76 lines
1.7 KiB
C++
76 lines
1.7 KiB
C++
// 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_type.h"
|
|
|
|
// 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);
|
|
}
|
|
|
|
typedef rust_vec rust_str;
|
|
|
|
inline size_t get_box_size(size_t body_size, size_t body_align) {
|
|
size_t header_size = sizeof(rust_opaque_box);
|
|
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
|