ref: 4dbb99f478d68eaeea4c043a839454cb807c2c7d
dir: /sys/src/cmd/aux/acidleak.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
void*
emalloc(ulong sz)
{
void *v;
v = malloc(sz);
if(v == nil)
sysfatal("malloc %lud fails", sz);
memset(v, 0, sz);
return v;
}
void*
erealloc(void *v, ulong sz)
{
v = realloc(v, sz);
if(v == nil)
sysfatal("realloc %lud fails", sz);
return v;
}
char*
estrdup(char* s)
{
char *r;
r = strdup(s);
if(r == nil)
sysfatal("strdup fails");
return r;
}
typedef struct Block Block;
typedef struct Data Data;
struct Block {
ulong addr;
ulong size;
ulong w0;
ulong w1;
char *s0;
char *s1;
int mark;
int free;
Data *d;
};
struct Data {
ulong addr;
ulong val;
uchar type;
Block *b;
};
Block *block;
uint nblock;
uint ablock;
Data *data;
Data *edata;
uint ndata;
uint adata;
int
addrcmp(void *va, void *vb)
{
ulong *a, *b;
a = va;
b = vb;
if(*a < *b)
return -1;
if(*a > *b)
return 1;
return 0;
}
Block*
findblock(ulong addr)
{
int lo, hi, m;
lo = 0;
hi = nblock;
while(lo < hi) {
m = (lo+hi)/2;
if(block[m].addr < addr)
lo = m+1;
else if(addr < block[m].addr)
hi = m;
else
return &block[m];
}
return nil;
}
Data*
finddata(ulong addr)
{
int lo, hi, m;
lo = 0;
hi = ndata;
while(lo < hi) {
m = (lo+hi)/2;
if(data[m].addr < addr)
lo = m+1;
else if(addr < data[m].addr)
hi = m;
else
return &data[m];
}
if(0 <= lo && lo < ndata)
return &data[lo];
return nil;
}
int nmark;
int
markblock(ulong from, ulong fromval, Block *b)
{
Data *d;
ulong top;
Block *nb;
USED(from, fromval);
//print("trace 0x%.8lux from 0x%.8lux (%d)\n", b->addr, from, b->mark);
if(b->free){
// fprint(2, "possible dangling pointer *0x%.8lux = 0x%.8lux\n", from, fromval);
return 0;
}
if(b->mark)
return 0;
b->mark = 1;
nmark++;
if(d = finddata(b->addr)) {
assert(d->addr >= b->addr);
b->d = d;
top = b->addr+b->size;
for(; d < edata && d->addr < top; d++) {
assert(d->b == 0);
d->b = b;
if((nb = findblock(d->val-8)) || (nb = findblock(d->val-8-8)))
markblock(d->addr, d->val, nb);
}
return 1;
}
return 0;
}
enum {
AllocColor = 2, // dark blue: completely allocated region
HdrColor = 54, // bright blue: region with header
LeakColor = 205, // dark red: region with leak
LeakHdrColor = 240, // bright red: region with leaked header
FreeColor = 252, // bright yellow: completely free region
NoColor = 255, // padding, white
};
int
rXr(int as, int ae, int bs, int be)
{
return bs < ae && as < be;
}
void
main(int argc, char **argv)
{
Biobuf bio;
char *p, *f[10];
int bitmap, c, nf, resolution, n8, n16, hdr, nhdr, nlhdr, nleak, x, y, nb;
ulong allocstart, allocend, len, u;
Data *d, *ed;
Block *b, *eb;
bitmap = 0;
resolution = 8;
x = 512;
ARGBEGIN{
case 'b':
bitmap=1;
break;
case 'r':
resolution = atoi(EARGF(sysfatal("usage")));
break;
case 'x':
x = atoi(EARGF(sysfatal("usage")));
break;
}ARGEND
n8 = n16 = 0;
allocstart = allocend = 0;
Binit(&bio, 0, OREAD);
while(p=Brdline(&bio, '\n')) {
p[Blinelen(&bio)-1] = '\0';
nf = tokenize(p, f, nelem(f));
if(nf >= 4 && strcmp(f[0], "data") == 0) {
if(ndata >= adata){
if(adata == 0)
adata = 4096;
