// -*- C++ -*-
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//
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// Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 2, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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// MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free
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// software library without restriction. Specifically, if other files
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// instantiate templates or use macros or inline functions from this
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// file, or you compile this file and link it with other files to
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// produce an executable, this file does not by itself cause the
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// resulting executable to be covered by the GNU General Public
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// License. This exception does not however invalidate any other
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// reasons why the executable file might be covered by the GNU General
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// Public License.
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/** @file profile/impl/profiler_trace.h
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* @brief Data structures to represent profiling traces.
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*/
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// Written by Lixia Liu and Silvius Rus.
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#ifndef _GLIBCXX_PROFILE_PROFILER_TRACE_H
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#define _GLIBCXX_PROFILE_PROFILER_TRACE_H 1
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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#include <cerrno>
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#define _GLIBCXX_IMPL_UNORDERED_MAP std::_GLIBCXX_STD_PR::unordered_map
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#include <unordered_map>
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#else
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <tr1/unordered_map>
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#define _GLIBCXX_IMPL_UNORDERED_MAP std::tr1::unordered_map
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#endif
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#include <ext/concurrence.h>
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#include <fstream>
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#include <string>
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#include <utility>
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#include <bits/stl_heap.h> // for std::make_heap, std::sort_heap
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#include "profile/impl/profiler_state.h"
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#include "profile/impl/profiler_node.h"
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namespace __gnu_profile
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{
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/** @brief Internal environment. Values can be set one of two ways:
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1. In config file "var = value". The default config file path is
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libstdcxx-profile.conf.
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2. By setting process environment variables. For instance, in a Bash
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shell you can set the unit cost of iterating through a map like this:
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export __map_iterate_cost_factor=5.0.
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If a value is set both in the input file and through an environment
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variable, the environment value takes precedence. */
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typedef _GLIBCXX_IMPL_UNORDERED_MAP<std::string, std::string> __env_t;
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_GLIBCXX_PROFILE_DEFINE_UNINIT_DATA(__env_t, __env);
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/** @brief Master lock. */
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_GLIBCXX_PROFILE_DEFINE_UNINIT_DATA(__gnu_cxx::__mutex, __global_lock);
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/** @brief Representation of a warning. */
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struct __warning_data
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{
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float __magnitude;
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__stack_t __context;
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const char* __warning_id;
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const char* __warning_message;
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__warning_data()
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: __magnitude(0.0), __context(NULL), __warning_id(NULL),
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__warning_message(NULL) { }
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__warning_data(float __m, __stack_t __c, const char* __id,
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const char* __msg)
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: __magnitude(__m), __context(__c), __warning_id(__id),
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__warning_message(__msg) { }
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bool
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operator>(const struct __warning_data& __other) const
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{ return __magnitude > __other.__magnitude; }
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};
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typedef std::_GLIBCXX_STD_PR::vector<__warning_data> __warning_vector_t;
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// Defined in profiler_<diagnostic name>.h.
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class __trace_hash_func;
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class __trace_hashtable_size;
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class __trace_map2umap;
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class __trace_vector_size;
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class __trace_vector_to_list;
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class __trace_list_to_slist;
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class __trace_list_to_vector;
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void __trace_vector_size_init();
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void __trace_hashtable_size_init();
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void __trace_hash_func_init();
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void __trace_vector_to_list_init();
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void __trace_list_to_slist_init();
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void __trace_list_to_vector_init();
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void __trace_map_to_unordered_map_init();
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void __trace_vector_size_report(FILE*, __warning_vector_t&);
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void __trace_hashtable_size_report(FILE*, __warning_vector_t&);
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void __trace_hash_func_report(FILE*, __warning_vector_t&);
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void __trace_vector_to_list_report(FILE*, __warning_vector_t&);
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void __trace_list_to_slist_report(FILE*, __warning_vector_t&);
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void __trace_list_to_vector_report(FILE*, __warning_vector_t&);
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void __trace_map_to_unordered_map_report(FILE*, __warning_vector_t&);
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struct __cost_factor
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{
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const char* __env_var;
