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[sanitizer][Darwin] Define TlsSize on arm64 #133989

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[sanitizer][Darwin] Define TlsSize on arm64 #133989

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[sanitizer][Darwin] Define TlsSize on arm64
speednoisemovement Apr 1, 2025
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speednoisemovement Apr 1, 2025
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Merge branch 'main' into mac_tls
vitalybuka Apr 24, 2025
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speednoisemovement committed Apr 1, 2025
commit 081ce760c09dd7e35ecb805c328d72186952cde9
4 changes: 1 addition & 3 deletions compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
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Expand Up @@ -563,9 +563,7 @@ uptr TlsBaseAddr() {
// defined as `_INTERNAL_POSIX_THREAD_KEYS_MAX +
// `_INTERNAL_POSIX_THREAD_KEYS_END` (512 pointers on iPhone and 768 elsewhere).
// Keep at 1024 for backwards compatibility.
uptr TlsSize() {
return 1024 * sizeof(uptr);
}
uptr TlsSize() { return 1024 * sizeof(uptr); }
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@yln yln Apr 29, 2025

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#if TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
#define _EXTERNAL_POSIX_THREAD_KEYS_MAX 256
#define _INTERNAL_POSIX_THREAD_KEYS_MAX 256
#define _INTERNAL_POSIX_THREAD_KEYS_END 512
#else
#define _EXTERNAL_POSIX_THREAD_KEYS_MAX 512
#define _INTERNAL_POSIX_THREAD_KEYS_MAX 256
#define _INTERNAL_POSIX_THREAD_KEYS_END 768
#endif

void *tsd[_EXTERNAL_POSIX_THREAD_KEYS_MAX + _INTERNAL_POSIX_THREAD_KEYS_MAX];

https://github.com/apple-oss-distributions/libpthread/blob/libpthread-535/src/types_internal.h#L418

512 pointers on iPhone and 768 elsewhere

👍

Currently we are returning 1024 on macOS/Intel or 0 elsewhere, both wrong! :/

@speednoisemovement, can you comment on the "why?", which problem is this solving?

TlsSize() is used only in GetThreadStackAndTls(). What is the nature of this function? Is the conservative answer to return a lower ("only touch this much") or upper ("at least poison this much") bound? Depending on that we should return 512 or 768.

We could also sidestep this question and return the exact answer. Not too much worse since we are already hardcoding a value derived from an internal header in any case.

// Derived from:
// https://github.com/apple-oss-distributions/libpthread/blob/libpthread-535/src/types_internal.h#L418
uptr TlsSize() {
#if SANITIZER_IOS && !SANITIZER_IOSSIM
  return 512 * sizeof(uptr);
#else
  return 768 * sizeof(uptr);
#endif
}

⬆️ Voting for this if others don't have concerns.


void GetThreadStackAndTls(bool main, uptr *stk_begin, uptr *stk_end,
uptr *tls_begin, uptr *tls_end) {
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