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%% -*- erlang-indent-level: 2 -*-
%%======================================================================
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2001-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(hipe_icode_cfg).
-export([bb/2, bb_add/3,
cfg_to_linear/1,
is_closure/1,
closure_arity/1,
linear_to_cfg/1,
labels/1, start_label/1,
pp/1, pp/2,
params/1, params_update/2,
pred/2,
redirect/4,
remove_trivial_bbs/1, remove_unreachable_code/1,
succ/2,
visit/2, is_visited/2, none_visited/0
]).
-export([postorder/1, reverse_postorder/1]).
-define(ICODE_CFG, true). % needed by cfg.inc
%%-define(DO_ASSERT, true).
-include("../main/hipe.hrl").
-include("hipe_icode.hrl").
-include("../flow/hipe_bb.hrl").
-include("../flow/cfg.hrl").
-include("../flow/cfg.inc").
%%----------------------------------------------------------------------
%% Prototypes for exported functions which are Icode specific
%%----------------------------------------------------------------------
-spec labels(cfg()) -> [icode_lbl()].
-spec postorder(cfg()) -> [icode_lbl()].
-spec reverse_postorder(cfg()) -> [icode_lbl()].
-spec is_visited(icode_lbl(), gb_sets:set()) -> boolean().
-spec visit(icode_lbl(), gb_sets:set()) -> gb_sets:set().
-spec bb(cfg(), icode_lbl()) -> 'not_found' | bb().
-spec bb_add(cfg(), icode_lbl(), bb()) -> cfg().
-spec pred(cfg(), icode_lbl()) -> [icode_lbl()].
-spec succ(cfg(), icode_lbl()) -> [icode_lbl()].
-spec redirect(cfg(), icode_lbl(), icode_lbl(), icode_lbl()) -> cfg().
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Interface to Icode
%%
-spec linear_to_cfg(#icode{}) -> cfg().
linear_to_cfg(LinearIcode) ->
%% hipe_icode_pp:pp(Icode),
Code = hipe_icode:icode_code(LinearIcode),
IsClosure = hipe_icode:icode_is_closure(LinearIcode),
StartLabel = hipe_icode:label_name(hd(Code)),
CFG0 = mk_empty_cfg(hipe_icode:icode_fun(LinearIcode),
StartLabel,
hipe_icode:icode_data(LinearIcode),
IsClosure,
hipe_icode:icode_is_leaf(LinearIcode),
hipe_icode:icode_params(LinearIcode)),
CFG1 = info_update(CFG0, hipe_icode:icode_info(LinearIcode)),
CFG2 = case IsClosure of
true ->
closure_arity_update(CFG1,
hipe_icode:icode_closure_arity(LinearIcode));
false ->
CFG1
end,
?opt_start_timer("Get BBs icode"),
FullCFG = take_bbs(Code, CFG2),
?opt_stop_timer("Get BBs icode"),
FullCFG.
%% remove_blocks(CFG, []) ->
%% CFG;
%% remove_blocks(CFG, [Lbl|Lbls]) ->
%% remove_blocks(bb_remove(CFG, Lbl), Lbls).
-spec is_label(icode_instr()) -> boolean().
is_label(Instr) ->
hipe_icode:is_label(Instr).
label_name(Instr) ->
hipe_icode:label_name(Instr).
mk_label(Name) ->
hipe_icode:mk_label(Name).
mk_goto(Name) ->
hipe_icode:mk_goto(Name).
branch_successors(Instr) ->
hipe_icode:successors(Instr).
fails_to(Instr) ->
hipe_icode:fails_to(Instr).
%% True if instr has no effect.
-spec is_comment(icode_instr()) -> boolean().
is_comment(Instr) ->
hipe_icode:is_comment(Instr).
%% True if instr is just a jump (no side-effects).
-spec is_goto(icode_instr()) -> boolean().
is_goto(Instr) ->
hipe_icode:is_goto(Instr).
-spec is_branch(icode_instr()) -> boolean().
is_branch(Instr) ->
hipe_icode:is_branch(Instr).
-spec is_pure_branch(icode_instr()) -> boolean().
is_pure_branch(Instr) ->
case Instr of
#icode_if{} -> true;
#icode_goto{} -> true;
#icode_switch_val{} -> true;
#icode_switch_tuple_arity{} -> true;
#icode_type{} -> true;
%% false cases below -- XXX: are they correct?
#icode_label{} -> false;
#icode_move{} -> false;
#icode_phi{} -> false;
#icode_call{} -> false;
#icode_enter{} -> false;
#icode_return{} -> false;
#icode_begin_try{} -> false;
#icode_end_try{} -> false;
#icode_begin_handler{} -> false;
#icode_fail{} -> false;
#icode_comment{} -> false
end.
-spec is_phi(icode_instr()) -> boolean().
is_phi(I) ->
hipe_icode:is_phi(I).
phi_remove_pred(I, Pred) ->
hipe_icode:phi_remove_pred(I, Pred).
%% phi_redirect_pred(I, OldPred, NewPred) ->
%% hipe_icode:phi_redirect_pred(I, OldPred, NewPred).
redirect_jmp(Jmp, ToOld, ToNew) ->
hipe_icode:redirect_jmp(Jmp, ToOld, ToNew).
redirect_ops(_, CFG, _) -> %% We do not refer to labels in Icode ops.
CFG.
%%----------------------------------------------------------------------------
-spec pp(cfg()) -> 'ok'.
pp(CFG) ->
hipe_icode_pp:pp(cfg_to_linear(CFG)).
-spec pp(io:device(), cfg()) -> 'ok'.
pp(Dev, CFG) ->
hipe_icode_pp:pp(Dev, cfg_to_linear(CFG)).
%%----------------------------------------------------------------------------
-spec cfg_to_linear(cfg()) -> #icode{}.
cfg_to_linear(CFG) ->
Code = linearize_cfg(CFG),
IsClosure = is_closure(CFG),
Icode = hipe_icode:mk_icode(function(CFG),
params(CFG),
IsClosure,
is_leaf(CFG),
Code,
data(CFG),
hipe_gensym:var_range(icode),
hipe_gensym:label_range(icode)),
Icode1 = hipe_icode:icode_info_update(Icode, info(CFG)),
case IsClosure of
true -> hipe_icode:icode_closure_arity_update(Icode1, closure_arity(CFG));
false -> Icode1
end.
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