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[package]
name = "hashglobe"
version = "0.1.0"
authors = ["The Rust Project Developers", "Manish Goregaokar <manishsmail@gmail.com>"]
license = "MIT/Apache-2.0"
description = "Fork of std::HashMap with stable fallible allocation."
documentation = "https://docs.rs/hashglobe"
repository = "https://github.com/Manishearth/hashglobe"
readme = "README.md"
[dependencies]
libc = "0.2"
[dev-dependencies]
rand = "0.3"

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hashglobe
========
This is a fork of Rust's `std::HashMap`. It works on stable out of the stdlib and has fallible APIs.
We intend to diverge as little as possible from the original hashmap.
Dual licensed Apache/MIT, the same as the stdlib.
## Should I use this?
No.
Wait for https://github.com/rust-lang/rfcs/pull/2116 instead.

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// FORK NOTE: Copied from liballoc_system, removed unnecessary APIs,
// APIs take size/align directly instead of Layout
// The minimum alignment guaranteed by the architecture. This value is used to
// add fast paths for low alignment values. In practice, the alignment is a
// constant at the call site and the branch will be optimized out.
#[cfg(all(any(target_arch = "x86",
target_arch = "arm",
target_arch = "mips",
target_arch = "powerpc",
target_arch = "powerpc64",
target_arch = "asmjs",
target_arch = "wasm32")))]
const MIN_ALIGN: usize = 8;
#[cfg(all(any(target_arch = "x86_64",
target_arch = "aarch64",
target_arch = "mips64",
target_arch = "s390x",
target_arch = "sparc64")))]
const MIN_ALIGN: usize = 16;
pub use self::platform::{alloc, dealloc};
#[cfg(any(unix, target_os = "redox"))]
mod platform {
extern crate libc;
use std::ptr;
use super::MIN_ALIGN;
#[inline]
pub unsafe fn alloc(size: usize, align: usize) -> *mut u8 {
let ptr = if align <= MIN_ALIGN {
libc::malloc(size) as *mut u8
} else {
aligned_malloc(size, align)
};
ptr
}
#[inline]
pub unsafe fn dealloc(ptr: *mut u8, _align: usize) {
libc::free(ptr as *mut libc::c_void)
}
#[cfg(any(target_os = "android", target_os = "redox"))]
#[inline]
unsafe fn aligned_malloc(size: usize, align: usize) -> *mut u8 {
// On android we currently target API level 9 which unfortunately
// doesn't have the `posix_memalign` API used below. Instead we use
// `memalign`, but this unfortunately has the property on some systems
// where the memory returned cannot be deallocated by `free`!
//
// Upon closer inspection, however, this appears to work just fine with
// Android, so for this platform we should be fine to call `memalign`
// (which is present in API level 9). Some helpful references could
// possibly be chromium using memalign [1], attempts at documenting that
// memalign + free is ok [2] [3], or the current source of chromium
// which still uses memalign on android [4].
//
// [1]: https://codereview.chromium.org/10796020/
// [2]: https://code.google.com/p/android/issues/detail?id=35391
// [3]: https://bugs.chromium.org/p/chromium/issues/detail?id=138579
// [4]: https://chromium.googlesource.com/chromium/src/base/+/master/
// /memory/aligned_memory.cc
libc::memalign(align, size) as *mut u8
}
#[cfg(not(any(target_os = "android", target_os = "redox")))]
#[inline]
unsafe fn aligned_malloc(size: usize, align: usize) -> *mut u8 {
let mut out = ptr::null_mut();
let ret = libc::posix_memalign(&mut out, align, size);
if ret != 0 {
ptr::null_mut()
} else {
out as *mut u8
}
}
}
#[cfg(windows)]
#[allow(bad_style)]
mod platform {
use super::MIN_ALIGN;
type LPVOID = *mut u8;
type HANDLE = LPVOID;
type SIZE_T = usize;
type DWORD = u32;
type BOOL = i32;
extern "system" {
fn GetProcessHeap() -> HANDLE;
fn HeapAlloc(hHeap: HANDLE, dwFlags: DWORD, dwBytes: SIZE_T) -> LPVOID;
fn HeapFree(hHeap: HANDLE, dwFlags: DWORD, lpMem: LPVOID) -> BOOL;
fn GetLastError() -> DWORD;
}
#[repr(C)]
struct Header(*mut u8);
unsafe fn get_header<'a>(ptr: *mut u8) -> &'a mut Header {
&mut *(ptr as *mut Header).offset(-1)
}
unsafe fn align_ptr(ptr: *mut u8, align: usize) -> *mut u8 {
let aligned = ptr.offset((align - (ptr as usize & (align - 1))) as isize);
*get_header(aligned) = Header(ptr);
aligned
}
#[inline]
unsafe fn allocate_with_flags(size: usize, align: usize, flags: DWORD) -> *mut u8
{
if align <= MIN_ALIGN {
HeapAlloc(GetProcessHeap(), flags, size)
} else {
let size = size + align;
let ptr = HeapAlloc(GetProcessHeap(), flags, size);
if ptr.is_null() {
ptr
} else {
align_ptr(ptr, align)
}
}
}
#[inline]
pub unsafe fn alloc(size: usize, align: usize) -> *mut u8 {
allocate_with_flags(size, align, 0)
}
#[inline]
pub unsafe fn dealloc(ptr: *mut u8, align: usize) {
if align <= MIN_ALIGN {
let err = HeapFree(GetProcessHeap(), 0, ptr as LPVOID);
debug_assert!(err != 0, "Failed to free heap memory: {}",
GetLastError());
} else {
let header = get_header(ptr);
let err = HeapFree(GetProcessHeap(), 0, header.0 as LPVOID);
debug_assert!(err != 0, "Failed to free heap memory: {}",
GetLastError());
}
}
}

