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code_gen.c
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code_gen.c
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/**
* @file code_gen.c
* Projekt: Implementace prekladace imperativniho jazyka IFJ21.
* @author Jakub Kozubek <xkozub07@stud.fit.vutbr.cz>
* @author Tadeas Vintrlik <xvintr04@stud.fit.vutbr.cz>
* @brief Implementation of code generator.
*/
#include "code_gen.h"
#include "common.h"
#include "sll.h"
static unsigned counter = 0;
static sll_s call_list;
typedef struct call {
T_token *function;
tstack_s *params_in;
} call_s;
static void escape_string(dynamic_string_s **ds)
{
dynamic_string_s *new_ds = malloc(sizeof *new_ds);
ALLOC_CHECK(new_ds);
ds_init(new_ds);
dynamic_string_s *old_ds = *ds;
char c;
for (unsigned i = 0; i < old_ds->size; i++) {
switch (old_ds->content[i]) {
case ' ':
ds_add_char(new_ds, '\\');
ds_add_char(new_ds, '0');
ds_add_char(new_ds, '3');
ds_add_char(new_ds, '2');
break;
case '\\':
c = old_ds->content[++i];
if (c) {
switch (c) {
case 'n':
ds_add_char(new_ds, '\\');
ds_add_char(new_ds, '0');
ds_add_char(new_ds, '1');
ds_add_char(new_ds, '0');
break;
case 't':
ds_add_char(new_ds, '\\');
ds_add_char(new_ds, '0');
ds_add_char(new_ds, '0');
ds_add_char(new_ds, '9');
break;
case '\"':
ds_add_char(new_ds, '\\');
ds_add_char(new_ds, '0');
ds_add_char(new_ds, '3');
ds_add_char(new_ds, '4');
break;
case '\\':
ds_add_char(new_ds, '\\');
ds_add_char(new_ds, '0');
ds_add_char(new_ds, '9');
ds_add_char(new_ds, '2');
break;
default:
ds_add_char(new_ds, '\\');
ds_add_char(new_ds, old_ds->content[i]);
break;
}
}
break;
default:
ds_add_char(new_ds, old_ds->content[i]);
break;
}
}
ds_destroy(old_ds);
FREE(old_ds);
*ds = new_ds;
}
static void escape_float(dynamic_string_s **ds)
{
dynamic_string_s *new = malloc(sizeof(dynamic_string_s));
ALLOC_CHECK(new);
ds_init(new);
float raw_value = atof((*ds)->content);
int buffer_size = 32;
char *str = malloc(buffer_size);
ALLOC_CHECK(str);
snprintf(str, buffer_size, "%a", raw_value);
char *current_char = str;
while (*current_char != '\0') {
ds_add_char(new, *current_char);
current_char++;
}
FREE(str);
ds_destroy(*ds);
free(*ds);
*ds = new;
}
static void generate_built_ins(void);
static call_s *call_constructor(T_token *function, tstack_s *params_in)
{
call_s *result = malloc(sizeof *result);
ALLOC_CHECK(result);
result->function = function;
result->params_in = params_in;
return result;
}
static void call_destructor(call_s *call)
{
/* call->function is stored on global frame and need not be freed here */
tstack_destroy(call->params_in);
}
void gen_call_insert(T_token *function, tstack_s *params_in)
{
sll_insert_last(&call_list, call_constructor(function, params_in));
}
void gen_prog_start(void)
{
puts(".IFJcode21");
puts("DEFVAR GF@%tmp1");
puts("DEFVAR GF@%tmp2");
puts("JUMP $%main");
generate_built_ins();
sll_init(&call_list);
}
/**
* @brief Move input parameters to their actual variable names.
*
* @param in_params Stack of all the parameters of the function.
