llvm::hashing::detail::hash_state Struct Reference

The intermediate state used during hashing. Currently, the algorithm for computing hash codes is based on CityHash and keeps 56 bytes of arbitrary state. More...

#include <Hashing.h>

Collaboration diagram for llvm::hashing::detail::hash_state:

List of all members.

Public Member Functions
void	mix (const char *s)
	Mix in a 64-byte buffer of data. We mix all 64 bytes even when the chunk length is smaller, but we record the actual length.
uint64_t	finalize (size_t length)
	Compute the final 64-bit hash code value based on the current state and the length of bytes hashed.
Static Public Member Functions
static hash_state	create (const char *s, uint64_t seed)
	Create a new hash_state structure and initialize it based on the seed and the first 64-byte chunk. This effectively performs the initial mix.
static void	mix_32_bytes (const char *s, uint64_t &a, uint64_t &b)
	Mix 32-bytes from the input sequence into the 16-bytes of 'a' and 'b', including whatever is already in 'a' and 'b'.
Public Attributes
uint64_t	h0
uint64_t	h1
uint64_t	h2
uint64_t	h3
uint64_t	h4
uint64_t	h5
uint64_t	h6

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Detailed Description

The intermediate state used during hashing. Currently, the algorithm for computing hash codes is based on CityHash and keeps 56 bytes of arbitrary state.

Definition at line 266 of file Hashing.h.

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Member Function Documentation

static hash_state llvm::hashing::detail::hash_state::create	(	const char *	s,
		uint64_t	seed
	)		[inline, static]

Create a new hash_state structure and initialize it based on the seed and the first 64-byte chunk. This effectively performs the initial mix.

Definition at line 272 of file Hashing.h.

References h4, h5, h6, llvm::hashing::detail::hash_16_bytes(), llvm::hashing::detail::k1, mix(), llvm::hashing::detail::rotate(), and llvm::hashing::detail::shift_mix().

Referenced by llvm::hashing::detail::hash_combine_recursive_helper::combine_data(), and llvm::hashing::detail::hash_combine_range_impl().

uint64_t llvm::hashing::detail::hash_state::finalize

(

size_t

length

)

[inline]

Compute the final 64-bit hash code value based on the current state and the length of bytes hashed.

Definition at line 313 of file Hashing.h.

References h0, h1, h2, h3, h4, h5, h6, llvm::hashing::detail::hash_16_bytes(), llvm::hashing::detail::k1, and llvm::hashing::detail::shift_mix().

Referenced by llvm::hashing::detail::hash_combine_recursive_helper::combine(), and llvm::hashing::detail::hash_combine_range_impl().

void llvm::hashing::detail::hash_state::mix

(

const char *

s

)

[inline]

Mix in a 64-byte buffer of data. We mix all 64 bytes even when the chunk length is smaller, but we record the actual length.

Definition at line 296 of file Hashing.h.

References llvm::hashing::detail::fetch64(), h0, h1, h2, h3, h4, h5, h6, llvm::hashing::detail::k1, mix_32_bytes(), llvm::hashing::detail::rotate(), and std::swap().

Referenced by llvm::hashing::detail::hash_combine_recursive_helper::combine(), llvm::hashing::detail::hash_combine_recursive_helper::combine_data(), create(), and llvm::hashing::detail::hash_combine_range_impl().

static void llvm::hashing::detail::hash_state::mix_32_bytes	(	const char *	s,
		uint64_t &	a,
		uint64_t &	b
	)		[inline, static]

Mix 32-bytes from the input sequence into the 16-bytes of 'a' and 'b', including whatever is already in 'a' and 'b'.

Definition at line 283 of file Hashing.h.

References llvm::hashing::detail::fetch64(), and llvm::hashing::detail::rotate().

Referenced by mix().

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Member Data Documentation

uint64_t llvm::hashing::detail::hash_state::h0

Definition at line 267 of file Hashing.h.

Referenced by finalize(), and mix().

uint64_t llvm::hashing::detail::hash_state::h1

Definition at line 267 of file Hashing.h.

Referenced by finalize(), and mix().

uint64_t llvm::hashing::detail::hash_state::h2

Definition at line 267 of file Hashing.h.

Referenced by finalize(), and mix().

uint64_t llvm::hashing::detail::hash_state::h3

Definition at line 267 of file Hashing.h.

Referenced by finalize(), and mix().

uint64_t llvm::hashing::detail::hash_state::h4

Definition at line 267 of file Hashing.h.

Referenced by create(), finalize(), and mix().

uint64_t llvm::hashing::detail::hash_state::h5

Definition at line 267 of file Hashing.h.

Referenced by create(), finalize(), and mix().

uint64_t llvm::hashing::detail::hash_state::h6

Definition at line 267 of file Hashing.h.

Referenced by create(), finalize(), and mix().

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The documentation for this struct was generated from the following file:

• Hashing.h