fortran: enable ptype/whatis for modules.

Added new domain MODULE_DOMAIN for fortran modules to avoid
issues with sharing namespaces (e.g. when a variable currently
in scope has the same name as a module).

	(gdb) ptype modname
	old> No symbol "modname" in current context.
	new> type = module modname

This fixes PR 15209 and also addresses the issue
with sharing namespaces:
https://sourceware.org/ml/gdb-patches/2013-02/msg00643.html

2013-11-19  Keven Boell  <keven.boell@intel.com>
            Sanimir Agovic  <sanimir.agovic@intel.com>

	* cp-namespace.c (cp_lookup_nested_symbol): Enable
	nested lookups for fortran modules.
	* dwarf2read.c (read_module): Add fortran module to
	the symbol table.
	(add_partial_symbol, add_partial_module): Add fortran
	module to the partial symbol table.
	(new_symbol_full): Create full symbol for fortran module.
	* f-exp.y (yylex): Add new module domain to be parsed.
	* symtab.h: New domain for fortran modules.

testsuite/

	* gdb.fortran/module.exp: Completion matches fortran module
	names as well. ptype/whatis on modules return a proper type.
	Add new check for having the correct scope.

ChangeLog

@@ -1,3 +1,15 @@
+2013-12-19  Keven Boell  <keven.boell@intel.com>
+
+	* cp-namespace.c (cp_lookup_nested_symbol): Enable
+	nested lookups for fortran modules.
+	* dwarf2read.c (read_module): Add fortran module to
+	the symbol table.
+	(add_partial_symbol, add_partial_module): Add fortran
+	module to the partial symbol table.
+	(new_symbol_full): Create full symbol for fortran module.
+	* f-exp.y (yylex): Add new module domain to be parsed.
+	* symtab.h: New domain for fortran modules.
+
 2013-12-19  Keven Boell  <keven.boell@intel.com>
 
 	* f-exp.y (yylex): Add domain array to enable lookup

gdb/cp-namespace.c

@@ -812,6 +812,10 @@ cp_lookup_nested_symbol (struct type *parent_type,
     case TYPE_CODE_STRUCT:
     case TYPE_CODE_NAMESPACE:
     case TYPE_CODE_UNION:
+    /* NOTE: Handle modules here as well, because Fortran is re-using the C++
+       specific code to lookup nested symbols in modules, by calling the
+       function pointer la_lookup_symbol_nonlocal, which ends up here.  */
+    case TYPE_CODE_MODULE:
       {
 	/* NOTE: carlton/2003-11-10: We don't treat C++ class members
 	   of classes like, say, data or function members.  Instead,

gdb/dwarf2read.c

@@ -6801,6 +6801,13 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
 			   &objfile->global_psymbols,
 			   0, (CORE_ADDR) 0, cu->language, objfile);
       break;
+    case DW_TAG_module:
+      add_psymbol_to_list (actual_name, strlen (actual_name),
+			   built_actual_name != NULL,
+			   MODULE_DOMAIN, LOC_TYPEDEF,
+			   &objfile->global_psymbols,
+			   0, (CORE_ADDR) 0, cu->language, objfile);
+      break;
     case DW_TAG_class_type:
     case DW_TAG_interface_type:
     case DW_TAG_structure_type:
@@ -6871,6 +6878,10 @@ static void
 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
 		    CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
 {
+  /* Add a symbol for the namespace.  */
+
+  add_partial_symbol (pdi, cu);
+
   /* Now scan partial symbols in that module.  */
 
   if (pdi->has_children)
@@ -13674,6 +13685,10 @@ static void
 read_module (struct die_info *die, struct dwarf2_cu *cu)
 {
   struct die_info *child_die = die->child;
+  struct type *type;
+
+  type = read_type_die (die, cu);
+  new_symbol (die, type, cu);
 
   while (child_die && child_die->tag)
     {
@@ -17704,6 +17719,11 @@ new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
 	  SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
 	  list_to_add = &global_symbols;
 	  break;
+	case DW_TAG_module:
+	  SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
+	  SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
+	  list_to_add = &global_symbols;
+	  break;
 	case DW_TAG_common_block:
 	  SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
 	  SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;

