[m-rev.] for post-commit review: fix deep profiling problem

Zoltan Somogyi zs at csse.unimelb.edu.au
Mon Nov 3 17:10:16 AEDT 2008

A temporary fix for Mantis bug #87, which caused all programs compiled with
deep profiling to get a sanity check violation when writing out the deep
profiling data.

My detective work tracked the first reported call site that got this violation,
which is in integer.m in the library, where the predicate integer.to_string
calls the function string.++.

(a) String.++ is marked (correctly) as opt_imported.
(b) The test predicate pred_info_is_imported FAILS for opt_imported predicates.
(c) This causes make_rtti_proc_label to put "no" into the pred_is_imported
    field of the rtti_proc_label for string.++.
(d) This rtti_proc_label is put into the element of the call_site_static_data
    list for integer.to_string that corresponds to the call to string.++
    as the rtti_proc_label of the callee.
(e) When the time comes to write out the call_site_static structures,
    layout_out.m invokes make_proc_label_from_rtti to convert this
    rtti_proc_label in the call_site_static_data to a plain, non-RTTI
    proc_label. However, since the current module name ("integer") does not
    match the name of the module that defines the function ("string") AND
    the function is not marked as imported, make_user_proc_label (invoked
    from make_proc_label_from_rtti) believes that this means that this module
    generates code for the callee (as we do for some opt_imported procedures).
(f) For procedures for which we generate target code in a different module
    than their defining module, we generate different labels for them
    than the label for the code for the procedure in its own module.
    We derive the name of a procedure's proc_static structure directly from
    its label, so this difference holds for the names of proc_static structures
    as well as for labels.
(g) This lead to the problem, which was that the call_site_static for this call
    site referred to the proc_static for string.++ defined in integer.c
    (as opposed to string.++ defined in string.c), since integer.c did not
    actually generate code for string.++, there was no such proc_static.
    This should be a link error, but it isn't, due to the requirement on unix
    linkers of being compatible with Fortran's ancient semantics (specifically,
    Fortran's common areas). Instead, the C compiler happily allocates memory
    for the undefined symbol and fills it with zeros as if it were a
    proc_static structure.
(h) The assertion violation in mercury_deep_profiling.c occurs because the
    call_site_static refers to this bogus proc_static, but of course no module
    writes out this proc_static.

It turns out that deep_profiling.m and the code generator both use the same
algorithm to turn the pred_proc_id of string.++ into a label, but the relevant
input to this algorithm, the import_status of string.++, changes between
the invocation of the deep_profiling transformation and the code generator.
The import_status is changed by the dead procedure elimination pass;
it shouldn't be, but it is. The reason why the bug started showing up recently
is my recent diff that moved the dead_procedure elimination pass after the deep
profiling pass.

The temporary fix is to make sure that the deep profiling pass sees the same
status for each procedure as the code generator, by making it invoke the dead
procedure elimination pass itself.

The right fix is to change the representation of import_status, designing it
properly for the first time, but that will take more time. This redesign should
eliminate the need for the dead procedure eliminate pass to change any

	Make the fix described above.

	Print progress message only with -V, not -v, since this is what
	all the other passes do.

	When writing out a procedure's deep profiling information, include
	the data structures from which we later construct the procedure's
	proc_static and call_site_static structures.

	Replace some if-then-elses with switches.

	Don't export a function that is not used anywhere else.

	Delete a predicate to avoid an ambiguity.


