mozilla.javascript.Interpreter.interpretLoop";
StringBuffer sb = new StringBuffer(nativeStackTrace.length() + 1000);
String lineSeparator = SecurityUtilities.getSystemProperty("line.separator");
CallFrame[] array = (CallFrame[])ex.interpreterStackInfo;
int[] linePC = ex.interpreterLineData;
int arrayIndex = array.length;
int linePCIndex = linePC.length;
int offset = 0;
while (arrayIndex != 0) {
--arrayIndex;
int pos = nativeStackTrace.indexOf(tag, offset);
if (pos < 0) {
break;
}
// Skip tag length
pos += tag.length();
// Skip until the end of line
for (; pos != nativeStackTrace.length(); ++pos) {
char c = nativeStackTrace.charAt(pos);
if (c == '\n' || c == '\r') {
break;
}
}
sb.append(nativeStackTrace.substring(offset, pos));
offset = pos;
CallFrame frame = array[arrayIndex];
while (frame != null) {
if (linePCIndex == 0) Kit.codeBug();
--linePCIndex;
InterpreterData idata = frame.idata;
sb.append(lineSeparator);
sb.append("\tat script");
if (idata.itsName != null && idata.itsName.length() != 0) {
sb.append('.');
sb.append(idata.itsName);
}
sb.append('(');
sb.append(idata.itsSourceFile);
int pc = linePC[linePCIndex];
if (pc >= 0) {
// Include line info only if available
sb.append(':');
sb.append(getIndex(idata.itsICode, pc));
}
sb.append(')');
frame = frame.parentFrame;
}
}
sb.append(nativeStackTrace.substring(offset));
return sb.toString();
}
public List<String> getScriptStack(RhinoException ex)
{
if (ex.interpreterStackInfo == null) {
return null;
}
List<String> list = new ArrayList<String>();
String lineSeparator =
SecurityUtilities.getSystemProperty("line.separator");
CallFrame[] array = (CallFrame[])ex.interpreterStackInfo;
int[] linePC = ex.interpreterLineData;
int arrayIndex = array.length;
int linePCIndex = linePC.length;
while (arrayIndex != 0) {
--arrayIndex;
StringBuilder sb = new StringBuilder();
CallFrame frame = array[arrayIndex];
while (frame != null) {
if (linePCIndex == 0) Kit.codeBug();
--linePCIndex;
InterpreterData idata = frame.idata;
sb.append("\tat ");
sb.append(idata.itsSourceFile);
int pc = linePC[linePCIndex];
if (pc >= 0) {
// Include line info only if available
sb.append(':');
sb.append(getIndex(idata.itsICode, pc));
}
if (idata.itsName != null && idata.itsName.length() != 0) {
sb.append(" (");
sb.append(idata.itsName);
sb.append(')');
}
sb.append(lineSeparator);
frame = frame.parentFrame;
}
list.add(sb.toString());
}
return list;
}
static String getEncodedSource(InterpreterData idata)
{
if (idata.encodedSource == null) {
return null;
}
return idata.encodedSource.substring(idata.encodedSourceStart,
idata.encodedSourceEnd);
}
private static void initFunction(Context cx, Scriptable scope,
InterpretedFunction parent, int index)
{
InterpretedFunction fn;
fn = InterpretedFunction.createFunction(cx, scope, parent, index);
ScriptRuntime.initFunction(cx, scope, fn, fn.idata.itsFunctionType,
parent.idata.evalScriptFlag);
}
static Object interpret(InterpretedFunction ifun,
Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (!ScriptRuntime.hasTopCall(cx)) Kit.codeBug();
if (cx.interpreterSecurityDomain != ifun.securityDomain) {
Object savedDomain = cx.interpreterSecurityDomain;
cx.interpreterSecurityDomain = ifun.securityDomain;
try {
return ifun.securityController.callWithDomain(
ifun.securityDomain, cx, ifun, scope, thisObj, args);
} finally {
cx.interpreterSecurityDomain = savedDomain;
}
}
CallFrame frame = new CallFrame();
initFrame(cx, scope, thisObj, args, null, 0, args.length,
ifun, null, frame);
frame.isContinuationsTopFrame = cx.isContinuationsTopCall;
cx.isContinuationsTopCall = false;
return interpretLoop(cx, frame, null);
}
static class GeneratorState {
GeneratorState(int operation, Object value) {
this.operation = operation;
this.value = value;
}
int operation;
Object value;
RuntimeException returnedException;
}
public static Object resumeGenerator(Context cx,
Scriptable scope,
int operation,
Object savedState,
Object value)
{
CallFrame frame = (CallFrame) savedState;
GeneratorState generatorState = new GeneratorState(operation, value);
if (operation == NativeGenerator.GENERATOR_CLOSE) {
try {
return interpretLoop(cx, frame, generatorState);
} catch (RuntimeException e) {
// Only propagate exceptions other than closingException
if (e != value)
throw e;
}
return Undefined.instance;
}
Object result = interpretLoop(cx, frame, generatorState);
if (generatorState.returnedException != null)
throw generatorState.returnedException;
return result;
}
public static Object restartContinuation(NativeContinuation c, Context cx,
Scriptable scope, Object[] args)
{
if (!ScriptRuntime.hasTopCall(cx)) {
return ScriptRuntime.doTopCall(c, cx, scope, null, args);
}
Object arg;
if (args.length == 0) {
arg = Undefined.instance;
} else {
arg = args[0];
}
CallFrame capturedFrame = (CallFrame)c.getImplementation();
if (capturedFrame == null) {
// No frames to restart
return arg;
}
ContinuationJump cjump = new ContinuationJump(c, null);
cjump.result = arg;
return interpretLoop(cx, null, cjump);
}
private static Object interpretLoop(Context cx, CallFrame frame,
Object throwable)
{
// throwable holds exception object to rethrow or catch
// It is also used for continuation restart in which case
// it holds ContinuationJump
final Object DBL_MRK = UniqueTag.DOUBLE_MARK;
final Object undefined = Undefined.instance;
final boolean instructionCounting = (cx.instructionThreshold != 0);
// arbitrary number to add to instructionCount when calling
// other functions
final int INVOCATION_COST = 100;
// arbitrary exception cost for instruction counting
final int EXCEPTION_COST = 100;
String stringReg = null;
int indexReg = -1;
if (cx.lastInterpreterFrame != null) {
// save the top frame from the previous interpretLoop
// invocation on the stack
if (cx.previousInterpreterInvocations == null) {
cx.previousInterpreterInvocations = new ObjArray();
}
cx.previousInterpreterInvocations.push(cx.lastInterpreterFrame);
}
// When restarting continuation throwable is not null and to jump
// to the code that rewind continuation state indexReg should be set
// to -1.
// With the normal call throwable == null and indexReg == -1 allows to
// catch bugs with using indeReg to access array elements before
// initializing indexReg.
GeneratorState generatorState = null;
if (throwable != null) {
if (throwable instanceof GeneratorState) {
generatorState = (GeneratorState) throwable;
// reestablish this call frame
enterFrame(cx, frame, ScriptRuntime.emptyArgs, true);
throwable = null;
} else if (!(throwable instanceof ContinuationJump)) {
// It should be continuation
Kit.codeBug();
}
}
Object interpreterResult = null;
double interpreterResultDbl = 0.0;
StateLoop: for (;;) {
withoutExceptions: try {
if (throwable != null) {
// Need to return both 'frame' and 'throwable' from
// 'processThrowable', so just added a 'throwable'
// member in 'frame'.
frame = processThrowable(cx, throwable, frame, indexReg,
instructionCounting);
throwable = frame.throwable;
frame.throwable = null;
} else {
if (generatorState == null && frame.frozen) Kit.codeBug();
}
// Use local variables for constant values in frame
// for faster access
Object[] stack = frame.stack;
double[] sDbl = frame.sDbl;
Object[] vars = frame.varSource.stack;
double[] varDbls = frame.varSource.sDbl;
int[] varAttributes = frame.varSource.stackAttributes;
byte[] iCode = frame.idata.itsICode;
String[] strings = frame.idata.itsStringTable;
// Use local for stackTop as well. Since execption handlers
// can only exist at statement level where stack is empty,
// it is necessary to save/restore stackTop only across
// function calls and normal returns.
int stackTop = frame.savedStackTop;
// Store new frame in cx which is used for error reporting etc.
cx.lastInterpreterFrame = frame;
Loop: for (;;) {
// Exception handler assumes that PC is already incremented
// pass the instruction start when it searches the
// exception handler
int op = iCode[frame.pc++];
jumplessRun: {
// Back indent to ease implementation reading
switch (op) {
case Icode_GENERATOR: {
if (!frame.frozen) {
// First time encountering this opcode: create new generator
// object and return
frame.pc--; // we want to come back here when we resume
CallFrame generatorFrame = captureFrameForGenerator(frame);
generatorFrame.frozen = true;
NativeGenerator generator = new NativeGenerator(frame.scope,
generatorFrame.fnOrScript, generatorFrame);
frame.result = generator;
break Loop;
} else {
// We are now resuming execution. Fall through to YIELD case.