gdb/f-exp.y

@@ -1175,7 +1175,12 @@ yylex (void)
     char *tmp = copy_name (yylval.sval);
     struct symbol *sym;
     struct field_of_this_result is_a_field_of_this;
-    enum domain_enum_tag lookup_domains[] = {STRUCT_DOMAIN, VAR_DOMAIN};
+    enum domain_enum_tag lookup_domains[] =
+    {
+      STRUCT_DOMAIN,
+      VAR_DOMAIN,
+      MODULE_DOMAIN
+    };
     int i;
     int hextype;
 

gdb/symtab.h

@@ -418,6 +418,10 @@ typedef enum domain_enum_tag
 
   STRUCT_DOMAIN,
 
+  /* MODULE_DOMAIN is used in Fortran to hold module type names.  */
+
+  MODULE_DOMAIN,
+
   /* LABEL_DOMAIN may be used for names of labels (for gotos).  */
 
   LABEL_DOMAIN,

gdb/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2013-12-19  Keven Boell  <keven.boell@intel.com>
+
+	* gdb.fortran/module.exp: Completion matches fortran module
+	names as well. ptype/whatis on modules return a proper type.
+	Add new check for having the correct scope.
+
 2013-12-19  Keven Boell  <keven.boell@intel.com>
 
 	* gdb.fortran/type.f90: New file.

gdb/testsuite/gdb.fortran/module.exp

@@ -43,6 +43,13 @@ gdb_breakpoint [gdb_get_line_number "i-is-2"]
 gdb_continue_to_breakpoint "i-is-2" ".*i-is-2.*"
 gdb_test "print var_i" " = 2" "print var_i value 2"
 
+gdb_breakpoint [gdb_get_line_number "i-is-3"]
+gdb_continue_to_breakpoint "i-is-3" ".*i-is-3.*"
+# Ensure that the scope is correctly resolved.
+gdb_test "p mod3" "Attempt to use a type name as an expression" "print mod3"
+gdb_test "p mod2" " = 3" "print mod2"
+gdb_test "p mod1" " = 3" "print mod1"
+
 gdb_breakpoint [gdb_get_line_number "a-b-c-d"]
 gdb_continue_to_breakpoint "a-b-c-d" ".*a-b-c-d.*"
 gdb_test "print var_a" "No symbol \"var_a\" in current context\\."
@@ -54,7 +61,7 @@ gdb_test "print var_x" " = 30" "print var_x value 30"
 gdb_test "print var_y" "No symbol \"var_y\" in current context\\."
 gdb_test "print var_z" " = 31" "print var_x value 31"
 
-gdb_test "ptype modmany" {No symbol "modmany" in current context.}
+gdb_test "ptype modmany" "type = module modmany"
 
 proc complete {expr list} {
     set cmd "complete p $expr"
@@ -62,8 +69,8 @@ proc complete {expr list} {
     gdb_test $cmd $expect "complete $expr"
 }
 set modmany_list {modmany::var_a modmany::var_b modmany::var_c modmany::var_i}
-complete "modm" $modmany_list
-complete "modmany" $modmany_list
+complete "modm" "modmany $modmany_list"
+complete "modmany" "modmany $modmany_list"
 complete "modmany::" $modmany_list
 complete "modmany::var" $modmany_list
 

gdb/testsuite/gdb.fortran/module.f90

@@ -23,6 +23,12 @@ module mod2
         integer :: var_i = 2
 end module mod2
 
+module mod3
+        integer :: mod2 = 3
+        integer :: mod1 = 3
+        integer :: var_i = 3
+end module mod3
+
 module modmany
         integer :: var_a = 10, var_b = 11, var_c = 12, var_i = 14
 end module modmany
@@ -43,6 +49,11 @@ end module moduse
         var_i = var_i                         ! i-is-2
         end
 
+        subroutine sub3
+        USE mod3
+        var_i = var_i                         ! i-is-3
+        END
+
         program module
 
         use modmany, only: var_b, var_d => var_c, var_i
@@ -50,6 +61,7 @@ end module moduse
 
         call sub1
         call sub2
+        call sub3
 
         if (var_b .ne. 11) call abort
         if (var_d .ne. 12) call abort