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parser.y
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parser.y
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%{
// Wai Chun Leung
// wleung11
// Shineng Tang
// stang38
// $Id: parser.y,v 1.22 2019-04-23 14:07:52-07 - - $
// Dummy parser for scanner project.
#include <cassert>
#include "lyutils.h"
#include "astree.h"
%}
%debug
%defines
%error-verbose
%token-table
%verbose
%destructor { destroy ($$); } <>
%printer { astree::dump (yyoutput, $$); } <>
%initial-action {
parser::root = new astree (ROOT, {0, 0, 0}, "");
}
%token ROOT TOK_TYPE_ID TOK_FIELD
%token TOK_VOID TOK_INT TOK_STRING TOK_INDEX
%token TOK_IF TOK_ELSE TOK_WHILE TOK_RETURN TOK_STRUCT
%token TOK_NULLPTR TOK_ARRAY TOK_ARROW TOK_ALLOC TOK_PTR
%token TOK_EQ TOK_NE TOK_LT TOK_LE TOK_GT TOK_GE TOK_NOT
%token TOK_IDENT TOK_INTCON TOK_CHARCON TOK_STRINGCON
%token TOK_ROOT TOK_BLOCK TOK_CALL TOK_INITDECL
%token TOK_VARDECL TOK_RETURNVOID TOK_IFELSE TOK_PARAM
%token TOK_FUNCTION POS NEG TOK_PROTOTYPE
%right TOK_IF TOK_ELSE
%right '='
%left TOK_EQ TOK_NE TOK_GE TOK_LE '<' '>'
%left '+' '-'
%left '*' '/' '%'
%right POS NEG TOK_NOT
%left '[' TOK_ARROW TOK_CALL TOK_ALLOC
%nonassoc '('
%start start
%%
start : program { $$ = $1 = nullptr; }
program : program structdef { $$ = $1->adopt ($2);}
| program function { $$ = $1->adopt ($2);}
| program stmt { $$ = $1->adopt ($2); }
| program error '}' { destroy ($3); $$ = $1;}
| program error ';' { destroy ($3); $$ = $1;}
| { $$ = parser::root; }
structdef : args '}' ';' {
$$ = $1; destroy($2,$3); }
| TOK_STRUCT TOK_IDENT '{' '}' ';' {
$$ = $1->adopt($2); destroy($3,$4,$5); }
args : args identdecl ';' {
$$ = $1->adopt($2); destroy($3); }
| TOK_STRUCT TOK_IDENT '{' identdecl';' {
$$ = $1->adopt($2,$4); destroy($3,$5); }
identdecl : type TOK_IDENT {
$2->change_sym(TOK_TYPE_ID);
$$ = $1->adopt($2); }
stmt : vardecl { $$ = $1; }
| block { $$ = $1; }
| while { $$ = $1; }
| ifelse { $$ = $1; }
| return { $$ = $1; }
| ';' { $$ = $1; }
| expr ';' { $$ = $1; destroy($2); }
vardecl : type TOK_IDENT '=' expr ';' {
destroy($5);
$$ = $3->change_sym(TOK_VARDECL);
$$ = $3->adopt($1, $2, $4);}
return : TOK_RETURN expr ';' {destroy($3); $$ = $1->adopt($2);}
| TOK_RETURN ';' {
destroy($2);
$$ = $1->change_sym(TOK_RETURNVOID);}
while : TOK_WHILE '(' expr ')' stmt {destroy($2,$4);
$$ = $1->adopt($3,$5);}
ifelse : TOK_IF '(' expr ')'stmt TOK_ELSE stmt {
$$ = $1->adopt($3,$5,$7);$7->change_sym(TOK_IFELSE);
destroy($2,$4,$6); }
| TOK_IF '(' expr ')' stmt %prec TOK_ELSE {
$$ = $1->adopt($3,$5); destroy($2,$4); }
block : block_rec '}' {$$=$1; destroy($2); }
| '{''}' {
$$ = $1->adopt_sym(nullptr,TOK_BLOCK); destroy($2); }
block_rec : '{' stmt {$$ = $1->adopt_sym($2,TOK_BLOCK);}
| block_rec stmt { $$ = $1->adopt($2);}
expr : expr '=' expr { $$ = $2->adopt($1, $3); }
| expr '+' expr { $$ = $2->adopt($1, $3); }
| expr '-' expr { $$ = $2->adopt($1, $3); }
| expr '*' expr { $$ = $2->adopt($1, $3); }
| expr '/' expr { $$ = $2->adopt($1, $3); }
| expr '%' expr { $$ = $2->adopt($1, $3); }
