Class TypeManager.StructType

java.lang.Object

de.inetsoftware.jwebassembly.module.TypeManager.StructType

All Implemented Interfaces:

AnyType

Direct Known Subclasses:

ArrayType, TypeManager.LambdaType

Enclosing class:

TypeManager

public static class TypeManager.StructType
extends Object
implements AnyType

A reference to a type.

Field Summary

Fields

Modifier and Type	Field	Description
private final int	classIndex
private int	code
private List<NamedStorageType>	fields
private Set<TypeManager.StructType>	instanceOFs
private Map<TypeManager.StructType, List<FunctionName>>	interfaceMethods
private final TypeManager.StructTypeKind	kind
private final TypeManager	manager
private final String	name
private HashSet<String>	neededFields
private List<FunctionName>	vtable
private int	vtableOffset	The offset to the vtable in the data section.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	StructType(String name, TypeManager.StructTypeKind kind, TypeManager manager)	Create a reference to type

Method Summary

Modifier and Type	Method	Description
private void	addOrUpdateVTable(FunctionManager functions, FunctionName funcName, boolean isDefault)	Add the function to the vtable or replace if already exists
int	getClassIndex()	The running index of the class/type for class meta data, instanceof and interface calls.
int	getCode()	The type code(typeidx) in WebAssembly.
protected int	getComponentClassIndex()	The running index of the component/array class/type for class meta data, instanceof and interface calls.
List<NamedStorageType>	getFields()	Get the fields of this struct
TypeManager.StructTypeKind	getKind()	Get kind of the StructType
String	getName()	Get the name of the Java type
int	getVTable()	Get the vtable offset.
boolean	isRefType()	If the type is a reference type.
boolean	isSubTypeOf(AnyType type)	Check if this is a sub type of given type.
private void	listInterfaces(FunctionManager functions, TypeManager types, ClassFileLoader classFileLoader)	List all interfaces of this StructType and and mark all instance methods of used interface methods.
private void	listInterfaceTypes(ClassFile classFile, TypeManager types, ClassFileLoader classFileLoader, Set<TypeManager.StructType> interfaceTypes, Set<String> interfaceNames)	List all interface StrucTypes recursively.
private void	listStructFields(String className, FunctionManager functions, TypeManager types, ClassFileLoader classFileLoader, HashSet<String> allNeededFields)	List the non static fields of the class and its super classes.
private void	scanTypeHierarchy(FunctionManager functions, TypeManager types, ClassFileLoader classFileLoader)	Write this struct type and initialize internal structures
String	toString()
(package private) void	useFieldName(NamedStorageType fieldName)	Mark that the field was used in any getter or setter.
private void	writeStructType(ModuleWriter writer)	Write this struct type and initialize internal structures
void	writeToStream(ByteArrayOutputStream dataStream, ToIntFunction<FunctionName> getFunctionsID, WasmOptions options)	Write the struct/class meta data to the datastream and set the offset position.

Methods inherited from class Object

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

Field Details

name

private final String name

kind

private final TypeManager.StructTypeKind kind

manager

private final TypeManager manager

classIndex

private final int classIndex

code

private int code

neededFields

private HashSet<String> neededFields

fields

private List<NamedStorageType> fields

vtable

private List<FunctionName> vtable

instanceOFs

private Set<TypeManager.StructType> instanceOFs

interfaceMethods

private Map<TypeManager.StructType, List<FunctionName>> interfaceMethods

vtableOffset

private int vtableOffset

The offset to the vtable in the data section.

Constructor Details

StructType

protected StructType(@Nonnull
 String name,
 @Nonnull
 TypeManager.StructTypeKind kind,
 @Nonnull
 TypeManager manager)

Create a reference to type

Parameters:

name - the Java class name like "java/lang/String"

kind - the type kind

manager - the manager which hold all StructTypes

Method Details

useFieldName

void useFieldName(NamedStorageType fieldName)

Mark that the field was used in any getter or setter.

