Source Code Cross Referenced for RuntimeCheckVisitor.java in  » Aspect-oriented » aspectwerkz-2.0 » org » codehaus » aspectwerkz » transform » inlining » compiler » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Aspect oriented » aspectwerkz 2.0 » org.codehaus.aspectwerkz.transform.inlining.compiler 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**************************************************************************************
002:         * Copyright (c) Jonas Bon?r, Alexandre Vasseur. All rights reserved.                 *
003:         * http://aspectwerkz.codehaus.org                                                    *
004:         * ---------------------------------------------------------------------------------- *
005:         * The software in this package is published under the terms of the LGPL license      *
006:         * a copy of which has been included with this distribution in the license.txt file.  *
007:         **************************************************************************************/package org.codehaus.aspectwerkz.transform.inlining.compiler;
008:
009:        import org.codehaus.aspectwerkz.expression.ExpressionVisitor;
010:        import org.codehaus.aspectwerkz.expression.Undeterministic;
011:        import org.codehaus.aspectwerkz.expression.ExpressionContext;
012:        import org.codehaus.aspectwerkz.expression.ExpressionNamespace;
013:        import org.codehaus.aspectwerkz.expression.ExpressionInfo;
014:        import org.codehaus.aspectwerkz.expression.ast.ASTOr;
015:        import org.codehaus.aspectwerkz.expression.ast.ASTAnd;
016:        import org.codehaus.aspectwerkz.expression.ast.ASTNot;
017:        import org.codehaus.aspectwerkz.expression.ast.ASTTarget;
018:        import org.codehaus.aspectwerkz.expression.ast.ASTPointcutReference;
019:        import org.codehaus.aspectwerkz.expression.ast.ASTExecution;
020:        import org.codehaus.aspectwerkz.expression.ast.ASTCall;
021:        import org.codehaus.aspectwerkz.expression.ast.ASTSet;
022:        import org.codehaus.aspectwerkz.expression.ast.ASTGet;
023:        import org.codehaus.aspectwerkz.expression.ast.ASTHandler;
024:        import org.codehaus.aspectwerkz.expression.ast.ASTStaticInitialization;
025:        import org.codehaus.aspectwerkz.expression.ast.ASTWithin;
026:        import org.codehaus.aspectwerkz.expression.ast.ASTWithinCode;
027:        import org.codehaus.aspectwerkz.expression.ast.ASTHasMethod;
028:        import org.codehaus.aspectwerkz.expression.ast.ASTHasField;
029:        import org.codehaus.aspectwerkz.expression.ast.ASTThis;
030:        import org.codehaus.aspectwerkz.expression.ast.ASTCflow;
031:        import org.codehaus.aspectwerkz.expression.ast.ASTCflowBelow;
032:        import org.codehaus.aspectwerkz.expression.ast.ASTArgs;
033:        import org.codehaus.aspectwerkz.transform.inlining.compiler.AbstractJoinPointCompiler;
034:        import org.codehaus.aspectwerkz.transform.inlining.AsmHelper;
035:        import org.codehaus.aspectwerkz.transform.TransformationConstants;
036:        import org.codehaus.aspectwerkz.cflow.CflowCompiler;
037:        import org.objectweb.asm.CodeVisitor;
038:        import org.objectweb.asm.Constants;
039:
040:        /**
041:         * Visit an expression and push on the bytecode stack the boolean expression that corresponds to the residual
042:         * part for the target(CALLEE) filtering and cflow / cflowbelow runtime checks
043:         * <p/>
044:         * TODO: for now OR / AND / NOT are turned in IAND etc, ie "&" and not "&&" that is more efficient but is using labels.
045:         * <p/>
046:         * Note: we have to override here (and maintain) every visit Method that visit a node that appears in an expression
047:         * (f.e. set , get, etc, but not ASTParameter), since we cannot rely on AND/OR/NOT nodes to push the boolean expressions.
