//
// rootcontext.cs: keeps track of our tree representation, and assemblies loaded.
//
// Author: Miguel de Icaza (miguel@ximian.com)
// Ravi Pratap (ravi@ximian.com)
//
// Licensed under the terms of the GNU GPL
//
// (C) 2001 Ximian, Inc (http://www.ximian.com)
using System;
using System.Collections;
using System.Reflection;
using System.Reflection.Emit;
using System.Diagnostics;
namespace Mono.CSharp {
public class RootContext {
//
// Contains the parsed tree
//
static Tree tree;
//
// This hashtable contains all of the #definitions across the source code
// it is used by the ConditionalAttribute handler.
//
public static Hashtable AllDefines = new Hashtable ();
//
// The list of global attributes (those that target the assembly)
//
static Hashtable global_attributes = new Hashtable ();
//
// Whether we are being linked against the standard libraries.
// This is only used to tell whether `System.Object' should
// have a parent or not.
//
public static bool StdLib = true;
//
// This keeps track of the order in which classes were defined
// so that we can poulate them in that order.
//
// Order is important, because we need to be able to tell by
// examining the parent's list of methods which ones are virtual
// or abstract as well as the parent names (to implement new,
// override).
//
static ArrayList type_container_resolve_order;
static ArrayList interface_resolve_order;
static ArrayList attribute_types;
//
// Holds a reference to the Private Implementation Details
// class.
//
static TypeBuilder impl_details_class;
public static int WarningLevel = 2;
//
// Constructor
//
static RootContext ()
{
tree = new Tree ();
interface_resolve_order = new ArrayList ();
type_container_resolve_order = new ArrayList ();
}
static public Tree Tree {
get {
return tree;
}
}
static public string MainClass;
public static void RegisterOrder (Interface iface)
{
interface_resolve_order.Add (iface);
}
public static void RegisterOrder (TypeContainer tc)
{
type_container_resolve_order.Add (tc);
}
public static void RegisterAttribute (TypeContainer tc)
{
if (attribute_types == null)
attribute_types = new ArrayList ();
attribute_types.Add (tc);
}
//
// The default compiler checked state
//
static public bool Checked = false;
//
// Whether to allow Unsafe code
//
static public bool Unsafe = false;
static string MakeFQN (string nsn, string name)
{
string prefix = (nsn == "" ? "" : nsn + ".");
return prefix + name;
}
//
// This function is used to resolve the hierarchy tree.
// It processes interfaces, structs and classes in that order.
//
// It creates the TypeBuilder's as it processes the user defined
// types.
//
static public void ResolveTree ()
{
//
// Process the attribute types separately and before anything else
//
if (attribute_types != null)
foreach (TypeContainer tc in attribute_types)
tc.DefineType ();
//
// Interfaces are processed next, as classes and
// structs might inherit from an object or implement
// a set of interfaces, we need to be able to tell
// them appart by just using the TypeManager.
//
TypeContainer root = Tree.Types;
ArrayList ifaces = root.Interfaces;
if (ifaces != null){
foreach (Interface i in ifaces)
i.DefineType ();
}
foreach (TypeContainer tc in root.Types)
tc.DefineType ();
if (root.Delegates != null)
foreach (Delegate d in root.Delegates)
d.DefineType ();
if (root.Enums != null)
foreach (Enum e in root.Enums)
e.DefineType ();
}
static void Error_TypeConflict (string name, Location loc)
{
Report.Error (
520, loc, "`" + name + "' conflicts with a predefined type");
}
static void Error_TypeConflict (string name)
{
Report.Error (
520, "`" + name + "' conflicts with a predefined type");
}
//
// Resolves a single class during the corlib bootstrap process
//
static TypeBuilder BootstrapCorlib_ResolveClass (TypeContainer root, string name)
{
object o = root.GetDefinition (name);
if (o == null){
Report.Error (518, "The predefined type `" + name + "' is not defined");
return null;
}
if (!(o is Class)){
if (o is DeclSpace){
DeclSpace d = (DeclSpace) o;
Error_TypeConflict (name, d.Location);
} else
Error_TypeConflict (name);
return null;
}
return ((DeclSpace) o).DefineType ();
}
//
// Resolves a struct during the corlib bootstrap process
//
static void BootstrapCorlib_ResolveStruct (TypeContainer root, string name)
{
object o = root.GetDefinition (name);
if (o == null){
Report.Error (518, "The predefined type `" + name + "' is not defined");
return;
}
if (!(o is Struct)){
if (o is DeclSpace){
