From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 js/src/jsapi-tests/testGCOutOfMemory.cpp | 69 ++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 js/src/jsapi-tests/testGCOutOfMemory.cpp

(limited to 'js/src/jsapi-tests/testGCOutOfMemory.cpp')

diff --git a/js/src/jsapi-tests/testGCOutOfMemory.cpp b/js/src/jsapi-tests/testGCOutOfMemory.cpp
new file mode 100644
index 000000000..9f8302890
--- /dev/null
+++ b/js/src/jsapi-tests/testGCOutOfMemory.cpp
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ *
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor: Igor Bukanov
+ */
+
+#include "jsapi-tests/tests.h"
+
+BEGIN_TEST(testGCOutOfMemory)
+{
+    JS::RootedValue root(cx);
+
+    // Count the number of allocations until we hit OOM, and store it in 'max'.
+    static const char source[] =
+        "var max = 0; (function() {"
+        "    var array = [];"
+        "    for (; ; ++max)"
+        "        array.push({});"
+        "    array = []; array.push(0);"
+        "})();";
+    JS::CompileOptions opts(cx);
+    bool ok = JS::Evaluate(cx, opts, source, strlen(source), &root);
+
+    /* Check that we get OOM. */
+    CHECK(!ok);
+    CHECK(JS_GetPendingException(cx, &root));
+    CHECK(root.isString());
+    bool match = false;
+    CHECK(JS_StringEqualsAscii(cx, root.toString(), "out of memory", &match));
+    CHECK(match);
+    JS_ClearPendingException(cx);
+
+    JS_GC(cx);
+
+    // The above GC should have discarded everything. Verify that we can now
+    // allocate half as many objects without OOMing.
+    EVAL("(function() {"
+         "    var array = [];"
+         "    for (var i = max >> 2; i != 0;) {"
+         "        --i;"
+         "        array.push({});"
+         "    }"
+         "})();", &root);
+    CHECK(!JS_IsExceptionPending(cx));
+    return true;
+}
+
+virtual JSContext* createContext() override {
+    // Note that the max nursery size must be less than the whole heap size, or
+    // the test will fail because 'max' (the number of allocations required for
+    // OOM) will be based on the nursery size, and that will overflow the
+    // tenured heap, which will cause the second pass with max/4 allocations to
+    // OOM. (Actually, this only happens with nursery zeal, because normally
+    // the nursery will start out with only a single chunk before triggering a
+    // major GC.)
+    JSContext* cx = JS_NewContext(1024 * 1024, 128 * 1024);
+    if (!cx)
+        return nullptr;
+    setNativeStackQuota(cx);
+    return cx;
+}
+
+virtual void destroyContext() override {
+    JS_DestroyContext(cx);
+}
+
+END_TEST(testGCOutOfMemory)
-- 
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