[commit] Use true boolean types in Ada

[Paul Hilfinger <Hilfinger at adacore dot com>]

I have committed the following patch (posted 8/8, modified according to 
suggestions from Bauermann). 

Eli,  Oops! I had overlooked your message.  I'll add something to NEWS, but
the user-visible portion of the change is so obscure (having to do with
cases where one (re)defines True and False in one's program) that I am
reluctant to add it to the manual.

Paul Hilfinger

2008-08-19  Paul N. Hilfinger  <hilfinger@adacore.com>

	* ada-lang.c (discrete_type_high_bound,discrete_type_low_bound): Change 
	API to return LONGEST values rather than struct values.
	(ada_evaluate_subexp): Change to use new API of discrete_type_low_bound
	and discrete_type_high_bound.
	(to_fixed_range_type): Create a range type in cases where 
	argument is base type and its limits are representable as ints.
	(ada_is_modular_type): Correct so that base type must be integral.
	* ada-lex.l (TRUEKEYWORD,FALSEKEYWORD): Make 'true' and 'false' 
	keywords when they appear alone, since we are phasing out 
	direct representation of these identifiers in ebugging data.
	* ada-exp.y: Define 'true' and 'false' as primaries.
	(type_boolean): New function.
	(type_int,type_long,type_long_long,type_floattype_double)
	(type_long_double): Remove uses of current_gdbarch for consistency
	with type_boolean.
	(write_int): Change comment to indicate that it might write boolean 
	constant as well.
	* ada-typeprint.c (ada_print_type): Print '(false, true)' for boolean
	type, since will no longer be represented as enumerated type in 
	debugging data.
	* ada-valprint.c (print_optional_low_bound): Handle boolean case
	as well.


Index: gdb/ada-exp.y
===================================================================
RCS file: /cvs/src/src/gdb/ada-exp.y,v
retrieving revision 1.28
diff -u -p -r1.28 ada-exp.y
--- gdb/ada-exp.y	27 May 2008 19:29:51 -0000	1.28
+++ gdb/ada-exp.y	19 Aug 2008 10:03:08 -0000
@@ -153,6 +153,8 @@ static struct type *type_long_double (vo
 
 static struct type *type_char (void);
 
+static struct type *type_boolean (void);
+
 static struct type *type_system_address (void);
 
 %}
@@ -180,6 +182,7 @@ static struct type *type_system_address 
 
 %token <typed_val> INT NULL_PTR CHARLIT
 %token <typed_val_float> FLOAT
+%token TRUEKEYWORD FALSEKEYWORD
 %token COLONCOLON
 %token <sval> STRING NAME DOT_ID 
 %type <bval> block
@@ -602,6 +605,12 @@ primary	:	STRING
 			}
 	;
 
+primary :	TRUEKEYWORD
+			{ write_int (1, type_boolean ()); }
+        |	FALSEKEYWORD
+			{ write_int (0, type_boolean ()); }
+	;
+
 primary	: 	NEW NAME
 			{ error (_("NEW not implemented.")); }
 	;
@@ -820,7 +829,7 @@ write_var_from_sym (struct block *orig_l
   write_exp_elt_opcode (OP_VAR_VALUE);
 }
 
-/* Write integer constant ARG of type TYPE.  */
+/* Write integer or boolean constant ARG of type TYPE.  */
 
 static void
 write_int (LONGEST arg, struct type *type)
@@ -1455,37 +1464,37 @@ convert_char_literal (struct type *type,
 static struct type *
 type_int (void)
 {
-  return builtin_type (current_gdbarch)->builtin_int;
+  return builtin_type_int;
 }
 
 static struct type *
 type_long (void)
 {
-  return builtin_type (current_gdbarch)->builtin_long;
+  return builtin_type_long;
 }
 
 static struct type *
 type_long_long (void)
 {
-  return builtin_type (current_gdbarch)->builtin_long_long;
+  return builtin_type_long_long;
 }
 
 static struct type *
 type_float (void)
 {
-  return builtin_type (current_gdbarch)->builtin_float;
+  return builtin_type_float;
 }
 
 static struct type *
 type_double (void)
 {
-  return builtin_type (current_gdbarch)->builtin_double;
+  return builtin_type_double;
 }
 
 static struct type *
 type_long_double (void)
 {
-  return builtin_type (current_gdbarch)->builtin_long_double;
+  return builtin_type_long_double;
 }
 
 static struct type *
@@ -1495,6 +1504,12 @@ type_char (void)
 }
 
 static struct type *
+type_boolean (void)
+{
+  return builtin_type_bool;
+}
+
+static struct type *
 type_system_address (void)
 {
   struct type *type 
Index: gdb/ada-lang.c
===================================================================
RCS file: /cvs/src/src/gdb/ada-lang.c,v
retrieving revision 1.152
diff -u -p -r1.152 ada-lang.c
--- gdb/ada-lang.c	16 Aug 2008 09:26:25 -0000	1.152
+++ gdb/ada-lang.c	19 Aug 2008 10:03:13 -0000
@@ -621,39 +621,40 @@ min_of_type (struct type *t)
 }
 
 /* The largest value in the domain of TYPE, a discrete type, as an integer.  */
-static struct value *
+static LONGEST
 discrete_type_high_bound (struct type *type)
 {
   switch (TYPE_CODE (type))
     {
     case TYPE_CODE_RANGE:
-      return value_from_longest (TYPE_TARGET_TYPE (type),
-                                 TYPE_HIGH_BOUND (type));
+      return TYPE_HIGH_BOUND (type);
     case TYPE_CODE_ENUM:
-      return
-        value_from_longest (type,
-                            TYPE_FIELD_BITPOS (type,
-                                               TYPE_NFIELDS (type) - 1));
+      return TYPE_FIELD_BITPOS (type, TYPE_NFIELDS (type) - 1);
+    case TYPE_CODE_BOOL:
+      return 1;
+    case TYPE_CODE_CHAR:
     case TYPE_CODE_INT:
-      return value_from_longest (type, max_of_type (type));
+      return max_of_type (type);
     default:
       error (_("Unexpected type in discrete_type_high_bound."));
     }
 }
 
