thodg/libgit2/src/alloc.c

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• Hash : 9865cd16
  Author :
  Date : 2018-03-20T14:23:49
  

  alloc: make memory allocators use function pointers
  
  Currently, our memory allocators are being redirected to the correct
  implementation at compile time by simply using macros. In order to make
  them swappable at runtime, this commit reshuffles that by instead making
  use of a global "git_allocator" structure, whose pointers are set up to
  reference the allocator functions. Like this, it becomes easy to swap
  out allocators by simply setting these function pointers.
  
  In order to initialize a "git_allocator", our provided allocators
  "stdalloc" and "crtdbg" both provide an init function. This is being
  called to initialize a passed in allocator struct and set up its members
  correctly.
  
  No support is yet included to enable users of libgit2 to switch out the
  memory allocator at a global level.
  

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• src/alloc.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "alloc.h"
  
  #if defined(GIT_MSVC_CRTDBG)
  # include "win32/w32_crtdbg_stacktrace.h"
  #else
  # include "stdalloc.h"
  #endif
  
  git_allocator git__allocator;
  
  int git_allocator_global_init(void)
  {
  #if defined(GIT_MSVC_CRTDBG)
  	return git_win32_crtdbg_init_allocator(&git__allocator);
  #else
  	return git_stdalloc_init_allocator(&git__allocator);
  #endif
  }
  
  int git_allocator_setup(git_allocator *allocator)
  {
  	memcpy(&git__allocator, allocator, sizeof(*allocator));
  	return 0;
  }
  
  #if !defined(GIT_MSVC_CRTDBG)
  int git_win32_crtdbg_init_allocator(git_allocator *allocator)
  {
  	GIT_UNUSED(allocator);
  	giterr_set(GIT_EINVALID, "crtdbg memory allocator not available");
  	return -1;
  }
  #endif
  

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