head	1.4;
access;
symbols
	netbsd-11-0-RC6:1.3
	netbsd-11-0-RC5:1.3
	netbsd-11-0-RC4:1.3
	netbsd-11-0-RC3:1.3
	netbsd-11-0-RC2:1.3
	netbsd-11-0-RC1:1.3
	gcc-14-3-0:1.1.1.4
	perseant-exfatfs-base-20250801:1.3
	netbsd-11:1.3.0.4
	netbsd-11-base:1.3
	gcc-12-5-0:1.1.1.3
	perseant-exfatfs-base-20240630:1.3
	gcc-12-4-0:1.1.1.3
	perseant-exfatfs:1.3.0.2
	perseant-exfatfs-base:1.3
	gcc-12-3-0:1.1.1.3
	gcc-10-5-0:1.1.1.2
	gcc-10-4-0:1.1.1.2
	cjep_sun2x:1.2.0.4
	cjep_sun2x-base:1.2
	cjep_staticlib_x-base1:1.2
	cjep_staticlib_x:1.2.0.2
	cjep_staticlib_x-base:1.2
	gcc-10-3-0:1.1.1.1
	FSF:1.1.1;
locks; strict;
comment	@// @;


1.4
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branches;
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1.3
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1.2
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1.1
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1.1.1.2
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1.1.1.3
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1.1.1.4
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desc
@@


1.4
log
@merge GCC 14.3.0.
@
text
@//===-- asan_malloc_linux.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Linux-specific malloc interception.
// We simply define functions like malloc, free, realloc, etc.
// They will replace the corresponding libc functions automagically.
//===----------------------------------------------------------------------===//

#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_FREEBSD || SANITIZER_FUCHSIA || SANITIZER_LINUX || \
    SANITIZER_NETBSD || SANITIZER_SOLARIS

#  include "asan_allocator.h"
#  include "asan_interceptors.h"
#  include "asan_internal.h"
#  include "asan_stack.h"
#  include "lsan/lsan_common.h"
#  include "sanitizer_common/sanitizer_allocator_checks.h"
#  include "sanitizer_common/sanitizer_allocator_dlsym.h"
#  include "sanitizer_common/sanitizer_errno.h"
#  include "sanitizer_common/sanitizer_tls_get_addr.h"

// ---------------------- Replacement functions ---------------- {{{1
using namespace __asan;

struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
  static bool UseImpl() { return AsanInitIsRunning(); }
  static void OnAllocate(const void *ptr, uptr size) {
#  if CAN_SANITIZE_LEAKS
    // Suppress leaks from dlerror(). Previously dlsym hack on global array was
    // used by leak sanitizer as a root region.
    __lsan_register_root_region(ptr, size);
#  endif
  }
  static void OnFree(const void *ptr, uptr size) {
#  if CAN_SANITIZE_LEAKS
    __lsan_unregister_root_region(ptr, size);
#  endif
  }
};

INTERCEPTOR(void, free, void *ptr) {
  if (DlsymAlloc::PointerIsMine(ptr))
    return DlsymAlloc::Free(ptr);
  GET_STACK_TRACE_FREE;
  asan_free(ptr, &stack, FROM_MALLOC);
}

#if SANITIZER_INTERCEPT_CFREE
INTERCEPTOR(void, cfree, void *ptr) {
  if (DlsymAlloc::PointerIsMine(ptr))
    return DlsymAlloc::Free(ptr);
  GET_STACK_TRACE_FREE;
  asan_free(ptr, &stack, FROM_MALLOC);
}
#endif // SANITIZER_INTERCEPT_CFREE

INTERCEPTOR(void*, malloc, uptr size) {
  if (DlsymAlloc::Use())
    return DlsymAlloc::Allocate(size);
  ENSURE_ASAN_INITED();
  GET_STACK_TRACE_MALLOC;
  return asan_malloc(size, &stack);
}

