//
// ecore.cs: Core of the Expression representation for the intermediate tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
//
// (C) 2001 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 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
///
void AddressOf (EmitContext ec);
}
///
/// Base class for expressions
///
public abstract class Expression {
public ExprClass eclass;
protected Type type;
public Type Type {
get {
return type;
}
set {
type = value;
}
}
///
/// Utility wrapper routine for Error, just to beautify the code
///
static protected void Error (int error, string s)
{
Report.Error (error, s);
}
static protected void Error (int error, Location loc, string s)
{
Report.Error (error, loc, s);
}
///
/// Utility wrapper routine for Warning, just to beautify the code
///
static protected void Warning (int warning, string s)
{
Report.Warning (warning, s);
}
static public void error30 (Location loc, Type source, Type target)
{
Report.Error (30, loc, "Cannot convert type '" +
TypeManager.CSharpName (source) + "' to '" +
TypeManager.CSharpName (target) + "'");
}
///
/// 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 DoResolve (ec);
}
///
/// 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)
{
Expression e = DoResolve (ec);
if (e != null){
if (e is SimpleName){
SimpleName s = (SimpleName) e;
Report.Error (
103, s.Location,
"The name `" + s.Name + "' could not be found in `" +
ec.TypeContainer.Name + "'");
return null;
}
if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e.GetType () +
" ExprClass is Invalid after resolve");
if (e.eclass != ExprClass.MethodGroup)
if (e.type == null)
throw new Exception (
"Expression " + e.GetType () +
" did not set its type after Resolve\n" +
"called from: " + this.GetType ());
}
return e;
}
///
/// Performs expression resolution and semantic analysis, but
/// allows SimpleNames to be returned.
///
///
///
/// This is used by MemberAccess to construct long names that can not be
/// partially resolved (namespace-qualified names for example).
///
public Expression ResolveWithSimpleName (EmitContext ec)
{
Expression e;
if (this is SimpleName)
e = ((SimpleName) this).DoResolveAllowStatic (ec);
else
e = DoResolve (ec);
if (e != null){
if (e is SimpleName)
return e;
if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e +
" ExprClass is Invalid after resolve");
if (e.eclass != ExprClass.MethodGroup)
if (e.type == null)
throw new Exception ("Expression " + e +
" did not set its type after Resolve");
}
return e;
}
///
/// 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)
{
Expression e = DoResolveLValue (ec, right_side);
if (e != null){
if (e is SimpleName){
SimpleName s = (SimpleName) e;
Report.Error (
103, s.Location,
"The name `" + s.Name + "' could not be found in `" +
ec.TypeContainer.Name + "'");
return null;
}
if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e +
" ExprClass is Invalid after resolve");
if (e.eclass != ExprClass.MethodGroup)
if (e.type == null)
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);
///
/// Protected constructor. Only derivate types should
/// be able to be created
///
protected Expression ()
{
eclass = ExprClass.Invalid;
type = null;
}
///
/// Returns a literalized version of a literal FieldInfo
///
///
///
/// The possible return values are:
/// IntConstant, UIntConstant
/// LongLiteral, ULongConstant
/// FloatConstant, DoubleConstant
/// StringConstant
///
/// The value returned is already resolved.
///
public static Constant Constantify (object v, Type t)
{
if (t == TypeManager.int32_type)
return new IntConstant ((int) v);
else if (t == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
else if (t == TypeManager.int64_type)
return new LongConstant ((long) v);
else if (t == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
else if (t == TypeManager.float_type)
return new FloatConstant ((float) v);
else if (t == TypeManager.double_type)
return new DoubleConstant ((double) v);
else if (t == TypeManager.string_type)
return new StringConstant ((string) v);
else if (t == TypeManager.short_type)
return new ShortConstant ((short)v);
else if (t == TypeManager.ushort_type)
return new UShortConstant ((ushort)v);
else if (t == TypeManager.sbyte_type)
return new SByteConstant (((sbyte)v));
else if (t == TypeManager.byte_type)
return new ByteConstant ((byte)v);
else if (t == TypeManager.char_type)
return new CharConstant ((char)v);
else if (TypeManager.IsEnumType (t)){
Expression e = Constantify (v, v.GetType ());
return new EnumConstant ((Constant) e, t);
} else
throw new Exception ("Unknown type for constant (" + t +
"), details: " + v);
}
///
/// Returns a fully formed expression after a MemberLookup
///
public static Expression ExprClassFromMemberInfo (EmitContext ec, 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 ((PropertyInfo) mi, loc);
else if (mi is Type){
return new TypeExpr ((System.Type) mi);
}
return null;
}
//
// Returns whether the array of memberinfos contains the given method
//
static bool ArrayContainsMethod (MemberInfo [] array, MethodBase new_method)
{
Type [] new_args = TypeManager.GetArgumentTypes (new_method);
foreach (MethodBase method in array){
if (method.Name != new_method.Name)
continue;
Type [] old_args = TypeManager.GetArgumentTypes (method);
int old_count = old_args.Length;
int i;
if (new_args.Length != old_count)
continue;
for (i = 0; i < old_count; i++){
if (old_args [i] != new_args [i])
break;
}
if (i != old_count)
continue;
if (!(method is MethodInfo && new_method is MethodInfo))
return true;
if (((MethodInfo) method).ReturnType == ((MethodInfo) new_method).ReturnType)
return true;
}
return false;
}
//
// We copy methods from `new_members' into `target_list' if the signature
// for the method from in the new list does not exist in the target_list
//
// The name is assumed to be the same.
//
public static ArrayList CopyNewMethods (ArrayList target_list, MemberInfo [] new_members)
{
if (target_list == null){
target_list = new ArrayList ();
target_list.AddRange (new_members);
return target_list;
}
MemberInfo [] target_array = new MemberInfo [target_list.Count];
target_list.CopyTo (target_array, 0);
foreach (MemberInfo mi in new_members){
MethodBase new_method = (MethodBase) mi;
if (!ArrayContainsMethod (target_array, new_method))
target_list.Add (new_method);
}
return target_list;
}
//
// 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 (EmitContext ec, Type t, string name,
MemberTypes mt, BindingFlags bf, Location loc)
{
Type source_type = ec.ContainerType;
if (source_type != null){
if (source_type == t || source_type.IsSubclassOf (t))
bf |= BindingFlags.NonPublic;
}
//
// Lookup for members starting in the type requested and going
// up the hierarchy until a match is found.
//
// As soon as a non-method match is found, we return.
//
// If methods are found though, then the search proceeds scanning
// for more public methods in the hierarchy with signatures that
// do not match any of the signatures found so far.
//
ArrayList method_list = null;
Type current_type = t;
bool searching = true;
do {
MemberInfo [] mi;
mi = RootContext.TypeManager.FindMembers (
current_type, mt, bf | BindingFlags.DeclaredOnly,
System.Type.FilterName, name);
if (current_type == TypeManager.object_type)
searching = false;
else {
current_type = current_type.BaseType;
//
// This happens with interfaces, they have a null
// basetype
//
if (current_type == null)
searching = false;
}
if (mi == null)
continue;
int count = mi.Length;
if (count == 0)
continue;
if (count == 1 && !(mi [0] is MethodBase))
return Expression.ExprClassFromMemberInfo (ec, mi [0], loc);
//
// We found methods, turn the search into "method scan"
// mode.