cvs diff: Diffing .
cvs diff: Diffing analysis
cvs diff: Diffing bindist
cvs diff: Diffing boehm_gc
cvs diff: Diffing boehm_gc/Mac_files
cvs diff: Diffing boehm_gc/cord
cvs diff: Diffing boehm_gc/cord/private
cvs diff: Diffing boehm_gc/doc
cvs diff: Diffing boehm_gc/include
cvs diff: Diffing boehm_gc/include/private
cvs diff: Diffing boehm_gc/libatomic_ops-1.2
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/doc
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops/sysdeps
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops/sysdeps/gcc
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops/sysdeps/hpc
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops/sysdeps/ibmc
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops/sysdeps/icc
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops/sysdeps/msftc
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/src/atomic_ops/sysdeps/sunc
cvs diff: Diffing boehm_gc/libatomic_ops-1.2/tests
cvs diff: Diffing boehm_gc/tests
cvs diff: Diffing boehm_gc/windows-untested
cvs diff: Diffing boehm_gc/windows-untested/vc60
cvs diff: Diffing boehm_gc/windows-untested/vc70
cvs diff: Diffing boehm_gc/windows-untested/vc71
cvs diff: Diffing browser
cvs diff: Diffing bytecode
cvs diff: Diffing compiler
Index: compiler/code_util.m
RCS file: /home/mercury/mercury1/repository/mercury/compiler/code_util.m,v
retrieving revision 1.184
diff -u -b -r1.184 code_util.m
--- compiler/code_util.m	3 Sep 2008 03:32:18 -0000	1.184
+++ compiler/code_util.m	2 Nov 2008 00:44:46 -0000
@@ -108,10 +108,13 @@
     ProcAddr = make_entry_label_from_rtti(RttiProcLabel, Immed).
 make_entry_label_from_rtti(RttiProcLabel, Immed) = ProcAddr :-
-    ( RttiProcLabel ^ proc_is_imported = yes ->
+    ProcIsImported = RttiProcLabel ^ proc_is_imported,
+    (
+        ProcIsImported = yes,
         ProcLabel = make_proc_label_from_rtti(RttiProcLabel),
         ProcAddr = code_imported_proc(ProcLabel)
+        ProcIsImported = no,
         Label = make_local_entry_label_from_rtti(RttiProcLabel, Immed),
         ProcAddr = code_label(Label)
@@ -129,9 +132,12 @@
         % If we want to define the label or use it to put it into a data
         % structure, a label that is usable only within the current C module
         % won't do.
-        ( RttiProcLabel ^ proc_is_exported = yes ->
+        ProcIsExported = RttiProcLabel ^ proc_is_exported,
+        (
+            ProcIsExported = yes,
             EntryType = entry_label_exported
+            ProcIsExported = no,
             EntryType = entry_label_local
         Label = entry_label(EntryType, ProcLabel)
Index: compiler/deep_profiling.m
RCS file: /home/mercury/mercury1/repository/mercury/compiler/deep_profiling.m,v
retrieving revision 1.91
diff -u -b -r1.91 deep_profiling.m
--- compiler/deep_profiling.m	11 Oct 2008 02:44:13 -0000	1.91
+++ compiler/deep_profiling.m	2 Nov 2008 01:31:14 -0000
@@ -52,6 +52,7 @@
 :- import_module parse_tree.prog_data.
 :- import_module parse_tree.prog_type.
 :- import_module transform_hlds.
+:- import_module transform_hlds.dead_proc_elim.
 :- import_module transform_hlds.dependency_graph.
 :- import_module assoc_list.
@@ -74,6 +75,11 @@
 apply_deep_profiling_transformation(!ModuleInfo, !IO) :-
+    % XXX The dead proc elimination pass changes the status of opt_imported
+    % predicates, which changes what labels they get generated. The
+    % call_site_static structures we generate must match the labels created
+    % during code generation.
+    dead_proc_elim(elim_opt_imported, !ModuleInfo, _ElimSpecs),
     module_info_get_globals(!.ModuleInfo, Globals),
     globals.lookup_bool_option(Globals, deep_profile_tail_recursion,
@@ -482,10 +488,10 @@
         module_info_get_globals(ModuleInfo, Globals),
-        globals.lookup_bool_option(Globals, verbose, Verbose),
+        globals.lookup_bool_option(Globals, very_verbose, VeryVerbose),
