1 cananian 1.1.2.1 // INClassLoader.java, created Thu Jan 27 22:18:13 1999 by cananian
2 cananian 1.1.2.1 // Copyright (C) 1999 C. Scott Ananian <cananian@alumni.princeton.edu>
3 cananian 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 cananian 1.1.2.1 package harpoon.Interpret.Quads;
5 cananian 1.1.2.1
6 cananian 1.1.2.1 import harpoon.ClassFile.HClass;
7 cananian 1.1.2.1 import harpoon.ClassFile.HField;
8 cananian 1.1.2.1 import harpoon.ClassFile.HMethod;
9 cananian 1.1.2.4 import harpoon.ClassFile.Loader;
10 cananian 1.1.2.2 import harpoon.ClassFile.NoSuchClassException;
11 cananian 1.1.2.1
12 cananian 1.1.2.4 import java.io.InputStream;
13 cananian 1.1.2.4
14 cananian 1.1.2.1 /**
15 cananian 1.1.2.1 * <code>INClassLoader</code> provides implementations for (some of) the native
16 cananian 1.1.2.1 * methods in <code>java.lang.ClassLoader</code> and
17 cananian 1.1.2.1 * <code>java.lang.ClassLoader.NativeLibrary</code>.
18 cananian 1.1.2.1 *
19 cananian 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
20 cananian 1.2 * @version $Id: INClassLoader.java,v 1.2 2002/02/25 21:05:45 cananian Exp $
21 cananian 1.1.2.1 */
22 cananian 1.1.2.1 public class INClassLoader {
23 cananian 1.1.2.1 static final void register(StaticState ss) {
24 cananian 1.1.2.4 try{ ss.register(findSystemClass0(ss)); } catch (NoSuchMethodError e){}
25 cananian 1.1.2.4 /*try*/{ ss.register(getSystemResourceAsStream0(ss)); }/* catch (NoSuchMethodError e) {}*/
26 cananian 1.1.2.4 try{ ss.register(init(ss)); } catch (NoSuchMethodError e) {}
27 cananian 1.1.2.1 // JDK 1.2 only
28 cananian 1.1.2.3 try{ss.register(getCallerClassLoader(ss));}catch(NoSuchMethodError e){}
29 cananian 1.1.2.2 try { // the following are ClassLoader.NativeLibrary methods.
30 cananian 1.1.2.1 try { ss.register(NLload(ss)); } catch (NoSuchMethodError e) {}
31 cananian 1.1.2.1 try { ss.register(NLunload(ss)); } catch (NoSuchMethodError e) {}
32 cananian 1.1.2.2 } catch (NoSuchClassException e) { /* ignore */ }
33 cananian 1.1.2.4 }
34 cananian 1.1.2.4 // ClassLoader.findSystemClass0 behaves (in our implementation) exactly
35 cananian 1.1.2.4 // like Class.forName
36 cananian 1.1.2.4 private static final NativeMethod findSystemClass0(StaticState ss0) {
37 cananian 1.1.2.4 final HClass hc = ss0.linker.forName("java.lang.ClassLoader");
38 cananian 1.1.2.4 final HMethod hm =
39 cananian 1.1.2.4 hc.getMethod("findSystemClass0", new HClass[] { ss0.HCstring } );
40 cananian 1.1.2.4 return new NativeMethod() {
41 cananian 1.1.2.4 HMethod getMethod() { return hm; }
42 cananian 1.1.2.4 // implementation borrowed from INClass.forName
43 cananian 1.1.2.4 // throws ClassNotFoundException
44 cananian 1.1.2.4 Object invoke(StaticState ss, Object[] params)
45 cananian 1.1.2.4 throws InterpretedThrowable {
46 cananian 1.1.2.4 // params[0] is 'this' because findSystemClass is non-static
47 cananian 1.1.2.4 String clsname = ss.ref2str((ObjectRef)params[1]);
48 cananian 1.1.2.4 try {
49 cananian 1.1.2.4 return INClass.forClass(ss, ss.linker.forName(clsname));
50 cananian 1.1.2.4 } catch (NoSuchClassException e) {
51 cananian 1.1.2.4 ObjectRef obj = ss.makeThrowable(ss.HCclassnotfoundE);
52 cananian 1.1.2.4 throw new InterpretedThrowable(obj, ss);
53 cananian 1.1.2.4 }
54 cananian 1.1.2.4 }
55 cananian 1.1.2.4 };
56 cananian 1.1.2.4 }
57 cananian 1.1.2.4 // getSystemResourceAsStream0 is identical in functionality to
58 cananian 1.1.2.4 // Loader.getResourceAsStream(). But we must wrap the result.
59 cananian 1.1.2.4 private static final NativeMethod getSystemResourceAsStream0(StaticState ss0) {
60 cananian 1.1.2.4 final HClass hc = ss0.linker.forName("java.lang.ClassLoader");
61 cananian 1.1.2.4 final HMethod hm =
62 cananian 1.1.2.4 hc.getMethod("getSystemResourceAsStream0", new HClass[] { ss0.HCstring } );
63 cananian 1.1.2.4 return new NativeMethod() {
64 cananian 1.1.2.4 HMethod getMethod() { return hm; }
65 cananian 1.1.2.4 Object invoke(StaticState ss, Object[] params) {
66 cananian 1.1.2.4 String resname = ss.ref2str((ObjectRef)params[0]);
67 cananian 1.1.2.4 InputStream is = Loader.getResourceAsStream(resname);
68 cananian 1.1.2.4 if (is==null) return null; // unsuccessful.
