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util/LLgen/src/types.h
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util/LLgen/src/types.h
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/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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/*
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* L L G E N
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*
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* An Extended LL(1) Parser Generator
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*
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* Author : Ceriel J.H. Jacobs
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*/
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/*
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* types.h $Header$
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* Type and structure definitions
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*/
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typedef int *p_set; /* pointer to bitset */
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typedef char *p_mem; /* pointer to some core */
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typedef char *string;
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/*
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* structure for a token
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*/
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typedef struct token {
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int t_tokno; /* Lexical token number */
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union {
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string t_s; /* Attribute is either a string or */
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int t_v; /* an integer */
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} t_x;
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# define t_string t_x.t_s
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# define t_num t_x.t_v
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} t_token;
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/*
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* structure for the grammar elements
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*/
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typedef struct gram {
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short x; /* for lay-out see comment below */
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short g_lineno; /* element found on this line number */
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} t_gram,*p_gram;
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/*
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* Layout of the field x:
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*
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* 15 13 12 9 8 0
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* ------------------------------------------
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* | type | nparams | index |
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* ------------------------------------------
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* of
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* 15 13 12 0
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* ------------------------------------------
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* | type | index |
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* ------------------------------------------
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* dependant on type
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*/
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# define UNDEFINED 000777
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# define EORULE 00 /* End of (sub)rule */
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# define ACTION 01 /* Imbedded action */
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# define NONTERM 02 /* A nonterminal */
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# define TERMINAL 03 /* A terminal */
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# define TERM 04 /* Something between square brackets */
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# define ALTERNATION 05 /* Alternation (|) */
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/*
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* Access macros for the x-field of a grammar element
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*/
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# define g_init(p) {(p)->x = 0;}
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# define g_gettype(p) (((p)->x>>13)&07)
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# define g_getcont(p) ((p)->x&017777)
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# define g_getnont(p) ((p)->x&0777)
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# define g_getnpar(p) (((p)->x>>9)&07)
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# define g_settype(p,s) { assert(((unsigned)(s))<=07);(p)->x=((p)->x&017777)|((s)<<13);}
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# define g_setcont(p,s) { assert(((unsigned)(s))<=017777);(p)->x=((p)->x&0160000)|(s);}
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# define g_setnont(p,s) { assert(((unsigned)(s))<=0777);(p)->x=((p)->x&0177000)|(s);}
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# define g_setnpar(p,s) { assert(((unsigned)(s))<=07);(p)->x=((p)->x&0170777)|((s)<<9);}
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/*
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* Some constants to communicate with the symbol table search routine
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*/
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# define LITERAL 01 /* Not equal to NONTERM or TERMINAL */
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# define UNKNOWN 00 /* Not equal to NONTERM, TERMINAL or LITERAL */
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/*
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* Some constants for safety
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*/
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# define SAFE 0
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# define SAFESCANDONE 1
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# define SCANDONE 2
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# define NOSCANDONE 3
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# define NOSAFETY 4
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/*
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* nonterminal structure
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*/
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typedef struct {
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short n_flags; /* low order three bits are reserved
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* for "safety" information,
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* the next three bits are reserved for
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* the parameter count
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*/
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# define getntsafe(f) ((f)&07)
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# define setntsafe(p,i) {assert(((unsigned)(i))<=7);*(p)&=~07;*(p)|=(i);}
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# define RECURSIVE 00100 /* Set if the default rule is recursive */
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# define NNOSCAN 00200 /* Set if the nonterminal does not scan ahead */
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# define CONTIN 00400 /* continuation already computed? */
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# define BUSY 01000 /* or are we busy computing it? */
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# define PARAMS 02000 /* tells if a nonterminal has parameters */
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# define PRODUCE 04000 /* tells if a nonterminal produces anything */
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# define EMPTY 010000 /* tells if a nonterminal produces empty */
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# define LOCALS 020000 /* local declarations ? */
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# define REACHABLE 040000 /* can this nonterminal be reached ? */
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# define VERBOSE 0100000 /* Set if in LL.output file */
