/* Copyright (C) 2009-2026 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 { voidgtm_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;} voidgtm_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;} voidgtm_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 voidcommit_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 voidcommit_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).  */voidgtm_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