Source Code Cross Referenced for CheckClassAdapter.java in  » IDE » tIDE » org » objectweb » asm » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » tIDE » org.objectweb.asm.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /***
002:         * ASM: a very small and fast Java bytecode manipulation framework
003:         * Copyright (c) 2000-2005 INRIA, France Telecom
004:         * All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         * 2. Redistributions in binary form must reproduce the above copyright
012:         *    notice, this list of conditions and the following disclaimer in the
013:         *    documentation and/or other materials provided with the distribution.
014:         * 3. Neither the name of the copyright holders nor the names of its
015:         *    contributors may be used to endorse or promote products derived from
016:         *    this software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
022:         * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
024:         * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
025:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
026:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
027:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
028:         * THE POSSIBILITY OF SUCH DAMAGE.
029:         */package org.objectweb.asm.util;
030:
031:        import java.io.FileInputStream;
032:        import java.io.PrintWriter;
033:        import java.util.List;
034:
035:        import org.objectweb.asm.AnnotationVisitor;
036:        import org.objectweb.asm.FieldVisitor;
037:        import org.objectweb.asm.ClassAdapter;
038:        import org.objectweb.asm.ClassReader;
039:        import org.objectweb.asm.ClassVisitor;
040:        import org.objectweb.asm.MethodVisitor;
041:        import org.objectweb.asm.Opcodes;
042:        import org.objectweb.asm.Attribute;
043:        import org.objectweb.asm.Type;
044:        import org.objectweb.asm.tree.MethodNode;
045:        import org.objectweb.asm.tree.ClassNode;
046:        import org.objectweb.asm.tree.TryCatchBlockNode;
047:        import org.objectweb.asm.tree.analysis.Analyzer;
048:        import org.objectweb.asm.tree.analysis.SimpleVerifier;
049:        import org.objectweb.asm.tree.analysis.Frame;
050:
051:        /**
052:         * A {@link ClassAdapter} that checks that its methods are properly used. More
053:         * precisely this class adapter checks each method call individually, based
054:         * <i>only</i> on its arguments, but does <i>not</i> check the <i>sequence</i>
055:         * of method calls. For example, the invalid sequence
056:         * <tt>visitField(ACC_PUBLIC, "i", "I", null)</tt> <tt>visitField(ACC_PUBLIC,
057:         * "i", "D", null)</tt>
058:         * will <i>not</i> be detected by this class adapter.
059:         *
060:         * @author Eric Bruneton
061:         */
062:        public class CheckClassAdapter extends ClassAdapter {
063:
064:            /**
065:             * <tt>true</tt> if the visit method has been called.
066:             */
067:            private boolean start;
068:
069:            /**
070:             * <tt>true</tt> if the visitSource method has been called.
071:             */
072:            private boolean source;
073:
074:            /**
075:             * <tt>true</tt> if the visitOuterClass method has been called.
076:             */
077:            private boolean outer;
078:
079:            /**
080:             * <tt>true</tt> if the visitEnd method has been called.
081:             */
082:            private boolean end;
083:
084:            /**
085:             * Checks a given class. <p> Usage: CheckClassAdapter &lt;fully qualified
086:             * class name or class file name&gt;
087:             *
088:             * @param args the command line arguments.
089:             *
090:             * @throws Exception if the class cannot be found, or if an IO exception
091:             *         occurs.
092:             */
093:            public static void main(final String[] args) throws Exception {
094:                if (args.length != 1) {
095:                    System.err.println("Verifies the given class.");
096:                    System.err
097:                            .println("Usage: CheckClassAdapter "
098:                                    + "<fully qualified class name or class file name>");
099:                    return;
100:                }
101:                ClassReader cr;
102:                if (args[0].endsWith(".class")) {
103:                    cr = new ClassReader(new FileInputStream(args[0]));
104:                } else {
105:                    cr = new ClassReader(args[0]);
106:                }
107:
108:                verify(cr, false, new PrintWriter(System.err));
109:            }
110:
111:            /**
112:             * Checks a given class
113:             *
114:             * @param cr a <code>ClassReader</code> that contains bytecode for the
115:             *        analysis.