         ProcName = pred_proc_id_pair_to_string(ModuleInfo, PredId, ProcId),
-        maybe_write_string(Verbose,
-            string.format("Deep profiling: %s\n", [s(ProcName)]),
+        maybe_write_string(VeryVerbose,
+            string.format("%% Deep profiling: %s\n", [s(ProcName)]),
         deep_prof_transform_proc(ModuleInfo, proc(PredId, ProcId),
             ProcInfo0, ProcInfo),
Index: compiler/hlds_out.m
RCS file: /home/mercury/mercury1/repository/mercury/compiler/hlds_out.m,v
retrieving revision 1.458
diff -u -b -r1.458 hlds_out.m
--- compiler/hlds_out.m	18 Sep 2008 12:41:54 -0000	1.458
+++ compiler/hlds_out.m	30 Oct 2008 13:46:30 -0000
@@ -4144,7 +4144,8 @@
             MaybeDeepLayout = yes(DeepLayout),
-            DeepLayout = hlds_deep_layout(_, ExcpVars),
+            DeepLayout = hlds_deep_layout(ProcStatic, ExcpVars),
+            write_hlds_proc_static(ProcStatic, !IO),
             ExcpVars = hlds_deep_excp_vars(TopCSD, MiddleCSD,
             io.write_string("% deep layout info: ", !IO),
@@ -4241,6 +4242,74 @@
+:- pred write_hlds_proc_static(hlds_proc_static::in, io::di, io::uo) is det.
+write_hlds_proc_static(ProcStatic, !IO) :-
+    ProcStatic = hlds_proc_static(FileName, LineNumber,
+        InInterface, CallSiteStatics, CoveragePoints),
+    io.write_string("% proc static filename: ", !IO),
+    io.write_string(FileName, !IO),
+    io.nl(!IO),
+    io.write_string("% proc static line number: ", !IO),
+    io.write_int(LineNumber, !IO),
+    io.nl(!IO),
+    io.write_string("% proc static is interface: ", !IO),
+    io.write(InInterface, !IO),
+    io.nl(!IO),
+    list.foldl2(write_hlds_ps_call_site, CallSiteStatics, 0, _, !IO),
+    list.foldl2(write_hlds_ps_coverage_point, CoveragePoints, 0, _, !IO).
+:- pred write_hlds_ps_call_site(call_site_static_data::in, int::in, int::out,
+    io::di, io::uo) is det.
+write_hlds_ps_call_site(CallSiteStaticData, !SlotNum, !IO) :-
+    io.format("%% call site static slot %d\n", [i(!.SlotNum)], !IO),
+    (
+        CallSiteStaticData = normal_call(CalleeRttiProcLabel, TypeSubst,
+            FileName, LineNumber, GoalPath),
+        io.write_string("% normal call to ", !IO),
+        io.write(CalleeRttiProcLabel, !IO),
+        io.nl(!IO),
+        io.format("%% type subst <%s>, goal path <%s>\n",
+            [s(TypeSubst), s(goal_path_to_string(GoalPath))], !IO),
+        io.format("%% filename <%s>, line number <%d>\n",
+            [s(FileName), i(LineNumber)], !IO)
+    ;
+        (
+            CallSiteStaticData = special_call(FileName, LineNumber, GoalPath),
+            io.write_string("% special call\n", !IO)
+        ;
+            CallSiteStaticData = higher_order_call(FileName, LineNumber,
+                GoalPath),
+            io.write_string("% higher order call\n", !IO)
+        ;
+            CallSiteStaticData = method_call(FileName, LineNumber, GoalPath),
+            io.write_string("% method call\n", !IO)
+        ;
+            CallSiteStaticData = callback(FileName, LineNumber, GoalPath),
+            io.write_string("% callback\n", !IO)
+        ),
+        io.format("%% filename <%s>, line number <%d>, goal path <%s>\n",
+            [s(FileName), i(LineNumber), s(goal_path_to_string(GoalPath))],
+            !IO)
+    ),
+    !:SlotNum = !.SlotNum + 1.
+:- pred write_hlds_ps_coverage_point(coverage_point_info::in,
+    int::in, int::out, io::di, io::uo) is det.
+write_hlds_ps_coverage_point(CoveragePointInfo, !SlotNum, !IO) :-
+    CoveragePointInfo = coverage_point_info(GoalPath, PointType),
+    io.format("%% coverage point slot %d: goal path <%s>, type %s\n",
+        [i(!.SlotNum), s(goal_path_to_string(GoalPath)),
+            s(coverage_point_to_string(PointType))], !IO),
+    !:SlotNum = !.SlotNum + 1.
+:- func coverage_point_to_string(cp_type) = string.
+coverage_point_to_string(cp_type_coverage_after) = "after".