INTERCEPTOR(void*, calloc, uptr nmemb, uptr size) {
  if (DlsymAlloc::Use())
    return DlsymAlloc::Callocate(nmemb, size);
  ENSURE_ASAN_INITED();
  GET_STACK_TRACE_MALLOC;
  return asan_calloc(nmemb, size, &stack);
}

INTERCEPTOR(void*, realloc, void *ptr, uptr size) {
  if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr))
    return DlsymAlloc::Realloc(ptr, size);
  ENSURE_ASAN_INITED();
  GET_STACK_TRACE_MALLOC;
  return asan_realloc(ptr, size, &stack);
}

#if SANITIZER_INTERCEPT_REALLOCARRAY
INTERCEPTOR(void*, reallocarray, void *ptr, uptr nmemb, uptr size) {
  ENSURE_ASAN_INITED();
  GET_STACK_TRACE_MALLOC;
  return asan_reallocarray(ptr, nmemb, size, &stack);
}
#endif  // SANITIZER_INTERCEPT_REALLOCARRAY

#if SANITIZER_INTERCEPT_MEMALIGN
INTERCEPTOR(void*, memalign, uptr boundary, uptr size) {
  GET_STACK_TRACE_MALLOC;
  return asan_memalign(boundary, size, &stack, FROM_MALLOC);
}

INTERCEPTOR(void*, __libc_memalign, uptr boundary, uptr size) {
  GET_STACK_TRACE_MALLOC;
  void *res = asan_memalign(boundary, size, &stack, FROM_MALLOC);
  DTLS_on_libc_memalign(res, size);
  return res;
}
#endif // SANITIZER_INTERCEPT_MEMALIGN

#if SANITIZER_INTERCEPT_ALIGNED_ALLOC
INTERCEPTOR(void*, aligned_alloc, uptr boundary, uptr size) {
  GET_STACK_TRACE_MALLOC;
  return asan_aligned_alloc(boundary, size, &stack);
}
#endif // SANITIZER_INTERCEPT_ALIGNED_ALLOC

INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
  GET_CURRENT_PC_BP_SP;
  (void)sp;
  return asan_malloc_usable_size(ptr, pc, bp);
}

#if SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
// We avoid including malloc.h for portability reasons.
// man mallinfo says the fields are "long", but the implementation uses int.
// It doesn't matter much -- we just need to make sure that the libc's mallinfo
// is not called.
struct fake_mallinfo {
  int x[10];
};

INTERCEPTOR(struct fake_mallinfo, mallinfo, void) {
  struct fake_mallinfo res;
  REAL(memset)(&res, 0, sizeof(res));
  return res;
}

INTERCEPTOR(int, mallopt, int cmd, int value) {
  return 0;
}
#endif // SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO

INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) {
  GET_STACK_TRACE_MALLOC;
  return asan_posix_memalign(memptr, alignment, size, &stack);
}

INTERCEPTOR(void*, valloc, uptr size) {
  GET_STACK_TRACE_MALLOC;
  return asan_valloc(size, &stack);
}

#if SANITIZER_INTERCEPT_PVALLOC
INTERCEPTOR(void*, pvalloc, uptr size) {
  GET_STACK_TRACE_MALLOC;
  return asan_pvalloc(size, &stack);
}
#endif // SANITIZER_INTERCEPT_PVALLOC

INTERCEPTOR(void, malloc_stats, void) {
  __asan_print_accumulated_stats();
}

#if SANITIZER_ANDROID
// Format of __libc_malloc_dispatch has changed in Android L.
// While we are moving towards a solution that does not depend on bionic
// internals, here is something to support both K* and L releases.
struct MallocDebugK {
  void *(*malloc)(uptr bytes);
  void (*free)(void *mem);
  void *(*calloc)(uptr n_elements, uptr elem_size);
  void *(*realloc)(void *oldMem, uptr bytes);
  void *(*memalign)(uptr alignment, uptr bytes);
  uptr (*malloc_usable_size)(void *mem);
};

struct MallocDebugL {
  void *(*calloc)(uptr n_elements, uptr elem_size);
  void (*free)(void *mem);
  fake_mallinfo (*mallinfo)(void);
  void *(*malloc)(uptr bytes);
  uptr (*malloc_usable_size)(void *mem);
  void *(*memalign)(uptr alignment, uptr bytes);
  int (*posix_memalign)(void **memptr, uptr alignment, uptr size);
  void* (*pvalloc)(uptr size);
  void *(*realloc)(void *oldMem, uptr bytes);
  void* (*valloc)(uptr size);
};

