1 package org.ibex.classgen;
6 import org.ibex.classgen.util.*;
8 class ConstantPool implements CGConst {
9 private final Hashtable entries = new Hashtable();
10 private Ent[] entriesByIndex; // only valid when stable
12 private int usedSlots = 1; // 0 is reserved
13 private int state = OPEN;
14 private static final int OPEN = 0;
15 private static final int STABLE = 1; // existing entries won't change
16 private static final int SEALED = 2; // no new entries
20 public abstract class Ent {
21 int n; // this is the refcount if state == OPEN, index if >= STABLE
24 Ent(int tag) { this.tag = tag; }
25 void dump(DataOutput o) throws IOException { o.writeByte(tag); }
26 abstract Object _key();
27 final Object key() { return key == null ? (key = _key()) : key; }
28 int slots() { return 1; } // number of slots this ent takes up
30 if(state != OPEN) throw new IllegalStateException("cp is not open");
34 if(state != OPEN) throw new IllegalStateException("cp is not open");
35 if(--n == 0) entries.remove(key());
39 class Utf8Ent extends Ent {
41 Utf8Ent() { super(CONSTANT_UTF8); }
42 Utf8Ent(String s) { this(); this.s = s; }
43 public String toString() { return s; }
44 void dump(DataOutput o) throws IOException { super.dump(o); o.writeUTF(s); }
45 Object _key() { return new Utf8Key(s); }
48 class IntLitEnt extends Ent {
50 IntLitEnt(int i) { super(CONSTANT_INTEGER); this.i = i; }
51 void dump(DataOutput o) throws IOException { super.dump(o); o.writeInt(i); }
52 Object _key() { return new Integer(i); }
54 class FloatLitEnt extends Ent {
56 FloatLitEnt(float f) { super(CONSTANT_FLOAT); this.f = f; }
57 void dump(DataOutput o) throws IOException { super.dump(o); o.writeFloat(f); }
58 Object _key() { return new Float(f); }
60 class LongLitEnt extends Ent {
62 LongLitEnt(long l) { super(CONSTANT_LONG); this.l = l; }
63 void dump(DataOutput o) throws IOException { super.dump(o); o.writeLong(l); }
64 Object _key() { return new Long(l); }
65 int slots() { return 2; }
67 class DoubleLitEnt extends Ent {
69 DoubleLitEnt(double d) { super(CONSTANT_DOUBLE); this.d = d; }
70 void dump(DataOutput o) throws IOException { super.dump(o); o.writeDouble(d); }
71 Object _key() { return new Double(d); }
72 int slots() { return 2; }
74 class StringLitEnt extends Ent {
76 StringLitEnt() { super(CONSTANT_STRING); }
77 StringLitEnt(String s) { this(); this.utf8 = (Utf8Ent)addUtf8(s); }
78 void dump(DataOutput o) throws IOException { super.dump(o); o.writeShort(utf8.n); }
79 Object _key() { return utf8.s; }
80 void unref() { utf8.unref(); super.unref(); }
82 class ClassEnt extends Ent {
84 ClassEnt() { super(CONSTANT_CLASS); }
85 ClassEnt(String s) { this(); this.utf8 = (Utf8Ent) addUtf8(s); }
86 void dump(DataOutput o) throws IOException { super.dump(o); o.writeShort(utf8.n); }
87 Type.Class getTypeClass() { return (Type.Class) key(); }
88 Object _key() { return Type.Class.instance(utf8.s); }
89 void unref() { utf8.unref(); super.unref(); }
90 public String toString() { return "[Class: " + utf8.s + "]"; }
93 class NameAndTypeEnt extends Ent {
97 NameAndTypeEnt() { super(CONSTANT_NAMEANDTYPE); }
98 NameAndTypeEnt(String name, String type) {
100 this.name = (Utf8Ent) addUtf8(name);
