Examples of org.ow2.asm.MethodVisitor

org.ow2.asm.MethodVisitor
A visitor to visit a Java method. The methods of this interface must be called in the following order: [ visitAnnotationDefault ] ( visitAnnotation | visitParameterAnnotation | visitAttribute )* [ visitCode ( visitFrame | visitXInsn | visitLabel | visitTryCatchBlock | visitLocalVariable | 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, visitTryCatchBlock must be called before the labels passed as arguments have been visited, and the visitLocalVariable and visitLineNumber methods must be called after the labels passed as arguments have been visited. @author Eric Bruneton

        } catch (Exception e) {
        }
    }


    public void testIllegalMethodInsnVisitBeforeStart() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        try {
            mv.visitInsn(NOP);
            fail();
        } catch (Exception e) {
        }
    }

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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }


    private void returnInsns(final ClassWriter cw) {
        MethodVisitor mv;
        mv = cw.visitMethod(ACC_STATIC, "ireturnInsn", "()I", null, null);
        mv.visitCode();
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
        mv = cw.visitMethod(ACC_PRIVATE, "lreturnInsn", "()J", null, null);
        mv.visitCode();
        mv.visitInsn(LCONST_0);
        mv.visitInsn(LRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
        mv = cw.visitMethod(0, "freturnInsn", "()F", null, null);
        mv.visitCode();
        mv.visitInsn(FCONST_0);
        mv.visitInsn(FRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
        mv = cw.visitMethod(0, "dreturnInsn", "()D", null, null);
        mv.visitCode();
        mv.visitInsn(DCONST_0);
        mv.visitInsn(DRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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        } catch (Exception e) {
        }
    }


    public void testIllegalFrameType() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(123, 0, null, 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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        } catch (Exception e) {
        }
    }


    public void testIllegalFrameLocalCount() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_SAME, 1, new Object[] { INTEGER }, 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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        } catch (Exception e) {
        }
    }


    public void testIllegalFrameStackCount() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_SAME, 0, null, 1, new Object[] { INTEGER });
            fail();
        } catch (Exception e) {
        }
    }

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        } catch (Exception e) {
        }
    }


    public void testIllegalFrameLocalArray() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_APPEND, 1, new Object[0], 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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        } catch (Exception e) {
        }
    }


    public void testIllegalFrameStackArray() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_SAME1, 0, null, 1, new Object[0]);
            fail();
        } catch (Exception e) {
        }
    }

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        } catch (Exception e) {
        }
    }


    public void testIllegalFrameValue() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_FULL, 1, new Object[] { "LC;" }, 0, null);
            fail();
        } catch (Exception e) {
        }
        try {
            mv.visitFrame(F_FULL, 1, new Object[] { new Integer(0) }, 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }


    private void fieldInsns(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "fieldInsns",
                "()V",
                null,
                null);
        mv.visitFieldInsn(GETSTATIC, "pkg/Insns", "s", "S");
        mv.visitFieldInsn(PUTSTATIC, "pkg/Insns", "s", "S");
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, "pkg/Insns", "i", "I");
        mv.visitFieldInsn(PUTFIELD, "pkg/Insns", "i", "I");
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, "pkg/Insns", "l", "J");
        mv.visitFieldInsn(PUTFIELD, "pkg/Insns", "l", "J");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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        } catch (Exception e) {
        }
    }


    public void testIllegalMethodInsn() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitInsn(-1);
            fail();
        } catch (Exception e) {
        }
    }

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