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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.CompilerServices;
using Microsoft.Scripting.Utils;
using System.Diagnostics;
namespace Microsoft.Scripting.Interpreter {
public class InterpretedFrame {
internal readonly Interpreter Interpreter;
public InterpretedFrame Parent;
public readonly object[] Data;
public readonly StrongBox<object>[] Closure;
public int StackIndex;
public int InstructionIndex;
public int FaultingInstruction; // the last instruction to cause a fault
// When a ThreadAbortException is raised from interpreted code this is the first frame that caught it.
// No handlers within this handler re-abort the current thread when left.
public ExceptionHandler CurrentAbortHandler;
internal InterpretedFrame(Interpreter interpreter, StrongBox<object>[] closure) {
Interpreter = interpreter;
StackIndex = interpreter._numberOfLocals;
Data = new object[interpreter._numberOfLocals + interpreter._maxStackDepth];
Closure = closure;
}
internal void BoxLocals() {
bool[] boxedLocals = Interpreter._localIsBoxed;
if (boxedLocals != null) {
for (int i = 0; i < boxedLocals.Length; i++) {
if (boxedLocals[i]) {
Data[i] = new StrongBox<object>(Data[i]);
}
}
}
}
public static bool IsInterpretedFrame(MethodBase method) {
ContractUtils.RequiresNotNull(method, "method");
return method.DeclaringType == typeof(Interpreter) && method.Name == "Run";
}
public DebugInfo GetDebugInfo(int instructionIndex) {
return DebugInfo.GetMatchingDebugInfo(Interpreter._debugInfos, instructionIndex);
}
public LambdaExpression Lambda {
get { return Interpreter._lambda; }
}
public void Push(object value) {
Data[StackIndex++] = value;
}
public object Pop() {
return Data[--StackIndex];
}
internal void SetStackDepth(int depth) {
StackIndex = Interpreter._numberOfLocals + depth;
}
public object Peek() {
return Data[StackIndex - 1];
}
#if DEBUG
internal string[] Trace {
get {
var trace = new List<string>();
var frame = this;
do {
trace.Add(frame.Lambda.Name);
frame = frame.Parent;
} while (frame != null);
return trace.ToArray();
}
}
#endif
}
}
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