//
// rootcontext.cs: keeps track of our tree representation, and assemblies loaded.
//
// Author: Miguel de Icaza (miguel@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 CIR {
public class RootContext {
//
// Contains the parsed tree
//
Tree tree;
//
// Contains loaded assemblies and our generated code as we go.
//
public TypeManager TypeManager;
//
// The System.Reflection.Emit CodeGenerator
//
CodeGen cg;
//
// The module builder pointer
//
ModuleBuilder mb;
//
// Whether we are being linked against the standard libraries.
// This is only used to tell whether `System.Object' should
// have a parent or not.
//
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).
//
ArrayList type_container_resolve_order;
ArrayList interface_resolve_order;
//
// Holds a reference to the Private Implementation Details
// class.
//
TypeBuilder impl_details_class;
//
// Constructor
//
public RootContext ()
{
tree = new Tree (this);
TypeManager = new TypeManager ();
}
public Tree Tree {
get {
return tree;
}
}
public CodeGen CodeGen {
get {
return cg;
}
set {
//
// Temporary hack, we should probably
// intialize `cg' rather than depending on
// external initialization of it.
//
cg = value;
mb = cg.ModuleBuilder;
}
}
//
// The default compiler checked state
//
public bool Checked = false;
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.
//
public void ResolveTree ()
{
//
// Interfaces are processed first, 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){
interface_resolve_order = new ArrayList ();
foreach (Interface i in ifaces) {
Type t = i.DefineInterface (mb);
if (t != null)
interface_resolve_order.Add (i);
}
}
type_container_resolve_order = new ArrayList ();
foreach (TypeContainer tc in root.Types) {
Type t = tc.DefineType (mb);
if (t != null)
type_container_resolve_order.Add (tc);
}
if (root.Delegates != null)
foreach (Delegate d in root.Delegates)
d.DefineDelegate (mb);
if (root.Enums != null)
foreach (Enum e in root.Enums)
e.DefineEnum (mb);
}
//
// 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
//
public void CloseTypes ()
{
TypeContainer root = Tree.Types;
ArrayList ifaces = root.Interfaces;
if (ifaces != null)
foreach (Interface i in ifaces)
i.CloseType ();
foreach (TypeContainer tc in root.Types)
tc.CloseType ();
if (root.Delegates != null)
foreach (Delegate d in root.Delegates)
d.CloseDelegate ();
if (root.Enums != null)
foreach (Enum en in root.Enums)
en.CloseEnum ();
//
// If we have a class, close it
//
if (impl_details_class != null){
impl_details_class.CreateType ();
}
}
//
// 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.
//
public Type LookupType (TypeContainer tc, string name, bool silent)
{
Type t;
t = TypeManager.LookupType (MakeFQN (tc.Namespace.Name, 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;
for (Namespace ns = tc.Namespace; ns != null; ns = ns.Parent){
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;
}
}
// For the case the type we are looking for is nested within this one.
t = TypeManager.LookupType (tc.Name + "." + name);
if (t != null)
return t;
if (!silent)
Report.Error (246, "Cannot find type `"+name+"'");
return null;
}
//
// This is the silent version of LookupType, you can use this
// to `probe' for a type
//
public Type LookupType (TypeContainer tc, string name)
{
return LookupType (tc, name, true);
}
public bool IsNamespace (string name)
{
Namespace ns;
if (tree.Namespaces != null){
ns = (Namespace) tree.Namespaces [name];
if (ns != null)
return true;
}
return false;
}
//
// Populates the structs and classes with fields and methods
//
//
// This is invoked after all interfaces, structs and classes
// have been defined through `ResolveTree'
public void PopulateTypes ()
{
if (interface_resolve_order != null)
foreach (Interface iface in interface_resolve_order)
iface.Populate ();
if (type_container_resolve_order != null)
foreach (TypeContainer tc in type_container_resolve_order)
tc.Populate ();
TypeContainer root = Tree.Types;
ArrayList delegates = root.Delegates;
if (delegates != null)
foreach (Delegate d in delegates)
d.Populate (root);
ArrayList enums = root.Enums;
if (enums != null)
foreach (Enum en in enums)
en.Populate (root);
}
public void EmitCode ()
{
if (type_container_resolve_order != null)
foreach (TypeContainer tc in type_container_resolve_order)
tc.Emit ();
}
//
// Compiling against Standard Libraries property.
//
public bool StdLib {
get {
return stdlib;
}
set {
stdlib = value;
}
}
public ModuleBuilder ModuleBuilder {
get {
return mb;
}
}
//
// Public Field, used to track which method is the public entry
// point.
//
public MethodInfo EntryPoint;
//
// These are used to generate unique names on the structs and fields.
//
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
//
public FieldBuilder MakeStaticData (byte [] data)
{
FieldBuilder fb;
int size = data.Length;
if (impl_details_class == null)
impl_details_class = mb.DefineType (
"", TypeAttributes.NotPublic);
fb = impl_details_class.DefineInitializedData (
"$$field-" + (field_count++), data,
FieldAttributes.Static | FieldAttributes.Assembly);
return fb;
}
}
}