//
method_list = CopyNewMethods (method_list, mi);
mt &= (MemberTypes.Method | MemberTypes.Constructor);
} while (searching);
if (method_list != null && method_list.Count > 0)
return new MethodGroupExpr (method_list);
return null;
}
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 (EmitContext ec, Type t, string name, Location loc)
{
return MemberLookup (ec, t, name, AllMemberTypes, 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 t, string name,
Location loc)
{
Expression e;
e = MemberLookup (ec, t, name, AllMemberTypes, AllBindingFlags, loc);
if (e != null)
return e;
e = MemberLookup (ec, t, name, AllMemberTypes,
AllBindingFlags | BindingFlags.NonPublic, loc);
if (e == null){
Report.Error (
117, loc, "`" + t + "' does not contain a definition " +
"for `" + name + "'");
} else {
Report.Error (
122, loc, "`" + t + "." + name +
"' is inaccessible due to its protection level");
}
return null;
}
static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
if (target_type == TypeManager.object_type) {
//
// A pointer type cannot be converted to object
//
if (expr_type.IsPointer)
return null;
if (expr_type.IsClass)
return new EmptyCast (expr, target_type);
if (expr_type.IsValueType)
return new BoxedCast (expr);
} else if (expr_type.IsSubclassOf (target_type)) {
return new EmptyCast (expr, target_type);
} else {
// This code is kind of mirrored inside StandardConversionExists
// with the small distinction that we only probe there
//
// Always ensure that the code here and there is in sync
// from the null type to any reference-type.
if (expr is NullLiteral && !target_type.IsValueType)
return new EmptyCast (expr, target_type);
// from any class-type S to any interface-type T.
if (expr_type.IsClass && target_type.IsInterface) {
if (TypeManager.ImplementsInterface (expr_type, target_type))
return new EmptyCast (expr, target_type);
else
return null;
}
// from any interface type S to interface-type T.
if (expr_type.IsInterface && target_type.IsInterface) {
if (TypeManager.ImplementsInterface (expr_type, target_type))
return new EmptyCast (expr, target_type);
else
return null;
}
// from an array-type S to an array-type of type T
if (expr_type.IsArray && target_type.IsArray) {
if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
Type expr_element_type = expr_type.GetElementType ();
Type target_element_type = target_type.GetElementType ();
if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
if (StandardConversionExists (expr_element_type,
target_element_type))
return new EmptyCast (expr, target_type);
}
}
// from an array-type to System.Array
if (expr_type.IsArray && target_type == TypeManager.array_type)
return new EmptyCast (expr, target_type);
// from any delegate type to System.Delegate
if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
target_type == TypeManager.delegate_type)
return new EmptyCast (expr, target_type);
// from any array-type or delegate type into System.ICloneable.
if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
if (target_type == TypeManager.icloneable_type)
return new EmptyCast (expr, target_type);
return null;
}
return null;
}
///
/// Handles expressions like this: decimal d; d = 1;
/// and changes them into: decimal d; d = new System.Decimal (1);
///
static Expression InternalTypeConstructor (EmitContext ec, Expression expr, Type target)
{
ArrayList args = new ArrayList ();
args.Add (new Argument (expr, Argument.AType.Expression));
Expression ne = new New (target.FullName, args,
new Location (-1));
return ne.Resolve (ec);
}
///
/// Implicit Numeric Conversions.
///
/// expr is the expression to convert, returns a new expression of type
/// target_type or null if an implicit conversion is not possible.
///
static public Expression ImplicitNumericConversion (EmitContext ec, Expression expr,
Type target_type, Location loc)
{
Type expr_type = expr.Type;
//
// Attempt to do the implicit constant expression conversions
if (expr is IntConstant){
Expression e;
e = TryImplicitIntConversion (target_type, (IntConstant) expr);
if (e != null)
return e;
} else if (expr is LongConstant && target_type == TypeManager.uint64_type){
//
// Try the implicit constant expression conversion
// from long to ulong, instead of a nice routine,
// we just inline it
//
long v = ((LongConstant) expr).Value;
if (v > 0)
return new ULongConstant ((ulong) v);
}
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to short, int, long, float, double.
//
if (target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
if (target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (target_type == TypeManager.short_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.byte_type){
//
// From byte to short, ushort, int, uint, long, ulong, float, double
//
if ((target_type == TypeManager.short_type) ||
(target_type == TypeManager.ushort_type) ||
(target_type == TypeManager.int32_type) ||
(target_type == TypeManager.uint32_type))
return new EmptyCast (expr, target_type);
if (target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.short_type){
//
// From short to int, long, float, double
//
if (target_type == TypeManager.int32_type)
return new EmptyCast (expr, target_type);
if (target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to int, uint, long, ulong, float, double
//
if (target_type == TypeManager.uint32_type)
return new EmptyCast (expr, target_type);
if (target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
if (target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.int32_type){
//
// From int to long, float, double
//
if (target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to long, ulong, float, double
//
if (target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if ((expr_type == TypeManager.uint64_type) ||
(expr_type == TypeManager.int64_type)){
//
// From long/ulong to float, double
//
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.char_type){
//
// From char to ushort, int, uint, long, ulong, float, double
//
if ((target_type == TypeManager.ushort_type) ||
(target_type == TypeManager.int32_type) ||
(target_type == TypeManager.uint32_type))
return new EmptyCast (expr, target_type);
if (target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.float_type){
//
// float to double
//
if (target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
}
return null;
}
///
/// Determines if a standard implicit conversion exists from
/// expr_type to target_type
///
public static bool StandardConversionExists (Type expr_type, Type target_type)
{
if (expr_type == target_type)
return true;
// First numeric conversions
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to short, int, long, float, double.
//
if ((target_type == TypeManager.int32_type) ||
(target_type == TypeManager.int64_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.short_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if (expr_type == TypeManager.byte_type){
//
// From byte to short, ushort, int, uint, long, ulong, float, double
//
if ((target_type == TypeManager.short_type) ||
(target_type == TypeManager.ushort_type) ||
(target_type == TypeManager.int32_type) ||
(target_type == TypeManager.uint32_type) ||
(target_type == TypeManager.uint64_type) ||
(target_type == TypeManager.int64_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if (expr_type == TypeManager.short_type){
//
// From short to int, long, float, double
//
if ((target_type == TypeManager.int32_type) ||
(target_type == TypeManager.int64_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to int, uint, long, ulong, float, double
//
if ((target_type == TypeManager.uint32_type) ||
(target_type == TypeManager.uint64_type) ||
(target_type == TypeManager.int32_type) ||
(target_type == TypeManager.int64_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if (expr_type == TypeManager.int32_type){
//
// From int to long, float, double
//
if ((target_type == TypeManager.int64_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to long, ulong, float, double
//
if ((target_type == TypeManager.int64_type) ||
(target_type == TypeManager.uint64_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if ((expr_type == TypeManager.uint64_type) ||
(expr_type == TypeManager.int64_type)) {
//
// From long/ulong to float, double
//
if ((target_type == TypeManager.double_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if (expr_type == TypeManager.char_type){
//
// From char to ushort, int, uint, long, ulong, float, double
//
if ((target_type == TypeManager.ushort_type) ||
(target_type == TypeManager.int32_type) ||
(target_type == TypeManager.uint32_type) ||
(target_type == TypeManager.uint64_type) ||
(target_type == TypeManager.int64_type) ||
(target_type == TypeManager.float_type) ||
(target_type == TypeManager.double_type) ||
(target_type == TypeManager.decimal_type))
return true;
} else if (expr_type == TypeManager.float_type){
//
// float to double
//
if (target_type == TypeManager.double_type)
return true;
}
// Next reference conversions
if (target_type == TypeManager.object_type) {
if ((expr_type.IsClass) ||
(expr_type.IsValueType))
return true;
} else if (expr_type.IsSubclassOf (target_type)) {
return true;
} else {
// Please remember that all code below actuall comes
// from ImplicitReferenceConversion so make sure code remains in sync
// from any class-type S to any interface-type T.
if (expr_type.IsClass && target_type.IsInterface) {
if (TypeManager.ImplementsInterface (expr_type, target_type))
return true;
}
// from any interface type S to interface-type T.
// FIXME : Is it right to use IsAssignableFrom ?
if (expr_type.IsInterface && target_type.IsInterface)
if (target_type.IsAssignableFrom (expr_type))
return true;
// from an array-type S to an array-type of type T
if (expr_type.IsArray && target_type.IsArray) {
if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
Type expr_element_type = expr_type.GetElementType ();
Type target_element_type = target_type.GetElementType ();
if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
if (StandardConversionExists (expr_element_type,
target_element_type))
return true;
}
}
// from an array-type to System.Array
if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
return true;
// from any delegate type to System.Delegate
if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
target_type == TypeManager.delegate_type)
if (target_type.IsAssignableFrom (expr_type))
return true;
// from any array-type or delegate type into System.ICloneable.
if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
if (target_type == TypeManager.icloneable_type)
return true;
// from the null type to any reference-type.