ALIGNED(32) const MallocDebugK asan_malloc_dispatch_k = {
    WRAP(malloc),  WRAP(free),     WRAP(calloc),
    WRAP(realloc), WRAP(memalign), WRAP(malloc_usable_size)};

ALIGNED(32) const MallocDebugL asan_malloc_dispatch_l = {
    WRAP(calloc),         WRAP(free),               WRAP(mallinfo),
    WRAP(malloc),         WRAP(malloc_usable_size), WRAP(memalign),
    WRAP(posix_memalign), WRAP(pvalloc),            WRAP(realloc),
    WRAP(valloc)};

namespace __asan {
void ReplaceSystemMalloc() {
  void **__libc_malloc_dispatch_p =
      (void **)AsanDlSymNext("__libc_malloc_dispatch");
  if (__libc_malloc_dispatch_p) {
    // Decide on K vs L dispatch format by the presence of
    // __libc_malloc_default_dispatch export in libc.
    void *default_dispatch_p = AsanDlSymNext("__libc_malloc_default_dispatch");
    if (default_dispatch_p)
      *__libc_malloc_dispatch_p = (void *)&asan_malloc_dispatch_k;
    else
      *__libc_malloc_dispatch_p = (void *)&asan_malloc_dispatch_l;
  }
}
}  // namespace __asan

#else  // SANITIZER_ANDROID

namespace __asan {
void ReplaceSystemMalloc() {
}
}  // namespace __asan
#endif  // SANITIZER_ANDROID

#endif  // SANITIZER_FREEBSD || SANITIZER_FUCHSIA || SANITIZER_LINUX ||
        // SANITIZER_NETBSD || SANITIZER_SOLARIS
@


1.3
log
@make this actually be GCC 12.3.0's libsanitizer.

the libsanitizer we used with GCC 9 and GCC 10 was significantly
ahead of the GCC 9 and GCC 10 provided versions.
@
text
@d34 1
a34 1
  static bool UseImpl() { return asan_init_is_running; }
@


1.2
log
@revert sanitizer back to the version we were using with GCC 9, since
that one was already newer than the GCC 10 version.
@
text
@d18 1
a18 1
    SANITIZER_NETBSD || SANITIZER_RTEMS || SANITIZER_SOLARIS
d20 9
a28 8
#include "sanitizer_common/sanitizer_allocator_checks.h"
#include "sanitizer_common/sanitizer_errno.h"
#include "sanitizer_common/sanitizer_tls_get_addr.h"
#include "asan_allocator.h"
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_malloc_local.h"
#include "asan_stack.h"
d33 8
a40 29
static uptr allocated_for_dlsym;
static uptr last_dlsym_alloc_size_in_words;
static const uptr kDlsymAllocPoolSize = SANITIZER_RTEMS ? 4096 : 1024;
static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];

static INLINE bool IsInDlsymAllocPool(const void *ptr) {
  uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
  return off < allocated_for_dlsym * sizeof(alloc_memory_for_dlsym[0]);
}

static void *AllocateFromLocalPool(uptr size_in_bytes) {
  uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
  void *mem = (void*)&alloc_memory_for_dlsym[allocated_for_dlsym];
  last_dlsym_alloc_size_in_words = size_in_words;
  allocated_for_dlsym += size_in_words;
  CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
  return mem;
}

