//
// 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,
// Mask of all the expression class flags.
MaskExprClass = 7,
// Disable control flow analysis while resolving the expression.
// This is used when resolving the instance expression of a field expression.
DisableFlowAnalysis = 8,
// Set if this is resolving the first part of a MemberAccess.
Intermediate = 16
}
//
// 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);
}
///
/// We are either a namespace or a type.
/// If we're a type, `IsType' is true and we may use `Type' to get
/// a TypeExpr representing that type.
///
public interface IAlias {
bool IsType {
get;
}
string Name {
get;
}
TypeExpr ResolveAsType (EmitContext ec);
}
///
/// 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 code, string format, params object[] args)
{
Report.Warning (code, loc, format, args);
}
// Not nice but we have broken hierarchy
public virtual void CheckMarshallByRefAccess (Type container) {}
///
/// Tests presence of ObsoleteAttribute and report proper error
///
protected void CheckObsoleteAttribute (Type type)
{
ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
if (obsolete_attr == null)
return;
AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, loc);
}
public static bool IsAccessorAccessible (Type invocation_type, MethodInfo mi, out bool must_do_cs1540_check)
{
MethodAttributes ma = mi.Attributes & MethodAttributes.MemberAccessMask;
must_do_cs1540_check = false; // by default we do not check for this
//
// If only accessible to the current class or children
//
if (ma == MethodAttributes.Private) {
Type declaring_type = mi.DeclaringType;
if (invocation_type != declaring_type)
return TypeManager.IsNestedChildOf (invocation_type, declaring_type);
return true;
}
//
// FamAndAssem requires that we not only derivate, but we are on the
// same assembly.
//
if (ma == MethodAttributes.FamANDAssem){
return (mi.DeclaringType.Assembly != invocation_type.Assembly);
}
// 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 true;
}
// We already know that we aren't in the same assembly.
if (ma == MethodAttributes.Assembly)
return false;
// Family and FamANDAssem require that we derive.
if ((ma == MethodAttributes.Family) || (ma == MethodAttributes.FamANDAssem) || (ma == MethodAttributes.FamORAssem)){
if (!TypeManager.IsNestedFamilyAccessible (invocation_type, mi.DeclaringType))
return false;
if (!TypeManager.IsNestedChildOf (invocation_type, mi.DeclaringType))
must_do_cs1540_check = true;
return true;
}
return true;
}
///
/// Performs semantic analysis on the Expression
///
///
///
/// The Resolve method is invoked to perform the semantic analysis
/// on the node.
///
/// The return value is an expression (it can be the
/// same expression in some cases) or a new
/// expression that better represents this node.
///
/// For example, optimizations of Unary (LiteralInt)
/// would return a new LiteralInt with a negated
/// value.
///
/// If there is an error during semantic analysis,
/// then an error should be reported (using Report)
/// and a null value should be returned.
///
/// There are two side effects expected from calling
/// Resolve(): the the field variable "eclass" should
/// be set to any value of the enumeration
/// `ExprClass' and the type variable should be set
/// to a valid type (this is the type of the
/// expression).
///
public abstract Expression DoResolve (EmitContext ec);
public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return null;
}
//
// This is used if the expression should be resolved as a type or namespace name.
// the default implementation fails.