// FIXME : How do we do this ?
}
return false;
}
static EmptyExpression MyEmptyExpr;
///
/// Tells whether an implicit conversion exists from expr_type to
/// target_type
///
public bool ImplicitConversionExists (EmitContext ec, Type expr_type, Type target_type,
Location l)
{
if (MyEmptyExpr == null)
MyEmptyExpr = new EmptyExpression (expr_type);
else
MyEmptyExpr.SetType (expr_type);
return ConvertImplicit (ec, MyEmptyExpr, target_type, l) != null;
}
///
/// Finds "most encompassed type" according to the spec (13.4.2)
/// amongst the methods in the MethodGroupExpr which convert from a
/// type encompassing source_type
///
static Type FindMostEncompassedType (MethodGroupExpr me, Type source_type)
{
Type best = null;
for (int i = me.Methods.Length; i > 0; ) {
i--;
MethodBase mb = me.Methods [i];
ParameterData pd = Invocation.GetParameterData (mb);
Type param_type = pd.ParameterType (0);
if (StandardConversionExists (source_type, param_type)) {
if (best == null)
best = param_type;
if (StandardConversionExists (param_type, best))
best = param_type;
}
}
return best;
}
///
/// Finds "most encompassing type" according to the spec (13.4.2)
/// amongst the methods in the MethodGroupExpr which convert to a
/// type encompassed by target_type
///
static Type FindMostEncompassingType (MethodGroupExpr me, Type target)
{
Type best = null;
for (int i = me.Methods.Length; i > 0; ) {
i--;
MethodInfo mi = (MethodInfo) me.Methods [i];
Type ret_type = mi.ReturnType;
if (StandardConversionExists (ret_type, target)) {
if (best == null)
best = ret_type;
if (!StandardConversionExists (ret_type, best))
best = ret_type;
}
}
return best;
}
///
/// User-defined Implicit conversions
///
static public Expression ImplicitUserConversion (EmitContext ec, Expression source,
Type target, Location loc)
{
return UserDefinedConversion (ec, source, target, loc, false);
}
///
/// User-defined Explicit conversions
///
static public Expression ExplicitUserConversion (EmitContext ec, Expression source,
Type target, Location loc)
{
return UserDefinedConversion (ec, source, target, loc, true);
}
///
/// User-defined conversions
///
static public Expression UserDefinedConversion (EmitContext ec, Expression source,
Type target, Location loc,
bool look_for_explicit)
{
Expression mg1 = null, mg2 = null, mg3 = null, mg4 = null;
Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
Expression e;
MethodBase method = null;
Type source_type = source.Type;
string op_name;
// If we have a boolean type, we need to check for the True operator
// FIXME : How does the False operator come into the picture ?
// FIXME : This doesn't look complete and very correct !
if (target == TypeManager.bool_type)
op_name = "op_True";
else
op_name = "op_Implicit";
mg1 = MemberLookup (ec, source_type, op_name, loc);
if (source_type.BaseType != null)
mg2 = MemberLookup (ec, source_type.BaseType, op_name, loc);
mg3 = MemberLookup (ec, target, op_name, loc);
if (target.BaseType != null)
mg4 = MemberLookup (ec, target.BaseType, op_name, loc);
MethodGroupExpr union1 = Invocation.MakeUnionSet (mg1, mg2);
MethodGroupExpr union2 = Invocation.MakeUnionSet (mg3, mg4);
MethodGroupExpr union3 = Invocation.MakeUnionSet (union1, union2);
MethodGroupExpr union4 = null;
if (look_for_explicit) {
op_name = "op_Explicit";
mg5 = MemberLookup (ec, source_type, op_name, loc);
if (source_type.BaseType != null)
mg6 = MemberLookup (ec, source_type.BaseType, op_name, loc);
mg7 = MemberLookup (ec, target, op_name, loc);
if (target.BaseType != null)
mg8 = MemberLookup (ec, target.BaseType, op_name, loc);
MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6);
MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8);
union4 = Invocation.MakeUnionSet (union5, union6);
}
MethodGroupExpr union = Invocation.MakeUnionSet (union3, union4);
if (union != null) {
Type most_specific_source, most_specific_target;
most_specific_source = FindMostEncompassedType (union, source_type);
if (most_specific_source == null)
return null;
most_specific_target = FindMostEncompassingType (union, target);
if (most_specific_target == null)
return null;
int count = 0;
for (int i = union.Methods.Length; i > 0;) {
i--;
MethodBase mb = union.Methods [i];
ParameterData pd = Invocation.GetParameterData (mb);
MethodInfo mi = (MethodInfo) union.Methods [i];
if (pd.ParameterType (0) == most_specific_source &&
mi.ReturnType == most_specific_target) {
method = mb;
count++;
}
}
if (method == null || count > 1) {
Report.Error (-11, loc, "Ambiguous user defined conversion");
return null;
}
//
// This will do the conversion to the best match that we
// found. Now we need to perform an implict standard conversion
// if the best match was not the type that we were requested
// by target.
//
if (look_for_explicit)
source = ConvertExplicitStandard (ec, source, most_specific_source, loc);
else
source = ConvertImplicitStandard (ec, source,
most_specific_source, loc);
if (source == null)
return null;
e = new UserCast ((MethodInfo) method, source);
if (e.Type != target){
if (!look_for_explicit)
e = ConvertImplicitStandard (ec, e, target, loc);
else
e = ConvertExplicitStandard (ec, e, target, loc);
return e;
} else
return e;
}
return null;
}
///
/// Converts implicitly the resolved expression `expr' into the
/// `target_type'. It returns a new expression that can be used
/// in a context that expects a `target_type'.
///
static public Expression ConvertImplicit (EmitContext ec, Expression expr,
Type target_type, Location loc)
{
Type expr_type = expr.Type;
Expression e;
if (expr_type == target_type)
return expr;
if (target_type == null)
throw new Exception ("Target type is null");
e = ConvertImplicitStandard (ec, expr, target_type, loc);
if (e != null)
return e;
e = ImplicitUserConversion (ec, expr, target_type, loc);
if (e != null)
return e;
return null;
}
///
/// Attempts to apply the `Standard Implicit
/// Conversion' rules to the expression `expr' into
/// the `target_type'. It returns a new expression
/// that can be used in a context that expects a
/// `target_type'.
///
/// This is different from `ConvertImplicit' in that the
/// user defined implicit conversions are excluded.
///
static public Expression ConvertImplicitStandard (EmitContext ec, Expression expr,
Type target_type, Location loc)
{
Type expr_type = expr.Type;
Expression e;
if (expr_type == target_type)
return expr;
e = ImplicitNumericConversion (ec, expr, target_type, loc);
if (e != null)
return e;
e = ImplicitReferenceConversion (expr, target_type);
if (e != null)
return e;
if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
IntLiteral i = (IntLiteral) expr;
if (i.Value == 0)
return new EmptyCast (expr, target_type);
}
if (ec.InUnsafe) {
if (expr_type.IsPointer){
if (target_type == TypeManager.void_ptr_type)
return new EmptyCast (expr, target_type);
//
// yep, comparing pointer types cant be done with
// t1 == t2, we have to compare their element types.
//
if (target_type.IsPointer){
if (target_type.GetElementType()==expr_type.GetElementType())
return expr;
}
}
if (target_type.IsPointer){
if (expr is NullLiteral)
return new EmptyCast (expr, target_type);
}
}
return null;
}
///
/// Attemps to perform an implict constant conversion of the IntConstant
/// into a different data type using casts (See Implicit Constant
/// Expression Conversions)
///
static protected Expression TryImplicitIntConversion (Type target_type, IntConstant ic)
{
int value = ic.Value;
//
// FIXME: This should really return constants instead of EmptyCasts
//
if (target_type == TypeManager.sbyte_type){
if (value >= SByte.MinValue && value <= SByte.MaxValue)
return new SByteConstant ((sbyte) value);
} else if (target_type == TypeManager.byte_type){
if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
return new ByteConstant ((byte) value);
} else if (target_type == TypeManager.short_type){
if (value >= Int16.MinValue && value <= Int16.MaxValue)
return new ShortConstant ((short) value);
} else if (target_type == TypeManager.ushort_type){
if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
return new UShortConstant ((ushort) value);
} else if (target_type == TypeManager.uint32_type){
if (value >= 0)
return new UIntConstant ((uint) value);
} else if (target_type == TypeManager.uint64_type){
//
// we can optimize this case: a positive int32
// always fits on a uint64. But we need an opcode
// to do it.
