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memento.c
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/* Copyright (C) 2001-2023 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
CA 94129, USA, for further information.
*/
/* Inspired by Fortify by Simon P Bullen. */
/* Set the following if you're only looking for leaks, not memory overwrites
* to speed the operation */
/* #define MEMENTO_LEAKONLY */
/* Set the following to keep extra details about the history of blocks */
#define MEMENTO_DETAILS
/* Don't keep blocks around if they'd mean losing more than a quarter of
* the freelist. */
#define MEMENTO_FREELIST_MAX_SINGLE_BLOCK (MEMENTO_FREELIST_MAX/4)
#define COMPILING_MEMENTO_C
/* SHUT UP, MSVC. I KNOW WHAT I AM DOING. */
#define _CRT_SECURE_NO_WARNINGS
/* We have some GS specific tweaks; more for the GS build environment than
* anything else. */
/* #define MEMENTO_GS_HACKS */
#ifdef MEMENTO_GS_HACKS
/* For GS we include malloc_.h. Anyone else would just include memento.h */
#include "malloc_.h"
#include "memory_.h"
int atexit(void (*)(void));
#else
#include "memento.h"
#include <stdio.h>
#endif
#ifndef _MSC_VER
#include <stdint.h>
#include <limits.h>
#include <unistd.h>
#endif
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#ifdef __ANDROID__
#define MEMENTO_ANDROID
#include <stdio.h>
#endif
/* Hacks to portably print large sizes */
#ifdef _MSC_VER
#define FMTZ "%llu"
#define FMTZ_CAST _int64
#define FMTP "0x%p"
#else
#define FMTZ "%zu"
#define FMTZ_CAST size_t
#define FMTP "%p"
#endif
#define UB(x) ((intptr_t)((x) & 0xFF))
#define B2I(x) (UB(x) | (UB(x)<<8) | (UB(x)<<16) | (UB(x)<<24))
#define B2P(x) ((void *)(B2I(x) | ((B2I(x)<<16)<<16)))
#define MEMENTO_PREFILL_UBYTE ((unsigned char)(MEMENTO_PREFILL))
#define MEMENTO_PREFILL_USHORT (((unsigned short)MEMENTO_PREFILL_UBYTE) | (((unsigned short)MEMENTO_PREFILL_UBYTE)<<8))
#define MEMENTO_PREFILL_UINT (((unsigned int)MEMENTO_PREFILL_USHORT) | (((unsigned int)MEMENTO_PREFILL_USHORT)<<16))
#define MEMENTO_PREFILL_PTR (void *)(((uintptr_t)MEMENTO_PREFILL_UINT) | ((((uintptr_t)MEMENTO_PREFILL_UINT)<<16)<<16))
#define MEMENTO_POSTFILL_UBYTE ((unsigned char)(MEMENTO_POSTFILL))
#define MEMENTO_POSTFILL_USHORT (((unsigned short)MEMENTO_POSTFILL_UBYTE) | (((unsigned short)MEMENTO_POSTFILL_UBYTE)<<8))
#define MEMENTO_POSTFILL_UINT (((unsigned int)MEMENTO_POSTFILL_USHORT) | (((unsigned int)MEMENTO_POSTFILL_USHORT)<<16))
#define MEMENTO_POSTFILL_PTR (void *)(((uintptr_t)MEMENTO_POSTFILL_UINT) | ((((uintptr_t)MEMENTO_POSTFILL_UINT)<<16)<<16))
#define MEMENTO_ALLOCFILL_UBYTE ((unsigned char)(MEMENTO_ALLOCFILL))
#define MEMENTO_ALLOCFILL_USHORT (((unsigned short)MEMENTO_ALLOCFILL_UBYTE) | (((unsigned short)MEMENTO_ALLOCFILL_UBYTE)<<8))
#define MEMENTO_ALLOCFILL_UINT (((unsigned int)MEMENTO_ALLOCFILL_USHORT) | (((unsigned int)MEMENTO_ALLOCFILL_USHORT)<<16))
#define MEMENTO_ALLOCFILL_PTR (void *)(((uintptr_t)MEMENTO_ALLOCFILL_UINT) | ((((uintptr_t)MEMENTO_ALLOCFILL_UINT)<<16)<<16))
#define MEMENTO_FREEFILL_UBYTE ((unsigned char)(MEMENTO_FREEFILL))
#define MEMENTO_FREEFILL_USHORT (((unsigned short)MEMENTO_FREEFILL_UBYTE) | (((unsigned short)MEMENTO_FREEFILL_UBYTE)<<8))
#define MEMENTO_FREEFILL_UINT (((unsigned int)MEMENTO_FREEFILL_USHORT) | (((unsigned int)MEMENTO_FREEFILL_USHORT)<<16))
#define MEMENTO_FREEFILL_PTR (void *)(((uintptr_t)MEMENTO_FREEFILL_UINT) | ((((uintptr_t)MEMENTO_FREEFILL_UINT)<<16)<<16))
#ifdef MEMENTO
#ifndef MEMENTO_CPP_EXTRAS_ONLY
#ifdef MEMENTO_ANDROID
#include <android/log.h>
static char log_buffer[4096];
static int log_fill = 0;
static char log_buffer2[4096];
static int
android_fprintf(FILE *file, const char *fmt, ...)
