/// <summary>
/// Emits gets <see cref="Unpacker.ItemsCount"/> with exception handling.
/// Note that final state is the value is pushed top of the evaluation stack.
/// </summary>
/// <param name="il">IL generator.</param>
/// <param name="unpackerArgumentIndex">Argument index of the unpacker.</param>
/// <param name="localHolder">The <see cref="LocalVariableHolder"/> which holds shared local variable information.</param>
public static void EmitGetUnpackerItemsCountAsInt32( TracingILGenerator il, int unpackerArgumentIndex, LocalVariableHolder localHolder )
{
Contract.Requires( il != null );
Contract.Requires( unpackerArgumentIndex >= 0 );
/*
* long rawItemsCount;
* try
* {
* rawItemsCount = unpacker.ItemsCount;
* }
* catch ( InvalidOperationException ex )
* {
* throw SerializationExceptions.NewIsIncorrectStream( ex );
* }
*
* if( rawItemsCount > Int32.MaxValue )
* {
* throw SerializationException.NewIsTooLargeCollection();
* }
*
* ... unchecked( ( int )rawItemsCount );
*/
il.EmitAnyLdloca( localHolder.RawItemsCount );
il.EmitInitobj( typeof( long ) );
il.BeginExceptionBlock();
il.EmitAnyLdarg( unpackerArgumentIndex );
il.EmitGetProperty( Metadata._Unpacker.ItemsCount );
il.EmitAnyStloc( localHolder.RawItemsCount );
il.BeginCatchBlock( typeof( InvalidOperationException ) );
il.EmitAnyCall( SerializationExceptions.NewIsIncorrectStreamMethod );
il.EmitThrow();
il.EndExceptionBlock();
il.EmitAnyLdloc( localHolder.RawItemsCount );
il.EmitLdc_I8( Int32.MaxValue );
var endIf = il.DefineLabel();
il.EmitBle_S( endIf );
il.EmitAnyCall( SerializationExceptions.NewIsTooLargeCollectionMethod );
il.EmitThrow();
il.MarkLabel( endIf );
il.EmitAnyLdloc( localHolder.RawItemsCount );
il.EmitConv_I4();
}