[m-rev.] diff: variable numbers in RTTI

[Zoltan Somogyi]

compiler/prog_rep.m:
compiler/stack_layout.m:
	When creating a representation of a procedure body, take into account
	the variable number mapping we use when creating references to
	variables in the main part of the RTTI, so that the various parts of
	the RTTI (the part used by the procedural debugger and the part used by
	the declarative debugger) are in sync.

Zoltan.

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Index: compiler/prog_rep.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/prog_rep.m,v
retrieving revision 1.27
diff -u -b -r1.27 prog_rep.m
--- compiler/prog_rep.m	19 Nov 2004 11:54:20 -0000	1.27
+++ compiler/prog_rep.m	24 Nov 2004 01:08:53 -0000
@@ -27,10 +27,22 @@
 :- import_module mdbcomp.
 :- import_module mdbcomp__program_representation.
 
-:- import_module list.
+:- import_module list, map, std_util.
 
-:- pred prog_rep__represent_proc(list(prog_var)::in, hlds_goal::in,
-	instmap::in, vartypes::in, module_info::in, proc_rep::out) is det.
+% A var_num_map maps each variable that occurs in any of a procedure's layout
+% structures to a number that uniquely identifies that variable, and to its
+% name.
+%
+% The integer returned by term__var_to_int are a dense set when we consider
+% all the original variables of a procedure. However, it can become less dense
+% when an optimization removes all references to a variable, and becomes less
+% dense still when we consider only variables that occur in a layout structure.
+% This is why we allocate our own id numbers.
+
+:- type var_num_map	== map(prog_var, pair(int, string)).
+
+:- func prog_rep__represent_proc(list(prog_var), hlds_goal,
+	instmap, vartypes, var_num_map, module_info) = proc_rep.
 
 :- implementation.
 
@@ -43,14 +55,15 @@
 :- type prog_rep__info
 	--->	info(
 			vartypes    :: vartypes,
+			var_num_map	:: var_num_map,
 			module_info :: module_info
 		).
 
-prog_rep__represent_proc(HeadVars, Goal, InstMap0, VarTypes, ModuleInfo,
-		proc_rep(HeadVarsRep, GoalRep)) :-
+prog_rep__represent_proc(HeadVars, Goal, InstMap0, VarTypes, VarNumMap,
+		ModuleInfo) = proc_rep(HeadVarsRep, GoalRep) :-
 	list__map(term__var_to_int, HeadVars, HeadVarsRep),
-	prog_rep__represent_goal(Goal, InstMap0, info(VarTypes, ModuleInfo),
-		GoalRep).
+	prog_rep__represent_goal(Goal, InstMap0,
+		info(VarTypes, VarNumMap, ModuleInfo), GoalRep).
 
 :- pred prog_rep__represent_goal(hlds_goal::in, instmap::in,
 	prog_rep__info::in, goal_rep::out) is det.
Index: compiler/stack_layout.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/stack_layout.m,v
retrieving revision 1.96
diff -u -b -r1.96 stack_layout.m
--- compiler/stack_layout.m	19 Nov 2004 05:46:09 -0000	1.96
+++ compiler/stack_layout.m	19 Nov 2004 05:47:11 -0000
@@ -568,8 +568,8 @@
 		MaybeProcRepRval = no
 	;
 		MaybeGoal = yes(Goal),
-		prog_rep__represent_proc(HeadVars, Goal, InstMap, VarTypes,
-			ModuleInfo, ProcRep),
+		ProcRep = prog_rep__represent_proc(HeadVars, Goal, InstMap,
+			VarTypes, VarNumMap, ModuleInfo),
 		type_to_univ(ProcRep, ProcRepUniv),
 		StaticCellInfo0 = !.Info ^ static_cell_info,
 		static_term__term_to_rval(ProcRepUniv, ProcRepRval,
@@ -680,18 +680,6 @@
 		!MaxNum, OffsetsTail, !Info).
 
 %---------------------------------------------------------------------------%
-
-% A var_num_map maps each variable that occurs in any of a procedure's layout
-% structures to a number that uniquely identifies that variable, and to its
-% name.
-%
-% The integer returned by term__var_to_int are a dense set when we consider
-% all the original variables of a procedure. However, it can become less dense
-% when an optimization removes all references to a variable, and becomes less
-% dense still when we consider only variables that occur in a layout structure.
-% This is why we allocate our own id numbers.
-
-:- type var_num_map	== map(prog_var, pair(int, string)).
 
 :- pred compute_var_number_map(list(prog_var)::in, prog_varset::in,
 	assoc_list(int, internal_layout_info)::in, maybe(hlds_goal)::in,
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