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parser.c
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/**
* School project to subject IFJ (Formal Languages and Compilers)
* Compiler implementation of imperative language IFJ18
*
* Module for recursive descent parser
*
* Author: Jan Zauska Julius Marko Jan Vavro
* Login: xzausk00 xmarko17 xvavro05
*/
#include "lex.h"
#include "error.h"
#include "parser.h"
#include "semantic.h"
#include "expr_parser.h"
#include "code_gen.h"
int token;
//temp
string *value;
string *temp;
int err;
extern int prev_token;
int assign(char *fun_id) {
// pravidlo <assign> -> "ID" = <value>
char previous_token_value[value->length + 1];
strcpy(previous_token_value, value->str);
strCopyString(temp, value);
switch (token) {
case ROUNDL:
if ((err = math_expr(fun_id)) != SYNTAX_OK) return err;
GEN_INSTR("MOVE %s %s", "LF@$retval", "GF@expr_res");
ACCEPT(LEX_EOL);
return SYNTAX_OK;
case IDF:
case ID:
strcpy(previous_token_value, value->str);
GET_TOKEN();
if (is_function(previous_token_value)) {
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
return SYNTAX_OK;
}
if (IS_VALID_PARAM || token == ROUNDL) {
insert_fun_to_st(previous_token_value, 0, false, false);
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
return SYNTAX_OK;
} else if (token == LEX_EOL) {
if (semantic_check_var_defined(fun_id, previous_token_value) == ERR_SEMANTIC_DEFINITION) {
insert_fun_to_st(previous_token_value, 0, false, false);
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
return SYNTAX_OK;
}
} else {
prev_token = token;
token = ID;
strcpy(value->str, previous_token_value);
if ((err = math_expr(fun_id)) != SYNTAX_OK) return err;
else GEN_INSTR("MOVE %s %s", "LF@$retval", "GF@expr_res");
}
ACCEPT(LEX_EOL);
return SYNTAX_OK;
case PRINT:
case INPUTF:
case INPUTI:
case INPUTS:
case SUBSTR:
case LENGTH:
case CHR:
case ORD:
GET_TOKEN();
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
// GEN_INSTR("MOVE %s %s ", "GF@expr_res", "TF@$retval");
return SYNTAX_OK;
case NUM_INT:
case NUM_FLOAT:
case NUM_EXP:
case STRING:
case KEYWORD_NIL:
if ((err = math_expr(fun_id)) != SYNTAX_OK) return err;
GEN_INSTR("MOVE %s %s", "LF@$retval", "GF@expr_res");
ACCEPT(LEX_EOL);
return SYNTAX_OK;
case ERR_LEXICAL:
return ERR_LEXICAL;
default:
return ERR_SYNTAX;
}
}
int fun_params(char *fun_id) {
static size_t params_count = 0;
// <FUN_PARAMS> -> (<ITEM><ITEM_LIST)
switch (token) {
case ROUNDR:
GET_TOKEN();
ACCEPT(LEX_EOL);
params_count = 0;
return SYNTAX_OK;
case ID:
err = semantic_add_fun_param(fun_id, value->str);
if (err != 0) return err;
params_count++;
GEN_INSTR("DEFVAR LF@%s", value->str);
GEN_INSTR("MOVE LF@%s LF@%%%d", value->str, params_count);
GET_TOKEN();
if (token == ROUNDR) {
return fun_params(fun_id);
}
if (token == COMMA) {
GET_TOKEN();
if (token == ID)
return fun_params(fun_id);
return ERR_SYNTAX;
}
return ERR_SYNTAX;
case ERR_LEXICAL:
return ERR_LEXICAL;
default:
return ERR_SYNTAX;
}
}
int fun_declr() {
// <FUN_DECLR> -> DEF <ID> <FUN_PARAMS> EOL <STAT_LIST> END
char previous_token_value[value->length + 1];
strcpy(previous_token_value, value->str);
strCopyString(temp, value);
if (token != ID && token != IDF)
return ERR_SYNTAX;
GET_TOKEN();
if (semantic_check_fun_defined(previous_token_value) == ERR_SEMANTIC_DEFINITION) return ERR_SEMANTIC_DEFINITION;
if (gen_fun_header(previous_token_value) == ERR_INTERNAL) return ERR_INTERNAL;
ACCEPT(ROUNDL);
if ((err = fun_params(previous_token_value)) != SYNTAX_OK) return err;
if ((err = stat_list(previous_token_value)) != SYNTAX_OK) return err;
ACCEPT(KEYWORD_END);
ACCEPT(LEX_EOL);
if (gen_fun_footer(previous_token_value) == ERR_INTERNAL) return ERR_INTERNAL;
return SYNTAX_OK;
}
int params(char *fun_id, char *called_from_fun, unsigned *par_count) {
