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revise assembly test for the _mi_threadid(); fix issue #495 with musl libc on arm; test specifically for bionic libc on Android

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daan 2022-01-01 15:54:06 -08:00
parent 6ead2840ec
commit 43e5cd2671
1 changed files with 68 additions and 54 deletions
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42
include/mimalloc-internal.h
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@ -698,8 +698,10 @@ static inline size_t _mi_os_numa_node_count(void) {
// -------------------------------------------------------------------
// Getting the thread id should be performant as it is called in the
// fast path of `_mi_free` and we specialize for various platforms.
// We only require _mi_threadid() to return a unique id for each thread.
// -------------------------------------------------------------------
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
@ -707,10 +709,17 @@ static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
return (uintptr_t)NtCurrentTeb();
}
#elif defined(__GNUC__) && \
(defined(__x86_64__) || defined(__i386__) || defined(__aarch64__))
// We use assembly for a fast thread id on the main platforms. The TLS layout depends on
// both the OS and libc implementation so we use specific tests for each main platform.
// If you test on another platform and it works please send a PR :-)
// see also https://akkadia.org/drepper/tls.pdf for more info on the TLS register.
#elif defined(__GNUC__) && ( \
(defined(__GLIBC__) && (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))) \
|| (defined(__APPLE__) && (defined(__x86_64__) || defined(__aarch64__))) \
|| (defined(__BIONIC__) && (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))) \
|| (defined(__FreeBSD__) && (defined(__x86_64__) || defined(__i386__) || defined(__aarch64__))) \
)
static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
void* res;
const size_t ofs = (slot*sizeof(void*));
@ -722,15 +731,14 @@ static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
__asm__("movl %%fs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x32 ABI
#elif defined(__x86_64__)
__asm__("movq %%fs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x86_64 Linux, BSD uses FS
#elif defined(__arm__) // arm32: defined but currently not used (see issue #495)
#elif defined(__arm__)
void** tcb; MI_UNUSED(ofs);
__asm__ volatile ("mrc p15, 0, %0, c13, c0, 3\nbic %0, %0, #3" : "=r" (tcb));
res = tcb[slot];
#elif defined(__aarch64__)
void** tcb; MI_UNUSED(ofs);
#if defined(__APPLE__) // M1, issue #343
__asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
tcb = (void**)((uintptr_t)tcb & ~0x07UL); // clear lower 3 bits
__asm__ volatile ("mrs %0, tpidrro_el0\nbic %0, %0, #7" : "=r" (tcb));
#else
__asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
#endif
@ -739,13 +747,13 @@ static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
return res;
}
// setting a tls slot is only used on macOSX for now
// setting a tls slot is only used on macOS for now
static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
const size_t ofs = (slot*sizeof(void*));
#if defined(__i386__)
__asm__("movl %1,%%gs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // 32-bit always uses GS
#elif defined(__APPLE__) && defined(__x86_64__)
__asm__("movq %1,%%gs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // x86_64 macOSX uses GS
__asm__("movq %1,%%gs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // x86_64 macOS uses GS
#elif defined(__x86_64__) && (MI_INTPTR_SIZE==4)
__asm__("movl %1,%%fs:%0" : "=m" (*((void**)ofs)) : "rn" (value) : ); // x32 ABI
#elif defined(__x86_64__)
@ -757,8 +765,7 @@ static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
#elif defined(__aarch64__)
void** tcb; MI_UNUSED(ofs);
#if defined(__APPLE__) // M1, issue #343
__asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
tcb = (void**)((uintptr_t)tcb & ~0x07UL); // clear lower 3 bits
__asm__ volatile ("mrs %0, tpidrro_el0\nbic %0, %0, #7" : "=r" (tcb));
#else
__asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
#endif
@ -767,21 +774,28 @@ static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
}
static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
#if defined(__ANDROID__) && (defined(__arm__) || defined(__aarch64__))
// issue #384, #495: on arm Android, slot 1 is the thread ID (pointer to pthread internal struct)
#if defined(__BIONIC__)
// issue #384, #495: on the Bionic libc (Android), slot 1 is the thread id
// see: https://github.com/aosp-mirror/platform_bionic/blob/c44b1d0676ded732df4b3b21c5f798eacae93228/libc/platform/bionic/tls_defines.h#L86
return (uintptr_t)mi_tls_slot(1);
#else
// in all our other targets, slot 0 is the pointer to the thread control block
// in all our other targets, slot 0 is the thread id
// glibc: https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=sysdeps/x86_64/nptl/tls.h
// apple: https://github.com/apple/darwin-xnu/blob/main/libsyscall/os/tsd.h#L36
return (uintptr_t)mi_tls_slot(0);
#endif
}
#else
// otherwise use portable C
// otherwise use portable C, taking the address of a thread local variable (this is still very fast on most platforms).
static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
return (uintptr_t)&_mi_heap_default;
}
#endif
// -----------------------------------------------------------------------
// Count bits: trailing or leading zeros (with MI_INTPTR_BITS on all zero)
// -----------------------------------------------------------------------