Move hash module from collections to core

3 files changed, 386 insertions, 1 deletions

diff --git a/src/libcoretest/hash/mod.rs b/src/libcoretest/hash/mod.rs
new file mode 100644
index 00000000000..23f9be124da
--- /dev/null
+++ b/src/libcoretest/hash/mod.rs
@@ -0,0 +1,101 @@
+// Copyright 2014 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.
+use core::kinds::Sized;
+use std::mem;
+
+use core::slice::SliceExt;
+use core::hash::{Hash, Hasher, Writer};
+
+struct MyWriterHasher;
+
+impl Hasher<MyWriter> for MyWriterHasher {
+    fn hash<Sized? T: Hash<MyWriter>>(&self, value: &T) -> u64 {
+        let mut state = MyWriter { hash: 0 };
+        value.hash(&mut state);
+        state.hash
+    }
+}
+
+struct MyWriter {
+    hash: u64,
+}
+
+impl Writer for MyWriter {
+    // Most things we'll just add up the bytes.
+    fn write(&mut self, buf: &[u8]) {
+        for byte in buf.iter() {
+            self.hash += *byte as u64;
+        }
+    }
+}
+
+#[test]
+fn test_writer_hasher() {
+    let hasher = MyWriterHasher;
+
+    assert_eq!(hasher.hash(&()), 0);
+
+    assert_eq!(hasher.hash(&5u8), 5);
+    assert_eq!(hasher.hash(&5u16), 5);
+    assert_eq!(hasher.hash(&5u32), 5);
+    assert_eq!(hasher.hash(&5u64), 5);
+    assert_eq!(hasher.hash(&5u), 5);
+
+    assert_eq!(hasher.hash(&5i8), 5);
+    assert_eq!(hasher.hash(&5i16), 5);
+    assert_eq!(hasher.hash(&5i32), 5);
+    assert_eq!(hasher.hash(&5i64), 5);
+    assert_eq!(hasher.hash(&5i), 5);
+
+    assert_eq!(hasher.hash(&false), 0);
+    assert_eq!(hasher.hash(&true), 1);
+
+    assert_eq!(hasher.hash(&'a'), 97);
+
+    let s: &str = "a";
+    assert_eq!(hasher.hash(& s), 97 + 0xFF);
+    // FIXME (#18283) Enable test
+    //let s: Box<str> = box "a";
+    //assert_eq!(hasher.hash(& s), 97 + 0xFF);
+    let cs: &[u8] = &[1u8, 2u8, 3u8];
+    assert_eq!(hasher.hash(& cs), 9);
+    let cs: Box<[u8]> = box [1u8, 2u8, 3u8];
+    assert_eq!(hasher.hash(& cs), 9);
+
+    // FIXME (#18248) Add tests for hashing Rc<str> and Rc<[T]>
+
+    unsafe {
+        let ptr: *const int = mem::transmute(5i);
+        assert_eq!(hasher.hash(&ptr), 5);
+    }
+
+    unsafe {
+        let ptr: *mut int = mem::transmute(5i);
+        assert_eq!(hasher.hash(&ptr), 5);
+    }
+}
+
+struct Custom {
+    hash: u64
+}
+
+impl Hash<u64> for Custom {
+    fn hash(&self, state: &mut u64) {
+        *state = self.hash;
+    }
+}
+
+#[test]
+fn test_custom_state() {
+    let custom = Custom { hash: 5 };
+    let mut state = 0;
+    custom.hash(&mut state);
+    assert_eq!(state, 5);
+}
diff --git a/src/libcoretest/hash/sip.rs b/src/libcoretest/hash/sip.rs
new file mode 100644
index 00000000000..8801c2975c8
--- /dev/null
+++ b/src/libcoretest/hash/sip.rs
@@ -0,0 +1,283 @@
+// Copyright 2014 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.
