[9] RFR(S): 8060215: per-method PrintIdealGraphLevel

[Zoltán Majó]

Hi,


please review the following patch.

Bug: https://bugs.openjdk.java.net/browse/JDK-8060215

Problem: Currently, printing the Ideal Graph can be only enabled for 
*all* methods compiled by the VM (by setting the PrintIdealGraphLevel 
flag). The overhead of printing the graph can be too high when a VM is 
debugged in a resource-constrained environment (e.g., limited network 
bandwidth, limited disk space, or a slow CPU is available). To reduce 
the overhed, it can be useful to produce the Ideal Graph only for a 
subset of all methods compiled. By doing that the size of the output 
file, the amount of data transferred on the network, and also the 
overhead of printing the graph is reduced.

Solution:

- Use CompileCommand=option to set PrintIdealGraphLevel on a per-method 
level.
- PrintIdealGraphLevel sets the level of detail for printing all other 
methods.
- Introduce a new develop flag PrintIdealGraph to control/check if 
printing the graph is enabled for any method. The old way of checking if 
PrintIdealGraphLevel > 0 to see if printing is enabled is not good 
enough, because PrintIdealGraphLevel flag can be 0 while 
PrintIdealGraphLevel can be set for some method.

Webrev: http://cr.openjdk.java.net/~zmajo/8060215/webrev.00/

Testing: JPRT, manual testing.

Thank you and best regards,


Zoltan