1987-03-09 19:15:41 +00:00
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/*
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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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1984-11-26 13:43:22 +00:00
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/* I N T E R M E D I A T E C O D E
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*
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* L O O K - U P R O U T I N E S
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*/
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/* During Intermediate Code generation data label names ('symbols'),
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* procedure names and instruction labels (numbers) are translated
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* to resp. a data block pointer, a proc pointer and a label identifier.
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* We use three hash tables for this purpose (symhash, prochash, numhash).
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* Every name/number is hashed to an index in a specific table. A table
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* entry contains a list of structs (sym, prc, num), each one representing
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* a 'synonym'. (Synonyms are names/numbers having the same hash value).
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*/
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/* status passed as argument to look_up routines:
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* resp. used occurrence, defining occurrence, occurrence in
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* a MES ms_ext pseudo.
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*/
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#define OCCURRING 0
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#define DEFINING 1
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#define IMPORTING 2
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#define NSYMHASH 127
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#define NPROCHASH 127
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#define NNUMHASH 37
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extern sym_p symhash[];
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extern prc_p prochash[];
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extern num_p numhash[];
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extern lab_id instr_lab(); /* ( short number)
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* Maps EM labels to sequential
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* integers.
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*/
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extern dblock_p symlookup(); /* (char *ident, int status)
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* Look up the data block with
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* the given name.
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*/
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extern dblock_p getsym(); /* ( int status)
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* Read and look up a symbol.
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* If this is the first occurrence
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* of it, then make it external
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* (if status=OCCURRING) or
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* internal (if DEFINING).
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*/
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extern proc_p getproc(); /* (int status)
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* Same as getsym, but for procedure
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* names.
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*/
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extern proc_p proclookup(); /* ( char *ident, int status)
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* Find (in the hashtable) the
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* procedure with the given name.
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*/
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extern cleaninstrlabs(); /* ( )
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* Forget about all instruction labels.
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*/
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extern dump_procnames(); /* (prc_p hash[], int n, FILE *f)
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* Save the names of the procedures
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* in file f; hash is the hashtable
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* used and n is its length.
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*/
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extern cleanprocs(); /* (prc_p hash[], int n,mask)
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* Make the names of all procedures
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* for which p_flags1&mask = 0 invisible
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*/
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extern cleandblocks(); /* (sym_p hash[], int n)
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* Make the names of all data blocks
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* for which d_flags1&mask = 0 invisible
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*/
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