//
// ecore.cs: Core of the Expression representation for the intermediate tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// Copyright 2001, 2002, 2003 Ximian, Inc.
// Copyright 2003-2008 Novell, Inc.
//
//
namespace Mono.CSharp {
using System;
using System.Collections;
using System.Diagnostics;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
using System.Collections.Generic;
#if NET_4_0
using SLE = System.Linq.Expressions;
#endif
/// <remarks>
/// The ExprClass class contains the is used to pass the
/// classification of an expression (value, variable, namespace,
/// type, method group, property access, event access, indexer access,
/// nothing).
/// </remarks>
public enum ExprClass : byte {
Invalid,
Value,
Variable,
Namespace,
Type,
TypeParameter,
MethodGroup,
PropertyAccess,
EventAccess,
IndexerAccess,
Nothing,
}
/// <remarks>
/// This is used to tell Resolve in which types of expressions we're
/// interested.
/// </remarks>
[Flags]
public enum ResolveFlags {
// Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
VariableOrValue = 1,
// Returns a type expression.
Type = 1 << 1,
// Returns a method group.
MethodGroup = 1 << 2,
TypeParameter = 1 << 3,
// Mask of all the expression class flags.
MaskExprClass = VariableOrValue | Type | MethodGroup | TypeParameter,
// Disable control flow analysis while resolving the expression.
// This is used when resolving the instance expression of a field expression.
DisableFlowAnalysis = 1 << 10,
// Set if this is resolving the first part of a MemberAccess.
Intermediate = 1 << 11,
// Disable control flow analysis _of struct_ while resolving the expression.
// This is used when resolving the instance expression of a field expression.
DisableStructFlowAnalysis = 1 << 12,
}
//
// This is just as a hint to AddressOf of what will be done with the
// address.
[Flags]
public enum AddressOp {
Store = 1,
Load = 2,
LoadStore = 3
};
/// <summary>
/// This interface is implemented by variables
/// </summary>
public interface IMemoryLocation {
/// <summary>
/// The AddressOf method should generate code that loads
/// the address of the object and leaves it on the stack.
///
/// The `mode' argument is used to notify the expression
/// of whether this will be used to read from the address or
/// write to the address.
///
/// This is just a hint that can be used to provide good error
/// reporting, and should have no other side effects.
/// </summary>
void AddressOf (EmitContext ec, AddressOp mode);
}
//
// An expressions resolved as a direct variable reference
//
public interface IVariableReference : IFixedExpression
{
bool IsHoisted { get; }
string Name { get; }
VariableInfo VariableInfo { get; }
void SetHasAddressTaken ();
}
//
// Implemented by an expression which could be or is always
// fixed
//
public interface IFixedExpression
{
bool IsFixed { get; }
}
/// <remarks>
/// Base class for expressions
/// </remarks>
public abstract class Expression: IVisitable {
public ExprClass eclass;
protected Type type;
protected Location loc;
public abstract IEnumerable<IVisitable> GetChildrenX(object context);
public abstract string GetNameX();
public virtual IEnumerable<IVisitable> GetChildren(object context)
{
return GetChildrenX(context);
}
public virtual string GetName()
{
return GetNameX();
}
public Type Type {
get { return type; }
set { type = value; }
}
public virtual Location Location {
get { return loc; }
}
// Not nice but we have broken hierarchy.
public virtual void CheckMarshalByRefAccess (ResolveContext ec)
{
}
public virtual bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
Attribute.Error_AttributeArgumentNotValid (ec, loc);
value = null;
return false;
}
public virtual string GetSignatureForError ()
{
return TypeManager.CSharpName (type);
}
public static bool IsAccessorAccessible (Type invocation_type, MethodInfo mi, out bool must_do_cs1540_check)
{
MethodAttributes ma = mi.Attributes & MethodAttributes.MemberAccessMask;
must_do_cs1540_check = false; // by default we do not check for this
if (ma == MethodAttributes.Public)
return true;
//
// If only accessible to the current class or children
//
if (ma == MethodAttributes.Private)
return TypeManager.IsPrivateAccessible (invocation_type, mi.DeclaringType) ||
TypeManager.IsNestedChildOf (invocation_type, mi.DeclaringType);
if (TypeManager.IsThisOrFriendAssembly (mi.DeclaringType.Assembly)) {
if (ma == MethodAttributes.Assembly || ma == MethodAttributes.FamORAssem)
return true;
} else {
if (ma == MethodAttributes.Assembly || ma == MethodAttributes.FamANDAssem)
return false;
}
// Family and FamANDAssem require that we derive.
// FamORAssem requires that we derive if in different assemblies.
if (!TypeManager.IsNestedFamilyAccessible (invocation_type, mi.DeclaringType))
return false;
if (!TypeManager.IsNestedChildOf (invocation_type, mi.DeclaringType))
must_do_cs1540_check = true;
return true;
}
public virtual bool IsNull {
get {
return false;
}
}
/// <summary>
/// Performs semantic analysis on the Expression
/// </summary>
///
/// <remarks>
/// The Resolve method is invoked to perform the semantic analysis
/// on the node.
///
/// The return value is an expression (it can be the
/// same expression in some cases) or a new
/// expression that better represents this node.
///
/// For example, optimizations of Unary (LiteralInt)
/// would return a new LiteralInt with a negated
/// value.
///
/// If there is an error during semantic analysis,
/// then an error should be reported (using Report)
/// and a null value should be returned.
///
/// There are two side effects expected from calling
/// Resolve(): the the field variable "eclass" should
/// be set to any value of the enumeration
/// `ExprClass' and the type variable should be set
/// to a valid type (this is the type of the
/// expression).
/// </remarks>
public abstract Expression DoResolve (ResolveContext ec);
public virtual Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
return null;
}
//
// This is used if the expression should be resolved as a type or namespace name.
// the default implementation fails.
//
public virtual FullNamedExpression ResolveAsTypeStep (IMemberContext rc, bool silent)
{
if (!silent) {
ResolveContext ec = new ResolveContext (rc);
Expression e = Resolve (ec);
if (e != null)
e.Error_UnexpectedKind (ec, ResolveFlags.Type, loc);
}
return null;
}
//
// C# 3.0 introduced contextual keywords (var) which behaves like a type if type with
// same name exists or as a keyword when no type was found
//
public virtual TypeExpr ResolveAsContextualType (IMemberContext rc, bool silent)
{
return ResolveAsTypeTerminal (rc, silent);
}
//
// This is used to resolve the expression as a type, a null
// value will be returned if the expression is not a type
// reference
//
public virtual TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
{
TypeExpr te = ResolveAsBaseTerminal (ec, silent);
if (te == null)
return null;
if (!silent) { // && !(te is TypeParameterExpr)) {
ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (te.Type);
if (obsolete_attr != null && !ec.IsObsolete) {
AttributeTester.Report_ObsoleteMessage (obsolete_attr, te.GetSignatureForError (), Location, ec.Compiler.Report);
}
}
GenericTypeExpr ct = te as GenericTypeExpr;
if (ct != null) {
//
// TODO: Constrained type parameters check for parameters of generic method overrides is broken
// There are 2 solutions.
// 1, Skip this check completely when we are in override/explicit impl scope
// 2, Copy type parameters constraints from base implementation and pass (they have to be emitted anyway)
//
MemberCore gm = ec as GenericMethod;
if (gm == null)
gm = ec as Method;
if (gm != null && ((gm.ModFlags & Modifiers.OVERRIDE) != 0 || gm.MemberName.Left != null)) {
te.loc = loc;
return te;
}
// TODO: silent flag is ignored
ct.CheckConstraints (ec);
}
return te;
}
public TypeExpr ResolveAsBaseTerminal (IMemberContext ec, bool silent)
{
int errors = ec.Compiler.Report.Errors;
FullNamedExpression fne = ResolveAsTypeStep (ec, silent);
if (fne == null)
return null;
TypeExpr te = fne as TypeExpr;
if (te == null) {
if (!silent && errors == ec.Compiler.Report.Errors)
fne.Error_UnexpectedKind (ec.Compiler.Report, null, "type", loc);
return null;
}
if (!te.CheckAccessLevel (ec)) {
ec.Compiler.Report.SymbolRelatedToPreviousError (te.Type);
ErrorIsInaccesible (loc, TypeManager.CSharpName (te.Type), ec.Compiler.Report);
return null;
}
te.loc = loc;
return te;
}
public static void ErrorIsInaccesible (Location loc, string name, Report Report)
{
Report.Error (122, loc, "`{0}' is inaccessible due to its protection level", name);
}
protected static void Error_CannotAccessProtected (ResolveContext ec, Location loc, MemberInfo m, Type qualifier, Type container)
{
ec.Report.Error (1540, loc, "Cannot access protected member `{0}' via a qualifier of type `{1}'."
+ " The qualifier must be of type `{2}' or derived from it",
TypeManager.GetFullNameSignature (m),
TypeManager.CSharpName (qualifier),
TypeManager.CSharpName (container));
}
public static void Error_InvalidExpressionStatement (Report Report, Location loc)
{
Report.Error (201, loc, "Only assignment, call, increment, decrement, and new object " +
"expressions can be used as a statement");
}
public void Error_InvalidExpressionStatement (BlockContext ec)
{
Error_InvalidExpressionStatement (ec.Report, loc);
}
public static void Error_VoidInvalidInTheContext (Location loc, Report Report)
{
Report.Error (1547, loc, "Keyword `void' cannot be used in this context");
}
public virtual void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, Type target, bool expl)
{
Error_ValueCannotBeConvertedCore (ec, loc, target, expl);
}
protected void Error_ValueCannotBeConvertedCore (ResolveContext ec, Location loc, Type target, bool expl)
{
// The error was already reported as CS1660
if (type == InternalType.AnonymousMethod)
return;
if (TypeManager.IsGenericParameter (Type) && TypeManager.IsGenericParameter (target) && type.Name == target.Name) {
#if GMCS_SOURCE
string sig1 = type.DeclaringMethod == null ?
TypeManager.CSharpName (type.DeclaringType) :
TypeManager.CSharpSignature (type.DeclaringMethod);
string sig2 = target.DeclaringMethod == null ?
TypeManager.CSharpName (target.DeclaringType) :
TypeManager.CSharpSignature (target.DeclaringMethod);
ec.Report.ExtraInformation (loc,
String.Format (
"The generic parameter `{0}' of `{1}' cannot be converted to the generic parameter `{0}' of `{2}' (in the previous ",
Type.Name, sig1, sig2));
#endif
} else if (Type.FullName == target.FullName){
ec.Report.ExtraInformation (loc,
String.Format (
"The type `{0}' has two conflicting definitions, one comes from `{1}' and the other from `{2}' (in the previous ",
Type.FullName, Type.Assembly.FullName, target.Assembly.FullName));
}
if (expl) {
ec.Report.Error (30, loc, "Cannot convert type `{0}' to `{1}'",
TypeManager.CSharpName (type), TypeManager.CSharpName (target));
return;
}
ec.Report.DisableReporting ();
bool expl_exists = Convert.ExplicitConversion (ec, this, target, Location.Null) != null;
ec.Report.EnableReporting ();
if (expl_exists) {
ec.Report.Error (266, loc, "Cannot implicitly convert type `{0}' to `{1}'. " +
"An explicit conversion exists (are you missing a cast?)",
TypeManager.CSharpName (Type), TypeManager.CSharpName (target));
return;
}
ec.Report.Error (29, loc, "Cannot implicitly convert type `{0}' to `{1}'",
TypeManager.CSharpName (type),
TypeManager.CSharpName (target));
}
public virtual void Error_VariableIsUsedBeforeItIsDeclared (Report Report, string name)
{
Report.Error (841, loc, "A local variable `{0}' cannot be used before it is declared", name);
}
protected virtual void Error_TypeDoesNotContainDefinition (ResolveContext ec, Type type, string name)
{
Error_TypeDoesNotContainDefinition (ec, loc, type, name);
}
public static void Error_TypeDoesNotContainDefinition (ResolveContext ec, Location loc, Type type, string name)
{
ec.Report.SymbolRelatedToPreviousError (type);
ec.Report.Error (117, loc, "`{0}' does not contain a definition for `{1}'",
TypeManager.CSharpName (type), name);
}
protected static void Error_ValueAssignment (ResolveContext ec, Location loc)
{
ec.Report.Error (131, loc, "The left-hand side of an assignment must be a variable, a property or an indexer");
}
ResolveFlags ExprClassToResolveFlags
{
get {
switch (eclass) {
case ExprClass.Type:
case ExprClass.Namespace:
return ResolveFlags.Type;
case ExprClass.MethodGroup:
return ResolveFlags.MethodGroup;
case ExprClass.TypeParameter:
return ResolveFlags.TypeParameter;
case ExprClass.Value:
case ExprClass.Variable:
case ExprClass.PropertyAccess:
case ExprClass.EventAccess:
case ExprClass.IndexerAccess:
return ResolveFlags.VariableOrValue;
default:
throw new InternalErrorException (loc.ToString () + " " + GetType () + " ExprClass is Invalid after resolve");
}
}
}
/// <summary>
/// Resolves an expression and performs semantic analysis on it.
/// </summary>
///
/// <remarks>
/// Currently Resolve wraps DoResolve to perform sanity
/// checking and assertion checking on what we expect from Resolve.
/// </remarks>
public Expression Resolve (ResolveContext ec, ResolveFlags flags)
{
if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type)
return ResolveAsTypeStep (ec, false);
bool do_flow_analysis = ec.DoFlowAnalysis;
bool omit_struct_analysis = ec.OmitStructFlowAnalysis;
if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
do_flow_analysis = false;
if ((flags & ResolveFlags.DisableStructFlowAnalysis) != 0)
omit_struct_analysis = true;
Expression e;
using (ec.WithFlowAnalysis (do_flow_analysis, omit_struct_analysis)) {
if (this is SimpleName) {
bool intermediate = (flags & ResolveFlags.Intermediate) == ResolveFlags.Intermediate;
e = ((SimpleName) this).DoResolve (ec, intermediate);
} else {
e = DoResolve (ec);
}
}
if (e == null)
return null;
if ((flags & e.ExprClassToResolveFlags) == 0) {
e.Error_UnexpectedKind (ec, flags, loc);
return null;
}
if (e.type == null && !(e is Namespace)) {
throw new Exception (
"Expression " + e.GetType () +
" did not set its type after Resolve\n" +
"called from: " + this.GetType ());
}
return e;
}
/// <summary>
/// Resolves an expression and performs semantic analysis on it.
/// </summary>
public Expression Resolve (ResolveContext ec)
{
Expression e = Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
if (e != null && e.eclass == ExprClass.MethodGroup && RootContext.Version == LanguageVersion.ISO_1) {
((MethodGroupExpr) e).ReportUsageError (ec);
return null;
}
return e;
}
public Constant ResolveAsConstant (ResolveContext ec, MemberCore mc)
{
Expression e = Resolve (ec);
if (e == null)
return null;
Constant c = e as Constant;
if (c != null)
return c;
if (type != null && TypeManager.IsReferenceType (type))
Const.Error_ConstantCanBeInitializedWithNullOnly (type, loc, mc.GetSignatureForError (), ec.Report);
else
Const.Error_ExpressionMustBeConstant (loc, mc.GetSignatureForError (), ec.Report);
return null;
}
/// <summary>
/// Resolves an expression for LValue assignment
/// </summary>
///
/// <remarks>
/// Currently ResolveLValue wraps DoResolveLValue to perform sanity
/// checking and assertion checking on what we expect from Resolve
/// </remarks>
public Expression ResolveLValue (ResolveContext ec, Expression right_side)
{
int errors = ec.Report.Errors;
bool out_access = right_side == EmptyExpression.OutAccess;
Expression e = DoResolveLValue (ec, right_side);
if (e != null && out_access && !(e is IMemoryLocation)) {
// FIXME: There's no problem with correctness, the 'Expr = null' handles that.
// Enabling this 'throw' will "only" result in deleting useless code elsewhere,
//throw new InternalErrorException ("ResolveLValue didn't return an IMemoryLocation: " +
// e.GetType () + " " + e.GetSignatureForError ());
e = null;
}
if (e == null) {
if (errors == ec.Report.Errors) {
if (out_access)
ec.Report.Error (1510, loc, "A ref or out argument must be an assignable variable");
else
Error_ValueAssignment (ec, loc);
}
return null;
}
if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e + " ExprClass is Invalid after resolve");
if ((e.type == null) && !(e is GenericTypeExpr))
throw new Exception ("Expression " + e + " did not set its type after Resolve");
return e;
}
/// <summary>
/// Emits the code for the expression
/// </summary>
///
/// <remarks>
/// The Emit method is invoked to generate the code
/// for the expression.
/// </remarks>
public abstract void Emit (EmitContext ec);
// Emit code to branch to @target if this expression is equivalent to @on_true.
// The default implementation is to emit the value, and then emit a brtrue or brfalse.
// Subclasses can provide more efficient implementations, but those MUST be equivalent,
// including the use of conditional branches. Note also that a branch MUST be emitted
public virtual void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
Emit (ec);
ec.ig.Emit (on_true ? OpCodes.Brtrue : OpCodes.Brfalse, target);
}
// Emit this expression for its side effects, not for its value.
// The default implementation is to emit the value, and then throw it away.
// Subclasses can provide more efficient implementations, but those MUST be equivalent
public virtual void EmitSideEffect (EmitContext ec)
{
Emit (ec);
ec.ig.Emit (OpCodes.Pop);
}
/// <summary>
/// Protected constructor. Only derivate types should
/// be able to be created
/// </summary>
protected Expression ()
{
eclass = ExprClass.Invalid;
type = null;
}
/// <summary>
/// Returns a fully formed expression after a MemberLookup
/// </summary>
///
public static Expression ExprClassFromMemberInfo (Type container_type, MemberInfo mi, Location loc)
{
if (mi is EventInfo)
return new EventExpr ((EventInfo) mi, loc);
else if (mi is FieldInfo) {
FieldInfo fi = (FieldInfo) mi;
if (fi.IsLiteral || (fi.IsInitOnly && fi.FieldType == TypeManager.decimal_type))
return new ConstantExpr (fi, loc);
return new FieldExpr (fi, loc);
} else if (mi is PropertyInfo)
return new PropertyExpr (container_type, (PropertyInfo) mi, loc);
else if (mi is Type) {
return new TypeExpression ((System.Type) mi, loc);
}
return null;
}
// TODO: [Obsolete ("Can be removed")]
protected static ArrayList almost_matched_members = new ArrayList (4);
//
// FIXME: Probably implement a cache for (t,name,current_access_set)?
//
// This code could use some optimizations, but we need to do some
// measurements. For example, we could use a delegate to `flag' when
// something can not any longer be a method-group (because it is something
// else).
//
// Return values:
// If the return value is an Array, then it is an array of
// MethodBases
//
// If the return value is an MemberInfo, it is anything, but a Method
//
// null on error.
//
// FIXME: When calling MemberLookup inside an `Invocation', we should pass
// the arguments here and have MemberLookup return only the methods that
// match the argument count/type, unlike we are doing now (we delay this
// decision).
//
// This is so we can catch correctly attempts to invoke instance methods
// from a static body (scan for error 120 in ResolveSimpleName).
//
//
// FIXME: Potential optimization, have a static ArrayList
//
public static Expression MemberLookup (CompilerContext ctx, Type container_type, Type queried_type, string name,
MemberTypes mt, BindingFlags bf, Location loc)
{
return MemberLookup (ctx, container_type, null, queried_type, name, mt, bf, loc);
}
//
// Lookup type `queried_type' for code in class `container_type' with a qualifier of
// `qualifier_type' or null to lookup members in the current class.