// pravidlo <CALL_PARAMS> -> <ITEM><ITEM_LIST
char previous_token_value[value->length + 1];
static size_t params_count = 0;
switch (token) {
case LEX_EOL:
case ROUNDR:
err = semantic_check_fun_call_params(fun_id, params_count);
*par_count = (unsigned) params_count;
params_count = 0;
if (err != 0) return err;
return SYNTAX_OK;
case INPUTS:
case INPUTI:
case INPUTF:
case LENGTH:
case SUBSTR:
case ORD:
case CHR:
case ID:
strcpy(previous_token_value, value->str);
if (is_function(previous_token_value)) return ERR_SEMANTIC_OTHER;
if (semantic_check_var_defined(called_from_fun, previous_token_value) == ERR_SEMANTIC_DEFINITION)
return ERR_SEMANTIC_DEFINITION;
case NUM_INT:
case NUM_FLOAT:
case NUM_EXP:
case STRING:
case KEYWORD_NIL:
params_count++;
GEN_INSTR("DEFVAR TF@%%%d", params_count);
if (token == NUM_INT) {
GEN_INSTR("MOVE TF@%%%d int@%s", params_count, value->str);
} else if (token == NUM_FLOAT || token == NUM_EXP) {
char *endptr;
double tmp = strtod(value->str, &endptr);
GEN_INSTR("MOVE TF@%%%d float@%a", params_count, tmp);
} else if (token == STRING) {
GEN_INSTR("MOVE TF@%%%d string@%s", params_count, value->str);
} else if (token == ID) {
GEN_INSTR("MOVE TF@%%%d LF@%s", params_count, value->str);
} else if (token == KEYWORD_NIL) {
GEN_INSTR("MOVE TF@%%%d nil@nil", params_count);
}
// check if param is defined
GET_TOKEN();
if (token == COMMA) {
GET_TOKEN();
if (token != ID && token != NUM_INT && token != NUM_FLOAT && token != NUM_EXP && token != STRING)
return ERR_SYNTAX;
return params(fun_id, called_from_fun, par_count);
}
if (token != LEX_EOL && token != ROUNDR) return ERR_SYNTAX;
return params(fun_id, called_from_fun, par_count);
case ERR_LEXICAL:
return ERR_LEXICAL;
default:
return ERR_SYNTAX;
}
}
int fun_call(char *fun_id, char *called_from_fun) {
// pravidlo <FUN_CALL> ->
if (!is_function(fun_id))
return ERR_SEMANTIC_DEFINITION;
if (!is_fun_defined(fun_id) && !is_fun_builtin(fun_id) && is_main_scope(called_from_fun))
return ERR_SEMANTIC_DEFINITION;
int brackets = 0;
if (token == ROUNDL) {
brackets = 1;
GET_TOKEN();
}
GEN_INSTR("%s", "CREATEFRAME");
unsigned par_count;
int err = params(fun_id, called_from_fun, &par_count);
if (err != SYNTAX_OK) return err;
if (brackets) {
ACCEPT(ROUNDR);
}
ACCEPT(LEX_EOL);
if (is_fun_builtin(fun_id)) {
if (gen_builtin_fun(fun_id, par_count) == ERR_INTERNAL) return ERR_INTERNAL;
}
if (!is_print_fun(fun_id)) GEN_INSTR("CALL *%s", fun_id); // print is handled inside gen_print()
GEN_INSTR("MOVE %s %s ", "LF@$retval", "TF@$retval");
GEN_INSTR("MOVE %s %s ", "GF@expr_res", "TF@$retval");
return SYNTAX_OK;
}
int stat_list(char *fun_id) {
bool is_id = false;
static int cnt = 0;
int label_id = 0;
char previous_token_value[value->length + 1];
strcpy(previous_token_value, value->str);
switch (token) {
case KEYWORD_IF:
cnt++;
label_id = cnt;
// pravidlo IF <EXPR> EOL <STAT_LIST> ELSE EOL <STAT_LIST> END
GET_TOKEN();
if ((err = bool_expr(fun_id)) != SYNTAX_OK) return err;
GEN_INSTR("JUMPIFNEQ ELSE_LABEL_%d %s %s", cnt, "GF@expr_res", "bool@true");
ACCEPT(KEYWORD_THEN);
ACCEPT(LEX_EOL);
if ((err = stat_list(fun_id)) != SYNTAX_OK) return err;
GEN_INSTR("JUMP ELSE_END_%d", label_id);
ACCEPT(KEYWORD_ELSE);
GEN_INSTR("LABEL ELSE_LABEL_%d", label_id);
ACCEPT(LEX_EOL);
if ((err = stat_list(fun_id)) != SYNTAX_OK) return err;
ACCEPT(KEYWORD_END);
ACCEPT(LEX_EOL);
GEN_INSTR("LABEL ELSE_END_%d", label_id);
return stat_list(fun_id);
case KEYWORD_WHILE:
cnt++;
label_id = cnt;
GEN_INSTR("LABEL WHILE_START_%d", label_id);
// pravidlo WHILE <EXPR> DO EOL <STAT_LIST> END
GET_TOKEN();
if ((err = bool_expr(fun_id)) != SYNTAX_OK) return err;
GEN_INSTR("JUMPIFNEQ WHILE_END_%d %s %s", cnt, "GF@expr_res", "bool@true");
ACCEPT(KEYWORD_DO);
ACCEPT(LEX_EOL);
