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%% -*- erlang-indent-level: 2 -*-
%%
%% 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.
-module(hipe_arm_cfg).
-export([init/1,
labels/1, start_label/1,
succ/2,
map_bbs/2, fold_bbs/3,
bb/2, bb_add/3]).
-export([postorder/1]).
-export([linearise/1]).
-export([params/1, reverse_postorder/1]).
-export([arity/1]). % for linear scan
%%-export([redirect_jmp/3]).
-export([branch_preds/1]).
%%% these tell cfg.inc what to define (ugly as hell)
-define(BREADTH_ORDER,true). % for linear scan
-define(PARAMS_NEEDED,true).
-define(START_LABEL_UPDATE_NEEDED,true).
-define(MAP_FOLD_NEEDED,true).
-include("hipe_arm.hrl").
-include("../flow/cfg.hrl").
-include("../flow/cfg.inc").
init(Defun) ->
Code = hipe_arm:defun_code(Defun),
StartLab = hipe_arm:label_label(hd(Code)),
Data = hipe_arm:defun_data(Defun),
IsClosure = hipe_arm:defun_is_closure(Defun),
Name = hipe_arm:defun_mfa(Defun),
IsLeaf = hipe_arm:defun_is_leaf(Defun),
Formals = hipe_arm:defun_formals(Defun),
CFG0 = mk_empty_cfg(Name, StartLab, Data, IsClosure, IsLeaf, Formals),
take_bbs(Code, CFG0).
is_branch(I) ->
case I of
#b_fun{} -> true;
#b_label{'cond'='al'} -> true;
#pseudo_bc{} -> true;
#pseudo_blr{} -> true;
#pseudo_bx{} -> true;
#pseudo_call{} -> true;
#pseudo_switch{} -> true;
#pseudo_tailcall{} -> true;
_ -> false
end.
branch_successors(Branch) ->
case Branch of
#b_fun{} -> [];
#b_label{'cond'='al',label=Label} -> [Label];
#pseudo_bc{true_label=TrueLab,false_label=FalseLab} -> [FalseLab,TrueLab];
#pseudo_blr{} -> [];
#pseudo_bx{} -> [];
#pseudo_call{contlab=ContLab, sdesc=#arm_sdesc{exnlab=ExnLab}} ->
case ExnLab of
[] -> [ContLab];
_ -> [ContLab,ExnLab]
end;
#pseudo_switch{labels=Labels} -> Labels;
#pseudo_tailcall{} -> []
end.
branch_preds(Branch) ->
case Branch of
#pseudo_bc{true_label=TrueLab,false_label=FalseLab,pred=Pred} ->
[{FalseLab, 1.0-Pred}, {TrueLab, Pred}];
#pseudo_call{contlab=ContLab, sdesc=#arm_sdesc{exnlab=[]}} ->
%% A function can still cause an exception, even if we won't catch it
[{ContLab, 1.0-hipe_bb_weights:call_exn_pred()}];
#pseudo_call{contlab=ContLab, sdesc=#arm_sdesc{exnlab=ExnLab}} ->
CallExnPred = hipe_bb_weights:call_exn_pred(),
[{ContLab, 1.0-CallExnPred}, {ExnLab, CallExnPred}];
#pseudo_switch{labels=Labels} ->
Prob = 1.0/length(Labels),
[{L, Prob} || L <- Labels];
_ ->
case branch_successors(Branch) of
[] -> [];
[Single] -> [{Single, 1.0}]
end
end.
-ifdef(REMOVE_TRIVIAL_BBS_NEEDED).
fails_to(_Instr) -> [].
-endif.
-ifdef(notdef).
redirect_jmp(I, Old, New) ->
case I of
#b_label{label=Label} ->
if Old =:= Label -> I#b_label{label=New};
true -> I
end;
#pseudo_bc{true_label=TrueLab, false_label=FalseLab} ->
I1 = if Old =:= TrueLab -> I#pseudo_bc{true_label=New};
true -> I
end,
if Old =:= FalseLab -> I1#pseudo_bc{false_label=New};
true -> I1
end;
%% handle pseudo_call too?
_ -> I
end.
-endif.
mk_goto(Label) ->
hipe_arm:mk_b_label(Label).
is_label(I) ->
hipe_arm:is_label(I).
label_name(Label) ->
hipe_arm:label_label(Label).
mk_label(Name) ->
hipe_arm:mk_label(Name).
linearise(CFG) -> % -> defun, not insn list
MFA = function(CFG),
Formals = params(CFG),
Code = linearize_cfg(CFG),
Data = data(CFG),
VarRange = hipe_gensym:var_range(arm),
LabelRange = hipe_gensym:label_range(arm),
IsClosure = is_closure(CFG),
IsLeaf = is_leaf(CFG),
hipe_arm:mk_defun(MFA, Formals, IsClosure, IsLeaf,
Code, Data, VarRange, LabelRange).
arity(CFG) ->
{_M, _F, A} = function(CFG),
A.
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