#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/SwapByteOrder.h"
#include "llvm/Support/type_traits.h"
#include <algorithm>
#include <cassert>
/// differing argument types even if they would implicit promote to a common
/// type without changing the value.
template <typename T>
-typename enable_if<is_integral<T>, hash_code>::type hash_value(T value);
+typename enable_if<is_integral_or_enum<T>, hash_code>::type hash_value(T value);
/// \brief Compute a hash_code for a pointer's address.
///
template <typename T, typename U>
hash_code hash_value(const std::pair<T, U> &arg);
+/// \brief Compute a hash_code for a standard string.
+template <typename T>
+hash_code hash_value(const std::basic_string<T> &arg);
+
/// \brief Override the execution seed with a fixed value.
///
inline uint64_t fetch64(const char *p) {
uint64_t result;
memcpy(&result, p, sizeof(result));
+ if (sys::isBigEndianHost())
+ return sys::SwapByteOrder(result);
return result;
}
inline uint32_t fetch32(const char *p) {
uint32_t result;
memcpy(&result, p, sizeof(result));
+ if (sys::isBigEndianHost())
+ return sys::SwapByteOrder(result);
return result;
}
/// \brief Bitwise right rotate.
/// Normally this will compile to a single instruction, especially if the
/// shift is a manifest constant.
-inline uint64_t rotate(uint64_t val, unsigned shift) {
+inline uint64_t rotate(uint64_t val, size_t shift) {
// Avoid shifting by 64: doing so yields an undefined result.
return shift == 0 ? val : ((val >> shift) | (val << (64 - shift)));
}
}
inline uint64_t hash_9to16_bytes(const char *s, size_t len, uint64_t seed) {
- uint64_t a = fetch64(s);
- uint64_t b = fetch64(s + len - 8);
- return hash_16_bytes(seed ^ a, rotate(b + len, len)) ^ b;
+ uint64_t a = fetch64(s);
+ uint64_t b = fetch64(s + len - 8);
+ return hash_16_bytes(seed ^ a, rotate(b + len, len)) ^ b;
}
inline uint64_t hash_17to32_bytes(const char *s, size_t len, uint64_t seed) {
static hash_state create(const char *s, uint64_t seed) {
hash_state state = {
0, seed, hash_16_bytes(seed, k1), rotate(seed ^ k1, 49),
- seed * k1, shift_mix(seed), hash_16_bytes(state.h4, state.h5),
- seed
- };
+ seed * k1, shift_mix(seed), 0, seed };
+ state.h6 = hash_16_bytes(state.h4, state.h5);
state.mix(s);
return state;
}
// called, return that instead of the per-execution seed.
const uint64_t seed_prime = 0xff51afd7ed558ccdULL;
static size_t seed = fixed_seed_override ? fixed_seed_override
- : static_cast<size_t>(seed_prime);
+ : (size_t)seed_prime;
return seed;
}
/// reading the underlying data. It is false if values of this type must
/// first be passed to hash_value, and the resulting hash_codes combined.
//
-// FIXME: We want to replace is_integral and is_pointer here with a predicate
-// which asserts that comparing the underlying storage of two values of the
-// type for equality is equivalent to comparing the two values for equality.
-// For all the platforms we care about, this holds for integers and pointers,
-// but there are platforms where it doesn't and we would like to support
-// user-defined types which happen to satisfy this property.
+// FIXME: We want to replace is_integral_or_enum and is_pointer here with
+// a predicate which asserts that comparing the underlying storage of two
+// values of the type for equality is equivalent to comparing the two values
+// for equality. For all the platforms we care about, this holds for integers
+// and pointers, but there are platforms where it doesn't and we would like to
+// support user-defined types which happen to satisfy this property.
template <typename T> struct is_hashable_data
- : integral_constant<bool, ((is_integral<T>::value || is_pointer<T>::value) &&
+ : integral_constant<bool, ((is_integral_or_enum<T>::value ||
+ is_pointer<T>::value) &&
64 % sizeof(T) == 0)> {};
// Special case std::pair to detect when both types are viable and when there
while (first != last && store_and_advance(buffer_ptr, buffer_end,
get_hashable_data(*first)))
++first;
-/// \brief Metafunction that determines whether the given type is an integral
-/// type.
if (first == last)
return hash_short(buffer, buffer_ptr - buffer, seed);
assert(buffer_ptr == buffer_end);
/// and directly reads from the underlying memory.
template <typename ValueT>
typename enable_if<is_hashable_data<ValueT>, hash_code>::type
-hash_combine_range_impl(const ValueT *first, const ValueT *last) {
+hash_combine_range_impl(ValueT *first, ValueT *last) {
const size_t seed = get_execution_seed();
const char *s_begin = reinterpret_cast<const char *>(first);
const char *s_end = reinterpret_cast<const char *>(last);
// Declared and documented above, but defined here so that any of the hashing
// infrastructure is available.
template <typename T>
-typename enable_if<is_integral<T>, hash_code>::type hash_value(T value) {
+typename enable_if<is_integral_or_enum<T>, hash_code>::type
+hash_value(T value) {
return ::llvm::hashing::detail::hash_integer_value(value);
}
return hash_combine(arg.first, arg.second);
}
+// Declared and documented above, but defined here so that any of the hashing
+// infrastructure is available.
+template <typename T>
+hash_code hash_value(const std::basic_string<T> &arg) {
+ return hash_combine_range(arg.begin(), arg.end());
+}
+
} // namespace llvm
#endif
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