ref: 4d7c195804991b9c762f9a859679282c7014bbbb
dir: /sys/src/9/port/alloc.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "error.h"
#include <pool.h>
static void poolprint(Pool*, char*, ...);
static void ppanic(Pool*, char*, ...);
static void plock(Pool*);
static void punlock(Pool*);
typedef struct Private Private;
struct Private {
Lock lk;
char msg[256]; /* a rock for messages to be printed at unlock */
};
static Private pmainpriv;
static Pool pmainmem = {
.name= "Main",
.maxsize= 4*1024*1024,
.minarena= 128*1024,
.quantum= 32,
.alloc= xalloc,
.merge= xmerge,
.flags= POOL_TOLERANCE,
.lock= plock,
.unlock= punlock,
.print= poolprint,
.panic= ppanic,
.private= &pmainpriv,
};
static Private pimagpriv;
static Pool pimagmem = {
.name= "Image",
.maxsize= 16*1024*1024,
.minarena= 2*1024*1024,
.quantum= 32,
.alloc= xalloc,
.merge= xmerge,
.flags= 0,
.lock= plock,
.unlock= punlock,
.print= poolprint,
.panic= ppanic,
.private= &pimagpriv,
};
static Private psecrpriv;
static Pool psecrmem = {
.name= "Secrets",
.maxsize= 16*1024*1024,
.minarena= 64*1024,
.quantum= 32,
.alloc= xalloc,
.merge= xmerge,
.flags= POOL_ANTAGONISM,
.lock= plock,
.unlock= punlock,
.print= poolprint,
.panic= ppanic,
.private= &psecrpriv,
};
Pool* mainmem = &pmainmem;
Pool* imagmem = &pimagmem;
Pool* secrmem = &psecrmem;
/*
* because we can't print while we're holding the locks,
* we have the save the message and print it once we let go.
*/
static void
poolprint(Pool *p, char *fmt, ...)
{
va_list v;
Private *pv;
pv = p->private;
va_start(v, fmt);
vseprint(pv->msg+strlen(pv->msg), pv->msg+sizeof pv->msg, fmt, v);
va_end(v);
}
static void
ppanic(Pool *p, char *fmt, ...)
{
va_list v;
Private *pv;
char msg[sizeof pv->msg];
pv = p->private;
va_start(v, fmt);
vseprint(pv->msg+strlen(pv->msg), pv->msg+sizeof pv->msg, fmt, v);
va_end(v);
memmove(msg, pv->msg, sizeof msg);
iunlock(&pv->lk);
panic("%s", msg);
}
static void
plock(Pool *p)
{
Private *pv;
pv = p->private;
ilock(&pv->lk);
pv->lk.pc = getcallerpc(&p);
pv->msg[0] = 0;
}
static void
punlock(Pool *p)
{
Private *pv;
char msg[sizeof pv->msg];
pv = p->private;
if(pv->msg[0] == 0){
iunlock(&pv->lk);
return;
}
memmove(msg, pv->msg, sizeof msg);
iunlock(&pv->lk);
iprint("%.*s", sizeof pv->msg, msg);
}
void
poolsummary(Pool *p)
{
print("%s max %llud cur %llud free %llud alloc %llud\n", p->name,
(uvlong)p->maxsize, (uvlong)p->cursize,
(uvlong)p->curfree, (uvlong)p->curalloc);
}
void
mallocsummary(void)
{
poolsummary(mainmem);
poolsummary(imagmem);
poolsummary(secrmem);
}
/* everything from here down should be the same in libc, libdebugmalloc, and the kernel */
/* - except the code for malloc(), which alternately doesn't clear or does. */
/* - except the code for smalloc(), which lives only in the kernel. */
/*
* Npadlong is the number of ulong's to leave at the beginning of
* each allocated buffer for our own bookkeeping. We return to the callers
* a pointer that points immediately after our bookkeeping area. Incoming pointers
* must be decremented by that much, and outgoing pointers incremented.
* The malloc tag is stored at MallocOffset from the beginning of the block,
* and the realloc tag at ReallocOffset. The offsets are from the true beginning
* of the block, not the beginning the caller sees.
