private static object InterpretLoop(Context cx, Interpreter.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
object DBL_MRK = UniqueTag.DOUBLE_MARK;
object undefined = Undefined.instance;
bool instructionCounting = (cx.instructionThreshold != 0);
// arbitrary number to add to instructionCount when calling
// other functions
int INVOCATION_COST = 100;
// arbitrary exception cost for instruction counting
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.
Interpreter.GeneratorState generatorState = null;
if (throwable != null)
{
if (throwable is Interpreter.GeneratorState)
{
generatorState = (Interpreter.GeneratorState)throwable;
// reestablish this call frame
EnterFrame(cx, frame, ScriptRuntime.emptyArgs, true);
throwable = null;
}
else
{
if (!(throwable is Interpreter.ContinuationJump))
{
// It should be continuation
Kit.CodeBug();
}
}
}
object interpreterResult = null;
double interpreterResultDbl = 0.0;
for (; ; )
{
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;
for (; ; )
{
// Exception handler assumes that PC is already incremented
// pass the instruction start when it searches the
// exception handler
int op = iCode[frame.pc++];
switch (op)
{
case Icode_GENERATOR:
{
// Back indent to ease implementation reading
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
Interpreter.CallFrame generatorFrame = CaptureFrameForGenerator(frame);
generatorFrame.frozen = true;
NativeGenerator generator = new NativeGenerator(frame.scope, generatorFrame.fnOrScript, generatorFrame);
frame.result = generator;
goto Loop_break;
}
goto case Token.YIELD;
}
case Token.YIELD:
{
// We are now resuming execution. Fall through to YIELD case.
// fall through...
if (!frame.frozen)
{
return FreezeGenerator(cx, frame, stackTop, generatorState);
}
else
{
object obj = ThawGenerator(frame, stackTop, generatorState, op);
if (obj != ScriptableConstants.NOT_FOUND)
{
throwable = obj;
goto withoutExceptions_break;
}
goto Loop_continue;
}
goto case Icode_GENERATOR_END;
}
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);
goto Loop_break;
}
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);
goto withoutExceptions_break;
}
case Token.RETHROW:
{
indexReg += frame.localShift;
throwable = stack[indexReg];
goto withoutExceptions_break;
}
case Token.GE:
case Token.LE:
case Token.GT:
case Token.LT:
{
stackTop = DoCompare(frame, op, stack, sDbl, stackTop);
goto Loop_continue;
}
case Token.IN:
case Token.INSTANCEOF:
{
stackTop = DoInOrInstanceof(cx, op, stack, sDbl, stackTop);
goto Loop_continue;
}
case Token.EQ:
case Token.NE:
{
--stackTop;
bool valBln = DoEquals(stack, sDbl, stackTop);
valBln ^= (op == Token.NE);
stack[stackTop] = ScriptRuntime.WrapBoolean(valBln);
goto Loop_continue;
}
case Token.SHEQ:
case Token.SHNE:
{
--stackTop;
bool valBln = DoShallowEquals(stack, sDbl, stackTop);
valBln ^= (op == Token.SHNE);
stack[stackTop] = ScriptRuntime.WrapBoolean(valBln);
goto Loop_continue;
}
case Token.IFNE:
{
if (Stack_boolean(frame, stackTop--))
{
frame.pc += 2;
goto Loop_continue;
}
goto jumplessRun_break;
}
case Token.IFEQ:
{
if (!Stack_boolean(frame, stackTop--))
{
frame.pc += 2;
goto Loop_continue;
}
goto jumplessRun_break;
}
case Icode_IFEQ_POP:
{
if (!Stack_boolean(frame, stackTop--))
{
frame.pc += 2;
goto Loop_continue;
}
