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cbcb23d17b
Estimated hours taken: 3
Enable --warn-interface-imports by default. This was turned off while
list and term were defined in mercury_builtin.m, since it caused many
warnings.
Fix all the unused interface imports that have been added since then.
compiler/options.m:
Enable --warn-interface-imports by default.
compiler/module_qual.m:
Fix formatting inconsistencies with module names in warning
messages. (".m" was not appended to module names if there was
only one module).
compiler/*.m:
library/*.m:
tests/invalid/type_loop.m:
tests/warnings/*.m:
Remove usused interface imports, or move them into
implementation (mostly bool, list and std_util).
447 lines
15 KiB
Mathematica
447 lines
15 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% Copyright (C) 1995 University of Melbourne.
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% This file may only be copied under the terms of the GNU General
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% Public License - see the file COPYING in the Mercury distribution.
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%-----------------------------------------------------------------------------%
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%
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% File: livemap.m
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%
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% Main author: zs.
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%
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% This module builds up a map that gives the set of live lvals at each label.
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%-----------------------------------------------------------------------------%
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:- module livemap.
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:- interface.
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:- import_module list, set, map.
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:- import_module llds.
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:- type livemap == map(label, lvalset).
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:- type lvalset == set(lval).
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% Given a list of instructions defining a procedure, return a map
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% giving the set of live non-field lvals at each label.
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%
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% We can compute this set only if the procedure contains no C code.
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:- pred livemap__build(list(instruction), maybe(livemap)).
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:- mode livemap__build(in, out) is det.
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:- implementation.
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:- import_module opt_util.
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:- import_module std_util, require, string, bool.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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% The method we follow is a backward scan of the instruction list,
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% keeping track of the set of live lvals as we go. We update this set
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% at each instruction. When we get to a label, we know that this set
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% of lvals is live at that label.
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%
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% At instructions that can branch away, every lval that is live at
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% any possible target is live before that instruction. Since some
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% branches may be backward branches, we may not have seen the branch
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% target when we process the branch. Therefore we have to repeat the
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% scan, this time with more knowledge about more labels, until we
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% get to a fixpoint.
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livemap__build(Instrs, MaybeLivemap) :-
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map__init(Livemap0),
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list__reverse(Instrs, BackInstrs),
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livemap__build_2(BackInstrs, Livemap0, MaybeLivemap).
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:- pred livemap__build_2(list(instruction), livemap, maybe(livemap)).
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:- mode livemap__build_2(in, in, out) is det.
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livemap__build_2(Backinstrs, Livemap0, MaybeLivemap) :-
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set__init(Livevals0),
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livemap__build_livemap(Backinstrs, Livevals0, no, Ccode1,
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Livemap0, Livemap1),
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( Ccode1 = yes ->
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MaybeLivemap = no
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; livemap__equal_livemaps(Livemap0, Livemap1) ->
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MaybeLivemap = yes(Livemap1)
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;
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livemap__build_2(Backinstrs, Livemap1, MaybeLivemap)
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).
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% Check whether the two livemaps agree on the set of live lvals
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% at every label. They must agree on the set of labels as well.
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% This is important. Livemap1 will be empty in the first call,
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% so agreement only on the set of labels in Livemap1 is useless.
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% The domain of Livemap2 should always be every label in the procedure.
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% as should the domain of Livemap1 in every call after the first.
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:- pred livemap__equal_livemaps(livemap, livemap).
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:- mode livemap__equal_livemaps(in, in) is semidet.
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livemap__equal_livemaps(Livemap1, Livemap2) :-
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map__keys(Livemap1, Labels),
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map__keys(Livemap2, Labels),
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livemap__equal_livemaps_keys(Labels, Livemap1, Livemap2).
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:- pred livemap__equal_livemaps_keys(list(label), livemap, livemap).
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:- mode livemap__equal_livemaps_keys(in, in, in) is semidet.
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livemap__equal_livemaps_keys([], _Livemap1, _Livemap2).
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livemap__equal_livemaps_keys([Label | Labels], Livemap1, Livemap2) :-
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map__lookup(Livemap1, Label, Liveset1),
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map__lookup(Livemap2, Label, Liveset2),
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set__equal(Liveset1, Liveset2),
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livemap__equal_livemaps_keys(Labels, Livemap1, Livemap2).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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% Build up a map of what lvals are live at each label.
