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mips.h
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mips.h
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//
// Created by 23207 on 2020/11/4.
//
/*
* when func_return:
* set $v0
* jr $ra
* lw $ra, $v1
*
*
* when entering a function:
* sw $ra, STACK_TOP($sp)
* set spaces for:
*
* when assignment or initialization:
* <some operations>
* sw $s, OFFSET($sp)
*
* when calling a function:
* subi $sp, $sp, TOP_INDEX
* jal CALLEE
* addi $sp, $sp, TOP_INDEX
*/
#ifndef UNTITLED_MIPS_H
#define UNTITLED_MIPS_H
#include "quard_code.h"
#include "global.h"
#include "mips_command.h"
#include <sstream>
static string random_key = "Wh1tBA12H_";
void write_back_all_t();
void write_back_all_s();
void flush_reservation();
void clear_all();
string get_allocated_reg(const string& name);
string write_allocate_reg(const string& name, bool replace=false);
string read_allocate_reg(const string& name, bool for_write=false);
string allocate_reg_and_load(const string& var_name);
void save_spot();
map<string, int> temp_sym_tab;
map<string ,bool> temp_sym_glob;
map<string, bool> temp_sym_const;
map<string, int> temp_sym_focus;
map<string, int> temp_func_tab;
string cur_func_name = "";
int top_index = 0;
int over_flow_index = 0;
int current_top = 0;
int down_move_length;
int str2int(string in) {
stringstream ss;
ss << in;
int size;
ss >> size;
return size;
}
int get_log(int x) {
if (x < 0) x = -x;
int pow = 0;
if (x == 1 || x == 0) return -1;
while (x >= 2) {
if (x % 2 != 0) return -1;
x /= 2;
pow++;
}
return pow;
}
bool start_with(string ss, string prefix) {
if (prefix.size() > ss.size()) return false;
for (int i = 0;i < prefix.size();i++) {
if (prefix[i] != ss[i]) return false;
}
return true;
}
void push_tab(const string& name, int size, bool is_global) {
top_index += 4;
temp_sym_tab[name] = top_index;
temp_sym_glob[name] = is_global;
temp_sym_const[name] = false;
if (size - 4 > 0) {
top_index += size - 4;
}
}
void push_quot(const string& new_name, const string& old_name, bool is_global) {
temp_sym_tab[new_name] = temp_sym_tab[old_name];
temp_sym_glob[new_name] = is_global;
if (temp_sym_const[old_name]) {
temp_sym_const[new_name] = true;
temp_sym_focus[new_name] = temp_sym_focus[old_name];
}
}
void push_func(const string& name) {
temp_func_tab[name] = top_index;
}
void push_const(const string& name, int value) {
temp_sym_const[name] = true;
temp_sym_focus[name] = value;
}
bool is_temp_var(const string& name);
static int string_count = 0;
static int s_count = 0;
void set_string() {
list<Quardcode>::const_iterator iterator;
for (iterator = qcodes.cbegin(); iterator != qcodes.cend(); iterator++) {
Quardcode pc = *iterator;
if (pc.type == "print_s") {
string string_name = random_key + "string_" + to_string(string_count);
string_count++;
allocate_string(string_name, pc.dst);
}
}
}
void set_temp_sym_tab() {
list<Quardcode>::const_iterator iterator;
bool is_glob = true;
push_const("std::endl", int('\n'));
for (iterator = qcodes.cbegin(); iterator != qcodes.cend(); iterator++) {
Quardcode pc = *iterator;
if (pc.type == "add" || pc.type == "sub" || pc.type == "mult" || pc.type == "div") {
// 出现非单的情况
if (pc.dst == pc.op1 || pc.dst == pc.op2) {
if (is_temp_var(pc.dst) && temp_sym_const[pc.op1] && temp_sym_const[pc.op2] && o1) {
if (pc.type == "add") push_const(pc.dst, temp_sym_focus[pc.op1] + temp_sym_focus[pc.op2]);
