thodg/libgit2/tests/trace/windows/stacktrace.c

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  Commit

• 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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• tests/trace/windows/stacktrace.c

• #include "clar_libgit2.h"
  #include "win32/w32_stack.h"
  #include "win32/w32_crtdbg_stacktrace.h"
  
  #if defined(GIT_MSVC_CRTDBG)
  static void a(void)
  {
  	char buf[10000];
  
  	cl_assert(git_win32__stack(buf, sizeof(buf), 0, NULL, NULL) == 0);
  
  #if 0
  	fprintf(stderr, "Stacktrace from [%s:%d]:\n%s\n", __FILE__, __LINE__, buf);
  #endif
  }
  
  static void b(void)
  {
  	a();
  }
  
  static void c(void)
  {
  	b();
  }
  #endif
  
  void test_trace_windows_stacktrace__basic(void)
  {
  #if defined(GIT_MSVC_CRTDBG)
  	c();
  #endif
  }
  
  
  void test_trace_windows_stacktrace__leaks(void)
  {
  #if defined(GIT_MSVC_CRTDBG)
  	void * p1;
  	void * p2;
  	void * p3;
  	void * p4;
  	int before, after;
  	int leaks;
  	int error;
  
  	/* remember outstanding leaks due to set setup
  	 * and set mark/checkpoint.
  	 */
  	before = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_TOTAL |
  		GIT_WIN32__CRTDBG_STACKTRACE__SET_MARK,
  		NULL);
  
  	p1 = git__malloc(5);
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"p1");
  	cl_assert((leaks == 1));
  
  	p2 = git__malloc(5);
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"p1,p2");
  	cl_assert((leaks == 2));
  
  	p3 = git__malloc(5);
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"p1,p2,p3");
  	cl_assert((leaks == 3));
  
  	git__free(p2);
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"p1,p3");
  	cl_assert((leaks == 2));
  
  	/* move the mark. only new leaks should appear afterwards */
  	error = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__SET_MARK,
  		NULL);
  	cl_assert((error == 0));
  
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"not_p1,not_p3");
  	cl_assert((leaks == 0));
  
  	p4 = git__malloc(5);
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"p4,not_p1,not_p3");
  	cl_assert((leaks == 1));
  
  	git__free(p1);
  	git__free(p3);
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"p4");
  	cl_assert((leaks == 1));
  
  	git__free(p4);
  	leaks = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
  		"end");
  	cl_assert((leaks == 0));
  
  	/* confirm current absolute leaks count matches beginning value. */
  	after = git_win32__crtdbg_stacktrace__dump(
  		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
  		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_TOTAL,
  		"total");
  	cl_assert((before == after));
  #endif
  }
  
  #if defined(GIT_MSVC_CRTDBG)
  static void aux_cb_alloc__1(unsigned int *aux_id)
  {
  	static unsigned int aux_counter = 0;
  
  	*aux_id = aux_counter++;
  }
  
  static void aux_cb_lookup__1(unsigned int aux_id, char *aux_msg, unsigned int aux_msg_len)
  {
  	p_snprintf(aux_msg, aux_msg_len, "\tQQ%08x\n", aux_id);
  }
  
  #endif
  
  void test_trace_windows_stacktrace__aux1(void)
  {
  #if defined(GIT_MSVC_CRTDBG)
  	git_win32__stack__set_aux_cb(aux_cb_alloc__1, aux_cb_lookup__1);
  	c();
  	c();
  	c();
  	c();
  	git_win32__stack__set_aux_cb(NULL, NULL);
  #endif
  }
  

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