Deciding what should be an lp.assert, vs an std.debug.assert, vs a debug-only
assert is a little arbitrary.
debug-only asserts, guarded with an `if (comptime IS_DEBUG)` obviously avoid the
check in release and thus have a performance advantage. We also use them at
library boundaries. If libcurl says it will always emit a header line with a
trailing \r\n, is that really a check we need to do in production? I don't think
so. First, that code path is checked _a lot_ in debug. Second, it feels a bit
like we're testing libcurl (in production!)..why? A debug-only assertion should
be good enough to catch any changes in libcurl.
This adds a crash handler which reports a crash (if telemetry is enabled). On a
crash, this looks for `curl` (using the PATH env), and forks the process to then
call execve. This relies on a new endpoint to be setup to accept the "report".
Also, we include very little data..I figured just knowing about crashes would
be a good place to start.
A panic handler is provided, which override's Zig default handler and hooks
into the crash handler.
An `assert` function is added and hooks into the crash handler. This is
currently only used in one place (Session.zig) to demonstrate its use. In
addition to reporting a failed assert, the assert aborts execution in
ReleaseFast (as opposed to an undefined behavior with std.debug.assert).
I want to hook this into the v8 global error handler, but only after direct_v8
is merged.
Much of this is inspired by bun's code. They have their own assert (1) and
a [more sophisticated] crashHandler (2).
:
(1) beccd01647/src/bun.zig (L2987)
(2) beccd01647/src/crash_handler.zig (L198)
This is the first in a series of changes to make globals explicit. The ultimate
goal of having explicit Globals is to move away from the global HandleScope and
to explicit HandleScopes.
Currently, we treat globals and locals interchangeably. In fact, for Global ->
Local, we just ptrCast. This works because we have 1 global HandleScope, which
effectively disables V8's GC and thus nothing ever gets moved.
If we're going to introduce explicit HandleScopes, then we need to first have
correct Globals. Specifically, when we want to act on the global, we need to
get the local value, and that will eventually mean making sure there's a
HandleScope.
While adding explicit globals, we're keeping the global HandleScope so that we
can minimize the change. So, given that we still have the global HandleScope
the change is largely two things:
1 - js.Function.persit() returns a js.Function.Global. Types that persist global
functions must be updated to js.Function.Global.
2 - To turn js.Function.Global -> js.Function, we need to call .local() on it.
The bridge has been updated to support js.Function.Global for both input and
output parameters. Thus, window.setOnLoad can now directly take a
js.Function.Global, and window.getOnLoad can directly return that
js.Function.Global.
TL;DR - use page.arena instead of page.call_arena
This probably comes from copying the implementation of MutationObserver and/or
IntersectionObserver. But those dispatches are different in that they directly
dispatch a slice (e.g. of MutationRecords) which gets mapped to a v8::Array when
doing the callback. The MutationRecords exist on the heap, not in
_pending_records, so the call_arena is fine.
PerformanceObserver returns an Zig object, not a slice. Therefore it gets mapped
to a v8::Object which references the Zig object. The state of that object, the
_entries list, has to exist for the lifetime of that object, not the call_arena.