else if (pc.type == "sub") push_const(pc.dst, temp_sym_focus[pc.op1] - temp_sym_focus[pc.op2]);
else if (pc.type == "mult") push_const(pc.dst, temp_sym_focus[pc.op1] * temp_sym_focus[pc.op2]);
else if (pc.type == "div") push_const(pc.dst, temp_sym_focus[pc.op1] / temp_sym_focus[pc.op2]);
}
}
else if (temp_sym_const[pc.op1] && temp_sym_const[pc.op2] && o1 && is_temp_var(pc.dst)) {
if (pc.type == "add") push_const(pc.dst, temp_sym_focus[pc.op1] + temp_sym_focus[pc.op2]);
else if (pc.type == "sub") push_const(pc.dst, temp_sym_focus[pc.op1] - temp_sym_focus[pc.op2]);
else if (pc.type == "mult") push_const(pc.dst, temp_sym_focus[pc.op1] * temp_sym_focus[pc.op2]);
else if (pc.type == "div") push_const(pc.dst, temp_sym_focus[pc.op1] / temp_sym_focus[pc.op2]);
}
else if (temp_sym_tab.find(pc.dst) != temp_sym_tab.end());
else push_tab(pc.dst, 4, is_glob);
}
else if (pc.type == "multi_rep" ) {
if (temp_sym_const[pc.op1] && o1) {
push_const(pc.dst, str2int(pc.op2) * temp_sym_focus[pc.op1]);
}
else push_tab(pc.dst, 4, is_glob);
}
else if (pc.type == "neg") {
if (temp_sym_const[pc.op1] && o1) {
push_const(pc.dst, -temp_sym_focus[pc.op1]);
}
else push_tab(pc.dst, 4, is_glob);
}
else if (pc.type == "li") {
push_const(pc.dst, str2int(pc.op1));
}
else if (pc.type == "allocate"
|| pc.type == "allocate_init" || pc.type == "var") {
int size = str2int(pc.op2);
push_tab(pc.op1, size, is_glob);
} else if (pc.type == "set_function_flag") {
is_glob = false;
if (cur_func_name != "") push_func(cur_func_name);
cur_func_name = pc.dst;
temp_sym_tab[pc.dst + "_$ra"] = 0;
temp_sym_glob[pc.dst + "_$ra"] = false;
top_index = 0;
} else if (pc.type == "lod") {
if (!start_with(pc.op1, "@")) push_tab(pc.dst, 4, is_glob);
else push_quot(pc.dst, pc.op1, is_glob);
} else if (pc.type == "lod_off" || pc.type == "para") {
push_tab(pc.dst, 4, is_glob);
} else if (pc.type == "call") {
if (pc.op1 != "@None") push_tab(pc.op1, 4, is_glob);
} else if (pc.type == "assign") {
if (temp_sym_tab.find(pc.dst) == temp_sym_tab.end() && is_temp_var(pc.dst)) {
if (temp_sym_const[pc.op1]) push_const(pc.dst, temp_sym_focus[pc.op1]);
else push_tab(pc.dst, 4, is_glob);
}
}
}
push_func("main");
}
string data_base = "$a3";
void qcodes2mips() {
set_temp_sym_tab();
list<Quardcode>::const_iterator iterator;
bool no_func = true;
set_data_seg();
allocate(random_key + "_reserved_data_base", "4");
for (iterator = qcodes.cbegin(); iterator != qcodes.cend(); iterator++) {
Quardcode pc = *iterator;
flush_reservation();
mout << "# " + pc.to_string() << endl;
if (pc.type == "add" || pc.type == "sub" || pc.type == "mult" || pc.type == "div"
|| pc.type == "multi_rep") {
current_top += 4;
if (pc.type == "multi_rep") {
int addr = temp_sym_tab[pc.op1];
string base_reg = "$sp";
string reg_name_dst;
if (temp_sym_glob[pc.op1]) base_reg = data_base;
int addr1 = temp_sym_tab[pc.dst];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg = data_base;
if (temp_sym_const[pc.op1] && o1) {
if (temp_sym_const[pc.dst]);
else {
reg_name_dst = "$t0";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
li(reg_name_dst, to_string(temp_sym_focus[pc.op1] * str2int(pc.op2)));
if (!o3) sw(reg_name_dst, temp_sym_tab[pc.dst], base_reg);
}
}
else {
string reg_name0;
string reg_name1;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else lw(reg_name0, addr, base_reg);
int con = str2int(pc.op2);
