//
// ecore.cs: Core of the Expression representation for the intermediate tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
//
// (C) 2001 Ximian, Inc.
//
//
namespace Mono.MonoBASIC {
using System;
using System.Collections;
using System.Diagnostics;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
///
/// The ExprClass class contains the is used to pass the
/// classification of an expression (value, variable, namespace,
/// type, method group, property access, event access, indexer access,
/// nothing).
///
public enum ExprClass : byte {
Invalid,
Value,
Variable,
Namespace,
Type,
MethodGroup,
PropertyAccess,
EventAccess,
IndexerAccess,
Nothing,
}
///
/// This is used to tell Resolve in which types of expressions we're
/// interested.
///
[Flags]
public enum ResolveFlags {
// Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
VariableOrValue = 1,
// Returns a type expression.
Type = 2,
// Returns a method group.
MethodGroup = 4,
// 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).
SimpleName = 8,
// Mask of all the expression class flags.
MaskExprClass = 15,
// Disable control flow analysis while resolving the expression.
// This is used when resolving the instance expression of a field expression.
DisableFlowAnalysis = 16
}
//
// This is just as a hint to AddressOf of what will be done with the
// address.
[Flags]
public enum AddressOp {
Store = 1,
Load = 2,
LoadStore = 3
};
///
/// This interface is implemented by variables
///
public interface IMemoryLocation {
///
/// The AddressOf method should generate code that loads
/// the address of the object and leaves it on the stack.
///
/// The 'mode' argument is used to notify the expression
/// of whether this will be used to read from the address or
/// write to the address.
///
/// This is just a hint that can be used to provide good error
/// reporting, and should have no other side effects.
///
void AddressOf (EmitContext ec, AddressOp mode);
}
///
/// This interface is implemented by variables
///
public interface IVariable {
///
/// Checks whether the variable has already been assigned at
/// the current position of the method's control flow and
/// reports an appropriate error message if not.
///
/// If the variable is a struct, then this call checks whether
/// all of its fields (including all private ones) have been
/// assigned.
///
bool IsAssigned (EmitContext ec, Location loc);
///
/// Checks whether field 'name' in this struct has been assigned.
///
bool IsFieldAssigned (EmitContext ec, string name, Location loc);
///
/// Tells the flow analysis code that the variable has already
/// been assigned at the current code position.
///
/// If the variable is a struct, this call marks all its fields
/// (including private fields) as being assigned.
///
void SetAssigned (EmitContext ec);
///
/// Tells the flow analysis code that field 'name' in this struct
/// has already been assigned atthe current code position.
///
void SetFieldAssigned (EmitContext ec, string name);
}
///
/// This interface denotes an expression which evaluates to a member
/// of a struct or a class.
///
public interface IMemberExpr
{
///
/// The name of this member.
///
string Name {
get;
}
///
/// Whether this is an instance member.
///
bool IsInstance {
get;
}
///
/// Whether this is a static member.
///
bool IsStatic {
get;
}
///
/// The type which declares this member.
///
Type DeclaringType {
get;
}
///
/// The instance expression associated with this member, if it's a
/// non-static member.
///
Expression InstanceExpression {
get; set;
}
}
///
/// Expression which resolves to a type.
///
public interface ITypeExpression
{
///
/// Resolve the expression, but only lookup types.
///
Expression DoResolveType (EmitContext ec);
}
///
/// Base class for expressions
///
public abstract class Expression {
public ExprClass eclass;
protected Type type;
protected Location loc;
public Type Type {
get {
return type;
}
set {
type = value;
}
}
public Location Location {
get {
return loc;
}
}
///
/// Utility wrapper routine for Error, just to beautify the code
///
public void Error (int error, string s)
{
if (!Location.IsNull (loc))
Report.Error (error, loc, s);
else
Report.Error (error, s);
}
///
/// Utility wrapper routine for Warning, just to beautify the code
///
public void Warning (int warning, string s)
{
if (!Location.IsNull (loc))
Report.Warning (warning, loc, s);
else
Report.Warning (warning, s);
}
///
/// Utility wrapper routine for Warning, only prints the warning if
/// warnings of level 'level' are enabled.
///
public void Warning (int warning, int level, string s)
{
if (level <= RootContext.WarningLevel)
Warning (warning, s);
}
static public void Error_CannotConvertType (Location loc, Type source, Type target)
{
Report.Error (30, loc, "Cannot convert type '" +
TypeManager.MonoBASIC_Name (source) + "' to '" +
TypeManager.MonoBASIC_Name (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, ResolveFlags flags)
{
// Are we doing a types-only search ?
if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type) {
ITypeExpression type_expr = this as ITypeExpression;
if (type_expr == null)
return null;
return type_expr.DoResolveType (ec);
}
bool old_do_flow_analysis = ec.DoFlowAnalysis;
if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
ec.DoFlowAnalysis = false;
Expression e;
try {
if (this is SimpleName)
e = ((SimpleName) this).DoResolveAllowStatic (ec);
else
e = DoResolve (ec);
} finally {
ec.DoFlowAnalysis = old_do_flow_analysis;
}
if (e == null)
return null;
if (e is SimpleName){
SimpleName s = (SimpleName) e;
if ((flags & ResolveFlags.SimpleName) == 0) {
object lookup = TypeManager.MemberLookup (
ec.ContainerType, ec.ContainerType, AllMemberTypes,
AllBindingFlags | BindingFlags.NonPublic, s.Name);
if (lookup != null)
Error (30390, "'" + s.Name + "' " +
"is inaccessible because of its protection level");
else
Error (30451, "The name '" + s.Name + "' could not be " +
"found in '" + ec.DeclSpace.Name + "'");
return null;
}
return s;
}
if ((e is TypeExpr) || (e is ComposedCast)) {
if ((flags & ResolveFlags.Type) == 0) {
e.Error118 (flags);
return null;
}
return e;
}
switch (e.eclass) {
case ExprClass.Type:
if ((flags & ResolveFlags.VariableOrValue) == 0) {
e.Error118 (flags);
return null;
}
break;
case ExprClass.MethodGroup:
if ((flags & ResolveFlags.MethodGroup) == 0) {
MethodGroupExpr mg = (MethodGroupExpr) e;
Invocation i = new Invocation (mg, new ArrayList(), Location.Null);
Expression te = i.Resolve(ec);
//((MethodGroupExpr) e).ReportUsageError ();
//return null;
return te;
}
break;
case ExprClass.Value:
case ExprClass.Variable:
case ExprClass.PropertyAccess:
case ExprClass.EventAccess:
case ExprClass.IndexerAccess:
if ((flags & ResolveFlags.VariableOrValue) == 0) {
e.Error118 (flags);
return null;
}
break;
default:
throw new Exception ("Expression " + e.GetType () +
" ExprClass is Invalid after resolve");
}
if (e.type == null)
throw new Exception (
"Expression " + e.GetType () +
" did not set its type after Resolve\n" +
"called from: " + this.GetType ());
return e;
}
///
/// Resolves an expression and performs semantic analysis on it.
