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/*
* charybdis: standing on the shoulders of giant build times
*
* Copyright (C) 2016 Charybdis Development Team
* Copyright (C) 2016 Jason Volk <jason@zemos.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <ircd/js/js.h>
#include <js/Initialization.h> // JS_Init() / JS_ShutDown()
#include <mozilla/ThreadLocal.h> // For GetThreadType() linkage hack (see: down)
namespace ircd {
namespace js {
// Logging facility for this submodule with SNOMASK.
struct log::log log
{
"js", 'J'
};
// Location of the thread_local runtext. externs exist in js/runtime.h and js/context.h.
// If these are null, js is not available on your thread.
__thread runtime *rt;
__thread context *cx;
__thread trap *tree;
// Whenever a JSClass is seen by the runtime it has to remain reachable for the lifetime
// of the runtimet. They don't give any further access or callbacks to free the object,
// expecting it to be static or something (yea right). What we have here is a place for
// traps to dump their JSClass on destruction and then this can be reaped later.
std::forward_list<std::unique_ptr<JSClass>> class_drain;
// Handle to the kernel module
ircd::module kernel;
// Internal prototypes
const char *reflect(const ::js::CTypesActivityType &);
} // namespace js
} // namespace ircd
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js.h - Without 3rd party (JSAPI) symbols
//
ircd::js::init::init()
{
log.info("Initializing the JS engine [%s: %s]",
"SpiderMonkey",
version(ver::IMPLEMENTATION));
const scope exit([this]
{
// Ensure ~init() is always safe to call at any intermediate state
if(std::current_exception())
this->~init();
});
if(!JS_Init())
throw error("JS_Init(): failure");
struct runtime::opts runtime_opts;
struct context::opts context_opts;
log.info("Initializing the main JS Runtime (main_maxbytes: %zu)",
runtime_opts.max_bytes);
assert(!rt);
assert(!cx);
rt = new runtime(runtime_opts);
cx = new context(*rt, context_opts);
// Additional options
//set(*cx, JSGC_MODE, JSGC_MODE_INCREMENTAL);
log.info("Initialized main JS Runtime and context (version: '%s')",
version(*cx));
{
// tree is registered by the kernel module's trap
const std::lock_guard<context> lock{*cx};
kernel = ircd::module("kernel");
}
}
ircd::js::init::~init()
noexcept
{
if(cx && !!*cx) try
{
const std::lock_guard<context> lock{*cx};
kernel.reset();
}
catch(const std::exception &e)
{
log.warning("Failed to unload the kernel: %s", e.what());
}
log.info("Terminating the JS Main Runtime");
delete cx; cx = nullptr;
delete rt; rt = nullptr;
log.info("Terminating the JS Engine");
JS_ShutDown();
}
const char *
ircd::js::version(const ver &type)
{
switch(type)
{
case ver::IMPLEMENTATION:
return JS_GetImplementationVersion();
default:
throw error("version(): Unknown version type requested");
}
}
void
__attribute__((noreturn))
js::ReportOutOfMemory(ExclusiveContext *const c)
{
ircd::js::log.critical("jsalloc(): Reported out of memory (ExclusiveContext: %p)", (const void *)c);
std::terminate();
}
//
// This DEBUG section is a fix for linkage errors when SpiderMonkey is compiled
// in debug mode.
//
#ifdef DEBUG
namespace js {
namespace oom {
extern mozilla::ThreadLocal<uint32_t> threadType;
uint32_t
GetThreadType()
{
return threadType.get();
}
} // namespace oom
} // namespace js
#endif // DEBUG
// This was only ever defined for the SpiderMonkey headers and some of our hacks above.
#undef DEBUG
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/js.h - With 3rd party (JSAPI) symbols
//
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/contract.h
//
ircd::js::contract::contract(object::handle future)
:contract{task::get(), future}
{
}
ircd::js::contract::contract(struct task &task,
object::handle future)
:std::weak_ptr<struct task>{weak_from(task)}
,future{future}
{
}
ircd::js::contract::~contract()
noexcept
{
}
void
ircd::js::contract::operator()(const closure &func)
noexcept try
{
log.debug("runtime(%p): RESULT (future: %p)",
(const void *)rt,
(const void *)future.get());
task::enter(*this, [this, &func]
(task &task)
{
try
{
set(future, "value", func());
}
catch(const jserror &e)
{
set(future, "error", e.val.get());
}
catch(const std::exception &e)
{
set(future, "error", e.what());
}
assert(cx->star);
cx->star->completion.push(std::move(*this));
});
}
catch(const std::exception &e)
{
ircd::js::log.critical("contract(%p): %s",
(const void *)this,
e.what());
std::terminate();
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/task.h
//
ircd::js::task::task(const std::string &source)
:task{locale::char16::conv(source)}
{
}
ircd::js::task::task(const std::u16string &source)
try
:pid
{
tasks_insert()
}
,yid
{
0
}
,global{[this]
{
JS::CompartmentOptions opts;
// Global object is constructed using the root trap (JSClass) at *tree;
// This is a thread_local registered by the kernel.so module.
struct global global(*tree, nullptr, opts);
// The root trap is configured with HAS_PRIVATE and that slot is set so we can find this
// `struct task` from the global object using task::get(object). The global object
// can first be found from a context or active compartment. As a convenience `struct task`
// can be found contextually with task::get(void).
JS_SetPrivate(global, this);
return global;
}()}
,main{[this, &source]
() -> script
{
// A compartment for the global must be entered to compile in this scope
const compartment c(this->global);
// TODO: options
JS::CompileOptions opts(*cx);
//opts.setIntroductionType("GeneratorFunction");
//opts.forceAsync = true;
// The compilation is also conducted asynchronously: it will yield the current
// ircd::ctx until it is complete.
return { script::yielding, opts, source };
}()}
,generator{[this]
() -> struct generator
{
// A compartment for the global must be entered to run the generator wrapper.
const compartment c(this->global);
// Run the generator wrapper (main function) returning the generator object.
// The run() closure provides safety for entering the JS engine.
value state(js::run([this]
{
return value{};
//return this->main();
}));
return { state };
}()}
{
}
catch(const std::exception &e)
{
tasks_remove();
}
ircd::js::task::~task()
noexcept
{
run_gc(*rt);
tasks_remove();
}
bool
ircd::js::task::enter(const std::weak_ptr<task> &ptr,
const std::function<void (task &)> &closure)
try
{
const life_guard<struct task> task(ptr);
return enter(*task, closure);
}
catch(const std::bad_weak_ptr &e)
{
ircd::js::log.warning("task::enter(%p, closure: %p): expired task",
(const void *)&ptr,
(const void *)&closure);
return false;
}
bool
ircd::js::task::enter(task &t,
const std::function<void (task &)> &closure)
{
const std::lock_guard<context> lock{*cx};
const compartment compartment(t.global);
run([&closure, &t]
{
closure(t);
});
return true;
}
bool
ircd::js::task::pending_del(const uint64_t &id)
{
const auto ret(pending.erase(id));
if(!ret)
return false;
// When nothing is pending this strong self-reference is dropped and the task
// may be allowed to delete itself.
if(pending.empty())
work.reset();
return true;
}
bool
ircd::js::task::pending_add(const uint64_t &id,
object obj)
{
const auto iit(pending.emplace(id, std::move(obj)));
if(!iit.second)
return false;
// If this is the first pending contract for this task a strong self-reference
// is placed here to ensure the task lingers until all work is completed.
if(pending.size() == 1)
work = shared_from_this();
return true;
}
bool
ircd::js::task::tasks_remove()
{
auto &tasks(cx->star->tasks);
const auto ret(tasks.erase(pid));
log.debug("task(%p) pid[%lu] removed",
(const void *)this,
pid);
assert(ret);
return ret;
}
uint64_t
ircd::js::task::tasks_insert()
{
auto &tasks(cx->star->tasks);
const uint64_t pid(tasks_next_pid());
const auto iit(tasks.emplace(pid, this));
log.debug("task(%p) pid[%lu] added",
(const void *)this,
pid);
assert(iit.second);
return pid;
}
uint64_t
ircd::js::task::tasks_next_pid()
{
auto &tasks(cx->star->tasks);
return tasks.empty()? 0 : std::prev(std::end(tasks))->first + 1;
}
ircd::js::object
ircd::js::reflect(const task &task)
{
const object global(task.global);
const object reflect(get(global, "Reflect"));
const function parse(get(reflect, "parse"));
return parse(global, decompile(task));
}
ircd::js::string
ircd::js::decompile(const task &task,
const bool &pretty)
{
return decompile(task.main, "main", pretty);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/global.h
//
ircd::js::global::global(trap &trap,
JSPrincipals *const &principals,
JS::CompartmentOptions opts)
:object{[&trap, &principals, &opts]
{
opts.setTrace(handle_trace);
return JS_NewGlobalObject(*cx, &trap.jsclass(), principals, JS::DontFireOnNewGlobalHook, opts);
}()}
{
const compartment c(*this);
if(!JS_InitStandardClasses(*cx, *this))
throw error("Failed to init standard classes for global object");
for(auto it(begin(trap.memfun)); it != end(trap.memfun); ++it)
{
trap::function &deffun(*it->second);
deffun(*this);
}
JS_InitReflectParse(*cx, *this);
JS_FireOnNewGlobalObject(*cx, *this);
}
ircd::js::global::~global()
noexcept
{
}
void
ircd::js::global::handle_trace(JSTracer *const tracer,
JSObject *const obj)
noexcept
{
assert(tracer->runtime() == rt->get());
log.debug("runtime(%p): tracer(%p) object(%p)",
(const void *)&our(tracer->runtime()),
(const void *)tracer,
(const void *)obj);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/generator.h
//
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/trap_property.h
//
ircd::js::trap::property::property(struct trap &trap,
std::string name)
try
:trap{&trap}
,name{std::move(name)}
{
const auto it(std::find_if(begin(trap.ps), end(trap.ps), []
(const JSPropertySpec &ps)
{
return !ps.name;
}));
if(it == end(trap.ps))
throw error("out of slots");
{
const auto it(trap.member.emplace(this->name, this));
if(!it.second)
throw error("already exists");
}
JSPropertySpec &spec(*it);
spec.name = this->name.c_str();
spec.flags = JSPROP_SHARED;
spec.getter.native.op = handle_get;
spec.setter.native.op = handle_set;
log.debug("Registered property '%s' on trap '%s'",
this->name.c_str(),
trap.name().c_str());
}
catch(const error &e)
{
throw error("Failed to register property '%s': out slots on trap '%s': %s",
