|
public BeginExceptionBlock ( ) : |
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| return | ||
public static void EmitUnpackerBeginReadSubtree( TracingILGenerator il, int unpackerArgumentIndex, LocalBuilder subtreeUnpacker )
{
Contract.Requires( il != null );
Contract.Requires( unpackerArgumentIndex >= 0 );
Contract.Requires( subtreeUnpacker != null );
/*
* subtreeUnpacker = unpacker.ReadSubtree()
*/
il.EmitAnyLdarg( unpackerArgumentIndex );
il.EmitAnyCall( Metadata._Unpacker.ReadSubtree );
il.EmitAnyStloc( subtreeUnpacker );
il.BeginExceptionBlock();
}
/// <summary>
/// Emits the deserialize value.
/// </summary>
/// <param name="emitter">The emitter.</param>
/// <param name="il">The il generator.</param>
/// <param name="unpackerArgumentIndex">Index of the unpacker argument.</param>
/// <param name="value">The value local variable which stores unpacked value.</param>
/// <param name="targetType">The type of deserialzing type.</param>
/// <param name="member">The metadata for nil implication. Specify <c>null</c> if nil implication is not needed.</param>
/// <param name="memberName">The name of the member.</param>
/// <param name="endOfDeserialization">The end of deserialization label for nil implication.</param>
/// <param name="localHolder">The <see cref="LocalVariableHolder"/> which holds shared local variable information.</param>
private static void EmitDeserializeValueCore( SerializerEmitter emitter, TracingILGenerator il, int unpackerArgumentIndex, LocalBuilder value, Type targetType, SerializingMember? member, string memberName, Label endOfDeserialization, LocalVariableHolder localHolder )
{
var directUnpacking = Metadata._Unpacker.GetDirectReadMethod( value.LocalType );
if ( directUnpacking != null && ( member == null || !UnpackHelpers.IsReadOnlyAppendableCollectionMember( member.Value.Member ) ) )
{
var isSuccess = localHolder.IsDeserializationSucceeded;
il.EmitLdc_I4_0();
il.EmitAnyStloc( isSuccess );
il.BeginExceptionBlock();
il.EmitAnyLdarg( unpackerArgumentIndex );
il.EmitAnyLdloca( value );
il.EmitAnyCall( directUnpacking );
il.EmitAnyStloc( isSuccess );
il.BeginCatchBlock( typeof( MessageTypeException ) );
var ex = localHolder.GetCatchedException( typeof( MessageTypeException ) );
il.EmitAnyStloc( ex );
il.EmitTypeOf( targetType );
il.EmitLdstr( memberName );
il.EmitAnyLdloc( ex );
il.EmitAnyCall( SerializationExceptions.NewFailedToDeserializeMemberMethod );
il.EmitThrow();
il.EndExceptionBlock();
var endIf0 = il.DefineLabel( "END_IF" );
il.EmitAnyLdloc( isSuccess );
il.EmitBrtrue_S( endIf0 );
il.EmitAnyCall( SerializationExceptions.NewUnexpectedEndOfStreamMethod );
il.EmitThrow();
il.MarkLabel( endIf0 );
if ( member != null )
{
// If null, nil implication is NOT needed.
EmitNilImplicationForPrimitive( il, member.Value, value, endOfDeserialization );
}
}
else
{
EmitGeneralRead( il, unpackerArgumentIndex );
if ( member != null )
{
// If null, nil implication is NOT needed.
EmitNilImplication(
il,
unpackerArgumentIndex,
member.Value.Contract.Name,
member.Value.Contract.NilImplication,
endOfDeserialization,
localHolder
);
}
var thenIffCollection = il.DefineLabel( "THEN_IF_COLLECTION" );
var endIfCollection = il.DefineLabel( "END_IF_COLLECTION" );
/*
* if( !unpacker.IsArrayHeader && !unpacker.IsMapHeader )
* {
* value = GET_SERIALIZER().UnpackFrom( unpacker );
* }
* else
* {
* using( var subtreeUnpacker = unpacker.ReadSubtree() )
* {
* value = GET_SERIALIZER().UnpackFrom( subtreeUnpacker );
* }
* }
*/
il.EmitAnyLdarg( unpackerArgumentIndex );
il.EmitGetProperty( Metadata._Unpacker.IsArrayHeader );
il.EmitAnyLdarg( unpackerArgumentIndex );
il.EmitGetProperty( Metadata._Unpacker.IsMapHeader );
il.EmitOr();
il.EmitBrtrue_S( thenIffCollection );
EmitUnpackFrom( emitter, il, value, unpackerArgumentIndex );
il.EmitBr_S( endIfCollection );
var subtreeUnpacker = localHolder.SubtreeUnpacker;
il.MarkLabel( thenIffCollection );
EmitUnpackerBeginReadSubtree( il, unpackerArgumentIndex, subtreeUnpacker );
EmitUnpackFrom( emitter, il, value, subtreeUnpacker );
EmitUnpackerEndReadSubtree( il, subtreeUnpacker );
il.MarkLabel( endIfCollection );
}
}
/// <summary>
/// Emits 'foreach' statement on the IL stream.
