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author | Björn Gustavsson <[email protected]> | 2018-08-24 14:39:36 +0200 |
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committer | Björn Gustavsson <[email protected]> | 2018-09-12 14:19:05 +0200 |
commit | 56a6c76f84666e3b1e0336b7eb3dfda15a1ec908 (patch) | |
tree | 7c620769d011f088572a4277ebfe934d2d5a527b /lib/compiler | |
parent | 52abce861178bbce0dc3acb22cc8935f9a434981 (diff) | |
download | otp-56a6c76f84666e3b1e0336b7eb3dfda15a1ec908.tar.gz otp-56a6c76f84666e3b1e0336b7eb3dfda15a1ec908.tar.bz2 otp-56a6c76f84666e3b1e0336b7eb3dfda15a1ec908.zip |
Introduce the beam_jump:instr_labels/1 function
This functionality will soon be needed.
Diffstat (limited to 'lib/compiler')
-rw-r--r-- | lib/compiler/src/beam_jump.erl | 120 |
1 files changed, 69 insertions, 51 deletions
diff --git a/lib/compiler/src/beam_jump.erl b/lib/compiler/src/beam_jump.erl index 42b4cdaf4f..06f3cc19bb 100644 --- a/lib/compiler/src/beam_jump.erl +++ b/lib/compiler/src/beam_jump.erl @@ -23,7 +23,7 @@ -export([module/2, is_unreachable_after/1,is_exit_instruction/1, - remove_unused_labels/1]). + remove_unused_labels/1,instr_labels/1]). %%% The following optimisations are done: %%% @@ -571,58 +571,76 @@ drop_upto_label([{label,_}|_]=Is) -> Is; drop_upto_label([_|Is]) -> drop_upto_label(Is); drop_upto_label([]) -> []. -%% ulbl(Instruction, UsedGbSet) -> UsedGbSet' -%% Update the gb_set UsedGbSet with any function-local labels +%% ulbl(Instruction, UsedCerlSet) -> UsedCerlSet' +%% Update the cerl_set UsedCerlSet with any function-local labels %% (i.e. not with labels in call instructions) referenced by %% the instruction Instruction. %% %% NOTE: This function does NOT look for labels inside blocks. -ulbl({test,_,Fail,_}, Used) -> - mark_used(Fail, Used); -ulbl({test,_,Fail,_,_,_}, Used) -> - mark_used(Fail, Used); -ulbl({select,_,_,Fail,Vls}, Used) -> - mark_used_list(Vls, mark_used(Fail, Used)); -ulbl({'try',_,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl({'catch',_,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl({jump,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl({loop_rec,Lbl,_}, Used) -> - mark_used(Lbl, Used); -ulbl({loop_rec_end,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl({wait,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl({wait_timeout,Lbl,_To}, Used) -> - mark_used(Lbl, Used); -ulbl({bif,_Name,Lbl,_As,_R}, Used) -> - mark_used(Lbl, Used); -ulbl({gc_bif,_Name,Lbl,_Live,_As,_R}, Used) -> - mark_used(Lbl, Used); -ulbl({bs_init,Lbl,_,_,_,_}, Used) -> - mark_used(Lbl, Used); -ulbl({bs_put,Lbl,_,_}, Used) -> - mark_used(Lbl, Used); -ulbl({put_map,Lbl,_Op,_Src,_Dst,_Live,_List}, Used) -> - mark_used(Lbl, Used); -ulbl({get_map_elements,Lbl,_Src,_List}, Used) -> - mark_used(Lbl, Used); -ulbl({recv_mark,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl({recv_set,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl({fcheckerror,Lbl}, Used) -> - mark_used(Lbl, Used); -ulbl(_, Used) -> Used. - -mark_used({f,0}, Used) -> Used; -mark_used({f,L}, Used) -> cerl_sets:add_element(L, Used). - -mark_used_list([{f,L}|T], Used) -> - mark_used_list(T, cerl_sets:add_element(L, Used)); -mark_used_list([_|T], Used) -> - mark_used_list(T, Used); -mark_used_list([], Used) -> Used. +ulbl(I, Used) -> + case instr_labels(I) of + [] -> + Used; + [Lbl] -> + cerl_sets:add_element(Lbl, Used); + [_|_]=L -> + ulbl_list(L, Used) + end. + +ulbl_list([L|Ls], Used) -> + ulbl_list(Ls, cerl_sets:add_element(L, Used)); +ulbl_list([], Used) -> Used. + +-spec instr_labels(Instruction) -> Labels when + Instruction :: instruction(), + Labels :: [beam_asm:label()]. + +instr_labels({test,_,Fail,_}) -> + do_instr_labels(Fail); +instr_labels({test,_,Fail,_,_,_}) -> + do_instr_labels(Fail); +instr_labels({select,_,_,Fail,Vls}) -> + do_instr_labels_list(Vls, do_instr_labels(Fail)); +instr_labels({'try',_,Lbl}) -> + do_instr_labels(Lbl); +instr_labels({'catch',_,Lbl}) -> + do_instr_labels(Lbl); +instr_labels({jump,Lbl}) -> + do_instr_labels(Lbl); +instr_labels({loop_rec,Lbl,_}) -> + do_instr_labels(Lbl); +instr_labels({loop_rec_end,Lbl}) -> + do_instr_labels(Lbl); +instr_labels({wait,Lbl}) -> + do_instr_labels(Lbl); +instr_labels({wait_timeout,Lbl,_To}) -> + do_instr_labels(Lbl); +instr_labels({bif,_Name,Lbl,_As,_R}) -> + do_instr_labels(Lbl); +instr_labels({gc_bif,_Name,Lbl,_Live,_As,_R}) -> + do_instr_labels(Lbl); +instr_labels({bs_init,Lbl,_,_,_,_}) -> + do_instr_labels(Lbl); +instr_labels({bs_put,Lbl,_,_}) -> + do_instr_labels(Lbl); +instr_labels({put_map,Lbl,_Op,_Src,_Dst,_Live,_List}) -> + do_instr_labels(Lbl); +instr_labels({get_map_elements,Lbl,_Src,_List}) -> + do_instr_labels(Lbl); +instr_labels({recv_mark,Lbl}) -> + do_instr_labels(Lbl); +instr_labels({recv_set,Lbl}) -> + do_instr_labels(Lbl); +instr_labels({fcheckerror,Lbl}) -> + do_instr_labels(Lbl); +instr_labels(_) -> []. + +do_instr_labels({f,0}) -> []; +do_instr_labels({f,F}) -> [F]. + +do_instr_labels_list([{f,F}|T], Acc) -> + do_instr_labels_list(T, [F|Acc]); +do_instr_labels_list([_|T], Acc) -> + do_instr_labels_list(T, Acc); +do_instr_labels_list([], Acc) -> Acc. |