tool or option for viewing LIR nodes

Venkatachalam, Vasanth Vasanth.Venkatachalam at
Mon May 6 08:29:55 PDT 2013

Doug and Giles,

Here's the command line I'm using. 

tester at see-anna1:~/graalcloneinternal/graal$ ./  --vm server  --java-home /home/tester/graal/jdk1.7.0_13/debug -G:Dump= -G:+PrintCFG unittest BasicHSAILTest
mx: error: unrecognized arguments: -G:Dump= -G:+PrintCFG

Can someone explain what I'm doing wrong here?


-----Original Message-----
From: Doug Simon [mailto:doug.simon at] 
Sent: Saturday, May 04, 2013 4:47 PM
To: Venkatachalam, Vasanth
Cc: graal-dev at
Subject: Re: tool or option for viewing LIR nodes

As Gilles says, the -G options should work under --vm server. It helps if you post the complete command line you are using to see if we can spot a problem.


On May 4, 2013, at 10:02 PM, Gilles Duboscq <duboscq at> wrote:

> The server vm that contains Graal (--vm server) should definitely pick 
> up all -G options including -G:Dump= and -G:+PrintCFG.
> Since you are talking about unit tests i suppose you are using the 
> GraalCompilerTest's method to explicitly trigger compilation.
> I don't know how you are structuring your tests but there are some 
> "Debug scopes" that need to be properly set up for these flags to 
> work. Normally if you just make your test a subclass of 
> GraalCompilerTest and then use its methods if should be fine.
> On Sat, May 4, 2013 at 2:30 AM, Vasanth Venkatachalam < 
> Vasanth.Venkatachalam at> wrote:
>> Christian,
>> Some more context to my question.
>> I've added a Graal backend for HSAIL code generation. I'm debugging 
>> the codegen for a test case where running with the --vm server option 
>> produces some incorrect results.
>> Thus I'd like to view the nodes that are produced when running with 
>> the mx --vm server option.
>> It looks like the c1visualizer tool can't be used with --vm server. 
>> Is there another tool that can help?
>> I had a similar issue with the IdealGraphVisualizer. The -G:Dump= 
>> option isn't recognized when running with --vm server.
>> Vasanth
>> -----Original Message-----
>> From: graal-dev-bounces at [mailto:
>> graal-dev-bounces at] On Behalf Of Christian Wimmer
>> Sent: Friday, May 03, 2013 12:22 PM
>> To: graal-dev at
>> Subject: Re: tool or option for viewing LIR nodes
>> On 05/03/2013 09:23 AM, Venkatachalam, Vasanth wrote:
>>> Is there a tool or option that would allow us to view the LIR nodes 
>>> that
>> Graal generates for a program?
>> Yes.
>> Graal can output the graph, LIR, register allocator liveness 
>> information, and machine code in the format required by the Client Compiler Visualizer.
>> As the name implies, the tool was originally written to visualize the 
>> data structures of the Java HotSpot client compiler.
>> You can get it here:
>> The output is controlled the same ways as the output to the Ideal 
>> Graph Visualizer, i.e., the -G:Dump= flag.  In addition, I think you 
>> have to also pass -G:+PrintCFG
>> The tool is file-based, i.e., you get .cfg files in your working 
>> directory that you can load with the c1visualizer.
>> -Christian

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