//
public static Expression MemberLookup (CompilerContext ctx, Type container_type,
Type qualifier_type, Type queried_type,
string name, MemberTypes mt,
BindingFlags bf, Location loc)
{
almost_matched_members.Clear ();
MemberInfo [] mi = TypeManager.MemberLookup (container_type, qualifier_type,
queried_type, mt, bf, name, almost_matched_members);
if (mi == null)
return null;
if (mi.Length > 1) {
bool is_interface = qualifier_type != null && qualifier_type.IsInterface;
ArrayList methods = new ArrayList (2);
ArrayList non_methods = null;
foreach (MemberInfo m in mi) {
if (m is MethodBase) {
methods.Add (m);
continue;
}
if (non_methods == null)
non_methods = new ArrayList (2);
bool is_candidate = true;
for (int i = 0; i < non_methods.Count; ++i) {
MemberInfo n_m = (MemberInfo) non_methods [i];
if (n_m.DeclaringType.IsInterface && TypeManager.ImplementsInterface (m.DeclaringType, n_m.DeclaringType)) {
non_methods.Remove (n_m);
--i;
} else if (m.DeclaringType.IsInterface && TypeManager.ImplementsInterface (n_m.DeclaringType, m.DeclaringType)) {
is_candidate = false;
break;
}
}
if (is_candidate) {
non_methods.Add (m);
}
}
if (methods.Count == 0 && non_methods != null && non_methods.Count > 1) {
ctx.Report.SymbolRelatedToPreviousError ((MemberInfo)non_methods [1]);
ctx.Report.SymbolRelatedToPreviousError ((MemberInfo)non_methods [0]);
ctx.Report.Error (229, loc, "Ambiguity between `{0}' and `{1}'",
TypeManager.GetFullNameSignature ((MemberInfo)non_methods [1]),
TypeManager.GetFullNameSignature ((MemberInfo)non_methods [0]));
return null;
}
if (methods.Count == 0)
return ExprClassFromMemberInfo (container_type, (MemberInfo)non_methods [0], loc);
if (non_methods != null && non_methods.Count > 0) {
MethodBase method = (MethodBase) methods [0];
MemberInfo non_method = (MemberInfo) non_methods [0];
if (method.DeclaringType == non_method.DeclaringType) {
// Cannot happen with C# code, but is valid in IL
ctx.Report.SymbolRelatedToPreviousError (method);
ctx.Report.SymbolRelatedToPreviousError (non_method);
ctx.Report.Error (229, loc, "Ambiguity between `{0}' and `{1}'",
TypeManager.GetFullNameSignature (non_method),
TypeManager.CSharpSignature (method));
return null;
}
if (is_interface) {
ctx.Report.SymbolRelatedToPreviousError (method);
ctx.Report.SymbolRelatedToPreviousError (non_method);
ctx.Report.Warning (467, 2, loc, "Ambiguity between method `{0}' and non-method `{1}'. Using method `{0}'",
TypeManager.CSharpSignature (method), TypeManager.GetFullNameSignature (non_method));
}
}
return new MethodGroupExpr (methods, queried_type, loc);
}
if (mi [0] is MethodBase)
return new MethodGroupExpr (mi, queried_type, loc);
return ExprClassFromMemberInfo (container_type, mi [0], loc);
}
public const MemberTypes AllMemberTypes =
MemberTypes.Constructor |
MemberTypes.Event |
MemberTypes.Field |
MemberTypes.Method |
MemberTypes.NestedType |
MemberTypes.Property;
public const BindingFlags AllBindingFlags =
BindingFlags.Public |
BindingFlags.Static |
BindingFlags.Instance;
public static Expression MemberLookup (CompilerContext ctx, Type container_type, Type queried_type,
string name, Location loc)
{
return MemberLookup (ctx, container_type, null, queried_type, name,
AllMemberTypes, AllBindingFlags, loc);
}
public static Expression MemberLookup (CompilerContext ctx, Type container_type, Type qualifier_type,
Type queried_type, string name, Location loc)
{
return MemberLookup (ctx, container_type, qualifier_type, queried_type,
name, AllMemberTypes, AllBindingFlags, loc);
}
public static MethodGroupExpr MethodLookup (CompilerContext ctx, Type container_type, Type queried_type,
string name, Location loc)
{
return (MethodGroupExpr)MemberLookup (ctx, container_type, null, queried_type, name,
MemberTypes.Method, AllBindingFlags, loc);
}
/// <summary>
/// This is a wrapper for MemberLookup that is not used to "probe", but
/// to find a final definition. If the final definition is not found, we
/// look for private members and display a useful debugging message if we
/// find it.
/// </summary>
protected Expression MemberLookupFinal (ResolveContext ec, Type qualifier_type,
Type queried_type, string name,
MemberTypes mt, BindingFlags bf,
Location loc)
{
Expression e;
int errors = ec.Report.Errors;
e = MemberLookup (ec.Compiler, ec.CurrentType, qualifier_type, queried_type, name, mt, bf, loc);
if (e != null || errors != ec.Report.Errors)
return e;
// No errors were reported by MemberLookup, but there was an error.
return Error_MemberLookupFailed (ec, ec.CurrentType, qualifier_type, queried_type,
name, null, mt, bf);
}
protected virtual Expression Error_MemberLookupFailed (ResolveContext ec, Type container_type, Type qualifier_type,
Type queried_type, string name, string class_name,
MemberTypes mt, BindingFlags bf)
{
MemberInfo[] lookup = null;
if (queried_type == null) {
class_name = "global::";
} else {
lookup = TypeManager.MemberLookup (queried_type, null, queried_type,
mt, (bf & ~BindingFlags.Public) | BindingFlags.NonPublic,
name, null);
if (lookup != null) {
Expression e = Error_MemberLookupFailed (ec, queried_type, lookup);
//
// FIXME: This is still very wrong, it should be done inside
// OverloadResolve to do correct arguments matching.
// Requires MemberLookup accessiblity check removal
//
if (e == null || (mt & (MemberTypes.Method | MemberTypes.Constructor)) == 0) {
MemberInfo mi = lookup[0];
ec.Report.SymbolRelatedToPreviousError (mi);
if (qualifier_type != null && container_type != null && qualifier_type != container_type &&
TypeManager.IsNestedFamilyAccessible (container_type, mi.DeclaringType)) {
// Although a derived class can access protected members of
// its base class it cannot do so through an instance of the
// base class (CS1540). If the qualifier_type is a base of the
// ec.CurrentType and the lookup succeeds with the latter one,
// then we are in this situation.
Error_CannotAccessProtected (ec, loc, mi, qualifier_type, container_type);
} else {
ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (mi), ec.Report);
}
}
return e;
}
lookup = TypeManager.MemberLookup (queried_type, null, queried_type,
AllMemberTypes, AllBindingFlags | BindingFlags.NonPublic,
name, null);
}
if (lookup == null) {
if (class_name != null) {
ec.Report.Error (103, loc, "The name `{0}' does not exist in the current context",
name);
} else {
Error_TypeDoesNotContainDefinition (ec, queried_type, name);
}
return null;
}
if (TypeManager.MemberLookup (queried_type, null, queried_type,
AllMemberTypes, AllBindingFlags |
BindingFlags.NonPublic, name, null) == null) {
if ((lookup.Length == 1) && (lookup [0] is Type)) {
Type t = (Type) lookup [0];
ec.Report.Error (305, loc,
"Using the generic type `{0}' " +
"requires {1} type arguments",
TypeManager.CSharpName (t),
TypeManager.GetNumberOfTypeArguments (t).ToString ());
return null;
}
}
return Error_MemberLookupFailed (ec, queried_type, lookup);
}
protected virtual Expression Error_MemberLookupFailed (ResolveContext ec, Type type, MemberInfo[] members)
{
for (int i = 0; i < members.Length; ++i) {
if (!(members [i] is MethodBase))
return null;
}
// By default propagate the closest candidates upwards
return new MethodGroupExpr (members, type, loc, true);
}
protected virtual void Error_NegativeArrayIndex (ResolveContext ec, Location loc)
{
throw new NotImplementedException ();
}
protected void Error_PointerInsideExpressionTree (ResolveContext ec)
{
ec.Report.Error (1944, loc, "An expression tree cannot contain an unsafe pointer operation");
}
/// <summary>
/// Returns an expression that can be used to invoke operator true
/// on the expression if it exists.
/// </summary>
static public Expression GetOperatorTrue (ResolveContext ec, Expression e, Location loc)
{
return GetOperatorTrueOrFalse (ec, e, true, loc);
}
/// <summary>
/// Returns an expression that can be used to invoke operator false
/// on the expression if it exists.
/// </summary>
static public Expression GetOperatorFalse (ResolveContext ec, Expression e, Location loc)
{
return GetOperatorTrueOrFalse (ec, e, false, loc);
}
static Expression GetOperatorTrueOrFalse (ResolveContext ec, Expression e, bool is_true, Location loc)
{
MethodGroupExpr operator_group;
string mname = Operator.GetMetadataName (is_true ? Operator.OpType.True : Operator.OpType.False);
operator_group = MethodLookup (ec.Compiler, ec.CurrentType, e.Type, mname, loc) as MethodGroupExpr;
if (operator_group == null)
return null;
Arguments arguments = new Arguments (1);
arguments.Add (new Argument (e));
operator_group = operator_group.OverloadResolve (
ec, ref arguments, false, loc);
if (operator_group == null)
return null;
return new UserOperatorCall (operator_group, arguments, null, loc);
}
/// <summary>
/// Resolves the expression `e' into a boolean expression: either through
/// an implicit conversion, or through an `operator true' invocation
/// </summary>
public static Expression ResolveBoolean (ResolveContext ec, Expression e, Location loc)
{
e = e.Resolve (ec);
if (e == null)
return null;
if (e.Type == TypeManager.bool_type)
return e;
if (TypeManager.IsDynamicType (e.Type)) {
Arguments args = new Arguments (1);
args.Add (new Argument (e));
return new DynamicUnaryConversion ("IsTrue", args, loc).Resolve (ec);
}
Expression converted = Convert.ImplicitConversion (ec, e, TypeManager.bool_type, Location.Null);
if (converted != null)
return converted;
//
// If no implicit conversion to bool exists, try using `operator true'
//
converted = Expression.GetOperatorTrue (ec, e, loc);
if (converted == null){
e.Error_ValueCannotBeConverted (ec, loc, TypeManager.bool_type, false);
return null;
}
return converted;
}
public virtual string ExprClassName
{
get {
switch (eclass){
case ExprClass.Invalid:
return "Invalid";
case ExprClass.Value:
return "value";
case ExprClass.Variable:
return "variable";
case ExprClass.Namespace:
return "namespace";
case ExprClass.Type:
return "type";
case ExprClass.MethodGroup:
return "method group";
case ExprClass.PropertyAccess:
return "property access";
case ExprClass.EventAccess:
return "event access";
case ExprClass.IndexerAccess:
return "indexer access";
case ExprClass.Nothing:
return "null";
case ExprClass.TypeParameter:
return "type parameter";
}
throw new Exception ("Should not happen");
}
}
/// <summary>
/// Reports that we were expecting `expr' to be of class `expected'
/// </summary>
public void Error_UnexpectedKind (Report r, MemberCore mc, string expected, Location loc)
{
Error_UnexpectedKind (r, mc, expected, ExprClassName, loc);
}
public void Error_UnexpectedKind (Report r, MemberCore mc, string expected, string was, Location loc)
{
string name;
if (mc != null)
name = mc.GetSignatureForError ();
else
name = GetSignatureForError ();
r.Error (118, loc, "`{0}' is a `{1}' but a `{2}' was expected",
name, was, expected);
}
public void Error_UnexpectedKind (ResolveContext ec, ResolveFlags flags, Location loc)
{
string [] valid = new string [4];
int count = 0;
if ((flags & ResolveFlags.VariableOrValue) != 0) {
valid [count++] = "variable";
valid [count++] = "value";
}
if ((flags & ResolveFlags.Type) != 0)
valid [count++] = "type";
if ((flags & ResolveFlags.MethodGroup) != 0)
valid [count++] = "method group";
if (count == 0)
valid [count++] = "unknown";
StringBuilder sb = new StringBuilder (valid [0]);
for (int i = 1; i < count - 1; i++) {
sb.Append ("', `");
sb.Append (valid [i]);
}
if (count > 1) {
sb.Append ("' or `");
sb.Append (valid [count - 1]);
}
ec.Report.Error (119, loc,
"Expression denotes a `{0}', where a `{1}' was expected", ExprClassName, sb.ToString ());
}
public static void UnsafeError (ResolveContext ec, Location loc)
{
UnsafeError (ec.Report, loc);
}
public static void UnsafeError (Report Report, Location loc)
{
Report.Error (214, loc, "Pointers and fixed size buffers may only be used in an unsafe context");
}
//
// Load the object from the pointer.
//
public static void LoadFromPtr (ILGenerator ig, Type t)
{
if (t == TypeManager.int32_type)
ig.Emit (OpCodes.Ldind_I4);
else if (t == TypeManager.uint32_type)
ig.Emit (OpCodes.Ldind_U4);
else if (t == TypeManager.short_type)
ig.Emit (OpCodes.Ldind_I2);
else if (t == TypeManager.ushort_type)
ig.Emit (OpCodes.Ldind_U2);
else if (t == TypeManager.char_type)
ig.Emit (OpCodes.Ldind_U2);
else if (t == TypeManager.byte_type)
ig.Emit (OpCodes.Ldind_U1);
else if (t == TypeManager.sbyte_type)
ig.Emit (OpCodes.Ldind_I1);
else if (t == TypeManager.uint64_type)
ig.Emit (OpCodes.Ldind_I8);
else if (t == TypeManager.int64_type)
ig.Emit (OpCodes.Ldind_I8);
else if (t == TypeManager.float_type)
ig.Emit (OpCodes.Ldind_R4);
else if (t == TypeManager.double_type)
ig.Emit (OpCodes.Ldind_R8);
else if (t == TypeManager.bool_type)
ig.Emit (OpCodes.Ldind_I1);
else if (t == TypeManager.intptr_type)
ig.Emit (OpCodes.Ldind_I);
else if (TypeManager.IsEnumType (t)) {
if (t == TypeManager.enum_type)
ig.Emit (OpCodes.Ldind_Ref);
else
LoadFromPtr (ig, TypeManager.GetEnumUnderlyingType (t));
} else if (TypeManager.IsStruct (t) || TypeManager.IsGenericParameter (t))
ig.Emit (OpCodes.Ldobj, t);
else if (t.IsPointer)
ig.Emit (OpCodes.Ldind_I);
else
ig.Emit (OpCodes.Ldind_Ref);
}
//
// The stack contains the pointer and the value of type `type'
//
public static void StoreFromPtr (ILGenerator ig, Type type)
{
if (TypeManager.IsEnumType (type))
type = TypeManager.GetEnumUnderlyingType (type);
if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
ig.Emit (OpCodes.Stind_I4);
else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
ig.Emit (OpCodes.Stind_I8);
else if (type == TypeManager.char_type || type == TypeManager.short_type ||
type == TypeManager.ushort_type)
ig.Emit (OpCodes.Stind_I2);
else if (type == TypeManager.float_type)
ig.Emit (OpCodes.Stind_R4);
else if (type == TypeManager.double_type)
ig.Emit (OpCodes.Stind_R8);
else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
type == TypeManager.bool_type)
ig.Emit (OpCodes.Stind_I1);
else if (type == TypeManager.intptr_type)
ig.Emit (OpCodes.Stind_I);
else if (TypeManager.IsStruct (type) || TypeManager.IsGenericParameter (type))
ig.Emit (OpCodes.Stobj, type);
else
ig.Emit (OpCodes.Stind_Ref);
}
//
// Returns the size of type `t' if known, otherwise, 0
//
public static int GetTypeSize (Type t)
{
t = TypeManager.TypeToCoreType (t);
if (t == TypeManager.int32_type ||
t == TypeManager.uint32_type ||
t == TypeManager.float_type)
return 4;
else if (t == TypeManager.int64_type ||
t == TypeManager.uint64_type ||
t == TypeManager.double_type)
return 8;
else if (t == TypeManager.byte_type ||
t == TypeManager.sbyte_type ||
t == TypeManager.bool_type)
return 1;
else if (t == TypeManager.short_type ||
t == TypeManager.char_type ||
t == TypeManager.ushort_type)
return 2;
else if (t == TypeManager.decimal_type)
return 16;
else
return 0;
}
protected void Error_CannotCallAbstractBase (ResolveContext ec, string name)
{
ec.Report.Error (205, loc, "Cannot call an abstract base member `{0}'", name);
}
protected void Error_CannotModifyIntermediateExpressionValue (ResolveContext ec)
{
ec.Report.SymbolRelatedToPreviousError (type);
if (ec.CurrentInitializerVariable != null) {
ec.Report.Error (1918, loc, "Members of value type `{0}' cannot be assigned using a property `{1}' object initializer",
TypeManager.CSharpName (type), GetSignatureForError ());
} else {
ec.Report.Error (1612, loc, "Cannot modify a value type return value of `{0}'. Consider storing the value in a temporary variable",
GetSignatureForError ());
}
}
//
// Converts `source' to an int, uint, long or ulong.
//
protected Expression ConvertExpressionToArrayIndex (ResolveContext ec, Expression source)
{
if (TypeManager.IsDynamicType (source.type)) {
Arguments args = new Arguments (1);
args.Add (new Argument (source));
return new DynamicConversion (TypeManager.int32_type, false, args, loc).Resolve (ec);
}
Expression converted;
using (ec.Set (ResolveContext.Options.CheckedScope)) {
converted = Convert.ImplicitConversion (ec, source, TypeManager.int32_type, source.loc);
if (converted == null)
converted = Convert.ImplicitConversion (ec, source, TypeManager.uint32_type, source.loc);
if (converted == null)
converted = Convert.ImplicitConversion (ec, source, TypeManager.int64_type, source.loc);
if (converted == null)
converted = Convert.ImplicitConversion (ec, source, TypeManager.uint64_type, source.loc);
if (converted == null) {
source.Error_ValueCannotBeConverted (ec, source.loc, TypeManager.int32_type, false);
return null;
}
}
//
// Only positive constants are allowed at compile time
//
Constant c = converted as Constant;
if (c != null && c.IsNegative)
Error_NegativeArrayIndex (ec, source.loc);
// No conversion needed to array index
if (converted.Type == TypeManager.int32_type)
return converted;
return new ArrayIndexCast (converted).Resolve (ec);
}
//
// Derived classes implement this method by cloning the fields that
// could become altered during the Resolve stage
//
// Only expressions that are created for the parser need to implement
// this.
//
protected virtual void CloneTo (CloneContext clonectx, Expression target)
{
throw new NotImplementedException (
String.Format (
"CloneTo not implemented for expression {0}", this.GetType ()));
}
//
// Clones an expression created by the parser.
//
// We only support expressions created by the parser so far, not
// expressions that have been resolved (many more classes would need
// to implement CloneTo).
//
// This infrastructure is here merely for Lambda expressions which
// compile the same code using different type values for the same
// arguments to find the correct overload
//
public Expression Clone (CloneContext clonectx)
{
Expression cloned = (Expression) MemberwiseClone ();
CloneTo (clonectx, cloned);
return cloned;
}
//
// Implementation of expression to expression tree conversion
//
public abstract Expression CreateExpressionTree (ResolveContext ec);
protected Expression CreateExpressionFactoryCall (ResolveContext ec, string name, Arguments args)
{
return CreateExpressionFactoryCall (ec, name, null, args, loc);
}
protected Expression CreateExpressionFactoryCall (ResolveContext ec, string name, TypeArguments typeArguments, Arguments args)
{
return CreateExpressionFactoryCall (ec, name, typeArguments, args, loc);
}
public static Expression CreateExpressionFactoryCall (ResolveContext ec, string name, TypeArguments typeArguments, Arguments args, Location loc)
{
return new Invocation (new MemberAccess (CreateExpressionTypeExpression (ec, loc), name, typeArguments, loc), args);
}
protected static TypeExpr CreateExpressionTypeExpression (ResolveContext ec, Location loc)
{
TypeExpr texpr = TypeManager.expression_type_expr;
if (texpr == null) {
Type t = TypeManager.CoreLookupType (ec.Compiler, "System.Linq.Expressions", "Expression", Kind.Class, true);
if (t == null)
return null;
TypeManager.expression_type_expr = texpr = new TypeExpression (t, Location.Null);
}
return texpr;
}
#if NET_4_0
//
// Implemented by all expressions which support conversion from
// compiler expression to invokable runtime expression. Used by
// dynamic C# binder.
//
public virtual SLE.Expression MakeExpression (BuilderContext ctx)
{
throw new NotImplementedException ("MakeExpression for " + GetType ());
}
#endif
public virtual void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
// TODO: It should probably be type = storey.MutateType (type);
}
}
/// <summary>
/// This is just a base class for expressions that can
/// appear on statements (invocations, object creation,
/// assignments, post/pre increment and decrement). The idea
/// being that they would support an extra Emition interface that
/// does not leave a result on the stack.
/// </summary>
public abstract class ExpressionStatement : Expression {
public virtual ExpressionStatement ResolveStatement (BlockContext ec)
{
Expression e = Resolve (ec);
if (e == null)
return null;
ExpressionStatement es = e as ExpressionStatement;
if (es == null)
Error_InvalidExpressionStatement (ec);
return es;
}
/// <summary>
/// Requests the expression to be emitted in a `statement'
/// context. This means that no new value is left on the
/// stack after invoking this method (constrasted with
/// Emit that will always leave a value on the stack).
