The attached jasm source has a set of nop instructions between the jfqe instruction and the "SKIP" label that is used by it. The length of the set is 0x8FFF which exceeds allowed by JVMS - signed 16-bit value 0x8000. The jasm silently produces a class file that is declined by JVM:

>java Test
Error: Unable to initialize main class Test
Caused by: java.lang.VerifyError: (class: Test, method: test_1 signature: ()V) Illegal target of jump or branch

Since jasm allows to generate a "defect" binaries, it would be nice if the jasm assembler warns that already, and not just the class file verifier.

Expected warning should be like:

jasm - WARN: test_1()V The 'ifge' instruction uses the argument 0x8000 that exceeds allowed signed 16-bit value 0x7FFF
1 warning(s)