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