Source Code Cross Referenced for ConstantPool.java in  » Scripting » Pnuts » pnuts » compiler » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » Pnuts » pnuts.compiler 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)ConstantPool.java 1.3 05/06/27
003:         * 
004:         * Copyright (c) 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
005:         * 
006:         * See the file "LICENSE.txt" for information on usage and redistribution of
007:         * this file, and for a DISCLAIMER OF ALL WARRANTIES.
008:         */
009:        package pnuts.compiler;
010:
011:        import java.io.DataOutputStream;
012:        import java.io.IOException;
013:        import java.io.UTFDataFormatException;
014:
015:        class ConstantPool {
016:            private static final int initialSize = 256;
017:
018:            private byte constant_pool[] = new byte[initialSize];
019:
020:            private int top = 0;
021:
022:            private int index = 1;
023:
024:            private ConstantSet utfSet = new ConstantSet(32);
025:
026:            private ConstantSet classSet = new ConstantSet(32);
027:
028:            private ConstantSet fieldRefSet = new ConstantSet(32);
029:
030:            private ConstantSet methodRefSet = new ConstantSet(32);
031:
032:            public short addConstant(int k) {
033:                ensure(5);
034:                constant_pool[top++] = Constants.CONSTANT_Integer;
035:                constant_pool[top++] = (byte) (k >> 24);
036:                constant_pool[top++] = (byte) (k >> 16);
037:                constant_pool[top++] = (byte) (k >> 8);
038:                constant_pool[top++] = (byte) k;
039:                return (short) index++;
040:            }
041:
042:            public short addConstant(long k) {
043:                ensure(9);
044:                constant_pool[top++] = Constants.CONSTANT_Long;
045:                constant_pool[top++] = (byte) (k >> 56);
046:                constant_pool[top++] = (byte) (k >> 48);
047:                constant_pool[top++] = (byte) (k >> 40);
048:                constant_pool[top++] = (byte) (k >> 32);
049:                constant_pool[top++] = (byte) (k >> 24);
050:                constant_pool[top++] = (byte) (k >> 16);
051:                constant_pool[top++] = (byte) (k >> 8);
052:                constant_pool[top++] = (byte) k;
053:                short _index = (short) index;
054:                index += 2;
055:                return _index;
056:            }
057:
058:            short addConstant(float k) {
059:                ensure(5);
060:                constant_pool[top++] = Constants.CONSTANT_Float;
061:                int bits = Float.floatToIntBits(k);
062:                constant_pool[top++] = (byte) (bits >> 24);
063:                constant_pool[top++] = (byte) (bits >> 16);
064:                constant_pool[top++] = (byte) (bits >> 8);
065:                constant_pool[top++] = (byte) bits;
066:                return (short) index++;
067:            }
068:
069:            public short addConstant(double k) {
070:                ensure(9);
071:                constant_pool[top++] = Constants.CONSTANT_Double;
072:                long bits = Double.doubleToLongBits(k);
073:                constant_pool[top++] = (byte) (bits >> 56);
074:                constant_pool[top++] = (byte) (bits >> 48);
075:                constant_pool[top++] = (byte) (bits >> 40);
076:                constant_pool[top++] = (byte) (bits >> 32);
077:                constant_pool[top++] = (byte) (bits >> 24);
078:                constant_pool[top++] = (byte) (bits >> 16);
079:                constant_pool[top++] = (byte) (bits >> 8);
080:                constant_pool[top++] = (byte) bits;
081:                short _index = (short) index;
082:                index += 2;
083:                return _index;
084:            }
085:
086:            public short addConstant(String k) {
087:                Slot slot = utfSet.getSlot(k);
088:                short[] _index = (short[]) slot.value;
089:                if (_index == null) {
090:                    _index = new short[] { (short) index++, (short) -1 };
091:                    slot.value = _index;
092:                    try {
093:                        addUTF(k);
094:                    } catch (UTFDataFormatException e) {
095:                        throw new ClassFileException();
096:                    }
097:                }
098:                if (_index[1] == -1) {
099:                    _index[1] = (short) index++;
100:                    ensure(3);
101:                    constant_pool[top++] = Constants.CONSTANT_String;
102:                    constant_pool[top++] = (byte) (_index[0] >> 8);
103:                    constant_pool[top++] = (byte) _index[0];
104:                }
105:                return _index[1];
106:            }
107:
108:            public void addUTF(String str) throws UTFDataFormatException {
109:                char[] chars = str.toCharArray();
110:                int strlen = chars.length;
111:                int utflen = 0;
112:
113:                for (int i = 0; i < strlen; i++) {
114:                    int c = (int) chars[i];
115:                    if ((c >= 0x0001) && (c <= 0x007F)) {
116:                        utflen++;
117:                    } else if (c > 0x07FF) {
118:                        utflen += 3;
119:                    } else {
120:                        utflen += 2;
121:                    }
122:                }
123:                if (utflen > 0xFFFF) {
124:                    throw new UTFDataFormatException(String.valueOf(str));
125:                }
126:                ensure(utflen + 3);
127:                constant_pool[top++] = Constants.CONSTANT_Utf8;
128:                constant_pool[top++] = (byte) ((utflen >>> 8) & 0xFF);
129:                constant_pool[top++] = (byte) ((utflen >>> 0) & 0xFF);
130:
131:                for (int i = 0; i < strlen; i++) {
132:                    int c = (int) chars[i];
133:                    if ((c >= 0x0001) && (c <= 0x007F)) {
134:                        constant_pool[top++] = (byte) c;
135:                    } else if (c > 0x07FF) {
136:                        constant_pool[top++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
137:                        constant_pool[top++] = (byte) (0x80 | ((c >> 6) & 0x3F));
138:                        constant_pool[top++] = (byte) (0x80 | ((c >> 0) & 0x3F));