this->name.c_str(),
trap.name().c_str(),
e.what());
}
ircd::js::trap::property::~property()
noexcept
{
assert(trap);
const auto it(std::find_if(begin(trap->ps), end(trap->ps), [this]
(const JSPropertySpec &spec)
{
return name == spec.name;
}));
if(it != end(trap->ps))
{
JSPropertySpec &spec(*it);
memset(&spec, 0x0, sizeof(spec));
}
const size_t erased(trap->member.erase(name));
assert(erased);
}
bool
ircd::js::trap::property::handle_get(JSContext *const c,
const unsigned argc,
JS::Value *const argv)
noexcept try
{
using js::function;
const struct args args(argc, argv);
object that(args.computeThis(c));
function func(args.callee());
const string name(js::name(func));
auto &trap(from(that));
trap.debug(that.get(), "get '%s' (property)",
name.c_str());
property &prop(*trap.member.at(name));
args.rval().set(prop.on_get(func, that));
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto ca(JS::CallArgsFromVp(argc, argv));
object that(ca.computeThis(c));
auto &trap(from(that));
trap.host_exception(that.get(), "property get: %s", e.what());
return false;
}
namespace ircd {
namespace js {
struct foodata
:priv_data
{
trap::property *ptr;
foodata(trap::property *const &ptr = nullptr): ptr{ptr} {}
};
} // namespace js
} // namespace ircd
bool
ircd::js::trap::property::handle_set(JSContext *const c,
const unsigned argc,
JS::Value *const argv)
noexcept try
{
using js::function;
const struct args args(argc, argv);
object that(args.computeThis(c));
function func(args.callee());
const string name(js::name(func));
auto &trap(from(that));
trap.debug(that.get(), "set '%s' (property)",
name.c_str());
property &prop(*trap.member.at(name));
args.rval().set(prop.on_get(func, that));
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto ca(JS::CallArgsFromVp(argc, argv));
object that(ca.computeThis(c));
auto &trap(from(that));
trap.host_exception(that.get(), "property set: %s", e.what());
return false;
}
ircd::js::value
ircd::js::trap::property::on_get(function::handle,
object::handle that)
{
return {};
}
ircd::js::value
ircd::js::trap::property::on_set(function::handle,
object::handle that,
value::handle val)
{
return val;
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/trap_function.h
//
ircd::js::trap::function::function(trap &member,
std::string name,
const uint &arity,
const uint &flags,
const closure &lambda)
:member{&member}
,name{std::move(name)}
,arity{arity}
,flags{flags}
,lambda{lambda}
{
member.memfun.emplace(this->name, this);
}
ircd::js::trap::function::~function()
noexcept
{
member->memfun.erase(this->name);
}
ircd::js::function
ircd::js::trap::function::operator()(const object::handle &obj)
const
{
const auto jsf(::js::DefineFunctionWithReserved(*cx,
obj,
name.c_str(),
handle_call,
arity,
flags));
if(unlikely(!jsf))
throw internal_error("Failed to create trap::function");
js::function ret(jsf);
::js::SetFunctionNativeReserved(ret, 0, pointer_value(this));
return ret;
}
bool
ircd::js::trap::function::handle_call(JSContext *const c,
const unsigned argc,
JS::Value *const argv)
noexcept try
{
assert(&our(c) == cx);
const struct args args(argc, argv);
const object func(args.callee());
const value that(args.computeThis(c));
auto &trap(from(func));
log.debug("trap(%p) this(%p) %s() call argv[%u]",
(const void *)&trap,
(const void *)that.address(),
trap.name.c_str(),
argc);
args.rval().set(trap.on_call(func, that, args));
log.debug("trap(%p) this(%p) %s() leave",
(const void *)&trap,
(const void *)that.address(),
trap.name.c_str());
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
const struct args args(argc, argv);
auto &func(args.callee());
auto &trap(from(&func));
log.error("trap(%p) \"%s()\": %s",
reinterpret_cast<const void *>(&trap),
trap.name.c_str(),
e.what());
JS_ReportError(*cx, "BUG: trap(%p) \"%s()\": %s",
reinterpret_cast<const void *>(&trap),
trap.name.c_str(),
e.what());
return false;
}
ircd::js::trap::function &
ircd::js::trap::function::from(JSObject *const &func)
{
const auto tval(::js::GetFunctionNativeReserved(func, 0));
return *pointer_value<function>(tval);
}
ircd::js::value
ircd::js::trap::function::on_call(object::handle obj,
value::handle val,
const args &args)
{
return lambda(obj, val, args);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/trap.h
//
ircd::js::trap::trap(const std::string &name,
const uint &flags,
const uint &prop_flags)
:trap{*tree, name, flags, prop_flags}
{
}
ircd::js::trap::trap(trap &parent,
const std::string &name,
const uint &flags,
const uint &prop_flags)
:parent{&parent != this? &parent : nullptr}
,_name{name}
,cis{0}
,cds{0}
,sps{0}
,sfs{0}
,ps{0}
,fs{0}
,_class{std::make_unique<JSClass>(JSClass
{
this->_name.c_str(),
flags,
handle_add, // flags & JSCLASS_GLOBAL_FLAGS? nullptr : handle_add,
handle_del,
handle_get,
handle_set,
handle_enu,
handle_has,
nullptr, // JSConvertOp - Obsolete since SpiderMonkey 44 // 45 = mayResolve?
handle_dtor,
handle_call,
handle_inst,
handle_ctor,
flags & JSCLASS_GLOBAL_FLAGS? JS_GlobalObjectTraceHook : handle_trace,
{ this } // reserved[0] TODO: ?????????
})}
,prototrap{nullptr}
{
std::fill(begin(sfs), end(sfs), (JSFunctionSpec)JS_FS_END);
std::fill(begin(fs), end(fs), (JSFunctionSpec)JS_FS_END);
//ps[0].name = "";
//ps[0].flags |= prop_flags;
//ps[0].flags |= JSPROP_ENUMERATE;
add_this();
}
ircd::js::trap::~trap()
noexcept
{
del_this();
assert(_class->reserved[0] == this);
_class->reserved[0] = nullptr;
_class->trace = nullptr;
const auto flags(_class->flags);
memset(_class.get(), 0x0, sizeof(JSClass));
_class->flags = flags;
class_drain.emplace_front(std::move(_class));
}
ircd::js::object
ircd::js::trap::construct(const vector<value>::handle &argv)
{
const object globals;
return construct(globals, argv);
}
ircd::js::object
ircd::js::trap::construct(const object::handle &globals,
const vector<value>::handle &argv)
{
const object prototype(this->prototype(globals));
return JS_New(*cx, prototype, argv);
}
ircd::js::object
ircd::js::trap::prototype(const object::handle &globals)
{
const object super
{
prototrap? prototrap->construct() : object{object::uninitialized}
};
const object proto
{
JS_InitClass(*cx,
globals,
super,
_class.get(),
nullptr,
0,
ps.data(),
fs.data(),
sps.data(),
sfs.data())
};
for(auto it(begin(memfun)); it != end(memfun); ++it)
{
const function &deffun(*it->second);
const js::function func(deffun(proto));
}
JS_DefineConstIntegers(*cx, proto, cis.data());
JS_DefineConstDoubles(*cx, proto, cds.data());
return proto;
}
void
ircd::js::trap::del_this()
try
{
// It is a special condition when the parent is self (this) and the trap has no name.
if(!parent && name().empty())
{
tree = nullptr; // thread_local
return;
}
if(!parent)
return;
if(!parent->children.erase(name()))
throw std::out_of_range("child not in parent's map");
log.debug("Unregistered trap '%s' in `%s'",
name().c_str(),
parent->name().c_str());
}
catch(const std::exception &e)
{
log.error("Failed to unregister object trap '%s' in `%s': %s",
name().c_str(),
parent->name().c_str(),
e.what());
return;
}
void
ircd::js::trap::add_this()
try
{
// It is a special condition when the parent is self (this) and the trap has no name.
if(!parent && name().empty())
{
tree = this; // thread_local
return;
}
if(!parent)
return;
const auto iit(parent->children.emplace(name(), this));
if(!iit.second)
throw error("Failed to overwrite existing");
log.debug("Registered trap '%s' in `%s'",
name().c_str(),
parent->name().c_str());
}
catch(const std::exception &e)
{
log.error("Failed to register object trap '%s' in `%s': %s",
name().c_str(),
parent->name().c_str(),
e.what());
throw;
}
ircd::js::trap &
ircd::js::trap::find(const std::string &path)
{
if(unlikely(!tree))
throw error("Failed to find trap tree root");
trap *ret(tree);
const auto parts(ircd::tokens(path, "."));
for(const auto &part : parts)
ret = &ret->child(part);
return *ret;
}
ircd::js::trap &
ircd::js::trap::find(const string::handle &path)
{
if(unlikely(!tree))
throw error("Failed to find trap tree root");
trap *ret(tree);
tokens(string(path), '.', string_closure<string>([&ret]
(const string &part)
{
ret = &ret->child(part);
}));
return *ret;
}
ircd::js::trap &
ircd::js::trap::child(const std::string &name)
try
{
if(name.empty())
return *this;
return *children.at(name);
}
catch(const std::out_of_range &e)
{
throw reference_error("%s", name.c_str());
}
const ircd::js::trap &
ircd::js::trap::child(const std::string &name)
const
try
{
if(name.empty())
return *this;
return *children.at(name);
}
catch(const std::out_of_range &e)
{
throw reference_error("%s", name.c_str());
}
void
ircd::js::trap::handle_dtor(JSFreeOp *const op,
JSObject *const obj)
noexcept try
{
assert(op);
assert(obj);
assert(&our_runtime(*op) == rt);
auto &trap(from(*obj));
trap.debug(obj, "dtor");
trap.on_gc(obj);
}
catch(const std::exception &e)
{
auto &trap(from(*obj));
log.critical("Unhandled on GC (fop: %p obj: %p): %s",
(const void *)op,
(const void *)obj,
e.what());
assert(0);
}
bool
ircd::js::trap::handle_ctor(JSContext *const c,
unsigned argc,
JS::Value *const argv)
noexcept try
{
assert(&our(c) == cx);
assert(!pending_exception(*cx));
const struct args args(argc, argv);
object that(args.callee());
auto &trap(from(that));
trap.debug(that.get(), "ctor '%s' argv[%zu]",
trap.name().c_str(),
args.size());
object ret(JS_NewObjectWithGivenProto(*cx, &trap.jsclass(), that));
trap.on_new(that, ret, args);
args.rval().set(JS::Value(ret));
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto ca(JS::CallArgsFromVp(argc, argv));
object that(ca.callee());
auto &trap(from(that));
trap.host_exception(that.get(), "ctor: %s", e.what());
return false;
}
bool
ircd::js::trap::handle_call(JSContext *const c,
unsigned argc,
JS::Value *const argv)
noexcept try
{
assert(&our(c) == cx);
assert(!pending_exception(*cx));
const struct args args(argc, argv);
value that(args.computeThis(c));
object func(args.callee());
//auto &trap_that(from(that));
auto &trap_func(from(func));
//trap_that.debug(that.get(), "call: '%s'", trap_func.name().c_str());
trap_func.debug(func.get(), "call argv[%zu]", args.size());
args.rval().set(trap_func.on_call(func, that, args));
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto ca(JS::CallArgsFromVp(argc, argv));
