Support logging interceptions

compiler/preloader/instrumentation/src/org/jetbrains/jet/preloading/instrumentation/InterceptionInstrumenter.java

@@ -98,8 +98,8 @@ public class InterceptionInstrumenter implements Instrumenter {
                         compilePattern(annotation.erasedSignature()),
                         annotation.allowMultipleMatches(),
                         enterData,
-                        exitData
+                        exitData,
-                );
+                        annotation.logInterceptions());
                 instrumenters.add(instrumenter);
                 neverMatchedInstrumenters.add(instrumenter);
             }
@@ -205,6 +205,7 @@ public class InterceptionInstrumenter implements Instrumenter {
                 for (MethodInstrumenter instrumenter : instrumenters) {
                     if (instrumenter.isApplicable(name, desc)) {
                         applicableInstrumenters.add(instrumenter);
+                        instrumenter.reportApplication(cr.getClassName(), name, desc);
 
                         checkMultipleMatches(instrumenter, name, desc);
                         neverMatchedInstrumenters.remove(instrumenter);

compiler/preloader/instrumentation/src/org/jetbrains/jet/preloading/instrumentation/MethodInstrumenter.java

@@ -26,4 +26,6 @@ interface MethodInstrumenter {
     List<MethodData> getEnterData();
 
     boolean allowsMultipleMatches();
+
+    void reportApplication(String className, String methodName, String methodDesc);
 }

compiler/preloader/instrumentation/src/org/jetbrains/jet/preloading/instrumentation/MethodInstrumenterImpl.java

@@ -25,19 +25,22 @@ class MethodInstrumenterImpl implements MethodInstrumenter {
     private final boolean allowMultipleMatches;
     private final List<MethodData> enterData;
     private final List<MethodData> exitData;
+    private final boolean logApplications;
 
     public MethodInstrumenterImpl(
             Pattern namePattern,
             Pattern descPattern,
             boolean allowMultipleMatches,
             List<MethodData> enterData,
-            List<MethodData> exitData
+            List<MethodData> exitData,
+            boolean logApplications
     ) {
         this.namePattern = namePattern;
         this.descPattern = descPattern;
         this.allowMultipleMatches = allowMultipleMatches;
         this.enterData = enterData;
         this.exitData = exitData;
+        this.logApplications = logApplications;
     }
 
     @Override
@@ -45,6 +48,13 @@ class MethodInstrumenterImpl implements MethodInstrumenter {
         return allowMultipleMatches;
     }
 
+    @Override
+    public void reportApplication(String className, String methodName, String methodDesc) {
+        if (logApplications) {
+            System.out.println(toString() + " applied to " + className + ":" + methodName + methodDesc);
+        }
+    }
+
     @Override
     public boolean isApplicable(String name, String desc) {
         return namePattern.matcher(name).matches() && descPattern.matcher(desc).matches();
@@ -62,6 +72,6 @@ class MethodInstrumenterImpl implements MethodInstrumenter {
 
     @Override
     public String toString() {
-        return namePattern + " " + descPattern + (allowMultipleMatches ? "[multiple]" : "");
+        return namePattern + " " + descPattern + (allowMultipleMatches ? " [multiple]" : "");
     }
 }

compiler/preloader/instrumentation/src/org/jetbrains/jet/preloading/instrumentation/MethodInterceptor.java

@@ -35,4 +35,7 @@ public @interface MethodInterceptor {
 
     // if this is false, an exception is thrown when more than one method in the same class matches
     boolean allowMultipleMatches() default false;
+
+    // if true, every method instrumented with this interceptor will be logged to stdout
+    boolean logInterceptions() default false;
 }