Struct jit_allocator::virtual_memory::MemoryFlags

#[repr(transparent)]
pub struct MemoryFlags(pub u32);

Tuple Fields

0: u32

Implementations

impl MemoryFlags

pub const NONE: u32 = 0u32

No flags

pub const ACCESS_READ: u32 = 1u32

Memory is readable.

pub const ACCESS_WRITE: u32 = 2u32

Memory is writable.

pub const ACCESS_EXECUTE: u32 = 4u32

Memory is executable.

pub const ACCESS_RW: u32 = 3u32

Memory is readable and writable.

pub const ACCESS_RX: u32 = 5u32

Memory is readable and executable.

pub const ACCESS_RWX: u32 = 7u32

Memory is readable, writable and executable.

pub const MMAP_ENABLE_JIT: u32 = 16u32

Use a MAP_JIT flag available on Apple platforms (introduced by Mojave), which allows JIT code to be executed in a MAC bundle.

This flag may be turned on by the allocator if there is no other way of allocating executable memory.

Note

This flag can only be used with [alloc], MAP_JIT only works on OSX and not on iOS. When a process uses fork() the child process has no access to the pages mapped with MAP_JIT.

pub const MMAP_MAX_ACCESS_READ: u32 = 32u32

Pass PROT_MAX(PROT_READ) or PROT_MPROTECT(PROT_READ) to mmap() on platforms that support it.

This flag allows to set a “maximum access” that the memory page can get during its lifetime. Use protect to change the access flags.

Note

This flag can only be used with [alloc] and alloc_dual_mapping. However alloc_dual_mapping may automatically use this if AccessRead is used.

pub const MMAP_MAX_ACCESS_WRITE: u32 = 64u32

Pass PROT_MAX(PROT_WRITE) or PROT_MPROTECT(PROT_WRITE) to mmap() on platforms that support it.

This flag allows to set a “maximum access” that the memory page can get during its lifetime. Use protect to change the access flags.

Note

This flag can only be used with [alloc] and alloc_dual_mapping. However alloc_dual_mapping may automatically use this if AccessWrite is used.

pub const MMAP_MAX_ACCESS_EXECUTE: u32 = 128u32

Pass PROT_MAX(PROT_EXEC) or PROT_MPROTECT(PROT_EXEC) to mmap() on platforms that support it.

This flag allows to set a “maximum access” that the memory page can get during its lifetime. Use protect to change the access flags.

Note

This flag can only be used with [alloc] and alloc_dual_mapping. However alloc_dual_mapping may automatically use this if AccessExecute is used.

pub const MMAP_MAX_ACCESS_RW: u32 = 96u32

pub const MMAP_MAX_ACCESS_RX: u32 = 160u32

pub const MMAP_MAX_ACCESS_RWX: u32 = 224u32

pub const MAP_SHARED: u32 = 256u32

Use MAP_SHARED when calling mmap().

Note

In some cases MAP_SHARED may be set automatically. For example, some dual mapping implementations must use MAP_SHARED instead of MAP_PRIVATE to ensure that the OS would not apply copy on write on RW page, which would cause RX page not having the updated content.

pub const MAPPING_PREFER_TMP: u32 = 2_147_483_648u32

Not an access flag, only used by alloc_dual_mapping() to override the default allocation strategy to always use a ‘tmp’ directory instead of “/dev/shm” (on POSIX platforms). Please note that this flag will be ignored if the operating system allows to allocate an executable memory by a different API than open() or shm_open(). For example on Linux memfd_create() is preferred and on BSDs shm_open(SHM_ANON, ...) is used if SHM_ANON is defined.

Note

This flag can only be used with [alloc].

impl MemoryFlags

pub fn contains(self, other: u32) -> bool

Trait Implementations

impl BitAnd<MemoryFlags> for MemoryFlags

type Output = MemoryFlags

The resulting type after applying the & operator.

fn bitand(self, rhs: Self) -> Self::Output

Performs the & operation.

impl BitAnd<u32> for MemoryFlags

type Output = MemoryFlags

The resulting type after applying the & operator.

fn bitand(self, rhs: u32) -> Self::Output

Performs the & operation.

impl BitAndAssign<MemoryFlags> for MemoryFlags

fn bitand_assign(&mut self, rhs: Self)

Performs the &= operation.

impl BitAndAssign<u32> for MemoryFlags

fn bitand_assign(&mut self, rhs: u32)

Performs the &= operation.

impl BitOr<MemoryFlags> for MemoryFlags

type Output = MemoryFlags

The resulting type after applying the | operator.

fn bitor(self, rhs: Self) -> Self::Output

Performs the | operation.

impl BitOr<u32> for MemoryFlags

type Output = MemoryFlags

The resulting type after applying the | operator.

fn bitor(self, rhs: u32) -> Self::Output

Performs the | operation.

impl BitOrAssign<MemoryFlags> for MemoryFlags

fn bitor_assign(&mut self, rhs: Self)

Performs the |= operation.

impl BitOrAssign<u32> for MemoryFlags

fn bitor_assign(&mut self, rhs: u32)

Performs the |= operation.

impl Clone for MemoryFlags

fn clone(&self) -> MemoryFlags

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MemoryFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<MemoryFlags> for u32

fn from(val: MemoryFlags) -> Self

Converts to this type from the input type.

impl From<u32> for MemoryFlags

fn from(value: u32) -> Self

Converts to this type from the input type.

impl Hash for MemoryFlags

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for MemoryFlags

fn cmp(&self, other: &MemoryFlags) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl PartialEq<MemoryFlags> for MemoryFlags

fn eq(&self, other: &MemoryFlags) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<u32> for MemoryFlags

fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd<MemoryFlags> for MemoryFlags

fn partial_cmp(&self, other: &MemoryFlags) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for MemoryFlags

impl Eq for MemoryFlags

impl StructuralEq for MemoryFlags

impl StructuralPartialEq for MemoryFlags