//
public virtual FullNamedExpression ResolveAsTypeStep (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, bool silent)
{
int errors = Report.Errors;
FullNamedExpression fne = ResolveAsTypeStep (ec);
if (fne == null) {
if (!silent && errors == Report.Errors)
Report.Error (246, Location, "Cannot find type '{0}'", ToString ());
return null;
}
if (fne.eclass != ExprClass.Type) {
if (!silent && errors == Report.Errors)
Report.Error (118, Location, "'{0}' denotes a '{1}', where a type was expected",
fne.FullName, fne.ExprClassName ());
return null;
}
TypeExpr te = fne as TypeExpr;
if (!te.CheckAccessLevel (ec.DeclSpace)) {
Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", te.Name);
return null;
}
return te;
}
///
/// 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;
bool intermediate = (flags & ResolveFlags.Intermediate) == ResolveFlags.Intermediate;
if (this is SimpleName)
e = ((SimpleName) this).DoResolveAllowStatic (ec, intermediate);
else
e = DoResolve (ec);
ec.DoFlowAnalysis = old_do_flow_analysis;
if (e == null)
return null;
if ((e is TypeExpr) || (e is ComposedCast) || (e is Namespace)) {
if ((flags & ResolveFlags.Type) == 0) {
e.Error_UnexpectedKind (flags, loc);
return null;
}
return e;
}
switch (e.eclass) {
case ExprClass.Type:
case ExprClass.Namespace:
if ((flags & ResolveFlags.VariableOrValue) == 0) {
e.Error_UnexpectedKind (flags, loc);
return null;
}
break;
case ExprClass.MethodGroup:
if (RootContext.Version == LanguageVersion.ISO_1){
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, loc);
return null;
}
break;
default:
throw new Exception ("Expression " + e.GetType () +
" ExprClass is Invalid after resolve");
}
if (e.type == null && !(e is Namespace)) {
throw new Exception (
"Expression " + e.GetType () +
" did not set its type after Resolve\n" +
"called from: " + this.GetType ());
}
return e;
}
///
/// Resolves an expression and performs semantic analysis on it.
///
public Expression Resolve (EmitContext ec)
{
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)
{
int errors = Report.Errors;
Expression e = DoResolveLValue (ec, right_side);
if (e == null) {
if (errors == Report.Errors)
Report.Error (131, Location, "The left-hand side of an assignment or mutating operation must be a variable, property or indexer");
return null;
}
if (e != 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)
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 (t == TypeManager.decimal_type)
return new DecimalConstant ((decimal) v);
else if (TypeManager.IsEnumType (t)){
Type real_type = TypeManager.TypeToCoreType (v.GetType ());
if (real_type == t)
real_type = System.Enum.GetUnderlyingType (real_type);
Constant e = Constantify (v, real_type);
return new EnumConstant (e, t);
} else if (v == null && !TypeManager.IsValueType (t))
return NullLiteral.Null;
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;
}
protected static ArrayList almostMatchedMembers = new ArrayList (4);
//
// FIXME: Probably implement a cache for (t,name,current_access_set)?
//
// This code could use some optimizations, but we need to do some
// measurements. For example, we could use a delegate to `flag' when
// something can not any longer be a method-group (because it is something
// else).
//
// Return values:
// If the return value is an Array, then it is an array of
// MethodBases
//
// If the return value is an MemberInfo, it is anything, but a Method
//
// null on error.
//
// FIXME: When calling MemberLookup inside an `Invocation', we should pass
// the arguments here and have MemberLookup return only the methods that
// match the argument count/type, unlike we are doing now (we delay this
// decision).
//
// This is so we can catch correctly attempts to invoke instance methods
// from a static body (scan for error 120 in ResolveSimpleName).
//
//
// FIXME: Potential optimization, have a static ArrayList
//
public static Expression MemberLookup (EmitContext ec, Type queried_type, string name,
MemberTypes mt, BindingFlags bf, Location loc)
{
return MemberLookup (ec, ec.ContainerType, null, queried_type, name, mt, bf, loc);
}
//
// Lookup type `queried_type' for code in class `container_type' with a qualifier of
// `qualifier_type' or null to lookup members in the current class.
//
public static Expression MemberLookup (EmitContext ec, Type container_type,
Type qualifier_type, Type queried_type,
string name, MemberTypes mt,
BindingFlags bf, Location loc)
{
almostMatchedMembers.Clear ();
MemberInfo [] mi = TypeManager.MemberLookup (container_type, qualifier_type,
queried_type, mt, bf, name, almostMatchedMembers);
if (mi == null)
return null;
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, Location loc)
{
return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
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, 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,
MemberTypes.Method, AllBindingFlags, loc);
}
///
/// This is a wrapper for MemberLookup that is not used to "probe", but
/// to find a final definition. If the final definition is not found, we
/// look for private members and display a useful debugging message if we
/// find it.