{
va_list args;
char *p, *q;
va_start(args, fmt);
vsnprintf(log_buffer2, sizeof(log_buffer2)-1, fmt, args);
va_end(args);
/* Ensure we are always null terminated */
log_buffer2[sizeof(log_buffer2)-1] = 0;
p = log_buffer2;
q = p;
do
{
/* Find the end of the string, or the next \n */
while (*p && *p != '\n')
p++;
/* We need to output from q to p. Limit ourselves to what
* will fit in the existing */
if (p - q >= sizeof(log_buffer)-1 - log_fill)
p = q + sizeof(log_buffer)-1 - log_fill;
memcpy(&log_buffer[log_fill], q, p-q);
log_fill += p-q;
if (*p == '\n')
{
log_buffer[log_fill] = 0;
__android_log_print(ANDROID_LOG_ERROR, "memento", "%s", log_buffer);
usleep(1);
log_fill = 0;
p++; /* Skip over the \n */
}
else if (log_fill >= sizeof(log_buffer)-1)
{
log_buffer[sizeof(log_buffer2)-1] = 0;
__android_log_print(ANDROID_LOG_ERROR, "memento", "%s", log_buffer);
usleep(1);
log_fill = 0;
}
q = p;
}
while (*p);
return 0;
}
#define fprintf android_fprintf
#define MEMENTO_STACKTRACE_METHOD 3
#endif
/* _WIN64 defined implies _WIN32 will be */
#ifdef _WIN32
#include <windows.h>
static int
windows_fprintf(FILE *file, const char *fmt, ...)
{
va_list args;
char text[4096];
int ret;
va_start(args, fmt);
ret = vfprintf(file, fmt, args);
va_end(args);
va_start(args, fmt);
vsnprintf(text, 4096, fmt, args);
OutputDebugStringA(text);
va_end(args);
return ret;
}
#define fprintf windows_fprintf
#endif
#ifndef MEMENTO_STACKTRACE_METHOD
#ifdef __GNUC__
#define MEMENTO_STACKTRACE_METHOD 1
#endif
#ifdef _WIN32
#define MEMENTO_STACKTRACE_METHOD 2
#endif
#endif
#if defined(__linux__)
#define MEMENTO_HAS_FORK
#elif defined(__APPLE__) && defined(__MACH__)
#define MEMENTO_HAS_FORK
#endif
/* Define the underlying allocators, just in case */
void *MEMENTO_UNDERLYING_MALLOC(size_t);
void MEMENTO_UNDERLYING_FREE(void *);
void *MEMENTO_UNDERLYING_REALLOC(void *,size_t);
void *MEMENTO_UNDERLYING_CALLOC(size_t,size_t);
/* And some other standard functions we use. We don't include the header
* files, just in case they pull in unexpected others. */
int atoi(const char *);
char *getenv(const char *);
/* How far to search for pointers in each block when calculating nestings */
/* mupdf needs at least 34000ish (sizeof(fz_shade))/ */
#define MEMENTO_PTRSEARCH 65536
#ifndef MEMENTO_MAXPATTERN
#define MEMENTO_MAXPATTERN 0
#endif
#ifdef MEMENTO_GS_HACKS
#include "valgrind.h"
#else
#ifdef HAVE_VALGRIND
#include "valgrind/memcheck.h"
#else
#define VALGRIND_MAKE_MEM_NOACCESS(p,s) do { } while (0==1)
#define VALGRIND_MAKE_MEM_UNDEFINED(p,s) do { } while (0==1)
