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expression.c
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expression.c
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/*
* Project: Compiler for imperative programing language IFJ20
*
* File: expression.c
* Brief: Implementation of expression processing.
*
* Authors: Hladký Tomáš xhladk15@stud.fit.vutbr.cz
* Kostolányi Adam xkosto04@stud.fit.vutbr.cz
* Makiš Jozef xmakis00@stud.fit.vutbr.cz
* Bartko Jakub xbartk07@stud.fit.vutbr.cz
*/
#include "expression.h"
#include "parser.h"
#include "error.h"
#include "ll.h"
#include "codegen.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
// TODO
// a:= "test1"+"test2" unitialized
/* a:= "test1"
b:= "test2"
d:= "test3"
c:= a+(b+c) malloc */
// TODO INT2FLOAT neposlat do codegen ak to je uz float
// INT2FLOAT v relacnych
// INT2CHAR alias vstavana funkcia
// BOOL
// Precedence table actions
typedef enum
{
S, // Shift <
R, // Reduce >
A, // Accept
Eq, // Equal =
Err // Error
} PT_action;
// Precedence table tokens
typedef enum
{
OP_plus_minus, // + -
OP_mult_div, // * /
OP_parenth_open, // (
OP_parenth_close, // )
OP_rel_comp, // < <= > >= == != (RC)
OP_value, // i
OP_STRING, // string
OP_and, // &&
OP_or, // ||
OP_neg, // !
OP_dollar // $
} PT_operator;
// Precedence table
int precTable[11][11] = {
/* +- *,/ ( ) RC i STRING && || ! $ */
{R, S, S, R, R, S, S, Err, Err, Err, R}, // +-
{R, R, S, R, R, S, S, Err, Err, Err, R}, // */
{S, S, S, Eq, S, S, S, S, S, S, Err}, // (
{R, R, Err, R, R, Err, Err, R, R, R, R}, // )
{S, S, S, R, Err, S, S, R, R, S, R}, // RC
{R, R, Err, R, R, Err, Err, S, S, S, R}, // i
{R, Err, Err, Err, R, Err, Err, Err, Err, Err, R}, // STRING
{Err, Err, S, R, S, S, Err, R, R, S, R}, // &&
{Err, Err, S, R, S, S, Err, S, R, S, R}, // ||
{Err, Err, S, R, S, S, Err, R, R, S, R}, // !
{S, S, S, Err, S, S, S, S, S, S, A}, // $
};
#define T_DOLLAR 500 // STACK BOTTOM
#define T_EXPR 501 // EXPRESSION
tokenStack *symbolStack = NULL; // Symbol stack
tokenStack *tokStack = NULL; // Token stack
int exprNumber = 0;
symtable_value_t retExpr;
tPData *parsData = NULL;
bool eps;
bool ret;
bool was_func = false;
int get_index(tToken token)
{
switch (token.token_type)
{
case T_PLUS:
case T_MINUS:
return OP_plus_minus;
break;
case T_MUL:
case T_DIV:
return OP_mult_div;
break;
case T_L_BRACKET:
return OP_parenth_open;
break;
case T_R_BRACKET:
return OP_parenth_close;
break;
case T_LESS:
case T_LESS_EQ:
case T_GREATER:
case T_GREATER_EQ:
case T_EQ:
case T_NEQ:
return OP_rel_comp;
break;
case T_INT:
case T_FLOAT64:
case T_STRING:
case T_EXPR:
case T_IDENTIFIER:
case T_INT_VALUE:
case T_DEC_VALUE:
case T_TRUE:
case T_FALSE:
return OP_value;
break;
case T_STRING_VALUE:
return OP_STRING;
break;
case T_AND:
return OP_and;
break;
case T_OR:
return OP_or;
break;
case T_NEG:
return OP_neg;
break;
case T_DOLLAR:
case T_EOL:
case T_COMMA:
case T_LEFT_BRACE:
case T_SEMICOLON:
return OP_dollar;
break;
default:
release_resources();
error(2, "expression parser", "get_index", "Invalid input");
return 0;
break;
}
return 0;
}
void check_func()
{
// stash ID
char *id = to_string(parsData->token);
// check for func
symtable_value_t func = try_func(parsData->token);
if (func == NULL)
{ // recovery
// check if defined
eps = false;
id_find(scope_get_head(), id);
// stash following token
