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first step for field description of classes for reflection API

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This commit is contained in:
Volker Berlin 2022-04-18 23:20:17 +02:00
parent 4525c29263
commit 7aaf9619bd
1 changed files with 22 additions and 3 deletions
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25
src/de/inetsoftware/jwebassembly/module/TypeManager.java
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@ -94,6 +94,11 @@ public class TypeManager {
*/
public static final int TYPE_DESCRIPTION_ARRAY_TYPE = 12;
/**
* Byte position in the type description that contains the offset to the fields. Length 4 bytes.
*/
public static final int TYPE_DESCRIPTION_FIELDS_OFFSET = 16;
/**
* The reserved index position of the first function in the vtable. For performance reasons the first function does not have the index 0 but this index.
* For the byte offset you have to multiply it by 4.
@ -101,8 +106,9 @@ public class TypeManager {
* <li>offset of instanceof list
* <li>offset of class name idx in the string constant table
* <li>array component type
* <li>offset of fields description
*/
private static final int VTABLE_FIRST_FUNCTION_INDEX = 4;
private static final int VTABLE_FIRST_FUNCTION_INDEX = 5;
private static final FunctionName CLASS_CONSTANT_FUNCTION = new FunctionName( "java/lang/Class.classConstant(I)Ljava/lang/Class;" );
@ -1094,6 +1100,8 @@ public class TypeManager {
├───────────────────────────────────────┤
| array component type [4 bytes] |
├───────────────────────────────────────┤
| Offset to field descript. [4 bytes] |
├───────────────────────────────────────┤
| first vtable entry [4 bytes] |
├───────────────────────────────────────┤
| ..... |
@ -1139,13 +1147,24 @@ public class TypeManager {
data.writeInt32( type.getClassIndex() );
}
int classNameIdx = options.strings.get( getName().replace( '/', '.' ) );
int nameIdx = options.strings.get( getName().replace( '/', '.' ) );
// header position TYPE_DESCRIPTION_TYPE_NAME
header.writeInt32( classNameIdx ); // string id of the className
header.writeInt32( nameIdx ); // string id of the className
// header position TYPE_DESCRIPTION_ARRAY_TYPE
header.writeInt32( getComponentClassIndex() );
// header position TYPE_DESCRIPTION_FIELDS_OFFSET
header.writeInt32( data.size() + VTABLE_FIRST_FUNCTION_INDEX * 4 );
if( kind == StructTypeKind.normal ) {
for( NamedStorageType field : fields ) {
nameIdx = options.strings.get( field.getName() );
//TODO adapt this format for the reflection API
data.writeInt32( nameIdx );
data.writeInt32( field.getType().getCode() );
}
}
data.writeTo( dataStream );
}