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float __value;
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};
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typedef std::_GLIBCXX_STD_PR::vector<__cost_factor*> __cost_factor_vector;
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_GLIBCXX_PROFILE_DEFINE_DATA(__trace_hash_func*, _S_hash_func, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(__trace_hashtable_size*, _S_hashtable_size, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(__trace_map2umap*, _S_map2umap, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(__trace_vector_size*, _S_vector_size, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(__trace_vector_to_list*, _S_vector_to_list, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(__trace_list_to_slist*, _S_list_to_slist, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(__trace_list_to_vector*, _S_list_to_vector, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __vector_shift_cost_factor,
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{"__vector_shift_cost_factor", 1.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __vector_iterate_cost_factor,
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{"__vector_iterate_cost_factor", 1.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __vector_resize_cost_factor,
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{"__vector_resize_cost_factor", 1.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __list_shift_cost_factor,
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{"__list_shift_cost_factor", 0.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __list_iterate_cost_factor,
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{"__list_iterate_cost_factor", 10.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __list_resize_cost_factor,
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{"__list_resize_cost_factor", 0.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __map_insert_cost_factor,
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{"__map_insert_cost_factor", 1.5});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __map_erase_cost_factor,
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{"__map_erase_cost_factor", 1.5});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __map_find_cost_factor,
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{"__map_find_cost_factor", 1});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __map_iterate_cost_factor,
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{"__map_iterate_cost_factor", 2.3});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __umap_insert_cost_factor,
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{"__umap_insert_cost_factor", 12.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __umap_erase_cost_factor,
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{"__umap_erase_cost_factor", 12.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __umap_find_cost_factor,
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{"__umap_find_cost_factor", 10.0});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor, __umap_iterate_cost_factor,
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{"__umap_iterate_cost_factor", 1.7});
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_GLIBCXX_PROFILE_DEFINE_DATA(__cost_factor_vector*, __cost_factors, NULL);
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_GLIBCXX_PROFILE_DEFINE_DATA(const char*, _S_trace_file_name,
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_GLIBCXX_PROFILE_TRACE_PATH_ROOT);
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_GLIBCXX_PROFILE_DEFINE_DATA(size_t, _S_max_warn_count,
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_GLIBCXX_PROFILE_MAX_WARN_COUNT);
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_GLIBCXX_PROFILE_DEFINE_DATA(size_t, _S_max_stack_depth,
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_GLIBCXX_PROFILE_MAX_STACK_DEPTH);
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_GLIBCXX_PROFILE_DEFINE_DATA(size_t, _S_max_mem,
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_GLIBCXX_PROFILE_MEM_PER_DIAGNOSTIC);
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inline size_t __stack_max_depth()
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{
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return _GLIBCXX_PROFILE_DATA(_S_max_stack_depth);
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}
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inline size_t __max_mem()
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{
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return _GLIBCXX_PROFILE_DATA(_S_max_mem);
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}
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/** @brief Base class for all trace producers. */
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template <typename __object_info, typename __stack_info>
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class __trace_base
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{
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public:
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__trace_base();
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virtual ~__trace_base() {}
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void __add_object(__object_t object, __object_info __info);
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__object_info* __get_object_info(__object_t __object);
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void __retire_object(__object_t __object);
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void __write(FILE* f);
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void __collect_warnings(__warning_vector_t& __warnings);
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private:
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__gnu_cxx::__mutex __object_table_lock;
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__gnu_cxx::__mutex __stack_table_lock;
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typedef _GLIBCXX_IMPL_UNORDERED_MAP<__object_t,
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__object_info> __object_table_t;
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typedef _GLIBCXX_IMPL_UNORDERED_MAP<__stack_t, __stack_info, __stack_hash,
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__stack_hash> __stack_table_t;
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__object_table_t __object_table;
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__stack_table_t __stack_table;
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size_t __stack_table_byte_size;
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protected:
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const char* __id;
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};
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template <typename __object_info, typename __stack_info>
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void __trace_base<__object_info, __stack_info>::__collect_warnings(
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__warning_vector_t& __warnings)
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{
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typename __stack_table_t::iterator __i = __stack_table.begin();
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for ( ; __i != __stack_table.end(); ++__i )
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{
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__warnings.push_back(__warning_data((*__i).second.__magnitude(),
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(*__i).first,
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__id,
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(*__i).second.__advice()));
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}
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}
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template <typename __object_info, typename __stack_info>
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__trace_base<__object_info, __stack_info>::__trace_base()
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{
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// Do not pick the initial size too large, as we don't know which diagnostics
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// are more active.
