How is stack-trace constructed?

Andrew Haley aph at
Wed Jun 17 11:15:56 UTC 2015


On 06/17/2015 12:02 PM, Manas Thakur wrote:
> I haven’t done that (will do for sure if you suggest). But I thought
> this information must be available somewhere with a data structure
> in “ciMethod”. Can you tell if I am leading to the right direction?

No, those are compile-time structures.  The information you seek is in
the nmethod.  It has PcDescs which map a physical PC to the
corresponding source scope and bytecode index.  Once you have that
it's relatively easy.

Put a breakpoint on java_lang_Throwable::fill_in_stack_trace here:

        if (nm->method()->is_native()) {
          method = nm->method();
          bci = 0;
        } else {
          PcDesc* pd = nm->pc_desc_at(pc);
          decode_offset = pd->scope_decode_offset();
          // if decode_offset is not equal to 0, it will execute the
          // "compiled java method case" at the beginning of the loop.

and you can watch it happen.


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