gdb: Convert language la_is_string_type_p field to a method

This commit changes the language_data::la_is_string_type_p function
pointer member variable into a member function of language_defn.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* ada-lang.c (ada_language_data): Delete la_is_string_type_p
	initializer.
	(ada_language::is_string_type_p): New member function.
	* c-lang.c (c_language_data): Delete la_is_string_type_p
	initializer.
	(cplus_language_data): Likewise.
	(asm_language_data): Likewise.
	(minimal_language_data): Likewise.
	* d-lang.c (d_language_data): Likewise.
	* f-lang.c (f_is_string_type_p): Delete function, implementation
	moved to f_language::is_string_type_p.
	(f_language_data): Delete la_is_string_type_p initializer.
	(f_language::is_string_type_p): New member function,
	implementation from f_is_string_type_p.
	* go-lang.c (go_is_string_type_p): Delete function, implementation
	moved to go_language::is_string_type_p.
	(go_language_data): Delete la_is_string_type_p initializer.
	(go_language::is_string_type_p): New member function,
	implementation from go_is_string_type_p.
	* language.c (language_defn::is_string_type_p): Define new member
	function.
	(default_is_string_type_p): Make static, add comment copied from
	header file.
	(unknown_language_data): Delete la_is_string_type_p initializer.
	(unknown_language::is_string_type_p): New member function.
	(auto_language_data): Delete la_is_string_type_p initializer.
	(auto_language::is_string_type_p): New member function.
	* language.h (language_data): Delete la_is_string_type_p field.
	(language_defn::is_string_type_p): Declare new function.
	(default_is_string_type_p): Delete desclaration, move comment to
	definition.
	* m2-lang.c (m2_is_string_type_p): Delete function, implementation
	moved to m2_language::is_string_type_p.
	(m2_language_data): Delete la_is_string_type_p initializer.
	(m2_language::is_string_type_p): New member function,
	implementation from m2_is_string_type_p.
	* objc-lang.c (objc_language_data): Delete la_is_string_type_p
	initializer.
	* opencl-lang.c (opencl_language_data): Likewise.
	* p-lang.c (pascal_is_string_type_p): Delete function,
	implementation moved to pascal_language::is_string_type_p.
	(pascal_language_data): Delete la_is_string_type_p initializer.
	(pascal_language::is_string_type_p): New member function,
	implementation from pascal_is_string_type_p.
	* rust-lang.c (rust_is_string_type_p): Delete function,
	implementation moved to rust_language::is_string_type_p.
	(rust_language_data): Delete la_is_string_type_p initializer.
	(rust_language::is_string_type_p): New member function,
	implementation from rust_is_string_type_p.
	* valprint.c (val_print_scalar_or_string_type_p): Update call to
	is_string_type_p.

14 files changed, 156 insertions, 97 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index de348bb..af34af8 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,59 @@
 2020-06-23  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* ada-lang.c (ada_language_data): Delete la_is_string_type_p
+	initializer.
+	(ada_language::is_string_type_p): New member function.
+	* c-lang.c (c_language_data): Delete la_is_string_type_p
+	initializer.
+	(cplus_language_data): Likewise.
+	(asm_language_data): Likewise.
+	(minimal_language_data): Likewise.
+	* d-lang.c (d_language_data): Likewise.
+	* f-lang.c (f_is_string_type_p): Delete function, implementation
+	moved to f_language::is_string_type_p.
+	(f_language_data): Delete la_is_string_type_p initializer.
+	(f_language::is_string_type_p): New member function,
+	implementation from f_is_string_type_p.
+	* go-lang.c (go_is_string_type_p): Delete function, implementation
+	moved to go_language::is_string_type_p.
+	(go_language_data): Delete la_is_string_type_p initializer.
+	(go_language::is_string_type_p): New member function,
+	implementation from go_is_string_type_p.
+	* language.c (language_defn::is_string_type_p): Define new member
+	function.
+	(default_is_string_type_p): Make static, add comment copied from
+	header file.
+	(unknown_language_data): Delete la_is_string_type_p initializer.
+	(unknown_language::is_string_type_p): New member function.
+	(auto_language_data): Delete la_is_string_type_p initializer.
+	(auto_language::is_string_type_p): New member function.
+	* language.h (language_data): Delete la_is_string_type_p field.
+	(language_defn::is_string_type_p): Declare new function.
+	(default_is_string_type_p): Delete desclaration, move comment to
+	definition.
+	* m2-lang.c (m2_is_string_type_p): Delete function, implementation
+	moved to m2_language::is_string_type_p.
+	(m2_language_data): Delete la_is_string_type_p initializer.
+	(m2_language::is_string_type_p): New member function,
+	implementation from m2_is_string_type_p.
+	* objc-lang.c (objc_language_data): Delete la_is_string_type_p
+	initializer.
+	* opencl-lang.c (opencl_language_data): Likewise.
+	* p-lang.c (pascal_is_string_type_p): Delete function,
+	implementation moved to pascal_language::is_string_type_p.
+	(pascal_language_data): Delete la_is_string_type_p initializer.
+	(pascal_language::is_string_type_p): New member function,
+	implementation from pascal_is_string_type_p.
+	* rust-lang.c (rust_is_string_type_p): Delete function,
+	implementation moved to rust_language::is_string_type_p.
+	(rust_language_data): Delete la_is_string_type_p initializer.
+	(rust_language::is_string_type_p): New member function,
+	implementation from rust_is_string_type_p.
+	* valprint.c (val_print_scalar_or_string_type_p): Update call to
+	is_string_type_p.
+
+2020-06-23  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* ada-lang.c (ada_language_data): Delete la_print_typedef
 	initializer.
 	(ada_language::print_typedef): New member function.
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 752bf44..9b0c2ef 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -13687,7 +13687,6 @@ extern const struct language_data ada_language_data =
   0,                            /* c-style arrays */
   1,                            /* String lower bound */
   &ada_varobj_ops,
-  ada_is_string_type,
   "(...)"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -14139,6 +14138,14 @@ public:
     ada_print_typedef (type, new_symbol, stream);
   }
 
