1 files changed, 56 insertions, 0 deletions
diff --git a/js/src/gc/GCTraceFormat.h b/js/src/gc/GCTraceFormat.h
new file mode 100644
index 000000000..82998b37d
--- /dev/null
+++ b/js/src/gc/GCTraceFormat.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef gc_GCTraceFormat_h
+#define gc_GCTraceFormat_h
+
+/*
+ * Each trace is stored as a 64-bit word with the following format:
+ *
+ *                 56              48                                         0
+ * +----------------+----------------+-----------------------------------------+
+ * | Event type     | Optional extra | Optional payload                        |
+ * +----------------+----------------+-----------------------------------------+
+ */
+
+enum GCTraceEvent {
+    // Events
+    TraceEventInit,
+    TraceEventThingSize,
+    TraceEventNurseryAlloc,
+    TraceEventTenuredAlloc,
+    TraceEventClassInfo,
+    TraceEventTypeInfo,
+    TraceEventTypeNewScript,
+    TraceEventCreateObject,
+    TraceEventMinorGCStart,
+    TraceEventPromoteToTenured,
+    TraceEventMinorGCEnd,
+    TraceEventMajorGCStart,
+    TraceEventTenuredFinalize,
+    TraceEventMajorGCEnd,
+
+    TraceDataAddress,  // following TraceEventPromote
+    TraceDataInt,      // following TraceEventClassInfo
+    TraceDataString,   // following TraceEventClassInfo
+
+    GCTraceEventCount
+};
+
+const unsigned TraceFormatVersion = 1;
+
+const unsigned TracePayloadBits = 48;
+
+const unsigned TraceExtraShift = 48;
+const unsigned TraceExtraBits = 8;
+
+const unsigned TraceEventShift = 56;
+const unsigned TraceEventBits = 8;
+
+const unsigned AllocKinds = 22;
+const unsigned LastObjectAllocKind = 11;
+
+#endif