static void DeallocateFromLocalPool(const void *ptr) {
  // Hack: since glibc 2.27 dlsym no longer uses stack-allocated memory to store
  // error messages and instead uses malloc followed by free. To avoid pool
  // exhaustion due to long object filenames, handle that special case here.
  uptr prev_offset = allocated_for_dlsym - last_dlsym_alloc_size_in_words;
  void *prev_mem = (void*)&alloc_memory_for_dlsym[prev_offset];
  if (prev_mem == ptr) {
    REAL(memset)(prev_mem, 0, last_dlsym_alloc_size_in_words * kWordSize);
    allocated_for_dlsym = prev_offset;
    last_dlsym_alloc_size_in_words = 0;
d42 4
a45 55
}

static int PosixMemalignFromLocalPool(void **memptr, uptr alignment,
                                      uptr size_in_bytes) {
  if (UNLIKELY(!CheckPosixMemalignAlignment(alignment)))
    return errno_EINVAL;

  CHECK(alignment >= kWordSize);

  uptr addr = (uptr)&alloc_memory_for_dlsym[allocated_for_dlsym];
  uptr aligned_addr = RoundUpTo(addr, alignment);
  uptr aligned_size = RoundUpTo(size_in_bytes, kWordSize);

  uptr *end_mem = (uptr*)(aligned_addr + aligned_size);
  uptr allocated = end_mem - alloc_memory_for_dlsym;
  if (allocated >= kDlsymAllocPoolSize)
    return errno_ENOMEM;

  allocated_for_dlsym = allocated;
  *memptr = (void*)aligned_addr;
  return 0;
}

#if SANITIZER_RTEMS
void* MemalignFromLocalPool(uptr alignment, uptr size) {
  void *ptr = nullptr;
  alignment = Max(alignment, kWordSize);
  PosixMemalignFromLocalPool(&ptr, alignment, size);
  return ptr;
}

bool IsFromLocalPool(const void *ptr) {
  return IsInDlsymAllocPool(ptr);
}
#endif

static INLINE bool MaybeInDlsym() {
  // Fuchsia doesn't use dlsym-based interceptors.
  return !SANITIZER_FUCHSIA && asan_init_is_running;
}

static INLINE bool UseLocalPool() {
  return EarlyMalloc() || MaybeInDlsym();
}

static void *ReallocFromLocalPool(void *ptr, uptr size) {
  const uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
  const uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
  void *new_ptr;
  if (UNLIKELY(UseLocalPool())) {
    new_ptr = AllocateFromLocalPool(size);
  } else {
    ENSURE_ASAN_INITED();
    GET_STACK_TRACE_MALLOC;
    new_ptr = asan_malloc(size, &stack);
d47 1
a47 3
  internal_memcpy(new_ptr, ptr, copy_size);
  return new_ptr;
}
d50 2
a52 4
  if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
    DeallocateFromLocalPool(ptr);
    return;
  }
d58 2
a60 2
  if (UNLIKELY(IsInDlsymAllocPool(ptr)))
    return;
d66 2
a67 3
  if (UNLIKELY(UseLocalPool()))
    // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
    return AllocateFromLocalPool(size);
d74 2
a75 3
  if (UNLIKELY(UseLocalPool()))
    // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
    return AllocateFromLocalPool(nmemb * size);
d82 2
a83 4
  if (UNLIKELY(IsInDlsymAllocPool(ptr)))
    return ReallocFromLocalPool(ptr, size);
  if (UNLIKELY(UseLocalPool()))
    return AllocateFromLocalPool(size);
a144 2
  if (UNLIKELY(UseLocalPool()))
    return PosixMemalignFromLocalPool(memptr, alignment, size);
@