///
public Expression Resolve (EmitContext ec)
{
return Resolve (ec, ResolveFlags.VariableOrValue);
}
///
/// 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 (
30451, loc,
"The name '" + s.Name + "' could not be found in '" +
ec.DeclSpace.Name + "'");
return null;
}
if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e +
" ExprClass is Invalid after resolve");
if (e.eclass == ExprClass.MethodGroup) {
MethodGroupExpr mg = (MethodGroupExpr) e;
Invocation i = new Invocation (mg, new ArrayList(), Location.Null);
Expression te = i.Resolve(ec);
return te;
//((MethodGroupExpr) e).ReportUsageError ();
//return null;
}
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 (t == TypeManager.bool_type)
return new BoolConstant ((bool) v);
else if (TypeManager.IsEnumType (t)){
Constant e = Constantify (v, TypeManager.TypeToCoreType (v.GetType ()));
return new EnumConstant (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 (ec, (PropertyInfo) mi, loc);
else if (mi is Type){
return new TypeExpr ((System.Type) mi, loc);
}
return null;
}
//
// 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)
{
return MemberLookup (ec, ec.ContainerType, t, name, mt, bf, loc);
}
//
// Lookup type 't' for code in class 'invocation_type'. Note that it's important
// to set 'invocation_type' correctly since this method also checks whether the
// invoking class is allowed to access the member in class 't'. When you want to
// explicitly do a lookup in the base class, you must set both 't' and 'invocation_type'
// to the base class (although a derived class can access protected members of its base
// class it cannot do so through an instance of the base class (error CS1540)).
//
public static Expression MemberLookup (EmitContext ec, Type invocation_type, Type t,
string name, MemberTypes mt, BindingFlags bf,
Location loc)
{
MemberInfo [] mi = TypeManager.MemberLookup (invocation_type, t, mt, bf, name);
if (mi == null)
return null;
int count = mi.Length;
if (count > 1)
return new MethodGroupExpr (mi, loc);
if (mi [0] is MethodBase)
return new MethodGroupExpr (mi, loc);
return ExprClassFromMemberInfo (ec, mi [0], loc);
}
public const MemberTypes AllMemberTypes =
MemberTypes.Constructor |
MemberTypes.Event |
MemberTypes.Field |
MemberTypes.Method |
MemberTypes.NestedType |
MemberTypes.Property;
public const BindingFlags AllBindingFlags =
BindingFlags.Public |
BindingFlags.Static |
BindingFlags.Instance |
BindingFlags.IgnoreCase;
public static Expression MemberLookup (EmitContext ec, Type t, string name, Location loc)
{
return MemberLookup (ec, ec.ContainerType, t, name, AllMemberTypes, AllBindingFlags, loc);
}
public static Expression MethodLookup (EmitContext ec, Type t, string name, Location loc)
{
return MemberLookup (ec, ec.ContainerType, t, name,
MemberTypes.Method, AllBindingFlags, loc);
}
///
/// This is a wrapper for MemberLookup that is not used to "probe", but
/// to find a final definition. If the final definition is not found, we
/// look for private members and display a useful debugging message if we
/// find it.
///
public static Expression MemberLookupFinal (EmitContext ec, Type t, string name,
Location loc)
{
return MemberLookupFinal (ec, t, name, MemberTypes.Method, AllBindingFlags, loc);
}
public static Expression MemberLookupFinal (EmitContext ec, Type t, string name,
MemberTypes mt, BindingFlags bf, Location loc)
{
Expression e;
int errors = Report.Errors;
e = MemberLookup (ec, ec.ContainerType, t, name, mt, bf, loc);
if (e != null)
return e;
// Error has already been reported.
if (errors < Report.Errors)
return null;
e = MemberLookup (ec, t, name, AllMemberTypes,
AllBindingFlags | BindingFlags.NonPublic, loc);
if (e == null){
Report.Error (
30456, loc, "'" + t + "' does not contain a definition " +
"for '" + name + "'");
} else {
Report.Error (
30390, loc, "'" + t + "." + name +
"' is inaccessible due to its protection level");
}
return null;
}
static public MemberInfo GetFieldFromEvent (EventExpr event_expr)
{
EventInfo ei = event_expr.EventInfo;
return TypeManager.GetPrivateFieldOfEvent (ei);
}
static EmptyExpression MyEmptyExpr;
static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
if (expr_type == null && expr.eclass == ExprClass.MethodGroup){
// if we are a method group, emit a warning
expr.Emit (null);
}
//
// notice that it is possible to write "ValueType v = 1", the ValueType here
// is an abstract class, and not really a value type, so we apply the same rules.
//
if (target_type == TypeManager.object_type || target_type == TypeManager.value_type) {
//
// A pointer type cannot be converted to object
//
if (expr_type.IsPointer)
return null;
if (expr_type.IsValueType)
return new BoxedCast (expr);
if (expr_type.IsClass || expr_type.IsInterface)
return new EmptyCast (expr, target_type);
} else if (expr_type.IsSubclassOf (target_type)) {
//
// Special case: enumeration to System.Enum.
// System.Enum is not a value type, it is a class, so we need
// a boxing conversion
//
if (expr_type.IsEnum)
return new BoxedCast (expr);
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 (target_type.IsInterface) {
if (TypeManager.ImplementsInterface (expr_type, target_type)){
if (expr_type.IsClass)
return new EmptyCast (expr, target_type);
else if (expr_type.IsValueType)
return new BoxedCast (expr);
}
}
// 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 ();
if (MyEmptyExpr == null)
MyEmptyExpr = new EmptyExpression ();
MyEmptyExpr.SetType (expr_element_type);
Type target_element_type = target_type.GetElementType ();
if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
if (StandardConversionExists (MyEmptyExpr,
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;
}
///
/// 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);
}
Type real_target_type = target_type;
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to short, int, long, float, double.
//
if (real_target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.short_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
} else if (expr_type == TypeManager.byte_type){
//
// From byte to short, ushort, int, uint, long, ulong, float, double
//
if ((real_target_type == TypeManager.short_type) ||
(real_target_type == TypeManager.ushort_type) ||
(real_target_type == TypeManager.int32_type) ||
(real_target_type == TypeManager.uint32_type))
return new EmptyCast (expr, target_type);
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
} else if (expr_type == TypeManager.short_type){
//
// From short to int, long, float, double
//
if (real_target_type == TypeManager.int32_type)
return new EmptyCast (expr, target_type);
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to int, uint, long, ulong, float, double
//
if (real_target_type == TypeManager.uint32_type)
return new EmptyCast (expr, target_type);
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (real_target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
} else if (expr_type == TypeManager.int32_type){
//
// From int to long, float, double
//
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to long, ulong, float, double
//
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
} else if (expr_type == TypeManager.int64_type){
//
// From long/ulong to float, double
//
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
} else if (expr_type == TypeManager.uint64_type){
//
// From ulong to float, double
//
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
} else if (expr_type == TypeManager.char_type){
//
// From char to ushort, int, uint, long, ulong, float, double
//
if ((real_target_type == TypeManager.ushort_type) ||
(real_target_type == TypeManager.int32_type) ||
(real_target_type == TypeManager.uint32_type))
return new EmptyCast (expr, target_type);
if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
} else if (expr_type == TypeManager.float_type){
//
// float to double
//
if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
}
return null;
}
//
// Tests whether an implicit reference conversion exists between expr_type
// and target_type
//
public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
//
// This is the boxed case.