else
adata += adata / 4; /* increase 25% */
data = erealloc(data, adata * sizeof(Data));
}
data[ndata].addr = strtoul(f[1], nil, 0);
data[ndata].val = strtoul(f[2], nil, 0);
data[ndata].type = f[3][0];
data[ndata].b = 0;
ndata++;
}
if(nf >= 5 &&
(strcmp(f[0], "block") == 0 || strcmp(f[0], "free") == 0)) {
if(nblock >= ablock){
if(ablock == 0)
ablock = 4096;
else
ablock += ablock / 4; /* increase 25% */
block = erealloc(block, ablock * sizeof(Block));
}
block[nblock].addr = strtoul(f[1], nil, 0);
block[nblock].size = strtoul(f[2], nil, 0);
block[nblock].w0 = strtoul(f[3], nil, 0);
block[nblock].w1 = strtoul(f[4], nil, 0);
if (nf >= 7) {
block[nblock].s0 = estrdup(f[5]);
block[nblock].s1 = estrdup(f[6]);
} else {
block[nblock].s0 = "";
block[nblock].s1 = "";
}
block[nblock].mark = 0;
block[nblock].d = 0;
block[nblock].free = strcmp(f[0], "free") == 0;
nblock++;
}
if(nf >= 4 && strcmp(f[0], "range") == 0 && strcmp(f[1], "alloc") == 0) {
allocstart = strtoul(f[2], 0, 0)&~15;
allocend = strtoul(f[3], 0, 0);
}
}
qsort(block, nblock, sizeof(Block), addrcmp);
qsort(data, ndata, sizeof(Data), addrcmp);
ed = edata = data+ndata;
for(d=data; d<ed; d++) {
if(d->type == 'a')
continue;
if(b = findblock(d->val-8)) // pool header 2 words
n8 += markblock(d->addr, d->val, b);
else if(b = findblock(d->val-8-8)) // sometimes malloc header 2 words
n16 += markblock(d->addr, d->val, b);
else
{}//print("noblock %.8lux\n", d->val);
}
Binit(&bio, 1, OWRITE);
if(bitmap){
if(n8 > n16) // guess size of header
hdr = 8;
else
hdr = 16;
for(d=data; d<ed; d++)
if(d->type=='a')
break;
if(d==ed)
sysfatal("no allocated data region");
len = (allocend-allocstart+resolution-1)/resolution;
y = (len+x-1)/x;
Bprint(&bio, "%11s %11d %11d %11d %11d ", "m8", 0, 0, x, y);
//fprint(2, "alloc %lux %lux x %d y %d res %d\n", allocstart, allocend, x, y, resolution);
b = block;
eb = block+nblock;
for(u = allocstart; u<allocend; u+=resolution){
//fprint(2, "u %lux %lux baddr %lux\n", u, u+resolution, b->addr);
while(b->addr+b->size <= u && b < eb)
//{
//fprint(2, "\tskip %lux %lux\n", b->addr, b->addr+b->size);
b++;
//}
nhdr = 0;
nleak = 0;
nb = 0;
nlhdr = 0;
if(block < b && u < (b-1)->addr+(b-1)->size)
b--;
for(; b->addr < u+resolution && b < eb; b++){
//fprint(2, "\tblock %lux %lux %d\n", b->addr, b->addr+b->size, b->mark);
if(rXr(b->addr, b->addr+hdr, u, u+resolution)
|| rXr(b->addr+b->size-8, b->addr+b->size, u, u+resolution)){
if(b->mark == 0 && !b->free)
nlhdr++;
else
nhdr++;
}
if(b->free)
continue;
if(b->mark == 0)
nleak++;
nb++;
}
if(nhdr)
c = HdrColor;
else if(nlhdr)
c = LeakHdrColor;
else if(nleak)
c = LeakColor;
else if(nb)
c = AllocColor;
else
c = FreeColor;
//fprint(2, "\t%d\n", c);
Bputc(&bio, c);
}
allocend = allocstart+x*y*resolution;
for(; u < allocend; u+=resolution)
Bputc(&bio, NoColor);
}else{
eb = block+nblock;
for(b=block; b<eb; b++)
if(b->mark == 0 && !b->free)
Bprint(&bio, "block 0x%.8lux 0x%.8lux 0x%.8lux 0x%.8lux %s %s\n", b->addr, b->size, b->w0, b->w1, b->s0, b->s1);
}
Bterm(&bio);
exits(nil);
}