[LLVMbugs] [Bug 18928] New: Integrated assembler outputs not-printable characters for private labels

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18928

            Bug ID: 18928
           Summary: Integrated assembler outputs not-printable characters
                    for private labels
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: dpeixott at codeaurora.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

When printing an assembly file with private labels the integrated assembler
will output non-printable characters for the generated private label names.

$ cat tt.s 
.syntax unified
foo:
  b 1f
1:
  add r0, r0, r0

$ llvm-mc -triple arm-none-linux < tt.s 
        .text
foo:
        b       ".L11"
".L11":
        add     r0, r0, r0

$ llvm-mc -triple arm-none-linux < tt.s | hexdump -C
00000000  09 2e 74 65 78 74 0a 66  6f 6f 3a 0a 09 62 09 22  |..text.foo:..b."|
00000010  2e 4c 31 02 31 22 0a 22  2e 4c 31 02 31 22 3a 0a  |.L1.1".".L1.1":.|
00000020  09 61 64 64 09 72 30 2c  20 72 30 2c 20 72 30 0a  |.add.r0, r0, r0.|
00000030  0a                                                |.|
00000031

The hexdump output shows that the generated label name "L11" contains the
non-printable character 0x02 between the two 1's in the label name.

We should not output non-printable characters when outputting to an assembly
text file.

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