AStat/frontend/parser.mly

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2024-05-29 11:47:47 +02:00
(*
Cours "Sémantique et Application à la Vérification de programmes"
Antoine Miné 2015
Marc Chevalier 2018
Josselin Giet 2021
Ecole normale supérieure, Paris, France / CNRS / INRIA
*)
(*
Parser for a very simple C-like "curly bracket" language.
*)
%{
open Abstract_syntax_tree
%}
/* tokens */
/**********/
%token TOK_VOID
%token TOK_INT
%token TOK_TRUE
%token TOK_FALSE
%token TOK_RAND
%token TOK_BRAND
%token TOK_FOR
%token TOK_WHILE
%token TOK_RETURN
%token TOK_BREAK
%token TOK_IF
%token TOK_ELSE
%token TOK_GOTO
%token TOK_ASSERT
%token TOK_LPAREN
%token TOK_RPAREN
%token TOK_LCURLY
%token TOK_RCURLY
%token TOK_STAR
%token TOK_PLUS
%token TOK_MINUS
%token TOK_EXCLAIM
%token TOK_DIVIDE
%token TOK_PERCENT
%token TOK_LESS
%token TOK_GREATER
%token TOK_LESS_EQUAL
%token TOK_GREATER_EQUAL
%token TOK_EQUAL_EQUAL
%token TOK_NOT_EQUAL
%token TOK_AND_AND
%token TOK_BAR_BAR
%token TOK_SEMICOLON
%token TOK_COLON
%token TOK_COMMA
%token TOK_EQUAL
%token TOK_PLUS_PLUS
%token TOK_MINUS_MINUS
%token TOK_PLUS_EQUAL
%token TOK_MINUS_EQUAL
%token TOK_STAR_EQUAL
%token TOK_DIVIDE_EQUAL
%token TOK_PERCENT_EQUAL
%token <string> TOK_id
%token <string> TOK_int
%token TOK_EOF
/* priorities of binary operators (lowest to highest) */
%left TOK_BAR_BAR
%left TOK_AND_AND
%left TOK_EXCLAIM
%left TOK_PLUS TOK_MINUS
%left TOK_STAR TOK_DIVIDE TOK_PERCENT
/* entry-points */
/****************/
%start<Abstract_syntax_tree.toplevel list Abstract_syntax_tree.ext> file
%%
/* toplevel */
/************/
file: t=ext(list(toplevel)) TOK_EOF { t }
toplevel:
| d=ext(var_decl) { AST_global_decl d }
| d=ext(fun_decl) { AST_fun_decl d }
/* expressions */
/***************/
bool_expr:
| TOK_LPAREN e=bool_expr TOK_RPAREN
{ e }
| TOK_TRUE
{ AST_bool_const true }
| TOK_FALSE
{ AST_bool_const false }
| o=bool_unary_op e=ext(bool_expr)
{ AST_bool_unary (o,e) }
| e1=ext(bool_expr) o=bool_binary_op e2=ext(bool_expr)
{ AST_bool_binary (o,e1,e2) }
| e1=ext(int_expr) o=compare_op e2=ext(int_expr)
{ AST_compare (o,e1,e2) }
| TOK_BRAND
{ AST_bool_rand }
int_expr:
| TOK_LPAREN e=int_expr TOK_RPAREN
{ e }
| e=ext(TOK_int)
{ AST_int_const e }
| e=ext(TOK_id)
{ AST_int_identifier e }
| o=int_unary_op e=ext(int_expr)
{ AST_int_unary (o,e) }
| e1=ext(int_expr) o=int_binary_op e2=ext(int_expr)
{ AST_int_binary (o,e1,e2) }
| TOK_RAND TOK_LPAREN e1=ext(sign_int_literal)
TOK_COMMA e2=ext(sign_int_literal) TOK_RPAREN
{ AST_int_rand (e1, e2) }
| e=ext(TOK_id) TOK_LPAREN l=int_expr_list TOK_RPAREN
{ AST_expr_call (e, l) }
int_expr_list:
l=separated_list(TOK_COMMA,ext(int_expr)) { l }
/* integer with optional sign */
sign_int_literal:
| i=TOK_int { i }
| TOK_PLUS i=TOK_int { i }
| TOK_MINUS i=TOK_int { "-"^i }
%inline int_unary_op:
| TOK_PLUS { AST_UNARY_PLUS }
| TOK_MINUS { AST_UNARY_MINUS }
%inline bool_unary_op:
| TOK_EXCLAIM { AST_NOT }
%inline int_binary_op:
| TOK_STAR { AST_MULTIPLY }
| TOK_DIVIDE { AST_DIVIDE }
| TOK_PERCENT { AST_MODULO }
| TOK_PLUS { AST_PLUS }
| TOK_MINUS { AST_MINUS }