*/
static void gen_pop_arg(tstack_s *in_params)
{
T_token *token;
unsigned i;
i = 0;
sll_activate(in_params);
while (sll_is_active(in_params)) {
token = sll_get_active(in_params);
printf("DEFVAR LF@%s\n", token->value->content);
printf("MOVE LF@%s LF@%%p%d\n", token->value->content, i);
i++;
sll_next(in_params);
}
}
void gen_func_start(const char *func_name, tstack_s *in_params, unsigned no_returns)
{
unsigned i = 0;
/* Create label for calls to jump to and PUSH TF to LF */
printf("\nLABEL $-%s\n", func_name);
puts("PUSHFRAME");
/* Create variables for return values */
for (i = 0; i < no_returns; i++) {
printf("DEFVAR LF@%%retval%d\n", i);
printf("MOVE LF@%%retval%d nil@nil\n", i);
}
gen_pop_arg(in_params);
}
void gen_func_end()
{
/* Push current LF as TF for caller to pop the return values and return to addres */
puts("POPFRAME");
puts("RETURN");
}
unsigned gen_jump_else(void)
{
unsigned ret;
puts("POPS GF@%tmp1");
printf("JUMPIFNEQ $-else-%d GF@%%tmp1 bool@true\n", counter);
ret = counter;
counter++;
return ret;
}
void gen_else_label(unsigned label_number)
{
printf("JUMP $-end-%d\n", label_number);
printf("LABEL $-else-%d\n", label_number);
}
void gen_if_end(unsigned label_number) { printf("LABEL $-end-%d\n", label_number); }
unsigned gen_while_label(void)
{
unsigned ret;
printf("LABEL $-while-%d\n", counter);
ret = counter;
counter++;
return ret;
}
void gen_while_jump_loop(unsigned label_number) { printf("JUMP $-while-%d\n", label_number); }
void gen_while_jump_end(unsigned label_number)
{
puts("POPS GF@%tmp1");
printf("JUMPIFNEQ $-end-%d GF@%%tmp1 bool@true\n", label_number);
}
void gen_while_end_label(unsigned label_number) { printf("LABEL $-end-%d\n", label_number); }
static void gen_push_arg(T_token *fun_symbol, tstack_s *in_params)
{
T_token *token;
unsigned i = 0;
sll_activate(fun_symbol->fun_info->in_params);
/* Move all in paramters values to correct variables */
while (!tstack_empty(in_params)) {
T_token *fun_in = sll_get_active(fun_symbol->fun_info->in_params);
token = tstack_top(in_params);
tstack_pop(in_params, false);
printf("DEFVAR TF@%%p%d\n", i);
switch (token->type) {
case TOKEN_ID:
printf("MOVE TF@%%p%d LF@%s\n", i, token->value->content);
break;
case TOKEN_INT:
printf("MOVE TF@%%p%d int@%s\n", i, token->value->content);
if (fun_in->symbol_type == SYM_TYPE_NUMBER) {
printf("INT2FLOAT TF@%%p%d TF@%%p%d\n", i, i);
}
break;
case TOKEN_NUMBER:
escape_float(&token->value);
printf("MOVE TF@%%p%d float@%s\n", i, token->value->content);
break;
case TOKEN_STRING:
printf("MOVE TF@%%p%d string@%s\n", i, token->value->content);
break;
case TOKEN_KEYWORD:
if (!strcmp(token->value->content, "nil")) {
printf("MOVE TF@%%p%d nil@nil\n", i);
} else {
/* Should not happen */
ERR_MSG("Unexpected type of input parameter: keyword on line: ", token->line);
fprintf(stderr, "%d\n", token->type);
}
break;
default:
/* Should not happen */
ERR_MSG("Unexpected type of input parameter: ", token->line);
fprintf(stderr, "%d\n", token->type);
break;
}
i++;
sll_next(fun_symbol->fun_info->in_params);
FREE(token);
}
}
void gen_func_call(T_token *fun_symbol, tstack_s *in_params)
{
if (!strcmp("write", fun_symbol->value->content)) {
gen_write(in_params);
} else {
puts("CREATEFRAME");
gen_push_arg(fun_symbol, in_params);
printf("CALL $-%s\n", fun_symbol->value->content);
}
}
void gen_function_call_list(void)
{
call_s *current_call;
puts("LABEL $%main");
puts("CREATEFRAME");
puts("PUSHFRAME");
sll_activate(&call_list);
while (sll_is_active(&call_list)) {
current_call = (call_s *)sll_get_active(&call_list);
gen_func_call(current_call->function, current_call->params_in);
call_destructor(current_call);
sll_next(&call_list);
}
sll_destroy(&call_list, true);