stack[stackTop--] = null;
goto jumplessRun_break;
}
case Token.GOTO:
{
goto jumplessRun_break;
}
case Icode_GOSUB:
{
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = frame.pc + 2;
goto jumplessRun_break;
}
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();
}
}
goto Loop_continue;
}
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;
goto withoutExceptions_break;
}
// Normal return from GOSUB
frame.pc = (int)sDbl[indexReg];
if (instructionCounting)
{
frame.pcPrevBranch = frame.pc;
}
goto Loop_continue;
}
case Icode_POP:
{
stack[stackTop] = null;
stackTop--;
goto Loop_continue;
}
case Icode_POP_RESULT:
{
frame.result = stack[stackTop];
frame.resultDbl = sDbl[stackTop];
stack[stackTop] = null;
--stackTop;
goto Loop_continue;
}
case Icode_DUP:
{
stack[stackTop + 1] = stack[stackTop];
sDbl[stackTop + 1] = sDbl[stackTop];
stackTop++;
goto Loop_continue;
}
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;
goto Loop_continue;
}
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;
goto Loop_continue;
}
case Token.RETURN:
{
frame.result = stack[stackTop];
frame.resultDbl = sDbl[stackTop];
--stackTop;
goto Loop_break;
}
case Token.RETURN_RESULT:
{
goto Loop_break;
}
case Icode_RETUNDEF:
{
frame.result = undefined;
goto Loop_break;
}
case Token.BITNOT:
{
int rIntValue = Stack_int32(frame, stackTop);
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = ~rIntValue;
goto Loop_continue;
}
case Token.BITAND:
case Token.BITOR:
case Token.BITXOR:
case Token.LSH:
case Token.RSH:
{
stackTop = DoBitOp(frame, op, stack, sDbl, stackTop);
goto Loop_continue;
}
case Token.URSH:
{
double lDbl = Stack_double(frame, stackTop - 1);
int rIntValue = Stack_int32(frame, stackTop) & unchecked((int)(0x1F));
stack[--stackTop] = DBL_MRK;
sDbl[stackTop] = (long)(((ulong)ScriptRuntime.ToUint32(lDbl)) >> rIntValue);
goto Loop_continue;
}
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;
goto Loop_continue;
}
case Token.ADD:
{
--stackTop;
DoAdd(stack, sDbl, stackTop, cx);
goto Loop_continue;
}
case Token.SUB:
case Token.MUL:
case Token.DIV:
case Token.MOD:
{
stackTop = DoArithmetic(frame, op, stack, sDbl, stackTop);
goto Loop_continue;
}
case Token.NOT:
{
stack[stackTop] = ScriptRuntime.WrapBoolean(!Stack_boolean(frame, stackTop));
goto Loop_continue;
}
case Token.BINDNAME:
{
stack[++stackTop] = ScriptRuntime.Bind(cx, frame.scope, stringReg);
goto Loop_continue;
}
case Token.STRICT_SETNAME:
case Token.SETNAME:
{
object rhs = stack[stackTop];
if (rhs == DBL_MRK)
{
rhs = ScriptRuntime.WrapNumber(sDbl[stackTop]);
}
--stackTop;
Scriptable lhs = (Scriptable)stack[stackTop];
stack[stackTop] = op == Token.SETNAME ? ScriptRuntime.SetName(lhs, rhs, cx, frame.scope, stringReg) : ScriptRuntime.StrictSetName(lhs, rhs, cx, frame.scope, stringReg);
goto Loop_continue;
}
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);
goto Loop_continue;
}
case Token.DELPROP:
case Icode_DELNAME:
{
stackTop = DoDelName(cx, op, stack, sDbl, stackTop);
goto Loop_continue;
}
case Token.GETPROPNOWARN:
{
object lhs = stack[stackTop];
if (lhs == DBL_MRK)
{
lhs = ScriptRuntime.WrapNumber(sDbl[stackTop]);
}
stack[stackTop] = ScriptRuntime.GetObjectPropNoWarn(lhs, stringReg, cx);
goto Loop_continue;
}
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);
