/// <summary>
/// Compiles the provided method code node while swapping it's body with a throwing stub.
/// </summary>
private bool TryCompileWithThrowingBody(MethodCodeNode methodNode, TypeSystemException exception)
{
MethodDesc helper;
Type exceptionType = exception.GetType();
if (exceptionType == typeof(TypeSystemException.TypeLoadException))
{
helper = _typeSystemContext.GetHelperEntryPoint("ThrowHelpers", "ThrowTypeLoadException");
}
else if (exceptionType == typeof(TypeSystemException.MissingFieldException))
{
helper = _typeSystemContext.GetHelperEntryPoint("ThrowHelpers", "ThrowMissingFieldException");
}
else if (exceptionType == typeof(TypeSystemException.MissingMethodException))
{
helper = _typeSystemContext.GetHelperEntryPoint("ThrowHelpers", "ThrowMissingMethodException");
}
else if (exceptionType == typeof(TypeSystemException.FileNotFoundException))
{
helper = _typeSystemContext.GetHelperEntryPoint("ThrowHelpers", "ThrowFileNotFoundException");
}
else if (exceptionType == typeof(TypeSystemException.InvalidProgramException))
{
helper = _typeSystemContext.GetHelperEntryPoint("ThrowHelpers", "ThrowInvalidProgramException");
}
else
{
return(false);
}
Debug.Assert(helper.Signature.Length == exception.Arguments.Count + 1);
var emitter = new Internal.IL.Stubs.ILEmitter();
var codeStream = emitter.NewCodeStream();
var infinityLabel = emitter.NewCodeLabel();
codeStream.EmitLabel(infinityLabel);
codeStream.EmitLdc((int)exception.StringID);
foreach (var arg in exception.Arguments)
{
codeStream.Emit(ILOpcode.ldstr, emitter.NewToken(arg));
}
codeStream.Emit(ILOpcode.call, emitter.NewToken(helper));
// The call will never return, but we still need to emit something. Emit a jump so that
// we don't have to bother balancing the stack if the method returns something.
codeStream.Emit(ILOpcode.br, infinityLabel);
_corInfo.CompileMethod(methodNode, emitter.Link(methodNode.Method));
return(true);
}