[m-rev.] for post-commit review: switches on strings without gotos

[Zoltan Somogyi]

On 16-Aug-2011, Julien Fischer <juliensf at csse.unimelb.edu.au> wrote:
> Based on the output of last night's build on goliath, it does not.
>
> Making Mercury/javas/jmercury/svqueue.java
> Making Mercury/javas/jmercury/svset.java
> Making Mercury/javas/jmercury/svstack.java
> Making Mercury/javas/jmercury/svvarset.java
> Making Mercury/javas/jmercury/table_builtin.java
> Making Mercury/javas/jmercury/table_statistics.java
> Making Mercury/javas/jmercury/term.java
> Uncaught Mercury exception:
> Software Error: ml_backend.mlds_to_java: predicate
> `ml_backend.mlds_to_java.output_binary_op'/3: Unexpected: invalid binary
> operator
> Stack dump not available in this grade.
> ** Error making `Mercury/javas/jmercury/term.java'.

Here is a diff that should fix that error (the unknown operator was str_cmp).

With this diff, tools/bootcheck --grade java --use-mmc-make successfully
compiles the library and the compiler directories, but then dies (with what
looks like an unrelated error) when compiling files in stage2/slice.

Someone who knows the Java/C# backends should fix the XXXs I just added,
and maybe add the string hash operators.

Fixing tools/bootcheck so it can bootcheck in the java grade
would also be nice.

Zoltan.

compiler/mlds_to_java.m:
compiler/mlds_to_cs.m:
	Fix an old bug. When converting MLDS expressions to Java and C#
	respectively, neither files was prepared for the expression to
	contain the str_cmp binary operator. Binary search switches on
	strings use this operator.

	Add an XXX noting how the code for writing out operators in both
	languages should be improved.

compiler/handle_options.m:
	Disable string hash switches for java and for csharp for now,
	since they do not seem to implement the required hash functions.

cvs diff: Diffing .
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cvs diff: Diffing compiler
Index: compiler/handle_options.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/handle_options.m,v
retrieving revision 1.365
diff -u -b -r1.365 handle_options.m
--- compiler/handle_options.m	5 Jul 2011 03:34:31 -0000	1.365
+++ compiler/handle_options.m	18 Aug 2011 05:06:21 -0000
@@ -1303,6 +1303,18 @@
         globals.set_option(allow_multi_arm_switches, bool(no), !Globals)
     ),
 
+    (
+        ( Target = target_csharp
+        ; Target = target_java
+        )
+    ->
+        % Switch off string hash switches until these backends implement
+        % the hash operations.
+        globals.set_option(string_hash_switch_size, int(999999), !Globals)
+    ;
+        true
+    ),
+
     option_implies(target_debug, strip, bool(no), !Globals),
 
     % Profile for implicit parallelism implies a particular coverage
Index: compiler/mlds_to_cs.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/mlds_to_cs.m,v
retrieving revision 1.19
diff -u -b -r1.19 mlds_to_cs.m
--- compiler/mlds_to_cs.m	23 May 2011 05:08:07 -0000	1.19
+++ compiler/mlds_to_cs.m	18 Aug 2011 04:54:14 -0000
@@ -3543,6 +3543,7 @@
     mlds_rval::in, io::di, io::uo) is det.
 
 output_binop(Info, Op, X, Y, !IO) :-
+    % XXX This should be a single complete switch on Op.
     ( Op = array_index(_Type) ->
         output_bracketed_rval(Info, X, !IO),
         io.write_string("[", !IO),
@@ -3564,6 +3565,12 @@
             io.write_string(OpStr, !IO),
             io.write_string(" 0)", !IO)
         )
+    ; Op = str_cmp ->
+        io.write_string("(", !IO),
+        output_rval(Info, X, !IO),
+        io.write_string(".CompareOrdinal(", !IO),
+        output_rval(Info, Y, !IO),
+        io.write_string("))", !IO)
     ;
         io.write_string("(", !IO),
         output_rval(Info, X, !IO),
Index: compiler/mlds_to_java.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/mlds_to_java.m,v
retrieving revision 1.172
diff -u -b -r1.172 mlds_to_java.m
--- compiler/mlds_to_java.m	1 Aug 2011 03:08:19 -0000	1.172
+++ compiler/mlds_to_java.m	18 Aug 2011 04:53:58 -0000
@@ -4913,6 +4913,7 @@
     mlds_rval::in, io::di, io::uo) is det.
 
 output_binop(Info, Op, X, Y, !IO) :-
+    % XXX This should be a single complete switch on Op.
     ( Op = array_index(_Type) ->
         output_bracketed_rval(Info, X, !IO),
         io.write_string("[", !IO),
@@ -4933,6 +4934,12 @@
             io.write_string(OpStr, !IO),
             io.write_string(" 0)", !IO)
         )
+    ; Op = str_cmp ->
+        io.write_string("(", !IO),
+        output_rval(Info, X, !IO),
+        io.write_string(".compareTo(", !IO),
+        output_rval(Info, Y, !IO),
+        io.write_string(")) ", !IO)
     ; rval_is_enum_object(X) ->
         io.write_string("(", !IO),
         output_rval(Info, X, !IO),
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