///
public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
Type queried_type, string name, Location loc)
{
return MemberLookupFinal (ec, qualifier_type, queried_type, name,
AllMemberTypes, AllBindingFlags, loc);
}
public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
Type queried_type, string name,
MemberTypes mt, BindingFlags bf,
Location loc)
{
Expression e;
int errors = Report.Errors;
e = MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type, name, mt, bf, loc);
if (e == null && errors == Report.Errors)
// No errors were reported by MemberLookup, but there was an error.
MemberLookupFailed (ec, qualifier_type, queried_type, name, null, true, loc);
return e;
}
public static void MemberLookupFailed (EmitContext ec, Type qualifier_type,
Type queried_type, string name,
string class_name, bool complain_if_none_found,
Location loc)
{
if (almostMatchedMembers.Count != 0) {
if (qualifier_type == null) {
foreach (MemberInfo m in almostMatchedMembers)
Report.Error (38, loc,
"Cannot access non-static member `{0}' via nested type `{1}'",
TypeManager.GetFullNameSignature (m),
TypeManager.CSharpName (ec.ContainerType));
return;
}
if (qualifier_type != ec.ContainerType) {
// Although a derived class can access protected members of
// its base class it cannot do so through an instance of the
// base class (CS1540). If the qualifier_type is a base of the
// ec.ContainerType and the lookup succeeds with the latter one,
// then we are in this situation.
for (int i = 0; i < almostMatchedMembers.Count; ++i) {
MemberInfo m = (MemberInfo) almostMatchedMembers [i];
for (int j = 0; j < i; ++j) {
if (m == almostMatchedMembers [j]) {
m = null;
break;
}
}
if (m == null)
continue;
Report.SymbolRelatedToPreviousError (m);
Report.Error (1540, loc,
"Cannot access protected member `{0}' via a qualifier of type `{1}';"
+ " the qualifier must be of type `{2}' (or derived from it)",
TypeManager.GetFullNameSignature (m),
TypeManager.CSharpName (qualifier_type),
TypeManager.CSharpName (ec.ContainerType));
}
return;
}
almostMatchedMembers.Clear ();
}
object lookup = TypeManager.MemberLookup (queried_type, null, queried_type,
AllMemberTypes, AllBindingFlags |
BindingFlags.NonPublic, name, null);
if (lookup == null) {
if (!complain_if_none_found)
return;
if (class_name != null)
Report.Error (103, loc, "The name `" + name + "' could not be " +
"found in `" + class_name + "'");
else
Report.Error (
117, loc, "`" + queried_type + "' does not contain a " +
"definition for `" + name + "'");
return;
}
if (name == ".ctor" && TypeManager.FindMembers (qualifier_type, MemberTypes.Constructor,
BindingFlags.Static | BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly, null, null).Count == 0)
{
Report.Error (143, loc, String.Format ("The type '{0}' has no constructors defined", TypeManager.CSharpName (queried_type)));
return;
}
if (qualifier_type != null) {
Report.Error (122, loc, "'{0}' is inaccessible due to its protection level", TypeManager.CSharpName (qualifier_type) + "." + name);
} else {
Report.Error (122, loc, "'{0}' is inaccessible due to its protection level", name);
}
}
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;
if (e.Type == TypeManager.bool_type)
return e;
Expression converted = Convert.ImplicitConversion (ec, e, TypeManager.bool_type, new Location (-1));
if (converted != null)
return converted;
//
// If no implicit conversion to bool exists, try using `operator true'
//
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;
}
return operator_true;
}
public string ExprClassName ()
{
switch (eclass){
case ExprClass.Invalid:
return "Invalid";
case ExprClass.Value:
return "value";
case ExprClass.Variable:
return "variable";
case ExprClass.Namespace:
return "namespace";
case ExprClass.Type:
return "type";
case ExprClass.MethodGroup:
return "method group";
case ExprClass.PropertyAccess:
