Bug 1139834 - TraceLogger: refactor to add fail function, r=bbouvier

js/src/vm/TraceLogging.cpp

@@ -208,27 +208,29 @@ TraceLoggerThread::enable()
     return true;
 }
 
+bool
+TraceLoggerThread::fail(JSContext *cx, const char *error)
+{
+    JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_TRACELOGGER_ENABLE_FAIL, error);
+    failed = true;
+    enabled = 0;
+
+    return false;
+}
+
 bool
 TraceLoggerThread::enable(JSContext *cx)
 {
-    if (!enable()) {
-        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_TRACELOGGER_ENABLE_FAIL,
-                             "internal error");
-        return false;
-    }
+    if (!enable())
+        return fail(cx, "internal error");
 
     if (enabled == 1) {
         // Get the top Activation to log the top script/pc (No inlined frames).
         ActivationIterator iter(cx->runtime());
         Activation *act = iter.activation();
 
-        if (!act) {
-            JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_TRACELOGGER_ENABLE_FAIL,
-                                 "internal error");
-            failed = true;
-            enabled = 0;
-            return false;
-        }
+        if (!act)
+            return fail(cx, "internal error");
 
         JSScript *script = nullptr;
         int32_t engine = 0;
@@ -255,13 +257,8 @@ TraceLoggerThread::enable(JSContext *cx)
 
             script = fp->script();
             engine = TraceLogger_Interpreter;
-            if (script->compartment() != cx->compartment()) {
-                JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_TRACELOGGER_ENABLE_FAIL,
-                                     "compartment mismatch");
-                failed = true;
-                enabled = 0;
-                return false;
-            }
+            if (script->compartment() != cx->compartment())
+                return fail(cx, "compartment mismatch");
         }
 
         TraceLoggerEvent event(this, TraceLogger_Scripts, script);

js/src/vm/TraceLogging.h

@@ -195,6 +195,10 @@ class TraceLoggerThread
     bool enable(JSContext *cx);
     bool disable();
 
+  private:
+    bool fail(JSContext *cx, const char *error);
+
+  public:
     // Given the previous iteration and lastEntryId, return an array of events
     // (there could be lost events). At the same time update the iteration and
     // lastEntry and gives back how many events there are.