object func(ca.callee());
auto &trap(from(func));
trap.host_exception(func.get(), "call: %s", e.what());
return false;
}
bool
ircd::js::trap::handle_enu(JSContext *const c,
JS::HandleObject obj)
noexcept try
{
assert(&our(c) == cx);
auto &trap(from(obj));
trap.debug(obj.get(), "enumerate");
trap.on_enu(obj);
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto &trap(from(obj));
trap.host_exception(obj.get(), "enu: %s", e.what());
return false;
}
bool
ircd::js::trap::handle_has(JSContext *const c,
JS::HandleObject obj,
JS::HandleId id,
bool *const resolved)
noexcept try
{
assert(&our(c) == cx);
assert(!pending_exception(*cx));
auto &trap(from(obj));
trap.debug(obj.get(), "has '%s'", string(id).c_str());
*resolved = trap.on_has(obj, id);
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto &trap(from(obj));
trap.host_exception(obj.get(), "has '%s': %s",
string(id).c_str(),
e.what());
return false;
}
bool
ircd::js::trap::handle_del(JSContext *const c,
JS::HandleObject obj,
JS::HandleId id,
JS::ObjectOpResult &res)
noexcept try
{
assert(&our(c) == cx);
assert(!pending_exception(*cx));
auto &trap(from(obj));
trap.debug(obj.get(), "del '%s'", string(id).c_str());
if(trap.on_del(obj, id))
res.succeed();
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto &trap(from(obj));
trap.host_exception(obj.get(), "del '%s': %s",
string(id).c_str(),
e.what());
return false;
}
bool
ircd::js::trap::handle_getter(JSContext *const c,
unsigned argc,
JS::Value *const argv)
noexcept try
{
using js::function;
const struct args args(argc, argv);
const object that(args.computeThis(c));
const function func(args.callee());
const string name(js::name(func));
auto &trap(from(that));
trap.debug(that.get(), "get '%s' (getter)",
name.c_str());
//value &val(it->second);
//args.rval().set(val);
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
const auto ca(JS::CallArgsFromVp(argc, argv));
const object that(ca.computeThis(c));
auto &trap(from(that));
trap.host_exception(that.get(), "getter: %s", e.what());
return false;
}
bool
ircd::js::trap::handle_setter(JSContext *const c,
unsigned argc,
JS::Value *const argv)
noexcept try
{
using js::function;
const struct args args(argc, argv);
const object that(args.computeThis(c));
const function func(args.callee());
const value val(args[0]);
const auto type(js::type(val));
const string name(js::name(func));
auto &trap(from(that));
trap.debug(that.get(), "set '%s' (%s) (setter)",
name.c_str(),
reflect(type));
switch(js::type(type))
{
case jstype::OBJECT:
{
//const auto flags(JSPROP_SHARED);
//object ret(JS_DefineObject(*cx, object(val), "", &trap.jsclass(), flags));
//args.rval().set(ret);
//return true;
}
default:
args.rval().set(val);
return true;
}
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
const auto ca(JS::CallArgsFromVp(argc, argv));
const object that(ca.computeThis(c));
auto &trap(from(that));
trap.host_exception(that.get(), "setter: %s", e.what());
return false;
}
bool
ircd::js::trap::handle_get(JSContext *const c,
JS::HandleObject obj,
JS::HandleId id,
JS::MutableHandleValue val)
noexcept try
{
assert(&our(c) == cx);
assert(!pending_exception(*cx));
auto &trap(from(obj));
trap.debug(obj.get(), "get '%s'", string(id).c_str());
const value ret(trap.on_get(obj, id, val));
val.set(ret.get());
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto &trap(from(obj));
trap.host_exception(obj.get(), "get: '%s': %s",
string(id).c_str(),
e.what());
return false;
}
bool
ircd::js::trap::handle_set(JSContext *const c,
JS::HandleObject obj,
JS::HandleId id,
JS::MutableHandleValue val,
JS::ObjectOpResult &res)
noexcept try
{
assert(&our(c) == cx);
assert(!pending_exception(*cx));
auto &trap(from(obj));
trap.debug(obj.get(), "set '%s'", string(id).c_str());
const value ret(trap.on_set(obj, id, val));
val.set(ret.get());
if(!val.isUndefined())
res.succeed();
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto &trap(from(obj));
trap.host_exception(obj.get(), "set '%s': %s",
string(id).c_str(),
e.what());
return false;
}
bool
ircd::js::trap::handle_add(JSContext *const c,
JS::HandleObject obj,
JS::HandleId id,
JS::HandleValue val)
noexcept try
{
assert(&our(c) == cx);
assert(!pending_exception(*cx));
auto &trap(from(obj));
const string name(id);
trap.debug(obj.get(), "add '%s' %s @%p",
name.c_str(),
reflect(type(val)),
(const void *)val.address());
trap.on_add(obj, id, val);
return true;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto &trap(from(obj));
trap.host_exception(obj.get(), "add '%s': %s",
string(id).c_str(),
e.what());
return false;
}
bool
ircd::js::trap::handle_inst(JSContext *const c,
JS::HandleObject obj,
JS::MutableHandleValue val,
bool *const has_instance)
noexcept try
{
assert(&our(c) == cx);
auto &trap(from(obj));
trap.debug(obj.get(), "inst");
return false;
}
catch(const jserror &e)
{
e.set_pending();
return false;
}
catch(const std::exception &e)
{
auto &trap(from(obj));
trap.host_exception(obj.get(), "inst: %s", e.what());
return false;
}
void
ircd::js::trap::handle_trace(JSTracer *const tracer,
JSObject *const obj)
noexcept try
{
assert(cx);
assert(tracer);
assert(obj);
auto &trap(from(*obj));
trap.debug(obj, "trace");
trap.on_trace(obj);
}
catch(const jserror &e)
{
e.set_pending();
return;
}
catch(const std::exception &e)
{
auto &trap(from(*obj));
trap.host_exception(obj, "trace: %s", e.what());
return;
}
ircd::js::trap &
ircd::js::trap::from(const JSObject *const &o)
{
return from(*o);
}
ircd::js::trap &
ircd::js::trap::from(const JSObject &o)
{
auto *const c(JS_GetClass(const_cast<JSObject *>(&o)));
if(!c)
{
log.critical("trap::from(): Trapped on an object without a JSClass!");
std::terminate(); //TODO: exception
}
if(!c->reserved[0])
{
log.critical("trap::from(): Trap called on a trap instance that has gone out of scope!");
std::terminate(); //TODO: exception
}
return *static_cast<trap *>(c->reserved[0]); //TODO: ???
}
void
ircd::js::trap::debug(const void *const &that,
const char *const fmt,
...)
const
{
va_list ap;
va_start(ap, fmt);
char buf[1024];
vsnprintf(buf, sizeof(buf), fmt, ap);
log.debug("trap(%p) this(%p) %s %s",
reinterpret_cast<const void *>(this),
that,
!name().empty()? name().c_str() : "this",
buf);
va_end(ap);
}
void
ircd::js::trap::host_exception(const void *const &that,
const char *const fmt,
...)
const
{
va_list ap;
va_start(ap, fmt);
char buf[1024];
vsnprintf(buf, sizeof(buf), fmt, ap);
log.error("trap(%p) this(%p) \"%s\" %s",
reinterpret_cast<const void *>(this),
that,
name().c_str(),
buf);
JS_ReportError(*cx, "BUG: trap(%p) this(%p) \"%s\" %s",
reinterpret_cast<const void *>(this),
that,
name().c_str(),
buf);
va_end(ap);
}
void
ircd::js::trap::on_gc(JSObject *const &that)
{
if(jsclass().flags & JSCLASS_HAS_PRIVATE)
del(that, priv);
}
void
ircd::js::trap::on_trace(const JSObject *const &)
{
}
void
ircd::js::trap::on_new(object::handle,
object &,
const args &)
{
}
void
ircd::js::trap::on_enu(object::handle)
{
}
bool
ircd::js::trap::on_has(object::handle,
id::handle id)
{
/*
const string sid(id);
if(children.count(sid))
return false;
if(std::any_of(begin(memfun), end(memfun), [&sid]
(const auto &it)
{
const auto &memfun(*it.second);
return sid == memfun.name;
}))
return false;
*/
/*
value val;
const auto flags(JSPROP_SHARED | JSPROP_ENUMERATE);
if(!JS_DefinePropertyById(*cx, obj, id, val, flags, handle_getter, handle_setter))
throw jserror("Failed to define property '%s'", sid.c_str());
*/
// const auto flags(0);
// if(!JS_DefineObject(*cx, obj, sid.c_str(), &jsclass(), flags))
// throw jserror("Failed to define property '%s'", sid.c_str());
return false;
}
bool
ircd::js::trap::on_del(object::handle,
id::handle)
{
return true;
}
void
ircd::js::trap::on_add(object::handle,
id::handle,
value::handle)
{
}
ircd::js::value
ircd::js::trap::on_get(object::handle obj,
id::handle id,
value::handle val)
{
return val;
}
ircd::js::value
ircd::js::trap::on_set(object::handle,
id::handle,
value::handle val)
{
return val;
}
ircd::js::value
ircd::js::trap::on_call(object::handle,
value::handle,
const args &)
{
return {};
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/script.h
//
namespace ircd {
namespace js {
void handle_compile_async(void *, void *) noexcept;
} // namespace js
} // namespace ircd
bool
ircd::js::compilable(const std::string &str,
const object &stack)
{
return compilable(str.c_str(), str.size(), stack);
}
bool
ircd::js::compilable(const char *const &str,
const size_t &len,
const object &stack)
{
return JS_BufferIsCompilableUnit(*cx, stack, str, len);
}
size_t
ircd::js::bytecodes(const JS::Handle<JSScript *> &s,
uint8_t *const &buf,
const size_t &max)
{
uint32_t len;
const custom_ptr<void> ptr
{
JS_EncodeScript(*cx, s, &len), js_free
};
const size_t ret(std::min(size_t(len), max));
memcpy(buf, ptr.get(), ret);
return ret;
}
ircd::js::string
ircd::js::decompile(const JS::Handle<JSScript *> &s,
const char *const &name,
const bool &pretty)
{
uint flags(0);
flags |= pretty;
return JS_DecompileScript(*cx, s, name, flags);
}
ircd::ctx::future<void *>
ircd::js::compile_async(const JS::ReadOnlyCompileOptions &opts,
const std::u16string &src)
{
auto promise(std::make_unique<ctx::promise<void *>>());
if(!JS::CanCompileOffThread(*cx, opts, src.size()))
{
log.warning("context(%p): Rejected asynchronous script compile (script size: %zu)",
(const void *)cx,
src.size());
ctx::future<void *> ret(*promise);
promise->set_value(nullptr);
return ret;
}
if(!JS::CompileOffThread(*cx, opts, src.data(), src.size(), handle_compile_async, promise.get()))
throw internal_error("Failed to compile concurrent script");
return *promise.release();
}
void
ircd::js::handle_compile_async(void *const token,
void *const priv)
noexcept
{
// This frame is entered on a thread owned by SpiderMonkey, not IRCd. Do not call
// ircd::log from here, it is not thread-safe.
/*
printf("[thread %s]: runtime(%p): context(%p): compile(%p) READY (priv: %p)\n",
ircd::string(std::this_thread::get_id()).c_str(),
(const void *)rt,
(const void *)cx,
token,
priv);
*/
// Setting the value of the promise and then deleting the promise is thread-safe.
// Note that JS::FinishOffThreadScript(); will need to be called on the main thread.
