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//
// field.cs: All field handlers
//
// Authors: Miguel de Icaza (miguel@gnu.org)
// Martin Baulig (martin@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// Dual licensed under the terms of the MIT X11 or GNU GPL
//
// Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
// Copyright 2004-2008 Novell, Inc
// Copyright 2011 Xamarin Inc
//
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
#if STATIC
using MetaType = IKVM.Reflection.Type;
using IKVM.Reflection;
using IKVM.Reflection.Emit;
#else
using MetaType = System.Type;
using System.Reflection;
using System.Reflection.Emit;
#endif
namespace Mono.CSharp
{
public class FieldDeclarator
{
public FieldDeclarator (SimpleMemberName name, Expression initializer)
{
this.Name = name;
this.Initializer = initializer;
}
#region Properties
public SimpleMemberName Name { get; private set; }
public Expression Initializer { get; private set; }
#endregion
}
//
// Abstract class for all fields
//
abstract public class FieldBase : MemberBase
{
protected FieldBuilder FieldBuilder;
protected FieldSpec spec;
public Status status;
protected Expression initializer;
protected List<FieldDeclarator> declarators;
[Flags]
public enum Status : byte {
HAS_OFFSET = 4 // Used by FieldMember.
}
static readonly string[] attribute_targets = new string [] { "field" };
protected FieldBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, MemberName name, Attributes attrs)
: base (parent, type, mod, allowed_mod | Modifiers.ABSTRACT, Modifiers.PRIVATE, name, attrs)
{
if ((mod & Modifiers.ABSTRACT) != 0)
Report.Error (681, Location, "The modifier 'abstract' is not valid on fields. Try using a property instead");
}
#region Properties
public override AttributeTargets AttributeTargets {
get {
return AttributeTargets.Field;
}
}
public List<FieldDeclarator> Declarators {
get {
return this.declarators;
}
}
public Expression Initializer {
get {
return initializer;
}
set {
this.initializer = value;
}
}
public string Name {
get {
return MemberName.Name;
}
}
public FieldSpec Spec {
get {
return spec;
}
}
public override string[] ValidAttributeTargets {
get {
return attribute_targets;
}
}
#endregion
public void AddDeclarator (FieldDeclarator declarator)
{
if (declarators == null)
declarators = new List<FieldDeclarator> (2);
declarators.Add (declarator);
Parent.AddNameToContainer (this, declarator.Name.Value);
}
public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
{
if (a.Type == pa.FieldOffset) {
status |= Status.HAS_OFFSET;
if (!Parent.PartialContainer.HasExplicitLayout) {
Report.Error (636, Location, "The FieldOffset attribute can only be placed on members of types marked with the StructLayout(LayoutKind.Explicit)");
return;
}
if ((ModFlags & Modifiers.STATIC) != 0 || this is Const) {
Report.Error (637, Location, "The FieldOffset attribute is not allowed on static or const fields");
return;
}
}
if (a.Type == pa.FixedBuffer) {
Report.Error (1716, Location, "Do not use 'System.Runtime.CompilerServices.FixedBuffer' attribute. Use the 'fixed' field modifier instead");
return;
}
#if false
if (a.Type == pa.MarshalAs) {
UnmanagedMarshal marshal = a.GetMarshal (this);
if (marshal != null) {
FieldBuilder.SetMarshal (marshal);
}
return;
}
#endif
if ((a.HasSecurityAttribute)) {
a.Error_InvalidSecurityParent ();
return;
}
if (a.Type == pa.Dynamic) {
a.Error_MisusedDynamicAttribute ();
return;
}
FieldBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
}
public void SetCustomAttribute (MethodSpec ctor, byte[] data)
{
FieldBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), data);