/// </summary>
public abstract void EmitStatement (EmitContext ec);
public override void EmitSideEffect (EmitContext ec)
{
EmitStatement (ec);
}
}
/// <summary>
/// This kind of cast is used to encapsulate the child
/// whose type is child.Type into an expression that is
/// reported to return "return_type". This is used to encapsulate
/// expressions which have compatible types, but need to be dealt
/// at higher levels with.
///
/// For example, a "byte" expression could be encapsulated in one
/// of these as an "unsigned int". The type for the expression
/// would be "unsigned int".
///
/// </summary>
public abstract class TypeCast : Expression
{
protected readonly Expression child;
protected TypeCast (Expression child, Type return_type)
{
eclass = child.eclass;
loc = child.Location;
type = return_type;
this.child = child;
}
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("child", child);
}
public override string GetNameX()
{
return null;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (child.CreateExpressionTree (ec)));
args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
if (type.IsPointer || child.Type.IsPointer)
Error_PointerInsideExpressionTree (ec);
return CreateExpressionFactoryCall (ec, ec.HasSet (ResolveContext.Options.CheckedScope) ? "ConvertChecked" : "Convert", args);
}
public override Expression DoResolve (ResolveContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
child.Emit (ec);
}
public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
return child.GetAttributableValue (ec, value_type, out value);
}
#if NET_4_0
public override SLE.Expression MakeExpression (BuilderContext ctx)
{
return ctx.HasSet (BuilderContext.Options.CheckedScope) ?
SLE.Expression.ConvertChecked (child.MakeExpression (ctx), type) :
SLE.Expression.Convert (child.MakeExpression (ctx), type);
}
#endif
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
child.MutateHoistedGenericType (storey);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
// Nothing to clone
}
public override bool IsNull {
get { return child.IsNull; }
}
}
public class EmptyCast : TypeCast {
EmptyCast (Expression child, Type target_type)
: base (child, target_type)
{
}
public static Expression Create (Expression child, Type type)
{
Constant c = child as Constant;
if (c != null)
return new EmptyConstantCast (c, type);
EmptyCast e = child as EmptyCast;
if (e != null)
return new EmptyCast (e.child, type);
return new EmptyCast (child, type);
}
public override void EmitBranchable (EmitContext ec, Label label, bool on_true)
{
child.EmitBranchable (ec, label, on_true);
}
public override void EmitSideEffect (EmitContext ec)
{
child.EmitSideEffect (ec);
}
}
//
// Used for predefined class library user casts (no obsolete check, etc.)
//
public class OperatorCast : TypeCast {
MethodInfo conversion_operator;
public OperatorCast (Expression child, Type target_type)
: this (child, target_type, false)
{
}
public OperatorCast (Expression child, Type target_type, bool find_explicit)
: base (child, target_type)
{
conversion_operator = GetConversionOperator (find_explicit);
if (conversion_operator == null)
throw new InternalErrorException ("Outer conversion routine is out of sync");
}
// Returns the implicit operator that converts from
// 'child.Type' to our target type (type)
MethodInfo GetConversionOperator (bool find_explicit)
{
string operator_name = find_explicit ? "op_Explicit" : "op_Implicit";
MemberInfo [] mi;
mi = TypeManager.MemberLookup (child.Type, child.Type, child.Type, MemberTypes.Method,
BindingFlags.Static | BindingFlags.Public, operator_name, null);
if (mi == null){
mi = TypeManager.MemberLookup (type, type, type, MemberTypes.Method,
BindingFlags.Static | BindingFlags.Public, operator_name, null);
}
foreach (MethodInfo oper in mi) {
AParametersCollection pd = TypeManager.GetParameterData (oper);
if (pd.Types [0] == child.Type && TypeManager.TypeToCoreType (oper.ReturnType) == type)
return oper;
}
return null;
}
public override void Emit (EmitContext ec)
{
child.Emit (ec);
ec.ig.Emit (OpCodes.Call, conversion_operator);
}
}
/// <summary>
/// This is a numeric cast to a Decimal
/// </summary>
public class CastToDecimal : OperatorCast {
public CastToDecimal (Expression child)
: this (child, false)
{
}
public CastToDecimal (Expression child, bool find_explicit)
: base (child, TypeManager.decimal_type, find_explicit)
{
}
}
/// <summary>
/// This is an explicit numeric cast from a Decimal
/// </summary>
public class CastFromDecimal : TypeCast
{
static IDictionary operators;
public CastFromDecimal (Expression child, Type return_type)
: base (child, return_type)
{
if (child.Type != TypeManager.decimal_type)
throw new InternalErrorException (
"The expected type is Decimal, instead it is " + child.Type.FullName);
}
// Returns the explicit operator that converts from an
// express of type System.Decimal to 'type'.
public Expression Resolve ()
{
if (operators == null) {
MemberInfo[] all_oper = TypeManager.MemberLookup (TypeManager.decimal_type,
TypeManager.decimal_type, TypeManager.decimal_type, MemberTypes.Method,
BindingFlags.Static | BindingFlags.Public, "op_Explicit", null);
operators = new System.Collections.Specialized.HybridDictionary ();
foreach (MethodInfo oper in all_oper) {
AParametersCollection pd = TypeManager.GetParameterData (oper);
if (pd.Types [0] == TypeManager.decimal_type)
operators.Add (TypeManager.TypeToCoreType (oper.ReturnType), oper);
}
}
return operators.Contains (type) ? this : null;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
child.Emit (ec);
ig.Emit (OpCodes.Call, (MethodInfo)operators [type]);
}
}
//
// Constant specialization of EmptyCast.
// We need to special case this since an empty cast of
// a constant is still a constant.
//
public class EmptyConstantCast : Constant
{
public readonly Constant child;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("child", child);
}
public override string GetNameX()
{
return null;
}
public EmptyConstantCast(Constant child, Type type)
: base (child.Location)
{
eclass = child.eclass;
this.child = child;
this.type = type;
}
public override string AsString ()
{
return child.AsString ();
}
public override object GetValue ()
{
return child.GetValue ();
}
public override Constant ConvertExplicitly (bool in_checked_context, Type target_type)
{
// FIXME: check that 'type' can be converted to 'target_type' first
return child.ConvertExplicitly (in_checked_context, target_type);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = Arguments.CreateForExpressionTree (ec, null,
child.CreateExpressionTree (ec),
new TypeOf (new TypeExpression (type, loc), loc));
if (type.IsPointer)
Error_PointerInsideExpressionTree (ec);
return CreateExpressionFactoryCall (ec, "Convert", args);
}
public override Constant Increment ()
{
return child.Increment ();
}
public override bool IsDefaultValue {
get { return child.IsDefaultValue; }
}
public override bool IsNegative {
get { return child.IsNegative; }
}
public override bool IsNull {
get { return child.IsNull; }
}
public override bool IsZeroInteger {
get { return child.IsZeroInteger; }
}
public override void Emit (EmitContext ec)
{
child.Emit (ec);
}
public override void EmitBranchable (EmitContext ec, Label label, bool on_true)
{
child.EmitBranchable (ec, label, on_true);
#if GMCS_SOURCE
// Only to make verifier happy
if (TypeManager.IsGenericParameter (type) && child.IsNull)
ec.ig.Emit (OpCodes.Unbox_Any, type);
#endif
}
public override void EmitSideEffect (EmitContext ec)
{
child.EmitSideEffect (ec);
}
public override Constant ConvertImplicitly (Type target_type)
{
// FIXME: Do we need to check user conversions?
if (!Convert.ImplicitStandardConversionExists (this, target_type))
return null;
return child.ConvertImplicitly (target_type);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
child.MutateHoistedGenericType (storey);
}
}
/// <summary>
/// This class is used to wrap literals which belong inside Enums
/// </summary>
public class EnumConstant : Constant {
public Constant Child;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("Child", Child);
}
public override string GetNameX()
{
return null;
}
public EnumConstant (Constant child, Type enum_type):
base (child.Location)
{
eclass = child.eclass;
this.Child = child;
type = enum_type;
}
public override Expression DoResolve (ResolveContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
Child.Emit (ec);
}
public override void EmitBranchable (EmitContext ec, Label label, bool on_true)
{
Child.EmitBranchable (ec, label, on_true);
}
public override void EmitSideEffect (EmitContext ec)
{
Child.EmitSideEffect (ec);
}
public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
value = GetTypedValue ();
return true;
}
public override string GetSignatureForError()
{
return TypeManager.CSharpName (Type);
}
public override object GetValue ()
{
return Child.GetValue ();
}
public override object GetTypedValue ()
{
// FIXME: runtime is not ready to work with just emited enums
if (!RootContext.StdLib) {
return Child.GetValue ();
}
#if MS_COMPATIBLE
// Small workaround for big problem
// System.Enum.ToObject cannot be called on dynamic types
// EnumBuilder has to be used, but we cannot use EnumBuilder
// because it does not properly support generics
//
// This works only sometimes
//
if (type.Module == RootContext.ToplevelTypes.Builder)
return Child.GetValue ();
#endif
return System.Enum.ToObject (type, Child.GetValue ());
}
public override string AsString ()
{
return Child.AsString ();
}
public override Constant Increment()
{
return new EnumConstant (Child.Increment (), type);
}
public override bool IsDefaultValue {
get {
return Child.IsDefaultValue;
}
}
public override bool IsZeroInteger {
get { return Child.IsZeroInteger; }
}
public override bool IsNegative {
get {
return Child.IsNegative;
}
}
public override Constant ConvertExplicitly(bool in_checked_context, Type target_type)
{
if (Child.Type == target_type)
return Child;
return Child.ConvertExplicitly (in_checked_context, target_type);
}
public override Constant ConvertImplicitly (Type type)
{
Type this_type = TypeManager.DropGenericTypeArguments (Type);
type = TypeManager.DropGenericTypeArguments (type);
if (this_type == type) {
// This is workaround of mono bug. It can be removed when the latest corlib spreads enough
if (TypeManager.IsEnumType (type.UnderlyingSystemType))
return this;
Type child_type = TypeManager.DropGenericTypeArguments (Child.Type);
if (type.UnderlyingSystemType != child_type)
Child = Child.ConvertImplicitly (type.UnderlyingSystemType);
return this;
}
if (!Convert.ImplicitStandardConversionExists (this, type)){
return null;
}
return Child.ConvertImplicitly(type);
}
}
/// <summary>
/// This kind of cast is used to encapsulate Value Types in objects.
///
/// The effect of it is to box the value type emitted by the previous
/// operation.
/// </summary>
public class BoxedCast : TypeCast {
public BoxedCast (Expression expr, Type target_type)
: base (expr, target_type)
{
eclass = ExprClass.Value;
}
public override Expression DoResolve (ResolveContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
ec.ig.Emit (OpCodes.Box, child.Type);
}
public override void EmitSideEffect (EmitContext ec)
{
// boxing is side-effectful, since it involves runtime checks, except when boxing to Object or ValueType
// so, we need to emit the box+pop instructions in most cases
if (TypeManager.IsStruct (child.Type) &&
(type == TypeManager.object_type || type == TypeManager.value_type))
child.EmitSideEffect (ec);
else
base.EmitSideEffect (ec);
}
}
public class UnboxCast : TypeCast {
public UnboxCast (Expression expr, Type return_type)
: base (expr, return_type)
{
}
public override Expression DoResolve (ResolveContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess)
ec.Report.Error (445, loc, "Cannot modify the result of an unboxing conversion");
return base.DoResolveLValue (ec, right_side);
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
ILGenerator ig = ec.ig;
#if GMCS_SOURCE
ig.Emit (OpCodes.Unbox_Any, type);
#else
ig.Emit (OpCodes.Unbox, type);
LoadFromPtr (ig, type);
#endif
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
base.MutateHoistedGenericType (storey);
}
}
/// <summary>
/// This is used to perform explicit numeric conversions.
///
/// Explicit numeric conversions might trigger exceptions in a checked
/// context, so they should generate the conv.ovf opcodes instead of
/// conv opcodes.
/// </summary>
public class ConvCast : TypeCast {
public enum Mode : byte {
I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
U1_I1, U1_CH,
I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
U2_I1, U2_U1, U2_I2, U2_CH,
I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH, I8_I,
U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH, U8_I,
CH_I1, CH_U1, CH_I2,
R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4,
I_I8,
}
Mode mode;
public ConvCast (Expression child, Type return_type, Mode m)
: base (child, return_type)
{
mode = m;
}
public override Expression DoResolve (ResolveContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override string ToString ()
{
return String.Format ("ConvCast ({0}, {1})", mode, child);
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
base.Emit (ec);
if (ec.HasSet (EmitContext.Options.CheckedScope)) {
switch (mode){
case Mode.I1_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
case Mode.I1_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.I1_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
case Mode.I1_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
case Mode.I1_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.U1_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
case Mode.U1_CH: /* nothing */ break;
case Mode.I2_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
case Mode.I2_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
case Mode.I2_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.I2_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
case Mode.I2_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
case Mode.I2_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.U2_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
case Mode.U2_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
case Mode.U2_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
case Mode.U2_CH: /* nothing */ break;
case Mode.I4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
case Mode.I4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
case Mode.I4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
case Mode.I4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
case Mode.I4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.I4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
case Mode.I4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.U4_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
case Mode.U4_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
case Mode.U4_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
case Mode.U4_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
case Mode.U4_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
case Mode.U4_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
case Mode.I8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
case Mode.I8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
case Mode.I8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
case Mode.I8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.I8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
case Mode.I8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
case Mode.I8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
case Mode.I8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.I8_I: ig.Emit (OpCodes.Conv_Ovf_U); break;
case Mode.U8_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
case Mode.U8_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
case Mode.U8_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
case Mode.U8_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
case Mode.U8_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
case Mode.U8_U4: ig.Emit (OpCodes.Conv_Ovf_U4_Un); break;
case Mode.U8_I8: ig.Emit (OpCodes.Conv_Ovf_I8_Un); break;
case Mode.U8_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
case Mode.U8_I: ig.Emit (OpCodes.Conv_Ovf_U_Un); break;
case Mode.CH_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
case Mode.CH_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
case Mode.CH_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
case Mode.R4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
case Mode.R4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
case Mode.R4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
case Mode.R4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.R4_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
case Mode.R4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
case Mode.R4_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
case Mode.R4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
case Mode.R4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.R8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
case Mode.R8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
case Mode.R8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
case Mode.R8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.R8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
case Mode.R8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
case Mode.R8_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
case Mode.R8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
case Mode.R8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
case Mode.I_I8: ig.Emit (OpCodes.Conv_Ovf_I8_Un); break;
}
} else {
switch (mode){
case Mode.I1_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.I1_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.I1_U4: ig.Emit (OpCodes.Conv_U4); break;
case Mode.I1_U8: ig.Emit (OpCodes.Conv_I8); break;
case Mode.I1_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.U1_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.U1_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.I2_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.I2_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.I2_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.I2_U4: ig.Emit (OpCodes.Conv_U4); break;
case Mode.I2_U8: ig.Emit (OpCodes.Conv_I8); break;
case Mode.I2_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.U2_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.U2_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.U2_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.U2_CH: /* nothing */ break;
case Mode.I4_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.I4_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.I4_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.I4_U4: /* nothing */ break;
case Mode.I4_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.I4_U8: ig.Emit (OpCodes.Conv_I8); break;
case Mode.I4_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.U4_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.U4_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.U4_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.U4_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.U4_I4: /* nothing */ break;
case Mode.U4_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.I8_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.I8_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.I8_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.I8_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.I8_I4: ig.Emit (OpCodes.Conv_I4); break;
case Mode.I8_U4: ig.Emit (OpCodes.Conv_U4); break;
case Mode.I8_U8: /* nothing */ break;
case Mode.I8_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.I8_I: ig.Emit (OpCodes.Conv_U); break;
case Mode.U8_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.U8_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.U8_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.U8_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.U8_I4: ig.Emit (OpCodes.Conv_I4); break;
case Mode.U8_U4: ig.Emit (OpCodes.Conv_U4); break;
case Mode.U8_I8: /* nothing */ break;
case Mode.U8_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.U8_I: ig.Emit (OpCodes.Conv_U); break;
case Mode.CH_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.CH_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.CH_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.R4_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.R4_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.R4_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.R4_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.R4_I4: ig.Emit (OpCodes.Conv_I4); break;
case Mode.R4_U4: ig.Emit (OpCodes.Conv_U4); break;
case Mode.R4_I8: ig.Emit (OpCodes.Conv_I8); break;
case Mode.R4_U8: ig.Emit (OpCodes.Conv_U8); break;
case Mode.R4_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.R8_I1: ig.Emit (OpCodes.Conv_I1); break;
case Mode.R8_U1: ig.Emit (OpCodes.Conv_U1); break;
case Mode.R8_I2: ig.Emit (OpCodes.Conv_I2); break;
case Mode.R8_U2: ig.Emit (OpCodes.Conv_U2); break;
case Mode.R8_I4: ig.Emit (OpCodes.Conv_I4); break;
case Mode.R8_U4: ig.Emit (OpCodes.Conv_U4); break;
case Mode.R8_I8: ig.Emit (OpCodes.Conv_I8); break;
case Mode.R8_U8: ig.Emit (OpCodes.Conv_U8); break;
case Mode.R8_CH: ig.Emit (OpCodes.Conv_U2); break;
case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
case Mode.I_I8: ig.Emit (OpCodes.Conv_U8); break;
}
}
}
}
public class OpcodeCast : TypeCast {
readonly OpCode op;
public OpcodeCast (Expression child, Type return_type, OpCode op)
: base (child, return_type)
{
this.op = op;
}
public override Expression DoResolve (ResolveContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
ec.ig.Emit (op);
}
public Type UnderlyingType {
get { return child.Type; }
}
}
/// <summary>
/// This kind of cast is used to encapsulate a child and cast it
/// to the class requested
/// </summary>
public sealed class ClassCast : TypeCast {
readonly bool forced;
public ClassCast (Expression child, Type return_type)
: base (child, return_type)
{
}
public ClassCast (Expression child, Type return_type, bool forced)
: base (child, return_type)
{
this.forced = forced;
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
#if GMCS_SOURCE
bool gen = TypeManager.IsGenericParameter (child.Type);
if (gen)
ec.ig.Emit (OpCodes.Box, child.Type);
if (type.IsGenericParameter) {
ec.ig.Emit (OpCodes.Unbox_Any, type);
return;
}
if (gen && !forced)
return;
#endif
ec.ig.Emit (OpCodes.Castclass, type);
}
}
//
// Created during resolving pahse when an expression is wrapped or constantified
// and original expression can be used later (e.g. for expression trees)
//
public class ReducedExpression : Expression
{
sealed class ReducedConstantExpression : EmptyConstantCast
{
readonly Expression orig_expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("orig_expr", orig_expr);
}
public override string GetNameX()
{
return null;
}
public ReducedConstantExpression (Constant expr, Expression orig_expr)
: base (expr, expr.Type)
{
this.orig_expr = orig_expr;
}
public override Constant ConvertImplicitly (Type target_type)
{
Constant c = base.ConvertImplicitly (target_type);
if (c != null)
c = new ReducedConstantExpression (c, orig_expr);
return c;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return orig_expr.CreateExpressionTree (ec);
}
public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
//
// Even if resolved result is a constant original expression was not
// and attribute accepts constants only
//
Attribute.Error_AttributeArgumentNotValid (ec, orig_expr.Location);
value = null;
return false;
}
public override Constant ConvertExplicitly (bool in_checked_context, Type target_type)
{
Constant c = base.ConvertExplicitly (in_checked_context, target_type);
if (c != null)
c = new ReducedConstantExpression (c, orig_expr);
return c;
}
}
sealed class ReducedExpressionStatement : ExpressionStatement
{
readonly Expression orig_expr;
readonly ExpressionStatement stm;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("orig_expr", orig_expr).Single("stm", stm);
}
public override string GetNameX()
{
return null;
}
public ReducedExpressionStatement (ExpressionStatement stm, Expression orig)
{
this.orig_expr = orig;
this.stm = stm;
this.loc = orig.Location;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return orig_expr.CreateExpressionTree (ec);
}
public override Expression DoResolve (ResolveContext ec)
{
eclass = stm.eclass;
type = stm.Type;
return this;
}
public override void Emit (EmitContext ec)
{
stm.Emit (ec);
}
public override void EmitStatement (EmitContext ec)
{
stm.EmitStatement (ec);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
stm.MutateHoistedGenericType (storey);
}
}
readonly Expression expr, orig_expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("expr", expr).Single("orig_expr", orig_expr);
}
public override string GetNameX()
{
return null;
}
private ReducedExpression (Expression expr, Expression orig_expr)
{
this.expr = expr;
this.orig_expr = orig_expr;
this.loc = orig_expr.Location;
}
public static Constant Create (Constant expr, Expression original_expr)
{
return new ReducedConstantExpression (expr, original_expr);
}
public static ExpressionStatement Create (ExpressionStatement s, Expression orig)
{
return new ReducedExpressionStatement (s, orig);
}
public static Expression Create (Expression expr, Expression original_expr)
{
Constant c = expr as Constant;
if (c != null)
return Create (c, original_expr);
ExpressionStatement s = expr as ExpressionStatement;
if (s != null)
return Create (s, original_expr);
return new ReducedExpression (expr, original_expr);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return orig_expr.CreateExpressionTree (ec);
}
public override Expression DoResolve (ResolveContext ec)
{
eclass = expr.eclass;
type = expr.Type;
return this;
}
public override void Emit (EmitContext ec)
{
expr.Emit (ec);
}
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
expr.EmitBranchable (ec, target, on_true);
}
#if NET_4_0
public override SLE.Expression MakeExpression (BuilderContext ctx)
{
return orig_expr.MakeExpression (ctx);
}
#endif
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
expr.MutateHoistedGenericType (storey);
}
}
//
// Unresolved type name expressions
//
public abstract class ATypeNameExpression : FullNamedExpression
{
string name;
protected TypeArguments targs;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
if (targs != null)
{
return Visitable.Container().ManyUntyped("targs", targs.GetArgs());
}
return Visitable.Container();
}
public override string GetNameX()
{
return name;
}
protected ATypeNameExpression (string name, Location l)
{
this.name = name;
loc = l;
}
protected ATypeNameExpression (string name, TypeArguments targs, Location l)
{
this.name = name;
this.targs = targs;
loc = l;
}
public bool HasTypeArguments {
get {
return targs != null;
}
}
public override bool Equals (object obj)
{
ATypeNameExpression atne = obj as ATypeNameExpression;
return atne != null && atne.Name == Name &&
(targs == null || targs.Equals (atne.targs));
}
public override int GetHashCode ()
{
return Name.GetHashCode ();
}
public override string GetSignatureForError ()
{
if (targs != null) {
return TypeManager.RemoveGenericArity (Name) + "<" +
targs.GetSignatureForError () + ">";
}
return Name;
}
public string Name {
get {
return name;
}
set {
name = value;
}
}
public TypeArguments TypeArguments {
get {
return targs;
}
}
}
/// <summary>
/// SimpleName expressions are formed of a single word and only happen at the beginning
/// of a dotted-name.
