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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2013 Giovanni Campagna <scampa.giovanni@gmail.com>
#include <config.h>
#include <stdint.h>
#ifdef _WIN32
# include <windows.h>
#endif
#include <utility> // for move
#include <gio/gio.h>
#include <glib.h>
#include <js/Context.h>
#include <js/ContextOptions.h>
#include <js/GCAPI.h> // for JS_SetGCParameter, JS_AddFin...
#include <js/Initialization.h> // for JS_Init, JS_ShutDown
#include <js/Promise.h>
#include <js/RootingAPI.h>
#include <js/Stack.h> // for JS_SetNativeStackQuota
#include <js/TypeDecls.h>
#include <js/Warnings.h>
#include <js/experimental/SourceHook.h>
#include <jsapi.h> // for JS_SetGlobalJitCompilerOption
#include <mozilla/UniquePtr.h>
#include "gjs/context-private.h"
#include "gjs/engine.h"
#include "gjs/jsapi-util.h"
#include "util/log.h"
static void gjs_finalize_callback(JS::GCContext*, JSFinalizeStatus status,
void* data) {
auto* gjs = static_cast<GjsContextPrivate*>(data);
gjs->set_finalize_status(status);
}
static void on_promise_unhandled_rejection(
JSContext* cx, bool mutedErrors [[maybe_unused]], JS::HandleObject promise,
JS::PromiseRejectionHandlingState state, void* data) {
auto gjs = static_cast<GjsContextPrivate*>(data);
uint64_t id = JS::GetPromiseID(promise);
if (state == JS::PromiseRejectionHandlingState::Handled) {
/* This happens when catching an exception from an await expression. */
gjs->unregister_unhandled_promise_rejection(id);
return;
}
JS::RootedObject allocation_site(cx, JS::GetPromiseAllocationSite(promise));
GjsAutoChar stack = gjs_format_stack_trace(cx, allocation_site);
gjs->register_unhandled_promise_rejection(id, std::move(stack));
}
bool gjs_load_internal_source(JSContext* cx, const char* filename, char** src,
size_t* length) {
GError* error = nullptr;
const char* path = filename + 11; // len("resource://")
GBytes* script_bytes =
g_resources_lookup_data(path, G_RESOURCE_LOOKUP_FLAGS_NONE, &error);
if (!script_bytes)
return gjs_throw_gerror_message(cx, error);
*src = static_cast<char*>(g_bytes_unref_to_data(script_bytes, length));
return true;
}
class GjsSourceHook : public js::SourceHook {
bool load(JSContext* cx, const char* filename,
char16_t** two_byte_source [[maybe_unused]], char** utf8_source,
size_t* length) {
// caller owns the source, per documentation of SourceHook
return gjs_load_internal_source(cx, filename, utf8_source, length);
}
};
#ifdef G_OS_WIN32
HMODULE gjs_dll;
static bool gjs_is_inited = false;
BOOL WINAPI
DllMain (HINSTANCE hinstDLL,
DWORD fdwReason,
LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH: {
gjs_dll = hinstDLL;
const char* reason = JS_InitWithFailureDiagnostic();
if (reason)
g_error("Could not initialize JavaScript: %s", reason);
gjs_is_inited = true;
} break;
case DLL_THREAD_DETACH:
JS_ShutDown ();
break;
default:
/* do nothing */
;
}
return TRUE;
}
#else
class GjsInit {
public:
GjsInit() {
const char* reason = JS_InitWithFailureDiagnostic();
if (reason)
g_error("Could not initialize JavaScript: %s", reason);
}
~GjsInit() {
JS_ShutDown();
}
explicit operator bool() const { return true; }
};
static GjsInit gjs_is_inited;
#endif
JSContext* gjs_create_js_context(GjsContextPrivate* uninitialized_gjs) {
g_assert(gjs_is_inited);
JSContext *cx = JS_NewContext(32 * 1024 * 1024 /* max bytes */);
if (!cx)
return nullptr;
if (!JS::InitSelfHostedCode(cx)) {
JS_DestroyContext(cx);
return nullptr;
}
// For additional context on these options, see
// https://searchfox.org/mozilla-esr91/rev/c49725508e97c1e2e2bb3bf9ed0ba14b2016abac/js/public/GCAPI.h#53
JS_SetNativeStackQuota(cx, 1024 * 1024);
JS_SetGCParameter(cx, JSGC_MAX_BYTES, -1);
JS_SetGCParameter(cx, JSGC_INCREMENTAL_GC_ENABLED, 1);
JS_SetGCParameter(cx, JSGC_SLICE_TIME_BUDGET_MS, 10); /* ms */
/* set ourselves as the private data */
JS_SetContextPrivate(cx, uninitialized_gjs);
JS_AddFinalizeCallback(cx, gjs_finalize_callback, uninitialized_gjs);
JS::SetWarningReporter(cx, gjs_warning_reporter);
JS::SetJobQueue(cx, dynamic_cast<JS::JobQueue*>(uninitialized_gjs));
JS::SetPromiseRejectionTrackerCallback(cx, on_promise_unhandled_rejection,
uninitialized_gjs);
// We use this to handle "lazy sources" that SpiderMonkey doesn't need to
// keep in memory. Most sources should be kept in memory, but we can skip
// doing that for the realm bootstrap code, as it is already in memory in
// the form of a GResource. Instead we use the "source hook" to retrieve it.
auto hook = mozilla::MakeUnique<GjsSourceHook>();
js::SetSourceHook(cx, std::move(hook));
if (g_getenv("GJS_DISABLE_EXTRA_WARNINGS")) {
g_warning(
"GJS_DISABLE_EXTRA_WARNINGS has been removed, GJS no longer logs "
"extra warnings.");
}
bool enable_jit = !(g_getenv("GJS_DISABLE_JIT"));
if (enable_jit) {
gjs_debug(GJS_DEBUG_CONTEXT, "Enabling JIT");
}
JS::ContextOptionsRef(cx).setAsmJS(enable_jit);
uint32_t value = enable_jit ? 1 : 0;
JS_SetGlobalJitCompilerOption(
cx, JSJitCompilerOption::JSJITCOMPILER_ION_ENABLE, value);
JS_SetGlobalJitCompilerOption(
cx, JSJitCompilerOption::JSJITCOMPILER_BASELINE_ENABLE, value);
JS_SetGlobalJitCompilerOption(
cx, JSJitCompilerOption::JSJITCOMPILER_BASELINE_INTERPRETER_ENABLE, value);
return cx;
}
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