//
if (target_type == TypeManager.object_type) {
if ((expr_type.IsClass) ||
(expr_type.IsValueType) ||
(expr_type.IsInterface))
return true;
} else if (expr_type.IsSubclassOf (target_type)) {
return true;
} else {
// Please remember that all code below actually comes
// from ImplicitReferenceConversion so make sure code remains in sync
// from any class-type S to any interface-type T.
if (target_type.IsInterface) {
if (TypeManager.ImplementsInterface (expr_type, target_type))
return true;
}
// from any interface type S to interface-type T.
if (expr_type.IsInterface && target_type.IsInterface)
if (TypeManager.ImplementsInterface (expr_type, target_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 ();
if (MyEmptyExpr == null)
MyEmptyExpr = new EmptyExpression ();
MyEmptyExpr.SetType (expr_element_type);
Type target_element_type = target_type.GetElementType ();
if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
if (StandardConversionExists (MyEmptyExpr,
target_element_type))
return true;
}
}
// from an array-type to System.Array
if (expr_type.IsArray && (target_type == TypeManager.array_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.
if (expr is NullLiteral && !target_type.IsValueType &&
!TypeManager.IsEnumType (target_type))
return true;
}
return false;
}
///
/// Same as StandardConversionExists except that it also looks at
/// implicit user defined conversions - needed for overload resolution
///
public static bool ImplicitConversionExists (EmitContext ec, Expression expr, Type target_type)
{
if (StandardConversionExists (expr, target_type) == true)
return true;
Expression dummy = ImplicitUserConversion (ec, expr, target_type, Location.Null);
if (dummy != null)
return true;
return false;
}
///
/// Determines if a standard implicit conversion exists from
/// expr_type to target_type
///
public static bool StandardConversionExists (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
if (expr_type == null || expr_type == TypeManager.void_type)
return false;
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;
}
if (ImplicitReferenceConversionExists (expr, target_type))
return true;
if (expr is IntConstant){
int value = ((IntConstant) expr).Value;
if (target_type == TypeManager.sbyte_type){
if (value >= SByte.MinValue && value <= SByte.MaxValue)
return true;
} else if (target_type == TypeManager.byte_type){
if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
return true;
} else if (target_type == TypeManager.short_type){
if (value >= Int16.MinValue && value <= Int16.MaxValue)
return true;
} else if (target_type == TypeManager.ushort_type){
if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
return true;
} else if (target_type == TypeManager.uint32_type){
if (value >= 0)
return true;
} 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 true;
}
if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
return true;
}
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 true;
}
if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
IntLiteral i = (IntLiteral) expr;
if (i.Value == 0)
return true;
}
if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
return true;
return false;
}
//
// Used internally by FindMostEncompassedType, this is used
// to avoid creating lots of objects in the tight loop inside
// FindMostEncompassedType
//
static EmptyExpression priv_fmet_param;
///
/// Finds "most encompassed type" according to the spec (13.4.2)
/// amongst the methods in the MethodGroupExpr
///
static Type FindMostEncompassedType (ArrayList types)
{
Type best = null;
if (priv_fmet_param == null)
priv_fmet_param = new EmptyExpression ();
foreach (Type t in types){
priv_fmet_param.SetType (t);
if (best == null) {
best = t;
continue;
}
if (StandardConversionExists (priv_fmet_param, best))
best = t;
}
return best;
}
//
// Used internally by FindMostEncompassingType, this is used
// to avoid creating lots of objects in the tight loop inside
// FindMostEncompassingType
//
static EmptyExpression priv_fmee_ret;
///
/// Finds "most encompassing type" according to the spec (13.4.2)
/// amongst the types in the given set
///
static Type FindMostEncompassingType (ArrayList types)
{
Type best = null;
if (priv_fmee_ret == null)
priv_fmee_ret = new EmptyExpression ();
foreach (Type t in types){
priv_fmee_ret.SetType (best);
if (best == null) {
best = t;
continue;
}
if (StandardConversionExists (priv_fmee_ret, t))
best = t;
}
return best;
}
//
// Used to avoid creating too many objects
//
static EmptyExpression priv_fms_expr;
///
/// Finds the most specific source Sx according to the rules of the spec (13.4.4)
/// by making use of FindMostEncomp* methods. Applies the correct rules separately
/// for explicit and implicit conversion operators.
///
static public Type FindMostSpecificSource (MethodGroupExpr me, Expression source,
bool apply_explicit_conv_rules,
Location loc)
{
ArrayList src_types_set = new ArrayList ();
if (priv_fms_expr == null)
priv_fms_expr = new EmptyExpression ();
//
// If any operator converts from S then Sx = S
//
Type source_type = source.Type;
foreach (MethodBase mb in me.Methods){
ParameterData pd = Invocation.GetParameterData (mb);
Type param_type = pd.ParameterType (0);
if (param_type == source_type)
return param_type;
if (apply_explicit_conv_rules) {
//
// From the spec :
// Find the set of applicable user-defined conversion operators, U. This set
// consists of the
// user-defined implicit or explicit conversion operators declared by
// the classes or structs in D that convert from a type encompassing
// or encompassed by S to a type encompassing or encompassed by T
//
priv_fms_expr.SetType (param_type);
if (StandardConversionExists (priv_fms_expr, source_type))
src_types_set.Add (param_type);
else {
if (StandardConversionExists (source, param_type))
src_types_set.Add (param_type);
}
} else {
//
// Only if S is encompassed by param_type
//
if (StandardConversionExists (source, param_type))
src_types_set.Add (param_type);
}
}
//
// Explicit Conv rules
//
if (apply_explicit_conv_rules) {
ArrayList candidate_set = new ArrayList ();
foreach (Type param_type in src_types_set){
if (StandardConversionExists (source, param_type))
candidate_set.Add (param_type);
}
if (candidate_set.Count != 0)
return FindMostEncompassedType (candidate_set);
}
//
// Final case
//
if (apply_explicit_conv_rules)
return FindMostEncompassingType (src_types_set);
else
return FindMostEncompassedType (src_types_set);
}
//
// Useful in avoiding proliferation of objects
//
static EmptyExpression priv_fmt_expr;
///
/// Finds the most specific target Tx according to section 13.4.4
///
static public Type FindMostSpecificTarget (MethodGroupExpr me, Type target,
bool apply_explicit_conv_rules,
Location loc)
{
ArrayList tgt_types_set = new ArrayList ();
if (priv_fmt_expr == null)
priv_fmt_expr = new EmptyExpression ();
//
// If any operator converts to T then Tx = T
//
foreach (MethodInfo mi in me.Methods){
Type ret_type = mi.ReturnType;
if (ret_type == target)
return ret_type;
if (apply_explicit_conv_rules) {
//
// From the spec :
// Find the set of applicable user-defined conversion operators, U.
//
// This set consists of the
// user-defined implicit or explicit conversion operators declared by
// the classes or structs in D that convert from a type encompassing
// or encompassed by S to a type encompassing or encompassed by T
//
priv_fms_expr.SetType (ret_type);
if (StandardConversionExists (priv_fms_expr, target))
tgt_types_set.Add (ret_type);
else {
priv_fms_expr.SetType (target);
if (StandardConversionExists (priv_fms_expr, ret_type))
tgt_types_set.Add (ret_type);
}
} else {
//
// Only if T is encompassed by param_type
//
priv_fms_expr.SetType (ret_type);
if (StandardConversionExists (priv_fms_expr, target))
tgt_types_set.Add (ret_type);
}
}
//
// Explicit conv rules
//
if (apply_explicit_conv_rules) {
ArrayList candidate_set = new ArrayList ();
foreach (Type ret_type in tgt_types_set){
priv_fmt_expr.SetType (ret_type);
if (StandardConversionExists (priv_fmt_expr, target))
candidate_set.Add (ret_type);
}
if (candidate_set.Count != 0)
return FindMostEncompassingType (candidate_set);
}
//
// Okay, final case !
//
if (apply_explicit_conv_rules)
return FindMostEncompassedType (tgt_types_set);
else
return FindMostEncompassingType (tgt_types_set);
}
///
/// 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);
}
///
/// Computes the MethodGroup for the user-defined conversion
/// operators from source_type to target_type. 'look_for_explicit'
/// controls whether we should also include the list of explicit
/// operators
///
static MethodGroupExpr GetConversionOperators (EmitContext ec,
Type source_type, Type target_type,
Location loc, bool look_for_explicit)
{
Expression mg1 = null, mg2 = null;
Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
string op_name;
//
// FIXME : How does the False operator come into the picture ?
