157 lines
3.9 KiB
C++
157 lines
3.9 KiB
C++
#ifndef RUST_UTIL_H
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#define RUST_UTIL_H
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#include <limits.h>
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#include "rust_task.h"
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#include "rust_env.h"
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// Inline fn used regularly elsewhere.
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static inline size_t
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next_power_of_two(size_t s)
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{
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size_t tmp = s - 1;
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tmp |= tmp >> 1;
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tmp |= tmp >> 2;
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tmp |= tmp >> 4;
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tmp |= tmp >> 8;
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tmp |= tmp >> 16;
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#ifdef _LP64
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tmp |= tmp >> 32;
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#endif
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return tmp + 1;
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}
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// Rounds |size| to the nearest |alignment|. Invariant: |alignment| is a power
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// of two.
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template<typename T>
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static inline T
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align_to(T size, size_t alignment) {
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assert(alignment);
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T x = (T)(((uintptr_t)size + alignment - 1) & ~(alignment - 1));
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return x;
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}
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// Interior vectors (rust-user-code level).
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struct
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rust_vec
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{
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size_t fill; // in bytes; if zero, heapified
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size_t alloc; // in bytes
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uint8_t data[0];
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};
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template <typename T>
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inline size_t vec_size(size_t elems) {
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return sizeof(rust_vec) + sizeof(T) * elems;
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}
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template <typename T>
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inline T *
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vec_data(rust_vec *v) {
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return reinterpret_cast<T*>(v->data);
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}
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inline void reserve_vec_exact(rust_task* task, rust_vec** vpp, size_t size) {
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if (size > (*vpp)->alloc) {
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*vpp = (rust_vec*)task->kernel
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->realloc(*vpp, size + sizeof(rust_vec));
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(*vpp)->alloc = size;
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}
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}
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inline void reserve_vec(rust_task* task, rust_vec** vpp, size_t size) {
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reserve_vec_exact(task, vpp, next_power_of_two(size));
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}
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typedef rust_vec rust_str;
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inline rust_str *
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make_str(rust_kernel* kernel, const char* c, size_t strlen,
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const char* name) {
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size_t str_fill = strlen + 1;
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size_t str_alloc = str_fill;
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rust_str *str = (rust_str *)
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kernel->malloc(vec_size<char>(str_fill), name);
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str->fill = str_fill;
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str->alloc = str_alloc;
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memcpy(&str->data, c, strlen);
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str->data[strlen] = '\0';
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return str;
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}
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inline rust_vec *
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make_str_vec(rust_kernel* kernel, size_t nstrs, char **strs) {
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rust_vec *v = (rust_vec *)
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kernel->malloc(vec_size<rust_vec*>(nstrs),
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"str vec interior");
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v->fill = v->alloc = sizeof(rust_vec*) * nstrs;
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for (size_t i = 0; i < nstrs; ++i) {
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rust_str *str = make_str(kernel, strs[i],
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strlen(strs[i]),
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"str");
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((rust_str**)&v->data)[i] = str;
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}
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return v;
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}
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// Initialization helpers for ISAAC RNG
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inline void isaac_seed(uint8_t* dest)
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{
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size_t size = sizeof(ub4) * RANDSIZ;
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#ifdef __WIN32__
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HCRYPTPROV hProv;
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kernel->win32_require
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(_T("CryptAcquireContext"),
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CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT|CRYPT_SILENT));
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kernel->win32_require
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(_T("CryptGenRandom"), CryptGenRandom(hProv, size, (BYTE*) dest));
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kernel->win32_require
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(_T("CryptReleaseContext"), CryptReleaseContext(hProv, 0));
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#else
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int fd = open("/dev/urandom", O_RDONLY);
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assert(fd > 0);
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assert(read(fd, dest, size) == (int) size);
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assert(close(fd) == 0);
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#endif
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}
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inline void
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isaac_init(rust_kernel *kernel, randctx *rctx, rust_vec* user_seed)
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{
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memset(rctx, 0, sizeof(randctx));
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char *env_seed = kernel->env->rust_seed;
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if (user_seed != NULL) {
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// ignore bytes after the required length
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size_t seed_len = user_seed->fill < sizeof(rctx->randrsl)
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? user_seed->fill : sizeof(rctx->randrsl);
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memcpy(&rctx->randrsl, user_seed->data, seed_len);
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} else if (env_seed != NULL) {
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ub4 seed = (ub4) atoi(env_seed);
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for (size_t i = 0; i < RANDSIZ; i ++) {
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memcpy(&rctx->randrsl[i], &seed, sizeof(ub4));
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seed = (seed + 0x7ed55d16) + (seed << 12);
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}
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} else {
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isaac_seed((uint8_t*) &rctx->randrsl);
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}
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randinit(rctx, 1);
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}
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//
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// Local Variables:
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// mode: C++
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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#endif
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