+use test::Bencher;
+use std::prelude::*;
+use std::fmt;
+
+use str::Str;
+use string::String;
+use slice::{AsSlice, SlicePrelude};
+use vec::Vec;
+
+use core::hash::{Hash, Writer};
+use core::hash::sip::{SipState, hash, hash_with_keys};
+
+// Hash just the bytes of the slice, without length prefix
+struct Bytes<'a>(&'a [u8]);
+
+impl<'a, S: Writer> Hash<S> for Bytes<'a> {
+    #[allow(unused_must_use)]
+    fn hash(&self, state: &mut S) {
+        let Bytes(v) = *self;
+        state.write(v);
+    }
+}
+
+#[test]
+#[allow(unused_must_use)]
+fn test_siphash() {
+    let vecs : [[u8, ..8], ..64] = [
+        [ 0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72, ],
+        [ 0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74, ],
+        [ 0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d, ],
+        [ 0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85, ],
+        [ 0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf, ],
+        [ 0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18, ],
+        [ 0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb, ],
+        [ 0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab, ],
+        [ 0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93, ],
+        [ 0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e, ],
+        [ 0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a, ],
+        [ 0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4, ],
+        [ 0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75, ],
+        [ 0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14, ],
+        [ 0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7, ],
+        [ 0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1, ],
+        [ 0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f, ],
+        [ 0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69, ],
+        [ 0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b, ],
+        [ 0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb, ],
+        [ 0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe, ],
+        [ 0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0, ],
+        [ 0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93, ],
+        [ 0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8, ],
+        [ 0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8, ],
+        [ 0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc, ],
+        [ 0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17, ],
+        [ 0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f, ],
+        [ 0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde, ],
+        [ 0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6, ],
+        [ 0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad, ],
+        [ 0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32, ],
+        [ 0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71, ],
+        [ 0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7, ],
+        [ 0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12, ],
+        [ 0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15, ],
+        [ 0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31, ],
+        [ 0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02, ],
+        [ 0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca, ],
+        [ 0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a, ],
+        [ 0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e, ],
+        [ 0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad, ],
+        [ 0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18, ],
+        [ 0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4, ],
+        [ 0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9, ],
+        [ 0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9, ],
+        [ 0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb, ],
+        [ 0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0, ],
+        [ 0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6, ],
+        [ 0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7, ],
+        [ 0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee, ],
+        [ 0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1, ],
+        [ 0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a, ],
+        [ 0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81, ],
+        [ 0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f, ],
+        [ 0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24, ],
+        [ 0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7, ],
+        [ 0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea, ],
+        [ 0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60, ],
+        [ 0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66, ],
+        [ 0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c, ],
+        [ 0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f, ],
+        [ 0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5, ],
+        [ 0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95, ]
+    ];
+
+    let k0 = 0x_07_06_05_04_03_02_01_00_u64;
+    let k1 = 0x_0f_0e_0d_0c_0b_0a_09_08_u64;
+    let mut buf = Vec::new();
+    let mut t = 0;
+    let mut state_inc = SipState::new_with_keys(k0, k1);
+    let mut state_full = SipState::new_with_keys(k0, k1);
+
