The Chill Datatype- (Mode) support of GDB is directly related
with the functionality of the GNU Chill compiler, and therefore deviates
slightly from the standard specification of the Chill language. The
provided modes are:
Discrete modes:
Integer Modes which are predefined by BYTE, UBYTE, INT,
UINT, LONG, ULONG,
Boolean Mode which is predefined by BOOL,
Character Mode which is predefined by CHAR,
Set Mode which is displayed by the keyword SET.
(gdb) ptype x
type = SET (karli = 10, susi = 20, fritzi = 100)
If the type is an unnumbered set the set element values are omitted.
Range Mode which is displayed by
type = <basemode>(<lower bound> : <upper bound>)
where <lower bound>, <upper bound> can be of any discrete literal
expression (e.g. set element names).
Powerset Mode:
A Powerset Mode is displayed by the keyword POWERSET followed by
the member mode of the powerset. The member mode can be any discrete mode.
(gdb) ptype x
type = POWERSET SET (egon, hugo, otto)
Reference Modes:
Bound Reference Mode which is displayed by the keyword REF
followed by the mode name to which the reference is bound.
Free Reference Mode which is displayed by the keyword PTR.
Procedure mode
The procedure mode is displayed by type = PROC(<parameter list>)
<return mode> EXCEPTIONS (<exception list>). The <parameter
list> is a list of the parameter modes. <return mode> indicates
the mode of the result of the procedure if any. The exceptionlist lists
all possible exceptions which can be raised by the procedure.
Synchronization Modes:
Event Mode which is displayed by
EVENT (<event length>)
where (<event length>) is optional.
Buffer Mode which is displayed by
BUFFER (<buffer length>)<buffer element mode>
where (<buffer length>) is optional.
Timing Modes:
Duration Mode which is predefined by DURATION
Absolute Time Mode which is predefined by TIME
Real Modes:
Real Modes are predefined with REAL and LONG_REAL.
String Modes:
Character String Mode which is displayed by
CHARS(<string length>)
followed by the keyword VARYING if the String Mode is a varying
mode
Bit String Mode which is displayed by
BOOLS(<string
length>)
Array Mode:
The Array Mode is displayed by the keyword ARRAY(<range>)
followed by the element mode (which may in turn be an array mode).
(gdb) ptype x
type = ARRAY (1:42)
ARRAY (1:20)
SET (karli = 10, susi = 20, fritzi = 100)
Structure Mode
The Structure mode is displayed by the keyword STRUCT(<field
list>). The <field list> consists of names and modes of fields
of the structure. Variant structures have the keyword CASE <field>
OF <variant fields> ESAC in their field list. Since the current version
of the GNU Chill compiler doesn't implement tag processing (no runtime
checks of variant fields, and therefore no debugging info), the output
always displays all variant fields.
(gdb) ptype str
type = STRUCT (
as x,
bs x,
CASE bs OF
(karli):
cs a
(ott):
ds x
ESAC
)