puts("EXIT int@0");
}
void gen_expr_operand(T_token *token)
{
switch (token->type) {
case TOKEN_ID:
printf("PUSHS LF@%s\n", token->value->content);
break;
case TOKEN_INT:
printf("PUSHS int@%s\n", token->value->content);
break;
case TOKEN_NUMBER:
escape_float(&token->value);
printf("PUSHS float@%s\n", token->value->content);
break;
case TOKEN_STRING:
escape_string(&token->value);
printf("PUSHS string@%s\n", token->value->content);
break;
case TOKEN_KEYWORD:
if (!strcmp(token->value->content, "nil")) {
puts("PUSHS nil@nil");
} else {
/* Should not happen */
ERR_MSG("Unexpected type of operand value: keyword on line: ", token->line);
fprintf(stderr, "%d\n", token->type);
}
break;
default:
/* Should not happen */
ERR_MSG("Unexpected type of operand value: ", token->line);
fprintf(stderr, "%d\n", token->type);
break;
}
}
void gen_expr_operator(T_token *token)
{
switch (token->type) {
case TOKEN_EQUAL:
puts("EQS");
break;
case TOKEN_LESS_THAN:
puts("LTS");
break;
case TOKEN_LESS_EQUAL_THAN:
puts("POPS GF@%tmp2");
puts("POPS GF@%tmp1");
puts("PUSHS GF@%tmp1");
puts("PUSHS GF@%tmp2");
puts("PUSHS GF@%tmp1");
puts("PUSHS GF@%tmp2");
puts("LTS");
puts("POPS GF@%tmp1");
puts("EQS");
puts("PUSHS GF@%tmp1");
puts("ORS");
break;
case TOKEN_GREATER_THAN:
puts("GTS");
break;
case TOKEN_GREATER_EQUAL_THAN:
puts("POPS GF@%tmp2");
puts("POPS GF@%tmp1");
puts("PUSHS GF@%tmp1");
puts("PUSHS GF@%tmp2");
puts("PUSHS GF@%tmp1");
puts("PUSHS GF@%tmp2");
puts("GTS");
puts("POPS GF@%tmp1");
puts("EQS");
puts("PUSHS GF@%tmp1");
puts("ORS");
break;
case TOKEN_DIVISION:
puts("CALL $-check-div-error");
puts("DIVS");
break;
case TOKEN_FLOOR_DIVISION:
puts("CALL $-check-div-error");
puts("IDIVS");
break;
case TOKEN_MUL:
puts("MULS");
break;
case TOKEN_SUB:
puts("SUBS");
break;
case TOKEN_NOT_EQUAL_TO:
puts("EQS");
puts("NOTS");
break;
case TOKEN_STRING_CONCAT:
puts("POPS GF@%tmp2");
puts("POPS GF@%tmp1");
puts("CONCAT GF@%tmp1 GF@%tmp1 GF@%tmp2");
puts("PUSHS GF@%tmp1");
break;
case TOKEN_ADD:
puts("ADDS");
break;
case TOKEN_STRING_LENGTH:
puts("POPS GF@%tmp1");
puts("STRLEN GF@%tmp1 GF@%tmp1");
puts("PUSHS GF@%tmp1");
break;
default:
/* Should not happen */
ERR_MSG("Unexpected type of operator value: ", token->line);
fprintf(stderr, "%d\n", token->type);
break;
}
}
void gen_expr_cond(void) { puts("POPS GF@%tmp1"); }
void gen_write(tstack_s *in_params)
{
T_token *token;
while (!tstack_empty(in_params)) {
token = tstack_top(in_params);
tstack_pop(in_params, false);
escape_string(&token->value);
puts("CREATEFRAME");
puts("DEFVAR TF@%p0");
if (token->type == TOKEN_ID) {
printf("MOVE TF@%%p0 LF@%s\n", token->value->content);
} else if (token->symbol_type == SYM_TYPE_NUMBER) {
escape_float(&token->value);
printf("MOVE TF@%%p0 float@%s\n", token->value->content);
} else {
printf("MOVE TF@%%p0 string@%s\n", token->value->content);
}
puts("CALL $-write");
}
}
void gen_var_decl(T_token *id)
{
printf("DEFVAR LF@%s\n", id->value->content);
printf("MOVE LF@%s nil@nil\n", id->value->content);
}
static void gen_reads(void)
{
tstack_s in_params;
tstack_init(&in_params);
gen_func_start("reads", &in_params, 1);
puts("READ LF@%retval0 string");
puts("POPFRAME");
puts("RETURN");
tstack_destroy(&in_params);
}
static void gen_readi(void)
{
tstack_s in_params;
tstack_init(&in_params);
gen_func_start("readi", &in_params, 1);
puts("READ LF@%retval0 int");
puts("POPFRAME");
puts("RETURN");
tstack_destroy(&in_params);
}
static void gen_readn(void)
{
tstack_s in_params;
tstack_init(&in_params);
gen_func_start("readn", &in_params, 1);
puts("READ LF@%retval0 float");
puts("POPFRAME");
puts("RETURN");
tstack_destroy(&in_params);
}
static void gen_tointeger(void)
{
tstack_s in_params;
