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Java Source Code / Java Documentation » Net » Terracotta » com.tc.aspectwerkz.transform.inlining.compiler 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice.  All rights reserved.
003:         */
004:        package com.tc.aspectwerkz.transform.inlining.compiler;
005:
006:        import com.tc.asm.MethodVisitor;
007:        import com.tc.asm.Opcodes;
008:
009:        import com.tc.aspectwerkz.aspect.AdviceInfo;
010:        import com.tc.aspectwerkz.aspect.container.AspectFactoryManager;
011:        import com.tc.aspectwerkz.cflow.CflowCompiler;
012:        import com.tc.aspectwerkz.expression.ast.ASTAnd;
013:        import com.tc.aspectwerkz.expression.ast.ASTArgs;
014:        import com.tc.aspectwerkz.expression.ast.ASTCall;
015:        import com.tc.aspectwerkz.expression.ast.ASTCflow;
016:        import com.tc.aspectwerkz.expression.ast.ASTCflowBelow;
017:        import com.tc.aspectwerkz.expression.ast.ASTExecution;
018:        import com.tc.aspectwerkz.expression.ast.ASTGet;
019:        import com.tc.aspectwerkz.expression.ast.ASTHandler;
020:        import com.tc.aspectwerkz.expression.ast.ASTHasField;
021:        import com.tc.aspectwerkz.expression.ast.ASTHasMethod;
022:        import com.tc.aspectwerkz.expression.ast.ASTNot;
023:        import com.tc.aspectwerkz.expression.ast.ASTOr;
024:        import com.tc.aspectwerkz.expression.ast.ASTPointcutReference;
025:        import com.tc.aspectwerkz.expression.ast.ASTSet;
026:        import com.tc.aspectwerkz.expression.ast.ASTStaticInitialization;
027:        import com.tc.aspectwerkz.expression.ast.ASTTarget;
028:        import com.tc.aspectwerkz.expression.ast.ASTThis;
029:        import com.tc.aspectwerkz.expression.ast.ASTWithin;
030:        import com.tc.aspectwerkz.expression.ast.ASTWithinCode;
031:        import com.tc.aspectwerkz.expression.ExpressionVisitor;
032:        import com.tc.aspectwerkz.expression.ExpressionInfo;
033:        import com.tc.aspectwerkz.expression.Undeterministic;
034:        import com.tc.aspectwerkz.expression.ExpressionNamespace;
035:        import com.tc.aspectwerkz.expression.ExpressionContext;
036:        import com.tc.aspectwerkz.transform.TransformationConstants;
037:        import com.tc.aspectwerkz.transform.inlining.AsmHelper;
038:        import com.tc.aspectwerkz.transform.inlining.compiler.AbstractJoinPointCompiler;
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 , getDefault, 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:                Opcodes {
053:            public static final int NULL_PER_OBJECT_TYPE = -1;
054:            public static final int PER_THIS_TYPE = 1;
055:            public static final int PER_TARGET_TYPE = 2;
056:
057:            private MethodVisitor cv;
058:
059:            private CompilerInput m_input;
060:
061:            private int m_perObjectCheckType = NULL_PER_OBJECT_TYPE;
062:
063:            private String m_aspectQName;
064:
065:            /**
066:             * Create a new visitor given a specific AdviceInfo
067:             *
068:             * @param cv            of the method block we are compiling
069:             * @param info          expression info
070:             * @param input
071:             * @param perObjectType
072:             * @param aspectQName
073:             */
074:            public RuntimeCheckVisitor(final MethodVisitor cv,
075:                    final ExpressionInfo info, final CompilerInput input,
076:                    final int perObjectType, final String aspectQName) {
077:                super (info, info.toString(), info.getNamespace(), info
078:                        .getExpression().getASTRoot());
079:                m_input = input;
080:                m_perObjectCheckType = perObjectType;
081:                m_aspectQName = aspectQName;
082:
083:                this .cv = cv;
084:            }
085:
086:            /**
087:             * Push the boolean typed expression on the stack.