auto *const _promise(reinterpret_cast<ctx::promise<void *> *>(priv));
const std::unique_ptr<ctx::promise<void *>> promise(_promise);
promise->set_value(token);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/function_literal.h
//
ircd::js::function_literal::function_literal(const char *const &name,
const std::initializer_list<const char *> &prototype,
const char *const &text)
:root<JSFunction *>{}
,name{name}
,text{text}
,prototype{prototype}
{
JS::CompileOptions opts{*cx};
JS::AutoObjectVector stack{*cx};
if(!JS::CompileFunction(*cx,
stack,
opts,
name,
this->prototype.size(),
&this->prototype.front(),
text,
strlen(text),
&(*this)))
{
throw syntax_error("Failed to compile function literal");
}
}
ircd::js::function_literal::function_literal(function_literal &&other)
noexcept
:root<JSFunction *>
{
std::move(other)
}
,name{std::move(other.name)}
,text{std::move(other.text)}
,prototype{std::move(other.prototype)}
{
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/function.h
//
ircd::js::value
ircd::js::function::operator()(const object::handle &that,
const vector<value>::handle &argv)
const
{
return call(*this, that, argv);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/for_each.h
//
void
ircd::js::for_each(object::handle obj,
const each_key_val &closure)
{
for_each(obj, iter::none, closure);
}
void
ircd::js::for_each(object::handle obj,
const iter &flags,
const each_key_val &closure)
{
for_each(obj, flags, each_id([&obj, &closure]
(const id &key)
{
const value val(get(obj, key));
closure(key, val);
}));
}
void
ircd::js::for_each(object::handle obj,
const each_key &closure)
{
for_each(obj, iter::none, closure);
}
void
ircd::js::for_each(object::handle obj,
const iter &flags,
const each_key &closure)
{
for_each(obj, flags, each_id([&obj, &closure]
(const id &id)
{
closure(id);
}));
}
void
ircd::js::for_each(object::handle obj,
const each_id &closure)
{
for_each(obj, iter::none, closure);
}
void
ircd::js::for_each(object::handle obj,
const iter &flags,
const each_id &closure)
{
vector<id> props;
if(::js::GetPropertyKeys(*cx, obj, uint(flags), &props))
for(size_t i(0); i < props.length(); ++i)
closure(props[i]);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/call.h
//
ircd::js::value
ircd::js::call(const std::string &name,
const object::handle &that,
const vector<value>::handle &args)
{
return call(name.c_str(), that, args);
}
ircd::js::value
ircd::js::call(const char *const &name,
const object::handle &that,
const vector<value>::handle &args)
{
value ret;
if(!JS_CallFunctionName(*cx, that, name, args, &ret))
throw jserror(jserror::pending);
return ret;
}
ircd::js::value
ircd::js::call(const value::handle &val,
const object::handle &that,
const vector<value>::handle &args)
{
value ret;
if(!JS_CallFunctionValue(*cx, that, val, args, &ret))
throw jserror(jserror::pending);
return ret;
}
ircd::js::value
ircd::js::call(const function::handle &func,
const object::handle &that,
const vector<value>::handle &args)
{
value ret;
if(!JS_CallFunction(*cx, that, func, args, &ret))
throw jserror(jserror::pending);
return ret;
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/del.h
//
void
ircd::js::del(const object::handle &src,
const char *const path)
{
value val;
object obj(src);
const char *fail(nullptr);
ircd::tokens(path, ".", [&path, &val, &obj, &fail]
(char *const &part)
{
if(fail)
throw type_error("cannot recurse through non-object '%s' in `%s'", fail, path);
if(!JS_GetProperty(*cx, obj, part, &val) || undefined(val))
throw reference_error("%s", part);
object tmp(obj.get());
if(!JS_ValueToObject(*cx, val, &obj) || !obj.get())
{
fail = part;
obj = std::move(tmp);
}
});
del(obj, id(val));
}
void
ircd::js::del(const object::handle &obj,
const uint32_t &idx)
{
JS::ObjectOpResult res;
if(!JS_DeleteElement(*cx, obj, idx, res))
throw jserror(jserror::pending);
if(!res.checkStrict(*cx, obj))
throw jserror(jserror::pending);
}
void
ircd::js::del(const object::handle &obj,
const id &id)
{
return del(obj, id::handle(id));
}
void
ircd::js::del(const object::handle &obj,
const id::handle &id)
{
JS::ObjectOpResult res;
if(!JS_DeletePropertyById(*cx, obj, id, res))
throw jserror(jserror::pending);
if(!res.checkStrict(*cx, obj, id))
throw jserror(jserror::pending);
}
void
ircd::js::del(JSObject *const &obj,
priv_t)
{
if(unlikely(~flags(obj) & JSCLASS_HAS_PRIVATE))
throw error("del(priv): Object has no private slot");
void *const existing(JS_GetPrivate(obj));
delete reinterpret_cast<priv_ptr *>(existing);
JS_SetPrivate(obj, nullptr);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/set.h
//
void
ircd::js::set(const object::handle &src,
const char *const path,
const value &val)
{
value tmp;
object obj(src);
char buffer[strlen(path) + 1];
const char *fail(nullptr), *key(nullptr);
ircd::tokens(path, ".", buffer, sizeof(buffer), [&path, &tmp, &obj, &fail, &key]
(const char *const &part)
{
if(fail)
throw type_error("cannot recurse through non-object '%s' in `%s'", fail, path);
if(key)
throw reference_error("%s", part);
key = part;
if(strcmp(key, path) == 0)
return;
if(!JS_GetProperty(*cx, obj, part, &tmp) || undefined(tmp))
return;
if(!JS_ValueToObject(*cx, tmp, &obj) || !obj.get())
fail = part;
});
if(!key)
return;
if(!JS_SetProperty(*cx, obj, key, val))
throw jserror(jserror::pending);
}
void
ircd::js::set(const object::handle &obj,
const id &id,
const value &val)
{
set(obj, id::handle(id), val);
}
void
ircd::js::set(const object::handle &obj,
const id::handle &id,
const value &val)
{
set(obj, id, value::handle(val));
}
void
ircd::js::set(const object::handle &obj,
const id::handle &id,
const value::handle &val)
{
if(!JS_SetPropertyById(*cx, obj, id, val))
throw jserror(jserror::pending);
}
void
ircd::js::set(JSObject *const &obj,
priv_data &data)
{
set(obj, shared_from(data));
}
void
ircd::js::set(JSObject *const &obj,
const std::shared_ptr<priv_data> &data)
{
if(unlikely(~flags(obj) & JSCLASS_HAS_PRIVATE))
throw error("set(priv): Object has no private slot");
void *const existing(JS_GetPrivate(obj));
delete reinterpret_cast<priv_ptr *>(existing);
JS_SetPrivate(obj, new priv_ptr(data));
}
void
ircd::js::set(JSObject *const &obj,
const reserved &slot,
const JS::Value &val)
{
JS_SetReservedSlot(obj, uint(slot), val);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/get.h
//
ircd::js::value
ircd::js::get(const object::handle &src,
const char *const path)
{
value ret;
object obj(src);
const char *fail(nullptr);
ircd::tokens(path, ".", [&obj, &path, &ret, &fail]
(const char *const &part)
{
if(fail)
throw type_error("cannot recurse through non-object '%s' in `%s'", fail, path);
if(!JS_GetProperty(*cx, obj, part, &ret) || undefined(ret))
throw reference_error("%s", part);
if(!JS_ValueToObject(*cx, ret, &obj) || !obj.get())
fail = part;
});
return ret;
}
ircd::js::value
ircd::js::get(const object::handle &obj,
const uint32_t &idx)
{
value ret;
if(!JS_GetElement(*cx, obj, idx, &ret) || undefined(ret))
throw reference_error("[%u]", idx);
return ret;
}
ircd::js::value
ircd::js::get(const object::handle &obj,
const id &id)
{
return get(obj, id::handle(id));
}
ircd::js::value
ircd::js::get(const object::handle &obj,
const id::handle &id)
{
value ret;
if(!JS_GetPropertyById(*cx, obj, id, &ret) || undefined(ret))
throw reference_error("%s", string(id).c_str());
return ret;
}
JS::Value
ircd::js::get(JSObject *const &obj,
const reserved &slot)
{
return JS_GetReservedSlot(obj, uint(slot));
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/has.h
//
bool
ircd::js::has(const object::handle &src,
const char *const path)
{
bool ret(true);
object obj(src);
const char *fail(nullptr);
ircd::tokens(path, ".", [&obj, &path, &ret, &fail]
(const char *const &part)
{
if(fail)
throw type_error("cannot recurse through non-object '%s' in `%s'", fail, path);
if(!JS_HasProperty(*cx, obj, part, &ret))
throw jserror(jserror::pending);
if(!ret)
return;
value tmp;
if(!JS_GetProperty(*cx, obj, part, &tmp) || undefined(tmp))
{
ret = false;
return;
}
if(!JS_ValueToObject(*cx, tmp, &obj) || !obj.get())
fail = part;
});
return ret;
}
bool
ircd::js::has(const object::handle &obj,
const uint32_t &idx)
{
bool ret;
if(!JS_HasElement(*cx, obj, idx, &ret))
throw jserror(jserror::pending);
return ret;
}
bool
ircd::js::has(const object::handle &obj,
const id &id)
{
return has(obj, id::handle(id));
}
bool
ircd::js::has(const object::handle &obj,
const id::handle &id)
{
bool ret;
if(!JS_HasPropertyById(*cx, obj, id, &ret))
throw jserror(jserror::pending);
return ret;
}
bool
ircd::js::has(const JSObject *const &obj,
priv_t)
{
if(~flags(obj) & JSCLASS_HAS_PRIVATE)
return false;
const auto vp(JS_GetPrivate(const_cast<JSObject *>(obj)));
const auto sp(reinterpret_cast<const priv_ptr *>(vp));
return sp && !!*sp;
}
bool
ircd::js::has(const JSObject *const &obj,
const reserved &slot)
{
return flags(obj) & JSCLASS_HAS_RESERVED_SLOTS(uint(slot));
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/priv.h
//
// Anchor the struct priv_data vtable here.
ircd::js::priv_data::~priv_data()
noexcept
{
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/string.h
//
char *
ircd::js::c_str(const JSString *const &str)
{
static thread_local char cbuf[CSTR_BUFS][CSTR_BUFSIZE];
static thread_local size_t ctr;
char *const buf(cbuf[ctr]);
native(str, buf, CSTR_BUFSIZE);
ctr = (ctr + 1) % CSTR_BUFS;
return buf;
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/value.h
//
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/json.h
//
namespace ircd {
namespace js {
namespace json {
bool write_callback(const char16_t *, uint32_t, void *) noexcept;
} // namespace json
} // namespace js
} // namespace ircd
ircd::js::value
ircd::js::json::parse(const string &string)
{
value ret;
if(!JS_ParseJSON(*cx, string, &ret))
throw jserror(jserror::pending);
return ret;
}
ircd::js::value
ircd::js::json::parse(const char *const &str)
{
return parse(locale::char16::conv(str));
}
ircd::js::value
ircd::js::json::parse(const std::string &str)
{
return parse(locale::char16::conv(str));
}
ircd::js::value
ircd::js::json::parse(const std::u16string &str)
{
return parse(str.c_str(), str.size());
}
ircd::js::value
ircd::js::json::parse(const char16_t *const &str,
const size_t &size)
{
value ret;
if(!JS_ParseJSON(*cx, str, size, &ret))
throw jserror(jserror::pending);
return ret;
}
std::u16string
ircd::js::json::stringify(const value &val,
const bool &pretty)
{
value v(val);
return stringify(value::handle_mutable(&v), pretty);
}
std::u16string
ircd::js::json::stringify(value &v,
const bool &pretty)
{
return stringify(value::handle_mutable(&v), pretty);
}
std::u16string
ircd::js::json::stringify(const value::handle_mutable &val,
const bool &pretty)
{
const object fmtr;
const string sp(string::literal, pretty? u"\t" : u"");
return stringify(val, fmtr, sp);
}
std::u16string
ircd::js::json::stringify(const value::handle_mutable &val,
const JS::HandleObject &fmtr,
const value &sp)
{
std::u16string ret;
stringify(val, fmtr, sp, [&ret]
(const char16_t *const &ptr, const uint &len)
{
ret.assign(ptr, len);
return true;
});
return ret;
}
void
ircd::js::json::stringify(const value::handle_mutable &val,
const closure &cont)
{
value sp;
object fmtr;
return stringify(val, fmtr, sp, cont);
}
void
ircd::js::json::stringify(const value::handle_mutable &val,
const JS::HandleObject &fmtr,
const value &sp,
const closure &cont)
{
if(!JS_Stringify(*cx, val, fmtr, sp, write_callback, const_cast<closure *>(&cont)))
throw jserror(jserror::pending);
}
bool
ircd::js::json::write_callback(const char16_t *const str,
const uint32_t len,
void *const priv)
noexcept
{
const auto &func(*reinterpret_cast<const closure *>(priv));
return func(str, len);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/native.h
//
namespace ircd {
namespace js {
void native_external_noop(const JSStringFinalizer *const fin, char16_t *const buf);
void native_external_deleter(const JSStringFinalizer *const fin, char16_t *const buf);
JSStringFinalizer native_external_delete
{
native_external_deleter
};
JSStringFinalizer native_external_static
{
native_external_noop
};
} // namespace js
} // namespace ircd
std::string
ircd::js::native(const JSString *const &s)
{
std::string ret(native_size(s) + 1, char());
native(s, &ret.front(), ret.size());
ret.resize(ret.size() - 1);
return ret;
}
size_t
ircd::js::native_size(const JSString *const &s)
{
return JS_GetStringEncodingLength(*cx, const_cast<JSString *>(s));
}
size_t
ircd::js::native(const JSString *const &s,
char *const &buf,
const size_t &max)
{
if(unlikely(!max))
return 0;
ssize_t ret(s? JS_EncodeStringToBuffer(*cx, const_cast<JSString *>(s), buf, max) : 0);
ret = std::max(ret, ssize_t(0));
ret = std::min(ret, ssize_t(max - 1));
buf[ret] = '\0';
return ret;
}
void
ircd::js::native_external_deleter(const JSStringFinalizer *const fin,
char16_t *const buf)
{
log.debug("runtime(%p): string(%p) delete (dtor @%p) \"%s\"",
(const void *)rt,
(const void *)buf,
(const void *)fin,
locale::char16::conv(buf).c_str());
delete[] buf;
}
void
ircd::js::native_external_noop(const JSStringFinalizer *const fin,
char16_t *const buf)
{
log.debug("string literal release (fin: %p buf: %p)",
(const void *)fin,
(const void *)buf);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/error.h
//
ircd::js::jserror::jserror(const JS::Value &val)
:ircd::js::error{generate_skip}
,val{val}
{
}
ircd::js::jserror::jserror(JSObject *const &obj)
:ircd::js::error{generate_skip}
,val{obj? JS::ObjectValue(*obj) : JS::UndefinedValue() }
{
}
ircd::js::jserror::jserror(JSObject &obj)
:ircd::js::error{generate_skip}
,val{JS::ObjectValue(obj)}
{
}
ircd::js::jserror::jserror(generate_skip_t)
:ircd::js::error(generate_skip)
,val{}
{
}
ircd::js::jserror::jserror(const char *const fmt,
...)
