mirror of
https://github.com/Ryujinx/GtkSharp.git
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e48ac63d54
Some virtual methods are passed a native object that is wrapped in an
IDisposable managed object, which is then passed on to the managed
overrides. We need to dispose those objects as soon as possible,
otherwise their native counterpart will not be freed until the next
garbage collection. Requiring the overrides to dispose them would be
cumbersome and error-prone.
Those parameters will now be disposed in a finally {...} block, after
the virtual method has returned. This means that overrides should not
keep a reference to such a parameter outside of the scope of the method,
as it will be diposed when the method returns.
This change only affects Cairo.Context parameter for now, but it was
particularly needed for them, as they could happily hold on to tens of
MBs of memory until the next garbage collection.
423 lines
9.1 KiB
C#
423 lines
9.1 KiB
C#
// GtkSharp.Generation.Parameters.cs - The Parameters Generation Class.
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//
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// Author: Mike Kestner <mkestner@speakeasy.net>
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//
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// Copyright (c) 2001-2003 Mike Kestner
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// Copyright (c) 2004 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.Collections;
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using System.Xml;
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public class Parameter {
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private XmlElement elem;
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public Parameter (XmlElement e)
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{
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elem = e;
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}
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string call_name;
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public string CallName {
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get {
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if (call_name == null)
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return Name;
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else
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return call_name;
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}
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set {
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call_name = value;
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}
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}
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public string CType {
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get {
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string type = elem.GetAttribute("type");
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if (type == "void*")
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type = "gpointer";
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return type;
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}
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}
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public string CSType {
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get {
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string cstype = SymbolTable.Table.GetCSType( elem.GetAttribute("type"));
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if (cstype == "void")
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cstype = "System.IntPtr";
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if (IsArray) {
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if (IsParams)
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cstype = "params " + cstype;
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cstype += "[]";
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cstype = cstype.Replace ("ref ", "");
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}
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return cstype;
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}
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}
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public IGeneratable Generatable {
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get {
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return SymbolTable.Table[CType];
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}
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}
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public bool IsArray {
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get {
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return elem.GetAttributeAsBoolean ("array") || elem.GetAttributeAsBoolean ("null_term_array");
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}
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}
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public bool IsEllipsis {
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get {
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return elem.GetAttributeAsBoolean ("ellipsis");
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}
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}
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internal bool IsOptional {
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get {
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return elem.GetAttributeAsBoolean ("allow-none");
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}
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}
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bool is_count;
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bool is_count_set;
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public bool IsCount {
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get {
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if (is_count_set)
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return is_count;
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if (Name.StartsWith("n_"))
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switch (CSType) {
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case "int":
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case "uint":
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case "long":
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case "ulong":
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case "short":
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case "ushort":
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return true;
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default:
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return false;
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}
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else
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return false;
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}
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set {
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is_count_set = true;
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is_count = value;
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}
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}
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public bool IsDestroyNotify {
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get {
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return CType == "GDestroyNotify";
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}
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}
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public bool IsLength {
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get {
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if (Name.EndsWith("len") || Name.EndsWith("length"))
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switch (CSType) {
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case "int":
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case "uint":
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case "long":
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case "ulong":
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case "short":
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case "ushort":
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return true;
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default:
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return false;
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}
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else
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return false;
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}
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}
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public bool IsParams {
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get {
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return elem.HasAttribute("params");
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}
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}
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public bool IsString {
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get {
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return (CSType == "string");
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}
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}
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public bool IsUserData {
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get {
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return CSType == "IntPtr" && (Name.EndsWith ("data") || Name.EndsWith ("data_or_owner"));
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}
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}
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public virtual string MarshalType {
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get {
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string type = SymbolTable.Table.GetMarshalType( elem.GetAttribute("type"));
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if (type == "void" || Generatable is IManualMarshaler)
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type = "IntPtr";
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if (IsArray) {
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type += "[]";
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type = type.Replace ("ref ", "");
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}
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return type;
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}
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}
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public string Name {
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get {
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return SymbolTable.Table.MangleName (elem.GetAttribute("name"));
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}
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}
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public bool IsOwnable {
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get {
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return this.Generatable is OwnableGen;
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}
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}
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public bool Owned {
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get {
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return elem.GetAttribute ("owned") == "true";
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}
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}
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public virtual string NativeSignature {
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get {
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string sig = MarshalType + " " + Name;
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if (PassAs != String.Empty)
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sig = PassAs + " " + sig;
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return sig;
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}
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}
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public string PropertyName {
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get {
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return elem.GetAttribute("property_name");
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}
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}
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string pass_as;
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public string PassAs {
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get {
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if (pass_as != null)
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return pass_as;
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if (elem.HasAttribute ("pass_as"))
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return elem.GetAttribute ("pass_as");
