Hello,

Using SpiderMonkey, I am trying to generate the Control Flow Graph (CFG) as 
explained here: 

https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Hacking_Tips#Hacking_tips

I am using the command:

IONFILTER=pdfjs.js:16934 IONFLAGS=logs,scripts,osi,bailouts ./js  
--ion-offthread-compile=off ./example.js 2>&1

However the files ion.json and cfg.json are not generated in /tmp/ as described 
in the documentation. 

Any idea what the problem is?

FYI, I have compiled SpiderMonkey 61 in debug mode (--enable-debug 
--disable-optimize)

Moreover, is there a way to run SpiderMonkey, generate the CFG graph but 
without executing the code? 

Thanks a lot. 
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