139:                    } else {
140:                        constant_pool[top++] = (byte) (0xC0 | ((c >> 6) & 0x1F));
141:                        constant_pool[top++] = (byte) (0x80 | ((c >> 0) & 0x3F));
142:                    }
143:                }
144:            }
145:
146:            public short addUTF8(String str) {
147:                Slot slot = utfSet.getSlot(str);
148:                short[] _index = (short[]) slot.value;
149:                if (_index == null) {
150:                    _index = new short[] { (short) index++, (short) -1 };
151:                    slot.value = _index;
152:                    try {
153:                        addUTF(str);
154:                    } catch (UTFDataFormatException e) {
155:                        throw new ClassFileException();
156:                    }
157:                }
158:                return _index[0];
159:            }
160:
161:            public short addNameAndType(short nameIndex, short typeIndex) {
162:                ensure(5);
163:                constant_pool[top++] = Constants.CONSTANT_NameAndType;
164:                constant_pool[top++] = (byte) (nameIndex >> 8);
165:                constant_pool[top++] = (byte) nameIndex;
166:                constant_pool[top++] = (byte) (typeIndex >> 8);
167:                constant_pool[top++] = (byte) typeIndex;
168:                return (short) index++;
169:            }
170:
171:            short addClass(short classIndex) {
172:                Slot slot = classSet.getSlot(new Short(classIndex));
173:                Short _index = (Short) slot.value;
174:                if (_index == null) {
175:                    ensure(3);
176:                    constant_pool[top++] = Constants.CONSTANT_Class;
177:                    constant_pool[top++] = (byte) (classIndex >> 8);
178:                    constant_pool[top++] = (byte) (classIndex);
179:                    _index = new Short((short) index++);
180:                    slot.value = _index;
181:                }
182:                return _index.shortValue();
183:            }
184:
185:            public short addClass(String className) {
186:                return addClass(addUTF8(className.replace('.', '/')));
187:            }
188:
189:            public short addFieldRef(String className, String fieldName,
190:                    String fieldType) {
191:                Slot slot = fieldRefSet.getSlot(className + " " + fieldName
192:                        + " " + fieldType);
193:
194:                Short _index = (Short) slot.value;
195:                if (_index == null) {
196:                    short nameIndex = addUTF8(fieldName);
197:                    short typeIndex = addUTF8(fieldType);
198:                    short nameAndTypeIndex = addNameAndType(nameIndex,
199:                            typeIndex);
200:                    short classIndex = addClass(className);
201:                    ensure(5);
202:                    constant_pool[top++] = Constants.CONSTANT_Fieldref;
203:                    constant_pool[top++] = (byte) (classIndex >> 8);
204:                    constant_pool[top++] = (byte) classIndex;
205:                    constant_pool[top++] = (byte) (nameAndTypeIndex >> 8);
206:                    constant_pool[top++] = (byte) nameAndTypeIndex;
207:                    _index = new Short((short) index++);
208:                    slot.value = _index;
209:                }
210:                return _index.shortValue();
211:            }
212:
213:            public short addMethodRef(String className, String methodName,
214:                    String fieldType) {
215:                Slot slot = methodRefSet.getSlot(className + " " + methodName
216:                        + " " + fieldType);
217:                Short _index = (Short) slot.value;
218:                if (_index == null) {
219:                    short nameIndex = addUTF8(methodName);
220:                    short typeIndex = addUTF8(fieldType);
221:                    short nameAndTypeIndex = addNameAndType(nameIndex,
222:                            typeIndex);
223:                    short classIndex = addClass(className);
224:                    ensure(5);
225:                    constant_pool[top++] = Constants.CONSTANT_Methodref;
226:                    constant_pool[top++] = (byte) (classIndex >> 8);
227:                    constant_pool[top++] = (byte) classIndex;
228:                    constant_pool[top++] = (byte) (nameAndTypeIndex >> 8);
229:                    constant_pool[top++] = (byte) nameAndTypeIndex;
230:                    _index = new Short((short) index++);
231:                    slot.value = _index;
232:                }
233:                return _index.shortValue();
234:            }
235:
236:            short addInterfaceMethodRef(String className, String methodName,
237:                    String methodType) {
238:                short nameIndex = addUTF8(methodName);
239:                short typeIndex = addUTF8(methodType);
240:                short nameAndTypeIndex = addNameAndType(nameIndex, typeIndex);
241:                short classIndex = addClass(className);
242:                ensure(5);
243:                constant_pool[top++] = Constants.CONSTANT_InterfaceMethodref;
244:                constant_pool[top++] = (byte) (classIndex >> 8);
245:                constant_pool[top++] = (byte) classIndex;
246:                constant_pool[top++] = (byte) (nameAndTypeIndex >> 8);
247:                constant_pool[top++] = (byte) nameAndTypeIndex;
248:                return (short) index++;
249:            }
250:
251:            public void write(ByteBuffer buf) {
252:                buf.add((short) index);
253:                buf.add(constant_pool, 0, top);
254:            }
255:
256:            public void write(DataOutputStream out) throws IOException {
257:                out.writeShort((short) index);
258:                out.write(constant_pool, 0, top);
259:            }
260:
261:            final void ensure(int room) {
262:                if ((top + room) >= constant_pool.length) {
263:                    byte tmp[] = constant_pool;
264:                    constant_pool = new byte[(constant_pool.length * 2) + top
265:                            + room + 1];
266:                    System.arraycopy(tmp, 0, constant_pool, 0, top);
267:                }
268:            }
269:        }
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