+coverage_point_to_string(cp_type_branch_arm) = "branch arm".
 determinism_to_string(detism_det) = "det".
 determinism_to_string(detism_semi) = "semidet".
 determinism_to_string(detism_non) = "nondet".
Index: compiler/proc_label.m
RCS file: /home/mercury/mercury1/repository/mercury/compiler/proc_label.m,v
retrieving revision 1.24
diff -u -b -r1.24 proc_label.m
--- compiler/proc_label.m	13 Aug 2007 03:01:43 -0000	1.24
+++ compiler/proc_label.m	2 Nov 2008 01:16:44 -0000
@@ -28,8 +28,6 @@
 :- import_module parse_tree.
 :- import_module parse_tree.prog_data.
-:- import_module bool.
     % Return the id of the procedure specified by the rtti_proc_label.
 :- func make_proc_label_from_rtti(rtti_proc_label) = proc_label.
@@ -38,17 +36,6 @@
 :- func make_proc_label(module_info, pred_id, proc_id) = proc_label.
-    % make_user_proc_label(ModuleName, PredIsImported,
-    %   PredOrFunc, ModuleName, PredName, Arity, ProcId) = Label:
-    %
-    % Make a proc_label for a user-defined procedure.
-    %
-    % The PredIsImported argument should be the result of
-    % calling pred_info_is_imported.
-    %
-:- func make_user_proc_label(module_name, bool, pred_or_func, module_name,
-    string, arity, proc_id) = proc_label.
     % Return the id of the specified mode of the unification procedure
     % for the given type.
@@ -64,6 +51,7 @@
 :- import_module libs.compiler_util.
 :- import_module parse_tree.prog_type.
+:- import_module bool.
 :- import_module list.
 :- import_module pair.
 :- import_module string.
@@ -114,6 +102,17 @@
     RttiProcLabel = make_rtti_proc_label(ModuleInfo, PredId, ProcId),
     make_proc_label_from_rtti(RttiProcLabel) = ProcLabel.
+    % make_user_proc_label(ModuleName, PredIsImported,
+    %   PredOrFunc, ModuleName, PredName, Arity, ProcId) = Label:
+    %
+    % Make a proc_label for a user-defined procedure.
+    %
+    % The PredIsImported argument should be the result of
+    % calling pred_info_is_imported.
+    %
+:- func make_user_proc_label(module_name, bool, pred_or_func,
+    module_name, string, arity, proc_id) = proc_label.
 make_user_proc_label(ThisModule, PredIsImported, PredOrFunc, PredModule,
         PredName, PredArity, ProcId) = ProcLabel :-
Index: compiler/type_ctor_info.m
RCS file: /home/mercury/mercury1/repository/mercury/compiler/type_ctor_info.m,v
retrieving revision 1.96
diff -u -b -r1.96 type_ctor_info.m
--- compiler/type_ctor_info.m	11 Feb 2008 21:26:11 -0000	1.96
+++ compiler/type_ctor_info.m	2 Nov 2008 00:31:52 -0000
@@ -290,8 +290,12 @@
 construct_type_ctor_info(TypeCtorGenInfo, ModuleInfo, RttiData) :-
     TypeCtorGenInfo = type_ctor_gen_info(_TypeCtor, ModuleName, TypeName,
         TypeArity, _Status, HldsDefn, UnifyPredProcId, ComparePredProcId),
-    make_rtti_proc_label(UnifyPredProcId, ModuleInfo, UnifyProcLabel),
-    make_rtti_proc_label(ComparePredProcId, ModuleInfo, CompareProcLabel),
+    UnifyPredProcId = proc(UnifyPredId, UnifyProcId),
+    UnifyProcLabel = make_rtti_proc_label(ModuleInfo,
+        UnifyPredId, UnifyProcId),
+    ComparePredProcId = proc(ComparePredId, CompareProcId),
+    CompareProcLabel = make_rtti_proc_label(ModuleInfo,
+        ComparePredId, CompareProcId),
     type_to_univ(UnifyProcLabel, UnifyUniv),
     type_to_univ(CompareProcLabel, CompareUniv),
     hlds_data.get_type_defn_body(HldsDefn, TypeBody),
@@ -457,13 +461,6 @@
 impl_type_ctor("private_builtin", "ticket", 0, impl_ctor_ticket).
 impl_type_ctor("table_builtin", "ml_subgoal", 0, impl_ctor_subgoal).
-:- pred make_rtti_proc_label(pred_proc_id::in, module_info::in,
-    rtti_proc_label::out) is det.
-make_rtti_proc_label(PredProcId, ModuleInfo, ProcLabel) :-
-    PredProcId = proc(PredId, ProcId),
-    ProcLabel = make_rtti_proc_label(ModuleInfo, PredId, ProcId).
     % The version of the RTTI data structures -- useful for bootstrapping.
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