}
}
// fall through...
case Token.YIELD: {
if (!frame.frozen) {
return freezeGenerator(cx, frame, stackTop, generatorState);
} else {
Object obj = thawGenerator(frame, stackTop, generatorState, op);
if (obj != Scriptable.NOT_FOUND) {
throwable = obj;
break withoutExceptions;
}
continue Loop;
}
}
case Icode_GENERATOR_END: {
// throw StopIteration
frame.frozen = true;
int sourceLine = getIndex(iCode, frame.pc);
generatorState.returnedException = new JavaScriptException(
NativeIterator.getStopIterationObject(frame.scope),
frame.idata.itsSourceFile, sourceLine);
break Loop;
}
case Token.THROW: {
Object value = stack[stackTop];
if (value == DBL_MRK) value = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
int sourceLine = getIndex(iCode, frame.pc);
throwable = new JavaScriptException(value,
frame.idata.itsSourceFile,
sourceLine);
break withoutExceptions;
}
case Token.RETHROW: {
indexReg += frame.localShift;
throwable = stack[indexReg];
break withoutExceptions;
}
case Token.GE :
case Token.LE :
case Token.GT :
case Token.LT : {
--stackTop;
Object rhs = stack[stackTop + 1];
Object lhs = stack[stackTop];
boolean valBln;
object_compare:
{
number_compare:
{
double rDbl, lDbl;
if (rhs == DBL_MRK) {
rDbl = sDbl[stackTop + 1];
lDbl = stack_double(frame, stackTop);
} else if (lhs == DBL_MRK) {
rDbl = ScriptRuntime.toNumber(rhs);
lDbl = sDbl[stackTop];
} else {
break number_compare;
}
switch (op) {
case Token.GE:
valBln = (lDbl >= rDbl);
break object_compare;
case Token.LE:
valBln = (lDbl <= rDbl);
break object_compare;
case Token.GT:
valBln = (lDbl > rDbl);
break object_compare;
case Token.LT:
valBln = (lDbl < rDbl);
break object_compare;
default:
throw Kit.codeBug();
}
}
switch (op) {
case Token.GE:
valBln = ScriptRuntime.cmp_LE(rhs, lhs);
break;
case Token.LE:
valBln = ScriptRuntime.cmp_LE(lhs, rhs);
break;
case Token.GT:
valBln = ScriptRuntime.cmp_LT(rhs, lhs);
break;
case Token.LT:
valBln = ScriptRuntime.cmp_LT(lhs, rhs);
break;
default:
throw Kit.codeBug();
}
}
stack[stackTop] = ScriptRuntime.wrapBoolean(valBln);
continue Loop;
}
case Token.IN :
case Token.INSTANCEOF : {
Object rhs = stack[stackTop];
if (rhs == DBL_MRK) rhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
boolean valBln;
if (op == Token.IN) {
valBln = ScriptRuntime.in(lhs, rhs, cx);
} else {
valBln = ScriptRuntime.instanceOf(lhs, rhs, cx);
}
stack[stackTop] = ScriptRuntime.wrapBoolean(valBln);
continue Loop;
}
case Token.EQ :
case Token.NE : {
--stackTop;
boolean valBln;
Object rhs = stack[stackTop + 1];
Object lhs = stack[stackTop];
if (rhs == DBL_MRK) {
if (lhs == DBL_MRK) {
valBln = (sDbl[stackTop] == sDbl[stackTop + 1]);
} else {
valBln = ScriptRuntime.eqNumber(sDbl[stackTop + 1], lhs);
}
} else {
if (lhs == DBL_MRK) {
valBln = ScriptRuntime.eqNumber(sDbl[stackTop], rhs);
} else {
valBln = ScriptRuntime.eq(lhs, rhs);
}
}
valBln ^= (op == Token.NE);
stack[stackTop] = ScriptRuntime.wrapBoolean(valBln);
continue Loop;
}
case Token.SHEQ :
case Token.SHNE : {
--stackTop;
boolean valBln = shallowEquals(stack, sDbl, stackTop);
valBln ^= (op == Token.SHNE);
stack[stackTop] = ScriptRuntime.wrapBoolean(valBln);
continue Loop;
}
case Token.IFNE :
if (stack_boolean(frame, stackTop--)) {
frame.pc += 2;
continue Loop;
}
break jumplessRun;
case Token.IFEQ :
if (!stack_boolean(frame, stackTop--)) {
frame.pc += 2;
continue Loop;
}
break jumplessRun;
case Icode_IFEQ_POP :
if (!stack_boolean(frame, stackTop--)) {
frame.pc += 2;
continue Loop;
}
stack[stackTop--] = null;
break jumplessRun;
case Token.GOTO :
break jumplessRun;
case Icode_GOSUB :
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = frame.pc + 2;
break jumplessRun;
case Icode_STARTSUB :
if (stackTop == frame.emptyStackTop + 1) {
// Call from Icode_GOSUB: store return PC address in the local
indexReg += frame.localShift;
stack[indexReg] = stack[stackTop];
sDbl[indexReg] = sDbl[stackTop];
--stackTop;
} else {
// Call from exception handler: exception object is already stored
// in the local
if (stackTop != frame.emptyStackTop) Kit.codeBug();
}
continue Loop;
case Icode_RETSUB : {
// indexReg: local to store return address
if (instructionCounting) {
addInstructionCount(cx, frame, 0);
}
indexReg += frame.localShift;
Object value = stack[indexReg];
if (value != DBL_MRK) {
// Invocation from exception handler, restore object to rethrow
throwable = value;
break withoutExceptions;
}
// Normal return from GOSUB
frame.pc = (int)sDbl[indexReg];
if (instructionCounting) {
frame.pcPrevBranch = frame.pc;
}
continue Loop;
}
case Icode_POP :
stack[stackTop] = null;
stackTop--;
continue Loop;
case Icode_POP_RESULT :
frame.result = stack[stackTop];
frame.resultDbl = sDbl[stackTop];
stack[stackTop] = null;
--stackTop;
continue Loop;
case Icode_DUP :
stack[stackTop + 1] = stack[stackTop];
sDbl[stackTop + 1] = sDbl[stackTop];
stackTop++;
continue Loop;
case Icode_DUP2 :
stack[stackTop + 1] = stack[stackTop - 1];
sDbl[stackTop + 1] = sDbl[stackTop - 1];
stack[stackTop + 2] = stack[stackTop];
sDbl[stackTop + 2] = sDbl[stackTop];
stackTop += 2;
continue Loop;
case Icode_SWAP : {
Object o = stack[stackTop];
stack[stackTop] = stack[stackTop - 1];
stack[stackTop - 1] = o;
double d = sDbl[stackTop];
sDbl[stackTop] = sDbl[stackTop - 1];
sDbl[stackTop - 1] = d;
continue Loop;
}
case Token.RETURN :
frame.result = stack[stackTop];
frame.resultDbl = sDbl[stackTop];
--stackTop;
break Loop;
case Token.RETURN_RESULT :
break Loop;
case Icode_RETUNDEF :
frame.result = undefined;
break Loop;
case Token.BITNOT : {
int rIntValue = stack_int32(frame, stackTop);
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = ~rIntValue;
continue Loop;
}
case Token.BITAND :
case Token.BITOR :
case Token.BITXOR :
case Token.LSH :
case Token.RSH : {
int lIntValue = stack_int32(frame, stackTop-1);
int rIntValue = stack_int32(frame, stackTop);
stack[--stackTop] = DBL_MRK;
switch (op) {
case Token.BITAND:
lIntValue &= rIntValue;
break;
case Token.BITOR:
lIntValue |= rIntValue;
break;
case Token.BITXOR:
lIntValue ^= rIntValue;
break;
case Token.LSH:
lIntValue <<= rIntValue;
break;
case Token.RSH:
lIntValue >>= rIntValue;
break;
}
sDbl[stackTop] = lIntValue;
continue Loop;
}
case Token.URSH : {
double lDbl = stack_double(frame, stackTop-1);
int rIntValue = stack_int32(frame, stackTop) & 0x1F;
stack[--stackTop] = DBL_MRK;
sDbl[stackTop] = ScriptRuntime.toUint32(lDbl) >>> rIntValue;
continue Loop;
}
case Token.NEG :
case Token.POS : {
double rDbl = stack_double(frame, stackTop);
stack[stackTop] = DBL_MRK;
if (op == Token.NEG) {
rDbl = -rDbl;
}
sDbl[stackTop] = rDbl;
continue Loop;
}
case Token.ADD :
--stackTop;
do_add(stack, sDbl, stackTop, cx);
continue Loop;
case Token.SUB :
case Token.MUL :
case Token.DIV :
case Token.MOD : {
double rDbl = stack_double(frame, stackTop);
--stackTop;
double lDbl = stack_double(frame, stackTop);
stack[stackTop] = DBL_MRK;
switch (op) {
case Token.SUB:
lDbl -= rDbl;
break;
case Token.MUL:
lDbl *= rDbl;
break;
case Token.DIV:
lDbl /= rDbl;
break;
case Token.MOD:
lDbl %= rDbl;
break;
}
sDbl[stackTop] = lDbl;
continue Loop;
}
case Token.NOT :
stack[stackTop] = ScriptRuntime.wrapBoolean(
!stack_boolean(frame, stackTop));
continue Loop;
case Token.BINDNAME :
stack[++stackTop] = ScriptRuntime.bind(cx, frame.scope, stringReg);