DeclSpace d = (DeclSpace) o;
Error_TypeConflict (name, d.Location);
} else
Error_TypeConflict (name);
return;
}
((DeclSpace) o).DefineType ();
}
//
// Resolves a struct during the corlib bootstrap process
//
static void BootstrapCorlib_ResolveInterface (TypeContainer root, string name)
{
object o = root.GetDefinition (name);
if (o == null){
Report.Error (518, "The predefined type `" + name + "' is not defined");
return;
}
if (!(o is Interface)){
if (o is DeclSpace){
DeclSpace d = (DeclSpace) o;
Error_TypeConflict (name, d.Location);
} else
Error_TypeConflict (name);
return;
}
((DeclSpace) o).DefineType ();
}
//
// Resolves a delegate during the corlib bootstrap process
//
static void BootstrapCorlib_ResolveDelegate (TypeContainer root, string name)
{
object o = root.GetDefinition (name);
if (o == null){
Report.Error (518, "The predefined type `" + name + "' is not defined");
Environment.Exit (0);
}
if (!(o is Delegate)){
Error_TypeConflict (name);
return;
}
((DeclSpace) o).DefineType ();
}
///
/// Resolves the core types in the compiler when compiling with --nostdlib
///
static public void ResolveCore ()
{
TypeContainer root = Tree.Types;
TypeManager.object_type = BootstrapCorlib_ResolveClass (root, "System.Object");
TypeManager.value_type = BootstrapCorlib_ResolveClass (root, "System.ValueType");
TypeManager.attribute_type = BootstrapCorlib_ResolveClass (root, "System.Attribute");
string [] interfaces_first_stage = {
"System.IComparable", "System.ICloneable",
"System.IConvertible",
"System.Collections.IEnumerable",
"System.Collections.ICollection",
"System.Collections.IEnumerator",
"System.Collections.IList",
"System.IAsyncResult",
"System.IDisposable",
"System.Runtime.Serialization.ISerializable",
"System.Reflection.IReflect",
"System.Reflection.ICustomAttributeProvider"
};
foreach (string iname in interfaces_first_stage)
BootstrapCorlib_ResolveInterface (root, iname);
//
// These are the base value types
//
string [] structs_first_stage = {
"System.Byte", "System.SByte",
"System.Int16", "System.UInt16",
"System.Int32", "System.UInt32",
"System.Int64", "System.UInt64",
};
foreach (string cname in structs_first_stage)
BootstrapCorlib_ResolveStruct (root, cname);
//
// Now, we can load the enumerations, after this point,
// we can use enums.
//
TypeManager.InitEnumUnderlyingTypes ();
string [] structs_second_stage = {
"System.Single", "System.Double",
"System.Char", "System.Boolean",
"System.Decimal", "System.Void",
"System.RuntimeFieldHandle",
"System.RuntimeTypeHandle",
"System.IntPtr"
};
foreach (string cname in structs_second_stage)
BootstrapCorlib_ResolveStruct (root, cname);
//
// These are classes that depends on the core interfaces
//
string [] classes_second_stage = {
"System.String", "System.Enum",
"System.Array", "System.MulticastDelegate",
"System.Delegate",
"System.Reflection.MemberInfo",
"System.Type",
//
// These are not really important in the order, but they
// are used by the compiler later on (typemanager/CoreLookupType-d)
//
"System.Runtime.CompilerServices.RuntimeHelpers",
"System.Reflection.DefaultMemberAttribute",
"System.Threading.Monitor",
"System.AttributeUsageAttribute",
"System.Runtime.InteropServices.DllImportAttribute",
"System.Runtime.CompilerServices.MethodImplAttribute",
"System.Runtime.InteropServices.MarshalAsAttribute",
"System.Diagnostics.ConditionalAttribute",
"System.ObsoleteAttribute",
"System.ParamArrayAttribute",
"System.Security.UnverifiableCodeAttribute",
"System.Runtime.CompilerServices.IndexerNameAttribute",
};
foreach (string cname in classes_second_stage)
BootstrapCorlib_ResolveClass (root, cname);
BootstrapCorlib_ResolveDelegate (root, "System.AsyncCallback");
}
//
// Closes all open types
//
//
//
// We usually use TypeBuilder types. When we are done
// creating the type (which will happen after we have added
// methods, fields, etc) we need to "Define" them before we
// can save the Assembly
//
static public void CloseTypes ()
{
TypeContainer root = Tree.Types;
ArrayList ifaces = root.Interfaces;
if (root.Enums != null)
foreach (Enum en in root.Enums)
en.CloseType ();
if (attribute_types != null)
foreach (TypeContainer tc in attribute_types)
tc.CloseType ();
foreach (Interface iface in interface_resolve_order)
iface.CloseType ();
//
// We do this in two passes, first we close the structs,
// then the classes, because it seems the code needs it this
// way. If this is really what is going on, we should probably
// make sure that we define the structs in order as well.
