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expr.c
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expr.c
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#include "decl.h"
#include "expr.h"
#include "scope.h"
#include "param_list.h"
#include <stdlib.h>
#include <string.h>
extern int indent;
extern int error_counter;
extern int string_counter;
int condition_counter = 0;
int done_counter = 0;
struct expr * expr_create(
expr_t kind,
struct expr *left,
struct expr *right,
struct expr *next
){
// create new struct
struct expr *new_expression = malloc(sizeof(struct expr));
new_expression->kind = kind;
new_expression->left = left;
new_expression->right = right;
new_expression->next = next;
new_expression->next_array_dimension = 0;
new_expression->name = 0;
new_expression->symbol = 0;
new_expression->literal_value = 0;
new_expression->string_literal = 0;
new_expression->type = 0;
new_expression->reg = 0;
return new_expression;
}
void expr_append(struct expr *original_list, struct expr *new_expr){
if (original_list->next != 0) {
// search for end of list
expr_append( original_list->next, new_expr);
} else {
// add to end of list
original_list->next = new_expr;
new_expr->next = 0;
return;
}
}
struct expr * expr_create_name( const char *n ){
struct expr *new_expression = malloc(sizeof(struct expr));
new_expression->kind = EXPR_IDENTIFIER;
new_expression->left = 0;
new_expression->right = 0;
new_expression->next = 0;
new_expression->next_array_dimension = 0;
new_expression->name = n;
new_expression->symbol = 0;
new_expression->literal_value = 0;
new_expression->string_literal = 0;
new_expression->type = 0;
new_expression->reg = 0;
return new_expression;
}
struct expr * expr_create_boolean_literal( int c ){
struct expr *new_expression = malloc(sizeof(struct expr));
new_expression->kind = EXPR_BOOLEAN_LITERAL;
new_expression->left = 0;
new_expression->right = 0;
new_expression->next = 0;
new_expression->next_array_dimension = 0;
new_expression->name = 0;
new_expression->symbol = 0;
new_expression->literal_value = c;
new_expression->string_literal = 0;
new_expression->type = 0;
new_expression->reg = 0;
return new_expression;
}
struct expr * expr_create_integer_literal( int c ){
struct expr *new_expression = malloc(sizeof(struct expr));
new_expression->kind = EXPR_INTEGER_LITERAL;
new_expression->left = 0;
new_expression->right = 0;
new_expression->next = 0;
new_expression->next_array_dimension = 0;
new_expression->name = 0;
new_expression->symbol = 0;
new_expression->literal_value = c;
new_expression->string_literal = 0;
new_expression->type = 0;
new_expression->reg = 0;
return new_expression;
}
struct expr * expr_create_character_literal( int c ){
struct expr *new_expression = malloc(sizeof(struct expr));
new_expression->kind = EXPR_CHARACTER_LITERAL;
new_expression->left = 0;
new_expression->right = 0;
new_expression->next = 0;
new_expression->next_array_dimension = 0;
new_expression->name = 0;
new_expression->symbol = 0;
new_expression->literal_value = c;
new_expression->string_literal = 0;
new_expression->type = 0;
new_expression->reg = 0;
return new_expression;
}
struct expr * expr_create_string_literal( const char *str ){
struct expr *new_expression = malloc(sizeof(struct expr));
new_expression->kind = EXPR_STRING_LITERAL;
new_expression->left = 0;
new_expression->right = 0;
new_expression->next = 0;
new_expression->next_array_dimension = 0;
new_expression->name = 0;
new_expression->symbol = 0;
new_expression->literal_value = 0;
new_expression->string_literal = str;
new_expression->type = 0;
new_expression->reg = 0;
return new_expression;
}
void expr_print_error( struct expr *e ){
if (e != NULL) {
switch (e->kind){
case (EXPR_ADD):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"+");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_SUB):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"-");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_MUL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"*");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_DIV):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"/");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_INCREMENT):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"++");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_DECREMENT):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"--");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_NOT):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"!");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_POWER):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"^");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_MODULO):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"%%");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_LESS_THAN):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," < ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_GREATER_THAN):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," > ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_LESS_THAN_OR_EQUAL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," <= ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_GREATER_THAN_OR_EQUAL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," >= ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_EQUIVALENCE_COMPARISON):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," == ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_NONEQUIVALENCE_COMPARISON):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," != ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_AND):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," && ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_OR):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," || ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_ASSIGNMENT):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr," = ");
