ast.h

   1 #ifndef AST_H
   2 #define AST_H
   3
   4 #include <stdio.h>
   5 #include <stdbool.h>
   6
   7 #include "util.h"
   8 struct ast;
   9 #include "parse.h"
  10
  11 extern const char *fieldspec_str[];
  12 extern const char *binop_str[];
  13 extern const char *unop_str[];
  14 struct ast {
  15         int ndecls;
  16         struct decl **decls;
  17 };
  18
  19 struct vardecl {
  20         struct type *type;
  21         char *ident;
  22         struct expr *expr;
  23 };
  24
  25 enum basictype {btbool, btchar, btint, btvoid};
  26 struct type {
  27         enum {tbasic,tlist,ttuple,tvar} type;
  28         union {
  29                 enum basictype tbasic;
  30                 struct type *tlist;
  31                 struct {
  32                         struct type *l;
  33                         struct type *r;
  34                 } ttuple;
  35                 char *tvar;
  36         } data;
  37 };
  38
  39 struct decl {
  40         enum {dfundecl, dvardecl} type;
  41         union {
  42                 struct {
  43                         char *ident;
  44                         int nargs;
  45                         char **args;
  46                         int natypes;
  47                         struct type **atypes;
  48                         struct type *rtype;
  49                         int nbody;
  50                         struct stmt **body;
  51                 } dfun;
  52                 struct vardecl *dvar;
  53         } data;
  54 };
  55
  56 struct stmt {
  57         enum {sassign, sif, sreturn, sexpr, svardecl, swhile} type;
  58         union {
  59                 struct {
  60                         char *ident;
  61                         int nfields;
  62                         char **fields;
  63                         struct expr *expr;
  64                 } sassign;
  65                 struct {
  66                         struct expr *pred;
  67                         int nthen;
  68                         struct stmt **then;
  69                         int nels;
  70                         struct stmt **els;
  71                 } sif;
  72                 struct vardecl *svardecl;
  73                 struct expr *sreturn;
  74                 struct expr *sexpr;
  75                 struct {
  76                         struct expr *pred;
  77                         int nbody;
  78                         struct stmt **body;
  79                 } swhile;
  80         } data;
  81 };
  82
  83 enum binop {
  84         binor, binand, eq, neq, leq, le, geq, ge, cons, plus, minus, times,
  85         divide, modulo, power,
  86 };
  87 enum fieldspec {fst,snd,hd,tl};
  88 enum unop {negate,inverse};
  89 struct expr {
  90         enum {ebinop, ebool, echar, efuncall, eident, eint, enil, etuple,
  91                 estring, eunop} type;
  92         union {
  93                 bool ebool;
  94                 struct {
  95                         struct expr *l;
  96                         enum binop op;
  97                         struct expr *r;
  98                 } ebinop;
  99                 char echar;
 100                 struct {
 101                         char *ident;
 102                         int nargs;
 103                         struct expr **args;
 104                         int nfields;
 105                         enum fieldspec *fields;
 106                 } efuncall;
 107                 int eint;
 108                 struct {
 109                         char *ident;
 110                         int nfields;
 111                         enum fieldspec *fields;
 112                 } eident;
 113                 struct {
 114                         struct expr *left;
 115                         struct expr *right;
 116                 } etuple;
 117                 struct {
 118                         int nchars;
 119                         char *chars;
 120                 } estring;
 121                 struct {
 122                         enum unop op;
 123                         struct expr *l;
 124                 } eunop;
 125         } data;
 126 };
 127
 128 struct ast *ast(struct list *decls);
 129
 130 struct vardecl *vardecl(struct type *type, char *ident, struct expr *expr);
 131
 132 struct decl *decl_fun(char *ident, struct list *args, struct list *atypes,
 133         struct type *rtype, struct list *body);
 134 struct decl *decl_var(struct vardecl *vardecl);
 135
 136 struct stmt *stmt_assign(char *ident, struct list *fields, struct expr *expr);
 137 struct stmt *stmt_if(struct expr *pred, struct list *then, struct list *els);
 138 struct stmt *stmt_return(struct expr *rtrn);
 139 struct stmt *stmt_expr(struct expr *expr);
 140 struct stmt *stmt_vardecl(struct vardecl *vardecl);
 141 struct stmt *stmt_while(struct expr *pred, struct list *body);
 142
 143 struct expr *expr_binop(struct expr *l, enum binop op, struct expr *r);
 144 struct expr *expr_bool(bool b);
 145 struct expr *expr_char(char *c);
 146 struct expr *expr_funcall(char *ident, struct list *args, struct list *fields);
 147 struct expr *expr_int(int integer);
 148 struct expr *expr_ident(char *ident, struct list *fields);
 149 struct expr *expr_nil();
 150 struct expr *expr_tuple(struct expr *left, struct expr *right);
 151 struct expr *expr_string(char *str);
 152 struct expr *expr_unop(enum unop op, struct expr *l);
 153
 154 struct type *type_basic(enum basictype type);
 155 struct type *type_list(struct type *type);
 156 struct type *type_tuple(struct type *l, struct type *r);
 157 struct type *type_var(char *ident);
 158
 159 void ast_print(struct ast *, FILE *out);
 160 void vardecl_print(struct vardecl *decl, int indent, FILE *out);
 161 void decl_print(struct decl *ast, int indent, FILE *out);
 162 void stmt_print(struct stmt *ast, int indent, FILE *out);
 163 void expr_print(struct expr *ast, FILE *out);
 164 void type_print(struct type *type, FILE *out);
 165
 166 void ast_free(struct ast *);
 167 void vardecl_free(struct vardecl *decl);
 168 void decl_free(struct decl *ast);
 169 void stmt_free(struct stmt *ast);
 170 void expr_free(struct expr *ast);
 171 void type_free(struct type *type);
 172
 173 #endif