#define VALGRIND_MAKE_MEM_DEFINED(p,s) do { } while (0==1)
#endif
#endif
enum {
Memento_PreSize = 16,
Memento_PostSize = 16
};
/* Some compile time checks */
typedef struct
{
char MEMENTO_PRESIZE_MUST_BE_A_MULTIPLE_OF_4[Memento_PreSize & 3 ? -1 : 1];
char MEMENTO_POSTSIZE_MUST_BE_A_MULTIPLE_OF_4[Memento_PostSize & 3 ? -1 : 1];
char MEMENTO_POSTSIZE_MUST_BE_AT_LEAST_4[Memento_PostSize >= 4 ? 1 : -1];
char MEMENTO_PRESIZE_MUST_BE_AT_LEAST_4[Memento_PreSize >= 4 ? 1 : -1];
} MEMENTO_SANITY_CHECK_STRUCT;
#define MEMENTO_UINT32 unsigned int
#define MEMENTO_UINT16 unsigned short
#define MEMENTO_PREFILL_UINT32 ((MEMENTO_UINT32)(MEMENTO_PREFILL | (MEMENTO_PREFILL <<8) | (MEMENTO_PREFILL <<16) |(MEMENTO_PREFILL <<24)))
#define MEMENTO_POSTFILL_UINT16 ((MEMENTO_UINT16)(MEMENTO_POSTFILL | (MEMENTO_POSTFILL<<8)))
#define MEMENTO_POSTFILL_UINT32 ((MEMENTO_UINT32)(MEMENTO_POSTFILL | (MEMENTO_POSTFILL<<8) | (MEMENTO_POSTFILL<<16) |(MEMENTO_POSTFILL<<24)))
#define MEMENTO_FREEFILL_UINT16 ((MEMENTO_UINT16)(MEMENTO_FREEFILL | (MEMENTO_FREEFILL<<8)))
#define MEMENTO_FREEFILL_UINT32 ((MEMENTO_UINT32)(MEMENTO_FREEFILL | (MEMENTO_FREEFILL<<8) | (MEMENTO_FREEFILL<<16) |(MEMENTO_FREEFILL<<24)))
enum {
Memento_Flag_OldBlock = 1,
Memento_Flag_HasParent = 2,
Memento_Flag_BreakOnFree = 4,
Memento_Flag_BreakOnRealloc = 8,
Memento_Flag_Freed = 16,
Memento_Flag_KnownLeak = 32,
Memento_Flag_Reported = 64
};
enum {
Memento_EventType_malloc = 0,
Memento_EventType_calloc = 1,
Memento_EventType_realloc = 2,
Memento_EventType_free = 3,
Memento_EventType_new = 4,
Memento_EventType_delete = 5,
Memento_EventType_newArray = 6,
Memento_EventType_deleteArray = 7,
Memento_EventType_takeRef = 8,
Memento_EventType_dropRef = 9,
Memento_EventType_reference = 10
};
static const char *eventType[] =
{
"malloc",
"calloc",
"realloc",
"free",
"new",
"delete",
"new[]",
"delete[]",
"takeRef",
"dropRef",
"reference"
};
/* When we list leaked blocks at the end of execution, we search for pointers
* between blocks in order to be able to give a nice nested view.
* Unfortunately, if you have are running your own allocator (such as
* postscript's chunk allocator) you can often find that the header of the
* block always contains pointers to next or previous blocks. This tends to
* mean the nesting displayed is "uninteresting" at best :)
*
* As a hack to get around this, we have a define MEMENTO_SKIP_SEARCH that
* indicates how many bytes to skip over at the start of the chunk.
* This may cause us to miss true nestings, but such is life...