reg_name_dst = "$t2";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
if (o1 && get_log(con) > 0) {
if (con < 0) {
neg("$a2", reg_name0);
sll(reg_name_dst, "$a2", to_string(get_log(con)));
}
else sll(reg_name_dst, reg_name0, to_string(get_log(con)));
}
else if (pc.op2 != "1" || !o1) {
reg_name1 = "$t1";
if (o3) {
reg_name1 = read_allocate_reg("##TEMP##");
li(reg_name1, pc.op2);
}
else li(reg_name1, pc.op2);
mult(reg_name0, reg_name1);
mflo(reg_name_dst);
} else {
mv(reg_name_dst, reg_name0);
}
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
}
else if (!temp_sym_const[pc.op2] && !temp_sym_const[pc.op1]) {
int addr1 = temp_sym_tab[pc.dst];
int addr2 = temp_sym_tab[pc.op1];
int addr3 = temp_sym_tab[pc.op2];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
string base_reg2 = "$sp";
if (temp_sym_glob[pc.op1]) base_reg2 = data_base;
string base_reg3 = "$sp";
if (temp_sym_glob[pc.op2]) base_reg3 = data_base;
string reg_name0;
string reg_name1;
string reg_name_dst;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else lw(reg_name0, addr2, base_reg2);
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op2);
else lw(reg_name1, addr3, base_reg3);
reg_name_dst = "$t2";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
if (pc.type == "add") {
add(reg_name_dst, reg_name0, reg_name1);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
} else if (pc.type == "sub") {
sub(reg_name_dst, reg_name0, reg_name1);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
} else if (pc.type == "mult") {
mult(reg_name0, reg_name1);
mflo(reg_name_dst);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
} else if (pc.type == "div") {
div(reg_name0, reg_name1);
mflo(reg_name_dst);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
}
else if (!temp_sym_const[pc.op1]){
int addr1 = temp_sym_tab[pc.dst];
int addr2 = temp_sym_tab[pc.op1];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
string base_reg2 = "$sp";
if (temp_sym_glob[pc.op1]) base_reg2 = data_base;
string reg_name0;
string reg_name1;
string reg_name_dst;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else lw(reg_name0, addr2, base_reg2);
reg_name_dst = "$t2";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
if (pc.type == "add") {
if (temp_sym_focus[pc.op2] == 0 && o1) {
mv(reg_name_dst, reg_name0);
if (!o3) sw(reg_name0, addr1, base_reg1);
}
else {
addi(reg_name_dst, reg_name0, to_string(temp_sym_focus[pc.op2]));
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
} else if (pc.type == "sub") {
if (temp_sym_focus[pc.op2] == 0 && o1) {
mv(reg_name_dst, reg_name0);
if (!o3) sw(reg_name0, addr1, base_reg1);
}
else {
subi(reg_name_dst, reg_name0, to_string(temp_sym_focus[pc.op2]));
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
} else if (pc.type == "mult") {
if (temp_sym_focus[pc.op2] == 1 && o1) {
mv(reg_name_dst, reg_name0);
if (!o3) sw(reg_name0, addr1, base_reg1);
}
else if (o1 && get_log(temp_sym_focus[pc.op2]) > 0) {
if (temp_sym_focus[pc.op2] < 0) {
neg("$a2", reg_name0);
sll(reg_name_dst, "$a2", to_string(get_log(temp_sym_focus[pc.op2])));
}
else sll(reg_name_dst, reg_name0, to_string(get_log(temp_sym_focus[pc.op2])));
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
else {
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op2);
else li(reg_name1, to_string(temp_sym_focus[pc.op2]));
mult(reg_name0, reg_name1);
mflo(reg_name_dst);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
