Module openj9.dtfj

Package com.ibm.dtfj.java

Interface JavaRuntimeMemorySection

All Superinterfaces:

ImageSection

All Known Implementing Classes:

DTFJGenericJavaRuntimeMemorySection, DTFJJavaRuntimeMemorySectionBase, DTFJMemoryTagRuntimeMemorySection

public interface JavaRuntimeMemorySection
extends ImageSection

Represents a native memory range allocated by the Java Runtime.

Since:

1.5

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ALLOCATION_TYPE_MALLOC_FREED	Type code for memory that was allocated, and freed, by the Java runtime on the native heap using malloc() or similar.
static final int	ALLOCATION_TYPE_MALLOC_LIVE	Type code for memory allocated on the native heap via an API such as malloc().
static final int	ALLOCATION_TYPE_MEMORY_MAPPED_FILE	Type code for memory allocated for memory mapping files through an API like mmap().
static final int	ALLOCATION_TYPE_SHARED_MEMORY	Type code for shared memory sections.
static final int	ALLOCATION_TYPE_VIRTUAL_ALLOC	Type code for anonymous memory mappings / virtual allocations.

Method Summary

Modifier and Type	Method	Description
int	getAllocationType()	Get memory allocation type code.
String	getAllocator()	Returns string describing the code that allocated this memory section.
JavaRuntimeMemoryCategory	getMemoryCategory()	Returns memory category this section was allocated under.

Methods declared in interface com.ibm.dtfj.image.ImageSection

getBaseAddress, getName, getProperties, getSize, isExecutable, isReadOnly, isShared

Field Details

ALLOCATION_TYPE_MALLOC_LIVE

static final int ALLOCATION_TYPE_MALLOC_LIVE

Type code for memory allocated on the native heap via an API such as malloc(). Covers malloc'd memory that hasn't been freed

See Also:

• getAllocationType()
• Constant Field Values

ALLOCATION_TYPE_MALLOC_FREED

static final int ALLOCATION_TYPE_MALLOC_FREED

Type code for memory that was allocated, and freed, by the Java runtime on the native heap using malloc() or similar.

See Also:

• getAllocationType()
• Constant Field Values

ALLOCATION_TYPE_MEMORY_MAPPED_FILE

static final int ALLOCATION_TYPE_MEMORY_MAPPED_FILE

Type code for memory allocated for memory mapping files through an API like mmap().

See Also:

• getAllocationType()
• Constant Field Values

ALLOCATION_TYPE_VIRTUAL_ALLOC

static final int ALLOCATION_TYPE_VIRTUAL_ALLOC

Type code for anonymous memory mappings / virtual allocations.

See Also:

• getAllocationType()
• Constant Field Values

ALLOCATION_TYPE_SHARED_MEMORY

static final int ALLOCATION_TYPE_SHARED_MEMORY

Type code for shared memory sections.

See Also:

• getAllocationType()
• Constant Field Values

Method Details

getAllocator

String getAllocator()
             throws CorruptDataException,
DataUnavailable

Returns string describing the code that allocated this memory section.

Returns:

Allocator string.

Throws:

CorruptDataException

DataUnavailable

getMemoryCategory

JavaRuntimeMemoryCategory getMemoryCategory()
                                     throws CorruptDataException,
DataUnavailable

Returns memory category this section was allocated under.

Returns:

Memory category.

Throws:

CorruptDataException

DataUnavailable

getAllocationType

int getAllocationType()

Get memory allocation type code.

Returns:

Type code.