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syntax.y
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syntax.y
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%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hashtbl.h"
#include "ast.h"
#include "ast_printer.h"
#define YYDEBUG 1
extern FILE * yyin;
extern int yylex();
extern void yyerror(const char *err);
//SymbolTableEntry* make_entry(DataType type, int isArray);
void addToSymbolTable(Node* list, DataType type, Node* fields);
void addFieldsToSymbolTable(struct hashnode_s** curr_field, Node* fields);
void free_fields(Node* fields);
AST_Node* ast;
HASHTBL *hashtbl;
int scope = 0;
Node *test;
%}
%define parse.error verbose
%union{
Value val;
int intval;
float floatval;
char charval;
char* strval;
DataType basictype;
UndefVar undef_var;
struct hashnode_s* symbol;
struct Node *list;
AST_Node* node;
}
// KEYWORDS
%start program
%token FUNCTION "FUNCTION"
%token SUBROUTINE "SUBROUTINE"
%token END "END"
%token INTEGER "INTEGER"
%token REAL "REAL"
%token LOGICAL "LOGICAL"
%token CHARACTER "CHARACTER"
%token RECORD "RECORD"
%token ENDREC "ENDREC"
%token DATA "DATA"
%token CONTINUE "CONTINUE"
%token GOTO "GOTO"
%token CALL "CALL"
%token READ "READ"
%token WRITE "WRITE"
%token IF "IF"
%token THEN "THEN"
%token ELSE "ELSE"
%token ENDIF "ENDIF"
%token DO "DO"
%token ENDDO "ENDDO"
%token STOP "STOP"
%token RETURN "RETURN"
//IDENTIFIER
%token <strval> ID "Identifier"
//Constants
%token <val> ICONST "ICONST"
%token <val> RCONST "RCONST"
%token <val> LCONST "LCONST"
%token <val> CCONST "CCONST"
//Operators
%token OROP ".OR."
%token ANDOP ".AND."
%token NOTOP ".NOT."
%token <intval> RELOP
%token <intval> ADDOP "+ or -"
%token MULOP "*"
%token DIVOP "/"
%token POWEROP "**"
//Strings
%token STRING "String"
//Other
%token LPAREN "("
%token RPAREN ")"
%token COMMA ","
%token ASSIGN "="
%token COLON ":"
%token T_EOF 0 "end of file"
%left OROP
%left ANDOP
%precedence NOTOP
%nonassoc RELOP
%left ADDOP
%left MULOP DIVOP
%right POWEROP
%left COLON LPAREN RPAREN
%type <basictype> type
%type <undef_var> undef_variable
%type <list> vars fields field
%type <node> declarations expression constant variable assignment simple_statement if_statement label statement
%type <node> labeled_statement goto_statement branch_statement tail body compound_statement statements
%%
program : body END subprograms {ast = $1;}
;
body : declarations statements {$$ = new_ast_body_node($1, $2);}
;
declarations : declarations type vars {$$ = new_ast_decl_list_node($1 ,new_ast_decl_node($2, $3)); addToSymbolTable($3, $2, NULL); /*freeList(&$3);*/}
| declarations RECORD fields ENDREC vars {displayList($3); displayList($5); addToSymbolTable($5, RECORD_TYPE, $3); freeList(&$3); freeList(&$5); printf("list record destroyed\n");}
| declarations DATA vals
| %empty {$$ = new_ast_decl_list_node(NULL, NULL);}
;
type : INTEGER {$$ = INT_TYPE;}
| REAL {$$ = REAL_TYPE;}
| LOGICAL {$$ = LOGICAL_TYPE;}
| CHARACTER {$$ = CHARACTER_TYPE;}
;
vars : vars COMMA undef_variable {insertAtEnd(&$$, $3);}
| undef_variable {$$ = createNode($1);}
;
