Standalone Logtool for MPE/iX

printed as numeric data as indicated in the

FIELD`FORMAT

command.

Examples:

VALUE`LABELS [ 2 ] (1, "one"; 2, "two"; 3, "three")

[ 3 ] (-1, "Unlimited"; 1/14 "Half power")

[ 8 ] (-32768/-1, "Negative";

0/32767, "Positive")

VARIANT

This command must be provided for a TAG`ID definition. This command indicates which field of the RECORD`ID or

TAG`ID the current TAG`ID definition is to be used. The RECORD`ID definition must contain a field declared as a

tag. For example, a RECORD`ID must have a field similar to the following:

FIELD`FORMAT (8,INT,10,TAG,64)

In this example, we have an 8-bit tag field (to be printed in decimal) followed by 64 bits of variant data. The VARIANT

command will identify the RECORD`ID that the current TAG`ID is to be used with by a field number and value

range. The VARIANT command will identify the TAG`ID containing a tag data type by a list of field number and value

range pairs, which will specify the path to the current TAG`ID.

Error checking is performed to ensure that only TAG data types have variants. The value associated with a tag is not

limited to a single value, but a range of values may be specified for a tag. All ranges must be unique and may not

overlap with any other value or range.

Syntax:

VARIANT <variant def>

<label index> ::= [ <field#> ]

<value> ::= an integer

<field#> ::= an integer

Examples:

VARIANT [ 1 ] (1/100)

[ 3 ] (-5 ) {This example is for a TAG`ID which

has a variant field}

Tag Usage Example

The system log file is expected to contain data structures as defined in PASCAL. In order to handle Pascal case variant

records, the notion of TAGs has been provided. In the following example, a record definition file will be written for

the PASCAL record "MY_RECORD."

TYPE

some_other_type = integer; { 32 bits }

yet_another_type = RECORD

count : integer; { 32 bits }

name : string[4]; { (4 " 8 bits) + 64 bit overhead }

CASE stuff : integer OF { 32 bits }

0 : ( f1 : integer ); { 32 bits }

1 : ( f2 : bit8 ); { 8 bits }

END; { SIZEOF = 192 bits }

YET_ANOTHER_TYPE MAX RECORD SIZE = x18 BYTES

COUNT x0.0 @ 4.0