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//! This module contains shims around the stdlib HashMap
//! that add fallible methods
//!
//! These methods are a lie. They are not actually fallible. This is just to make
//! it smooth to switch between hashmap impls in a codebase.
use std::hash::{BuildHasher, Hash};
use std::collections::HashMap as StdMap;
use std::collections::HashSet as StdSet;
use std::ops::{Deref, DerefMut};
pub use std::collections::hash_map::{Entry, RandomState};
pub struct HashMap<K, V, S = RandomState>(StdMap<K, V, S>);
use FailedAllocationError;
impl<K, V, S> Deref for HashMap<K, V, S> {
type Target = StdMap<K, V, S>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<K, V, S> DerefMut for HashMap<K, V, S> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<K: Hash + Eq, V> HashMap<K, V, RandomState> {
#[inline]
pub fn new() -> HashMap<K, V, RandomState> {
HashMap(StdMap::new())
}
#[inline]
pub fn with_capacity(capacity: usize) -> HashMap<K, V, RandomState> {
HashMap(StdMap::with_capacity(capacity))
}
#[inline]
pub fn try_with_capacity(capacity: usize) -> Result<HashMap<K, V, RandomState>, FailedAllocationError> {
Ok(HashMap(StdMap::with_capacity(capacity)))
}
}
impl<K, V, S> HashMap<K, V, S>
where K: Eq + Hash,
S: BuildHasher
{
#[inline]
pub fn try_with_hasher(hash_builder: S) -> Result<HashMap<K, V, S>, FailedAllocationError> {
Ok(HashMap(StdMap::with_hasher(hash_builder)))
}
#[inline]
pub fn try_with_capacity_and_hasher(capacity: usize, hash_builder: S) -> Result<HashMap<K, V, S>, FailedAllocationError> {
Ok(HashMap(StdMap::with_capacity_and_hasher(capacity, hash_builder)))
}
pub fn with_capacity_and_hasher(capacity: usize, hash_builder: S) -> HashMap<K, V, S> {
HashMap(StdMap::with_capacity_and_hasher(capacity, hash_builder))
}
#[inline]
pub fn try_reserve(&mut self, additional: usize) -> Result<(), FailedAllocationError> {
Ok(self.reserve(additional))
}
pub fn try_shrink_to_fit(&mut self) -> Result<(), FailedAllocationError> {
Ok(self.shrink_to_fit())
}
pub fn try_entry(&mut self, key: K) -> Result<Entry<K, V>, FailedAllocationError> {
Ok(self.entry(key))
}
#[inline]
pub fn try_insert(&mut self, k: K, v: V) -> Result<Option<V>, FailedAllocationError> {
Ok(self.insert(k, v))
}
}
pub struct HashSet<T, S = RandomState>(StdSet<T, S>);
impl<T, S> Deref for HashSet<T, S> {
type Target = StdSet<T, S>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T, S> DerefMut for HashSet<T, S> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<T: Hash + Eq> HashSet<T, RandomState> {
#[inline]
pub fn new() -> HashSet<T, RandomState> {
HashSet(StdSet::new())
}
#[inline]
pub fn with_capacity(capacity: usize) -> HashSet<T, RandomState> {
HashSet(StdSet::with_capacity(capacity))
}
}
impl<T, S> HashSet<T, S>
where T: Eq + Hash,
S: BuildHasher
{
#[inline]
pub fn with_hasher(hasher: S) -> HashSet<T, S> {
HashSet(StdSet::with_hasher(hasher))
}
#[inline]
pub fn with_capacity_and_hasher(capacity: usize, hasher: S) -> HashSet<T, S> {
HashSet(StdSet::with_capacity_and_hasher(capacity, hasher))
}
#[inline]
pub fn try_reserve(&mut self, additional: usize) -> Result<(), FailedAllocationError> {
Ok(self.reserve(additional))
}
#[inline]
pub fn try_shrink_to_fit(&mut self) -> Result<(), FailedAllocationError> {
Ok(self.shrink_to_fit())
}
#[inline]
pub fn try_insert(&mut self, value: T) -> Result<bool, FailedAllocationError> {
Ok(self.insert(value))
}
}