1.1
log
@Initial revision
@
text
@@


1.1.1.1
log
@initial import of GCC 10.3.0.  main changes include:

caveats:
- ABI issue between c++14 and c++17 fixed
- profile mode is removed from libstdc++
- -fno-common is now the default

new features:
- new flags -fallocation-dce, -fprofile-partial-training,
  -fprofile-reproducible, -fprofile-prefix-path, and -fanalyzer
- many new compile and link time optimisations
- enhanced drive optimisations
- openacc 2.6 support
- openmp 5.0 features
- new warnings: -Wstring-compare and -Wzero-length-bounds
- extended warnings: -Warray-bounds, -Wformat-overflow,
  -Wrestrict, -Wreturn-local-addr, -Wstringop-overflow,
  -Warith-conversion, -Wmismatched-tags, and -Wredundant-tags
- some likely C2X features implemented
- more C++20 implemented
- many new arm & intel CPUs known

hundreds of reported bugs are fixed.  full list of changes
can be found at:

   https://gcc.gnu.org/gcc-10/changes.html
@
text
@@


1.1.1.2
log
@initial import of GCC 10.4.0 sources.

mostly a large list of PRs fixed (210 total), plus one x86-64
specific change related to MMX and 64 bit integer return.

https://gcc.gnu.org/gcc-10/changes.html links to the full list
of PRs fixed.
@
text
@d34 1
a34 1
static const uptr kDlsymAllocPoolSize = SANITIZER_RTEMS ? 4096 : 8192;
@


1.1.1.3
log
@initial import of GCC 12.3.0.

major changes in GCC 11 included:

- The default mode for C++ is now -std=gnu++17 instead of -std=gnu++14.
- When building GCC itself, the host compiler must now support C++11,
  rather than C++98.
- Some short options of the gcov tool have been renamed: -i to -j and
  -j to -H.
- ThreadSanitizer improvements.
- Introduce Hardware-assisted AddressSanitizer support.
- For targets that produce DWARF debugging information GCC now defaults
  to DWARF version 5. This can produce up to 25% more compact debug
  information compared to earlier versions.
- Many optimisations.
- The existing malloc attribute has been extended so that it can be
  used to identify allocator/deallocator API pairs. A pair of new
  -Wmismatched-dealloc and -Wmismatched-new-delete warnings are added.
- Other new warnings:
  -Wsizeof-array-div, enabled by -Wall, warns about divisions of two
    sizeof operators when the first one is applied to an array and the
    divisor does not equal the size of the array element.
  -Wstringop-overread, enabled by default, warns about calls to string
    functions reading past the end of the arrays passed to them as
    arguments.
  -Wtsan, enabled by default, warns about unsupported features in
    ThreadSanitizer (currently std::atomic_thread_fence).
- Enchanced warnings:
  -Wfree-nonheap-object detects many more instances of calls to
    deallocation functions with pointers not returned from a dynamic
    memory allocation function.
  -Wmaybe-uninitialized diagnoses passing pointers or references to
    uninitialized memory to functions taking const-qualified arguments.
  -Wuninitialized detects reads from uninitialized dynamically
    allocated memory.
  -Warray-parameter warns about functions with inconsistent array forms.
  -Wvla-parameter warns about functions with inconsistent VLA forms.
- Several new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++20 features have been implemented.
- The C++ front end has experimental support for some of the upcoming
  C++23 draft.
- Several new C++ warnings.
- Enhanced Arm, AArch64, x86, and RISC-V CPU support.
- The implementation of how program state is tracked within
  -fanalyzer has been completely rewritten with many enhancements.

see https://gcc.gnu.org/gcc-11/changes.html for a full list.

major changes in GCC 12 include:

- An ABI incompatibility between C and C++ when passing or returning
  by value certain aggregates containing zero width bit-fields has
  been discovered on various targets. x86-64, ARM and AArch64
  will always ignore them (so there is a C ABI incompatibility
  between GCC 11 and earlier with GCC 12 or later), PowerPC64 ELFv2
  always take them into account (so there is a C++ ABI
  incompatibility, GCC 4.4 and earlier compatible with GCC 12 or
  later, incompatible with GCC 4.5 through GCC 11). RISC-V has
  changed the handling of these already starting with GCC 10. As
  the ABI requires, MIPS takes them into account handling function
  return values so there is a C++ ABI incompatibility with GCC 4.5
  through 11.
- STABS: Support for emitting the STABS debugging format is
  deprecated and will be removed in the next release. All ports now
  default to emit DWARF (version 2 or later) debugging info or are
  obsoleted.
- Vectorization is enabled at -O2 which is now equivalent to the
  original -O2 -ftree-vectorize -fvect-cost-model=very-cheap.
- GCC now supports the ShadowCallStack sanitizer.
- Support for __builtin_shufflevector compatible with the clang
  language extension was added.
- Support for attribute unavailable was added.
- Support for __builtin_dynamic_object_size compatible with the
  clang language extension was added.
- New warnings:
  -Wbidi-chars warns about potentially misleading UTF-8
    bidirectional control characters.
  -Warray-compare warns about comparisons between two operands of
    array type.
- Some new features from the upcoming C2X revision of the ISO C
  standard are supported with -std=c2x and -std=gnu2x.
- Several C++23 features have been implemented.
- Many C++ enhancements across warnings and -f options.

