head	1.4;
access;
symbols
	perseant-exfatfs-base-20261102:1.4
	netbsd-11-1-RELEASE:1.3
	gcc-14-4-0:1.1.1.3
	netbsd-11-0-RELEASE:1.3
	netbsd-11-0-RC7:1.3
	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-14-3-0:1.1.1.3
	perseant-exfatfs-base-20250801:1.3
	netbsd-11:1.3.0.4
	netbsd-11-base:1.3
	gcc-12-5-0:1.1.1.2
	perseant-exfatfs-base-20240630:1.3
	gcc-12-4-0:1.1.1.2
	perseant-exfatfs:1.3.0.2
	perseant-exfatfs-base:1.3
	gcc-12-3-0:1.1.1.2
	gcc-10-5-0:1.1.1.1
	gcc-10-4-0:1.1.1.1
	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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1.3
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1.2
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1.1
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1.1.1.1
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1.1.1.2
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1.1.1.3
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desc
@@


1.4
log
@merge GCC 14.3.0.
@
text
@//=-- lsan_common_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 LeakSanitizer.
// Implementation of common leak checking functionality. Linux/NetBSD-specific
// code.
//
//===----------------------------------------------------------------------===//

#include "sanitizer_common/sanitizer_platform.h"
#include "lsan_common.h"

#if CAN_SANITIZE_LEAKS && (SANITIZER_LINUX || SANITIZER_NETBSD)
#include <link.h>

#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_flags.h"
#include "sanitizer_common/sanitizer_getauxval.h"
#include "sanitizer_common/sanitizer_linux.h"
#include "sanitizer_common/sanitizer_stackdepot.h"

namespace __lsan {

static const char kLinkerName[] = "ld";

static char linker_placeholder[sizeof(LoadedModule)] ALIGNED(64);
static LoadedModule *linker = nullptr;

static bool IsLinker(const LoadedModule& module) {
#if SANITIZER_USE_GETAUXVAL
  return module.base_address() == getauxval(AT_BASE);
#else
  return LibraryNameIs(module.full_name(), kLinkerName);
#endif  // SANITIZER_USE_GETAUXVAL
}

__attribute__((tls_model("initial-exec")))
THREADLOCAL int disable_counter;
bool DisabledInThisThread() { return disable_counter > 0; }
void DisableInThisThread() { disable_counter++; }
void EnableInThisThread() {
  if (disable_counter == 0) {
    DisableCounterUnderflow();
  }
  disable_counter--;
}

void InitializePlatformSpecificModules() {
  ListOfModules modules;
  modules.init();
  for (LoadedModule &module : modules) {
    if (!IsLinker(module))
      continue;
    if (linker == nullptr) {
      linker = reinterpret_cast<LoadedModule *>(linker_placeholder);
      *linker = module;
      module = LoadedModule();
    } else {
      VReport(1, "LeakSanitizer: Multiple modules match \"%s\". "
              "TLS and other allocations originating from linker might be "
              "falsely reported as leaks.\n", kLinkerName);
      linker->clear();
      linker = nullptr;
      return;
    }
  }
  if (linker == nullptr) {
    VReport(1, "LeakSanitizer: Dynamic linker not found. TLS and other "
               "allocations originating from linker might be falsely reported "
                "as leaks.\n");
  }
}

static int ProcessGlobalRegionsCallback(struct dl_phdr_info *info, size_t size,
                                        void *data) {
  Frontier *frontier = reinterpret_cast<Frontier *>(data);
  for (uptr j = 0; j < info->dlpi_phnum; j++) {
    const ElfW(Phdr) *phdr = &(info->dlpi_phdr[j]);
    // We're looking for .data and .bss sections, which reside in writeable,
    // loadable segments.
    if (!(phdr->p_flags & PF_W) || (phdr->p_type != PT_LOAD) ||
        (phdr->p_memsz == 0))
      continue;
    uptr begin = info->dlpi_addr + phdr->p_vaddr;
    uptr end = begin + phdr->p_memsz;
    ScanGlobalRange(begin, end, frontier);
  }
  return 0;
}

#if SANITIZER_ANDROID && __ANDROID_API__ < 21
extern "C" __attribute__((weak)) int dl_iterate_phdr(
    int (*)(struct dl_phdr_info *, size_t, void *), void *);
#endif

// Scans global variables for heap pointers.
void ProcessGlobalRegions(Frontier *frontier) {
  if (!flags()->use_globals) return;
  dl_iterate_phdr(ProcessGlobalRegionsCallback, frontier);
}

LoadedModule *GetLinker() { return linker; }

void ProcessPlatformSpecificAllocations(Frontier *frontier) {}

struct DoStopTheWorldParam {
  StopTheWorldCallback callback;
  void *argument;
};

// While calling Die() here is undefined behavior and can potentially
// cause race conditions, it isn't possible to intercept exit on linux,
// so we have no choice but to call Die() from the atexit handler.
void HandleLeaks() {
  if (common_flags()->exitcode) Die();
}

static int LockStuffAndStopTheWorldCallback(struct dl_phdr_info *info,
                                            size_t size, void *data) {
  ScopedStopTheWorldLock lock;
  DoStopTheWorldParam *param = reinterpret_cast<DoStopTheWorldParam *>(data);
  StopTheWorld(param->callback, param->argument);
  return 1;
}

// LSan calls dl_iterate_phdr() from the tracer task. This may deadlock: if one
// of the threads is frozen while holding the libdl lock, the tracer will hang
// in dl_iterate_phdr() forever.
// Luckily, (a) the lock is reentrant and (b) libc can't distinguish between the
// tracer task and the thread that spawned it. Thus, if we run the tracer task
// while holding the libdl lock in the parent thread, we can safely reenter it
// in the tracer. The solution is to run stoptheworld from a dl_iterate_phdr()
// callback in the parent thread.
void LockStuffAndStopTheWorld(StopTheWorldCallback callback,
                              CheckForLeaksParam *argument) {
  DoStopTheWorldParam param = {callback, argument};
  dl_iterate_phdr(LockStuffAndStopTheWorldCallback, &param);
}

} // namespace __lsan

#endif
@


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
@d125 1
a125 2
  LockThreadRegistry();
  LockAllocator();
a127 2
  UnlockAllocator();
  UnlockThreadRegistry();
@


1.3.2.1
log
@Sync with HEAD
@
text
@d125 2
a126 1
  ScopedStopTheWorldLock lock;
d129 2
@


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
@d96 5
d142 2
a143 1
void LockStuffAndStopTheWorld(StopTheWorldCallback callback, void *argument) {
@


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 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
@a95 5
#if SANITIZER_ANDROID && __ANDROID_API__ < 21
extern "C" __attribute__((weak)) int dl_iterate_phdr(
    int (*)(struct dl_phdr_info *, size_t, void *), void *);
#endif

d137 1
a137 2
void LockStuffAndStopTheWorld(StopTheWorldCallback callback,
                              CheckForLeaksParam *argument) {
@


1.1.1.3
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.
@
text
@d125 2
a126 1
  ScopedStopTheWorldLock lock;
d129 2
@