}
protected override bool CheckBase ()
{
if (!base.CheckBase ())
return false;
MemberSpec candidate;
bool overrides = false;
var conflict_symbol = MemberCache.FindBaseMember (this, out candidate, ref overrides);
if (conflict_symbol == null)
conflict_symbol = candidate;
if (conflict_symbol == null) {
if ((ModFlags & Modifiers.NEW) != 0) {
Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
GetSignatureForError ());
}
} else {
if ((ModFlags & (Modifiers.NEW | Modifiers.OVERRIDE | Modifiers.BACKING_FIELD)) == 0) {
Report.SymbolRelatedToPreviousError (conflict_symbol);
Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
GetSignatureForError (), conflict_symbol.GetSignatureForError ());
}
if (conflict_symbol.IsAbstract) {
Report.SymbolRelatedToPreviousError (conflict_symbol);
Report.Error (533, Location, "`{0}' hides inherited abstract member `{1}'",
GetSignatureForError (), conflict_symbol.GetSignatureForError ());
}
}
return true;
}
public virtual Constant ConvertInitializer (ResolveContext rc, Constant expr)
{
return expr.ConvertImplicitly (MemberType);
}
protected override void DoMemberTypeDependentChecks ()
{
base.DoMemberTypeDependentChecks ();
if (MemberType.IsGenericParameter)
return;
if (MemberType.IsStatic)
Error_VariableOfStaticClass (Location, GetSignatureForError (), MemberType, Report);
CheckBase ();
IsTypePermitted ();
}
//
// Represents header string for documentation comment.
//
public override string DocCommentHeader {
get { return "F:"; }
}
public override void Emit ()
{
if (member_type.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
Module.PredefinedAttributes.Dynamic.EmitAttribute (FieldBuilder);
} else if (!Parent.IsCompilerGenerated && member_type.HasDynamicElement) {
Module.PredefinedAttributes.Dynamic.EmitAttribute (FieldBuilder, member_type, Location);
}
if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
Module.PredefinedAttributes.CompilerGenerated.EmitAttribute (FieldBuilder);
if ((ModFlags & Modifiers.DEBUGGER_HIDDEN) != 0)
Module.PredefinedAttributes.DebuggerBrowsable.EmitAttribute (FieldBuilder, System.Diagnostics.DebuggerBrowsableState.Never);
if (OptAttributes != null) {
OptAttributes.Emit ();
}
if (((status & Status.HAS_OFFSET) == 0) && (ModFlags & (Modifiers.STATIC | Modifiers.BACKING_FIELD)) == 0 && Parent.PartialContainer.HasExplicitLayout) {
Report.Error (625, Location, "`{0}': Instance field types marked with StructLayout(LayoutKind.Explicit) must have a FieldOffset attribute", GetSignatureForError ());
}
ConstraintChecker.Check (this, member_type, type_expr.Location);
base.Emit ();
}
public static void Error_VariableOfStaticClass (Location loc, string variable_name, TypeSpec static_class, Report Report)
{
Report.SymbolRelatedToPreviousError (static_class);
Report.Error (723, loc, "`{0}': cannot declare variables of static types",
variable_name);
}
protected override bool VerifyClsCompliance ()
{
if (!base.VerifyClsCompliance ())
return false;
if (!MemberType.IsCLSCompliant () || this is FixedField) {
Report.Warning (3003, 1, Location, "Type of `{0}' is not CLS-compliant",
GetSignatureForError ());
}
return true;
}
}
//
// Field specification
//
public class FieldSpec : MemberSpec, IInterfaceMemberSpec
{
FieldInfo metaInfo;
TypeSpec memberType;
public FieldSpec (TypeSpec declaringType, IMemberDefinition definition, TypeSpec memberType, FieldInfo info, Modifiers modifiers)
: base (MemberKind.Field, declaringType, definition, modifiers)
{
this.metaInfo = info;
this.memberType = memberType;
}
#region Properties
public bool IsReadOnly {
get {
