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/* 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 */
#include "mozilla/Utf8.h" // mozilla::Utf8Unit
#include "jit/Ion.h" // js::jit::IsIonEnabled
#include "js/CallAndConstruct.h" // JS::CallFunction
#include "js/CompilationAndEvaluation.h" // JS::CompileFunction
#include "js/GlobalObject.h" // JS_NewGlobalObject
#include "js/SourceText.h" // JS::Source{Ownership,Text}
#include "jsapi-tests/tests.h"
#include "util/Text.h"
#include "vm/JSObject-inl.h"
#include "vm/JSScript-inl.h"
using namespace JS;
static void ScriptCallback(JSRuntime* rt, void* data, js::BaseScript* script,
const JS::AutoRequireNoGC& nogc) {
unsigned& count = *static_cast<unsigned*>(data);
if (script->asJSScript()->hasIonScript()) {
BEGIN_TEST(test_PreserveJitCode) {
CHECK(testPreserveJitCode(false, 0));
CHECK(testPreserveJitCode(true, 1));
return true;
unsigned countIonScripts(JSObject* global) {
unsigned count = 0;
js::IterateScripts(cx, global->nonCCWRealm(), &count, ScriptCallback);
return count;
bool testPreserveJitCode(bool preserveJitCode, unsigned remainingIonScripts) {
RootedObject global(cx, createTestGlobal(preserveJitCode));
JSAutoRealm ar(cx, global);
// The Ion JIT may be unavailable due to --disable-jit or lack of support
// for this platform.
if (!js::jit::IsIonEnabled(cx)) {
knownFail = true;
CHECK_EQUAL(countIonScripts(global), 0u);
static constexpr char source[] =
"var i = 0;\n"
"var sum = 0;\n"
"while (i < 10) {\n"
" sum += i;\n"
" ++i;\n"
"return sum;\n";
constexpr unsigned length = js_strlen(source);
JS::SourceText<mozilla::Utf8Unit> srcBuf;
CHECK(srcBuf.init(cx, source, length, JS::SourceOwnership::Borrowed));
JS::CompileOptions options(cx);
options.setFileAndLine(__FILE__, 1);
JS::RootedFunction fun(cx);
JS::RootedObjectVector emptyScopeChain(cx);
fun = JS::CompileFunction(cx, emptyScopeChain, options, "f", 0, nullptr,
RootedValue value(cx);
for (unsigned i = 0; i < 1500; ++i) {
CHECK(JS_CallFunction(cx, global, fun, JS::HandleValueArray::empty(),
CHECK_EQUAL(value.toInt32(), 45);
CHECK_EQUAL(countIonScripts(global), 1u);
NonIncrementalGC(cx, JS::GCOptions::Normal, GCReason::API);
CHECK_EQUAL(countIonScripts(global), remainingIonScripts);
NonIncrementalGC(cx, JS::GCOptions::Shrink, GCReason::API);
CHECK_EQUAL(countIonScripts(global), 0u);
return true;
JSObject* createTestGlobal(bool preserveJitCode) {
JS::RealmOptions options;
return JS_NewGlobalObject(cx, getGlobalClass(), nullptr,
JS::FireOnNewGlobalHook, options);