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% The input instruction sequence is reversed.
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:- pred livemap__build_livemap(list(instruction), lvalset, bool, bool,
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livemap, livemap).
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:- mode livemap__build_livemap(in, in, in, out, in, out) is det.
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livemap__build_livemap([], _, Ccode, Ccode, Livemap, Livemap).
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livemap__build_livemap([Instr0 | Instrs0], Livevals0, Ccode0, Ccode,
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Livemap0, Livemap) :-
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livemap__build_livemap_instr(Instr0, Instrs0, Instrs1,
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Livevals0, Livevals1, Ccode0, Ccode1, Livemap0, Livemap1),
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livemap__build_livemap(Instrs1, Livevals1,
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Ccode1, Ccode, Livemap1, Livemap).
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:- pred livemap__build_livemap_instr(instruction, list(instruction),
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list(instruction), lvalset, lvalset, bool, bool, livemap, livemap).
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:- mode livemap__build_livemap_instr(in, in, out, in, out, in, out, in, out)
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is det.
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livemap__build_livemap_instr(Instr0, Instrs0, Instrs,
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Livevals0, Livevals, Ccode0, Ccode, Livemap0, Livemap) :-
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Instr0 = Uinstr0 - _,
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(
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Uinstr0 = comment(_),
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Livemap = Livemap0,
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Livevals = Livevals0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = livevals(_),
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error("livevals found in backward scan in build_livemap")
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;
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Uinstr0 = block(_, _, _),
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error("block found in backward scan in build_livemap")
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;
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Uinstr0 = assign(Lval, Rval),
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% Make dead the variable assigned, but make any variables
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% needed to access it live. Make the variables in the assigned
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% expression live as well.
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% The deletion has to be done first. If the assigned-to lval
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% appears on the right hand side as well as the left, then we
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% want make_live to put it back into the liveval set.
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set__delete(Livevals0, Lval, Livevals1),
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opt_util__lval_access_rvals(Lval, Rvals),
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livemap__make_live_in_rvals([Rval | Rvals], Livevals1, Livevals),
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = call(_, _, _, _),
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livemap__look_for_livevals(Instrs0, Instrs,
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Livevals0, Livevals, "call", yes, _),
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Livemap = Livemap0,
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Ccode = Ccode0
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;
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Uinstr0 = mkframe(_, _, _),
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Livemap = Livemap0,
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Livevals = Livevals0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = modframe(_),
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Livemap = Livemap0,
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Livevals = Livevals0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = label(Label),
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map__set(Livemap0, Label, Livevals0, Livemap),
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Livevals = Livevals0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = goto(CodeAddr),
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opt_util__livevals_addr(CodeAddr, LivevalsNeeded),
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livemap__look_for_livevals(Instrs0, Instrs,
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Livevals0, Livevals1, "goto", LivevalsNeeded, Found),
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( Found = yes ->
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Livevals3 = Livevals1
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; CodeAddr = label(Label) ->
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set__init(Livevals2),
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livemap__insert_label_livevals([Label],
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Livemap0, Livevals2, Livevals3)
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;
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( CodeAddr = do_redo
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; CodeAddr = do_fail
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; CodeAddr = do_not_reached
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)
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->
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Livevals3 = Livevals1
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;
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error("unknown label type in build_livemap")
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),
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livemap__special_code_addr(CodeAddr, MaybeSpecial),
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( MaybeSpecial = yes(Special) ->
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set__insert(Livevals3, Special, Livevals)
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;
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Livevals = Livevals3
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),
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Livemap = Livemap0,
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Ccode = Ccode0
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;
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Uinstr0 = computed_goto(Rval, Labels),
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set__init(Livevals1),
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livemap__make_live_in_rvals([Rval], Livevals1, Livevals2),
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livemap__insert_label_livevals(Labels, Livemap0,
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Livevals2, Livevals),
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = c_code(_),
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Livemap = Livemap0,
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Livevals = Livevals0,
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Instrs = Instrs0,
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Ccode = yes
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;
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Uinstr0 = if_val(Rval, CodeAddr),
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livemap__look_for_livevals(Instrs0, Instrs,
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Livevals0, Livevals1, "if_val", no, Found),
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(
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Found = yes,
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% This if_val was put here by middle_rec.
