//
// ecore.cs: Core of the Expression representation for the intermediate tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// (C) 2001, 2002, 2003 Ximian, Inc.
//
//
namespace Mono.CSharp {
using System;
using System.Collections;
using System.Diagnostics;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
///
/// 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).
///
public enum ExprClass : byte {
Invalid,
Value,
Variable,
Namespace,
Type,
MethodGroup,
PropertyAccess,
EventAccess,
IndexerAccess,
Nothing,
}
///
/// This is used to tell Resolve in which types of expressions we're
/// interested.
///
[Flags]
public enum ResolveFlags {
// Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
VariableOrValue = 1,
// Returns a type expression.
Type = 2,
// Returns a method group.
MethodGroup = 4,
// Mask of all the expression class flags.
MaskExprClass = 7,
// Disable control flow analysis while resolving the expression.
// This is used when resolving the instance expression of a field expression.
DisableFlowAnalysis = 8,
// Set if this is resolving the first part of a MemberAccess.
Intermediate = 16,
// Disable control flow analysis _of struct_ while resolving the expression.
// This is used when resolving the instance expression of a field expression.
DisableStructFlowAnalysis = 32,
}
//
// 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
};
///
/// This interface is implemented by variables
///
public interface IMemoryLocation {
///
/// 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.
///
void AddressOf (EmitContext ec, AddressOp mode);
}
///
/// This interface is implemented by variables
///
public interface IVariable {
VariableInfo VariableInfo {
get;
}
bool VerifyFixed ();
}
///
/// Base class for expressions
///
public abstract class Expression {
public ExprClass eclass;
protected Type type;
protected Location loc;
public Type Type {
get { return type; }
set { type = value; }
}
public virtual Location Location {
get { return loc; }
}
///
/// Utility wrapper routine for Error, just to beautify the code
///
public void Error (int error, string s)
{
Report.Error (error, loc, s);
}
// Not nice but we have broken hierarchy.
public virtual void CheckMarshalByRefAccess ()
{
}
public virtual bool GetAttributableValue (Type valueType, out object value)
{
Attribute.Error_AttributeArgumentNotValid (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 (mi.DeclaringType.Assembly == invocation_type.Assembly ||
TypeManager.IsFriendAssembly (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;
}
///
/// Performs semantic analysis on the Expression
///
///
///
/// 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).
///
public abstract Expression DoResolve (EmitContext ec);
public virtual Expression DoResolveLValue (EmitContext 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 (IResolveContext ec, bool silent)
{
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 (IResolveContext 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 (IResolveContext 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.IsInObsoleteScope) {
AttributeTester.Report_ObsoleteMessage (obsolete_attr, te.GetSignatureForError (), Location);
}
}
// Constrains don't need to be checked for overrides
GenericMethod gm = ec.GenericDeclContainer as GenericMethod;
if (gm != null && (gm.ModFlags & Modifiers.OVERRIDE) != 0) {
te.loc = loc;
return te;
}
ConstructedType ct = te as ConstructedType;
if ((ct != null) && !ct.CheckConstraints (ec))
return null;
return te;
}
public TypeExpr ResolveAsBaseTerminal (IResolveContext ec, bool silent)
{
int errors = Report.Errors;
FullNamedExpression fne = ResolveAsTypeStep (ec, silent);
if (fne == null)
return null;
if (fne.eclass != ExprClass.Type) {
if (!silent && errors == Report.Errors)
fne.Error_UnexpectedKind (null, "type", loc);
return null;
}
TypeExpr te = fne as TypeExpr;
if (!te.CheckAccessLevel (ec.DeclContainer)) {
Report.SymbolRelatedToPreviousError (te.Type);
ErrorIsInaccesible (loc, TypeManager.CSharpName (te.Type));
return null;
}
te.loc = loc;
return te;
}
public static void ErrorIsInaccesible (Location loc, string name)
{
Report.Error (122, loc, "`{0}' is inaccessible due to its protection level", name);
}
protected static void Error_CannotAccessProtected (Location loc, MemberInfo m, Type qualifier, Type container)
{
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 (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 ()
{
Error_InvalidExpressionStatement (loc);
}
protected void Error_CannotAssign (string to, string roContext)
{
Report.Error (1656, loc, "Cannot assign to `{0}' because it is a `{1}'",
to, roContext);
}
public static void Error_VoidInvalidInTheContext (Location loc)
{
Report.Error (1547, loc, "Keyword `void' cannot be used in this context");
}
public virtual void Error_ValueCannotBeConverted (EmitContext ec, Location loc, Type target, bool expl)
{
if (Type.FullName == target.FullName){
Report.ExtraInformation (loc,
String.Format (
"The type {0} has two conflicting definitions, one comes from {1} and the other from {2}",
Type.FullName, Type.Assembly.FullName, target.Assembly.FullName));
}
if (expl) {
Report.Error (30, loc, "Cannot convert type `{0}' to `{1}'",
GetSignatureForError (), TypeManager.CSharpName (target));
return;
}
Expression e = (this is EnumConstant) ? ((EnumConstant)this).Child : this;
bool b = Convert.ExplicitNumericConversion (e, target) != null;
if (b ||
Convert.ExplicitReferenceConversionExists (Type, target) ||
Convert.ExplicitUnsafe (e, target) != null ||
(ec != null && Convert.UserDefinedConversion (ec, this, target, Location.Null, true) != null))
{
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;
}
if (Type != TypeManager.string_type && this is Constant && !(this is EmptyConstantCast)) {
Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
((Constant)(this)).GetValue ().ToString (), TypeManager.CSharpName (target));
return;
}
Report.Error (29, loc, "Cannot implicitly convert type {0} to `{1}'",
Type == TypeManager.anonymous_method_type ?
"anonymous method" : "`" + GetSignatureForError () + "'",
TypeManager.CSharpName (target));
}
protected void Error_VariableIsUsedBeforeItIsDeclared (string name)
{
Report.Error (841, loc, "The variable `{0}' cannot be used before it is declared",
name);
}
public static void Error_TypeDoesNotContainDefinition (Location loc, Type type, string name)
{
Report.SymbolRelatedToPreviousError (type);
Report.Error (117, loc, "`{0}' does not contain a definition for `{1}'",
TypeManager.CSharpName (type), name);
}
protected static void Error_ValueAssignment (Location loc)
{
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.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");
}
}
}
///
/// Resolves an expression and performs semantic analysis on it.
///
///
///
/// Currently Resolve wraps DoResolve to perform sanity
/// checking and assertion checking on what we expect from Resolve.
///
public Expression Resolve (EmitContext 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 (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;
}
///
/// Resolves an expression and performs semantic analysis on it.
///
public Expression Resolve (EmitContext ec)
{
Expression e = Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
if (e != null && e.eclass == ExprClass.MethodGroup && RootContext.Version == LanguageVersion.ISO_1) {
((MethodGroupExpr) e).ReportUsageError ();
return null;
}
return e;
}
public Constant ResolveAsConstant (EmitContext ec, MemberCore mc)
{
Expression e = Resolve (ec);
if (e == null)
return null;
Constant c = e as Constant;
if (c != null)
return c;
Const.Error_ExpressionMustBeConstant (loc, mc.GetSignatureForError ());
return null;
}
///
/// Resolves an expression for LValue assignment
///
///
///
/// Currently ResolveLValue wraps DoResolveLValue to perform sanity
/// checking and assertion checking on what we expect from Resolve
///
public Expression ResolveLValue (EmitContext ec, Expression right_side, Location loc)
{
int errors = 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 == Report.Errors) {
if (out_access)
Report.Error (1510, loc, "A ref or out argument must be an assignable variable");
else
Error_ValueAssignment (loc);
}
return null;
}
if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e + " ExprClass is Invalid after resolve");
if (e.eclass == ExprClass.MethodGroup) {
((MethodGroupExpr) e).ReportUsageError ();
return null;
}
if ((e.type == null) && !(e is ConstructedType))
throw new Exception ("Expression " + e + " did not set its type after Resolve");
return e;
}
///
/// Emits the code for the expression
///
///
///
/// The Emit method is invoked to generate the code
/// for the expression.
///
public abstract void Emit (EmitContext ec);
public virtual void EmitBranchable (EmitContext ec, Label target, bool onTrue)
{
Emit (ec);
ec.ig.Emit (onTrue ? OpCodes.Brtrue : OpCodes.Brfalse, target);
}
///
/// Protected constructor. Only derivate types should
/// be able to be created
///
protected Expression ()
{
eclass = ExprClass.Invalid;
type = null;
}
///
/// Returns a fully formed expression after a MemberLookup
///
///
public static Expression ExprClassFromMemberInfo (Type containerType, MemberInfo mi, Location loc)
{
if (mi is EventInfo)
return new EventExpr ((EventInfo) mi, loc);
else if (mi is FieldInfo)
return new FieldExpr ((FieldInfo) mi, loc);
else if (mi is PropertyInfo)
return new PropertyExpr (containerType, (PropertyInfo) mi, loc);
else if (mi is Type){
return new TypeExpression ((System.Type) mi, loc);
}
return null;
}
protected static ArrayList almostMatchedMembers = 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 (Type container_type, Type queried_type, string name,
MemberTypes mt, BindingFlags bf, Location loc)
{
return MemberLookup (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 (Type container_type,
Type qualifier_type, Type queried_type,
string name, MemberTypes mt,
BindingFlags bf, Location loc)
{
almostMatchedMembers.Clear ();
MemberInfo [] mi = TypeManager.MemberLookup (container_type, qualifier_type,
queried_type, mt, bf, name, almostMatchedMembers);
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);
non_methods.Add (m);
continue;
}
foreach (MemberInfo n_m in non_methods) {
if (m.DeclaringType.IsInterface && TypeManager.ImplementsInterface (m.DeclaringType, n_m.DeclaringType))
continue;
Report.SymbolRelatedToPreviousError (m);
Report.Error (229, loc, "Ambiguity between `{0}' and `{1}'",
TypeManager.GetFullNameSignature (m), TypeManager.GetFullNameSignature (n_m));
return null;
}
}
if (methods.Count == 0)
return ExprClassFromMemberInfo (container_type, (MemberInfo)non_methods [0], loc);
if (non_methods != null) {
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
Report.SymbolRelatedToPreviousError (method);
Report.SymbolRelatedToPreviousError (non_method);
Report.Error (229, loc, "Ambiguity between `{0}' and `{1}'",
TypeManager.GetFullNameSignature (non_method),
TypeManager.CSharpSignature (method));
return null;
}
if (is_interface) {
Report.SymbolRelatedToPreviousError (method);
Report.SymbolRelatedToPreviousError (non_method);
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, loc);
}
if (mi [0] is MethodBase)
return new MethodGroupExpr (mi, 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 (Type container_type, Type queried_type,
string name, Location loc)
{
return MemberLookup (container_type, null, queried_type, name,
AllMemberTypes, AllBindingFlags, loc);
}
public static Expression MemberLookup (Type container_type, Type qualifier_type,
Type queried_type, string name, Location loc)
{
return MemberLookup (container_type, qualifier_type, queried_type,
name, AllMemberTypes, AllBindingFlags, loc);
}
public static MethodGroupExpr MethodLookup (Type container_type, Type queried_type,
string name, Location loc)
{
return (MethodGroupExpr)MemberLookup (container_type, null, queried_type, name,
MemberTypes.Method, AllBindingFlags, loc);
}
///
/// 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.
