X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/ecfe3bffa6cc019ba7e358dbe359f10e5ce6a09d..447bcc499daf79752fae30c5a8d70b8cdffa7c87:/mem/track.h

diff --git a/mem/track.h b/mem/track.h
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-/* -*-c-*-
- *
- * Tracing functions for debugging
- *
- * (c) 1998 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of the mLib utilities library.
- *
- * mLib is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * mLib is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with mLib; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-#ifndef MLIB_TRACK_H
-#define MLIB_TRACK_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-#include <stdlib.h>
-
-/*----- Options and conventions -------------------------------------------*
- *
- * The following macros affect the tracking system:
- *
- * @TRACK_ENABLE@:	Enable tracking of memory allocations
- * @TRACK_BLAME@:	Register my context blocks in allocations
- *
- * The reason there are two switches is simple.  It's often the case that a
- * library routine allocates memory for its client.  Therefore, whether we
- * want to record the library or the client depends on how much we trust
- * the two pieces of software.  Setting @TRACK_ENABLE@ and @TRACK_BLAME@
- * suggests that the current source file might leak memory, so we want its
- * context markers in the list.  Setting @TRACK_ENABLE@ but not
- * @TRACK_BLAME@ suggests that we trust this code, but not the code which
- * calls it, so we want to preserve the caller's context markers.
- *
- * Got it?  Good.
- */
-
-/*----- Type definitions --------------------------------------------------*/
-
-/* --- A context buffer --- */
-
-typedef struct track_ctx {
-  struct track_ctx *next;
-  const char *s;
-} track_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @track_level@ --- *
- *
- * Arguments:	@unsigned int l@ = tracing level for allocation messages
- *
- * Returns:	---
- *
- * Use:		Sets the trace level for allocation messages.
- */
-
-extern void track_level(unsigned int /*l*/);
-
-/* --- @track_push@ --- *
- *
- * Arguments:	@track_ctx *ctx@ = context holder to push
- *
- * Returns:	---
- *
- * Use:		Pushes the given context block onto the stack.
- */
-
-extern void track_push(track_ctx */*ctx*/);
-
-/* --- @track_pop@ --- *
- *
- * Arguments:	@track_ctx *ctx@ = context holder to pop
- *
- * Returns:	---
- *
- * Use:		Removes the given context block from the stack.
- */
-
-extern void track_pop(track_ctx */*ctx*/);
-
-/* --- @track_malloc@ --- *
- *
- * Arguments:	@size_t sz@ = size requested
- *
- * Returns:	Pointer to allocated space, or null
- *
- * Use:		Allocates memory, and tracks how much is allocated.
- */
-
-extern void *track_malloc(size_t /*sz*/);
-
-/* --- @track_free@ --- *
- *
- * Arguments:	@void *p@ = pointer to an allocated block
- *
- * Returns:	---
- *
- * Use:		Frees memory, and tracks how much is still allocated.
- */
-
-extern void track_free(void */*p*/);
-
-/* --- @track_realloc@ --- *
- *
- * Arguments:	@void *p@ = pointer to an allocated block
- *		@size_t sz@ = how big it wants to be
- *
- * Returns:	Pointer to the new block.
- *
- * Use:		Reallocates a block, tracking how much memory is still
- *		available.
- */
-
-extern void *track_realloc(void */*p*/, size_t /*sz*/);
-
-/* --- @track_used@ --- *
- *
- * Arguments:	---
- *
- * Returns:	A count of how much memory is used currently.
- *
- * Use:		Returns the amount of memory which the @track_@-functions
- *		above have counted as being currently allocated.
- */
-
-extern unsigned long track_used(void);
-
-/* --- @track_list@ --- *
- *
- * Arguments:	@unsigned int l@ = trace level to use
- *
- * Returns:	---
- *
- * Use:		Traces a dump of the currently known blocks.  Combined with
- *		a verbose dump of allocations and deallocations, and a
- *		good idea of which blocks were allocated where, this can
- *		be useful for locating memory leaks.  It's not exactly a
- *		picnic, though.
- */
-
-extern void track_list(unsigned int l);
-
-/*----- Macro wrappers ----------------------------------------------------*/
-
-/* --- If tracking is to be done, set it up --- */
-
-#ifdef TRACK_ENABLE
-#  undef malloc
-#  define malloc(sz) track_malloc(sz)
-#  undef free
-#  define free(p) track_free(p)
-#  undef realloc
-#  define realloc(p, sz) track_realloc(p, sz)
-#endif
-
-/* --- Provide a context for doing track-related things --- */
-
-#ifdef TRACK_ENABLE
-#  define TRACK(x) x
-#else
-#  define TRACK(x)
-#endif
-
-/* --- Handle contexts --- */
-
-#if defined(TRACK_ENABLE) && defined(TRACK_BLAME)
-#  define TRACK_NCTX(name, string) track_ctx name = { 0, string }
-#  define TRACK_NPUSH(name) track_push(name)
-#  define TRACK_NPOP(name) track_pop(name)
-#  define TRACK_CTX(string) TRACK_NCTX(__track_ctx, string)
-#  define TRACK_PUSH TRACK_NPUSH(__track_ctx)
-#  define TRACK_POP TRACK_NPOP(__track_ctx)
-#else
-#  define TRACK_NCTX(name, string)
-#  define TRACK_NPUSH(name) ((void)0)
-#  define TRACK_NPOP(name) ((void)0)
-#  define TRACK_CTX(string)
-#  define TRACK_PUSH ((void)0)
-#  define TRACK_POP ((void)0)
-#endif
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif