memory

package
v0.9.1 Latest Latest
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 Go to latest Published: Jun 4, 2023 License: MIT Imports: 5 Imported by: 1

Documentation

Index

Constants

View Source 
const PtrSize = 4 << (^uintptr(0) >> 63)

PtrSize is the size of a pointer in bytes - unsafe.Sizeof(uintptr(0)) but as an ideal constant. It is also the size of the machine's native word size (that is, 4 on 32-bit systems, 8 on 64-bit).

Variables

View Source 
var ArrowAllocator arrowAllocator

Functions

func Cmp 

func Cmp(a, b string) int

func Compare 

func Compare(a, b unsafe.Pointer, n uintptr) int

func Copy 

func Copy(dst, src unsafe.Pointer, n uintptr)

func Equals 

func Equals(a, b unsafe.Pointer, size uintptr) bool

func Fastrand 

func Fastrand() uint32

func FloorToPowerOfTwo 

func FloorToPowerOfTwo(n int) int

FloorToPowerOfTwo returns the greatest power of two integer value less than or equal to n.

func Free 

func Free(p Pointer)

Free calls Free on the system allocator

func GCAlloc 

func GCAlloc(size uintptr) unsafe.Pointer

func GCAllocZeroed 

func GCAllocZeroed(size uintptr) unsafe.Pointer

func Init 

func Init()

func Int16LE 

func Int16LE(p unsafe.Pointer) int16

func IsPowerOfTwo 

func IsPowerOfTwo(n int) bool

IsPowerOfTwo reports whether given integer is a power of two.

func LogarithmicRange 

func LogarithmicRange(min, max int, cb func(int))

LogarithmicRange iterates from ceiled to power of two min to max, calling cb on each iteration.

func Move 

func Move(to, from unsafe.Pointer, n uintptr)

Move copies n bytes from "from" to "to".

Move ensures that any pointer in "from" is written to "to" with an indivisible write, so that racy reads cannot observe a half-written pointer. This is necessary to prevent the garbage collector from observing invalid pointers, and differs from Memmove in unmanaged languages. However, Memmove is only required to do this if "from" and "to" may contain pointers, which can only be the case if "from", "to", and "n" are all be word-aligned.

Implementations are in memmove_*.s.

func Sizeof 

func Sizeof(ptr Pointer) uintptr

func Uint16LE 

func Uint16LE(p unsafe.Pointer) uint16

func Zero 

func Zero(ptr unsafe.Pointer, n uintptr)

Zero clears n bytes starting at ptr.

Usually you should use typedmemclr. memclrNoHeapPointers should be used only when the caller knows that *ptr contains no heap pointers because either:

*ptr is initialized memory and its type is pointer-free, or

*ptr is uninitialized memory (e.g., memory that's being reused for a new allocation) and hence contains only "junk".

memclrNoHeapPointers ensures that if ptr is pointer-aligned, and n is a multiple of the pointer size, then any pointer-aligned, pointer-sized portion is cleared atomically. Despite the function name, this is necessary because this function is the underlying implementation of typedmemclr and memclrHasPointers. See the doc of Memmove for more details.

The (CPU-specific) implementations of this function are in memclr_*.s.

Types

type Bytes 

type Bytes struct {
	Pointer
	Size uintptr
}

type Pointer 

type Pointer uintptr

Pointer is a wrapper around a raw pointer that is not unsafe.Pointer so Go won't confuse it for a potential GC managed pointer.

func Alloc 

func Alloc(size uintptr) Pointer

Alloc calls Alloc on the system allocator

func AllocCap 

func AllocCap(size uintptr) (Pointer, uintptr)

func AllocZeroed 

func AllocZeroed(size uintptr) Pointer

func AllocZeroedCap 

func AllocZeroedCap(size uintptr) (Pointer, uintptr)

func Calloc 

func Calloc(num, size uintptr) Pointer

Alloc calls Alloc on the system allocator

func CallocCap 

func CallocCap(num, size uintptr) (Pointer, uintptr)

func PointerOfString 

func PointerOfString(s string) Pointer

func Realloc 

func Realloc(p Pointer, size uintptr) Pointer

Realloc calls Realloc on the system allocator

func ReallocCap 

func ReallocCap(p Pointer, size uintptr) (Pointer, uintptr)

func (Pointer) Add 

func (p Pointer) Add(offset int) Pointer

Add is Pointer arithmetic.

func (Pointer) AsFloat32BE 

func (p Pointer) AsFloat32BE() float32

func (Pointer) AsFloat32LE 

func (p Pointer) AsFloat32LE() float32

func (Pointer) AsFloat64BE 

func (p Pointer) AsFloat64BE() float64

func (Pointer) AsFloat64LE 

func (p Pointer) AsFloat64LE() float64

func (Pointer) AsInt16BE 

func (p Pointer) AsInt16BE() int16

func (Pointer) AsInt16LE 

func (p Pointer) AsInt16LE() int16

func (Pointer) AsInt32BE 

func (p Pointer) AsInt32BE() int32

func (Pointer) AsInt32LE 

func (p Pointer) AsInt32LE() int32

func (Pointer) AsInt64BE 

func (p Pointer) AsInt64BE() int64

func (Pointer) AsInt64LE 

func (p Pointer) AsInt64LE() int64

func (Pointer) AsUint16BE 

func (p Pointer) AsUint16BE() uint16

func (Pointer) AsUint16LE 

func (p Pointer) AsUint16LE() uint16

func (Pointer) AsUint32BE 

func (p Pointer) AsUint32BE() uint32

func (Pointer) AsUint32LE 

func (p Pointer) AsUint32LE() uint32

func (Pointer) AsUint64BE 

func (p Pointer) AsUint64BE() uint64

func (Pointer) AsUint64LE 

func (p Pointer) AsUint64LE() uint64

func (Pointer) Byte 

func (p Pointer) Byte(offset int) byte

func (Pointer) Bytes 

func (p Pointer) Bytes(offset, length, capacity int) []byte

func (Pointer) Clone 

func (p Pointer) Clone(offset, size int) Pointer

Clone the memory starting at offset for size number of bytes and return the new Pointer.

func (Pointer) Compare 

func (p Pointer) Compare(offset, size int, to Pointer) int

func (Pointer) Copy 

func (p Pointer) Copy(offset, size int, to Pointer)

func (Pointer) Equals 

func (p Pointer) Equals(offset, size int, to Pointer) bool

func (Pointer) Float32 

func (p Pointer) Float32(offset int) float32

func (Pointer) Float32BE 

func (p Pointer) Float32BE(offset int) float32

func (Pointer) Float32LE 

func (p Pointer) Float32LE(offset int) float32

func (Pointer) Float64 

func (p Pointer) Float64(offset int) float64

func (Pointer) Float64BE 

func (p Pointer) Float64BE(offset int) float64

func (Pointer) Float64LE 

func (p Pointer) Float64LE(offset int) float64

func (*Pointer) Free 

func (p *Pointer) Free()

Free deallocates memory pointed by Pointer

func (Pointer) Hash64 

func (p Pointer) Hash64(length int) uint64

func (Pointer) Hash64At 

func (p Pointer) Hash64At(offset, length int) uint64

func (Pointer) Int 

func (p Pointer) Int(offset int) int

func (Pointer) Int16 

func (p Pointer) Int16(offset int) int16

func (Pointer) Int16BE 

func (p Pointer) Int16BE(offset int) int16

func (Pointer) Int16LE 

func (p Pointer) Int16LE(offset int) int16

func (Pointer) Int24 

func (p Pointer) Int24(offset int) int32

func (Pointer) Int24BE 

func (p Pointer) Int24BE(offset int) int32

func (Pointer) Int24LE 

func (p Pointer) Int24LE(offset int) int32

func (Pointer) Int32 

func (p Pointer) Int32(offset int) int32

func (Pointer) Int32Alt 

func (p Pointer) Int32Alt(offset uintptr) int32

func (Pointer) Int32BE 

func (p Pointer) Int32BE(offset int) int32

func (Pointer) Int32LE 

func (p Pointer) Int32LE(offset int) int32

func (Pointer) Int40 

func (p Pointer) Int40(offset int) int64

func (Pointer) Int40BE 

func (p Pointer) Int40BE(offset int) int64

func (Pointer) Int40LE 

func (p Pointer) Int40LE(offset int) int64

func (Pointer) Int48 

func (p Pointer) Int48(offset int) int64

func (Pointer) Int48BE 

func (p Pointer) Int48BE(offset int) int64

func (Pointer) Int48LE 

func (p Pointer) Int48LE(offset int) int64

func (Pointer) Int56 

func (p Pointer) Int56(offset int) int64

func (Pointer) Int56BE 

func (p Pointer) Int56BE(offset int) int64

func (Pointer) Int56LE 

func (p Pointer) Int56LE(offset int) int64

func (Pointer) Int64 

func (p Pointer) Int64(offset int) int64

func (Pointer) Int64BE 

func (p Pointer) Int64BE(offset int) int64

func (Pointer) Int64LE 

func (p Pointer) Int64LE(offset int) int64

func (Pointer) Int8 

func (p Pointer) Int8(offset int) int8

func (Pointer) Move 

func (p Pointer) Move(offset, size int, to Pointer)

