//
// ecore.cs: Core of the Expression representation for the intermediate tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
//
// (C) 2001, 2002, 2003 Ximian, Inc.
//
//
namespace Mono.CSharp {
using System;
using System.Collections;
using System.Diagnostics;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
///
/// The ExprClass class contains the is used to pass the
/// classification of an expression (value, variable, namespace,
/// type, method group, property access, event access, indexer access,
/// nothing).
///
public enum ExprClass : byte {
Invalid,
Value,
Variable,
Namespace,
Type,
MethodGroup,
PropertyAccess,
EventAccess,
IndexerAccess,
Nothing,
}
///
/// This is used to tell Resolve in which types of expressions we're
/// interested.
///
[Flags]
public enum ResolveFlags {
// Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
VariableOrValue = 1,
// Returns a type expression.
Type = 2,
// Returns a method group.
MethodGroup = 4,
// 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 {
VariableInfo VariableInfo {
get;
}
bool VerifyFixed (bool is_expression);
}
///
/// 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;
}
}
///
/// 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);
}
///
/// 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);
}
//
// This is used if the expression should be resolved as a type.
// the default implementation fails. Use this method in
// those participants in the SimpleName chain system.
//
public virtual Expression ResolveAsTypeStep (EmitContext ec)
{
return null;
}
//
// This is used to resolve the expression as a type, a null
// value will be returned if the expression is not a type
// reference
//
public TypeExpr ResolveAsTypeTerminal (EmitContext ec)
{
return ResolveAsTypeStep (ec) as TypeExpr;
}
///
/// Resolves an expression and performs semantic analysis on it.
///
///
///
/// Currently Resolve wraps DoResolve to perform sanity
/// checking and assertion checking on what we expect from Resolve.
///
public Expression Resolve (EmitContext ec, ResolveFlags flags)
{
if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type)
return ResolveAsTypeStep (ec);
bool old_do_flow_analysis = ec.DoFlowAnalysis;
if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
ec.DoFlowAnalysis = false;
Expression e;
if (this is SimpleName)
e = ((SimpleName) this).DoResolveAllowStatic (ec);
else
e = DoResolve (ec);
ec.DoFlowAnalysis = old_do_flow_analysis;
if (e == null)
return null;
if (e is SimpleName){
SimpleName s = (SimpleName) e;
if ((flags & ResolveFlags.SimpleName) == 0) {
MemberLookupFailed (ec, null, ec.ContainerType, s.Name,
0, ec.DeclSpace.Name, loc);
return null;
}
return s;
}
if ((e is TypeExpr) || (e is ComposedCast)) {
if ((flags & ResolveFlags.Type) == 0) {
e.Error_UnexpectedKind (flags);
return null;
}
return e;
}
switch (e.eclass) {
case ExprClass.Type:
if ((flags & ResolveFlags.VariableOrValue) == 0) {
e.Error_UnexpectedKind (flags);
return null;
}
break;
case ExprClass.MethodGroup:
if (!RootContext.V2){
if ((flags & ResolveFlags.MethodGroup) == 0) {
((MethodGroupExpr) e).ReportUsageError ();
return null;
}
}
break;
case ExprClass.Value:
case ExprClass.Variable:
case ExprClass.PropertyAccess:
case ExprClass.EventAccess:
case ExprClass.IndexerAccess:
if ((flags & ResolveFlags.VariableOrValue) == 0) {
Console.WriteLine ("I got: {0} and {1}", e.GetType (), e);
Console.WriteLine ("I am {0} and {1}", this.GetType (), this);
FieldInfo fi = ((FieldExpr) e).FieldInfo;
Console.WriteLine ("{0} and {1}", fi.DeclaringType, fi.Name);
e.Error_UnexpectedKind (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;
MemberLookupFailed (ec, null, ec.ContainerType, s.Name,
0, ec.DeclSpace.Name, loc);
return null;
}
if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e +
" ExprClass is Invalid after resolve");
if (e.eclass == ExprClass.MethodGroup) {
((MethodGroupExpr) e).ReportUsageError ();
return null;
}
if ((e.type == null) && !(e is ConstructedType))
throw new Exception ("Expression " + e +
" did not set its type after Resolve");
}
return e;
}
///
/// Emits the code for the expression
///
///
///
/// The Emit method is invoked to generate the code
/// for the expression.