///
public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
Type queried_type, string name, Location loc)
{
return MemberLookupFinal (ec, qualifier_type, queried_type, name,
AllMemberTypes, AllBindingFlags, loc);
}
public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
Type queried_type, string name,
MemberTypes mt, BindingFlags bf,
Location loc)
{
Expression e;
int errors = Report.Errors;
e = MemberLookup (ec.ContainerType, qualifier_type, queried_type, name, mt, bf, loc);
if (e == null && errors == Report.Errors)
// No errors were reported by MemberLookup, but there was an error.
MemberLookupFailed (ec.ContainerType, qualifier_type, queried_type, name, null, true, loc);
return e;
}
public static void MemberLookupFailed (Type container_type, Type qualifier_type,
Type queried_type, string name,
string class_name, bool complain_if_none_found,
Location loc)
{
if (almostMatchedMembers.Count != 0) {
for (int i = 0; i < almostMatchedMembers.Count; ++i) {
MemberInfo m = (MemberInfo) almostMatchedMembers [i];
for (int j = 0; j < i; ++j) {
if (m == almostMatchedMembers [j]) {
m = null;
break;
}
}
if (m == null)
continue;
Type declaring_type = m.DeclaringType;
Report.SymbolRelatedToPreviousError (m);
if (qualifier_type == null) {
Report.Error (38, loc, "Cannot access a nonstatic member of outer type `{0}' via nested type `{1}'",
TypeManager.CSharpName (m.DeclaringType),
TypeManager.CSharpName (container_type));
} else if (qualifier_type != container_type &&
TypeManager.IsNestedFamilyAccessible (container_type, declaring_type)) {
// 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.ContainerType and the lookup succeeds with the latter one,
// then we are in this situation.
Error_CannotAccessProtected (loc, m, qualifier_type, container_type);
} else {
ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (m));
}
}
almostMatchedMembers.Clear ();
return;
}
MemberInfo[] lookup = null;
if (queried_type == null) {
class_name = "global::";
} else {
lookup = TypeManager.MemberLookup (queried_type, null, queried_type,
AllMemberTypes, AllBindingFlags |
BindingFlags.NonPublic, name, null);
}
if (lookup == null) {
if (!complain_if_none_found)
return;
if (class_name != null)
Report.Error (103, loc, "The name `{0}' does not exist in the current context",
name);
else
Error_TypeDoesNotContainDefinition (loc, queried_type, name);
return;
}
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];
Report.Error (305, loc,
"Using the generic type `{0}' " +
"requires {1} type arguments",
TypeManager.CSharpName (t),
TypeManager.GetNumberOfTypeArguments (t).ToString ());
return;
}
}
MemberList ml = TypeManager.FindMembers (queried_type, MemberTypes.Constructor,
BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.DeclaredOnly, null, null);
if (name == ".ctor" && ml.Count == 0)
{
Report.Error (143, loc, "The type `{0}' has no constructors defined", TypeManager.CSharpName (queried_type));
return;
}
Report.SymbolRelatedToPreviousError (lookup [0]);
ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (lookup [0]));
}
///
/// Returns an expression that can be used to invoke operator true
/// on the expression if it exists.
///
static public Expression GetOperatorTrue (EmitContext ec, Expression e, Location loc)
{
return GetOperatorTrueOrFalse (ec, e, true, loc);
}
///
/// Returns an expression that can be used to invoke operator false
/// on the expression if it exists.
///
static public Expression GetOperatorFalse (EmitContext ec, Expression e, Location loc)
{
return GetOperatorTrueOrFalse (ec, e, false, loc);
}
static Expression GetOperatorTrueOrFalse (EmitContext ec, Expression e, bool is_true, Location loc)
{
MethodGroupExpr operator_group;
#if GMCS_SOURCE
if (TypeManager.IsNullableType (e.Type))
return new Nullable.OperatorTrueOrFalse (e, is_true, loc).Resolve (ec);
#endif
operator_group = MethodLookup (ec.ContainerType, e.Type, is_true ? "op_True" : "op_False", loc) as MethodGroupExpr;
if (operator_group == null)
return null;
ArrayList arguments = new ArrayList (1);
arguments.Add (new Argument (e, Argument.AType.Expression));
operator_group = operator_group.OverloadResolve (
ec, arguments, false, loc);
if (operator_group == null)
return null;
return new StaticCallExpr ((MethodInfo) operator_group, arguments, loc);
}
///
/// Resolves the expression `e' into a boolean expression: either through
/// an implicit conversion, or through an `operator true' invocation
///
public static Expression ResolveBoolean (EmitContext ec, Expression e, Location loc)
{
e = e.Resolve (ec);
if (e == null)
return null;
if (e.Type == TypeManager.bool_type)
return e;
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";
}
throw new Exception ("Should not happen");
}
}
///
/// Reports that we were expecting `expr' to be of class `expected'
///
public void Error_UnexpectedKind (DeclSpace ds, string expected, Location loc)
{
Error_UnexpectedKind (ds, expected, ExprClassName, loc);
}
public void Error_UnexpectedKind (DeclSpace ds, string expected, string was, Location loc)
{
string name = GetSignatureForError ();
if (ds != null)
name = ds.GetSignatureForError () + '.' + name;
Report.Error (118, loc, "`{0}' is a `{1}' but a `{2}' was expected",
name, was, expected);
}
public void Error_UnexpectedKind (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]);
}
Report.Error (119, loc,
"Expression denotes a `{0}', where a `{1}' was expected", ExprClassName, sb.ToString ());
}
public static void UnsafeError (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.EnumToUnderlying (t));
} else if (t.IsValueType || 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.EnumToUnderlying (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 (type.IsValueType || 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;
}
public static void Error_NegativeArrayIndex (Location loc)
{
Report.Error (248, loc, "Cannot create an array with a negative size");
}
protected void Error_CannotCallAbstractBase (string name)
{
Report.Error (205, loc, "Cannot call an abstract base member `{0}'", name);
}
//
// Converts `source' to an int, uint, long or ulong.
//
public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
{
Expression target;
using (ec.With (EmitContext.Flags.CheckState, true)) {
target = Convert.ImplicitConversion (ec, source, TypeManager.int32_type, loc);
if (target == null)
target = Convert.ImplicitConversion (ec, source, TypeManager.uint32_type, loc);
if (target == null)
target = Convert.ImplicitConversion (ec, source, TypeManager.int64_type, loc);
if (target == null)
target = Convert.ImplicitConversion (ec, source, TypeManager.uint64_type, loc);
if (target == null) {
source.Error_ValueCannotBeConverted (ec, loc, TypeManager.int32_type, false);
return null;
}
}
//
// Only positive constants are allowed at compile time
//
if (target is Constant){
if (target is IntConstant){
if (((IntConstant) target).Value < 0){
Error_NegativeArrayIndex (loc);
return null;
}
}
if (target is LongConstant){
if (((LongConstant) target).Value < 0){
Error_NegativeArrayIndex (loc);
return null;
}
}
}
return target;
}
//
// 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;
}
}
///
/// 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.
///
public abstract class ExpressionStatement : Expression {
public virtual ExpressionStatement ResolveStatement (EmitContext ec)
{
Expression e = Resolve (ec);
if (e == null)
return null;
ExpressionStatement es = e as ExpressionStatement;
if (es == null)
Error_InvalidExpressionStatement ();
return es;
}
///
/// 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).
///
public abstract void EmitStatement (EmitContext ec);
}
///
/// 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".
///
///
public class EmptyCast : Expression {
protected Expression child;
public EmptyCast (Expression child, Type return_type)
{
eclass = child.eclass;
loc = child.Location;
type = return_type;
this.child = child;
}
public override Expression DoResolve (EmitContext 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 (Type valueType, out object value)
{
return child.GetAttributableValue (valueType, out value);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
EmptyCast target = (EmptyCast) t;
target.child = child.Clone (clonectx);
}
}
///
/// Performs a cast using an operator (op_Explicit or op_Implicit)
///
public class OperatorCast : EmptyCast {
MethodInfo conversion_operator;
bool find_explicit;
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)
{
this.find_explicit = find_explicit;
}
// 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) {
ParameterData pd = TypeManager.GetParameterData (oper);
if (pd.ParameterType (0) == child.Type && oper.ReturnType == type)
return oper;
}
return null;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
child.Emit (ec);
conversion_operator = GetConversionOperator (find_explicit);
if (conversion_operator == null)
throw new InternalErrorException ("Outer conversion routine is out of sync");
ig.Emit (OpCodes.Call, conversion_operator);
}
}
///
/// This is a numeric cast to a Decimal
///
public class CastToDecimal : EmptyCast {
MethodInfo conversion_operator;
public CastToDecimal (Expression child)
: this (child, false)
{
}
public CastToDecimal (Expression child, bool find_explicit)
: base (child, TypeManager.decimal_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 System.Decimal.