/// </summary>
public class SimpleName : ATypeNameExpression {
bool in_transit;
public SimpleName (string name, Location l)
: base (name, l)
{
}
public SimpleName (string name, TypeArguments args, Location l)
: base (name, args, l)
{
}
public SimpleName (string name, TypeParameter[] type_params, Location l)
: base (name, l)
{
targs = new TypeArguments ();
foreach (TypeParameter type_param in type_params)
targs.Add (new TypeParameterExpr (type_param, l));
}
public static string RemoveGenericArity (string name)
{
int start = 0;
StringBuilder sb = null;
do {
int pos = name.IndexOf ('`', start);
if (pos < 0) {
if (start == 0)
return name;
sb.Append (name.Substring (start));
break;
}
if (sb == null)
sb = new StringBuilder ();
sb.Append (name.Substring (start, pos-start));
pos++;
while ((pos < name.Length) && Char.IsNumber (name [pos]))
pos++;
start = pos;
} while (start < name.Length);
return sb.ToString ();
}
public SimpleName GetMethodGroup ()
{
return new SimpleName (RemoveGenericArity (Name), targs, loc);
}
public static void Error_ObjectRefRequired (ResolveContext ec, Location l, string name)
{
if (ec.HasSet (ResolveContext.Options.FieldInitializerScope))
ec.Report.Error (236, l,
"A field initializer cannot reference the nonstatic field, method, or property `{0}'",
name);
else
ec.Report.Error (120, l,
"An object reference is required to access non-static member `{0}'",
name);
}
public bool IdenticalNameAndTypeName (IMemberContext mc, Expression resolved_to, Location loc)
{
return resolved_to != null && resolved_to.Type != null &&
resolved_to.Type.Name == Name &&
(mc.LookupNamespaceOrType (Name, loc, /* ignore_cs0104 = */ true) != null);
}
public override Expression DoResolve (ResolveContext ec)
{
return SimpleNameResolve (ec, null, false);
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
return SimpleNameResolve (ec, right_side, false);
}
public Expression DoResolve (ResolveContext ec, bool intermediate)
{
return SimpleNameResolve (ec, null, intermediate);
}
static bool IsNestedChild (Type t, Type parent)
{
while (parent != null) {
if (TypeManager.IsNestedChildOf (t, TypeManager.DropGenericTypeArguments (parent)))
return true;
parent = parent.BaseType;
}
return false;
}
FullNamedExpression ResolveNested (Type t)
{
if (!TypeManager.IsGenericTypeDefinition (t) && !TypeManager.IsGenericType (t))
return null;
Type ds = t;
while (ds != null && !IsNestedChild (t, ds))
ds = ds.DeclaringType;
if (ds == null)
return null;
Type[] gen_params = TypeManager.GetTypeArguments (t);
int arg_count = targs != null ? targs.Count : 0;
for (; (ds != null) && TypeManager.IsGenericType (ds); ds = ds.DeclaringType) {
Type[] gargs = TypeManager.GetTypeArguments (ds);
if (arg_count + gargs.Length == gen_params.Length) {
TypeArguments new_args = new TypeArguments ();
foreach (Type param in gargs)
new_args.Add (new TypeExpression (param, loc));
if (targs != null)
new_args.Add (targs);
return new GenericTypeExpr (t, new_args, loc);
}
}
return null;
}
public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
{
int errors = ec.Compiler.Report.Errors;
FullNamedExpression fne = ec.LookupNamespaceOrType (Name, loc, /*ignore_cs0104=*/ false);
if (fne != null) {
if (fne.Type == null)
return fne;
FullNamedExpression nested = ResolveNested (fne.Type);
if (nested != null)
return nested.ResolveAsTypeStep (ec, false);
if (targs != null) {
if (TypeManager.IsGenericType (fne.Type)) {
GenericTypeExpr ct = new GenericTypeExpr (fne.Type, targs, loc);
return ct.ResolveAsTypeStep (ec, false);
}
Namespace.Error_TypeArgumentsCannotBeUsed (fne, loc);
}
return fne;
}
if (!HasTypeArguments && Name == "dynamic" && RootContext.Version > LanguageVersion.V_3)
return new DynamicTypeExpr (loc);
if (silent || errors != ec.Compiler.Report.Errors)
return null;
Error_TypeOrNamespaceNotFound (ec);
return null;
}
protected virtual void Error_TypeOrNamespaceNotFound (IMemberContext ec)
{
if (ec.CurrentType != null) {
if (ec.CurrentTypeDefinition != null) {
MemberCore mc = ec.CurrentTypeDefinition.GetDefinition (Name);
if (mc != null) {
Error_UnexpectedKind (ec.Compiler.Report, mc, "type", GetMemberType (mc), loc);
return;
}
}
string ns = ec.CurrentType.Namespace;
string fullname = (ns.Length > 0) ? ns + "." + Name : Name;
foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
Type type = a.GetType (fullname);
if (type != null) {
ec.Compiler.Report.SymbolRelatedToPreviousError (type);
Expression.ErrorIsInaccesible (loc, TypeManager.CSharpName (type), ec.Compiler.Report);
return;
}
}
if (ec.CurrentTypeDefinition != null) {
Type t = ec.CurrentTypeDefinition.LookupAnyGeneric (Name);
if (t != null) {
Namespace.Error_InvalidNumberOfTypeArguments (t, loc);
return;
}
}
}
if (targs != null) {
FullNamedExpression retval = ec.LookupNamespaceOrType (SimpleName.RemoveGenericArity (Name), loc, true);
if (retval != null) {
Namespace.Error_TypeArgumentsCannotBeUsed (retval, loc);
return;
}
}
NamespaceEntry.Error_NamespaceNotFound (loc, Name, ec.Compiler.Report);
}
// TODO: I am still not convinced about this. If someone else will need it
// implement this as virtual property in MemberCore hierarchy
public static string GetMemberType (MemberCore mc)
{
if (mc is Property)
return "property";
if (mc is Indexer)
return "indexer";
if (mc is FieldBase)
return "field";
if (mc is MethodCore)
return "method";
if (mc is EnumMember)
return "enum";
if (mc is Event)
return "event";
return "type";
}
Expression SimpleNameResolve (ResolveContext ec, Expression right_side, bool intermediate)
{
if (in_transit)
return null;
in_transit = true;
Expression e = DoSimpleNameResolve (ec, right_side, intermediate);
in_transit = false;
if (e == null)
return null;
if (ec.CurrentBlock == null || ec.CurrentBlock.CheckInvariantMeaningInBlock (Name, e, Location))
return e;
return null;
}
/// <remarks>
/// 7.5.2: Simple Names.
///
/// Local Variables and Parameters are handled at
/// parse time, so they never occur as SimpleNames.
///
/// The `intermediate' flag is used by MemberAccess only
/// and it is used to inform us that it is ok for us to
/// avoid the static check, because MemberAccess might end
/// up resolving the Name as a Type name and the access as
/// a static type access.
///
/// ie: Type Type; .... { Type.GetType (""); }
///
/// Type is both an instance variable and a Type; Type.GetType
/// is the static method not an instance method of type.
/// </remarks>
Expression DoSimpleNameResolve (ResolveContext ec, Expression right_side, bool intermediate)
{
Expression e = null;
//
// Stage 1: Performed by the parser (binding to locals or parameters).
//
Block current_block = ec.CurrentBlock;
if (current_block != null){
LocalInfo vi = current_block.GetLocalInfo (Name);
if (vi != null){
LocalVariableReference var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
if (right_side != null) {
return var.ResolveLValue (ec, right_side);
} else {
ResolveFlags rf = ResolveFlags.VariableOrValue;
if (intermediate)
rf |= ResolveFlags.DisableFlowAnalysis;
return var.Resolve (ec, rf);
}
}
Expression expr = current_block.Toplevel.GetParameterReference (Name, loc);
if (expr != null) {
if (right_side != null)
return expr.ResolveLValue (ec, right_side);
return expr.Resolve (ec);
}
}
//
// Stage 2: Lookup members
//
Type almost_matched_type = null;
ArrayList almost_matched = null;
for (Type lookup_ds = ec.CurrentType; lookup_ds != null; lookup_ds = lookup_ds.DeclaringType) {
e = MemberLookup (ec.Compiler, ec.CurrentType, lookup_ds, Name, loc);
if (e != null) {
PropertyExpr pe = e as PropertyExpr;
if (pe != null) {
AParametersCollection param = TypeManager.GetParameterData (pe.PropertyInfo);
// since TypeManager.MemberLookup doesn't know if we're doing a lvalue access or not,
// it doesn't know which accessor to check permissions against
if (param.IsEmpty && pe.IsAccessibleFrom (ec.CurrentType, right_side != null))
break;
} else if (e is EventExpr) {
if (((EventExpr) e).IsAccessibleFrom (ec.CurrentType))
break;
} else if (targs != null && e is TypeExpression) {
e = new GenericTypeExpr (e.Type, targs, loc).ResolveAsTypeStep (ec, false);
break;
} else {
break;
}
e = null;
}
if (almost_matched == null && almost_matched_members.Count > 0) {
almost_matched_type = lookup_ds;
almost_matched = (ArrayList) almost_matched_members.Clone ();
}
}
if (e == null) {
if (almost_matched == null && almost_matched_members.Count > 0) {
almost_matched_type = ec.CurrentType;
almost_matched = (ArrayList) almost_matched_members.Clone ();
}
e = ResolveAsTypeStep (ec, true);
}
if (e == null) {
if (current_block != null) {
IKnownVariable ikv = current_block.Explicit.GetKnownVariable (Name);
if (ikv != null) {
LocalInfo li = ikv as LocalInfo;
// Supress CS0219 warning
if (li != null)
li.Used = true;
Error_VariableIsUsedBeforeItIsDeclared (ec.Report, Name);
return null;
}
}
if (RootContext.EvalMode){
FieldInfo fi = Evaluator.LookupField (Name);
if (fi != null)
return new FieldExpr (fi, loc).Resolve (ec);
}
if (almost_matched != null)
almost_matched_members = almost_matched;
if (almost_matched_type == null)
almost_matched_type = ec.CurrentType;
string type_name = ec.MemberContext.CurrentType == null ? null : ec.MemberContext.CurrentType.Name;
return Error_MemberLookupFailed (ec, ec.CurrentType, null, almost_matched_type, Name,
type_name, AllMemberTypes, AllBindingFlags);
}
if (e is MemberExpr) {
MemberExpr me = (MemberExpr) e;
Expression left;
if (me.IsInstance) {
if (ec.IsStatic || ec.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.BaseInitializer | ResolveContext.Options.ConstantScope)) {
//
// Note that an MemberExpr can be both IsInstance and IsStatic.
// An unresolved MethodGroupExpr can contain both kinds of methods
// and each predicate is true if the MethodGroupExpr contains
// at least one of that kind of method.
//
if (!me.IsStatic &&
(!intermediate || !IdenticalNameAndTypeName (ec, me, loc))) {
Error_ObjectRefRequired (ec, loc, me.GetSignatureForError ());
return null;
}
//
// Pass the buck to MemberAccess and Invocation.
//
left = EmptyExpression.Null;
} else {
left = ec.GetThis (loc);
}
} else {
left = new TypeExpression (ec.CurrentType, loc);
}
me = me.ResolveMemberAccess (ec, left, loc, null);
if (me == null)
return null;
if (targs != null) {
if (!targs.Resolve (ec))
return null;
me.SetTypeArguments (ec, targs);
}
if (!me.IsStatic && (me.InstanceExpression != null && me.InstanceExpression != EmptyExpression.Null) &&
TypeManager.IsNestedFamilyAccessible (me.InstanceExpression.Type, me.DeclaringType) &&
me.InstanceExpression.Type != me.DeclaringType &&
!TypeManager.IsFamilyAccessible (me.InstanceExpression.Type, me.DeclaringType) &&
(!intermediate || !IdenticalNameAndTypeName (ec, e, loc))) {
ec.Report.Error (38, loc, "Cannot access a nonstatic member of outer type `{0}' via nested type `{1}'",
TypeManager.CSharpName (me.DeclaringType), TypeManager.CSharpName (me.InstanceExpression.Type));
return null;
}
return (right_side != null)
? me.DoResolveLValue (ec, right_side)
: me.DoResolve (ec);
}
return e;
}
}
/// <summary>
/// Represents a namespace or a type. The name of the class was inspired by
/// section 10.8.1 (Fully Qualified Names).
/// </summary>
public abstract class FullNamedExpression : Expression
{
protected override void CloneTo (CloneContext clonectx, Expression target)
{
// Do nothing, most unresolved type expressions cannot be
// resolved to different type
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
throw new NotSupportedException ();
}
public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
{
return this;
}
public override void Emit (EmitContext ec)
{
throw new InternalErrorException ("FullNamedExpression `{0}' found in resolved tree",
GetSignatureForError ());
}
}
/// <summary>
/// Expression that evaluates to a type
/// </summary>
public abstract class TypeExpr : FullNamedExpression {
public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
{
TypeExpr t = DoResolveAsTypeStep (ec);
if (t == null)
return null;
eclass = ExprClass.Type;
return t;
}
override public Expression DoResolve (ResolveContext ec)
{
return ResolveAsTypeTerminal (ec, false);
}
public virtual bool CheckAccessLevel (IMemberContext mc)
{
return mc.CurrentTypeDefinition.CheckAccessLevel (Type);
}
public virtual bool IsClass {
get { return Type.IsClass; }
}
public virtual bool IsValueType {
get { return TypeManager.IsStruct (Type); }
}
public virtual bool IsInterface {
get { return Type.IsInterface; }
}
public virtual bool IsSealed {
get { return Type.IsSealed; }
}
public virtual bool CanInheritFrom ()
{
if (Type == TypeManager.enum_type ||
(Type == TypeManager.value_type && RootContext.StdLib) ||
Type == TypeManager.multicast_delegate_type ||
Type == TypeManager.delegate_type ||
Type == TypeManager.array_type)
return false;
return true;
}
protected abstract TypeExpr DoResolveAsTypeStep (IMemberContext ec);
public override bool Equals (object obj)
{
TypeExpr tobj = obj as TypeExpr;
if (tobj == null)
return false;
return Type == tobj.Type;
}
public override int GetHashCode ()
{
if (Type == null)
return 0;
return Type.GetHashCode ();
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
}
}
/// <summary>
/// Fully resolved Expression that already evaluated to a type
/// </summary>
public class TypeExpression : TypeExpr {
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public TypeExpression (Type t, Location l)
{
Type = t;
eclass = ExprClass.Type;
loc = l;
}
protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
{
return this;
}
public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
{
return this;
}
}
//
// Used to create types from a fully qualified name. These are just used
// by the parser to setup the core types.
//
public sealed class TypeLookupExpression : TypeExpr {
readonly string ns_name;
readonly string name;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().String("ns_name", ns_name).String("name", name);
}
public override string GetNameX()
{
return null;
}
public TypeLookupExpression (string ns, string name)
{
this.name = name;
this.ns_name = ns;
eclass = ExprClass.Type;
}
public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
{
//
// It's null only during mscorlib bootstrap when DefineType
// nees to resolve base type of same type
//
// For instance struct Char : IComparable<char>
//
// TODO: it could be removed when Resolve starts to use
// DeclSpace instead of Type
//
if (type == null) {
Namespace ns = GlobalRootNamespace.Instance.GetNamespace (ns_name, false);
FullNamedExpression fne = ns.Lookup (ec.Compiler, name, loc);
if (fne != null)
type = fne.Type;
}
return this;
}
protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
{
return this;
}
public override string GetSignatureForError ()
{
if (type == null)
return TypeManager.CSharpName (ns_name + "." + name, null);
return base.GetSignatureForError ();
}
}
/// <summary>
/// This class denotes an expression which evaluates to a member
/// of a struct or a class.
/// </summary>
public abstract class MemberExpr : Expression
{
protected bool is_base;
/// <summary>
/// The name of this member.
/// </summary>
public abstract string Name {
get;
}
//
// When base.member is used
//
public bool IsBase {
get { return is_base; }
set { is_base = value; }
}
/// <summary>
/// Whether this is an instance member.
/// </summary>
public abstract bool IsInstance {
get;
}
/// <summary>
/// Whether this is a static member.
/// </summary>
public abstract bool IsStatic {
get;
}
/// <summary>
/// The type which declares this member.
/// </summary>
public abstract Type DeclaringType {
get;
}
/// <summary>
/// The instance expression associated with this member, if it's a
/// non-static member.
