org.objectweb.asm.attrs
public class SignatureAttribute extends Attribute
Classfiles need to carry generic type information in a backwards compatible way. This is accomplished by introducing a new "Signature" attribute for classes, methods and fields. The structure of this attribute is as follows:
"Signature" (u4 attr-length, u2 signature-index)When used as an attribute of a method or field, a signature gives the full (possibly generic) type of that method or field. When used as a class attribute, a signature indicates the type parameters of the class, followed by its supertype, followed by all its interfaces.
The type syntax in signatures is extended to parameterized types and type variables. There is also a new signature syntax for formal type parameters. The syntax extensions for signature strings are as follows:
MethodOrFieldSignature ::= TypeSignature ClassSignature ::= ParameterPartOpt super_TypeSignature interface_TypeSignatures TypeSignatures ::= TypeSignatures TypeSignature | TypeSignature ::= ... | ClassTypeSignature | MethodTypeSignature | TypeVariableSignature ClassTypeSignature ::= 'L' Ident TypeArgumentsOpt ';' | ClassTypeSignature '.' Ident ';' TypeArgumentsOpt MethodTypeSignature ::= TypeArgumentsOpt '(' TypeSignatures ')' TypeSignature ThrowsSignatureListOpt ThrowsSignatureList ::= ThrowsSignature ThrowsSignatureList | ThrowsSignature ThrowsSignature ::= '^' TypeSignature TypeVariableSignature ::= 'T' Ident ';' TypeArguments ::= '<' TypeSignature TypeSignatures '>' ParameterPart ::= '<' ParameterSignature ParameterSignatures '>' ParameterSignatures ::= ParameterSignatures ParameterSignature | ParameterSignature ::= Ident ':' bound_TypeSignature
See Also: JSR 14 : Add Generic
Types To The JavaTM Programming Language
Field Summary | |
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String | signature |
Constructor Summary | |
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SignatureAttribute() | |
SignatureAttribute(String signature) |
Method Summary | |
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protected Attribute | read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels) |
String | toString() |
protected ByteVector | write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals) |