Project

General

Profile

Actions

Bug #19456

closed

Incorrect line numbers in GC hook

Added by peterzhu2118 (Peter Zhu) over 1 year ago. Updated over 1 year ago.

Status:
Closed
Assignee:
-
Target version:
-
[ruby-core:112534]

Description

GitHub PR: https://github.com/ruby/ruby/pull/7357

If the previous instruction is not a leaf instruction, then the PC was incremented before the instruction was ran (meaning the currently executing instruction is actually the previous instruction), so we should not increment the PC otherwise we will calculate the source line for the next instruction.

This bug can be reproduced in the following script:

require "objspace"

ObjectSpace.trace_object_allocations_start
a =





  1.0 / 0.0
p [ObjectSpace.allocation_sourceline(a), ObjectSpace.allocation_sourcefile(a)]

Which outputs: [4, "test.rb"]

This is incorrect because the object was allocated on line 10 and not line 4. The behaviour is correct when we use a leaf instruction (e.g. if we replaced 1.0 / 0.0 with "hello"), then the output is: [10, "test.rb"].

Actions

Also available in: Atom PDF

Like1
Like0