Parameters:

fieldName - the name of the field

scanTypeHierarchy

private void scanTypeHierarchy(FunctionManager functions,
 TypeManager types,
 ClassFileLoader classFileLoader)
                        throws IOException

Write this struct type and initialize internal structures

Parameters:

functions - the used functions for the vtables of the types

types - for types of fields

classFileLoader - for loading the class files

Throws:

IOException - if any I/O error occur on loading or writing

writeStructType

private void writeStructType(ModuleWriter writer)
                      throws IOException

Write this struct type and initialize internal structures

Parameters:

writer - the targets for the types

Throws:

IOException - if any I/O error occur on loading or writing

listStructFields

private void listStructFields(String className,
 FunctionManager functions,
 TypeManager types,
 ClassFileLoader classFileLoader,
 HashSet<String> allNeededFields)
                       throws IOException

List the non static fields of the class and its super classes.

Parameters:

className - the className to list. because the recursion this must not the name of this class

functions - the used functions for the vtables of the types

types - for types of fields

classFileLoader - for loading the class files

allNeededFields - for recursive call list this all used fields

Throws:

IOException - if any I/O error occur on loading or writing

addOrUpdateVTable

private void addOrUpdateVTable(FunctionManager functions,
 FunctionName funcName,
 boolean isDefault)

Add the function to the vtable or replace if already exists

Parameters:

functions - the function manager

funcName - the function to added

isDefault - true, if the function is a default implementation of a interface

listInterfaces

private void listInterfaces(FunctionManager functions,
 TypeManager types,
 ClassFileLoader classFileLoader)
                     throws IOException

List all interfaces of this StructType and and mark all instance methods of used interface methods.

Add all used interfaces to the instanceOf set.

Create the itable for every interface. A list of real functions that should be called if the interface method is called for this type.

mark all implementations of used interface method in this type as used. For example if "java/util/List.size()I" is used anywhere and this StructType implements "java/util/List" then the "size()I" method of this StrucType must also compiled.

Parameters:

functions - the used functions for the vtables of the types

types - for types of fields

classFileLoader - for loading the class files

Throws:

IOException - if any I/O error occur on loading or writing

listInterfaceTypes

private void listInterfaceTypes(ClassFile classFile,
 TypeManager types,
 ClassFileLoader classFileLoader,
 Set<TypeManager.StructType> interfaceTypes,
 Set<String> interfaceNames)
                         throws IOException

List all interface StrucTypes recursively.

Parameters:

classFile - The class from which the interfaces should listed

types - the type manager with references to the types

classFileLoader - for loading the class files

interfaceTypes - the target

interfaceNames - already listed interfaces to prevent a endless loop

Throws:

IOException - if any I/O error occur on loading or writing

getCode

public int getCode()

The type code(typeidx) in WebAssembly. Predefined types have an negative typeidx. Custom types have the positive index in the type section.

Specified by:

getCode in interface AnyType

Returns:

the code

isRefType

public boolean isRefType()

If the type is a reference type. A GC reference to the heap.

Specified by:

isRefType in interface AnyType

Returns:

true, is GC type

isSubTypeOf

public boolean isSubTypeOf(AnyType type)

Check if this is a sub type of given type.

Specified by:

isSubTypeOf in interface AnyType

Parameters:

type - type to check

Returns:

true, if both are identical or this is a sub type of other. Or if other is a parent type of this.

getKind

public TypeManager.StructTypeKind getKind()

Get kind of the StructType

Returns:

the type kind

getName

public String getName()

Get the name of the Java type

Returns:

the name

getClassIndex

public int getClassIndex()

The running index of the class/type for class meta data, instanceof and interface calls.

Returns:

the unique index

getComponentClassIndex

protected int getComponentClassIndex()

The running index of the component/array class/type for class meta data, instanceof and interface calls.

Returns:

the unique index or -1 id not an array

getFields

public List<NamedStorageType> getFields()

Get the fields of this struct

Returns:

the fields

writeToStream

public void writeToStream(ByteArrayOutputStream dataStream,
 ToIntFunction<FunctionName> getFunctionsID,
 WasmOptions options)
                   throws IOException

Write the struct/class meta data to the datastream and set the offset position.

Parameters:

dataStream - the target stream

getFunctionsID - source for function IDs

options - the compiler options

Throws:

IOException - should never occur

See Also:

• TypeManager.TYPE_DESCRIPTION_INTERFACE_OFFSET
• TypeManager.TYPE_DESCRIPTION_INSTANCEOF_OFFSET
• TypeManager.TYPE_DESCRIPTION_TYPE_NAME

getVTable

public int getVTable()

Get the vtable offset.

Returns:

the offset

toString

public String toString()

Overrides:

toString in class Object