[m-rev.] diff: detect bad insts in mutables

[Zoltan Somogyi]

compiler/hlds_code_util.m:
	Fix a problem I identified in my previous diff, and which Julien
	confirmed in his review: the inst of a mutable must have ALL its
	parts pass the relevant test, not just SOME.

tests/invalid/bad_mutable.{m,err_exp}:
	Add a mutable whose inst contains as components both ground (which is
	ok in mutables) and unique (which is not ok). The old compiler did not
	generate an error for this mutable; the updated compiler does.

Zoltan.

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cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops
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Index: compiler/hlds_code_util.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/hlds_code_util.m,v
retrieving revision 1.45
diff -u -b -r1.45 hlds_code_util.m
--- compiler/hlds_code_util.m	23 Apr 2012 03:34:47 -0000	1.45
+++ compiler/hlds_code_util.m	23 Apr 2012 03:41:30 -0000
@@ -165,13 +165,7 @@
         Uniq = shared
     ;
         Inst = bound(shared, _, BoundInsts),
-        % XXX This looks wrong to me. It says that Inst is a valid mutable inst
-        % if SOME ArgInst inside Inst is a valid mutable inst, whereas I think
-        % ALL arguments of ALL functors should be required to be valid mutable
-        % insts.
-        list.member(bound_functor(_, ArgInsts), BoundInsts),
-        list.member(ArgInst, ArgInsts),
-        is_valid_mutable_inst_2(ModuleInfo, ArgInst, Expansions0)
+        are_valid_mutable_bound_insts(ModuleInfo, BoundInsts, Expansions0)
     ;
         Inst = defined_inst(InstName),
         not set.member(InstName, Expansions0),
@@ -180,6 +174,24 @@
         is_valid_mutable_inst_2(ModuleInfo, SubInst, Expansions)
     ).
 
+:- pred are_valid_mutable_bound_insts(module_info::in, list(bound_inst)::in,
+    set(inst_name)::in) is semidet.
+
+are_valid_mutable_bound_insts(_ModuleInfo, [], _Expansions0).
+are_valid_mutable_bound_insts(ModuleInfo, [BoundInst | BoundInsts],
+        Expansions0) :-
+    BoundInst = bound_functor(_ConsId, ArgInsts),
+    are_valid_mutable_insts(ModuleInfo, ArgInsts, Expansions0),
+    are_valid_mutable_bound_insts(ModuleInfo, BoundInsts, Expansions0).
+
+:- pred are_valid_mutable_insts(module_info::in, list(mer_inst)::in,
+    set(inst_name)::in) is semidet.
+
+are_valid_mutable_insts(_ModuleInfo, [], _Expansions0).
+are_valid_mutable_insts(ModuleInfo, [Inst | Insts], Expansions0) :-
+    is_valid_mutable_inst_2(ModuleInfo, Inst, Expansions0),
+    are_valid_mutable_insts(ModuleInfo, Insts, Expansions0).
+
 %----------------------------------------------------------------------------%
 :- end_module hlds_code_util.
 %----------------------------------------------------------------------------%
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Index: tests/invalid/bad_mutable.err_exp
===================================================================
RCS file: /home/mercury/mercury1/repository/tests/invalid/bad_mutable.err_exp,v
retrieving revision 1.10
diff -u -b -r1.10 bad_mutable.err_exp
--- tests/invalid/bad_mutable.err_exp	14 Aug 2009 20:37:54 -0000	1.10
+++ tests/invalid/bad_mutable.err_exp	23 Apr 2012 03:46:18 -0000
@@ -17,3 +17,5 @@
 bad_mutable.m:024:   [thread_local, trailed].
 bad_mutable.m:026: Error: conflicting attributes in attribute list:
 bad_mutable.m:026:   [thread_local, constant].
+bad_mutable.m:031: Error: the inst `bound(f1(ground, unique))' is not a valid
+bad_mutable.m:031:   inst for a mutable declaration.
Index: tests/invalid/bad_mutable.m
===================================================================
RCS file: /home/mercury/mercury1/repository/tests/invalid/bad_mutable.m,v
retrieving revision 1.6
diff -u -b -r1.6 bad_mutable.m
--- tests/invalid/bad_mutable.m	15 Jan 2007 02:24:28 -0000	1.6
+++ tests/invalid/bad_mutable.m	23 Apr 2012 03:45:52 -0000
@@ -25,3 +25,7 @@
 
 :- mutable(conflicting_thr_local2, int, 0, ground, [thread_local, constant]).
 
+:- type t1 ---> f1(int, int).
+:- inst t1 ---> f1(ground, unique).
+
+:- mutable(non_ground, t1, f1(41, 43), t1, [untrailed]).
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