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[/] [eco32/] [trunk/] [lcc/] [lburg/] [lburg.h] - Rev 104
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#ifndef BURG_INCLUDED #define BURG_INCLUDED /* $Id: lburg.h,v 2.1 1994/11/30 21:53:18 drh Exp $ */ /* iburg.c: */ extern void *alloc(int nbytes); typedef enum { TERM=1, NONTERM } Kind; typedef struct rule *Rule; typedef struct term *Term; struct term { /* terminals: */ char *name; /* terminal name */ Kind kind; /* TERM */ int esn; /* external symbol number */ int arity; /* operator arity */ Term link; /* next terminal in esn order */ Rule rules; /* rules whose pattern starts with term */ }; typedef struct nonterm *Nonterm; struct nonterm { /* nonterminals: */ char *name; /* nonterminal name */ Kind kind; /* NONTERM */ int number; /* identifying number */ int lhscount; /* # times nt appears in a rule lhs */ int reached; /* 1 iff reached from start nonterminal */ Rule rules; /* rules w/nonterminal on lhs */ Rule chain; /* chain rules w/nonterminal on rhs */ Nonterm link; /* next terminal in number order */ }; extern Nonterm nonterm(char *id); extern Term term(char *id, int esn); typedef struct tree *Tree; struct tree { /* tree patterns: */ void *op; /* a terminal or nonterminal */ Tree left, right; /* operands */ int nterms; /* number of terminal nodes in this tree */ }; extern Tree tree(char *op, Tree left, Tree right); struct rule { /* rules: */ Nonterm lhs; /* lefthand side nonterminal */ Tree pattern; /* rule pattern */ int ern; /* external rule number */ int packed; /* packed external rule number */ int cost; /* cost, if a constant */ char *code; /* cost, if an expression */ char *template; /* assembler template */ Rule link; /* next rule in ern order */ Rule next; /* next rule with same pattern root */ Rule chain; /* next chain rule with same rhs */ Rule decode; /* next rule with same lhs */ Rule kids; /* next rule with same _kids pattern */ }; extern Rule rule(char *id, Tree pattern, char *template, char *code); /* gram.y: */ void yyerror(char *fmt, ...); int yyparse(void); void yywarn(char *fmt, ...); extern int errcnt; extern FILE *infp; extern FILE *outfp; #endif
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