// Copyright 2003-2008 Novell, Inc.
//
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Reflection;
+using System.Reflection.Emit;
+
namespace Mono.CSharp {
- using System;
- using System.Collections;
- using System.Diagnostics;
- using System.Reflection;
- using System.Reflection.Emit;
//
// A container class for all the conversion operations
static Type TypeParam_EffectiveBaseType (GenericConstraints gc)
{
- ArrayList list = new ArrayList ();
+ var list = new List<Type> ();
list.Add (gc.EffectiveBaseClass);
foreach (Type t in gc.InterfaceConstraints) {
if (!TypeManager.IsGenericParameter (t))
//
NullLiteral nl = expr as NullLiteral;
if (nl != null) {
- return nl.ConvertImplicitly(target_type);
+ return nl.ConvertImplicitly (null, target_type);
}
if (ImplicitReferenceConversionExists (expr, target_type)) {
if (expr_type == TypeManager.null_type)
return ec == null ? EmptyExpression.Null : Nullable.LiftedNull.Create (target_type, expr.Location);
- Type target = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type)[0]);
- Expression e;
+ // S -> T?
+ Type t_el = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (target_type)[0]);
// S? -> T?
- if (TypeManager.IsNullableType (expr_type)) {
- Type etype = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (expr_type)[0]);
+ if (TypeManager.IsNullableType (expr_type))
+ expr_type = TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (expr_type)[0]);
- if (ec == null)
- return ImplicitConversionExists (ec, new EmptyExpression (etype), target) ? EmptyExpression.Null : null;
+ //
+ // Predefined implicit identity or implicit numeric conversion
+ // has to exist between underlying type S and underlying type T
+ //
- Expression unwrap = Nullable.Unwrap.Create (expr);
- e = ImplicitConversion (ec, unwrap, target, expr.Location);
- if (e == null)
- return null;
+ // Handles probing
+ if (ec == null) {
+ if (expr_type == t_el)
+ return EmptyExpression.Null;
- return new Nullable.Lifted (e, unwrap, target_type).Resolve (ec);
+ return ImplicitNumericConversion (null, expr_type, t_el);
}
- // S -> T?
- if (ec == null)
- return ImplicitConversionExists (ec, expr, target) ? EmptyExpression.Null : null;
+ Expression unwrap;
+ if (expr_type != expr.Type)
+ unwrap = Nullable.Unwrap.Create (expr);
+ else
+ unwrap = expr;
- e = ImplicitConversion (ec, expr, target, expr.Location);
- if (e != null)
- return Nullable.Wrap.Create (e, target_type);
+ Expression conv = expr_type == t_el ? unwrap : ImplicitNumericConversion (unwrap, expr_type, t_el);
+ if (conv == null)
+ return null;
- return null;
+ if (expr_type != expr.Type)
+ return new Nullable.Lifted (conv, unwrap, target_type).Resolve (ec);
+
+ // Do constant optimization for S -> T?
+ if (unwrap is Constant)
+ conv = ((Constant) unwrap).ConvertImplicitly (ec, t_el);
+
+ return Nullable.Wrap.Create (conv, target_type);
}
/// <summary>
return ImplicitUserConversion (ec, expr, target_type, Location.Null) != null;
}
- public static bool ImplicitUserConversionExists (ResolveContext ec, Type source, Type target)
- {
- return ImplicitUserConversion (ec, new EmptyExpression (source), target, Location.Null) != null;
- }
-
/// <summary>
/// Determines if a standard implicit conversion exists from
/// expr_type to target_type
if (expr_type == TypeManager.null_type) {
NullLiteral nl = expr as NullLiteral;
if (nl != null)
- return nl.ConvertImplicitly (target_type) != null;
+ return nl.ConvertImplicitly (null, target_type) != null;
}
if (expr_type == TypeManager.void_type)
return true;
}
- if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
+ if (value == 0 && TypeManager.IsEnumType (target_type))
return true;
}
/// Finds "most encompassed type" according to the spec (13.4.2)
/// amongst the methods in the MethodGroupExpr
/// </summary>
- static Type FindMostEncompassedType (ArrayList types)
+ static Type FindMostEncompassedType (IList<Type> types)
{
Type best = null;
/// Finds "most encompassing type" according to the spec (13.4.2)
/// amongst the types in the given set
/// </summary>
- static Type FindMostEncompassingType (ArrayList types)
+ static Type FindMostEncompassingType (IList<Type> types)
{
Type best = null;
return null;
if (types.Count == 1)
- return (Type) types [0];
+ return types [0];
EmptyExpression expr = EmptyExpression.Grab ();
/// by making use of FindMostEncomp* methods. Applies the correct rules separately
/// for explicit and implicit conversion operators.