*/
#ifndef MEMENTO_SEARCH_SKIP
#ifdef MEMENTO_GS_HACKS
#define MEMENTO_SEARCH_SKIP (2*sizeof(void *))
#else
#define MEMENTO_SEARCH_SKIP 0
#endif
#endif
#define MEMENTO_CHILD_MAGIC ((Memento_BlkHeader *)('M' | ('3' << 8) | ('m' << 16) | ('3' << 24)))
#define MEMENTO_SIBLING_MAGIC ((Memento_BlkHeader *)('n' | ('t' << 8) | ('0' << 16) | ('!' << 24)))
#ifdef MEMENTO_DETAILS
typedef struct Memento_BlkDetails Memento_BlkDetails;
struct Memento_BlkDetails
{
Memento_BlkDetails *next;
char type;
char count;
int sequence;
void *stack[1];
};
#endif /* MEMENTO_DETAILS */
typedef struct Memento_BlkHeader Memento_BlkHeader;
struct Memento_BlkHeader
{
size_t rawsize;
int sequence;
int lastCheckedOK;
int flags;
Memento_BlkHeader *next;
Memento_BlkHeader *prev; /* Reused as 'parent' when printing nested list */
const char *label;
/* Entries for nesting display calculations. Set to magic
* values at all other time. */
Memento_BlkHeader *child;
Memento_BlkHeader *sibling;
#ifdef MEMENTO_DETAILS
Memento_BlkDetails *details;
Memento_BlkDetails **details_tail;
#endif
char preblk[Memento_PreSize];
};
/* In future this could (should) be a smarter data structure, like, say,
* splay trees. For now, we use a list.
*/
typedef struct Memento_Blocks
{
Memento_BlkHeader *head;
Memento_BlkHeader *tail;
} Memento_Blocks;
/* What sort of Mutex should we use? */
#ifdef MEMENTO_LOCKLESS
typedef int Memento_mutex;
static void Memento_initMutex(Memento_mutex *m)
{
(void)m;
}
#define MEMENTO_DO_LOCK() do { } while (0)
#define MEMENTO_DO_UNLOCK() do { } while (0)
#else
#if defined(_WIN32) || defined(_WIN64)
/* Windows */
typedef CRITICAL_SECTION Memento_mutex;
static void Memento_initMutex(Memento_mutex *m)
{
InitializeCriticalSection(m);
}
#define MEMENTO_DO_LOCK() \
EnterCriticalSection(&memento.mutex)
#define MEMENTO_DO_UNLOCK() \
LeaveCriticalSection(&memento.mutex)
#else
#include <pthread.h>
typedef pthread_mutex_t Memento_mutex;
static void Memento_initMutex(Memento_mutex *m)
{
pthread_mutex_init(m, NULL);
}
#define MEMENTO_DO_LOCK() \
pthread_mutex_lock(&memento.mutex)
#define MEMENTO_DO_UNLOCK() \
pthread_mutex_unlock(&memento.mutex)
#endif
#endif
/* And our global structure */
static struct {
int inited;
Memento_Blocks used;
Memento_Blocks free;
size_t freeListSize;
int sequence;
int paranoia;
int paranoidAt;
int countdown;
int lastChecked;
int breakAt;
int failAt;
int failing;
int nextFailAt;
int squeezeAt;
int squeezing;
int segv;
int pattern;
int nextPattern;
int patternBit;
int leaking;
size_t maxMemory;
size_t alloc;
size_t peakAlloc;
size_t totalAlloc;
size_t numMallocs;
size_t numFrees;
size_t numReallocs;
Memento_mutex mutex;
} memento;
#define MEMENTO_EXTRASIZE (sizeof(Memento_BlkHeader) + Memento_PostSize)
/* Round up size S to the next multiple of N (where N is a power of 2) */
#define MEMENTO_ROUNDUP(S,N) ((S + N-1)&~(N-1))
#define MEMBLK_SIZE(s) MEMENTO_ROUNDUP(s + MEMENTO_EXTRASIZE, MEMENTO_MAXALIGN)
#define MEMBLK_FROMBLK(B) (&((Memento_BlkHeader*)(void *)(B))[-1])
#define MEMBLK_TOBLK(B) ((void*)(&((Memento_BlkHeader*)(void*)(B))[1]))
#define MEMBLK_POSTPTR(B) \
(&((unsigned char *)(void *)(B))[(B)->rawsize + sizeof(Memento_BlkHeader)])
enum
{
SkipStackBackTraceLevels = 4
};
#if defined(MEMENTO_STACKTRACE_METHOD) && MEMENTO_STACKTRACE_METHOD == 1
extern size_t backtrace(void **, int);
extern void backtrace_symbols_fd(void **, size_t, int);
