withmachinecode

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

// Token types
typedef enum { TOKEN_NUMBER, TOKEN_PLUS, TOKEN_MINUS, TOKEN_MUL, TOKEN_DIV, TOKEN_EOF } TokenType;

// Token structure
typedef struct {
    TokenType type;
    int value;  // Only used for numbers
} Token;

const char *input;
Token current_token;

// Function to get the next token
Token get_next_token() {
    while (*input) {
        if (isspace(*input)) {
            input++;
            continue;
        }
        if (isdigit(*input)) {
            int val = strtol(input, (char **)&input, 10);
            return (Token){TOKEN_NUMBER, val};
        }
        switch (*input) {
            case '+': input++; return (Token){TOKEN_PLUS, 0};
            case '-': input++; return (Token){TOKEN_MINUS, 0};
            case '*': input++; return (Token){TOKEN_MUL, 0};
            case '/': input++; return (Token){TOKEN_DIV, 0};
        }
        fprintf(stderr, "Unexpected character: %c\n", *input);
        exit(1);
    }
    return (Token){TOKEN_EOF, 0};
}

// Stack-based x64 assembly code generation
void expr() {
    int stack_top = 0;
    current_token = get_next_token();
    while (current_token.type != TOKEN_EOF) {
        if (current_token.type == TOKEN_NUMBER) {
            printf("    mov rax, %d\n", current_token.value);
            printf("    push rax\n");
            stack_top++;
        } else if (current_token.type == TOKEN_PLUS) {
            stack_top--;
            printf("    pop rbx\n");
            printf("    pop rax\n");
            printf("    add rax, rbx\n");
            printf("    push rax\n");
        } else if (current_token.type == TOKEN_MINUS) {
            stack_top--;
            printf("    pop rbx\n");
            printf("    pop rax\n");
            printf("    sub rax, rbx\n");
            printf("    push rax\n");
        } else if (current_token.type == TOKEN_MUL) {
            stack_top--;
            printf("    pop rbx\n");
            printf("    pop rax\n");
            printf("    imul rax, rbx\n");
            printf("    push rax\n");
        } else if (current_token.type == TOKEN_DIV) {
            stack_top--;
            printf("    pop rbx\n");
            printf("    pop rax\n");
            printf("    cqo\n");
            printf("    idiv rbx\n");
            printf("    push rax\n");
        }
        current_token = get_next_token();
    }
    printf("    pop rax\n");
    printf("    mov rdi, rax\n");
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <expression>\n", argv[0]);
        return 1;
    }
    input = argv[1];
    printf(".section .text\n.global _start\n_start:\n");
    expr();
    printf("    mov rax, 60\n");
    printf("    syscall\n");
    return 0;
}