PrintCFGToFile jvm option.. where to find a file printed?

[Christian Thalinger]

On Feb 14, 2012, at 1:25 PM, Maxym Pendyshchuk wrote:

> I made a debug build of OPENJDK 7.0.2 (for Ubuntu 11.10 OS, if matters). Now I want to see a control flow graph information, I run a command:
> 
> java -XX:+PrintCFGToFile Test
> 
> in console I get "VM option '+PrintCFGToFile'", but no file is created... In CFGPrinter (if I'm not wrong with class), I see that file has name output.cfg, I looked for such a file on the file system, but didn't find it. Do I miss additional options? In documentation I saw examples only with one option... Is it a bug, or I do something wrong? Thank you for any information..

It works for me:

$ java -XX:+PrintCompilation -XX:+PrintCFGToFile -version
    718    1       3       java.lang.String::equals (88 bytes)
openjdk version "1.7.0-ea"
OpenJDK Runtime Environment (build 1.7.0-ea-b221)
OpenJDK 64-Bit Server VM (build 23.0-b15-internal-jvmg, mixed mode)
$ cat output.cfg 
begin_compilation
  name " java.lang.String::equals"
  method "virtual jboolean java.lang.String.equals(jobject)"
  date 1329223300664
end_compilation
begin_cfg
  name "BlockListBuilder virtual jboolean java.lang.String.equals(jobject)"
  begin_block
    name "B0"
    from_bci 0
    to_bci -1
    predecessors 
    successors "B1" "B2" 
    xhandlers
    flags "std" 
  end_block
<snip>

Are you actually using C1?

-- Chris
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