:ircd::js::error{generate_skip}
,val{}
{
va_list ap;
va_start(ap, fmt);
generate(JSEXN_ERR, fmt, ap);
va_end(ap);
}
ircd::js::jserror::jserror(const JSErrorReport &report)
:ircd::js::error{generate_skip}
,val{}
{
create(report);
}
ircd::js::jserror::jserror(pending_t)
:ircd::js::error{generate_skip}
,val{}
{
if(unlikely(!restore_exception(*cx)))
{
snprintf(ircd::exception::buf, sizeof(ircd::exception::buf),
"(internal error): Failed to restore exception.");
return;
}
auto &report(cx->report);
if(JS_GetPendingException(*cx, &val))
{
JS::RootedObject obj(*cx, &val.toObject());
if(likely(JS_ErrorFromException(*cx, obj)))
report = *JS_ErrorFromException(*cx, obj);
generate_what_our(report);
JS_ClearPendingException(*cx);
return;
}
switch(report.errorNumber)
{
case 61: // JSAPI's code for interruption
snprintf(ircd::exception::buf, sizeof(ircd::exception::buf),
"interrupted @ line: %u col: %u",
report.lineno,
report.column);
break;
case 105: // JSAPI's code for user reported error
snprintf(ircd::exception::buf, sizeof(ircd::exception::buf),
"(BUG) Host exception");
break;
default:
snprintf(ircd::exception::buf, sizeof(ircd::exception::buf),
"Unknown non-exception #%u flags[%02x]",
report.errorNumber,
report.flags);
break;
}
}
void
ircd::js::jserror::set_pending()
const
{
JS_SetPendingException(*cx, &val);
save_exception(*cx, *JS_ErrorFromException(*cx, object(val.get())));
}
void
ircd::js::jserror::generate(const JSExnType &type,
const char *const &fmt,
va_list ap)
{
ircd::exception::generate(fmt, ap);
const auto msg(locale::char16::conv(what()));
JSErrorReport report;
report.ucmessage = msg.c_str();
report.exnType = type;
create(report);
}
void
ircd::js::jserror::create(const JSErrorReport &report)
{
JSErrorReport cpy(report);
create(cpy);
}
void
ircd::js::jserror::create(JSErrorReport &report)
{
JS::AutoFilename fn;
const auto col(report.column? nullptr : &report.column);
const auto line(report.lineno? nullptr : &report.lineno);
DescribeScriptedCaller(*cx, &fn, line, col);
JS::RootedString msg
{
*cx,
JS_NewUCStringCopyZ(*cx, report.ucmessage)
};
JS::RootedString file
{
*cx,
JS_NewStringCopyZ(*cx, fn.get()?: "<unknown>")
};
JS::RootedObject stack(*cx, nullptr);
const auto type((JSExnType)report.exnType);
if(!JS::CreateError(*cx,
type,
stack,
file,
report.lineno,
report.column,
&report,
msg,
&val))
{
throw error("Failed to construct jserror exception!");
}
JS::Rooted<JSObject *> obj(*cx);
if(unlikely(!JS_ValueToObject(*cx, &val, &obj)))
throw error("Failed to convert value to object on exception!");
JS::Rooted<JS::Value> msgv(*cx, JS::StringValue(msg));
if(unlikely(!JS_SetProperty(*cx, obj, "message", msgv)))
throw error("Failed to set jserror.message property on exception!");
generate_what_our(report);
}
void
ircd::js::jserror::generate_what_our(const JSErrorReport &report)
{
char linebuf[64];
snprintf(linebuf, sizeof(linebuf), "@%u+%u: ",
report.lineno,
report.column);
const auto msg(report.ucmessage? locale::char16::conv(report.ucmessage) : std::string{});
snprintf(ircd::exception::buf, sizeof(ircd::exception::buf), "%s%s%s%s",
reflect((JSExnType)report.exnType),
msg.empty()? "." : ": ",
msg.empty()? "" : !report.lineno && !report.column? "" : linebuf,
msg.c_str());
}
void
ircd::js::jserror::generate_what_js(const JSErrorReport &report)
{
const auto str(native(::js::ErrorReportToString(*cx, const_cast<JSErrorReport *>(&report))));
snprintf(ircd::exception::buf, sizeof(ircd::exception::buf), "%s", str.c_str());
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/debug.h
//
void
ircd::js::log_gcparams()
{
for(int i(0); i < 50; ++i)
{
const auto key(static_cast<JSGCParamKey>(i));
const char *const name(reflect(key));
if(!strlen(name))
continue;
// These trigger assertion failures
switch(key)
{
case JSGC_NUMBER:
case JSGC_MAX_CODE_CACHE_BYTES:
case JSGC_DECOMMIT_THRESHOLD:
continue;
default:
break;
}
log.debug("context(%p) %s => %u",
(const void *)cx,
name,
get(*cx, key));
}
}
void
ircd::js::backtrace()
{
#ifdef JS_DEBUG
::js::DumpBacktrace(*cx);
#endif
}
void
ircd::js::dump(const JSString *const &v)
{
#ifdef JS_DEBUG
::js::DumpString(const_cast<JSString *>(v));
#endif
}
void
ircd::js::dump(const JSAtom *const &v)
{
#ifdef JS_DEBUG
::js::DumpAtom(const_cast<JSAtom *>(v));
#endif
}
void
ircd::js::dump(const JSObject *const &v)
{
#ifdef JS_DEBUG
::js::DumpObject(const_cast<JSObject *>(v));
#endif
}
void
ircd::js::dump(const JS::Value &v)
{
#ifdef JS_DEBUG
::js::DumpValue(v);
#endif
}
void
ircd::js::dump(const jsid &v)
{
#ifdef JS_DEBUG
::js::DumpId(v);
#endif
}
void
ircd::js::dump(const JSContext *v)
{
#ifdef JS_DEBUG
::js::DumpPC(const_cast<JSContext *>(v));
#endif
}
void
ircd::js::dump(const JSScript *const &v)
{
#ifdef JS_DEBUG
::js::DumpScript(*cx, const_cast<JSScript *>(v));
#endif
}
void
ircd::js::dump(const char16_t *const &v, const size_t &len)
{
#ifdef JS_DEBUG
::js::DumpChars(v, len);
#endif
}
void
ircd::js::dump(const ::js::InterpreterFrame *v)
{
#ifdef JS_DEBUG
::js::DumpInterpreterFrame(*cx, const_cast<::js::InterpreterFrame *>(v));
#endif
}
std::string
ircd::js::debug(const JSTracer &t)
{
return t.isMarkingTracer()? "MARKING":
t.isWeakMarkingTracer()? "WEAKMARKING":
t.isTenuringTracer()? "TENURING":
t.isCallbackTracer()? "CALLBACK":
"UNKNOWN";
}
std::string
ircd::js::debug(const JSErrorReport &r)
{
std::stringstream ss;
if(JSREPORT_IS_WARNING(r.flags))
ss << "WARNING ";
if(JSREPORT_IS_EXCEPTION(r.flags))
ss << "EXCEPTION ";
if(JSREPORT_IS_STRICT(r.flags))
ss << "STRICT ";
if(JSREPORT_IS_STRICT_MODE_ERROR(r.flags))
ss << "STRICT_MODE_ERROR ";
if(r.isMuted)
ss << "MUTED ";
if(r.filename)
ss << "file[" << r.filename << "] ";
if(r.lineno)
ss << "line[" << r.lineno << "] ";
if(r.column)
ss << "col[" << r.column << "] ";
if(r.linebuf())
ss << "code[" << r.linebuf() << "] ";
//if(r.tokenptr)
// ss << "toke[" << r.tokenptr << "] ";
if(r.errorNumber)
ss << "errnum[" << r.errorNumber << "] ";
if(r.exnType)
ss << reflect(JSExnType(r.exnType)) << " ";
if(r.ucmessage)
ss << "\"" << locale::char16::conv(r.ucmessage) << "\" ";
for(auto it(r.messageArgs); it && *it; ++it)
ss << "\"" << locale::char16::conv(*it) << "\" ";
return ss.str();
}
std::string
ircd::js::debug(const JS::HandleObject &o)
{
std::stringstream ss;
if(JS_IsGlobalObject(o)) ss << "Global ";
if(JS_IsNative(o)) ss << "Native ";
if(JS::IsCallable(o)) ss << "Callable ";
if(JS::IsConstructor(o)) ss << "Constructor ";
bool ret;
if(JS_IsExtensible(*cx, o, &ret) && ret)
ss << "Extensible ";
if(JS_IsArrayObject(*cx, o, &ret) && ret)
ss << "Array ";
return ss.str();
}
std::string
ircd::js::debug(const JS::Value &v)
{
std::stringstream ss;
if(v.isNull()) ss << "Null ";
if(v.isUndefined()) ss << "Undefined ";
if(v.isBoolean()) ss << "Boolean ";
if(v.isTrue()) ss << "TrueValue ";
if(v.isFalse()) ss << "FalseValue ";
if(v.isNumber()) ss << "Number ";
if(v.isDouble()) ss << "Double ";
if(v.isInt32()) ss << "Int32 ";
if(v.isString()) ss << "String ";
if(v.isObject()) ss << "Object ";
if(v.isSymbol()) ss << "Symbol ";
return ss.str();
}
const char *
ircd::js::reflect_telemetry(const int &id)
{
switch(id)
{
case JS_TELEMETRY_GC_REASON: return "GC_REASON";
case JS_TELEMETRY_GC_IS_COMPARTMENTAL: return "GC_IS_COMPARTMENTAL";
case JS_TELEMETRY_GC_MS: return "GC_MS";
case JS_TELEMETRY_GC_BUDGET_MS: return "GC_BUDGET_MS";
case JS_TELEMETRY_GC_ANIMATION_MS: return "GC_ANIMATION_MS";
case JS_TELEMETRY_GC_MAX_PAUSE_MS: return "GC_MAX_PAUSE_MS";
case JS_TELEMETRY_GC_MARK_MS: return "GC_MARK_MS";
case JS_TELEMETRY_GC_SWEEP_MS: return "GC_SWEEP_MS";
case JS_TELEMETRY_GC_MARK_ROOTS_MS: return "GC_MARK_ROOTS_MS";
case JS_TELEMETRY_GC_MARK_GRAY_MS: return "GC_MARK_GRAY_MS";
case JS_TELEMETRY_GC_SLICE_MS: return "GC_SLICE_MS";
case JS_TELEMETRY_GC_SLOW_PHASE: return "GC_SLOW_PHASE";
case JS_TELEMETRY_GC_MMU_50: return "GC_MMU_50";
case JS_TELEMETRY_GC_RESET: return "GC_RESET";
case JS_TELEMETRY_GC_INCREMENTAL_DISABLED: return "GC_INCREMENTAL_DISABLED";