//
if (value >= 0)
return new ULongConstant ((ulong) value);
}
if (value == 0 && ic is IntLiteral && TypeManager.IsEnumType (target_type))
return new EnumConstant (ic, target_type);
return null;
}
///
/// Attemptes to implicityly convert `target' into `type', using
/// ConvertImplicit. If there is no implicit conversion, then
/// an error is signaled
///
static public Expression ConvertImplicitRequired (EmitContext ec, Expression source,
Type target_type, Location loc)
{
Expression e;
e = ConvertImplicit (ec, source, target_type, loc);
if (e != null)
return e;
if (source is DoubleLiteral && target_type == TypeManager.float_type){
Error (664, loc,
"Double literal cannot be implicitly converted to " +
"float type, use F suffix to create a float literal");
}
string msg = "Cannot convert implicitly from `"+
TypeManager.CSharpName (source.Type) + "' to `" +
TypeManager.CSharpName (target_type) + "'";
Error (29, loc, msg);
return null;
}
///
/// Performs the explicit numeric conversions
///
static Expression ConvertNumericExplicit (EmitContext ec, Expression expr,
Type target_type)
{
Type expr_type = expr.Type;
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to byte, ushort, uint, ulong, char
//
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I1_U1);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I1_U2);
if (target_type == TypeManager.uint32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I1_U4);
if (target_type == TypeManager.uint64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I1_U8);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I1_CH);
} else if (expr_type == TypeManager.byte_type){
//
// From byte to sbyte and char
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U1_I1);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U1_CH);
} else if (expr_type == TypeManager.short_type){
//
// From short to sbyte, byte, ushort, uint, ulong, char
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_U1);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_U2);
if (target_type == TypeManager.uint32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_U4);
if (target_type == TypeManager.uint64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_U8);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I2_CH);
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to sbyte, byte, short, char
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U2_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U2_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U2_I2);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U2_CH);
} else if (expr_type == TypeManager.int32_type){
//
// From int to sbyte, byte, short, ushort, uint, ulong, char
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_I2);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_U2);
if (target_type == TypeManager.uint32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_U4);
if (target_type == TypeManager.uint64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_U8);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I4_CH);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to sbyte, byte, short, ushort, int, char
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U4_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U4_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U4_I2);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U4_U2);
if (target_type == TypeManager.int32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U4_I4);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U4_CH);
} else if (expr_type == TypeManager.int64_type){
//
// From long to sbyte, byte, short, ushort, int, uint, ulong, char
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_I2);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_U2);
if (target_type == TypeManager.int32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_I4);
if (target_type == TypeManager.uint32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_U4);
if (target_type == TypeManager.uint64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_U8);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.I8_CH);
} else if (expr_type == TypeManager.uint64_type){
//
// From ulong to sbyte, byte, short, ushort, int, uint, long, char
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_I2);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_U2);
if (target_type == TypeManager.int32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_I4);
if (target_type == TypeManager.uint32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_U4);
if (target_type == TypeManager.int64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_I8);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.U8_CH);
} else if (expr_type == TypeManager.char_type){
//
// From char to sbyte, byte, short
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.CH_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.CH_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.CH_I2);
} else if (expr_type == TypeManager.float_type){
//
// From float to sbyte, byte, short,
// ushort, int, uint, long, ulong, char
// or decimal
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_I2);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_U2);
if (target_type == TypeManager.int32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_I4);
if (target_type == TypeManager.uint32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_U4);
if (target_type == TypeManager.int64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_I8);
if (target_type == TypeManager.uint64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_U8);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R4_CH);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.double_type){
//
// From double to byte, byte, short,
// ushort, int, uint, long, ulong,
// char, float or decimal
//
if (target_type == TypeManager.sbyte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_I1);
if (target_type == TypeManager.byte_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_U1);
if (target_type == TypeManager.short_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_I2);
if (target_type == TypeManager.ushort_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_U2);
if (target_type == TypeManager.int32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_I4);
if (target_type == TypeManager.uint32_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_U4);
if (target_type == TypeManager.int64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_I8);
if (target_type == TypeManager.uint64_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_U8);
if (target_type == TypeManager.char_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_CH);
if (target_type == TypeManager.float_type)
return new ConvCast (expr, target_type, ConvCast.Mode.R8_R4);
if (target_type == TypeManager.decimal_type)
return InternalTypeConstructor (ec, expr, target_type);
}
// decimal is taken care of by the op_Explicit methods.
return null;
}
///
/// Returns whether an explicit reference conversion can be performed
/// from source_type to target_type
///
static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
{
bool target_is_value_type = target_type.IsValueType;
if (source_type == target_type)
return true;
//
// From object to any reference type
//
if (source_type == TypeManager.object_type && !target_is_value_type)
return true;
//
// From any class S to any class-type T, provided S is a base class of T
//
if (target_type.IsSubclassOf (source_type))
return true;
//
// From any interface type S to any interface T provided S is not derived from T
//
if (source_type.IsInterface && target_type.IsInterface){
if (!target_type.IsSubclassOf (source_type))
return true;
}
//
// From any class type S to any interface T, provides S is not sealed
// and provided S does not implement T.
//
if (target_type.IsInterface && !source_type.IsSealed &&
!target_type.IsAssignableFrom (source_type))
return true;
//
// From any interface-type S to to any class type T, provided T is not
// sealed, or provided T implements S.
//
if (source_type.IsInterface &&
(!target_type.IsSealed || source_type.IsAssignableFrom (target_type)))
return true;
// From an array type S with an element type Se to an array type T with an
// element type Te provided all the following are true:
// * S and T differe only in element type, in other words, S and T
// have the same number of dimensions.
// * Both Se and Te are reference types
// * An explicit referenc conversions exist from Se to Te
//
if (source_type.IsArray && target_type.IsArray) {
if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
Type source_element_type = source_type.GetElementType ();
Type target_element_type = target_type.GetElementType ();
if (!source_element_type.IsValueType && !target_element_type.IsValueType)
if (ExplicitReferenceConversionExists (source_element_type,
target_element_type))
return true;
}
}
// From System.Array to any array-type
if (source_type == TypeManager.array_type &&
target_type.IsSubclassOf (TypeManager.array_type)){
return true;
}
//
// From System delegate to any delegate-type
//
if (source_type == TypeManager.delegate_type &&
target_type.IsSubclassOf (TypeManager.delegate_type))
return true;
//
// From ICloneable to Array or Delegate types
//
if (source_type == TypeManager.icloneable_type &&
(target_type == TypeManager.array_type ||
target_type == TypeManager.delegate_type))
return true;
return false;
}
///
/// Implements Explicit Reference conversions
///
static Expression ConvertReferenceExplicit (Expression source, Type target_type)
{
Type source_type = source.Type;
bool target_is_value_type = target_type.IsValueType;
//
// From object to any reference type
//
if (source_type == TypeManager.object_type && !target_is_value_type)
return new ClassCast (source, target_type);
//
// From any class S to any class-type T, provided S is a base class of T
//
if (target_type.IsSubclassOf (source_type))
return new ClassCast (source, target_type);
//
// From any interface type S to any interface T provided S is not derived from T
//
if (source_type.IsInterface && target_type.IsInterface){
Type [] ifaces = source_type.GetInterfaces ();
if (TypeManager.ImplementsInterface (source_type, target_type))
return null;
else
return new ClassCast (source, target_type);
}
//
// From any class type S to any interface T, provides S is not sealed
// and provided S does not implement T.
//
if (target_type.IsInterface && !source_type.IsSealed) {
if (TypeManager.ImplementsInterface (source_type, target_type))
return null;
else
return new ClassCast (source, target_type);
}
//
// From any interface-type S to to any class type T, provided T is not
// sealed, or provided T implements S.