116:             * @param dump true if bytecode should be printed out not only when errors
117:             *        are found.
118:             * @param pw write where results going to be printed
119:             */
120:            public static void verify(final ClassReader cr, final boolean dump,
121:                    final PrintWriter pw) {
122:                ClassNode cn = new ClassNode();
123:                cr.accept(new CheckClassAdapter(cn), ClassReader.SKIP_DEBUG);
124:
125:                List methods = cn.methods;
126:                for (int i = 0; i < methods.size(); ++i) {
127:                    MethodNode method = (MethodNode) methods.get(i);
128:                    if (method.instructions.size() > 0) {
129:                        Analyzer a = new Analyzer(new SimpleVerifier(Type
130:                                .getType("L" + cn.name + ";"), Type.getType("L"
131:                                + cn.super Name + ";"), false));
132:                        try {
133:                            a.analyze(cn.name, method);
134:                            if (!dump) {
135:                                continue;
136:                            }
137:                        } catch (Exception e) {
138:                            e.printStackTrace();
139:                        }
140:                        Frame[] frames = a.getFrames();
141:
142:                        TraceMethodVisitor mv = new TraceMethodVisitor();
143:
144:                        pw.println(method.name + method.desc);
145:                        for (int j = 0; j < method.instructions.size(); ++j) {
146:                            method.instructions.get(j).accept(mv);
147:
148:                            StringBuffer s = new StringBuffer();
149:                            Frame f = frames[j];
150:                            if (f == null) {
151:                                s.append('?');
152:                            } else {
153:                                for (int k = 0; k < f.getLocals(); ++k) {
154:                                    s.append(
155:                                            getShortName(f.getLocal(k)
156:                                                    .toString())).append(' ');
157:                                }
158:                                s.append(" : ");
159:                                for (int k = 0; k < f.getStackSize(); ++k) {
160:                                    s.append(
161:                                            getShortName(f.getStack(k)
162:                                                    .toString())).append(' ');
163:                                }
164:                            }
165:                            while (s.length() < method.maxStack
166:                                    + method.maxLocals + 1) {
167:                                s.append(' ');
168:                            }
169:                            pw.print(Integer.toString(j + 100000).substring(1));
170:                            pw.print(" " + s + " : " + mv.buf); // mv.text.get(j));
171:                        }
172:                        for (int j = 0; j < method.tryCatchBlocks.size(); ++j) {
173:                            ((TryCatchBlockNode) method.tryCatchBlocks.get(j))
174:                                    .accept(mv);
175:                            pw.print(" " + mv.buf);
176:                        }
177:                        pw.println();
178:                    }
179:                }
180:            }
181:
182:            private static String getShortName(final String name) {
183:                int n = name.lastIndexOf('/');
184:                int k = name.length();
185:                if (name.charAt(k - 1) == ';') {
186:                    k--;
187:                }
188:                return n == -1 ? name : name.substring(n + 1, k);
189:            }
190:
191:            /**
192:             * Constructs a new {@link CheckClassAdapter}.
193:             *
194:             * @param cv the class visitor to which this adapter must delegate calls.