func (Pointer) Pointer 

func (p Pointer) Pointer(offset int) Pointer

func (Pointer) SetByte 

func (p Pointer) SetByte(offset int, v byte)

func (Pointer) SetBytes 

func (p Pointer) SetBytes(offset int, value []byte)

func (Pointer) SetFloat32 

func (p Pointer) SetFloat32(offset int, v float32)

func (Pointer) SetFloat32BE 

func (p Pointer) SetFloat32BE(offset int, v float32)

func (Pointer) SetFloat32LE 

func (p Pointer) SetFloat32LE(offset int, v float32)

func (Pointer) SetFloat64 

func (p Pointer) SetFloat64(offset int, v float64)

func (Pointer) SetFloat64BE 

func (p Pointer) SetFloat64BE(offset int, v float64)

func (Pointer) SetFloat64LE 

func (p Pointer) SetFloat64LE(offset int, v float64)

func (Pointer) SetInt 

func (p Pointer) SetInt(offset int, v int)

func (Pointer) SetInt16 

func (p Pointer) SetInt16(offset int, v int16)

func (Pointer) SetInt16BE 

func (p Pointer) SetInt16BE(offset int, v int16)

func (Pointer) SetInt16LE 

func (p Pointer) SetInt16LE(offset int, v int16)

func (Pointer) SetInt24 

func (p Pointer) SetInt24(offset int, v int32)

func (Pointer) SetInt24BE 

func (p Pointer) SetInt24BE(offset int, v int32)

func (Pointer) SetInt24LE 

func (p Pointer) SetInt24LE(offset int, v int32)

func (Pointer) SetInt32 

func (p Pointer) SetInt32(offset int, v int32)

func (Pointer) SetInt32BE 

func (p Pointer) SetInt32BE(offset int, v int32)

func (Pointer) SetInt32LE 

func (p Pointer) SetInt32LE(offset int, v int32)

func (Pointer) SetInt40 

func (p Pointer) SetInt40(offset int, v int64)

func (Pointer) SetInt40BE 

func (p Pointer) SetInt40BE(offset int, v int64)

func (Pointer) SetInt40LE 

func (p Pointer) SetInt40LE(offset int, v int64)

func (Pointer) SetInt48 

func (p Pointer) SetInt48(offset int, v int64)

func (Pointer) SetInt48BE 

func (p Pointer) SetInt48BE(offset int, v int64)

func (Pointer) SetInt48LE 

func (p Pointer) SetInt48LE(offset int, v int64)

func (Pointer) SetInt56 

func (p Pointer) SetInt56(offset int, v int64)

func (Pointer) SetInt56BE 

func (p Pointer) SetInt56BE(offset int, v int64)

func (Pointer) SetInt56LE 

func (p Pointer) SetInt56LE(offset int, v int64)

func (Pointer) SetInt64 

func (p Pointer) SetInt64(offset int, v int64)

func (Pointer) SetInt64BE 

func (p Pointer) SetInt64BE(offset int, v int64)

func (Pointer) SetInt64LE 

func (p Pointer) SetInt64LE(offset int, v int64)

func (Pointer) SetInt8 

func (p Pointer) SetInt8(offset int, v int8)

func (Pointer) SetPointer 

func (p Pointer) SetPointer(offset int, v Pointer)

func (Pointer) SetString 

func (p Pointer) SetString(offset int, value string)

func (Pointer) SetUint 

func (p Pointer) SetUint(offset int, v uint)

func (Pointer) SetUint16 

func (p Pointer) SetUint16(offset int, v uint16)

func (Pointer) SetUint16BE 

func (p Pointer) SetUint16BE(offset int, v uint16)

func (Pointer) SetUint16LE 

func (p Pointer) SetUint16LE(offset int, v uint16)

func (Pointer) SetUint24 

func (p Pointer) SetUint24(offset int, v uint32)

func (Pointer) SetUint24BE 

func (p Pointer) SetUint24BE(offset int, v uint32)

func (Pointer) SetUint24LE 

func (p Pointer) SetUint24LE(offset int, v uint32)