//
if (source_type.IsInterface) {
if (target_type.IsSealed)
return null;
if (TypeManager.ImplementsInterface (target_type, source_type))
return new ClassCast (source, target_type);
else
return null;
}
// From an array type S with an element type Se to an array type T with an
// element type Te provided all the following are true:
// * S and T differe only in element type, in other words, S and T
// have the same number of dimensions.
// * Both Se and Te are reference types
// * An explicit referenc conversions exist from Se to Te
//
if (source_type.IsArray && target_type.IsArray) {
if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
Type source_element_type = source_type.GetElementType ();
Type target_element_type = target_type.GetElementType ();
if (!source_element_type.IsValueType && !target_element_type.IsValueType)
if (ExplicitReferenceConversionExists (source_element_type,
target_element_type))
return new ClassCast (source, target_type);
}
}
// From System.Array to any array-type
if (source_type == TypeManager.array_type &&
target_type.IsSubclassOf (TypeManager.array_type)){
return new ClassCast (source, target_type);
}
//
// From System delegate to any delegate-type
//
if (source_type == TypeManager.delegate_type &&
target_type.IsSubclassOf (TypeManager.delegate_type))
return new ClassCast (source, target_type);
//
// From ICloneable to Array or Delegate types
//
if (source_type == TypeManager.icloneable_type &&
(target_type == TypeManager.array_type ||
target_type == TypeManager.delegate_type))
return new ClassCast (source, target_type);
return null;
}
///
/// Performs an explicit conversion of the expression `expr' whose
/// type is expr.Type to `target_type'.
///
static public Expression ConvertExplicit (EmitContext ec, Expression expr,
Type target_type, Location loc)
{
Type expr_type = expr.Type;
Expression ne = ConvertImplicitStandard (ec, expr, target_type, loc);
if (ne != null)
return ne;
ne = ConvertNumericExplicit (ec, expr, target_type);
if (ne != null)
return ne;
//
// Unboxing conversion.
//
if (expr_type == TypeManager.object_type && target_type.IsValueType)
return new UnboxCast (expr, target_type);
//
// Enum types
//
if (expr_type.IsSubclassOf (TypeManager.enum_type)) {
Expression e;
//
// FIXME: Is there any reason we should have EnumConstant
// dealt with here instead of just using always the
// UnderlyingSystemType to wrap the type?
//
if (expr is EnumConstant)
e = ((EnumConstant) expr).Child;
else {
e = new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type));
}
e = ConvertImplicit (ec, e, target_type, loc);
if (e != null)
return e;
return ConvertNumericExplicit (ec, e, target_type);
}
ne = ConvertReferenceExplicit (expr, target_type);
if (ne != null)
return ne;
if (ec.InUnsafe){
if (target_type.IsPointer){
if (expr_type.IsPointer)
return new EmptyCast (expr, target_type);
if (expr_type == TypeManager.sbyte_type ||
expr_type == TypeManager.byte_type ||
expr_type == TypeManager.short_type ||
expr_type == TypeManager.ushort_type ||
expr_type == TypeManager.int32_type ||
expr_type == TypeManager.uint32_type ||
expr_type == TypeManager.uint64_type ||
expr_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
}
if (expr_type.IsPointer){
if (target_type == TypeManager.sbyte_type ||
target_type == TypeManager.byte_type ||
target_type == TypeManager.short_type ||
target_type == TypeManager.ushort_type ||
target_type == TypeManager.int32_type ||
target_type == TypeManager.uint32_type ||
target_type == TypeManager.uint64_type ||
target_type == TypeManager.int64_type){
Expression e = new EmptyCast (expr, TypeManager.uint32_type);
Expression ci, ce;
ci = ConvertImplicitStandard (ec, e, target_type, loc);
if (ci != null)
return ci;
ce = ConvertNumericExplicit (ec, e, target_type);
if (ce != null)
return ce;
//
// We should always be able to go from an uint32
// implicitly or explicitly to the other integral
// types
//
throw new Exception ("Internal compiler error");
}
}
}
ne = ExplicitUserConversion (ec, expr, target_type, loc);
if (ne != null)
return ne;
error30 (loc, expr_type, target_type);
return null;
}
///
/// Same as ConverExplicit, only it doesn't include user defined conversions
///
static public Expression ConvertExplicitStandard (EmitContext ec, Expression expr,
Type target_type, Location l)
{
Expression ne = ConvertImplicitStandard (ec, expr, target_type, l);
if (ne != null)
return ne;
ne = ConvertNumericExplicit (ec, expr, target_type);
if (ne != null)
return ne;
ne = ConvertReferenceExplicit (expr, target_type);
if (ne != null)
return ne;
error30 (l, expr.Type, target_type);
return null;
}
static string ExprClassName (ExprClass c)
{
switch (c){
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'
///
protected void report118 (Location loc, Expression expr, string expected)
{
string kind = "Unknown";
if (expr != null)
kind = ExprClassName (expr.eclass);
Error (118, loc, "Expression denotes a `" + kind +
"' where a `" + expected + "' was expected");
}
static void error31 (Location l, string val, Type t)
{
Report.Error (31, l, "Constant value `" + val + "' cannot be converted to " +
TypeManager.CSharpName (t));
}
public static void UnsafeError (Location loc)
{
Report.Error (214, loc, "Pointers may only be used in an unsafe context");
}
///
/// Converts the IntConstant, UIntConstant, LongConstant or
/// ULongConstant into the integral target_type. Notice
/// that we do not return an `Expression' we do return
/// a boxed integral type.
///
/// FIXME: Since I added the new constants, we need to
/// also support conversions from CharConstant, ByteConstant,
/// SByteConstant, UShortConstant, ShortConstant
///
/// This is used by the switch statement, so the domain
/// of work is restricted to the literals above, and the
/// targets are int32, uint32, char, byte, sbyte, ushort,
/// short, uint64 and int64
///
public static object ConvertIntLiteral (Constant c, Type target_type, Location loc)
{
string s = "";
if (c.Type == target_type)
return ((Constant) c).GetValue ();
//
// Make into one of the literals we handle, we dont really care
// about this value as we will just return a few limited types
//
if (c is EnumConstant)
c = ((EnumConstant)c).WidenToCompilerConstant ();
if (c is IntConstant){
int v = ((IntConstant) c).Value;
if (target_type == TypeManager.uint32_type){
if (v >= 0)
return (uint) v;
} else if (target_type == TypeManager.char_type){
if (v >= Char.MinValue && v <= Char.MaxValue)
return (char) v;
} else if (target_type == TypeManager.byte_type){
if (v >= Byte.MinValue && v <= Byte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.sbyte_type){
if (v >= SByte.MinValue && v <= SByte.MaxValue)
return (sbyte) v;
} else if (target_type == TypeManager.short_type){
if (v >= Int16.MinValue && v <= UInt16.MaxValue)
return (short) v;
} else if (target_type == TypeManager.ushort_type){
if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
return (ushort) v;
} else if (target_type == TypeManager.int64_type)
return (long) v;
else if (target_type == TypeManager.uint64_type){
if (v > 0)
return (ulong) v;
}
s = v.ToString ();
} else if (c is UIntConstant){
uint v = ((UIntConstant) c).Value;
if (target_type == TypeManager.int32_type){
if (v <= Int32.MaxValue)
return (int) v;
} else if (target_type == TypeManager.char_type){
if (v >= Char.MinValue && v <= Char.MaxValue)
return (char) v;
} else if (target_type == TypeManager.byte_type){
if (v <= Byte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.sbyte_type){
if (v <= SByte.MaxValue)
return (sbyte) v;
} else if (target_type == TypeManager.short_type){
if (v <= UInt16.MaxValue)
return (short) v;
} else if (target_type == TypeManager.ushort_type){
if (v <= UInt16.MaxValue)
return (ushort) v;
} else if (target_type == TypeManager.int64_type)
return (long) v;
else if (target_type == TypeManager.uint64_type)
return (ulong) v;
s = v.ToString ();
} else if (c is LongConstant){
long v = ((LongConstant) c).Value;
if (target_type == TypeManager.int32_type){
if (v >= UInt32.MinValue && v <= UInt32.MaxValue)
return (int) v;
} else if (target_type == TypeManager.uint32_type){
if (v >= 0 && v <= UInt32.MaxValue)
return (uint) v;
} else if (target_type == TypeManager.char_type){
if (v >= Char.MinValue && v <= Char.MaxValue)
return (char) v;
} else if (target_type == TypeManager.byte_type){
if (v >= Byte.MinValue && v <= Byte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.sbyte_type){
if (v >= SByte.MinValue && v <= SByte.MaxValue)
