[patch 1/2] Recognize DFP types in casts.

[Thiago Jung Bauermann <bauerman at br dot ibm dot com>]

Convinces GDB to recognize DFP types in casts when no binary with
debuginfo for DFP types is loaded.

Before:

(gdb) p (decimal float) 1
No symbol table is loaded.  Use the "file" command.

After:

(gdb) p (_Decimal32) 1
$1 = 1E-101

Don't worry about the result. It will be fixed in the next patch.

This should logically be part of the next patch, but the C parser is
scary code and I don't feel very confident that this is indeed the
right way to do it. It works, though, and introduces no regressions.

I am also not sure of the ChangeLog format for .y files.
Ok to commit?
-- 
[]'s
Thiago Jung Bauermann
Software Engineer
IBM Linux Technology Center


2007-12-19  Thiago Jung Bauermann  <bauerman@br.ibm.com>

	* c-exp.y: Add DECFLOAT_KEYWORD, DECDOUBLE_KEYWORD and DECLONG_KEYWORD
	for Decimal Floating Point types.
	Add typebase rule for DECFLOAT_KEYWORD, DECDOUBLE_KEYWORD and
	DECLONG_KEYWORD.
	(yylex): Recognize _Decimal32, _Decimal64 and _Decimal128 keywords.
	* gdbtypes.c (gdbtypes_post_init): Change names of decimal float types
	to conform to C extension for decimal float.

Index: src-git/gdb/c-exp.y
===================================================================
--- src-git.orig/gdb/c-exp.y	2007-10-26 14:00:29.000000000 -0200
+++ src-git/gdb/c-exp.y	2007-12-14 15:31:04.000000000 -0200
@@ -197,7 +197,7 @@ static int parse_number (char *, int, in
 
 /* Special type cases, put in to allow the parser to distinguish different
    legal basetypes.  */
-%token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
+%token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD DECFLOAT_KEYWORD DECDOUBLE_KEYWORD DECLONG_KEYWORD
 
 %token <voidval> VARIABLE
 
@@ -872,6 +872,12 @@ typebase  /* Implements (approximately):
 			{ $$ = builtin_type (current_gdbarch)->builtin_double; }
 	|	LONG DOUBLE_KEYWORD
 			{ $$ = builtin_type (current_gdbarch)->builtin_long_double; }
+	|	DECFLOAT_KEYWORD
+			{ $$ = builtin_type (current_gdbarch)->builtin_decfloat; }
+	|	DECDOUBLE_KEYWORD
+			{ $$ = builtin_type (current_gdbarch)->builtin_decdouble; }
+	|	DECLONG_KEYWORD
+			{ $$ = builtin_type (current_gdbarch)->builtin_declong; }
 	|	STRUCT name
 			{ $$ = lookup_struct (copy_name ($2),
 					      expression_context_block); }
@@ -1677,6 +1683,14 @@ yylex ()
   /* Catch specific keywords.  Should be done with a data structure.  */
   switch (namelen)
     {
+    case 11:
+      if (strncmp (tokstart, "_Decimal128", 11) == 0)
+	return DECLONG_KEYWORD;
+    case 10:
+      if (strncmp (tokstart, "_Decimal32", 10) == 0)
+	return DECFLOAT_KEYWORD;
+      if (strncmp (tokstart, "_Decimal64", 10) == 0)
+	return DECDOUBLE_KEYWORD;
     case 8:
       if (strncmp (tokstart, "unsigned", 8) == 0)
 	return UNSIGNED;
Index: src-git/gdb/gdbtypes.c
===================================================================
--- src-git.orig/gdb/gdbtypes.c	2007-12-10 16:10:58.000000000 -0200
+++ src-git/gdb/gdbtypes.c	2007-12-14 15:31:04.000000000 -0200
@@ -3122,15 +3122,15 @@ gdbtypes_post_init (struct gdbarch *gdba
   builtin_type->builtin_decfloat
     = init_type (TYPE_CODE_DECFLOAT, 32 / 8,
 	        0,
-	       "decimal float", (struct objfile *) NULL);
+	       "_Decimal32", (struct objfile *) NULL);
   builtin_type->builtin_decdouble
     = init_type (TYPE_CODE_DECFLOAT, 64 / 8,
 	       0,
-	       "decimal double", (struct objfile *) NULL);
+	       "_Decimal64", (struct objfile *) NULL);
   builtin_type->builtin_declong
     = init_type (TYPE_CODE_DECFLOAT, 128 / 8,
 	       0,
-	       "decimal long double", (struct objfile *) NULL);
+	       "_Decimal128", (struct objfile *) NULL);
 
   /* Pointer/Address types.  */
 

-- 
-- 
[]'s
Thiago Jung Bauermann
Software Engineer
IBM Linux Technology Center