How to print value of a systemverilog class instance when a breakpoint is hit?

From the trials I made, it appears that the Tcl commands in the -exec string are being executed in the top-level module scope, not the context of where the breakpoint is hit (though I would defer to an expert to confirm/deny that). I was able to hack together a command that does what you want:

stop -create -line 308 -file  -all -$UVM_HOME/src/base/uvm_heartbeat.svh exec {regexp -line {, scope \((.*)\)} [where] m curscope; value $curscope.obj}

However I am wondering if you might be missing out on some of the objection tracing capability in the SimVision GUI. Can you describe the bigger picture of what you're trying to solve with this breakpoint? Maybe we can guide you to an easier solution...

StephanHyou're right in your observation that -exec is executed at the top module scope. To execute commands at the class scope, Cadence support proposed to inspect the variables after the break.

stop -create -line 308 -file $UVM_HOME/uvm-1.2/src/base/uvm_heartbeat.svh -all
while (1) {
    run;
    puts "obj is [value obj.m_name]"
    puts "target is [value target.m_name]"
}

see a working example here

That's OK, provided you don't want to set any other breakpoints, or do any interactive debug at the same time; the solution I proposed is more scalable and would not prevent you setting other breakpoints, single-stepping etc.

I agree

I agree