int ttype = parsData->token->token_type;
// add stashed ID
parsData->token->token_type = T_IDENTIFIER;
parsData->token->attr.str_lit.str = id;
stack_push(tokStack, *parsData->token);
check_symtable(tokStack->topToken);
// restore following token
parsData->token->token_type = ttype;
}
else
{ // adding func call as expression
// stash following token
int ttype = parsData->token->token_type;
// create key, name & token's name for dest variable
char *idExpr = create_id();
char *id_scope = id_add_scope(scope_get_head(), idExpr);
// create dest variable for func's return
sym_var_item_t *var_item = sym_var_item_init(id_scope);
sym_var_item_set_type(var_item, VAR_UNDEFINED);
symbol_t var_sym = {.sym_var_item = var_item};
elem_t *var = elem_init(SYM_VAR_ITEM, var_sym);
symtable_insert(symtable, id_scope, var);
instr_add_var_decl(var);
var_item->is_defined = true;
// add func call instruction
instr_type_t type = get_func_instr_type(func->symbol.sym_func->name);
instr_add_func_call(func, type);
// link func call to the rest of the expression
func_add_ret(func, var_item);
// add dest variable to stack
parsData->token->token_type = T_IDENTIFIER;
parsData->token->attr.str_lit.str = idExpr;
stack_push(tokStack, *parsData->token);
check_symtable(tokStack->topToken);
// restore following token
parsData->token->token_type = ttype;
}
}
void check_func_start()
{
if (parsData->token->token_type != T_IDENTIFIER)
{
was_func = false;
return;
}
char *id = to_string(parsData->token);
symtable_value_t func = try_func(parsData->token);
if (func != NULL)
{
int index = get_index(*parsData->token);
if (index == OP_dollar || index == OP_parenth_close)
{
retExpr = func; // a = foo()
was_func = true;
return;
}
else
{
int ttype = parsData->token->token_type;
char *idExpr = create_id();
char *id_scope = id_add_scope(scope_get_head(), idExpr);
// create variable and add to symtable
sym_var_item_t *var_item = sym_var_item_init(id_scope);
sym_var_item_set_type(var_item, VAR_UNDEFINED);
symbol_t var_sym = {.sym_var_item = var_item};
elem_t *var = elem_init(SYM_VAR_ITEM, var_sym);
symtable_insert(symtable, id_scope, var);
instr_add_var_decl(var);
var_item->is_defined = true;
instr_type_t type = get_func_instr_type(func->symbol.sym_func->name);
instr_add_func_call(func, type);
func_add_ret(func, var_item);
parsData->token->token_type = T_IDENTIFIER;
parsData->token->attr.str_lit.str = idExpr;
stack_push(tokStack, *parsData->token);
check_symtable(tokStack->topToken);
parsData->token->token_type = ttype;
}
}
else
{
eps = false;
id_find(scope_get_head(), id);
int ttype = parsData->token->token_type;
parsData->token->token_type = T_IDENTIFIER;
parsData->token->attr.str_lit.str = id;
stack_push(tokStack, *parsData->token);
check_symtable(tokStack->topToken);
parsData->token->token_type = ttype;
}
}
void check_symtable(stackElemPtr elem)
{
//printf("\nCHECK_SYMTABLE ORIGINAL TYPE\t%d\n", elem->originalType);
if (elem->originalType == T_IDENTIFIER)
{
// Variable already existing
eps = false;
elem->data = id_find(scope_get_head(), to_string(&(elem->token)));
char **str = &(parsData->token->attr.str_lit.str);
if (*str != NULL)
{
free(*str);
*str = NULL;
next.attr.str_lit.str = NULL;
}
}
else
{
// Variable non-existent -> create it
elem->data = create_variable(elem);