continue Loop;
case Token.SETNAME : {
Object rhs = stack[stackTop];
if (rhs == DBL_MRK) rhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Scriptable lhs = (Scriptable)stack[stackTop];
stack[stackTop] = ScriptRuntime.setName(lhs, rhs, cx,
frame.scope, stringReg);
continue Loop;
}
case Icode_SETCONST: {
Object rhs = stack[stackTop];
if (rhs == DBL_MRK) rhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Scriptable lhs = (Scriptable)stack[stackTop];
stack[stackTop] = ScriptRuntime.setConst(lhs, rhs, cx, stringReg);
continue Loop;
}
case Token.DELPROP : {
Object rhs = stack[stackTop];
if (rhs == DBL_MRK) rhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.delete(lhs, rhs, cx);
continue Loop;
}
case Token.GETPROPNOWARN : {
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.getObjectPropNoWarn(lhs, stringReg, cx);
continue Loop;
}
case Token.GETPROP : {
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.getObjectProp(lhs, stringReg, cx, frame.scope);
continue Loop;
}
case Token.SETPROP : {
Object rhs = stack[stackTop];
if (rhs == DBL_MRK) rhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.setObjectProp(lhs, stringReg, rhs,
cx);
continue Loop;
}
case Icode_PROP_INC_DEC : {
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.propIncrDecr(lhs, stringReg,
cx, iCode[frame.pc]);
++frame.pc;
continue Loop;
}
case Token.GETELEM : {
--stackTop;
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) {
lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
}
Object value;
Object id = stack[stackTop + 1];
if (id != DBL_MRK) {
value = ScriptRuntime.getObjectElem(lhs, id, cx, frame.scope);
} else {
double d = sDbl[stackTop + 1];
value = ScriptRuntime.getObjectIndex(lhs, d, cx);
}
stack[stackTop] = value;
continue Loop;
}
case Token.SETELEM : {
stackTop -= 2;
Object rhs = stack[stackTop + 2];
if (rhs == DBL_MRK) {
rhs = ScriptRuntime.wrapNumber(sDbl[stackTop + 2]);
}
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) {
lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
}
Object value;
Object id = stack[stackTop + 1];
if (id != DBL_MRK) {
value = ScriptRuntime.setObjectElem(lhs, id, rhs, cx);
} else {
double d = sDbl[stackTop + 1];
value = ScriptRuntime.setObjectIndex(lhs, d, rhs, cx);
}
stack[stackTop] = value;
continue Loop;
}
case Icode_ELEM_INC_DEC: {
Object rhs = stack[stackTop];
if (rhs == DBL_MRK) rhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.elemIncrDecr(lhs, rhs, cx,
iCode[frame.pc]);
++frame.pc;
continue Loop;
}
case Token.GET_REF : {
Ref ref = (Ref)stack[stackTop];
stack[stackTop] = ScriptRuntime.refGet(ref, cx);
continue Loop;
}
case Token.SET_REF : {
Object value = stack[stackTop];
if (value == DBL_MRK) value = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Ref ref = (Ref)stack[stackTop];
stack[stackTop] = ScriptRuntime.refSet(ref, value, cx);
continue Loop;
}
case Token.DEL_REF : {
Ref ref = (Ref)stack[stackTop];
stack[stackTop] = ScriptRuntime.refDel(ref, cx);
continue Loop;
}
case Icode_REF_INC_DEC : {
Ref ref = (Ref)stack[stackTop];
stack[stackTop] = ScriptRuntime.refIncrDecr(ref, cx, iCode[frame.pc]);
++frame.pc;
continue Loop;
}
case Token.LOCAL_LOAD :
++stackTop;
indexReg += frame.localShift;
stack[stackTop] = stack[indexReg];
sDbl[stackTop] = sDbl[indexReg];
continue Loop;
case Icode_LOCAL_CLEAR :
indexReg += frame.localShift;
stack[indexReg] = null;
continue Loop;
case Icode_NAME_AND_THIS :
// stringReg: name
++stackTop;
stack[stackTop] = ScriptRuntime.getNameFunctionAndThis(stringReg,
cx, frame.scope);
++stackTop;
stack[stackTop] = ScriptRuntime.lastStoredScriptable(cx);
continue Loop;
case Icode_PROP_AND_THIS: {
Object obj = stack[stackTop];
if (obj == DBL_MRK) obj = ScriptRuntime.wrapNumber(sDbl[stackTop]);
// stringReg: property
stack[stackTop] = ScriptRuntime.getPropFunctionAndThis(obj, stringReg,
cx, frame.scope);
++stackTop;
stack[stackTop] = ScriptRuntime.lastStoredScriptable(cx);
continue Loop;
}
case Icode_ELEM_AND_THIS: {
Object obj = stack[stackTop - 1];
if (obj == DBL_MRK) obj = ScriptRuntime.wrapNumber(sDbl[stackTop - 1]);
Object id = stack[stackTop];
if (id == DBL_MRK) id = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop - 1] = ScriptRuntime.getElemFunctionAndThis(obj, id, cx);
stack[stackTop] = ScriptRuntime.lastStoredScriptable(cx);
continue Loop;
}
case Icode_VALUE_AND_THIS : {
Object value = stack[stackTop];
if (value == DBL_MRK) value = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.getValueFunctionAndThis(value, cx);
++stackTop;
stack[stackTop] = ScriptRuntime.lastStoredScriptable(cx);
continue Loop;
}
case Icode_CALLSPECIAL : {
if (instructionCounting) {
cx.instructionCount += INVOCATION_COST;
}
int callType = iCode[frame.pc] & 0xFF;
boolean isNew = (iCode[frame.pc + 1] != 0);
int sourceLine = getIndex(iCode, frame.pc + 2);
// indexReg: number of arguments
if (isNew) {
// stack change: function arg0 .. argN -> newResult
stackTop -= indexReg;
Object function = stack[stackTop];
if (function == DBL_MRK)
function = ScriptRuntime.wrapNumber(sDbl[stackTop]);
Object[] outArgs = getArgsArray(
stack, sDbl, stackTop + 1, indexReg);
stack[stackTop] = ScriptRuntime.newSpecial(
cx, function, outArgs, frame.scope, callType);
} else {
// stack change: function thisObj arg0 .. argN -> result
stackTop -= 1 + indexReg;
// Call code generation ensure that stack here
// is ... Callable Scriptable
Scriptable functionThis = (Scriptable)stack[stackTop + 1];
Callable function = (Callable)stack[stackTop];
Object[] outArgs = getArgsArray(
stack, sDbl, stackTop + 2, indexReg);
stack[stackTop] = ScriptRuntime.callSpecial(
cx, function, functionThis, outArgs,
frame.scope, frame.thisObj, callType,
frame.idata.itsSourceFile, sourceLine);
}
frame.pc += 4;
continue Loop;
}
case Token.CALL :
case Icode_TAIL_CALL :
case Token.REF_CALL : {
if (instructionCounting) {
cx.instructionCount += INVOCATION_COST;
}
// stack change: function thisObj arg0 .. argN -> result
// indexReg: number of arguments
stackTop -= 1 + indexReg;
// CALL generation ensures that fun and funThisObj
// are already Scriptable and Callable objects respectively
Callable fun = (Callable)stack[stackTop];
Scriptable funThisObj = (Scriptable)stack[stackTop + 1];
if (op == Token.REF_CALL) {
Object[] outArgs = getArgsArray(stack, sDbl, stackTop + 2,
indexReg);
stack[stackTop] = ScriptRuntime.callRef(fun, funThisObj,
outArgs, cx);
continue Loop;
}
Scriptable calleeScope = frame.scope;
if (frame.useActivation) {
calleeScope = ScriptableObject.getTopLevelScope(frame.scope);
}
if (fun instanceof InterpretedFunction) {
InterpretedFunction ifun = (InterpretedFunction)fun;
if (frame.fnOrScript.securityDomain == ifun.securityDomain) {
CallFrame callParentFrame = frame;
CallFrame calleeFrame = new CallFrame();
if (op == Icode_TAIL_CALL) {
// In principle tail call can re-use the current
// frame and its stack arrays but it is hard to
// do properly. Any exceptions that can legally
// happen during frame re-initialization including
// StackOverflowException during innocent looking
// System.arraycopy may leave the current frame
// data corrupted leading to undefined behaviour
// in the catch code bellow that unwinds JS stack
// on exceptions. Then there is issue about frame release
// end exceptions there.
