By Donald E. Knuth (auth.), P. Deransart, M. Jourdan (eds.)
Attribute grammars have been brought over two decades in the past, yet they're nonetheless no longer as wide-spread as might have been was hoping in the beginning. this can be fairly so in undefined, regardless of their features as a specification software. the purpose of this overseas Workshop on characteristic Grammars and their purposes (WAGA), the 1st to be completely dedicated to this subject, used to be to teach that they're nonetheless the topic of energetic learn and now result in vital, helpful and functional functions in a variety of components. The workshop coated all features of characteristic grammars, with an emphasis on useful effects. This quantity comprises the textual content of the 3 invited talks and 21 submitted papers awarded on the workshop. this option offers a large view of the various study being performed within the sector. themes comprise: - Fundamentals: effective exhaustive and incremental at- tribute assessment tools, parallel review, area optimization, relationships with sensible, common sense and object-oriented programming, and structures. - Applications: compiler development, normal language processing, and interactive application manipulation.
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Extra resources for Attribute Grammars and their Applications: International Conference WAGA Paris, France, September 19–21, 1990 Proceedings
It is a trade-oﬀ between time and space. As space is our main diﬃculty, from our point of view this analysis should be used whenever possible. Since we do not use the X operator in our speciﬁcations, the loss of validity of the X operator (see ) is not a problem for us. The result of DVR is not that clear. In some examples it helped to save space and to decrease time (due to less states created), but whenever there is a tight coupling between data variables across functions and/or interrupt handlers, this option does not have an eﬀect.
For example, executing an add instruction usually creates just one successor. If in a state in which an add instruction is executed one interrupt is active, this state already has two successors. In one successor the interrupt handler is entered (interrupt occurred), and in the other successor the add instruction is executed (interrupt did not occur). Another example is an instruction reading input from the environment by means of an Input/Output (I/O) port. If the complete port is used for input (controlled by other registers), this state has 256 successors because an I/O port used in an ATmega16 is 8 bit wide, and hence, 256 diﬀerent values can be read from the environment through this port.
A state in [mc]square consists of the complete SRAM including all registers, I/O registers, variables, etc. , ﬁelds for formula values, list of successors, and ﬁelds needed for state-space creation which are not part of the SRAM). In case of the ATmega16 a state has up to 2 KB of data. , lossless compressions, hard disk model checking). , lazy stack evaluation, lazy interrupt evaluation, path reduction, dead variable reduction). All these options lead to the creation of fewer states. Some create an overapproximation, while others omit the creation of states which are not possible or irrelevant (still preserving a safe over-approximation).
Attribute Grammars and their Applications: International Conference WAGA Paris, France, September 19–21, 1990 Proceedings by Donald E. Knuth (auth.), P. Deransart, M. Jourdan (eds.)