// This doesn't look complete and very correct !
//
if (target_type == TypeManager.bool_type && !look_for_explicit)
op_name = "op_True";
else
op_name = "op_Implicit";
MethodGroupExpr union3;
mg1 = MethodLookup (ec, source_type, op_name, loc);
if (source_type.BaseType != null)
mg2 = MethodLookup (ec, source_type.BaseType, op_name, loc);
if (mg1 == null)
union3 = (MethodGroupExpr) mg2;
else if (mg2 == null)
union3 = (MethodGroupExpr) mg1;
else
union3 = Invocation.MakeUnionSet (mg1, mg2, loc);
mg1 = MethodLookup (ec, target_type, op_name, loc);
if (mg1 != null){
if (union3 != null)
union3 = Invocation.MakeUnionSet (union3, mg1, loc);
else
union3 = (MethodGroupExpr) mg1;
}
if (target_type.BaseType != null)
mg1 = MethodLookup (ec, target_type.BaseType, op_name, loc);
if (mg1 != null){
if (union3 != null)
union3 = Invocation.MakeUnionSet (union3, mg1, loc);
else
union3 = (MethodGroupExpr) mg1;
}
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 = MethodLookup (ec, source_type.BaseType, op_name, loc);
mg7 = MemberLookup (ec, target_type, op_name, loc);
if (target_type.BaseType != null)
mg8 = MethodLookup (ec, target_type.BaseType, op_name, loc);
MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6, loc);
MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8, loc);
union4 = Invocation.MakeUnionSet (union5, union6, loc);
}
return Invocation.MakeUnionSet (union3, union4, loc);
}
///
/// User-defined conversions
///
static public Expression UserDefinedConversion (EmitContext ec, Expression source,
Type target, Location loc,
bool look_for_explicit)
{
MethodGroupExpr union;
Type source_type = source.Type;
MethodBase method = null;
union = GetConversionOperators (ec, source_type, target, loc, look_for_explicit);
if (union == null)
return null;
Type most_specific_source, most_specific_target;
#if BLAH
foreach (MethodBase m in union.Methods){
Console.WriteLine ("Name: " + m.Name);
Console.WriteLine (" : " + ((MethodInfo)m).ReturnType);
}
#endif
most_specific_source = FindMostSpecificSource (union, source, look_for_explicit, loc);
if (most_specific_source == null)
return null;
most_specific_target = FindMostSpecificTarget (union, target, look_for_explicit, loc);
if (most_specific_target == null)
return null;
int count = 0;
foreach (MethodBase mb in union.Methods){
ParameterData pd = Invocation.GetParameterData (mb);
MethodInfo mi = (MethodInfo) mb;
if (pd.ParameterType (0) == most_specific_source &&
mi.ReturnType == most_specific_target) {
method = mb;
count++;
}
}
if (method == null || count > 1)
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;
Expression e;
e = new UserCast ((MethodInfo) method, source, loc);
if (e.Type != target){
if (!look_for_explicit)
e = ConvertImplicitStandard (ec, e, target, loc);
else
e = ConvertExplicitStandard (ec, e, target, loc);
}
return e;
}
///
/// 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;
e = RuntimeConversion (ec, expr, target_type, loc);
if (e != null)
return e;
return null;
}
///
/// Converts the resolved expression 'expr' into the
/// 'target_type' using the Microsoft.VisualBasic runtime.
/// It returns a new expression that can be used
/// in a context that expects a 'target_type'.
///
static private Expression RTConversionExpression (EmitContext ec, string s, Expression expr, Location loc)
{
Expression etmp, e;
ArrayList args;
Argument arg;
etmp = Mono.MonoBASIC.Parser.DecomposeQI("Microsoft.VisualBasic.CompilerServices." + s, loc);
args = new ArrayList();
arg = new Argument (expr, Argument.AType.Expression);
args.Add (arg);
e = (Expression) new Invocation (etmp, args, loc);
e = e.Resolve(ec);
return (e);
}
static public bool RuntimeConversionExists (EmitContext ec, Expression expr, Type target_type)
{
return (RuntimeConversion (ec, expr, target_type,Location.Null)) != null;
}
static public Expression RuntimeConversion (EmitContext ec, Expression expr,
Type target_type, Location loc)
{
Type expr_type = expr.Type;
TypeCode dest_type = Type.GetTypeCode (target_type);
TypeCode src_type = Type.GetTypeCode (expr_type);
Expression e = null;
// VB.NET Objects can be converted to anything by default
// unless, that is, an exception at runtime blows it all
if (src_type == TypeCode.Object) {
Expression cast_type = Mono.MonoBASIC.Parser.DecomposeQI(target_type.ToString(), loc);
Cast ce = new Cast (cast_type, expr, loc);
return ce.Resolve (ec);
}
switch (dest_type) {
case TypeCode.String:
switch (src_type) {
case TypeCode.SByte:
case TypeCode.Byte:
e = RTConversionExpression(ec, "StringType.FromByte", expr, loc);
break;
case TypeCode.UInt16:
case TypeCode.Int16:
e = RTConversionExpression(ec, "StringType.FromShort", expr, loc);
break;
case TypeCode.UInt32:
case TypeCode.Int32:
e = RTConversionExpression(ec, "StringType.FromInteger", expr, loc);
break;
case TypeCode.UInt64:
case TypeCode.Int64:
e = RTConversionExpression(ec, "StringType.FromLong", expr, loc);
break;
case TypeCode.Char:
e = RTConversionExpression(ec, "StringType.FromChar", expr, loc);
break;
case TypeCode.Single:
e = RTConversionExpression(ec, "StringType.FromSingle", expr, loc);
break;
case TypeCode.Double:
e = RTConversionExpression(ec, "StringType.FromDouble", expr, loc);
break;
case TypeCode.Boolean:
e = RTConversionExpression(ec, "StringType.FromBoolean", expr, loc);
break;
case TypeCode.DateTime:
e = RTConversionExpression(ec, "StringType.FromDate", expr, loc);
break;
case TypeCode.Decimal:
e = RTConversionExpression(ec, "StringType.FromDecimal", expr, loc);
break;
case TypeCode.Object:
e = RTConversionExpression(ec, "StringType.FromObject", expr, loc);
break;
}
break;
case TypeCode.Int32:
case TypeCode.UInt32:
switch (src_type) {
case TypeCode.String:
e = RTConversionExpression(ec, "IntegerType.FromString", expr, loc);
break;
case TypeCode.Object:
e = RTConversionExpression(ec, "IntegerType.FromObject", expr, loc);
break;
}
break;
case TypeCode.Int16:
case TypeCode.UInt16:
switch (src_type) {
case TypeCode.String:
e = RTConversionExpression(ec, "ShortType.FromString", expr, loc);
break;
case TypeCode.Object:
e = RTConversionExpression(ec, "ShortType.FromObject", expr, loc);
break;
}
break;
case TypeCode.Byte:
// Ok, this *is* broken
e = RTConversionExpression(ec, "ByteType.FromObject", expr, loc);
break;
}
// We must examine separately some types that
// don't have a TypeCode but are supported
// in the runtime
if (expr_type == typeof(System.String) && target_type == typeof (System.Char[])) {
e = RTConversionExpression(ec, "CharArrayType.FromString", expr, loc);
}
return e;
}
///
/// 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 could 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)){
Type underlying = TypeManager.EnumToUnderlying (target_type);
Constant e = (Constant) ic;
//
// Possibly, we need to create a different 0 literal before passing
// to EnumConstant
//n
if (underlying == TypeManager.int64_type)
e = new LongLiteral (0);
else if (underlying == TypeManager.uint64_type)
e = new ULongLiteral (0);
return new EnumConstant (e, target_type);
}
return null;
}
static public void Error_CannotConvertImplicit (Location loc, Type source, Type target)
{
string msg = "Cannot convert implicitly from '"+
TypeManager.MonoBASIC_Name (source) + "' to '" +
TypeManager.MonoBASIC_Name (target) + "'";
Report.Error (29, loc, msg);
}
///
/// 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){
Report.Error (664, loc,
"Double literal cannot be implicitly converted to " +
"float type, use F suffix to create a float literal");
}
Error_CannotConvertImplicit (loc, source.Type, target_type);
return null;
}
///
/// Performs the explicit numeric conversions
///
static Expression ConvertNumericExplicit (EmitContext ec, Expression expr, Type target_type, Location loc)
{
Type expr_type = expr.Type;
//
// If we have an enumeration, extract the underlying type,
// use this during the comparison, but wrap around the original
// target_type
//
Type real_target_type = target_type;
if (TypeManager.IsEnumType (real_target_type))
real_target_type = TypeManager.EnumToUnderlying (real_target_type);