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__object_table.rehash(10000);
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__stack_table.rehash(10000);
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__stack_table_byte_size = 0;
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__id = NULL;
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}
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template <typename __object_info, typename __stack_info>
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void __trace_base<__object_info, __stack_info>::__add_object(
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__object_t __object, __object_info __info)
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{
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if (__max_mem() == 0
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|| __object_table.size() * sizeof(__object_info) <= __max_mem()) {
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this->__object_table_lock.lock();
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__object_table.insert(
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typename __object_table_t::value_type(__object, __info));
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this->__object_table_lock.unlock();
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}
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}
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template <typename __object_info, typename __stack_info>
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__object_info* __trace_base<__object_info, __stack_info>::__get_object_info(
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__object_t __object)
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{
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// XXX: Revisit this to see if we can decrease mutex spans.
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// Without this mutex, the object table could be rehashed during an
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// insertion on another thread, which could result in a segfault.
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this->__object_table_lock.lock();
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typename __object_table_t::iterator __object_it =
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__object_table.find(__object);
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if (__object_it == __object_table.end()){
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this->__object_table_lock.unlock();
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return NULL;
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} else {
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this->__object_table_lock.unlock();
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return &__object_it->second;
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}
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}
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template <typename __object_info, typename __stack_info>
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void __trace_base<__object_info, __stack_info>::__retire_object(
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__object_t __object)
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{
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this->__object_table_lock.lock();
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this->__stack_table_lock.lock();
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typename __object_table_t::iterator __object_it =
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__object_table.find(__object);
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if (__object_it != __object_table.end()){
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const __object_info& __info = __object_it->second;
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const __stack_t& __stack = __info.__stack();
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typename __stack_table_t::iterator __stack_it =
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__stack_table.find(__stack);
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if (__stack_it == __stack_table.end()) {
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// First occurence of this call context.
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if (__max_mem() == 0 || __stack_table_byte_size < __max_mem()) {
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__stack_table_byte_size +=
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(sizeof(__instruction_address_t) * __size(__stack)
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+ sizeof(__stack) + sizeof(__stack_info));
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__stack_table.insert(make_pair(__stack, __stack_info(__info)));
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}
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} else {
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// Merge object info into info summary for this call context.
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__stack_it->second.__merge(__info);
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delete __stack;
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}
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__object_table.erase(__object);
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}
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this->__object_table_lock.unlock();
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this->__stack_table_lock.unlock();
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}
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template <typename __object_info, typename __stack_info>
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void __trace_base<__object_info, __stack_info>::__write(FILE* __f)
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{
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typename __stack_table_t::iterator __it;
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for (__it = __stack_table.begin(); __it != __stack_table.end(); __it++) {
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if (__it->second.__is_valid()) {
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fprintf(__f, __id);
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fprintf(__f, "|");
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__gnu_profile::__write(__f, __it->first);
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fprintf(__f, "|");
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__it->second.__write(__f);
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}
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}
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}
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inline size_t __env_to_size_t(const char* __env_var, size_t __default_value)
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{
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char* __env_value = getenv(__env_var);
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if (__env_value) {
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long int __converted_value = strtol(__env_value, NULL, 10);
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if (errno || __converted_value < 0) {
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fprintf(stderr, "Bad value for environment variable '%s'.\n", __env_var);
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abort();
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} else {
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return static_cast<size_t>(__converted_value);
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}
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} else {
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return __default_value;
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}
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}
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inline void __set_max_stack_trace_depth()
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{
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_GLIBCXX_PROFILE_DATA(_S_max_stack_depth) = __env_to_size_t(
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_GLIBCXX_PROFILE_MAX_STACK_DEPTH_ENV_VAR,
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_GLIBCXX_PROFILE_DATA(_S_max_stack_depth));
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}
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inline void __set_max_mem()
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{
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_GLIBCXX_PROFILE_DATA(_S_max_mem) = __env_to_size_t(
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_GLIBCXX_PROFILE_MEM_PER_DIAGNOSTIC_ENV_VAR,
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_GLIBCXX_PROFILE_DATA(_S_max_mem));
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}
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inline int __log_magnitude(float __f)
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{
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const float __log_base = 10.0;
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int __result = 0;
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int __sign = 1;
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if (__f < 0) {
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__f = -__f;
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__sign = -1;
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}
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while (__f > __log_base) {
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++__result;
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__f /= 10.0;
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}
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return __sign * __result;
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}
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inline FILE* __open_output_file(const char* __extension)
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{
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// The path is made of _S_trace_file_name + "." + extension.