goto Loop_continue;
}
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);
goto Loop_continue;
}
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;
goto Loop_continue;
}
case Token.GETELEM:
{
stackTop = DoGetElem(cx, frame, stack, sDbl, stackTop);
goto Loop_continue;
}
case Token.SETELEM:
{
stackTop = DoSetElem(cx, stack, sDbl, stackTop);
goto Loop_continue;
}
case Icode_ELEM_INC_DEC:
{
stackTop = DoElemIncDec(cx, frame, iCode, stack, sDbl, stackTop);
goto Loop_continue;
}
case Token.GET_REF:
{
Ref @ref = (Ref)stack[stackTop];
stack[stackTop] = ScriptRuntime.RefGet(@ref, cx);
goto Loop_continue;
}
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);
goto Loop_continue;
}
case Token.DEL_REF:
{
Ref @ref = (Ref)stack[stackTop];
stack[stackTop] = ScriptRuntime.RefDel(@ref, cx);
goto Loop_continue;
}
case Icode_REF_INC_DEC:
{
Ref @ref = (Ref)stack[stackTop];
stack[stackTop] = ScriptRuntime.RefIncrDecr(@ref, cx, iCode[frame.pc]);
++frame.pc;
goto Loop_continue;
}
case Token.LOCAL_LOAD:
{
++stackTop;
indexReg += frame.localShift;
stack[stackTop] = stack[indexReg];
sDbl[stackTop] = sDbl[indexReg];
goto Loop_continue;
}
case Icode_LOCAL_CLEAR:
{
indexReg += frame.localShift;
stack[indexReg] = null;
goto Loop_continue;
}
case Icode_NAME_AND_THIS:
{
// stringReg: name
++stackTop;
stack[stackTop] = ScriptRuntime.GetNameFunctionAndThis(stringReg, cx, frame.scope);
++stackTop;
stack[stackTop] = ScriptRuntime.LastStoredScriptable(cx);
goto Loop_continue;
}
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);
goto Loop_continue;
}
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);
goto Loop_continue;
}
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);
goto Loop_continue;
}
case Icode_CALLSPECIAL:
{
if (instructionCounting)
{
cx.instructionCount += INVOCATION_COST;
}
stackTop = DoCallSpecial(cx, frame, stack, sDbl, stackTop, iCode, indexReg);
goto Loop_continue;
}
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);
goto Loop_continue;
}
Scriptable calleeScope = frame.scope;
if (frame.useActivation)
{
calleeScope = ScriptableObject.GetTopLevelScope(frame.scope);
}
if (fun is InterpretedFunction)
{
InterpretedFunction ifun = (InterpretedFunction)fun;
if (frame.fnOrScript.securityDomain == ifun.securityDomain)
{
Interpreter.CallFrame callParentFrame = frame;
Interpreter.CallFrame calleeFrame = new Interpreter.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;
goto StateLoop_continue;
}
}
if (fun is NativeContinuation)
{
// Jump to the captured continuation
Interpreter.ContinuationJump cjump;
cjump = new Interpreter.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;
goto withoutExceptions_break;
}
if (fun is IdFunctionObject)
{
IdFunctionObject ifun = (IdFunctionObject)fun;
if (NativeContinuation.IsContinuationConstructor(ifun))
{
frame.stack[stackTop] = CaptureContinuation(cx, frame.parentFrame, false);
goto Loop_continue;
}
// 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 is InterpretedFunction)
{
InterpretedFunction iApplyCallable = (InterpretedFunction)applyCallable;
if (frame.fnOrScript.securityDomain == iApplyCallable.securityDomain)
{
frame = InitFrameForApplyOrCall(cx, frame, indexReg, stack, sDbl, stackTop, op, calleeScope, ifun, iApplyCallable);
goto StateLoop_continue;
}
}
}
}
