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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
*
* Any copyright is dedicated to the Public Domain.
* Contributor: Igor Bukanov
*/
#include "mozilla/Utf8.h" // mozilla::Utf8Unit
#include "gc/GCEnum.h" // js::gc::ZealMode
#include "js/CompilationAndEvaluation.h" // JS::Evaluate
#include "js/SourceText.h" // JS::Source{Ownership,Text}
#include "jsapi-tests/tests.h"
BEGIN_TEST(testGCOutOfMemory) {
// 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);
JS::SourceText<mozilla::Utf8Unit> srcBuf;
CHECK(srcBuf.init(cx, source, strlen(source), JS::SourceOwnership::Borrowed));
JS::RootedValue root(cx);
bool ok = JS::Evaluate(cx, opts, srcBuf, &root);
/* Check that we get OOM. */
CHECK(!ok);
CHECK(JS_GetPendingException(cx, &root));
CHECK(root.isString());
bool match = false;
CHECK(JS_StringEqualsLiteral(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(4 * 1024 * 1024);
if (!cx) {
return nullptr;
}
JS_SetGCParameter(cx, JSGC_MAX_NURSERY_BYTES, js::gc::ChunkSize);
#ifdef JS_GC_ZEAL
JS_UnsetGCZeal(cx, uint8_t(js::gc::ZealMode::GenerationalGC));
#endif
return cx;
}
END_TEST(testGCOutOfMemory)