return "property access";
case ExprClass.EventAccess:
return "event access";
case ExprClass.IndexerAccess:
return "indexer access";
case ExprClass.Nothing:
return "null";
}
throw new Exception ("Should not happen");
}
///
/// Reports that we were expecting `expr' to be of class `expected'
///
public void Error_UnexpectedKind (string expected, Location loc)
{
Report.Error (118, loc, "Expression denotes a `" + ExprClassName () +
"' where a `" + expected + "' was expected");
}
public void Error_UnexpectedKind (ResolveFlags flags, Location loc)
{
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 (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]);
}
Report.Error (119, loc, "Expression denotes a `" + ExprClassName () + "' 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 (Convert.ConstantEC, 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;
}
public static void Error_NegativeArrayIndex (Location loc)
{
Report.Error (248, loc, "Cannot create an 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;
loc = child.Location;
type = return_type;
this.child = child;
}
public override Expression DoResolve (EmitContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
child.Emit (ec);
}
}
//
// 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);
}
public override bool IsDefaultValue {
get {
throw new NotImplementedException ();
}
}
public override bool IsNegative {
get {
return false;
}
}
}
///
/// 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 ();
}
public object GetValueAsEnumType ()
{
return System.Enum.ToObject (type, 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 ();
}
public override bool IsDefaultValue {
get {
return Child.IsDefaultValue;
}
}
public override bool IsZeroInteger {
get { return Child.IsZeroInteger; }
}
public override bool IsNegative {
get {
return Child.IsNegative;
}
}
}
///
/// 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)
{
eclass = ExprClass.Value;
}
public BoxedCast (Expression expr, Type target_type)
: base (expr, target_type)
{
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
ec.ig.Emit (OpCodes.Box, child.Type);
}
}
public class UnboxCast : EmptyCast {
public UnboxCast (Expression expr, Type return_type)
: base (expr, return_type)
{
}
public override Expression DoResolve (EmitContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override 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 formed of a single word and only happen at the beginning
/// of a dotted-name.
///
public class SimpleName : Expression {
public 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, false);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return SimpleNameResolve (ec, right_side, false, false);
}
public Expression DoResolveAllowStatic (EmitContext ec, bool intermediate)
{
return SimpleNameResolve (ec, null, true, intermediate);
}
public override FullNamedExpression ResolveAsTypeStep (EmitContext ec)
{
int errors = Report.Errors;
FullNamedExpression dt = ec.DeclSpace.LookupType (
Name, loc, /*silent=*/ true, /*ignore_cs0104=*/ false);
if (Report.Errors != errors)
return null;
return dt;
}
Expression SimpleNameResolve (EmitContext ec, Expression right_side,
bool allow_static, bool intermediate)
{
Expression e = DoSimpleNameResolve (ec, right_side, allow_static, intermediate);
if (e == null)
return null;
Block current_block = ec.CurrentBlock;
if (current_block != null){
if (current_block.IsVariableNameUsedInChildBlock (Name)) {
Report.Error (135, Location,
"'{0}' has a different meaning in a child block", Name);
return null;
}
}
return e;
}
///
/// 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 DoSimpleNameResolve (EmitContext ec, Expression right_side, bool allow_static, bool intermediate)
{
Expression e = null;
//
// Stage 1: Performed by the parser (binding to locals or parameters).