//printf("\nSymtable\t%s\n", elem->data->symbol.sym_var_item->data.string_t);
}
// If we just define... f.e. a:=5
retExpr = elem->data;
}
symtable_value_t create_dest(stackElemPtr elem)
{
char *id = create_id();
char *id_scope = id_add_scope(scope_get_head(), id);
free(id);
// create variable and add to symtable
sym_var_item_t *var_item = sym_var_item_init(id_scope);
if (get_index(symbolStack->topToken->token) == OP_rel_comp || get_index(symbolStack->topToken->token) == OP_and || get_index(symbolStack->topToken->token) == OP_or)
{
sym_var_item_set_type(var_item, VAR_BOOL);
}
else
{
sym_var_item_set_type(var_item, elem->data->symbol.sym_var_item->type);
check_types(
var_item,
tokStack->topToken->data->symbol.sym_var_item);
}
symbol_t var_sym = {.sym_var_item = var_item};
elem_t *var = elem_init(SYM_VAR_ITEM, var_sym);
symtable_insert(symtable, id_scope, var);
instr_add_var_decl(var);
var_item->is_defined = true;
return var;
}
symtable_value_t create_variable(stackElemPtr elem)
{
char *id = create_id();
char *id_scope = id_add_scope(scope_get_head(), id);
free(id);
// create variable and add to symtable
sym_var_item_t *var_item = sym_var_item_init(id_scope);
sym_var_item_set_type(var_item, var_type_check(elem));
sym_var_item_set_const(var_item, true);
variable_t variable;
switch (elem->token.token_type)
{
case T_INT_VALUE:
variable.int_t = to_int(&(elem->token));
break;
case T_DEC_VALUE:
variable.float64_t = to_double(&(elem->token));
break;
case T_STRING_VALUE:
if (elem->token.attr.str_lit.str == NULL)
{
variable.string_t = NULL;
}
else
{
variable.string_t = to_string(&(elem->token));
}
break;
case T_TRUE:
variable.bool_t = true;
break;
case T_FALSE:
variable.bool_t = false;
break;
default:
release_resources();
error(99, "expression parser", "create_variable", "Memory allocation failed");
break;
}
sym_var_item_set_data(var_item, variable);
symbol_t var_sym = {.sym_var_item = var_item};
elem_t *var = elem_init(SYM_VAR_ITEM, var_sym);
symtable_insert(symtable, id_scope, var);
return var;
}
char *create_id()
{
// id = 0Express = exprNumber + "expr" + \0
int length = snprintf(NULL, 0, "%d", exprNumber);
char *number = malloc(length + 1);
char *id = malloc(sizeof(char) * (length + 5));
if (id == NULL || number == NULL)
{
release_resources();
free(id);
free(number);
error(99, "expression parser", "create_variable", "Memory allocation failed");
}
sprintf(number, "%d", exprNumber); // INT TO STING
strcpy(id, number);
free(number);
strcat(id, "expr");
exprNumber++;
return id;
}
int var_type_check(stackElemPtr elem)
{
switch (elem->token.token_type)
{
case T_INT_VALUE:
return VAR_INT;
break;
case T_DEC_VALUE:
return VAR_FLOAT64;
break;
case T_STRING_VALUE:
return VAR_STRING;
break;
case T_TRUE:
case T_FALSE:
return VAR_BOOL;
break;
default:
//printf("\ntype\n");
release_resources();
error(99, "expression parser", "var_type_check", "Symtable variable creation failed");
break;
}
release_resources();
error(99, "expression parser", "var_type_check", "Symtable variable creation failed");
return 1;
}
void check_string(stackElemPtr top, stackElemPtr afterTop, tToken *symbol)
{
// ERROR if strings are operated with -,*,/ (string concatenation)
if (top->data->symbol.sym_var_item->type == VAR_STRING && afterTop->data->symbol.sym_var_item->type == VAR_STRING && (symbol->token_type == T_MINUS || symbol->token_type == T_MUL || symbol->token_type == T_DIV))