+    fn to_hex_str(r: &[u8, ..8]) -> String {
+        let mut s = String::new();
+        for b in r.iter() {
+            s.push_str(format!("{}", fmt::radix(*b, 16)).as_slice());
+        }
+        s
+    }
+
+    fn result_bytes(h: u64) -> Vec<u8> {
+        vec![(h >> 0) as u8,
+          (h >> 8) as u8,
+          (h >> 16) as u8,
+          (h >> 24) as u8,
+          (h >> 32) as u8,
+          (h >> 40) as u8,
+          (h >> 48) as u8,
+          (h >> 56) as u8,
+        ]
+    }
+
+    fn result_str(h: u64) -> String {
+        let r = result_bytes(h);
+        let mut s = String::new();
+        for b in r.iter() {
+            s.push_str(format!("{}", fmt::radix(*b, 16)).as_slice());
+        }
+        s
+    }
+
+    while t < 64 {
+        debug!("siphash test {}: {}", t, buf);
+        let vec = u8to64_le!(vecs[t], 0);
+        let out = hash_with_keys(k0, k1, &Bytes(buf.as_slice()));
+        debug!("got {}, expected {}", out, vec);
+        assert_eq!(vec, out);
+
+        state_full.reset();
+        state_full.write(buf.as_slice());
+        let f = result_str(state_full.result());
+        let i = result_str(state_inc.result());
+        let v = to_hex_str(&vecs[t]);
+        debug!("{}: ({}) => inc={} full={}", t, v, i, f);
+
+        assert_eq!(f, i);
+        assert_eq!(f, v);
+
+        buf.push(t as u8);
+        state_inc.write(&[t as u8]);
+
+        t += 1;
+    }
+}
+
+#[test] #[cfg(target_arch = "arm")]
+fn test_hash_uint() {
+    let val = 0xdeadbeef_deadbeef_u64;
+    assert!(hash(&(val as u64)) != hash(&(val as uint)));
+    assert_eq!(hash(&(val as u32)), hash(&(val as uint)));
+}
+#[test] #[cfg(target_arch = "x86_64")]
+fn test_hash_uint() {
+    let val = 0xdeadbeef_deadbeef_u64;
+    assert_eq!(hash(&(val as u64)), hash(&(val as uint)));
+    assert!(hash(&(val as u32)) != hash(&(val as uint)));
+}
+#[test] #[cfg(target_arch = "x86")]
+fn test_hash_uint() {
+    let val = 0xdeadbeef_deadbeef_u64;
+    assert!(hash(&(val as u64)) != hash(&(val as uint)));
+    assert_eq!(hash(&(val as u32)), hash(&(val as uint)));
+}
+
+#[test]
+fn test_hash_idempotent() {
+    let val64 = 0xdeadbeef_deadbeef_u64;
+    assert_eq!(hash(&val64), hash(&val64));
+    let val32 = 0xdeadbeef_u32;
+    assert_eq!(hash(&val32), hash(&val32));
+}
+
+#[test]
+fn test_hash_no_bytes_dropped_64() {
+    let val = 0xdeadbeef_deadbeef_u64;
+
+    assert!(hash(&val) != hash(&zero_byte(val, 0)));
+    assert!(hash(&val) != hash(&zero_byte(val, 1)));
+    assert!(hash(&val) != hash(&zero_byte(val, 2)));
+    assert!(hash(&val) != hash(&zero_byte(val, 3)));
+    assert!(hash(&val) != hash(&zero_byte(val, 4)));
+    assert!(hash(&val) != hash(&zero_byte(val, 5)));
+    assert!(hash(&val) != hash(&zero_byte(val, 6)));
+    assert!(hash(&val) != hash(&zero_byte(val, 7)));
+
+    fn zero_byte(val: u64, byte: uint) -> u64 {
+        assert!(byte < 8);
+        val & !(0xff << (byte * 8))
+    }
+}
+
+#[test]
+fn test_hash_no_bytes_dropped_32() {
+    let val = 0xdeadbeef_u32;
+
+    assert!(hash(&val) != hash(&zero_byte(val, 0)));
+    assert!(hash(&val) != hash(&zero_byte(val, 1)));
+    assert!(hash(&val) != hash(&zero_byte(val, 2)));
+    assert!(hash(&val) != hash(&zero_byte(val, 3)));
+
+    fn zero_byte(val: u32, byte: uint) -> u32 {
+        assert!(byte < 4);
+        val & !(0xff << (byte * 8))
+    }
+}
+
+#[test]
+fn test_hash_no_concat_alias() {
+    let s = ("aa", "bb");
+    let t = ("aabb", "");
+    let u = ("a", "abb");
+
+    assert!(s != t && t != u);
+    assert!(hash(&s) != hash(&t) && hash(&s) != hash(&u));
+
+    let v: (&[u8], &[u8], &[u8]) = (&[1u8], &[0u8, 0], &[0u8]);
+    let w: (&[u8], &[u8], &[u8]) = (&[1u8, 0, 0, 0], &[], &[]);
+
+    assert!(v != w);
+    assert!(hash(&v) != hash(&w));
+}
+
+#[bench]
+fn bench_str_under_8_bytes(b: &mut Bencher) {
+    let s = "foo";
+    b.iter(|| {
+        assert_eq!(hash(&s), 16262950014981195938);
+    })
+}
+
+#[bench]
+fn bench_str_of_8_bytes(b: &mut Bencher) {
+    let s = "foobar78";
+    b.iter(|| {
+        assert_eq!(hash(&s), 4898293253460910787);
+    })
+}
+
+#[bench]
+fn bench_str_over_8_bytes(b: &mut Bencher) {
+    let s = "foobarbaz0";
+    b.iter(|| {
+        assert_eq!(hash(&s), 10581415515220175264);
+    })
+}
+
+#[bench]
+fn bench_long_str(b: &mut Bencher) {
+    let s = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor \
+incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud \
+exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute \
+irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla \
+pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui \
+officia deserunt mollit anim id est laborum.";
+    b.iter(|| {
+        assert_eq!(hash(&s), 17717065544121360093);
+    })
+}
+
+#[bench]
+fn bench_u64(b: &mut Bencher) {
+    let u = 16262950014981195938u64;
+    b.iter(|| {
+        assert_eq!(hash(&u), 5254097107239593357);
+    })
+}
diff --git a/src/libcoretest/lib.rs b/src/libcoretest/lib.rs
index 089a2cc880e..05d862d7bc7 100644
--- a/src/libcoretest/lib.rs
+++ b/src/libcoretest/lib.rs
@@ -7,7 +7,7 @@
 // <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.
-#![feature(globs, unsafe_destructor, macro_rules, slicing_syntax)]
+#![feature(globs, unsafe_destructor, macro_rules, slicing_syntax, default_type_params)]
 #![feature(unboxed_closures)]
 
 extern crate core;
@@ -21,6 +21,7 @@ mod char;
 mod cmp;
 mod finally;
 mod fmt;
+mod hash;
 mod iter;
 mod mem;
 mod num;