//
Block current_block = ec.CurrentBlock;
if (current_block != null){
LocalInfo vi = current_block.GetLocalInfo (Name);
if (vi != null){
Expression var;
var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
if (right_side != null)
return var.ResolveLValue (ec, right_side);
else
return var.Resolve (ec);
}
ParameterReference pref = current_block.GetParameterReference (Name, loc);
if (pref != null) {
if (right_side != null)
return pref.ResolveLValue (ec, right_side);
else
return pref.Resolve (ec);
}
}
//
// Stage 2: Lookup members
//
DeclSpace lookup_ds = ec.DeclSpace;
Type almost_matched_type = null;
ArrayList almost_matched = null;
do {
if (lookup_ds.TypeBuilder == null)
break;
e = MemberLookup (ec, lookup_ds.TypeBuilder, Name, loc);
if (e != null)
break;
if (almost_matched == null && almostMatchedMembers.Count > 0) {
almost_matched_type = lookup_ds.TypeBuilder;
almost_matched = (ArrayList) almostMatchedMembers.Clone ();
}
lookup_ds =lookup_ds.Parent;
} while (lookup_ds != null);
if (e == null && ec.ContainerType != null)
e = MemberLookup (ec, ec.ContainerType, Name, loc);
if (e == null) {
if (almost_matched == null && almostMatchedMembers.Count > 0) {
almost_matched_type = ec.ContainerType;
almost_matched = (ArrayList) almostMatchedMembers.Clone ();
}
e = ResolveAsTypeStep (ec);
}
if (e == null) {
if (almost_matched != null)
almostMatchedMembers = almost_matched;
if (almost_matched_type == null)
almost_matched_type = ec.ContainerType;
MemberLookupFailed (ec, null, almost_matched_type, ((SimpleName) this).Name, ec.DeclSpace.Name, true, loc);
return null;
}
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.IsNestedFamilyAccessible (me.InstanceExpression.Type, me.DeclaringType) &&
me.InstanceExpression.Type != me.DeclaringType &&
!me.InstanceExpression.Type.IsSubclassOf (me.DeclaringType) &&
(!intermediate || !MemberAccess.IdenticalNameAndTypeName (ec, this, e, loc))) {
Error (38, "Cannot access nonstatic member `" + me.Name + "' of " +
"outer type `" + me.DeclaringType + "' via nested type `" +
me.InstanceExpression.Type + "'");
return null;
}
return (right_side != null)
? e.DoResolveLValue (ec, right_side)
: e.DoResolve (ec);
}
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;
}
}
///
/// Represents a namespace or a type. The name of the class was inspired by
/// section 10.8.1 (Fully Qualified Names).
///
public abstract class FullNamedExpression : Expression {
public override FullNamedExpression ResolveAsTypeStep (EmitContext ec)
{
return this;
}
public abstract string FullName {
get;
}
}
///
/// Fully resolved expression that evaluates to a type
///
public abstract class TypeExpr : FullNamedExpression {
override public FullNamedExpression 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, false);
}
override public void Emit (EmitContext ec)
{
throw new Exception ("Should never be called");
}
public virtual bool CheckAccessLevel (DeclSpace ds)
{
return ds.CheckAccessLevel (Type);
}
public virtual bool AsAccessible (DeclSpace ds, int flags)
{
return ds.AsAccessible (Type, flags);
}
public virtual bool IsClass {
get { return Type.IsClass; }
}
public virtual bool IsValueType {
get { return Type.IsValueType; }
}
public virtual bool IsInterface {
get { return Type.IsInterface; }
}
public virtual bool IsSealed {
get { return Type.IsSealed; }
}
public virtual bool CanInheritFrom ()
{
if (Type == TypeManager.enum_type ||
(Type == TypeManager.value_type && RootContext.StdLib) ||
Type == TypeManager.multicast_delegate_type ||
Type == TypeManager.delegate_type ||
Type == TypeManager.array_type)
return false;
return true;
}
public abstract TypeExpr DoResolveAsTypeStep (EmitContext ec);
public virtual Type ResolveType (EmitContext ec)
{
TypeExpr t = ResolveAsTypeTerminal (ec, false);
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 int GetHashCode ()
{
return Type.GetHashCode ();
}
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 ();
}
}
public override string FullName {
get {
return Type.FullName;
}
}
}
///
/// Used to create types from a fully qualified name. These are just used
/// by the parser to setup the core types. A TypeLookupExpression is always
/// classified as a type.