return (sbyte) v;
} else if (target_type == TypeManager.short_type){
if (v >= Int16.MinValue && v <= UInt16.MaxValue)
return (short) v;
} else if (target_type == TypeManager.ushort_type){
if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
return (ushort) v;
} else if (target_type == TypeManager.uint64_type){
if (v > 0)
return (ulong) v;
}
s = v.ToString ();
} else if (c is ULongConstant){
ulong v = ((ULongConstant) c).Value;
if (target_type == TypeManager.int32_type){
if (v <= Int32.MaxValue)
return (int) v;
} else if (target_type == TypeManager.uint32_type){
if (v <= UInt32.MaxValue)
return (uint) v;
} else if (target_type == TypeManager.char_type){
if (v >= Char.MinValue && v <= Char.MaxValue)
return (char) v;
} else if (target_type == TypeManager.byte_type){
if (v >= Byte.MinValue && v <= Byte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.sbyte_type){
if (v <= (int) SByte.MaxValue)
return (sbyte) v;
} else if (target_type == TypeManager.short_type){
if (v <= UInt16.MaxValue)
return (short) v;
} else if (target_type == TypeManager.ushort_type){
if (v <= UInt16.MaxValue)
return (ushort) v;
} else if (target_type == TypeManager.int64_type){
if (v <= Int64.MaxValue)
return (long) v;
}
s = v.ToString ();
} else if (c is ByteConstant){
byte v = ((ByteConstant) c).Value;
if (target_type == TypeManager.int32_type)
return (int) v;
else if (target_type == TypeManager.uint32_type)
return (uint) v;
else if (target_type == TypeManager.char_type)
return (char) v;
else if (target_type == TypeManager.sbyte_type){
if (v <= SByte.MaxValue)
return (sbyte) v;
} else if (target_type == TypeManager.short_type)
return (short) v;
else if (target_type == TypeManager.ushort_type)
return (ushort) v;
else if (target_type == TypeManager.int64_type)
return (long) v;
else if (target_type == TypeManager.uint64_type)
return (ulong) v;
s = v.ToString ();
} else if (c is SByteConstant){
sbyte v = ((SByteConstant) c).Value;
if (target_type == TypeManager.int32_type)
return (int) v;
else if (target_type == TypeManager.uint32_type){
if (v >= 0)
return (uint) v;
} else if (target_type == TypeManager.char_type){
if (v >= 0)
return (char) v;
} else if (target_type == TypeManager.byte_type){
if (v >= 0)
return (byte) v;
} else if (target_type == TypeManager.short_type)
return (short) v;
else if (target_type == TypeManager.ushort_type){
if (v >= 0)
return (ushort) v;
} else if (target_type == TypeManager.int64_type)
return (long) v;
else if (target_type == TypeManager.uint64_type){
if (v >= 0)
return (ulong) v;
}
s = v.ToString ();
} else if (c is ShortConstant){
short v = ((ShortConstant) c).Value;
if (target_type == TypeManager.int32_type){
return (int) v;
} else if (target_type == TypeManager.uint32_type){
if (v >= 0)
return (uint) v;
} else if (target_type == TypeManager.char_type){
if (v >= 0)
return (char) v;
} else if (target_type == TypeManager.byte_type){
if (v >= Byte.MinValue && v <= Byte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.sbyte_type){
if (v >= SByte.MinValue && v <= SByte.MaxValue)
return (sbyte) v;
} else if (target_type == TypeManager.ushort_type){
if (v >= 0)
return (ushort) v;
} else if (target_type == TypeManager.int64_type)
return (long) v;
else if (target_type == TypeManager.uint64_type)
return (ulong) v;
s = v.ToString ();
} else if (c is UShortConstant){
ushort v = ((UShortConstant) c).Value;
if (target_type == TypeManager.int32_type)
return (int) v;
else if (target_type == TypeManager.uint32_type)
return (uint) v;
else if (target_type == TypeManager.char_type){
if (v >= Char.MinValue && v <= Char.MaxValue)
return (char) v;
} else if (target_type == TypeManager.byte_type){
if (v >= Byte.MinValue && v <= Byte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.sbyte_type){
if (v <= SByte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.short_type){
if (v <= Int16.MaxValue)
return (short) v;
} else if (target_type == TypeManager.int64_type)
return (long) v;
else if (target_type == TypeManager.uint64_type)
return (ulong) v;
s = v.ToString ();
} else if (c is CharConstant){
char v = ((CharConstant) c).Value;
if (target_type == TypeManager.int32_type)
return (int) v;
else if (target_type == TypeManager.uint32_type)
return (uint) v;
else if (target_type == TypeManager.byte_type){
if (v >= Byte.MinValue && v <= Byte.MaxValue)
return (byte) v;
} else if (target_type == TypeManager.sbyte_type){
if (v <= SByte.MaxValue)
return (sbyte) v;
} else if (target_type == TypeManager.short_type){
if (v <= Int16.MaxValue)
return (short) v;
} else if (target_type == TypeManager.ushort_type)
return (short) v;
else if (target_type == TypeManager.int64_type)
return (long) v;
else if (target_type == TypeManager.uint64_type)
return (ulong) v;
s = v.ToString ();
}
error31 (loc, s, target_type);
return null;
}
//
// Load the object from the pointer. The `IsReference' is used
// to control whether we should use Ldind_Ref or LdObj if the
// value is not a `core' type.
//
// Maybe we should try to extract this infromation form the type?
// TODO: Maybe this is a bug. The reason we have this flag is because
// I had almost identical code in ParameterReference (for handling
// references) and in UnboxCast.
//
public static void LoadFromPtr (ILGenerator ig, Type t, bool IsReference)
{
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)){
LoadFromPtr (ig, TypeManager.EnumToUnderlying (t), IsReference);
} else {
if (IsReference)
ig.Emit (OpCodes.Ldind_Ref);
else
ig.Emit (OpCodes.Ldobj, t);
}
}
//
// The stack contains the pointer and the value of type `type'
//
public static void StoreFromPtr (ILGenerator ig, Type 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
ig.Emit (OpCodes.Stind_Ref);
}
//
// Returns the size of type `t' if known, otherwise, 0
//
public static int GetTypeSize (Type 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
return 0;
}
}
///
/// 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 {
///
/// 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;
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);
}
}
///
/// 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)
{
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 object GetValue ()
{
return Child.GetValue ();
}
//
// Converts from one of the valid underlying types for an enumeration
// (int32, uint32, int64, uint64, short, ushort, byte, sbyte) to
// one of the internal compiler literals: Int/UInt/Long/ULong Literals.
//
public Constant WidenToCompilerConstant ()
{
Type t = TypeManager.EnumToUnderlying (Child.Type);
object v = ((Constant) Child).GetValue ();;
if (t == TypeManager.int32_type)
return new IntConstant ((int) v);
if (t == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (t == TypeManager.int64_type)
return new LongConstant ((long) v);
if (t == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (t == TypeManager.short_type)
return new ShortConstant ((short) v);
if (t == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (t == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (t == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
throw new Exception ("Invalid enumeration underlying type: " + t);
}
//
// Extracts the value in the enumeration on its native representation
//
public object GetPlainValue ()
{
Type t = TypeManager.EnumToUnderlying (Child.Type);
object v = ((Constant) Child).GetValue ();;
if (t == TypeManager.int32_type)
return (int) v;
if (t == TypeManager.uint32_type)
return (uint) v;
if (t == TypeManager.int64_type)
return (long) v;
if (t == TypeManager.uint64_type)
return (ulong) v;
if (t == TypeManager.short_type)
return (short) v;
if (t == TypeManager.ushort_type)
return (ushort) v;
if (t == TypeManager.byte_type)
return (byte) v;
if (t == TypeManager.sbyte_type)
return (sbyte) v;
return null;
}
public override string AsString ()
{
return Child.AsString ();
}
}
///
/// 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)
: base (expr, TypeManager.object_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);
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 void Emit (EmitContext ec)
{
Type t = type;
ILGenerator ig = ec.ig;
base.Emit (ec);
ig.Emit (OpCodes.Unbox, t);
LoadFromPtr (ig, t, false);
}
}
///
/// 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 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);
ec.ig.Emit (OpCodes.Castclass, type);
}
}
///
/// SimpleName expressions are initially formed of a single
/// word and it only happens at the beginning of the expression.
