%% -*- erlang-indent-level: 2 -*-
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2006-2014. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%-------------------------------------------------------------------
%% File : icode_instruction_counter.erl
%% Author : Andreas Hasselberg <[email protected]>
%% Purpose : This module counts the number of different instructions
%% in a function. It is useful when you want to know if
%% your Icode analysis or specialization is good, bad or
%% simply unlucky :)
%%
%% Created : 2 Oct 2006 by Andreas Hasselberg <[email protected]>
%%-------------------------------------------------------------------
-module(hipe_icode_instruction_counter).
-export([cfg/3, compare/3]).
-include("../main/hipe.hrl").
-include("hipe_icode.hrl").
-include("../flow/cfg.hrl").
%%-------------------------------------------------------------------
%% A general CFG instruction walktrough
%%-------------------------------------------------------------------
-spec cfg(#cfg{}, mfa(), comp_options()) -> [_].
cfg(Cfg, _IcodeFun, _Options) ->
Labels = hipe_icode_cfg:labels(Cfg),
%% Your Info init function goes here
InitInfo = counter__init_info(),
Info = lists:foldl(fun (Label, InfoAcc) ->
BB = hipe_icode_cfg:bb(Cfg, Label),
Code = hipe_bb:code(BB),
walktrough_bb(Code, InfoAcc)
end, InitInfo, Labels),
%% counter__output_info(IcodeFun, Info),
Info.
walktrough_bb(BB, Info) ->
lists:foldl(fun (Insn, InfoAcc) ->
%% Your analysis function here
counter__analys_insn(Insn, InfoAcc)
end, Info, BB).
%%-------------------------------------------------------------------
%% The counter specific functions
%%-------------------------------------------------------------------
-spec compare(gb_trees:tree(), gb_trees:tree(), gb_trees:tree()) ->
gb_trees:tree().
compare(Name, Old, New) ->
NewList = gb_trees:to_list(New),
OldList = gb_trees:to_list(Old),
TempTree = compare_one_way(NewList, Old, added, gb_trees:empty()),
DiffTree = compare_one_way(OldList, New, removed, TempTree),
DiffList = gb_trees:to_list(DiffTree),
if DiffList =:= [] ->
ok;
true ->
io:format("~p: ~p ~n", [Name, DiffList])
end,
DiffTree.
compare_one_way(List, Tree, Key, Fold_tree) ->
lists:foldl(fun({Insn, ListCount}, DiffAcc) when is_integer(ListCount) ->
DiffCount =
case gb_trees:lookup(Insn, Tree) of
{value, TreeCount} when is_integer(TreeCount) ->
ListCount - TreeCount;
none ->
ListCount
end,
if DiffCount > 0 ->
gb_trees:insert({Key, Insn}, DiffCount, DiffAcc);
true ->
DiffAcc
end
end,
Fold_tree,
List).
counter__init_info() ->
gb_trees:empty().
counter__analys_insn(Insn, Info) ->
Key = counter__insn_get_key(Insn),
counter__increase_key(Key, Info).
counter__insn_get_key(If = #icode_if{}) -> {'if', hipe_icode:if_op(If)};
counter__insn_get_key(Call = #icode_call{}) -> {call, hipe_icode:call_fun(Call)};
counter__insn_get_key(#icode_enter{}) -> enter;
counter__insn_get_key(#icode_return{}) -> return;
counter__insn_get_key(#icode_type{}) -> type;
counter__insn_get_key(#icode_switch_val{}) -> switch_val;
counter__insn_get_key(#icode_switch_tuple_arity{}) -> switch_tuple_arity;
counter__insn_get_key(#icode_goto{}) -> goto;
counter__insn_get_key(#icode_move{}) -> move;
counter__insn_get_key(#icode_phi{}) -> phi;
counter__insn_get_key(#icode_begin_try{}) -> begin_try;
counter__insn_get_key(#icode_end_try{}) -> end_try;
counter__insn_get_key(#icode_begin_handler{}) -> begin_handler;
counter__insn_get_key(#icode_fail{}) -> fail;
counter__insn_get_key(#icode_comment{}) -> comment.
counter__increase_key(Key, Info) ->
NewCounter =
case gb_trees:lookup(Key, Info) of
{value, Counter} when is_integer(Counter) ->
Counter + 1;
none ->
1
end,
gb_trees:enter(Key, NewCounter, Info).
%%counter__output_info(IcodeFun, Info) ->
%% InfoList = gb_trees:to_list(Info),
%% io:format("~p instructions : ~p ~n", [IcodeFun, InfoList]).
