161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
#ifndef BURG_INCLUDED
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#define BURG_INCLUDED
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#include "em_arith.h"
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#include "stringlist.h"
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#include "array.h"
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extern char* stringf(char* fmt, ...);
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typedef enum
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{
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TERM = 1,
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NONTERM,
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REG,
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REGCLASS
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} Kind;
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typedef struct rule* Rule;
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typedef struct term* Term;
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enum
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{
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CONSTRAINT_EQUALS,
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CONSTRAINT_CORRUPTED_ATTR,
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CONSTRAINT_PRESERVED,
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};
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struct constraint
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{
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int type;
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const char* left;
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const char* right;
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struct constraint* next;
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};
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enum
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{
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PREDICATE_FUNCTION,
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PREDICATE_NODE,
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PREDICATE_NUMBER
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};
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struct expr
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{
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int type;
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struct expr* next;
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union
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{
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const char* name;
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arith number;
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} u;
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};
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struct terminfo
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{
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const char* name;
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const char* label;
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const char* attr;
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};
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struct reg
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{
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const char* name; /* friendly register name */
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int number; /* identifying number */
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uint32_t attrs; /* bitfield of register attributes */
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struct stringlist* names; /* register names */
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ARRAYOF(struct reg) aliases; /* registers that this one aliases */
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};
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struct regattr
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{
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const char* name; /* class name */
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int number; /* identifying number */
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};
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extern struct reg* makereg(const char* name);
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extern void setregnames(struct reg* reg, struct stringlist* names);
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extern void addregattr(struct reg* reg, const char* regattr);
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extern void addregaliases(struct reg* reg, struct stringlist* aliases);
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extern struct regattr* getregattr(const char* name);
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struct term
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{ /* terminals: */
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char* name; /* terminal name */
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Kind kind; /* TERM */
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int esn; /* external symbol number */
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int arity; /* operator arity */
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Term link; /* next terminal in esn order */
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Rule rules; /* rules whose pattern starts with term */
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};
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typedef struct nonterm* Nonterm;
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struct nonterm
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{ /* non-terminals: */
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char* name; /* non-terminal name */
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Kind kind; /* NONTERM */
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int number; /* identifying number */
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int lhscount; /* # times nt appears in a rule lhs */
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int reached; /* 1 iff reached from start non-terminal */
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Rule rules; /* rules w/non-terminal on lhs */
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Rule chain; /* chain rules w/non-terminal on rhs */
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Nonterm link; /* next terminal in number order */
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bool is_fragment; /* these instructions are all fragments */
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};
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extern void* lookup(const char* name);
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extern Nonterm nonterm(const char* id, bool allocate);
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extern Term term(const char* id, int esn);
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typedef struct tree* Tree;
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struct tree
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{ /* tree patterns: */
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void* op; /* a terminal or non-terminal */
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const char* label; /* user label for this node */
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Tree left, right; /* operands */
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int nterms; /* number of terminal nodes in this tree */
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struct regattr* attr; /* input register attribute */
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};
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extern Tree tree(const struct terminfo* ti, Tree left, Tree right);
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struct rule
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{ /* rules: */
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Nonterm lhs; /* lefthand side non-terminal */
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Tree pattern; /* rule pattern */
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int lineno; /* line number where allocated */
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int ern; /* external rule number */
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int packed; /* packed external rule number */
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int cost; /* associated cost */
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const char* label; /* label for LHS */
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struct regattr* attr; /* register attribute of result */
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Rule link; /* next rule in ern order */
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Rule next; /* next rule with same pattern root */
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Rule chain; /* next chain rule with same rhs */
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Rule decode; /* next rule with same lhs */
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Rule kids; /* next rule with same burm_kids pattern */
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ARRAYOF(struct expr) prefers; /* C predicates */
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ARRAYOF(struct expr) requires; /* C predicates */
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ARRAYOF(struct constraint) constraints; /* register constraints */
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struct stringlist code; /* compiler output code strings */
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};
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extern Rule rule(const struct terminfo* ti, Tree pattern);
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extern int maxcost; /* maximum cost */
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/* gram.y: */
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void yyerror(char* fmt, ...);
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int yyparse(void);
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void yywarn(char* fmt, ...);
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extern int errcnt;
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extern FILE* infp;
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extern FILE* outfp;
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extern FILE* hdrfp;
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/* Stupid flex imports --- why mo header file? */
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extern FILE* yyin;
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extern int yylineno;
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extern void printlineno(void);
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#include "mcgg.h"
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#endif
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