RFR: 8295893: Improve printing of Constant Pool Cache Entries [v6]

[Matias Saavedra Silva]

> As an extension of [JDK-8292699](https://bugs.openjdk.org/browse/JDK-8292699), this aims to further improve the printing of Constant Pool Cache entries. The contents and flag are decoded into human readable text with an appendix printed as before.
> 
> The text format and contents are tentative, please review.
> 
> Here is an example output when using `findmethod()`:
> 
> "Executing findmethod"
> flags (bitmask):
>    0x01  - print names of methods
>    0x02  - print bytecodes
>    0x04  - print the address of bytecodes
>    0x08  - print info for invokedynamic
>    0x10  - print info for invokehandle
> 
> [  0] 0x0000000801000800 class Concat0 loader data: 0x00007ffff02ddeb0 for instance a 'jdk/internal/loader/ClassLoaders$AppClassLoader'{0x00000007fef59110}
> 0x00007fffa0400368 static method main : ([Ljava/lang/String;)V
>    0 iconst_0
>    1 istore_1
>    2 iload_1
>    3 iconst_2
>    4 if_icmpge 24
>    7 getstatic 7 <Concat0.s/Ljava/lang/String;> 
>   10 invokedynamic bsm=31 13 <makeConcatWithConstants(Ljava/lang/String;)Ljava/lang/String;>
>   BSM: REF_invokeStatic 32 <java/lang/invoke/StringConcatFactory.makeConcatWithConstants(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;> 
>   arguments[1] = {
>      000
>   }
>   ConstantPoolCacheEntry:   4
>  - this: 0x00007fffa0400570
>  - bytecode 1: invokedynamic ba
>  - bytecode 2: nop 00
>  - cp index:    13
>  - F1:  [   0x00000008000c8658]
>  - F2:  [   0x0000000000000003]
>  -     Method: 0x00000008000c8658 java.lang.Object java.lang.invoke.Invokers$Holder.linkToTargetMethod(java.lang.Object, java.lang.Object)
>  - flag values: [08|0|0|1|1|0|1|0|0|0|00|00|02]
>  - tos: object
>  - local signature: 1
>  - has appendix: 1
>  - forced virtual: 0
>  - final: 1
>  - virtual Final: 0
>  - resolution Failed: 0
>  - num Parameters: 02
>   Method: 0x00000008000c8658 java/lang/invoke/Invokers$Holder.linkToTargetMethod(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
>   appendix: java.lang.invoke.BoundMethodHandle$Species_LL 
> {0x000000011f021360} - klass: 'java/lang/invoke/BoundMethodHandle$Species_LL'
>  - ---- fields (total size 5 words):
>  - private 'customizationCount' 'B' @12  0 (0x00)
>  - private volatile 'updateInProgress' 'Z' @13  false (0x00)
>  - private final 'type' 'Ljava/lang/invoke/MethodType;' @16  a 'java/lang/invoke/MethodType'{0x000000011f0185b0} = (Ljava/lang/String;)Ljava/lang/String; (0x23e030b6)
>  - final 'form' 'Ljava/lang/invoke/LambdaForm;' @20  a 'java/lang/invoke/LambdaForm'{0x000000011f01df40} => a 'java/lang/invoke/MemberName'{0x000000011f0211e8} = {method} {0x00007fffa04012a8} 'invoke' '(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;' in 'java/lang/invoke/LambdaForm$MH+0x0000000801000400' (0x23e03be8)
>  - private 'asTypeCache' 'Ljava/lang/invoke/MethodHandle;' @24  NULL (0x00000000)
>  - private 'asTypeSoftCache' 'Ljava/lang/ref/SoftReference;' @28  NULL (0x00000000)
>  - final 'argL0' 'Ljava/lang/Object;' @32  a 'java/lang/invoke/DirectMethodHandle'{0x000000011f019b70} (0x23e0336e)
>  - final 'argL1' 'Ljava/lang/Object;' @36  "000"{0x000000011f0193d0} (0x23e0327a)
>                  -------------
>   15 putstatic 17 <Concat0.d/Ljava/lang/String;> 
>   18 iinc #1 1
>   21 goto 2
>   24 return

Matias Saavedra Silva has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Added gtest

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/10860/files
  - new: https://git.openjdk.org/jdk/pull/10860/files/83a6cced..f2cc1104

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10860&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10860&range=04-05

  Stats: 157 lines in 4 files changed: 81 ins; 64 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/10860.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10860/head:pull/10860

PR: https://git.openjdk.org/jdk/pull/10860