Target Language Compiler

Compatibility Issues

In bringing Target Language files from Release 11 to Release 12, the following changes may affect your TLC codebase:

• Nested evaluations are no longer supported. Expressions such as

%<LibBlockParameterValue(%<myVariable>,"", "", "")>

are no longer supported. You will have to convert these expressions into equivalent nonnested expressions.

• Aliases are no longer automatically created for Parameter blocks while reading in Real-Time Workshop files.
• You cannot change the contents of a "Default" record after it has been created. In the previous TLC, you could change a "Default" record and see the change in all the records that inherited from that default record.
• %codeblock and %endcodeblock constructs are no longer supported.
• %defines & macro constructs are no longer supported.
• Use of line continuation characters (... and \) are not allowed inside of strings. Also, to place a double quote (") character inside a string, you must use \". Previously, TLC allowed you to do """ to get a double quote in a string.
• Semantics have been formalized to %include files in different contexts (e.g., from generated files inside of %with blocks, etc.) %include statements are now treated as if the were read in from the global scope.
• The previous TLC had the ability to split function definitions (and other directives) across include file boundaries (e.g., you could start a %function in one file and %include a file that had the %endfunction). This no longer works.
• Nested functions are no longer allowed. For example,

%function foo ()
  %function bar ()
  %endfunction
%endfunction

• Recursive records are no longer allowed. For example,

Record1     {
  Val 2
  RefRecord2
}
Record2     {
  Val3
  RefRecord1
}

• Record declaration syntax has changed. The following code code fragments illustrate the differences between declaring a record recVar in previous versions of TLC and the current release.
• Previous versions:

%assign recVarAlias = recVar { ...
    field1  value1 ...
    field2  value2 ...
    ...
    fieldN  valueN ...
}

• Current version:

%createrecord recVar { ...
    field1  value1 ...
    field2  value2 ...
    ...
    fieldN  valueN ...
}

See Records for further information.

• Semantics of the EXISTS function have changed. In the previous release of TLC, EXISTS(var) would check if the variable represented by the string value in var existed. In the current release of TLC, EXISTS(var) checks to see if var exists or not.

To emulate the behavior of EXISTS in the previous release, replace

EXISTS(var) 

with

EXISTS("%<var>")

Target Language Compiler 4.0 New Features

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