} else if (pc.type == "div") {
if (temp_sym_focus[pc.op2] == 1 && o1) {
mv(reg_name_dst, reg_name0);
if (!o3) sw(reg_name0, addr1, base_reg1);
}
else if (o1 && get_log(temp_sym_focus[pc.op2]) > 0) {
if (temp_sym_focus[pc.op2] < 0) {
neg("$a2", reg_name0);
sra(reg_name_dst, "$a2", to_string(get_log(temp_sym_focus[pc.op2])));
}
else sra(reg_name_dst, reg_name0, to_string(get_log(temp_sym_focus[pc.op2])));
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
else {
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op2);
else li(reg_name1, to_string(temp_sym_focus[pc.op2]));
div(reg_name0, reg_name1);
mflo(reg_name_dst);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
}
}
else if (!temp_sym_const[pc.op2]) {
int addr1 = temp_sym_tab[pc.dst];
int addr2 = temp_sym_tab[pc.op2];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
string base_reg2 = "$sp";
if (temp_sym_glob[pc.op2]) base_reg2 = data_base;
string reg_name0;
string reg_name1;
string reg_name_dst;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op2);
else lw(reg_name0, addr2, base_reg2);
reg_name_dst = "$t2";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
if (pc.type == "add") {
if (temp_sym_focus[pc.op1] == 0 && o1) {
mv(reg_name_dst, reg_name0);
if (!o3) sw(reg_name0, addr1, base_reg1);
}
else {
addi(reg_name_dst, reg_name0, to_string(temp_sym_focus[pc.op1]));
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
} else if (pc.type == "sub") {
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op1);
else li(reg_name1, to_string(temp_sym_focus[pc.op1]));
sub(reg_name_dst, reg_name1, reg_name0);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
} else if (pc.type == "mult") {
if (temp_sym_focus[pc.op1] == 1 && o1) {
mv(reg_name_dst, reg_name0);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
else if (o1 && get_log(temp_sym_focus[pc.op1]) > 0) {
if (temp_sym_focus[pc.op1] < 0) {
neg("$a2", reg_name0);
sll(reg_name_dst, "$a2", to_string(get_log(temp_sym_focus[pc.op1])));
}
else sll(reg_name_dst, reg_name0, to_string(get_log(temp_sym_focus[pc.op1])));
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
else {
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op1);
else li(reg_name1, to_string(temp_sym_focus[pc.op1]));
mult(reg_name0, reg_name1);
mflo(reg_name_dst);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
} else if (pc.type == "div") {
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op1);
else li(reg_name1, to_string(temp_sym_focus[pc.op1]));
div(reg_name1,reg_name0);
mflo(reg_name_dst);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
}
else if (o1) {
string reg_name_dst;
if (temp_sym_const[pc.dst]);
else {
reg_name_dst = "$t0";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
string base_reg = "$sp";
if (temp_sym_glob[pc.dst]) base_reg = data_base;
if (pc.type == "add") li(reg_name_dst, to_string(temp_sym_focus[pc.op1] + temp_sym_focus[pc.op2]));
else if (pc.type == "sub") li(reg_name_dst, to_string(temp_sym_focus[pc.op1] - temp_sym_focus[pc.op2]));
else if (pc.type == "mult") li(reg_name_dst, to_string(temp_sym_focus[pc.op1] * temp_sym_focus[pc.op2]));
else if (pc.type == "div") li(reg_name_dst, to_string(temp_sym_focus[pc.op1] / temp_sym_focus[pc.op2]));
if (!o3) sw(reg_name_dst, temp_sym_tab[pc.dst], base_reg);
}
}
else {
int addr1 = temp_sym_tab[pc.dst];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