// To avoid frame allocation a released frame
// can be cached for re-use which would also benefit
// non-tail calls but it is not clear that this caching
// would gain in performance due to potentially
// bad interaction with GC.
callParentFrame = frame.parentFrame;
// Release the current frame. See Bug #344501 to see why
// it is being done here.
exitFrame(cx, frame, null);
}
initFrame(cx, calleeScope, funThisObj, stack, sDbl,
stackTop + 2, indexReg, ifun, callParentFrame,
calleeFrame);
if (op != Icode_TAIL_CALL) {
frame.savedStackTop = stackTop;
frame.savedCallOp = op;
}
frame = calleeFrame;
continue StateLoop;
}
}
if (fun instanceof NativeContinuation) {
// Jump to the captured continuation
ContinuationJump cjump;
cjump = new ContinuationJump((NativeContinuation)fun, frame);
// continuation result is the first argument if any
// of continuation call
if (indexReg == 0) {
cjump.result = undefined;
} else {
cjump.result = stack[stackTop + 2];
cjump.resultDbl = sDbl[stackTop + 2];
}
// Start the real unwind job
throwable = cjump;
break withoutExceptions;
}
if (fun instanceof IdFunctionObject) {
IdFunctionObject ifun = (IdFunctionObject)fun;
if (NativeContinuation.isContinuationConstructor(ifun)) {
frame.stack[stackTop] = captureContinuation(cx,
frame.parentFrame, false);
continue Loop;
}
// Bug 405654 -- make best effort to keep Function.apply and
// Function.call within this interpreter loop invocation
if (BaseFunction.isApplyOrCall(ifun)) {
Callable applyCallable = ScriptRuntime.getCallable(funThisObj);
if (applyCallable instanceof InterpretedFunction) {
InterpretedFunction iApplyCallable = (InterpretedFunction)applyCallable;
if (frame.fnOrScript.securityDomain == iApplyCallable.securityDomain) {
frame = initFrameForApplyOrCall(cx, frame, indexReg,
stack, sDbl, stackTop, op, calleeScope, ifun,
iApplyCallable);
continue StateLoop;
}
}
}
}
// Bug 447697 -- make best effort to keep __noSuchMethod__ within this
// interpreter loop invocation
if (fun instanceof NoSuchMethodShim) {
// get the shim and the actual method
NoSuchMethodShim noSuchMethodShim = (NoSuchMethodShim) fun;
Callable noSuchMethodMethod = noSuchMethodShim.noSuchMethodMethod;
// if the method is in fact an InterpretedFunction
if (noSuchMethodMethod instanceof InterpretedFunction) {
InterpretedFunction ifun = (InterpretedFunction) noSuchMethodMethod;
if (frame.fnOrScript.securityDomain == ifun.securityDomain) {
frame = initFrameForNoSuchMethod(cx, frame, indexReg, stack, sDbl,
stackTop, op, funThisObj, calleeScope,
noSuchMethodShim, ifun);
continue StateLoop;
}
}
}
cx.lastInterpreterFrame = frame;
frame.savedCallOp = op;
frame.savedStackTop = stackTop;
stack[stackTop] = fun.call(cx, calleeScope, funThisObj,
getArgsArray(stack, sDbl, stackTop + 2, indexReg));
cx.lastInterpreterFrame = null;
continue Loop;
}
case Token.NEW : {
if (instructionCounting) {
cx.instructionCount += INVOCATION_COST;
}
// stack change: function arg0 .. argN -> newResult
// indexReg: number of arguments
stackTop -= indexReg;
Object lhs = stack[stackTop];
if (lhs instanceof InterpretedFunction) {
InterpretedFunction f = (InterpretedFunction)lhs;
if (frame.fnOrScript.securityDomain == f.securityDomain) {
Scriptable newInstance = f.createObject(cx, frame.scope);
CallFrame calleeFrame = new CallFrame();
initFrame(cx, frame.scope, newInstance, stack, sDbl,
stackTop + 1, indexReg, f, frame,
calleeFrame);
stack[stackTop] = newInstance;
frame.savedStackTop = stackTop;
frame.savedCallOp = op;
frame = calleeFrame;
continue StateLoop;
}
}
if (!(lhs instanceof Function)) {
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
throw ScriptRuntime.notFunctionError(lhs);
}
Function fun = (Function)lhs;
if (fun instanceof IdFunctionObject) {
IdFunctionObject ifun = (IdFunctionObject)fun;
if (NativeContinuation.isContinuationConstructor(ifun)) {
frame.stack[stackTop] =
captureContinuation(cx, frame.parentFrame, false);
continue Loop;
}
}
Object[] outArgs = getArgsArray(stack, sDbl, stackTop + 1, indexReg);
stack[stackTop] = fun.construct(cx, frame.scope, outArgs);
continue Loop;
}
case Token.TYPEOF : {
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.typeof(lhs);
continue Loop;
}
case Icode_TYPEOFNAME :
stack[++stackTop] = ScriptRuntime.typeofName(frame.scope, stringReg);
continue Loop;
case Token.STRING :
stack[++stackTop] = stringReg;
continue Loop;
case Icode_SHORTNUMBER :
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = getShort(iCode, frame.pc);
frame.pc += 2;
continue Loop;
case Icode_INTNUMBER :
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = getInt(iCode, frame.pc);
frame.pc += 4;
continue Loop;
case Token.NUMBER :
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = frame.idata.itsDoubleTable[indexReg];
continue Loop;
case Token.NAME :
stack[++stackTop] = ScriptRuntime.name(cx, frame.scope, stringReg);
continue Loop;
case Icode_NAME_INC_DEC :
stack[++stackTop] = ScriptRuntime.nameIncrDecr(frame.scope, stringReg,
cx, iCode[frame.pc]);
++frame.pc;
continue Loop;
case Icode_SETCONSTVAR1:
indexReg = iCode[frame.pc++];
// fallthrough
case Token.SETCONSTVAR :
if (!frame.useActivation) {
if ((varAttributes[indexReg] & ScriptableObject.READONLY) == 0) {
throw Context.reportRuntimeError1("msg.var.redecl",
frame.idata.argNames[indexReg]);
}
if ((varAttributes[indexReg] & ScriptableObject.UNINITIALIZED_CONST)
!= 0)
{
vars[indexReg] = stack[stackTop];
varAttributes[indexReg] &= ~ScriptableObject.UNINITIALIZED_CONST;
varDbls[indexReg] = sDbl[stackTop];
}
} else {
Object val = stack[stackTop];
if (val == DBL_MRK) val = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stringReg = frame.idata.argNames[indexReg];
if (frame.scope instanceof ConstProperties) {
ConstProperties cp = (ConstProperties)frame.scope;
cp.putConst(stringReg, frame.scope, val);
} else
throw Kit.codeBug();
}
continue Loop;
case Icode_SETVAR1:
indexReg = iCode[frame.pc++];
// fallthrough
case Token.SETVAR :
if (!frame.useActivation) {
if ((varAttributes[indexReg] & ScriptableObject.READONLY) == 0) {
vars[indexReg] = stack[stackTop];
varDbls[indexReg] = sDbl[stackTop];
}
} else {
Object val = stack[stackTop];
if (val == DBL_MRK) val = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stringReg = frame.idata.argNames[indexReg];
frame.scope.put(stringReg, frame.scope, val);
}
continue Loop;
case Icode_GETVAR1:
indexReg = iCode[frame.pc++];
// fallthrough
case Token.GETVAR :
++stackTop;
if (!frame.useActivation) {
stack[stackTop] = vars[indexReg];
sDbl[stackTop] = varDbls[indexReg];
} else {
stringReg = frame.idata.argNames[indexReg];
stack[stackTop] = frame.scope.get(stringReg, frame.scope);
}
continue Loop;
case Icode_VAR_INC_DEC : {
// indexReg : varindex
++stackTop;
int incrDecrMask = iCode[frame.pc];
if (!frame.useActivation) {
stack[stackTop] = DBL_MRK;
Object varValue = vars[indexReg];
double d;
if (varValue == DBL_MRK) {
d = varDbls[indexReg];
} else {
d = ScriptRuntime.toNumber(varValue);
vars[indexReg] = DBL_MRK;
}
double d2 = ((incrDecrMask & Node.DECR_FLAG) == 0)
? d + 1.0 : d - 1.0;
varDbls[indexReg] = d2;
sDbl[stackTop] = ((incrDecrMask & Node.POST_FLAG) == 0) ? d2 : d;
} else {
String varName = frame.idata.argNames[indexReg];
stack[stackTop] = ScriptRuntime.nameIncrDecr(frame.scope, varName,
cx, incrDecrMask);
}
++frame.pc;
continue Loop;
}
case Icode_ZERO :
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = 0;
continue Loop;
case Icode_ONE :
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = 1;
continue Loop;
case Token.NULL :
stack[++stackTop] = null;
continue Loop;
case Token.THIS :
stack[++stackTop] = frame.thisObj;
continue Loop;
case Token.THISFN :
stack[++stackTop] = frame.fnOrScript;
continue Loop;
case Token.FALSE :
stack[++stackTop] = Boolean.FALSE;
continue Loop;
case Token.TRUE :
stack[++stackTop] = Boolean.TRUE;
continue Loop;
case Icode_UNDEF :
stack[++stackTop] = undefined;
continue Loop;
case Token.ENTERWITH : {
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
