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/* Provide the runtime infrastructure for the transactional memory lib.

   Copyright (C) 2011 Free Software Foundation, Inc.

   Contributed by Iain Sandoe <iains@gcc.gnu.org>

   This file is part of GCC.

GCC 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 3, or (at your option) any later

version.

GCC 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.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#include "tsystem.h"

#include <stddef.h>

#include <dlfcn.h>

#include <mach-o/dyld.h>

#include <mach-o/getsect.h>

#ifdef __LP64__

#define GET_DATA_TMCT(mh,size) \

  getsectdatafromheader_64 ((struct mach_header_64*) mh, \

                            "__DATA", "__tm_clone_table", (uint64_t *)size)

#else

#define GET_DATA_TMCT(mh,size) \

  getsectdatafromheader (mh, "__DATA", "__tm_clone_table", (uint32_t *)size)

#endif

#define WEAK __attribute__((weak))

#define UNUSED __attribute__((unused))

extern void _ITM_registerTMCloneTable (void *, size_t) WEAK;

extern void _ITM_deregisterTMCloneTable (void *) WEAK;

#if defined(START) || defined(END)

static inline void *getTMCloneTable (const void *f, size_t *tmct_siz)

{

  char *tmct_fixed, *tmct = NULL;

  unsigned int i, img_count;

  struct mach_header *mh;

  Dl_info info;

  if (! dladdr (f, &info) || info.dli_fbase == NULL)

    abort ();

  mh = (struct mach_header *) info.dli_fbase;

  tmct_fixed = GET_DATA_TMCT (mh, tmct_siz);

  *tmct_siz /= (sizeof (size_t) * 2);

  /* No tm_clone_table or no clones. */

  if (tmct_fixed == NULL || *tmct_siz == 0)

    return NULL;

  img_count = _dyld_image_count();

  for (i = 0; i < img_count && tmct == NULL; i++)

    {

      if (mh == _dyld_get_image_header(i))

        tmct = tmct_fixed + (unsigned long)_dyld_get_image_vmaddr_slide(i);

    }

  return tmct;

}

#endif

#ifdef START

void __doTMRegistrations (void) __attribute__ ((constructor));

void __doTMRegistrations (void)

{

  size_t tmct_siz;

  void *tmct;

  tmct = getTMCloneTable ((const void *)&__doTMRegistrations, &tmct_siz);

  if (_ITM_registerTMCloneTable != NULL && tmct != NULL)

    _ITM_registerTMCloneTable (tmct, (size_t)tmct_siz);

}

#endif

#ifdef END

void __doTMdeRegistrations (void) __attribute__ ((destructor));

void __doTMdeRegistrations (void)

{

  size_t tmct_siz;

  void *tmct;

  tmct = getTMCloneTable ((const void *)&__doTMdeRegistrations, &tmct_siz);

  if (_ITM_deregisterTMCloneTable != NULL && tmct != NULL)

    _ITM_deregisterTMCloneTable (tmct);

}

/* Provide dummy functions to satisfy linkage for versions of the Darwin

   tool-chain that that can't handle undefined weak refs at the link stage.

   ??? Define these dummy functions only when !HAVE_ELF_STYLE_WEAKREF. */

extern void *__cxa_allocate_exception (size_t) WEAK;

extern void __cxa_throw (void *, void *, void *) WEAK;

extern void *__cxa_begin_catch (void *) WEAK;

extern void *__cxa_end_catch (void) WEAK;

extern void __cxa_tm_cleanup (void *, void *, unsigned int) WEAK;

extern void *_ZnwX (size_t) WEAK;

extern void _ZdlPv (void *) WEAK;

extern void *_ZnaX (size_t) WEAK;

extern void _ZdaPv (void *) WEAK;

typedef const struct nothrow_t { } *c_nothrow_p;

extern void *_ZnwXRKSt9nothrow_t (size_t, c_nothrow_p) WEAK;

extern void _ZdlPvRKSt9nothrow_t (void *, c_nothrow_p) WEAK;

extern void *_ZnaXRKSt9nothrow_t (size_t, c_nothrow_p) WEAK;

extern void _ZdaPvRKSt9nothrow_t (void *, c_nothrow_p) WEAK;

void *__cxa_allocate_exception (size_t s UNUSED) { return NULL; }

void __cxa_throw (void * a UNUSED, void * b UNUSED, void * c UNUSED)

  { return; }

void *__cxa_begin_catch (void * a UNUSED) { return NULL; }

void *__cxa_end_catch (void) { return NULL; }

void __cxa_tm_cleanup (void * a UNUSED, void * b UNUSED, unsigned int c UNUSED)

  { return; }

void *_ZnwX (size_t s UNUSED) { return NULL; }

void _ZdlPv (void * a UNUSED) { return; }

void *_ZnaX (size_t s UNUSED) { return NULL; }

void _ZdaPv (void * a UNUSED) { return; }

void *_ZnwXRKSt9nothrow_t (size_t s UNUSED, c_nothrow_p b UNUSED)

  { return NULL; }

void _ZdlPvRKSt9nothrow_t (void * a UNUSED, c_nothrow_p b UNUSED)  { return; }

void *_ZnaXRKSt9nothrow_t (size_t s UNUSED, c_nothrow_p b UNUSED)

  { return NULL; }

void _ZdaPvRKSt9nothrow_t (void * a UNUSED, c_nothrow_p b UNUSED) { return; }

#endif