///
public abstract void Emit (EmitContext ec);
public virtual void EmitBranchable (EmitContext ec, Label target, bool onTrue)
{
Emit (ec);
ec.ig.Emit (onTrue ? OpCodes.Brtrue : OpCodes.Brfalse, target);
}
///
/// Protected constructor. Only derivate types should
/// be able to be created
///
protected Expression ()
{
eclass = ExprClass.Invalid;
type = null;
}
///
/// Returns a 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 TypeExpression ((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 queried_type, string name,
MemberTypes mt, BindingFlags bf, Location loc)
{
return MemberLookup (ec, ec.ContainerType, null, queried_type, name, 0, mt, bf, loc);
}
//
// Lookup type `queried_type' for code in class `container_type' with a qualifier of
// `qualifier_type' or null to lookup members in the current class.
//
public static Expression MemberLookup (EmitContext ec, Type container_type,
Type qualifier_type, Type queried_type,
string name, int num_type_arguments,
MemberTypes mt, BindingFlags bf,
Location loc)
{
MemberInfo [] mi = TypeManager.MemberLookup (container_type, qualifier_type,
queried_type, num_type_arguments,
mt, bf, name);
if (mi == null)
return null;
int count = mi.Length;
if (mi [0] is MethodBase)
return new MethodGroupExpr (mi, loc);
if (count > 1)
return null;
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;
public static Expression MemberLookup (EmitContext ec, Type queried_type,
string name, int num_type_arguments,
Location loc)
{
return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
num_type_arguments, AllMemberTypes, AllBindingFlags,
loc);
}
public static Expression MemberLookup (EmitContext ec, Type queried_type,
string name, Location loc)
{
return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
0, AllMemberTypes, AllBindingFlags, loc);
}
public static Expression MemberLookup (EmitContext ec, Type qualifier_type,
Type queried_type, string name, Location loc)
{
return MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
name, 0, AllMemberTypes, AllBindingFlags, loc);
}
public static Expression MethodLookup (EmitContext ec, Type queried_type,
string name, Location loc)
{
return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
0, MemberTypes.Method, AllBindingFlags, loc);
}
///
/// This is a wrapper for MemberLookup that is not used to "probe", but
/// to find a final definition. If the final definition is not found, we
/// look for private members and display a useful debugging message if we
/// find it.
///
public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
Type queried_type, string name,
int num_type_arguments, Location loc)
{
return MemberLookupFinal (ec, qualifier_type, queried_type, name,
num_type_arguments, AllMemberTypes,
AllBindingFlags, loc);
}
public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
Type queried_type, string name,
int num_type_arguments, MemberTypes mt,
BindingFlags bf, Location loc)
{
Expression e;
int errors = Report.Errors;
e = MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
name, num_type_arguments, mt, bf, loc);
if (e != null)
return e;
// Error has already been reported.
if (errors < Report.Errors)
return null;
MemberLookupFailed (ec, qualifier_type, queried_type, name,
num_type_arguments, null, loc);
return null;
}
public static void MemberLookupFailed (EmitContext ec, Type qualifier_type,
Type queried_type, string name,
int num_type_arguments, string class_name,
Location loc)
{
MemberInfo[] mi = TypeManager.MemberLookup (queried_type, null, queried_type,
-1, AllMemberTypes, AllBindingFlags |
BindingFlags.NonPublic, name);
if (mi == null) {
if (class_name != null)
Report.Error (103, loc, "The name `" + name + "' could not be " +
"found in `" + class_name + "'");
else
Report.Error (
117, loc, "`" + queried_type + "' does not contain a " +
"definition for `" + name + "'");
return;
}
if (TypeManager.MemberLookup (queried_type, null, queried_type,
0, AllMemberTypes, AllBindingFlags |
BindingFlags.NonPublic, name) == null) {
if ((mi.Length == 1) && (mi [0] is Type)) {
Type t = (Type) mi [0];
Report.Error (305, loc,
"Using the generic type `{0}' " +
"requires {1} type arguments",
TypeManager.GetFullName (t),
TypeManager.GetNumberOfTypeArguments (t));
return;
}
}
if ((qualifier_type != null) && (qualifier_type != ec.ContainerType) &&
ec.ContainerType.IsSubclassOf (qualifier_type)) {
// Although a derived class can access protected members of
// its base class it cannot do so through an instance of the
// base class (CS1540). If the qualifier_type is a parent of the
// ec.ContainerType and the lookup succeeds with the latter one,
// then we are in this situation.