MethodInfo GetConversionOperator (bool find_explicit)
{
string operator_name = find_explicit ? "op_Explicit" : "op_Implicit";
MemberInfo [] mi = TypeManager.MemberLookup (type, type, type, MemberTypes.Method,
BindingFlags.Static | BindingFlags.Public, operator_name, null);
foreach (MethodInfo oper in mi) {
ParameterData pd = TypeManager.GetParameterData (oper);
if (pd.ParameterType (0) == child.Type && oper.ReturnType == type)
return oper;
}
return null;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
child.Emit (ec);
ig.Emit (OpCodes.Call, conversion_operator);
}
}
///
/// This is an explicit numeric cast from a Decimal
///
public class CastFromDecimal : EmptyCast
{
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) {
ParameterData pd = TypeManager.GetParameterData (oper);
if (pd.ParameterType (0) == TypeManager.decimal_type)
operators.Add (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 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 inCheckedContext, Type target_type)
{
// FIXME: check that 'type' can be converted to 'target_type' first
return child.ConvertExplicitly (inCheckedContext, target_type);
}
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 void Emit (EmitContext ec)
{
child.Emit (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);
}
}
///
/// This class is used to wrap literals which belong inside Enums
///
public class EnumConstant : Constant {
public Constant Child;
public EnumConstant (Constant child, Type enum_type):
base (child.Location)
{
eclass = child.eclass;
this.Child = child;
type = enum_type;
}
public override Expression DoResolve (EmitContext 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 (Type valueType, 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 ();
}
return System.Enum.ToObject (type, Child.GetValue ());
}
public override string AsString ()
{
return TypeManager.CSharpEnumValue (type, Child.GetValue ());
}
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 inCheckedContext, Type target_type)
{
if (Child.Type == target_type)
return Child;
return Child.ConvertExplicitly (inCheckedContext, 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);
}
}
///
/// 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.
///
public class BoxedCast : EmptyCast {
public BoxedCast (Expression expr, Type target_type)
: base (expr, target_type)
{
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext 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 class UnboxCast : EmptyCast {
public UnboxCast (Expression expr, Type return_type)
: base (expr, return_type)
{
}
public override Expression DoResolve (EmitContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess)
Report.Error (445, loc, "Cannot modify the result of an unboxing conversion");
return base.DoResolveLValue (ec, right_side);
}
public override void Emit (EmitContext ec)
{
Type t = type;
ILGenerator ig = ec.ig;
base.Emit (ec);
#if GMCS_SOURCE
if (t.IsGenericParameter || t.IsGenericType && t.IsValueType)
ig.Emit (OpCodes.Unbox_Any, t);
else
#endif
{
ig.Emit (OpCodes.Unbox, t);
LoadFromPtr (ig, t);
}
}
}
///
/// 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.
///
public class ConvCast : EmptyCast {
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,
U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH,
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
}
Mode mode;
public ConvCast (Expression child, Type return_type, Mode m)
: base (child, return_type)
{
mode = m;
}
public override Expression DoResolve (EmitContext 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.CheckState){
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.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.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;
}
} 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.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.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;
}
}
}
}
public class OpcodeCast : EmptyCast {
OpCode op, op2;
bool second_valid;
public OpcodeCast (Expression child, Type return_type, OpCode op)
: base (child, return_type)
{
this.op = op;
second_valid = false;
}
public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
: base (child, return_type)
{
this.op = op;
this.op2 = op2;
second_valid = true;
}
public override Expression DoResolve (EmitContext 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);
if (second_valid)
ec.ig.Emit (op2);
}
}
///
/// This kind of cast is used to encapsulate a child and cast it
/// to the class requested
///
public class ClassCast : EmptyCast {
public ClassCast (Expression child, Type return_type)
: base (child, return_type)
{
}
public override Expression DoResolve (EmitContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
if (TypeManager.IsGenericParameter (child.Type))
ec.ig.Emit (OpCodes.Box, child.Type);
#if GMCS_SOURCE
if (type.IsGenericParameter)
ec.ig.Emit (OpCodes.Unbox_Any, type);
else
#endif
ec.ig.Emit (OpCodes.Castclass, type);
}
}
///
/// SimpleName expressions are formed of a single word and only happen at the beginning
/// of a dotted-name.
///
public class SimpleName : Expression {
public readonly string Name;
public readonly TypeArguments Arguments;
bool in_transit;
public SimpleName (string name, Location l)
{
Name = name;
loc = l;
}
public SimpleName (string name, TypeArguments args, Location l)
{
Name = name;
Arguments = args;
loc = l;
}
public SimpleName (string name, TypeParameter[] type_params, Location l)
{
Name = name;
loc = l;
Arguments = new TypeArguments (l);
foreach (TypeParameter type_param in type_params)
Arguments.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), Arguments, loc);
}
public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
{
if (ec.IsFieldInitializer)
Report.Error (236, l,
"A field initializer cannot reference the nonstatic field, method, or property `{0}'",
name);
else
Report.Error (
120, l, "`{0}': An object reference is required for the nonstatic field, method or property",
name);
}
public bool IdenticalNameAndTypeName (EmitContext ec, Expression resolved_to, Location loc)
{
return resolved_to != null && resolved_to.Type != null &&
resolved_to.Type.Name == Name &&
(ec.DeclContainer.LookupNamespaceOrType (Name, loc, /* ignore_cs0104 = */ true) != null);
}
public override Expression DoResolve (EmitContext ec)
{
return SimpleNameResolve (ec, null, false);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return SimpleNameResolve (ec, right_side, false);
}
public Expression DoResolve (EmitContext ec, bool intermediate)
{
return SimpleNameResolve (ec, null, intermediate);
}
private bool IsNestedChild (Type t, Type parent)
{
if (parent == null)
return false;
while (parent != null) {
parent = TypeManager.DropGenericTypeArguments (parent);
if (TypeManager.IsNestedChildOf (t, parent))
return true;
parent = parent.BaseType;
}
return false;
}
FullNamedExpression ResolveNested (IResolveContext ec, Type t)
{
if (!TypeManager.IsGenericTypeDefinition (t) && !TypeManager.IsGenericType (t))
return null;
DeclSpace ds = ec.DeclContainer;
while (ds != null) {
if (IsNestedChild (t, ds.TypeBuilder))
break;
ds = ds.Parent;
}
if (ds == null)
return null;
Type[] gen_params = TypeManager.GetTypeArguments (t);
int arg_count = Arguments != null ? Arguments.Count : 0;
for (; (ds != null) && ds.IsGeneric; ds = ds.Parent) {
if (arg_count + ds.CountTypeParameters == gen_params.Length) {
TypeArguments new_args = new TypeArguments (loc);
foreach (TypeParameter param in ds.TypeParameters)
new_args.Add (new TypeParameterExpr (param, loc));
if (Arguments != null)
new_args.Add (Arguments);
return new ConstructedType (t, new_args, loc);
}
}
return null;
}
public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
{
FullNamedExpression fne = ec.GenericDeclContainer.LookupGeneric (Name, loc);
if (fne != null)
return fne.ResolveAsTypeStep (ec, silent);
int errors = Report.Errors;
fne = ec.DeclContainer.LookupNamespaceOrType (Name, loc, /*ignore_cs0104=*/ false);
if (fne != null) {
if (fne.Type == null)
return fne;
FullNamedExpression nested = ResolveNested (ec, fne.Type);
if (nested != null)
return nested.ResolveAsTypeStep (ec, false);
if (Arguments != null) {
ConstructedType ct = new ConstructedType (fne, Arguments, loc);
return ct.ResolveAsTypeStep (ec, false);
}
return fne;
}
if (silent || errors != Report.Errors)
return null;
Error_TypeOrNamespaceNotFound (ec);
return null;
}
protected virtual void Error_TypeOrNamespaceNotFound (IResolveContext ec)
{
MemberCore mc = ec.DeclContainer.GetDefinition (Name);
if (mc != null) {
Error_UnexpectedKind (ec.DeclContainer, "type", GetMemberType (mc), loc);
return;
}
string ns = ec.DeclContainer.NamespaceEntry.NS.Name;
string fullname = (ns.Length > 0) ? ns + "." + Name : Name;
foreach (Assembly a in RootNamespace.Global.Assemblies) {
Type type = a.GetType (fullname);
if (type != null) {
Report.SymbolRelatedToPreviousError (type);
Expression.ErrorIsInaccesible (loc, fullname);
return;
}
}
Type t = ec.DeclContainer.LookupAnyGeneric (Name);
if (t != null) {
Namespace.Error_InvalidNumberOfTypeArguments (t, loc);
return;
}
if (Arguments != null) {
FullNamedExpression retval = ec.DeclContainer.LookupNamespaceOrType (SimpleName.RemoveGenericArity (Name), loc, true);
if (retval != null) {
Namespace.Error_TypeArgumentsCannotBeUsed (retval.Type, loc, "type");
return;
}
}
NamespaceEntry.Error_NamespaceNotFound (loc, Name);
}
// 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 (EmitContext 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;
}
///
/// 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.
