src/libc_override_gcc_and_weak.h

// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// ---
// Author: Craig Silverstein <opensource@google.com>
//
// Used to override malloc routines on systems that define the
// memory allocation routines to be weak symbols in their libc
// (almost all unix-based systems are like this), on gcc, which
// suppports the 'alias' attribute.

#ifndef TCMALLOC_LIBC_OVERRIDE_GCC_AND_WEAK_INL_H_
#define TCMALLOC_LIBC_OVERRIDE_GCC_AND_WEAK_INL_H_

#ifdef HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>    // for __THROW
#endif
#include <gperftools/tcmalloc.h>

#ifndef __THROW    // I guess we're not on a glibc-like system
# define __THROW   // __THROW is just an optimization, so ok to make it ""
#endif

#ifndef __GNUC__
# error libc_override_gcc_and_weak.h is for gcc distributions only.
#endif

#define ALIAS(tc_fn)   __attribute__ ((alias (#tc_fn)))

void* operator new(size_t size) throw (std::bad_alloc)
    ALIAS(tc_new);
void operator delete(void* p) __THROW
    ALIAS(tc_delete);
void* operator new[](size_t size) throw (std::bad_alloc)
    ALIAS(tc_newarray);
void operator delete[](void* p) __THROW
    ALIAS(tc_deletearray);
void* operator new(size_t size, const std::nothrow_t& nt) __THROW
    ALIAS(tc_new_nothrow);
void* operator new[](size_t size, const std::nothrow_t& nt) __THROW
    ALIAS(tc_newarray_nothrow);
void operator delete(void* p, const std::nothrow_t& nt) __THROW
    ALIAS(tc_delete_nothrow);
void operator delete[](void* p, const std::nothrow_t& nt) __THROW
    ALIAS(tc_deletearray_nothrow);

extern "C" {
  void* malloc(size_t size) __THROW               ALIAS(tc_malloc);
  void free(void* ptr) __THROW                    ALIAS(tc_free);
  void* realloc(void* ptr, size_t size) __THROW   ALIAS(tc_realloc);
  void* calloc(size_t n, size_t size) __THROW     ALIAS(tc_calloc);
  void cfree(void* ptr) __THROW                   ALIAS(tc_cfree);
  void* memalign(size_t align, size_t s) __THROW  ALIAS(tc_memalign);
  void* valloc(size_t size) __THROW               ALIAS(tc_valloc);
  void* pvalloc(size_t size) __THROW              ALIAS(tc_pvalloc);
  int posix_memalign(void** r, size_t a, size_t s) __THROW
      ALIAS(tc_posix_memalign);
#ifndef __UCLIBC__
  void malloc_stats(void) __THROW                 ALIAS(tc_malloc_stats);
#endif
  int mallopt(int cmd, int value) __THROW         ALIAS(tc_mallopt);
#ifdef HAVE_STRUCT_MALLINFO
  struct mallinfo mallinfo(void) __THROW          ALIAS(tc_mallinfo);
#endif
  size_t malloc_size(void* p) __THROW             ALIAS(tc_malloc_size);
#if defined(__ANDROID__)
  size_t malloc_usable_size(const void* p) __THROW
         ALIAS(tc_malloc_size);
#else
  size_t malloc_usable_size(void* p) __THROW      ALIAS(tc_malloc_size);
#endif
}   // extern "C"

#undef ALIAS

// No need to do anything at tcmalloc-registration time: we do it all
// via overriding weak symbols (at link time).
static void ReplaceSystemAlloc() { }

#endif  // TCMALLOC_LIBC_OVERRIDE_GCC_AND_WEAK_INL_H_