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/*--------------------------------------------------------------------*/
/*--- Replacements for malloc() et al, which run on the simulated ---*/
/*--- CPU. vg_replace_malloc.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, an extensible x86 protected-mode
emulator for monitoring program execution on x86-Unixes.
Copyright (C) 2000-2004 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
/* ---------------------------------------------------------------------
All the code in this file runs on the SIMULATED CPU. It is intended
for various reasons as drop-in replacements for malloc() and friends.
These functions have global scope, but are not intended to be called
directly. See the comments in coregrind/vg_intercept.c.base for the
gory details.
This file can be linked into the injected so file for any tool that
wishes to know about calls to malloc(). It should define functions
SK_(malloc) et al that will be called.
------------------------------------------------------------------ */
#include "valgrind.h" /* for VALGRIND_NON_SIMD_CALL[12] */
#include "core.h"
#define LIBALIAS(ret, name, args) \
ret VG_INTERCEPT(soname:libstdc++*, __libc_##name) args \
__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, ##name)), \
visibility("protected"))); \
ret VG_INTERCEPT(soname:libc.so.6, __libc_##name) args \
__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, ##name)), \
visibility("protected"))); \
ret VG_INTERCEPT(soname:libstdc++*, __##name) args \
__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, ##name)), \
visibility("protected"))); \
ret VG_INTERCEPT(soname:libc.so.6, __##name) args \
__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, ##name)), \
visibility("protected"))); \
ret VG_INTERCEPT(soname:libstdc++*, ##name) args \
__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, ##name)), \
visibility("protected"))); \
ret VG_INTERCEPT(soname:libc.so.6, ##name) args
extern void _exit(int);
/*------------------------------------------------------------*/
/*--- Replacing malloc() et al ---*/
/*------------------------------------------------------------*/
static struct vg_mallocfunc_info info;
static int init_done;
/* Startup hook - called as init section */
static void init(void) __attribute__((constructor));
/* Below are new versions of malloc, __builtin_new, free,
__builtin_delete, calloc, realloc, memalign, and friends.
None of these functions are called directly - they are not meant to
be found by the dynamic linker. They get called because
vg_replace_malloc installs a bunch of code redirects which causes
Valgrind to use these functions rather than the ones they're
replacing.
*/
#define MALLOC_TRACE(format, args...) \
if (info.clo_trace_malloc) \
VALGRIND_INTERNAL_PRINTF(format, ## args )
#define MAYBE_SLOPPIFY(n) \
if (info.clo_sloppy_malloc) { \
n = (n+(VG_SLOPPY_MALLOC_SZB-1)) & ~(VG_SLOPPY_MALLOC_SZB-1); \
}
/* ALL calls to malloc() and friends wind up here. */
#define ALLOC(fff, vgfff) \
LIBALIAS(void *, fff, (SizeT n)) \
{ \
void* v; \
\
MALLOC_TRACE(#fff "(%d)", n ); \
MAYBE_SLOPPIFY(n); \
if (!init_done) init(); \
\
v = (void*)VALGRIND_NON_SIMD_CALL1( info.sk_##vgfff, n ); \
MALLOC_TRACE(" = %p", v ); \
return v; \
}
#define ALLOC2(fff, vgfff) \
LIBALIAS(void *, fff, (SizeT n)) \
{ \
void* v; \
\
MALLOC_TRACE(#fff "(%d)", n ); \
MAYBE_SLOPPIFY(n); \
if (!init_done) init(); \
\
v = (void*)VALGRIND_NON_SIMD_CALL1( info.sk_##vgfff, n ); \
MALLOC_TRACE(" = %p", v ); \
if (NULL == v) { \
VALGRIND_PRINTF_BACKTRACE( \
"new/new[] failed and should throw an exception, but Valgrind\n" \
" cannot throw exceptions and so is aborting instead. Sorry."); \
_exit(1); \
} \
return v; \
}
ALLOC( malloc, malloc );
ALLOC2(__builtin_new, __builtin_new );
ALLOC2(_Znwj, __builtin_new );
// operator new(unsigned, std::nothrow_t const&)
ALLOC( _ZnwjRKSt9nothrow_t, __builtin_new );
ALLOC2(__builtin_vec_new, __builtin_vec_new );
ALLOC2(_Znaj, __builtin_vec_new );
// operator new[](unsigned, std::nothrow_t const&)
ALLOC( _ZnajRKSt9nothrow_t, __builtin_vec_new );
#define FREE(fff, vgfff) \
LIBALIAS(void, fff, (void *p)) \
{ \
MALLOC_TRACE(#fff "(%p)", p ); \
if (p == NULL) \
return; \
if (!init_done) init(); \
(void)VALGRIND_NON_SIMD_CALL1( info.sk_##vgfff, p ); \
}
FREE( free, free );
FREE( cfree, free );
FREE( __builtin_delete, __builtin_delete );
FREE( _ZdlPv, __builtin_delete );
// operator delete(void*, std::nothrow_t const&)
FREE( _ZdlPvRKSt9nothrow_t, __builtin_delete );
FREE( __builtin_vec_delete, __builtin_vec_delete );
FREE( _ZdaPv, __builtin_vec_delete );
// operator delete[](void*, std::nothrow_t const&)
FREE( _ZdaPvRKSt9nothrow_t, __builtin_vec_delete );
LIBALIAS(void*, calloc, ( SizeT nmemb, SizeT size ))
{
void* v;
MALLOC_TRACE("calloc(%d,%d)", nmemb, size );
MAYBE_SLOPPIFY(size);
if (!init_done) init();
v = (void*)VALGRIND_NON_SIMD_CALL2( info.sk_calloc, nmemb, size );
MALLOC_TRACE(" = %p", v );
return v;
}
LIBALIAS(void*, realloc, ( void* ptrV, SizeT new_size ))
{
void* v;
MALLOC_TRACE("realloc(%p,%d)", ptrV, new_size );
MAYBE_SLOPPIFY(new_size);
if (ptrV == NULL)
return VG_INTERCEPT(soname:libc.so.6, malloc)(new_size);
if (new_size <= 0) {
VG_INTERCEPT(soname:libc.so.6, free)(ptrV);
if (info.clo_trace_malloc)
VALGRIND_INTERNAL_PRINTF(" = 0" );
return NULL;
}
if (!init_done) init();
v = (void*)VALGRIND_NON_SIMD_CALL2( info.sk_realloc, ptrV, new_size );
MALLOC_TRACE(" = %p", v );
return v;
}
LIBALIAS(void*, memalign, ( SizeT alignment, SizeT n ))
{
void* v;
MALLOC_TRACE("memalign(al %d, size %d)", alignment, n );
MAYBE_SLOPPIFY(n);
// Round up to minimum alignment if necessary.
