[llvm-bugs] [Bug 40591] New: Symbolizer should ignore undefined symbols

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40591

            Bug ID: 40591
           Summary: Symbolizer should ignore undefined symbols
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-symbolizer
          Assignee: unassignedbugs at nondot.org
          Reporter: jh7370.2008 at my.bristol.ac.uk
                CC: llvm-bugs at lists.llvm.org

llvm-symbolizer currently treats undefined symbols as symbols at address 0 and
so if 0 is specified as an input address, it will find that symbol, even if
there is a defined symbol at that location. I wrote a lit test to reproduce
this issue:

# symbolize-undef-syms.s
# REQUIRES: x86-registered-target

# RUN: llvm-mc --filetype=obj --triple=x86_64-pc-linux %s -o %t.o -g
# RUN: llvm-symbolizer --obj=%t.o 0 | FileCheck %s --implicit-check-not=bar

# CHECK:      foo
# CHECK-NEXT: symbolize-undef-syms.s:14:0

.type bar, at function
.type foo, at function
.global foo
foo:
    call bar

This test will fail because bar was picked instead of foo. It would be good to
never pick bar, even if there is no defined symbol, since bar cannot represent
that address.

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