// Bug 447697 -- make best effort to keep __noSuchMethod__ within this
// interpreter loop invocation
if (fun is ScriptRuntime.NoSuchMethodShim)
{
// get the shim and the actual method
ScriptRuntime.NoSuchMethodShim noSuchMethodShim = (ScriptRuntime.NoSuchMethodShim)fun;
Callable noSuchMethodMethod = noSuchMethodShim.noSuchMethodMethod;
// if the method is in fact an InterpretedFunction
if (noSuchMethodMethod is InterpretedFunction)
{
InterpretedFunction ifun = (InterpretedFunction)noSuchMethodMethod;
if (frame.fnOrScript.securityDomain == ifun.securityDomain)
{
frame = InitFrameForNoSuchMethod(cx, frame, indexReg, stack, sDbl, stackTop, op, funThisObj, calleeScope, noSuchMethodShim, ifun);
goto StateLoop_continue;
}
}
}
cx.lastInterpreterFrame = frame;
frame.savedCallOp = op;
frame.savedStackTop = stackTop;
stack[stackTop] = fun.Call(cx, calleeScope, funThisObj, GetArgsArray(stack, sDbl, stackTop + 2, indexReg));
goto Loop_continue;
}
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 is InterpretedFunction)
{
InterpretedFunction f = (InterpretedFunction)lhs;
if (frame.fnOrScript.securityDomain == f.securityDomain)
{
Scriptable newInstance = f.CreateObject(cx, frame.scope);
Interpreter.CallFrame calleeFrame = new Interpreter.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;
goto StateLoop_continue;
}
}
if (!(lhs is Function))
{
if (lhs == DBL_MRK)
{
lhs = ScriptRuntime.WrapNumber(sDbl[stackTop]);
}
throw ScriptRuntime.NotFunctionError(lhs);
}
Function fun = (Function)lhs;
if (fun is IdFunctionObject)
{
IdFunctionObject ifun = (IdFunctionObject)fun;
if (NativeContinuation.IsContinuationConstructor(ifun))
{
frame.stack[stackTop] = CaptureContinuation(cx, frame.parentFrame, false);
goto Loop_continue;
}
}
object[] outArgs = GetArgsArray(stack, sDbl, stackTop + 1, indexReg);
stack[stackTop] = fun.Construct(cx, frame.scope, outArgs);
goto Loop_continue;
}
case Token.TYPEOF:
{
object lhs = stack[stackTop];
if (lhs == DBL_MRK)
{
lhs = ScriptRuntime.WrapNumber(sDbl[stackTop]);
}
stack[stackTop] = ScriptRuntime.Typeof(lhs);
goto Loop_continue;
}
case Icode_TYPEOFNAME:
{
stack[++stackTop] = ScriptRuntime.TypeofName(frame.scope, stringReg);
goto Loop_continue;
}
case Token.STRING:
{
stack[++stackTop] = stringReg;
goto Loop_continue;
}
case Icode_SHORTNUMBER:
{
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = GetShort(iCode, frame.pc);
frame.pc += 2;
goto Loop_continue;
}
case Icode_INTNUMBER:
{
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = GetInt(iCode, frame.pc);
frame.pc += 4;
goto Loop_continue;
}
case Token.NUMBER:
{
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = frame.idata.itsDoubleTable[indexReg];
goto Loop_continue;
}
case Token.NAME:
{
stack[++stackTop] = ScriptRuntime.Name(cx, frame.scope, stringReg);
goto Loop_continue;
}
case Icode_NAME_INC_DEC:
{
stack[++stackTop] = ScriptRuntime.NameIncrDecr(frame.scope, stringReg, cx, iCode[frame.pc]);
++frame.pc;
goto Loop_continue;
}
case Icode_SETCONSTVAR1:
{
indexReg = iCode[frame.pc++];
goto case Token.SETCONSTVAR;
}
case Token.SETCONSTVAR:
{
// fallthrough
stackTop = DoSetConstVar(frame, stack, sDbl, stackTop, vars, varDbls, varAttributes, indexReg);
goto Loop_continue;
}
case Icode_SETVAR1:
{
indexReg = iCode[frame.pc++];
goto case Token.SETVAR;
