RFR: 8316197: Make tracing of inline cache available in unified logging [v2]

[Vladimir Kozlov]

On Fri, 8 Dec 2023 18:33:27 GMT, Yi-Fan Tsai <duke at openjdk.org> wrote:

>> This removes develop flag `TraceICs` and makes the logs available via `-Xlog`.
>> 
>> Example:
>> 
>> % java -Xlog:inlinecache=trace -version
>> [0.061s][trace][inlinecache] CompiledDirectStaticCall at 0x00007f3739001d17: set_to_interpreted java.lang.StringLatin1.hashCode([B)I
>> [0.078s][trace][inlinecache] IC at 0x00007f3739004a87: monomorphic to compiled (rcvr klass = nullptr)
>> [0.079s][trace][inlinecache] CompiledDirectStaticCall at 0x00007f3739005dff: set_to_interpreted jdk.internal.util.ArraysSupport.vectorizedHashCode(Ljava/lang/Object;IIII)I
>> [0.079s][trace][inlinecache] CompiledDirectStaticCall at 0x00007f373900502f: set_to_interpreted jdk.internal.org.objectweb.asm.ByteVector.enlarge(I)V
>> [0.079s][trace][inlinecache] IC at 0x00007f373900502f: monomorphic to interpreter: {method} {0x00007f36f03e6318} 'enlarge' '(I)V' in 'jdk/internal/org/objectweb/asm/ByteVector'
>> [0.079s][trace][inlinecache] CompiledDirectStaticCall at 0x00007f3739006b0f: set_to_compiled 0x00007f3739002120
>> [0.083s][trace][inlinecache] CompiledDirectStaticCall at 0x00007f373900928f: set_to_interpreted java.lang.AbstractStringBuilder.newCapacity(I)I
>> [0.083s][trace][inlinecache] IC at 0x00007f373900928f: monomorphic to interpreter: {method} {0x00007f36f00cd170} 'newCapacity' '(I)I' in 'java/lang/AbstractStringBuilder'
>> ...
>
> Yi-Fan Tsai has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update TestTraceICs

test/hotspot/jtreg/compiler/arguments/TestTraceICs.java line 28:

> 26:  * @bug 8217447
> 27:  * @summary Test running TraceICs enabled.
> 28:  * @run main/othervm compiler.arguments.TestTraceICs

I think you need to add `-Xlog:inlinecache=trace` flag to keep previous test's behavior and check your new code.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17026#discussion_r1420893410