mi = TypeManager.MemberLookup (
ec.ContainerType, ec.ContainerType, ec.ContainerType,
0, AllMemberTypes, AllBindingFlags, name);
if (mi != null) {
Report.Error (
1540, loc, "Cannot access protected member `" +
TypeManager.CSharpName (qualifier_type) + "." +
name + "' " + "via a qualifier of type `" +
TypeManager.CSharpName (qualifier_type) + "'; the " +
"qualifier must be of type `" +
TypeManager.CSharpName (ec.ContainerType) + "' " +
"(or derived from it)");
return;
}
}
if (qualifier_type != null)
Report.Error (
122, loc, "`" + TypeManager.CSharpName (qualifier_type) + "." +
name + "' is inaccessible due to its protection level");
else if (name == ".ctor") {
Report.Error (143, loc, String.Format ("The type {0} has no constructors defined",
TypeManager.CSharpName (queried_type)));
} else {
Report.Error (
122, loc, "`" + name + "' is inaccessible due to its " +
"protection level");
}
}
static public MemberInfo GetFieldFromEvent (EventExpr event_expr)
{
EventInfo ei = event_expr.EventInfo;
return TypeManager.GetPrivateFieldOfEvent (ei);
}
///
/// Returns an expression that can be used to invoke operator true
/// on the expression if it exists.
///
static public StaticCallExpr GetOperatorTrue (EmitContext ec, Expression e, Location loc)
{
return GetOperatorTrueOrFalse (ec, e, true, loc);
}
///
/// Returns an expression that can be used to invoke operator false
/// on the expression if it exists.
///
static public StaticCallExpr GetOperatorFalse (EmitContext ec, Expression e, Location loc)
{
return GetOperatorTrueOrFalse (ec, e, false, loc);
}
static StaticCallExpr GetOperatorTrueOrFalse (EmitContext ec, Expression e, bool is_true, Location loc)
{
MethodBase method;
Expression operator_group;
operator_group = MethodLookup (ec, e.Type, is_true ? "op_True" : "op_False", loc);
if (operator_group == null)
return null;
ArrayList arguments = new ArrayList ();
arguments.Add (new Argument (e, Argument.AType.Expression));
method = Invocation.OverloadResolve (
ec, (MethodGroupExpr) operator_group, arguments, false, loc);
if (method == null)
return null;
return new StaticCallExpr ((MethodInfo) method, arguments, loc);
}
///
/// Resolves the expression `e' into a boolean expression: either through
/// an implicit conversion, or through an `operator true' invocation
///
public static Expression ResolveBoolean (EmitContext ec, Expression e, Location loc)
{
e = e.Resolve (ec);
if (e == null)
return null;
Expression converted = e;
if (e.Type != TypeManager.bool_type)
converted = Convert.ImplicitConversion (ec, e, TypeManager.bool_type, new Location (-1));
//
// If no implicit conversion to bool exists, try using `operator true'
//
if (converted == null){
Expression operator_true = Expression.GetOperatorTrue (ec, e, loc);
if (operator_true == null){
Report.Error (
31, loc, "Can not convert the expression to a boolean");
return null;
}
e = operator_true;
} else
e = converted;
return e;
}
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 Error_UnexpectedKind (string expected)
{
string kind = "Unknown";
kind = ExprClassName (eclass);
Error (118, "Expression denotes a `" + kind +
"' where a `" + expected + "' was expected");
}
public void Error_UnexpectedKind (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 public void Error_ConstantValueCannotBeConverted (Location l, string val, Type t)
{
Report.Error (31, l, "Constant value `" + val + "' cannot be converted to " +
TypeManager.CSharpName (t));
}
public static void UnsafeError (Location loc)
{
Report.Error (214, loc, "Pointers may only be used in an unsafe context");
}
///
/// Converts the IntConstant, UIntConstant, LongConstant or
/// ULongConstant into the integral target_type. Notice
/// that we do not return an `Expression' we do return
/// a boxed integral type.