195:             */
196:            public CheckClassAdapter(final ClassVisitor cv) {
197:                super (cv);
198:            }
199:
200:            // ------------------------------------------------------------------------
201:            // Implementation of the ClassVisitor interface
202:            // ------------------------------------------------------------------------
203:
204:            public void visit(final int version, final int access,
205:                    final String name, final String signature,
206:                    final String super Name, final String[] interfaces) {
207:                if (start) {
208:                    throw new IllegalStateException(
209:                            "visit must be called only once");
210:                } else {
211:                    start = true;
212:                }
213:                checkState();
214:                checkAccess(access, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL
215:                        + Opcodes.ACC_SUPER + Opcodes.ACC_INTERFACE
216:                        + Opcodes.ACC_ABSTRACT + Opcodes.ACC_SYNTHETIC
217:                        + Opcodes.ACC_ANNOTATION + Opcodes.ACC_ENUM
218:                        + Opcodes.ACC_DEPRECATED);
219:                if (!name.endsWith("package-info")) {
220:                    CheckMethodAdapter.checkInternalName(name, "class name");
221:                }
222:                if ("java/lang/Object".equals(name)) {
223:                    if (super Name != null) {
224:                        throw new IllegalArgumentException(
225:                                "The super class name of the Object class must be 'null'");
226:                    }
227:                } else {
228:                    CheckMethodAdapter.checkInternalName(super Name,
229:                            "super class name");
230:                }
231:                if (signature != null) {
232:                    // TODO
233:                }
234:                if ((access & Opcodes.ACC_INTERFACE) != 0) {
235:                    if (!"java/lang/Object".equals(super Name)) {
236:                        throw new IllegalArgumentException(
237:                                "The super class name of interfaces must be 'java/lang/Object'");
238:                    }
239:                }
240:                if (interfaces != null) {
241:                    for (int i = 0; i < interfaces.length; ++i) {
242:                        CheckMethodAdapter.checkInternalName(interfaces[i],
243:                                "interface name at index " + i);
244:                    }
245:                }
246:                cv.visit(version, access, name, signature, super Name,
247:                        interfaces);
248:            }
249:
250:            public void visitSource(final String file, final String debug) {
251:                checkState();
252:                if (source) {
253:                    throw new IllegalStateException(
254:                            "visitSource can be called only once.");
255:                }
256:                source = true;
257:                cv.visitSource(file, debug);
258:            }
259:
260:            public void visitOuterClass(final String owner, final String name,
261:                    final String desc) {
262:                checkState();
263:                if (outer) {
264:                    throw new IllegalStateException(
265:                            "visitOuterClass can be called only once.");
266:                }
267:                outer = true;
268:                if (owner == null) {
269:                    throw new IllegalArgumentException(
270:                            "Illegal outer class owner");
271:                }
272:                if (desc != null) {
273:                    CheckMethodAdapter.checkMethodDesc(desc);
274:                }
275:                cv.visitOuterClass(owner, name, desc);
276:            }
277:
278:            public void visitInnerClass(final String name,
279:                    final String outerName, final String innerName,
280:                    final int access) {
281:                checkState();
282:                CheckMethodAdapter.checkInternalName(name, "class name");
283:                if (outerName != null) {
284:                    CheckMethodAdapter.checkInternalName(outerName,
285:                            "outer class name");
286:                }
287:                if (innerName != null) {
288:                    CheckMethodAdapter.checkIdentifier(innerName,
289:                            "inner class name");
290:                }
291:                checkAccess(access, Opcodes.ACC_PUBLIC + Opcodes.ACC_PRIVATE
292:                        + Opcodes.ACC_PROTECTED + Opcodes.ACC_STATIC
293:                        + Opcodes.ACC_FINAL + Opcodes.ACC_INTERFACE
294:                        + Opcodes.ACC_ABSTRACT + Opcodes.ACC_SYNTHETIC
295:                        + Opcodes.ACC_ANNOTATION + Opcodes.ACC_ENUM);
296:                cv.visitInnerClass(name, outerName, innerName, access);
297:            }
298:
299:            public FieldVisitor visitField(final int access, final String name,
300:                    final String desc, final String signature,
301:                    final Object value) {
302:                checkState();
303:                checkAccess(access, Opcodes.ACC_PUBLIC + Opcodes.ACC_PRIVATE
304:                        + Opcodes.ACC_PROTECTED + Opcodes.ACC_STATIC
305:                        + Opcodes.ACC_FINAL + Opcodes.ACC_VOLATILE