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if (IsArray || CSType.EndsWith ("IntPtr"))
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return "";
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if (CType.EndsWith ("*") && (Generatable is SimpleGen || Generatable is EnumGen))
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return "out";
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return "";
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}
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set {
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pass_as = value;
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}
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}
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string scope;
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public string Scope {
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get {
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if (scope == null)
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scope = elem.GetAttribute ("scope");
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return scope;
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}
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set {
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scope = value;
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}
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}
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int closure = -1;
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public int Closure {
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get {
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if(closure == -1 && elem.HasAttribute ("closure"))
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closure = int.Parse(elem.GetAttribute ("closure"));
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return closure;
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}
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set {
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closure = value;
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}
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}
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int destroynotify = -1;
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public int DestroyNotify {
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get {
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if (destroynotify == -1 && elem.HasAttribute ("destroy"))
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destroynotify = int.Parse (elem.GetAttribute ("destroy"));
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return destroynotify;
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}
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set {
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destroynotify = value;
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}
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}
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public bool IsHidden {
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get {
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return elem.GetAttributeAsBoolean ("hidden");
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}
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}
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public virtual string[] Prepare {
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get {
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IGeneratable gen = Generatable;
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if (gen is IManualMarshaler) {
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string result = "IntPtr native_" + CallName;
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if (PassAs != "out")
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result += " = " + (gen as IManualMarshaler).AllocNative (CallName);
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return new string [] { result + ";" };
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} else if (PassAs == "out" && CSType != MarshalType) {
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return new string [] { gen.MarshalType + " native_" + CallName + ";" };
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} else if (PassAs == "ref" && CSType != MarshalType) {
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return new string [] { gen.MarshalType + " native_" + CallName + " = (" + gen.MarshalType + ") " + CallName + ";" };
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}
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return new string [0];
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}
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}
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public virtual string CallString {
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get {
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string call_parm;
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IGeneratable gen = Generatable;
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if (gen is CallbackGen)
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return SymbolTable.Table.CallByName (CType, CallName + "_wrapper");
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else if (PassAs != String.Empty) {
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call_parm = PassAs + " ";
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if (CSType != MarshalType)
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call_parm += "native_";
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call_parm += CallName;
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} else if (gen is IManualMarshaler)
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call_parm = "native_" + CallName;
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else if (gen is ObjectBase)
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call_parm = (gen as ObjectBase).CallByName (CallName, Owned);
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else
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call_parm = gen.CallByName (CallName);
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return call_parm;
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}
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}
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public virtual string[] Finish {
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get {
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IGeneratable gen = Generatable;
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if (gen is IManualMarshaler) {
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string[] result = new string [PassAs == "ref" ? 2 : 1];
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int i = 0;
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if (PassAs != String.Empty)
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result [i++] = CallName + " = " + Generatable.FromNative ("native_" + CallName) + ";";
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if (PassAs != "out")
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result [i] = (gen as IManualMarshaler).ReleaseNative ("native_" + CallName) + ";";
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return result;
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} else if (PassAs != String.Empty && MarshalType != CSType)
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if (gen is IOwnable)
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return new string [] { CallName + " = " + (gen as IOwnable).FromNative ("native_" + CallName, Owned) + ";" };
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else
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return new string [] { CallName + " = " + gen.FromNative ("native_" + CallName) + ";" };
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return new string [0];
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}
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}
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public string FromNative (string var)
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{
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if (Generatable == null)
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return String.Empty;
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else if (Generatable is IOwnable)
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return ((IOwnable)Generatable).FromNative (var, Owned);
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else
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return Generatable.FromNative (var);
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}
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public string StudlyName {
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get {
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string name = elem.GetAttribute("name");
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string[] segs = name.Split('_');
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string studly = "";
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foreach (string s in segs) {
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if (s.Trim () == "")
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continue;
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studly += (s.Substring(0,1).ToUpper() + s.Substring(1));
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}
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return studly;
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}
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}
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}
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public class ErrorParameter : Parameter {
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public ErrorParameter (XmlElement elem) : base (elem)
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{
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PassAs = "out";
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}
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public override string CallString {
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get {
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return "out error";
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}
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}
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}
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public class StructParameter : Parameter {
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public StructParameter (XmlElement elem) : base (elem) {}
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public override string MarshalType {
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get {
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return "IntPtr";
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}
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}
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public override string[] Prepare {
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get {
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if (PassAs == "out")
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return new string [] { "IntPtr native_" + CallName + " = Marshal.AllocHGlobal (Marshal.SizeOf (typeof (" + Generatable.QualifiedName + ")));"};
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else
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return new string [] { "IntPtr native_" + CallName + " = " + (Generatable as IManualMarshaler).AllocNative (CallName) + ";"};
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}
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}
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public override string CallString {
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get {
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return "native_" + CallName;
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}
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}
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public override string[] Finish {
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get {
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string[] result = new string [2];
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result [0] = CallName + " = " + FromNative ("native_" + CallName) + ";";
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result [1] = (Generatable as IManualMarshaler).ReleaseNative ("native_" + CallName) + ";";
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return result;
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}
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}
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public override string NativeSignature {
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get {
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return "IntPtr " + CallName;
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}
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}
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}
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}
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