1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
|
/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
** $Id$
\* */
package scalac.symtab.classfile;
import scala.tools.util.AbstractFile;
import scala.tools.util.Position;
import scalac.*;
import scalac.util.*;
import scalac.symtab.*;
import scalac.symtab.Scope.SymbolIterator;
import java.io.*;
import java.util.*;
//todo: don't keep statics module in scope.
public class ClassfileParser implements ClassfileConstants {
static final int CLASS_ATTR = SOURCEFILE_ATTR
| INNERCLASSES_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR
| SCALA_ATTR
| JACO_ATTR
| SIG_ATTR;
static final int METH_ATTR = CODE_ATTR
| EXCEPTIONS_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR
| SIG_ATTR
| BRIDGE_ATTR;
static final int FIELD_ATTR = CONSTANT_VALUE_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR
| SIG_ATTR;
protected final Global global;
protected final AbstractFileReader in;
protected final Symbol c;
protected final Symbol m;
protected final Type ctype;
protected final JavaTypeFactory make;
protected final ConstantPool pool;
protected final AttributeParser attrib;
protected final Scope locals;
protected final Scope statics;
private ClassfileParser(Global global, AbstractFileReader in, Symbol c, JavaTypeFactory make, ConstantPool pool) {
this.global = global;
this.in = in;
this.c = c;
this.m = c.linkedModule();
this.ctype = make.classType(c);
this.make = make;
this.pool = pool;
this.attrib = new AttributeParser(in, pool, this);
this.locals = new Scope();
this.statics = new Scope();
}
/** parse the classfile and throw IO exception if there is an
* error in the classfile structure
*/
public static void parse(Global global, AbstractFile file, Symbol c) throws IOException {
AbstractFileReader in = new AbstractFileReader(file);
try {
int magic = in.nextInt();
if (magic != JAVA_MAGIC)
throw new IOException("class file '" + in.path + "' "
+ "has wrong magic number 0x" + Integer.toHexString(magic)
+ ", should be 0x" + Integer.toHexString(JAVA_MAGIC));
int minorVersion = in.nextChar();
int majorVersion = in.nextChar();
if ((majorVersion < JAVA_MAJOR_VERSION) ||
((majorVersion == JAVA_MAJOR_VERSION) &&
(minorVersion < JAVA_MINOR_VERSION)))
throw new IOException("class file '" + in.path + "' "
+ "has unknown version "
+ majorVersion + "." + minorVersion
+ ", should be less than "
+ JAVA_MAJOR_VERSION + "." + JAVA_MINOR_VERSION);
JavaTypeFactory make = new JavaTypeCreator(global.definitions);
Signatures sigs = new Signatures(global, make, in);
ConstantPool pool = new ConstantPool(in, sigs);
int flags = in.nextChar();
Symbol clasz = pool.getClass(in.nextChar());
if (c != clasz)
throw new IOException("class file '" + in.path + "' "
+ "contains wrong class " + clasz.staticType());
new ClassfileParser(global, in, c, make, pool).parse(flags);
} catch (RuntimeException e) {
if (global.debug) e.printStackTrace();
throw new IOException("class file '" + in.path + "' is broken");
}
}
protected void parse(int flags) {
{
// todo: correct flag transition
c.flags = transFlags(flags);
if ((c.flags & Modifiers.DEFERRED) != 0)
c.flags = c.flags & ~Modifiers.DEFERRED | Modifiers.ABSTRACT;
Type supertpe = readClassType(in.nextChar());
Type[] basetpes = new Type[in.nextChar() + 1];
// set info of class
Type classInfo = Type.compoundType(basetpes, locals, c);
c.setInfo(classInfo);
// set info of statics class
Symbol staticsClass = m.moduleClass();
assert staticsClass.isModuleClass(): Debug.show(staticsClass);
Type staticsInfo = Type.compoundType(Type.EMPTY_ARRAY, statics, staticsClass);
staticsClass.setInfo(staticsInfo);
m.setInfo(make.classType(staticsClass));
basetpes[0] = supertpe;
for (int i = 1; i < basetpes.length; i++)
basetpes[i] = readClassType(in.nextChar());
int fieldCount = in.nextChar();
for (int i = 0; i < fieldCount; i++)
parseField();
int methodCount = in.nextChar();
for (int i = 0; i < methodCount; i++)
parseMethod();
Symbol constr = c.primaryConstructor();
if (!constr.isInitialized()) {
constr.setInfo(
Type.MethodType(Symbol.EMPTY_ARRAY, ctype));
if ((c.flags & Modifiers.INTERFACE) == 0)
constr.flags |= Modifiers.PRIVATE;
}
attrib.readAttributes(c, classInfo, CLASS_ATTR);
//System.out.println("dynamic class: " + c);
//System.out.println("statics class: " + staticsClass);
//System.out.println("module: " + m);
//System.out.println("modules class: " + m.type().symbol());
int savedFlags = c.flags;
c.flags |= Modifiers.INITIALIZED;