69 cananian 1.1.2.4 // okay, now create new 'interpreted' FileInputStream from
70 cananian 1.1.2.4 // the real one.
71 cananian 1.1.2.4 return INFileInputStream.openInputStream(ss, is);
72 cananian 1.1.2.4 }
73 cananian 1.1.2.4 };
74 cananian 1.1.2.4 }
75 cananian 1.1.2.4 // do-nothing 'init' method (initialization of class loader)
76 cananian 1.1.2.4 private static final NativeMethod init(StaticState ss0) {
77 cananian 1.1.2.4 final HClass hc = ss0.linker.forName("java.lang.ClassLoader");
78 cananian 1.1.2.4 final HMethod hm =
79 cananian 1.1.2.4 hc.getMethod("init", new HClass[0] );
80 cananian 1.1.2.4 return new NativeMethod() {
81 cananian 1.1.2.4 HMethod getMethod() { return hm; }
82 cananian 1.1.2.4 Object invoke(StaticState ss, Object[] params) {
83 cananian 1.1.2.4 // do nothing.
84 cananian 1.1.2.4 return null;
85 cananian 1.1.2.4 }
86 cananian 1.1.2.4 };
87 cananian 1.1.2.1 }
88 cananian 1.1.2.3 // Returns the caller's class loader
89 cananian 1.1.2.3 private static final NativeMethod getCallerClassLoader(StaticState ss0) {
90 cananian 1.1.2.3 final HClass hc = ss0.linker.forName("java.lang.ClassLoader");
91 cananian 1.1.2.3 final HMethod hm =
92 cananian 1.1.2.3 hc.getMethod("getCallerClassLoader", new HClass[0] );
93 cananian 1.1.2.3 return new NativeMethod() {
94 cananian 1.1.2.3 HMethod getMethod() { return hm; }
95 cananian 1.1.2.3 Object invoke(StaticState ss, Object[] params) {
96 cananian 1.1.2.3 // always return null.
97 cananian 1.1.2.3 return null;
98 cananian 1.1.2.3 }
99 cananian 1.1.2.3 };
100 cananian 1.1.2.3 }
101 cananian 1.1.2.3
102 cananian 1.1.2.3 // ------------ ClassLoader.NativeLibrary implementations ---------
103 cananian 1.1.2.3
104 cananian 1.1.2.1 static long handle=0; // help make unique non-zero handles
105 cananian 1.1.2.1 // Load the named native library.
106 cananian 1.1.2.1 private static final NativeMethod NLload(StaticState ss0) {
107 cananian 1.1.2.1 final HClass hc =
108 cananian 1.1.2.1 ss0.linker.forName("java.lang.ClassLoader$NativeLibrary");
109 cananian 1.1.2.1 final HMethod hm =
110 cananian 1.1.2.1 hc.getMethod("load", new HClass[] { ss0.HCstring } );
111 cananian 1.1.2.1 final HField handleF = hc.getField("handle");
112 cananian 1.1.2.1 return new NativeMethod() {
113 cananian 1.1.2.1 HMethod getMethod() { return hm; }
114 cananian 1.1.2.1 Object invoke(StaticState ss, Object[] params) {
115 cananian 1.1.2.1 ObjectRef _this = (ObjectRef) params[0];
116 cananian 1.1.2.1 ObjectRef _name = (ObjectRef) params[1];
117 cananian 1.1.2.1 String name = ss.ref2str(_name);
118 cananian 1.1.2.1 System.err.println("LOADING NATIVE LIBRARY "+name);
119 cananian 1.1.2.1 // don't actually load it; just do nothing.
120 cananian 1.1.2.1 // we have to set the handle to be non-zero, though.
121 cananian 1.1.2.1 _this.update(handleF, new Long(++handle));
122 cananian 1.1.2.1 return null;
123 cananian 1.1.2.1 }
124 cananian 1.1.2.1 };
125 cananian 1.1.2.1 }
126 cananian 1.1.2.1 // Unload the named native library.
127 cananian 1.1.2.1 private static final NativeMethod NLunload(StaticState ss0) {
128 cananian 1.1.2.1 final HClass hc =
129 cananian 1.1.2.1 ss0.linker.forName("java.lang.ClassLoader$NativeLibrary");
130 cananian 1.1.2.1 final HMethod hm =
131 cananian 1.1.2.1 hc.getMethod("unload", new HClass[0] );
132 cananian 1.1.2.1 final HField nameF = hc.getField("name");
133 cananian 1.1.2.1 final HField handleF = hc.getField("handle");
134 cananian 1.1.2.1 return new NativeMethod() {
135 cananian 1.1.2.1 HMethod getMethod() { return hm; }
136 cananian 1.1.2.1 Object invoke(StaticState ss, Object[] params) {
137 cananian 1.1.2.1 ObjectRef _this = (ObjectRef) params[0];
138 cananian 1.1.2.1 ObjectRef _name = (ObjectRef) _this.get(nameF);
139 cananian 1.1.2.1 String name = ss.ref2str(_name);
140 cananian 1.1.2.1 System.err.println("UNLOADING NATIVE LIBRARY "+name);
141 cananian 1.1.2.1 // don't actually unload it; just do nothing.
142 cananian 1.1.2.1 // we will clear the handle field to zero, though.
143 cananian 1.1.2.1 _this.update(handleF, new Long(0));
144 cananian 1.1.2.1 return null;
145 cananian 1.1.2.1 }
146 cananian 1.1.2.1 };
147 cananian 1.1.2.1 }
148 cananian 1.2 }