}
case Token.SETVAR:
{
// fallthrough
stackTop = DoSetVar(frame, stack, sDbl, stackTop, vars, varDbls, varAttributes, indexReg);
goto Loop_continue;
}
case Icode_GETVAR1:
{
indexReg = iCode[frame.pc++];
goto case Token.GETVAR;
}
case Token.GETVAR:
{
// fallthrough
stackTop = DoGetVar(frame, stack, sDbl, stackTop, vars, varDbls, indexReg);
goto Loop_continue;
}
case Icode_VAR_INC_DEC:
{
stackTop = DoVarIncDec(cx, frame, stack, sDbl, stackTop, vars, varDbls, indexReg);
goto Loop_continue;
}
case Icode_ZERO:
{
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = 0;
goto Loop_continue;
}
case Icode_ONE:
{
++stackTop;
stack[stackTop] = DBL_MRK;
sDbl[stackTop] = 1;
goto Loop_continue;
}
case Token.NULL:
{
stack[++stackTop] = null;
goto Loop_continue;
}
case Token.THIS:
{
stack[++stackTop] = frame.thisObj;
goto Loop_continue;
}
case Token.THISFN:
{
stack[++stackTop] = frame.fnOrScript;
goto Loop_continue;
}
case Token.FALSE:
{
stack[++stackTop] = false;
goto Loop_continue;
}
case Token.TRUE:
{
stack[++stackTop] = true;
goto Loop_continue;
}
case Icode_UNDEF:
{
stack[++stackTop] = undefined;
goto Loop_continue;
}
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);
goto Loop_continue;
}
case Token.LEAVEWITH:
{
frame.scope = ScriptRuntime.LeaveWith(frame.scope);
goto Loop_continue;
}
case Token.CATCH_SCOPE:
{
// stack top: exception object
// stringReg: name of exception variable
// indexReg: local for exception scope
--stackTop;
indexReg += frame.localShift;
bool afterFirstScope = (frame.idata.itsICode[frame.pc] != 0);
Exception caughtException = (Exception)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;
goto Loop_continue;
}
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);
goto Loop_continue;
}
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);
goto Loop_continue;
}
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);
goto Loop_continue;
}
case Token.REF_MEMBER:
{
//indexReg: flags
stackTop = DoRefMember(cx, stack, sDbl, stackTop, indexReg);
goto Loop_continue;
}
case Token.REF_NS_MEMBER:
{
//indexReg: flags
stackTop = DoRefNsMember(cx, stack, sDbl, stackTop, indexReg);
goto Loop_continue;
}
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);
goto Loop_continue;
}
case Token.REF_NS_NAME:
{
//indexReg: flags
stackTop = DoRefNsName(cx, frame, stack, sDbl, stackTop, indexReg);
goto Loop_continue;
}
case Icode_SCOPE_LOAD:
{
indexReg += frame.localShift;
frame.scope = (Scriptable)stack[indexReg];
goto Loop_continue;
}
case Icode_SCOPE_SAVE:
{
indexReg += frame.localShift;
stack[indexReg] = frame.scope;
goto Loop_continue;
}
case Icode_CLOSURE_EXPR:
{
stack[++stackTop] = InterpretedFunction.CreateFunction(cx, frame.scope, frame.fnOrScript, indexReg);
goto Loop_continue;
}
case Icode_CLOSURE_STMT:
{
InitFunction(cx, frame.scope, frame.fnOrScript, indexReg);
goto Loop_continue;
}
case Token.REGEXP:
{
object re = frame.idata.itsRegExpLiterals[indexReg];
stack[++stackTop] = ScriptRuntime.WrapRegExp(cx, frame.scope, re);
goto Loop_continue;
}
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;
goto Loop_continue;
}
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;
goto Loop_continue;
}
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;
goto Loop_continue;
}