// hack to make memberType in addInheritedOverloaded work
addInheritedOverloaded();
//if (global.debug) {
// Symbol[] elems = c.members().elements();
// global.log(c + " defines: ");
// for (int i = 0; i < elems.length; i++) {
// global.log(elems[i] + ":" + elems[i].type());
// }
//}
c.flags = savedFlags;
// Add static members of superclass
// todo: remove
Symbol superclass = supertpe.symbol();
if (m.isJava() && superclass.isJava()) {
Symbol mclass = m.moduleClass();
SymbolIterator i = superclass.linkedModule().moduleClass()
.members().iterator();
outer:
while (i.hasNext()) {
Symbol member = i.next();
Symbol current = statics.lookup(member.name);
if (!current.isNone()) {
if (!member.isTerm()) continue outer;
Type info = member.info();
Symbol[] currents = current.alternativeSymbols();
inner:
for (int j = 0; j < currents.length; j++) {
if (currents[j].owner() != mclass)
continue inner;
if (currents[j].info().isSubType(info))
continue outer;
}
}
statics.enterOrOverload(member);
}
}
}
}
private void addInheritedOverloaded() {
Symbol[] elems = c.members().elements();
for (int i = 0; i < elems.length; i++) {
addInheritedOverloaded(elems[i]);
}
}
private void addInheritedOverloaded(Symbol sym) {
if (sym.isMethod() && !sym.isConstructor()) {
sym.addInheritedOverloaded(sym.type());
}
}
/** convert Java modifiers into Scala flags
*/
public int transFlags(int flags) {
int res = 0;
if ((flags & JAVA_ACC_PRIVATE) != 0)
res |= Modifiers.PRIVATE;
else if ((flags & JAVA_ACC_PROTECTED) != 0)
res |= Modifiers.PROTECTED;
else if ((flags & JAVA_ACC_PUBLIC) == 0)
res |= Modifiers.PRIVATE;
if ((flags & JAVA_ACC_ABSTRACT) != 0)
res |= Modifiers.DEFERRED;
if ((flags & JAVA_ACC_FINAL) != 0)
res |= Modifiers.FINAL;
if ((flags & JAVA_ACC_INTERFACE) != 0)
res |= Modifiers.INTERFACE | Modifiers.TRAIT | Modifiers.ABSTRACT;
if ((flags & JAVA_ACC_SYNTHETIC) != 0)
res |= Modifiers.SYNTHETIC;
return res | Modifiers.JAVA;
}
/** read a class name and return the corresponding class type
*/
protected Type readClassType(int i) {
return i == 0 ? make.anyType() : make.classType(pool.getClass(i));
}
/** read a field
*/
protected void parseField() {
int jflags = in.nextChar();
int sflags = transFlags(jflags);
if ((jflags & JAVA_ACC_FINAL) == 0) sflags |= Modifiers.MUTABLE;
if ((sflags & Modifiers.PRIVATE) != 0) {
in.skip(4);
attrib.skipAttributes();
} else {
Name name = pool.getName(in.nextChar());
Symbol owner = getOwner(jflags);
Symbol symbol = owner.newTerm(Position.NOPOS, sflags, name);
Type type = pool.getFieldType(in.nextChar());
symbol.setInfo(type);
attrib.readAttributes(symbol, type, FIELD_ATTR);
getScope(jflags).enterOrOverload(symbol);
}
}
/** read a method
*/
protected void parseMethod() {
int jflags = in.nextChar();
int sflags = transFlags(jflags);
if ((jflags & JAVA_ACC_BRIDGE) != 0) sflags |= Modifiers.PRIVATE;
if ((sflags & Modifiers.PRIVATE) != 0) {
in.skip(4);
attrib.skipAttributes();
} else {
Name name = pool.getName(in.nextChar());
Type type = pool.getMethodType(in.nextChar());
Symbol owner = getOwner(jflags);
Symbol symbol;
boolean newConstructor = false;
if (name == CONSTR_N) {
switch (type) {
case MethodType(Symbol[] vparams, _):
type = Type.MethodType(vparams, ctype);
break;
default:
throw Debug.abort("illegal case", type);
}
symbol = owner.primaryConstructor();
if (symbol.isInitialized()) {
symbol = owner.newConstructor(Position.NOPOS, sflags);
newConstructor = true;
} else {
symbol.flags = sflags;
}
} else {
symbol = owner.newTerm(Position.NOPOS, sflags, name);
}
setParamOwners(type, symbol);
symbol.setInfo(type);
attrib.readAttributes(symbol, type, METH_ATTR);
if (name != CONSTR_N) {
if ((symbol.flags & Modifiers.BRIDGE) == 0)
getScope(jflags).enterOrOverload(symbol);
} else if (newConstructor)
owner.addConstructor(symbol);
}
}
/** return the owner of a member with given java flags
*/
private Symbol getOwner(int jflags) {
return (jflags & JAVA_ACC_STATIC) != 0 ? m.moduleClass() : c;
}
/** return the scope of a member with given java flags
*/
private Scope getScope(int jflags) {
return (jflags & JAVA_ACC_STATIC) != 0 ? statics : locals;
}
private void setParamOwners(Type type, Symbol owner) {
switch (type) {
case PolyType(Symbol[] params, Type result):
for (int i = 0; i < params.length; i++)
params[i].setOwner(owner);
setParamOwners(result, owner);
break;
case MethodType(Symbol[] params, Type result):
for (int i = 0; i < params.length; i++) params[i].setOwner(owner);
setParamOwners(result, owner);
break;
}
}
}
|