/// </summary>
public Expression InstanceExpression;
public static void error176 (ResolveContext ec, Location loc, string name)
{
ec.Report.Error (176, loc, "Static member `{0}' cannot be accessed " +
"with an instance reference, qualify it with a type name instead", name);
}
public static void Error_BaseAccessInExpressionTree (ResolveContext ec, Location loc)
{
ec.Report.Error (831, loc, "An expression tree may not contain a base access");
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
if (InstanceExpression != null)
InstanceExpression.MutateHoistedGenericType (storey);
}
// TODO: possible optimalization
// Cache resolved constant result in FieldBuilder <-> expression map
public virtual MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, Location loc,
SimpleName original)
{
//
// Precondition:
// original == null || original.Resolve (...) ==> left
//
if (left is TypeExpr) {
left = left.ResolveAsBaseTerminal (ec, false);
if (left == null)
return null;
// TODO: Same problem as in class.cs, TypeTerminal does not
// always do all necessary checks
ObsoleteAttribute oa = AttributeTester.GetObsoleteAttribute (left.Type);
if (oa != null && !ec.IsObsolete) {
AttributeTester.Report_ObsoleteMessage (oa, left.GetSignatureForError (), loc, ec.Report);
}
GenericTypeExpr ct = left as GenericTypeExpr;
if (ct != null && !ct.CheckConstraints (ec))
return null;
//
if (!IsStatic) {
SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
return null;
}
return this;
}
if (!IsInstance) {
if (original != null && original.IdenticalNameAndTypeName (ec, left, loc))
return this;
return ResolveExtensionMemberAccess (ec, left);
}
InstanceExpression = left;
return this;
}
protected virtual MemberExpr ResolveExtensionMemberAccess (ResolveContext ec, Expression left)
{
error176 (ec, loc, GetSignatureForError ());
return this;
}
protected void EmitInstance (EmitContext ec, bool prepare_for_load)
{
if (IsStatic)
return;
if (InstanceExpression == EmptyExpression.Null) {
// FIXME: This should not be here at all
SimpleName.Error_ObjectRefRequired (new ResolveContext (ec.MemberContext), loc, GetSignatureForError ());
return;
}
if (TypeManager.IsValueType (InstanceExpression.Type)) {
if (InstanceExpression is IMemoryLocation) {
((IMemoryLocation) InstanceExpression).AddressOf (ec, AddressOp.LoadStore);
} else {
LocalTemporary t = new LocalTemporary (InstanceExpression.Type);
InstanceExpression.Emit (ec);
t.Store (ec);
t.AddressOf (ec, AddressOp.Store);
}
} else
InstanceExpression.Emit (ec);
if (prepare_for_load)
ec.ig.Emit (OpCodes.Dup);
}
public virtual void SetTypeArguments (ResolveContext ec, TypeArguments ta)
{
// TODO: need to get correct member type
ec.Report.Error (307, loc, "The property `{0}' cannot be used with type arguments",
GetSignatureForError ());
}
}
///
/// Represents group of extension methods
///
public class ExtensionMethodGroupExpr : MethodGroupExpr
{
readonly NamespaceEntry namespace_entry;
public Expression ExtensionExpression;
Argument extension_argument;
public ExtensionMethodGroupExpr (ArrayList list, NamespaceEntry n, Type extensionType, Location l)
: base (list, extensionType, l)
{
this.namespace_entry = n;
}
public override bool IsStatic {
get { return true; }
}
public bool IsTopLevel {
get { return namespace_entry == null; }
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
extension_argument.Expr.MutateHoistedGenericType (storey);
base.MutateHoistedGenericType (storey);
}
public override MethodGroupExpr OverloadResolve (ResolveContext ec, ref Arguments arguments, bool may_fail, Location loc)
{
if (arguments == null)
arguments = new Arguments (1);
arguments.Insert (0, new Argument (ExtensionExpression));
MethodGroupExpr mg = ResolveOverloadExtensions (ec, ref arguments, namespace_entry, loc);
// Store resolved argument and restore original arguments
if (mg != null)
((ExtensionMethodGroupExpr)mg).extension_argument = arguments [0];
else
arguments.RemoveAt (0); // Clean-up modified arguments for error reporting
return mg;
}
MethodGroupExpr ResolveOverloadExtensions (ResolveContext ec, ref Arguments arguments, NamespaceEntry ns, Location loc)
{
// Use normal resolve rules
MethodGroupExpr mg = base.OverloadResolve (ec, ref arguments, ns != null, loc);
if (mg != null)
return mg;
if (ns == null)
return null;
// Search continues
ExtensionMethodGroupExpr e = ns.LookupExtensionMethod (type, Name, loc);
if (e == null)
return base.OverloadResolve (ec, ref arguments, false, loc);
e.ExtensionExpression = ExtensionExpression;
e.SetTypeArguments (ec, type_arguments);
return e.ResolveOverloadExtensions (ec, ref arguments, e.namespace_entry, loc);
}
}
/// <summary>
/// MethodGroupExpr represents a group of method candidates which
/// can be resolved to the best method overload
/// </summary>
public class MethodGroupExpr : MemberExpr
{
public interface IErrorHandler
{
bool AmbiguousCall (ResolveContext ec, MethodBase ambiguous);
bool NoExactMatch (ResolveContext ec, MethodBase method);
}
public IErrorHandler CustomErrorHandler;
public MethodBase [] Methods;
MethodBase best_candidate;
// TODO: make private
public TypeArguments type_arguments;
bool identical_type_name;
bool has_inaccessible_candidates_only;
Type delegate_type;
Type queried_type;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public MethodGroupExpr (MemberInfo [] mi, Type type, Location l)
: this (type, l)
{
Methods = new MethodBase [mi.Length];
mi.CopyTo (Methods, 0);
}
public MethodGroupExpr (MemberInfo[] mi, Type type, Location l, bool inacessibleCandidatesOnly)
: this (mi, type, l)
{
has_inaccessible_candidates_only = inacessibleCandidatesOnly;
}
public MethodGroupExpr (ArrayList list, Type type, Location l)
: this (type, l)
{
try {
Methods = (MethodBase[])list.ToArray (typeof (MethodBase));
} catch {
foreach (MemberInfo m in list){
if (!(m is MethodBase)){
Console.WriteLine ("Name " + m.Name);
Console.WriteLine ("Found a: " + m.GetType ().FullName);
}
}
throw;
}
}
protected MethodGroupExpr (Type type, Location loc)
{
this.loc = loc;
eclass = ExprClass.MethodGroup;
this.type = InternalType.MethodGroup;
queried_type = type;
}
public override Type DeclaringType {
get {
return queried_type;
}
}
public Type DelegateType {
set {
delegate_type = value;
}
}
public bool IdenticalTypeName {
get {
return identical_type_name;
}
}
public override string GetSignatureForError ()
{
if (best_candidate != null)
return TypeManager.CSharpSignature (best_candidate);
return TypeManager.CSharpSignature (Methods [0]);
}
public override string Name {
get {
return Methods [0].Name;
}
}
public override bool IsInstance {
get {
if (best_candidate != null)
return !best_candidate.IsStatic;
foreach (MethodBase mb in Methods)
if (!mb.IsStatic)
return true;
return false;
}
}
public override bool IsStatic {
get {
if (best_candidate != null)
return best_candidate.IsStatic;
foreach (MethodBase mb in Methods)
if (mb.IsStatic)
return true;
return false;
}
}
public static explicit operator ConstructorInfo (MethodGroupExpr mg)
{
return (ConstructorInfo)mg.best_candidate;
}
public static explicit operator MethodInfo (MethodGroupExpr mg)
{
return (MethodInfo)mg.best_candidate;
}
//
// 7.4.3.3 Better conversion from expression
// Returns : 1 if a->p is better,
// 2 if a->q is better,
// 0 if neither is better
//
static int BetterExpressionConversion (ResolveContext ec, Argument a, Type p, Type q)
{
Type argument_type = TypeManager.TypeToCoreType (a.Type);
if (argument_type == InternalType.AnonymousMethod && RootContext.Version > LanguageVersion.ISO_2) {
//
// Uwrap delegate from Expression<T>
//
if (TypeManager.DropGenericTypeArguments (p) == TypeManager.expression_type) {
p = TypeManager.GetTypeArguments (p) [0];
}
if (TypeManager.DropGenericTypeArguments (q) == TypeManager.expression_type) {
q = TypeManager.GetTypeArguments (q) [0];
}
p = Delegate.GetInvokeMethod (ec.Compiler, null, p).ReturnType;
q = Delegate.GetInvokeMethod (ec.Compiler, null, q).ReturnType;
if (p == TypeManager.void_type && q != TypeManager.void_type)
return 2;
if (q == TypeManager.void_type && p != TypeManager.void_type)
return 1;
} else {
if (argument_type == p)
return 1;
if (argument_type == q)
return 2;
}
return BetterTypeConversion (ec, p, q);
}
//
// 7.4.3.4 Better conversion from type
//
public static int BetterTypeConversion (ResolveContext ec, Type p, Type q)
{
if (p == null || q == null)
throw new InternalErrorException ("BetterTypeConversion got a null conversion");
if (p == TypeManager.int32_type) {
if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
return 1;
} else if (p == TypeManager.int64_type) {
if (q == TypeManager.uint64_type)
return 1;
} else if (p == TypeManager.sbyte_type) {
if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
q == TypeManager.uint32_type || q == TypeManager.uint64_type)
return 1;
} else if (p == TypeManager.short_type) {
if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
q == TypeManager.uint64_type)
return 1;
}
if (q == TypeManager.int32_type) {
if (p == TypeManager.uint32_type || p == TypeManager.uint64_type)
return 2;
} if (q == TypeManager.int64_type) {
if (p == TypeManager.uint64_type)
return 2;
} else if (q == TypeManager.sbyte_type) {
if (p == TypeManager.byte_type || p == TypeManager.ushort_type ||
p == TypeManager.uint32_type || p == TypeManager.uint64_type)
return 2;
} if (q == TypeManager.short_type) {
if (p == TypeManager.ushort_type || p == TypeManager.uint32_type ||
p == TypeManager.uint64_type)
return 2;
}
// TODO: this is expensive
Expression p_tmp = new EmptyExpression (p);
Expression q_tmp = new EmptyExpression (q);
bool p_to_q = Convert.ImplicitConversionExists (ec, p_tmp, q);
bool q_to_p = Convert.ImplicitConversionExists (ec, q_tmp, p);
if (p_to_q && !q_to_p)
return 1;
if (q_to_p && !p_to_q)
return 2;
return 0;
}
/// <summary>
/// Determines "Better function" between candidate
/// and the current best match
/// </summary>
/// <remarks>
/// Returns a boolean indicating :
/// false if candidate ain't better
/// true if candidate is better than the current best match
/// </remarks>
static bool BetterFunction (ResolveContext ec, Arguments args, int argument_count,
MethodBase candidate, bool candidate_params,
MethodBase best, bool best_params)
{
AParametersCollection candidate_pd = TypeManager.GetParameterData (candidate);
AParametersCollection best_pd = TypeManager.GetParameterData (best);
bool better_at_least_one = false;
bool same = true;
for (int j = 0, c_idx = 0, b_idx = 0; j < argument_count; ++j, ++c_idx, ++b_idx)
{
Argument a = args [j];
// Provided default argument value is never better
if (a.IsDefaultArgument && candidate_params == best_params)
return false;
Type ct = candidate_pd.Types [c_idx];
Type bt = best_pd.Types [b_idx];
if (candidate_params && candidate_pd.FixedParameters [c_idx].ModFlags == Parameter.Modifier.PARAMS)
{
ct = TypeManager.GetElementType (ct);
--c_idx;
}
if (best_params && best_pd.FixedParameters [b_idx].ModFlags == Parameter.Modifier.PARAMS)
{
bt = TypeManager.GetElementType (bt);
--b_idx;
}
if (ct.Equals (bt))
continue;
same = false;
int result = BetterExpressionConversion (ec, a, ct, bt);
// for each argument, the conversion to 'ct' should be no worse than
// the conversion to 'bt'.
if (result == 2)
return false;
// for at least one argument, the conversion to 'ct' should be better than
// the conversion to 'bt'.
if (result != 0)
better_at_least_one = true;
}
if (better_at_least_one)
return true;
//
// This handles the case
//
// Add (float f1, float f2, float f3);
// Add (params decimal [] foo);
//
// The call Add (3, 4, 5) should be ambiguous. Without this check, the
// first candidate would've chosen as better.
//
if (!same)
return false;
//
// The two methods have equal parameter types. Now apply tie-breaking rules
//
if (TypeManager.IsGenericMethod (best)) {
if (!TypeManager.IsGenericMethod (candidate))
return true;
} else if (TypeManager.IsGenericMethod (candidate)) {
return false;
}
//
// This handles the following cases:
//
// Trim () is better than Trim (params char[] chars)
// Concat (string s1, string s2, string s3) is better than
// Concat (string s1, params string [] srest)
// Foo (int, params int [] rest) is better than Foo (params int [] rest)
//
if (!candidate_params && best_params)
return true;
if (candidate_params && !best_params)
return false;
int candidate_param_count = candidate_pd.Count;
int best_param_count = best_pd.Count;
if (candidate_param_count != best_param_count)
// can only happen if (candidate_params && best_params)
return candidate_param_count > best_param_count && best_pd.HasParams;
//
// now, both methods have the same number of parameters, and the parameters have the same types
// Pick the "more specific" signature
//
MethodBase orig_candidate = TypeManager.DropGenericMethodArguments (candidate);
MethodBase orig_best = TypeManager.DropGenericMethodArguments (best);
AParametersCollection orig_candidate_pd = TypeManager.GetParameterData (orig_candidate);
AParametersCollection orig_best_pd = TypeManager.GetParameterData (orig_best);
bool specific_at_least_once = false;
for (int j = 0; j < candidate_param_count; ++j)
{
Type ct = orig_candidate_pd.Types [j];
Type bt = orig_best_pd.Types [j];
if (ct.Equals (bt))
continue;
Type specific = MoreSpecific (ct, bt);
if (specific == bt)
return false;
if (specific == ct)
specific_at_least_once = true;
}
if (specific_at_least_once)
return true;
// FIXME: handle lifted operators
// ...
return false;
}
protected override MemberExpr ResolveExtensionMemberAccess (ResolveContext ec, Expression left)
{
if (!IsStatic)
return base.ResolveExtensionMemberAccess (ec, left);
//
// When left side is an expression and at least one candidate method is
// static, it can be extension method
//
InstanceExpression = left;
return this;
}
public override MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, Location loc,
SimpleName original)
{
if (!(left is TypeExpr) &&
original != null && original.IdenticalNameAndTypeName (ec, left, loc))
identical_type_name = true;
return base.ResolveMemberAccess (ec, left, loc, original);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
if (best_candidate == null) {
ec.Report.Error (1953, loc, "An expression tree cannot contain an expression with method group");
return null;
}
IMethodData md = TypeManager.GetMethod (best_candidate);
if (md != null && md.IsExcluded ())
ec.Report.Error (765, loc,
"Partial methods with only a defining declaration or removed conditional methods cannot be used in an expression tree");
return new TypeOfMethod (best_candidate, loc);
}
override public Expression DoResolve (ResolveContext ec)
{
if (InstanceExpression != null) {
InstanceExpression = InstanceExpression.DoResolve (ec);
if (InstanceExpression == null)
return null;
}
return this;
}
public void ReportUsageError (ResolveContext ec)
{
ec.Report.Error (654, loc, "Method `" + DeclaringType + "." +
Name + "()' is referenced without parentheses");
}
override public void Emit (EmitContext ec)
{
throw new NotSupportedException ();
// ReportUsageError ();
}
public void EmitCall (EmitContext ec, Arguments arguments)
{
Invocation.EmitCall (ec, IsBase, InstanceExpression, best_candidate, arguments, loc);
}
void Error_AmbiguousCall (ResolveContext ec, MethodBase ambiguous)
{
if (CustomErrorHandler != null && CustomErrorHandler.AmbiguousCall (ec, ambiguous))
return;
ec.Report.SymbolRelatedToPreviousError (best_candidate);
ec.Report.Error (121, loc, "The call is ambiguous between the following methods or properties: `{0}' and `{1}'",
TypeManager.CSharpSignature (ambiguous), TypeManager.CSharpSignature (best_candidate));
}
protected virtual void Error_InvalidArguments (ResolveContext ec, Location loc, int idx, MethodBase method,
Argument a, AParametersCollection expected_par, Type paramType)
{
ExtensionMethodGroupExpr emg = this as ExtensionMethodGroupExpr;
if (a is CollectionElementInitializer.ElementInitializerArgument) {
ec.Report.SymbolRelatedToPreviousError (method);
if ((expected_par.FixedParameters [idx].ModFlags & Parameter.Modifier.ISBYREF) != 0) {
ec.Report.Error (1954, loc, "The best overloaded collection initalizer method `{0}' cannot have 'ref', or `out' modifier",
TypeManager.CSharpSignature (method));
return;
}
ec.Report.Error (1950, loc, "The best overloaded collection initalizer method `{0}' has some invalid arguments",
TypeManager.CSharpSignature (method));
} else if (TypeManager.IsDelegateType (method.DeclaringType)) {
ec.Report.Error (1594, loc, "Delegate `{0}' has some invalid arguments",
TypeManager.CSharpName (method.DeclaringType));
} else {
ec.Report.SymbolRelatedToPreviousError (method);
if (emg != null) {
ec.Report.Error (1928, loc,
"Type `{0}' does not contain a member `{1}' and the best extension method overload `{2}' has some invalid arguments",
emg.ExtensionExpression.GetSignatureForError (),
emg.Name, TypeManager.CSharpSignature (method));
} else {
ec.Report.Error (1502, loc, "The best overloaded method match for `{0}' has some invalid arguments",
TypeManager.CSharpSignature (method));
}
}
Parameter.Modifier mod = idx >= expected_par.Count ? 0 : expected_par.FixedParameters [idx].ModFlags;
string index = (idx + 1).ToString ();
if (((mod & (Parameter.Modifier.REF | Parameter.Modifier.OUT)) ^
(a.Modifier & (Parameter.Modifier.REF | Parameter.Modifier.OUT))) != 0) {
if ((mod & Parameter.Modifier.ISBYREF) == 0)
ec.Report.Error (1615, loc, "Argument `#{0}' does not require `{1}' modifier. Consider removing `{1}' modifier",
index, Parameter.GetModifierSignature (a.Modifier));
else
ec.Report.Error (1620, loc, "Argument `#{0}' is missing `{1}' modifier",
index, Parameter.GetModifierSignature (mod));
} else {
string p1 = a.GetSignatureForError ();
string p2 = TypeManager.CSharpName (paramType);
if (p1 == p2) {
ec.Report.ExtraInformation (loc, "(equally named types possibly from different assemblies in previous ");
ec.Report.SymbolRelatedToPreviousError (a.Expr.Type);
ec.Report.SymbolRelatedToPreviousError (paramType);
}
if (idx == 0 && emg != null) {
ec.Report.Error (1929, loc,
"Extension method instance type `{0}' cannot be converted to `{1}'", p1, p2);
} else {
ec.Report.Error (1503, loc,
"Argument `#{0}' cannot convert `{1}' expression to type `{2}'", index, p1, p2);
}
}
}
public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, Type target, bool expl)
{
ec.Report.Error (428, loc, "Cannot convert method group `{0}' to non-delegate type `{1}'. Consider using parentheses to invoke the method",
Name, TypeManager.CSharpName (target));
}
void Error_ArgumentCountWrong (ResolveContext ec, int arg_count)
{
ec.Report.Error (1501, loc, "No overload for method `{0}' takes `{1}' arguments",
Name, arg_count.ToString ());
}
protected virtual int GetApplicableParametersCount (MethodBase method, AParametersCollection parameters)
