jetbrick-commons/src/main/java/jetbrick/reflect/ParameterInfo.java
private static void receiveParameterNames(final KlassInfo declaringklass) {
        if (declaringklass.getType().getClassLoader() == null) {
            // We can not find parameter name for class which is in JDK
            return;
        }

        ClassReader cr = null;
        try {
            InputStream stream = ClassLoaderUtils.getClassAsStream(declaringklass.getType());
            cr = new ClassReader(stream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        cr.accept(new ClassVisitor(Opcodes.ASM5) {
            @Override
            public MethodVisitor visitMethod(final int access, final String name, final String desc, final String signature, final String[] exceptions) {
                final MethodInfo method = searchMethod(declaringklass, name, desc);
                if (method == null) {
                    return super.visitMethod(access, name, desc, signature, exceptions);
                }

                MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
                return new MethodVisitor(Opcodes.ASM5, mv) {
                    List<ParameterInfo> parameters = method.getParameters();
                    boolean isStatic = method.isStatic();

                    @Override
                    public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
                        int offset = isStatic ? index : index - 1;
                        if (offset >= 0 && offset < parameters.size()) {
                            parameters.get(offset).name = name;
                        }
                        super.visitLocalVariable(name, desc, signature, start, end, index);
                    }

                    int visitParameterIndex = 0; // JDK8 parameter name 是按照循序存储的，这里需要一个计数器

                    @Override
                    public void visitParameter(String name, int access) {
                        parameters.get(visitParameterIndex++).name = name;
                        super.visitParameter(name, access);
                    }
                };
            }

            private MethodInfo searchMethod(KlassInfo declaringklass, String name, String desc) {
                if ("<cinit>".equals(name)) return null;
                if ("<init>".equals(name)) return null;

                jetbrick.asm.Type[] argumentTypes = jetbrick.asm.Type.getArgumentTypes(desc);
                for (MethodInfo method : declaringklass.getDeclaredMethods()) {
                    if (method.getName().equals(name) && argumentTypes.length == method.getParameterCount()) {
                        Class<?>[] types = method.getParameterTypes();
                        boolean matched = true;
                        for (int i = 0; i < argumentTypes.length; i++) {
                            if (!jetbrick.asm.Type.getType(types[i]).equals(argumentTypes[i])) {
                                matched = false;
                                break;
                            }
                        }
                        if (matched) {
                            return method;
                        }
                    }
                }
                return null;
            }
        }, ClassReader.SKIP_FRAMES);
    }
private static void receiveParameterNames(final KlassInfo declaringklass) {
        if (declaringklass.getType().getClassLoader() == null) {
            // We can not find parameter name for class which is in JDK
            return;
        }

        ClassReader cr = null;
        try {
            InputStream stream = ClassLoaderUtils.getClassAsStream(declaringklass.getType());
            cr = new ClassReader(stream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        cr.accept(new ClassVisitor(Opcodes.ASM5) {
            @Override
            public MethodVisitor visitMethod(final int access, final String name, final String desc, final String signature, final String[] exceptions) {
                final MethodInfo method = searchMethod(declaringklass, name, desc);
                if (method == null) {
                    return super.visitMethod(access, name, desc, signature, exceptions);
                }

                MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
                return new MethodVisitor(Opcodes.ASM5, mv) {
                    List<ParameterInfo> parameters = method.getParameters();
                    boolean isStatic = method.isStatic();

                    @Override
                    public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
                        int offset = isStatic ? index : index - 1;
                        if (offset >= 0 && offset < parameters.size()) {
                            parameters.get(offset).name = name;
                        }
                        super.visitLocalVariable(name, desc, signature, start, end, index);
                    }

                    int visitParameterIndex = 0; // JDK8 parameter name 是按照循序存储的，这里需要一个计数器

                    @Override
                    public void visitParameter(String name, int access) {
                        parameters.get(visitParameterIndex++).name = name;
                        super.visitParameter(name, access);
                    }
                };
            }

            private MethodInfo searchMethod(KlassInfo declaringklass, String name, String desc) {
                if ("<cinit>".equals(name)) return null;
                if ("<init>".equals(name)) return null;

                jetbrick.asm.Type[] argumentTypes = jetbrick.asm.Type.getArgumentTypes(desc);
                for (MethodInfo method : declaringklass.getDeclaredMethods()) {
                    if (method.getName().equals(name) && argumentTypes.length == method.getParameterCount()) {
                        Class<?>[] types = method.getParameterTypes();
                        boolean matched = true;
                        for (int i = 0; i < argumentTypes.length; i++) {
                            if (!jetbrick.asm.Type.getType(types[i]).equals(argumentTypes[i])) {
                                matched = false;
                                break;
                            }
                        }
                        if (matched) {
                            return method;
                        }
                    }
                }
                return null;
            }
        }, ClassReader.SKIP_FRAMES);
    }
使用 ASM 获取参数名称