extern char **backtrace_symbols(void **, size_t);
#define MEMENTO_BACKTRACE_MAX 256
static void (*print_stack_value)(void *address);
/* Libbacktrace gubbins - relies on us having libdl to load the .so */
#ifdef HAVE_LIBDL
#include <dlfcn.h>
typedef void (*backtrace_error_callback) (void *data, const char *msg, int errnum);
typedef struct backtrace_state *(*backtrace_create_state_type)(
const char *filename, int threaded,
backtrace_error_callback error_callback, void *data);
typedef int (*backtrace_full_callback) (void *data, uintptr_t pc,
const char *filename, int lineno,
const char *function);
typedef int (*backtrace_pcinfo_type)(struct backtrace_state *state,
uintptr_t pc,
backtrace_full_callback callback,
backtrace_error_callback error_callback,
void *data);
typedef void (*backtrace_syminfo_callback) (void *data, uintptr_t pc,
const char *symname,
uintptr_t symval,
uintptr_t symsize);
typedef int (*backtrace_syminfo_type)(struct backtrace_state *state,
uintptr_t addr,
backtrace_syminfo_callback callback,
backtrace_error_callback error_callback,
void *data);
static backtrace_syminfo_type backtrace_syminfo;
static backtrace_create_state_type backtrace_create_state;
static backtrace_pcinfo_type backtrace_pcinfo;
static struct backtrace_state *my_backtrace_state;
static void *libbt;
static char backtrace_exe[4096];
static void *current_addr;
static void error2_cb(void *data, const char *msg, int errnum)
{
}
static void syminfo_cb(void *data, uintptr_t pc, const char *symname, uintptr_t symval, uintptr_t symsize)
{
if (sizeof(void *) == 4)
fprintf(stderr, " 0x%08lx %s\n", pc, symname?symname:"?");
else
fprintf(stderr, " 0x%016lx %s\n", pc, symname?symname:"?");
}
static void error_cb(void *data, const char *msg, int errnum)
{
backtrace_syminfo(my_backtrace_state,
(uintptr_t)current_addr,
syminfo_cb,
error2_cb,
NULL);
}
static int full_cb(void *data, uintptr_t pc, const char *fname, int line, const char *fn)
{
if (sizeof(void *) == 4)
fprintf(stderr, " 0x%08lx %s(%s:%d)\n", pc, fn?fn:"?", fname?fname:"?", line);
else
fprintf(stderr, " 0x%016lx %s(%s:%d)\n", pc, fn?fn:"?", fname?fname:"?", line);
return 0;
}
static void print_stack_libbt(void *addr)
{
current_addr = addr;
backtrace_pcinfo(my_backtrace_state,
(uintptr_t)addr,
full_cb,
error_cb,
NULL);
}
static void print_stack_libbt_failed(void *addr)
{
char **strings;
#if 0
/* Let's use a hack from Julian Smith to call gdb to extract the information */
/* Disabled for now, as I can't make this work. */
static char command[1024];
int e;
static int gdb_invocation_failed = 0;
if (gdb_invocation_failed == 0)
{
snprintf(command, sizeof(command),
//"gdb -q --batch -p=%i -ex 'info line *%p' -ex quit 2>/dev/null",
"gdb -q --batch -p=%i -ex 'info line *%p' -ex quit 2>/dev/null| egrep -v '(Thread debugging using)|(Using host libthread_db library)|(A debugging session is active)|(will be detached)|(Quit anyway)|(No such file or directory)|(^0x)|(^$)'",
getpid(), addr);
printf("%s\n", command);
e = system(command);
if (e == 0)
return; /* That'll do! */
gdb_invocation_failed = 1; /* If it's failed once, it'll probably keep failing. */
}
#endif
/* We couldn't even get gdb! Make do. */
strings = backtrace_symbols(&addr, 1);
if (strings == NULL || strings[0] == NULL)
{
if (sizeof(void *) == 4)
fprintf(stderr, " [0x%08lx]\n", (uintptr_t)addr);
else
fprintf(stderr, " [0x%016lx]\n", (uintptr_t)addr);
}
else
{