///
public class TypeLookupExpression : TypeExpr {
string name;
public TypeLookupExpression (string name)
{
this.name = name;
}
public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
if (type == null) {
FullNamedExpression t = ec.DeclSpace.LookupType (
name, Location.Null, /*silent=*/ false, /*ignore_cs0104=*/ false);
if (t == null)
return null;
if (!(t is TypeExpr))
return null;
type = ((TypeExpr) t).ResolveType (ec);
}
return this;
}
public override string Name {
get {
return name;
}
}
public override string FullName {
get {
return name;
}
}
}
public class TypeAliasExpression : TypeExpr {
TypeExpr texpr;
public TypeAliasExpression (TypeExpr texpr, Location l)
{
this.texpr = texpr;
loc = texpr.Location;
eclass = ExprClass.Type;
}
public override string Name {
get { return texpr.Name; }
}
public override string FullName {
get { return texpr.FullName; }
}
public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
Type type = texpr.ResolveType (ec);
if (type == null)
return null;
return new TypeExpression (type, loc);
}
public override bool CheckAccessLevel (DeclSpace ds)
{
return texpr.CheckAccessLevel (ds);
}
public override bool AsAccessible (DeclSpace ds, int flags)
{
return texpr.AsAccessible (ds, flags);
}
public override bool IsClass {
get { return texpr.IsClass; }
}
public override bool IsValueType {
get { return texpr.IsValueType; }
}
public override bool IsInterface {
get { return texpr.IsInterface; }
}
public override bool IsSealed {
get { return texpr.IsSealed; }
}
}
///
/// 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 identical_type_name = false;
bool is_base;
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 {
//
// The methods are arranged in this order:
// derived type -> base type
//
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 IdenticalTypeName {
get {
return identical_type_name;
}
set {
identical_type_name = value;
}
}
public bool IsBase {
get {
return is_base;
}
set {
is_base = 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 (!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;
LocalTemporary temp;
bool prepared;
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;
}
}
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;
}
ObsoleteAttribute oa;
FieldBase f = TypeManager.GetField (FieldInfo);
if (f != null) {
oa = f.GetObsoleteAttribute (f.Parent);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, f.GetSignatureForError (), loc);
// To be sure that type is external because we do not register generated fields
} else if (!(FieldInfo.DeclaringType is TypeBuilder)) {
oa = AttributeTester.GetMemberObsoleteAttribute (FieldInfo);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, TypeManager.GetFullNameSignature (FieldInfo), loc);
}
if (ec.CurrentAnonymousMethod != null){
if (!FieldInfo.IsStatic){
if (ec.TypeContainer is Struct){
Report.Error (1673, loc, "Can not reference instance variables in anonymous methods hosted in structs");
return null;
}
ec.CaptureField (this);
}
}
// 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);
if (ec.ContainerType == FieldInfo.DeclaringType)
return this;
}
Report_AssignToReadonly (!IsStatic);
return null;
}
public override void CheckMarshallByRefAccess (Type container)
{
if (!IsStatic && Type.IsValueType && !container.IsSubclassOf (TypeManager.mbr_type) && DeclaringType.IsSubclassOf (TypeManager.mbr_type)) {
Report.SymbolRelatedToPreviousError (DeclaringType);
Report.Error (1690, loc, "Cannot call '{0}' method, property, or indexer because it is a value type member of a marshal-by-reference class", Name);
}
}
public bool VerifyFixed (bool is_expression)
{
IVariable variable = instance_expr as IVariable;
if ((variable == null) || !variable.VerifyFixed (true))
return false;
return true;
}
