Source Code Cross Referenced for Invoke.java in  » Code-Analyzer » findbugs » edu » umd » cs » findbugs » ba » bcp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Code Analyzer » findbugs » edu.umd.cs.findbugs.ba.bcp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Bytecode Analysis Framework
003:         * Copyright (C) 2003,2004 University of Maryland
004:         * 
005:         * This library is free software; you can redistribute it and/or
006:         * modify it under the terms of the GNU Lesser General Public
007:         * License as published by the Free Software Foundation; either
008:         * version 2.1 of the License, or (at your option) any later version.
009:         * 
010:         * This library is distributed in the hope that it will be useful,
011:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         * Lesser General Public License for more details.
014:         * 
015:         * You should have received a copy of the GNU Lesser General Public
016:         * License along with this library; if not, write to the Free Software
017:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018:         */
019:
020:        package edu.umd.cs.findbugs.ba.bcp;
021:
022:        import java.util.regex.Pattern;
023:
024:        import org.apache.bcel.Constants;
025:        import org.apache.bcel.generic.ConstantPoolGen;
026:        import org.apache.bcel.generic.Instruction;
027:        import org.apache.bcel.generic.InstructionHandle;
028:        import org.apache.bcel.generic.InvokeInstruction;
029:
030:        import edu.umd.cs.findbugs.annotations.Nullable;
031:        import edu.umd.cs.findbugs.ba.AnalysisContext;
032:        import edu.umd.cs.findbugs.ba.DataflowAnalysisException;
033:        import edu.umd.cs.findbugs.ba.Edge;
034:        import edu.umd.cs.findbugs.ba.Hierarchy;
035:        import edu.umd.cs.findbugs.ba.RepositoryLookupFailureCallback;
036:        import edu.umd.cs.findbugs.ba.vna.ValueNumberFrame;
037:
038:        /**
039:         * A PatternElement to match a method invocation.
040:         * Currently, we don't allow variables in this element (for arguments
041:         * and return value).  This would be a good thing to add.
042:         * We also don't distinguish between invokevirtual, invokeinterface,
043:         * and invokespecial.
044:         * <p/>
045:         * <p> Invoke objects match by class name, method name, method signature,
046:         * and <em>mode</em>.
047:         * <p/>
048:         * <p> Names and signatures may be matched in several ways:
049:         * <ol>
050:         * <li> By an exact match. This is the default behavior.
051:         * <li> By a regular expression. If the string provided to the Invoke
052:         * constructor begins with a "/" character, the rest of the string
053:         * is treated as a regular expression.
054:         * <li> As a subclass match. This only applies to class name matches.
055:         * If the first character of a class name string is "+", then the
056:         * rest of the string is treated as the name of a base class.
057:         * Any subclass or subinterface of the named type will be accepted.
058:         * </ol>
059:         * <p/>
060:         * <p> The <em>mode</em> specifies what kind of invocations in the Invoke
061:         * element matches. It is specified as the bitwise combination of the
062:         * following values:
063:         * <ol>
064:         * <li> <code>INSTANCE</code>, which matches ordinary instance method invocations
065:         * <li> <code>STATIC</code>, which matches static method invocations
066:         * <li> <code>CONSTRUCTOR</code>, which matches object constructor invocations
067:         * </ol>
068:         * The special mode <code>ORDINARY_METHOD</code> is equivalent to <code>INSTANCE|STATIC</code>.
069:         * The special mode <code>ANY</code> is equivalent to <code>INSTANCE|STATIC|CONSTRUCTOR</code>.
070:         *
071:         * @author David Hovemeyer
072:         * @see PatternElement
073:         */
074:        public class Invoke extends PatternElement {
075:
076:            /**
077:             * Match ordinary (non-constructor) instance invocations.
078:             */
079:            public static final int INSTANCE = 1;
080:
081:            /**
082:             * Match static invocations.
083:             */
084:            public static final int STATIC = 2;
085:
086:            /**
087:             * Match object constructor invocations.
088:             */
089:            public static final int CONSTRUCTOR = 4;
090:
091:            /**
092:             * Match ordinary methods (everything except constructors).
093:             */
094:            public static final int ORDINARY_METHOD = INSTANCE | STATIC;
095:
096:            /**
097:             * Match both static and instance invocations.
