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              Inter-Office Memorandum

    To        Mesa Users                               Date           May 31, 1978


    From      Barbara Koalkin                          Location       Palo Alto


    Subject   Mesa 4.0 Debugger Update                 Organization   SDD/SD


XEROX
    Filed on: [IRIS]DOC>DEBUGGER40.BRAVO




    This release of the Mesa debugger introduces many changes of interest and importance to all
    Mesa programmers. The purpose of this memo is to make you aware of the changes that
    have taken place. More complete explanations may be found in the Mesa Debugger
    Documentation.

    Interpreter

    The major addition to the Mesa 4.0 debugger is an interpreter that handles a subset of the
    Mesa language; it is useful for common operations such as assignments, dereferencing,
    indexing, field access, addressing, and simple type conversion. It is a powerful extension to
    the current debugger command language, as it allows you to more closely specify your
    variables while debugging, thus giving you more complete information with fewer
    keystrokes. A subset of the Mesa language has been specified as being acceptable to the
    interpreter (a copy of the grammar is attached to this memo).

    Statement Syntax

    Typing space (sp) to the command processor enables interpreting mode. At this point the
    debugger is ready to interpret any expression that is valid in the (debugger) grammar.

    Multiple statements are separated by semicolons; the last statement on a line should be
    followed by a carriage return (CR). If the statement is a simple expression (ie., not an
    assignment), the result is displayed after evaluation.

    For example, to perform an assignment and print the result in one command, you would
    type foo +- expj foo.

    Loopholes

    A more concise LOOPHOLE notation has been introduced to make it easy to display arbitrary
    data in any format. The character "%" is used to denote LOOPHolE[exp, type], with the
    expression on the left of the %, and the type on the right.

    For example, the expression foo % short red Foo means LOOPHOLE the type of the variable
    foo to be a short red Foo and display its value.

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