Integrated: 8333748: javap crash - Fatal error: Unmatched bit position 0x2 for location CLASS

[Chen Liang]

On Thu, 13 Jun 2024 17:50:38 GMT, Chen Liang <liach at openjdk.org> wrote:

> Currently, javap crashes for class files that have set non-zero values for undefined access flag bits, as `java.lang.reflect.AccessFlag.maskToAccessFlag` and `java.lang.classfile.AccessFlags.flags` fail. In contrast, the JVMS, though asking for these bits to be set to 0, requires VM to proceed and ignore these bits. javap should emulate the VM behavior and proceed rendering, ignoring these undefined bits.
> 
> In addition, a few bytecode generation utilities in the JDK set unused bits, such as in `java.lang.invoke.MethodHandleImpl.BindCaller#generateInvokerTemplate` and `java.lang.invoke.GenerateJLIClassesHelper#generateCodeBytesForLFs`. Those can be updated in a later cleanup.

This pull request has now been integrated.

Changeset: 7e55ed3b
Author:    Chen Liang <liach at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/7e55ed3b106ed08956d2d38b7c99fb81704667c9
Stats:     228 lines in 4 files changed: 168 ins; 44 del; 16 mod

8333748: javap crash - Fatal error: Unmatched bit position 0x2 for location CLASS

Reviewed-by: asotona

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PR: https://git.openjdk.org/jdk/pull/19708