{
release_resources();
error(5, "expression parser", "check string", "Invalid string operation");
}
}
void check_num(stackElemPtr top, stackElemPtr afterTop)
{
if ((top->data->symbol.sym_var_item->type == VAR_INT && afterTop->data->symbol.sym_var_item->type == VAR_FLOAT64) || (top->data->symbol.sym_var_item->type == VAR_FLOAT64 && afterTop->data->symbol.sym_var_item->type == VAR_INT))
{
release_resources();
error(5, "expression parser", "check_num", "Variable types do not match");
}
}
void check_expr(tToken *token)
{
// If token stack is empty
if (token->token_type == T_DOLLAR)
{
release_resources();
error(2, "expression parser", "reduce", "Missing expression at operation");
}
}
void shift()
{
// IF WE WANT TO PUSH NUMBERS
if (get_index(*parsData->token) == OP_value || get_index(*parsData->token) == OP_STRING)
{
// two elements without separating operation
if (
get_index(symbolStack->topToken->token) == OP_dollar &&
get_index(tokStack->topToken->token) != OP_dollar)
{
ret = true;
retExpr = tokStack->topToken->data;
release_resources();
return;
}
if (parsData->token->token_type == T_IDENTIFIER)
{
check_func();
return;
}
else
{
stack_push(tokStack, *parsData->token);
check_symtable(tokStack->topToken);
}
//print();
} // IF WE WANT TO PUSH SYMBOLS
else if (get_index(*parsData->token) == OP_plus_minus || get_index(*parsData->token) == OP_mult_div ||
get_index(*parsData->token) == OP_parenth_close || get_index(*parsData->token) == OP_parenth_open ||
get_index(*parsData->token) == OP_rel_comp || get_index(*parsData->token) == OP_and ||
get_index(*parsData->token) == OP_or || get_index(*parsData->token) == OP_neg ||
get_index(*parsData->token) == OP_dollar)
{
stack_push(symbolStack, *parsData->token);
get_next_token(parsData->token);
if (
get_index(symbolStack->topToken->token) != OP_dollar &&
parsData->token->token_type == T_EOL)
{
next.token_type = parsData->token->token_type;
next.attr = parsData->token->attr;
skip_empty();
parsData->token->token_type = next.token_type;
parsData->token->attr = next.attr;
}
ret = true;
}
else
{
release_resources();
error(2, "expression parser", "shift", "Missing an expression");
}
if (!ret)
get_next_token(parsData->token);
else
ret = false;
// ERROR if '(' is followed by ')' without expression ... f.e. a= 5+5*()5
if (
symbolStack->topToken->token.token_type == T_L_BRACKET &&
parsData->token->token_type == T_R_BRACKET &&
get_index(tokStack->topToken->token) == OP_dollar)
{
release_resources();
error(2, "expression parser", "shift", "Missing an expression");
}
}
void int_to_float(stackElemPtr elem)
{
instr_t *instrI2F = instr_create();
instr_set_type(instrI2F, IC_INT2FLOAT_VAR);
instr_add_dest(instrI2F, elem->data);
instr_add_elem1(instrI2F, elem->data);
list_add(list, instrI2F);
}
void reduce()
{
//print();
stackElemPtr tokenTop = tokStack->topToken; // Top member on VALUE stack
stackElemPtr tokenAfterTop = tokStack->topToken->nextTok; // Second from the top member on VALUE stack
tToken symbolTop = symbolStack->topToken->token; // Top member on SYMBOL stack
if (symbolTop.token_type == T_NEG && tokenTop->data == NULL)
{
release_resources();
error(2, "expression parser", "reduce", "Missing an expression");
}
else if (symbolTop.token_type == T_NEG && tokenTop->data != NULL)
{
// UNARY OPERATION '!'
