56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* U S E - D E F I N I T I O N A N A L Y S I S
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*
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* U D _ D E F S . H
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*/
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extern short nrdefs; /* total number of definitions */
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extern short nrexpldefs; /* number of explicit definitions */
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extern line_p *defs; /* map of explicit definitions */
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extern cset *vardefs; /* set of explicit defs. of all variables */
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extern make_defs(); /* (proc_p p)
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* Compute defs[], vardefs[]
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* and CHGVARS(b) (for every b).
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*/
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extern gen_sets(); /* (proc_p p)
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* Compute GEN(b) (for every b).
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*/
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extern kill_sets(); /* (proc_p p)
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*Compute KILL(b) (for every b).
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*/
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extern bool does_expl_def(); /* (line_p l)
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* See if instruction l does an explicit
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* definition (e.g. a STL).
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*/
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extern bool does_impl_def(); /* (line_p l)
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* See if instruction l does an implicit
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* definition (e.g. a CAL).
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*/
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/* Two kinds of definitions exist:
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* - an explicit definition is an assignment to a single
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* variable (e.g. a STL, STE, INE).
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* - an implicit definition is an assignment to a variable
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* performed via a subroutine call or an
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* indirect assignment (through a pointer).
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* Every explicit definition has an 'explicit definition number',
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* which is its index in the 'defs' table.
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* Every implicit definition has an 'implicit definition number',
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* which is the 'variable number' of the changed variable.
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* Every such definition also has a 'definition number'.
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* Conversions exist between these numbers.
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*/
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#define TO_EXPLICIT(defnr) (defnr - nrvars)
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#define TO_IMPLICIT(defnr) (defnr)
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#define EXPL_TO_DEFNR(explnr) (explnr + nrvars)
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#define IMPL_TO_DEFNR(implnr) (implnr)
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#define IMPLICIT_DEF(v) (v)
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#define IMPL_VAR(defnr) (defnr)
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#define IS_IMPL_DEF(defnr) (defnr <= nrvars)
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