///
/// FIXME: Since I added the new constants, we need to
/// also support conversions from CharConstant, ByteConstant,
/// SByteConstant, UShortConstant, ShortConstant
///
/// This is used by the switch statement, so the domain
/// of work is restricted to the literals above, and the
/// targets are int32, uint32, char, byte, sbyte, ushort,
/// short, uint64 and int64
///
public static object ConvertIntLiteral (Constant c, Type target_type, Location loc)
{
if (!Convert.ImplicitStandardConversionExists (c, target_type)){
Convert.Error_CannotImplicitConversion (loc, c.Type, target_type);
return null;
}
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 if (t.IsPointer)
ig.Emit (OpCodes.Ldind_I);
else
ig.Emit (OpCodes.Ldind_Ref);
}
//
// The stack contains the pointer and the value of type `type'
//
public static void StoreFromPtr (ILGenerator ig, Type type)
{
if (TypeManager.IsEnumType (type))
type = TypeManager.EnumToUnderlying (type);
if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
ig.Emit (OpCodes.Stind_I4);
else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
ig.Emit (OpCodes.Stind_I8);
else if (type == TypeManager.char_type || type == TypeManager.short_type ||
type == TypeManager.ushort_type)
ig.Emit (OpCodes.Stind_I2);
else if (type == TypeManager.float_type)
ig.Emit (OpCodes.Stind_R4);
else if (type == TypeManager.double_type)
ig.Emit (OpCodes.Stind_R8);
else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
type == TypeManager.bool_type)
ig.Emit (OpCodes.Stind_I1);
else if (type == TypeManager.intptr_type)
ig.Emit (OpCodes.Stind_I);
else if (type.IsValueType)
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 = Convert.ImplicitConversion (ec, source, TypeManager.int32_type, loc);
if (target == null){
target = Convert.ImplicitConversion (ec, source, TypeManager.uint32_type, loc);
if (target == null){
target = Convert.ImplicitConversion (ec, source, TypeManager.int64_type, loc);
if (target == null){
target = Convert.ImplicitConversion (ec, source, TypeManager.uint64_type, loc);
if (target == null)
Convert.Error_CannotImplicitConversion (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 {
public virtual ExpressionStatement ResolveStatement (EmitContext ec)
{
Expression e = Resolve (ec);
if (e == null)
return null;
ExpressionStatement es = e as ExpressionStatement;
if (es == null)
Error (201, "Only assignment, call, increment, decrement and new object " +
"expressions can be used as a statement");
return es;
}
///
/// Requests the expression to be emitted in a `statement'
/// context. This means that no new value is left on the
/// stack after invoking this method (constrasted with
/// Emit that will always leave a value on the stack).
///
public abstract void EmitStatement (EmitContext ec);
}
///
/// This kind of cast is used to encapsulate the child
/// whose type is child.Type into an expression that is
/// reported to return "return_type". This is used to encapsulate
/// expressions which have compatible types, but need to be dealt
/// at higher levels with.
///
/// For example, a "byte" expression could be encapsulated in one
/// of these as an "unsigned int". The type for the expression
/// would be "unsigned int".
///
///
public class EmptyCast : Expression {
protected Expression child;
public Expression Child {
get {
return 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);
}
}
//
// We need to special case this since an empty cast of
// a NullLiteral is still a Constant
//
public class NullCast : Constant {
protected Expression child;
public NullCast (Expression child, Type return_type)
{
eclass = child.eclass;
type = return_type;
this.child = child;
}
override public string AsString ()
{
return "null";
}
public override object GetValue ()
{
return null;
}
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 BoxedCast (Expression expr, Type target_type)
: base (expr, target_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 string ToString ()
{
return String.Format ("ConvCast ({0}, {1})", mode, child);
}
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 {
public string Name;
public int NumTypeArguments;
//
// If true, then we are a simple name, not composed with a ".
//
bool is_base;
public SimpleName (string a, string b, Location l)
{
Name = String.Concat (a, ".", b);
loc = l;
is_base = false;
}
public SimpleName (string name, Location l)
{
Name = name;
loc = l;
is_base = true;
}
public SimpleName (string name, int num_type_arguments, Location l)
{
Name = name;
NumTypeArguments = num_type_arguments;
loc = l;
is_base = true;
}
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 override Expression ResolveAsTypeStep (EmitContext ec)
{
DeclSpace ds = ec.DeclSpace;
NamespaceEntry ns = ds.NamespaceEntry;
Type t;
string alias_value;
//
// Since we are cheating: we only do the Alias lookup for
// namespaces if the name does not include any dots in it
//
if (ns != null && is_base)
alias_value = ns.LookupAlias (Name);
else
alias_value = null;
TypeParameterExpr generic_type = ds.LookupGeneric (Name, loc);
if (generic_type != null)
return generic_type.ResolveAsTypeTerminal (ec);
if (ec.ResolvingTypeTree){
int errors = Report.Errors;
Type dt = ds.FindType (loc, Name, NumTypeArguments);
if (Report.Errors != errors)
return null;
if (dt != null)
return new TypeExpression (dt, loc);
if (alias_value != null){
if ((t = RootContext.LookupType (ds, alias_value, true, NumTypeArguments, loc)) != null)
return new TypeExpression (t, loc);
}
}
//
// First, the using aliases
//
if (alias_value != null){
if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
return new TypeExpression (t, loc);
// we have alias value, but it isn't Type, so try if it's namespace
return new SimpleName (alias_value, loc);
}
//
// Stage 2: Lookup up if we are an alias to a type
// or a namespace.