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    return ada_is_string_type (type);
+  }
+
+
 protected:
   /* See language.h.  */
 
diff --git a/gdb/c-lang.c b/gdb/c-lang.c
index aca0d7a..f29f2ce 100644
--- a/gdb/c-lang.c
+++ b/gdb/c-lang.c
@@ -895,7 +895,6 @@ extern const struct language_data c_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &c_varobj_ops,
-  c_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -997,7 +996,6 @@ extern const struct language_data cplus_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &cplus_varobj_ops,
-  c_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -1196,7 +1194,6 @@ extern const struct language_data asm_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  c_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -1253,7 +1250,6 @@ extern const struct language_data minimal_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  c_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
diff --git a/gdb/d-lang.c b/gdb/d-lang.c
index b907dd7..4ebb011 100644
--- a/gdb/d-lang.c
+++ b/gdb/d-lang.c
@@ -148,7 +148,6 @@ extern const struct language_data d_language_data =
   1,				/* C-style arrays.  */
   0,				/* String lower bound.  */
   &default_varobj_ops,
-  c_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index 946d5bc..58b41d1 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -291,17 +291,6 @@ evaluate_subexp_f (struct type *expect_type, struct expression *exp,
   return nullptr;
 }
 
-/* Return true if TYPE is a string.  */
-
-static bool
-f_is_string_type_p (struct type *type)
-{
-  type = check_typedef (type);
-  return (type->code () == TYPE_CODE_STRING
-	  || (type->code () == TYPE_CODE_ARRAY
-	      && TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_CHAR));
-}
-
 /* Special expression lengths for Fortran.  */
 
 static void
@@ -519,7 +508,6 @@ extern const struct language_data f_language_data =
   0,				/* arrays are first-class (not c-style) */
   1,				/* String lower bound */
   &default_varobj_ops,
-  f_is_string_type_p,
   "(...)"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -709,6 +697,16 @@ public:
     f_print_typedef (type, new_symbol, stream);
   }
 
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    type = check_typedef (type);
+    return (type->code () == TYPE_CODE_STRING
+	    || (type->code () == TYPE_CODE_ARRAY
+		&& TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_CHAR));
+  }
+
 protected:
 
   /* See language.h.  */
diff --git a/gdb/go-lang.c b/gdb/go-lang.c
index fa26399..cb42ef1 100644
--- a/gdb/go-lang.c
+++ b/gdb/go-lang.c
@@ -131,16 +131,6 @@ go_classify_struct_type (struct type *type)
   return GO_TYPE_NONE;
 }
 
-/* Return true if TYPE is a string.  */
-
-static bool
-go_is_string_type_p (struct type *type)
-{
-  type = check_typedef (type);
-  return (type->code () == TYPE_CODE_STRUCT
-	  && go_classify_struct_type (type) == GO_TYPE_STRING);
-}
-
 /* Subroutine of unpack_mangled_go_symbol to simplify it.
    Given "[foo.]bar.baz", store "bar" in *PACKAGEP and "baz" in *OBJECTP.
    We stomp on the last '.' to nul-terminate "bar".
@@ -533,7 +523,6 @@ extern const struct language_data go_language_data =
   1,				/* C-style arrays.  */
   0,				/* String lower bound.  */
   &default_varobj_ops,
-  go_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -638,6 +627,16 @@ public:
   {
     return go_parse (ps);
   }
+
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    type = check_typedef (type);
+    return (type->code () == TYPE_CODE_STRUCT
+	    && go_classify_struct_type (type) == GO_TYPE_STRING);
+  }
+
 };
 