{
return parameters.Count;
}
public static bool IsAncestralType (Type first_type, Type second_type)
{
return first_type != second_type &&
(TypeManager.IsSubclassOf (second_type, first_type) ||
TypeManager.ImplementsInterface (second_type, first_type));
}
///
/// Determines if the candidate method is applicable (section 14.4.2.1)
/// to the given set of arguments
/// A return value rates candidate method compatibility,
/// 0 = the best, int.MaxValue = the worst
///
public int IsApplicable (ResolveContext ec,
ref Arguments arguments, int arg_count, ref MethodBase method, ref bool params_expanded_form)
{
MethodBase candidate = method;
AParametersCollection pd = TypeManager.GetParameterData (candidate);
int param_count = GetApplicableParametersCount (candidate, pd);
int optional_count = 0;
if (arg_count != param_count) {
for (int i = 0; i < pd.Count; ++i) {
if (pd.FixedParameters [i].HasDefaultValue) {
optional_count = pd.Count - i;
break;
}
}
int args_gap = Math.Abs (arg_count - param_count);
if (optional_count != 0) {
if (args_gap > optional_count)
return int.MaxValue - 10000 + args_gap - optional_count;
// Readjust expected number when params used
if (pd.HasParams) {
optional_count--;
if (arg_count < param_count)
param_count--;
} else if (arg_count > param_count) {
return int.MaxValue - 10000 + args_gap;
}
} else if (arg_count != param_count) {
if (!pd.HasParams)
return int.MaxValue - 10000 + args_gap;
if (arg_count < param_count - 1)
return int.MaxValue - 10000 + args_gap;
}
// Initialize expanded form of a method with 1 params parameter
params_expanded_form = param_count == 1 && pd.HasParams;
// Resize to fit optional arguments
if (optional_count != 0) {
Arguments resized;
if (arguments == null) {
resized = new Arguments (optional_count);
} else {
resized = new Arguments (param_count);
resized.AddRange (arguments);
}
for (int i = arg_count; i < param_count; ++i)
resized.Add (null);
arguments = resized;
}
}
if (arg_count > 0) {
//
// Shuffle named arguments to the right positions if there are any
//
if (arguments [arg_count - 1] is NamedArgument) {
arg_count = arguments.Count;
for (int i = 0; i < arg_count; ++i) {
bool arg_moved = false;
while (true) {
NamedArgument na = arguments[i] as NamedArgument;
if (na == null)
break;
int index = pd.GetParameterIndexByName (na.Name.Value);
// Named parameter not found or already reordered
if (index <= i)
break;
// When using parameters which should not be available to the user
if (index >= param_count)
break;
if (!arg_moved) {
arguments.MarkReorderedArgument (na);
arg_moved = true;
}
Argument temp = arguments[index];
arguments[index] = arguments[i];
arguments[i] = temp;
if (temp == null)
break;
}
}
} else {
arg_count = arguments.Count;
}
} else if (arguments != null) {
arg_count = arguments.Count;
}
#if GMCS_SOURCE
//
// 1. Handle generic method using type arguments when specified or type inference
//
if (TypeManager.IsGenericMethod (candidate)) {
if (type_arguments != null) {
Type [] g_args = candidate.GetGenericArguments ();
if (g_args.Length != type_arguments.Count)
return int.MaxValue - 20000 + Math.Abs (type_arguments.Count - g_args.Length);
// TODO: Don't create new method, create Parameters only
method = ((MethodInfo) candidate).MakeGenericMethod (type_arguments.Arguments);
candidate = method;
pd = TypeManager.GetParameterData (candidate);
} else {
int score = TypeManager.InferTypeArguments (ec, arguments, ref candidate);
if (score != 0)
return score - 20000;
if (TypeManager.IsGenericMethodDefinition (candidate))
throw new InternalErrorException ("A generic method `{0}' definition took part in overload resolution",
TypeManager.CSharpSignature (candidate));
pd = TypeManager.GetParameterData (candidate);
}
} else {
if (type_arguments != null)
return int.MaxValue - 15000;
}
#endif
//
// 2. Each argument has to be implicitly convertible to method parameter
//
method = candidate;
Parameter.Modifier p_mod = 0;
Type pt = null;
for (int i = 0; i < arg_count; i++) {
Argument a = arguments [i];
if (a == null) {
if (!pd.FixedParameters [i].HasDefaultValue)
throw new InternalErrorException ();
Expression e = pd.FixedParameters [i].DefaultValue as Constant;
if (e == null)
e = new DefaultValueExpression (new TypeExpression (pd.Types [i], loc), loc).Resolve (ec);
arguments [i] = new Argument (e, Argument.AType.Default);
continue;
}
if (p_mod != Parameter.Modifier.PARAMS) {
p_mod = pd.FixedParameters [i].ModFlags & ~(Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
pt = pd.Types [i];
} else {
params_expanded_form = true;
}
Parameter.Modifier a_mod = a.Modifier & ~(Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
int score = 1;
if (!params_expanded_form)
score = IsArgumentCompatible (ec, a_mod, a, p_mod & ~Parameter.Modifier.PARAMS, pt);
if (score != 0 && (p_mod & Parameter.Modifier.PARAMS) != 0 && delegate_type == null) {
// It can be applicable in expanded form
score = IsArgumentCompatible (ec, a_mod, a, 0, TypeManager.GetElementType (pt));
if (score == 0)
params_expanded_form = true;
}
if (score != 0) {
if (params_expanded_form)
++score;
return (arg_count - i) * 2 + score;
}
}
if (arg_count != param_count)
params_expanded_form = true;
return 0;
}
int IsArgumentCompatible (ResolveContext ec, Parameter.Modifier arg_mod, Argument argument, Parameter.Modifier param_mod, Type parameter)
{
//
// Types have to be identical when ref or out modifer is used
//
if (arg_mod != 0 || param_mod != 0) {
if (TypeManager.HasElementType (parameter))
parameter = TypeManager.GetElementType (parameter);
Type a_type = argument.Type;
if (TypeManager.HasElementType (a_type))
a_type = TypeManager.GetElementType (a_type);
if (a_type != parameter)
return 2;
} else {
if (!Convert.ImplicitConversionExists (ec, argument.Expr, parameter))
return 2;
}
if (arg_mod != param_mod)
return 1;
return 0;
}
public static bool IsOverride (MethodBase cand_method, MethodBase base_method)
{
if (!IsAncestralType (base_method.DeclaringType, cand_method.DeclaringType))
return false;
AParametersCollection cand_pd = TypeManager.GetParameterData (cand_method);
AParametersCollection base_pd = TypeManager.GetParameterData (base_method);
if (cand_pd.Count != base_pd.Count)
return false;
for (int j = 0; j < cand_pd.Count; ++j)
{
Parameter.Modifier cm = cand_pd.FixedParameters [j].ModFlags;
Parameter.Modifier bm = base_pd.FixedParameters [j].ModFlags;
Type ct = cand_pd.Types [j];
Type bt = base_pd.Types [j];
if (cm != bm || ct != bt)
return false;
}
return true;
}
public static MethodGroupExpr MakeUnionSet (MethodGroupExpr mg1, MethodGroupExpr mg2, Location loc)
{
if (mg1 == null) {
if (mg2 == null)
return null;
return mg2;
}
if (mg2 == null)
return mg1;
ArrayList all = new ArrayList (mg1.Methods);
foreach (MethodBase m in mg2.Methods){
if (!TypeManager.ArrayContainsMethod (mg1.Methods, m, false))
all.Add (m);
}
return new MethodGroupExpr (all, null, loc);
}
static Type MoreSpecific (Type p, Type q)
{
if (TypeManager.IsGenericParameter (p) && !TypeManager.IsGenericParameter (q))
return q;
if (!TypeManager.IsGenericParameter (p) && TypeManager.IsGenericParameter (q))
return p;
if (TypeManager.HasElementType (p))
{
Type pe = TypeManager.GetElementType (p);
Type qe = TypeManager.GetElementType (q);
Type specific = MoreSpecific (pe, qe);
if (specific == pe)
return p;
if (specific == qe)
return q;
}
else if (TypeManager.IsGenericType (p))
{
Type[] pargs = TypeManager.GetTypeArguments (p);
Type[] qargs = TypeManager.GetTypeArguments (q);
bool p_specific_at_least_once = false;
bool q_specific_at_least_once = false;
for (int i = 0; i < pargs.Length; i++)
{
Type specific = MoreSpecific (TypeManager.TypeToCoreType (pargs [i]), TypeManager.TypeToCoreType (qargs [i]));
if (specific == pargs [i])
p_specific_at_least_once = true;
if (specific == qargs [i])
q_specific_at_least_once = true;
}
if (p_specific_at_least_once && !q_specific_at_least_once)
return p;
if (!p_specific_at_least_once && q_specific_at_least_once)
return q;
}
return null;
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
base.MutateHoistedGenericType (storey);
MethodInfo mi = best_candidate as MethodInfo;
if (mi != null) {
best_candidate = storey.MutateGenericMethod (mi);
return;
}
best_candidate = storey.MutateConstructor ((ConstructorInfo) this);
}
/// <summary>
/// Find the Applicable Function Members (7.4.2.1)
///
/// me: Method Group expression with the members to select.
/// it might contain constructors or methods (or anything
/// that maps to a method).
///
/// Arguments: ArrayList containing resolved Argument objects.
///
/// loc: The location if we want an error to be reported, or a Null
/// location for "probing" purposes.
///
/// Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
/// that is the best match of me on Arguments.
///
/// </summary>
public virtual MethodGroupExpr OverloadResolve (ResolveContext ec, ref Arguments Arguments,
bool may_fail, Location loc)
{
bool method_params = false;
Type applicable_type = null;
ArrayList candidates = new ArrayList (2);
ArrayList candidate_overrides = null;
//
// Used to keep a map between the candidate
// and whether it is being considered in its
// normal or expanded form
//
// false is normal form, true is expanded form
//
Hashtable candidate_to_form = null;
Hashtable candidates_expanded = null;
Arguments candidate_args = Arguments;
int arg_count = Arguments != null ? Arguments.Count : 0;
if (RootContext.Version == LanguageVersion.ISO_1 && Name == "Invoke" && TypeManager.IsDelegateType (DeclaringType)) {
if (!may_fail)
ec.Report.Error (1533, loc, "Invoke cannot be called directly on a delegate");
return null;
}
int nmethods = Methods.Length;
if (!IsBase) {
//
// Methods marked 'override' don't take part in 'applicable_type'
// computation, nor in the actual overload resolution.
// However, they still need to be emitted instead of a base virtual method.
// So, we salt them away into the 'candidate_overrides' array.
//
// In case of reflected methods, we replace each overriding method with
// its corresponding base virtual method. This is to improve compatibility
// with non-C# libraries which change the visibility of overrides (#75636)
//
int j = 0;
for (int i = 0; i < Methods.Length; ++i) {
MethodBase m = Methods [i];
if (TypeManager.IsOverride (m)) {
if (candidate_overrides == null)
candidate_overrides = new ArrayList ();
candidate_overrides.Add (m);
m = TypeManager.TryGetBaseDefinition (m);
}
if (m != null)
Methods [j++] = m;
}
nmethods = j;
}
//
// Enable message recording, it's used mainly by lambda expressions
//
SessionReportPrinter msg_recorder = new SessionReportPrinter ();
ReportPrinter prev_recorder = ec.Report.SetPrinter (msg_recorder);
//
// First we construct the set of applicable methods
//
bool is_sorted = true;
int best_candidate_rate = int.MaxValue;
for (int i = 0; i < nmethods; i++) {
Type decl_type = Methods [i].DeclaringType;
//
// If we have already found an applicable method
// we eliminate all base types (Section 14.5.5.1)
//
if (applicable_type != null && IsAncestralType (decl_type, applicable_type))
continue;
//
// Check if candidate is applicable (section 14.4.2.1)
//
bool params_expanded_form = false;
int candidate_rate = IsApplicable (ec, ref candidate_args, arg_count, ref Methods [i], ref params_expanded_form);
if (candidate_rate < best_candidate_rate) {
best_candidate_rate = candidate_rate;
best_candidate = Methods [i];
}
if (params_expanded_form) {
if (candidate_to_form == null)
candidate_to_form = new PtrHashtable ();
MethodBase candidate = Methods [i];
candidate_to_form [candidate] = candidate;
}
if (candidate_args != Arguments) {
if (candidates_expanded == null)
candidates_expanded = new Hashtable (2);
candidates_expanded.Add (Methods [i], candidate_args);
candidate_args = Arguments;
}
if (candidate_rate != 0 || has_inaccessible_candidates_only) {
if (msg_recorder != null)
msg_recorder.EndSession ();
continue;
}
msg_recorder = null;
candidates.Add (Methods [i]);
if (applicable_type == null)
applicable_type = decl_type;
else if (applicable_type != decl_type) {
is_sorted = false;
if (IsAncestralType (applicable_type, decl_type))
applicable_type = decl_type;
}
}
ec.Report.SetPrinter (prev_recorder);
if (msg_recorder != null && !msg_recorder.IsEmpty) {
if (!may_fail)
msg_recorder.Merge (prev_recorder);
return null;
}
int candidate_top = candidates.Count;
if (applicable_type == null) {
//
// When we found a top level method which does not match and it's
// not an extension method. We start extension methods lookup from here
//
if (InstanceExpression != null) {
ExtensionMethodGroupExpr ex_method_lookup = ec.LookupExtensionMethod (type, Name, loc);
if (ex_method_lookup != null) {
ex_method_lookup.ExtensionExpression = InstanceExpression;
ex_method_lookup.SetTypeArguments (ec, type_arguments);
return ex_method_lookup.OverloadResolve (ec, ref Arguments, may_fail, loc);
}
}
if (may_fail)
return null;
//
// Okay so we have failed to find exact match so we
// return error info about the closest match
//
if (best_candidate != null) {
if (CustomErrorHandler != null && !has_inaccessible_candidates_only && CustomErrorHandler.NoExactMatch (ec, best_candidate))
return null;
AParametersCollection pd = TypeManager.GetParameterData (best_candidate);
bool cand_params = candidate_to_form != null && candidate_to_form.Contains (best_candidate);
if (arg_count == pd.Count || pd.HasParams) {
if (TypeManager.IsGenericMethodDefinition (best_candidate)) {
if (type_arguments == null) {
ec.Report.Error (411, loc,
"The type arguments for method `{0}' cannot be inferred from " +
"the usage. Try specifying the type arguments explicitly",
TypeManager.CSharpSignature (best_candidate));
return null;
}
Type[] g_args = TypeManager.GetGenericArguments (best_candidate);
if (type_arguments.Count != g_args.Length) {
ec.Report.SymbolRelatedToPreviousError (best_candidate);
ec.Report.Error (305, loc, "Using the generic method `{0}' requires `{1}' type argument(s)",
TypeManager.CSharpSignature (best_candidate),
g_args.Length.ToString ());
return null;
}
} else {
if (type_arguments != null && !TypeManager.IsGenericMethod (best_candidate)) {
Namespace.Error_TypeArgumentsCannotBeUsed (best_candidate, loc);
return null;
}
}
if (has_inaccessible_candidates_only) {
if (InstanceExpression != null && type != ec.CurrentType && TypeManager.IsNestedFamilyAccessible (ec.CurrentType, best_candidate.DeclaringType)) {
// Although a derived class can access protected members of
// its base class it cannot do so through an instance of the
// base class (CS1540). If the qualifier_type is a base of the
// ec.CurrentType and the lookup succeeds with the latter one,
// then we are in this situation.
Error_CannotAccessProtected (ec, loc, best_candidate, queried_type, ec.CurrentType);
} else {
ec.Report.SymbolRelatedToPreviousError (best_candidate);
ErrorIsInaccesible (loc, GetSignatureForError (), ec.Report);
}
}
if (!VerifyArgumentsCompat (ec, ref Arguments, arg_count, best_candidate, cand_params, may_fail, loc))
return null;
if (has_inaccessible_candidates_only)
return null;
throw new InternalErrorException ("VerifyArgumentsCompat didn't find any problem with rejected candidate " + best_candidate);
}
}
//
// We failed to find any method with correct argument count
//
if (Name == ConstructorInfo.ConstructorName) {
ec.Report.SymbolRelatedToPreviousError (queried_type);
ec.Report.Error (1729, loc,
"The type `{0}' does not contain a constructor that takes `{1}' arguments",
TypeManager.CSharpName (queried_type), arg_count);
} else {
Error_ArgumentCountWrong (ec, arg_count);
}
return null;
}
if (!is_sorted) {
//
// At this point, applicable_type is _one_ of the most derived types
// in the set of types containing the methods in this MethodGroup.
// Filter the candidates so that they only contain methods from the
// most derived types.
//
int finalized = 0; // Number of finalized candidates
do {
// Invariant: applicable_type is a most derived type
// We'll try to complete Section 14.5.5.1 for 'applicable_type' by
// eliminating all it's base types. At the same time, we'll also move
// every unrelated type to the end of the array, and pick the next
// 'applicable_type'.
Type next_applicable_type = null;
int j = finalized; // where to put the next finalized candidate
int k = finalized; // where to put the next undiscarded candidate
for (int i = finalized; i < candidate_top; ++i) {
MethodBase candidate = (MethodBase) candidates [i];
Type decl_type = candidate.DeclaringType;
if (decl_type == applicable_type) {
candidates [k++] = candidates [j];
candidates [j++] = candidates [i];
continue;
}
if (IsAncestralType (decl_type, applicable_type))
continue;
if (next_applicable_type != null &&
IsAncestralType (decl_type, next_applicable_type))
continue;
candidates [k++] = candidates [i];
if (next_applicable_type == null ||
IsAncestralType (next_applicable_type, decl_type))
next_applicable_type = decl_type;
}
applicable_type = next_applicable_type;
finalized = j;
candidate_top = k;
} while (applicable_type != null);
}
//
// Now we actually find the best method
//
best_candidate = (MethodBase) candidates [0];
method_params = candidate_to_form != null && candidate_to_form.Contains (best_candidate);
//
// TODO: Broken inverse order of candidates logic does not work with optional
// parameters used for method overrides and I am not going to fix it for SRE
//
if (candidates_expanded != null && candidates_expanded.Contains (best_candidate)) {
candidate_args = (Arguments) candidates_expanded [best_candidate];
arg_count = candidate_args.Count;
}
for (int ix = 1; ix < candidate_top; ix++) {
MethodBase candidate = (MethodBase) candidates [ix];
if (candidate == best_candidate)
continue;
bool cand_params = candidate_to_form != null && candidate_to_form.Contains (candidate);
if (BetterFunction (ec, candidate_args, arg_count,
candidate, cand_params,
best_candidate, method_params)) {
best_candidate = candidate;
method_params = cand_params;
}
}
//
// Now check that there are no ambiguities i.e the selected method
// should be better than all the others
//
MethodBase ambiguous = null;
for (int ix = 1; ix < candidate_top; ix++) {
MethodBase candidate = (MethodBase) candidates [ix];
if (candidate == best_candidate)
continue;
bool cand_params = candidate_to_form != null && candidate_to_form.Contains (candidate);
if (!BetterFunction (ec, candidate_args, arg_count,
best_candidate, method_params,
candidate, cand_params))
{
if (!may_fail)
ec.Report.SymbolRelatedToPreviousError (candidate);
ambiguous = candidate;
}
}
if (ambiguous != null) {
Error_AmbiguousCall (ec, ambiguous);
return this;
}
//
// If the method is a virtual function, pick an override closer to the LHS type.