| expr TOK_EQ expr { $$ = $2->adopt($1, $3); }
| expr TOK_NE expr { $$ = $2->adopt($1, $3); }
| expr TOK_GE expr { $$ = $2->adopt($1, $3); }
| expr TOK_LE expr { $$ = $2->adopt($1, $3); }
| TOK_NOT expr { $$ = $1->adopt($2); }
| expr '<' expr { $$ = $2->adopt($1, $3);}
| expr '>' expr { $$ = $2->adopt($1, $3);}
| '-' expr %prec NEG { $$ = $1->adopt($2); }
| '+' expr %prec POS { $$ = $1->adopt($2); }
| allocator { $$ = $1; }
| call { $$ = $1; }
| '(' expr ')' {destroy($1,$3);$$ = $2;}
| variable { $$ = $1; }
| constant { $$ = $1; }
exprs : exprs ',' expr { $$ = $1->adopt($3); destroy($2);}
| expr { $$ = $1;}
allocator : TOK_ALLOC '<' TOK_STRING '>' '(' expr ')' {
destroy ($2,$4,$5,$7); $$ = $1->adopt($3,$6); }
| TOK_ALLOC '<' TOK_STRUCT TOK_IDENT '>' '(' ')' {
destroy($2,$3,$5,$6,$7);
$4->change_sym(TOK_TYPE_ID);
$$ = $1->adopt($4); }
| TOK_ALLOC '<' TOK_ARRAY'<' plaintype'>''>''(' expr')' {
destroy($2,$4,$6);
destroy($7,$8,$10);
$$ = $1->adopt($3);
$5->change_sym(TOK_TYPE_ID);
$$ =$1->adopt($5,$9); }
plaintype : TOK_VOID { $$ = $1; }
| TOK_INT { $$ = $1; }
| TOK_STRING { $$ = $1; }
| TOK_PTR '<' TOK_STRUCT TOK_IDENT'>' {
destroy($2,$3,$5);
$4->change_sym(TOK_TYPE_ID);$$ = $1->adopt($4); }
type : plaintype { $$ = $1; }
| TOK_ARRAY '<' plaintype '>' {destroy($2, $4);
$3->change_sym(TOK_TYPE_ID);
$$ = $1->adopt($3);}
function : type TOK_IDENT params ')' block {
destroy($4);
astree* func = new astree(TOK_FUNCTION, $1->lloc,"");
astree* id = new astree(TOK_TYPE_ID, $1->lloc,"");
id->adopt($1,$2);
$$ = func->adopt(id,$3,$5); }
| type TOK_IDENT '(' ')' block {
destroy($4);
$3->change_sym(TOK_PARAM);
astree* func = new astree(TOK_FUNCTION, $1->lloc,"");
astree* id = new astree(TOK_TYPE_ID, $1->lloc,"");
id->adopt($1,$2);
$$ = func->adopt (id,$3,$5); }
| type TOK_IDENT params ')' ';' {
destroy($4,$5);
astree* func = new astree(TOK_FUNCTION, $1->lloc,"");
astree* id = new astree(TOK_TYPE_ID, $1->lloc,"");
id->adopt($1,$2);
$$ = func->adopt(id,$3); }
| type TOK_IDENT '(' ')' ';' {
destroy($4,$5);
$3->change_sym(TOK_PARAM);
astree* func = new astree(TOK_FUNCTION, $1->lloc,"");
astree* id = new astree(TOK_TYPE_ID, $1->lloc,"");
id->adopt($1,$2);
$$ = func->adopt (id,$3); }
params : '(' type TOK_IDENT {
astree* id = new astree(TOK_TYPE_ID, $2->lloc,"");
id->adopt($2,$3);
$$ = $1->adopt_sym(id,TOK_PARAM); }
| params ',' type TOK_IDENT {
destroy($2);
astree* id = new astree(TOK_TYPE_ID, $3->lloc,"");
id->adopt($3,$4);
$$ = $1->adopt(id); }
call : TOK_IDENT '(' exprs ')' {
destroy($4); $2->change_sym(TOK_CALL);
$$ = $2->adopt($1,$3); }
| TOK_IDENT '(' ')' {
destroy($3);
$2->change_sym(TOK_CALL);$$ = $2->adopt($1); }
variable : TOK_IDENT { $$ = $1; }
| expr '[' expr ']'{
destroy($4);
$2->change_sym(TOK_INDEX);
$$ = $2->adopt($1,$3); }
| expr TOK_ARROW TOK_IDENT {
$$ = $2->adopt($1,$3); }
constant : TOK_INTCON { $$ = $1; }
| TOK_CHARCON { $$ = $1; }
| TOK_STRINGCON { $$ = $1; }
| TOK_NULLPTR { $$ = $1; }
;
%%
const char *parser::get_tname (int symbol) {
return yytname [YYTRANSLATE (symbol)];
}
bool is_defined_token (int symbol) {
return YYTRANSLATE (symbol) > YYUNDEFTOK;
}