[llvm-bugs] [Bug 38635] New: llc doesn't generate correct addresses in .debug_addr table for 64bit addresses

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38635

            Bug ID: 38635
           Summary: llc doesn't generate correct addresses in .debug_addr
                    table for 64bit addresses
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: vleschuk at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20742
  --> https://bugs.llvm.org/attachment.cgi?id=20742&action=edit
source ll and produced asm

When trying to generate a 64bit object file from simple code:

void foo() {}
void bar() {}

An ll is attached. llc produces correct asm (looks good to me):

  .section  .debug_addr,"", at progbits                                            
  .quad .Lfunc_begin0                                                           
  .quad .Lfunc_begin1                                                           


However if we try to generate an object file:

./bin/llc -split-dwarf-file=test.dwo -dwarf-version=4 test.ll -filetype=obj
-mtriple=x86_64-unknown-linux-gnu -o test.o

And check it with llvm-dwarfdump, we see correct addresses for functions in
debug_info section:

0x00000019:   DW_TAG_subprogram
                DW_AT_low_pc    ( indexed (00000000) address =
0x0000000000000000)

0x00000024:   DW_TAG_subprogram
                DW_AT_low_pc    ( indexed (00000001) address =
0x0000000000000010)

But zero addresses in .debug_addr section:

.debug_addr contents:
Addr Section: length = 0x00000000, version = 0x0004, addr_size = 0x08, seg_size
= 0x00
Addrs: [
0x0000000000000000
0x0000000000000000
]


Does anyone have an idea where to start looking at?

PS: It looks like llvm-dwarfdump does read 64bit contents of .debug_addr
section: see test/tools/llvm-dwarfdump/X86/debug_addr_64bit_address.s

PPS: there is no such problem with 32bit addresses.

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