gdb: Convert la_struct_too_deep_ellipsis to a method

Convert language_data::la_struct_too_deep_ellipsis member variable to
a method in language_defn.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* ada-lang.c (ada_language_data): Remove
	la_struct_too_deep_ellipsis initializer.
	(ada_language::struct_too_deep_ellipsis): New member function.
	* c-lang.c (c_language_data): Remove la_struct_too_deep_ellipsis
	initializer.
	(cplus_language_data): Likewise.
	(asm_language_data): Likewise.
	(minimal_language_data): Likewise.
	* cp-valprint.c (cp_print_value): Update call to
	struct_too_deep_ellipsis.
	* d-lang.c (d_language_data): Remove la_struct_too_deep_ellipsis
	initializer.
	* f-lang.c (f_language_data): Likewise.
	(f_language::struct_too_deep_ellipsis): New member function.
	* go-lang.c (go_language_data): Remove la_struct_too_deep_ellipsis
	initializer.
	* language.c (unknown_language_data): Likewise.
	(auto_language_data): Likewise.
	* language.h (language_data): Delete la_struct_too_deep_ellipsis
	member variable.
	(language_defn::struct_too_deep_ellipsis): New member function.
	* m2-lang.c (m2_language_data): Remove la_struct_too_deep_ellipsis
	initializer.Q
	* objc-lang.c (objc_language_data): Likewise.
	* opencl-lang.c (opencl_language_data): Likewise.
	* p-lang.c (pascal_language_data): Likewise.
	* rust-lang.c (rust_language_data): Likewise.
	* valprint.c (val_print_check_max_depth): Update call to
	struct_too_deep_ellipsis.

gdb/ChangeLog

@@ -1,3 +1,35 @@
+2020-09-16  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* ada-lang.c (ada_language_data): Remove
+	la_struct_too_deep_ellipsis initializer.
+	(ada_language::struct_too_deep_ellipsis): New member function.
+	* c-lang.c (c_language_data): Remove la_struct_too_deep_ellipsis
+	initializer.
+	(cplus_language_data): Likewise.
+	(asm_language_data): Likewise.
+	(minimal_language_data): Likewise.
+	* cp-valprint.c (cp_print_value): Update call to
+	struct_too_deep_ellipsis.
+	* d-lang.c (d_language_data): Remove la_struct_too_deep_ellipsis
+	initializer.
+	* f-lang.c (f_language_data): Likewise.
+	(f_language::struct_too_deep_ellipsis): New member function.
+	* go-lang.c (go_language_data): Remove la_struct_too_deep_ellipsis
+	initializer.
+	* language.c (unknown_language_data): Likewise.
+	(auto_language_data): Likewise.
+	* language.h (language_data): Delete la_struct_too_deep_ellipsis
+	member variable.
+	(language_defn::struct_too_deep_ellipsis): New member function.
+	* m2-lang.c (m2_language_data): Remove la_struct_too_deep_ellipsis
+	initializer.Q
+	* objc-lang.c (objc_language_data): Likewise.
+	* opencl-lang.c (opencl_language_data): Likewise.
+	* p-lang.c (pascal_language_data): Likewise.
+	* rust-lang.c (rust_language_data): Likewise.
+	* valprint.c (val_print_check_max_depth): Update call to
+	struct_too_deep_ellipsis.
+
 2020-09-16  Felix Willgerodt  <felix.willgerodt@intel.com>
 
 	* MAINTAINERS (Write After Approval): Add myself.

gdb/ada-lang.c

@@ -13729,7 +13729,6 @@ extern const struct language_data ada_language_data =
   0,                            /* c-style arrays */
   1,                            /* String lower bound */
   &ada_varobj_ops,
-  "(...)"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the Ada language.  */
@@ -14187,6 +14186,10 @@ public:
     return ada_is_string_type (type);
   }
 
