[m-rev.] diff: fix mantis bug 216

[Zoltan Somogyi]

compile/ml_lookup_switch.m:
	If a lookup switch has no output variables, then do not generate
	a lookup table for it, since it would involve creating a structure
	type with no fields, which Visual C cannot handle. This can happen
	for semidet switches, in which the work is done by range test or
	a bit vector check. An example is char.is_digit.

	The corresponding module for the LLDS backend, lookup_switch.m,
	is already doing this.

Zoltan.

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Index: compiler/ml_lookup_switch.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/ml_lookup_switch.m,v
retrieving revision 1.13
diff -u -b -r1.13 ml_lookup_switch.m
--- compiler/ml_lookup_switch.m	22 Aug 2011 07:56:09 -0000	1.13
+++ compiler/ml_lookup_switch.m	5 Sep 2011 11:41:18 -0000
@@ -239,6 +239,17 @@
     MLDS_Context = mlds_make_context(Context),
     ml_gen_info_get_target(!.Info, Target),
 
+    (
+        OutTypes = [],
+        % There are no output parameters, so there is nothing to look up.
+        % Generating a structure with no fields would cause problems for
+        % Visual C, which cannot handle such structures.
+        %
+        % This should happen only for model_semi switches. If it happens for
+        % a model_det switch, that switch is effectively a no-op.
+        LookupStatements = []
+    ;
+        OutTypes = [_ | _],
     ml_gen_info_get_global_data(!.Info, GlobalData0),
     ml_gen_static_vector_type(MLDS_ModuleName, MLDS_Context, Target,
         OutTypes, StructTypeNum, StructType, FieldIds,
@@ -247,12 +258,13 @@
     ml_construct_simple_switch_vector(ModuleInfo, StructType,
         OutTypes, StartVal, CaseValues, RowInitializers),
 
-    ml_gen_static_vector_defn(MLDS_ModuleName, StructTypeNum, RowInitializers,
-        VectorCommon, GlobalData1, GlobalData),
+        ml_gen_static_vector_defn(MLDS_ModuleName, StructTypeNum,
+            RowInitializers, VectorCommon, GlobalData1, GlobalData),
     ml_gen_info_set_global_data(GlobalData, !Info),
 
     ml_generate_field_assigns(OutVars, OutTypes, FieldIds, VectorCommon,
-        StructType, IndexRval, MLDS_Context, LookupStatements, !Info),
+            StructType, IndexRval, MLDS_Context, LookupStatements, !Info)
+    ),
 
     (
         CodeModel = model_det,
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