if (StandardConversionExists (expr, real_target_type)){
Expression ce = ConvertImplicitStandard (ec, expr, real_target_type, loc);
if (real_target_type != target_type)
return new EmptyCast (ce, target_type);
return ce;
}
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to byte, ushort, uint, ulong, char
//
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U1);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U2);
if (real_target_type == TypeManager.uint32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U4);
if (real_target_type == TypeManager.uint64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_CH);
} else if (expr_type == TypeManager.byte_type){
//
// From byte to sbyte and char
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_I1);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_CH);
} else if (expr_type == TypeManager.short_type){
//
// From short to sbyte, byte, ushort, uint, ulong, char
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U1);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U2);
if (real_target_type == TypeManager.uint32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U4);
if (real_target_type == TypeManager.uint64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_CH);
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to sbyte, byte, short, char
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I2);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, 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 (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I2);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U2);
if (real_target_type == TypeManager.uint32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U4);
if (real_target_type == TypeManager.uint64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_CH);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to sbyte, byte, short, ushort, int, char
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I2);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U2);
if (real_target_type == TypeManager.int32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I4);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, 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 (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I2);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U2);
if (real_target_type == TypeManager.int32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I4);
if (real_target_type == TypeManager.uint32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U4);
if (real_target_type == TypeManager.uint64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, 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 (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I2);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U2);
if (real_target_type == TypeManager.int32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I4);
if (real_target_type == TypeManager.uint32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U4);
if (real_target_type == TypeManager.int64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_CH);
} else if (expr_type == TypeManager.char_type){
//
// From char to sbyte, byte, short
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, 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 (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I2);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U2);
if (real_target_type == TypeManager.int32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I4);
if (real_target_type == TypeManager.uint32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U4);
if (real_target_type == TypeManager.int64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I8);
if (real_target_type == TypeManager.uint64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_CH);
} else if (expr_type == TypeManager.double_type){
//
// From double to byte, byte, short,
// ushort, int, uint, long, ulong,
// char, float or decimal
//
if (real_target_type == TypeManager.sbyte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I1);
if (real_target_type == TypeManager.byte_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U1);
if (real_target_type == TypeManager.short_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I2);
if (real_target_type == TypeManager.ushort_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U2);
if (real_target_type == TypeManager.int32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I4);
if (real_target_type == TypeManager.uint32_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U4);
if (real_target_type == TypeManager.int64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I8);
if (real_target_type == TypeManager.uint64_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U8);
if (real_target_type == TypeManager.char_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_CH);
if (real_target_type == TypeManager.float_type)
return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_R4);
}
// 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
///
public 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, provided S is not sealed
// and provided S does not implement T.
//
if (target_type.IsInterface && !source_type.IsSealed &&
!TypeManager.ImplementsInterface (source_type, target_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 || TypeManager.ImplementsInterface (target_type, source_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.IsArray){
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){
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 || 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.IsArray) {
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, loc);
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));
}
Expression t = ConvertImplicit (ec, e, target_type, loc);
if (t != null)
return t;
t = ConvertNumericExplicit (ec, e, target_type, loc);
if (t != null)
return t;
t = RuntimeConversion (ec, e, target_type, loc);
if (t != null)
return t;
Error_CannotConvertType (loc, expr_type, target_type);
return null;
}
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, loc);
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;
ne = RuntimeConversion (ec, expr, target_type, loc);
if (ne != null)
return ne;
Error_CannotConvertType (loc, expr_type, target_type);
return null;
}
///
/// Same as ConvertExplicit, 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, l);
if (ne != null)
return ne;
ne = ConvertReferenceExplicit (expr, target_type);
if (ne != null)
return ne;
ne = RuntimeConversion (ec, expr, target_type, l);
if (ne != null)
return ne;
Error_CannotConvertType (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'
///
public void Error118 (string expected)
{
string kind = "Unknown";
kind = ExprClassName (eclass);
Error (118, "Expression denotes a '" + kind +
"' where a '" + expected + "' was expected");
}
public void Error118 (ResolveFlags flags)
{
ArrayList valid = new ArrayList (10);
if ((flags & ResolveFlags.VariableOrValue) != 0) {
valid.Add ("variable");
valid.Add ("value");
}
if ((flags & ResolveFlags.Type) != 0)
valid.Add ("type");
if ((flags & ResolveFlags.MethodGroup) != 0)
valid.Add ("method group");
if ((flags & ResolveFlags.SimpleName) != 0)
valid.Add ("simple name");
if (valid.Count == 0)
valid.Add ("unknown");
StringBuilder sb = new StringBuilder ();
for (int i = 0; i < valid.Count; i++) {
if (i > 0)
sb.Append (", ");
else if (i == valid.Count)
sb.Append (" or ");
sb.Append (valid [i]);
}
string kind = ExprClassName (eclass);
Error (119, "Expression denotes a '" + kind + "' where " +
"a '" + sb.ToString () + "' was expected");
}
static void Error_ConstantValueCannotBeConverted (Location l, string val, Type t)
{
Report.Error (31, l, "Constant value '" + val + "' cannot be converted to " +
TypeManager.MonoBASIC_Name (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 ();
}
Error_ConstantValueCannotBeConverted (loc, s, target_type);
return null;
}
//
// Load the object from the pointer.