undef_variable : ID LPAREN dims RPAREN {$$.name = $1; $$.isArray = 1;}
| ID {$$.name = $1; $$.isArray = 0;}
;
dims : dims COMMA dim
| dim
dim : ICONST
| ID //{hashtbl_insert(hashtbl, $1, NULL, scope, current_type);}
;
fields : fields field {concatLists(&$$, $2);}
| field {$$ = $1;}
;
field : type vars {updateType($2, $1); $$ = $2;}
| RECORD fields ENDREC vars {concatLists(&$4->fields, $2); updateType($4, RECORD_TYPE);$$ = $4;}
;
vals : vals COMMA ID value_list //{hashtbl_insert(hashtbl, $3, NULL, scope, current_type);}
| ID value_list //{hashtbl_insert(hashtbl, $1, NULL, scope, current_type);}
;
value_list : DIVOP values DIVOP
;
values : values COMMA value
| value
;
value : repeat MULOP ADDOP constant
| repeat MULOP constant
| repeat MULOP STRING
| ADDOP constant
| constant
| STRING
;
repeat : ICONST | %empty
;
constant : ICONST {$$ = new_ast_const_node(INT_TYPE, $1);}
| RCONST {$$ = new_ast_const_node(REAL_TYPE, $1);}
| LCONST {$$ = new_ast_const_node(INT_TYPE, $1);}
| CCONST {$$ = new_ast_const_node(CHARACTER_TYPE, $1);}
;
statements : statements labeled_statement {$$ = new_ast_stms_node($1, $2);}
| labeled_statement {$$ = new_ast_stms_node(NULL, $1);}
;
labeled_statement : label statement {$$ = new_ast_labeled_stm_node($1, $2);}
| statement {$$ = $1;}
;
label : ICONST {$$ = new_ast_label_node($1.ival);}
;
statement : simple_statement {$$ = $1;}
| compound_statement {$$ = $1;}
;
simple_statement : assignment {$$ = $1;}
| goto_statement {$$ = $1;}
| if_statement {$$ = $1;}
| subroutine_call {}
| io_statement {}
| CONTINUE {}
| RETURN {}
| STOP {}
;
assignment : variable ASSIGN expression {$$ = new_ast_assign_node($1, $3);}
| variable ASSIGN STRING {printf("string\n");}
;
variable : variable COLON ID {printf("struct\n");} //{hashtbl_insert(hashtbl, $3, NULL, scope, current_type);}
| variable LPAREN expressions RPAREN {printf("array\n");}
| ID {$$ = new_ast_ref_node(hashtbl_find(hashtbl, $1, scope));}
;
expressions : expressions COMMA expression
| expression
;
expression : expression OROP expression {$$ = new_ast_bool_node(OR, $1, $3);}
| expression ANDOP expression {$$ = new_ast_bool_node(AND, $1, $3);}
| expression RELOP expression {$$ = new_ast_rel_node($2, $1, $3);}
| expression ADDOP expression {$$ = new_ast_arithm_node($2, $1, $3); }
| expression MULOP expression {$$ = new_ast_arithm_node(MUL, $1, $3);}
| expression DIVOP expression {$$ = new_ast_arithm_node(DIV, $1, $3);}
| expression POWEROP expression {$$ = new_ast_arithm_node(POW, $1, $3);}
| NOTOP expression {$$ = new_ast_bool_node(NOT, $2, NULL);}
| ADDOP expression {$$ = new_ast_arithm_node($1, $2, NULL);}
| variable {$$ = $1;}
| constant {$$ = $1;}
| LPAREN expression RPAREN {$$ = $2;}
;
goto_statement : GOTO label {$$ = new_ast_goto_node($2);}
| GOTO ID COMMA LPAREN labels RPAREN {} //{hashtbl_insert(hashtbl, $2, NULL, scope, current_type);}
;
labels : labels COMMA label
| label
;
if_statement : IF LPAREN expression RPAREN label COMMA label COMMA label {$$ = new_ast_arithm_if_node($3, $5, $7, $9);}
| IF LPAREN expression RPAREN simple_statement {$$ = new_ast_if_node($3, $5);}