///
///
///
/// The expression will try to be bound to a Field, a Method
/// group or a Property. If those fail we pass the name to our
/// caller and the SimpleName is compounded to perform a type
/// lookup. The idea behind this process is that we want to avoid
/// creating a namespace map from the assemblies, as that requires
/// the GetExportedTypes function to be called and a hashtable to
/// be constructed which reduces startup time. If later we find
/// that this is slower, we should create a `NamespaceExpr' expression
/// that fully participates in the resolution process.
///
/// For example `System.Console.WriteLine' is decomposed into
/// MemberAccess (MemberAccess (SimpleName ("System"), "Console"), "WriteLine")
///
/// The first SimpleName wont produce a match on its own, so it will
/// be turned into:
/// MemberAccess (SimpleName ("System.Console"), "WriteLine").
///
/// System.Console will produce a TypeExpr match.
///
/// The downside of this is that we might be hitting `LookupType' too many
/// times with this scheme.
///
public class SimpleName : Expression {
public readonly string Name;
public readonly Location Location;
public SimpleName (string name, Location l)
{
Name = name;
Location = l;
}
public static void Error120 (Location l, string name)
{
Report.Error (
120, l,
"An object reference is required " +
"for the non-static field `"+name+"'");
}
//
// Checks whether we are trying to access an instance
// property, method or field from a static body.
//
Expression MemberStaticCheck (Expression e)
{
if (e is FieldExpr){
FieldInfo fi = ((FieldExpr) e).FieldInfo;
if (!fi.IsStatic){
Error120 (Location, Name);
return null;
}
} else if (e is MethodGroupExpr){
MethodGroupExpr mg = (MethodGroupExpr) e;
if (!mg.RemoveInstanceMethods ()){
Error120 (Location, mg.Methods [0].Name);
return null;
}
return e;
} else if (e is PropertyExpr){
if (!((PropertyExpr) e).IsStatic){
Error120 (Location, Name);
return null;
}
} else if (e is EventExpr) {
if (!((EventExpr) e).IsStatic) {
Error120 (Location, Name);
return null;
}
}
return e;
}
public override Expression DoResolve (EmitContext ec)
{
return SimpleNameResolve (ec, false);
}
public Expression DoResolveAllowStatic (EmitContext ec)
{
return SimpleNameResolve (ec, true);
}
///
/// 7.5.2: Simple Names.
///
/// Local Variables and Parameters are handled at
/// parse time, so they never occur as SimpleNames.
///
/// The `allow_static' 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 SimpleNameResolve (EmitContext ec, bool allow_static)
{
Expression e;
//
// Stage 1: Performed by the parser (binding to locals or parameters).
//
//
// Stage 2: Lookup members
//
e = MemberLookup (ec, ec.TypeContainer.TypeBuilder, Name, Location);
if (e == null){
//
// Stage 3: Lookup symbol in the various namespaces.
//
DeclSpace ds = ec.TypeContainer;
Type t;
string alias_value;
if ((t = RootContext.LookupType (ds, Name, true, Location)) != null)
return new TypeExpr (t);
//
// Stage 2 part b: Lookup up if we are an alias to a type
// or a namespace.
//
// Since we are cheating: we only do the Alias lookup for
// namespaces if the name does not include any dots in it
//
if (Name.IndexOf ('.') == -1 && (alias_value = ec.TypeContainer.LookupAlias (Name)) != null) {
// System.Console.WriteLine (Name + " --> " + alias_value);
if ((t = RootContext.LookupType (ds, alias_value, true, Location))
!= null)
return new TypeExpr (t);
// we have alias value, but it isn't Type, so try if it's namespace
return new SimpleName (alias_value, Location);
}
// No match, maybe our parent can compose us
// into something meaningful.
return this;
}
//
// Stage 2 continues here.
//
if (e is TypeExpr)
return e;
if (e is FieldExpr){
FieldExpr fe = (FieldExpr) e;
FieldInfo fi = fe.FieldInfo;
if (fi.FieldType.IsPointer && !ec.InUnsafe){
UnsafeError (Location);
}
if (ec.IsStatic){
if (!allow_static && !fi.IsStatic){
Error120 (Location, Name);
return null;
}
} else {
// If we are not in static code and this
// field is not static, set the instance to `this'.
if (!fi.IsStatic)
fe.InstanceExpression = ec.This;
}
if (fi is FieldBuilder) {
Const c = TypeManager.LookupConstant ((FieldBuilder) fi);
if (c != null) {
object o = c.LookupConstantValue (ec);
object real_value = ((Constant)c.Expr).GetValue ();
return Constantify (real_value, fi.FieldType);
}
}
return e;
}
if (e is EventExpr) {
//
// If the event is local to this class, we transform ourselves into
// a FieldExpr
//
EventExpr ee = (EventExpr) e;
Expression ml = MemberLookup (
ec, ec.TypeContainer.TypeBuilder, ee.EventInfo.Name,
MemberTypes.Event, AllBindingFlags, Location);
if (ml != null) {
MemberInfo mi = ec.TypeContainer.GetFieldFromEvent ((EventExpr) ml);
if (mi == null) {
//
// If this happens, then we have an event with its own
// accessors and private field etc so there's no need
// to transform ourselves : we should instead flag an error
//
Assign.error70 (ee.EventInfo, Location);
return null;
}
ml = ExprClassFromMemberInfo (ec, mi, Location);
if (ml == null) {
Report.Error (-200, Location, "Internal error!!");
return null;
}
Expression instance_expr;
FieldInfo fi = ((FieldExpr) ml).FieldInfo;
if (fi.IsStatic)
instance_expr = null;
else
instance_expr = ec.This;
instance_expr = instance_expr.Resolve (ec);
if (instance_expr != null)
instance_expr = instance_expr.Resolve (ec);
return MemberAccess.ResolveMemberAccess (ec, ml, instance_expr, Location, null);
}
}
if (ec.IsStatic){
if (allow_static)
return e;
return MemberStaticCheck (e);
} else
return e;
}
public override void Emit (EmitContext ec)
{
//
// If this is ever reached, then we failed to
// find the name as a namespace
//
Error (103, Location, "The name `" + Name +
"' does not exist in the class `" +
ec.TypeContainer.Name + "'");
}
}
///
/// Fully resolved expression that evaluates to a type
///
public class TypeExpr : Expression {
public TypeExpr (Type t)
{
Type = t;
eclass = ExprClass.Type;
}
override public Expression DoResolve (EmitContext ec)
{
return this;
}
override public void Emit (EmitContext ec)
{
throw new Exception ("Implement me");
}
}
///
/// MethodGroup Expression.
///
/// This is a fully resolved expression that evaluates to a type
///
public class MethodGroupExpr : Expression {
public MethodBase [] Methods;
Expression instance_expression = null;
public MethodGroupExpr (MemberInfo [] mi)
{
Methods = new MethodBase [mi.Length];
mi.CopyTo (Methods, 0);
eclass = ExprClass.MethodGroup;
}
public MethodGroupExpr (ArrayList l)
{
Methods = new MethodBase [l.Count];
l.CopyTo (Methods, 0);
eclass = ExprClass.MethodGroup;
}
//
// `A method group may have associated an instance expression'
//
public Expression InstanceExpression {
get {
return instance_expression;
}
set {
instance_expression = value;
}
}
override public Expression DoResolve (EmitContext ec)
{
return this;
}
override public void Emit (EmitContext ec)
{
throw new Exception ("This should never be reached");
}
bool RemoveMethods (bool keep_static)
{
ArrayList smethods = new ArrayList ();
int top = Methods.Length;
int i;
for (i = 0; i < top; i++){
MethodBase mb = Methods [i];
if (mb.IsStatic == keep_static)
smethods.Add (mb);
}
if (smethods.Count == 0)
return false;
Methods = new MethodBase [smethods.Count];
smethods.CopyTo (Methods, 0);
return true;
}
///
/// Removes any instance methods from the MethodGroup, returns
/// false if the resulting set is empty.