li("$t0", to_string(temp_sym_focus[pc.op1]));
if (pc.type == "add") {
addi("$t2", "$t0", to_string(temp_sym_focus[pc.op2]));
if (!o3) sw("$t2", addr1, base_reg1);
} else if (pc.type == "sub") {
subi("$t2", "$t0", to_string(temp_sym_focus[pc.op2]));
if (!o3) sw("$t2", addr1, base_reg1);
} else if (pc.type == "mult") {
li("$t1", to_string(temp_sym_focus[pc.op2]));
mult("$t0", "$t1");
mflo("$t0");
if (!o3) sw("$t0", addr1, base_reg1);
} else if (pc.type == "div") {
li("$t1", to_string(temp_sym_focus[pc.op2]));
div("$t0", "$t1");
mflo("$t0");
if (!o3) sw("$t0", addr1, base_reg1);
}
}
}
else if (pc.type == "neg") {
int addr1 = temp_sym_tab[pc.dst];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
int addr2 = temp_sym_tab[pc.op1];
string base_reg2 = "$sp";
if (temp_sym_glob[pc.op1]) base_reg2 = data_base;
string reg_name0;
string reg_name1;
string reg_name_dst;
if (temp_sym_const[pc.op1] && o1) ;
else {
if (temp_sym_const[pc.op1]) {
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else li(reg_name0, to_string(temp_sym_focus[pc.op1]));
}
else {
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else lw(reg_name0, addr2, base_reg2);
}
reg_name_dst = "$t1";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
neg(reg_name_dst, reg_name0);
if (!o3) sw(reg_name_dst, addr1, base_reg1);
}
}
else if (pc.type == "lod") {
string reg_name0;
string reg_name_dst;
if (!temp_sym_const[pc.op1]) {
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else if (temp_sym_const[pc.op1]) li(reg_name0, to_string(temp_sym_focus[pc.op1]));
else lw(reg_name0, temp_sym_tab[pc.op1], data_base);
reg_name_dst = "$t1";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
string base_reg = "$sp";
mv(reg_name_dst, reg_name0);
if (temp_sym_glob[pc.dst]) base_reg = data_base;
if (pc.op1 != "std::endl") if (!o3) sw(reg_name0, temp_sym_tab[pc.dst], base_reg);
}
}
else if (pc.type == "lod_off") {
current_top += 4;
int dst_addr = temp_sym_tab[pc.dst];
int src_addr = temp_sym_tab[pc.op1];
int off_addr = temp_sym_tab[pc.op2];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
string base_reg2 = "$sp";
if (temp_sym_glob[pc.op1]) base_reg2 = data_base;
string base_reg3 = "$sp";
if (temp_sym_glob[pc.op2]) base_reg3 = data_base;
string reg_name0;
string reg_name_dst;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op2);
else if (temp_sym_const[pc.op2]) li(reg_name0, to_string(temp_sym_focus[pc.op2]));
else lw(reg_name0, off_addr, base_reg3);
addi("$a2", reg_name0, to_string(src_addr));
reg_name_dst = "$t1";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
lw(reg_name_dst, "$a2", base_reg2);
if (!o3) sw(reg_name_dst, dst_addr, base_reg1);
}
else if (pc.type == "allocate") {
current_top += str2int(pc.op2);
allocate(pc.op1, pc.op2);
}
else if (pc.type == "allocate_init") {
current_top += str2int(pc.op2);
allocate_init(pc.dst, pc.op1, pc.arr);
}
else if (pc.type == "initialize_a") {
int base_addr = temp_sym_tab[pc.dst];
for (int i = 0;i < pc.arr.size();i++) {
li("$a2", to_string(pc.arr[i]));
sw("$a2", (base_addr+4*i), "$sp");
}
}
else if (pc.type == "li") {
;
}
else if (pc.type == "const") {
;
}
else if (pc.type == "var" || pc.type == "para") {
current_top += str2int(pc.op2);
}
else if (pc.type == "print_s") {
la("$a0", random_key + "string_" + to_string(s_count));
s_count++;
li("$v0", "4");
syscall();
}
else if (pc.type == "print_v_int") {