frame.scope = ScriptRuntime.enterWith(lhs, cx, frame.scope);
continue Loop;
}
case Token.LEAVEWITH :
frame.scope = ScriptRuntime.leaveWith(frame.scope);
continue Loop;
case Token.CATCH_SCOPE : {
// stack top: exception object
// stringReg: name of exception variable
// indexReg: local for exception scope
--stackTop;
indexReg += frame.localShift;
boolean afterFirstScope = (frame.idata.itsICode[frame.pc] != 0);
Throwable caughtException = (Throwable)stack[stackTop + 1];
Scriptable lastCatchScope;
if (!afterFirstScope) {
lastCatchScope = null;
} else {
lastCatchScope = (Scriptable)stack[indexReg];
}
stack[indexReg] = ScriptRuntime.newCatchScope(caughtException,
lastCatchScope, stringReg,
cx, frame.scope);
++frame.pc;
continue Loop;
}
case Token.ENUM_INIT_KEYS :
case Token.ENUM_INIT_VALUES :
case Token.ENUM_INIT_ARRAY : {
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
indexReg += frame.localShift;
int enumType = op == Token.ENUM_INIT_KEYS
? ScriptRuntime.ENUMERATE_KEYS :
op == Token.ENUM_INIT_VALUES
? ScriptRuntime.ENUMERATE_VALUES :
ScriptRuntime.ENUMERATE_ARRAY;
stack[indexReg] = ScriptRuntime.enumInit(lhs, cx, enumType);
continue Loop;
}
case Token.ENUM_NEXT :
case Token.ENUM_ID : {
indexReg += frame.localShift;
Object val = stack[indexReg];
++stackTop;
stack[stackTop] = (op == Token.ENUM_NEXT)
? (Object)ScriptRuntime.enumNext(val)
: (Object)ScriptRuntime.enumId(val, cx);
continue Loop;
}
case Token.REF_SPECIAL : {
//stringReg: name of special property
Object obj = stack[stackTop];
if (obj == DBL_MRK) obj = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.specialRef(obj, stringReg, cx);
continue Loop;
}
case Token.REF_MEMBER: {
//indexReg: flags
Object elem = stack[stackTop];
if (elem == DBL_MRK) elem = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object obj = stack[stackTop];
if (obj == DBL_MRK) obj = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.memberRef(obj, elem, cx, indexReg);
continue Loop;
}
case Token.REF_NS_MEMBER: {
//indexReg: flags
Object elem = stack[stackTop];
if (elem == DBL_MRK) elem = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object ns = stack[stackTop];
if (ns == DBL_MRK) ns = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object obj = stack[stackTop];
if (obj == DBL_MRK) obj = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.memberRef(obj, ns, elem, cx, indexReg);
continue Loop;
}
case Token.REF_NAME: {
//indexReg: flags
Object name = stack[stackTop];
if (name == DBL_MRK) name = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.nameRef(name, cx, frame.scope,
indexReg);
continue Loop;
}
case Token.REF_NS_NAME: {
//indexReg: flags
Object name = stack[stackTop];
if (name == DBL_MRK) name = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
Object ns = stack[stackTop];
if (ns == DBL_MRK) ns = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.nameRef(ns, name, cx, frame.scope,
indexReg);
continue Loop;
}
case Icode_SCOPE_LOAD :
indexReg += frame.localShift;
frame.scope = (Scriptable)stack[indexReg];
continue Loop;
case Icode_SCOPE_SAVE :
indexReg += frame.localShift;
stack[indexReg] = frame.scope;
continue Loop;
case Icode_CLOSURE_EXPR :
stack[++stackTop] = InterpretedFunction.createFunction(cx, frame.scope,
frame.fnOrScript,
indexReg);
continue Loop;
case Icode_CLOSURE_STMT :
initFunction(cx, frame.scope, frame.fnOrScript, indexReg);
continue Loop;
case Token.REGEXP :
stack[++stackTop] = frame.scriptRegExps[indexReg];
continue Loop;
case Icode_LITERAL_NEW :
// indexReg: number of values in the literal
++stackTop;
stack[stackTop] = new int[indexReg];
++stackTop;
stack[stackTop] = new Object[indexReg];
sDbl[stackTop] = 0;
continue Loop;
case Icode_LITERAL_SET : {
Object value = stack[stackTop];
if (value == DBL_MRK) value = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
int i = (int)sDbl[stackTop];
((Object[])stack[stackTop])[i] = value;
sDbl[stackTop] = i + 1;
continue Loop;
}
case Icode_LITERAL_GETTER : {
Object value = stack[stackTop];
--stackTop;
int i = (int)sDbl[stackTop];
((Object[])stack[stackTop])[i] = value;
((int[])stack[stackTop - 1])[i] = -1;
sDbl[stackTop] = i + 1;
continue Loop;
}
case Icode_LITERAL_SETTER : {
Object value = stack[stackTop];
--stackTop;
int i = (int)sDbl[stackTop];
((Object[])stack[stackTop])[i] = value;
((int[])stack[stackTop - 1])[i] = +1;
sDbl[stackTop] = i + 1;
continue Loop;
}
case Token.ARRAYLIT :
case Icode_SPARE_ARRAYLIT :
case Token.OBJECTLIT : {
Object[] data = (Object[])stack[stackTop];
--stackTop;
int[] getterSetters = (int[])stack[stackTop];
Object val;
if (op == Token.OBJECTLIT) {
Object[] ids = (Object[])frame.idata.literalIds[indexReg];
val = ScriptRuntime.newObjectLiteral(ids, data, getterSetters, cx,
frame.scope);
} else {
int[] skipIndexces = null;
if (op == Icode_SPARE_ARRAYLIT) {
skipIndexces = (int[])frame.idata.literalIds[indexReg];
}
val = ScriptRuntime.newArrayLiteral(data, skipIndexces, cx,
frame.scope);
}
stack[stackTop] = val;
continue Loop;
}
case Icode_ENTERDQ : {
Object lhs = stack[stackTop];
if (lhs == DBL_MRK) lhs = ScriptRuntime.wrapNumber(sDbl[stackTop]);
--stackTop;
frame.scope = ScriptRuntime.enterDotQuery(lhs, frame.scope);
continue Loop;
}
case Icode_LEAVEDQ : {
boolean valBln = stack_boolean(frame, stackTop);
Object x = ScriptRuntime.updateDotQuery(valBln, frame.scope);
if (x != null) {
stack[stackTop] = x;
frame.scope = ScriptRuntime.leaveDotQuery(frame.scope);
frame.pc += 2;
continue Loop;
}
// reset stack and PC to code after ENTERDQ
--stackTop;
break jumplessRun;
}
case Token.DEFAULTNAMESPACE : {
Object value = stack[stackTop];
if (value == DBL_MRK) value = ScriptRuntime.wrapNumber(sDbl[stackTop]);
stack[stackTop] = ScriptRuntime.setDefaultNamespace(value, cx);
continue Loop;
}
case Token.ESCXMLATTR : {
Object value = stack[stackTop];
if (value != DBL_MRK) {
stack[stackTop] = ScriptRuntime.escapeAttributeValue(value, cx);
}
continue Loop;
}
case Token.ESCXMLTEXT : {
Object value = stack[stackTop];
if (value != DBL_MRK) {
stack[stackTop] = ScriptRuntime.escapeTextValue(value, cx);
}
continue Loop;
}
case Icode_DEBUGGER:
if (frame.debuggerFrame != null) {
frame.debuggerFrame.onDebuggerStatement(cx);
}
continue Loop;
case Icode_LINE :
frame.pcSourceLineStart = frame.pc;
if (frame.debuggerFrame != null) {
int line = getIndex(iCode, frame.pc);
frame.debuggerFrame.onLineChange(cx, line);
}
frame.pc += 2;
continue Loop;
case Icode_REG_IND_C0:
indexReg = 0;
continue Loop;
case Icode_REG_IND_C1:
indexReg = 1;
continue Loop;
case Icode_REG_IND_C2:
indexReg = 2;
continue Loop;
case Icode_REG_IND_C3:
indexReg = 3;
continue Loop;
case Icode_REG_IND_C4:
indexReg = 4;
continue Loop;
case Icode_REG_IND_C5:
indexReg = 5;
continue Loop;
case Icode_REG_IND1:
indexReg = 0xFF & iCode[frame.pc];
++frame.pc;
continue Loop;
case Icode_REG_IND2:
indexReg = getIndex(iCode, frame.pc);
frame.pc += 2;
continue Loop;
case Icode_REG_IND4:
indexReg = getInt(iCode, frame.pc);
frame.pc += 4;
continue Loop;
case Icode_REG_STR_C0:
stringReg = strings[0];
continue Loop;
case Icode_REG_STR_C1:
stringReg = strings[1];
continue Loop;
case Icode_REG_STR_C2:
stringReg = strings[2];
continue Loop;
case Icode_REG_STR_C3:
stringReg = strings[3];
continue Loop;
case Icode_REG_STR1:
stringReg = strings[0xFF & iCode[frame.pc]];
++frame.pc;
continue Loop;
case Icode_REG_STR2:
stringReg = strings[getIndex(iCode, frame.pc)];
frame.pc += 2;
continue Loop;
case Icode_REG_STR4:
stringReg = strings[getInt(iCode, frame.pc)];
frame.pc += 4;
continue Loop;
default :
dumpICode(frame.idata);
throw new RuntimeException(
"Unknown icode : "+op+" @ pc : "+(frame.pc-1));
} // end of interpreter switch
} // end of jumplessRun label block
// This should be reachable only for jump implementation
// when pc points to encoded target offset
if (instructionCounting) {
addInstructionCount(cx, frame, 2);
}
int offset = getShort(iCode, frame.pc);
if (offset != 0) {
// -1 accounts for pc pointing to jump opcode + 1
frame.pc += offset - 1;
} else {
frame.pc = frame.idata.longJumps.