/// </summary>
- static public Type FindMostSpecificSource (IList list,
+ static public Type FindMostSpecificSource (IList<MethodInfo> list,
Expression source, bool apply_explicit_conv_rules)
{
- ArrayList src_types_set = new ArrayList ();
+ var src_types_set = new List<Type> ();
//
// If any operator converts from S then Sx = S
// Explicit Conv rules
//
if (apply_explicit_conv_rules) {
- ArrayList candidate_set = new ArrayList ();
+ var candidate_set = new List<Type> ();
foreach (Type param_type in src_types_set){
if (ImplicitStandardConversionExists (source, param_type))
/// <summary>
/// Finds the most specific target Tx according to section 13.4.4
/// </summary>
- static public Type FindMostSpecificTarget (IList list,
+ static public Type FindMostSpecificTarget (IList<MethodInfo> list,
Type target, bool apply_explicit_conv_rules)
{
- ArrayList tgt_types_set = new ArrayList ();
+ var tgt_types_set = new List<Type> ();
//
// If any operator converts to T then Tx = T
// Explicit conv rules
//
if (apply_explicit_conv_rules) {
- ArrayList candidate_set = new ArrayList ();
+ var candidate_set = new List<Type> ();
EmptyExpression expr = EmptyExpression.Grab ();
static public Expression ImplicitUserConversion (ResolveContext ec, Expression source,
Type target, Location loc)
{
- Expression expr = UserDefinedConversion (ec, source, target, loc, false);
- if (expr != null && !TypeManager.IsEqual (expr.Type, target))
- expr = ImplicitConversionStandard (ec, expr, target, loc);
-
- return expr;
+ return UserDefinedConversion (ec, source, target, loc, false, true);
}
/// <summary>
/// User-defined Explicit conversions
/// </summary>
- static public Expression ExplicitUserConversion (ResolveContext ec, Expression source,
+ static Expression ExplicitUserConversion (ResolveContext ec, Expression source,
Type target, Location loc)
{
- Expression expr = UserDefinedConversion (ec, source, target, loc, true);
- if (expr != null && !TypeManager.IsEqual (expr.Type, target))
- expr = ExplicitConversionStandard (ec, expr, target, loc);
-
- return expr;
+ return UserDefinedConversion (ec, source, target, loc, true, true);
}
- static void AddConversionOperators (ArrayList list,
+ static void AddConversionOperators (List<MethodInfo> list,
Expression source, Type target_type,
bool look_for_explicit,
MethodGroupExpr mg)
/// </summary>
static MethodInfo GetConversionOperator (CompilerContext ctx, Type container_type, Expression source, Type target_type, bool look_for_explicit)
{
- ArrayList ops = new ArrayList (4);
+ var ops = new List<MethodInfo> (4);
Type source_type = source.Type;
/// <summary>
/// User-defined conversions
/// </summary>
- static public Expression UserDefinedConversion (ResolveContext ec, Expression source,
+ public static Expression UserDefinedConversion (ResolveContext ec, Expression source,
Type target, Location loc,
- bool look_for_explicit)
+ bool look_for_explicit, bool return_convert)
{
Type source_type = source.Type;
MethodInfo method = null;
+ Expression expr = null;
object o;
DoubleHash hash;
if (TypeManager.IsDynamicType (source_type))
return null;
- method = GetConversionOperator (RootContext.ToplevelTypes.Compiler, null, source, target, look_for_explicit);
- if (!(source is Constant))
- hash.Insert (source_type, target, method);
+ method = GetConversionOperator (ec.Compiler, null, source, target, look_for_explicit);
}
- if (method == null)
- return null;
+ if (method != null) {
+ Type most_specific_source = TypeManager.GetParameterData (method).Types[0];
- Type most_specific_source = TypeManager.GetParameterData (method).Types [0];
+ //
+ // This will do the conversion to the best match that we
+ // found. Now we need to perform an implict standard conversion
+ // if the best match was not the type that we were requested
+ // by target.
+ //
+ if (look_for_explicit) {
+ ReportPrinter temp = new SessionReportPrinter ();
+ ReportPrinter prev = ec.Report.SetPrinter (temp);
- //
- // This will do the conversion to the best match that we
- // found. Now we need to perform an implict standard conversion
- // if the best match was not the type that we were requested
- // by target.