///
Expression DoSimpleNameResolve (EmitContext 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){
if (Arguments != null) {
Report.Error (307, loc,
"The variable `{0}' cannot be used with type arguments",
Name);
return null;
}
LocalVariableReference var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
if (right_side != null) {
return var.ResolveLValue (ec, right_side, loc);
} else {
ResolveFlags rf = ResolveFlags.VariableOrValue;
if (intermediate)
rf |= ResolveFlags.DisableFlowAnalysis;
return var.Resolve (ec, rf);
}
}
ParameterReference pref = current_block.Toplevel.GetParameterReference (Name, loc);
if (pref != null) {
if (Arguments != null) {
Report.Error (307, loc,
"The variable `{0}' cannot be used with type arguments",
Name);
return null;
}
if (right_side != null)
return pref.ResolveLValue (ec, right_side, loc);
else
return pref.Resolve (ec);
}
}
//
// Stage 2: Lookup members
//
DeclSpace lookup_ds = ec.DeclContainer;
Type almost_matched_type = null;
ArrayList almost_matched = null;
do {
if (lookup_ds.TypeBuilder == null)
break;
e = MemberLookup (ec.ContainerType, lookup_ds.TypeBuilder, Name, loc);
if (e != null)
break;
if (almost_matched == null && almostMatchedMembers.Count > 0) {
almost_matched_type = lookup_ds.TypeBuilder;
almost_matched = (ArrayList) almostMatchedMembers.Clone ();
}
lookup_ds =lookup_ds.Parent;
} while (lookup_ds != null);
if (e == null && ec.ContainerType != null)
e = MemberLookup (ec.ContainerType, ec.ContainerType, Name, loc);
if (e == null) {
if (almost_matched == null && almostMatchedMembers.Count > 0) {
almost_matched_type = ec.ContainerType;
almost_matched = (ArrayList) almostMatchedMembers.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 (Name);
return null;
}
}
if (almost_matched != null)
almostMatchedMembers = almost_matched;
if (almost_matched_type == null)
almost_matched_type = ec.ContainerType;
MemberLookupFailed (ec.ContainerType, null, almost_matched_type, Name, ec.DeclContainer.Name, true, loc);
return null;
}
if (e is TypeExpr) {
if (Arguments == null)
return e;
ConstructedType ct = new ConstructedType (
(FullNamedExpression) e, Arguments, loc);
return ct.ResolveAsTypeStep (ec, false);
}
if (e is MemberExpr) {
MemberExpr me = (MemberExpr) e;
Expression left;
if (me.IsInstance) {
if (ec.IsStatic || ec.IsFieldInitializer) {
//
// 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 EmptyExpression.Null;
}
//
// Pass the buck to MemberAccess and Invocation.
//
left = EmptyExpression.Null;
} else {
left = ec.GetThis (loc);
}
} else {
left = new TypeExpression (ec.ContainerType, loc);
}
e = me.ResolveMemberAccess (ec, left, loc, null);
if (e == null)
return null;
me = e as MemberExpr;
if (me == null)
return e;
if (Arguments != null) {
MethodGroupExpr mg = me as MethodGroupExpr;
if (mg == null)
return null;
return mg.ResolveGeneric (ec, Arguments);
}
if (!me.IsStatic && (me.InstanceExpression != 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))) {
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;
}
public override void Emit (EmitContext ec)
{
throw new InternalErrorException ("The resolve phase was not executed");
}
public override string ToString ()
{
return Name;
}
public override string GetSignatureForError ()
{
if (Arguments != null) {
return TypeManager.RemoveGenericArity (Name) + "<" +
Arguments.GetSignatureForError () + ">";
}
return Name;
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
// CloneTo: Nothing, we do not keep any state on this expression
}
}
///
/// Represents a namespace or a type. The name of the class was inspired by
/// section 10.8.1 (Fully Qualified Names).
///
public abstract class FullNamedExpression : Expression {
public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
{
return this;
}
public abstract string FullName {
get;
}
}
///
/// Expression that evaluates to a type
///
public abstract class TypeExpr : FullNamedExpression {
override public FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
{
TypeExpr t = DoResolveAsTypeStep (ec);
if (t == null)
return null;
eclass = ExprClass.Type;
return t;
}
override public Expression DoResolve (EmitContext ec)
{
return ResolveAsTypeTerminal (ec, false);
}
override public void Emit (EmitContext ec)
{
throw new Exception ("Should never be called");
}
public virtual bool CheckAccessLevel (DeclSpace ds)
{
return ds.CheckAccessLevel (Type);
}
public virtual bool AsAccessible (DeclSpace ds, int flags)
{
return ds.AsAccessible (Type, flags);
}
public virtual bool IsClass {
get { return Type.IsClass; }
}
public virtual bool IsValueType {
get { return Type.IsValueType; }
}
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 (IResolveContext ec);
public abstract string Name {
get;
}
public override bool Equals (object obj)
{
TypeExpr tobj = obj as TypeExpr;
if (tobj == null)
return false;
return Type == tobj.Type;
}
public override int GetHashCode ()
{
return Type.GetHashCode ();
}
public override string ToString ()
{
return Name;
}
}
///
/// Fully resolved Expression that already evaluated to a type
///
public class TypeExpression : TypeExpr {
public TypeExpression (Type t, Location l)
{
Type = t;
eclass = ExprClass.Type;
loc = l;
}
protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
{
return this;
}
public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
{
return this;
}
public override string Name {
get { return Type.ToString (); }
}
public override string FullName {
get { return Type.FullName; }
}
}
///
/// Used to create types from a fully qualified name. These are just used
/// by the parser to setup the core types. A TypeLookupExpression is always
/// classified as a type.
///
public sealed class TypeLookupExpression : TypeExpr {
readonly string name;
public TypeLookupExpression (string name)
{
this.name = name;
eclass = ExprClass.Type;
}
public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
{
// It's null for corlib compilation only
if (type == null)
return DoResolveAsTypeStep (ec);
return this;
}
private class UnexpectedType
{
}
// This performes recursive type lookup, providing support for generic types.
// For example, given the type:
//
// System.Collections.Generic.KeyValuePair`2[[System.Int32],[System.String]]
//
// The types will be checked in the following order:
// _
// System |
// System.Collections |
// System.Collections.Generic |
// _ |
// System | recursive call 1 |
// System.Int32 _| | main method call
// _ |
// System | recursive call 2 |
// System.String _| |
// |
// System.Collections.Generic.KeyValuePair`2[[System.Int32],[System.String]] _|
//
private Type TypeLookup (IResolveContext ec, string name)
{
int index = 0;
int dot = 0;
bool done = false;
FullNamedExpression resolved = null;
Type type = null;
Type recursive_type = null;
while (index < name.Length) {
if (name[index] == '[') {
int open = index;
int braces = 1;
do {
index++;
if (name[index] == '[')
braces++;
else if (name[index] == ']')
braces--;
} while (braces > 0);
recursive_type = TypeLookup (ec, name.Substring (open + 1, index - open - 1));
if (recursive_type == null || (recursive_type == typeof(UnexpectedType)))
return recursive_type;
}
else {
if (name[index] == ',')
done = true;
else if ((name[index] == '.' && !done) || (index == name.Length && name[0] != '[')) {
string substring = name.Substring(dot, index - dot);
if (resolved == null)
resolved = RootNamespace.Global.Lookup (ec.DeclContainer, substring, Location.Null);
else if (resolved is Namespace)
resolved = (resolved as Namespace).Lookup (ec.DeclContainer, substring, Location.Null);
else if (type != null)
type = TypeManager.GetNestedType (type, substring);
else
return null;
if (resolved == null)
return null;
else if (type == null && resolved is TypeExpr)
type = resolved.Type;
dot = index + 1;
}
}
index++;
}
if (name[0] != '[') {
string substring = name.Substring(dot, index - dot);
if (type != null)
return TypeManager.GetNestedType (type, substring);
if (resolved != null) {
resolved = (resolved as Namespace).Lookup (ec.DeclContainer, substring, Location.Null);
if (resolved is TypeExpr)
return resolved.Type;
if (resolved == null)
return null;
resolved.Error_UnexpectedKind (ec.DeclContainer, "type", loc);
return typeof (UnexpectedType);
}
else
return null;
}
else
return recursive_type;
}
protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
{
Type t = TypeLookup (ec, name);
if (t == null) {
NamespaceEntry.Error_NamespaceNotFound (loc, name);
return null;
}
if (t == typeof(UnexpectedType))
return null;
type = t;
return this;
}
public override string Name {
get { return name; }
}
public override string FullName {
get { return name; }
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
// CloneTo: Nothing, we do not keep any state on this expression
}
}
///
/// Represents an "unbound generic type", ie. typeof (Foo<>).
/// See 14.5.11.
///
public class UnboundTypeExpression : TypeExpr
{
MemberName name;
public UnboundTypeExpression (MemberName name, Location l)
{
this.name = name;
loc = l;
}
protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
{
Expression expr;
if (name.Left != null) {
Expression lexpr = name.Left.GetTypeExpression ();
expr = new MemberAccess (lexpr, name.Basename);
} else {
expr = new SimpleName (name.Basename, loc);
}
FullNamedExpression fne = expr.ResolveAsTypeStep (ec, false);
if (fne == null)
return null;
type = fne.Type;
return new TypeExpression (type, loc);
}
public override string Name {
get { return name.FullName; }
}
public override string FullName {
get { return name.FullName; }
}
}
public class TypeAliasExpression : TypeExpr {
FullNamedExpression alias;
TypeExpr texpr;
TypeArguments args;
string name;
public TypeAliasExpression (FullNamedExpression alias, TypeArguments args, Location l)
{
this.alias = alias;
this.args = args;
loc = l;
eclass = ExprClass.Type;
if (args != null)
name = alias.FullName + "<" + args.ToString () + ">";
else
name = alias.FullName;
}
public override string Name {
get { return alias.FullName; }
}
public override string FullName {
get { return name; }
}
protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
{
texpr = alias.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
Type type = texpr.Type;
int num_args = TypeManager.GetNumberOfTypeArguments (type);
if (args != null) {
if (num_args == 0) {
Report.Error (308, loc,
"The non-generic type `{0}' cannot " +
"be used with type arguments.",
TypeManager.CSharpName (type));
return null;
}
ConstructedType ctype = new ConstructedType (type, args, loc);
return ctype.ResolveAsTypeTerminal (ec, false);
} else if (num_args > 0) {
Report.Error (305, loc,
"Using the generic type `{0}' " +
"requires {1} type arguments",
TypeManager.CSharpName (type), num_args.ToString ());
return null;
}
return texpr;
}
public override bool CheckAccessLevel (DeclSpace ds)
{
return texpr.CheckAccessLevel (ds);
}
public override bool AsAccessible (DeclSpace ds, int flags)
{
return texpr.AsAccessible (ds, flags);
}
public override bool IsClass {
get { return texpr.IsClass; }
}
public override bool IsValueType {
get { return texpr.IsValueType; }
}
public override bool IsInterface {
get { return texpr.IsInterface; }
}
public override bool IsSealed {
get { return texpr.IsSealed; }
}
}
///
/// This class denotes an expression which evaluates to a member
/// of a struct or a class.