case JS_TELEMETRY_GC_NON_INCREMENTAL: return "GC_NON_INCREMENTAL";
case JS_TELEMETRY_GC_SCC_SWEEP_TOTAL_MS: return "GC_SCC_SWEEP_TOTAL_MS";
case JS_TELEMETRY_GC_SCC_SWEEP_MAX_PAUSE_MS: return "GC_SCC_SWEEP_MAX_PAUSE_MS";
case JS_TELEMETRY_GC_MINOR_REASON: return "GC_MINOR_REASON";
case JS_TELEMETRY_GC_MINOR_REASON_LONG: return "GC_MINOR_REASON_LONG";
case JS_TELEMETRY_GC_MINOR_US: return "GC_MINOR_US";
case JS_TELEMETRY_DEPRECATED_LANGUAGE_EXTENSIONS_IN_CONTENT: return "DEPRECATED_LANGUAGE_EXTENSIONS_IN_CONTENT";
case JS_TELEMETRY_DEPRECATED_LANGUAGE_EXTENSIONS_IN_ADDONS: return "DEPRECATED_LANGUAGE_EXTENSIONS_IN_ADDONS";
case JS_TELEMETRY_ADDON_EXCEPTIONS: return "ADDON_EXCEPTIONS";
}
return "";
}
const char *
ircd::js::reflect_prop(const uint &flag)
{
switch(flag)
{
case JSPROP_ENUMERATE: return "JSPROP_ENUMERATE";
case JSPROP_READONLY: return "JSPROP_READONLY";
case JSPROP_PERMANENT: return "JSPROP_PERMANENT";
case JSPROP_PROPOP_ACCESSORS: return "JSPROP_PROPOP_ACCESSORS";
case JSPROP_GETTER: return "JSPROP_GETTER";
case JSPROP_SETTER: return "JSPROP_SETTER";
case JSPROP_SHARED: return "JSPROP_SHARED";
case JSPROP_INTERNAL_USE_BIT: return "JSPROP_INTERNAL_USE_BIT";
case JSPROP_DEFINE_LATE: return "JSPROP_DEFINE_LATE";
case JSFUN_STUB_GSOPS: return "JSFUN_STUB_GSOPS";
case JSFUN_CONSTRUCTOR: return "JSFUN_CONSTRUCTOR";
case JSFUN_GENERIC_NATIVE: return "JSFUN_GENERIC_NATIVE";
case JSPROP_REDEFINE_NONCONFIGURABLE: return "JSPROP_REDEFINE_NONCONFIGURABLE";
case JSPROP_RESOLVING: return "JSPROP_RESOLVING";
case JSPROP_IGNORE_ENUMERATE: return "JSPROP_IGNORE_ENUMERATE";
case JSPROP_IGNORE_READONLY: return "JSPROP_IGNORE_READONLY";
case JSPROP_IGNORE_PERMANENT: return "JSPROP_IGNORE_PERMANENT";
case JSPROP_IGNORE_VALUE: return "JSPROP_IGNORE_VALUE";
}
return "";
}
const char *
ircd::js::reflect(const ::js::CTypesActivityType &t)
{
using namespace ::js;
switch(t)
{
case CTYPES_CALL_BEGIN: return "CTYPES_CALL_BEGIN";
case CTYPES_CALL_END: return "CTYPES_CALL_END";
case CTYPES_CALLBACK_BEGIN: return "CTYPES_CALLBACK_BEGIN";
case CTYPES_CALLBACK_END: return "CTYPES_CALLBACK_END";
}
return "";
}
const char *
ircd::js::reflect(const JSContextOp &op)
{
switch(op)
{
case JSCONTEXT_NEW: return "JSCONTEXT_NEW";
case JSCONTEXT_DESTROY: return "JSCONTEXT_DESTROY";
}
return "";
}
const char *
ircd::js::reflect(const JSFinalizeStatus &s)
{
switch(s)
{
case JSFINALIZE_GROUP_START: return "GROUP_START";
case JSFINALIZE_GROUP_END: return "GROUP_END";
case JSFINALIZE_COLLECTION_END: return "COLLECTION_END";
}
return "";
}
const char *
ircd::js::reflect(const JSGCParamKey &s)
{
switch(s)
{
case JSGC_MAX_BYTES: return "JSGC_MAX_BYTES";
case JSGC_MAX_MALLOC_BYTES: return "JSGC_MAX_MALLOC_BYTES";
case JSGC_BYTES: return "JSGC_BYTES";
case JSGC_NUMBER: return "JSGC_NUMBER";
case JSGC_MAX_CODE_CACHE_BYTES: return "JSGC_MAX_CODE_CACHE_BYTES";
case JSGC_MODE: return "JSGC_MODE";
case JSGC_UNUSED_CHUNKS: return "JSGC_UNUSED_CHUNKS";
case JSGC_TOTAL_CHUNKS: return "JSGC_TOTAL_CHUNKS";
case JSGC_SLICE_TIME_BUDGET: return "JSGC_SLICE_TIME_BUDGET";
case JSGC_MARK_STACK_LIMIT: return "JSGC_MARK_STACK_LIMIT";
case JSGC_HIGH_FREQUENCY_TIME_LIMIT: return "JSGC_HIGH_FREQUENCY_TIME_LIMIT";
case JSGC_HIGH_FREQUENCY_LOW_LIMIT: return "JSGC_HIGH_FREQUENCY_LOW_LIMIT";
case JSGC_HIGH_FREQUENCY_HIGH_LIMIT: return "JSGC_HIGH_FREQUENCY_HIGH_LIMIT";
case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX: return "JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX";
case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN: return "JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN";
case JSGC_LOW_FREQUENCY_HEAP_GROWTH: return "JSGC_LOW_FREQUENCY_HEAP_GROWTH";
case JSGC_DYNAMIC_HEAP_GROWTH: return "JSGC_DYNAMIC_HEAP_GROWTH";
case JSGC_DYNAMIC_MARK_SLICE: return "JSGC_DYNAMIC_MARK_SLICE";
case JSGC_ALLOCATION_THRESHOLD: return "JSGC_ALLOCATION_THRESHOLD";
case JSGC_DECOMMIT_THRESHOLD: return "JSGC_DECOMMIT_THRESHOLD";
case JSGC_MIN_EMPTY_CHUNK_COUNT: return "JSGC_MIN_EMPTY_CHUNK_COUNT";
case JSGC_MAX_EMPTY_CHUNK_COUNT: return "JSGC_MAX_EMPTY_CHUNK_COUNT";
case JSGC_COMPACTING_ENABLED: return "JSGC_COMPACTING_ENABLED";
}
return "";
}
const char *
ircd::js::reflect(const JSGCStatus &s)
{
switch(s)
{
case JSGC_BEGIN: return "BEGIN";
case JSGC_END: return "END";
}
return "";
}
const char *
ircd::js::reflect(const JSGCMode &s)
{
switch(s)
{
case JSGC_MODE_GLOBAL: return "GLOBAL";
case JSGC_MODE_COMPARTMENT: return "COMPARTMENT";
case JSGC_MODE_INCREMENTAL: return "INCREMENTAL";
}
return "";
}
const char *
ircd::js::reflect(const JS::GCProgress &s)
{
switch(s)
{
case JS::GC_CYCLE_BEGIN: return "CYCLE_BEGIN";
case JS::GC_SLICE_BEGIN: return "SLICE_BEGIN";
case JS::GC_SLICE_END: return "SLICE_END";
case JS::GC_CYCLE_END: return "CYCLE_END";
}
return "";
}
const char *
ircd::js::reflect(const JSExnType &e)
{
switch(e)
{
case JSEXN_NONE: return "?NONE?";
case JSEXN_ERR: return "Error";
case JSEXN_INTERNALERR: return "InternalError";
case JSEXN_EVALERR: return "EvalError";
case JSEXN_RANGEERR: return "RangeError";
case JSEXN_REFERENCEERR: return "ReferenceError";
case JSEXN_SYNTAXERR: return "SyntaxError";
case JSEXN_TYPEERR: return "TypeError";
case JSEXN_URIERR: return "URIError";
case JSEXN_LIMIT: return "?LIMIT?";
}
return "";
}
const char *
ircd::js::reflect(const JSType &t)
{
switch(t)
{
case JSTYPE_VOID: return "VOID";
case JSTYPE_OBJECT: return "OBJECT";
case JSTYPE_FUNCTION: return "FUNCTION";
case JSTYPE_STRING: return "STRING";
case JSTYPE_NUMBER: return "NUMBER";
case JSTYPE_BOOLEAN: return "BOOLEAN";
case JSTYPE_NULL: return "NULL";
case JSTYPE_SYMBOL: return "SYMBOL";
case JSTYPE_LIMIT: return "LIMIT";
}
return "";
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/compartment.h
//
ircd::js::compartment::compartment(const JSVersion &ver)
:compartment{*cx, ver}
{
}
ircd::js::compartment::compartment(context &c,
const JSVersion &ver)
:compartment
{
current_global(c)?: throw error("Cannot enter compartment without global"),
c,
ver
}
{
}
ircd::js::compartment::compartment(JSObject *const &obj,
const JSVersion &ver)
:compartment{obj, *cx, ver}
{
}
ircd::js::compartment::compartment(JSObject *const &obj,
context &c,
const JSVersion &ver)
:c{&c}
,prev{JS_EnterCompartment(c, obj)}
,ours{current_compartment(c)}
,cprev{static_cast<compartment *>(JS_GetCompartmentPrivate(ours))}
{
JS_SetCompartmentPrivate(ours, this);
JS_SetVersionForCompartment(ours, ver);
}
ircd::js::compartment::compartment(compartment &&other)
noexcept
:c{std::move(other.c)}
,prev{std::move(other.prev)}
,ours{std::move(other.ours)}
,cprev{std::move(other.cprev)}
{
JS_SetCompartmentPrivate(ours, this);
other.ours = nullptr;
}
ircd::js::compartment::~compartment()
noexcept
{
// branch not taken on std::move()
if(ours)
{
JS_SetCompartmentPrivate(ours, cprev);
JS_LeaveCompartment(*c, prev);
}
}
void
ircd::js::for_each_compartment_our(const compartment::closure_our &closure)
{
for_each_compartment([&closure]
(JSCompartment *const &c)
{
if(our(c))
closure(*our(c));
});
}
void
ircd::js::for_each_compartment(const compartment::closure &closure)
{
JS_IterateCompartments(*rt,
const_cast<compartment::closure *>(&closure),
compartment::handle_iterate);
}
void
ircd::js::compartment::handle_iterate(JSRuntime *const rt,
void *const priv,
JSCompartment *const c)
noexcept
{
const auto &closure(*static_cast<compartment::closure *>(priv));
closure(c);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/context.h
//
ircd::js::context::context(const struct opts &opts)
:context{*rt, opts}
{
}
ircd::js::context::context(struct runtime &runtime,
const struct opts &opts)
:custom_ptr<JSContext>
{
// Construct the context
[this, &runtime, &opts]
{
const auto ret(JS_NewContext(runtime, opts.stack_chunk_size));
// Use their privdata pointer to point to our instance. We can then use our(JSContext*)
// to get back to `this` instance.