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Livevals3 = Livevals1
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;
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Found = no,
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livemap__make_live_in_rvals([Rval], Livevals1, Livevals2),
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( CodeAddr = label(Label) ->
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livemap__insert_label_livevals([Label],
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Livemap0, Livevals2, Livevals3)
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;
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Livevals3 = Livevals2
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)
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),
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livemap__special_code_addr(CodeAddr, MaybeSpecial),
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( MaybeSpecial = yes(Special) ->
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set__insert(Livevals3, Special, Livevals)
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;
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Livevals = Livevals3
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),
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Livemap = Livemap0,
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Ccode = Ccode0
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;
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Uinstr0 = incr_hp(Lval, _, Rval),
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% Make dead the variable assigned, but make any variables
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% needed to access it live. Make the variables in the size
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% expression live as well.
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% The use of the size expression occurs after the assignment
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% to lval, but the two should never have any variables in
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% common. This is why doing the deletion first works.
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set__delete(Livevals0, Lval, Livevals1),
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opt_util__lval_access_rvals(Lval, Rvals),
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livemap__make_live_in_rvals([Rval | Rvals], Livevals1, Livevals),
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = mark_hp(Lval),
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opt_util__lval_access_rvals(Lval, Rvals),
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livemap__make_live_in_rvals(Rvals, Livevals0, Livevals),
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = restore_hp(Rval),
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livemap__make_live_in_rvals([Rval], Livevals0, Livevals),
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = store_ticket(Lval),
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opt_util__lval_access_rvals(Lval, Rvals),
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livemap__make_live_in_rvals(Rvals, Livevals0, Livevals),
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = restore_ticket(Rval),
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livemap__make_live_in_rvals([Rval], Livevals0, Livevals),
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = discard_ticket,
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Livevals = Livevals0,
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = incr_sp(_, _),
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Livevals = Livevals0,
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = decr_sp(_),
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Livevals = Livevals0,
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Livemap = Livemap0,
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Instrs = Instrs0,
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Ccode = Ccode0
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;
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Uinstr0 = pragma_c(_, _, _, _, _),
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Livemap = Livemap0,
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Livevals = Livevals0,
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Instrs = Instrs0,
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Ccode = yes
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).
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:- pred livemap__look_for_livevals(list(instruction), list(instruction),
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lvalset, lvalset, string, bool, bool).
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:- mode livemap__look_for_livevals(in, out, in, out, in, in, out) is det.
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livemap__look_for_livevals(Instrs0, Instrs, Livevals0, Livevals,
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Site, Compulsory, Found) :-
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opt_util__skip_comments(Instrs0, Instrs1),
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( Instrs1 = [livevals(Livevals1) - _ | Instrs2] ->
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livemap__filter_livevals(Livevals1, Livevals),
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Instrs = Instrs2,
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Found = yes
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; Compulsory = yes ->
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string__append(Site, " not preceded by livevals", Msg),
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error(Msg)
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;
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Instrs = Instrs1,
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Livevals = Livevals0,
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Found = no
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).
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% What lval (if any) is consulted when we branch to a code address?
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:- pred livemap__special_code_addr(code_addr, maybe(lval)).
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:- mode livemap__special_code_addr(in, out) is det.
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livemap__special_code_addr(label(_), no).
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livemap__special_code_addr(imported(_), no).
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livemap__special_code_addr(succip, yes(succip)).
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livemap__special_code_addr(do_succeed(_), yes(succip(lval(curfr)))).
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livemap__special_code_addr(do_redo, yes(redoip(lval(maxfr)))).
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livemap__special_code_addr(do_fail, no).
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livemap__special_code_addr(do_det_closure, no).
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livemap__special_code_addr(do_semidet_closure, no).
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livemap__special_code_addr(do_nondet_closure, no).
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livemap__special_code_addr(do_not_reached, no).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- pred livemap__make_live_in_rvals(list(rval), lvalset, lvalset).
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:- mode livemap__make_live_in_rvals(in, in, out) is det.
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livemap__make_live_in_rvals([], Live, Live).
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livemap__make_live_in_rvals([Rval | Rvals], Live0, Live) :-
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livemap__make_live_in_rval(Rval, Live0, Live1),
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livemap__make_live_in_rvals(Rvals, Live1, Live).