fprintf(stderr, " %s\n", strings[0]);
}
(free)(strings);
}
static int init_libbt(void)
{
static int libbt_inited = 0;
if (libbt_inited)
return 0;
libbt_inited = 1;
libbt = dlopen("libbacktrace.so", RTLD_LAZY);
if (libbt == NULL)
libbt = dlopen("/opt/lib/libbacktrace.so", RTLD_LAZY);
if (libbt == NULL)
libbt = dlopen("/lib/libbacktrace.so", RTLD_LAZY);
if (libbt == NULL)
libbt = dlopen("/usr/lib/libbacktrace.so", RTLD_LAZY);
if (libbt == NULL)
libbt = dlopen("/usr/local/lib/libbacktrace.so", RTLD_LAZY);
if (libbt == NULL)
goto fail;
backtrace_create_state = dlsym(libbt, "backtrace_create_state");
backtrace_syminfo = dlsym(libbt, "backtrace_syminfo");
backtrace_pcinfo = dlsym(libbt, "backtrace_pcinfo");
if (backtrace_create_state == NULL ||
backtrace_syminfo == NULL ||
backtrace_pcinfo == NULL)
{
goto fail;
}
my_backtrace_state = backtrace_create_state(backtrace_exe,
1 /*BACKTRACE_SUPPORTS_THREADS*/,
error_cb,
NULL);
if (my_backtrace_state == NULL)
goto fail;
print_stack_value = print_stack_libbt;
return 1;
fail:
fprintf(stderr,
"MEMENTO: libbacktrace.so failed to load; backtraces will be sparse.\n"
"MEMENTO: See memento.h for how to rectify this.\n");
libbt = NULL;
backtrace_create_state = NULL;
backtrace_syminfo = NULL;
print_stack_value = print_stack_libbt_failed;
return 0;
}
#endif
static void print_stack_default(void *addr)
{
char **strings = backtrace_symbols(&addr, 1);
if (strings == NULL || strings[0] == NULL)
{
fprintf(stderr, " ["FMTP"]\n", addr);
}
#ifdef HAVE_LIBDL
else if (strchr(strings[0], ':') == NULL)
{
/* Probably a "path [address]" format string */
char *s = strchr(strings[0], ' ');
if (s != strings[0])
{
memcpy(backtrace_exe, strings[0], s - strings[0]);
backtrace_exe[s-strings[0]] = 0;
init_libbt();
print_stack_value(addr);
}
}
#endif
else
{
fprintf(stderr, " %s\n", strings[0]);
}
free(strings);
}
static void Memento_initStacktracer(void)
{
print_stack_value = print_stack_default;
}
static int Memento_getStacktrace(void **stack, int *skip)
{
size_t num;
num = backtrace(&stack[0], MEMENTO_BACKTRACE_MAX);
*skip = SkipStackBackTraceLevels;
if (num <= SkipStackBackTraceLevels)
return 0;
return (int)(num-SkipStackBackTraceLevels);
}
static void Memento_showStacktrace(void **stack, int numberOfFrames)
{
int i;
for (i = 0; i < numberOfFrames; i++)
{
print_stack_value(stack[i]);
}
}
#elif defined(MEMENTO_STACKTRACE_METHOD) && MEMENTO_STACKTRACE_METHOD == 2
#include <Windows.h>
/* We use DbgHelp.dll rather than DbgHelp.lib. This avoids us needing
* extra link time complications, and enables us to fall back gracefully
* if the DLL cannot be found.
*
* To achieve this we have our own potted versions of the required types
* inline here.
*/
#ifdef _WIN64
typedef DWORD64 DWORD_NATIVESIZED;
#else
typedef DWORD DWORD_NATIVESIZED;
#endif
#define MEMENTO_BACKTRACE_MAX 64
typedef USHORT (__stdcall *My_CaptureStackBackTraceType)(__in ULONG, __in ULONG, __out PVOID*, __out_opt PULONG);
typedef struct MY_IMAGEHLP_LINE {
DWORD SizeOfStruct;
PVOID Key;
DWORD LineNumber;
PCHAR FileName;
DWORD_NATIVESIZED Address;
} MY_IMAGEHLP_LINE, *MY_PIMAGEHLP_LINE;
typedef BOOL (__stdcall *My_SymGetLineFromAddrType)(HANDLE hProcess, DWORD_NATIVESIZED dwAddr, PDWORD pdwDisplacement, MY_PIMAGEHLP_LINE Line);
typedef struct MY_SYMBOL_INFO {
ULONG SizeOfStruct;
ULONG TypeIndex; // Type Index of symbol
ULONG64 Reserved[2];
ULONG info;
ULONG Size;
ULONG64 ModBase; // Base Address of module containing this symbol