088:             *
089:             * @param adviceInfo
090:             */
091:            public void pushCheckOnStack(AdviceInfo adviceInfo) {
092:                super .match(adviceInfo.getExpressionContext());
093:
094:                switch (m_perObjectCheckType) {
095:                case PER_THIS_TYPE: {
096:                    AbstractJoinPointCompiler.loadCaller(cv, m_input);
097:                    cv
098:                            .visitMethodInsn(
099:                                    INVOKESTATIC,
100:                                    AspectFactoryManager
101:                                            .getAspectFactoryClassName(
102:                                                    adviceInfo
103:                                                            .getAspectClassName(),
104:                                                    adviceInfo
105:                                                            .getAspectQualifiedName()),
106:                                    TransformationConstants.FACTORY_HASASPECT_METHOD_NAME,
107:                                    TransformationConstants.FACTORY_HASASPECT_PEROBJECT_METHOD_SIGNATURE);
108:                    cv.visitInsn(IAND);
109:
110:                    break;
111:                }
112:
113:                case PER_TARGET_TYPE: {
114:                    AbstractJoinPointCompiler.loadCallee(cv, m_input);
115:                    cv
116:                            .visitMethodInsn(
117:                                    INVOKESTATIC,
118:                                    AspectFactoryManager
119:                                            .getAspectFactoryClassName(
120:                                                    adviceInfo
121:                                                            .getAspectClassName(),
122:                                                    adviceInfo
123:                                                            .getAspectQualifiedName()),
124:                                    TransformationConstants.FACTORY_HASASPECT_METHOD_NAME,
125:                                    TransformationConstants.FACTORY_HASASPECT_PEROBJECT_METHOD_SIGNATURE);
126:                    cv.visitInsn(IAND);
127:
128:                    break;
129:                }
130:                }
131:            }
132:
133:            /**
134:             * Handles OR expression
135:             *
136:             * @param node
137:             * @param data
138:             * @return
139:             */
140:            public Object visit(ASTOr node, Object data) {
141:                Boolean matchL = (Boolean) node.jjtGetChild(0).jjtAccept(this ,
142:                        data);
143:                Boolean matchR = (Boolean) node.jjtGetChild(1).jjtAccept(this ,
144:                        data);
145:                Boolean intermediate = Undeterministic.or(matchL, matchR);
146:                cv.visitInsn(IOR);
147:                for (int i = 2; i < node.jjtGetNumChildren(); i++) {
148:                    Boolean matchNext = (Boolean) node.jjtGetChild(i)
149:                            .jjtAccept(this , data);
150:                    intermediate = Undeterministic.or(intermediate, matchNext);
151:                    cv.visitInsn(IOR);
152:                }
153:                return intermediate;
154:            }
155:
156:            public Object visit(ASTAnd node, Object data) {
157:                Boolean matchL = (Boolean) node.jjtGetChild(0).jjtAccept(this ,
158:                        data);
159:                Boolean matchR = (Boolean) node.jjtGetChild(1).jjtAccept(this ,
160:                        data);
161:                Boolean intermediate = Undeterministic.and(matchL, matchR);
162:                cv.visitInsn(IAND);
163:                for (int i = 2; i < node.jjtGetNumChildren(); i++) {
164:                    Boolean matchNext = (Boolean) node.jjtGetChild(i)
165:                            .jjtAccept(this , data);
166:                    intermediate = Undeterministic.and(intermediate, matchNext);
167:                    cv.visitInsn(IAND);
168:                }
169:                return intermediate;
170:            }
171:
172:            public Object visit(ASTNot node, Object data) {
173:                Boolean match = (Boolean) node.jjtGetChild(0).jjtAccept(this ,
174:                        data);
175:                cv.visitInsn(INEG);
176:                return Undeterministic.not(match);
177:            }
178:
179:            public Object visit(ASTTarget node, Object data) {
180:                Boolean match = (Boolean) super .visit(node, data);
181:                if (match != null) {
182:                    push(match);
183:                } else {
184:                    // runtime check
185:                    String boundedTypeDesc = AsmHelper
186:                            .convertReflectDescToTypeDesc(node
187:                                    .getBoundedType(m_expressionInfo));
188:                    AbstractJoinPointCompiler.loadCallee(cv, m_input);
189:                    cv.visitTypeInsn(INSTANCEOF, boundedTypeDesc.substring(1,
190:                            boundedTypeDesc.length() - 1));
191:                }
192:                return match;