///
public abstract class MemberExpr : Expression
{
///
/// The name of this member.
///
public abstract string Name {
get;
}
///
/// Whether this is an instance member.
///
public abstract bool IsInstance {
get;
}
///
/// Whether this is a static member.
///
public abstract bool IsStatic {
get;
}
///
/// The type which declares this member.
///
public abstract Type DeclaringType {
get;
}
///
/// The instance expression associated with this member, if it's a
/// non-static member.
///
public Expression InstanceExpression;
public static void error176 (Location loc, string name)
{
Report.Error (176, loc, "Static member `{0}' cannot be accessed " +
"with an instance reference, qualify it with a type name instead", name);
}
// TODO: possible optimalization
// Cache resolved constant result in FieldBuilder <-> expression map
public virtual Expression ResolveMemberAccess (EmitContext ec, Expression left, Location loc,
SimpleName original)
{
//
// Precondition:
// original == null || original.Resolve (...) ==> left
//
if (left is TypeExpr) {
left = left.ResolveAsTypeTerminal (ec, true);
if (left == null)
return null;
if (!IsStatic) {
SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
}
return this;
}
if (!IsInstance) {
if (original != null && original.IdenticalNameAndTypeName (ec, left, loc))
return this;
error176 (loc, GetSignatureForError ());
return null;
}
InstanceExpression = left;
return this;
}
protected void EmitInstance (EmitContext ec, bool prepare_for_load)
{
if (IsStatic)
return;
if (InstanceExpression == EmptyExpression.Null) {
SimpleName.Error_ObjectRefRequired (ec, loc, GetSignatureForError ());
return;
}
if (InstanceExpression.Type.IsValueType) {
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);
}
}
///
/// Represents group of extension methods
///
public class ExtensionMethodGroupExpr : MethodGroupExpr
{
readonly NamespaceEntry namespaceEntry;
public Expression ExtensionExpression;
public ExtensionMethodGroupExpr (ArrayList list, NamespaceEntry n, Type extensionType, Location l)
: base (list, l)
{
this.namespaceEntry = n;
this.type = extensionType;
}
public override bool IsBase {
get { return true; }
}
public override bool IsStatic {
get { return true; }
}
public bool IsTopLevel {
get { return namespaceEntry == null; }
}
public override void EmitArguments (EmitContext ec, ArrayList arguments)
{
if (arguments == null)
arguments = new ArrayList (1);
arguments.Insert (0, new Argument (ExtensionExpression));
base.EmitArguments (ec, arguments);
}
public override void EmitCall (EmitContext ec, ArrayList arguments)
{
if (arguments == null)
arguments = new ArrayList (1);
arguments.Insert (0, new Argument (ExtensionExpression));
base.EmitCall (ec, arguments);
}
public override MethodGroupExpr OverloadResolve (EmitContext ec, ArrayList arguments, bool may_fail, Location loc)
{
if ((ExtensionExpression.eclass & (ExprClass.Value | ExprClass.Variable)) == 0)
return base.OverloadResolve (ec, arguments, may_fail, loc);
if (arguments == null)
arguments = new ArrayList (1);
arguments.Insert (0, new Argument (ExtensionExpression));
MethodGroupExpr mg = ResolveOverloadExtensions (ec, arguments, namespaceEntry, loc);
// Restore original arguments
arguments.RemoveAt (0);
if (mg != null)
return mg;
if (!may_fail)
return base.OverloadResolve (ec, arguments, may_fail, loc);
return null;
}
MethodGroupExpr ResolveOverloadExtensions (EmitContext ec, ArrayList arguments, NamespaceEntry ns, Location loc)
{
// Use normal resolve rules
MethodGroupExpr mg = base.OverloadResolve (ec, arguments, true, loc);
if (mg != null)
return mg;
// Search continues
ExtensionMethodGroupExpr e = ns.LookupExtensionMethod (type, null, Name);
if (e == null)
return null;
e.ExtensionExpression = ExtensionExpression;
return e.ResolveOverloadExtensions (ec, arguments, e.namespaceEntry, loc);
}
}
///
/// MethodGroupExpr represents a group of method candidates which
/// can be resolved to the best method overload
///
public class MethodGroupExpr : MemberExpr {
public readonly MethodBase [] Methods;
MethodBase best_candidate;
bool has_type_arguments;
bool identical_type_name;
bool is_base;
public MethodGroupExpr (MemberInfo [] mi, Location l)
{
Methods = new MethodBase [mi.Length];
mi.CopyTo (Methods, 0);
eclass = ExprClass.MethodGroup;
// Set the type to something that will never be useful, which will
// trigger the proper conversions.
type = typeof (MethodGroupExpr);
loc = l;
}
public MethodGroupExpr (ArrayList list, Location 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;
}
loc = l;
eclass = ExprClass.MethodGroup;
type = TypeManager.object_type;
}
public override Type DeclaringType {
get {
//
// We assume that the top-level type is in the end
//
return Methods [Methods.Length - 1].DeclaringType;
//return Methods [0].DeclaringType;
}
}
public bool HasTypeArguments {
get {
return has_type_arguments;
}
set {
has_type_arguments = value;
}
}
public bool IdenticalTypeName {
get {
return identical_type_name;
}
set {
identical_type_name = value;
}
}
public virtual bool IsBase {
get {
return is_base;
}
set {
is_base = value;
}
}
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 {
foreach (MethodBase mb in Methods)
if (!mb.IsStatic)
return true;
return false;
}
}
public override bool IsStatic {
get {
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;
}
///
/// Determines "better conversion" as specified in 14.4.2.3
///
/// Returns : p if a->p is better,
/// q if a->q is better,
/// null if neither is better
///
static Type BetterConversion (EmitContext ec, Argument a, Type p, Type q)
{
Type argument_type = TypeManager.TypeToCoreType (a.Type);
Expression argument_expr = a.Expr;
if (argument_type == null)
throw new Exception ("Expression of type " + a.Expr +
" does not resolve its type");
if (p == null || q == null)
throw new InternalErrorException ("BetterConversion Got a null conversion");
if (p == q)
return null;
if (argument_expr is NullLiteral)
{
//
// If the argument is null and one of the types to compare is 'object' and
// the other is a reference type, we prefer the other.
//
// This follows from the usual rules:
// * There is an implicit conversion from 'null' to type 'object'
// * There is an implicit conversion from 'null' to any reference type
// * There is an implicit conversion from any reference type to type 'object'
// * There is no implicit conversion from type 'object' to other reference types
// => Conversion of 'null' to a reference type is better than conversion to 'object'
//
// FIXME: This probably isn't necessary, since the type of a NullLiteral is the
// null type. I think it used to be 'object' and thus needed a special
// case to avoid the immediately following two checks.
//
if (!p.IsValueType && q == TypeManager.object_type)
return p;
if (!q.IsValueType && p == TypeManager.object_type)
return q;
}
if (argument_type == p)
return p;
if (argument_type == q)
return q;
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 p;
if (q_to_p && !p_to_q)
return q;
if (p == TypeManager.sbyte_type)
if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
q == TypeManager.uint32_type || q == TypeManager.uint64_type)
return p;
if (q == TypeManager.sbyte_type)
if (p == TypeManager.byte_type || p == TypeManager.ushort_type ||
p == TypeManager.uint32_type || p == TypeManager.uint64_type)
return q;
if (p == TypeManager.short_type)
if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
q == TypeManager.uint64_type)
return p;
if (q == TypeManager.short_type)
if (p == TypeManager.ushort_type || p == TypeManager.uint32_type ||
p == TypeManager.uint64_type)
return q;
if (p == TypeManager.int32_type)
if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
return p;
if (q == TypeManager.int32_type)
if (p == TypeManager.uint32_type || p == TypeManager.uint64_type)
return q;
if (p == TypeManager.int64_type)
if (q == TypeManager.uint64_type)
return p;
if (q == TypeManager.int64_type)
if (p == TypeManager.uint64_type)
return q;
return null;
}
///
/// Determines "Better function" between candidate
/// and the current best match
///
///
/// Returns a boolean indicating :
/// false if candidate ain't better
/// true if candidate is better than the current best match
///
static bool BetterFunction (EmitContext ec, ArrayList args, int argument_count,
MethodBase candidate, bool candidate_params,
MethodBase best, bool best_params)
{
ParameterData candidate_pd = TypeManager.GetParameterData (candidate);
ParameterData 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 = (Argument) args [j];
Type ct = TypeManager.TypeToCoreType (candidate_pd.ParameterType (c_idx));
Type bt = TypeManager.TypeToCoreType (best_pd.ParameterType (b_idx));
if (candidate_params && candidate_pd.ParameterModifier (c_idx) == Parameter.Modifier.PARAMS)
{
ct = TypeManager.GetElementType (ct);
--c_idx;
}
if (best_params && best_pd.ParameterModifier (b_idx) == Parameter.Modifier.PARAMS)
{
bt = TypeManager.GetElementType (bt);
--b_idx;
}
if (ct.Equals (bt))
continue;
same = false;
Type better = BetterConversion (ec, a, ct, bt);
// for each argument, the conversion to 'ct' should be no worse than
// the conversion to 'bt'.