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_BOOLEAN_LITERAL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"%i",e->literal_value);
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_INTEGER_LITERAL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"%i",e->literal_value);
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_CHARACTER_LITERAL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"'%c'",e->literal_value);
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_STRING_LITERAL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"%s",e->string_literal);
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_IDENTIFIER):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"%s",e->name);
if (e->right != 0) expr_print_error(e->right);
break;
case (EXPR_PARENTHESES):
fprintf(stderr,"(");
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,")");
break;
case (EXPR_FUNCTION_CALL):
if (e->left != 0) expr_print_error(e->left);
fprintf(stderr,"(");
if (e->right != 0) expr_print_error(e->right);
fprintf(stderr,")");
break;
case (EXPR_ARRAY_INDEX):
if (e->left != 0) expr_print_error(e->left);
struct expr *tmp = malloc(sizeof(struct expr));
tmp = e->right;
while (tmp != NULL){
fprintf(stderr,"[");
expr_print_error(tmp);
fprintf(stderr,"]");
tmp = tmp->next_array_dimension;
}
break;
}
if (e->next != NULL){
fprintf(stderr,", ");
expr_print_error(e->next);
}
}
}
void expr_print( struct expr *e ){
if (e != NULL) {
switch (e->kind){
case (EXPR_ADD):
if (e->left != 0) expr_print(e->left);
printf("+");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_SUB):
if (e->left != 0) expr_print(e->left);
printf("-");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_MUL):
if (e->left != 0) expr_print(e->left);
printf("*");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_DIV):
if (e->left != 0) expr_print(e->left);
printf("/");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_INCREMENT):
if (e->left != 0) expr_print(e->left);
printf("++");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_DECREMENT):
if (e->left != 0) expr_print(e->left);
printf("--");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_NOT):
if (e->left != 0) expr_print(e->left);
printf("!");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_POWER):
if (e->left != 0) expr_print(e->left);
printf("^");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_MODULO):
if (e->left != 0) expr_print(e->left);
printf("%%");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_LESS_THAN):
if (e->left != 0) expr_print(e->left);
printf(" < ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_GREATER_THAN):
if (e->left != 0) expr_print(e->left);
printf(" > ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_LESS_THAN_OR_EQUAL):
if (e->left != 0) expr_print(e->left);
printf(" <= ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_GREATER_THAN_OR_EQUAL):
if (e->left != 0) expr_print(e->left);
printf(" >= ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_EQUIVALENCE_COMPARISON):
if (e->left != 0) expr_print(e->left);
printf(" == ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_NONEQUIVALENCE_COMPARISON):
if (e->left != 0) expr_print(e->left);
printf(" != ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_AND):
if (e->left != 0) expr_print(e->left);
printf(" && ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_OR):
if (e->left != 0) expr_print(e->left);
printf(" || ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_ASSIGNMENT):
if (e->left != 0) expr_print(e->left);
printf(" = ");
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_BOOLEAN_LITERAL):
if (e->left != 0) expr_print(e->left);
printf("%i",e->literal_value);
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_INTEGER_LITERAL):
if (e->left != 0) expr_print(e->left);
printf("%i",e->literal_value);
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_CHARACTER_LITERAL):
if (e->left != 0) expr_print(e->left);
printf("'%c'",e->literal_value);
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_STRING_LITERAL):
if (e->left != 0) expr_print(e->left);
printf("%s",e->string_literal);
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_IDENTIFIER):
if (e->left != 0) expr_print(e->left);
printf("%s",e->name);
if (e->right != 0) expr_print(e->right);
break;
case (EXPR_PARENTHESES):
printf("(");
if (e->left != 0) expr_print(e->left);
printf(")");
break;
case (EXPR_FUNCTION_CALL):
if (e->left != 0) expr_print(e->left);
printf("(");