JS_SetContextPrivate(ret, this);
return ret;
}(),
// Plant the destruction
[](JSContext *const ctx)
noexcept
{
if(!ctx)
return;
// Free the user's privdata managed object
delete static_cast<const priv_data *>(JS_GetSecondContextPrivate(ctx));
JS_DestroyContext(ctx);
}
}
,opts(opts)
,except{nullptr}
,state
{{
0, // Semaphore value starting at 0.
phase::ACCEPT, // ACCEPT phase indicates nothing is running.
irq::JS, // irq::JS is otherwise here in case JS triggers an interrupt.
}}
,timer
{
std::bind(&context::handle_timeout, this)
}
,star{nullptr}
{
assert(&runtime == rt); // Trying to construct on thread without runtime thread_local
timer.set(opts.timer_limit);
}
ircd::js::context::~context()
noexcept
{
}
void
ircd::js::context::handle_timeout()
noexcept
{
// At this time there is no yield logic so if the timer calls the script is terminated.
interrupt(*this, irq::TERMINATE);
}
bool
ircd::js::context::handle_interrupt()
{
auto state(this->state.load(std::memory_order_acquire));
// Spurious interrupt; ignore.
if(unlikely(state.phase != phase::INTR && state.phase != phase::ENTER))
{
log.warning("context(%p): Spurious interrupt (irq: %02x)",
(const void *)this,
uint(state.irq));
return true;
}
// After the interrupt is handled the phase indicates entry back to JS,
// IRQ is left indicating JS in case we don't trigger the next interrupt.
const scope interrupt_return([this, &state]
{
state.phase = phase::ENTER;
state.irq = irq::JS;
this->state.store(state, std::memory_order_release);
});
// Call the user hook if available
if(on_intr)
{
// The user's handler returns -1 for non-overriding behavior
const auto ret(on_intr(state.irq));
if(ret != -1)
return ret;
}
switch(state.irq)
{
default:
case irq::NONE:
assert(0);
case irq::JS:
case irq::USER:
return true;
case irq::YIELD:
ctx::yield();
return true;
case irq::TERMINATE:
return false;
}
}
void
ircd::js::leave(context &c)
{
c.timer.cancel();
// Load the state to keep the current sem value up to date.
// This thread is the only writer to that value.
auto state(c.state.load(std::memory_order_relaxed));
// The ACCEPT phase locks out the interruptor
state.phase = phase::ACCEPT;
// The ACCEPT is released and the current phase seen by interruptor is acquired.
state = c.state.exchange(state, std::memory_order_acq_rel);
// The executor (us) must check if the interruptor (them) has committed to an interrupt
// targeting the JS run we are now leaving. JS may have exited after the commitment
// and before the interrupt arrival.
if(state.phase == phase::INTR)
assert(interrupt_poll(c));
}
void
ircd::js::enter(context &c)
{
// State was already acquired by the last leave();
auto state(c.state.load(std::memory_order_relaxed));
// Increment the semaphore for the next execution;
++state.sem;
// Set the IRQ to JS in case we don't trigger an interrupt, the handler
// will see a correct value.
state.irq = irq::JS;
state.phase = phase::ENTER;
// Commit to next execution.
c.state.store(state, std::memory_order_release);
c.timer.start();
}
bool
ircd::js::interrupt(context &c,
const irq &req)
{
if(req == irq::NONE)
return false;
// Acquire the execution state. Proceed if something was running.
const auto state(c.state.load(std::memory_order_acquire));
if(state.phase != phase::ENTER)
return false;
// The expected value of the state to transact.
struct context::state in
{
state.sem, // Expect the sem value to match, else the execution has changed.
phase::ENTER, // Expect the execution to be occurring.
irq::JS, // JS is always expected here instead of NONE.
};
// The restatement after the transaction.
const struct context::state out
{
state.sem, // Keep the same sem value.
phase::INTR, // Indicate our commitment to interrupting.
req // Include the irq type.
};
// Attempt commitment to interrupt here.
static const auto order_fail(std::memory_order_relaxed);
static const auto order_success(std::memory_order_acq_rel);
if(!c.state.compare_exchange_strong(in, out, order_success, order_fail))
{
// To reliably read from `in` here, order_fail should not be relaxed.
return false;
}
// Commitment now puts the burden on the executor to not allow this interrupt to bleed into
// the next execution, even if JS has already exited before its arrival.
interrupt(c.runtime());
return true;
}
bool
ircd::js::interrupt_poll(const context &c)
{
return JS_CheckForInterrupt(c);
}
bool
ircd::js::restore_exception(context &c)
{
if(unlikely(!c.except))
return false;
JS_RestoreExceptionState(c, c.except);
c.except = nullptr;
return true;
}
void
ircd::js::save_exception(context &c,
const JSErrorReport &report)
{
if(c.except)
{
//throw error("(internal error): Won't overwrite saved exception");
log.warning("save_exception(): Dropping unrestored exception @ %p", (const void *)c.except);
JS_DropExceptionState(*cx, c.except);
}
c.except = JS_SaveExceptionState(c),
c.report = report;
}
bool
ircd::js::run_gc(context &c)
noexcept
{
// JS_MaybeGC dereferences the context's current zone without checking if the context
// is even in a compartment/has a current zone; we must check here.
if(!current_zone(c))
return false;
JS_MaybeGC(c);
return true;
}
void
ircd::js::out_of_memory(context &c)
{
JS_ReportOutOfMemory(c);
}
void
ircd::js::allocation_overflow(context &c)
{
JS_ReportAllocationOverflow(c);
}
uint32_t
ircd::js::get(context &c,
const JSGCParamKey &key)
{
//return JS_GetGCParameterForThread(c, key); // broken
return JS_GetGCParameter(c.runtime(), key);
}
void
ircd::js::set(context &c,
const JSGCParamKey &key,
const uint32_t &val)
{
//JS_SetGCParameterForThread(c, key, val); // broken
JS_SetGCParameter(c.runtime(), key, val);
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/timer.h
//
ircd::js::timer::timer(const callback &timeout)
:finished{false}
,timeout{timeout}
,started{time_point::min()}
,limit{0us}
,state
{{
0, false
}}
,thread{std::bind(&timer::worker, this)}
{
}
ircd::js::timer::~timer()
noexcept
{
// This is all on the main IRCd thread, and the only point when it waits on the timer
// thread. That's okay as long as this is on IRCd shutdown etc.
std::unique_lock<decltype(mutex)> lock(mutex);
finished = true;
// Wait for timer thread to exit. Notify before the unlock() could double tap,
// but should always make for a reliable way to do this shutdown.
cond.notify_all();
lock.unlock();
thread.join();
}
ircd::js::timer::time_point
ircd::js::timer::start()
{
// The counter is incremented indicating a new timing request, invalidating
// anything the timer was previously doing.
auto state(this->state.load(std::memory_order_relaxed));
++state.sem;
state.running = true;
// Commit to starting a new timer operation, unconditionally overwrite previous.
started = steady_clock::now();
this->state.store(state, std::memory_order_release);
// The timing thread is notified here. It may have already started on our new
// request. However, this notifcation must not be delayed and the timing thread
// must wake up soon/now.
cond.notify_one();
return started;
}
bool
ircd::js::timer::cancel()
{
// Relaxed acquire of the state to get the sem value.
auto state(this->state.load(std::memory_order_relaxed));
// Expect the timer to be running and order the timer to idle with an invalidation.
struct state in { state.sem, true };
const struct state out { state.sem + 1, false };
// Commit to cancellation. On a successful state transition, wake up the thread.
static const auto order_fail(std::memory_order_relaxed);
static const auto order_success(std::memory_order_acq_rel);
if(this->state.compare_exchange_strong(in, out, order_success, order_fail))
{
cond.notify_one();
return true;
}
else return false;
}
void
ircd::js::timer::set(const callback &timeout)
{
this->timeout = timeout;
std::atomic_thread_fence(std::memory_order_release);
}
void
ircd::js::timer::set(const microseconds &limit)
{
this->limit.store(limit, std::memory_order_release);
}
void
ircd::js::timer::worker()
{
// This lock is only ever held by this thread except during a finish condition.
// Notifications to the condition are only broadcast by the main thread.
std::unique_lock<decltype(mutex)> lock(mutex);
while(likely(!finished))
handle(lock);
}
void
ircd::js::timer::handle(std::unique_lock<std::mutex> &lock)
{
struct state ours, theirs;
const auto idle_condition([this, &ours]
{
if(unlikely(finished))
return true;
// Acquire the request operation
ours = this->state.load(std::memory_order_acquire);
// Require a start time
if(started == time_point::min())
return false;
return ours.running;
});
const auto cancel_condition([this, &ours, &theirs]
{
if(unlikely(finished))
return true;
// Acquire the request state and compare it to our saved state to see
// if the counter has changed or if there is cancellation.
theirs = this->state.load(std::memory_order_consume);
return ours.sem != theirs.sem || !theirs.running;
});
// Wait for a running condition into `in`
cond.wait(lock, idle_condition);
if(unlikely(finished))
return;
// Wait for timeout or cancellation
const auto limit(this->limit.load(std::memory_order_consume));
if(cond.wait_until(lock, started + limit, cancel_condition))
{
// A cancel or increment of the counter into the next request has occurred.
// This thread will go back to sleep in the idle_condition unless or until
// the next start() is triggered.
return;
}
// A timeout has occurred. This is the last chance for a belated cancellation to be
// observed. If a transition from running to !running can take place on this counter
// value, the user has not invalidated this request and desires the timeout.
assert(ours.running);
const struct state out { ours.sem, false };
static const auto order_fail(std::memory_order_relaxed);
static const auto order_success(std::memory_order_acq_rel);
if(state.compare_exchange_strong(ours, out, order_success, order_fail))
if(likely(timeout))
timeout();
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/runtime.h
//
namespace ircd {
namespace js {
void handle_activity_ctypes(JSContext *, enum ::js::CTypesActivityType) noexcept;
} // namespace js
} // namespace ircd
ircd::js::runtime::runtime(const struct opts &opts,
runtime *const &parent)
:opts(opts)
,tid{std::this_thread::get_id()}
,_ptr
{
JS_NewRuntime(opts.max_bytes,
opts.max_nursery_bytes,
parent? static_cast<JSRuntime *>(*parent) : nullptr),
JS_DestroyRuntime
}
{
// We use their privdata to find `this` via our(JSRuntime*) function.
// Any additional user privdata will have to ride a member in this class itself.