//
if ((t = RootContext.LookupType (ds, Name, true, NumTypeArguments, loc)) != null)
return new TypeExpression (t, 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 (current_block != null){
LocalInfo vi = current_block.GetLocalInfo (Name);
if (vi != null){
Expression var;
var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
if (right_side != null)
return var.ResolveLValue (ec, right_side);
else
return var.Resolve (ec);
}
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, current_block, idx, Name, loc);
if (right_side != null)
return param.ResolveLValue (ec, right_side);
else
return param.Resolve (ec);
}
}
//
// Stage 2: Lookup members
//
DeclSpace lookup_ds = ec.DeclSpace;
do {
if (lookup_ds.TypeBuilder == null)
break;
e = MemberLookup (ec, lookup_ds.TypeBuilder,
Name, NumTypeArguments, loc);
if (e != null)
break;
lookup_ds =lookup_ds.Parent;
} while (lookup_ds != null);
if (e == null && ec.ContainerType != null)
e = MemberLookup (ec, ec.ContainerType,
Name, NumTypeArguments, loc);
if (e == null) {
//
// Since we are cheating (is_base is our hint
// that we are the beginning of the name): we
// only do the Alias lookup for namespaces if
// the name does not include any dots in it
//
NamespaceEntry ns = ec.DeclSpace.NamespaceEntry;
if (is_base && ns != null){
string alias_value = ns.LookupAlias (Name);
if (alias_value != null){
Name = alias_value;
Type t;
if ((t = TypeManager.LookupType (Name)) != null)
return new TypeExpression (t, loc);
// No match, maybe our parent can compose us
// into something meaningful.
return this;
}
}
return ResolveAsTypeStep (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;
if (!me.IsStatic &&
TypeManager.IsNestedChildOf (me.InstanceExpression.Type, me.DeclaringType) &&
!me.InstanceExpression.Type.IsSubclassOf (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 (103, "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 abstract class TypeExpr : Expression {
override public Expression ResolveAsTypeStep (EmitContext ec)
{
TypeExpr t = DoResolveAsTypeStep (ec);
if (t == null)
return null;
eclass = ExprClass.Type;
return t;
}
override public Expression DoResolve (EmitContext ec)
{
return ResolveAsTypeTerminal (ec);
}
override public void Emit (EmitContext ec)
{
throw new Exception ("Should never be called");
}
public virtual bool CheckAccessLevel (DeclSpace ds)
{
return ds.CheckAccessLevel (Type);
}
public virtual bool AsAccessible (DeclSpace ds, int flags)
{
return ds.AsAccessible (Type, flags);
}
public virtual bool IsClass {
get { return Type.IsClass; }
}
public virtual bool IsValueType {
get { return Type.IsValueType; }
}
public virtual bool IsInterface {
get { return Type.IsInterface; }
}
public virtual bool IsSealed {
get { return Type.IsSealed; }
}
public virtual bool CanInheritFrom ()
{
if (Type == TypeManager.enum_type ||
(Type == TypeManager.value_type && RootContext.StdLib) ||
Type == TypeManager.delegate_type ||
Type == TypeManager.array_type)
return false;
return true;
}
public virtual bool IsAttribute {
get {
return Type == TypeManager.attribute_type ||
Type.IsSubclassOf (TypeManager.attribute_type);
}
}
public virtual TypeExpr[] GetInterfaces ()
{
return TypeManager.GetInterfaces (Type);
}
public abstract TypeExpr DoResolveAsTypeStep (EmitContext ec);
public virtual Type ResolveType (EmitContext ec)
{
TypeExpr t = ResolveAsTypeTerminal (ec);
if (t == null)
return null;
return t.Type;
}
public abstract string Name {
get;
}
public override bool Equals (object obj)
{
TypeExpr tobj = obj as TypeExpr;
if (tobj == null)
return false;
return Type == tobj.Type;
}
public override string ToString ()
{
return Name;
}
}
public class TypeExpression : TypeExpr {
public TypeExpression (Type t, Location l)
{
Type = t;
eclass = ExprClass.Type;
loc = l;
}
public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
return this;
}
public override string Name {
get {
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)
{
this.name = name;
}
public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
if (type == null)
type = RootContext.LookupType (ec.DeclSpace, name, false, Location.Null);
return this;
}
public override string Name {
get {
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;
bool has_type_arguments = 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 {
//