return (Modifiers & Modifiers.READONLY) != 0;
}
}
public TypeSpec MemberType {
get {
return memberType;
}
}
#endregion
public FieldInfo GetMetaInfo ()
{
if ((state & StateFlags.PendingMetaInflate) != 0) {
var decl_meta = DeclaringType.GetMetaInfo ();
if (DeclaringType.IsTypeBuilder) {
metaInfo = TypeBuilder.GetField (decl_meta, metaInfo);
} else {
var orig_token = metaInfo.MetadataToken;
metaInfo = decl_meta.GetField (Name, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
if (metaInfo.MetadataToken != orig_token)
throw new NotImplementedException ("Resolved to wrong meta token");
// What a stupid API, does not work because field handle is imported
// metaInfo = FieldInfo.GetFieldFromHandle (metaInfo.FieldHandle, DeclaringType.MetaInfo.TypeHandle);
}
state &= ~StateFlags.PendingMetaInflate;
}
return metaInfo;
}
public override MemberSpec InflateMember (TypeParameterInflator inflator)
{
var fs = (FieldSpec) base.InflateMember (inflator);
fs.memberType = inflator.Inflate (memberType);
return fs;
}
public FieldSpec Mutate (TypeParameterMutator mutator)
{
var decl = DeclaringType;
if (DeclaringType.IsGenericOrParentIsGeneric)
decl = mutator.Mutate (decl);
if (decl == DeclaringType)
return this;
var fs = (FieldSpec) MemberwiseClone ();
fs.declaringType = decl;
fs.state |= StateFlags.PendingMetaInflate;
// Gets back FieldInfo in case of metaInfo was inflated
fs.metaInfo = MemberCache.GetMember (TypeParameterMutator.GetMemberDeclaringType (DeclaringType), this).metaInfo;
return fs;
}
public override List<TypeSpec> ResolveMissingDependencies ()
{
return memberType.ResolveMissingDependencies ();
}
}
/// <summary>
/// Fixed buffer implementation
/// </summary>
public class FixedField : FieldBase
{
public const string FixedElementName = "FixedElementField";
static int GlobalCounter = 0;
TypeBuilder fixed_buffer_type;
const Modifiers AllowedModifiers =
Modifiers.NEW |
Modifiers.PUBLIC |
Modifiers.PROTECTED |
Modifiers.INTERNAL |
Modifiers.PRIVATE |
Modifiers.UNSAFE;
public FixedField (TypeDefinition parent, FullNamedExpression type, Modifiers mod, MemberName name, Attributes attrs)
: base (parent, type, mod, AllowedModifiers, name, attrs)
{
}
#region Properties
//
// Explicit struct layout set by parent
//
public CharSet? CharSet {
get; set;
}
#endregion
public override Constant ConvertInitializer (ResolveContext rc, Constant expr)
{
return expr.ImplicitConversionRequired (rc, rc.BuiltinTypes.Int, Location);
}
public override bool Define ()
{
if (!base.Define ())
return false;
if (!BuiltinTypeSpec.IsPrimitiveType (MemberType)) {
Report.Error (1663, Location,
"`{0}': Fixed size buffers type must be one of the following: bool, byte, short, int, long, char, sbyte, ushort, uint, ulong, float or double",
GetSignatureForError ());
} else if (declarators != null) {
var t = new TypeExpression (MemberType, TypeExpression.Location);
foreach (var d in declarators) {
var f = new FixedField (Parent, t, ModFlags, new MemberName (d.Name.Value, d.Name.Location), OptAttributes);
f.initializer = d.Initializer;
((ConstInitializer) f.initializer).Name = d.Name.Value;
f.Define ();
Parent.PartialContainer.Members.Add (f);
}
}
// Create nested fixed buffer container
string name = String.Format ("<{0}>__FixedBuffer{1}", Name, GlobalCounter++);
fixed_buffer_type = Parent.TypeBuilder.DefineNestedType (name,
TypeAttributes.NestedPublic | TypeAttributes.Sealed | TypeAttributes.BeforeFieldInit,
Compiler.BuiltinTypes.ValueType.GetMetaInfo ());
var ffield = fixed_buffer_type.DefineField (FixedElementName, MemberType.GetMetaInfo (), FieldAttributes.Public);