if (e->right != 0) expr_print(e->right);
printf(")");
break;
case (EXPR_ARRAY_INDEX):
if (e->left != 0) expr_print(e->left);
struct expr *tmp = malloc(sizeof(struct expr));
tmp = e->right;
while (tmp != NULL){
printf("[");
expr_print(tmp);
printf("]");
tmp = tmp->next_array_dimension;
}
break;
}
if (e->next != NULL){
printf(", ");
expr_print(e->next);
}
}
}
void expr_resolve(struct expr *e){
if (e == NULL) {
return;
}
expr_resolve(e->left);
expr_resolve(e->right);
if (e->kind==EXPR_IDENTIFIER){
struct symbol *s = scope_lookup(e->name);
if (s != NULL){
e->symbol = s;
char *this_variable = malloc(sizeof(char) * 10);
switch (s->kind){
case SYMBOL_LOCAL:
sprintf(this_variable,"LOCAL %i",s->which);
break;
case SYMBOL_GLOBAL:
sprintf(this_variable,"GLOBAL %s",s->name);
break;
case SYMBOL_PARAM:
sprintf(this_variable,"PARAM %i",s->which);
break;
default:
fprintf(stderr,"Scope not recognized for symbol: %s\n",e->name);
error_counter += 1;
break;
}
printf("%s resolved to %s\n",e->name,this_variable);
} else {
fprintf(stderr,"Symbol %s not declared\n",e->name);
error_counter += 1;
}
}
expr_resolve(e->next);
}
struct type *expr_typecheck(struct expr *e, struct decl *d){
if (e == NULL) {
return type_create(TYPE_VOID,0,0,0);
}
struct type *l = malloc(sizeof(struct type));
struct type *r = malloc(sizeof(struct type));
switch (e->kind){
case (EXPR_ADD):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot add ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_SUB):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
if (l->kind == TYPE_VOID) { // unary minor
e->type = type_create(TYPE_INTEGER,0,0,0);
} else {
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot subtract ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," from ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_MUL):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot multiply ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," and ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_DIV):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot divide ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," by ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_INCREMENT):
l = expr_typecheck(e->left,d);
if (l->kind != TYPE_INTEGER){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot increment ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_DECREMENT):
l = expr_typecheck(e->left,d);
if (l->kind != TYPE_INTEGER){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot decrement ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_NOT):
r = expr_typecheck(e->right,d);
if (r->kind != TYPE_BOOLEAN){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot negate ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_POWER):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot raise ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to power ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_MODULO):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot take modulus of ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," and ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_INTEGER,0,0,0);
break;
case (EXPR_LESS_THAN):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_GREATER_THAN):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_LESS_THAN_OR_EQUAL):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_GREATER_THAN_OR_EQUAL):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_INTEGER) || (r->kind != TYPE_INTEGER)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_EQUIVALENCE_COMPARISON):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind == TYPE_FUNCTION) || (r->kind == TYPE_FUNCTION)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare equivalence of functions\n");
} else if ((l->kind == TYPE_ARRAY) || (r->kind == TYPE_ARRAY)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare equivalence of arrays\n");
} else if (l->kind != r->kind){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare equivalence of ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_NONEQUIVALENCE_COMPARISON):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind == TYPE_FUNCTION) || (r->kind == TYPE_FUNCTION)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare equivalence of functions\n");
} else if ((l->kind == TYPE_ARRAY) || (r->kind == TYPE_ARRAY)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare equivalence of arrays\n");
} else if (l->kind != r->kind){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare equivalence of ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_AND):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_BOOLEAN) || (r->kind != TYPE_BOOLEAN)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_OR):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
if ((l->kind != TYPE_BOOLEAN) || (r->kind != TYPE_BOOLEAN)){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot compare ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr," to ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr,"\n");
}
e->type = type_create(TYPE_BOOLEAN,0,0,0);
break;
case (EXPR_ASSIGNMENT):
/**************************/
l = expr_typecheck(e->left,d);