if ((err = stat_list(fun_id)) != SYNTAX_OK) return err;
ACCEPT(KEYWORD_END);
ACCEPT(LEX_EOL);
GEN_INSTR("JUMP WHILE_START_%d", label_id);
GEN_INSTR("LABEL WHILE_END_%d", label_id);
return stat_list(fun_id);
case LEX_EOL:
GET_TOKEN();
return stat_list(fun_id);
case KEYWORD_NIL:
GET_TOKEN();
ACCEPT(LEX_EOL);
return stat_list(fun_id);
case KEYWORD_DEF:
case KEYWORD_END:
case KEYWORD_ELSE:
return SYNTAX_OK;
case LEX_EOF:
return SYNTAX_OK;
case ID:
strcpy(previous_token_value, value->str);
GET_TOKEN();
if (token == ASSIGN) {
GET_TOKEN();
if (!is_variable(previous_token_value, fun_id)) {
if (find_instr("LABEL *%s\n", fun_id) == ERR_INTERNAL) return ERR_INTERNAL;
if (insert_instr_after("MOVE TF@%s nil@nil\n", previous_token_value) == ERR_INTERNAL)
return ERR_INTERNAL;
if (insert_instr_after("DEFVAR TF@%s\n", previous_token_value) == ERR_INTERNAL) return ERR_INTERNAL;
}
if ((err = insert_var_to_st(previous_token_value, fun_id, true)) != 0) return err;
if ((err = assign(fun_id)) != SYNTAX_OK) return err;
GEN_INSTR("MOVE LF@%s GF@%s ", previous_token_value, "expr_res");
return stat_list(fun_id);
}
is_id = true;
case IDF:
if (!is_id) {
strcpy(previous_token_value, value->str);
GET_TOKEN();
is_id = false;
}
if (is_function(previous_token_value)) {
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
return stat_list(fun_id);
}
/* insert ID as function not defined yet */
if (IS_VALID_PARAM || token == ROUNDL) {
insert_fun_to_st(previous_token_value, 0, false, false);
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
return stat_list(fun_id);
} else if (token == LEX_EOL) { /* insert ID as function not defined yet */
if (semantic_check_var_defined(fun_id, previous_token_value) == ERR_SEMANTIC_DEFINITION) {
insert_fun_to_st(previous_token_value, 0, false, false);
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
return stat_list(fun_id);
}
} else {
prev_token = token;
token = ID;
strcpy(value->str, previous_token_value);
if ((err = math_expr(fun_id)) != SYNTAX_OK) return err;
else GEN_INSTR("MOVE %s %s", "LF@$retval", "GF@expr_res");
}
ACCEPT(LEX_EOL);
return stat_list(fun_id);
case NUM_EXP:
case NUM_FLOAT:
case STRING:
case NUM_INT:
case ROUNDL:
if ((err = math_expr(fun_id)) != SYNTAX_OK) return err;
GEN_INSTR("MOVE %s %s", "LF@$retval", "GF@expr_res");
ACCEPT(LEX_EOL);
return stat_list(fun_id);
case INPUTS:
case INPUTF:
case INPUTI:
case PRINT:
case LENGTH:
case ORD:
case CHR:
case SUBSTR:
strcpy(previous_token_value, value->str);
GET_TOKEN();
if ((err = fun_call(previous_token_value, fun_id)) != SYNTAX_OK) return err;
return stat_list(fun_id);
case ERR_LEXICAL:
return ERR_LEXICAL;
default:
return ERR_SYNTAX;
}
}
int program() {
switch (token) {
case KEYWORD_DEF:
GET_TOKEN();
if ((err = fun_declr()) != SYNTAX_OK) return err;
return program();
case LEX_EOF:
return SYNTAX_OK;
case ERR_LEXICAL:
return ERR_LEXICAL;
case KEYWORD_END:
case KEYWORD_ELSE:
GET_TOKEN();
return program();
default:
if ((err = stat_list("MAIN")) != SYNTAX_OK) return err;
return program();
}
}
int parse() {
int result;
value = malloc(sizeof(string));
temp = malloc(sizeof(string));
if (value == NULL || temp == NULL) return ERR_INTERNAL;
if (strInit(value) == STR_ERROR) return ERR_INTERNAL;
if (strInit(temp) == STR_ERROR) return ERR_INTERNAL;
if (semantic_prepare() == ERR_INTERNAL) return ERR_INTERNAL;
if (code_gen_prepare() == ERR_INTERNAL) return ERR_INTERNAL;
gen_header();
GET_TOKEN();
result = program();
if (err == SYNTAX_OK && !all_ids_defined()) return ERR_SEMANTIC_DEFINITION;
if (err == SYNTAX_OK) code_generate();
if (semantic_clean() == ERR_INTERNAL) return ERR_INTERNAL;
if (code_gen_clean() == ERR_INTERNAL) return ERR_INTERNAL;
strFree(value);
free(value);
strFree(temp);
free(temp);
return result;
}