//
public static void LoadFromPtr (ILGenerator ig, Type t)
{
if (t == TypeManager.int32_type)
ig.Emit (OpCodes.Ldind_I4);
else if (t == TypeManager.uint32_type)
ig.Emit (OpCodes.Ldind_U4);
else if (t == TypeManager.short_type)
ig.Emit (OpCodes.Ldind_I2);
else if (t == TypeManager.ushort_type)
ig.Emit (OpCodes.Ldind_U2);
else if (t == TypeManager.char_type)
ig.Emit (OpCodes.Ldind_U2);
else if (t == TypeManager.byte_type)
ig.Emit (OpCodes.Ldind_U1);
else if (t == TypeManager.sbyte_type)
ig.Emit (OpCodes.Ldind_I1);
else if (t == TypeManager.uint64_type)
ig.Emit (OpCodes.Ldind_I8);
else if (t == TypeManager.int64_type)
ig.Emit (OpCodes.Ldind_I8);
else if (t == TypeManager.float_type)
ig.Emit (OpCodes.Ldind_R4);
else if (t == TypeManager.double_type)
ig.Emit (OpCodes.Ldind_R8);
else if (t == TypeManager.bool_type)
ig.Emit (OpCodes.Ldind_I1);
else if (t == TypeManager.intptr_type)
ig.Emit (OpCodes.Ldind_I);
else if (TypeManager.IsEnumType (t)) {
if (t == TypeManager.enum_type)
ig.Emit (OpCodes.Ldind_Ref);
else
LoadFromPtr (ig, TypeManager.EnumToUnderlying (t));
} else if (t.IsValueType)
ig.Emit (OpCodes.Ldobj, t);
else
ig.Emit (OpCodes.Ldind_Ref);
}
//
// The stack contains the pointer and the value of type 'type'
//
public static void StoreFromPtr (ILGenerator ig, Type type)
{
if (TypeManager.IsEnumType (type))
type = TypeManager.EnumToUnderlying (type);
if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
ig.Emit (OpCodes.Stind_I4);
else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
ig.Emit (OpCodes.Stind_I8);
else if (type == TypeManager.char_type || type == TypeManager.short_type ||
type == TypeManager.ushort_type)
ig.Emit (OpCodes.Stind_I2);
else if (type == TypeManager.float_type)
ig.Emit (OpCodes.Stind_R4);
else if (type == TypeManager.double_type)
ig.Emit (OpCodes.Stind_R8);
else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
type == TypeManager.bool_type)
ig.Emit (OpCodes.Stind_I1);
else if (type == TypeManager.intptr_type)
ig.Emit (OpCodes.Stind_I);
else if (type.IsValueType)
ig.Emit (OpCodes.Stobj, type);
else
ig.Emit (OpCodes.Stind_Ref);
}
//
// Returns the size of type 't' if known, otherwise, 0
//
public static int GetTypeSize (Type t)
{
t = TypeManager.TypeToCoreType (t);
if (t == TypeManager.int32_type ||
t == TypeManager.uint32_type ||
t == TypeManager.float_type)
return 4;
else if (t == TypeManager.int64_type ||
t == TypeManager.uint64_type ||
t == TypeManager.double_type)
return 8;
else if (t == TypeManager.byte_type ||
t == TypeManager.sbyte_type ||
t == TypeManager.bool_type)
return 1;
else if (t == TypeManager.short_type ||
t == TypeManager.char_type ||
t == TypeManager.ushort_type)
return 2;
else if (t == TypeManager.decimal_type)
return 16;
else
return 0;
}
//
// Default implementation of IAssignMethod.CacheTemporaries
//
public void CacheTemporaries (EmitContext ec)
{
}
static void Error_NegativeArrayIndex (Location loc)
{
Report.Error (284, loc, "Can not create array with a negative size");
}
//
// Converts 'source' to an int, uint, long or ulong.
//
public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
{
Expression target;
bool old_checked = ec.CheckState;
ec.CheckState = true;
target = ConvertImplicit (ec, source, TypeManager.int32_type, loc);
if (target == null){
target = ConvertImplicit (ec, source, TypeManager.uint32_type, loc);
if (target == null){
target = ConvertImplicit (ec, source, TypeManager.int64_type, loc);
if (target == null){
target = ConvertImplicit (ec, source, TypeManager.uint64_type, loc);
if (target == null)
Expression.Error_CannotConvertImplicit (loc, source.Type, TypeManager.int32_type);
}
}
}
ec.CheckState = old_checked;
//
// Only positive constants are allowed at compile time
//
if (target is Constant){
if (target is IntConstant){
if (((IntConstant) target).Value < 0){
Error_NegativeArrayIndex (loc);
return null;
}
}
if (target is LongConstant){
if (((LongConstant) target).Value < 0){
Error_NegativeArrayIndex (loc);
return null;
}
}
}
return target;
}
}
///
/// 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 ();
}
public override DoubleConstant ConvertToDouble ()
{
return Child.ConvertToDouble ();
}
public override FloatConstant ConvertToFloat ()
{
return Child.ConvertToFloat ();
}
public override ULongConstant ConvertToULong ()
{
return Child.ConvertToULong ();
}
public override LongConstant ConvertToLong ()
{
return Child.ConvertToLong ();
}
public override UIntConstant ConvertToUInt ()
{
return Child.ConvertToUInt ();
}
public override IntConstant ConvertToInt ()
{
return Child.ConvertToInt ();
}
}
///
/// 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);
}
}
///
/// 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;
bool checked_state;
public ConvCast (EmitContext ec, Expression child, Type return_type, Mode m)
: base (child, return_type)
{
checked_state = ec.CheckState;
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 (checked_state){
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, ITypeExpression {
public readonly string Name;
public SimpleName (string name, Location l)
{
Name = name;
loc = l;
}
public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
{
if (ec.IsFieldInitializer)
Report.Error (
236, l,
"A field initializer cannot reference the non-static field, " +
"method or property '"+name+"'");
else
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 (EmitContext ec, Expression e)
{
if (e is IMemberExpr){
IMemberExpr member = (IMemberExpr) e;
if (!member.IsStatic){
Error_ObjectRefRequired (ec, loc, Name);
return null;
}
}
return e;
}
public override Expression DoResolve (EmitContext ec)
{
return SimpleNameResolve (ec, null, false);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return SimpleNameResolve (ec, right_side, false);
}
public Expression DoResolveAllowStatic (EmitContext ec)
{
return SimpleNameResolve (ec, null, true);
}
public Expression DoResolveType (EmitContext ec)
{
//
// Stage 3: Lookup symbol in the various namespaces.
//
DeclSpace ds = ec.DeclSpace;
Type t;
string alias_value;
if (ec.ResolvingTypeTree){
int errors = Report.Errors;
Type dt = ec.DeclSpace.FindType (loc, Name);
if (Report.Errors != errors)
return null;
if (dt != null)
return new TypeExpr (dt, loc);
}
if ((t = RootContext.LookupType (ds, Name, true, loc)) != null)
return new TypeExpr (t, loc);
//
// 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
//
alias_value = ec.DeclSpace.LookupAlias (Name);
if (Name.IndexOf ('.') == -1 && alias_value != null) {
if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
return new TypeExpr (t, loc);
// we have alias value, but it isn't Type, so try if it's namespace
return new SimpleName (alias_value, loc);
}
// No match, maybe our parent can compose us
// into something meaningful.
return this;
}
///
/// 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, Expression right_side, bool allow_static)
{
Expression e = null;
//
// Stage 1: Performed by the parser (binding to locals or parameters).
