mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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306 lines
9.8 KiB
C#
306 lines
9.8 KiB
C#
// GtkSharp.Generation.CallbackGen.cs - The Callback Generatable.
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//
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// Author: Mike Kestner <mkestner@novell.com>
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//
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// Copyright (c) 2002-2003 Mike Kestner
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// Copyright (c) 2007 Novell, Inc.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the GNU General Public
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// License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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namespace GtkSharp.Generation {
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using System;
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using System.IO;
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using System.Xml;
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public class CallbackGen : GenBase, IAccessor {
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private Parameters parms;
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private Signature sig = null;
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private ReturnValue retval;
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private bool valid = true;
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public CallbackGen (XmlElement ns, XmlElement elem) : base (ns, elem)
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{
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retval = new ReturnValue (elem ["return-type"]);
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parms = new Parameters (elem ["parameters"]);
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parms.HideData = true;
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}
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public override string DefaultValue {
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get { return "null"; }
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}
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public override bool Validate ()
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{
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if (!retval.Validate ()) {
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Console.WriteLine ("rettype: " + retval.CType + " in callback " + CName);
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Statistics.ThrottledCount++;
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valid = false;
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return false;
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}
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if (!parms.Validate ()) {
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Console.WriteLine (" in callback " + CName);
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Statistics.ThrottledCount++;
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valid = false;
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return false;
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}
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valid = true;
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return true;
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}
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public string InvokerName {
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get {
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if (!valid)
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return String.Empty;
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return NS + "Sharp." + Name + "Invoker";
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}
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}
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public override string MarshalType {
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get {
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if (valid)
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return NS + "Sharp." + Name + "Native";
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else
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return "";
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}
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}
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public override string CallByName (string var_name)
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{
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return var_name + ".NativeDelegate";
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}
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public override string FromNative (string var)
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{
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return NS + "Sharp." + Name + "Wrapper.GetManagedDelegate (" + var + ")";
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}
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public void WriteAccessors (StreamWriter sw, string indent, string var)
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{
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sw.WriteLine (indent + "get {");
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sw.WriteLine (indent + "\treturn " + FromNative (var) + ";");
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sw.WriteLine (indent + "}");
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}
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string CastFromInt (string type)
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{
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return type != "int" ? "(" + type + ") " : "";
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}
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string InvokeString {
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get {
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if (parms.Count == 0)
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return String.Empty;
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string[] result = new string [parms.Count];
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for (int i = 0; i < parms.Count; i++) {
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Parameter p = parms [i];
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IGeneratable igen = p.Generatable;
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if (i > 0 && parms [i - 1].IsString && p.IsLength) {
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string string_name = parms [i - 1].Name;
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result[i] = igen.CallByName (CastFromInt (p.CSType) + "System.Text.Encoding.UTF8.GetByteCount (" + string_name + ")");
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continue;
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}
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p.CallName = p.Name;
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result [i] = p.CallString;
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if (p.IsUserData)
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result [i] = "__data";
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}
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return String.Join (", ", result);
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}
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}
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MethodBody body;
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void GenInvoker (GenerationInfo gen_info, StreamWriter sw)
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{
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if (sig == null)
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sig = new Signature (parms);
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sw.WriteLine ("\tinternal class " + Name + "Invoker {");
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sw.WriteLine ();
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sw.WriteLine ("\t\t" + Name + "Native native_cb;");
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sw.WriteLine ("\t\tIntPtr __data;");
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sw.WriteLine ("\t\tGLib.DestroyNotify __notify;");
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sw.WriteLine ();
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sw.WriteLine ("\t\t~" + Name + "Invoker ()");
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sw.WriteLine ("\t\t{");
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sw.WriteLine ("\t\t\tif (__notify == null)");
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sw.WriteLine ("\t\t\t\treturn;");
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sw.WriteLine ("\t\t\t__notify (__data);");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ();
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sw.WriteLine ("\t\tinternal " + Name + "Invoker (" + Name + "Native native_cb) : this (native_cb, IntPtr.Zero, null) {}");
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sw.WriteLine ();
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sw.WriteLine ("\t\tinternal " + Name + "Invoker (" + Name + "Native native_cb, IntPtr data) : this (native_cb, data, null) {}");
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sw.WriteLine ();
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sw.WriteLine ("\t\tinternal " + Name + "Invoker (" + Name + "Native native_cb, IntPtr data, GLib.DestroyNotify notify)");
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sw.WriteLine ("\t\t{");
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sw.WriteLine ("\t\t\tthis.native_cb = native_cb;");
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sw.WriteLine ("\t\t\t__data = data;");
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sw.WriteLine ("\t\t\t__notify = notify;");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ();
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sw.WriteLine ("\t\tinternal " + QualifiedName + " Handler {");
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sw.WriteLine ("\t\t\tget {");
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sw.WriteLine ("\t\t\t\treturn new " + QualifiedName + "(InvokeNative);");
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sw.WriteLine ("\t\t\t}");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ();
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sw.WriteLine ("\t\t" + retval.CSType + " InvokeNative (" + sig + ")");
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sw.WriteLine ("\t\t{");