if (better == bt)
return false;
// for at least one argument, the conversion to 'ct' should be better than
// the conversion to 'bt'.
if (better == ct)
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) && !TypeManager.IsGenericMethod (candidate))
return true;
if (!TypeManager.IsGenericMethod (best) && 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;
//
// 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);
ParameterData orig_candidate_pd = TypeManager.GetParameterData (orig_candidate);
ParameterData orig_best_pd = TypeManager.GetParameterData (orig_best);
bool specific_at_least_once = false;
for (int j = 0; j < candidate_param_count; ++j)
{
Type ct = TypeManager.TypeToCoreType (orig_candidate_pd.ParameterType (j));
Type bt = TypeManager.TypeToCoreType (orig_best_pd.ParameterType (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;
}
public override Expression ResolveMemberAccess (EmitContext ec, Expression left, Location loc,
SimpleName original)
{
if (!(left is TypeExpr) &&
original != null && original.IdenticalNameAndTypeName (ec, left, loc))
IdenticalTypeName = true;
return base.ResolveMemberAccess (ec, left, loc, original);
}
override public Expression DoResolve (EmitContext ec)
{
if (InstanceExpression != null) {
InstanceExpression = InstanceExpression.DoResolve (ec);
if (InstanceExpression == null)
return null;
}
return this;
}
public void ReportUsageError ()
{
Report.Error (654, loc, "Method `" + DeclaringType + "." +
Name + "()' is referenced without parentheses");
}
override public void Emit (EmitContext ec)
{
ReportUsageError ();
}
public virtual void EmitArguments (EmitContext ec, ArrayList arguments)
{
Invocation.EmitArguments (ec, best_candidate, arguments, false, null);
}
public virtual void EmitCall (EmitContext ec, ArrayList arguments)
{
Invocation.EmitCall (ec, IsBase, InstanceExpression, best_candidate, arguments, loc);
}
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));
}
public static bool IsOverride (MethodBase cand_method, MethodBase base_method)
{
if (!IsAncestralType (base_method.DeclaringType, cand_method.DeclaringType))
return false;
ParameterData cand_pd = TypeManager.GetParameterData (cand_method);
ParameterData 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.ParameterModifier (j);
Parameter.Modifier bm = base_pd.ParameterModifier (j);
Type ct = TypeManager.TypeToCoreType (cand_pd.ParameterType (j));
Type bt = TypeManager.TypeToCoreType (base_pd.ParameterType (j));
if (cm != bm || ct != bt)
return false;
}
return true;
}
public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2, Location loc)
{
MemberInfo [] miset;
MethodGroupExpr union;
if (mg1 == null) {
if (mg2 == null)
return null;
return (MethodGroupExpr) mg2;
} else {
if (mg2 == null)
return (MethodGroupExpr) mg1;
}
MethodGroupExpr left_set = null, right_set = null;
int length1 = 0, length2 = 0;
left_set = (MethodGroupExpr) mg1;
length1 = left_set.Methods.Length;
right_set = (MethodGroupExpr) mg2;
length2 = right_set.Methods.Length;
ArrayList common = new ArrayList ();
foreach (MethodBase r in right_set.Methods){
if (TypeManager.ArrayContainsMethod (left_set.Methods, r))
common.Add (r);
}
miset = new MemberInfo [length1 + length2 - common.Count];
left_set.Methods.CopyTo (miset, 0);
int k = length1;
foreach (MethodBase r in right_set.Methods) {
if (!common.Contains (r))
miset [k++] = r;
}
union = new MethodGroupExpr (miset, loc);
return union;
}
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 (pargs [i], 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;
}
///
/// 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.
///
///
public virtual MethodGroupExpr OverloadResolve (EmitContext ec, ArrayList Arguments,
bool may_fail, Location loc)
{
bool method_params = false;
Type applicable_type = null;
int arg_count = 0;
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;
if (Arguments != null)
arg_count = Arguments.Count;
if (RootContext.Version == LanguageVersion.ISO_1 && Name == "Invoke" && TypeManager.IsDelegateType (DeclaringType)) {
if (!may_fail)
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 GMCS_SOURCE
Type [] gen_args = null;
if (m.IsGenericMethod && !m.IsGenericMethodDefinition)
gen_args = m.GetGenericArguments ();
#endif
if (TypeManager.IsOverride (m)) {
if (candidate_overrides == null)
candidate_overrides = new ArrayList ();
candidate_overrides.Add (m);
m = TypeManager.TryGetBaseDefinition (m);
#if GMCS_SOURCE
if (m != null && gen_args != null) {
if (!m.IsGenericMethodDefinition)
throw new InternalErrorException ("GetBaseDefinition didn't return a GenericMethodDefinition");
m = ((MethodInfo) m).MakeGenericMethod (gen_args);
}
#endif
}
if (m != null)
Methods [j++] = m;
}
nmethods = j;
}
int applicable_errors = Report.Errors;
//
// First we construct the set of applicable methods
//
bool is_sorted = true;
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)
// Is candidate applicable in normal form?
//
bool is_applicable = Invocation.IsApplicable (ec, this, Arguments, arg_count, ref Methods [i]);
if (!is_applicable && Invocation.IsParamsMethodApplicable (ec, this, Arguments, arg_count, ref Methods [i])) {
MethodBase candidate = Methods [i];
if (candidate_to_form == null)
candidate_to_form = new PtrHashtable ();
candidate_to_form [candidate] = candidate;
// Candidate is applicable in expanded form
is_applicable = true;
}
if (!is_applicable)
continue;
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;
}
}
if (applicable_errors != Report.Errors)
return null;
int candidate_top = candidates.Count;
if (applicable_type == null) {
if (ec.IsInProbingMode)
return null;
//
// Okay so we have failed to find anything so we
// return by providing info about the closest match
//
int errors = Report.Errors;
for (int i = 0; i < nmethods; ++i) {
MethodBase c = Methods [i];
ParameterData pd = TypeManager.GetParameterData (c);
if (pd.Count != arg_count)
continue;
#if GMCS_SOURCE
if (!TypeManager.InferTypeArguments (ec, Arguments, ref c))
continue;
if (TypeManager.IsGenericMethodDefinition (c))
continue;
#endif
Invocation.VerifyArgumentsCompat (ec, Arguments, arg_count,
c, false, null, may_fail, loc);
if (!may_fail && errors == Report.Errors){
throw new InternalErrorException (
"VerifyArgumentsCompat and IsApplicable do not agree; " +
"likely reason: ImplicitConversion and ImplicitConversionExists have gone out of sync");
}
break;
}
if (!may_fail && errors == Report.Errors) {
string report_name = Name;
if (report_name == ".ctor")
report_name = TypeManager.CSharpName (DeclaringType);
#if GMCS_SOURCE
//
// Type inference
//
for (int i = 0; i < Methods.Length; ++i) {
MethodBase c = Methods [i];
ParameterData pd = TypeManager.GetParameterData (c);
if (pd.Count != arg_count)
continue;
if (TypeManager.InferTypeArguments (ec, Arguments, ref c))
continue;
Report.Error (
411, loc, "The type arguments for " +
"method `{0}' cannot be inferred from " +
"the usage. Try specifying the type " +
"arguments explicitly", TypeManager.CSharpSignature (c));
return null;
}
#endif
Invocation.Error_WrongNumArguments (loc, report_name, 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);
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, Arguments, 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 = 0; 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, Arguments, arg_count,
best_candidate, method_params,
candidate, cand_params))
{
if (!may_fail)
Report.SymbolRelatedToPreviousError (candidate);
ambiguous = candidate;
}
}
if (ambiguous != null) {
Report.SymbolRelatedToPreviousError (best_candidate);
Report.Error (121, loc, "The call is ambiguous between the following methods or properties: `{0}' and `{1}'",
TypeManager.CSharpSignature (ambiguous), TypeManager.CSharpSignature (best_candidate));
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)
foreach (MethodBase candidate in candidate_overrides) {
if (IsOverride (candidate, best_candidate))
best_candidate = candidate;
}
}
//
// And now check if the arguments are all
// compatible, perform conversions if
// necessary etc. and return if everything is
// all right
//
if (!Invocation.VerifyArgumentsCompat (ec, Arguments, arg_count, best_candidate,
method_params, null, may_fail, loc))
return null;
if (best_candidate == null)
return null;
MethodBase the_method = TypeManager.DropGenericMethodArguments (best_candidate);
#if GMCS_SOURCE
if (the_method.IsGenericMethodDefinition &&
!ConstraintChecker.CheckConstraints (ec, the_method, best_candidate, loc))
return null;
#endif
IMethodData data = TypeManager.GetMethod (the_method);
if (data != null)
data.SetMemberIsUsed ();
return this;
}
public Expression ResolveGeneric (EmitContext ec, TypeArguments args)
{
#if GMCS_SOURCE
if (!args.Resolve (ec))
return null;
Type[] atypes = args.Arguments;
int first_count = 0;
MethodInfo first = null;
ArrayList list = new ArrayList ();
foreach (MethodBase mb in Methods) {
MethodInfo mi = mb as MethodInfo;
if ((mi == null) || !mb.IsGenericMethod)
continue;
Type[] gen_params = mb.GetGenericArguments ();
if (first == null) {
first = mi;
first_count = gen_params.Length;
}
if (gen_params.Length != atypes.Length)