048:         *
049:         * @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur</a>
050:         */
051:        public class RuntimeCheckVisitor extends ExpressionVisitor implements 
052:                Constants {
053:
054:            private AbstractJoinPointCompiler m_compiler;
055:
056:            private CodeVisitor cv;
057:
058:            private ExpressionInfo m_expressionInfo;
059:
060:            private boolean m_isOptimizedJoinPoint;
061:
062:            private int m_joinPointIndex;
063:
064:            private int m_calleeIndex;
065:
066:            /**
067:             * Create a new visitor given a specific AdviceInfo
068:             *
069:             * @param compiler             we are working for
070:             * @param cv                   of the method block we are compiling
071:             * @param info                 expression info
072:             * @param isOptimizedJoinPoint
073:             * @param joinPointIndex
074:             */
075:            public RuntimeCheckVisitor(
076:                    final AbstractJoinPointCompiler compiler,
077:                    final CodeVisitor cv, final ExpressionInfo info,
078:                    final boolean isOptimizedJoinPoint,
079:                    final int joinPointIndex, final int calleeIndex) {
080:                super (info, info.toString(), info.getNamespace(), info
081:                        .getExpression().getASTRoot());
082:                m_compiler = compiler;
083:                m_expressionInfo = info;
084:                m_isOptimizedJoinPoint = isOptimizedJoinPoint;
085:                m_joinPointIndex = joinPointIndex;
086:                m_calleeIndex = calleeIndex;
087:                this .cv = cv;
088:            }
089:
090:            /**
091:             * Push the boolean typed expression on the stack.
092:             *
093:             * @param context
094:             */
095:            public void pushCheckOnStack(ExpressionContext context) {
096:                super .match(context);
097:            }
098:
099:            /**
100:             * Handles OR expression
101:             *
102:             * @param node
103:             * @param data
104:             * @return
105:             */
106:            public Object visit(ASTOr node, Object data) {
107:                Boolean matchL = (Boolean) node.jjtGetChild(0).jjtAccept(this ,
108:                        data);
109:                Boolean matchR = (Boolean) node.jjtGetChild(1).jjtAccept(this ,
110:                        data);
111:                Boolean intermediate = Undeterministic.or(matchL, matchR);
112:                cv.visitInsn(IOR);
113:                for (int i = 2; i < node.jjtGetNumChildren(); i++) {
114:                    Boolean matchNext = (Boolean) node.jjtGetChild(i)
115:                            .jjtAccept(this , data);
116:                    intermediate = Undeterministic.or(intermediate, matchNext);
117:                    cv.visitInsn(IOR);
118:                }
119:                return intermediate;
120:            }
121:
122:            public Object visit(ASTAnd node, Object data) {
123:                Boolean matchL = (Boolean) node.jjtGetChild(0).jjtAccept(this ,
124:                        data);
125:                Boolean matchR = (Boolean) node.jjtGetChild(1).jjtAccept(this ,
126:                        data);
127:                Boolean intermediate = Undeterministic.and(matchL, matchR);
128:                cv.visitInsn(IAND);
129:                for (int i = 2; i < node.jjtGetNumChildren(); i++) {
130:                    Boolean matchNext = (Boolean) node.jjtGetChild(i)
131:                            .jjtAccept(this , data);
132:                    intermediate = Undeterministic.and(intermediate, matchNext);
133:                    cv.visitInsn(IAND);
134:                }
135:                return intermediate;
136:            }
137:
138:            public Object visit(ASTNot node, Object data) {
139:                Boolean match = (Boolean) node.jjtGetChild(0).jjtAccept(this ,
140:                        data);
141:                cv.visitInsn(INEG);
142:                return Undeterministic.not(match);
143:            }
144:
145:            public Object visit(ASTTarget node, Object data) {
146:                Boolean match = (Boolean) super .visit(node, data);
147:                if (match != null) {
148:                    push(match);
149:                } else {
150:                    // runtime check
151:                    String boundedTypeDesc = AsmHelper
152:                            .convertReflectDescToTypeDesc(node
153:                                    .getBoundedType(m_expressionInfo));
154:                    m_compiler.loadCallee(cv, m_isOptimizedJoinPoint,
155:                            m_joinPointIndex, m_calleeIndex);
156:                    cv.visitTypeInsn(INSTANCEOF, boundedTypeDesc.substring(1,
157:                            boundedTypeDesc.length() - 1));
158:                }
159:                return match;
160:            }
161:
162:            public Object visit(ASTThis node, Object data) {