306:                        + Opcodes.ACC_TRANSIENT + Opcodes.ACC_SYNTHETIC
307:                        + Opcodes.ACC_ENUM + Opcodes.ACC_DEPRECATED);
308:                CheckMethodAdapter.checkIdentifier(name, "field name");
309:                CheckMethodAdapter.checkDesc(desc, false);
310:                if (signature != null) {
311:                    // TODO
312:                }
313:                if (value != null) {
314:                    CheckMethodAdapter.checkConstant(value);
315:                }
316:                FieldVisitor av = cv.visitField(access, name, desc, signature,
317:                        value);
318:                return new CheckFieldAdapter(av);
319:            }
320:
321:            public MethodVisitor visitMethod(final int access,
322:                    final String name, final String desc,
323:                    final String signature, final String[] exceptions) {
324:                checkState();
325:                checkAccess(access, Opcodes.ACC_PUBLIC + Opcodes.ACC_PRIVATE
326:                        + Opcodes.ACC_PROTECTED + Opcodes.ACC_STATIC
327:                        + Opcodes.ACC_FINAL + Opcodes.ACC_SYNCHRONIZED
328:                        + Opcodes.ACC_BRIDGE + Opcodes.ACC_VARARGS
329:                        + Opcodes.ACC_NATIVE + Opcodes.ACC_ABSTRACT
330:                        + Opcodes.ACC_STRICT + Opcodes.ACC_SYNTHETIC
331:                        + Opcodes.ACC_DEPRECATED);
332:                CheckMethodAdapter.checkMethodIdentifier(name, "method name");
333:                CheckMethodAdapter.checkMethodDesc(desc);
334:                if (signature != null) {
335:                    // TODO
336:                }
337:                if (exceptions != null) {
338:                    for (int i = 0; i < exceptions.length; ++i) {
339:                        CheckMethodAdapter.checkInternalName(exceptions[i],
340:                                "exception name at index " + i);
341:                    }
342:                }
343:                return new CheckMethodAdapter(cv.visitMethod(access, name,
344:                        desc, signature, exceptions));
345:            }
346:
347:            public AnnotationVisitor visitAnnotation(final String desc,
348:                    final boolean visible) {
349:                checkState();
350:                CheckMethodAdapter.checkDesc(desc, false);
351:                return new CheckAnnotationAdapter(cv.visitAnnotation(desc,
352:                        visible));
353:            }
354:
355:            public void visitAttribute(final Attribute attr) {
356:                checkState();
357:                if (attr == null) {
358:                    throw new IllegalArgumentException(
359:                            "Invalid attribute (must not be null)");
360:                }
361:                cv.visitAttribute(attr);
362:            }
363:
364:            public void visitEnd() {
365:                checkState();
366:                end = true;
367:                cv.visitEnd();
368:            }
369:
370:            // ------------------------------------------------------------------------
371:            // Utility methods
372:            // ------------------------------------------------------------------------
373:
374:            /**
375:             * Checks that the visit method has been called and that visitEnd has not
376:             * been called.
377:             */
378:            private void checkState() {
379:                if (!start) {
380:                    throw new IllegalStateException(
381:                            "Cannot visit member before visit has been called.");
382:                }
383:                if (end) {
384:                    throw new IllegalStateException(
385:                            "Cannot visit member after visitEnd has been called.");
386:                }
387:            }
388:
389:            /**
390:             * Checks that the given access flags do not contain invalid flags. This
391:             * method also checks that mutually incompatible flags are not set
392:             * simultaneously.
393:             *
394:             * @param access the access flags to be checked
395:             * @param possibleAccess the valid access flags.
396:             */
397:            static void checkAccess(final int access, final int possibleAccess) {
398:                if ((access & ~possibleAccess) != 0) {
399:                    throw new IllegalArgumentException("Invalid access flags: "
400:                            + access);
401:                }
402:                int pub = (access & Opcodes.ACC_PUBLIC) != 0 ? 1 : 0;
403:                int pri = (access & Opcodes.ACC_PRIVATE) != 0 ? 1 : 0;
404:                int pro = (access & Opcodes.ACC_PROTECTED) != 0 ? 1 : 0;
405:                if (pub + pri + pro > 1) {
406:                    throw new IllegalArgumentException(
407:                            "public private and protected are mutually exclusive: "
408:                                    + access);
409:                }
410:                int fin = (access & Opcodes.ACC_FINAL) != 0 ? 1 : 0;
411:                int abs = (access & Opcodes.ACC_ABSTRACT) != 0 ? 1 : 0;
412:                if (fin + abs > 1) {
413:                    throw new IllegalArgumentException(
414:                            "final and abstract are mutually exclusive: "
415:                                    + access);
416:                }
417:            }
418:        }
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