1 files changed, 72 insertions, 0 deletions
diff --git a/js/src/devtools/rootAnalysis/t/suppression/source.cpp b/js/src/devtools/rootAnalysis/t/suppression/source.cpp
new file mode 100644
index 0000000000..56e458bdaa
--- /dev/null
+++ b/js/src/devtools/rootAnalysis/t/suppression/source.cpp
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#define ANNOTATE(property) __attribute__((annotate(property)))
+
+struct Cell {
+  int f;
+} ANNOTATE("GC Thing");
+
+class AutoSuppressGC_Base {
+ public:
+  AutoSuppressGC_Base() {}
+  ~AutoSuppressGC_Base() {}
+} ANNOTATE("Suppress GC");
+
+class AutoSuppressGC_Child : public AutoSuppressGC_Base {
+ public:
+  AutoSuppressGC_Child() : AutoSuppressGC_Base() {}
+};
+
+class AutoSuppressGC {
+  AutoSuppressGC_Child helpImBeingSuppressed;
+
+ public:
+  AutoSuppressGC() {}
+};
+
+extern void GC() ANNOTATE("GC Call");
+
+void GC() {
+  // If the implementation is too trivial, the function body won't be emitted at
+  // all.
+  asm("");
+}
+
+extern void foo(Cell*);
+
+void suppressedFunction() {
+  GC();  // Calls GC, but is always called within AutoSuppressGC
+}
+
+void halfSuppressedFunction() {
+  GC();  // Calls GC, but is sometimes called within AutoSuppressGC
+}
+
+void unsuppressedFunction() {
+  GC();  // Calls GC, never within AutoSuppressGC
+}
+
+void f() {
+  Cell* cell1 = nullptr;
+  Cell* cell2 = nullptr;
+  Cell* cell3 = nullptr;
+  {
+    AutoSuppressGC nogc;
+    suppressedFunction();
+    halfSuppressedFunction();
+  }
+  foo(cell1);
+  halfSuppressedFunction();
+  foo(cell2);
+  unsuppressedFunction();
+  {
+    // Old bug: it would look from the first AutoSuppressGC constructor it
+    // found to the last destructor. This statement *should* have no effect.
+    AutoSuppressGC nogc;
+  }
+  foo(cell3);
+}