101 this.type = (Utf8Ent) addUtf8(type);
103 void dump(DataOutput o) throws IOException { super.dump(o); o.writeShort(name.n); o.writeShort(type.n); }
104 Object _key() { return new NameAndTypeKey(name.s, type.s); }
105 void unref() { name.unref(); type.unref(); super.unref(); }
108 class MemberEnt extends Ent {
110 NameAndTypeEnt member;
112 MemberEnt(int tag) { super(tag); }
113 MemberEnt(int tag, Type.Class klass, String name, String type) {
115 this.klass = (ClassEnt) add(klass);
116 this.member = addNameAndType(name,type);
119 void dump(DataOutput o) throws IOException { super.dump(o); o.writeShort(klass.n); o.writeShort(member.n); }
122 if(member.name == null) throw new Error("should never happen");
124 case CONSTANT_FIELDREF:
125 return klass.getTypeClass().field(member.name.s, member.type.s);
126 case CONSTANT_METHODREF:
127 case CONSTANT_INTERFACEMETHODREF:
128 Type.Class.Method m = klass.getTypeClass().method(member.name.s,member.type.s);
129 return tag == CONSTANT_INTERFACEMETHODREF ? (Object) new InterfaceMethodKey(m) : (Object) m;
131 throw new Error("should never happen");
134 void unref() { klass.unref(); member.unref(); super.unref(); }
140 static class Utf8Key {
142 public Utf8Key(String s) { this.s = s; }
143 public boolean equals(Object o) { return o instanceof Utf8Key && ((Utf8Key)o).s.equals(s); }
144 public int hashCode() { return ~s.hashCode(); }
147 static class NameAndTypeKey {
150 NameAndTypeKey(String name, String type) { this.name = name; this.type = type; }
151 public boolean equals(Object o_) {
152 if (!(o_ instanceof NameAndTypeKey)) return false;
153 NameAndTypeKey o = (NameAndTypeKey) o_;
154 return o.name.equals(name) && o.type.equals(type);
156 public int hashCode() { return name.hashCode() ^ type.hashCode(); }
159 static class InterfaceMethodKey {
160 Type.Class.Method method;
161 InterfaceMethodKey(Type.Class.Method method) { this.method = method; }
162 public int hashCode() { return ~method.hashCode(); }
163 public boolean equals(Object o) { return o instanceof InterfaceMethodKey && ((InterfaceMethodKey)o).method.equals(method); }
170 Ent get(Object o) { return (Ent) entries.get(o); }
171 Utf8Ent getUtf8(String s) { return (Utf8Ent) get(new Utf8Key(s)); }
173 int getIndex(Object o) {
175 if (e == null) throw new IllegalStateException("entry not found");
178 int getUtf8Index(String s) {
180 if (e == null) throw new IllegalStateException("entry not found");
183 int getIndex(Ent ent) {
184 if (state < STABLE) throw new IllegalStateException("constant pool is not stable");
188 Ent getByIndex(int index) {
189 if (state < STABLE) throw new IllegalStateException("constant pool is not stable");
191 if (index >= 65536 || index >= entriesByIndex.length || (e = entriesByIndex[index]) == null)
192 throw new IllegalArgumentException("invalid cp index: " + index + "/" + entriesByIndex.length);
196 String getUtf8KeyByIndex(int index) {
197 Ent e = getByIndex(index);
198 if(!(e instanceof Utf8Ent)) throw new IllegalArgumentException("that isn't a utf8 (" + e.toString() + ")");
199 return ((Utf8Ent)e).s;
202 Object getKeyByIndex(int index) {
203 Ent e = getByIndex(index);
204 return e == null ? null : e.key();
