Package org.glassfish.pfl.dynamic.codegen.impl

Class ByteCodeUtility

  • public final class ByteCodeUtility
extends java.lang.Object
    Class that is responsible for low-level bytecode generation using ASM. It provides methods that directly generate bytecode in a MethodVisitor. This will often be accompanied by type analysis, such as in determining the correct sort of return instruction to use, or how to generate code for a constant.

    • Constructor Detail

      • ByteCodeUtility

        public ByteCodeUtility​(org.objectweb.asm.ClassWriter cw,
                       ClassGeneratorImpl cg,
                       boolean debug,
                       java.io.PrintStream ps)
        Construct an instance of ByteCodeUtility from an ASM ClassWriter and a codegen ClassGeneratorImpl. If debug is true, debugText() can be called to get a text representation of the generated code for debugging purposes.

      • ByteCodeUtility

        public ByteCodeUtility​(org.objectweb.asm.ClassWriter cw,
                       ClassGeneratorImpl cg)

    • Method Detail

      • dump

        private void dump()

      • emitLineNumberTable

        private void emitLineNumberTable​(MethodGenerator mg)

      • emitLocalVariableTable

        private void emitLocalVariableTable​(MethodGenerator mg)

      • emitMethodEnd

        public void emitMethodEnd​(MethodGenerator mg,
                          org.objectweb.asm.Label returnLabel,
                          Variable returnVariable,
                          boolean dump)

      • emitReturn

        private void emitReturn​(Type returnType)

      • emitRet

        public void emitRet​(Variable var)

      • emitConstantExpression

        public void emitConstantExpression​(Type type,
                                   java.lang.Object value)

      • emitThisExpression

        public void emitThisExpression()

      • emitConditionalBranch

        public void emitConditionalBranch​(MyLabel falseBranch)

      • emitBranch

        public void emitBranch​(MyLabel target)

      • emitNewCall

        public void emitNewCall​(Type type)
        Emit the NEW, DUP sequence required at the start of a new call.

      • emitInstanceof

        public void emitInstanceof​(Type type)

      • emitCast

        public void emitCast​(Type from,
                     Type to)

      • emitDup

        public void emitDup()

      • emitArrayStore

        public void emitArrayStore()

      • typeCode

        public int typeCode​(Type type)

      • emitNewArrayCall

        public void emitNewArrayCall​(Type type)

      • emitStaticInvoke

        public void emitStaticInvoke​(Type type,
                             java.lang.String name,
                             Signature sig)
        Emit a static INVOKE instruction.

      • emitInvoke

        public void emitInvoke​(Type type,
                       java.lang.String name,
                       Signature sig)
        Emit the appropriate non-static INVOKE instruction as follows:
        1. If type is an interface, emit INVOKEINTERFACE.
        2. If name/sig has private access in type, emit INVOKESPECIAL. Note that the target must be "this" in this case.
        3. Otherwise emit INVOKEVIRTUAL.

      • emitNewInvoke

        public void emitNewInvoke​(Type type,
                          Signature sig)
        Emit the INVOKESPECIAL instruction for calling a constructor with the given signature. This is used for new Foo() calls, and for super() and this() calls at the start of a constructor.

      • emitSpecialInvoke

        public void emitSpecialInvoke​(Type type,
                              java.lang.String name,
                              Signature sig)
        Emit the INVOKESPECIAL instruction for calling a method with the given signature. This is used for for super.name() and this.name() method calls.

      • emitThrow

        public void emitThrow()

      • emitExceptionTableEntry

        public void emitExceptionTableEntry​(org.objectweb.asm.Label start,
                                    org.objectweb.asm.Label end,
                                    org.objectweb.asm.Label handler,
                                    Type exceptionType)

      • emitJsr

        public void emitJsr​(org.objectweb.asm.Label label)

      • emitPop

        public void emitPop()

      • emitConversion

        public void emitConversion​(Type from,
                           Type to)