int dst_addr = temp_sym_tab[pc.dst];
string base_reg = "$sp";
if (temp_sym_glob[pc.dst]) base_reg = "$a3";
if (o3 && get_allocated_reg(pc.dst) != "") {
mv("$a0", get_allocated_reg(pc.dst));
}
else if (temp_sym_const[pc.dst]) {
li("$a0", to_string(temp_sym_focus[pc.dst]));
}
else lw("$a0", dst_addr, base_reg);
li("$v0", "1");
syscall();
}
else if (pc.type == "print_v_char") {
int dst_addr = temp_sym_tab[pc.dst];
string base_reg = "$sp";
if (temp_sym_glob[pc.dst]) base_reg = "$a3";
if (o3 && get_allocated_reg(pc.dst) != "") {
mv("$a0", get_allocated_reg(pc.dst));
}
else if (temp_sym_const[pc.dst]) {
li("$a0", to_string(temp_sym_focus[pc.dst]));
}
else lw("$a0", dst_addr, base_reg);
li("$v0", "11");
syscall();
}
else if (pc.type == "print_endl") {
li("$a0", "10");
li("$v0", "11");
syscall();
}
else if (pc.type == "scanf_int") {
int dst_addr = temp_sym_tab[pc.dst];
string base_reg = "$sp";
if (temp_sym_glob[pc.dst]) base_reg = data_base;
li("$v0", "5");
syscall();
if (!o3) sw("$v0", dst_addr, base_reg);
else {
string reg_name_dst = write_allocate_reg(pc.dst);
mv(reg_name_dst, "$v0");
}
}
else if (pc.type == "scanf_char") {
int dst_addr = temp_sym_tab[pc.dst];
string base_reg = "$sp";
if (temp_sym_glob[pc.dst]) base_reg = data_base;
li("$v0", "12");
syscall();
if (!o3) sw("$v0", dst_addr, base_reg);
else {
string reg_name_dst = write_allocate_reg(pc.dst);
mv(reg_name_dst, "$v0");
}
}
else if (pc.type == "set_function_flag") {
cur_func_name = pc.dst;
current_top = 0;
if (no_func) {
set_string();
set_text_seg();
li("$a3", "0x10010000");
subi("$sp", "$sp", to_string(temp_func_tab["main"]));
j("main");
no_func = false;
}
set_flag(pc.dst);
sw("$ra", 0, "$sp");
}
else if (pc.type == "assign") {
int dst_addr = temp_sym_tab[pc.dst];
int src_addr = temp_sym_tab[pc.op1];
string base_reg2 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg2 = data_base;
string base_reg1 = "$sp";
if (temp_sym_glob[pc.op1]) base_reg1 = data_base;
string reg_name0;
string reg_name_dst;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else if (temp_sym_const[pc.op1]) li(reg_name0, to_string(temp_sym_focus[pc.op1]));
else lw(reg_name0, src_addr, base_reg1);
reg_name_dst = "$t1";
if (o3) reg_name_dst = write_allocate_reg(pc.dst);
mv(reg_name_dst, reg_name0);
if (!o3) sw(reg_name_dst, dst_addr, base_reg2);
}
else if (pc.type == "assign_off") {
int dst_addr = temp_sym_tab[pc.dst];
int src_addr = temp_sym_tab[pc.op1];
int off_addr = temp_sym_tab[pc.op2];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
string base_reg2 = "$sp";
if (temp_sym_glob[pc.op1]) base_reg2 = data_base;
string base_reg3 = "$sp";
if (temp_sym_glob[pc.op2]) base_reg3 = data_base;
string reg_name0; // offset
string reg_name1; // value
string reg_name_dst;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.op2);
else if (temp_sym_const[pc.op2]) li(reg_name0, to_string(temp_sym_focus[pc.op2]));
else lw(reg_name0, off_addr, base_reg3);
addi("$a2", reg_name0, to_string(dst_addr));
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op1);
else if (temp_sym_const[pc.op1]) li(reg_name1, to_string(temp_sym_focus[pc.op1]));
else lw(reg_name1, src_addr, base_reg2);
reg_name_dst = "$t2";
if (o3) reg_name_dst = "$a1";
mv(reg_name_dst, reg_name1);
sw(reg_name_dst, "$a2", base_reg1);
}
else if (pc.type == "set_label") {
set_flag(pc.type + "_" + pc.dst);
}