207 NameAndTypeEnt addNameAndType(String name, String descriptor) { return (NameAndTypeEnt) add(new NameAndTypeKey(name, descriptor)); }
208 Utf8Ent addUtf8(String s) { return (Utf8Ent) add(new Utf8Key(s)); }
211 boolean isInterfaceMethod;
212 if (state == SEALED) throw new IllegalStateException("constant pool is sealed");
216 if (state == OPEN) ent.n++;
220 if (o instanceof Type.Class) { ent = new ClassEnt(((Type.Class)o).internalForm()); }
221 else if (o instanceof String) { ent = new StringLitEnt((String)o); }
222 else if (o instanceof Integer) { ent = new IntLitEnt(((Integer)o).intValue()); }
223 else if (o instanceof Float) { ent = new FloatLitEnt(((Float)o).floatValue()); }
224 else if (o instanceof Long) { ent = new LongLitEnt(((Long)o).longValue()); }
225 else if (o instanceof Double) { ent = new DoubleLitEnt(((Double)o).doubleValue()); }
226 else if (o instanceof Utf8Key) { ent = new Utf8Ent(((Utf8Key)o).s); }
227 else if (o instanceof NameAndTypeKey) {
228 NameAndTypeKey key = (NameAndTypeKey) o;
229 ent = new NameAndTypeEnt(key.name,key.type);
231 else if ((isInterfaceMethod = o instanceof InterfaceMethodKey) || o instanceof Type.Class.Member) {
232 Type.Class.Member m = isInterfaceMethod ? ((InterfaceMethodKey)o).method : (Type.Class.Member) o;
233 int tag = isInterfaceMethod ? CONSTANT_INTERFACEMETHODREF
234 : m instanceof Type.Class.Field ? CONSTANT_FIELDREF
235 : m instanceof Type.Class.Method ? CONSTANT_METHODREF
237 if (tag == 0) throw new Error("should never happen");
238 ent = new MemberEnt(tag, m.getDeclaringClass(), m.name, m.getTypeDescriptor());
241 throw new IllegalArgumentException("Unknown type passed to add");
244 int spaces = ent.slots();
245 if (usedSlots + spaces > 65536) throw new ClassFile.Exn("constant pool full");
247 ent.n = state == OPEN ? 1 : usedSlots; // refcount or index
255 int slots() { return usedSlots; }
257 void seal() { state = SEALED; }
259 private Ent[] asArray() {
260 int count = entries.size();
261 Ent[] ents = new Ent[count];
263 Enumeration e = entries.keys();
264 while(e.hasMoreElements()) ents[i++] = (Ent) entries.get(e.nextElement());
265 if (i != count) throw new Error("should never happen");
269 private void assignIndex(Ent[] ents) {
271 entriesByIndex = new Ent[ents.length*2];
272 for(int i=0;i<ents.length;i++) {
275 entriesByIndex[index] = ent;
276 index += ent.slots();
281 if (state != OPEN) return;
283 assignIndex(asArray());
286 private static final Sort.CompareFunc compareFunc = new Sort.CompareFunc() {
287 public int compare(Object a_, Object b_) {
288 return ((Ent)a_).n - ((Ent)b_).n;
292 private static final Sort.CompareFunc reverseCompareFunc = new Sort.CompareFunc() {
293 public int compare(Object a_, Object b_) {
294 return ((Ent)b_).n - ((Ent)a_).n;
299 if (state != OPEN) throw new IllegalStateException("can't optimize a stable constant pool");
300 Ent[] ents = asArray();
301 Sort.sort(ents, reverseCompareFunc);
306 void dump(DataOutput o) throws IOException {
307 Ent[] ents = asArray();
308 Sort.sort(ents, compareFunc);
309 o.writeShort(usedSlots);
310 for(int i=0;i<ents.length;i++) {
311 //System.err.println("" + ents[i].n + ": " + ents[i].toString());