098:             */
099:            public static final int ANY = INSTANCE | STATIC | CONSTRUCTOR;
100:
101:            private interface StringMatcher {
102:                public boolean match(String s);
103:            }
104:
105:            private static class ExactStringMatcher implements  StringMatcher {
106:                private String value;
107:
108:                public ExactStringMatcher(String value) {
109:                    this .value = value;
110:                }
111:
112:                public boolean match(String s) {
113:                    return s.equals(value);
114:                }
115:            }
116:
117:            private static class RegexpStringMatcher implements  StringMatcher {
118:                private Pattern pattern;
119:
120:                public RegexpStringMatcher(String re) {
121:                    pattern = Pattern.compile(re);
122:                }
123:
124:                public boolean match(String s) {
125:                    return pattern.matcher(s).matches();
126:                }
127:            }
128:
129:            private static class SubclassMatcher implements  StringMatcher {
130:                private String className;
131:
132:                public SubclassMatcher(String className) {
133:                    this .className = className;
134:                }
135:
136:                public boolean match(String s) {
137:                    try {
138:                        return Hierarchy.isSubtype(s, className);
139:                    } catch (ClassNotFoundException e) {
140:                        AnalysisContext.reportMissingClass(e);
141:                        return false;
142:                    }
143:                }
144:            }
145:
146:            private final StringMatcher classNameMatcher;
147:            private final StringMatcher methodNameMatcher;
148:            private final StringMatcher methodSigMatcher;
149:            private final int mode;
150:
151:            /**
152:             * Constructor.
153:             *
154:             * @param className  the class name of the method; may be specified exactly,
155:             *                   as a regexp, or as a subtype match
156:             * @param methodName the name of the method; may be specified exactly or as a regexp
157:             * @param methodSig  the signature of the method; may be specified exactly or as a regexp
158:             * @param mode       the mode of invocation
159:             */
160:            public Invoke(String className, String methodName,
161:                    String methodSig, int mode, @Nullable
162:                    RepositoryLookupFailureCallback lookupFailureCallback) {
163:                this .classNameMatcher = createClassMatcher(className);
164:                this .methodNameMatcher = createMatcher(methodName);
165:                this .methodSigMatcher = createMatcher(methodSig);
166:                this .mode = mode;
167:            }
168:
169:            private StringMatcher createClassMatcher(String s) {
170:                return s.startsWith("+") ? new SubclassMatcher(s.substring(1))
171:                        : createMatcher(s);
172:            }
173:
174:            private StringMatcher createMatcher(String s) {
175:                return s.startsWith("/") ? (StringMatcher) new RegexpStringMatcher(
176:                        s.substring(1))
177:                        : (StringMatcher) new ExactStringMatcher(s);
178:            }
179:
180:            @Override
181:            public MatchResult match(InstructionHandle handle,
182:                    ConstantPoolGen cpg, ValueNumberFrame before,
183:                    ValueNumberFrame after, BindingSet bindingSet)
184:                    throws DataflowAnalysisException {
185:
186:                // See if the instruction is an InvokeInstruction
187:                Instruction ins = handle.getInstruction();
188:                if (!(ins instanceof  InvokeInstruction))
189:                    return null;
190:                InvokeInstruction inv = (InvokeInstruction) ins;
191:
192:                String methodName = inv.getMethodName(cpg);
193:                boolean isStatic = inv.getOpcode() == Constants.INVOKESTATIC;
194:                boolean isCtor = methodName.equals("<init>");
195:
196:                int actualMode = 0;
197:
198:                if (isStatic)
199:                    actualMode |= STATIC;
200:                if (isCtor)
201:                    actualMode |= CONSTRUCTOR;
202:                if (!isStatic && !isCtor)
203:                    actualMode |= INSTANCE;
204:
205:                // Intersection of actual and desired modes must be nonempty.
206:                if ((actualMode & mode) == 0)
207:                    return null;
208:
209:                // Check class name, method name, and method signature.
210:                if (!methodNameMatcher.match(methodName)
211:                        || !methodSigMatcher.match(inv.getSignature(cpg))
212:                        || !classNameMatcher.match(inv.getClassName(cpg)))
213:                    return null;
214:
215:                // It's a match!
216:                return new MatchResult(this , bindingSet);
217:
218:            }
219:
220:            @Override
221:            public boolean acceptBranch(Edge edge, InstructionHandle source) {
222:                return true;
223:            }
224:
225:            @Override
226:            public int minOccur() {
227:                return 1;
228:            }
229:
230:            @Override
231:            public int maxOccur() {
232:                return 1;
233:            }
234:        }
235:
236:        // vim:ts=4
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