com.oracle.svm.core.os

Class AbstractCommittedMemoryProvider

java.lang.Object

com.oracle.svm.core.os.AbstractCommittedMemoryProvider

All Implemented Interfaces:

CommittedMemoryProvider

Direct Known Subclasses:

OSCommittedMemoryProvider

public abstract class AbstractCommittedMemoryProvider
extends Object
implements CommittedMemoryProvider

Nested Class Summary

Nested classes/interfaces inherited from interface com.oracle.svm.core.os.CommittedMemoryProvider

CommittedMemoryProvider.Access

Field Summary

Fields inherited from interface com.oracle.svm.core.os.CommittedMemoryProvider

UNALIGNED

Constructor Summary

Constructors

Constructor and Description
AbstractCommittedMemoryProvider()

Method Summary

Modifier and Type	Method and Description
org.graalvm.word.Pointer	allocateAlignedChunk(org.graalvm.word.UnsignedWord nbytes, org.graalvm.word.UnsignedWord alignment)
org.graalvm.word.Pointer	allocateExecutableMemory(org.graalvm.word.UnsignedWord nbytes, org.graalvm.word.UnsignedWord alignment)
org.graalvm.word.Pointer	allocateUnalignedChunk(org.graalvm.word.UnsignedWord nbytes)
void	freeAlignedChunk(org.graalvm.word.PointerBase start, org.graalvm.word.UnsignedWord nbytes, org.graalvm.word.UnsignedWord alignment)
void	freeExecutableMemory(org.graalvm.word.PointerBase start, org.graalvm.word.UnsignedWord nbytes, org.graalvm.word.UnsignedWord alignment)
void	freeUnalignedChunk(org.graalvm.word.PointerBase start, org.graalvm.word.UnsignedWord nbytes)
boolean	guaranteesHeapPreferredAddressSpaceAlignment() Returns whether this provider will always guarantee a heap address space alignment of Heap.getPreferredAddressSpaceAlignment() at image runtime, which may also depend on ImageHeapProvider.guaranteesHeapPreferredAddressSpaceAlignment().
boolean	protect(org.graalvm.word.PointerBase start, org.graalvm.word.UnsignedWord nbytes, EnumSet<CommittedMemoryProvider.Access> accessFlags) Change access permissions for a block of committed memory that was allocated with CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).
protected static int	protectSingleIsolateImageHeap()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.oracle.svm.core.os.CommittedMemoryProvider

afterGarbageCollection, allocate, areUnalignedChunksZeroed, beforeGarbageCollection, free, get, getGranularity, initialize, tearDown

Constructor Detail

AbstractCommittedMemoryProvider

public AbstractCommittedMemoryProvider()

Method Detail

guaranteesHeapPreferredAddressSpaceAlignment

public boolean guaranteesHeapPreferredAddressSpaceAlignment()

Description copied from interface: CommittedMemoryProvider

Returns whether this provider will always guarantee a heap address space alignment of Heap.getPreferredAddressSpaceAlignment() at image runtime, which may also depend on ImageHeapProvider.guaranteesHeapPreferredAddressSpaceAlignment().

Specified by:

guaranteesHeapPreferredAddressSpaceAlignment in interface CommittedMemoryProvider

allocateAlignedChunk

public org.graalvm.word.Pointer allocateAlignedChunk(org.graalvm.word.UnsignedWord nbytes,
                                                     org.graalvm.word.UnsignedWord alignment)

Specified by:

allocateAlignedChunk in interface CommittedMemoryProvider

allocateUnalignedChunk

public org.graalvm.word.Pointer allocateUnalignedChunk(org.graalvm.word.UnsignedWord nbytes)

Specified by:

allocateUnalignedChunk in interface CommittedMemoryProvider

allocateExecutableMemory

public org.graalvm.word.Pointer allocateExecutableMemory(org.graalvm.word.UnsignedWord nbytes,
                                                         org.graalvm.word.UnsignedWord alignment)

Specified by:

allocateExecutableMemory in interface CommittedMemoryProvider

freeAlignedChunk

public void freeAlignedChunk(org.graalvm.word.PointerBase start,
                             org.graalvm.word.UnsignedWord nbytes,
                             org.graalvm.word.UnsignedWord alignment)

Specified by:

freeAlignedChunk in interface CommittedMemoryProvider

freeUnalignedChunk

public void freeUnalignedChunk(org.graalvm.word.PointerBase start,
                               org.graalvm.word.UnsignedWord nbytes)

Specified by:

freeUnalignedChunk in interface CommittedMemoryProvider

freeExecutableMemory

public void freeExecutableMemory(org.graalvm.word.PointerBase start,
                                 org.graalvm.word.UnsignedWord nbytes,
                                 org.graalvm.word.UnsignedWord alignment)

Specified by:

freeExecutableMemory in interface CommittedMemoryProvider

protectSingleIsolateImageHeap

protected static int protectSingleIsolateImageHeap()

protect

public boolean protect(org.graalvm.word.PointerBase start,
                       org.graalvm.word.UnsignedWord nbytes,
                       EnumSet<CommittedMemoryProvider.Access> accessFlags)

Description copied from interface: CommittedMemoryProvider

Change access permissions for a block of committed memory that was allocated with CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).

Specified by:

protect in interface CommittedMemoryProvider

Parameters:

start - The start of the address range to be protected, which must be a multiple of the granularity.

nbytes - The size in bytes of the address range to be protected, which will be rounded up to a multiple of the granularity.

accessFlags - The modes in which the memory is permitted to be accessed, see CommittedMemoryProvider.Access.

Returns:

true on success, or false otherwise.