
/*--------------------------------------------------------------------*/
/*--- 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 ---*/
/*--------------------------------------------------------------------*/