static bool IsVariableReset(ILNode expr, ILVariable variable)
{
object unused;
ILExpression ldloca;
return(expr.Match(ILCode.Initobj, out unused, out ldloca) && ldloca.MatchLdloca(variable));
}
static bool MatchStFld(ILNode stfld, ILVariable stateMachineVar, out FieldDef field, out ILExpression expr)
{
field = null;
IField fieldRef;
ILExpression ldloca;
if (!stfld.Match(ILCode.Stfld, out fieldRef, out ldloca, out expr))
return false;
field = fieldRef.ResolveFieldWithinSameModule();
return field != null && ldloca.MatchLdloca(stateMachineVar);
}
public static bool Match <T>(this ILNode node, ILCode code, out T operand, out ILExpression arg)
{
List <ILExpression> args;
if (node.Match(code, out operand, out args) && args.Count == 1)
{
arg = args[0];
return(true);
}
arg = null;
return(false);
}
static bool MatchStFld(ILNode stfld, ILVariable stateMachineVar, out FieldDefinition field, out ILExpression expr)
{
field = null;
FieldReference fieldRef;
ILExpression ldloca;
if (!stfld.Match(ILCode.Stfld, out fieldRef, out ldloca, out expr))
{
return(false);
}
field = fieldRef.ResolveWithinSameModule();
return(field != null && ldloca.MatchLdloca(stateMachineVar));
}
bool MatchStateAssignment(ILNode stfld, out int stateID)
{
// stfld(StateMachine::<>1__state, ldloc(this), ldc.i4(stateId))
stateID = 0;
IField fieldRef;
ILExpression target, val;
if (stfld.Match(ILCode.Stfld, out fieldRef, out target, out val)) {
return fieldRef.ResolveFieldWithinSameModule() == stateField
&& target.MatchThis()
&& val.Match(ILCode.Ldc_I4, out stateID);
}
return false;
}
public static bool MatchLdloc(this ILNode node, ILVariable expectedVar)
{
ILVariable v;
return(node.Match(ILCode.Ldloc, out v) && v == expectedVar);
}
public static bool MatchThis(this ILNode node)
{
ILVariable v;
return(node.Match(ILCode.Ldloc, out v) && v.IsParameter && v.OriginalParameter.Index == -1);
}
public static bool MatchLdcI4(this ILNode node, int expectedValue)
{
int v;
return(node.Match(ILCode.Ldc_I4, out v) && v == expectedValue);
}
public static bool MatchStloc(this ILNode node, ILVariable expectedVar, out ILExpression expr)
{
ILVariable v;
return(node.Match(ILCode.Stloc, out v, out expr) && v == expectedVar);
}
