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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#ifndef RUST_UTIL_H
#define RUST_UTIL_H
#include <limits.h>
#include "rust_task.h"
#include "rust_env.h"
extern struct type_desc str_body_tydesc;
// Inline fn used regularly elsewhere.
// Rounds |size| to the nearest |alignment|. Invariant: |alignment| is a power
// of two.
template<typename T>
static inline T
align_to(T size, size_t alignment) {
assert(alignment);
T x = (T)(((uintptr_t)size + alignment - 1) & ~(alignment - 1));
return x;
}
// Interior vectors (rust-user-code level).
struct
rust_vec
{
size_t fill; // in bytes; if zero, heapified
size_t alloc; // in bytes
uint8_t data[0];
};
struct
rust_vec_box
{
rust_opaque_box header;
rust_vec body;
};
template <typename T>
inline size_t vec_size(size_t elems) {
return sizeof(rust_vec_box) + sizeof(T) * elems;
}
template <typename T>
inline T *
vec_data(rust_vec *v) {
return reinterpret_cast<T*>(v->data);
}
inline void reserve_vec_exact_shared(rust_task* task, rust_vec_box** vpp,
size_t size) {
rust_opaque_box** ovpp = (rust_opaque_box**)vpp;
if (size > (*vpp)->body.alloc) {
*vpp = (rust_vec_box*)task->boxed.realloc(
*ovpp, size + sizeof(rust_vec));
(*vpp)->body.alloc = size;
}
}
inline void reserve_vec_exact(rust_vec_box** vpp,
size_t size) {
if (size > (*vpp)->body.alloc) {
rust_exchange_alloc exchange_alloc;
*vpp = (rust_vec_box*)exchange_alloc
.realloc(*vpp, size + sizeof(rust_vec_box));
(*vpp)->body.alloc = size;
}
}
typedef rust_vec_box rust_str;
inline size_t get_box_size(size_t body_size, size_t body_align) {
size_t header_size = sizeof(rust_opaque_box);
// FIXME (#2699): This alignment calculation is suspicious. Is it right?
size_t total_size = align_to(header_size, body_align) + body_size;
return total_size;
}
//
// Local Variables:
// mode: C++
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
//
#endif
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