#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#pragma clang diagnostic ignored "-Wreturn-type"
#pragma clang diagnostic ignored "-Wc23-extensions"

#define S 65536
#define H !--c?
m[S],c,a;pu(){while((c=m[m[7]++]))H*m=m[m[7]++]:c--<9?a?m[c]=*m:0:8>(c-=8)?*m=m[c]:!(c-=8)?m[m[1]]=*m:H*m=a:H a+=*m:H a-=*m:H a=!a:H a=0:0;}

// a is acc
// first 8 memory bytes are registers actually
// c is pc, read from m[7]

// --- opcodes ---
// 0 = halt DONE
// 1 = const in r0 DONE
// 2...9 = r0 in rX (only if acc is non-zero) DONE
// 10...17 = rX in r0 DONE
// 18 = r0 in m[r1] DONE
// 19 = acc in r0 DONE
// 20 = acc += r0 DONE
// 21 = acc -= r0 DONE
// 22 = acc = !acc DONE
// 23 = acc = 0 DONE
// for ops 2..9 and 10..17 it basically works like this: 2 handles r0, 3 r1, 4 r2, etc. 10 handles
// r0, 11 r1, 12 r2 and so on.

// compiler!
// the switch skips whitespace. then, the beautiful loop thingymajigy emits bytecode.

#define W case
#define Q goto M;
char *R="hlt\0 ar1\2 ar2\3 ar3\4 ar4\5 ar5\6 ar6\7 ar7\x8 ar8\x9 r1a\xA r2a\xB r3a\xC r4a\xD r5a\xE r6a\xF r7a\20 r8a\21 mem\22 aca\23 add\24 sub\25 not\26 clr\27";K;as(char*I,int*O){char*V=R;while((K=*I)){V=R;switch(K){case 32:case 10:case 9:I++;Q}while(*V)V+=3,(strncmp(V-3,I,3)?:({*O++=*V;I+=3;Q})),V+=2;strncmp("con ",I,4)?:({*O++=1,*O++=atoi(I+=4);while(*I>47&*I<58)I++;Q});return 1;M:}return 0;}

#undef Q
#undef H
#undef W
#undef S

// ----------

#ifndef __WRAPPER
int main() {
    // __asm__("int $3");
    m[ 7 ]    = 1024;
    m[ 1024 ] = 1;
    m[ 1025 ] = 9;
    m[ 1026 ] = 1;
    m[ 1027 ] = 5;

    printf("before: %i\n", m[ 0 ]);
    pu();
    printf("after: %i\n", m[ 0 ]);
}
#endif