//IF !E IS ON STACK
if (tokenTop->expr == true)
{
//printf("\n\t\tRULE T_NEG\tE || E\n");
symtable_value_t dest = create_dest(tokenTop);
// INSTRUCTIONS
instr_t *instrNEG = instr_create();
instr_set_type(instrNEG, IC_NOT_VAR);
instr_add_dest(instrNEG, dest);
instr_add_elem1(instrNEG, tokenTop->data);
list_add(list, instrNEG);
retExpr = dest;
tokenTop->data = dest;
stack_pop(symbolStack);
} //IF 5 IS ON STACK
else if (tokenTop->token.token_type != T_EXPR)
{
// IF !5 IS ON STACK
check_expr(&(tokenTop->token));
//printf("\n\t\tRULE\tE -> id\n");
tokenTop->expr = true;
}
else
{
release_resources();
error(2, "expression parser", "reduce", "FAULTY INPUT EXPRESSION");
}
}
else
{
// BINARY OPERATIONS
if (tokenTop->data == NULL || tokenAfterTop->data == NULL)
{
release_resources();
error(2, "expression parser", "reduce", "Missing an expression");
}
if ((tokenTop->data->symbol.sym_var_item->type == VAR_BOOL
&& tokenAfterTop->data->symbol.sym_var_item->type == VAR_BOOL)
&& (symbolTop.token_type == T_PLUS || symbolTop.token_type == T_MINUS
||symbolTop.token_type == T_MUL ||symbolTop.token_type == T_DIV))
{
release_resources();
error(5, "expression parser", "check types", "Variable types do not match");
}
// If value stack isn't empty
if (tokStack->topToken->token.token_type != T_DOLLAR)
{
if (
!check_types(
tokenTop->data->symbol.sym_var_item,
tokenAfterTop->data->symbol.sym_var_item))
{
release_resources();
error(5, "expression parser", "check types", "Variable types do not match");
}
if (tokenTop->data->symbol.sym_var_item->type == VAR_STRING)
{
check_string(tokenTop, tokenAfterTop, &symbolTop);
}
switch (symbolTop.token_type)
{
case T_PLUS:
//IF E + E IS ON STACK
if (tokenTop->expr == true && tokenAfterTop->expr == true)
{
symtable_value_t dest = create_dest(tokenTop);
if (tokenTop->originalType == T_STRING_VALUE || tokenAfterTop->originalType == T_STRING_VALUE)
{
// Because valgring was fucking me up about conditional jump on uninitialised value
dest->symbol.sym_var_item->data.string_t = NULL;
// STRING CONCATENATION
instr_t *instrCONCAT = instr_create();
instr_set_type(instrCONCAT, IC_CONCAT_STR);
instr_add_dest(instrCONCAT, dest);
instr_add_elem1(instrCONCAT, tokenAfterTop->data);
instr_add_elem2(instrCONCAT, tokenTop->data);
list_add(list, instrCONCAT);
// printf("GOT HERE\n\n"); exit(0);
}
else
{
// Number addition
// INSTRUCTIONS
instr_t *instrADD = instr_create();
instr_set_type(instrADD, IC_ADD_VAR);
instr_add_dest(instrADD, dest);
instr_add_elem1(instrADD, tokenAfterTop->data);
instr_add_elem2(instrADD, tokenTop->data);
list_add(list, instrADD);
}
tokenAfterTop->data = dest;
retExpr = dest;
stack_pop(symbolStack);
stack_pop(tokStack);
} //IF 5 + E IS ON STACK
else if (tokenAfterTop->expr == false)
{
//// printf("\n\t\tRULE +\tE -> id\n");
// IF $+E IS ON STACK
check_expr(&(tokenAfterTop->token));
tokenAfterTop->expr = true;
} //IF E + 5 IS ON STACK
else if (tokenTop->expr == false)
{
// IF E+ IS ON STACK
//// printf("\n\t\tRULE +\tE -> id\n");
check_expr(&(tokenTop->token));
// TO DO INSERT INSTRUCTIONS
tokenTop->expr = true;
}
else
{
release_resources();
error(2, "expression parser", "reduce", "FAULTY INPUT EXPRESSION");
}
break;
case T_MINUS:
//IF E - E IS ON STACK
if (tokenTop->expr == true && tokenAfterTop->expr == true)
{
//// printf("\n\t\tRULE T_MINUS\tE = E - E\n");
symtable_value_t dest = create_dest(tokenTop);
