com.oracle.svm.core.os

Class OSCommittedMemoryProvider

java.lang.Object

com.oracle.svm.core.os.AbstractCommittedMemoryProvider

com.oracle.svm.core.os.OSCommittedMemoryProvider

All Implemented Interfaces:

CommittedMemoryProvider

public class OSCommittedMemoryProvider
extends AbstractCommittedMemoryProvider

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	OSCommittedMemoryProvider.VirtualMemoryTracker

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
OSCommittedMemoryProvider()

Method Summary

Modifier and Type	Method and Description
org.graalvm.word.Pointer	allocate(org.graalvm.word.UnsignedWord size, org.graalvm.word.UnsignedWord alignment, boolean executable) Allocate a block of committed memory.
boolean	areUnalignedChunksZeroed() This method returns true if the memory returned by CommittedMemoryProvider.allocateUnalignedChunk(org.graalvm.word.UnsignedWord) is guaranteed to be zeroed.
boolean	free(org.graalvm.word.PointerBase start, org.graalvm.word.UnsignedWord nbytes, org.graalvm.word.UnsignedWord alignment, boolean executable) Release a block of committed memory that was allocated with CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean), requiring the exact same parameter values that were originally passed to CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).
int	initialize(org.graalvm.nativeimage.c.type.WordPointer isolatePointer, CEntryPointCreateIsolateParameters parameters) Performs initializations for the current isolate, before any other methods of this interface may be called.
int	tearDown() Tear down for the current isolate.

Methods inherited from class com.oracle.svm.core.os.AbstractCommittedMemoryProvider

allocateAlignedChunk, allocateExecutableMemory, allocateUnalignedChunk, freeAlignedChunk, freeExecutableMemory, freeUnalignedChunk, guaranteesHeapPreferredAddressSpaceAlignment, protect, 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, beforeGarbageCollection, get, getGranularity

Constructor Detail

OSCommittedMemoryProvider

public OSCommittedMemoryProvider()

Method Detail

initialize

public int initialize(org.graalvm.nativeimage.c.type.WordPointer isolatePointer,
                      CEntryPointCreateIsolateParameters parameters)

Description copied from interface: CommittedMemoryProvider

Performs initializations for the current isolate, before any other methods of this interface may be called.

Returns:

zero in case of success, non-zero in case of an error.

tearDown

public int tearDown()

Description copied from interface: CommittedMemoryProvider

Tear down for the current isolate. This must be the last method of this interface that is called in an isolate.

Returns:

zero in case of success, non-zero in case of an error.

allocate

public org.graalvm.word.Pointer allocate(org.graalvm.word.UnsignedWord size,
                                         org.graalvm.word.UnsignedWord alignment,
                                         boolean executable)

Description copied from interface: CommittedMemoryProvider

Allocate a block of committed memory.

Parameters:

size - The number of bytes to allocate, which is rounded up to the next multiple of the granularity if required.

alignment - The required alignment of the block start, or CommittedMemoryProvider.UNALIGNED.

executable - Whether the block must be executable.

Returns:

The start of the allocated block, or WordFactory.nullPointer() in case of an error.

areUnalignedChunksZeroed

public boolean areUnalignedChunksZeroed()

Description copied from interface: CommittedMemoryProvider

This method returns true if the memory returned by CommittedMemoryProvider.allocateUnalignedChunk(org.graalvm.word.UnsignedWord) is guaranteed to be zeroed.

free

public boolean free(org.graalvm.word.PointerBase start,
                    org.graalvm.word.UnsignedWord nbytes,
                    org.graalvm.word.UnsignedWord alignment,
                    boolean executable)

Description copied from interface: CommittedMemoryProvider

Release a block of committed memory that was allocated with CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean), requiring the exact same parameter values that were originally passed to CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).

Parameters:

start - The start of the memory block, as returned by CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).

nbytes - The originally requested size in bytes.

alignment - The originally requested alignment.

executable - Whether the block was requested to be executable.

Returns:

true on success, or false otherwise.