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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.
%%%
%%% compute def/use sets for x86 insns
%%%
%%% TODO:
%%% - represent EFLAGS (condition codes) use/def by a virtual reg?
%%% - should push use/def %esp?
-ifdef(HIPE_AMD64).
-define(HIPE_X86_DEFUSE, hipe_amd64_defuse).
-define(HIPE_X86_REGISTERS, hipe_amd64_registers).
-define(RV, rax).
-else.
-define(HIPE_X86_DEFUSE, hipe_x86_defuse).
-define(HIPE_X86_REGISTERS, hipe_x86_registers).
-define(RV, eax).
-endif.
-module(?HIPE_X86_DEFUSE).
-export([insn_def/1, insn_defs_all/1, insn_use/1]). %% src_use/1]).
-include("../x86/hipe_x86.hrl").
%%%
%%% insn_def(Insn) -- Return set of temps defined by an instruction.
%%%
insn_def(I) ->
case I of
#alu{dst=Dst} -> dst_def(Dst);
#cmovcc{dst=Dst} -> dst_def(Dst);
#fmove{dst=Dst} -> dst_def(Dst);
#fp_binop{dst=Dst} -> dst_def(Dst);
#fp_unop{arg=Arg} -> dst_def(Arg);
#imul{temp=Temp} -> [Temp];
#lea{temp=Temp} -> [Temp];
#move{dst=Dst} -> dst_def(Dst);
#move64{dst=Dst} -> dst_def(Dst);
#movsx{dst=Dst} -> dst_def(Dst);
#movzx{dst=Dst} -> dst_def(Dst);
#pseudo_call{} -> call_clobbered();
#pseudo_spill{} -> [];
#pseudo_spill_fmove{temp=Temp, dst=Dst} -> [Temp, Dst];
#pseudo_spill_move{temp=Temp, dst=Dst} -> [Temp, Dst];
#pseudo_tailcall_prepare{} -> tailcall_clobbered();
#shift{dst=Dst} -> dst_def(Dst);
%% call, cmp, comment, jcc, jmp_fun, jmp_label, jmp_switch, label
%% pseudo_jcc, pseudo_tailcall, push, ret, test
_ -> []
end.
%% @doc Answers whether instruction I defines all allocatable registers. Used by
%% hipe_regalloc_prepass.
-spec insn_defs_all(_) -> boolean().
insn_defs_all(I) ->
case I of
#pseudo_call{} -> true;
_ -> false
end.
dst_def(Dst) ->
case Dst of
#x86_temp{} -> [Dst];
#x86_fpreg{} -> [Dst];
_ -> []
end.
call_clobbered() ->
[hipe_x86:mk_temp(R, T)
|| {R,T} <- ?HIPE_X86_REGISTERS:call_clobbered()].
tailcall_clobbered() ->
[hipe_x86:mk_temp(R, T)
|| {R,T} <- ?HIPE_X86_REGISTERS:tailcall_clobbered()].
%%%
%%% insn_use(Insn) -- Return set of temps used by an instruction.
%%%
insn_use(I) ->
case I of
#alu{src=Src,dst=Dst} -> addtemp(Src, addtemp(Dst, []));
#call{'fun'=Fun} -> addtemp(Fun, []);
#cmovcc{src=Src, dst=Dst} -> addtemp(Src, dst_use(Dst));
#cmp{src=Src, dst=Dst} -> addtemp(Src, addtemp(Dst, []));
#fmove{src=Src,dst=Dst} -> addtemp(Src, dst_use(Dst));
#fp_unop{arg=Arg} -> addtemp(Arg, []);
#fp_binop{src=Src,dst=Dst} -> addtemp(Src, addtemp(Dst, []));
#imul{imm_opt=ImmOpt,src=Src,temp=Temp} ->
addtemp(Src, case ImmOpt of [] -> addtemp(Temp, []); _ -> [] end);
#jmp_fun{'fun'=Fun} -> addtemp(Fun, []);
#jmp_switch{temp=Temp, jtab=JTab} -> addtemp(Temp, addtemp(JTab, []));
#lea{mem=Mem} -> addtemp(Mem, []);
#move{src=Src,dst=Dst} -> addtemp(Src, dst_use(Dst));
#move64{} -> [];
#movsx{src=Src,dst=Dst} -> addtemp(Src, dst_use(Dst));
#movzx{src=Src,dst=Dst} -> addtemp(Src, dst_use(Dst));
#pseudo_call{'fun'=Fun,sdesc=#x86_sdesc{arity=Arity}} ->
addtemp(Fun, arity_use(Arity));
#pseudo_spill{args=Args} -> Args;
#pseudo_spill_fmove{src=Src} -> [Src];
#pseudo_spill_move{src=Src} -> [Src];
#pseudo_tailcall{'fun'=Fun,arity=Arity,stkargs=StkArgs} ->
addtemp(Fun, addtemps(StkArgs, addtemps(tailcall_clobbered(),
arity_use(Arity))));
#push{src=Src} -> addtemp(Src, []);
#ret{} -> [hipe_x86:mk_temp(?HIPE_X86_REGISTERS:?RV(), 'tagged')];
#shift{src=Src,dst=Dst} -> addtemp(Src, addtemp(Dst, []));
#test{src=Src, dst=Dst} -> addtemp(Src, addtemp(Dst, []));
%% comment, jcc, jmp_label, label, pseudo_jcc, pseudo_tailcall_prepare
_ -> []
end.
arity_use(Arity) ->
[hipe_x86:mk_temp(R, 'tagged')
|| R <- ?HIPE_X86_REGISTERS:args(Arity)].
dst_use(Dst) ->
case Dst of
#x86_mem{base=Base,off=Off} -> addbase(Base, addtemp(Off, []));
_ -> []
end.
%%%
%%% src_use(Src) -- Return set of temps used by a source operand.
%%%
%% src_use(Src) ->
%% addtemp(Src, []).
%%%
%%% Auxiliary operations on sets of temps
%%%
addtemps([Arg|Args], Set) ->
addtemps(Args, addtemp(Arg, Set));
addtemps([], Set) ->
Set.
addtemp(Arg, Set) ->
case Arg of
#x86_temp{} -> add(Arg, Set);
#x86_mem{base=Base,off=Off} -> addtemp(Off, addbase(Base, Set));
#x86_fpreg{} -> add(Arg, Set);
_ -> Set
end.
addbase(Base, Set) ->
case Base of
[] -> Set;
_ -> addtemp(Base, Set)
end.
add(Arg, Set) ->
case lists:member(Arg, Set) of
false -> [Arg|Set];
_ -> Set
end.
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