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% Set all lvals found in this rval to live, with the exception of
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% fields, since they are treated specially (the later stages consider
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% them to be live even if they are not explicitly in the live set).
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:- pred livemap__make_live_in_rval(rval, lvalset, lvalset).
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:- mode livemap__make_live_in_rval(in, in, out) is det.
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livemap__make_live_in_rval(lval(Lval), Live0, Live) :-
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% XXX maybe we should treat mem_refs the same way as field refs
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( Lval = field(_, _, _) ->
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Live1 = Live0
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;
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set__insert(Live0, Lval, Live1)
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),
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opt_util__lval_access_rvals(Lval, AccessRvals),
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livemap__make_live_in_rvals(AccessRvals, Live1, Live).
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livemap__make_live_in_rval(create(_, _, _, _), Live, Live).
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% All terms inside creates in the optimizer must be static.
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livemap__make_live_in_rval(mkword(_, Rval), Live0, Live) :-
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livemap__make_live_in_rval(Rval, Live0, Live).
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livemap__make_live_in_rval(const(_), Live, Live).
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livemap__make_live_in_rval(unop(_, Rval), Live0, Live) :-
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livemap__make_live_in_rval(Rval, Live0, Live).
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livemap__make_live_in_rval(binop(_, Rval1, Rval2), Live0, Live) :-
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livemap__make_live_in_rval(Rval1, Live0, Live1),
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livemap__make_live_in_rval(Rval2, Live1, Live).
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livemap__make_live_in_rval(var(_), _, _) :-
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error("var rval should not propagate to the optimizer").
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livemap__make_live_in_rval(mem_addr(MemRef), Live0, Live) :-
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livemap__make_live_in_mem_ref(MemRef, Live0, Live).
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:- pred livemap__make_live_in_mem_ref(mem_ref, lvalset, lvalset).
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:- mode livemap__make_live_in_mem_ref(in, in, out) is det.
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livemap__make_live_in_mem_ref(stackvar_ref(_), Live, Live).
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livemap__make_live_in_mem_ref(framevar_ref(_), Live, Live).
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livemap__make_live_in_mem_ref(heap_ref(Rval, _, _), Live0, Live) :-
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livemap__make_live_in_rval(Rval, Live0, Live).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- pred livemap__filter_livevals(lvalset, lvalset).
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:- mode livemap__filter_livevals(in, out) is det.
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livemap__filter_livevals(Livevals0, Livevals) :-
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set__to_sorted_list(Livevals0, Livelist),
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set__init(Livevals1),
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livemap__insert_proper_livevals(Livelist, Livevals1, Livevals).
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:- pred livemap__insert_label_livevals(list(label), livemap, lvalset, lvalset).
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:- mode livemap__insert_label_livevals(in, in, in, out) is det.
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livemap__insert_label_livevals([], _, Livevals, Livevals).
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livemap__insert_label_livevals([Label | Labels], Livemap, Livevals0, Livevals)
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:-
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( map__search(Livemap, Label, LabelLivevals) ->
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set__to_sorted_list(LabelLivevals, Livelist),
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livemap__insert_proper_livevals(Livelist, Livevals0, Livevals1)
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;
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Livevals1 = Livevals0
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),
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livemap__insert_label_livevals(Labels, Livemap, Livevals1, Livevals).
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|
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:- pred livemap__insert_proper_livevals(list(lval), lvalset, lvalset).
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:- mode livemap__insert_proper_livevals(in, in, out) is det.
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livemap__insert_proper_livevals([], Livevals, Livevals).
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livemap__insert_proper_livevals([Live | Livelist], Livevals0, Livevals) :-
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livemap__insert_proper_liveval(Live, Livevals0, Livevals1),
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livemap__insert_proper_livevals(Livelist, Livevals1, Livevals).
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% Don't insert references to locations on the heap.
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:- pred livemap__insert_proper_liveval(lval, lvalset, lvalset).
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:- mode livemap__insert_proper_liveval(in, in, out) is det.
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livemap__insert_proper_liveval(Live, Livevals0, Livevals) :-
|
|
( Live = field(_, _, _) ->
|
|
Livevals = Livevals0
|
|
;
|
|
set__insert(Livevals0, Live, Livevals)
|
|
).
|
|
|
|
%-----------------------------------------------------------------------------%
|
|
%-----------------------------------------------------------------------------%
|