//
foreach (TypeContainer tc in type_container_resolve_order){
if (tc is Struct && tc.Parent == tree.Types){
tc.CloseType ();
}
}
foreach (TypeContainer tc in type_container_resolve_order){
if (!(tc is Struct && tc.Parent == tree.Types))
tc.CloseType ();
}
if (root.Delegates != null)
foreach (Delegate d in root.Delegates)
d.CloseDelegate ();
//
// If we have a class, close it
//
if (impl_details_class != null){
impl_details_class.CreateType ();
}
}
//
// This idea is from Felix Arrese-Igor
//
// Returns : the implicit parent of a composite namespace string
// eg. Implicit parent of A.B is A
//
static public string ImplicitParent (string ns)
{
int i = ns.LastIndexOf (".");
if (i < 0)
return null;
return ns.Substring (0, i);
}
static Type NamespaceLookup (Namespace curr_ns, string name)
{
Type t;
//
// Try in the current namespace and all its implicit parents
//
for (string ns = curr_ns.Name; ns != null; ns = ImplicitParent (ns)) {
t = TypeManager.LookupType (MakeFQN (ns, name));
if (t != null)
return t;
}
//
// It's possible that name already is fully qualified. So we do
// a simple direct lookup without adding any namespace names
//
t = TypeManager.LookupType (name);
if (t != null)
return t;
//
// Try the aliases in the current namespace
//
string alias = curr_ns.LookupAlias (name);
if (alias != null) {
t = TypeManager.LookupType (alias);
if (t != null)
return t;
t = TypeManager.LookupType (MakeFQN (alias, name));
if (t != null)
return t;
}
for (Namespace ns = curr_ns; ns != null; ns = ns.Parent) {
//
// Look in the namespace ns
//
t = TypeManager.LookupType (MakeFQN (ns.Name, name));
if (t != null)
return t;
//
// Then try with the using clauses
//
ArrayList using_list = ns.UsingTable;
if (using_list == null)
continue;
foreach (string n in using_list) {
t = TypeManager.LookupType (MakeFQN (n, name));
if (t != null)
return t;
}
//
// Try with aliases
//
string a = ns.LookupAlias (name);
if (a != null) {
t = TypeManager.LookupType (a);
if (t != null)
return t;
t = TypeManager.LookupType (MakeFQN (a, name));
if (t != null)
return t;
}
}
return null;
}
//
// Public function used to locate types, this can only
// be used after the ResolveTree function has been invoked.
//
// Returns: Type or null if they type can not be found.
//
// Come to think of it, this should be a DeclSpace
//
static public Type LookupType (DeclSpace ds, string name, bool silent, Location loc)
{
Type t;
if (ds.Cache.Contains (name)){
t = (Type) ds.Cache [name];
if (t != null)
return t;
} else {
//
// For the case the type we are looking for is nested within this one
// or is in any base class
//
DeclSpace containing_ds = ds;
while (containing_ds != null){
Type current_type = containing_ds.TypeBuilder;
while (current_type != null) {
//
// nested class
//
t = TypeManager.LookupType (current_type.FullName + "+" + name);
if (t != null){
ds.Cache [name] = t;
return t;
}
current_type = current_type.BaseType;
}
containing_ds = containing_ds.Parent;
}
t = NamespaceLookup (ds.Namespace, name);
if (t != null){
ds.Cache [name] = t;
return t;
}
}
if (!silent)
Report.Error (246, loc, "Cannot find type `"+name+"'");
return null;
}
//
// This is the silent version of LookupType, you can use this
// to `probe' for a type
//
static public Type LookupType (TypeContainer tc, string name, Location loc)
{
return LookupType (tc, name, true, loc);
}
static public bool IsNamespace (string name)
{
Namespace ns;
if (tree.Namespaces != null){
ns = (Namespace) tree.Namespaces [name];
if (ns != null)
return true;
}
return false;
}
static void Report1530 (Location loc)
{
Report.Error (1530, loc, "Keyword new not allowed for namespace elements");
}
static public void PopulateCoreType (TypeContainer root, string name)
{
DeclSpace ds = (DeclSpace) root.GetDefinition (name);
ds.Define (root);
}
static public void BootCorlib_PopulateCoreTypes ()
{
TypeContainer root = tree.Types;
PopulateCoreType (root, "System.Object");