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size_t __root_len = strlen(_GLIBCXX_PROFILE_DATA(_S_trace_file_name));
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size_t __ext_len = strlen(__extension);
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char* __file_name = new char[__root_len + 1 + __ext_len + 1];
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memcpy(__file_name, _GLIBCXX_PROFILE_DATA(_S_trace_file_name), __root_len);
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*(__file_name + __root_len) = '.';
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memcpy(__file_name + __root_len + 1, __extension, __ext_len + 1);
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FILE* __out_file = fopen(__file_name, "w");
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if (__out_file) {
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return __out_file;
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} else {
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fprintf(stderr, "Could not open trace file '%s'.\n", __file_name);
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abort();
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}
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}
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/** @brief Final report method, registered with @b atexit.
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*
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* This can also be called directly by user code, including signal handlers.
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* It is protected against deadlocks by the reentrance guard in profiler.h.
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* However, when called from a signal handler that triggers while within
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* __gnu_profile (under the guarded zone), no output will be produced.
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*/
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inline void __report(void)
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{
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_GLIBCXX_PROFILE_DATA(__global_lock).lock();
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__warning_vector_t __warnings;
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FILE* __raw_file = __open_output_file("raw");
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__trace_vector_size_report(__raw_file, __warnings);
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__trace_hashtable_size_report(__raw_file, __warnings);
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__trace_hash_func_report(__raw_file, __warnings);
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__trace_vector_to_list_report(__raw_file, __warnings);
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__trace_list_to_slist_report(__raw_file, __warnings);
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__trace_list_to_vector_report(__raw_file, __warnings);
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__trace_map_to_unordered_map_report(__raw_file, __warnings);
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fclose(__raw_file);
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// Sort data by magnitude.
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// XXX: instead of sorting, should collect only top N for better performance.
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size_t __cutoff = std::min(_GLIBCXX_PROFILE_DATA(_S_max_warn_count),
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__warnings.size());
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std::make_heap(__warnings.begin(), __warnings.end(),
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std::greater<__warning_vector_t::value_type>());
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std::sort_heap(__warnings.begin(), __warnings.end(),
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std::greater<__warning_vector_t::value_type>());
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__warnings.resize(__cutoff);
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FILE* __warn_file = __open_output_file("txt");
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for (__warning_vector_t::iterator __it = __warnings.begin();
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__it != __warnings.end(); ++__it)
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{
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fprintf(__warn_file, __it->__warning_id);
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fprintf(__warn_file, ": improvement = %d",
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__log_magnitude(__it->__magnitude));
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fprintf(__warn_file, ": call stack = ");
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__gnu_profile::__write(__warn_file, __it->__context);
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fprintf(__warn_file, ": advice = %s\n", __it->__warning_message);
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free(const_cast<void*>(reinterpret_cast<const void*>
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(__it->__warning_message)));
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}
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fclose(__warn_file);
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_GLIBCXX_PROFILE_DATA(__global_lock).unlock();
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}
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inline void __set_trace_path()
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{
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char* __env_trace_file_name = getenv(_GLIBCXX_PROFILE_TRACE_ENV_VAR);
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if (__env_trace_file_name) {
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_GLIBCXX_PROFILE_DATA(_S_trace_file_name) = __env_trace_file_name;
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}
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// Make sure early that we can create the trace file.
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fclose(__open_output_file("txt"));
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}
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inline void __set_max_warn_count()
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{
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char* __env_max_warn_count_str = getenv(
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_GLIBCXX_PROFILE_MAX_WARN_COUNT_ENV_VAR);
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if (__env_max_warn_count_str) {
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_GLIBCXX_PROFILE_DATA(_S_max_warn_count) = static_cast<size_t>(
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atoi(__env_max_warn_count_str));
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}
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}
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inline void __read_cost_factors()
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{
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std::string __conf_file_name(_GLIBCXX_PROFILE_DATA(_S_trace_file_name));
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__conf_file_name += ".conf";
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std::ifstream __conf_file(__conf_file_name.c_str());
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if (__conf_file.is_open())
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{
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std::string __line;
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while (getline(__conf_file, __line))
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{
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std::string::size_type __i = __line.find_first_not_of(" \t\n\v");
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if (__line.length() <= 0 || __line[__i] == '#') {
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// Skip empty lines or comments.