public void Emit (EmitContext ec, bool leave_copy)
{
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);
} else {
if (!prepared)
EmitInstance (ec);
if (is_volatile)
ig.Emit (OpCodes.Volatile);
IFixedBuffer ff = AttributeTester.GetFixedBuffer (FieldInfo);
if (ff != null)
{
ig.Emit (OpCodes.Ldflda, FieldInfo);
ig.Emit (OpCodes.Ldflda, ff.Element);
}
else {
ig.Emit (OpCodes.Ldfld, FieldInfo);
}
}
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (!FieldInfo.IsStatic) {
temp = new LocalTemporary (ec, this.Type);
temp.Store (ec);
}
}
}
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
{
FieldAttributes fa = FieldInfo.Attributes;
bool is_static = (fa & FieldAttributes.Static) != 0;
bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
ILGenerator ig = ec.ig;
prepared = prepare_for_load;
if (is_readonly && !ec.IsConstructor){
Report_AssignToReadonly (!is_static);
return;
}
if (!is_static) {
EmitInstance (ec);
if (prepare_for_load)
ig.Emit (OpCodes.Dup);
}
source.Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (!FieldInfo.IsStatic) {
temp = new LocalTemporary (ec, this.Type);
temp.Store (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);
if (temp != null)
temp.Emit (ec);
}
void EmitInstance (EmitContext ec)
{
if (instance_expr.Type.IsValueType) {
if (instance_expr is IMemoryLocation) {
((IMemoryLocation) instance_expr).AddressOf (ec, AddressOp.LoadStore);
} else {
LocalTemporary t = new LocalTemporary (ec, instance_expr.Type);
instance_expr.Emit (ec);
t.Store (ec);
t.AddressOf (ec, AddressOp.Store);
}
} else
instance_expr.Emit (ec);
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
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 {
EmitInstance (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;
Expression instance_expr;
LocalTemporary temp;
bool prepared;
internal static PtrHashtable AccessorTable = new PtrHashtable ();
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;
}
void FindAccessors (Type invocation_type)
{
BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic |
BindingFlags.Static | BindingFlags.Instance |
BindingFlags.DeclaredOnly;
Type current = PropertyInfo.DeclaringType;
for (; current != null; current = current.BaseType) {
MemberInfo[] group = TypeManager.MemberLookup (
invocation_type, invocation_type, current,
MemberTypes.Property, flags, PropertyInfo.Name, null);
if (group == null)
continue;
if (group.Length != 1)
// Oooops, can this ever happen ?
return;
PropertyInfo pi = (PropertyInfo) group [0];
if (getter == null)
getter = pi.GetGetMethod (true);
if (setter == null)
setter = pi.GetSetMethod (true);
MethodInfo accessor = getter != null ? getter : setter;
if (!accessor.IsVirtual)
return;
}
}
//
// We also perform the permission checking here, as the PropertyInfo does not
// hold the information for the accessibility of its setter/getter
//
void ResolveAccessors (EmitContext ec)
{
FindAccessors (ec.ContainerType);
if (getter != null) {
AccessorTable [getter] = PropertyInfo;
is_static = getter.IsStatic;
}
if (setter != null) {
AccessorTable [setter] = PropertyInfo;
is_static = setter.IsStatic;
}
}
bool InstanceResolve (EmitContext ec, bool must_do_cs1540_check)
{
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;
instance_expr.CheckMarshallByRefAccess (ec.ContainerType);
}
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){
if (TypeManager.GetArgumentTypes (getter).Length != 0){
Report.Error (
117, loc, "`{0}' does not contain a " +
"definition for `{1}'.", getter.DeclaringType,
Name);
return null;
}
}
if (getter == null){
//
// The following condition happens if the PropertyExpr was
// created, but is invalid (ie, the property is inaccessible),
// and we did not want to embed the knowledge about this in
// the caller routine. This only avoids double error reporting.