getExistingInt(frame.pc);
}
if (instructionCounting) {
frame.pcPrevBranch = frame.pc;
}
continue Loop;
} // end of Loop: for
exitFrame(cx, frame, null);
interpreterResult = frame.result;
interpreterResultDbl = frame.resultDbl;
if (frame.parentFrame != null) {
frame = frame.parentFrame;
if (frame.frozen) {
frame = frame.cloneFrozen();
}
setCallResult(
frame, interpreterResult, interpreterResultDbl);
interpreterResult = null; // Help GC
continue StateLoop;
}
break StateLoop;
} // end of interpreter withoutExceptions: try
catch (Throwable ex) {
if (throwable != null) {
// This is serious bug and it is better to track it ASAP
ex.printStackTrace(System.err);
throw new IllegalStateException();
}
throwable = ex;
}
// This should be reachable only after above catch or from
// finally when it needs to propagate exception or from
// explicit throw
if (throwable == null) Kit.codeBug();
// Exception type
final int EX_CATCH_STATE = 2; // Can execute JS catch
final int EX_FINALLY_STATE = 1; // Can execute JS finally
final int EX_NO_JS_STATE = 0; // Terminate JS execution
int exState;
ContinuationJump cjump = null;
if (generatorState != null &&
generatorState.operation == NativeGenerator.GENERATOR_CLOSE &&
throwable == generatorState.value)
{
exState = EX_FINALLY_STATE;
} else if (throwable instanceof JavaScriptException) {
exState = EX_CATCH_STATE;
} else if (throwable instanceof EcmaError) {
// an offical ECMA error object,
exState = EX_CATCH_STATE;
} else if (throwable instanceof EvaluatorException) {
exState = EX_CATCH_STATE;
} else if (throwable instanceof RuntimeException) {
exState = cx.hasFeature(Context.FEATURE_ENHANCED_JAVA_ACCESS)
? EX_CATCH_STATE
: EX_FINALLY_STATE;
} else if (throwable instanceof Error) {
exState = cx.hasFeature(Context.FEATURE_ENHANCED_JAVA_ACCESS)
? EX_CATCH_STATE
: EX_NO_JS_STATE;
} else if (throwable instanceof ContinuationJump) {
// It must be ContinuationJump
exState = EX_FINALLY_STATE;
cjump = (ContinuationJump)throwable;
} else {
exState = cx.hasFeature(Context.FEATURE_ENHANCED_JAVA_ACCESS)
? EX_CATCH_STATE
: EX_FINALLY_STATE;
}
if (instructionCounting) {
try {
addInstructionCount(cx, frame, EXCEPTION_COST);
} catch (RuntimeException ex) {
throwable = ex;
exState = EX_FINALLY_STATE;
} catch (Error ex) {
// Error from instruction counting
// => unconditionally terminate JS
throwable = ex;
cjump = null;
exState = EX_NO_JS_STATE;
}
}
if (frame.debuggerFrame != null
&& throwable instanceof RuntimeException)
{
// Call debugger only for RuntimeException
RuntimeException rex = (RuntimeException)throwable;
try {
frame.debuggerFrame.onExceptionThrown(cx, rex);
} catch (Throwable ex) {
// Any exception from debugger
// => unconditionally terminate JS
throwable = ex;
cjump = null;
exState = EX_NO_JS_STATE;
}
}
for (;;) {
if (exState != EX_NO_JS_STATE) {
boolean onlyFinally = (exState != EX_CATCH_STATE);
indexReg = getExceptionHandler(frame, onlyFinally);
if (indexReg >= 0) {
// We caught an exception, restart the loop
// with exception pending the processing at the loop
// start
continue StateLoop;
}
}
// No allowed exception handlers in this frame, unwind
// to parent and try to look there
exitFrame(cx, frame, throwable);
frame = frame.parentFrame;
if (frame == null) { break; }
if (cjump != null && cjump.branchFrame == frame) {
// Continuation branch point was hit,
// restart the state loop to reenter continuation
indexReg = -1;
continue StateLoop;
}
}
// No more frames, rethrow the exception or deal with continuation
if (cjump != null) {
if (cjump.branchFrame != null) {
// The above loop should locate the top frame
Kit.codeBug();
}
if (cjump.capturedFrame != null) {
// Restarting detached continuation
indexReg = -1;
continue StateLoop;
}
// Return continuation result to the caller
interpreterResult = cjump.result;
interpreterResultDbl = cjump.resultDbl;
throwable = null;
}
break StateLoop;
} // end of StateLoop: for(;;)
// Do cleanups/restorations before the final return or throw
if (cx.previousInterpreterInvocations != null
&& cx.previousInterpreterInvocations.size() != 0)
{
cx.lastInterpreterFrame
= cx.previousInterpreterInvocations.pop();
} else {
// It was the last interpreter frame on the stack
cx.lastInterpreterFrame = null;
// Force GC of the value cx.previousInterpreterInvocations
cx.previousInterpreterInvocations = null;
}
if (throwable != null) {
if (throwable instanceof RuntimeException) {
throw (RuntimeException)throwable;
} else {
// Must be instance of Error or code bug
throw (Error)throwable;
}
}
return (interpreterResult != DBL_MRK)
? interpreterResult
: ScriptRuntime.wrapNumber(interpreterResultDbl);
}
/**
* Call __noSuchMethod__.
*/
private static CallFrame initFrameForNoSuchMethod(Context cx,
CallFrame frame, int indexReg, Object[] stack, double[] sDbl,
int stackTop, int op, Scriptable funThisObj, Scriptable calleeScope,
NoSuchMethodShim noSuchMethodShim, InterpretedFunction ifun)
{
// create an args array from the stack
Object[] argsArray = null;
// exactly like getArgsArray except that the first argument
// is the method name from the shim
int shift = stackTop + 2;
Object[] elements = new Object[indexReg];
for (int i=0; i < indexReg; ++i, ++shift) {
Object val = stack[shift];
if (val == UniqueTag.DOUBLE_MARK) {
val = ScriptRuntime.wrapNumber(sDbl[shift]);
}
elements[i] = val;
}
argsArray = new Object[2];
argsArray[0] = noSuchMethodShim.methodName;
argsArray[1] = cx.newArray(calleeScope, elements);
// exactly the same as if it's a regular InterpretedFunction
CallFrame callParentFrame = frame;
CallFrame calleeFrame = new CallFrame();
if (op == Icode_TAIL_CALL) {
callParentFrame = frame.parentFrame;
exitFrame(cx, frame, null);
}
// init the frame with the underlying method with the
// adjusted args array and shim's function
initFrame(cx, calleeScope, funThisObj, argsArray, null,
0, 2, ifun, callParentFrame, calleeFrame);
if (op != Icode_TAIL_CALL) {
frame.savedStackTop = stackTop;
frame.savedCallOp = op;
}
return calleeFrame;
}
private static boolean shallowEquals(Object[] stack, double[] sDbl,
int stackTop)
{
Object rhs = stack[stackTop + 1];
Object lhs = stack[stackTop];
final Object DBL_MRK = UniqueTag.DOUBLE_MARK;
double rdbl, ldbl;
if (rhs == DBL_MRK) {
rdbl = sDbl[stackTop + 1];
if (lhs == DBL_MRK) {
ldbl = sDbl[stackTop];
} else if (lhs instanceof Number) {
ldbl = ((Number)lhs).doubleValue();
} else {
return false;
}
} else if (lhs == DBL_MRK) {
ldbl = sDbl[stackTop];
if (rhs == DBL_MRK) {
rdbl = sDbl[stackTop + 1];
} else if (rhs instanceof Number) {
rdbl = ((Number)rhs).doubleValue();
} else {
return false;
}
} else {
return ScriptRuntime.shallowEq(lhs, rhs);
}
return (ldbl == rdbl);
}
private static CallFrame processThrowable(Context cx, Object throwable,
CallFrame frame, int indexReg,
boolean instructionCounting)
{
// Recovering from exception, indexReg contains
// the index of handler
if (indexReg >= 0) {
// Normal exception handler, transfer
// control appropriately
if (frame.frozen) {
// XXX Deal with exceptios!!!
