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Expose v8 CpuProfiler + add fast properties for some window properties

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First, this exposes the v8 Profiler. Right now it's just a commented-out block
in `fetch` and meant for internal debugging.
Depends on: https://github.com/lightpanda-io/zig-v8-fork/pull/105

Use postAttach on Window to attach "static" properties. This comes from
profiling (lightpanda.io) and seeing window.get_self called tens of thousands
of times.
This commit is contained in:
Karl Seguin
2025-10-10 19:48:50 +08:00
parent c502bd901e
commit c381e4153d
6 changed files with 64 additions and 40 deletions
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18
src/main.zig
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@@ -165,6 +165,24 @@ fn run(alloc: Allocator) !void {
// page
const page = try session.createPage();
// // Comment this out to get a profile of the JS code in v8/profile.json.
// // You can open this in Chrome's profiler.
// // I've seen it generate invalid JSON, but I'm not sure why. It only
// // happens rarely, and I manually fix the file.
// page.js.startCpuProfiler();
// defer {
// if (page.js.stopCpuProfiler()) |profile| {
// std.fs.cwd().writeFile(.{
// .sub_path = "v8/profile.json",
// .data = profile,
// }) catch |err| {
// log.err(.app, "profile write error", .{ .err = err });
// };
// } else |err| {
// log.err(.app, "profile error", .{ .err = err });
// }
// }
_ = page.navigate(url, .{}) catch |err| switch (err) {
error.UnsupportedUriScheme, error.UriMissingHost => {
log.fatal(.app, "invalid fetch URL", .{ .err = err, .url = url });