143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
/* Copyright (C) 2009-2017 Free Software Foundation, Inc.
|
|
Contributed by Richard Henderson <rth@redhat.com>.
|
|
|
|
This file is part of the GNU Transactional Memory Library (libitm).
|
|
|
|
Libitm 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Libitm 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 "libitm_i.h"
|
|
|
|
namespace GTM HIDDEN {
|
|
|
|
void
|
|
gtm_thread::record_allocation (void *ptr, void (*free_fn)(void *))
|
|
{
|
|
// We do not deallocate before outermost commit, so we should never have
|
|
// an existing log entry for a new allocation.
|
|
gtm_alloc_action *a = this->alloc_actions.insert((uintptr_t) ptr);
|
|
|
|
a->free_fn = free_fn;
|
|
a->free_fn_sz = 0;
|
|
a->allocated = true;
|
|
}
|
|
|
|
void
|
|
gtm_thread::forget_allocation (void *ptr, void (*free_fn)(void *))
|
|
{
|
|
// We do not deallocate before outermost commit, so we should never have
|
|
// an existing log entry for a deallocation at the same address. We may
|
|
// have an existing entry for a matching allocation, but this is handled
|
|
// correctly because both are complementary in that only one of these will
|
|
// cause an action at commit or abort.
|
|
gtm_alloc_action *a = this->alloc_actions.insert((uintptr_t) ptr);
|
|
a->free_fn = free_fn;
|
|
a->free_fn_sz = 0;
|
|
a->allocated = false;
|
|
}
|
|
|
|
void
|
|
gtm_thread::forget_allocation (void *ptr, size_t sz,
|
|
void (*free_fn_sz)(void *, size_t))
|
|
{
|
|
// Same as forget_allocation but with a size.
|
|
gtm_alloc_action *a = this->alloc_actions.insert((uintptr_t) ptr);
|
|
a->free_fn = 0;
|
|
a->free_fn_sz = free_fn_sz;
|
|
a->sz = sz;
|
|
a->allocated = false;
|
|
}
|
|
|
|
namespace {
|
|
struct commit_cb_data {
|
|
aa_tree<uintptr_t, gtm_alloc_action>* parent;
|
|
bool revert_p;
|
|
};
|
|
}
|
|
|
|
static void
|
|
commit_allocations_2 (uintptr_t key, gtm_alloc_action *a, void *data)
|
|
{
|
|
void *ptr = (void *)key;
|
|
commit_cb_data *cb_data = static_cast<commit_cb_data *>(data);
|
|
|
|
if (cb_data->revert_p)
|
|
{
|
|
// Roll back nested allocations, discard deallocations.
|
|
if (a->allocated)
|
|
{
|
|
if (a->free_fn_sz != 0)
|
|
a->free_fn_sz (ptr, a->sz);
|
|
else
|
|
a->free_fn (ptr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Add allocations and deallocations to parent.
|
|
// ??? We could eliminate a (parent) allocation that matches this
|
|
// a deallocation, if we had support for removing all accesses
|
|
// to this allocation from the transaction's undo and redo logs
|
|
// (otherwise, the parent transaction's undo or redo might write to
|
|
// data that is already shared again because of calling free()).
|
|
// We don't have this support currently, and the benefit of this
|
|
// optimization is unknown, so just add it to the parent.
|
|
gtm_alloc_action* a_parent = cb_data->parent->insert(key);
|
|
*a_parent = *a;
|
|
}
|
|
}
|
|
|
|
static void
|
|
commit_allocations_1 (uintptr_t key, gtm_alloc_action *a, void *cb_data)
|
|
{
|
|
void *ptr = (void *)key;
|
|
bool revert_p = (bool) (uintptr_t) cb_data;
|
|
|
|
if (revert_p == a->allocated)
|
|
{
|
|
if (a->free_fn_sz != 0)
|
|
a->free_fn_sz (ptr, a->sz);
|
|
else
|
|
a->free_fn (ptr);
|
|
}
|
|
}
|
|
|
|
/* Permanently commit allocated memory during transaction.
|
|
|
|
REVERT_P is true if instead of committing the allocations, we want
|
|
to roll them back (and vice versa). */
|
|
void
|
|
gtm_thread::commit_allocations (bool revert_p,
|
|
aa_tree<uintptr_t, gtm_alloc_action>* parent)
|
|
{
|
|
if (parent)
|
|
{
|
|
commit_cb_data cb_data;
|
|
cb_data.parent = parent;
|
|
cb_data.revert_p = revert_p;
|
|
this->alloc_actions.traverse (commit_allocations_2, &cb_data);
|
|
}
|
|
else
|
|
this->alloc_actions.traverse (commit_allocations_1,
|
|
(void *)(uintptr_t)revert_p);
|
|
this->alloc_actions.clear ();
|
|
}
|
|
|
|
} // namespace GTM
|