JS_SetRuntimePrivate(get(), this);
JS_SetErrorReporter(get(), handle_error);
JS::SetOutOfMemoryCallback(get(), handle_out_of_memory, nullptr);
JS::SetLargeAllocationFailureCallback(get(), handle_large_allocation_failure, nullptr);
JS_SetGCCallback(get(), handle_gc, nullptr);
JS_SetAccumulateTelemetryCallback(get(), handle_telemetry);
::js::SetPreserveWrapperCallback(get(), handle_preserve_wrapper);
JS_AddFinalizeCallback(get(), handle_finalize, nullptr);
JS_SetGrayGCRootsTracer(get(), handle_trace_gray, nullptr);
JS_AddExtraGCRootsTracer(get(), handle_trace_extra, nullptr);
JS::SetGCSliceCallback(get(), handle_slice);
JS_SetSweepZoneCallback(get(), handle_zone_sweep);
JS_SetDestroyZoneCallback(get(), handle_zone_destroy);
JS_SetCompartmentNameCallback(get(), handle_compartment_name);
JS_SetDestroyCompartmentCallback(get(), handle_compartment_destroy);
JS_SetContextCallback(get(), handle_context, nullptr);
::js::SetActivityCallback(get(), handle_activity, this);
::js::SetCTypesActivityCallback(get(), handle_activity_ctypes);
JS_SetInterruptCallback(get(), handle_interrupt);
JS_SetNativeStackQuota(get(), opts.code_stack_max, opts.trusted_stack_max, opts.untrusted_stack_max);
}
ircd::js::runtime::runtime(runtime &&other)
noexcept
:opts(std::move(other.opts))
,tid{std::move(other.tid)}
,tracing{std::move(other.tracing)}
,_ptr{std::move(other._ptr)}
{
// Branch not taken for null/defaulted instance of JSRuntime smart ptr
if(!!*this)
JS_SetRuntimePrivate(get(), this);
}
ircd::js::runtime &
ircd::js::runtime::operator=(runtime &&other)
noexcept
{
opts = std::move(other.opts);
tid = std::move(other.tid);
tracing = std::move(other.tracing);
_ptr = std::move(other._ptr);
// Branch not taken for null/defaulted instance of JSRuntime smart ptr
if(!!*this)
JS_SetRuntimePrivate(get(), this);
return *this;
}
ircd::js::runtime::~runtime()
noexcept
{
// If items still exist on the tracing lists at this point (runtime shutdown):
// that is bad. The objects are still reachable but should have removed themselves.
if(unlikely(!tracing.heap.empty()))
{
log.critical("runtime(%p): !!! LEAK !!! %zu traceable items still reachable on the heap",
(const void *)this,
tracing.heap.size());
assert(0);
}
}
bool
ircd::js::run_gc(runtime &r)
noexcept
{
JS_GC(r);
return true;
}
bool
ircd::js::runtime::handle_interrupt(JSContext *const ctx)
noexcept
{
log.debug("JSContext(%p): Interrupt", (const void *)ctx);
auto &c(our(ctx));
return c.handle_interrupt();
}
void
ircd::js::runtime::handle_activity(void *const priv,
const bool active)
noexcept
{
assert(priv);
//const auto tid(std::this_thread::get_id());
auto &runtime(*static_cast<struct runtime *>(priv));
log.debug("runtime(%p): %s",
//ircd::string(tid).c_str(),
(const void *)&runtime,
active? "EVENT" : "ACCEPT");
}
void
ircd::js::handle_activity_ctypes(JSContext *const c,
const ::js::CTypesActivityType t)
noexcept
{
log.debug("context(%p): %s",
(const void *)c,
reflect(t));
}
bool
ircd::js::runtime::handle_context(JSContext *const c,
const uint op,
void *const priv)
noexcept
{
log.debug("context(%p): %s (priv: %p)",
(const void *)c,
reflect(static_cast<JSContextOp>(op)),
priv);
return true;
}
bool
ircd::js::runtime::handle_preserve_wrapper(JSContext *const c,
JSObject *const obj)
noexcept
{
log.debug("context(%p): (object: %p) preserve wrapper",
(const void *)c,
(const void *)obj);
return true;
}
void
ircd::js::runtime::handle_gc(JSRuntime *const rt,
const JSGCStatus status,
void *const priv)
noexcept
{
log.debug("runtime(%p): GC %s",
(const void *)rt,
reflect(status));
}
void
ircd::js::runtime::handle_compartment_destroy(JSFreeOp *const fop,
JSCompartment *const compartment)
noexcept
{
log.debug("runtime(%p): compartment: %p %s%sdestroy: fop(%p)",
(const void *)(our_runtime(*fop).get()),
(const void *)compartment,
::js::IsSystemCompartment(compartment)? "[system] " : "",
::js::IsAtomsCompartment(compartment)? "[atoms] " : "",
(const void *)fop);
}
void
ircd::js::runtime::handle_compartment_name(JSRuntime *const rt,
JSCompartment *const compartment,
char *const buf,
const size_t max)
noexcept
{
log.debug("runtime(%p): comaprtment: %p (buf@%p: max: %zu)",
(const void *)rt,
(const void *)compartment,
(const void *)buf,
max);
}
void
ircd::js::runtime::handle_zone_destroy(JS::Zone *const zone)
noexcept
{
log.debug("runtime(%p): zone: %p %s%sdestroy",
(const void *)rt,
(const void *)zone,
::js::IsSystemZone(zone)? "[system] " : "",
::js::IsAtomsZone(zone)? "[atoms] " : "");
}
void
ircd::js::runtime::handle_zone_sweep(JS::Zone *const zone)
noexcept
{
log.debug("runtime(%p): zone: %p %s%ssweep",
(const void *)rt,
(const void *)zone,
::js::IsSystemZone(zone)? "[system] " : "",
::js::IsAtomsZone(zone)? "[atoms] " : "");
}
void
ircd::js::runtime::handle_slice(JSRuntime *const rt,
JS::GCProgress progress,
const JS::GCDescription &d)
noexcept
{
log.debug("runtime(%p): SLICE %s",
(const void *)rt,
reflect(progress));
}
void
ircd::js::runtime::handle_weak_pointer_compartment(JSRuntime *const rt,
JSCompartment *const comp,
void *const data)
noexcept
{
log.debug("runtime(%p): weak pointer compartment(%p) %p",
(const void *)rt,
(const void *)comp,
data);
}
void
ircd::js::runtime::handle_weak_pointer_zone(JSRuntime *const rt,
void *const data)
noexcept
{
log.debug("runtime(%p): weak pointer zone %p",
(const void *)rt,
data);
}
void
ircd::js::runtime::handle_trace_extra(JSTracer *const tracer,
void *const priv)
noexcept
{
log.debug("runtime(%p): tracer(%p) %s: extra (priv: %p) count: %zu",
(const void *)rt,
(const void *)tracer,
debug(*tracer).c_str(),
priv,
rt->tracing.heap.size());
rt->tracing(tracer);
}
void
ircd::js::runtime::handle_trace_gray(JSTracer *const tracer,
void *const priv)
noexcept
{
log.debug("runtime(%p): tracer(%p): gray (priv: %p)",
(const void *)rt,
(const void *)tracer,
priv);
}
void
ircd::js::runtime::handle_finalize(JSFreeOp *const fop,
const JSFinalizeStatus status,
const bool is_compartment,
void *const priv)
noexcept
{
log.debug("fop(%p): %s %s",
(const void *)fop,
reflect(status),
is_compartment? "COMPARTMENT" : "");
}
void
ircd::js::runtime::handle_telemetry(const int id,
const uint32_t sample,
const char *const key)
noexcept
{
//const auto tid(std::this_thread::get_id());
log.debug("runtime(%p): telemetry(%02d) %s: %u %s",
//ircd::string(tid).c_str(),
(const void *)rt,
id,
reflect_telemetry(id),
sample,
key?: "");
}
void
ircd::js::runtime::handle_large_allocation_failure(void *const priv)
noexcept
{
log.error("Large allocation failure");
}
void
ircd::js::runtime::handle_out_of_memory(JSContext *const ctx,
void *const priv)
noexcept
{
log.error("context(%p): out of memory", (const void *)ctx);
}
void
ircd::js::runtime::handle_error(JSContext *const ctx,
const char *const msg,
JSErrorReport *const report)
noexcept try
{
assert(report);
const log::facility facility
{
JSREPORT_IS_WARNING(report->flags)? log::WARNING:
log::DEBUG
};
log(facility, "context(%p): %s",
(const void *)ctx,
debug(*report).c_str());
if(JSREPORT_IS_EXCEPTION(report->flags))
{
save_exception(our(ctx), *report);
return;
}
if(report->exnType == JSEXN_INTERNALERR)
throw internal_error("#%u %s", report->errorNumber, msg);
}
catch(const jserror &e)
{
e.set_pending();
}
catch(const std::exception &e)
{
internal_error ie("%s", e.what());
ie.set_pending();
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/tracing.h
//
namespace ircd {
namespace js {
void trace_heap(JSTracer *const &tracer, tracing::thing &thing);
} // namespace js
} // namespace ircd
ircd::js::tracing::tracing()
{
}
ircd::js::tracing::~tracing()
noexcept
{
assert(heap.empty());
}
void
ircd::js::tracing::operator()(JSTracer *const &tracer)
{
for(auto &thing : rt->tracing.heap)
trace_heap(tracer, thing);
}
void
ircd::js::trace_heap(JSTracer *const &tracer,
tracing::thing &thing)
{
if(thing.type != jstype::OBJECT)
log.debug("runtime(%p): tracer(%p): heap<%s> @ %p",
(const void *)tracer->runtime(),
(const void *)tracer,
reflect(thing.type),
(const void *)thing.ptr);
if(likely(thing.ptr)) switch(thing.type)
{
case jstype::VALUE:
{
const auto ptr(reinterpret_cast<JS::Heap<JS::Value> *>(thing.ptr));
if(!ptr->address())
break;
JS_CallValueTracer(tracer, ptr, "heap");
break;
}
case jstype::OBJECT:
{
const auto ptr(reinterpret_cast<JS::Heap<JSObject *> *>(thing.ptr));
if(!ptr->get())
break;
log.debug("runtime(%p): tracer(%p): heap<%s> @ %p object(%p trap: %p '%s')",
(const void *)tracer->runtime(),
(const void *)tracer,
reflect(thing.type),
(const void *)thing.ptr,
(const void *)ptr->get(),
(const void *)(has_jsclass(*ptr)? &jsclass(*ptr) : nullptr),
has_jsclass(*ptr)? jsclass(*ptr).name : "<no trap>");
JS_CallObjectTracer(tracer, ptr, "heap");
break;
}
case jstype::FUNCTION:
{
const auto ptr(reinterpret_cast<JS::Heap<JSFunction *> *>(thing.ptr));
if(!ptr->get())
break;
JS_CallFunctionTracer(tracer, ptr, "heap");
break;
}
case jstype::SCRIPT:
{
const auto ptr(reinterpret_cast<JS::Heap<JSScript *> *>(thing.ptr));
if(!ptr->get())
break;
JS_CallScriptTracer(tracer, ptr, "heap");
break;
}
case jstype::STRING:
{
const auto ptr(reinterpret_cast<JS::Heap<JSString *> *>(thing.ptr));
if(!ptr->get())
break;
JS_CallStringTracer(tracer, ptr, "heap");
break;
}
case jstype::ID:
{
const auto ptr(reinterpret_cast<JS::Heap<jsid> *>(thing.ptr));
if(!ptr->address())
break;
JS_CallIdTracer(tracer, ptr, "heap");
break;
}
case jstype::SYMBOL:
{
const auto ptr(reinterpret_cast<JS::Heap<JS::Symbol *> *>(thing.ptr));
if(!ptr->get())
break;
break;
}
default:
{
log.warning("runtime(%p): tracer(%p): heap<%s> @ %p",
(const void *)tracer->runtime(),
(const void *)tracer,
reflect(thing.type),
(const void *)thing.ptr);
break;
}
}
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/js/type.h
//
const char *
ircd::js::reflect(const jstype &t)
{
switch(t)
{
case jstype::VALUE: return "VALUE";
case jstype::OBJECT: return "OBJECT";
case jstype::FUNCTION: return "FUNCTION";
case jstype::SCRIPT: return "SCRIPT";
case jstype::STRING: return "STRING";
case jstype::SYMBOL: return "SYMBOL";
case jstype::ID: return "ID";
}
return "";
}
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