Examples of org.objectweb.asm.MethodVisitor.visitLabel()

org.objectweb.asm.MethodVisitor.visitLabel()
Visits a label. A label designates the instruction that will be visited just after it. @param label a {@link Label Label} object.

        final Label synchronizedEnd = new Label();
        final Label catchAll = new Label();


        mv.visitVarInsn(ALOAD, index);
        mv.visitInsn(MONITORENTER);
        mv.visitLabel(synchronizedStart);
        // place holder for "empty" synchronized blocks, for example
        // if there is only a break/continue.
        mv.visitInsn(NOP);


        Runnable finallyPart = new Runnable() {

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        compileStack.writeExceptionTable(fb, catchAll, null);
        compileStack.pop(); //pop fb


        finallyPart.run();
        mv.visitJumpInsn(GOTO, synchronizedEnd);
        mv.visitLabel(catchAll);
        finallyPart.run();
        mv.visitInsn(ATHROW);


        mv.visitLabel(synchronizedEnd);
    }

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        mv.visitJumpInsn(GOTO, synchronizedEnd);
        mv.visitLabel(catchAll);
        finallyPart.run();
        mv.visitInsn(ATHROW);


        mv.visitLabel(synchronizedEnd);
    }


    public void writeAssert(AssertStatement statement) {
        controller.getAcg().onLineNumber(statement, "visitAssertStatement");
        writeStatementLabel(statement);

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    private static MethodVisitor writeMethod(ClassWriter cw, String name, int argumentCount, final String superClass, CachedMethod cachedMethod, String receiverType, String parameterDescription, boolean useArray) {
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "call" + name, "(L" + receiverType + ";" + parameterDescription + ")Ljava/lang/Object;", null, null);
        mv.visitCode();
        
        final Label tryStart = new Label();
        mv.visitLabel(tryStart);
        
        // call for checking if method is still valid
        for (int i = 0; i < argumentCount; ++i) mv.visitVarInsn(Opcodes.ALOAD, i);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, superClass, "checkCall", "(Ljava/lang/Object;" + parameterDescription + ")Z");
        Label l0 = new Label();

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        // return
        mv.visitInsn(Opcodes.ARETURN);
        
        // fall back after method change
        mv.visitLabel(l0);
        for (int i = 0; i < argumentCount; ++i) mv.visitVarInsn(Opcodes.ALOAD, i);
        if (!useArray) {
            mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/ArrayUtil", "createArray", "(" + parameterDescription + ")[Ljava/lang/Object;");
        }
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/callsite/CallSiteArray", "defaultCall" + name, "(Lorg/codehaus/groovy/runtime/callsite/CallSite;L" + receiverType + ";[Ljava/lang/Object;)Ljava/lang/Object;");

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        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/callsite/CallSiteArray", "defaultCall" + name, "(Lorg/codehaus/groovy/runtime/callsite/CallSite;L" + receiverType + ";[Ljava/lang/Object;)Ljava/lang/Object;");
        mv.visitInsn(Opcodes.ARETURN);
        
        // exception unwrapping for stackless exceptions
        final Label tryEnd = new Label();
        mv.visitLabel(tryEnd);
        final Label catchStart = new Label();
        mv.visitLabel(catchStart);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/ScriptBytecodeAdapter", "unwrap", "(Lgroovy/lang/GroovyRuntimeException;)Ljava/lang/Throwable;");
        mv.visitInsn(Opcodes.ATHROW);        
        mv.visitTryCatchBlock(tryStart, tryEnd, catchStart, GRE);

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        // exception unwrapping for stackless exceptions
        final Label tryEnd = new Label();
        mv.visitLabel(tryEnd);
        final Label catchStart = new Label();
        mv.visitLabel(catchStart);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/ScriptBytecodeAdapter", "unwrap", "(Lgroovy/lang/GroovyRuntimeException;)Ljava/lang/Throwable;");
        mv.visitInsn(Opcodes.ATHROW);        
        mv.visitTryCatchBlock(tryStart, tryEnd, catchStart, GRE);
        
        mv.visitMaxs(0, 0);

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      mv.visitVarInsn(ALOAD, 0);
      mv.visitVarInsn(ILOAD, 1);
      mv.visitFieldInsn(PUTFIELD, "pkg/Bean", "f", "I");
      Label end = new Label();
      mv.visitJumpInsn(GOTO, end);
      mv.visitLabel(label);
      mv.visitFrame(F_SAME, 0, null, 0, null);
      mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
      mv.visitInsn(DUP);
      mv.visitMethodInsn(INVOKESPECIAL,
          "java/lang/IllegalArgumentException", "<init>", "()V");

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      mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
      mv.visitInsn(DUP);
      mv.visitMethodInsn(INVOKESPECIAL,
          "java/lang/IllegalArgumentException", "<init>", "()V");
      mv.visitInsn(ATHROW);
      mv.visitLabel(end);
      mv.visitFrame(F_SAME, 0, null, 0, null);
      mv.visitInsn(RETURN);
      mv.visitMaxs(2, 2);
      mv.visitEnd();
    }

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            final Label jmpLabel = new Label();
            mv.visitJumpInsn(Opcodes.IF_ACMPNE, jmpLabel);
            mv.visitVarInsn(Opcodes.ALOAD, 0);
            mv.visitInsn(Opcodes.ACONST_NULL);
            mv.visitFieldInsn(Opcodes.PUTFIELD, className.replace('.', '/'), fieldName, type.toString());
            mv.visitLabel(jmpLabel);
        }
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(2, 2);
    }
}

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