continue;
mi = mi.MakeGenericMethod (atypes);
list.Add (mi);
#if MS_COMPATIBLE
// MS implementation throws NotSupportedException for GetParameters
// on unbaked generic method
Parameters p = TypeManager.GetParameterData (mi) as Parameters;
if (p != null) {
p = p.Clone ();
p.InflateTypes (gen_params, atypes);
TypeManager.RegisterMethod (mi, p);
}
#endif
}
if (list.Count > 0) {
MethodGroupExpr new_mg = new MethodGroupExpr (list, Location);
new_mg.InstanceExpression = InstanceExpression;
new_mg.HasTypeArguments = true;
new_mg.IsBase = IsBase;
return new_mg;
}
if (first != null) {
Report.SymbolRelatedToPreviousError (first);
Report.Error (
305, loc, "Using the generic method `{0}' requires `{1}' type arguments",
TypeManager.CSharpSignature (first), first_count.ToString ());
} else
Report.Error (
308, loc, "The non-generic method `{0}' " +
"cannot be used with type arguments", Name);
return null;
#else
throw new NotImplementedException ();
#endif
}
}
///
/// Fully resolved expression that evaluates to a Field
///
public class FieldExpr : MemberExpr, IAssignMethod, IMemoryLocation, IVariable {
public readonly FieldInfo FieldInfo;
VariableInfo variable_info;
LocalTemporary temp;
bool prepared;
bool in_initializer;
public FieldExpr (FieldInfo fi, Location l, bool in_initializer):
this (fi, l)
{
this.in_initializer = in_initializer;
}
public FieldExpr (FieldInfo fi, Location l)
{
FieldInfo = fi;
eclass = ExprClass.Variable;
type = TypeManager.TypeToCoreType (fi.FieldType);
loc = l;
}
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 Expression ResolveMemberAccess (EmitContext ec, Expression left, Location loc,
SimpleName original)
{
FieldInfo fi = TypeManager.GetGenericFieldDefinition (FieldInfo);
Type t = fi.FieldType;
if (fi.IsLiteral || (fi.IsInitOnly && t == TypeManager.decimal_type)) {
IConstant ic = TypeManager.GetConstant (fi);
if (ic == null) {
if (fi.IsLiteral) {
ic = new ExternalConstant (fi);
} else {
ic = ExternalConstant.CreateDecimal (fi);
if (ic == null) {
return base.ResolveMemberAccess (ec, left, loc, original);
}
}
TypeManager.RegisterConstant (fi, ic);
}
bool left_is_type = left is TypeExpr;
if (!left_is_type && (original == null || !original.IdenticalNameAndTypeName (ec, left, loc))) {
Report.SymbolRelatedToPreviousError (FieldInfo);
error176 (loc, TypeManager.GetFullNameSignature (FieldInfo));
return null;
}
if (ic.ResolveValue ()) {
if (!ec.IsInObsoleteScope)
ic.CheckObsoleteness (loc);
}
return ic.CreateConstantReference (loc);
}
if (t.IsPointer && !ec.InUnsafe) {
UnsafeError (loc);
}
return base.ResolveMemberAccess (ec, left, loc, original);
}
override public Expression DoResolve (EmitContext ec)
{
return DoResolve (ec, false, false);
}
Expression DoResolve (EmitContext 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 (EmitContext.Flags.DoFlowAnalysis, false)) {
Expression right_side =
out_access ? EmptyExpression.LValueMemberOutAccess : EmptyExpression.LValueMemberAccess;
InstanceExpression = InstanceExpression.ResolveLValue (ec, right_side, loc);
}
} else {
ResolveFlags rf = ResolveFlags.VariableOrValue | ResolveFlags.DisableFlowAnalysis;
InstanceExpression = InstanceExpression.Resolve (ec, rf);
}
if (InstanceExpression == null)
return null;
InstanceExpression.CheckMarshalByRefAccess ();
}
if (!in_initializer && !ec.IsFieldInitializer) {
ObsoleteAttribute oa;
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null) {
if (!ec.IsInObsoleteScope)
f.CheckObsoleteness (loc);
// To be sure that type is external because we do not register generated fields
} else if (!(FieldInfo.DeclaringType is TypeBuilder)) {
oa = AttributeTester.GetMemberObsoleteAttribute (FieldInfo);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, TypeManager.GetFullNameSignature (FieldInfo), loc);
}
}
AnonymousContainer am = ec.CurrentAnonymousMethod;
if (am != null){
if (!FieldInfo.IsStatic){
if (!am.IsIterator && (ec.TypeContainer is Struct)){
Report.Error (1673, loc,
"Anonymous methods inside structs cannot access instance members of `{0}'. Consider copying `{0}' to a local variable outside the anonymous method and using the local instead",
"this");
return null;
}
}
}
IFixedBuffer fb = AttributeTester.GetFixedBuffer (FieldInfo);
if (fb != null) {
if (!ec.InFixedInitializer && ec.ContainerType.IsValueType) {
Report.Error (1666, loc, "You cannot use fixed size buffers contained in unfixed expressions. Try using the fixed statement");
}
if (!(InstanceExpression is LocalVariableReference) &&
!(InstanceExpression is This)) {
Report.SymbolRelatedToPreviousError (FieldInfo);
Report.Error (1708, loc, "`{0}': Fixed size buffers can only be accessed through locals or fields",
TypeManager.GetFullNameSignature (FieldInfo));
}
return new FixedBufferPtr (this, fb.ElementType, loc).Resolve (ec);
}
// If the instance expression is a local variable or parameter.
IVariable var = InstanceExpression as IVariable;
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);
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 (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;
Report.Error (codes [i], loc, msgs [i], GetSignatureForError ());
return null;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
IVariable var = InstanceExpression as IVariable;
if ((var != null) && (var.VariableInfo != null))
var.VariableInfo.SetFieldAssigned (ec, FieldInfo.Name);
bool lvalue_instance = !FieldInfo.IsStatic && FieldInfo.DeclaringType.IsValueType;
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 (FieldInfo.IsInitOnly) {
// InitOnly fields can only be assigned in constructors or initializers
if (!ec.IsFieldInitializer && !ec.IsConstructor)
return Report_AssignToReadonly (right_side);
if (ec.IsConstructor) {
Type ctype = ec.TypeContainer.CurrentType;
if (ctype == null)
ctype = ec.ContainerType;
// InitOnly fields cannot be assigned-to in a different constructor from their declaring type
if (!TypeManager.IsEqual (ctype, FieldInfo.DeclaringType))
return Report_AssignToReadonly (right_side);
// static InitOnly fields cannot be assigned-to in an instance constructor
if (IsStatic && !ec.IsStatic)
return Report_AssignToReadonly (right_side);
// instance constructors can't modify InitOnly fields of other instances of the same type
if (!IsStatic && !(InstanceExpression is This))
return Report_AssignToReadonly (right_side);
}
}
if (right_side == EmptyExpression.OutAccess &&
!IsStatic && !(InstanceExpression is This) && DeclaringType.IsSubclassOf (TypeManager.mbr_type)) {
Report.SymbolRelatedToPreviousError (DeclaringType);
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 ());
}
return this;
}
public override void CheckMarshalByRefAccess ()
{
if (!IsStatic && Type.IsValueType && !(InstanceExpression is This) && DeclaringType.IsSubclassOf (TypeManager.mbr_type)) {
Report.SymbolRelatedToPreviousError (DeclaringType);
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 bool VerifyFixed ()
{
IVariable variable = InstanceExpression as IVariable;
// A variable of the form V.I is fixed when V is a fixed variable of a struct type.
// We defer the InstanceExpression check after the variable check to avoid a
// separate null check on InstanceExpression.
return variable != null && InstanceExpression.Type.IsValueType && variable.VerifyFixed ();
}
public override int GetHashCode ()
{
return FieldInfo.GetHashCode ();
}
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, FieldInfo);
} else {
if (!prepared)
EmitInstance (ec, false);
IFixedBuffer ff = AttributeTester.GetFixedBuffer (FieldInfo);
if (ff != null) {
ig.Emit (OpCodes.Ldflda, FieldInfo);
ig.Emit (OpCodes.Ldflda, ff.Element);
} else {
if (is_volatile)
ig.Emit (OpCodes.Volatile);
ig.Emit (OpCodes.Ldfld, FieldInfo);
}
}
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;
bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
ILGenerator ig = ec.ig;
prepared = prepare_for_load;
if (is_readonly && !ec.IsConstructor){
Report_AssignToReadonly (source);
return;
}
EmitInstance (ec, prepare_for_load);
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, FieldInfo);
else
ig.Emit (OpCodes.Stfld, FieldInfo);
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
}
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
ILGenerator ig = ec.ig;
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null){
if ((f.ModFlags & Modifiers.VOLATILE) != 0){
Report.Warning (420, 1, loc, "`{0}': A volatile field references will not be treated as volatile",
f.GetSignatureForError ());
}
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.IsConstructor){
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, FieldInfo);
} else {
if (!prepared)
EmitInstance (ec, false);
ig.Emit (OpCodes.Ldflda, FieldInfo);
}
}
}
//
// A FieldExpr whose address can not be taken
//
public class FieldExprNoAddress : FieldExpr, IMemoryLocation {
public FieldExprNoAddress (FieldInfo fi, Location loc) : base (fi, loc)
{
}
public new void AddressOf (EmitContext ec, AddressOp mode)
{
Report.Error (-215, "Report this: Taking the address of a remapped parameter not supported");
}
}
///
/// 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.