// We assume that the top-level type is in the end
//
return Methods [Methods.Length - 1].DeclaringType;
//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 bool HasTypeArguments {
get {
return has_type_arguments;
}
set {
has_type_arguments = value;
}
}
public string Name {
get {
return TypeManager.CSharpSignature (
Methods [Methods.Length - 1]);
}
}
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 (!IsInstance)
instance_expression = null;
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 `" + DeclaringType + "." +
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, IVariable {
public readonly FieldInfo FieldInfo;
Expression instance_expr;
VariableInfo variable_info;
public FieldExpr (FieldInfo fi, Location l)
{
FieldInfo = fi;
eclass = ExprClass.Variable;
type = TypeManager.TypeToCoreType (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;
}
}
public VariableInfo VariableInfo {
get {
return variable_info;
}
}
override public Expression DoResolve (EmitContext ec)
{
if (!FieldInfo.IsStatic){
if (instance_expr == null){
//
// This can happen when referencing an instance field using
// a fully qualified type expression: TypeName.InstanceField = xxx
//
SimpleName.Error_ObjectRefRequired (ec, loc, FieldInfo.Name);
return null;
}
// Resolve the field's instance expression while flow analysis is turned
// off: when accessing a field "a.b", we must check whether the field
// "a.b" is initialized, not whether the whole struct "a" is initialized.
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.VariableInfo == null))
return this;
VariableInfo vi = var.VariableInfo;
if (!vi.IsFieldAssigned (ec, FieldInfo.Name, loc))
return null;
variable_info = vi.GetSubStruct (FieldInfo.Name);
return this;
}
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.VariableInfo != null))
var.VariableInfo.SetFieldAssigned (ec, FieldInfo.Name);
Expression e = DoResolve (ec);
if (e == null)
return null;
if (!FieldInfo.IsStatic && (instance_expr.Type.IsValueType && !(instance_expr is IMemoryLocation))) {
// FIXME: Provide better error reporting.
Error (1612, "Cannot modify expression because it is not a variable.");
return null;
}
if (!FieldInfo.IsInitOnly)
return this;
FieldBase fb = TypeManager.GetField (FieldInfo);
if (fb != null)
fb.SetAssigned ();
//
// InitOnly fields can only be assigned in constructors
//
if (ec.IsConstructor){
if (IsStatic && !ec.IsStatic)
Report_AssignToReadonly (false);
Type ctype;
if (ec.TypeContainer.CurrentType != null)
ctype = ec.TypeContainer.CurrentType.ResolveType (ec);
else
ctype = ec.ContainerType;
if (TypeManager.IsEqual (ctype, FieldInfo.DeclaringType))
return this;
}
Report_AssignToReadonly (true);
return null;
}
public bool VerifyFixed (bool is_expression)
{
IVariable variable = instance_expr as IVariable;
if ((variable == null) || !variable.VerifyFixed (true))
return false;
return true;
}
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 != null){
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);
return;
}
if (instance_expr.Type.IsValueType){
IMemoryLocation ml;
LocalTemporary tempo = null;
if (!(instance_expr is IMemoryLocation)){
tempo = new LocalTemporary (ec, instance_expr.Type);
if (ec.RemapToProxy)
ec.EmitThis ();
InstanceExpression.Emit (ec);
tempo.Store (ec);
ml = tempo;
} else
ml = (IMemoryLocation) instance_expr;
ml.AddressOf (ec, AddressOp.Load);
} else {
if (ec.RemapToProxy)
ec.EmitThis ();
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){
IMemoryLocation ml = (IMemoryLocation) instance;
ml.AddressOf (ec, AddressOp.Store);
} else {
if (ec.RemapToProxy)
ec.EmitThis ();
else
instance.Emit (ec);
}
}
source.Emit (ec);
if (FieldInfo is FieldBuilder){
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null){
if ((f.ModFlags & Modifiers.VOLATILE) != 0)
ig.Emit (OpCodes.Volatile);
f.status |= Field.Status.ASSIGNED;
}
}
if (is_static)
ig.Emit (OpCodes.Stsfld, FieldInfo);
else
ig.Emit (OpCodes.Stfld, FieldInfo);
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
ILGenerator ig = ec.ig;
if (FieldInfo is FieldBuilder){
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null){
if ((f.ModFlags & Modifiers.VOLATILE) != 0){
Error (676, "volatile variable: can not take its address, or pass as ref/out parameter");
return;
}
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.