frame = frame.cloneFrozen();
}
int[] table = frame.idata.itsExceptionTable;
frame.pc = table[indexReg + EXCEPTION_HANDLER_SLOT];
if (instructionCounting) {
frame.pcPrevBranch = frame.pc;
}
frame.savedStackTop = frame.emptyStackTop;
int scopeLocal = frame.localShift
+ table[indexReg
+ EXCEPTION_SCOPE_SLOT];
int exLocal = frame.localShift
+ table[indexReg
+ EXCEPTION_LOCAL_SLOT];
frame.scope = (Scriptable)frame.stack[scopeLocal];
frame.stack[exLocal] = throwable;
throwable = null;
} else {
// Continuation restoration
ContinuationJump cjump = (ContinuationJump)throwable;
// Clear throwable to indicate that exceptions are OK
throwable = null;
if (cjump.branchFrame != frame) Kit.codeBug();
// Check that we have at least one frozen frame
// in the case of detached continuation restoration:
// unwind code ensure that
if (cjump.capturedFrame == null) Kit.codeBug();
// Need to rewind branchFrame, capturedFrame
// and all frames in between
int rewindCount = cjump.capturedFrame.frameIndex + 1;
if (cjump.branchFrame != null) {
rewindCount -= cjump.branchFrame.frameIndex;
}
int enterCount = 0;
CallFrame[] enterFrames = null;
CallFrame x = cjump.capturedFrame;
for (int i = 0; i != rewindCount; ++i) {
if (!x.frozen) Kit.codeBug();
if (isFrameEnterExitRequired(x)) {
if (enterFrames == null) {
// Allocate enough space to store the rest
// of rewind frames in case all of them
// would require to enter
enterFrames = new CallFrame[rewindCount
- i];
}
enterFrames[enterCount] = x;
++enterCount;
}
x = x.parentFrame;
}
while (enterCount != 0) {
// execute enter: walk enterFrames in the reverse
// order since they were stored starting from
// the capturedFrame, not branchFrame
--enterCount;
x = enterFrames[enterCount];
enterFrame(cx, x, ScriptRuntime.emptyArgs, true);
}
// Continuation jump is almost done: capturedFrame
// points to the call to the function that captured
// continuation, so clone capturedFrame and
// emulate return that function with the suplied result
frame = cjump.capturedFrame.cloneFrozen();
setCallResult(frame, cjump.result, cjump.resultDbl);
// restart the execution
}
frame.throwable = throwable;
return frame;
}
private static Object freezeGenerator(Context cx, CallFrame frame,
int stackTop,
GeneratorState generatorState)
{
if (generatorState.operation == NativeGenerator.GENERATOR_CLOSE) {
// Error: no yields when generator is closing
throw ScriptRuntime.typeError0("msg.yield.closing");
}
// return to our caller (which should be a method of NativeGenerator)
frame.frozen = true;
frame.result = frame.stack[stackTop];
frame.resultDbl = frame.sDbl[stackTop];
frame.savedStackTop = stackTop;
frame.pc--; // we want to come back here when we resume
ScriptRuntime.exitActivationFunction(cx);
return (frame.result != UniqueTag.DOUBLE_MARK)
? frame.result
: ScriptRuntime.wrapNumber(frame.resultDbl);
}
private static Object thawGenerator(CallFrame frame, int stackTop,
GeneratorState generatorState, int op)
{
// we are resuming execution
frame.frozen = false;
int sourceLine = getIndex(frame.idata.itsICode, frame.pc);
frame.pc += 2; // skip line number data
if (generatorState.operation == NativeGenerator.GENERATOR_THROW) {
// processing a call to <generator>.throw(exception): must
// act as if exception was thrown from resumption point
return new JavaScriptException(generatorState.value,
frame.idata.itsSourceFile,
sourceLine);
}
if (generatorState.operation == NativeGenerator.GENERATOR_CLOSE) {
return generatorState.value;
}
if (generatorState.operation != NativeGenerator.GENERATOR_SEND)
throw Kit.codeBug();
if (op == Token.YIELD)
frame.stack[stackTop] = generatorState.value;
return Scriptable.NOT_FOUND;
}
private static CallFrame initFrameForApplyOrCall(Context cx, CallFrame frame,
int indexReg, Object[] stack, double[] sDbl, int stackTop, int op,
Scriptable calleeScope, IdFunctionObject ifun,
InterpretedFunction iApplyCallable)
{
Scriptable applyThis;
if (indexReg != 0) {
Object obj = stack[stackTop + 2];
if (obj == UniqueTag.DOUBLE_MARK)
obj = ScriptRuntime.wrapNumber(sDbl[stackTop + 2]);
applyThis = ScriptRuntime.toObjectOrNull(cx, obj);
}
else {
applyThis = null;
}
if (applyThis == null) {
// This covers the case of args[0] == (null|undefined) as well.
applyThis = ScriptRuntime.getTopCallScope(cx);
}
if(op == Icode_TAIL_CALL) {
exitFrame(cx, frame, null);
frame = frame.parentFrame;
}
else {
frame.savedStackTop = stackTop;
frame.savedCallOp = op;
}
CallFrame calleeFrame = new CallFrame();
if(BaseFunction.isApply(ifun)) {
Object[] callArgs = indexReg < 2 ? ScriptRuntime.emptyArgs :
ScriptRuntime.getApplyArguments(cx, stack[stackTop + 3]);
initFrame(cx, calleeScope, applyThis, callArgs, null, 0,
callArgs.length, iApplyCallable, frame, calleeFrame);
}
else {
// Shift args left
for(int i = 1; i < indexReg; ++i) {
stack[stackTop + 1 + i] = stack[stackTop + 2 + i];
sDbl[stackTop + 1 + i] = sDbl[stackTop + 2 + i];
}
int argCount = indexReg < 2 ? 0 : indexReg - 1;
initFrame(cx, calleeScope, applyThis, stack, sDbl, stackTop + 2,
argCount, iApplyCallable, frame, calleeFrame);
}
frame = calleeFrame;
return frame;
}
private static void initFrame(Context cx, Scriptable callerScope,
Scriptable thisObj,
Object[] args, double[] argsDbl,
int argShift, int argCount,
InterpretedFunction fnOrScript,
CallFrame parentFrame, CallFrame frame)
{
InterpreterData idata = fnOrScript.idata;
boolean useActivation = idata.itsNeedsActivation;
DebugFrame debuggerFrame = null;
if (cx.debugger != null) {
debuggerFrame = cx.debugger.getFrame(cx, idata);
if (debuggerFrame != null) {
useActivation = true;
}
}
if (useActivation) {
// Copy args to new array to pass to enterActivationFunction
// or debuggerFrame.onEnter
if (argsDbl != null) {
args = getArgsArray(args, argsDbl, argShift, argCount);
}
argShift = 0;
argsDbl = null;
}
Scriptable scope;
if (idata.itsFunctionType != 0) {
if (!idata.useDynamicScope) {
scope = fnOrScript.getParentScope();
} else {
scope = callerScope;
}
if (useActivation) {
scope = ScriptRuntime.createFunctionActivation(
fnOrScript, scope, args);
}
} else {
scope = callerScope;
ScriptRuntime.initScript(fnOrScript, thisObj, cx, scope,
fnOrScript.idata.evalScriptFlag);
}
if (idata.itsNestedFunctions != null) {
if (idata.itsFunctionType != 0 && !idata.itsNeedsActivation)
Kit.codeBug();
for (int i = 0; i < idata.itsNestedFunctions.length; i++) {
InterpreterData fdata = idata.itsNestedFunctions[i];
if (fdata.itsFunctionType == FunctionNode.FUNCTION_STATEMENT) {
initFunction(cx, scope, fnOrScript, i);
}
}
}
Scriptable[] scriptRegExps = null;
if (idata.itsRegExpLiterals != null) {
// Wrapped regexps for functions are stored in
// InterpretedFunction
// but for script which should not contain references to scope
// the regexps re-wrapped during each script execution
if (idata.itsFunctionType != 0) {
scriptRegExps = fnOrScript.functionRegExps;
} else {
scriptRegExps = fnOrScript.createRegExpWraps(cx, scope);
}
}
// Initialize args, vars, locals and stack
int emptyStackTop = idata.itsMaxVars + idata.itsMaxLocals - 1;
int maxFrameArray = idata.itsMaxFrameArray;
if (maxFrameArray != emptyStackTop + idata.itsMaxStack + 1)
Kit.codeBug();
Object[] stack;
int[] stackAttributes;
double[] sDbl;
boolean stackReuse;
if (frame.stack != null && maxFrameArray <= frame.stack.length) {
// Reuse stacks from old frame
stackReuse = true;
stack = frame.stack;
stackAttributes = frame.stackAttributes;
sDbl = frame.sDbl;
} else {
stackReuse = false;
stack = new Object[maxFrameArray];
stackAttributes = new int[maxFrameArray];
sDbl = new double[maxFrameArray];
}
int varCount = idata.getParamAndVarCount();
for (int i = 0; i < varCount; i++) {
if (idata.getParamOrVarConst(i))
stackAttributes[i] = ScriptableObject.CONST;
}
int definedArgs = idata.argCount;
if (definedArgs > argCount) { definedArgs = argCount; }
// Fill the frame structure
frame.parentFrame = parentFrame;
frame.frameIndex = (parentFrame == null)
? 0 : parentFrame.frameIndex + 1;
if(frame.frameIndex > cx.getMaximumInterpreterStackDepth())
{
throw Context.reportRuntimeError("Exceeded maximum stack depth");
}
frame.frozen = false;
frame.fnOrScript = fnOrScript;
frame.idata = idata;
frame.stack = stack;
frame.stackAttributes = stackAttributes;
frame.sDbl = sDbl;
frame.varSource = frame;
frame.localShift = idata.itsMaxVars;
frame.emptyStackTop = emptyStackTop;
frame.debuggerFrame = debuggerFrame;
frame.useActivation = useActivation;
frame.thisObj = thisObj;
frame.scriptRegExps = scriptRegExps;
// Initialize initial values of variables that change during
// interpretation.
frame.result = Undefined.instance;
frame.pc = 0;
frame.pcPrevBranch = 0;
frame.pcSourceLineStart = idata.firstLinePC;
frame.scope = scope;
frame.savedStackTop = emptyStackTop;
frame.savedCallOp = 0;
System.arraycopy(args, argShift, stack, 0, definedArgs);
if (argsDbl != null) {
System.arraycopy(argsDbl, argShift, sDbl, 0, definedArgs);
}
for (int i = definedArgs; i != idata.itsMaxVars; ++i) {
stack[i] = Undefined.instance;
}
if (stackReuse) {
// Clean the stack part and space beyond stack if any
// of the old array to allow to GC objects there
for (int i = emptyStackTop + 1; i != stack.length; ++i) {
stack[i] = null;
}
}
enterFrame(cx, frame, args, false);
}
private static boolean isFrameEnterExitRequired(CallFrame frame)
{
return frame.debuggerFrame != null || frame.idata.itsNeedsActivation;
}
private static void enterFrame(Context cx, CallFrame frame, Object[] args,
boolean continuationRestart)
{
boolean usesActivation = frame.idata.itsNeedsActivation;
boolean isDebugged = frame.debuggerFrame != null;
if(usesActivation || isDebugged) {
Scriptable scope = frame.scope;
if(scope == null) {
Kit.codeBug();
} else if (continuationRestart) {
// Walk the parent chain of frame.scope until a NativeCall is
// found. Normally, frame.scope is a NativeCall when called
// from initFrame() for a debugged or activatable function.
