ref: 85ca0c9adc0d507b17f85b6de5227f533d9fb0b6
dir: /sys/src/cmd/prof.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
typedef struct Data Data;
typedef struct Pc Pc;
typedef struct Acc Acc;
struct Data
{
ushort down;
ushort right;
ulong pc;
ulong count;
uvlong time;
};
enum { Datasz = 2+2+4+4+8 };
struct Pc
{
Pc *next;
ulong pc;
};
struct Acc
{
char *name;
ulong pc;
uvlong ticks;
uvlong calls;
};
Data* data;
Acc* acc;
uvlong ticks;
long nsym;
long ndata;
int dflag;
int rflag;
Biobuf bout;
int tabstop = 4;
int verbose;
uvlong cyclefreq;
void syms(char*);
void datas(char*);
void graph(int, ulong, Pc*);
void plot(void);
char* name(ulong);
void indent(int);
char* defaout(void);
void
main(int argc, char *argv[])
{
char *s;
s = getenv("tabstop");
if(s!=nil && strtol(s,0,0)>0)
tabstop = strtol(s,0,0);
ARGBEGIN{
case 'v':
verbose = 1;
break;
case 'd':
dflag = 1;
break;
case 'r':
rflag = 1;
break;
default:
usage:
fprint(2, "usage: prof [-dr] [8.out] [prof.out]\n");
exits("usage");
}ARGEND
Binit(&bout, 1, OWRITE);
if(argc < 2)
goto usage;
syms(argv[0]);
datas(argv[1]);
if(ndata){
if(dflag)
graph(0, data[0].down, 0);
else
plot();
}
exits(0);
}
int
acmp(void *va, void *vb)
{
Acc *a, *b;
uvlong ua, ub;
a = va;
b = vb;
ua = a->ticks;
ub = b->ticks;
if(ua > ub)
return 1;
if(ua < ub)
return -1;
return 0;
}
void
syms(char *cout)
{
Fhdr f;
int fd;
if((fd = open(cout, 0)) < 0)
sysfatal("%r");
if(!crackhdr(fd, &f))
sysfatal("can't read text file header: %r");
if(f.type == FNONE)
sysfatal("text file not an a.out");
if(syminit(fd, &f) < 0)
sysfatal("syminit: %r");
close(fd);
}
#define GET2(p) (u16int)(p)[1] | (u16int)(p)[0]<<8
#define GET4(p) (u32int)(p)[3] | (u32int)(p)[2]<<8 | (u32int)(p)[1]<<16 | (u32int)(p)[0]<<24
#define GET8(p) (u64int)(p)[7] | (u64int)(p)[6]<<8 | (u64int)(p)[5]<<16 | (u64int)(p)[4]<<24 | \
(u64int)(p)[3]<<32 | (u64int)(p)[2]<<40 | (u64int)(p)[1]<<48 | (u64int)(p)[0]<<56
void
datas(char *dout)
{
int fd;
Dir *d;
int i;
uchar hdr[3+1+8], *buf, *p;
if((fd = open(dout, 0)) < 0){
perror(dout);
exits("open");
}
d = dirfstat(fd);
if(d == nil){
perror(dout);
exits("stat");
}
d->length -= sizeof hdr;
ndata = d->length/Datasz;
data = malloc(ndata*sizeof(Data));
buf = malloc(d->length);
if(buf == 0 || data == 0)
sysfatal("malloc");
if(read(fd, hdr, sizeof hdr) != sizeof hdr)
sysfatal("read data header: %r");
if(memcmp(hdr, "pr\x0f", 3) != 0)
sysfatal("bad magic");
cyclefreq = GET8(hdr+4);
if(readn(fd, buf, d->length) != d->length)
sysfatal("data file read: %r");
for(p = buf, i = 0; i < ndata; i++){
data[i].down = GET2(p); p += 2;
data[i].right = GET2(p); p += 2;
data[i].pc = GET4(p); p += 4;
data[i].count = GET4(p); p += 4;
data[i].time = GET8(p); p += 8;
