thodg/libgit2/src/win32/w32_stack.h

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• Hash : 0c7f49dd
  Author :
  Date : 2017-06-30T13:39:01
  

  Make sure to always include "common.h" first Next to including several files, our "common.h" header also declares various macros which are then used throughout the project. As such, we have to make sure to always include this file first in all implementation files. Otherwise, we might encounter problems or even silent behavioural differences due to macros or defines not being defined as they should be. So in fact, our header and implementation files should make sure to always include "common.h" first. This commit does so by establishing a common include pattern. Header files inside of "src" will now always include "common.h" as its first other file, separated by a newline from all the other includes to make it stand out as special. There are two cases for the implementation files. If they do have a matching header file, they will always include this one first, leading to "common.h" being transitively included as first file. If they do not have a matching header file, they instead include "common.h" as first file themselves. This fixes the outlined problems and will become our standard practice for header and source files inside of the "src/" from now on.

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• src/win32/w32_stack.h

• /*
   * 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.
   */
  
  #ifndef INCLUDE_w32_stack_h__
  #define INCLUDE_w32_stack_h__
  
  #include "common.h"
  
  #if defined(GIT_MSVC_CRTDBG)
  
  /**
   * This type defines a callback to be used to augment a C stacktrace
   * with "aux" data. This can be used, for example, to allow LibGit2Sharp
   * (or other interpreted consumer libraries) to give us C# stacktrace
   * data for the PInvoke.
   *
   * This callback will be called during crtdbg-instrumented allocs.
   *
   * @param aux_id [out] A returned "aux_id" representing a unique
   * (de-duped at the C# layer) stacktrace.  "aux_id" 0 is reserved
   * to mean no aux stacktrace data.
   */
  typedef void (*git_win32__stack__aux_cb_alloc)(unsigned int *aux_id);
  
  /**
   * This type defines a callback to be used to augment the output of
   * a stacktrace.  This will be used to request the C# layer format
   * the C# stacktrace associated with "aux_id" into the provided
   * buffer.
   *
   * This callback will be called during leak reporting.
   *
   * @param aux_id The "aux_id" key associated with a stacktrace.
   * @param aux_msg A buffer where a formatted message should be written.
   * @param aux_msg_len The size of the buffer.
   */
  typedef void (*git_win32__stack__aux_cb_lookup)(unsigned int aux_id, char *aux_msg, unsigned int aux_msg_len);
  
  /**
   * Register an "aux" data provider to augment our C stacktrace data.
   *
   * This can be used, for example, to allow LibGit2Sharp (or other
   * interpreted consumer libraries) to give us the C# stacktrace of
   * the PInvoke.
   *
   * If you choose to use this feature, it should be registered during
   * initialization and not changed for the duration of the process.
   */
  GIT_EXTERN(int) git_win32__stack__set_aux_cb(
  	git_win32__stack__aux_cb_alloc cb_alloc,
  	git_win32__stack__aux_cb_lookup cb_lookup);
  
  /**
   * Maximum number of stackframes to record for a
   * single stacktrace.
   */
  #define GIT_WIN32__STACK__MAX_FRAMES 30
  
  /**
   * Wrapper containing the raw unprocessed stackframe
   * data for a single stacktrace and any "aux_id".
   *
   * I put the aux_id first so leaks will be sorted by it.
   * So, for example, if a specific callstack in C# leaks
   * a repo handle, all of the pointers within the associated
   * repo pointer will be grouped together.
   */
  typedef struct {
  	unsigned int aux_id;
  	unsigned int nr_frames;
  	void *frames[GIT_WIN32__STACK__MAX_FRAMES];
  } git_win32__stack__raw_data;
  
  
  /**
   * Load symbol table data.  This should be done in the primary
   * thread at startup (under a lock if there are other threads
   * active).
   */
  void git_win32__stack_init(void);
  
  /**
   * Cleanup symbol table data.  This should be done in the
   * primary thead at shutdown (under a lock if there are other
   * threads active).
   */
  void git_win32__stack_cleanup(void);
  
  
  /**
   * Capture raw stack trace data for the current process/thread.
   *
   * @param skip Number of initial frames to skip.  Pass 0 to
   * begin with the caller of this routine. Pass 1 to begin
   * with its caller.  And so on.
   */
  int git_win32__stack_capture(git_win32__stack__raw_data *pdata, int skip);
  
  /**
   * Compare 2 raw stacktraces with the usual -1,0,+1 result.
   * This includes any "aux_id" values in the comparison, so that
   * our de-dup is also "aux" context relative.
   */
  int git_win32__stack_compare(
  	git_win32__stack__raw_data *d1,
  	git_win32__stack__raw_data *d2);
  
  /**
   * Format raw stacktrace data into buffer WITHOUT using any mallocs.
   *
   * @param prefix String written before each frame; defaults to "\t".
   * @param suffix String written after each frame; defaults to "\n".
   */
  int git_win32__stack_format(
  	char *pbuf, int buf_len,
  	const git_win32__stack__raw_data *pdata,
  	const char *prefix, const char *suffix);
  
  /**
   * Convenience routine to capture and format stacktrace into
   * a buffer WITHOUT using any mallocs.  This is primarily a
   * wrapper for testing.
   *
   * @param skip Number of initial frames to skip. Pass 0 to
   * begin with the caller of this routine.  Pass 1 to begin
   * with its caller.  And so on.
   * @param prefix String written before each frame; defaults to "\t".
   * @param suffix String written after each frame; defaults to "\n".
   */
  int git_win32__stack(
  	char * pbuf, int buf_len,
  	int skip,
  	const char *prefix, const char *suffix);
  
  #endif /* GIT_MSVC_CRTDBG */
  #endif /* INCLUDE_w32_stack_h__ */
  

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