How is stack-trace constructed? (original) (raw)

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

Hi,

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.

Andrew.

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