mozjs_sys 0.67.1

/* 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/. */

extern crate mozjs_sys;

use mozjs_sys::jsapi::JS;
use mozjs_sys::jsapi::JS::OnNewGlobalHookOption::FireOnNewGlobalHook;
use mozjs_sys::jsapi::JSCLASS_GLOBAL_APPLICATION_SLOTS;
use mozjs_sys::jsapi::JSCLASS_IS_GLOBAL;
use mozjs_sys::jsapi::JSCLASS_RESERVED_SLOTS_SHIFT;
use mozjs_sys::jsapi::JSClass;
use mozjs_sys::jsapi::JSClassOps;
use mozjs_sys::jsapi::JSContext;
use mozjs_sys::jsapi::JSProtoKey;
use mozjs_sys::jsapi::JS_DestroyContext;
use mozjs_sys::jsapi::JS_GlobalObjectTraceHook;
use mozjs_sys::jsapi::JS_NewGlobalObject;
use mozjs_sys::jsapi::JS_NewContext;
use mozjs_sys::jsapi::JS_ShutDown;
use mozjs_sys::jsapi::glue::JS_Init;
use mozjs_sys::jsapi::glue::JS_NewRealmOptions;
use mozjs_sys::jsapi::glue::JS_NewOwningCompileOptions;

use std::mem;
use std::ptr;

// Some constants that are #defined in jsapi, so not exposed by bindgen
const JSCLASS_GLOBAL_SLOT_COUNT: u32 = JSCLASS_GLOBAL_APPLICATION_SLOTS + (JSProtoKey::JSProto_LIMIT as u32) * 3 + 36;
const JSCLASS_GLOBAL_FLAGS: u32 = JSCLASS_IS_GLOBAL | (JSCLASS_GLOBAL_SLOT_COUNT << JSCLASS_RESERVED_SLOTS_SHIFT);
    
// The class operations for the global object.
static GLOBAL_CLASS_OPS: JSClassOps = JSClassOps {
    addProperty: None,
    delProperty: None,
    enumerate: None,
    newEnumerate: None,
    resolve: None,
    mayResolve: None,
    finalize: None,
    call: None,
    hasInstance: None,
    construct: None,
    trace: Some(JS_GlobalObjectTraceHook),
};

// The class of the global object.
static GLOBAL_CLASS: JSClass = JSClass {
    name: "global\0" as *const str as *const i8,
    flags:  JSCLASS_GLOBAL_FLAGS,
    cOps: &GLOBAL_CLASS_OPS,
    reserved: [ ptr::null_mut(),  ptr::null_mut(),  ptr::null_mut() ],
};

#[test]
fn main() {
    // https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_User_Guide
    unsafe {
        // Initialize the JS engine.
        assert!(JS_Init());

        // Create a JS context.
        let heap_size = 64 * 1024 * 1024;
        let nursery_size = 8 * 1024 * 1024;
        let cx: *mut JSContext = JS_NewContext(heap_size, nursery_size, ptr::null_mut());
        assert!(!cx.is_null());
        assert!(JS::InitSelfHostedCode(cx));

        // Create the global object and a new compartment.
        // THIS IS DANGEROUS since the global isn't rooted.
        let options = JS_NewRealmOptions();
        let global = JS_NewGlobalObject(
            cx,
            &GLOBAL_CLASS,
            ptr::null_mut(),
            FireOnNewGlobalHook,
            &options
        );
        let realm = JS::EnterRealm(cx, global);

        let options = JS_NewOwningCompileOptions(cx);
        let mut rval: JS::Value = mem::zeroed();
        let mut rval_handle: JS::MutableHandleValue = mem::zeroed();
        rval_handle.ptr = &mut rval;

        // Evaluate 1+1.
        let script = "1+1".as_bytes();
        assert!(JS::EvaluateUtf8(cx, &options._base, &script[0] as *const _ as *const _, script.len(), rval_handle));
        assert!(rval.to_int32() == 2);

        // Shut everything down.
        JS::LeaveRealm(cx, realm);
        JS_DestroyContext(cx);
        JS_ShutDown();
    }
}