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package main
import (
"fmt"
"regexp"
"strconv"
"os"
)
var print = fmt.Println
func readfile(path string) []string {
var raw []string;
reg := regexp.MustCompile(`\s`)
dat, err := os.ReadFile(path);
if (err != nil) {
panic("failed to read file");
}
tmp := reg.Split(string(dat), -1);
/* TODO: add comments */
for i := range tmp {
if tmp[i] != "" {
raw = append(raw, tmp[i]);
}
};
return raw;
}
func parseString(raw[] string, i int) (str string, strLen int, endIndex int) {
str = ""
for ;; i++ {
word := raw[i]
strLen += len(word)
str += word
if word[len(word) - 1] == '"' {
break;
}
str += " "
strLen++
}
return str, strLen, i
}
func compile(raw[]string) {
var iflabels[] int
var looplabels[] int
var strings[][2] string
print("section .text")
print("global _start")
print("_start:")
for i := 0; i < len(raw); i++ {
number, err := strconv.Atoi(raw[i]);
if err == nil {
print(" ;; PUSHING TO STACK")
print(" push", number)
continue;
}
switch raw[i] {
case "+":
print(" ;; PLUS")
print(" pop rsi")
print(" pop rax")
print(" add rax, rsi")
print(" push rax")
case "-":
print(" ;; MINUS")
print(" pop rsi")
print(" pop rax")
print(" sub rax, rsi")
print(" push rax")
case ">":
print(" ;; GREATER")
print(" mov r10, 0")
print(" mov r11, 1")
print(" pop rsi")
print(" pop rax")
print(" cmp rax, rsi")
print(" cmovg r10, r11")
print(" push r10")
case "<":
print(" ;; LESS")
print(" mov r10, 0")
print(" mov r11, 1")
print(" pop rsi")
print(" pop rax")
print(" cmp rax, rsi")
print(" cmovl r10, r11")
print(" push r10")
case "=":
print(" ;; EQUAL")
print(" mov r10, 0")
print(" mov r11, 1")
print(" pop rsi")
print(" pop rax")
print(" cmp rax, rsi")
print(" cmove r10, r11")
print(" push r10")
case ".":
print(" ;; DUMP")
print(" pop rdi")
print(" call .dump")
case "dup":
print(" ;; DUPLICATE")
print(" pop r10")
print(" push r10")
print(" push r10")
case "if":
print(" ;; IF")
print(" pop r10")
print(" cmp r10, 0")
fmt.Printf(" je .if%d\n", i)
iflabels = append(iflabels, i)
case "else":
print(" ;; ELSE")
fmt.Printf(" jmp .if%d\n", i)
fmt.Printf(".if%d:\n", iflabels[len(iflabels) - 1])
iflabels = iflabels[:len(iflabels) - 1]
iflabels = append(iflabels, i)
case "endif":
print(" ;; ENDIF")
fmt.Printf(".if%d:\n", iflabels[len(iflabels) - 1])
iflabels = iflabels[:len(iflabels) - 1]
case "while":
print(" ;; WHILE")
fmt.Printf(".loop%d:\n", i);
looplabels = append(looplabels, i)
case "do":
print(" ;; DO")
print(" pop r10")
print(" cmp r10, 0")
fmt.Printf(" je .endloop%d\n", looplabels[len(looplabels) - 1])
case "endloop":
print(" ;; ENDLOOP")
fmt.Printf(" jmp .loop%d\n", looplabels[len(looplabels) - 1])
fmt.Printf(".endloop%d:\n", looplabels[len(looplabels) - 1])
looplabels = looplabels[:len(looplabels) - 1]
case "pushstr":
str, strLen, lastIndex := parseString(raw, i + 1)
print(" ;; PUSHING STRING LENGTH")
fmt.Printf(" push %d\n", strLen)
print(" ;; PUSHING STRING")
fmt.Printf(" push string_%d\n", i);
tmp := [2]string{str, fmt.Sprintf("string_%d", i)}
strings = append(strings, tmp)
i = lastIndex;
/* Functions */
case "exit":
print(" ;; EXIT")
print(" pop rdi")
print(" mov rax, 60")
print(" syscall")
case "println":
print(" ;; PRINTLN")
print(" pop rsi")
print(" pop rdx")
print(" mov rdi, 1")
print(" mov rax, 1")
print(" syscall")
default:
panic("invalid word")
}
}
print(" ;; EXIT")
print(" mov rdi, 0")
print(" mov rax, 60")
print(" syscall")
print(".dump:");
print(" push rbp")
print(" mov rbp, rsp")
print(" sub rsp, 48")
print(" mov DWORD [rbp-36], edi")
print(" mov QWORD [rbp-32], 0")
print(" mov QWORD [rbp-24], 0")
print(" mov DWORD [rbp-16], 0")
print(" mov BYTE [rbp-13], 10")
print(" mov DWORD [rbp-4], 18")
print(" mov DWORD [rbp-8], 0")
print(" cmp DWORD [rbp-36], 0")
print(" jns .L3")
print(" neg DWORD [rbp-36]")
print(" mov DWORD [rbp-8], 1")
print(".L3:")
print(" mov edx, DWORD [rbp-36]")
print(" movsx rax, edx")
print(" imul rax, rax, 1717986919")
print(" shr rax, 32")
print(" mov ecx, eax")
print(" sar ecx, 2")
print(" mov eax, edx")
print(" sar eax, 31")
print(" sub ecx, eax")
print(" mov eax, ecx")
print(" sal eax, 2")
print(" add eax, ecx")
print(" add eax, eax")
print(" sub edx, eax")
print(" mov DWORD [rbp-12], edx")
print(" mov eax, DWORD [rbp-12]")
print(" add eax, 48")
print(" mov edx, eax")
print(" mov eax, DWORD [rbp-4]")
print(" cdqe")
print(" mov BYTE [rbp-32+rax], dl")
print(" mov eax, DWORD [rbp-12]")
print(" sub DWORD [rbp-36], eax")
print(" mov eax, DWORD [rbp-36]")
print(" movsx rdx, eax")
print(" imul rdx, rdx, 1717986919")
print(" shr rdx, 32")
print(" mov ecx, edx")
print(" sar ecx, 2")
print(" cdq")
print(" mov eax, ecx")
print(" sub eax, edx")
print(" mov DWORD [rbp-36], eax")
print(" sub DWORD [rbp-4], 1")
print(" cmp DWORD [rbp-36], 0")
print(" jne .L3")
print(" cmp DWORD [rbp-8], 0")
print(" je .L4")
print(" mov eax, DWORD [rbp-4]")
print(" cdqe")
print(" mov BYTE [rbp-32+rax], 45")
print(" sub DWORD [rbp-4], 1")
print(".L4:")
print(" mov eax, 20")
print(" sub eax, DWORD [rbp-4]")
print(" cdqe")
print(" mov edx, DWORD [rbp-4]")
print(" movsx rdx, edx")
print(" lea rcx, [rbp-32]")
print(" add rcx, rdx")
print(" mov rdx, rax")
print(" mov rsi, rcx")
print(" mov edi, 1")
print(" mov rax, 1")
print(" syscall")
print(" nop")
print(" leave")
print(" ret")
print("section .data")
for i := 0; i < len(strings); i++ {
fmt.Printf("%s: db %s, 10\n", strings[i][1], strings[i][0])
}
print("")
}
func main() {
argv := os.Args;
argc := len(argv);
if (argc != 2) {
panic("Invaid usage");
}
raw := readfile(argv[argc - 1])
compile(raw);
}
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