163:                Boolean match = (Boolean) super .visit(node, data);
164:                push(match);
165:                return match;
166:            }
167:
168:            public Object visit(ASTCflow node, Object data) {
169:                // runtime check
170:                String cflowClassName = CflowCompiler
171:                        .getCflowAspectClassName(node.hashCode());
172:                cv.visitMethodInsn(INVOKESTATIC, cflowClassName,
173:                        TransformationConstants.IS_IN_CFLOW_METOD_NAME,
174:                        TransformationConstants.IS_IN_CFLOW_METOD_SIGNATURE);
175:                return (Boolean) super .visit(node, data);
176:            }
177:
178:            public Object visit(ASTCflowBelow node, Object data) {
179:                // runtime check
180:                //TODO: cflowbelow ID will differ from cflow one.. => not optimized
181:                String cflowClassName = CflowCompiler
182:                        .getCflowAspectClassName(node.hashCode());
183:                cv.visitMethodInsn(INVOKESTATIC, cflowClassName,
184:                        TransformationConstants.IS_IN_CFLOW_METOD_NAME,
185:                        TransformationConstants.IS_IN_CFLOW_METOD_SIGNATURE);
186:                return (Boolean) super .visit(node, data);
187:            }
188:
189:            public Object visit(ASTArgs node, Object data) {
190:                Boolean match = (Boolean) super .visit(node, data);
191:                push(match);
192:                return match;
193:            }
194:
195:            public Object visit(ASTPointcutReference node, Object data) {
196:                ExpressionContext context = (ExpressionContext) data;
197:                ExpressionNamespace namespace = ExpressionNamespace
198:                        .getNamespace(m_namespace);
199:                ExpressionVisitor expression = namespace.getExpression(node
200:                        .getName());
201:
202:                // build a new RuntimeCheckVisitor to visit the sub expression
203:                RuntimeCheckVisitor referenced = new RuntimeCheckVisitor(
204:                        m_compiler, cv, expression.getExpressionInfo(),
205:                        m_isOptimizedJoinPoint, m_joinPointIndex, m_calleeIndex);
206:                return referenced.matchUndeterministic(context);
207:            }
208:
209:            public Object visit(ASTExecution node, Object data) {
210:                Boolean match = (Boolean) super .visit(node, data);
211:                push(match);
212:                return match;
213:            }
214:
215:            public Object visit(ASTCall node, Object data) {
216:                Boolean match = (Boolean) super .visit(node, data);
217:                push(match);
218:                return match;
219:            }
220:
221:            public Object visit(ASTSet node, Object data) {
222:                Boolean match = (Boolean) super .visit(node, data);
223:                push(match);
224:                return match;
225:            }
226:
227:            public Object visit(ASTGet node, Object data) {
228:                Boolean match = (Boolean) super .visit(node, data);
229:                push(match);
230:                return match;
231:            }
232:
233:            public Object visit(ASTHandler node, Object data) {
234:                Boolean match = (Boolean) super .visit(node, data);
235:                push(match);
236:                return match;
237:            }
238:
239:            public Object visit(ASTStaticInitialization node, Object data) {
240:                Boolean match = (Boolean) super .visit(node, data);
241:                push(match);
242:                return match;
243:            }
244:
245:            public Object visit(ASTWithin node, Object data) {
246:                Boolean match = (Boolean) super .visit(node, data);
247:                push(match);
248:                return match;
249:            }
250:
251:            public Object visit(ASTWithinCode node, Object data) {
252:                Boolean match = (Boolean) super .visit(node, data);
253:                push(match);
254:                return match;
255:            }
256:
257:            public Object visit(ASTHasMethod node, Object data) {
258:                Boolean match = (Boolean) super .visit(node, data);
259:                push(match);
260:                return match;
261:            }
262:
263:            public Object visit(ASTHasField node, Object data) {
264:                Boolean match = (Boolean) super .visit(node, data);
265:                push(match);
266:                return match;
267:            }
268:
269:            private void push(Boolean b) {
270:                if (b == null) {
271:                    throw new Error(
272:                            "attempt to push an undetermined match result");
273:                } else if (b.booleanValue()) {
274:                    cv.visitInsn(ICONST_1);
275:                } else {
276:                    cv.visitInsn(ICONST_M1);
277:                }
278:            }
279:        }
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