//INSTRUCTIONS
instr_t *instrSUB = instr_create();
instr_set_type(instrSUB, IC_SUB_VAR);
instr_add_dest(instrSUB, dest);
instr_add_elem1(instrSUB, tokenAfterTop->data);
instr_add_elem2(instrSUB, tokenTop->data);
list_add(list, instrSUB);
tokenAfterTop->data = dest;
retExpr = dest;
stack_pop(symbolStack);
stack_pop(tokStack);
} //IF 5 - E IS ON STACK
else if (tokenAfterTop->expr == false)
{
// IF $-E IS ON STACK
check_expr(&(tokenAfterTop->token));
//// printf("\n\t\tRULE -\tE -> id\n");
tokenAfterTop->expr = true;
} //IF E - 5 IS ON STACK
else if (tokenTop->expr == false)
{
// IF E- IS ON STACK
check_expr(&(tokenTop->token));
// TO DO INSERT INSTRUCTIONS
//// printf("\n\t\tRULE -\tE -> id\n");
tokenTop->expr = true;
}
else
{
release_resources();
error(2, "expression parser", "reduce", "FAULTY INPUT EXPRESSION");
}
break;
case T_MUL:
//IF E * E IS ON STACK
if (tokenTop->expr == true && tokenAfterTop->expr == true)
{
//// printf("\n\t\tRULE T_MUL\tE = E * E\n");
symtable_value_t dest = create_dest(tokenTop);
// INSTRUCTIONS
instr_t *instrMUL = instr_create();
instr_set_type(instrMUL, IC_MUL_VAR);
instr_add_dest(instrMUL, dest);
instr_add_elem1(instrMUL, tokenAfterTop->data);
instr_add_elem2(instrMUL, tokenTop->data);
list_add(list, instrMUL);
tokenAfterTop->data = dest;
retExpr = dest;
stack_pop(symbolStack);
stack_pop(tokStack);
} //IF 5 * E IS ON STACK
else if (tokenAfterTop->expr == false)
{
// IF $*E IS ON STACK
//// printf("\n\t\tRULE *\tE -> id\n");
check_expr(&(tokenAfterTop->token));
tokenAfterTop->expr = true;
} //IF E * 5 IS ON STACK
else if (tokenTop->expr == false)
{
// IF E* IS ON STACK
//// printf("\n\t\tRULE *\tE -> id\n");
check_expr(&(tokenTop->token));
tokenTop->expr = true;
}
else
{
release_resources();
error(2, "expression parser", "reduce", "FAULTY INPUT EXPRESSION");
}
break;
case T_DIV:
//IF E / E IS ON STACK
if (tokenTop->expr == true && tokenAfterTop->expr == true)
{
//printf("\n\t\tRULE T_DIV\tE = E / E\n");
// DIVIDING BY ZERO
if (tokenTop->token.attr.int_lit == 0)
{
release_resources();
error(9, "expression parser", "reduce", "Division by ZERO");
}
symtable_value_t dest = create_dest(tokenTop);
// INSTRUCTIONS
instr_t *instrDIV = instr_create();
instr_set_type(instrDIV, IC_DIV_VAR);
instr_add_dest(instrDIV, dest);
instr_add_elem1(instrDIV, tokenAfterTop->data);
instr_add_elem2(instrDIV, tokenTop->data);
list_add(list, instrDIV);
tokenAfterTop->data = dest;
retExpr = dest;
stack_pop(symbolStack);
stack_pop(tokStack);
} //IF 5 / E IS ON STACK
else if (tokenAfterTop->expr == false)
{
// IF $/E IS ON STACK
check_expr(&(tokenAfterTop->token));
//printf("\n\t\tRULE\tE -> id\n");
tokenAfterTop->expr = true;
} //IF E / 5 IS ON STACK
else if (tokenTop->expr == false)
{
// IF E/ IS ON STACK
check_expr(&(tokenTop->token));
// TO DO INSERT INSTRUCTIONS
//printf("\n\t\tRULE\tE -> id\n");
tokenTop->expr = true;
}
else
{
release_resources();
error(2, "expression parser", "reduce", "FAULTY INPUT EXPRESSION");
}
break;
case T_LESS:
//IF E < E IS ON STACK
if (tokenTop->expr == true && tokenAfterTop->expr == true)
{
//printf("\n\t\tRULE T_LESS\tE < E\n");
symtable_value_t dest = create_dest(tokenTop);
// INSTRUCTIONS
instr_t *instrLT = instr_create();
instr_set_type(instrLT, IC_LT_VAR);
instr_add_dest(instrLT, dest);
instr_add_elem1(instrLT, tokenAfterTop->data);
instr_add_elem2(instrLT, tokenTop->data);
list_add(list, instrLT);