%inline assign_op:
| TOK_STAR_EQUAL { AST_MULTIPLY }
| TOK_DIVIDE_EQUAL { AST_DIVIDE }
| TOK_PERCENT_EQUAL { AST_MODULO }
| TOK_PLUS_EQUAL { AST_PLUS }
| TOK_MINUS_EQUAL { AST_MINUS }
%inline compare_op:
| TOK_LESS { AST_LESS }
| TOK_GREATER { AST_GREATER }
| TOK_LESS_EQUAL { AST_LESS_EQUAL }
| TOK_GREATER_EQUAL { AST_GREATER_EQUAL }
| TOK_EQUAL_EQUAL { AST_EQUAL }
| TOK_NOT_EQUAL { AST_NOT_EQUAL }
%inline bool_binary_op:
| TOK_AND_AND { AST_AND }
| TOK_BAR_BAR { AST_OR }
/* declarations */
/****************/
var_decl:
| s=ext(typ) i=separated_list(TOK_COMMA,init_declarator) TOK_SEMICOLON
{ s, i }
init_declarator:
| v=ext(TOK_id) { v, None }
| v=ext(TOK_id) TOK_EQUAL i=ext(int_expr) { v, Some i }
fun_decl:
| t=ext(typ_or_void) i=ext(TOK_id)
TOK_LPAREN p=separated_list(TOK_COMMA,param_decl) TOK_RPAREN
TOK_LCURLY l=list(ext(stat)) TOK_RCURLY
{ { Abstract_syntax_tree.fun_name = i;
Abstract_syntax_tree.fun_typ = t;
Abstract_syntax_tree.fun_args = p;
Abstract_syntax_tree.fun_body = l;
Abstract_syntax_tree.fun_ext = ($startpos, $endpos); }
}
param_decl:
| s=ext(typ) v=ext(TOK_id) { s, v }
typ:
| TOK_INT { AST_TYP_INT }
%inline typ_or_void:
| t=typ { Some t }
| TOK_VOID { None }
/* statements */
/**************/
assign:
| e=ext(TOK_id) TOK_EQUAL f=ext(int_expr)
{ AST_assign (e, f) }
| e=ext(TOK_id) o=assign_op f=ext(int_expr)
{ AST_assign_op (e, o, f) }
| e=ext(TOK_id) TOK_PLUS_PLUS
{ AST_increment (e,1) }
| e=ext(TOK_id) TOK_MINUS_MINUS
{ AST_increment (e,-1); }
assign_list:
l=separated_list(TOK_COMMA,ext(assign)) { l }
common_stat:
| a=assign TOK_SEMICOLON { a }
| d=ext(var_decl) { AST_local_decl d }
| TOK_LCURLY l=list(ext(stat)) TOK_RCURLY { AST_block l }
| e=ext(TOK_id) TOK_COLON { AST_label e }
| TOK_ASSERT TOK_LPAREN e=ext(bool_expr) TOK_RPAREN TOK_SEMICOLON { AST_assert e }
| e=ext(TOK_BREAK) TOK_SEMICOLON { AST_break e }
| e=ext(TOK_id) TOK_LPAREN l=int_expr_list TOK_RPAREN TOK_SEMICOLON { AST_stat_call (e, l) }
| TOK_RETURN e=option(ext(int_expr)) TOK_SEMICOLON { AST_return e }
| TOK_SEMICOLON { AST_SKIP }
| TOK_GOTO e=ext(TOK_id) TOK_SEMICOLON { AST_goto e }
stat_with_else:
| s=common_stat { s }
| TOK_IF TOK_LPAREN e=ext(bool_expr) TOK_RPAREN s=ext(stat_with_else) TOK_ELSE t=ext(stat_with_else) { AST_if (e, s, Some t) }
| TOK_WHILE TOK_LPAREN e=ext(bool_expr) TOK_RPAREN s=ext(stat_with_else) { AST_while (e, s) }
| TOK_FOR TOK_LPAREN a=assign_list TOK_SEMICOLON b=option(ext(bool_expr)) TOK_SEMICOLON c=assign_list TOK_RPAREN s=ext(stat_with_else) { AST_for (a,b,c,s) }
stat:
| s=common_stat { s }
| TOK_IF TOK_LPAREN e=ext(bool_expr) TOK_RPAREN s=ext(stat) { AST_if (e, s, None) }
| TOK_IF TOK_LPAREN e=ext(bool_expr) TOK_RPAREN s=ext(stat_with_else) TOK_ELSE t=ext(stat) { AST_if (e, s, Some t) }
| TOK_WHILE TOK_LPAREN e=ext(bool_expr) TOK_RPAREN s=ext(stat) { AST_while (e, s) }
| TOK_FOR TOK_LPAREN a=assign_list TOK_SEMICOLON b=option(ext(bool_expr)) TOK_SEMICOLON c=assign_list TOK_RPAREN s=ext(stat) { AST_for (a,b,c,s) }
/* utilities */
/*************/
/* adds extent information to rule */
%inline ext(X):
| x=X { x, ($startpos, $endpos) }
%%