PopulateCoreType (root, "System.ValueType");
PopulateCoreType (root, "System.Attribute");
}
//
// Populates the structs and classes with fields and methods
//
//
// This is invoked after all interfaces, structs and classes
// have been defined through `ResolveTree'
static public void PopulateTypes ()
{
TypeContainer root = Tree.Types;
if (attribute_types != null)
foreach (TypeContainer tc in attribute_types)
tc.Define (root);
if (interface_resolve_order != null){
foreach (Interface iface in interface_resolve_order)
if ((iface.ModFlags & Modifiers.NEW) == 0)
iface.Define (root);
else
Report1530 (iface.Location);
}
if (type_container_resolve_order != null){
foreach (TypeContainer tc in type_container_resolve_order)
if ((tc.ModFlags & Modifiers.NEW) == 0)
tc.Define (root);
else
Report1530 (tc.Location);
}
ArrayList delegates = root.Delegates;
if (delegates != null){
foreach (Delegate d in delegates)
if ((d.ModFlags & Modifiers.NEW) == 0)
d.Define (root);
else
Report1530 (d.Location);
}
ArrayList enums = root.Enums;
if (enums != null){
foreach (Enum en in enums)
if ((en.ModFlags & Modifiers.NEW) == 0)
en.Define (root);
else
Report1530 (en.Location);
}
}
static public void EmitCode ()
{
//
// Because of the strange way in which we do things, global
// attributes must be processed first.
//
if (global_attributes.Count > 0){
AssemblyBuilder ab = CodeGen.AssemblyBuilder;
TypeContainer dummy = new TypeContainer (null, "", new Location (-1));
EmitContext temp_ec = new EmitContext (
dummy, Mono.CSharp.Location.Null, null, null, 0, false);
foreach (DictionaryEntry de in global_attributes){
Namespace ns = (Namespace) de.Key;
Attributes attrs = (Attributes) de.Value;
dummy.Namespace = ns;
Attribute.ApplyAttributes (temp_ec, ab, ab, attrs, attrs.Location);
}
}
if (attribute_types != null)
foreach (TypeContainer tc in attribute_types)
tc.Emit ();
if (type_container_resolve_order != null) {
foreach (TypeContainer tc in type_container_resolve_order)
tc.EmitConstants ();
foreach (TypeContainer tc in type_container_resolve_order)
tc.Emit ();
}
if (Unsafe) {
ConstructorInfo ci = TypeManager.unverifiable_code_type.GetConstructor (new Type [0]);
if (ci == null) {
Console.WriteLine ("Internal error !");
return;
}
CustomAttributeBuilder cb = new CustomAttributeBuilder (ci, new object [0]);
CodeGen.ModuleBuilder.SetCustomAttribute (cb);
}
}
//
// Public Field, used to track which method is the public entry
// point.
//
static public MethodInfo EntryPoint;
//
// Track the location of the entry point.
//
static public Location EntryPointLocation;
//
// These are used to generate unique names on the structs and fields.
//
static int field_count;
//
// Makes an initialized struct, returns the field builder that
// references the data. Thanks go to Sergey Chaban for researching
// how to do this. And coming up with a shorter mechanism than I
// was able to figure out.
//
// This works but makes an implicit public struct $ArrayType$SIZE and
// makes the fields point to it. We could get more control if we did
// use instead:
//
// 1. DefineNestedType on the impl_details_class with our struct.
//
// 2. Define the field on the impl_details_class
//
static public FieldBuilder MakeStaticData (byte [] data)
{
FieldBuilder fb;
int size = data.Length;
if (impl_details_class == null)
impl_details_class = CodeGen.ModuleBuilder.DefineType (
"", TypeAttributes.NotPublic);
fb = impl_details_class.DefineInitializedData (
"$$field-" + (field_count++), data,
FieldAttributes.Static | FieldAttributes.Assembly);
return fb;
}
//
// Adds a global attribute that was declared in `container',
// the attribute is in `attr', and it was defined at `loc'
//
static public void AddGlobalAttribute (TypeContainer container,
AttributeSection attr, Location loc)
{
Namespace ns = container.Namespace;
Attributes a = (Attributes) global_attributes [ns];
if (a == null)
global_attributes [ns] = new Attributes (attr, loc);
else
a.AddAttribute (attr);
}
}
}