New field la_varobj_ops in struct language_defn

This is a follow-up series to move language stuff out of varobj.c.

This patch adds a new field la_varobj_ops in struct language_defn so
that each language has varobj-related options.  Not every language
supports varobj, and the operations are identical to operations of c
languages.

'struct language_defn' is the ideal place to save all language-related
operations.  After this patch, some cleanups can be done in patch 2/2,
which removes language-related stuff completely from varobj.c.

Regression tested on x86_64-linux.

gdb:

2013-10-25  Yao Qi  <yao@codesourcery.com>

	* language.h (struct lang_varobj_ops): Declare.
	(struct language_defn) <la_varobj_ops>: New field.
	* ada-lang.c: Include "varobj.h"
	(defn ada_language_defn): Initialize field 'la_varobj_ops' by
	ada_varobj_ops.
	* c-lang.c: Include "varobj.h"
	(c_language_defn): Initialize field 'la_varobj_ops' by
	c_varobj_ops.
	(cplus_language_defn): Initialize field 'la_varobj_ops' by
	cplus_varobj_ops.
	(asm_language_defn): Initialize field 'la_varobj_ops' by
	default_varobj_ops.
	(minimal_language_defn): Likewise.
	* d-lang.c (d_language_defn): Likewise.
	* f-lang.c (f_language_defn): Likewise.
	* go-lang.c (go_language_defn): Likewise.
	* m2-lang.c (m2_language_defn): Likewise.
	* objc-lang.c (objc_language_defn): Likewise.
	* opencl-lang.c (opencl_language_defn): Likewise.
	* p-lang.c (pascal_language_defn): Likewise.
	* language.c (unknown_language_defn): Likewise.
	(auto_language_defn): Likewise.
	(local_language_defn): Likewise.
	* jv-lang.c (java_language_defn): Initialize field
	'la_varobj_ops' by java_varobj_ops.
	* varobj.c (varobj_create): Update.
	* varobj.h (default_varobj_ops): Define macro.

gdb/ChangeLog

@@ -1,3 +1,33 @@
+2013-10-25  Yao Qi  <yao@codesourcery.com>
+
+	* language.h (struct lang_varobj_ops): Declare.
+	(struct language_defn) <la_varobj_ops>: New field.
+	* ada-lang.c: Include "varobj.h"
+	(defn ada_language_defn): Initialize field 'la_varobj_ops' with
+	ada_varobj_ops.
+	* c-lang.c: Include "varobj.h"
+	(c_language_defn): Initialize field 'la_varobj_ops' with
+	c_varobj_ops.
+	(cplus_language_defn): Initialize field 'la_varobj_ops' with
+	cplus_varobj_ops.
+	(asm_language_defn): Initialize field 'la_varobj_ops' with
+	default_varobj_ops.
+	(minimal_language_defn): Likewise.
+	* d-lang.c (d_language_defn): Likewise.
+	* f-lang.c (f_language_defn): Likewise.
+	* go-lang.c (go_language_defn): Likewise.
+	* m2-lang.c (m2_language_defn): Likewise.
+	* objc-lang.c (objc_language_defn): Likewise.
+	* opencl-lang.c (opencl_language_defn): Likewise.
+	* p-lang.c (pascal_language_defn): Likewise.
+	* language.c (unknown_language_defn): Likewise.
+	(auto_language_defn): Likewise.
+	(local_language_defn): Likewise.
+	* jv-lang.c (java_language_defn): Initialize field
+	'la_varobj_ops' with java_varobj_ops.
+	* varobj.c (varobj_create): Update.
+	* varobj.h (default_varobj_ops): Define macro.
+
 2013-10-25  Pedro Alves  <palves@redhat.com>
 
 	* cp-valprint.c (cp_print_value_fields): No longer handle a NULL

gdb/ada-lang.c

@@ -32,6 +32,7 @@
 #include "expression.h"
 #include "parser-defs.h"
 #include "language.h"
+#include "varobj.h"
 #include "c-lang.h"
 #include "inferior.h"
 #include "symfile.h"
@@ -12834,6 +12835,7 @@ const struct language_defn ada_language_defn = {
   c_get_string,
   ada_get_symbol_name_cmp,	/* la_get_symbol_name_cmp */
   ada_iterate_over_symbols,
+  &ada_varobj_ops,
   LANG_MAGIC
 };
 

gdb/c-lang.c

@@ -23,6 +23,7 @@
 #include "expression.h"
 #include "parser-defs.h"
 #include "language.h"
+#include "varobj.h"
 #include "c-lang.h"
 #include "valprint.h"
 #include "macroscope.h"
@@ -846,6 +847,7 @@ const struct language_defn c_language_defn =
   c_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &c_varobj_ops,
   LANG_MAGIC
 };
 
@@ -969,6 +971,7 @@ const struct language_defn cplus_language_defn =
   c_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &cplus_varobj_ops,
   LANG_MAGIC
 };
 
@@ -1010,6 +1013,7 @@ const struct language_defn asm_language_defn =
   c_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 
@@ -1056,6 +1060,7 @@ const struct language_defn minimal_language_defn =
   c_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/d-lang.c

