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/* $Id$ */
/** @file
* IPRT - Memory Allocation, electric fence.
*/
/*
* Copyright (C) 2006-2022 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
#ifndef IPRT_INCLUDED_SRC_r3_alloc_ef_h
#define IPRT_INCLUDED_SRC_r3_alloc_ef_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
#if defined(DOXYGEN_RUNNING)
# define RTALLOC_USE_EFENCE
# define RTALLOC_EFENCE_IN_FRONT
# define RTALLOC_EFENCE_FREE_FILL 'f'
#endif
/** @def RTALLOC_USE_EFENCE
* If defined the electric fence put up for ALL allocations by RTMemAlloc(),
* RTMemAllocZ(), RTMemRealloc(), RTMemTmpAlloc() and RTMemTmpAllocZ().
*/
#if 0
# define RTALLOC_USE_EFENCE
#endif
/** @def RTALLOC_EFENCE_SIZE
* The size of the fence. This must be page aligned.
*/
#define RTALLOC_EFENCE_SIZE PAGE_SIZE
/** @def RTALLOC_EFENCE_ALIGNMENT
* The allocation alignment, power of two of course.
*
* Use this for working around misaligned sizes, usually stemming from
* allocating a string or something after the main structure. When you
* encounter this, please fix the allocation to RTMemAllocVar or RTMemAllocZVar.
*/
#if 0
# define RTALLOC_EFENCE_ALIGNMENT (ARCH_BITS / 8)
#else
# define RTALLOC_EFENCE_ALIGNMENT 1
#endif
/** @def RTALLOC_EFENCE_IN_FRONT
* Define this to put the fence up in front of the block.
* The default (when this isn't defined) is to up it up after the block.
*/
//# define RTALLOC_EFENCE_IN_FRONT
/** @def RTALLOC_EFENCE_TRACE
* Define this to support actual free and reallocation of blocks.
*/
#define RTALLOC_EFENCE_TRACE
/** @def RTALLOC_EFENCE_FREE_DELAYED
* This define will enable free() delay and protection of the freed data
* while it's being delayed. The value of RTALLOC_EFENCE_FREE_DELAYED defines
* the threshold of the delayed blocks.
* Delayed blocks does not consume any physical memory, only virtual address space.
* Requires RTALLOC_EFENCE_TRACE.
*/
#define RTALLOC_EFENCE_FREE_DELAYED (20 * _1M)
/** @def RTALLOC_EFENCE_FREE_FILL
* This define will enable memset(,RTALLOC_EFENCE_FREE_FILL,)'ing the user memory
* in the block before freeing/decommitting it. This is useful in GDB since GDB
* appears to be able to read the content of the page even after it's been
* decommitted.
* Requires RTALLOC_EFENCE_TRACE.
*/
#if defined(RT_OS_LINUX) || defined(RT_OS_SOLARIS) || defined(DOXYGEN_RUNNING)
# define RTALLOC_EFENCE_FREE_FILL 'f'
#endif
/** @def RTALLOC_EFENCE_FILLER
* This define will enable memset(,RTALLOC_EFENCE_FILLER,)'ing the allocated
* memory when the API doesn't require it to be zero'd.
*/
#define RTALLOC_EFENCE_FILLER 0xef
/** @def RTALLOC_EFENCE_NOMAN_FILLER
* This define will enable memset(,RTALLOC_EFENCE_NOMAN_FILLER,)'ing the
* unprotected but not allocated area of memory, the so called no man's land.
*/
#define RTALLOC_EFENCE_NOMAN_FILLER 0xaa
/** @def RTALLOC_EFENCE_FENCE_FILLER
* This define will enable memset(,RTALLOC_EFENCE_FENCE_FILLER,)'ing the
* fence itself, as debuggers can usually read them.
*/
#define RTALLOC_EFENCE_FENCE_FILLER 0xcc
#if defined(DOXYGEN_RUNNING)
/** @def RTALLOC_EFENCE_CPP
* This define will enable the new and delete wrappers.
*/
# define RTALLOC_EFENCE_CPP
#endif
#if defined(RUNNING_DOXYGEN)
/** @def RTALLOC_REPLACE_MALLOC
* Replaces the malloc, calloc, realloc, free and friends in libc (experimental).
* Set in LocalConfig.kmk. Requires RTALLOC_EFENCE_TRACE to work. */
# define RTALLOC_REPLACE_MALLOC
#endif
#if defined(RTALLOC_REPLACE_MALLOC) && !defined(RTALLOC_EFENCE_TRACE)
# error "RTALLOC_REPLACE_MALLOC requires RTALLOC_EFENCE_TRACE."
#endif
/*******************************************************************************
* Header Files *
*******************************************************************************/
#ifdef RT_OS_WINDOWS
# include <iprt/win/windows.h>
#else
# include <sys/mman.h>
#endif
#include <iprt/avl.h>
#include <iprt/thread.h>
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* Allocation types.
*/
typedef enum RTMEMTYPE
{
RTMEMTYPE_RTMEMALLOC,
RTMEMTYPE_RTMEMALLOCZ,
RTMEMTYPE_RTMEMREALLOC,
RTMEMTYPE_RTMEMFREE,
RTMEMTYPE_RTMEMFREEZ,
RTMEMTYPE_NEW,
RTMEMTYPE_NEW_ARRAY,
RTMEMTYPE_DELETE,
RTMEMTYPE_DELETE_ARRAY
} RTMEMTYPE;
#ifdef RTALLOC_EFENCE_TRACE
/**
* Node tracking a memory allocation.
*/
typedef struct RTMEMBLOCK
{
/** Avl node code, key is the user block pointer. */
AVLPVNODECORE Core;
/** Allocation type. */
RTMEMTYPE enmType;
/** The unaligned size of the block. */
size_t cbUnaligned;
/** The aligned size of the block. */
size_t cbAligned;
/** The allocation tag (read-only string). */
const char *pszTag;
/** The return address of the allocator function. */
void *pvCaller;
/** Line number of the alloc call. */
unsigned iLine;
/** File from within the allocation was made. */
const char *pszFile;
/** Function from within the allocation was made. */
const char *pszFunction;
} RTMEMBLOCK, *PRTMEMBLOCK;
#endif
/*******************************************************************************
* Internal Functions *
******************************************************************************/
RT_C_DECLS_BEGIN
RTDECL(void *) rtR3MemAlloc(const char *pszOp, RTMEMTYPE enmType, size_t cbUnaligned, size_t cbAligned,
const char *pszTag, void *pvCaller, RT_SRC_POS_DECL);
RTDECL(void *) rtR3MemRealloc(const char *pszOp, RTMEMTYPE enmType, void *pvOld, size_t cbNew,
const char *pszTag, void *pvCaller, RT_SRC_POS_DECL);
RTDECL(void) rtR3MemFree(const char *pszOp, RTMEMTYPE enmType, void *pv, size_t cbUser, void *pvCaller, RT_SRC_POS_DECL);
RT_C_DECLS_END
/*******************************************************************************
* Global Variables *
*******************************************************************************/
#ifdef RTALLOC_REPLACE_MALLOC
RT_C_DECLS_BEGIN
extern void * (*g_pfnOrgMalloc)(size_t);
extern void * (*g_pfnOrgCalloc)(size_t, size_t);
extern void * (*g_pfnOrgRealloc)(void *, size_t);
extern void (*g_pfnOrgFree)(void *);
RT_C_DECLS_END
#endif
#endif /* !IPRT_INCLUDED_SRC_r3_alloc_ef_h */
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