// However, when called from interpretLoop() as part of
// restarting a continuation, it can also be a NativeWith if
// the continuation was captured within a "with" or "catch"
// block ("catch" implicitly uses NativeWith to create a scope
// to expose the exception variable).
for(;;) {
if(scope instanceof NativeWith) {
scope = scope.getParentScope();
if (scope == null || (frame.parentFrame != null &&
frame.parentFrame.scope == scope))
{
// If we get here, we didn't find a NativeCall in
// the call chain before reaching parent frame's
// scope. This should not be possible.
Kit.codeBug();
break; // Never reached, but keeps the static analyzer happy about "scope" not being null 5 lines above.
}
}
else {
break;
}
}
}
if (isDebugged) {
frame.debuggerFrame.onEnter(cx, scope, frame.thisObj, args);
}
// Enter activation only when itsNeedsActivation true,
// since debugger should not interfere with activation
// chaining
if (usesActivation) {
ScriptRuntime.enterActivationFunction(cx, scope);
}
}
}
private static void exitFrame(Context cx, CallFrame frame,
Object throwable)
{
if (frame.idata.itsNeedsActivation) {
ScriptRuntime.exitActivationFunction(cx);
}
if (frame.debuggerFrame != null) {
try {
if (throwable instanceof Throwable) {
frame.debuggerFrame.onExit(cx, true, throwable);
} else {
Object result;
ContinuationJump cjump = (ContinuationJump)throwable;
if (cjump == null) {
result = frame.result;
} else {
result = cjump.result;
}
if (result == UniqueTag.DOUBLE_MARK) {
double resultDbl;
if (cjump == null) {
resultDbl = frame.resultDbl;
} else {
resultDbl = cjump.resultDbl;
}
result = ScriptRuntime.wrapNumber(resultDbl);
}
frame.debuggerFrame.onExit(cx, false, result);
}
} catch (Throwable ex) {
System.err.println(
"RHINO USAGE WARNING: onExit terminated with exception");
ex.printStackTrace(System.err);
}
}
}
private static void setCallResult(CallFrame frame,
Object callResult,
double callResultDbl)
{
if (frame.savedCallOp == Token.CALL) {
frame.stack[frame.savedStackTop] = callResult;
frame.sDbl[frame.savedStackTop] = callResultDbl;
} else if (frame.savedCallOp == Token.NEW) {
// If construct returns scriptable,
// then it replaces on stack top saved original instance
// of the object.
if (callResult instanceof Scriptable) {
frame.stack[frame.savedStackTop] = callResult;
}
} else {
Kit.codeBug();
}
frame.savedCallOp = 0;
}
public static NativeContinuation captureContinuation(Context cx) {
if (cx.lastInterpreterFrame == null ||
!(cx.lastInterpreterFrame instanceof CallFrame))
{
throw new IllegalStateException("Interpreter frames not found");
}
return captureContinuation(cx, (CallFrame)cx.lastInterpreterFrame, true);
}
private static NativeContinuation captureContinuation(Context cx, CallFrame frame,
boolean requireContinuationsTopFrame)
{
NativeContinuation c = new NativeContinuation();
ScriptRuntime.setObjectProtoAndParent(
c, ScriptRuntime.getTopCallScope(cx));
// Make sure that all frames are frozen
CallFrame x = frame;
CallFrame outermost = frame;
while (x != null && !x.frozen) {
x.frozen = true;
// Allow to GC unused stack space
for (int i = x.savedStackTop + 1; i != x.stack.length; ++i) {
// Allow to GC unused stack space
x.stack[i] = null;
x.stackAttributes[i] = ScriptableObject.EMPTY;
}
if (x.savedCallOp == Token.CALL) {
// the call will always overwrite the stack top with the result
x.stack[x.savedStackTop] = null;
} else {
if (x.savedCallOp != Token.NEW) Kit.codeBug();
// the new operator uses stack top to store the constructed
// object so it shall not be cleared: see comments in
// setCallResult
}
outermost = x;
x = x.parentFrame;
}
if (requireContinuationsTopFrame) {
while (outermost.parentFrame != null)
outermost = outermost.parentFrame;
if (!outermost.isContinuationsTopFrame) {
throw new IllegalStateException("Cannot capture continuation " +
"from JavaScript code not called directly by " +
"executeScriptWithContinuations or " +
"callFunctionWithContinuations");
}
}
c.initImplementation(frame);
return c;
}
private static int stack_int32(CallFrame frame, int i)
{
Object x = frame.stack[i];
double value;
if (x == UniqueTag.DOUBLE_MARK) {
value = frame.sDbl[i];
} else {
value = ScriptRuntime.toNumber(x);
}
return ScriptRuntime.toInt32(value);
}
private static double stack_double(CallFrame frame, int i)
{
Object x = frame.stack[i];
if (x != UniqueTag.DOUBLE_MARK) {
return ScriptRuntime.toNumber(x);
} else {
return frame.sDbl[i];
}
}
private static boolean stack_boolean(CallFrame frame, int i)
{
Object x = frame.stack[i];
if (x == Boolean.TRUE) {
return true;
} else if (x == Boolean.FALSE) {
return false;
} else if (x == UniqueTag.DOUBLE_MARK) {
double d = frame.sDbl[i];
return d == d && d != 0.0;
} else if (x == null || x == Undefined.instance) {
return false;
} else if (x instanceof Number) {
double d = ((Number)x).doubleValue();
return (d == d && d != 0.0);
} else if (x instanceof Boolean) {
return ((Boolean)x).booleanValue();
} else {
return ScriptRuntime.toBoolean(x);
}
}
private static void do_add(Object[] stack, double[] sDbl, int stackTop,
Context cx)
{
Object rhs = stack[stackTop + 1];
Object lhs = stack[stackTop];
double d;
boolean leftRightOrder;
if (rhs == UniqueTag.DOUBLE_MARK) {
d = sDbl[stackTop + 1];
if (lhs == UniqueTag.DOUBLE_MARK) {
sDbl[stackTop] += d;
return;
}
leftRightOrder = true;
// fallthrough to object + number code
} else if (lhs == UniqueTag.DOUBLE_MARK) {
d = sDbl[stackTop];
lhs = rhs;
leftRightOrder = false;
// fallthrough to object + number code
} else {
if (lhs instanceof Scriptable || rhs instanceof Scriptable) {
stack[stackTop] = ScriptRuntime.add(lhs, rhs, cx);
} else if (lhs instanceof String) {
String lstr = (String)lhs;
String rstr = ScriptRuntime.toString(rhs);
stack[stackTop] = lstr.concat(rstr);
} else if (rhs instanceof String) {
String lstr = ScriptRuntime.toString(lhs);
String rstr = (String)rhs;
stack[stackTop] = lstr.concat(rstr);
} else {
double lDbl = (lhs instanceof Number)
? ((Number)lhs).doubleValue() : ScriptRuntime.toNumber(lhs);
double rDbl = (rhs instanceof Number)
? ((Number)rhs).doubleValue() : ScriptRuntime.toNumber(rhs);
stack[stackTop] = UniqueTag.DOUBLE_MARK;
sDbl[stackTop] = lDbl + rDbl;
}
return;
}
// handle object(lhs) + number(d) code
if (lhs instanceof Scriptable) {
rhs = ScriptRuntime.wrapNumber(d);
if (!leftRightOrder) {
Object tmp = lhs;
lhs = rhs;
rhs = tmp;
}
stack[stackTop] = ScriptRuntime.add(lhs, rhs, cx);
} else if (lhs instanceof String) {
String lstr = (String)lhs;
String rstr = ScriptRuntime.toString(d);
if (leftRightOrder) {
stack[stackTop] = lstr.concat(rstr);
} else {
stack[stackTop] = rstr.concat(lstr);
}
} else {
double lDbl = (lhs instanceof Number)
? ((Number)lhs).doubleValue() : ScriptRuntime.toNumber(lhs);
stack[stackTop] = UniqueTag.DOUBLE_MARK;
sDbl[stackTop] = lDbl + d;
}
}
private static Object[] getArgsArray(Object[] stack, double[] sDbl,
int shift, int count)
{
if (count == 0) {
return ScriptRuntime.emptyArgs;
}
Object[] args = new Object[count];
for (int i = 0; i != count; ++i, ++shift) {
Object val = stack[shift];
if (val == UniqueTag.DOUBLE_MARK) {
val = ScriptRuntime.wrapNumber(sDbl[shift]);
}
args[i] = val;
}
return args;
}
private static void addInstructionCount(Context cx, CallFrame frame,
int extra)
{
cx.instructionCount += frame.pc - frame.pcPrevBranch + extra;
if (cx.instructionCount > cx.instructionThreshold) {
cx.observeInstructionCount(cx.instructionCount);
cx.instructionCount = 0;
}
}
}
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