@@ -20,6 +20,7 @@
 #include "defs.h"
 #include "symtab.h"
 #include "language.h"
+#include "varobj.h"
 #include "d-lang.h"
 #include "c-lang.h"
 #include "gdb_string.h"
@@ -274,6 +275,7 @@ static const struct language_defn d_language_defn =
   c_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/f-lang.c

@@ -27,6 +27,7 @@
 #include "expression.h"
 #include "parser-defs.h"
 #include "language.h"
+#include "varobj.h"
 #include "f-lang.h"
 #include "valprint.h"
 #include "value.h"
@@ -273,6 +274,7 @@ const struct language_defn f_language_defn =
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/go-lang.c

@@ -38,6 +38,7 @@
 #include "block.h"
 #include "symtab.h"
 #include "language.h"
+#include "varobj.h"
 #include "go-lang.h"
 #include "c-lang.h"
 #include "parser-defs.h"
@@ -596,6 +597,7 @@ static const struct language_defn go_language_defn =
   c_get_string,
   NULL,
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/jv-lang.c

@@ -31,6 +31,7 @@
 #include "value.h"
 #include "c-lang.h"
 #include "jv-lang.h"
+#include "varobj.h"
 #include "gdbcore.h"
 #include "block.h"
 #include "demangle.h"
@@ -1196,6 +1197,7 @@ const struct language_defn java_language_defn =
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &java_varobj_ops,
   LANG_MAGIC
 };
 

gdb/language.c

@@ -38,6 +38,7 @@
 #include "gdbcmd.h"
 #include "expression.h"
 #include "language.h"
+#include "varobj.h"
 #include "target.h"
 #include "parser-defs.h"
 #include "jv-lang.h"
@@ -826,6 +827,7 @@ const struct language_defn unknown_language_defn =
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 
@@ -869,6 +871,7 @@ const struct language_defn auto_language_defn =
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 
@@ -910,6 +913,7 @@ const struct language_defn local_language_defn =
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/language.h

@@ -31,6 +31,7 @@ struct expression;
 struct ui_file;
 struct value_print_options;
 struct type_print_options;
+struct lang_varobj_ops;
 
 #define MAX_FORTRAN_DIMS  7	/* Maximum number of F77 array dims.  */
 
@@ -344,6 +345,9 @@ struct language_defn
 				     symbol_found_callback_ftype *callback,
 				     void *data);
 
+    /* Various operations on varobj.  */
+    const struct lang_varobj_ops *la_varobj_ops;
+
     /* Add fields above this point, so the magic number is always last.  */
     /* Magic number for compat checking.  */
 

gdb/m2-lang.c

@@ -23,6 +23,7 @@
 #include "expression.h"
 #include "parser-defs.h"
 #include "language.h"
+#include "varobj.h"
 #include "m2-lang.h"
 #include "c-lang.h"
 #include "valprint.h"
@@ -391,6 +392,7 @@ const struct language_defn m2_language_defn =
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/objc-lang.c

@@ -26,6 +26,7 @@
 #include "expression.h"
 #include "parser-defs.h"
 #include "language.h"
+#include "varobj.h"
 #include "c-lang.h"
 #include "objc-lang.h"
 #include "exceptions.h"
@@ -389,6 +390,7 @@ const struct language_defn objc_language_defn = {
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/opencl-lang.c

@@ -26,6 +26,7 @@
 #include "parser-defs.h"
 #include "symtab.h"
 #include "language.h"
+#include "varobj.h"
 #include "c-lang.h"
 #include "gdb_assert.h"
 
@@ -1137,6 +1138,7 @@ const struct language_defn opencl_language_defn =
   c_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/p-lang.c

@@ -26,6 +26,7 @@
 #include "expression.h"
 #include "parser-defs.h"
 #include "language.h"
+#include "varobj.h"
 #include "p-lang.h"
 #include "valprint.h"
 #include "value.h"
@@ -449,6 +450,7 @@ const struct language_defn pascal_language_defn =
   default_get_string,
   NULL,				/* la_get_symbol_name_cmp */
   iterate_over_symbols,
+  &default_varobj_ops,
   LANG_MAGIC
 };
 

gdb/varobj.c

@@ -318,7 +318,6 @@ varobj_create (char *objname,
       struct frame_id old_id = null_frame_id;
       struct block *block;
       const char *p;
-      enum varobj_languages lang;
       struct value *value = NULL;
       volatile struct gdb_exception except;
       CORE_ADDR pc;
@@ -433,8 +432,7 @@ varobj_create (char *objname,
 	  }
 
       /* Set language info */
-      lang = variable_language (var);
+      var->root->lang = var->root->exp->language_defn->la_varobj_ops;
-      var->root->lang = languages[lang];
 
       install_new_value (var, value, 1 /* Initial assignment */);
 

gdb/varobj.h

@@ -230,6 +230,7 @@ const struct lang_varobj_ops cplus_varobj_ops;
 const struct lang_varobj_ops java_varobj_ops;
 const struct lang_varobj_ops ada_varobj_ops;
 
+#define default_varobj_ops c_varobj_ops
 /* API functions */
 
 extern struct varobj *varobj_create (char *objname,