}
free(buf);
free(d);
close(fd);
}
char*
name(ulong pc)
{
Symbol s;
static char buf[16];
if (findsym(pc, CTEXT, &s))
return(s.name);
snprint(buf, sizeof(buf), "#%lux", pc);
return buf;
}
void
graph(int ind, ulong i, Pc *pc)
{
long count, prgm;
vlong time;
Pc lpc;
if(i >= ndata){
fprint(2, "prof: index out of range %ld [max %ld]\n", i, ndata);
return;
}
count = data[i].count;
time = data[i].time;
prgm = data[i].pc;
if(time < 0)
time += data[0].time;
if(data[i].right != 0xFFFF)
graph(ind, data[i].right, pc);
indent(ind);
if(count == 1)
Bprint(&bout, "%s:%.9f\n", name(prgm), (double)time/cyclefreq);
else
Bprint(&bout, "%s:%.9f/%lud\n", name(prgm), (double)time/cyclefreq, count);
if(data[i].down == 0xFFFF)
return;
lpc.next = pc;
lpc.pc = prgm;
if(!rflag){
while(pc){
if(pc->pc == prgm){
indent(ind+1);
Bprint(&bout, "...\n");
return;
}
pc = pc->next;
}
}
graph(ind+1, data[i].down, &lpc);
}
/*
* assume acc is ordered by increasing text address.
*/
long
symind(ulong pc)
{
int top, bot, mid;
bot = 0;
top = nsym;
for (mid = (bot+top)/2; mid < top; mid = (bot+top)/2) {
if (pc < acc[mid].pc)
top = mid;
else
if (mid != nsym-1 && pc >= acc[mid+1].pc)
bot = mid;
else
return mid;
}
return -1;
}
double
sum(ulong i)
{
long j;
vlong dtime, time;
int k;
static indent;
if(i >= ndata){
fprint(2, "prof: index out of range %ld [max %ld]\n", i, ndata);
return 0;
}
j = symind(data[i].pc);
time = data[i].time;
if(time < 0)
time += data[0].time;
if (verbose){
for(k = 0; k < indent; k++)
print(" ");
print("%lud: %llud/%.9f/%lud", i, data[i].time, (double)data[i].time/cyclefreq, data[i].count);
if (j >= 0)
print(" %s\n", acc[j].name);
else
print(" 0x%lux\n", data[i].pc);
}
dtime = 0;
if(data[i].down != 0xFFFF){
indent++;
dtime = sum(data[i].down);
indent--;
}
j = symind(data[i].pc);
if (j >= 0) {
acc[j].ticks += time - dtime;
ticks += time - dtime;
acc[j].calls += data[i].count;
}
if(data[i].right == 0xFFFF)
return time;
return time + sum(data[i].right);
}
void
plot(void)
{
Symbol s;
for (nsym = 0; textsym(&s, nsym); nsym++) {
acc = realloc(acc, (nsym+1)*sizeof(Acc));
if(acc == 0){
fprint(2, "prof: malloc fail\n");
exits("acc malloc");
}
acc[nsym].name = s.name;
acc[nsym].pc = s.value;
acc[nsym].calls = acc[nsym].ticks = 0;
}
sum(data[0].down);
qsort(acc, nsym, sizeof(Acc), acmp);
Bprint(&bout, " %% Time Calls Name\n");
if(ticks == 0)
ticks = 1;
while (--nsym >= 0) {
if(acc[nsym].calls)
Bprint(&bout, "%4.1f %.9f %8llud\t%s\n",
(100.0*acc[nsym].ticks)/ticks,
(double)acc[nsym].ticks/cyclefreq,
acc[nsym].calls,
acc[nsym].name);
}
}
void
indent(int ind)
{
int j;
j = 2*ind;
while(j >= tabstop){
Bwrite(&bout, ".\t", 2);
j -= tabstop;
}
if(j)
Bwrite(&bout, ". ", j);
}