tokenAfterTop->data = dest;
retExpr = dest;
stack_pop(symbolStack);
stack_pop(tokStack);
} //IF 5 < E IS ON STACK
else if (tokenAfterTop->expr == false)
{
// IF $<E IS ON STACK
check_expr(&(tokenAfterTop->token));
//printf("\n\t\tRULE <\tE -> id\n");
tokenAfterTop->expr = true;
} //IF E < 5 IS ON STACK
else if (tokenTop->expr == false)
{
// IF E< IS ON STACK
check_expr(&(tokenTop->token));
// TO DO INSERT INSTRUCTIONS
//printf("\n\t\tRULE <\tE -> id\n");
tokenTop->expr = true;
}
else
{
release_resources();
error(2, "expression parser", "reduce", "FAULTY INPUT EXPRESSION");
}
break;
case T_LESS_EQ:
//IF E <= E IS ON STACK
if (tokenTop->expr == true && tokenAfterTop->expr == true)
{
//printf("\n\t\tRULE T_LESS_EQ\tE <= E\n");
symtable_value_t tmpDestLT = create_dest(tokenTop);
symtable_value_t tmpDestEQ = create_dest(tokenTop);
symtable_value_t tmpDestRet = create_dest(tokenTop);
//printf("\n DEST1 EXPRESSION\t %s\n", tmpDestLT->symbol.sym_var_item->name);
//printf("\n DEST2 EXPRESSION\t %s\n", tmpDestEQ->symbol.sym_var_item->name);
//printf("\n DEST3 EXPRESSION\t %s\n", tmpDestRet->symbol.sym_var_item->name);
// INSTRUCTIONS
instr_t *instrLT = instr_create();
instr_set_type(instrLT, IC_LT_VAR);
instr_add_dest(instrLT, tmpDestLT);
instr_add_elem1(instrLT, tokenAfterTop->data);
instr_add_elem2(instrLT, tokenTop->data);
list_add(list, instrLT);
instr_t *instrEQ = instr_create();
instr_set_type(instrEQ, IC_EQ_VAR);
instr_add_dest(instrEQ, tmpDestEQ);
instr_add_elem1(instrEQ, tokenAfterTop->data);
instr_add_elem2(instrEQ, tokenTop->data);
list_add(list, instrEQ);
instr_t *instrOR = instr_create();
instr_set_type(instrOR, IC_OR_VAR);
instr_add_dest(instrOR, tmpDestRet);
instr_add_elem1(instrOR, tmpDestEQ);
instr_add_elem2(instrOR, tmpDestLT);
list_add(list, instrOR);
retExpr = tmpDestRet;
stack_pop(symbolStack);
stack_pop(tokStack);
tokenAfterTop->data = tmpDestRet;
} //IF 5 <= E IS ON STACK
else if (tokenAfterTop->expr == false)
{
// IF <=E IS ON STACK
check_expr(&(tokenAfterTop->token));
//printf("\n\t\tRULE\tE -> id\n");
tokenAfterTop->expr = true;
} //IF E <= 5 IS ON STACK
else if (tokenTop->expr == false)
{
// IF E<= IS ON STACK
check_expr(&(tokenTop->token));
// TO DO INSERT INSTRUCTIONS
//printf("\n\t\tRULE\tE -> id\n");
tokenTop->expr = true;
}
else
{
release_resources();
error(2, "expression parser", "reduce", "FAULTY INPUT EXPRESSION");
}
break;
case T_GREATER:
//IF E > E IS ON STACK
if (tokenTop->expr == true && tokenAfterTop->expr == true)
{
//printf("\n\t\tRULE T_GREATER\tE > E\n");
symtable_value_t dest = create_dest(tokenTop);
//printf("\n DEST EXPRESSION\t %s\n", dest->symbol.sym_var_item->name);
// INSTRUCTIONS
instr_t *instrGT = instr_create();
instr_set_type(instrGT, IC_GT_VAR);
instr_add_dest(instrGT, dest);
instr_add_elem1(instrGT, tokenAfterTop->data);
instr_add_elem2(instrGT, tokenTop->data);
list_add(list, instrGT);
retExpr = dest;
stack_pop(symbolStack);
stack_pop(tokStack);
tokenAfterTop->data = dest;
} //IF 5 > E IS ON STACK
else if (tokenAfterTop->expr == false)
{
// IF $>E IS ON STACK
check_expr(&(tokenAfterTop->token));
//printf("\n\t\tRULE\tE -> id\n");
tokenAfterTop->expr = true;
} //IF E > 5 IS ON STACK
else if (tokenTop->expr == false)
{
// IF E > IS ON STACK
check_expr(&(tokenTop->token));
// TO DO INSERT INSTRUCTIONS
//printf("\n\t\tRULE\tE -> id\n");
tokenTop->expr = true;
}
else
{