RFR: 8262368: wrong verifier message for bogus return type [v2]

[Coleen Phillimore]

On Mon, 1 Mar 2021 16:04:17 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Please review this small change to fix some verifier error messages.  If a method's descriptor has a void return signature, but contains a bytecode such as 'ireturn' or 'areturn'. then it will get a VerifyError exception with the message "Method descriptor has a void return type".   Conversely, if a method's descriptor has a non-void return signature, but contains a 'return' bytecode then it will get a VerifyError exception with the message "Method descriptor has a non-void return type".
>> 
>> A sample error message looks like:
>> Error: Unable to initialize main class Hi
>> Caused by: java.lang.VerifyError: Method descriptor has a void return type
>> Exception Details:
>>   Location:
>>     Hi.noRet(I)V @1: ireturn
>>   Reason:
>>     Type integer (current frame, stack[0]) is not assignable to top (from method signature)
>>   Current Frame:
>>     bci: @1
>>     flags: { }
>>     locals: { integer }
>>     stack: { integer }
>>   Bytecode:
>>     0000000: 08ac
>> 
>> The fix was tested with Mach5 tiers 1 and 2 on Linux, Mac OS, and Windows, tiers 3-5 on Linux x64. and the JCK Lang and VM tests on Linux x64.
>> 
>> Thanks, Harold
>
> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   changed error message text

src/hotspot/share/classfile/verifier.cpp line 3149:

> 3147:     VerificationType return_type, VerificationType type, u2 bci,
> 3148:     StackMapFrame* current_frame, TRAPS) {
> 3149:   if (return_type == VerificationType::bogus_type()) {

return_type is the type expected from the function, which here is void (I guess void == bogus_type, but ok).
So the message is correct.

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PR: https://git.openjdk.java.net/jdk/pull/2757