[PATCH] D104248: [compiler-rt][hwasan] Refactor Thread::Init

[Roland McGrath via Phabricator via cfe-commits]

mcgrathr added inline comments.


================
Comment at: compiler-rt/lib/hwasan/hwasan_linux.cpp:430
 
+void Thread::Init(uptr stack_buffer_start, uptr stack_buffer_size) {
+  CHECK_EQ(0, unique_id_);  // try to catch bad stack reuse
----------------
vitalybuka wrote:
> leonardchan wrote:
> > leonardchan wrote:
> > > mcgrathr wrote:
> > > > Most of this code can actually be reused for Fuchsia (just not necessarily in Thread::Init).
> > > > It's probably better to split it up for reuse rather than just moving the whole thing to linux-specific.
> > > So maybe something like the current patch? Then on Fuchsia we could (1) have a custom implementation of `InitStackAndTls`, (2) wrap the call to `Thread::InitStackRingBuffer` in `Thread::Init` with a `#if SANITIZER_FUCHSIA` so it's not called before thread creation, then (2) call `Thread::InitStackRingBuffer` in the `__sanitizer_thread_start_hook` hook.
> > Sorry. Meant wrapping with a `#if !SANITIZER_FUCHSIA`.
> in other sanitizers only GetThreadStackAndTls is platform specific
> 
> in other sanitizers only GetThreadStackAndTls is platform specific

That's not entirely accurate.  AsanThread::SetThreadStackAndTls might be a model here.  But asan on Fuchsia also splits up the initialization into pre-creation and on-created-thread portions (AsanThread::Init is called before thread creation, and AsanThreadRegistry::StartThread is called on the created thread).



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  https://reviews.llvm.org/D104248/new/

https://reviews.llvm.org/D104248