//
bool need_copy;
if (FieldInfo.IsInitOnly){
need_copy = true;
if (ec.IsConstructor){
if (FieldInfo.IsStatic){
if (ec.IsStatic)
need_copy = false;
} else
need_copy = false;
}
} else
need_copy = false;
if (need_copy){
LocalBuilder local;
Emit (ec);
local = ig.DeclareLocal (type);
ig.Emit (OpCodes.Stloc, local);
ig.Emit (OpCodes.Ldloca, local);
return;
}
if (FieldInfo.IsStatic){
ig.Emit (OpCodes.Ldsflda, FieldInfo);
} else {
//
// In the case of `This', we call the AddressOf method, which will
// only load the pointer, and not perform an Ldobj immediately after
// the value has been loaded into the stack.
//
if (instance_expr is This)
((This)instance_expr).AddressOf (ec, AddressOp.LoadStore);
else if (instance_expr.Type.IsValueType && instance_expr is IMemoryLocation){
IMemoryLocation ml = (IMemoryLocation) instance_expr;
ml.AddressOf (ec, AddressOp.LoadStore);
} else
instance_expr.Emit (ec);
ig.Emit (OpCodes.Ldflda, FieldInfo);
}
}
}
//
// A FieldExpr whose address can not be taken
//
public class FieldExprNoAddress : FieldExpr, IMemoryLocation {
public FieldExprNoAddress (FieldInfo fi, Location loc) : base (fi, loc)
{
}
public new void AddressOf (EmitContext ec, AddressOp mode)
{
Report.Error (-215, "Report this: Taking the address of a remapped parameter not supported");
}
}
///
/// Expression that evaluates to a Property. The Assign class
/// might set the `Value' expression if we are in an assignment.
///
/// This is not an LValue because we need to re-write the expression, we
/// can not take data from the stack and store it.
///
public class PropertyExpr : ExpressionStatement, IAssignMethod, IMemberExpr {
public readonly PropertyInfo PropertyInfo;
//
// This is set externally by the `BaseAccess' class
//
public bool IsBase;
MethodInfo getter, setter;
bool is_static;
bool must_do_cs1540_check;
Expression instance_expr;
public PropertyExpr (EmitContext ec, PropertyInfo pi, Location l)
{
PropertyInfo = pi;
eclass = ExprClass.PropertyAccess;
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 (setter == null) {
Report.Error (200, loc,
"The property `" + PropertyInfo.Name +
"' can not be assigned to, as it has not set accessor");
return false;
}
return true;
}
MethodInfo GetAccessor (Type invocation_type, string accessor_name)
{
BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic |
BindingFlags.Static | BindingFlags.Instance;
MemberInfo[] group;
group = TypeManager.MemberLookup (
invocation_type, invocation_type, PropertyInfo.DeclaringType,
0, MemberTypes.Method, flags, accessor_name + "_" + PropertyInfo.Name);
//
// The first method is the closest to us
//
if (group == null)
return null;
foreach (MethodInfo mi in group) {
MethodAttributes ma = mi.Attributes & MethodAttributes.MemberAccessMask;
//
// If only accessible to the current class or children
//
if (ma == MethodAttributes.Private) {
Type declaring_type = mi.DeclaringType;
if (invocation_type != declaring_type){
if (TypeManager.IsSubclassOrNestedChildOf (invocation_type, mi.DeclaringType))
return mi;
else
continue;
} else
return mi;
}
//
// FamAndAssem requires that we not only derivate, but we are on the
// same assembly.