see https://gcc.gnu.org/gcc-12/changes.html for a full list.
@
text
@d18 1
a18 1
    SANITIZER_NETBSD || SANITIZER_SOLARIS
d20 8
a27 9
#  include "asan_allocator.h"
#  include "asan_interceptors.h"
#  include "asan_internal.h"
#  include "asan_stack.h"
#  include "lsan/lsan_common.h"
#  include "sanitizer_common/sanitizer_allocator_checks.h"
#  include "sanitizer_common/sanitizer_allocator_dlsym.h"
#  include "sanitizer_common/sanitizer_errno.h"
#  include "sanitizer_common/sanitizer_tls_get_addr.h"
d32 29
a60 8
struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
  static bool UseImpl() { return asan_init_is_running; }
  static void OnAllocate(const void *ptr, uptr size) {
#  if CAN_SANITIZE_LEAKS
    // Suppress leaks from dlerror(). Previously dlsym hack on global array was
    // used by leak sanitizer as a root region.
    __lsan_register_root_region(ptr, size);
#  endif
d62 55
a116 4
  static void OnFree(const void *ptr, uptr size) {
#  if CAN_SANITIZE_LEAKS
    __lsan_unregister_root_region(ptr, size);
#  endif
d118 3
a120 1
};
a122 2
  if (DlsymAlloc::PointerIsMine(ptr))
    return DlsymAlloc::Free(ptr);
d124 4
a132 2
  if (DlsymAlloc::PointerIsMine(ptr))
    return DlsymAlloc::Free(ptr);
d134 2
d141 3
a143 2
  if (DlsymAlloc::Use())
    return DlsymAlloc::Allocate(size);
d150 3
a152 2
  if (DlsymAlloc::Use())
    return DlsymAlloc::Callocate(nmemb, size);
d159 4
a162 2
  if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr))
    return DlsymAlloc::Realloc(ptr, size);
d224 2
@


1.1.1.4
log
@initial import of GCC 14.3.0.

major changes in GCC 13:
- improved sanitizer
- zstd debug info compression
- LTO improvements
- SARIF based diagnostic support
- new warnings: -Wxor-used-as-pow, -Wenum-int-mismatch, -Wself-move,
  -Wdangling-reference
- many new -Wanalyzer* specific warnings
- enhanced warnings: -Wpessimizing-move, -Wredundant-move
- new attributes to mark file descriptors, c++23 "assume"
- several C23 features added
- several C++23 features added
- many new features for Arm, x86, RISC-V

major changes in GCC 14:
- more strict C99 or newer support
- ia64* marked deprecated (but seemingly still in GCC 15.)
- several new hardening features
- support for "hardbool", which can have user supplied values of true/false
- explicit support for stack scrubbing upon function exit
- better auto-vectorisation support
- added clang-compatible __has_feature and __has_extension
- more C23, including -std=c23
- several C++26 features added
- better diagnostics in C++ templates
- new warnings: -Wnrvo, Welaborated-enum-base
- many new features for Arm, x86, RISC-V
- possible ABI breaking change for SPARC64 and small structures with arrays
  of floats.
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@d34 1
a34 1
  static bool UseImpl() { return AsanInitIsRunning(); }
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