//
if (!IsBase && best_candidate.IsVirtual) {
if (TypeManager.IsOverride (best_candidate))
throw new InternalErrorException (
"Should not happen. An 'override' method took part in overload resolution: " + best_candidate);
if (candidate_overrides != null) {
Type[] gen_args = null;
bool gen_override = false;
if (TypeManager.IsGenericMethod (best_candidate))
gen_args = TypeManager.GetGenericArguments (best_candidate);
foreach (MethodBase candidate in candidate_overrides) {
if (TypeManager.IsGenericMethod (candidate)) {
if (gen_args == null)
continue;
if (gen_args.Length != TypeManager.GetGenericArguments (candidate).Length)
continue;
} else {
if (gen_args != null)
continue;
}
if (IsOverride (candidate, best_candidate)) {
gen_override = true;
best_candidate = candidate;
}
}
if (gen_override && gen_args != null) {
#if GMCS_SOURCE
best_candidate = ((MethodInfo) best_candidate).MakeGenericMethod (gen_args);
#endif
}
}
}
//
// And now check if the arguments are all
// compatible, perform conversions if
// necessary etc. and return if everything is
// all right
//
if (!VerifyArgumentsCompat (ec, ref candidate_args, arg_count, best_candidate,
method_params, may_fail, loc))
return null;
if (best_candidate == null)
return null;
MethodBase the_method = TypeManager.DropGenericMethodArguments (best_candidate);
if (TypeManager.IsGenericMethodDefinition (the_method) &&
!ConstraintChecker.CheckConstraints (ec, the_method, best_candidate, loc))
return null;
//
// Check ObsoleteAttribute on the best method
//
ObsoleteAttribute oa = AttributeTester.GetMethodObsoleteAttribute (the_method);
if (oa != null && !ec.IsObsolete)
AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, ec.Report);
IMethodData data = TypeManager.GetMethod (the_method);
if (data != null)
data.SetMemberIsUsed ();
Arguments = candidate_args;
return this;
}
public override void SetTypeArguments (ResolveContext ec, TypeArguments ta)
{
type_arguments = ta;
}
public bool VerifyArgumentsCompat (ResolveContext ec, ref Arguments arguments,
int arg_count, MethodBase method,
bool chose_params_expanded,
bool may_fail, Location loc)
{
AParametersCollection pd = TypeManager.GetParameterData (method);
int param_count = GetApplicableParametersCount (method, pd);
int errors = ec.Report.Errors;
Parameter.Modifier p_mod = 0;
Type pt = null;
int a_idx = 0, a_pos = 0;
Argument a = null;
ArrayList params_initializers = null;
bool has_unsafe_arg = false;
for (; a_idx < arg_count; a_idx++, ++a_pos) {
a = arguments [a_idx];
if (p_mod != Parameter.Modifier.PARAMS) {
p_mod = pd.FixedParameters [a_idx].ModFlags;
pt = pd.Types [a_idx];
has_unsafe_arg |= pt.IsPointer;
if (p_mod == Parameter.Modifier.PARAMS) {
if (chose_params_expanded) {
params_initializers = new ArrayList (arg_count - a_idx);
pt = TypeManager.GetElementType (pt);
}
}
}
//
// Types have to be identical when ref or out modifer is used
//
if (a.Modifier != 0 || (p_mod & ~Parameter.Modifier.PARAMS) != 0) {
if ((p_mod & ~Parameter.Modifier.PARAMS) != a.Modifier)
break;
if (!TypeManager.IsEqual (a.Expr.Type, pt))
break;
continue;
} else {
NamedArgument na = a as NamedArgument;
if (na != null) {
int name_index = pd.GetParameterIndexByName (na.Name.Value);
if (name_index < 0 || name_index >= param_count) {
if (DeclaringType != null && TypeManager.IsDelegateType (DeclaringType)) {
ec.Report.SymbolRelatedToPreviousError (DeclaringType);
ec.Report.Error (1746, na.Name.Location,
"The delegate `{0}' does not contain a parameter named `{1}'",
TypeManager.CSharpName (DeclaringType), na.Name.Value);
} else {
ec.Report.SymbolRelatedToPreviousError (best_candidate);
ec.Report.Error (1739, na.Name.Location,
"The best overloaded method match for `{0}' does not contain a parameter named `{1}'",
TypeManager.CSharpSignature (method), na.Name.Value);
}
} else if (arguments[name_index] != a) {
if (DeclaringType != null && TypeManager.IsDelegateType (DeclaringType))
ec.Report.SymbolRelatedToPreviousError (DeclaringType);
else
ec.Report.SymbolRelatedToPreviousError (best_candidate);
ec.Report.Error (1744, na.Name.Location,
"Named argument `{0}' cannot be used for a parameter which has positional argument specified",
na.Name.Value);
}
}
}
if (delegate_type != null && !Delegate.IsTypeCovariant (a.Expr, pt))
break;
Expression conv = Convert.ImplicitConversion (ec, a.Expr, pt, loc);
if (conv == null)
break;
//
// Convert params arguments to an array initializer
//
if (params_initializers != null) {
// we choose to use 'a.Expr' rather than 'conv' so that
// we don't hide the kind of expression we have (esp. CompoundAssign.Helper)
params_initializers.Add (a.Expr);
arguments.RemoveAt (a_idx--);
--arg_count;
continue;
}
// Update the argument with the implicit conversion
a.Expr = conv;
}
if (a_idx != arg_count) {
if (!may_fail && ec.Report.Errors == errors) {
if (CustomErrorHandler != null)
CustomErrorHandler.NoExactMatch (ec, best_candidate);
else
Error_InvalidArguments (ec, loc, a_pos, method, a, pd, pt);
}
return false;
}
//
// Fill not provided arguments required by params modifier
//
if (params_initializers == null && pd.HasParams && arg_count + 1 == param_count) {
if (arguments == null)
arguments = new Arguments (1);
pt = pd.Types [param_count - 1];
pt = TypeManager.GetElementType (pt);
has_unsafe_arg |= pt.IsPointer;
params_initializers = new ArrayList (0);
}
//
// Append an array argument with all params arguments
//
if (params_initializers != null) {
arguments.Add (new Argument (
new ArrayCreation (new TypeExpression (pt, loc), "[]",
params_initializers, loc).Resolve (ec)));
arg_count++;
}
if (arg_count < param_count) {
if (!may_fail)
Error_ArgumentCountWrong (ec, arg_count);
return false;
}
if (has_unsafe_arg && !ec.IsUnsafe) {
if (!may_fail)
UnsafeError (ec, loc);
return false;
}
return true;
}
}
public class ConstantExpr : MemberExpr
{
FieldInfo constant;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public ConstantExpr (FieldInfo constant, Location loc)
{
this.constant = constant;
this.loc = loc;
}
public override string Name {
get { throw new NotImplementedException (); }
}
public override bool IsInstance {
get { return !IsStatic; }
}
public override bool IsStatic {
get { return constant.IsStatic; }
}
public override Type DeclaringType {
get { return constant.DeclaringType; }
}
public override MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, Location loc, SimpleName original)
{
constant = TypeManager.GetGenericFieldDefinition (constant);
IConstant ic = TypeManager.GetConstant (constant);
if (ic == null) {
if (constant.IsLiteral) {
ic = new ExternalConstant (constant);
} else {
ic = ExternalConstant.CreateDecimal (constant);
// HACK: decimal field was not resolved as constant
if (ic == null)
return new FieldExpr (constant, loc).ResolveMemberAccess (ec, left, loc, original);
}
TypeManager.RegisterConstant (constant, ic);
}
return base.ResolveMemberAccess (ec, left, loc, original);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
IConstant ic = TypeManager.GetConstant (constant);
if (ic.ResolveValue ()) {
if (!ec.IsObsolete)
ic.CheckObsoleteness (loc);
}
return ic.CreateConstantReference (loc);
}
public override void Emit (EmitContext ec)
{
throw new NotSupportedException ();
}
public override string GetSignatureForError ()
{
return TypeManager.GetFullNameSignature (constant);
}
}
/// <summary>
/// Fully resolved expression that evaluates to a Field
/// </summary>
public class FieldExpr : MemberExpr, IAssignMethod, IMemoryLocation, IVariableReference {
public FieldInfo FieldInfo;
readonly Type constructed_generic_type;
VariableInfo variable_info;
LocalTemporary temp;
bool prepared;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
protected FieldExpr (Location l)
{
loc = l;
}
public FieldExpr (FieldInfo fi, Location l)
{
FieldInfo = fi;
type = TypeManager.TypeToCoreType (fi.FieldType);
loc = l;
}
public FieldExpr (FieldInfo fi, Type genericType, Location l)
: this (fi, l)
{
if (TypeManager.IsGenericTypeDefinition (genericType))
return;
this.constructed_generic_type = genericType;
}
public override string Name {
get {
return FieldInfo.Name;
}
}
public override bool IsInstance {
get {
return !FieldInfo.IsStatic;
}
}
public override bool IsStatic {
get {
return FieldInfo.IsStatic;
}
}
public override Type DeclaringType {
get {
return FieldInfo.DeclaringType;
}
}
public override string GetSignatureForError ()
{
return TypeManager.GetFullNameSignature (FieldInfo);
}
public VariableInfo VariableInfo {
get {
return variable_info;
}
}
public override MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, Location loc,
SimpleName original)
{
FieldInfo fi = TypeManager.GetGenericFieldDefinition (FieldInfo);
Type t = fi.FieldType;
if (t.IsPointer && !ec.IsUnsafe) {
UnsafeError (ec, loc);
}
return base.ResolveMemberAccess (ec, left, loc, original);
}
public void SetHasAddressTaken ()
{
IVariableReference vr = InstanceExpression as IVariableReference;
if (vr != null)
vr.SetHasAddressTaken ();
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Expression instance;
if (InstanceExpression == null) {
instance = new NullLiteral (loc);
} else {
instance = InstanceExpression.CreateExpressionTree (ec);
}
Arguments args = Arguments.CreateForExpressionTree (ec, null,
instance,
CreateTypeOfExpression ());
return CreateExpressionFactoryCall (ec, "Field", args);
}
public Expression CreateTypeOfExpression ()
{
return new TypeOfField (GetConstructedFieldInfo (), loc);
}
override public Expression DoResolve (ResolveContext ec)
{
return DoResolve (ec, false, false);
}
Expression DoResolve (ResolveContext ec, bool lvalue_instance, bool out_access)
{
if (!FieldInfo.IsStatic){
if (InstanceExpression == null){
//
// This can happen when referencing an instance field using
// a fully qualified type expression: TypeName.InstanceField = xxx
//
SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
return null;
}
// Resolve the field's instance expression while flow analysis is turned
// off: when accessing a field "a.b", we must check whether the field
// "a.b" is initialized, not whether the whole struct "a" is initialized.
if (lvalue_instance) {
using (ec.With (ResolveContext.Options.DoFlowAnalysis, false)) {
Expression right_side =
out_access ? EmptyExpression.LValueMemberOutAccess : EmptyExpression.LValueMemberAccess;
if (InstanceExpression != EmptyExpression.Null)
InstanceExpression = InstanceExpression.ResolveLValue (ec, right_side);
}
} else {
ResolveFlags rf = ResolveFlags.VariableOrValue | ResolveFlags.DisableFlowAnalysis;
if (InstanceExpression != EmptyExpression.Null)
InstanceExpression = InstanceExpression.Resolve (ec, rf);
}
if (InstanceExpression == null)
return null;
using (ec.Set (ResolveContext.Options.OmitStructFlowAnalysis)) {
InstanceExpression.CheckMarshalByRefAccess (ec);
}
}
// TODO: the code above uses some non-standard multi-resolve rules
if (eclass != ExprClass.Invalid)
return this;
if (!ec.IsObsolete) {
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null) {
f.CheckObsoleteness (loc);
} else {
ObsoleteAttribute oa = AttributeTester.GetMemberObsoleteAttribute (FieldInfo);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, TypeManager.GetFullNameSignature (FieldInfo), loc, ec.Report);
}
}
IFixedBuffer fb = AttributeTester.GetFixedBuffer (FieldInfo);
IVariableReference var = InstanceExpression as IVariableReference;
if (fb != null) {
IFixedExpression fe = InstanceExpression as IFixedExpression;
if (!ec.HasSet (ResolveContext.Options.FixedInitializerScope) && (fe == null || !fe.IsFixed)) {
ec.Report.Error (1666, loc, "You cannot use fixed size buffers contained in unfixed expressions. Try using the fixed statement");
}
if (InstanceExpression.eclass != ExprClass.Variable) {
ec.Report.SymbolRelatedToPreviousError (FieldInfo);
ec.Report.Error (1708, loc, "`{0}': Fixed size buffers can only be accessed through locals or fields",
TypeManager.GetFullNameSignature (FieldInfo));
} else if (var != null && var.IsHoisted) {
AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, var, loc);
}
return new FixedBufferPtr (this, fb.ElementType, loc).Resolve (ec);
}
eclass = ExprClass.Variable;
// If the instance expression is a local variable or parameter.
if (var == null || var.VariableInfo == null)
return this;
VariableInfo vi = var.VariableInfo;
if (!vi.IsFieldAssigned (ec, FieldInfo.Name, loc))
return null;
variable_info = vi.GetSubStruct (FieldInfo.Name);
eclass = ExprClass.Variable;
return this;
}
static readonly int [] codes = {
191, // instance, write access
192, // instance, out access
198, // static, write access
199, // static, out access
1648, // member of value instance, write access
1649, // member of value instance, out access
1650, // member of value static, write access
1651 // member of value static, out access
};
static readonly string [] msgs = {
/*0191*/ "A readonly field `{0}' cannot be assigned to (except in a constructor or a variable initializer)",
/*0192*/ "A readonly field `{0}' cannot be passed ref or out (except in a constructor)",
/*0198*/ "A static readonly field `{0}' cannot be assigned to (except in a static constructor or a variable initializer)",
/*0199*/ "A static readonly field `{0}' cannot be passed ref or out (except in a static constructor)",
/*1648*/ "Members of readonly field `{0}' cannot be modified (except in a constructor or a variable initializer)",
/*1649*/ "Members of readonly field `{0}' cannot be passed ref or out (except in a constructor)",
/*1650*/ "Fields of static readonly field `{0}' cannot be assigned to (except in a static constructor or a variable initializer)",
/*1651*/ "Fields of static readonly field `{0}' cannot be passed ref or out (except in a static constructor)"
};
// The return value is always null. Returning a value simplifies calling code.
Expression Report_AssignToReadonly (ResolveContext ec, Expression right_side)
{
int i = 0;
if (right_side == EmptyExpression.OutAccess || right_side == EmptyExpression.LValueMemberOutAccess)
i += 1;
if (IsStatic)
i += 2;
if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess)
i += 4;
ec.Report.Error (codes [i], loc, msgs [i], GetSignatureForError ());
return null;
}
override public Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
IVariableReference var = InstanceExpression as IVariableReference;
if (var != null && var.VariableInfo != null)
var.VariableInfo.SetFieldAssigned (ec, FieldInfo.Name);
bool lvalue_instance = !FieldInfo.IsStatic && TypeManager.IsValueType (FieldInfo.DeclaringType);
bool out_access = right_side == EmptyExpression.OutAccess || right_side == EmptyExpression.LValueMemberOutAccess;
Expression e = DoResolve (ec, lvalue_instance, out_access);
if (e == null)
return null;
FieldBase fb = TypeManager.GetField (FieldInfo);
if (fb != null) {
fb.SetAssigned ();
if ((right_side == EmptyExpression.UnaryAddress || right_side == EmptyExpression.OutAccess) &&
(fb.ModFlags & Modifiers.VOLATILE) != 0) {
ec.Report.Warning (420, 1, loc,
"`{0}': A volatile field references will not be treated as volatile",
fb.GetSignatureForError ());
}
}
if (FieldInfo.IsInitOnly) {
// InitOnly fields can only be assigned in constructors or initializers
if (!ec.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.ConstructorScope))
return Report_AssignToReadonly (ec, right_side);
if (ec.HasSet (ResolveContext.Options.ConstructorScope)) {
Type ctype = ec.CurrentType;
// InitOnly fields cannot be assigned-to in a different constructor from their declaring type
if (!TypeManager.IsEqual (ctype, FieldInfo.DeclaringType))
return Report_AssignToReadonly (ec, right_side);
// static InitOnly fields cannot be assigned-to in an instance constructor
if (IsStatic && !ec.IsStatic)
return Report_AssignToReadonly (ec, right_side);
// instance constructors can't modify InitOnly fields of other instances of the same type
if (!IsStatic && !(InstanceExpression is This))
return Report_AssignToReadonly (ec, right_side);
}
}
if (right_side == EmptyExpression.OutAccess &&
!IsStatic && !(InstanceExpression is This) && TypeManager.mbr_type != null && TypeManager.IsSubclassOf (DeclaringType, TypeManager.mbr_type)) {
ec.Report.SymbolRelatedToPreviousError (DeclaringType);
ec.Report.Warning (197, 1, loc,
"Passing `{0}' as ref or out or taking its address may cause a runtime exception because it is a field of a marshal-by-reference class",
GetSignatureForError ());
}
eclass = ExprClass.Variable;
return this;
}
bool is_marshal_by_ref ()
{
return !IsStatic && TypeManager.IsStruct (Type) && TypeManager.mbr_type != null && TypeManager.IsSubclassOf (DeclaringType, TypeManager.mbr_type);
}
public override void CheckMarshalByRefAccess (ResolveContext ec)
{
if (is_marshal_by_ref () && !(InstanceExpression is This)) {
ec.Report.SymbolRelatedToPreviousError (DeclaringType);
ec.Report.Warning (1690, 1, loc, "Cannot call methods, properties, or indexers on `{0}' because it is a value type member of a marshal-by-reference class",
GetSignatureForError ());
}
}
public override int GetHashCode ()
{
return FieldInfo.GetHashCode ();
}
public bool IsFixed {
get {
//
// A variable of the form V.I is fixed when V is a fixed variable of a struct type
//
IVariableReference variable = InstanceExpression as IVariableReference;
if (variable != null)
return TypeManager.IsStruct (InstanceExpression.Type) && variable.IsFixed;
IFixedExpression fe = InstanceExpression as IFixedExpression;
return fe != null && fe.IsFixed;
}
}
public bool IsHoisted {
get {
IVariableReference hv = InstanceExpression as IVariableReference;
return hv != null && hv.IsHoisted;
}
}
public override bool Equals (object obj)
{
FieldExpr fe = obj as FieldExpr;
if (fe == null)
return false;
if (FieldInfo != fe.FieldInfo)
return false;
if (InstanceExpression == null || fe.InstanceExpression == null)
return true;
return InstanceExpression.Equals (fe.InstanceExpression);
}
public void Emit (EmitContext ec, bool leave_copy)
{
ILGenerator ig = ec.ig;
bool is_volatile = false;
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null){
if ((f.ModFlags & Modifiers.VOLATILE) != 0)
is_volatile = true;
f.SetMemberIsUsed ();
}
if (FieldInfo.IsStatic){
if (is_volatile)
ig.Emit (OpCodes.Volatile);
ig.Emit (OpCodes.Ldsfld, GetConstructedFieldInfo ());
} else {
if (!prepared)
EmitInstance (ec, false);
// Optimization for build-in types
if (TypeManager.IsStruct (type) && TypeManager.IsEqual (type, ec.MemberContext.CurrentType)) {
LoadFromPtr (ig, type);
} else {
IFixedBuffer ff = AttributeTester.GetFixedBuffer (FieldInfo);
if (ff != null) {
ig.Emit (OpCodes.Ldflda, GetConstructedFieldInfo ());
ig.Emit (OpCodes.Ldflda, ff.Element);
} else {
if (is_volatile)
ig.Emit (OpCodes.Volatile);
ig.Emit (OpCodes.Ldfld, GetConstructedFieldInfo ());
}
}
}
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (!FieldInfo.IsStatic) {
temp = new LocalTemporary (this.Type);
temp.Store (ec);
}
}
}
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
{
FieldAttributes fa = FieldInfo.Attributes;
bool is_static = (fa & FieldAttributes.Static) != 0;
ILGenerator ig = ec.ig;
prepared = prepare_for_load;
EmitInstance (ec, prepared);
source.Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (!FieldInfo.IsStatic) {
temp = new LocalTemporary (this.Type);
temp.Store (ec);
}
}
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null){
if ((f.ModFlags & Modifiers.VOLATILE) != 0)
ig.Emit (OpCodes.Volatile);
f.SetAssigned ();
}
if (is_static)
ig.Emit (OpCodes.Stsfld, GetConstructedFieldInfo ());
else
ig.Emit (OpCodes.Stfld, GetConstructedFieldInfo ());
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
temp = null;
}
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
public override void EmitSideEffect (EmitContext ec)
{
FieldBase f = TypeManager.GetField (FieldInfo);
bool is_volatile = f != null && (f.ModFlags & Modifiers.VOLATILE) != 0;
if (is_volatile || is_marshal_by_ref ())
base.EmitSideEffect (ec);
}
public override void Error_VariableIsUsedBeforeItIsDeclared (Report r, string name)
{
r.Error (844, loc,
"A local variable `{0}' cannot be used before it is declared. Consider renaming the local variable when it hides the field `{1}'",
name, GetSignatureForError ());
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
ILGenerator ig = ec.ig;
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null){
if ((mode & AddressOp.Store) != 0)
f.SetAssigned ();
if ((mode & AddressOp.Load) != 0)
f.SetMemberIsUsed ();
}
//
// Handle initonly fields specially: make a copy and then
// get the address of the copy.
//
bool need_copy;
if (FieldInfo.IsInitOnly){
need_copy = true;
if (ec.HasSet (EmitContext.Options.ConstructorScope)){
if (FieldInfo.IsStatic){
if (ec.IsStatic)
need_copy = false;
} else
need_copy = false;
}
} else
need_copy = false;
if (need_copy){
LocalBuilder local;
Emit (ec);
local = ig.DeclareLocal (type);
ig.Emit (OpCodes.Stloc, local);
ig.Emit (OpCodes.Ldloca, local);
return;
}
if (FieldInfo.IsStatic){
ig.Emit (OpCodes.Ldsflda, GetConstructedFieldInfo ());
} else {
if (!prepared)
EmitInstance (ec, false);
ig.Emit (OpCodes.Ldflda, GetConstructedFieldInfo ());
}
}
FieldInfo GetConstructedFieldInfo ()
{
if (constructed_generic_type == null)
return FieldInfo;
#if GMCS_SOURCE
return TypeBuilder.GetField (constructed_generic_type, FieldInfo);
#else
throw new NotSupportedException ();
#endif
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
FieldInfo = storey.MutateField (FieldInfo);
base.MutateHoistedGenericType (storey);
}
}
/// <summary>
/// Expression that evaluates to a Property. The Assign class
/// might set the `Value' expression if we are in an assignment.
///
/// This is not an LValue because we need to re-write the expression, we
/// can not take data from the stack and store it.