+  /* See language.h.  */
+
+  const char *struct_too_deep_ellipsis () const override
+  { return "(...)"; }
 
 protected:
   /* See language.h.  */

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,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the C language.  */
@@ -996,7 +995,6 @@ extern const struct language_data cplus_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &cplus_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* A class for the C++ language.  */
@@ -1194,7 +1192,6 @@ extern const struct language_data asm_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* A class for the ASM language.  */
@@ -1250,7 +1247,6 @@ extern const struct language_data minimal_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* A class for the minimal language.  */

gdb/cp-valprint.c

@@ -499,8 +499,8 @@ cp_print_value (struct value *val, struct ui_file *stream,
 	      && recurse >= options->max_depth)
 	    {
 	      const struct language_defn *language = current_language;
-	      gdb_assert (language->la_struct_too_deep_ellipsis != NULL);
+	      gdb_assert (language->struct_too_deep_ellipsis () != NULL);
-	      fputs_filtered (language->la_struct_too_deep_ellipsis, stream);
+	      fputs_filtered (language->struct_too_deep_ellipsis (), stream);
 	    }
 	  else
 	    {

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,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the D language.  */

gdb/f-lang.c

@@ -508,7 +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,
-  "(...)"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the Fortran language.  */
@@ -707,6 +706,11 @@ public:
 		&& TYPE_TARGET_TYPE (type)->code () == TYPE_CODE_CHAR));
   }
 
+  /* See language.h.  */
+
+  const char *struct_too_deep_ellipsis () const override
+  { return "(...)"; }
+
 protected:
 
   /* See language.h.  */

gdb/go-lang.c

@@ -523,7 +523,6 @@ extern const struct language_data go_language_data =
   1,				/* C-style arrays.  */
   0,				/* String lower bound.  */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the Go language.  */

gdb/language.c

@@ -798,7 +798,6 @@ extern const struct language_data unknown_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the unknown language.  */
@@ -924,7 +923,6 @@ extern const struct language_data auto_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the fake "auto" language.  */

gdb/language.h

@@ -266,12 +266,6 @@ struct language_data
 
     /* Various operations on varobj.  */
     const struct lang_varobj_ops *la_varobj_ops;
-
-    /* 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.  */
-    const char *la_struct_too_deep_ellipsis;
-
   };
 
 /* Base class from which all other language classes derive.  */
@@ -553,6 +547,16 @@ struct language_defn : language_data
   /* Return true if TYPE is a string type.  */
   virtual bool is_string_type_p (struct type *type) const;
 
+  /* Return a string that 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.  The default value here
+     suits most languages.  If overriding then the string here should
+     ideally be similar in style to the default; an opener, three '.', and
+     a closer.  */
+
+  virtual const char *struct_too_deep_ellipsis () const
+  { return "{...}"; }
+
 protected:
 
   /* This is the overridable part of the GET_SYMBOL_NAME_MATCHER method.

gdb/m2-lang.c

@@ -214,7 +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,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the M2 language.  */

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,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the Objective-C language.  */

gdb/opencl-lang.c

@@ -1021,7 +1021,6 @@ extern const struct language_data opencl_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the OpenCL language.  */

gdb/p-lang.c

@@ -272,7 +272,6 @@ extern const struct language_data pascal_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the Pascal language.  */

gdb/rust-lang.c

@@ -1921,7 +1921,6 @@ extern const struct language_data rust_language_data =
   1,				/* c-style arrays */
   0,				/* String lower bound */
   &default_varobj_ops,
-  "{...}"			/* la_struct_too_deep_ellipsis */
 };
 
 /* Class representing the Rust language.  */

gdb/valprint.c

@@ -1025,8 +1025,8 @@ val_print_check_max_depth (struct ui_file *stream, int recurse,
 {
   if (options->max_depth > -1 && recurse >= options->max_depth)
     {
-      gdb_assert (language->la_struct_too_deep_ellipsis != NULL);
+      gdb_assert (language->struct_too_deep_ellipsis () != NULL);
-      fputs_filtered (language->la_struct_too_deep_ellipsis, stream);
+      fputs_filtered (language->struct_too_deep_ellipsis (), stream);
       return true;
     }