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Diffstat (limited to 'lib/hipe/misc/hipe_gensym.erl')
| -rw-r--r-- | lib/hipe/misc/hipe_gensym.erl | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/lib/hipe/misc/hipe_gensym.erl b/lib/hipe/misc/hipe_gensym.erl new file mode 100644 index 0000000000..84fc8fa7e8 --- /dev/null +++ b/lib/hipe/misc/hipe_gensym.erl @@ -0,0 +1,244 @@ +%% -*- erlang-indent-level: 2 -*- +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2001-2009. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% +%%======================================================================= +%% File : hipe_gensym.erl +%% Author : Eric Johansson and Kostis Sagonas +%% Description : Generates unique symbols and fresh integer counts. +%%======================================================================= +%% $Id$ +%%======================================================================= +%% Notes: Written while we were in Montreal, Canada for PPDP-2000 as an +%% exercise in Principles and Practice of Declarative Programming! +%%======================================================================= + +-module(hipe_gensym). + +-export([%% init/0, new_var/0, new_label/0, + %% update_lblrange/1, update_vrange/1, var_range/0, label_range/0, + set_var/1, get_var/0, get_next_var/0, + set_label/1, get_label/0, get_next_label/0]). +-export([init/1, new_var/1, new_label/1, + update_vrange/2, update_lblrange/2, var_range/1, label_range/1, + set_var_range/3, set_label_range/3, + set_var/2, get_var/1, get_next_var/1, + set_label/2, get_label/1, get_next_label/1]). + +%%----------------------------------------------------------------------- +%% Types of allowable entities to set global variables for +%%----------------------------------------------------------------------- + +-type gvarname() :: 'icode' | 'rtl' | 'arm' | 'ppc' | 'sparc' | 'x86'. + +%%----------------------------------------------------------------------- + +%% init() -> +%% put(var_count, 0), +%% put(label_count, 0), +%% put(var_min, 0), +%% put(var_max, 0), +%% put(lbl_min, 1), +%% put(lbl_max, 1), +%% ok. + +-spec init(gvarname()) -> 'ok'. + +init(What) -> + put({What,var_count}, 0), + put({What,label_count}, 0), + put({What,var_min}, 0), + put({What,var_max}, 0), + put({What,lbl_min}, 1), + put({What,lbl_max}, 1), + ok. + +%% new_var() -> +%% V = get(var_count), +%% put(var_count, V+1), +%% V. + +-spec new_var(gvarname()) -> non_neg_integer(). + +new_var(What) -> + T = {What, var_count}, + V = get(T), + put(T, V+1), + V. + +%% new_label() -> +%% L = get(label_count), +%% put(label_count, L+1), +%% L. + +-spec new_label(gvarname()) -> non_neg_integer(). + +new_label(What) -> + T = {What, label_count}, + L = get(T), + put(T, L+1), + L. + +%% update_vrange(V) -> +%% Vmax = get(var_max), +%% Vmin = get(var_min), +%% put(var_min, erlang:min(V, Vmin)), +%% put(var_max, erlang:max(V, Vmax)), +%% ok. + +-spec update_vrange(gvarname(), non_neg_integer()) -> 'ok'. +update_vrange(What, V) -> + Tmin = {What, var_min}, + Tmax = {What, var_max}, + Vmax = get(Tmax), + Vmin = get(Tmin), + put(Tmin, erlang:min(V, Vmin)), + put(Tmax, erlang:max(V, Vmax)), + ok. + +%% update_lblrange(L) -> +%% Lmax = get(lbl_max), +%% Lmin = get(lbl_min), +%% put(lbl_min, erlang:min(L, Lmin)), +%% put(lbl_max, erlang:max(L, Lmax)), +%% ok. + +-spec update_lblrange(gvarname(), non_neg_integer()) -> 'ok'. + +update_lblrange(What, L) -> + Tmin = {What, lbl_min}, + Tmax = {What, lbl_max}, + Lmax = get(Tmax), + Lmin = get(Tmin), + put(Tmin, erlang:min(L, Lmin)), + put(Tmax, erlang:max(L, Lmax)), + ok. + +%% var_range() -> +%% {get(var_min), get(var_max)}. + +-spec var_range(gvarname()) -> {non_neg_integer(), non_neg_integer()}. + +var_range(What) -> + {get({What,var_min}), get({What,var_max})}. + +-spec set_var_range(gvarname(), non_neg_integer(), non_neg_integer()) -> 'ok'. + +set_var_range(What, Min, Max) -> + put({What,var_min}, Min), + put({What,var_max}, Max), + ok. + +%% label_range() -> +%% {get(lbl_min), get(lbl_max)}. + +-spec label_range(gvarname()) -> {non_neg_integer(), non_neg_integer()}. + +label_range(What) -> + {get({What,lbl_min}), get({What,lbl_max})}. + +-spec set_label_range(gvarname(), non_neg_integer(), non_neg_integer()) -> 'ok'. + +set_label_range(What, Min, Max) -> + put({What,lbl_min}, Min), + put({What,lbl_max}, Max), + ok. + +%%----------------------------------------------------------------------- +%% Variable counter +%%----------------------------------------------------------------------- + +-spec set_var(non_neg_integer()) -> 'ok'. + +set_var(X) -> + put(var_max, X), + ok. + +-spec set_var(gvarname(), non_neg_integer()) -> 'ok'. + +set_var(What, X) -> + put({What,var_max}, X), + ok. + +-spec get_var() -> non_neg_integer(). + +get_var() -> + get(var_max). + +-spec get_var(gvarname()) -> non_neg_integer(). + +get_var(What) -> + get({What,var_max}). + +-spec get_next_var() -> non_neg_integer(). + +get_next_var() -> + C = get(var_max), + put(var_max, C+1), + C+1. + +-spec get_next_var(gvarname()) -> non_neg_integer(). + +get_next_var(What) -> + T = {What, var_max}, + C = get(T), + put(T, C+1), + C+1. + +%%----------------------------------------------------------------------- +%% Label counter +%%----------------------------------------------------------------------- + +-spec set_label(non_neg_integer()) -> 'ok'. + +set_label(X) -> + put(lbl_max, X), + ok. + +-spec set_label(gvarname(), non_neg_integer()) -> 'ok'. + +set_label(What, X) -> + put({What,lbl_max}, X), + ok. + +-spec get_label() -> non_neg_integer(). + +get_label() -> + get(lbl_max). + +-spec get_label(gvarname()) -> non_neg_integer(). + +get_label(What) -> + get({What,lbl_max}). + +-spec get_next_label() -> non_neg_integer(). + +get_next_label() -> + C = get(lbl_max), + put(lbl_max, C+1), + C+1. + +-spec get_next_label(gvarname()) -> non_neg_integer(). + +get_next_label(What) -> + T = {What, lbl_max}, + C = get(T), + put(T, C+1), + C+1. + +%%----------------------------------------------------------------------- |