tstack_init(&in_params);
gen_func_start("tointeger", &in_params, 1);
puts("TYPE GF@%tmp1 LF@%p0");
puts("JUMPIFNEQ $-tointeger-ok GF@%tmp1 string@nil");
puts("MOVE LF@%retval0 nil@nil");
puts("POPFRAME");
puts("RETURN");
puts("LABEL $-tointeger-ok");
puts("FLOAT2INT LF@%retval0 LF@%p0");
puts("POPFRAME");
puts("RETURN");
tstack_destroy(&in_params);
}
static void gen_substr(void)
{
tstack_s in_params;
tstack_init(&in_params);
gen_func_start("substr", &in_params, 1);
puts("MOVE LF@%retval0 string@");
puts("DEFVAR LF@%iter");
puts("DEFVAR LF@%c");
puts("DEFVAR LF@%end_index");
puts("MOVE LF@%end_index LF@%p2");
puts("MOVE LF@%iter LF@%p1");
puts("SUB LF@%iter LF@%iter int@1");
puts("DEFVAR LF@%cond");
puts("DEFVAR LF@%strlen");
puts("STRLEN LF@%strlen LF@%p0");
puts("GT LF@%cond LF@%p1 LF@%p2");
puts("JUMPIFEQ $-substr_end LF@%cond bool@true");
puts("GT LF@%cond LF@%p1 int@0");
puts("JUMPIFEQ $-substr_end LF@%cond bool@false");
puts("GT LF@%cond LF@%p2 int@0");
puts("JUMPIFEQ $-substr_end LF@%cond bool@false");
puts("GT LF@%cond LF@%p2 LF@%strlen");
puts("JUMPIFEQ $-substr_end LF@%cond bool@true");
puts("LABEL $-strloop");
puts("LT LF@%cond LF@%iter LF@%end_index");
puts("JUMPIFEQ $-substr_end LF@%cond bool@false");
puts("GETCHAR LF@%c LF@%p0 LF@%iter");
puts("CONCAT LF@%retval0 LF@%retval0 LF@%c");
puts("ADD LF@%iter LF@%iter int@1");
puts("JUMP $-strloop");
puts("LABEL $-substr_end");
puts("POPFRAME");
puts("RETURN");
tstack_destroy(&in_params);
}
static void gen_ord(void)
{
tstack_s in_params;
tstack_init(&in_params);
gen_func_start("ord", &in_params, 1);
puts("DEFVAR LF@%index");
puts("MOVE LF@%index LF@%p1");
puts("DEFVAR LF@%cond");
puts("DEFVAR LF@%strlen");
puts("STRLEN LF@%strlen LF@%p0");
puts("GT LF@%cond LF@%index int@0");
puts("JUMPIFEQ $-ord-err LF@%cond bool@false");
puts("GT LF@%cond LF@%index LF@%strlen");
puts("JUMPIFEQ $-ord-err LF@%cond bool@true");
puts("JUMP $-ord-ok");
puts("LABEL $-ord-err");
puts("EXIT int@8");
puts("LABEL $-ord-ok");
puts("MOVE LF@%index LF@%p1");
puts("SUB LF@%index LF@%index int@1");
puts("STRI2INT LF@%retval0 LF@%p0 LF@%index");
puts("POPFRAME");
puts("RETURN");
tstack_destroy(&in_params);
}
static void gen_chr(void)
{
tstack_s in_params;
gen_func_start("chr", &in_params, 1);
puts("DEFVAR LF@%cond");
puts("EQ LF@%cond nil@nil LF@%p0");
puts("JUMPIFEQ $-chr-ok LF@%cond bool@false");
puts("EXIT int@8");
puts("LABEL $-chr-ok");
puts("LT LF@%cond LF@%p0 int@0");
puts("JUMPIFEQ $-chr-end LF@%cond bool@true");
puts("GT LF@%cond LF@%p0 int@255");
puts("JUMPIFEQ $-chr-end LF@%cond bool@true");
puts("INT2CHAR LF@%retval0 LF@%p0");
puts("LABEL $-chr-end");
puts("POPFRAME");
puts("RETURN");
tstack_destroy(&in_params);
}
static void gen_builtin_write(void)
{
tstack_s in_params;
gen_func_start("write", &in_params, 1);
puts("EQ GF@%tmp1 LF@%p0 nil@nil");
puts("JUMPIFNEQ $-non-nil GF@%tmp1 bool@true");
puts("WRITE string@nil");
puts("JUMP $-write-end");
puts("LABEL $-non-nil");
puts("WRITE LF@%p0");
puts("LABEL $-write-end");
puts("POPFRAME");
puts("RETURN");
}
static void gen_check_div_error(void)
{
puts("LABEL $-check-div-error");
puts("POPS GF@%tmp1");
puts("TYPE GF@%tmp2 GF@%tmp1");
puts("JUMPIFEQ $-div-integer GF@%tmp2 string@int");
puts("JUMPIFEQ $-div-err GF@%tmp1 float@0x0p+0");
puts("JUMP $-div-ok");
puts("LABEL $-div-integer");
puts("JUMPIFEQ $-div-err GF@%tmp1 int@0");
puts("LABEL $-div-ok");
puts("PUSHS GF@%tmp1");
puts("RETURN");
puts("LABEL $-div-err");
puts("WRITE string@Zero\\032Division\\032Error!\\010");
puts("EXIT int@9");
}
static void generate_built_ins(void)
{
gen_reads();
gen_readi();
gen_readn();
gen_tointeger();
gen_substr();
gen_ord();
gen_chr();
gen_builtin_write();
gen_check_div_error();
}