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;
goto Loop_continue;
}
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;
goto Loop_continue;
}
case Icode_ENTERDQ:
{
object lhs = stack[stackTop];
if (lhs == DBL_MRK)
{
lhs = ScriptRuntime.WrapNumber(sDbl[stackTop]);
}
--stackTop;
frame.scope = ScriptRuntime.EnterDotQuery(lhs, frame.scope);
goto Loop_continue;
}
case Icode_LEAVEDQ:
{
bool 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;
goto Loop_continue;
}
// reset stack and PC to code after ENTERDQ
--stackTop;
goto jumplessRun_break;
}
case Token.DEFAULTNAMESPACE:
{
object value = stack[stackTop];
if (value == DBL_MRK)
{
value = ScriptRuntime.WrapNumber(sDbl[stackTop]);
}
stack[stackTop] = ScriptRuntime.SetDefaultNamespace(value, cx);
goto Loop_continue;
}
case Token.ESCXMLATTR:
{
object value = stack[stackTop];
if (value != DBL_MRK)
{
stack[stackTop] = ScriptRuntime.EscapeAttributeValue(value, cx);
}
goto Loop_continue;
}
case Token.ESCXMLTEXT:
{
object value = stack[stackTop];
if (value != DBL_MRK)
{
stack[stackTop] = ScriptRuntime.EscapeTextValue(value, cx);
}
goto Loop_continue;
}
case Icode_DEBUGGER:
{
if (frame.debuggerFrame != null)
{
frame.debuggerFrame.OnDebuggerStatement(cx);
}
goto Loop_continue;
}
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;
goto Loop_continue;
}
case Icode_REG_IND_C0:
{
indexReg = 0;
goto Loop_continue;
}
case Icode_REG_IND_C1:
{
indexReg = 1;
goto Loop_continue;
}
case Icode_REG_IND_C2:
{
indexReg = 2;
goto Loop_continue;
}
case Icode_REG_IND_C3:
{
indexReg = 3;
goto Loop_continue;
}
case Icode_REG_IND_C4:
{
indexReg = 4;
goto Loop_continue;
}
case Icode_REG_IND_C5:
{
indexReg = 5;
goto Loop_continue;
}
case Icode_REG_IND1:
{
indexReg = unchecked((int)(0xFF)) & iCode[frame.pc];
++frame.pc;
goto Loop_continue;
}
case Icode_REG_IND2:
{
indexReg = GetIndex(iCode, frame.pc);
frame.pc += 2;
goto Loop_continue;
}
case Icode_REG_IND4:
{
indexReg = GetInt(iCode, frame.pc);
frame.pc += 4;
goto Loop_continue;
}
case Icode_REG_STR_C0:
{
stringReg = strings[0];
goto Loop_continue;
}
case Icode_REG_STR_C1:
{
stringReg = strings[1];
goto Loop_continue;
}
case Icode_REG_STR_C2:
{
stringReg = strings[2];
goto Loop_continue;
}
case Icode_REG_STR_C3:
{
stringReg = strings[3];
goto Loop_continue;
}
case Icode_REG_STR1:
{
stringReg = strings[unchecked((int)(0xFF)) & iCode[frame.pc]];
++frame.pc;
goto Loop_continue;
}
case Icode_REG_STR2:
{
stringReg = strings[GetIndex(iCode, frame.pc)];
frame.pc += 2;
goto Loop_continue;
}
case Icode_REG_STR4:
{
stringReg = strings[GetInt(iCode, frame.pc)];
frame.pc += 4;
goto Loop_continue;
}
default:
{
DumpICode(frame.idata);
throw new Exception("Unknown icode : " + op + " @ pc : " + (frame.pc - 1));
}
}
jumplessRun_break: ;
// 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;
}
goto Loop_continue;
Loop_continue: ;
}
Loop_break: ;
// 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
goto StateLoop_continue;
}
goto StateLoop_break;
}
catch (Exception ex)
{
// end of interpreter withoutExceptions: try
if (throwable != null)
{
// This is serious bug and it is better to track it ASAP
Sharpen.Runtime.PrintStackTrace(ex, System.Console.Error);
throw new InvalidOperationException();
}
throwable = ex;
}
withoutExceptions_break: ;
// 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