//
if (setter == null)
return null;
Report.Error (154, loc,
"The property `" + PropertyInfo.Name +
"' can not be used in " +
"this context because it lacks a get accessor");
return null;
}
bool must_do_cs1540_check;
if (!IsAccessorAccessible (ec.ContainerType, getter, out must_do_cs1540_check)) {
Report.Error (122, loc, "'{0}.get' is inaccessible due to its protection level", PropertyInfo.Name);
return null;
}
if (!InstanceResolve (ec, must_do_cs1540_check))
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;
}
if (PropertyInfo.PropertyType.IsPointer && !ec.InUnsafe){
UnsafeError (loc);
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;
// TODO: Print better property name
Report.Error (200, loc, "Property or indexer '{0}' cannot be assigned to -- it is read only",
PropertyInfo.Name);
return null;
}
if (TypeManager.GetArgumentTypes (setter).Length != 1){
Report.Error (
117, loc, "`{0}' does not contain a " +
"definition for `{1}'.", getter.DeclaringType,
Name);
return null;
}
bool must_do_cs1540_check;
if (!IsAccessorAccessible (ec.ContainerType, setter, out must_do_cs1540_check)) {
Report.Error (122, loc, "'{0}.set' is inaccessible due to its protection level", PropertyInfo.Name);
return null;
}
if (!InstanceResolve (ec, must_do_cs1540_check))
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;
}
//
// Check that we are not making changes to a temporary memory location
//
if (instance_expr != null && 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;
}
return this;
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
void EmitInstance (EmitContext ec)
{
if (is_static)
return;
if (instance_expr.Type.IsValueType) {
if (instance_expr is IMemoryLocation) {
((IMemoryLocation) instance_expr).AddressOf (ec, AddressOp.LoadStore);
} else {
LocalTemporary t = new LocalTemporary (ec, instance_expr.Type);
instance_expr.Emit (ec);
t.Store (ec);
t.AddressOf (ec, AddressOp.Store);
}
} else
instance_expr.Emit (ec);
if (prepared)
ec.ig.Emit (OpCodes.Dup);
}
public void Emit (EmitContext ec, bool leave_copy)
{
if (!prepared)
EmitInstance (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)) {
ec.ig.Emit (OpCodes.Ldlen);
ec.ig.Emit (OpCodes.Conv_I4);
return;
}
}
Invocation.EmitCall (ec, IsBase, IsStatic, new EmptyAddressOf (), getter, null, loc);
if (!leave_copy)
return;
ec.ig.Emit (OpCodes.Dup);
if (!is_static) {
temp = new LocalTemporary (ec, this.Type);
temp.Store (ec);
}
}
//
// Implements the IAssignMethod interface for assignments
//
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
{
prepared = prepare_for_load;
EmitInstance (ec);
source.Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (!is_static) {
temp = new LocalTemporary (ec, this.Type);
temp.Store (ec);
}
}
ArrayList args = new ArrayList (1);
args.Add (new Argument (new EmptyAddressOf (), Argument.AType.Expression));
Invocation.EmitCall (ec, IsBase, IsStatic, new EmptyAddressOf (), setter, args, loc);
if (temp != null)
temp.Emit (ec);
}
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;
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;
}
}
bool InstanceResolve (EmitContext ec, bool must_do_cs1540_check)
{
if ((instance_expr == null) && ec.IsStatic && !is_static) {
SimpleName.Error_ObjectRefRequired (ec, loc, EventInfo.Name);
return false;
}
if (instance_expr != null) {
instance_expr = instance_expr.DoResolve (ec);
if (instance_expr == null)
return false;
}
//
// This is using the same mechanism as the CS1540 check in PropertyExpr.
// However, in the Event case, we reported a CS0122 instead.
//
if (must_do_cs1540_check && (instance_expr != null)) {
if ((instance_expr.Type != ec.ContainerType) &&
ec.ContainerType.IsSubclassOf (instance_expr.Type)) {
Report.Error (122, loc, "'{0}' is inaccessible due to its protection level",
DeclaringType.Name + "." + EventInfo.Name);
return false;
}
}
return true;
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return DoResolve (ec);
}
public override Expression DoResolve (EmitContext ec)
{
if (instance_expr != null) {
instance_expr = instance_expr.DoResolve (ec);
if (instance_expr == null)
return null;
}
bool must_do_cs1540_check;
if (!(IsAccessorAccessible (ec.ContainerType, add_accessor, out must_do_cs1540_check)
&& IsAccessorAccessible (ec.ContainerType, remove_accessor, out must_do_cs1540_check))) {
Report.Error (122, loc, "'{0}' is inaccessible due to its protection level",
DeclaringType.Name + "." + EventInfo.Name);
return null;
}
if (!InstanceResolve (ec, must_do_cs1540_check))
return null;
return this;
}
public override void Emit (EmitContext ec)
{
if (instance_expr is This)
Report.Error (79, loc, "The event `{0}' can only appear on the left hand side of += or -=, try calling the actual delegate", Name);
else
Report.Error (70, loc, "The event `{0}' can only appear on the left hand side of += or -= "+
"(except on the defining type)", Name);
}
public 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);
}
}
}