[llvm-bugs] [Bug 32932] New: Debug information not processed if llvm-objdump reads input from standard input

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32932

            Bug ID: 32932
           Summary: Debug information not processed if llvm-objdump reads
                    input from standard input
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: ys114321 at gmail.com
                CC: llvm-bugs at lists.llvm.org

When I tried to write a C based unit test for one of BPF changes, I encountered
a problem where llvm-objdump does not process debug information in the .o file
properly. The following procedure can demonstrate the problem.

[yhs at devbig474.prn1 ~/work/debug_llvm/dwarf] cat test.c

int test(int *p) {
  *p = 2;
  return 1;
}
[yhs at devbig474.prn1 ~/work/debug_llvm/dwarf] clang -g -target bpf -O2 -c test.c
[yhs at devbig474.prn1 ~/work/debug_llvm/dwarf] llvm-objdump -S  test.o

test.o: file format ELF64-BPF

Disassembly of section .text:
test:
; int test(int *p) {
       0:       b7 02 00 00 02 00 00 00         r2 = 2
; *p = 2;
       1:       63 21 00 00 00 00 00 00         *(u32 *)(r1 + 0) = r2
; return 1;
       2:       b7 00 00 00 01 00 00 00         r0 = 1
       3:       95 00 00 00 00 00 00 00         exit
[yhs at devbig474.prn1 ~/work/debug_llvm/dwarf] llvm-objdump -S - < test.o

<stdin>:        file format ELF64-BPF

Disassembly of section .text:
test:
       0:       b7 02 00 00 02 00 00 00         r2 = 2
       1:       63 21 00 00 00 00 00 00         *(u32 *)(r1 + 0) = r2
       2:       b7 00 00 00 01 00 00 00         r0 = 1
       3:       95 00 00 00 00 00 00 00         exit
[yhs at devbig474.prn1 ~/work/debug_llvm/dwarf]

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