func (Pointer) SetUint32 

func (p Pointer) SetUint32(offset int, v uint32)

func (Pointer) SetUint32BE 

func (p Pointer) SetUint32BE(offset int, v uint32)

func (Pointer) SetUint32LE 

func (p Pointer) SetUint32LE(offset int, v uint32)

func (Pointer) SetUint40 

func (p Pointer) SetUint40(offset int, v uint64)

func (Pointer) SetUint40BE 

func (p Pointer) SetUint40BE(offset int, v uint64)

func (Pointer) SetUint40LE 

func (p Pointer) SetUint40LE(offset int, v uint64)

func (Pointer) SetUint48 

func (p Pointer) SetUint48(offset int, v uint64)

func (Pointer) SetUint48BE 

func (p Pointer) SetUint48BE(offset int, v uint64)

func (Pointer) SetUint48LE 

func (p Pointer) SetUint48LE(offset int, v uint64)

func (Pointer) SetUint56 

func (p Pointer) SetUint56(offset int, v uint64)

func (Pointer) SetUint56BE 

func (p Pointer) SetUint56BE(offset int, v uint64)

func (Pointer) SetUint56LE 

func (p Pointer) SetUint56LE(offset int, v uint64)

func (Pointer) SetUint64 

func (p Pointer) SetUint64(offset int, v uint64)

func (Pointer) SetUint64BE 

func (p Pointer) SetUint64BE(offset int, v uint64)

func (Pointer) SetUint64LE 

func (p Pointer) SetUint64LE(offset int, v uint64)

func (Pointer) SetUint8 

func (p Pointer) SetUint8(offset int, v uint8)

func (Pointer) SetUintptr 

func (p Pointer) SetUintptr(offset int, v uintptr)

func (Pointer) Size 

func (p Pointer) Size() int

func (Pointer) SizeOf 

func (p Pointer) SizeOf() uintptr

Sizeof returns the size of the allocation provided by the platform allocator.

func (Pointer) String 

func (p Pointer) String(offset, size int) string

func (Pointer) Uint 

func (p Pointer) Uint(offset int) uint

func (Pointer) Uint16 

func (p Pointer) Uint16(offset int) uint16

func (Pointer) Uint16BE 

func (p Pointer) Uint16BE(offset int) uint16

func (Pointer) Uint16LE 

func (p Pointer) Uint16LE(offset int) uint16

func (Pointer) Uint24 

func (p Pointer) Uint24(offset int) uint32

func (Pointer) Uint24BE 

func (p Pointer) Uint24BE(offset int) uint32

func (Pointer) Uint24LE 

func (p Pointer) Uint24LE(offset int) uint32

func (Pointer) Uint32 

func (p Pointer) Uint32(offset int) uint32

func (Pointer) Uint32BE 

func (p Pointer) Uint32BE(offset int) uint32

func (Pointer) Uint32BESlow 

func (p Pointer) Uint32BESlow() uint32

func (Pointer) Uint32LE 

func (p Pointer) Uint32LE(offset int) uint32

func (Pointer) Uint40 

func (p Pointer) Uint40(offset int) uint64

func (Pointer) Uint40BE 

func (p Pointer) Uint40BE(offset int) uint64

func (Pointer) Uint40LE 

func (p Pointer) Uint40LE(offset int) uint64

func (Pointer) Uint48 

func (p Pointer) Uint48(offset int) uint64

func (Pointer) Uint48BE 

func (p Pointer) Uint48BE(offset int) uint64

func (Pointer) Uint48LE 

func (p Pointer) Uint48LE(offset int) uint64

func (Pointer) Uint56 

func (p Pointer) Uint56(offset int) uint64

func (Pointer) Uint56BE 

func (p Pointer) Uint56BE(offset int) uint64

func (Pointer) Uint56LE 

func (p Pointer) Uint56LE(offset int) uint64

func (Pointer) Uint64 

func (p Pointer) Uint64(offset int) uint64

func (Pointer) Uint64BE 

func (p Pointer) Uint64BE(offset int) uint64

func (Pointer) Uint64LE 

func (p Pointer) Uint64LE(offset int) uint64

func (Pointer) Uint8 

func (p Pointer) Uint8(offset int) uint8

func (Pointer) Uintptr 

func (p Pointer) Uintptr(offset int) uintptr

func (Pointer) Unsafe 

func (p Pointer) Unsafe() unsafe.Pointer

func (Pointer) Zero 

func (p Pointer) Zero(size uintptr)

Zero zeroes out the entire allocation.

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