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#include <stdlib.h>
#include <stdint.h>
#include <assert.h>
#include <string.h>
#include "../memcheck.h"
struct cell
{
struct cell *next;
int x;
};
struct pool
{
size_t allocated;
size_t used;
uint8_t *buf;
};
void *
allocate_from_pool(struct pool *p, size_t n)
{
void *a = p->buf + p->used;
assert(p->used + n < p->allocated);
VALGRIND_MEMPOOL_ALLOC(p, a, n);
p->used += n;
return a;
}
struct pool *
allocate_pool()
{
struct pool *p = malloc(sizeof(struct pool));
assert(p);
p->allocated = 4096;
p->used = 0;
p->buf = malloc(p->allocated);
assert(p->buf);
memset(p->buf, 0, p->allocated);
VALGRIND_CREATE_MEMPOOL(p, 0, 0);
(void) VALGRIND_MAKE_MEM_NOACCESS(p->buf, p->allocated);
return p;
}
#define N 100
/* flags */
int static_roots = 0;
int trim_pool = 0;
int destroy_pool = 0;
void set_flags ( int n )
{
switch (n) {
case 0:
static_roots = 0;
trim_pool = 0;
destroy_pool = 0;
break;
case 1:
static_roots = 0;
trim_pool = 1;
destroy_pool = 0;
break;
case 2:
static_roots = 0;
trim_pool = 0;
destroy_pool = 1;
break;
case 3:
static_roots = 1;
trim_pool = 0;
destroy_pool = 0;
break;
case 4:
static_roots = 1;
trim_pool = 1;
destroy_pool = 0;
break;
case 5:
static_roots = 1;
trim_pool = 0;
destroy_pool = 1;
break;
default:
assert(0);
}
}
struct cell *cells_static[N];
int main( int argc, char** argv )
{
struct cell *cells_local[N];
int arg;
size_t i;
struct pool *p = allocate_pool();
struct cell **cells = static_roots ? cells_static : cells_local;
assert(argc == 2);
assert(argv[1]);
assert(strlen(argv[1]) == 1);
assert(argv[1][0] >= '0' && argv[1][0] <= '5');
arg = atoi( argv[1] );
set_flags( arg );
memset(cells_static, 0, sizeof(cells_static));
memset(cells_local, 0, sizeof(cells_local));
for (i = 0; i < N; ++i) {
cells[i] = allocate_from_pool(p, sizeof(struct cell));
}
if (trim_pool)
VALGRIND_MEMPOOL_TRIM(p,
p->buf+(10 * sizeof(struct cell)),
20 * sizeof(struct cell) + 2);
if (destroy_pool)
VALGRIND_DESTROY_MEMPOOL(p);
return 0;
}
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