if (alignment < VG_MIN_MALLOC_SZB) alignment = VG_MIN_MALLOC_SZB;
// Round up to nearest power-of-two if necessary (like glibc).
while (0 != (alignment & (alignment - 1))) alignment++;
if (!init_done) init();
v = (void*)VALGRIND_NON_SIMD_CALL2( info.sk_memalign, alignment, n );
MALLOC_TRACE(" = %p", v );
return v;
}
LIBALIAS(void*, valloc, ( SizeT size ))
{
return VG_INTERCEPT(soname:libc.so.6, memalign)(VKI_PAGE_SIZE, size);
}
/* Various compatibility wrapper functions, for glibc and libstdc++. */
LIBALIAS(int, mallopt, ( int cmd, int value ))
{
/* In glibc-2.2.4, 1 denotes a successful return value for mallopt */
return 1;
}
LIBALIAS(int, posix_memalign, ( void **memptr, SizeT alignment, SizeT size ))
{
void *mem;
/* Test whether the alignment argument is valid. It must be a power of
two multiple of sizeof (void *). */
if (alignment % sizeof (void *) != 0 || (alignment & (alignment - 1)) != 0)
return VKI_EINVAL /*22*/ /*EINVAL*/;
mem = VG_INTERCEPT(soname:libc.so.6, memalign)(alignment, size);
if (mem != NULL) {
*memptr = mem;
return 0;
}
return VKI_ENOMEM /*12*/ /*ENOMEM*/;
}
LIBALIAS(int, malloc_usable_size, ( void* p ))
{
SizeT pszB;
MALLOC_TRACE("malloc_usable_size(%p)", p );
if (NULL == p)
return 0;
if (!init_done) init();
pszB = (SizeT)VALGRIND_NON_SIMD_CALL2( info.arena_payload_szB,
VG_AR_CLIENT, p );
MALLOC_TRACE(" = %d", pszB );
return pszB;
}
/* Bomb out if we get any of these. */
static void panic(const char *str)
{
VALGRIND_PRINTF_BACKTRACE("Program aborting because of call to %s", str);
_exit(99);
*(int *)0 = 'x';
}
#define PANIC(x) \
void VG_INTERCEPT(soname:libc.so.6, ## x)(void) \
{ \
panic(#x); \
}
PANIC(pvalloc);
PANIC(malloc_stats);
PANIC(malloc_trim);
PANIC(malloc_get_state);
PANIC(malloc_set_state);
/* Yet another ugly hack. Cannot include <malloc.h> because we
implement functions implemented there with different signatures.
This struct definition MUST match the system one. */
/* SVID2/XPG mallinfo structure */
struct mallinfo {
int arena; /* total space allocated from system */
int ordblks; /* number of non-inuse chunks */
int smblks; /* unused -- always zero */
int hblks; /* number of mmapped regions */
int hblkhd; /* total space in mmapped regions */
int usmblks; /* unused -- always zero */
int fsmblks; /* unused -- always zero */
int uordblks; /* total allocated space */
int fordblks; /* total non-inuse space */
int keepcost; /* top-most, releasable (via malloc_trim) space */
};
LIBALIAS(struct mallinfo, mallinfo, ( void ))
{
/* Should really try to return something a bit more meaningful */
UInt i;
struct mallinfo mi;
UChar* pmi = (UChar*)(&mi);
for (i = 0; i < sizeof(mi); i++)
pmi[i] = 0;
return mi;
}
/* All the code in here is unused until this function is called */
static void init(void)
{
int res;
if (init_done)
return;
init_done = 1;
VALGRIND_MAGIC_SEQUENCE(res, -1, VG_USERREQ__GET_MALLOCFUNCS, &info,
0, 0, 0);
}
/*--------------------------------------------------------------------*/
/*--- end vg_replace_malloc.c ---*/
/*--------------------------------------------------------------------*/
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