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如何检查 class 文件版本 50.0 (Java 6) 是否已经过预验证？

[英]How to check if a class file version 50.0 (Java 6) has been preverified?

原文 2011-05-28 14:06:35 3 1 java/ class/ scala/ bytecode/ verification

I "upgraded" some jar files from class file version 49.0 to 50.0 with ProGuard.我使用 ProGuard 将一些 jar 文件从 class 文件版本 49.0“升级”到 50.0。

Because preverification is optional with version 50.0, I wonder if there is a way to check if the class file has really an StackMapTable attribute in it.因为预验证在 50.0 版本中是可选的，所以我想知道是否有办法检查 class 文件中是否真的有 StackMapTable 属性。

(It's not that I don't trust ProGuard "[...] The following options upgrade class files to Java 6, by updating their internal version numbers and preverifying them." but I'd like to learn how to verify the existance of the StackMapTable.) （并不是说我不信任 ProGuard “[...] 以下选项将 class 文件升级到 Java 6，通过更新它们的内部版本号并预先验证它们。”但我想了解如何验证堆栈映射表。）

1 个解决方案

Javaasist has support for reviewing stack map tables. Javaasist支持查看堆栈 map 表。

The one other nugget I came across was java -XX:-FailOverToOldVerifier -Xverify:all which should only verify if there is SMT information in a 50+ version class file.我遇到的另一个金块是 java -XX:-FailOverToOldVerifier -Xverify:all 应该只验证 50+ 版本 class 文件中是否有 SMT 信息。 However, I haven't tried that and cant even tell you what it might look like on output.但是，我还没有尝试过，甚至不能告诉你它在 output 上会是什么样子。