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short n_count; /* pieces of code before this rule */
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int n_lineno; /* declared on line ... */
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p_gram n_rule; /* pointer to right hand side of rule */
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union {
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p_set n_f; /* ptr to "first" set */
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string n_s; /* If this nonterminal is not declared,
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* This field indicates the filename in
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* which it occurred
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*/
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} n_x;
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# define n_first n_x.n_f
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# define n_string n_x.n_s
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p_set n_follow; /* pointer to the "follow" set */
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p_set n_contains; /* pointer to symbols that can be produced */
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} t_nont, *p_nont;
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/*
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* hash table structure
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*/
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typedef struct h_entry {
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string h_name; /* pointer to name */
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int h_num; /* numbering of terminals */
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struct h_entry *h_next; /* next in hash chain */
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} t_entry, *p_entry;
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/*
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* link structure to link alternations
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*/
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typedef struct link {
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unsigned int l_flag;
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# define COND 01 /* Set if this alternative has a %if */
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# define DEF 02 /* This alternative is default */
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# define PREFERING 010 /* %prefer */
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# define AVOIDING 020 /* %avoid */
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# define NOCONF 01000 /* Set if there is a resolver without
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* conflict
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*/
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p_gram l_rule; /* pointer to this rule */
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p_set l_symbs; /* set, when to take this rule */
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p_set l_others; /* set, when to take another rule */
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} t_link, *p_link;
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/*
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* Structure for a repitition specification
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*/
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typedef short t_reps,*p_reps;
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# define FIXED 00 /* a fixed number */
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# define STAR 01 /* 0 or more times */
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# define PLUS 02 /* 1 or more times */
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# define OPT 03 /* 0 or 1 times */
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/*
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* Access macros for repitition
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*/
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# define r_init(p) {*(p)=0;}
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# define r_getkind(p) (*(p)&03)
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# define r_getnum(p) ((*(p)>>2)&037777)
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# define r_setkind(p,s) { assert(((unsigned)(s))<=03);*(p)=(*(p)&0177774)|(s);}
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# define r_setnum(p,s) { assert(((unsigned)(s))<=037777);*(p)=(*(p)&03)|((s)<<2);}
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/*
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* header structure for a term
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*/
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typedef struct term {
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t_reps t_reps; /* repeats ? */
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short t_flags;
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# define PERSISTENT 010 /* Set if this term has %persistent */
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# define RESOLVER 020 /* Set if this term has %while */
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# define EMPTYFIRST 0100 /* Error, empty first */
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# define EMPTYTERM 0200 /* Error, term can produce empty */
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# define TNOSCAN 0400 /* Set if this term does not scan ahead */
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/* # define NOCONF 01000 see link structure */
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p_gram t_rule; /* pointer to this term */
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p_set t_follow; /* set of followers */
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p_set t_first; /* set of firsts */
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p_set t_contains;
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} t_term, *p_term;
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/*
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* structure for firstmacros list
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*/
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typedef struct ff_firsts {
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string ff_name; /* Name of the macro */
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p_nont ff_nont; /* for this nonterminal */
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struct ff_firsts *ff_next;
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} t_first, *p_first;
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/*
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* structure for start symbol list
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*/
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typedef t_first t_start;
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typedef p_first p_start;
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/*
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* structure for file names and info
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*/
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typedef struct f_file {
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string f_name; /* File name */
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p_first f_firsts; /* ptr to list of firstmacros that must be
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* generated in the target file for this
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* grammar file
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*/
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short *f_start,*f_end;/* pointers in the "order" array,
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* Indicating which nonterminals were defined
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* in this file
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*/
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} t_file, *p_file;
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# ifdef NDEBUG
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# define STATIC static
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# else not NDEBUG
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# define STATIC extern
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# endif not NDEBUG
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