if (l->kind == TYPE_ARRAY) {
type_kind_t expected_type;
if (l->subtype != NULL) {
expected_type = l->subtype->kind;
} else {
expected_type = l->kind;
}
struct expr *elist = e->right;
while (elist != NULL) {
r = expr_typecheck(elist,d);
type_kind_t given_type = elist->type->kind;
if (expected_type != given_type) {
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot assign ");
type_print_error(r);
literal_print_error(elist);
fprintf(stderr," to an element of ");
type_print_error(l);
struct expr *etmp = e->left;
if (e->left->kind == EXPR_ARRAY_INDEX){
etmp = etmp->left;
}
struct type *ttmp = etmp->type->subtype;
while (ttmp->kind == TYPE_ARRAY) {
ttmp = ttmp->subtype;
}
literal_print_error(etmp);
fprintf(stderr,"\n");
}
elist = elist->next;
}
/**************************/
} else {
r = expr_typecheck(e->right,d);
//if ((l->kind == TYPE_FUNCTION) || (r->kind == TYPE_FUNCTION)){
if (l->kind == TYPE_FUNCTION){
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot assign a function\n");
} else if (l->kind != r->kind) {
error_counter += 1;
fprintf(stderr,"Error #%i ",error_counter);
fprintf(stderr,"type error: cannot assign ");
type_print_error(r);
literal_print_error(e->right);
fprintf(stderr," to ");
type_print_error(l);
literal_print_error(e->left);
fprintf(stderr,"\n");
}
}
e->type = type_create(l->kind,0,0,0);
break;
case (EXPR_BOOLEAN_LITERAL):
e->type = type_create(TYPE_BOOLEAN, 0, 0, 0);
break;
case (EXPR_INTEGER_LITERAL):
e->type = type_create(TYPE_INTEGER, 0, 0, 0);
break;
case (EXPR_CHARACTER_LITERAL):
e->type = type_create(TYPE_CHARACTER, 0, 0, 0);
break;
case (EXPR_STRING_LITERAL):
e->type = type_create(TYPE_STRING, 0, 0, 0);
break;
case (EXPR_IDENTIFIER):
e->type = e->symbol->type;
break;
case (EXPR_PARENTHESES):
e->type = expr_typecheck(e->left,d);
break;
case (EXPR_FUNCTION_CALL):
// check parameters
param_list_typecheck(e->left->name,e->right,d);
e->type = e->left->symbol->type->subtype;
break;
case (EXPR_ARRAY_INDEX):
l = expr_typecheck(e->left,d);
r = expr_typecheck(e->right,d);
e->type = type_create(TYPE_ARRAY, 0, 0, 0);
expr_typecheck(e->next_array_dimension,d);
break;
}
return e->type;
}
void literal_print_error(struct expr *e){
if (e->type == NULL) return;
switch (e->type->kind){
case (TYPE_BOOLEAN):
fprintf(stderr," (%i)",e->literal_value);
break;
case (TYPE_CHARACTER):
fprintf(stderr," (%c)",e->literal_value);
break;
case (TYPE_INTEGER):
fprintf(stderr," (%i)",e->literal_value);
break;
case (TYPE_STRING):
fprintf(stderr," (%s)",e->string_literal);
break;
case (TYPE_ARRAY):
fprintf(stderr," (%s)",e->name);
break;
case (TYPE_FUNCTION):
fprintf(stderr," (%s)",e->left->name);
break;
case (TYPE_VOID):
break;
}
}
void literal_print(struct expr *e){
if (e->type == NULL) return;
switch (e->type->kind){
case (TYPE_BOOLEAN):
printf(" (%i)",e->literal_value);
break;
case (TYPE_CHARACTER):
printf(" (%c)",e->literal_value);
break;
case (TYPE_INTEGER):
printf(" (%i)",e->literal_value);
break;
case (TYPE_STRING):
printf(" (%s)",e->string_literal);
break;
case (TYPE_ARRAY):
printf(" (%s)",e->name);
break;
case (TYPE_FUNCTION):
printf(" (%s)",e->left->name);
break;
case (TYPE_VOID):
break;
}
}
void expr_codegen(struct expr *e, FILE *fd){
if (!e) return;
// TODO finish the other cases
switch (e->kind){
case EXPR_ADD:
// recurse
expr_codegen(e->left,fd);
expr_codegen(e->right,fd);
// print to assembly file
fprintf(fd," add %s, %s\n",register_name(e->left->reg),register_name(e->right->reg));
// update AST
e->reg = e->right->reg;
// cleanup
register_free(e->left->reg);
e->left->reg = -1;
break;
case EXPR_SUB:
// recurse
expr_codegen(e->left,fd);
expr_codegen(e->right,fd);
// print to assembly file
fprintf(fd," sub %s, %s\n",register_name(e->right->reg),register_name(e->left->reg));
// update ast
e->reg = e->left->reg;
// cleanup
register_free(e->right->reg);
e->right->reg = -1;
break;
case EXPR_MUL:
// recurse
expr_codegen(e->left,fd);
expr_codegen(e->right,fd);
// print to assembly file
fprintf(fd," mov %s, %%rax\n",register_name(e->left->reg));
fprintf(fd," imul %s\n",register_name(e->right->reg)); // implicitly multiply by %rax, leaves result in %rax
fprintf(fd," mov %%rax, %s\n",register_name(e->right->reg)); // store result in right register
// update ast
e->reg = e->right->reg;
// cleanup
register_free(e->left->reg);
e->left->reg = -1;
break;
case EXPR_DIV:
// recurse
expr_codegen(e->left,fd);
expr_codegen(e->right,fd);
// print to assembly file
fprintf(fd," movq %s, %%rax\n",register_name(e->left->reg));
fprintf(fd," cltd\n"); // could have to be cdq0
fprintf(fd," divq %s\n",register_name(e->right->reg)); // implicitly multiply by %rax, leaves result in %rax
fprintf(fd," mov %%rax, %s\n",register_name(e->right->reg)); // store result in right register
// update ast
e->reg = e->right->reg;
// cleanup
register_free(e->left->reg);
e->left->reg = -1;
break;
case EXPR_INCREMENT:
// recurse
expr_codegen(e->left,fd);
// print to assembly file
fprintf(fd," add $1, %s\n",register_name(e->left->reg));
// update ast
e->reg = e->left->reg;
break;
case EXPR_DECREMENT:
// recurse
expr_codegen(e->left,fd);
// print to assembly file
fprintf(fd," sub $1, %s\n",register_name(e->left->reg));