- //
- if (look_for_explicit)
- source = ExplicitConversionStandard (ec, source, most_specific_source, loc);
- else
- source = ImplicitConversionStandard (ec, source, most_specific_source, loc);
+ expr = ExplicitConversionStandard (ec, source, most_specific_source, loc);
- if (source == null)
- return null;
+ ec.Report.SetPrinter (prev);
+ if (temp.ErrorsCount != 0)
+ expr = null;
+ } else {
+ if (ImplicitStandardConversionExists (source, most_specific_source))
+ expr = ImplicitConversionStandard (ec, source, most_specific_source, loc);
+ else
+ expr = null;
+ }
+ }
+
+ if (expr == null) {
+ bool nullable = false;
- return new UserCast (method, source, loc).DoResolve (ec);
+ if (TypeManager.IsNullableType (source_type)) {
+ source = Nullable.Unwrap.Create (source);
+ nullable = true;
+ }
+
+ Type target_underlying;
+ if (TypeManager.IsNullableType (target)) {
+ target_underlying = TypeManager.GetTypeArguments (target)[0];
+ nullable = true;
+ } else {
+ // No implicit conversion S? -> T for non-reference type T
+ if (!look_for_explicit && !TypeManager.IsReferenceType (target))
+ nullable = false;
+
+ target_underlying = target;
+ }
+
+ if (nullable) {
+ expr = UserDefinedConversion (ec, source, target_underlying, loc, look_for_explicit, return_convert);
+
+ // Do result expression lifting only when it's needed
+ if (expr != null && (!look_for_explicit || TypeManager.IsReferenceType (target)))
+ expr = new Nullable.Lifted (expr, source, target).Resolve (ec);
+
+ return expr;
+ }
+ } else {
+ expr = new UserCast (method, expr, loc).Resolve (ec);
+
+ if (return_convert && !TypeManager.IsEqual (expr.Type, target)) {
+ if (look_for_explicit) {
+ expr = ExplicitConversionStandard (ec, expr, target, loc);
+ } else {
+ expr = ImplicitConversionStandard (ec, expr, target, loc);
+ }
+ }
+ }
+
+ if (!(source is Constant))
+ hash.Insert (source_type, target, method);
+
+ return expr;
}
/// <summary>
Constant c = expr as Constant;
if (c != null) {
try {
- c = c.ConvertImplicitly (target_type);
+ c = c.ConvertImplicitly (ec, target_type);
} catch {
Console.WriteLine ("Conversion error happened in line {0}", loc);
throw;
// type is an enum-type
//
if (i.IsDefaultValue)
- return new EnumConstant (i, target_type);
+ return new EnumConstant (i, target_type).Resolve (ec);
}
if (ec.IsUnsafe) {
AnonymousMethodExpression ame = (AnonymousMethodExpression) expr;
Expression am = ame.Compatible (ec, target_type);
if (am != null)
- return am.DoResolve (ec);
+ return am.Resolve (ec);
}
if (expr_type == InternalType.Arglist && target_type == TypeManager.arg_iterator_type)
if (e != null)
return e;
+ if (TypeManager.IsDynamicType (source.Type)) {
+ Arguments args = new Arguments (1);
+ args.Add (new Argument (source));
+ return new DynamicConversion (target_type, 0, args, loc).Resolve (ec);
+ }
+
source.Error_ValueCannotBeConverted (ec, loc, target_type, false);
return null;
}
if (expr_type == TypeManager.ushort_type ||
expr_type == TypeManager.uint32_type ||
- expr_type == TypeManager.uint64_type || expr_type == TypeManager.int64_type ||
expr_type == TypeManager.byte_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
+
+ if (expr_type == TypeManager.int64_type)
+ return new ConvCast (expr, target_type, ConvCast.Mode.I8_I);
+
+ if (expr_type == TypeManager.uint64_type)
+ return new ConvCast (expr, target_type, ConvCast.Mode.U8_I);
}
if (expr_type.IsPointer){
if (target_type == TypeManager.sbyte_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- else if (target_type == TypeManager.byte_type)
+ if (target_type == TypeManager.byte_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- else if (target_type == TypeManager.short_type)
+ if (target_type == TypeManager.short_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- else if (target_type == TypeManager.ushort_type)
+ if (target_type == TypeManager.ushort_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- else if (target_type == TypeManager.int32_type)
+ if (target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- else if (target_type == TypeManager.uint32_type)
+ if (target_type == TypeManager.uint32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- else if (target_type == TypeManager.uint64_type || target_type == TypeManager.int64_type)
+ if (target_type == TypeManager.int64_type)
+ return new ConvCast (expr, target_type, ConvCast.Mode.I_I8);
+ if (target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
}
return null;
Type target_type, Location loc)
{
Expression e = ExplicitConversionCore (ec, expr, target_type, loc);
- if (e != null)
+ if (e != null) {
+ //
+ // Don't eliminate explicit precission casts
+ //
+ if (e == expr) {
+ if (target_type == TypeManager.float_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+
+ if (target_type == TypeManager.double_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ }
+
return e;
+ }
Type expr_type = expr.Type;
if (TypeManager.IsNullableType (target_type)) {
if (ImplicitBoxingConversionExists (e, target_type, out use_class_cast))
return new BoxedCast (expr, target_type);
- e = ExplicitConversion (ec, e, target_type, loc);
+ e = ExplicitConversionCore (ec, e, target_type, loc);
if (e != null)
- e = EmptyCast.Create (e, target_type);
- return e;
+ return EmptyCast.Create (e, target_type);
}
e = ExplicitUserConversion (ec, expr, target_type, loc);
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