*
* The extra if(Npadlong != 0) in various places is a hint for the compiler to
* compile out function calls that would otherwise be no-ops.
*/
/* non tracing
*
enum {
Npadlong = 0,
MallocOffset = 0,
ReallocOffset = 0,
};
*
*/
/* tracing */
enum {
Npadlong = 2,
MallocOffset = 0,
ReallocOffset = 1
};
void*
smalloc(ulong size)
{
void *v;
while((v = poolalloc(mainmem, size+Npadlong*sizeof(ulong))) == nil){
if(!waserror()){
resrcwait(nil);
poperror();
}
}
if(Npadlong){
v = (ulong*)v+Npadlong;
setmalloctag(v, getcallerpc(&size));
}
memset(v, 0, size);
return v;
}
void*
malloc(ulong size)
{
void *v;
v = poolalloc(mainmem, size+Npadlong*sizeof(ulong));
if(v == nil)
return nil;
if(Npadlong){
v = (ulong*)v+Npadlong;
setmalloctag(v, getcallerpc(&size));
setrealloctag(v, 0);
}
memset(v, 0, size);
return v;
}
void*
mallocz(ulong size, int clr)
{
void *v;
v = poolalloc(mainmem, size+Npadlong*sizeof(ulong));
if(Npadlong && v != nil){
v = (ulong*)v+Npadlong;
setmalloctag(v, getcallerpc(&size));
setrealloctag(v, 0);
}
if(clr && v != nil)
memset(v, 0, size);
return v;
}
void*
mallocalign(ulong size, ulong align, long offset, ulong span)
{
void *v;
v = poolallocalign(mainmem, size+Npadlong*sizeof(ulong), align, offset-Npadlong*sizeof(ulong), span);
if(Npadlong && v != nil){
v = (ulong*)v+Npadlong;
setmalloctag(v, getcallerpc(&size));
setrealloctag(v, 0);
}
if(v)
memset(v, 0, size);
return v;
}
void
free(void *v)
{
if(v != nil)
poolfree(mainmem, (ulong*)v-Npadlong);
}
void*
realloc(void *v, ulong size)
{
void *nv;
if(v != nil)
v = (ulong*)v-Npadlong;
if(Npadlong !=0 && size != 0)
size += Npadlong*sizeof(ulong);
if(nv = poolrealloc(mainmem, v, size)){
nv = (ulong*)nv+Npadlong;
setrealloctag(nv, getcallerpc(&v));
if(v == nil)
setmalloctag(nv, getcallerpc(&v));
}
return nv;
}
ulong
msize(void *v)
{
return poolmsize(mainmem, (ulong*)v-Npadlong)-Npadlong*sizeof(ulong);
}
/* secret memory, used to back cryptographic keys and cipher states */
void*
secalloc(ulong size)
{
void *v;
while((v = poolalloc(secrmem, size+Npadlong*sizeof(ulong))) == nil){
if(!waserror()){
resrcwait(nil);
poperror();
}
}
if(Npadlong){
v = (ulong*)v+Npadlong;
setmalloctag(v, getcallerpc(&size));
setrealloctag(v, 0);
}
memset(v, 0, size);
return v;
}
void
secfree(void *v)
{
if(v != nil)
poolfree(secrmem, (ulong*)v-Npadlong);
}
void
setmalloctag(void *v, uintptr pc)
{
USED(v, pc);
if(Npadlong <= MallocOffset || v == nil)
return;
((ulong*)v)[-Npadlong+MallocOffset] = (ulong)pc;
}
void
setrealloctag(void *v, uintptr pc)
{
USED(v, pc);
if(Npadlong <= ReallocOffset || v == nil)
return;
((ulong*)v)[-Npadlong+ReallocOffset] = (ulong)pc;
}
uintptr
getmalloctag(void *v)
{
USED(v);
if(Npadlong <= MallocOffset)
return ~0;
return (int)((ulong*)v)[-Npadlong+MallocOffset];
}
uintptr
getrealloctag(void *v)
{
USED(v);
if(Npadlong <= ReallocOffset)
return ~0;
return (int)((ulong*)v)[-Npadlong+ReallocOffset];
}