//
Block current_block = ec.CurrentBlock;
if (ec.InvokingOwnOverload == false && current_block != null && current_block.IsVariableDefined (Name)){
LocalVariableReference var;
var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
if (right_side != null)
return var.ResolveLValue (ec, right_side);
else
return var.Resolve (ec);
}
if (current_block != null){
int idx = -1;
Parameter par = null;
Parameters pars = current_block.Parameters;
if (pars != null)
par = pars.GetParameterByName (Name, out idx);
if (par != null) {
ParameterReference param;
param = new ParameterReference (pars, idx, Name, loc);
if (right_side != null)
return param.ResolveLValue (ec, right_side);
else
return param.Resolve (ec);
}
}
//
// Stage 2: Lookup members
//
//
// For enums, the TypeBuilder is not ec.DeclSpace.TypeBuilder
// Hence we have two different cases
//
DeclSpace lookup_ds = ec.DeclSpace;
do {
if (lookup_ds.TypeBuilder == null)
break;
e = MemberLookup (ec, lookup_ds.TypeBuilder, Name, loc);
if (e != null)
break;
//
// Classes/structs keep looking, enums break
//
if (lookup_ds is TypeContainer)
lookup_ds = ((TypeContainer) lookup_ds).Parent;
else
break;
} while (lookup_ds != null);
if (e == null && ec.ContainerType != null)
e = MemberLookup (ec, ec.ContainerType, Name, loc);
// #52067 - Start - Trying to solve
if (e == null) {
string[] NamespacesInScope = RootContext.SourceBeingCompiled.GetNamespacesInScope(ec.DeclSpace.Namespace.Name);
ArrayList lookups = new ArrayList();
ArrayList typelookups = new ArrayList();
foreach(Type type in TypeManager.GetPertinentStandardModules(NamespacesInScope)) {
e = MemberLookup(ec, type, Name, loc);
if (e != null)
lookups.Add(e);
typelookups.Add(type);
}
if (lookups.Count == 1) {
e = (Expression)lookups[0];
} else {
if (lookups.Count > 1) {
StringBuilder sb = new StringBuilder();
foreach(Type type in typelookups)
sb.Append("'" + type.FullName + "'");
Error (-1, "The name '" + Name + "' can be resolved to a member of more than one standard module: " + sb.ToString() + ". Please fully qualify it.");
return null;
}
}
}
// #52067 - End
if (e == null)
return DoResolveType (ec);
if (e is TypeExpr)
return e;
if (e is IMemberExpr) {
e = MemberAccess.ResolveMemberAccess (ec, e, null, loc, this);
if (e == null)
return null;
IMemberExpr me = e as IMemberExpr;
if (me == null)
return e;
// This fails if ResolveMemberAccess() was unable to decide whether
// it's a field or a type of the same name.
if (!me.IsStatic && (me.InstanceExpression == null))
return e;
/* FIXME If this is not commented out, it seems that it's not possible to reach class members in mBas.
Maybe a grammar-related problem?
if (!me.IsStatic &&
TypeManager.IsNestedChildOf (me.InstanceExpression.Type, me.DeclaringType)) {
Error (38, "Cannot access nonstatic member '" + me.Name + "' of " +
"outer type '" + me.DeclaringType + "' via nested type '" +
me.InstanceExpression.Type + "'");
return null;
}
*/
if (right_side != null)
e = e.DoResolveLValue (ec, right_side);
else
e = e.DoResolve (ec);
return e;
}
if (ec.IsStatic || ec.IsFieldInitializer){
if (allow_static)
return e;
return MemberStaticCheck (ec, 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 (30451, "The name '" + Name +
"' does not exist in the class '" +
ec.DeclSpace.Name + "'");
}
public override string ToString ()
{
return Name;
}
}
///
/// Fully resolved expression that evaluates to a type
///
public class TypeExpr : Expression, ITypeExpression {
public TypeExpr (Type t, Location l)
{
Type = t;
eclass = ExprClass.Type;
loc = l;
}
public virtual Expression DoResolveType (EmitContext ec)
{
return this;
}
override public Expression DoResolve (EmitContext ec)
{
return this;
}
override public void Emit (EmitContext ec)
{
throw new Exception ("Should never be called");
}
public override string ToString ()
{
return Type.ToString ();
}
}
///
/// Used to create types from a fully qualified name. These are just used
/// by the parser to setup the core types. A TypeLookupExpression is always
/// classified as a type.
///
public class TypeLookupExpression : TypeExpr {
string name;
public TypeLookupExpression (string name) : base (null, Location.Null)
{
this.name = name;
}
public override Expression DoResolveType (EmitContext ec)
{
if (type == null)
type = RootContext.LookupType (ec.DeclSpace, name, false, Location.Null);
return this;
}
public override Expression DoResolve (EmitContext ec)
{
return DoResolveType (ec);
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should never be called");
}
public override string ToString ()
{
return name;
}
}
///
/// MethodGroup Expression.
///
/// This is a fully resolved expression that evaluates to a type
///
public class MethodGroupExpr : Expression, IMemberExpr {
public MethodBase [] Methods;
Expression instance_expression = null;
bool is_explicit_impl = false;
public MethodGroupExpr (MemberInfo [] mi, Location l)
{
Methods = new MethodBase [mi.Length];
mi.CopyTo (Methods, 0);
eclass = ExprClass.MethodGroup;
type = TypeManager.object_type;
loc = l;
}
public MethodGroupExpr (ArrayList list, Location l)
{
Methods = new MethodBase [list.Count];
try {
list.CopyTo (Methods, 0);
} catch {
foreach (MemberInfo m in list){
if (!(m is MethodBase)){
Console.WriteLine ("Name " + m.Name);
Console.WriteLine ("Found a: " + m.GetType ().FullName);
}
}
throw;
}
loc = l;
eclass = ExprClass.MethodGroup;
type = TypeManager.object_type;
}
public Type DeclaringType {
get {
return Methods [0].DeclaringType;
}
}
//
// 'A method group may have associated an instance expression'
//
public Expression InstanceExpression {
get {
return instance_expression;
}
set {
instance_expression = value;
}
}
public bool IsExplicitImpl {
get {
return is_explicit_impl;
}
set {
is_explicit_impl = value;
}
}
public string Name {
get {
return Methods [0].Name;
}
}
public bool IsInstance {
get {
foreach (MethodBase mb in Methods)
if (!mb.IsStatic)
return true;
return false;
}
}
public bool IsStatic {
get {
foreach (MethodBase mb in Methods)
if (mb.IsStatic)
return true;
return false;
}
}
override public Expression DoResolve (EmitContext ec)
{
if (instance_expression != null) {
instance_expression = instance_expression.DoResolve (ec);
if (instance_expression == null)
return null;
}
return this;
}
public void ReportUsageError ()
{
Report.Error (654, loc, "Method '" + Methods [0].DeclaringType + "." +
Methods [0].Name + "()' is referenced without parentheses");
}
override public void Emit (EmitContext ec)
{
ReportUsageError ();
}
bool RemoveMethods (bool keep_static)
{
ArrayList smethods = new ArrayList ();
foreach (MethodBase mb in Methods){
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, IMemberExpr {
public readonly FieldInfo FieldInfo;
Expression instance_expr;
public FieldExpr (FieldInfo fi, Location l)
{
FieldInfo = fi;
eclass = ExprClass.Variable;
type = fi.FieldType;
loc = l;
}
public string Name {
get {
return FieldInfo.Name;
}
}
public bool IsInstance {
get {
return !FieldInfo.IsStatic;
}
}
public bool IsStatic {
get {
return FieldInfo.IsStatic;
}
}
public Type DeclaringType {
get {
return FieldInfo.DeclaringType;
}
}
public Expression InstanceExpression {
get {
return instance_expr;
}
set {
instance_expr = value;
}
}
override public Expression DoResolve (EmitContext ec)
{
if (!FieldInfo.IsStatic){
if (instance_expr == 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");
}
// Resolve the field's instance expression while flow analysis is turned
// off: when accessing a field "a.b", we must check whether the field
// "a.b" is initialized, not whether the whole struct "a" is initialized.
instance_expr = instance_expr.Resolve (ec, ResolveFlags.VariableOrValue |
ResolveFlags.DisableFlowAnalysis);
if (instance_expr == null)
return null;
}
// If the instance expression is a local variable or parameter.
