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authorGravatar Adam Chlipala <adamc@hcoop.net>2008-07-03 18:06:52 -0400
committerGravatar Adam Chlipala <adamc@hcoop.net>2008-07-03 18:06:52 -0400
commit8d4e252a0d4ac2c89805cd2785f79572cdfe7d82 (patch)
treeb40a8f79d41cd6fe1faebbca7aa44489fbaf0d42 /src/mono_opt.sml
parentb11edd2101e896dd0482715686712b67f00d3099 (diff)
Mono optimizations (start with string concat and space eating)
Diffstat (limited to 'src/mono_opt.sml')
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+(* Copyright (c) 2008, Adam Chlipala
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * - The names of contributors may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+structure MonoOpt :> MONO_OPT = struct
+
+open Mono
+structure U = MonoUtil
+
+fun typ t = t
+fun decl d = d
+
+fun exp e =
+ case e of
+ EPrim (Prim.String s) =>
+ let
+ val (_, chs) =
+ CharVector.foldl (fn (ch, (lastSpace, chs)) =>
+ let
+ val isSpace = Char.isSpace ch
+ in
+ if isSpace andalso lastSpace then
+ (true, chs)
+ else
+ (isSpace, ch :: chs)
+ end)
+ (false, []) s
+ in
+ EPrim (Prim.String (String.implode (rev chs)))
+ end
+
+
+ | EStrcat ((EPrim (Prim.String s1), loc), (EPrim (Prim.String s2), _)) =>
+ let
+ val s =
+ if size s1 > 0 andalso size s2 > 0
+ andalso Char.isSpace (String.sub (s1, size s1 - 1))
+ andalso Char.isSpace (String.sub (s2, 0)) then
+ s1 ^ String.extract (s2, 1, NONE)
+ else
+ s1 ^ s2
+ in
+ EPrim (Prim.String s)
+ end
+ | _ => e
+
+val optimize = U.File.map {typ = typ, exp = exp, decl = decl}
+
+end