int EX_CATCH_STATE = 2;
// Can execute JS catch
int EX_FINALLY_STATE = 1;
// Can execute JS finally
int EX_NO_JS_STATE = 0;
// Terminate JS execution
int exState;
Interpreter.ContinuationJump cjump_1 = null;
if (generatorState != null && generatorState.operation == NativeGenerator.GENERATOR_CLOSE && throwable == generatorState.value)
{
exState = EX_FINALLY_STATE;
}
else
{
if (throwable is JavaScriptException)
{
exState = EX_CATCH_STATE;
}
else
{
if (throwable is EcmaError)
{
// an offical ECMA error object,
exState = EX_CATCH_STATE;
}
else
{
if (throwable is EvaluatorException)
{
exState = EX_CATCH_STATE;
}
else
{
if (throwable is ContinuationPending)
{
exState = EX_NO_JS_STATE;
}
else
{
if (throwable is Exception)
{
exState = cx.HasFeature(Context.FEATURE_ENHANCED_JAVA_ACCESS) ? EX_CATCH_STATE : EX_FINALLY_STATE;
}
else
{
if (throwable is Exception)
{
exState = cx.HasFeature(Context.FEATURE_ENHANCED_JAVA_ACCESS) ? EX_CATCH_STATE : EX_NO_JS_STATE;
}
else
{
if (throwable is Interpreter.ContinuationJump)
{
// It must be ContinuationJump
exState = EX_FINALLY_STATE;
cjump_1 = (Interpreter.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 (Exception ex)
{
throwable = ex;
exState = EX_FINALLY_STATE;
}
catch (Exception ex)
{
// Error from instruction counting
// => unconditionally terminate JS
throwable = ex;
cjump_1 = null;
exState = EX_NO_JS_STATE;
}
}
if (frame.debuggerFrame != null && throwable is Exception)
{
// Call debugger only for RuntimeException
Exception rex = (Exception)throwable;
try
{
frame.debuggerFrame.OnExceptionThrown(cx, rex);
}
catch (Exception ex)
{
// Any exception from debugger
// => unconditionally terminate JS
throwable = ex;
cjump_1 = null;
exState = EX_NO_JS_STATE;
}
}
for (; ; )
{
if (exState != EX_NO_JS_STATE)
{
bool 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
goto StateLoop_continue;
}
}
// 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_1 != null && cjump_1.branchFrame == frame)
{
// Continuation branch point was hit,
// restart the state loop to reenter continuation
indexReg = -1;
goto StateLoop_continue;
}
}
// No more frames, rethrow the exception or deal with continuation
if (cjump_1 != null)
{
if (cjump_1.branchFrame != null)
{
// The above loop should locate the top frame
Kit.CodeBug();
}
if (cjump_1.capturedFrame != null)
{
// Restarting detached continuation
indexReg = -1;
goto StateLoop_continue;
}
// Return continuation result to the caller
interpreterResult = cjump_1.result;
interpreterResultDbl = cjump_1.resultDbl;
throwable = null;
}
goto StateLoop_break;
StateLoop_continue: ;
}
StateLoop_break: ;
// 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 is Exception)
{
throw (Exception)throwable;
}
else
{
// Must be instance of Error or code bug
throw (Exception)throwable;
}
}
return (interpreterResult != DBL_MRK) ? interpreterResult : ScriptRuntime.WrapNumber(interpreterResultDbl);
}
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];
}
Interpreter.CallFrame capturedFrame = (Interpreter.CallFrame)c.GetImplementation();
if (capturedFrame == null)
{
// No frames to restart
return arg;
}
Interpreter.ContinuationJump cjump = new Interpreter.ContinuationJump(c, null);
cjump.result = arg;
return InterpretLoop(cx, null, cjump);
}
