coregrind/vg_replace_malloc.c.base

/*--------------------------------------------------------------------*/
/*--- Replacements for malloc() et al, which run on the simulated  ---*/
/*--- CPU.                                     vg_replace_malloc.c ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2000-2005 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 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
   TL_(malloc) et al that will be called.
   ------------------------------------------------------------------ */

#include "valgrind.h"            /* for VALGRIND_NON_SIMD_CALL[12] */
#include "core.h"

// Nb: the last line is repeated -- once for the declaration, once for the
// definition.  If we don't have the declaration there GCC complains.
#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; \
   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));

// Functions for printing from code within Valgrind, but which runs on the
// sim'd CPU.  They must be functions rather than macros so that va_list can
// be used.
// Nb: at one point, these were used by multiple files that run on the sim'd
// CPU, and so were *defined* in core.h with the 'weak' attribute.  That was
// pretty ugly.  It's much better if this is the only file that needs them.

__attribute__((format(__printf__, 1, 2)))
static int
internal_printf(char *format, ...)
{
   UWord _qzz_res = 0;
   va_list vargs;
   va_start(vargs, format);
   VALGRIND_MAGIC_SEQUENCE(_qzz_res, 0, VG_USERREQ__INTERNAL_PRINTF,
                           (UWord)format, (UWord)vargs, 0, 0);
   va_end(vargs);
   return _qzz_res;
}

#define MALLOC_TRACE(format, args...)  \
   if (info.clo_trace_malloc)          \
      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); \
   }

/* 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.  But ALL client calls to malloc() and
   friends wind up here eventually.  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 ALLOC(fff, vgfff) \
LIBALIAS(void *, fff, (SizeT n)) \
{ \
   void* v; \
 \
   MALLOC_TRACE(#fff "(%llu)", (ULong)n ); \
   MAYBE_SLOPPIFY(n); \
   if (!init_done) init(); \
 \
   v = (void*)VALGRIND_NON_SIMD_CALL1( info.tl_##vgfff, n ); \
   MALLOC_TRACE(" = %p", v ); \
   return v; \
}

#define ALLOC2(fff, vgfff) \
LIBALIAS(void *, fff, (SizeT n)) \
{ \
   void* v; \
 \
   MALLOC_TRACE(#fff "(%llu)", (ULong)n ); \
   MAYBE_SLOPPIFY(n); \
   if (!init_done) init(); \
 \
   v = (void*)VALGRIND_NON_SIMD_CALL1( info.tl_##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.tl_##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(%llu,%llu)", (ULong)nmemb, (ULong)size );
   MAYBE_SLOPPIFY(size);

   if (!init_done) init();
   v = (void*)VALGRIND_NON_SIMD_CALL2( info.tl_calloc, nmemb, size );
   MALLOC_TRACE(" = %p", v );
   return v;
}

LIBALIAS(void*, realloc, ( void* ptrV, SizeT new_size ))
{
   void* v;

   MALLOC_TRACE("realloc(%p,%llu)", ptrV, (ULong)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) 
         internal_printf(" = 0" );
      return NULL;
   }   
   if (!init_done) init();
   v = (void*)VALGRIND_NON_SIMD_CALL2( info.tl_realloc, ptrV, new_size );
   MALLOC_TRACE(" = %p", v );
   return v;
}


LIBALIAS(void*, memalign, ( SizeT alignment, SizeT n ))
{
   void* v;

   MALLOC_TRACE("memalign(al %llu, size %llu)", (ULong)alignment, (ULong)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.tl_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(" = %llu", (ULong)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';
}

// As for LIBALIAS, we have the declaration to shut GCC up.
#define PANIC(x) \
   void VG_INTERCEPT(soname:libc.so.6, ## x)(void); \
   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 ---*/
/*--------------------------------------------------------------------*/