/// </summary>
public class PropertyExpr : MemberExpr, IAssignMethod {
public readonly PropertyInfo PropertyInfo;
MethodInfo getter, setter;
bool is_static;
bool resolved;
LocalTemporary temp;
bool prepared;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public PropertyExpr (Type container_type, PropertyInfo pi, Location l)
{
PropertyInfo = pi;
eclass = ExprClass.PropertyAccess;
is_static = false;
loc = l;
type = TypeManager.TypeToCoreType (pi.PropertyType);
ResolveAccessors (container_type);
}
public override string Name {
get {
return PropertyInfo.Name;
}
}
public override bool IsInstance {
get {
return !is_static;
}
}
public override bool IsStatic {
get {
return is_static;
}
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args;
if (IsSingleDimensionalArrayLength ()) {
args = new Arguments (1);
args.Add (new Argument (InstanceExpression.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall (ec, "ArrayLength", args);
}
if (is_base) {
Error_BaseAccessInExpressionTree (ec, loc);
return null;
}
args = new Arguments (2);
if (InstanceExpression == null)
args.Add (new Argument (new NullLiteral (loc)));
else
args.Add (new Argument (InstanceExpression.CreateExpressionTree (ec)));
args.Add (new Argument (new TypeOfMethod (getter, loc)));
return CreateExpressionFactoryCall (ec, "Property", args);
}
public Expression CreateSetterTypeOfExpression ()
{
return new TypeOfMethod (setter, loc);
}
public override Type DeclaringType {
get {
return PropertyInfo.DeclaringType;
}
}
public override string GetSignatureForError ()
{
return TypeManager.GetFullNameSignature (PropertyInfo);
}
void FindAccessors (Type invocation_type)
{
const BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic |
BindingFlags.Static | BindingFlags.Instance |
BindingFlags.DeclaredOnly;
Type current = PropertyInfo.DeclaringType;
for (; current != null; current = current.BaseType) {
MemberInfo[] group = TypeManager.MemberLookup (
invocation_type, invocation_type, current,
MemberTypes.Property, flags, PropertyInfo.Name, null);
if (group == null)
continue;
if (group.Length != 1)
// Oooops, can this ever happen ?
return;
PropertyInfo pi = (PropertyInfo) group [0];
if (getter == null)
getter = pi.GetGetMethod (true);
if (setter == null)
setter = pi.GetSetMethod (true);
MethodInfo accessor = getter != null ? getter : setter;
if (!accessor.IsVirtual)
return;
}
}
//
// We also perform the permission checking here, as the PropertyInfo does not
// hold the information for the accessibility of its setter/getter
//
// TODO: Refactor to use some kind of cache together with GetPropertyFromAccessor
void ResolveAccessors (Type container_type)
{
FindAccessors (container_type);
if (getter != null) {
MethodBase the_getter = TypeManager.DropGenericMethodArguments (getter);
IMethodData md = TypeManager.GetMethod (the_getter);
if (md != null)
md.SetMemberIsUsed ();
is_static = getter.IsStatic;
}
if (setter != null) {
MethodBase the_setter = TypeManager.DropGenericMethodArguments (setter);
IMethodData md = TypeManager.GetMethod (the_setter);
if (md != null)
md.SetMemberIsUsed ();
is_static = setter.IsStatic;
}
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
if (InstanceExpression != null)
InstanceExpression.MutateHoistedGenericType (storey);
type = storey.MutateType (type);
if (getter != null)
getter = storey.MutateGenericMethod (getter);
if (setter != null)
setter = storey.MutateGenericMethod (setter);
}
bool InstanceResolve (ResolveContext ec, bool lvalue_instance, bool must_do_cs1540_check)
{
if (is_static) {
InstanceExpression = null;
return true;
}
if (InstanceExpression == null) {
SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
return false;
}
InstanceExpression = InstanceExpression.DoResolve (ec);
if (lvalue_instance && InstanceExpression != null)
InstanceExpression = InstanceExpression.ResolveLValue (ec, EmptyExpression.LValueMemberAccess);
if (InstanceExpression == null)
return false;
InstanceExpression.CheckMarshalByRefAccess (ec);
if (must_do_cs1540_check && (InstanceExpression != EmptyExpression.Null) &&
!TypeManager.IsInstantiationOfSameGenericType (InstanceExpression.Type, ec.CurrentType) &&
!TypeManager.IsNestedChildOf (ec.CurrentType, InstanceExpression.Type) &&
!TypeManager.IsSubclassOf (InstanceExpression.Type, ec.CurrentType)) {
ec.Report.SymbolRelatedToPreviousError (PropertyInfo);
Error_CannotAccessProtected (ec, loc, PropertyInfo, InstanceExpression.Type, ec.CurrentType);
return false;
}
return true;
}
void Error_PropertyNotFound (ResolveContext ec, MethodInfo mi, bool getter)
{
// TODO: correctly we should compare arguments but it will lead to bigger changes
if (mi is MethodBuilder) {
Error_TypeDoesNotContainDefinition (ec, loc, PropertyInfo.DeclaringType, Name);
return;
}
StringBuilder sig = new StringBuilder (TypeManager.CSharpName (mi.DeclaringType));
sig.Append ('.');
AParametersCollection iparams = TypeManager.GetParameterData (mi);
sig.Append (getter ? "get_" : "set_");
sig.Append (Name);
sig.Append (iparams.GetSignatureForError ());
ec.Report.SymbolRelatedToPreviousError (mi);
ec.Report.Error (1546, loc, "Property `{0}' is not supported by the C# language. Try to call the accessor method `{1}' directly",
Name, sig.ToString ());
}
public bool IsAccessibleFrom (Type invocation_type, bool lvalue)
{
bool dummy;
MethodInfo accessor = lvalue ? setter : getter;
if (accessor == null && lvalue)
accessor = getter;
return accessor != null && IsAccessorAccessible (invocation_type, accessor, out dummy);
}
bool IsSingleDimensionalArrayLength ()
{
if (DeclaringType != TypeManager.array_type || getter == null || Name != "Length")
return false;
string t_name = InstanceExpression.Type.Name;
int t_name_len = t_name.Length;
return t_name_len > 2 && t_name [t_name_len - 2] == '[';
}
override public Expression DoResolve (ResolveContext ec)
{
if (resolved)
return this;
if (getter != null){
if (TypeManager.GetParameterData (getter).Count != 0){
Error_PropertyNotFound (ec, getter, true);
return null;
}
}
if (getter == null){
//
// The following condition happens if the PropertyExpr was
// created, but is invalid (ie, the property is inaccessible),
// and we did not want to embed the knowledge about this in
// the caller routine. This only avoids double error reporting.
//
if (setter == null)
return null;
if (InstanceExpression != EmptyExpression.Null) {
ec.Report.Error (154, loc, "The property or indexer `{0}' cannot be used in this context because it lacks the `get' accessor",
TypeManager.GetFullNameSignature (PropertyInfo));
return null;
}
}
bool must_do_cs1540_check = false;
if (getter != null &&
!IsAccessorAccessible (ec.CurrentType, getter, out must_do_cs1540_check)) {
PropertyBase.PropertyMethod pm = TypeManager.GetMethod (getter) as PropertyBase.PropertyMethod;
if (pm != null && pm.HasCustomAccessModifier) {
ec.Report.SymbolRelatedToPreviousError (pm);
ec.Report.Error (271, loc, "The property or indexer `{0}' cannot be used in this context because the get accessor is inaccessible",
TypeManager.CSharpSignature (getter));
}
else {
ec.Report.SymbolRelatedToPreviousError (getter);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (getter), ec.Report);
}
return null;
}
if (!InstanceResolve (ec, false, must_do_cs1540_check))
return null;
//
// Only base will allow this invocation to happen.
//
if (IsBase && getter.IsAbstract) {
Error_CannotCallAbstractBase (ec, TypeManager.GetFullNameSignature (PropertyInfo));
}
if (PropertyInfo.PropertyType.IsPointer && !ec.IsUnsafe){
UnsafeError (ec, loc);
}
if (!ec.IsObsolete) {
PropertyBase pb = TypeManager.GetProperty (PropertyInfo);
if (pb != null) {
pb.CheckObsoleteness (loc);
} else {
ObsoleteAttribute oa = AttributeTester.GetMemberObsoleteAttribute (PropertyInfo);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, ec.Report);
}
}
resolved = true;
return this;
}
override public Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
if (right_side == EmptyExpression.OutAccess) {
if (ec.CurrentBlock.Toplevel.GetParameterReference (PropertyInfo.Name, loc) is MemberAccess) {
ec.Report.Error (1939, loc, "A range variable `{0}' may not be passes as `ref' or `out' parameter",
PropertyInfo.Name);
} else {
ec.Report.Error (206, loc, "A property or indexer `{0}' may not be passed as `ref' or `out' parameter",
GetSignatureForError ());
}
return null;
}
if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess) {
Error_CannotModifyIntermediateExpressionValue (ec);
}
if (setter == null){
//
// The following condition happens if the PropertyExpr was
// created, but is invalid (ie, the property is inaccessible),
// and we did not want to embed the knowledge about this in
// the caller routine. This only avoids double error reporting.
//
if (getter == null)
return null;
if (ec.CurrentBlock.Toplevel.GetParameterReference (PropertyInfo.Name, loc) is MemberAccess) {
ec.Report.Error (1947, loc, "A range variable `{0}' cannot be assigned to. Consider using `let' clause to store the value",
PropertyInfo.Name);
} else {
ec.Report.Error (200, loc, "Property or indexer `{0}' cannot be assigned to (it is read only)",
GetSignatureForError ());
}
return null;
}
if (TypeManager.GetParameterData (setter).Count != 1){
Error_PropertyNotFound (ec, setter, false);
return null;
}
bool must_do_cs1540_check;
if (!IsAccessorAccessible (ec.CurrentType, setter, out must_do_cs1540_check)) {
PropertyBase.PropertyMethod pm = TypeManager.GetMethod (setter) as PropertyBase.PropertyMethod;
if (pm != null && pm.HasCustomAccessModifier) {
ec.Report.SymbolRelatedToPreviousError (pm);
ec.Report.Error (272, loc, "The property or indexer `{0}' cannot be used in this context because the set accessor is inaccessible",
TypeManager.CSharpSignature (setter));
}
else {
ec.Report.SymbolRelatedToPreviousError (setter);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (setter), ec.Report);
}
return null;
}
if (!InstanceResolve (ec, TypeManager.IsStruct (PropertyInfo.DeclaringType), must_do_cs1540_check))
return null;
//
// Only base will allow this invocation to happen.
//
if (IsBase && setter.IsAbstract){
Error_CannotCallAbstractBase (ec, TypeManager.GetFullNameSignature (PropertyInfo));
}
if (PropertyInfo.PropertyType.IsPointer && !ec.IsUnsafe) {
UnsafeError (ec, loc);
}
if (!ec.IsObsolete) {
PropertyBase pb = TypeManager.GetProperty (PropertyInfo);
if (pb != null) {
pb.CheckObsoleteness (loc);
} else {
ObsoleteAttribute oa = AttributeTester.GetMemberObsoleteAttribute (PropertyInfo);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, ec.Report);
}
}
return this;
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
public void Emit (EmitContext ec, bool leave_copy)
{
//
// Special case: length of single dimension array property is turned into ldlen
//
if (IsSingleDimensionalArrayLength ()) {
if (!prepared)
EmitInstance (ec, false);
ec.ig.Emit (OpCodes.Ldlen);
ec.ig.Emit (OpCodes.Conv_I4);
return;
}
Invocation.EmitCall (ec, IsBase, InstanceExpression, getter, null, loc, prepared, false);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (!is_static) {
temp = new LocalTemporary (this.Type);
temp.Store (ec);
}
}
}
//
// Implements the IAssignMethod interface for assignments
//
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
{
Expression my_source = source;
if (prepare_for_load) {
prepared = true;
source.Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (!is_static) {
temp = new LocalTemporary (this.Type);
temp.Store (ec);
}
}
} else if (leave_copy) {
source.Emit (ec);
temp = new LocalTemporary (this.Type);
temp.Store (ec);
my_source = temp;
}
Arguments args = new Arguments (1);
args.Add (new Argument (my_source));
Invocation.EmitCall (ec, IsBase, InstanceExpression, setter, args, loc, false, prepared);
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
}
}
}
/// <summary>
/// Fully resolved expression that evaluates to an Event
/// </summary>
public class EventExpr : MemberExpr {
public readonly EventInfo EventInfo;
bool is_static;
MethodInfo add_accessor, remove_accessor;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public EventExpr (EventInfo ei, Location loc)
{
EventInfo = ei;
this.loc = loc;
eclass = ExprClass.EventAccess;
add_accessor = TypeManager.GetAddMethod (ei);
remove_accessor = TypeManager.GetRemoveMethod (ei);
if (add_accessor.IsStatic || remove_accessor.IsStatic)
is_static = true;
if (EventInfo is MyEventBuilder){
MyEventBuilder eb = (MyEventBuilder) EventInfo;
type = eb.EventType;
eb.SetUsed ();
} else
type = EventInfo.EventHandlerType;
}
public override string Name {
get {
return EventInfo.Name;
}
}
public override bool IsInstance {
get {
return !is_static;
}
}
public override bool IsStatic {
get {
return is_static;
}
}
public override Type DeclaringType {
get {
return EventInfo.DeclaringType;
}
}
public void Error_AssignmentEventOnly (ResolveContext ec)
{
ec.Report.Error (79, loc, "The event `{0}' can only appear on the left hand side of `+=' or `-=' operator",
GetSignatureForError ());
}
public override MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, Location loc,
SimpleName original)
{
//
// If the event is local to this class, we transform ourselves into a FieldExpr
//
if (EventInfo.DeclaringType == ec.CurrentType ||
TypeManager.IsNestedChildOf(ec.CurrentType, EventInfo.DeclaringType)) {
EventField mi = TypeManager.GetEventField (EventInfo);
if (mi != null) {
if (!ec.IsObsolete)
mi.CheckObsoleteness (loc);
if ((mi.ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) != 0 && !ec.HasSet (ResolveContext.Options.CompoundAssignmentScope))
Error_AssignmentEventOnly (ec);
FieldExpr ml = new FieldExpr (mi.BackingField.FieldBuilder, loc);
InstanceExpression = null;
return ml.ResolveMemberAccess (ec, left, loc, original);
}
}
if (left is This && !ec.HasSet (ResolveContext.Options.CompoundAssignmentScope))
Error_AssignmentEventOnly (ec);
return base.ResolveMemberAccess (ec, left, loc, original);
}
bool InstanceResolve (ResolveContext ec, bool must_do_cs1540_check)
{
if (is_static) {
InstanceExpression = null;
return true;
}
if (InstanceExpression == null) {
SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
return false;
}
InstanceExpression = InstanceExpression.DoResolve (ec);
if (InstanceExpression == null)
return false;
if (IsBase && add_accessor.IsAbstract) {
Error_CannotCallAbstractBase (ec, TypeManager.CSharpSignature(add_accessor));
return false;
}
//
// This is using the same mechanism as the CS1540 check in PropertyExpr.
// However, in the Event case, we reported a CS0122 instead.
//
// TODO: Exact copy from PropertyExpr
//
if (must_do_cs1540_check && InstanceExpression != EmptyExpression.Null &&
!TypeManager.IsInstantiationOfSameGenericType (InstanceExpression.Type, ec.CurrentType) &&
!TypeManager.IsNestedChildOf (ec.CurrentType, InstanceExpression.Type) &&
!TypeManager.IsSubclassOf (InstanceExpression.Type, ec.CurrentType)) {
ec.Report.SymbolRelatedToPreviousError (EventInfo);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (EventInfo), ec.Report);
return false;
}
return true;
}
public bool IsAccessibleFrom (Type invocation_type)
{
bool dummy;
return IsAccessorAccessible (invocation_type, add_accessor, out dummy) &&
IsAccessorAccessible (invocation_type, remove_accessor, out dummy);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
// contexts where an LValue is valid have already devolved to FieldExprs
Error_CannotAssign (ec);
return null;
}
public override Expression DoResolve (ResolveContext ec)
{
bool must_do_cs1540_check;
if (!(IsAccessorAccessible (ec.CurrentType, add_accessor, out must_do_cs1540_check) &&
IsAccessorAccessible (ec.CurrentType, remove_accessor, out must_do_cs1540_check))) {
ec.Report.SymbolRelatedToPreviousError (EventInfo);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (EventInfo), ec.Report);
return null;
}
if (!InstanceResolve (ec, must_do_cs1540_check))
return null;
if (!ec.HasSet (ResolveContext.Options.CompoundAssignmentScope)) {
Error_CannotAssign (ec);
return null;
}
if (!ec.IsObsolete) {
EventField ev = TypeManager.GetEventField (EventInfo);
if (ev != null) {
ev.CheckObsoleteness (loc);
} else {
ObsoleteAttribute oa = AttributeTester.GetMemberObsoleteAttribute (EventInfo);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, ec.Report);
}
}
return this;
}
public override void Emit (EmitContext ec)
{
throw new NotSupportedException ();
//Error_CannotAssign ();
}
public void Error_CannotAssign (ResolveContext ec)
{
ec.Report.Error (70, loc,
"The event `{0}' can only appear on the left hand side of += or -= when used outside of the type `{1}'",
GetSignatureForError (), TypeManager.CSharpName (EventInfo.DeclaringType));
}
public override string GetSignatureForError ()
{
return TypeManager.CSharpSignature (EventInfo);
}
public void EmitAddOrRemove (EmitContext ec, bool is_add, Expression source)
{
Arguments args = new Arguments (1);
args.Add (new Argument (source));
Invocation.EmitCall (ec, IsBase, InstanceExpression, is_add ? add_accessor : remove_accessor, args, loc);
}
}
public class TemporaryVariable : VariableReference
{
LocalInfo li;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public TemporaryVariable (Type type, Location loc)
{
this.type = type;
this.loc = loc;
eclass = ExprClass.Variable;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
if (li != null)
return this;
TypeExpr te = new TypeExpression (type, loc);
li = ec.CurrentBlock.AddTemporaryVariable (te, loc);
if (!li.Resolve (ec))
return null;
//
// Don't capture temporary variables except when using
// iterator redirection
//
if (ec.CurrentAnonymousMethod != null && ec.CurrentAnonymousMethod.IsIterator && ec.IsVariableCapturingRequired) {
AnonymousMethodStorey storey = li.Block.Explicit.CreateAnonymousMethodStorey (ec);
storey.CaptureLocalVariable (ec, li);
}
return this;
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
return DoResolve (ec);
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
public void EmitAssign (EmitContext ec, Expression source)
{
EmitAssign (ec, source, false, false);
}
public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
{
return li.HoistedVariableReference;
}
public override bool IsFixed {
get { return true; }
}
public override bool IsRef {
get { return false; }
}
public override string Name {
get { throw new NotImplementedException (); }
}
public override void SetHasAddressTaken ()
{
throw new NotImplementedException ();
}
protected override ILocalVariable Variable {
get { return li; }
}
public override VariableInfo VariableInfo {
get { throw new NotImplementedException (); }
}
}
///
/// Handles `var' contextual keyword; var becomes a keyword only
/// if no type called var exists in a variable scope
///
class VarExpr : SimpleName
{
// Used for error reporting only
ArrayList initializer;
public VarExpr (Location loc)
: base ("var", loc)
{
}
public ArrayList VariableInitializer {
set {
this.initializer = value;
}
}
public bool InferType (ResolveContext ec, Expression right_side)
{
if (type != null)
throw new InternalErrorException ("An implicitly typed local variable could not be redefined");
type = right_side.Type;
if (type == TypeManager.null_type || type == TypeManager.void_type || type == InternalType.AnonymousMethod || type == InternalType.MethodGroup) {
ec.Report.Error (815, loc, "An implicitly typed local variable declaration cannot be initialized with `{0}'",
right_side.GetSignatureForError ());
return false;
}
eclass = ExprClass.Variable;
return true;
}
protected override void Error_TypeOrNamespaceNotFound (IMemberContext ec)
{
if (RootContext.Version < LanguageVersion.V_3)
base.Error_TypeOrNamespaceNotFound (ec);
else
ec.Compiler.Report.Error (825, loc, "The contextual keyword `var' may only appear within a local variable declaration");
}
public override TypeExpr ResolveAsContextualType (IMemberContext rc, bool silent)
{
TypeExpr te = base.ResolveAsContextualType (rc, true);
if (te != null)
return te;
if (RootContext.Version < LanguageVersion.V_3)
rc.Compiler.Report.FeatureIsNotAvailable (loc, "implicitly typed local variable");
if (initializer == null)
return null;
if (initializer.Count > 1) {
Location loc_init = ((CSharpParser.VariableDeclaration) initializer[1]).Location;
rc.Compiler.Report.Error (819, loc_init, "An implicitly typed local variable declaration cannot include multiple declarators");
initializer = null;
return null;
}
Expression variable_initializer = ((CSharpParser.VariableDeclaration) initializer[0]).expression_or_array_initializer;
if (variable_initializer == null) {
rc.Compiler.Report.Error (818, loc, "An implicitly typed local variable declarator must include an initializer");
return null;
}
return null;
}
}
}
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