//
if (ma == MethodAttributes.FamANDAssem){
if (mi.DeclaringType.Assembly != invocation_type.Assembly)
continue;
else
return mi;
}
// Assembly and FamORAssem succeed if we're in the same assembly.
if ((ma == MethodAttributes.Assembly) || (ma == MethodAttributes.FamORAssem)){
if (mi.DeclaringType.Assembly == invocation_type.Assembly)
return mi;
}
// We already know that we aren't in the same assembly.
if (ma == MethodAttributes.Assembly)
continue;
// Family and FamANDAssem require that we derive.
if ((ma == MethodAttributes.Family) || (ma == MethodAttributes.FamANDAssem) || (ma == MethodAttributes.FamORAssem)){
if (!TypeManager.IsSubclassOrNestedChildOf (invocation_type, mi.DeclaringType))
continue;
else {
must_do_cs1540_check = true;
return mi;
}
}
return mi;
}
return null;
}
//
// We also perform the permission checking here, as the PropertyInfo does not
// hold the information for the accessibility of its setter/getter
//
void ResolveAccessors (EmitContext ec)
{
getter = GetAccessor (ec.ContainerType, "get");
if ((getter != null) && getter.IsStatic)
is_static = true;
setter = GetAccessor (ec.ContainerType, "set");
if ((setter != null) && setter.IsStatic)
is_static = true;
if (setter == null && getter == null){
Error (122, "`" + PropertyInfo.Name + "' " +
"is inaccessible because of its protection level");
}
}
bool InstanceResolve (EmitContext ec)
{
if ((instance_expr == null) && ec.IsStatic && !is_static) {
SimpleName.Error_ObjectRefRequired (ec, loc, PropertyInfo.Name);
return false;
}
if (instance_expr != null) {
instance_expr = instance_expr.DoResolve (ec);
if (instance_expr == null)
return false;
}
if (must_do_cs1540_check && (instance_expr != null)) {
if ((instance_expr.Type != ec.ContainerType) &&
ec.ContainerType.IsSubclassOf (instance_expr.Type)) {
Report.Error (1540, loc, "Cannot access protected member `" +
PropertyInfo.DeclaringType + "." + PropertyInfo.Name +
"' via a qualifier of type `" +
TypeManager.CSharpName (instance_expr.Type) +
"'; the qualifier must be of type `" +
TypeManager.CSharpName (ec.ContainerType) +
"' (or derived from it)");
return false;
}
}
return true;
}
override public Expression DoResolve (EmitContext ec)
{
if (getter == null){
//
// The following condition happens if the PropertyExpr was
// created, but is invalid (ie, the property is inaccessible),
// and we did not want to embed the knowledge about this in
// the caller routine. This only avoids double error reporting.
//
if (setter == null)
return null;
Report.Error (154, loc,
"The property `" + PropertyInfo.Name +
"' can not be used in " +
"this context because it lacks a get accessor");
return null;
}
if (!InstanceResolve (ec))
return null;
//
// Only base will allow this invocation to happen.
//
if (IsBase && getter.IsAbstract){
Report.Error (205, loc, "Cannot call an abstract base property: " +
PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
return null;
}
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (setter == null){
//
// The following condition happens if the PropertyExpr was
// created, but is invalid (ie, the property is inaccessible),
// and we did not want to embed the knowledge about this in
// the caller routine. This only avoids double error reporting.
//
if (getter == null)
return null;
Report.Error (154, loc,
"The property `" + PropertyInfo.Name +
"' can not be used in " +
"this context because it lacks a set accessor");
return null;
}
if (!InstanceResolve (ec))
return null;
//
// Only base will allow this invocation to happen.
//
if (IsBase && setter.IsAbstract){
Report.Error (205, loc, "Cannot call an abstract base property: " +
PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
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);
ec.ig.Emit (OpCodes.Conv_I4);
return;
}
}
Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, getter, null, 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 ();
args.Add (arg);
Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, setter, args, 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){
MyEventBuilder eb = (MyEventBuilder) EventInfo;
type = eb.EventType;
eb.SetUsed ();
} 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)
{
BinaryDelegate source_del = (BinaryDelegate) source;
Expression handler = source_del.Right;
Argument arg = new Argument (handler, Argument.AType.Expression);
ArrayList args = new ArrayList ();
args.Add (arg);
if (source_del.IsAddition)
Invocation.EmitCall (
ec, false, IsStatic, instance_expr, add_accessor, args, loc);
else
Invocation.EmitCall (
ec, false, IsStatic, instance_expr, remove_accessor, args, loc);
}
}
}