 /* Single instance of the Go language class.  */
diff --git a/gdb/language.c b/gdb/language.c
index 5ae8c46..c993cfc 100644
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -690,6 +690,14 @@ language_defn::print_typedef (struct type *type, struct symbol *new_symbol,
   c_print_typedef (type, new_symbol, stream);
 }
 
+/* See language.h.  */
+
+bool
+language_defn::is_string_type_p (struct type *type) const
+{
+  return c_is_string_type_p (type);
+}
+
 /* The default implementation of the get_symbol_name_matcher_inner method
    from the language_defn class.  Matches with strncmp_iw.  */
 
@@ -741,9 +749,10 @@ language_defn::get_symbol_name_matcher_inner
   return default_symbol_name_matcher;
 }
 
-/* See language.h.  */
+/* Return true if TYPE is a string type, otherwise return false.  This
+   default implementation only detects TYPE_CODE_STRING.  */
 
-bool
+static bool
 default_is_string_type_p (struct type *type)
 {
   type = check_typedef (type);
@@ -789,7 +798,6 @@ extern const struct language_data unknown_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  default_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -884,6 +892,13 @@ public:
   {
     error (_("unimplemented unknown_language::print_typedef called"));
   }
+
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    return default_is_string_type_p (type);
+  }
 };
 
 /* Single instance of the unknown language class.  */
@@ -909,7 +924,6 @@ extern const struct language_data auto_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  default_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -1004,6 +1018,13 @@ public:
   {
     error (_("unimplemented auto_language::print_typedef called"));
   }
+
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    return default_is_string_type_p (type);
+  }
 };
 
 /* Single instance of the fake "auto" language.  */
diff --git a/gdb/language.h b/gdb/language.h
index 19cd820..d2e5b73 100644
--- a/gdb/language.h
+++ b/gdb/language.h
@@ -267,9 +267,6 @@ struct language_data
     /* Various operations on varobj.  */
     const struct lang_varobj_ops *la_varobj_ops;
 
-    /* Return true if TYPE is a string type.  */
-    bool (*la_is_string_type_p) (struct type *type);
-
     /* This string is used by the 'set print max-depth' setting.  When GDB
        replaces a struct or union (during value printing) that is "too
        deep" this string is displayed instead.  */
@@ -553,6 +550,9 @@ struct language_defn : language_data
   virtual void print_typedef (struct type *type, struct symbol *new_symbol,
 			      struct ui_file *stream) const;
 
+  /* Return true if TYPE is a string type.  */
+  virtual bool is_string_type_p (struct type *type) const;
+
 protected:
 
   /* This is the overridable part of the GET_SYMBOL_NAME_MATCHER method.
@@ -684,10 +684,6 @@ extern enum language set_language (enum language);
 
 extern int pointer_type (struct type *);
 
-/* Return true if TYPE is a string type, otherwise return false.  This
-   default implementation only detects TYPE_CODE_STRING.  */
-extern bool default_is_string_type_p (struct type *type);
-
 /* Error messages */
 
 extern void range_error (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
diff --git a/gdb/m2-lang.c b/gdb/m2-lang.c
index f0f7c22..2c39359 100644
--- a/gdb/m2-lang.c
+++ b/gdb/m2-lang.c
@@ -42,27 +42,6 @@ m2_printchar (int c, struct type *type, struct ui_file *stream)
   fputs_filtered ("'", stream);
 }
 
-/* Return true if TYPE is a string.  */
-
-static bool
-m2_is_string_type_p (struct type *type)
-{
-  type = check_typedef (type);
-  if (type->code () == TYPE_CODE_ARRAY
-      && TYPE_LENGTH (type) > 0
-      && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
-    {
-      struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
-
-      if (TYPE_LENGTH (elttype) == 1
-	  && (elttype->code () == TYPE_CODE_INT
-	      || elttype->code () == TYPE_CODE_CHAR))
-	return true;
-    }
-
-  return false;
-}
-
 static struct value *
 evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
 			 int *pos, enum noside noside)
@@ -235,7 +214,6 @@ extern const struct language_data m2_language_data =
   0,				/* arrays are first-class (not c-style) */
   0,				/* String lower bound */
   &default_varobj_ops,
-  m2_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -435,6 +413,25 @@ public:
     m2_print_typedef (type, new_symbol, stream);
   }
 