FieldBuilder = Parent.TypeBuilder.DefineField (Name, fixed_buffer_type, ModifiersExtensions.FieldAttr (ModFlags));
var element_spec = new FieldSpec (null, this, MemberType, ffield, ModFlags);
spec = new FixedFieldSpec (Parent.Definition, this, FieldBuilder, element_spec, ModFlags);
Parent.MemberCache.AddMember (spec);
return true;
}
protected override void DoMemberTypeIndependentChecks ()
{
base.DoMemberTypeIndependentChecks ();
if (!IsUnsafe)
Expression.UnsafeError (Report, Location);
if (Parent.PartialContainer.Kind != MemberKind.Struct) {
Report.Error (1642, Location, "`{0}': Fixed size buffer fields may only be members of structs",
GetSignatureForError ());
}
}
public override void Emit()
{
ResolveContext rc = new ResolveContext (this);
IntConstant buffer_size_const = initializer.Resolve (rc) as IntConstant;
if (buffer_size_const == null)
return;
int buffer_size = buffer_size_const.Value;
if (buffer_size <= 0) {
Report.Error (1665, Location, "`{0}': Fixed size buffers must have a length greater than zero", GetSignatureForError ());
return;
}
EmitFieldSize (buffer_size);
#if STATIC
if (Module.HasDefaultCharSet)
fixed_buffer_type.__SetAttributes (fixed_buffer_type.Attributes | Module.DefaultCharSetType);
#endif
Module.PredefinedAttributes.UnsafeValueType.EmitAttribute (fixed_buffer_type);
Module.PredefinedAttributes.CompilerGenerated.EmitAttribute (fixed_buffer_type);
fixed_buffer_type.CreateType ();
base.Emit ();
}
void EmitFieldSize (int buffer_size)
{
int type_size = BuiltinTypeSpec.GetSize (MemberType);
if (buffer_size > int.MaxValue / type_size) {
Report.Error (1664, Location, "Fixed size buffer `{0}' of length `{1}' and type `{2}' exceeded 2^31 limit",
GetSignatureForError (), buffer_size.ToString (), TypeManager.CSharpName (MemberType));
return;
}
AttributeEncoder encoder;
var ctor = Module.PredefinedMembers.StructLayoutAttributeCtor.Resolve (Location);
if (ctor == null)
return;
var field_size = Module.PredefinedMembers.StructLayoutSize.Resolve (Location);
var field_charset = Module.PredefinedMembers.StructLayoutCharSet.Resolve (Location);
if (field_size == null || field_charset == null)
return;
var char_set = CharSet ?? Module.DefaultCharSet ?? 0;
encoder = new AttributeEncoder ();
encoder.Encode ((short)LayoutKind.Sequential);
encoder.EncodeNamedArguments (
new [] { field_size, field_charset },
new Constant [] {
new IntConstant (Compiler.BuiltinTypes, buffer_size * type_size, Location),
new IntConstant (Compiler.BuiltinTypes, (int) char_set, Location)
}
);
fixed_buffer_type.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), encoder.ToArray ());
//
// Don't emit FixedBufferAttribute attribute for private types
//
if ((ModFlags & Modifiers.PRIVATE) != 0)
return;
ctor = Module.PredefinedMembers.FixedBufferAttributeCtor.Resolve (Location);
if (ctor == null)
return;
encoder = new AttributeEncoder ();
encoder.EncodeTypeName (MemberType);
encoder.Encode (buffer_size);
encoder.EncodeEmptyNamedArguments ();
FieldBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), encoder.ToArray ());
}
}
class FixedFieldSpec : FieldSpec
{
readonly FieldSpec element;
public FixedFieldSpec (TypeSpec declaringType, IMemberDefinition definition, FieldInfo info, FieldSpec element, Modifiers modifiers)
: base (declaringType, definition, element.MemberType, info, modifiers)
{
this.element = element;
// It's never CLS-Compliant
state &= ~StateFlags.CLSCompliant_Undetected;
}
public FieldSpec Element {
get {
return element;
}
}
public TypeSpec ElementType {
get {
return MemberType;
}
}
}
//
// The Field class is used to represents class/struct fields during parsing.