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pub use std::*;
mod table;
mod shim;
mod alloc;
pub mod hash_map;
pub mod hash_set;
pub mod fake;
use std::{error, fmt};
trait Recover<Q: ?Sized> {
type Key;
fn get(&self, key: &Q) -> Option<&Self::Key>;
fn take(&mut self, key: &Q) -> Option<Self::Key>;
fn replace(&mut self, key: Self::Key) -> Option<Self::Key>;
}
#[derive(Debug)]
pub struct FailedAllocationError {
reason: &'static str,
}
impl error::Error for FailedAllocationError {
fn description(&self) -> &str {
self.reason
}
}
impl fmt::Display for FailedAllocationError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.reason.fmt(f)
}
}

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use std::marker::PhantomData;
pub struct NonZeroPtr<T: 'static>(&'static T);
impl<T: 'static> NonZeroPtr<T> {
pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
NonZeroPtr(&*ptr)
}
pub fn as_ptr(&self) -> *mut T {
self.0 as *const T as *mut T
}
}
pub struct Unique<T: 'static> {
ptr: NonZeroPtr<T>,
_marker: PhantomData<T>,
}
impl<T: 'static> Unique<T> {
pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
Unique {
ptr: NonZeroPtr::new_unchecked(ptr),
_marker: PhantomData,
}
}
pub fn as_ptr(&self) -> *mut T {
self.ptr.as_ptr()
}
}
unsafe impl<T: Send + 'static> Send for Unique<T> { }
unsafe impl<T: Sync + 'static> Sync for Unique<T> { }
pub struct Shared<T: 'static> {
ptr: NonZeroPtr<T>,
_marker: PhantomData<T>,
// force it to be !Send/!Sync
_marker2: PhantomData<*const u8>,
}
impl<T: 'static> Shared<T> {
pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
Shared {
ptr: NonZeroPtr::new_unchecked(ptr),
_marker: PhantomData,
_marker2: PhantomData,
}
}
pub unsafe fn as_mut(&self) -> &mut T {
&mut *self.ptr.as_ptr()
}
}
impl<'a, T> From<&'a mut T> for Shared<T> {
fn from(reference: &'a mut T) -> Self {
unsafe { Shared::new_unchecked(reference) }
}
}

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