else if (pc.type == "beq" || pc.type == "bne" || pc.type == "ble" ||
pc.type == "blt" || pc.type == "bge" || pc.type == "bgt") {
int addr1 = temp_sym_tab[pc.op1];
int addr2 = temp_sym_tab[pc.op2];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.op1]) base_reg1 = data_base;
string base_reg2 = "$sp";
if (temp_sym_glob[pc.op2]) base_reg2 = data_base;
string reg_name0;
string reg_name1;
reg_name0 = "$t0";
if (pc.op1 == "@main_t7") {
int aaaa = 1;
}
if (o3) reg_name0 = allocate_reg_and_load(pc.op1);
else if (temp_sym_const[pc.op1]) li(reg_name0, to_string(temp_sym_focus[pc.op1]));
else lw(reg_name0, addr1, base_reg1);
if (pc.type == "bne" && !temp_sym_const[pc.op1]) sw(reg_name0, addr1, base_reg1);
if (temp_sym_const[pc.op2]) {
branch(pc.type, reg_name0, to_string(temp_sym_focus[pc.op2]), pc.dst);
continue;
}
else {
reg_name1 = "$t1";
if (o3) reg_name1 = allocate_reg_and_load(pc.op2);
else lw("$t1", addr2, base_reg2);
}
branch(pc.type, reg_name0, reg_name1, pc.dst);
}
else if (pc.type == "jump") {
j(pc.dst);
}
else if (pc.type == "set_post_process") {
int addr1 = temp_sym_tab[pc.dst];
string base_reg1 = "$sp";
if (temp_sym_glob[pc.dst]) base_reg1 = data_base;
string reg_name0;
reg_name0 = "$t0";
if (o3) reg_name0 = allocate_reg_and_load(pc.dst);
else lw(reg_name0, addr1, base_reg1);
if (pc.op1 == "0") addi(reg_name0,reg_name0, pc.op2);
else subi(reg_name0, reg_name0, pc.op2);
if (!o3) sw(reg_name0, addr1, base_reg1);
}
else if (pc.type == "call") {
over_flow_index = 0;
save_spot();
subi("$sp", "$sp", to_string(temp_func_tab[pc.dst] + 4));
jal(pc.dst);
int addr1 = temp_sym_tab[pc.op1];
lw("$ra", 0, "$sp");
if (pc.op1 != "@None") sw("$v0", addr1, "$sp");
}
else if (pc.type == "push") {
over_flow_index += 4;
string reg_name0;
reg_name0 = "$t0";
if (pc.dst == "@main_t60sub5") {
int aaaa = 1;
}
if (o3) reg_name0 = allocate_reg_and_load(pc.dst);
else if (temp_sym_const[pc.dst]) li(reg_name0, to_string(temp_sym_focus[pc.dst]));
else if (temp_sym_glob[pc.dst]) lw(reg_name0, temp_sym_tab[pc.dst], data_base);
else lw(reg_name0, temp_sym_tab[pc.dst], "$sp");
sw(reg_name0, over_flow_index - down_move_length - 4, "$sp");
}
else if (pc.type == "return") {
// set RETURN_VAL
if (pc.dst == "@None") ;
else if (o3 && get_allocated_reg(pc.dst) != "") mv("$v0", get_allocated_reg(pc.dst));
else if (temp_sym_const[pc.dst]) li("$v0", to_string(temp_sym_focus[pc.dst]));
else if (temp_sym_glob[pc.dst]) lw("$v0", temp_sym_tab[pc.dst], data_base);
else lw("$v0", temp_sym_tab[pc.dst], "$sp");
// set stack
addi("$sp", "$sp", to_string(temp_func_tab[cur_func_name] + 4));
jr("$ra");
}
else if (pc.type == "shut down") {
li("$v0", "10");
syscall();
}
else if (pc.type == "set_down_move") {
down_move_length = temp_func_tab[pc.dst];
}
else if (pc.type == "clear_all") {
clear_all();
}
else if (pc.type == "block_end") {
write_back_all_t();
}
else {
cout << pc.to_string() << endl;
cout << "#####FATAL ERROR#####";
}
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// register pool
/*
* 使用寄存器流程：
* 1、程序初始时，要初始化：init_reg_pool()
* 2、现有一个变量var要加载到寄存器中：
* if (o) {
* bool in_reg = true;
* string reg_name = get_allocated_reg(var);
* if (reg_name.size() == 0) {
* in_reg = false;
* reg_name = read_allocate_reg(name);
* /////////////////
* ///lw，li操作/////
* /////////////////
* }
* } else {
* /////////////////
* ///lw，li操作/////
* /////////////////
* }
* 3、回写策略
* 该寄存器被换走，或者函数调用
*/
static string s_regs[8];