//
public class Field : FieldBase {
// <summary>
// Modifiers allowed in a class declaration
// </summary>
const Modifiers AllowedModifiers =
Modifiers.NEW |
Modifiers.PUBLIC |
Modifiers.PROTECTED |
Modifiers.INTERNAL |
Modifiers.PRIVATE |
Modifiers.STATIC |
Modifiers.VOLATILE |
Modifiers.UNSAFE |
Modifiers.READONLY;
public Field (TypeDefinition parent, FullNamedExpression type, Modifiers mod, MemberName name, Attributes attrs)
: base (parent, type, mod, AllowedModifiers, name, attrs)
{
}
bool CanBeVolatile ()
{
switch (MemberType.BuiltinType) {
case BuiltinTypeSpec.Type.Bool:
case BuiltinTypeSpec.Type.Char:
case BuiltinTypeSpec.Type.SByte:
case BuiltinTypeSpec.Type.Byte:
case BuiltinTypeSpec.Type.Short:
case BuiltinTypeSpec.Type.UShort:
case BuiltinTypeSpec.Type.Int:
case BuiltinTypeSpec.Type.UInt:
case BuiltinTypeSpec.Type.Float:
case BuiltinTypeSpec.Type.UIntPtr:
case BuiltinTypeSpec.Type.IntPtr:
return true;
}
if (TypeSpec.IsReferenceType (MemberType))
return true;
if (MemberType.IsEnum)
return true;
return false;
}
public override void Accept (StructuralVisitor visitor)
{
visitor.Visit (this);
}
public override bool Define ()
{
if (!base.Define ())
return false;
MetaType[] required_modifier = null;
if ((ModFlags & Modifiers.VOLATILE) != 0) {
var mod = Module.PredefinedTypes.IsVolatile.Resolve ();
if (mod != null)
required_modifier = new MetaType[] { mod.GetMetaInfo () };
}
FieldBuilder = Parent.TypeBuilder.DefineField (
Name, member_type.GetMetaInfo (), required_modifier, null, ModifiersExtensions.FieldAttr (ModFlags));
spec = new FieldSpec (Parent.Definition, this, MemberType, FieldBuilder, ModFlags);
//
// Don't cache inaccessible fields except for struct where we
// need them for definitive assignment checks
//
if ((ModFlags & Modifiers.BACKING_FIELD) == 0 || Parent.Kind == MemberKind.Struct) {
Parent.MemberCache.AddMember (spec);
}
if (initializer != null) {
Parent.RegisterFieldForInitialization (this, new FieldInitializer (this, initializer, TypeExpression.Location));
}
if (declarators != null) {
foreach (var d in declarators) {
var t = new TypeExpression (MemberType, d.Name.Location);
var f = new Field (Parent, t, ModFlags, new MemberName (d.Name.Value, d.Name.Location), OptAttributes);
if (d.Initializer != null)
f.initializer = d.Initializer;
f.Define ();
Parent.PartialContainer.Members.Add (f);
}
}
return true;
}
protected override void DoMemberTypeDependentChecks ()
{
if ((ModFlags & Modifiers.BACKING_FIELD) != 0)
return;
base.DoMemberTypeDependentChecks ();
if ((ModFlags & Modifiers.VOLATILE) != 0) {
if (!CanBeVolatile ()) {
Report.Error (677, Location, "`{0}': A volatile field cannot be of the type `{1}'",
GetSignatureForError (), TypeManager.CSharpName (MemberType));
}
if ((ModFlags & Modifiers.READONLY) != 0) {
Report.Error (678, Location, "`{0}': A field cannot be both volatile and readonly",
GetSignatureForError ());
}
}
}
protected override bool VerifyClsCompliance ()
{
if (!base.VerifyClsCompliance ())
return false;
if ((ModFlags & Modifiers.VOLATILE) != 0) {
Report.Warning (3026, 1, Location, "CLS-compliant field `{0}' cannot be volatile", GetSignatureForError ());
}
return true;
}
}
}
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