316 ConstantPool(DataInput in) throws ClassFile.ClassReadExn, IOException {
317 usedSlots = in.readUnsignedShort();
318 if (usedSlots==0) throw new ClassFile.ClassReadExn("invalid used slots");
320 // these are to remember the descriptor ents we have to fix up
321 int[] e1s = new int[usedSlots];
322 int[] e2s = new int[usedSlots];
324 entriesByIndex = new Ent[usedSlots];
326 for(int i=1;i<usedSlots;) {
327 byte tag = in.readByte();
330 case CONSTANT_CLASS: // Object Type
332 e1s[i] = in.readUnsignedShort();
334 case CONSTANT_STRING: // String
335 e = new StringLitEnt();
336 e1s[i] = in.readUnsignedShort();
338 case CONSTANT_FIELDREF: // Type.Class.Field
339 case CONSTANT_METHODREF: // Type.Class.Method
340 case CONSTANT_INTERFACEMETHODREF: // Instance Method Ref
341 case CONSTANT_NAMEANDTYPE:
342 e = tag == CONSTANT_NAMEANDTYPE ? (Ent) new NameAndTypeEnt() : (Ent) new MemberEnt(tag);
343 e1s[i] = in.readUnsignedShort();
344 e2s[i] = in.readUnsignedShort();
346 case CONSTANT_INTEGER: // Integer
347 e = new IntLitEnt(in.readInt());
349 case CONSTANT_FLOAT: // Float
350 e = new FloatLitEnt(in.readFloat());
352 case CONSTANT_LONG: // Long
353 e = new LongLitEnt(in.readLong());
355 case CONSTANT_DOUBLE: // Double
356 e = new DoubleLitEnt(in.readDouble());
358 case CONSTANT_UTF8: // Utf8
359 e = new Utf8Ent(in.readUTF());
362 throw new ClassFile.ClassReadExn("invalid cp ent tag: " + tag + " (slot " + i + ")");
364 entriesByIndex[i] = e;
368 for(int i=1;i<usedSlots;) {
369 Ent e = entriesByIndex[i];
370 if (e == null) throw new Error("should never happen: " + i + "/"+usedSlots);
371 boolean isMem = e instanceof MemberEnt;
372 boolean isString = e instanceof StringLitEnt;
373 boolean isClass = e instanceof ClassEnt;
374 boolean isNameAndType = e instanceof NameAndTypeEnt;
375 if (isMem || isClass || isString || isNameAndType) {
376 if (e1s[i] == 0 || e1s[i] >= usedSlots) throw new ClassFile.ClassReadExn("invalid cp index");
377 Ent e1 = entriesByIndex[e1s[i]];
378 if(e1 == null) throw new ClassFile.ClassReadExn("invalid cp index");
380 if(!(e1 instanceof Utf8Ent)) throw new ClassFile.ClassReadExn("expected a uft8ent");
381 ((ClassEnt)e).utf8 = (Utf8Ent) e1;
382 } else if(isString) {
383 if(!(e1 instanceof Utf8Ent)) throw new ClassFile.ClassReadExn("expected a uft8ent");
384 ((StringLitEnt)e).utf8 = (Utf8Ent) e1;
385 } else if(isMem || isNameAndType) {
386 if (e2s[i] == 0 || e2s[i] >= usedSlots) throw new ClassFile.ClassReadExn("invalid cp index");
387 Ent e2 = entriesByIndex[e2s[i]];
389 if(!(e1 instanceof ClassEnt)) throw new ClassFile.ClassReadExn("expected a classent");
390 if(!(e2 instanceof NameAndTypeEnt)) throw new ClassFile.ClassReadExn("expected a nameandtypeent, not " + e2);
391 MemberEnt me = (MemberEnt) e;
392 me.klass = (ClassEnt) e1;
393 me.member = (NameAndTypeEnt) e2;
394 } else if(isNameAndType) {
395 if(!(e1 instanceof Utf8Ent)) throw new ClassFile.ClassReadExn("expected a uft8ent");
396 if(!(e2 instanceof Utf8Ent)) throw new ClassFile.ClassReadExn("expected a uft8ent");
397 NameAndTypeEnt nte = (NameAndTypeEnt) e;
398 nte.name = (Utf8Ent) e1;
399 nte.type = (Utf8Ent) e2;
405 for(int i=1; i<usedSlots;) {
406 Ent e = entriesByIndex[i];
407 entries.put(e.key(), e);