Moving BeefMem

BeefTools/BeefMem/gperftools/src/libc_override_glibc.h

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+// 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.
+
+// ---
+// Author: Craig Silverstein <opensource@google.com>
+//
+// Used to override malloc routines on systems that are using glibc.
+
+#ifndef TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_
+#define TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_
+
+#include <config.h>
+#include <features.h>     // for __GLIBC__
+#ifdef HAVE_SYS_CDEFS_H
+#include <sys/cdefs.h>    // for __THROW
+#endif
+#include <gperftools/tcmalloc.h>
+
+#ifndef __GLIBC__
+# error libc_override_glibc.h is for glibc distributions only.
+#endif
+
+// In glibc, the memory-allocation methods are weak symbols, so we can
+// just override them with our own.  If we're using gcc, we can use
+// __attribute__((alias)) to do the overriding easily (exception:
+// Mach-O, which doesn't support aliases).  Otherwise we have to use a
+// function call.
+#if !defined(__GNUC__) || defined(__MACH__)
+
+// This also defines ReplaceSystemAlloc().
+# include "libc_override_redefine.h"  // defines functions malloc()/etc
+
+#else  // #if !defined(__GNUC__) || defined(__MACH__)
+
+// If we get here, we're a gcc system, so do all the overriding we do
+// with gcc.  This does the overriding of all the 'normal' memory
+// allocation.  This also defines ReplaceSystemAlloc().
+# include "libc_override_gcc_and_weak.h"
+
+// We also have to do some glibc-specific overriding.  Some library
+// routines on RedHat 9 allocate memory using malloc() and free it
+// using __libc_free() (or vice-versa).  Since we provide our own
+// implementations of malloc/free, we need to make sure that the
+// __libc_XXX variants (defined as part of glibc) also point to the
+// same implementations.  Since it only matters for redhat, we
+// do it inside the gcc #ifdef, since redhat uses gcc.
+// TODO(csilvers): only do this if we detect we're an old enough glibc?
+
+#define ALIAS(tc_fn)   __attribute__ ((alias (#tc_fn)))
+extern "C" {
+  void* __libc_malloc(size_t size)                ALIAS(tc_malloc);
+  void __libc_free(void* ptr)                     ALIAS(tc_free);
+  void* __libc_realloc(void* ptr, size_t size)    ALIAS(tc_realloc);
+  void* __libc_calloc(size_t n, size_t size)      ALIAS(tc_calloc);
+  void __libc_cfree(void* ptr)                    ALIAS(tc_cfree);
+  void* __libc_memalign(size_t align, size_t s)   ALIAS(tc_memalign);
+  void* __libc_valloc(size_t size)                ALIAS(tc_valloc);
+  void* __libc_pvalloc(size_t size)               ALIAS(tc_pvalloc);
+  int __posix_memalign(void** r, size_t a, size_t s)  ALIAS(tc_posix_memalign);
+}   // extern "C"
+#undef ALIAS
+
+#endif  // #if defined(__GNUC__) && !defined(__MACH__)
+
+
+// We also have to hook libc malloc.  While our work with weak symbols
+// should make sure libc malloc is never called in most situations, it
+// can be worked around by shared libraries with the DEEPBIND
+// environment variable set.  The below hooks libc to call our malloc
+// routines even in that situation.  In other situations, this hook
+// should never be called.
+extern "C" {
+static void* glibc_override_malloc(size_t size, const void *caller) {
+  return tc_malloc(size);
+}
+static void* glibc_override_realloc(void *ptr, size_t size,
+                                    const void *caller) {
+  return tc_realloc(ptr, size);
+}
+static void glibc_override_free(void *ptr, const void *caller) {
+  tc_free(ptr);
+}
+static void* glibc_override_memalign(size_t align, size_t size,
+                                     const void *caller) {
+  return tc_memalign(align, size);
+}
+
+// We should be using __malloc_initialize_hook here, like the #if 0
+// code below.  (See http://swoolley.org/man.cgi/3/malloc_hook.)
+// However, this causes weird linker errors with programs that link
+// with -static, so instead we just assign the vars directly at
+// static-constructor time.  That should serve the same effect of
+// making sure the hooks are set before the first malloc call the
+// program makes.
+#if 0
+#include <malloc.h>  // for __malloc_hook, etc.
+void glibc_override_malloc_init_hook(void) {
+  __malloc_hook = glibc_override_malloc;
+  __realloc_hook = glibc_override_realloc;
+  __free_hook = glibc_override_free;
+  __memalign_hook = glibc_override_memalign;
+}
+
+void (* MALLOC_HOOK_MAYBE_VOLATILE __malloc_initialize_hook)(void)
+    = &glibc_override_malloc_init_hook;
+#endif
+
+void* (* MALLOC_HOOK_MAYBE_VOLATILE __malloc_hook)(size_t, const void*)
+    = &glibc_override_malloc;
+void* (* MALLOC_HOOK_MAYBE_VOLATILE __realloc_hook)(void*, size_t, const void*)
+    = &glibc_override_realloc;
+void (* MALLOC_HOOK_MAYBE_VOLATILE __free_hook)(void*, const void*)
+    = &glibc_override_free;
+void* (* MALLOC_HOOK_MAYBE_VOLATILE __memalign_hook)(size_t,size_t, const void*)
+    = &glibc_override_memalign;
+
+}   // extern "C"
+
+// No need to write ReplaceSystemAlloc(); one of the #includes above
+// did it for us.
+
+#endif  // TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_