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#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <fcntl.h>
#include <assert.h>
#include <sys/stat.h>
typedef int8_t i8;
typedef uint8_t u8;
typedef int64_t i64;
__attribute__((noreturn))
static void dieperror(const char *func){
perror(func);
exit(1);
}
__attribute__((noreturn,format(printf,1,2)))
static void die(const char *format,...){
va_list ap;
va_start(ap,format);
vfprintf(stderr,format,ap);
va_end(ap);
exit(1);
}
static int gcd(int a,int b){
while(b!=0){
int t=a%b;
a=b;
b=t;
}
return a;
}
static char* readfile(const char *fname,i64 *length){
int fd=open(fname,O_RDONLY);
if(fd<0)dieperror("open");
struct stat statbuf;
if(fstat(fd,&statbuf)<0)dieperror("fstat");
*length=statbuf.st_size;
FILE *f=fdopen(fd,"r");
assert(f);
char *mem=malloc(*length+1);
assert(mem);
if((i64)fread(mem,1,*length,f)<*length)die("Invalid file length");
fclose(f);
return mem;
}
enum instype {
IADD,
ISET,
ISLIDE,
ILOOP1,
ILOOP2,
IINPUT,
IOUTPUT,
IDEBUG,
};
struct ins {
enum instype type;
int off;
u8 value;
};
struct program {
struct ins *ins;
i64 len,cap;
};
static struct program p_make(void){
struct program p;
p.cap=16;
p.len=0;
p.ins=malloc(p.cap*sizeof(struct ins));
assert(p.ins);
return p;
}
static void p_ensure(struct program *p,i64 len){
if(len>p->cap){
p->cap=len+16;
p->ins=realloc(p->ins,p->cap*sizeof(struct ins));
assert(p->ins);
}
}
static void p_insert(struct program *p,i64 i,struct ins ins){
p_ensure(p,p->len+1);
memmove(p->ins+i+1,p->ins+i,(p->len-i)*sizeof(struct ins));
p->ins[i]=ins;
p->len++;
}
static void p_append(struct program *p,struct ins ins){
p_ensure(p,p->len+1);
p->ins[p->len]=ins;
p->len++;
}
static void p_erase(struct program *p,i64 i){
memmove(p->ins+i,p->ins+i+1,(p->len-i)*sizeof(struct ins));
p->len--;
}
static void p_dump(const struct program p,FILE *f){
for(i64 i=0;i<p.len;i++){
switch(p.ins[i].type){
case IADD:
fprintf(f,"+%d,%d ",
p.ins[i].off,(int)(i8)p.ins[i].value);
break;
case ISET:
fprintf(f,"S%d,%d ",
p.ins[i].off,(int)(i8)p.ins[i].value);
break;
case ISLIDE:
fprintf(f,"%c%d ",
p.ins[i].off<0?'<':'>',p.ins[i].off);
break;
case IINPUT:
fprintf(f,"I%d ",p.ins[i].off);
break;
case IOUTPUT:
fprintf(f,"O%d ",p.ins[i].off);
break;
case ILOOP1:
fprintf(f,"[%d ",p.ins[i].off);
break;
case ILOOP2:
fprintf(f,"] ");
break;
case IDEBUG:
fprintf(f,"# ");
break;
}
}
fputc('\n',f);
}
static void p_run(const struct program p){
i64 *jm=calloc(p.len,sizeof(i64));
assert(jm);
{
i64 cap=16,len=0;
i64 *stk=malloc(cap*sizeof(i64));
for(i64 i=0;i<p.len;i++){
if(p.ins[i].type==ILOOP1){
if(len==cap){
cap*=2;
stk=realloc(stk,cap*sizeof(i64));
assert(stk);
}
stk[len++]=i;
} else if(p.ins[i].type==ILOOP2){
if(len==0)die("Jm: mismatched loops");
jm[stk[len-1]]=i;
jm[i]=stk[len-1];
len--;
}
}
free(stk);
}
const i64 memsize=60000,startidx=30000;
u8 *mem=calloc(memsize,1);
assert(mem);
for(i64 ip=0,mp=startidx;ip<p.len;ip++){
switch(p.ins[ip].type){
case IADD: mem[mp+p.ins[ip].off]+=p.ins[ip].value; break;
case ISET: mem[mp+p.ins[ip].off]=p.ins[ip].value; break;
case ISLIDE: mp+=p.ins[ip].off; break;
case IINPUT: mem[mp+p.ins[ip].off]=getchar(); break;
case IOUTPUT: putchar(mem[mp+p.ins[ip].off]); break;
case ILOOP1: if(!mem[mp+p.ins[ip].off])ip=jm[ip]; break;
case ILOOP2: if(mem[mp+p.ins[ip].off])ip=jm[ip]; break;
case IDEBUG: {
int low=0,high=memsize-1;
while(low<startidx&&mem[low]==0)low++;
while(high>startidx&&mem[high]==0)high--;
for(int i=low;i<=high;i++){
fprintf(stderr,"%3u ",(unsigned)mem[i]);
}
fputc('\n',stderr);
break;
}
}
}
free(jm);
free(mem);
}
static struct program parse(const char *source,i64 length){
struct program p=p_make();
int offset=0;
u8 addc=0;
i64 depth=0;
for(i64 i=0;i<length;i++){
if(strchr("+-><,.[]#",source[i])==NULL)continue;
if(source[i]=='+'){addc++; continue;}
if(source[i]=='-'){addc--; continue;}
if(addc!=0)p_append(&p,(struct ins){IADD,offset,addc});
addc=0;
if(source[i]=='>'){offset++; continue;}
if(source[i]=='<'){offset--; continue;}
if(source[i]==','){
p_append(&p,(struct ins){IINPUT,offset,0});
continue;
}
if(source[i]=='.'){
p_append(&p,(struct ins){IOUTPUT,offset,0});
continue;
}
if(offset!=0)p_append(&p,(struct ins){ISLIDE,offset,0});
offset=0;
if(source[i]=='['){
depth++;
p_append(&p,(struct ins){ILOOP1,offset,0});
continue;
}
if(source[i]==']'){
if(depth==0)die("Parse: mismatched loops");
depth--;
p_append(&p,(struct ins){ILOOP2,0,0});
continue;
}
if(source[i]=='#'){
p_append(&p,(struct ins){IDEBUG,0,0});
continue;
}
}
return p;
}
int main(int argc,char **argv){
if(argc!=2){
die("Usage: %s <file.bf>\n",argv[0]);
}
i64 length;
char *source=readfile(argv[1],&length);
struct program p=parse(source,length);
// p_dump(p,stdout);
p_run(p);
}
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