///
public class PropertyExpr : MemberExpr, IAssignMethod {
public readonly PropertyInfo PropertyInfo;
//
// This is set externally by the `BaseAccess' class
//
public bool IsBase;
MethodInfo getter, setter;
bool is_static;
bool resolved;
LocalTemporary temp;
bool prepared;
public PropertyExpr (Type containerType, PropertyInfo pi, Location l)
{
PropertyInfo = pi;
eclass = ExprClass.PropertyAccess;
is_static = false;
loc = l;
type = TypeManager.TypeToCoreType (pi.PropertyType);
ResolveAccessors (containerType);
}
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 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 containerType)
{
FindAccessors (containerType);
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;
}
}
bool InstanceResolve (EmitContext 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, loc);
if (InstanceExpression == null)
return false;
InstanceExpression.CheckMarshalByRefAccess ();
if (must_do_cs1540_check && (InstanceExpression != EmptyExpression.Null) &&
!TypeManager.IsInstantiationOfSameGenericType (InstanceExpression.Type, ec.ContainerType) &&
!TypeManager.IsNestedChildOf (ec.ContainerType, InstanceExpression.Type) &&
!TypeManager.IsSubclassOf (InstanceExpression.Type, ec.ContainerType)) {
Report.SymbolRelatedToPreviousError (PropertyInfo);
Error_CannotAccessProtected (loc, PropertyInfo, InstanceExpression.Type, ec.ContainerType);
return false;
}
return true;
}
void Error_PropertyNotFound (MethodInfo mi, bool getter)
{
// TODO: correctly we should compare arguments but it will lead to bigger changes
if (mi is MethodBuilder) {
Error_TypeDoesNotContainDefinition (loc, PropertyInfo.DeclaringType, Name);
return;
}
StringBuilder sig = new StringBuilder (TypeManager.CSharpName (mi.DeclaringType));
sig.Append ('.');
ParameterData iparams = TypeManager.GetParameterData (mi);
sig.Append (getter ? "get_" : "set_");
sig.Append (Name);
sig.Append (iparams.GetSignatureForError ());
Report.SymbolRelatedToPreviousError (mi);
Report.Error (1546, loc, "Property `{0}' is not supported by the C# language. Try to call the accessor method `{1}' directly",
Name, sig.ToString ());
}
override public Expression DoResolve (EmitContext ec)
{
if (resolved)
return this;
if (getter != null){
if (TypeManager.GetParameterData (getter).Count != 0){
Error_PropertyNotFound (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) {
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.ContainerType, getter, out must_do_cs1540_check)) {
PropertyBase.PropertyMethod pm = TypeManager.GetMethod (getter) as PropertyBase.PropertyMethod;
if (pm != null && pm.HasCustomAccessModifier) {
Report.SymbolRelatedToPreviousError (pm);
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 {
Report.SymbolRelatedToPreviousError (getter);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (getter));
}
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 (TypeManager.GetFullNameSignature (PropertyInfo));
return null;
}
if (PropertyInfo.PropertyType.IsPointer && !ec.InUnsafe){
UnsafeError (loc);
return null;
}
resolved = true;
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (right_side == EmptyExpression.OutAccess) {
Report.Error (206, loc, "A property or indexer `{0}' may not be passed as an out or ref parameter",
GetSignatureForError ());
return null;
}
if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess) {
Report.Error (1612, loc, "Cannot modify the return value of `{0}' because it is not a variable",
GetSignatureForError ());
return null;
}
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;
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 (setter, false);
return null;
}
bool must_do_cs1540_check;
if (!IsAccessorAccessible (ec.ContainerType, setter, out must_do_cs1540_check)) {
PropertyBase.PropertyMethod pm = TypeManager.GetMethod (setter) as PropertyBase.PropertyMethod;
if (pm != null && pm.HasCustomAccessModifier) {
Report.SymbolRelatedToPreviousError (pm);
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 {
Report.SymbolRelatedToPreviousError (setter);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (setter));
}
return null;
}
if (!InstanceResolve (ec, PropertyInfo.DeclaringType.IsValueType, must_do_cs1540_check))
return null;
//
// Only base will allow this invocation to happen.
//
if (IsBase && setter.IsAbstract){
Error_CannotCallAbstractBase (TypeManager.GetFullNameSignature (PropertyInfo));
return null;
}
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 ((getter == TypeManager.system_int_array_get_length) ||
(getter == TypeManager.int_array_get_length)){
Type iet = InstanceExpression.Type;
//
// System.Array.Length can be called, but the Type does not
// support invoking GetArrayRank, so test for that case first
//
if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)) {
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;
prepared = prepare_for_load;
if (prepared) {
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);
if (!is_static) {
temp = new LocalTemporary (this.Type);
temp.Store (ec);
}
my_source = temp;
}
ArrayList args = new ArrayList (1);
args.Add (new Argument (my_source, Argument.AType.Expression));
Invocation.EmitCall (ec, IsBase, InstanceExpression, setter, args, loc, false, prepared);
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
}
}
}
///
/// Fully resolved expression that evaluates to an Event
///
public class EventExpr : MemberExpr {
public readonly EventInfo EventInfo;
bool is_static;
MethodInfo add_accessor, remove_accessor;
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 override Expression ResolveMemberAccess (EmitContext 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.ContainerType ||
TypeManager.IsNestedChildOf(ec.ContainerType, EventInfo.DeclaringType)) {
EventField mi = TypeManager.GetEventField (EventInfo);
if (mi != null) {
if (!ec.IsInObsoleteScope)
mi.CheckObsoleteness (loc);
FieldExpr ml = new FieldExpr (mi.FieldBuilder, loc);
InstanceExpression = null;
return ml.ResolveMemberAccess (ec, left, loc, original);
}
}
return base.ResolveMemberAccess (ec, left, loc, original);
}
bool InstanceResolve (EmitContext 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;
//
// This is using the same mechanism as the CS1540 check in PropertyExpr.
// However, in the Event case, we reported a CS0122 instead.
//
if (must_do_cs1540_check && InstanceExpression != EmptyExpression.Null &&
InstanceExpression.Type != ec.ContainerType &&
ec.ContainerType.IsSubclassOf (InstanceExpression.Type)) {
Report.SymbolRelatedToPreviousError (EventInfo);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (EventInfo));
return false;
}
return true;
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return DoResolve (ec);
}
public override Expression DoResolve (EmitContext ec)
{
bool must_do_cs1540_check;
if (!(IsAccessorAccessible (ec.ContainerType, add_accessor, out must_do_cs1540_check) &&
IsAccessorAccessible (ec.ContainerType, remove_accessor, out must_do_cs1540_check))) {
Report.SymbolRelatedToPreviousError (EventInfo);
ErrorIsInaccesible (loc, TypeManager.CSharpSignature (EventInfo));
return null;
}
if (!InstanceResolve (ec, must_do_cs1540_check))
return null;
return this;
}
public override void Emit (EmitContext ec)
{
if (InstanceExpression is This)
Report.Error (79, loc, "The event `{0}' can only appear on the left hand side of += or -=", GetSignatureForError ());
else
Report.Error (70, loc, "The event `{0}' can only appear on the left hand side of += or -= "+
"(except on the defining type)", Name);
}
public override string GetSignatureForError ()
{
return TypeManager.CSharpSignature (EventInfo);
}
public void EmitAddOrRemove (EmitContext ec, Expression source)
{
BinaryDelegate source_del = source as BinaryDelegate;
if (source_del == null) {
Emit (ec);
return;
}
Expression handler = source_del.Right;
Argument arg = new Argument (handler, Argument.AType.Expression);
ArrayList args = new ArrayList ();
args.Add (arg);
if (source_del.IsAddition)
Invocation.EmitCall (
ec, false, InstanceExpression, add_accessor, args, loc);
else
Invocation.EmitCall (
ec, false, InstanceExpression, remove_accessor, args, loc);
}
}
public class TemporaryVariable : Expression, IMemoryLocation
{
LocalInfo li;
Variable var;
public TemporaryVariable (Type type, Location loc)
{
this.type = type;
this.loc = loc;
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
if (li != null)
return this;
TypeExpr te = new TypeExpression (type, loc);
li = ec.CurrentBlock.AddTemporaryVariable (te, loc);
if (!li.Resolve (ec))
return null;
if (ec.MustCaptureVariable (li)) {
ScopeInfo scope = li.Block.CreateScopeInfo ();
var = scope.AddLocal (li);
type = var.Type;
}
return this;
}
public Variable Variable {
get { return var != null ? var : li.Variable; }
}
public override void Emit (EmitContext ec)
{
Variable.EmitInstance (ec);
Variable.Emit (ec);
}
public void EmitLoadAddress (EmitContext ec)
{
Variable.EmitInstance (ec);
Variable.EmitAddressOf (ec);
}
public void Store (EmitContext ec, Expression right_side)
{
Variable.EmitInstance (ec);
right_side.Emit (ec);
Variable.EmitAssign (ec);
}
public void EmitThis (EmitContext ec)
{
Variable.EmitInstance (ec);
}
public void EmitStore (EmitContext ec)
{
Variable.EmitAssign (ec);
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
EmitLoadAddress (ec);
}
}
///
/// Handles `var' contextual keyword; var becomes a keyword only
/// if no type called var exists in a variable scope
///
public class VarExpr : SimpleName
{
// Used for error reporting only
ArrayList initializer;
public VarExpr (string name, Location loc)
: base (name, loc)
{
}
public ArrayList VariableInitializer {
set {
this.initializer = value;
}
}
public override Expression DoResolveLValue (EmitContext 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 == TypeManager.anonymous_method_type) {
Report.Error (815, loc, "An implicitly typed local variable declaration cannot be initialized with `{0}'",
right_side.GetSignatureForError ());
return null;
}
eclass = ExprClass.Variable;
return this;
}
protected override void Error_TypeOrNamespaceNotFound (IResolveContext ec)
{
if (ec is FieldBase) {
Report.Error (825, loc, "The contextual keyword `var' may only appear within a local variable declaration");
return;
}
base.Error_TypeOrNamespaceNotFound (ec);
}
public override TypeExpr ResolveAsContextualType (IResolveContext rc, bool silent)
{
TypeExpr te = base.ResolveAsContextualType (rc, true);
if (te != null)
return te;
if (initializer == null)
return null;
// TODO: refactor, the error is reported too many times
if (initializer.Count > 1) {
Location loc = ((Mono.CSharp.CSharpParser.VariableDeclaration)initializer [1]).Location;
Report.Error (819, loc, "An implicitly typed local variable declaration cannot include multiple declarators");
return null;
}
Expression variable_initializer = ((Mono.CSharp.CSharpParser.VariableDeclaration)initializer [0]).expression_or_array_initializer;
if (variable_initializer == null) {
Report.Error (818, loc, "An implicitly typed local variable declarator must include an initializer");
return null;
}
return null;
}
}
}