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body.Initialize (gen_info);
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string call = "native_cb (" + InvokeString + ")";
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if (retval.IsVoid)
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sw.WriteLine ("\t\t\t" + call + ";");
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else
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sw.WriteLine ("\t\t\t" + retval.CSType + " result = " + retval.FromNative (call) + ";");
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body.Finish (sw, String.Empty);
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if (!retval.IsVoid)
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sw.WriteLine ("\t\t\treturn result;");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ("\t}");
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sw.WriteLine ();
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}
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public string GenWrapper (GenerationInfo gen_info)
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{
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string wrapper = Name + "Native";
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string qualname = MarshalType;
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if (!Validate ())
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return String.Empty;
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body = new MethodBody (parms);
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StreamWriter save_sw = gen_info.Writer;
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StreamWriter sw = gen_info.Writer = gen_info.OpenStream (qualname);
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sw.WriteLine ("namespace " + NS + "Sharp {");
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sw.WriteLine ();
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sw.WriteLine ("\tusing System;");
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sw.WriteLine ("\tusing System.Runtime.InteropServices;");
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sw.WriteLine ();
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sw.WriteLine ("#region Autogenerated code");
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sw.WriteLine ("\t[GLib.CDeclCallback]");
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sw.WriteLine ("\tinternal delegate " + retval.MarshalType + " " + wrapper + "(" + parms.ImportSignature + ");");
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sw.WriteLine ();
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GenInvoker (gen_info, sw);
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sw.WriteLine ("\tinternal class " + Name + "Wrapper {");
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sw.WriteLine ();
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ManagedCallString call = new ManagedCallString (parms);
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sw.WriteLine ("\t\tpublic " + retval.MarshalType + " NativeCallback (" + parms.ImportSignature + ")");
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sw.WriteLine ("\t\t{");
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string unconditional = call.Unconditional ("\t\t\t");
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if (unconditional.Length > 0)
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sw.WriteLine (unconditional);
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sw.WriteLine ("\t\t\ttry {");
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string call_setup = call.Setup ("\t\t\t\t");
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if (call_setup.Length > 0)
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sw.WriteLine (call_setup);
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if (retval.CSType == "void")
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sw.WriteLine ("\t\t\t\tmanaged ({0});", call);
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else
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sw.WriteLine ("\t\t\t\t{0} __ret = managed ({1});", retval.CSType, call);
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string finish = call.Finish ("\t\t\t\t");
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if (finish.Length > 0)
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sw.WriteLine (finish);
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sw.WriteLine ("\t\t\t\tif (release_on_call)\n\t\t\t\t\tgch.Free ();");
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if (retval.CSType != "void")
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sw.WriteLine ("\t\t\t\treturn {0};", retval.ToNative ("__ret"));
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/* If the function expects one or more "out" parameters(error parameters are excluded) or has a return value different from void and bool, exceptions
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* thrown in the managed function have to be considered fatal meaning that an exception is to be thrown and the function call cannot not return
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*/
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bool fatal = (retval.MarshalType != "void" && retval.MarshalType != "bool") || call.HasOutParam;
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sw.WriteLine ("\t\t\t} catch (Exception e) {");
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sw.WriteLine ("\t\t\t\tGLib.ExceptionManager.RaiseUnhandledException (e, " + (fatal ? "true" : "false") + ");");
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if (fatal) {
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sw.WriteLine ("\t\t\t\t// NOTREACHED: Above call does not return.");
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sw.WriteLine ("\t\t\t\tthrow e;");
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} else if (retval.MarshalType == "bool") {
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sw.WriteLine ("\t\t\t\treturn false;");
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}
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sw.WriteLine ("\t\t\t}");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ();
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sw.WriteLine ("\t\tbool release_on_call = false;");
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sw.WriteLine ("\t\tGCHandle gch;");
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sw.WriteLine ();
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sw.WriteLine ("\t\tpublic void PersistUntilCalled ()");
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sw.WriteLine ("\t\t{");
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sw.WriteLine ("\t\t\trelease_on_call = true;");
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sw.WriteLine ("\t\t\tgch = GCHandle.Alloc (this);");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ();
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sw.WriteLine ("\t\tinternal " + wrapper + " NativeDelegate;");
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sw.WriteLine ("\t\t" + NS + "." + Name + " managed;");
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sw.WriteLine ();
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sw.WriteLine ("\t\tpublic " + Name + "Wrapper (" + NS + "." + Name + " managed)");
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sw.WriteLine ("\t\t{");
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sw.WriteLine ("\t\t\tthis.managed = managed;");
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sw.WriteLine ("\t\t\tif (managed != null)");
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sw.WriteLine ("\t\t\t\tNativeDelegate = new " + wrapper + " (NativeCallback);");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ();
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sw.WriteLine ("\t\tpublic static " + NS + "." + Name + " GetManagedDelegate (" + wrapper + " native)");
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sw.WriteLine ("\t\t{");
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sw.WriteLine ("\t\t\tif (native == null)");
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sw.WriteLine ("\t\t\t\treturn null;");
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sw.WriteLine ("\t\t\t" + Name + "Wrapper wrapper = (" + Name + "Wrapper) native.Target;");
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sw.WriteLine ("\t\t\tif (wrapper == null)");
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sw.WriteLine ("\t\t\t\treturn null;");
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sw.WriteLine ("\t\t\treturn wrapper.managed;");
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sw.WriteLine ("\t\t}");
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sw.WriteLine ("\t}");
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sw.WriteLine ("#endregion");
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sw.WriteLine ("}");
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sw.Close ();
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gen_info.Writer = save_sw;
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return NS + "Sharp." + Name + "Wrapper";
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}
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public override void Generate (GenerationInfo gen_info)
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{
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gen_info.CurrentType = Name;
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sig = new Signature (parms);
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StreamWriter sw = gen_info.OpenStream (Name);
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sw.WriteLine ("namespace " + NS + " {");
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sw.WriteLine ();
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sw.WriteLine ("\tusing System;");
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sw.WriteLine ();
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sw.WriteLine ("\t{0} delegate " + retval.CSType + " " + Name + "(" + sig.ToString() + ");", IsInternal ? "internal" : "public");
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sw.WriteLine ();
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sw.WriteLine ("}");
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sw.Close ();
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GenWrapper (gen_info);
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Statistics.CBCount++;
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}
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}
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}
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