/// </summary>
/// <param name="il">IL generator to be emitted to.</param>
/// <param name="traits"><see cref="CollectionTraits"/> which contains traits of the iterating collection.</param>
/// <param name="collection">'collection' argument index.</param>
/// <param name="bodyEmitter">Delegate to emit body statement.</param>
public static void EmitForEach( TracingILGenerator il, CollectionTraits traits, LocalBuilder collection, Action<TracingILGenerator, Action> bodyEmitter )
{
Contract.Requires( il != null );
Contract.Requires( collection != null );
Contract.Requires( bodyEmitter != null );
var enumerator = il.DeclareLocal( traits.GetEnumeratorMethod.ReturnType, "enumerator" );
// gets enumerator
if ( collection.LocalType.IsValueType )
{
il.EmitAnyLdloca( collection );
}
else
{
il.EmitAnyLdloc( collection );
}
il.EmitAnyCall( traits.GetEnumeratorMethod );
il.EmitAnyStloc( enumerator );
if ( typeof( IDisposable ).IsAssignableFrom( traits.GetEnumeratorMethod.ReturnType ) )
{
il.BeginExceptionBlock();
}
var startLoop = il.DefineLabel( "START_LOOP" );
il.MarkLabel( startLoop );
var endLoop = il.DefineLabel( "END_LOOP" );
var enumeratorType = traits.GetEnumeratorMethod.ReturnType;
MethodInfo moveNextMethod = enumeratorType.GetMethod( "MoveNext", Type.EmptyTypes );
PropertyInfo currentProperty = traits.GetEnumeratorMethod.ReturnType.GetProperty( "Current" );
if ( moveNextMethod == null )
{
moveNextMethod = Metadata._IEnumerator.MoveNext;
}
if ( currentProperty == null )
{
if ( enumeratorType == typeof( IDictionaryEnumerator ) )
{
currentProperty = Metadata._IDictionaryEnumerator.Current;
}
else if ( enumeratorType.IsInterface )
{
if ( enumeratorType.IsGenericType && enumeratorType.GetGenericTypeDefinition() == typeof( IEnumerator<> ) )
{
currentProperty = typeof( IEnumerator<> ).MakeGenericType( traits.ElementType ).GetProperty( "Current" );
}
else
{
currentProperty = Metadata._IEnumerator.Current;
}
}
}
Contract.Assert( currentProperty != null, enumeratorType.ToString() );
// iterates
if ( traits.GetEnumeratorMethod.ReturnType.IsValueType )
{
il.EmitAnyLdloca( enumerator );
}
else
{
il.EmitAnyLdloc( enumerator );
}
il.EmitAnyCall( moveNextMethod );
il.EmitBrfalse( endLoop );
bodyEmitter(
il,
() =>
{
if ( traits.GetEnumeratorMethod.ReturnType.IsValueType )
{
il.EmitAnyLdloca( enumerator );
}
else
{
il.EmitAnyLdloc( enumerator );
}
il.EmitGetProperty( currentProperty );
}
);
il.EmitBr( startLoop );
il.MarkLabel( endLoop );
// Dispose
if ( typeof( IDisposable ).IsAssignableFrom( traits.GetEnumeratorMethod.ReturnType ) )
{
il.BeginFinallyBlock();
if ( traits.GetEnumeratorMethod.ReturnType.IsValueType )
{
var disposeMethod = traits.GetEnumeratorMethod.ReturnType.GetMethod( "Dispose" );
if ( disposeMethod != null && disposeMethod.GetParameters().Length == 0 && disposeMethod.ReturnType == typeof( void ) )
{
il.EmitAnyLdloca( enumerator );
il.EmitAnyCall( disposeMethod );
}
else
{
il.EmitAnyLdloc( enumerator );
il.EmitBox( traits.GetEnumeratorMethod.ReturnType );
il.EmitAnyCall( Metadata._IDisposable.Dispose );
}
}
else
{
il.EmitAnyLdloc( enumerator );
il.EmitAnyCall( Metadata._IDisposable.Dispose );
}
il.EndExceptionBlock();
}
}
/// <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();
}