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#ifndef RUST_UTIL_H
#define RUST_UTIL_H
// Reference counted objects
template <typename T>
rc_base<T>::rc_base() :
ref_count(1)
{
}
template <typename T>
rc_base<T>::~rc_base()
{
}
// Utility type: pointer-vector.
template <typename T>
ptr_vec<T>::ptr_vec(rust_dom *dom) :
dom(dom),
alloc(INIT_SIZE),
fill(0),
data(new (dom) T*[alloc])
{
I(dom, data);
dom->log(rust_log::MEM,
"new ptr_vec(data=0x%" PRIxPTR ") -> 0x%" PRIxPTR,
(uintptr_t)data, (uintptr_t)this);
}
template <typename T>
ptr_vec<T>::~ptr_vec()
{
I(dom, data);
dom->log(rust_log::MEM,
"~ptr_vec 0x%" PRIxPTR ", data=0x%" PRIxPTR,
(uintptr_t)this, (uintptr_t)data);
I(dom, fill == 0);
dom->free(data);
}
template <typename T> T *&
ptr_vec<T>::operator[](size_t offset) {
I(dom, data[offset]->idx == offset);
return data[offset];
}
template <typename T>
void
ptr_vec<T>::push(T *p)
{
I(dom, data);
I(dom, fill <= alloc);
if (fill == alloc) {
alloc *= 2;
data = (T **)dom->realloc(data, alloc * sizeof(T*));
I(dom, data);
}
I(dom, fill < alloc);
p->idx = fill;
data[fill++] = p;
}
template <typename T>
T *
ptr_vec<T>::pop()
{
return data[--fill];
}
template <typename T>
T *
ptr_vec<T>::peek()
{
return data[fill - 1];
}
template <typename T>
void
ptr_vec<T>::trim(size_t sz)
{
I(dom, data);
if (sz <= (alloc / 4) &&
(alloc / 2) >= INIT_SIZE) {
alloc /= 2;
I(dom, alloc >= fill);
data = (T **)dom->realloc(data, alloc * sizeof(T*));
I(dom, data);
}
}
template <typename T>
void
ptr_vec<T>::swap_delete(T *item)
{
/* Swap the endpoint into i and decr fill. */
I(dom, data);
I(dom, fill > 0);
I(dom, item->idx < fill);
fill--;
if (fill > 0) {
T *subst = data[fill];
size_t idx = item->idx;
data[idx] = subst;
subst->idx = idx;
}
}
// Inline fn used regularly elsewhere.
static inline size_t
next_power_of_two(size_t s)
{
size_t tmp = s - 1;
tmp |= tmp >> 1;
tmp |= tmp >> 2;
tmp |= tmp >> 4;
tmp |= tmp >> 8;
tmp |= tmp >> 16;
#if SIZE_MAX == UINT64_MAX
tmp |= tmp >> 32;
#endif
return tmp + 1;
}
// Initialization helper for ISAAC RNG
static inline void
isaac_init(rust_dom *dom, randctx *rctx)
{
memset(rctx, 0, sizeof(randctx));
#ifdef __WIN32__
{
HCRYPTPROV hProv;
dom->win32_require
(_T("CryptAcquireContext"),
CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT|CRYPT_SILENT));
dom->win32_require
(_T("CryptGenRandom"),
CryptGenRandom(hProv, sizeof(rctx->randrsl),
(BYTE*)(&rctx->randrsl)));
dom->win32_require
(_T("CryptReleaseContext"),
CryptReleaseContext(hProv, 0));
}
#else
char *rust_seed = getenv("RUST_SEED");
if (rust_seed != NULL) {
ub4 seed = (ub4) atoi(rust_seed);
for (size_t i = 0; i < RANDSIZ; i ++) {
memcpy(&rctx->randrsl[i], &seed, sizeof(ub4));
seed = (seed + 0x7ed55d16) + (seed << 12);
}
} else {
int fd = open("/dev/urandom", O_RDONLY);
I(dom, fd > 0);
I(dom, read(fd, (void*) &rctx->randrsl, sizeof(rctx->randrsl))
== sizeof(rctx->randrsl));
I(dom, close(fd) == 0);
}
#endif
randinit(rctx, 1);
}
// Vectors (rust-user-code level).
struct
rust_vec : public rc_base<rust_vec>
{
size_t alloc;
size_t fill;
size_t pad; // Pad to align data[0] to 16 bytes.
uint8_t data[];
rust_vec(rust_dom *dom, size_t alloc, size_t fill, uint8_t const *d) :
alloc(alloc),
fill(fill)
{
if (d)
memcpy(&data[0], d, fill);
}
~rust_vec() {}
};
// Rust types vec and str look identical from our perspective.
typedef rust_vec rust_str;
//
// Local Variables:
// mode: C++
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C .. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
//
#endif
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