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#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#pragma clang diagnostic ignored "-Wparentheses"
#pragma clang diagnostic ignored "-Wreturn-type"
#pragma clang diagnostic ignored "-Wempty-body"
// pu2!
// maybe compacter? idk
// last cpu: 167 chars
// NOTE: if you want the cpu to
// crash or do something when an invalid opcode is met,
// replace the `8` in the code with whatever behavior you desire.
// you can use ({...}) to insert normal code, or use __builtin_trap() for a SIGTRAP
// clang-format off
#define S 1<<20
#define H !--c
#define J while
m[S],c,v,a,b,u;pu2(){J(c=m[m[7]++],v=m[m[7]++],c){H?a=v:H?a=m[b]:H?u?m[a]=b:0:H?v=a,a=b,b=v:H?a+=b:H?a-=b:H?a&=b:H?a=!a:H?u=1:8;u=v;}}
// clang-format on
// there's just memory. no, really
// ok actually there's two registers called a and b
// 0 HLT: halt
// 1 IMM: a = imm
// 2 LOD: a = m[b]
// 3 STR: m[a] = b (only happens if acc != 0)
// 4 SWP: swap a and b
// 5 ADD: a += b
// 6 SUB: a -= b
// 7 AND: a &= b
// 8 NOT: a = !a
// 9 ACC: u = imm
// NOTE: Memory indexes less than 1024 should be considered as temporary/compute memory, and
// programs should be written at index 1024 and upwards.
//
// NOTE: Memory index 7 is the program
// counter, in which the current instruction is read from m[m[7]] at each cycle
// -------------------------
// yeehaw baby it's time for as2
// E is the error code loc. zero it before calling as2
// Y is macro storage. extend as needed
// set O for output before running. keep in mind, it gets modified whilst as2 is running.
// therefore, i recommend you store a copy somewhere!
// clang-format off
char*C="hltimmlodstrswpaddsubandnotacc",*Y[1<<10],*E,*L,i;*K;as2(char*I){J(c=*I++){if(c==35){J(*++I-10);c=*I++;}L=C;(!isspace(c)?c-39?c-125?c-123?c-64?({i=0,I--;J(i++,*L)strncmp(L,I,3)?L+=3:({I+=3;*K++=i-1;*K++=(i-2&&i-9)?0:strtol(I,&I,10);goto Q;});E=I;return 1;Q:;}):as2(Y[strtol(I,&I,10)]):({Y[strtol(I,&I,10)]=I+1;J(*I++-125);}):({break;}):({*K++=1;*K++=*I++;}):0);}}
// clang-format on
#undef S
#undef H
#undef J
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