Package org.openjdk.asmtools.jasm

Class StackMapData

java.lang.Object

org.openjdk.asmtools.jasm.StackMapData

All Implemented Interfaces:

DataWriter

public class StackMapData
extends Object
implements DataWriter

4.7.4. The StackMapTable Attribute

StackMapTable_attribute { u2 attribute_name_index; u4 attribute_length; u2 number_of_entries; stack_map_frame entries[number_of_entries]; }

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	StackMapData.StackMapItemTagged	verification_type_info: Top_variable_info, Integer_variable_info, Float_variable_info, Null_variable_info, UninitializedThis_variable_info, Long_variable_info, Double_variable_info Common format: *_info { u1 tag = ITEM_*; // from 0 to 6 }
static class	StackMapData.StackMapItemTaggedPointer	verification_type_info: Object_variable_info, Uninitialized_variable_info Common Format: *_info { u1 tag = ITEM_*; // from 7 to 8 u2 cpool_index/offset; }

Field Summary

Fields

Modifier and Type	Field	Description
(package private) JasmEnvironment	environment
private int	frameTypeTag
(package private) boolean	hasStackMapTable
(package private) DataVector<? extends Indexer>	localsMap
private int	offset
private int	pc
private int	scannerPosition
private String	stackFrameType
(package private) DataVector<? extends Indexer>	stackMap

Constructor Summary

Constructors

Constructor	Description
StackMapData(JasmEnvironment environment)

Method Summary

Modifier and Type	Method	Description
int	getLength()
(package private) boolean	isSet()	Checks whether a method's Code attribute has a StackMapTable attribute.
(package private) StackMapData	setIsStackMapTable(boolean hasStackMapTable)	In a class file whose version number is 50.0 or above, if a method's Code attribute does not have a StackMapTable attribute, it has an implicit stack map attribute (§4.10.1).
(package private) StackMapData	setOffset(StackMapData prevFrame)
(package private) StackMapData	setPC(int pc)
(package private) StackMapData	setScannerPosition(int scannerPosition)
(package private) StackMapData	setStackFrameType(String stackFrameType)
void	write(CheckedDataOutputStream out)

Methods inherited from class java.lang.Object

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

Field Details

hasStackMapTable

boolean hasStackMapTable

localsMap

DataVector<? extends Indexer> localsMap

stackMap

DataVector<? extends Indexer> stackMap

environment

JasmEnvironment environment

pc

private int pc

scannerPosition

private int scannerPosition

offset

private int offset

frameTypeTag

private int frameTypeTag

stackFrameType

private String stackFrameType

Constructor Details

StackMapData

StackMapData(JasmEnvironment environment)

Method Details

setOffset

StackMapData setOffset(StackMapData prevFrame)

setStackFrameType

StackMapData setStackFrameType(String stackFrameType)

setIsStackMapTable

StackMapData setIsStackMapTable(boolean hasStackMapTable)

In a class file whose version number is 50.0 or above, if a method's Code attribute does not have a StackMapTable attribute, it has an implicit stack map attribute (§4.10.1). This implicit stack map attribute is equivalent to a StackMapTable attribute with number_of_entries equal to zero.

Parameters:

hasStackMapTable - false if a method's Code attribute does not have a StackMapTable attribute

setPC

StackMapData setPC(int pc)

setScannerPosition

StackMapData setScannerPosition(int scannerPosition)

isSet

boolean isSet()

Checks whether a method's Code attribute has a StackMapTable attribute.

Returns:

true if a method's Code attribute has a StackMapTable attribute.

getLength

public int getLength()

Specified by:

getLength in interface DataWriter

write

public void write(CheckedDataOutputStream out)
           throws IOException

Specified by:

write in interface DataWriter

Throws:

IOException