|
public Evaluate ( |
||
| context | ||
| Результат | object | |
private long GetValue(ScriptingContext context, Expression expr)
{
object val = expr.Evaluate (context);
again:
if (val is int)
return (long) (int) val;
else if (val is uint)
return (long) (uint) val;
else if (val is ulong)
return (long) (ulong) val;
else if (val is long)
return (long) val;
else if (val is TargetPointerObject) {
TargetPointerObject pobj = (TargetPointerObject) val;
return pobj.GetAddress (context.CurrentThread).Address;
} else if (val is TargetFundamentalObject) {
TargetFundamentalObject fobj = (TargetFundamentalObject) val;
val = fobj.GetObject (context.CurrentThread);
if (!(val is TargetFundamentalObject))
goto again;
}
throw new ScriptingException ("Cannot evaluate expression `{0}'", expr.Name);
}
protected override string Execute(ScriptingContext context,
Expression expression, DisplayFormat format)
{
if (NestedBreakStates)
context.ScriptingFlags |= ScriptingFlags.NestedBreakStates;
if (expression is TypeExpression)
throw new ScriptingException (
"`{0}' is a type, not a variable.", expression.Name);
object retval = expression.Evaluate (context);
string text = context.FormatObject (retval, format);
context.Print (text);
return text;
}
int GetIntIndex(Thread target, Expression index, ScriptingContext context)
{
try {
object idx = index.Evaluate (context);
if (idx is int)
return (int) idx;
else if (idx is long)
return (int) (long) idx;
TargetFundamentalObject obj = (TargetFundamentalObject) idx;
return (int) obj.GetObject (target);
} catch (Exception e) {
throw new ScriptingException (
"Cannot convert {0} to an integer for indexing: {1}",
index, e);
}
}
protected override string Execute(ScriptingContext context,
Expression expression, DisplayFormat format)
{
try {
if (expression is TypeExpression)
throw new ScriptingException (
"`{0}' is a type, not a variable.", expression.Name);
object retval = expression.Evaluate (context);
EmonicInterpreter.printData output = new EmonicInterpreter.printData();
output.type = "";
output.varValue = "";
output.varNames = "";
if (retval != null) {
output.type = ((TargetObject)retval).TypeName;
if (output.type == null)
output.type = "";
switch (((TargetObject)retval).Kind) {
case TargetObjectKind.Fundamental:
// we send the value of the fundamental type
TargetFundamentalObject tfo = retval as TargetFundamentalObject;
if (tfo == null) {
// element is "null"
output.varValue = "<null>";
break;
}
output.varValue = tfo.GetObject(context.CurrentThread).ToString();
if (output.varValue == null)
output.varValue = "";
break;
case TargetObjectKind.Array:
// we send back the number of array elements
TargetArrayObject tao = retval as TargetArrayObject;
if (tao == null) {
// element is "null"
output.varValue = "<null>";
break;
}
int lower = tao.GetLowerBound (context.CurrentThread, 0);
int upper = tao.GetUpperBound (context.CurrentThread, 0);
output.varNames = (upper-lower).ToString();
break;
// same for struct and class
case TargetObjectKind.Struct:
case TargetObjectKind.Class:
// we send back the member's names
// NOTE! we also show static and constant fields
TargetObject obj = retval as TargetObject;
if (obj.HasAddress && obj.GetAddress(context.CurrentThread).IsNull) {
output.varValue = "<null>";
break;
}
Mono.Debugger.Thread thread = context.CurrentThread;
TargetClass tc = ((TargetClassObject)retval).Type.GetClass(thread);
if (tc == null)
break;
TargetFieldInfo[] tfi = tc.GetFields(thread);
if (tfi == null)
break;
output.varNames = "";
for (int i=0; i<tfi.Length; i++) {
if (tfi[i].IsStatic) // do not show static fields, they're not accessible via the instance!
continue;
output.varNames += tfi[i].Name;
output.varNames += " ";
}
output.varNames = output.varNames.Trim();
break;
case TargetObjectKind.Object:
case TargetObjectKind.Pointer:
case TargetObjectKind.Unknown:
case TargetObjectKind.Function:
case TargetObjectKind.Alias:
case TargetObjectKind.Enum:
context.Print("ERROR: Print Command will return no values because of an implementation error");
break;
}
}
string text = context.FormatObject (retval, format);
context.Print (text);
EmonicInterpreter.printOutput = output;
EmonicInterpreter.printSem.Release();
return text;
} catch {
EmonicInterpreter.printData output = new EmonicInterpreter.printData();
output.type = "";
output.varValue = "";
output.varNames = "";
EmonicInterpreter.printOutput = output;
EmonicInterpreter.printSem.Release();
throw;
}
}
