Revert 126020 - Experiment for updating the tcmalloc chromium branch to r144 (gperftools 2.0).

third_party/tcmalloc/chromium/src/malloc_hook_mmap_freebsd.h

-// Copyright (c) 2011, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Override mmap/munmap/mremap/sbrk to provide support for calling the
-// related hooks (in addition, of course, to doing what these
-// functions normally do).
-
-#ifndef __FreeBSD__
-# error Should only be including malloc_hook_mmap_freebsd.h on FreeBSD systems.
-#endif
-
-#include <unistd.h>
-#include <sys/syscall.h>
-#include <sys/mman.h>
-#include <errno.h>
-
-// Make sure mmap doesn't get #define'd away by <sys/mman.h>
-#undef mmap
-
-// According to the FreeBSD documentation, use syscall if you do not
-// need 64-bit alignment otherwise use __syscall. Indeed, syscall
-// doesn't work correctly in most situations on 64-bit. It's return
-// type is 'int' so for things like SYS_mmap, it actually truncates
-// the returned address to 32-bits.
-#if defined(__amd64__) || defined(__x86_64__)
-# define MALLOC_HOOK_SYSCALL __syscall
-#else
-# define MALLOC_HOOK_SYSCALL syscall
-#endif
-
-
-extern "C" {
-  void* mmap(void *start, size_t length,int prot, int flags,
-             int fd, off_t offset) __THROW
-    ATTRIBUTE_SECTION(malloc_hook);
-  int munmap(void* start, size_t length) __THROW
-    ATTRIBUTE_SECTION(malloc_hook);
-  void* sbrk(intptr_t increment) __THROW
-    ATTRIBUTE_SECTION(malloc_hook);
-}
-
-static inline void* do_mmap(void *start, size_t length,
-                            int prot, int flags,
-                            int fd, off_t offset) __THROW {
-  return (void *)MALLOC_HOOK_SYSCALL(SYS_mmap,
-                                     start, length, prot, flags, fd, offset);
-}
-
-static inline void* do_sbrk(intptr_t increment) {
-  void* curbrk = 0;
-
-#if defined(__x86_64__) || defined(__amd64__)
-# ifdef PIC
-  __asm__ __volatile__(
-      "movq .curbrk@GOTPCREL(%%rip), %%rdx;"
-      "movq (%%rdx), %%rax;"
-      "movq %%rax, %0;"
-      : "=r" (curbrk)
-      :: "%rdx", "%rax");
-# else
-  __asm__ __volatile__(
-      "movq .curbrk(%%rip), %%rax;"
-      "movq %%rax, %0;"
-      : "=r" (curbrk)
-      :: "%rax");
-# endif
-#else
-  __asm__ __volatile__(
-      "movl .curbrk, %%eax;"
-      "movl %%eax, %0;"
-      : "=r" (curbrk)
-      :: "%eax");
-#endif
-
-  if (increment == 0) {
-    return curbrk;
-  }
-
-  char* prevbrk = static_cast<char*>(curbrk);
-  void* newbrk = prevbrk + increment;
-
-  if (brk(newbrk) == -1) {
-    return reinterpret_cast<void*>(static_cast<intptr_t>(-1));
-  }
-
-  return prevbrk;
-}
-
-
-extern "C" void* mmap(void *start, size_t length, int prot, int flags,
-                      int fd, off_t offset) __THROW {
-  MallocHook::InvokePreMmapHook(start, length, prot, flags, fd, offset);
-  void *result;
-  if (!MallocHook::InvokeMmapReplacement(
-          start, length, prot, flags, fd, offset, &result)) {
-    result = do_mmap(start, length, prot, flags, fd,
-                       static_cast<size_t>(offset)); // avoid sign extension
-  }
-  MallocHook::InvokeMmapHook(result, start, length, prot, flags, fd, offset);
-  return result;
-}
-
-extern "C" int munmap(void* start, size_t length) __THROW {
-  MallocHook::InvokeMunmapHook(start, length);
-  int result;
-  if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
-    result = MALLOC_HOOK_SYSCALL(SYS_munmap, start, length);
-  }
-
-  return result;
-}
-
-extern "C" void* sbrk(intptr_t increment) __THROW {
-  MallocHook::InvokePreSbrkHook(increment);
-  void *result = do_sbrk(increment);
-  MallocHook::InvokeSbrkHook(result, increment);
-  return result;
-}
-
-/*static*/void* MallocHook::UnhookedMMap(void *start, size_t length, int prot,
-                                         int flags, int fd, off_t offset) {
-  void* result;
-  if (!MallocHook::InvokeMmapReplacement(
-          start, length, prot, flags, fd, offset, &result)) {
-    result = do_mmap(start, length, prot, flags, fd, offset);
-  }
-
-  return result;
-}
-
-/*static*/int MallocHook::UnhookedMUnmap(void *start, size_t length) {
-  int result;
-  if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
-    result = MALLOC_HOOK_SYSCALL(SYS_munmap, start, length);
-  }
-  return result;
-}
-
-#undef MALLOC_HOOK_SYSCALL