;
subroutine_call : CALL variable
;
io_statement : READ read_list
| WRITE write_list
;
read_list : read_list COMMA read_item
| read_item
;
read_item : variable
| LPAREN read_list COMMA ID ASSIGN iter_space RPAREN //{hashtbl_insert(hashtbl, $4, NULL, scope, current_type);}
;
iter_space : expression COMMA expression step
;
step : COMMA expression
| %empty
;
write_list : write_list COMMA write_item
| write_item
;
write_item : expression
| LPAREN write_list COMMA ID ASSIGN iter_space RPAREN //{hashtbl_insert(hashtbl, $4, NULL, scope, current_type);}
| STRING
;
compound_statement : branch_statement {$$ = $1;}
| loop_statement {}
;
branch_statement : IF LPAREN expression RPAREN THEN body tail {$$ = new_ast_branch_node($3, $6, $7);}
;
tail : ELSE body ENDIF {$$ = $2;}
| ENDIF {$$ = NULL;}
;
loop_statement : DO ID ASSIGN iter_space body ENDDO //{hashtbl_insert(hashtbl, $2, NULL, scope, current_type);}
;
subprograms : subprograms subprogram
| %empty
;
subprogram : header body END
;
header : type FUNCTION ID LPAREN formal_parameters RPAREN //{hashtbl_insert(hashtbl, $3, NULL, scope, current_type);}
| SUBROUTINE ID LPAREN formal_parameters RPAREN //{hashtbl_insert(hashtbl, $2, NULL, scope, current_type);}
| SUBROUTINE ID //{hashtbl_insert(hashtbl, $2, NULL, scope, current_type);}
;
formal_parameters : type vars COMMA formal_parameters
| type vars
;
%%
int main(int argc, char *argv[]) {
int token;
if(argc < 2) {
printf("Please provide a filename as a command-line argument.\n");
return 1;
}
yyin = fopen(argv[1], "r");
if(yyin == NULL) {
printf("Error opening the file.\n");
return 1;
}
if(!(hashtbl = hashtbl_create(10, NULL))) {
puts("Error, failed to initialize hashtable\n");
return -1;
}
yyparse();
fclose(yyin);
ast_print_node(ast, 0);
//hashtbl_print(hashtbl);
hashtbl_destroy(hashtbl);
return 0;
}
void addToSymbolTable(Node* list, DataType type, Node* fields) {
Node* curr = list;
struct hashnode_s* node;
while (curr != NULL) {
node = hashtbl_insert(hashtbl, strdup(curr->data.name), NULL, scope, type, curr->data.isArray);
if (fields) {
printf("Adding fields\n");
addFieldsToSymbolTable(&(node->fields), fields);
}
curr = curr->next; // Move to the next node in the list
}
Node* temp = fields;
while(temp){
free(temp->data.name);
free_fields(temp->fields);
temp = temp->next;
}
}
void free_fields(Node* fields){
Node* current = fields;
Node* next;
while (current != NULL) {
next = current->next;
free(current->data.name);
current = next;
}
}
void addFieldsToSymbolTable(struct hashnode_s** curr_field, Node* fields) {
Node* temp_fields = fields;
while (temp_fields) {
UndefVar field = temp_fields->data;
struct hashnode_s* new_field = malloc(sizeof(struct hashnode_s));
new_field->key = strdup(field.name);
new_field->isArray = field.isArray;
new_field->type = field.type;
new_field->next = NULL;
new_field->fields = NULL;
*curr_field = new_field;
curr_field = &(new_field->next);
if (temp_fields->fields) {
printf("Adding nested fields\n");
addFieldsToSymbolTable(&(new_field->fields), temp_fields->fields);
}
temp_fields = temp_fields->next; // Move to the next field
}
}