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    type = check_typedef (type);
+    if (type->code () == TYPE_CODE_ARRAY
+	&& TYPE_LENGTH (type) > 0
+	&& TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
+      {
+	struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
+
+	if (TYPE_LENGTH (elttype) == 1
+	    && (elttype->code () == TYPE_CODE_INT
+		|| elttype->code () == TYPE_CODE_CHAR))
+	  return true;
+      }
+
+    return false;
+  }
 };
 
 /* Single instance of the M2 language.  */
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index 0c95273..63cdac1 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -343,7 +343,6 @@ extern const struct language_data objc_language_data =
   1,				/* C-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  c_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
diff --git a/gdb/opencl-lang.c b/gdb/opencl-lang.c
index 2431fae..eccf1df 100644
--- a/gdb/opencl-lang.c
+++ b/gdb/opencl-lang.c
@@ -1022,7 +1022,6 @@ extern const struct language_data opencl_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  c_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
diff --git a/gdb/p-lang.c b/gdb/p-lang.c
index 9fd8231..07afbdd 100644
--- a/gdb/p-lang.c
+++ b/gdb/p-lang.c
@@ -152,16 +152,6 @@ is_pascal_string_type (struct type *type,int *length_pos,
   return 0;
 }
 
-/* This is a wrapper around IS_PASCAL_STRING_TYPE that returns true if TYPE
-   is a string.  */
-
-static bool
-pascal_is_string_type_p (struct type *type)
-{
-  return is_pascal_string_type (type, nullptr, nullptr, nullptr,
-				nullptr, nullptr) > 0;
-}
-
 static void pascal_one_char (int, struct ui_file *, int *);
 
 /* Print the character C on STREAM as part of the contents of a literal
@@ -282,7 +272,6 @@ extern const struct language_data pascal_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  pascal_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -502,6 +491,13 @@ public:
     pascal_print_typedef (type, new_symbol, stream);
   }
 
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    return is_pascal_string_type (type, nullptr, nullptr, nullptr,
+				  nullptr, nullptr) > 0;
+  }
 };
 
 /* Single instance of the Pascal language class.  */
diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 083b3f7..d1efea1 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -226,26 +226,6 @@ rust_chartype_p (struct type *type)
 	  && TYPE_UNSIGNED (type));
 }
 
-/* Return true if TYPE is a string type.  */
-
-static bool
-rust_is_string_type_p (struct type *type)
-{
-  LONGEST low_bound, high_bound;
-
-  type = check_typedef (type);
-  return ((type->code () == TYPE_CODE_STRING)
-	  || (type->code () == TYPE_CODE_PTR
-	      && (TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_ARRAY
-		  && rust_u8_type_p (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (type)))
-		  && get_array_bounds (TYPE_TARGET_TYPE (type), &low_bound,
-				       &high_bound)))
-	  || (type->code () == TYPE_CODE_STRUCT
-	      && !rust_enum_p (type)
-	      && rust_slice_type_p (type)
-	      && strcmp (type->name (), "&str") == 0));
-}
-
 /* If VALUE represents a trait object pointer, return the underlying
    pointer with the correct (i.e., runtime) type.  Otherwise, return
    NULL.  */
@@ -1946,7 +1926,6 @@ extern const struct language_data rust_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  rust_is_string_type_p,
   "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
@@ -2152,6 +2131,25 @@ public:
     type_print (type, "", stream, 0);
     fprintf_filtered (stream, ";");
   }
+
+  /* See language.h.  */
+
+  bool is_string_type_p (struct type *type) const override
+  {
+    LONGEST low_bound, high_bound;
+
+    type = check_typedef (type);
+    return ((type->code () == TYPE_CODE_STRING)
+	    || (type->code () == TYPE_CODE_PTR
+		&& (TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_ARRAY
+		    && rust_u8_type_p (TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (type)))
+		    && get_array_bounds (TYPE_TARGET_TYPE (type), &low_bound,
+					 &high_bound)))
+	    || (type->code () == TYPE_CODE_STRUCT
+		&& !rust_enum_p (type)
+		&& rust_slice_type_p (type)
+		&& strcmp (type->name (), "&str") == 0));
+  }
 };
 
 /* Single instance of the Rust language class.  */
diff --git a/gdb/valprint.c b/gdb/valprint.c
index 51c77c3..db98ca2 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -298,7 +298,7 @@ val_print_scalar_or_string_type_p (struct type *type,
 				   const struct language_defn *language)
 {
   return (val_print_scalar_type_p (type)
-	  || language->la_is_string_type_p (type));
+	  || language->is_string_type_p (type));
 }
 
 /* See its definition in value.h.  */