1543819 - Provide API for off-thread UTF-8 compilation

Status: RESOLVED DUPLICATE of bug 1552979

(Core :: JavaScript Engine, task, P3)

Description

[Jeff Walden [:Waldo]]

The off-thread compilation APIs:

extern JS_PUBLIC_API bool CanCompileOffThread(
    JSContext* cx, const ReadOnlyCompileOptions& options, size_t length);

extern JS_PUBLIC_API bool CompileOffThread(
    JSContext* cx, const ReadOnlyCompileOptions& options,
    SourceText<char16_t>& srcBuf, OffThreadCompileCallback callback,
    void* callbackData);

extern JS_PUBLIC_API bool CompileOffThreadModule(
    JSContext* cx, const ReadOnlyCompileOptions& options,
    SourceText<char16_t>& srcBuf, OffThreadCompileCallback callback,
    void* callbackData);

all only handle UTF-16 right now. We're going to need UTF-8 versions of them -- possibly ones that just inflate to UTF-16 to start, then ones that affirmatively do not inflate -- to support direct UTF-8 compilation in those places that don't just do it synchronously.

dom/script/ScriptLoader.cpp which handles non-worker script web script compilation, only acts off-thread, so this is a necessary prerequisite to UTF-8 compilation of normal web scripts.

There's some chance this has some intertwining with bug 1543802 as well, but I'm not sure about that yet.