IVariable var = instance_expr as IVariable;
if ((var != null) && !var.IsFieldAssigned (ec, FieldInfo.Name, loc))
return null;
return this;
}
void Report_AssignToReadonly (bool is_instance)
{
string msg;
if (is_instance)
msg = "Readonly field can not be assigned outside " +
"of constructor or variable initializer";
else
msg = "A static readonly field can only be assigned in " +
"a static constructor";
Report.Error (is_instance ? 191 : 198, loc, msg);
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
IVariable var = instance_expr as IVariable;
if (var != null)
var.SetFieldAssigned (ec, FieldInfo.Name);
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_AssignToReadonly (true);
return null;
}
override public void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
bool is_volatile = false;
if (FieldInfo is FieldBuilder){
FieldBase f = TypeManager.GetField (FieldInfo);
if ((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 (instance_expr.Type.IsValueType){
IMemoryLocation ml;
LocalTemporary tempo = null;
if (!(instance_expr is IMemoryLocation)){
tempo = new LocalTemporary (
ec, instance_expr.Type);
InstanceExpression.Emit (ec);
tempo.Store (ec);
ml = tempo;
} else
ml = (IMemoryLocation) instance_expr;
ml.AddressOf (ec, AddressOp.Load);
} else
instance_expr.Emit (ec);
if (is_volatile)
ig.Emit (OpCodes.Volatile);
ig.Emit (OpCodes.Ldfld, FieldInfo);
}
}
public void EmitAssign (EmitContext ec, Expression source)
{
FieldAttributes fa = FieldInfo.Attributes;
bool is_static = (fa & FieldAttributes.Static) != 0;
bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
ILGenerator ig = ec.ig;
if (is_readonly && !ec.IsConstructor){
Report_AssignToReadonly (!is_static);
return;
}
if (!is_static){
Expression instance = instance_expr;
if (instance.Type.IsValueType){
if (instance is IMemoryLocation){
IMemoryLocation ml = (IMemoryLocation) instance;
ml.AddressOf (ec, AddressOp.Store);
} 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){
FieldBase f = TypeManager.GetField (FieldInfo);
if ((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){
FieldBase f = TypeManager.GetField (FieldInfo);
f.status |= Field.Status.ASSIGNED;
}
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
ILGenerator ig = ec.ig;
if (FieldInfo is FieldBuilder){
FieldBase f = TypeManager.GetField (FieldInfo);
if ((f.ModFlags & Modifiers.VOLATILE) != 0)
ig.Emit (OpCodes.Volatile);
}
if (FieldInfo is FieldBuilder){
FieldBase f = TypeManager.GetField (FieldInfo);
if ((mode & AddressOp.Store) != 0)
f.status |= Field.Status.ASSIGNED;
if ((mode & AddressOp.Load) != 0)
f.status |= Field.Status.USED;
}
//
// Handle initonly fields specially: make a copy and then
// get the address of the copy.
//
if (FieldInfo.IsInitOnly && !ec.IsConstructor){
LocalBuilder local;
Emit (ec);
local = ig.DeclareLocal (type);
ig.Emit (OpCodes.Stloc, local);
ig.Emit (OpCodes.Ldloca, local);
return;
}
if (FieldInfo.IsStatic)
ig.Emit (OpCodes.Ldsflda, FieldInfo);
else {
if (instance_expr is IMemoryLocation)
((IMemoryLocation)instance_expr).AddressOf (ec, AddressOp.LoadStore);
else
instance_expr.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, IMemberExpr {
public readonly PropertyInfo PropertyInfo;
public bool IsBase;
MethodInfo getter, setter;
bool is_static;
public ArrayList PropertyArgs;
Expression instance_expr;
public PropertyExpr (EmitContext ec, PropertyInfo pi, Location l)
{
PropertyInfo = pi;
eclass = ExprClass.PropertyAccess;
PropertyArgs = new ArrayList();
is_static = false;
loc = l;
type = TypeManager.TypeToCoreType (pi.PropertyType);
ResolveAccessors (ec);
}
public string Name {
get {
return PropertyInfo.Name;
}
}
public bool IsInstance {
get {
return !is_static;
}
}
public bool IsStatic {
get {
return is_static;
}
}
public Type DeclaringType {
get {
return PropertyInfo.DeclaringType;
}
}
//
// 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;
}
void ResolveAccessors (EmitContext ec)
{
BindingFlags flags = BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance;
MemberInfo [] group;
group = TypeManager.MemberLookup (ec.ContainerType, PropertyInfo.DeclaringType,
MemberTypes.Method, flags, "get_" + PropertyInfo.Name);
//
// The first method is the closest to us
//
if (group != null && group.Length > 0){
getter = (MethodInfo) group [0];
if (getter.IsStatic)
is_static = true;
}
//
// The first method is the closest to us
//
group = TypeManager.MemberLookup (ec.ContainerType, PropertyInfo.DeclaringType,
MemberTypes.Method, flags, "set_" + PropertyInfo.Name);
if (group != null && group.Length > 0){
setter = (MethodInfo) group [0];
if (setter.IsStatic)
is_static = true;
}
}
override public Expression DoResolve (EmitContext ec)
{
if (getter == null){
Report.Error (154, loc,
"The property '" + PropertyInfo.Name +
"' can not be used in " +
"this context because it lacks a get accessor");
return null;
}
if ((instance_expr == null) && ec.IsStatic && !is_static) {
SimpleName.Error_ObjectRefRequired (ec, loc, PropertyInfo.Name);
return null;
}
if (instance_expr != null) {
instance_expr = instance_expr.DoResolve (ec);
if (instance_expr == null)
return null;
}
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (setter == null){
Report.Error (154, loc,
"The property '" + PropertyInfo.Name +
"' can not be used in " +
"this context because it lacks a set accessor");
return null;
}
if (instance_expr != null) {
instance_expr = instance_expr.DoResolve (ec);
if (instance_expr == null)
return null;
}
return this;
}
override public void Emit (EmitContext ec)
{
//
// Special case: length of single dimension array property is turned into ldlen
//
if ((getter == TypeManager.system_int_array_get_length) ||
(getter == TypeManager.int_array_get_length)){
Type iet = instance_expr.Type;
//
// System.Array.Length can be called, but the Type does not
// support invoking GetArrayRank, so test for that case first
//
if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)){
instance_expr.Emit (ec);
ec.ig.Emit (OpCodes.Ldlen);
return;
}
}
Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, getter, null, PropertyArgs, loc);
}
//
// 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 ();
//HERE
args.Add (arg);
Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, setter, args, PropertyArgs,loc);
}
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, IMemberExpr {
public readonly EventInfo EventInfo;
public Expression instance_expr;
bool is_static;
MethodInfo add_accessor, remove_accessor;
public EventExpr (EventInfo ei, Location loc)
{
EventInfo = ei;
this.loc = loc;
eclass = ExprClass.EventAccess;
add_accessor = TypeManager.GetAddMethod (ei);
remove_accessor = TypeManager.GetRemoveMethod (ei);
if (add_accessor.IsStatic || remove_accessor.IsStatic)
is_static = true;
if (EventInfo is MyEventBuilder)
type = ((MyEventBuilder) EventInfo).EventType;
else
type = EventInfo.EventHandlerType;
}
public string Name {
get {
return EventInfo.Name;
}
}
public bool IsInstance {
get {
return !is_static;
}
}
public bool IsStatic {
get {
return is_static;
}
}
public Type DeclaringType {
get {
return EventInfo.DeclaringType;
}
}
public Expression InstanceExpression {
get {
return instance_expr;
}
set {
instance_expr = value;
}
}
public override Expression DoResolve (EmitContext ec)
{
if (instance_expr != null) {
instance_expr = instance_expr.DoResolve (ec);
if (instance_expr == null)
return null;
}
return this;
}
public override void Emit (EmitContext ec)
{
Report.Error (70, loc, "The event '" + Name + "' can only appear on the left hand side of += or -= (except on the defining type)");
}
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, instance_expr, add_accessor, args, loc);
else
Invocation.EmitCall (
ec, false, IsStatic, instance_expr, remove_accessor, args, loc);
}
}
}