Bug 913224 - Fix js::DumpHeapComplete() to work with GGC r=billm r=mccr8

js/src/builtin/TestingFunctions.cpp

@@ -827,32 +827,52 @@ FinalizeCount(JSContext *cx, unsigned argc, jsval *vp)
 static bool
 DumpHeapComplete(JSContext *cx, unsigned argc, jsval *vp)
 {
-    const char *fileName = nullptr;
-    JSAutoByteString fileNameBytes;
-    if (argc > 0) {
-        Value v = JS_ARGV(cx, vp)[0];
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    DumpHeapNurseryBehaviour nurseryBehaviour = js::IgnoreNurseryObjects;
+    FILE *dumpFile = NULL;
+
+    unsigned i = 0;
+    if (argc > i) {
+        Value v = args[i];
         if (v.isString()) {
             JSString *str = v.toString();
+            bool same = false;
+            if (!JS_StringEqualsAscii(cx, str, "collectNurseryBeforeDump", &same))
+                return false;
+            if (same) {
+                nurseryBehaviour = js::CollectNurseryBeforeDump;
+                ++i;
+            }
+        }
+    }
+
+    if (argc > i) {
+        Value v = args[i];
+        if (v.isString()) {
+            JSString *str = v.toString();
+            JSAutoByteString fileNameBytes;
             if (!fileNameBytes.encodeLatin1(cx, str))
                 return false;
-            fileName = fileNameBytes.ptr();
+            const char *fileName = fileNameBytes.ptr();
+            dumpFile = fopen(fileName, "w");
+            if (!dumpFile) {
+                JS_ReportError(cx, "can't open %s", fileName);
+                return false;
+            }
+            ++i;
         }
     }
 
-    FILE *dumpFile;
-    if (!fileName) {
-        dumpFile = stdout;
-    } else {
-        dumpFile = fopen(fileName, "w");
-        if (!dumpFile) {
-            JS_ReportError(cx, "can't open %s", fileName);
-            return false;
-        }
+    if (i != argc) {
+        JS_ReportError(cx, "bad arguments passed to dumpHeapComplete");
+        return false;
     }
 
-    js::DumpHeapComplete(JS_GetRuntime(cx), dumpFile);
+    js::DumpHeapComplete(JS_GetRuntime(cx), dumpFile ? dumpFile : stdout, nurseryBehaviour);
 
-    fclose(dumpFile);
+    if (dumpFile)
+        fclose(dumpFile);
 
     JS_SET_RVAL(cx, vp, JSVAL_VOID);
     return true;
@@ -1184,8 +1204,10 @@ static const JSFunctionSpecWithHelp TestingFunctions[] = {
 "  If true, obj is a proxy of some sort"),
 
     JS_FN_HELP("dumpHeapComplete", DumpHeapComplete, 1, 0,
-"dumpHeapComplete([filename])",
-"  Dump reachable and unreachable objects to a file."),
+"dumpHeapComplete(['collectNurseryBeforeDump'], [filename])",
+"  Dump reachable and unreachable objects to the named file, or to stdout.  If\n"
+"  'collectNurseryBeforeDump' is specified, a minor GC is performed first,\n"
+"  otherwise objects in the nursery are ignored."),
 
     JS_FN_HELP("terminate", Terminate, 0, 0,
 "terminate()",

js/src/jit-test/tests/gc/bug-913224.js

@@ -0,0 +1 @@
+dumpHeapComplete();

js/src/jsfriendapi.cpp

@@ -753,6 +753,9 @@ DumpHeapVisitCell(JSRuntime *rt, void *data, void *thing,
 static void
 DumpHeapVisitChild(JSTracer *trc, void **thingp, JSGCTraceKind kind)
 {
+    if (gc::IsInsideNursery(trc->runtime, *thingp))
+        return;
+
     JSDumpHeapTracer *dtrc = static_cast<JSDumpHeapTracer *>(trc);
     char buffer[1024];
     fprintf(dtrc->output, "> %p %c %s\n", *thingp, MarkDescriptor(*thingp),
@@ -762,6 +765,9 @@ DumpHeapVisitChild(JSTracer *trc, void **thingp, JSGCTraceKind kind)
 static void
 DumpHeapVisitRoot(JSTracer *trc, void **thingp, JSGCTraceKind kind)
 {
+    if (gc::IsInsideNursery(trc->runtime, *thingp))
+        return;
+
     JSDumpHeapTracer *dtrc = static_cast<JSDumpHeapTracer *>(trc);
     char buffer[1024];
     fprintf(dtrc->output, "%p %c %s\n", *thingp, MarkDescriptor(*thingp),
@@ -769,10 +775,15 @@ DumpHeapVisitRoot(JSTracer *trc, void **thingp, JSGCTraceKind kind)
 }
 
 void
-js::DumpHeapComplete(JSRuntime *rt, FILE *fp)
+js::DumpHeapComplete(JSRuntime *rt, FILE *fp, js::DumpHeapNurseryBehaviour nurseryBehaviour)
 {
     JSDumpHeapTracer dtrc(fp);
 
+#ifdef JSGC_GENERATIONAL
+    if (nurseryBehaviour == js::CollectNurseryBeforeDump)
+        MinorGC(rt, JS::gcreason::API);
+#endif
+
     JS_TracerInit(&dtrc, rt, DumpHeapVisitRoot);
     dtrc.eagerlyTraceWeakMaps = TraceWeakMapKeysValues;
     TraceRuntime(&dtrc);

js/src/jsfriendapi.h

@@ -255,12 +255,17 @@ GetCompartmentZone(JSCompartment *comp);
 typedef bool
 (* PreserveWrapperCallback)(JSContext *cx, JSObject *obj);
 
+typedef enum  {
+    CollectNurseryBeforeDump,
+    IgnoreNurseryObjects
+} DumpHeapNurseryBehaviour;
+
  /*
   * Dump the complete object graph of heap-allocated things.
   * fp is the file for the dump output.
   */
 extern JS_FRIEND_API(void)
-DumpHeapComplete(JSRuntime *rt, FILE *fp);
+DumpHeapComplete(JSRuntime *rt, FILE *fp, DumpHeapNurseryBehaviour nurseryBehaviour);
 
 #ifdef JS_OLD_GETTER_SETTER_METHODS
 JS_FRIEND_API(bool) obj_defineGetter(JSContext *cx, unsigned argc, JS::Value *vp);

xpcom/base/CycleCollectedJSRuntime.cpp

@@ -968,7 +968,7 @@ CycleCollectedJSRuntime::DeferredFinalize(nsISupports* aSupports)
 void
 CycleCollectedJSRuntime::DumpJSHeap(FILE* file)
 {
-  js::DumpHeapComplete(Runtime(), file);
+  js::DumpHeapComplete(Runtime(), file, js::CollectNurseryBeforeDump);
 }