143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
/* Copyright (C) 2009-2020 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libitm_i.h"
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namespace GTM HIDDEN {
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void
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gtm_thread::record_allocation (void *ptr, void (*free_fn)(void *))
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{
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// We do not deallocate before outermost commit, so we should never have
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// an existing log entry for a new allocation.
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gtm_alloc_action *a = this->alloc_actions.insert((uintptr_t) ptr);
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a->free_fn = free_fn;
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a->free_fn_sz = 0;
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a->allocated = true;
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}
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void
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gtm_thread::forget_allocation (void *ptr, void (*free_fn)(void *))
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{
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// We do not deallocate before outermost commit, so we should never have
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// an existing log entry for a deallocation at the same address. We may
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// have an existing entry for a matching allocation, but this is handled
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// correctly because both are complementary in that only one of these will
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// cause an action at commit or abort.
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gtm_alloc_action *a = this->alloc_actions.insert((uintptr_t) ptr);
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a->free_fn = free_fn;
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a->free_fn_sz = 0;
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a->allocated = false;
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}
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void
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gtm_thread::forget_allocation (void *ptr, size_t sz,
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void (*free_fn_sz)(void *, size_t))
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{
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// Same as forget_allocation but with a size.
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gtm_alloc_action *a = this->alloc_actions.insert((uintptr_t) ptr);
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a->free_fn = 0;
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a->free_fn_sz = free_fn_sz;
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a->sz = sz;
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a->allocated = false;
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}
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namespace {
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struct commit_cb_data {
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aa_tree<uintptr_t, gtm_alloc_action>* parent;
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bool revert_p;
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};
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}
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static void
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commit_allocations_2 (uintptr_t key, gtm_alloc_action *a, void *data)
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{
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void *ptr = (void *)key;
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commit_cb_data *cb_data = static_cast<commit_cb_data *>(data);
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if (cb_data->revert_p)
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{
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// Roll back nested allocations, discard deallocations.
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if (a->allocated)
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{
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if (a->free_fn_sz != 0)
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a->free_fn_sz (ptr, a->sz);
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else
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a->free_fn (ptr);
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}
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}
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else
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{
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// Add allocations and deallocations to parent.
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// ??? We could eliminate a (parent) allocation that matches this
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// a deallocation, if we had support for removing all accesses
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// to this allocation from the transaction's undo and redo logs
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// (otherwise, the parent transaction's undo or redo might write to
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// data that is already shared again because of calling free()).
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// We don't have this support currently, and the benefit of this
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// optimization is unknown, so just add it to the parent.
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gtm_alloc_action* a_parent = cb_data->parent->insert(key);
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*a_parent = *a;
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}
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}
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static void
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commit_allocations_1 (uintptr_t key, gtm_alloc_action *a, void *cb_data)
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{
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void *ptr = (void *)key;
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bool revert_p = (bool) (uintptr_t) cb_data;
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if (revert_p == a->allocated)
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{
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if (a->free_fn_sz != 0)
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a->free_fn_sz (ptr, a->sz);
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else
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a->free_fn (ptr);
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}
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}
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/* Permanently commit allocated memory during transaction.
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REVERT_P is true if instead of committing the allocations, we want
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to roll them back (and vice versa). */
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void
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gtm_thread::commit_allocations (bool revert_p,
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aa_tree<uintptr_t, gtm_alloc_action>* parent)
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{
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if (parent)
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{
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commit_cb_data cb_data;
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cb_data.parent = parent;
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cb_data.revert_p = revert_p;
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this->alloc_actions.traverse (commit_allocations_2, &cb_data);
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}
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else
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this->alloc_actions.traverse (commit_allocations_1,
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(void *)(uintptr_t)revert_p);
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this->alloc_actions.clear ();
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}
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} // namespace GTM
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