static int s_pointer = 0;
static bool s_reserved[8];
static string t_regs[10];
static int t_pointer = 0;
static bool t_reserved[10];
static bool t_use[10];
bool is_temp_var(const string& name) {
int count = 0;
for (char i : name) {
if (i == '@') count++;
}
return count == 1;
}
void init_reg_pool() {
for (int i = 0;i < 8;i++) {
s_regs[i] = "";
s_reserved[i] = false;
}
for (int i = 0;i < 10;i++) {
t_regs[i] = "";
t_reserved[i] = false;
t_use[i] = false;
}
}
string get_allocated_reg(const string& name) {
int i;
for (i = 0;i < 8;i++) {
if (s_regs[i] == name) {
string ans = "$s" + to_string(i);
s_reserved[i] = true;
return ans;
}
}
for (i = 0;i < 10;i++) {
if (t_regs[i] == name) {
string ans = "$t" + to_string(i);
t_reserved[i] = true;
return ans;
}
}
return "";
}
void write_back_all_t() {
for (t_pointer = 0;t_pointer < 10;t_pointer++) {
if ((t_regs[t_pointer] != "" && !is_temp_var(t_regs[t_pointer])) || (!t_use[t_pointer] && t_regs[t_pointer] != "")) {
string write_back_var = t_regs[t_pointer];
string reg_name = "$t" + to_string(t_pointer);
string base_reg = "$sp";
if (temp_sym_glob[write_back_var]) base_reg = data_base;
if (temp_sym_tab[write_back_var] != 0) {
sw(reg_name, temp_sym_tab[write_back_var], base_reg);
}
}
}
t_pointer = 0;
}
void write_back_all_t1() {
for (t_pointer = 0;t_pointer < 10;t_pointer++) {
if (t_regs[t_pointer] != "" && !is_temp_var(t_regs[t_pointer])) {
string write_back_var = t_regs[t_pointer];
string reg_name = "$t" + to_string(t_pointer);
string base_reg = "$sp";
if (temp_sym_glob[write_back_var]) base_reg = data_base;
if (temp_sym_tab[write_back_var] != 0) {
sw(reg_name, temp_sym_tab[write_back_var], base_reg);
}
}
}
t_pointer = 0;
}
void write_back_all_s() {
for (s_pointer = 0;s_pointer < 8;s_pointer++) {
if (!s_regs[s_pointer].empty()) {
string write_back_var = s_regs[s_pointer];
string reg_name = "$s" + to_string(s_pointer);
string base_reg = "$sp";
if (temp_sym_glob[write_back_var]) base_reg = data_base;
if (!o3) sw(reg_name, temp_sym_tab[reg_name], base_reg);
}
}
}
string read_allocate_reg(const string& name, bool for_write) {
string ans;
while (t_reserved[t_pointer]) {
t_pointer = (t_pointer + 1) % 10;
}
if (t_regs[t_pointer] != "" && (!t_use[t_pointer] || !is_temp_var(t_regs[t_pointer])) && temp_sym_tab[t_regs[t_pointer]] != 0) {
string write_back_var = t_regs[t_pointer];
string reg_name = "$t" + to_string(t_pointer);
string base_reg = "$sp";
string out_var = t_regs[t_pointer];
if (temp_sym_glob[write_back_var]) base_reg = data_base;
if (temp_sym_tab.find(out_var) != temp_sym_tab.end())
sw(reg_name, temp_sym_tab[out_var], base_reg);
}
if (name != "##TEMP##") t_regs[t_pointer] = name;
else t_regs[t_pointer] = "";
t_reserved[t_pointer] = true;
ans = "$t" + to_string(t_pointer);
if (for_write) t_use[t_pointer] = false;
else t_use[t_pointer] = true;
t_pointer = (t_pointer + 1) % 10;
return ans;
}
string write_allocate_reg(const string& name, bool replace) {
string ans;
for (int i = 0;i < 10;i++) {
if (t_regs[i] == name) {
t_use[i] = true;
return "$t" + to_string(i);
}
}
if (replace) {
for (int i = 0;i < 10;i++) {
if (t_reserved[i]) {
t_use[i] = true;
return "$t" + to_string(i);
}
}
}
return read_allocate_reg(name, true);
}
void flush_reservation() {
for (bool & i : s_reserved) {
i = false;
}
for (bool & i : t_reserved) {
i = false;
}
}
string allocate_reg_and_load(const string& var_name) {