[PATCH 1/2] gdb: add default parameter for cp_demangled_name_to_comp errmsg

Most call sites pass NULL as cp_demangled_name_to_comp's errmsg
parameter (they are not interested in the error message).  Make errmsg
have a nullptr default value and simplify those call sites.

I am generally not a big fan of default values, especially when the
parameter changes how the function behaves.  But in this case it does
really change the behavior of the function, so I think it's fine.

There is one spot (should_parse) that passed a non-NULL value but then
did not use it, remove that.

Change-Id: I9d30229047d9892cc44953914e6416a607949152
---
 gdb/cp-name-parser.y |  3 +--
 gdb/cp-support.c     | 12 ++++++------
 gdb/cp-support.h     |  2 +-
 3 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/gdb/cp-name-parser.y b/gdb/cp-name-parser.y
index 4be50599762e..aee5d8341519 100644
--- a/gdb/cp-name-parser.y
+++ b/gdb/cp-name-parser.y
@@ -2098,8 +2098,7 @@ should_be_the_same (const char *one, const char *two)
 static void
 should_parse (const char *name)
 {
-  std::string err;
-  auto parsed = cp_demangled_name_to_comp (name, &err);
+  auto parsed = cp_demangled_name_to_comp (name);
   SELF_CHECK (parsed != nullptr);
 }
 
diff --git a/gdb/cp-support.c b/gdb/cp-support.c
index 335e06a039f2..36d7c8dd113e 100644
--- a/gdb/cp-support.c
+++ b/gdb/cp-support.c
@@ -253,7 +253,7 @@ inspect_type (struct demangle_parse_info *info,
 	     tree will contain pointers into NAME, so NAME cannot
 	     be free'd until all typedef conversion is done and
 	     the final result is converted into a string.  */
-	  i = cp_demangled_name_to_comp (name, NULL);
+	  i = cp_demangled_name_to_comp (name);
 	  if (i != NULL)
 	    {
 	      /* Merge the two trees.  */
@@ -600,7 +600,7 @@ cp_canonicalize_string_full (const char *string,
   std::unique_ptr<demangle_parse_info> info;
 
   estimated_len = strlen (string) * 2;
-  info = cp_demangled_name_to_comp (string, NULL);
+  info = cp_demangled_name_to_comp (string);
   if (info != NULL)
     {
       /* Replace all the typedefs in the tree.  */
@@ -647,7 +647,7 @@ cp_canonicalize_string (const char *string)
   if (cp_already_canonical (string))
     return nullptr;
 
-  info = cp_demangled_name_to_comp (string, NULL);
+  info = cp_demangled_name_to_comp (string);
   if (info == NULL)
     return nullptr;
 
@@ -709,7 +709,7 @@ mangled_name_to_comp (const char *mangled_name, int options,
   /* If we could demangle the name, parse it to build the component
      tree.  */
   std::unique_ptr<demangle_parse_info> info
-    = cp_demangled_name_to_comp (demangled_name.get (), NULL);
+    = cp_demangled_name_to_comp (demangled_name.get ());
 
   if (info == NULL)
     return NULL;
@@ -904,7 +904,7 @@ cp_func_name (const char *full_name)
   struct demangle_component *ret_comp;
   std::unique_ptr<demangle_parse_info> info;
 
-  info = cp_demangled_name_to_comp (full_name, NULL);
+  info = cp_demangled_name_to_comp (full_name);
   if (!info)
     return nullptr;
 
@@ -933,7 +933,7 @@ cp_remove_params_1 (const char *demangled_name, bool require_params)
   if (demangled_name == NULL)
     return NULL;
 
-  info = cp_demangled_name_to_comp (demangled_name, NULL);
+  info = cp_demangled_name_to_comp (demangled_name);
   if (info == NULL)
     return NULL;
 
diff --git a/gdb/cp-support.h b/gdb/cp-support.h
index 2bd3430a7a81..e495895afdbc 100644
--- a/gdb/cp-support.h
+++ b/gdb/cp-support.h
@@ -169,7 +169,7 @@ struct type *cp_find_type_baseclass_by_name (struct type *parent_type,
 /* Functions from cp-name-parser.y.  */
 
 extern std::unique_ptr<demangle_parse_info> cp_demangled_name_to_comp
-     (const char *demangled_name, std::string *errmsg);
+     (const char *demangled_name, std::string *errmsg = nullptr);
 
 /* Convert RESULT to a string.  ESTIMATED_LEN is used only as a guide
    to the length of the result.  */

base-commit: d2102b0d6a95ba3b37204976fb3f6ebd935822fb
-- 
2.55.0