ULONG Flags;
ULONG64 Value; // Value of symbol, ValuePresent should be 1
ULONG64 Address; // Address of symbol including base address of module
ULONG Register; // register holding value or pointer to value
ULONG Scope; // scope of the symbol
ULONG Tag; // pdb classification
ULONG NameLen; // Actual length of name
ULONG MaxNameLen;
CHAR Name[1]; // Name of symbol
} MY_SYMBOL_INFO, *MY_PSYMBOL_INFO;
typedef BOOL (__stdcall *My_SymFromAddrType)(HANDLE hProcess, DWORD64 Address, PDWORD64 Displacement, MY_PSYMBOL_INFO Symbol);
typedef BOOL (__stdcall *My_SymInitializeType)(HANDLE hProcess, PSTR UserSearchPath, BOOL fInvadeProcess);
static My_CaptureStackBackTraceType Memento_CaptureStackBackTrace;
static My_SymGetLineFromAddrType Memento_SymGetLineFromAddr;
static My_SymFromAddrType Memento_SymFromAddr;
static My_SymInitializeType Memento_SymInitialize;
static HANDLE Memento_process;
static void Memento_initStacktracer(void)
{
HMODULE mod = LoadLibrary("kernel32.dll");
if (mod == NULL)
return;
Memento_CaptureStackBackTrace = (My_CaptureStackBackTraceType)(GetProcAddress(mod, "RtlCaptureStackBackTrace"));
if (Memento_CaptureStackBackTrace == NULL)
return;
mod = LoadLibrary("Dbghelp.dll");
if (mod == NULL) {
Memento_CaptureStackBackTrace = NULL;
return;
}
Memento_SymGetLineFromAddr =
(My_SymGetLineFromAddrType)(GetProcAddress(mod,
#ifdef _WIN64
"SymGetLineFromAddr64"
#else
"SymGetLineFromAddr"
#endif
));
if (Memento_SymGetLineFromAddr == NULL) {
Memento_CaptureStackBackTrace = NULL;
return;
}
Memento_SymFromAddr = (My_SymFromAddrType)(GetProcAddress(mod, "SymFromAddr"));
if (Memento_SymFromAddr == NULL) {
Memento_CaptureStackBackTrace = NULL;
return;
}
Memento_SymInitialize = (My_SymInitializeType)(GetProcAddress(mod, "SymInitialize"));
if (Memento_SymInitialize == NULL) {
Memento_CaptureStackBackTrace = NULL;
return;
}
Memento_process = GetCurrentProcess();
Memento_SymInitialize(Memento_process, NULL, TRUE);
}
static int Memento_getStacktrace(void **stack, int *skip)
{
if (Memento_CaptureStackBackTrace == NULL)
return 0;
*skip = 0;
/* Limit us to 63 levels due to windows bug */
return Memento_CaptureStackBackTrace(SkipStackBackTraceLevels, 63-SkipStackBackTraceLevels, stack, NULL);
}
static void Memento_showStacktrace(void **stack, int numberOfFrames)
{
MY_IMAGEHLP_LINE line;
int i;
char symbol_buffer[sizeof(MY_SYMBOL_INFO) + 1024 + 1];
MY_SYMBOL_INFO *symbol = (MY_SYMBOL_INFO *)symbol_buffer;
symbol->MaxNameLen = 1024;
symbol->SizeOfStruct = sizeof(MY_SYMBOL_INFO);
line.SizeOfStruct = sizeof(MY_IMAGEHLP_LINE);
for (i = 0; i < numberOfFrames; i++)
{
DWORD64 dwDisplacement64;
DWORD dwDisplacement;
Memento_SymFromAddr(Memento_process, (DWORD64)(stack[i]), &dwDisplacement64, symbol);
Memento_SymGetLineFromAddr(Memento_process, (DWORD_NATIVESIZED)(stack[i]), &dwDisplacement, &line);
fprintf(stderr, " %s in %s:%d\n", symbol->Name, line.FileName, line.LineNumber);
}
}
#elif defined(MEMENTO_STACKTRACE_METHOD) && MEMENTO_STACKTRACE_METHOD == 3
#include <unwind.h>
#include <dlfcn.h>
/* From cxxabi.h */
extern char* __cxa_demangle(const char* mangled_name,
char* output_buffer,
size_t* length,
int* status);
static void Memento_initStacktracer(void)
{
}
#define MEMENTO_BACKTRACE_MAX 256
typedef struct
{
int count;
void **addr;
} my_unwind_details;
static _Unwind_Reason_Code unwind_populate_callback(struct _Unwind_Context *context,
