Examples of scala.tools.asm.MethodVisitor

scala.tools.asm.MethodVisitor
A visitor to visit a Java method. The methods of this class must be called in the following order: ( visitParameter )* [ visitAnnotationDefault ] ( visitAnnotation | visitTypeAnnotation | visitAttribute )* [ visitCode ( visitFrame | visitXInsn | visitLabel | visitInsnAnnotation | visitTryCatchBlock | visitTryCatchBlockAnnotation | visitLocalVariable | visitLocalVariableAnnotation | visitLineNumber )* visitMaxs ] visitEnd. In addition, the visitXInsn and visitLabel methods must be called in the sequential order of the bytecode instructions of the visited code, visitInsnAnnotation must be called after the annotated instruction, visitTryCatchBlock must be called before the labels passed as arguments have been visited, visitTryCatchBlockAnnotation must be called after the corresponding try catch block has been visited, and the visitLocalVariable, visitLocalVariableAnnotation and visitLineNumber methods must be called after the labels passed as arguments have been visited. @author Eric Bruneton

    @Override
    public MethodVisitor visitMethod(final int access, final String name,
            final String desc, final String signature, final String[] exceptions) {
        Printer p = this.p.visitMethod(access, name, desc, signature,
                exceptions);
        MethodVisitor mv = cv == null ? null : cv.visitMethod(access, name,
                desc, signature, exceptions);
        return new TraceMethodVisitor(mv, p);
    }

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     *            a class visitor.
     */
    public void accept(final ClassVisitor cv) {
        String[] exceptions = new String[this.exceptions.size()];
        this.exceptions.toArray(exceptions);
        MethodVisitor mv = cv.visitMethod(access, name, desc, signature,
                exceptions);
        if (mv != null) {
            accept(mv);
        }
    }

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  }


  public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
    // delegate the method call to the next
    // chained visitor
    MethodVisitor mv = cv.visitMethod(access, name, desc, signature, exceptions);
    if (!profilerClass.equals(className)) {
      // only instrument non-abstract methods
      if((access & ACC_ABSTRACT) == 0) {
        assert(className != null);
        /* The following instructions do not modify compressed stack frame map so
         * we don't need to worry about recalculating stack frame map. Specifically,
         * let's quote "ASM 4.0, A Java bytecode engineering library" guide (p. 40):
         *
         *   In order to save space, a compiled method does not contain one frame per
         *   instruction: in fact it contains only the frames for the instructions
         *   that correspond to jump targets or exception handlers, or that follow
         *   unconditional jump instructions. Indeed the other frames can be easily
         *   and quickly inferred from these ones.
         *
         * Instructions below are just loading constants and calling a method so according
         * to definition above they do not contribute to compressed stack frame map.
         */
        mv.visitLdcInsn(className);
        mv.visitLdcInsn(name);
        mv.visitLdcInsn(desc);
        mv.visitMethodInsn(INVOKESTATIC, profilerClass, "methodCalled",
            "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V", false);
      }
    }
    return mv;
  }

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Related Classes of scala.tools.asm.MethodVisitor

scala.tools.asm.tree.MethodNode

scala.tools.asm.util.TraceClassVisitor

scala.tools.partest.javaagent.ProfilerVisitor

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