193:            }
194:
195:            public Object visit(ASTThis node, Object data) {
196:                Boolean match = (Boolean) super .visit(node, data);
197:                push(match);
198:                return match;
199:            }
200:
201:            public Object visit(ASTCflow node, Object data) {
202:                // runtime check
203:                String cflowClassName = CflowCompiler
204:                        .getCflowAspectClassName(node.hashCode());
205:                cv.visitMethodInsn(INVOKESTATIC, cflowClassName,
206:                        TransformationConstants.IS_IN_CFLOW_METOD_NAME,
207:                        TransformationConstants.IS_IN_CFLOW_METOD_SIGNATURE);
208:                return super .visit(node, data);
209:            }
210:
211:            public Object visit(ASTCflowBelow node, Object data) {
212:                // runtime check
213:                //TODO: cflowbelow ID will differ from cflow one.. => not optimized
214:                String cflowClassName = CflowCompiler
215:                        .getCflowAspectClassName(node.hashCode());
216:                cv.visitMethodInsn(INVOKESTATIC, cflowClassName,
217:                        TransformationConstants.IS_IN_CFLOW_METOD_NAME,
218:                        TransformationConstants.IS_IN_CFLOW_METOD_SIGNATURE);
219:                return super .visit(node, data);
220:            }
221:
222:            public Object visit(ASTArgs node, Object data) {
223:                Boolean match = (Boolean) super .visit(node, data);
224:                push(match);
225:                return match;
226:            }
227:
228:            public Object visit(ASTPointcutReference node, Object data) {
229:                ExpressionContext context = (ExpressionContext) data;
230:                ExpressionNamespace namespace = ExpressionNamespace
231:                        .getNamespace(m_namespace);
232:                ExpressionVisitor expression = namespace.getExpression(node
233:                        .getName());
234:
235:                // build a new RuntimeCheckVisitor to visit the sub expression
236:                RuntimeCheckVisitor referenced = new RuntimeCheckVisitor(cv,
237:                        expression.getExpressionInfo(), m_input,
238:                        m_perObjectCheckType, m_aspectQName);
239:                return referenced.matchUndeterministic(context);
240:            }
241:
242:            public Object visit(ASTExecution node, Object data) {
243:                Boolean match = (Boolean) super .visit(node, data);
244:                push(match);
245:                return match;
246:            }
247:
248:            public Object visit(ASTCall node, Object data) {
249:                Boolean match = (Boolean) super .visit(node, data);
250:                push(match);
251:                return match;
252:            }
253:
254:            public Object visit(ASTSet node, Object data) {
255:                Boolean match = (Boolean) super .visit(node, data);
256:                push(match);
257:                return match;
258:            }
259:
260:            public Object visit(ASTGet node, Object data) {
261:                Boolean match = (Boolean) super .visit(node, data);
262:                push(match);
263:                return match;
264:            }
265:
266:            public Object visit(ASTHandler node, Object data) {
267:                Boolean match = (Boolean) super .visit(node, data);
268:                push(match);
269:                return match;
270:            }
271:
272:            public Object visit(ASTStaticInitialization node, Object data) {
273:                Boolean match = (Boolean) super .visit(node, data);
274:                push(match);
275:                return match;
276:            }
277:
278:            public Object visit(ASTWithin node, Object data) {
279:                Boolean match = (Boolean) super .visit(node, data);
280:                push(match);
281:                return match;
282:            }
283:
284:            public Object visit(ASTWithinCode node, Object data) {
285:                Boolean match = (Boolean) super .visit(node, data);
286:                push(match);
287:                return match;
288:            }
289:
290:            public Object visit(ASTHasMethod node, Object data) {
291:                Boolean match = (Boolean) super .visit(node, data);
292:                push(match);
293:                return match;
294:            }
295:
296:            public Object visit(ASTHasField node, Object data) {
297:                Boolean match = (Boolean) super .visit(node, data);
298:                push(match);
299:                return match;
300:            }
301:
302:            private void push(Boolean b) {
303:                if (b == null) {
304:                    throw new Error(
305:                            "attempt to push an undetermined match result");
306:                } else if (b.booleanValue()) {
307:                    cv.visitInsn(ICONST_1);
308:                } else {
309:                    cv.visitInsn(ICONST_M1);
310:                }
311:            }
312:        }
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