void *arg)
{
my_unwind_details *uw = (my_unwind_details *)arg;
int count = uw->count;
if (count >= MEMENTO_BACKTRACE_MAX)
return _URC_END_OF_STACK;
uw->addr[count] = (void *)_Unwind_GetIP(context);
uw->count++;
return _URC_NO_REASON;
}
static int Memento_getStacktrace(void **stack, int *skip)
{
my_unwind_details uw = { 0, stack };
*skip = 0;
/* Collect the backtrace. Deliberately only unwind once,
* and avoid using malloc etc until this completes just
* in case. */
_Unwind_Backtrace(unwind_populate_callback, &uw);
if (uw.count <= SkipStackBackTraceLevels)
return 0;
*skip = SkipStackBackTraceLevels;
return uw.count-SkipStackBackTraceLevels;
}
static void Memento_showStacktrace(void **stack, int numberOfFrames)
{
int i;
for (i = 0; i < numberOfFrames; i++)
{
Dl_info info;
if (dladdr(stack[i], &info))
{
int status = 0;
const char *sym = info.dli_sname ? info.dli_sname : "<unknown>";
char *demangled = __cxa_demangle(sym, NULL, 0, &status);
int offset = stack[i] - info.dli_saddr;
fprintf(stderr, " ["FMTP"]%s(+0x%x)\n", stack[i], demangled && status == 0 ? demangled : sym, offset);
free(demangled);
}
else
{
fprintf(stderr, " ["FMTP"]\n", stack[i]);
}
}
}
#else
static void Memento_initStacktracer(void)
{
}
static int Memento_getStacktrace(void **stack, int *skip)
{
*skip = 0;
return 0;
}
static void Memento_showStacktrace(void **stack, int numberOfFrames)
{
}
#endif /* MEMENTO_STACKTRACE_METHOD */
#ifdef MEMENTO_DETAILS
static void Memento_storeDetails(Memento_BlkHeader *head, int type)
{
void *stack[MEMENTO_BACKTRACE_MAX];
Memento_BlkDetails *details;
int count;
int skip;
if (head == NULL)
return;
#ifdef MEMENTO_STACKTRACE_METHOD
count = Memento_getStacktrace(stack, &skip);
#else
skip = 0;
count = 0;
#endif
details = MEMENTO_UNDERLYING_MALLOC(sizeof(*details) + (count-1) * sizeof(void *));
if (details == NULL)
return;
if (count)
memcpy(&details->stack, &stack[skip], count * sizeof(void *));
details->type = type;
details->count = count;
details->sequence = memento.sequence;
details->next = NULL;
VALGRIND_MAKE_MEM_DEFINED(&head->details_tail, sizeof(head->details_tail));
*head->details_tail = details;
head->details_tail = &details->next;
VALGRIND_MAKE_MEM_NOACCESS(&head->details_tail, sizeof(head->details_tail));
}
#endif
void (Memento_bt)(void)
{
#ifdef MEMENTO_STACKTRACE_METHOD
void *stack[MEMENTO_BACKTRACE_MAX];
int count;
int skip;
count = Memento_getStacktrace(stack, &skip);
Memento_showStacktrace(&stack[skip-2], count-skip+2);
#endif
}
static void Memento_bt_internal(int skip2)
{
#ifdef MEMENTO_STACKTRACE_METHOD
void *stack[MEMENTO_BACKTRACE_MAX];
int count;
int skip;
count = Memento_getStacktrace(stack, &skip);
Memento_showStacktrace(&stack[skip+skip2], count-skip-skip2);
#endif
}
static int Memento_checkAllMemoryLocked(void);
void Memento_breakpoint(void)
{
/* A handy externally visible function for breakpointing */
#if 0 /* Enable this to force automatic breakpointing */
#ifndef NDEBUG
#ifdef _MSC_VER
__asm int 3;
#endif
#endif
#endif
}
static void Memento_init(void);
#define MEMENTO_LOCK() \
do { if (!memento.inited) Memento_init(); MEMENTO_DO_LOCK(); } while (0)
#define MEMENTO_UNLOCK() \
do { MEMENTO_DO_UNLOCK(); } while (0)
/* Do this as a macro to prevent another level in the callstack,
* which is annoying while stepping. */
#define Memento_breakpointLocked() \
do { MEMENTO_UNLOCK(); Memento_breakpoint(); MEMENTO_LOCK(); } while (0)