///
public bool RemoveInstanceMethods ()
{
return RemoveMethods (true);
}
///
/// Removes any static methods from the MethodGroup, returns
/// false if the resulting set is empty.
///
public bool RemoveStaticMethods ()
{
return RemoveMethods (false);
}
}
///
/// Fully resolved expression that evaluates to a Field
///
public class FieldExpr : Expression, IAssignMethod, IMemoryLocation {
public readonly FieldInfo FieldInfo;
public Expression InstanceExpression;
Location loc;
public FieldExpr (FieldInfo fi, Location l)
{
FieldInfo = fi;
eclass = ExprClass.Variable;
type = fi.FieldType;
loc = l;
}
override public Expression DoResolve (EmitContext ec)
{
if (!FieldInfo.IsStatic){
if (InstanceExpression == null){
throw new Exception ("non-static FieldExpr without instance var\n" +
"You have to assign the Instance variable\n" +
"Of the FieldExpr to set this\n");
}
InstanceExpression = InstanceExpression.Resolve (ec);
if (InstanceExpression == null)
return null;
}
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
Expression e = DoResolve (ec);
if (e == null)
return null;
if (!FieldInfo.IsInitOnly)
return this;
//
// InitOnly fields can only be assigned in constructors
//
if (ec.IsConstructor)
return this;
Report.Error (191, loc,
"Readonly field can not be assigned outside " +
"of constructor or variable initializer");
return null;
}
override public void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
bool is_volatile = false;
if (FieldInfo is FieldBuilder){
Field f = TypeManager.GetField (FieldInfo);
if (f != null && (f.ModFlags & Modifiers.VOLATILE) != 0)
is_volatile = true;
f.status |= Field.Status.USED;
}
if (FieldInfo.IsStatic){
if (is_volatile)
ig.Emit (OpCodes.Volatile);
ig.Emit (OpCodes.Ldsfld, FieldInfo);
} else {
if (InstanceExpression.Type.IsValueType){
IMemoryLocation ml;
LocalTemporary tempo = null;
if (!(InstanceExpression is IMemoryLocation)){
tempo = new LocalTemporary (
ec, InstanceExpression.Type);
InstanceExpression.Emit (ec);
tempo.Store (ec);
ml = tempo;
} else
ml = (IMemoryLocation) InstanceExpression;
ml.AddressOf (ec);
} else
InstanceExpression.Emit (ec);
if (is_volatile)
ig.Emit (OpCodes.Volatile);
ig.Emit (OpCodes.Ldfld, FieldInfo);
}
}
public void EmitAssign (EmitContext ec, Expression source)
{
bool is_static = FieldInfo.IsStatic;
ILGenerator ig = ec.ig;
if (!is_static){
Expression instance = InstanceExpression;
if (instance.Type.IsValueType){
if (instance is IMemoryLocation){
IMemoryLocation ml = (IMemoryLocation) instance;
ml.AddressOf (ec);
} else
throw new Exception ("The " + instance + " of type " +
instance.Type +
" represents a ValueType and does " +
"not implement IMemoryLocation");
} else
instance.Emit (ec);
}
source.Emit (ec);
if (FieldInfo is FieldBuilder){
Field f = TypeManager.GetField (FieldInfo);
if (f != null && (f.ModFlags & Modifiers.VOLATILE) != 0)
ig.Emit (OpCodes.Volatile);
}
if (is_static)
ig.Emit (OpCodes.Stsfld, FieldInfo);
else
ig.Emit (OpCodes.Stfld, FieldInfo);
if (FieldInfo is FieldBuilder){
Field f = TypeManager.GetField (FieldInfo);
f.status |= Field.Status.ASSIGNED;
}
}
public void AddressOf (EmitContext ec)
{
ILGenerator ig = ec.ig;
if (FieldInfo is FieldBuilder){
Field f = TypeManager.GetField (FieldInfo);
if (f != null && (f.ModFlags & Modifiers.VOLATILE) != 0)
ig.Emit (OpCodes.Volatile);
}
//
// FIXME:
//
// Mhm. We do not know what we are being used for:
// READING or WRITING the field.
//
// I think we want an extra argument to AddressOf to pass
// this semantic information.
//
// For now: just flag both assigned and used.
//
if (FieldInfo is FieldBuilder){
Field f = TypeManager.GetField (FieldInfo);
f.status |= Field.Status.ASSIGNED | Field.Status.USED;
}
//
// Handle initonly fields specially: make a copy and then
// get the address of the copy.
//
if (FieldInfo.IsInitOnly){
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 {
InstanceExpression.Emit (ec);
ig.Emit (OpCodes.Ldflda, FieldInfo);
}
}
}
///
/// 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 : ExpressionStatement, IAssignMethod {
public readonly PropertyInfo PropertyInfo;
public readonly bool IsStatic;
public bool IsBase;
MethodInfo [] Accessors;
Location loc;
Expression instance_expr;
public PropertyExpr (PropertyInfo pi, Location l)
{
PropertyInfo = pi;
eclass = ExprClass.PropertyAccess;
IsStatic = false;
loc = l;
Accessors = TypeManager.GetAccessors (pi);
if (Accessors != null)
for (int i = 0; i < Accessors.Length; i++){
if (Accessors [i] != null)
if (Accessors [i].IsStatic)
IsStatic = true;
}
else
Accessors = new MethodInfo [2];
type = pi.PropertyType;
}
//
// The instance expression associated with this expression
//
public Expression InstanceExpression {
set {
instance_expr = value;
}
get {
return instance_expr;
}
}
public bool VerifyAssignable ()
{
if (!PropertyInfo.CanWrite){
Report.Error (200, loc,
"The property `" + PropertyInfo.Name +
"' can not be assigned to, as it has not set accessor");
return false;
}
return true;
}
override public Expression DoResolve (EmitContext ec)
{
if (!PropertyInfo.CanRead){
Report.Error (154, loc,
"The property `" + PropertyInfo.Name +
"' can not be used in " +
"this context because it lacks a get accessor");
return null;
}
type = PropertyInfo.PropertyType;
return this;
}
override public void Emit (EmitContext ec)
{
Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, Accessors [0], null);
}
//
// Implements the IAssignMethod interface for assignments
//
public void EmitAssign (EmitContext ec, Expression source)
{
Argument arg = new Argument (source, Argument.AType.Expression);
ArrayList args = new ArrayList ();
args.Add (arg);
Invocation.EmitCall (ec, false, IsStatic, instance_expr, Accessors [1], args);
}
override public void EmitStatement (EmitContext ec)
{
Emit (ec);
ec.ig.Emit (OpCodes.Pop);
}
}
///
/// Fully resolved expression that evaluates to an Event
///
public class EventExpr : Expression {
public readonly EventInfo EventInfo;
Location loc;
public Expression InstanceExpression;
public readonly bool IsStatic;
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)
IsStatic = true;
if (EventInfo is MyEventBuilder)
type = ((MyEventBuilder) EventInfo).EventType;
else
type = EventInfo.EventHandlerType;
}
override public Expression DoResolve (EmitContext ec)
{
// We are born fully resolved
return this;
}
override public void Emit (EmitContext ec)
{
throw new Exception ("Should not happen I think");
}
public void EmitAddOrRemove (EmitContext ec, Expression source)
{
Expression handler = ((Binary) source).Right;
Argument arg = new Argument (handler, Argument.AType.Expression);
ArrayList args = new ArrayList ();
args.Add (arg);
if (((Binary) source).Oper == Binary.Operator.Addition)
Invocation.EmitCall (
ec, false, IsStatic, InstanceExpression, add_accessor, args);
else
Invocation.EmitCall (
ec, false, IsStatic, InstanceExpression, remove_accessor, args);
}
}
}