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continue;
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}
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// Trim.
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if (__line.begin() != __line.end())
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{
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// A simple remove operation.
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std::string::iterator __first = __line.begin();
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std::string::iterator __result = __first;
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++__first;
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for(; __first != __line.end(); ++__first)
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if(!(*__first == ' '))
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{
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*__result = *__first;
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++__result;
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}
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__line.erase(__result, __line.end());
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}
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std::string::size_type __pos = __line.find("=");
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std::string __factor_name = __line.substr(0, __pos);
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std::string::size_type __end = __line.find_first_of(";\n");
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std::string __factor_value = __line.substr(__pos + 1, __end - __pos);
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_GLIBCXX_PROFILE_DATA(__env)[__factor_name] = __factor_value;
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}
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}
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}
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inline void __write_cost_factors()
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{
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FILE* __file = __open_output_file("conf.out");
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for (__decltype(_GLIBCXX_PROFILE_DATA(__cost_factors)->begin()) __it
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= _GLIBCXX_PROFILE_DATA(__cost_factors)->begin();
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__it != _GLIBCXX_PROFILE_DATA(__cost_factors)->end(); ++__it)
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fprintf(__file, "%s = %f\n", (*__it)->__env_var, (*__it)->__value);
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fclose(__file);
|
}
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inline void __set_cost_factors()
|
{
|
_GLIBCXX_PROFILE_DATA(__cost_factors) = new __cost_factor_vector;
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
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&_GLIBCXX_PROFILE_DATA(__vector_shift_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__vector_iterate_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__vector_resize_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__list_shift_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__list_iterate_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__list_resize_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__map_insert_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__map_erase_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__map_find_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__map_iterate_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__umap_insert_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__umap_erase_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__umap_find_cost_factor));
|
_GLIBCXX_PROFILE_DATA(__cost_factors)->push_back(
|
&_GLIBCXX_PROFILE_DATA(__umap_iterate_cost_factor));
|
|
for (__decltype(_GLIBCXX_PROFILE_DATA(__cost_factors)->begin()) __it
|
= _GLIBCXX_PROFILE_DATA(__cost_factors)->begin();
|
__it != _GLIBCXX_PROFILE_DATA(__cost_factors)->end(); ++__it)
|
{
|
const char* __env_cost_factor = getenv((*__it)->__env_var);
|
if (!__env_cost_factor)
|
{
|
__env_t::iterator __found = _GLIBCXX_PROFILE_DATA(__env).find(
|
(*__it)->__env_var);
|
if (__found != _GLIBCXX_PROFILE_DATA(__env).end())
|
__env_cost_factor = (*__found).second.c_str();
|
}
|
if (__env_cost_factor)
|
(*__it)->__value = atof(__env_cost_factor);
|
}
|
}
|
|
inline void __profcxx_init_unconditional()
|
{
|
_GLIBCXX_PROFILE_DATA(__global_lock).lock();
|
|
if (__is_invalid()) {
|
|
__set_max_warn_count();
|
|
if (_GLIBCXX_PROFILE_DATA(_S_max_warn_count) == 0) {
|
|
__turn_off();
|
|
} else {
|
|
__set_max_stack_trace_depth();
|
__set_max_mem();
|
__set_trace_path();
|
__read_cost_factors();
|
__set_cost_factors();
|
__write_cost_factors();
|
|
__trace_vector_size_init();
|
__trace_hashtable_size_init();
|
__trace_hash_func_init();
|
__trace_vector_to_list_init();
|
__trace_list_to_slist_init();
|
__trace_list_to_vector_init();
|
__trace_map_to_unordered_map_init();
|
|
atexit(__report);
|
|
__turn_on();
|
|
}
|
}
|
|
_GLIBCXX_PROFILE_DATA(__global_lock).unlock();
|
}
|
|
/** @brief This function must be called by each instrumentation point.
|
*
|
* The common path is inlined fully.
|
*/
|
inline bool __profcxx_init(void)
|
{
|
if (__is_invalid()) {
|
__profcxx_init_unconditional();
|
}
|
|
return __is_on();
|
}
|
|
} // namespace __gnu_profile
|
|
#endif /* _GLIBCXX_PROFILE_PROFILER_TRACE_H */
|