 /* The largest value in the domain of TYPE, a discrete type, as an integer.  */
-static struct value *
+static LONGEST
 discrete_type_low_bound (struct type *type)
 {
   switch (TYPE_CODE (type))
     {
     case TYPE_CODE_RANGE:
-      return value_from_longest (TYPE_TARGET_TYPE (type),
-                                 TYPE_LOW_BOUND (type));
+      return TYPE_LOW_BOUND (type);
     case TYPE_CODE_ENUM:
-      return value_from_longest (type, TYPE_FIELD_BITPOS (type, 0));
+      return TYPE_FIELD_BITPOS (type, 0);
+    case TYPE_CODE_BOOL:
+      return 0;
+    case TYPE_CODE_CHAR:
     case TYPE_CODE_INT:
-      return value_from_longest (type, min_of_type (type));
+      return min_of_type (type);
     default:
       error (_("Unexpected type in discrete_type_low_bound."));
     }
@@ -8977,9 +8978,11 @@ ada_evaluate_subexp (struct type *expect
               default:
                 error (_("unexpected attribute encountered"));
               case OP_ATR_FIRST:
-                return discrete_type_low_bound (range_type);
+		return value_from_longest 
+		  (range_type, discrete_type_low_bound (range_type));
               case OP_ATR_LAST:
-                return discrete_type_high_bound (range_type);
+                return value_from_longest
+		  (range_type, discrete_type_high_bound (range_type));
               case OP_ATR_LENGTH:
                 error (_("the 'length attribute applies only to array types"));
               }
@@ -9500,7 +9503,16 @@ to_fixed_range_type (char *name, struct 
 
   subtype_info = strstr (name, "___XD");
   if (subtype_info == NULL)
-    return raw_type;
+    {
+      LONGEST L = discrete_type_low_bound (raw_type);
+      LONGEST U = discrete_type_high_bound (raw_type);
+      if (L < INT_MIN || U > INT_MAX)
+	return raw_type;
+      else
+	return create_range_type (alloc_type (objfile), raw_type, 
+				  discrete_type_low_bound (raw_type),
+				  discrete_type_high_bound (raw_type));
+    }
   else
     {
       static char *name_buf = NULL;
@@ -9587,7 +9599,7 @@ ada_is_modular_type (struct type *type)
   struct type *subranged_type = base_type (type);
 
   return (subranged_type != NULL && TYPE_CODE (type) == TYPE_CODE_RANGE
-          && TYPE_CODE (subranged_type) != TYPE_CODE_ENUM
+          && TYPE_CODE (subranged_type) == TYPE_CODE_INT
           && TYPE_UNSIGNED (subranged_type));
 }
 
Index: gdb/ada-lex.l
===================================================================
RCS file: /cvs/src/src/gdb/ada-lex.l,v
retrieving revision 1.21
diff -u -p -r1.21 ada-lex.l
--- gdb/ada-lex.l	9 Jan 2008 19:27:15 -0000	1.21
+++ gdb/ada-lex.l	19 Aug 2008 10:03:13 -0000
@@ -178,6 +178,16 @@ rem		{ return REM; }
 then		{ return THEN; }
 xor		{ return XOR; }
 
+	/* BOOLEAN "KEYWORDS" */
+
+ /* True and False are not keywords in Ada, but rather enumeration constants.
+    However, the boolean type is no longer represented as an enum, so True
+    and False are no longer defined in symbol tables.  We compromise by
+    making them keywords (when bare). */
+
+true		{ return TRUEKEYWORD; }
+false		{ return FALSEKEYWORD; }
+
         /* ATTRIBUTES */
 
 {TICK}[a-zA-Z][a-zA-Z]+ { return processAttribute (yytext+1); }
Index: gdb/ada-typeprint.c
===================================================================
RCS file: /cvs/src/src/gdb/ada-typeprint.c,v
retrieving revision 1.19
diff -u -p -r1.19 ada-typeprint.c
--- gdb/ada-typeprint.c	4 Jan 2008 20:45:05 -0000	1.19
+++ gdb/ada-typeprint.c	19 Aug 2008 10:03:13 -0000
@@ -813,6 +813,9 @@ ada_print_type (struct type *type0, char
       case TYPE_CODE_ARRAY:
 	print_array_type (type, stream, show, level);
 	break;
+      case TYPE_CODE_BOOL:
+	fprintf_filtered (stream, "(false, true)");
+	break;
       case TYPE_CODE_INT:
 	if (ada_is_fixed_point_type (type))
 	  print_fixed_point_type (type, stream);
Index: gdb/ada-valprint.c
===================================================================
RCS file: /cvs/src/src/gdb/ada-valprint.c,v
retrieving revision 1.37
diff -u -p -r1.37 ada-valprint.c
--- gdb/ada-valprint.c	23 May 2008 18:13:35 -0000	1.37
+++ gdb/ada-valprint.c	19 Aug 2008 10:03:14 -0000
@@ -112,6 +112,10 @@ print_optional_low_bound (struct ui_file
 
   switch (TYPE_CODE (index_type))
     {
+    case TYPE_CODE_BOOL:
+      if (low_bound == 0)
+	return 0;
+      break;
     case TYPE_CODE_ENUM:
       if (low_bound == TYPE_FIELD_BITPOS (index_type, 0))
 	return 0;