llvm-dwarfdump: Add dwo parsing to --statistics.

[cmtice]

Summary

Add check for, and add parsing of, .dwo files to Statistics.cpp; create a new getNonSkeletonUnitDie function in DWARFUnit.h

[dblaikie]

Looks good - thanks!

include/llvm/DebugInfo/DWARF/DWARFUnit.h

390–394

LLVM style tends to omit {} on single line scopes, and to avoid using 'else' after a return or similar ( https://llvm.org/docs/CodingStandards.html#don-t-use-else-after-a-return ).

So this could be modified to:

if (DWO)
  return DWO->getUnitDIE
return getUnitDIE...

Alternatively, could use the conditional operator, ala:

return (DWO ? *DWO : *this).getUnitDIE(...);

(similar to the other use of parseDWO/pick-the-right-unit in DWARFUnit::getInlinedChainForAddress)

test/tools/llvm-dwarfdump/X86/statistics-dwo.test

11

(I'd generally suggest smaller/more targeted tests - rather than "here's a bunch of code and the statistics we expect for it" (a test that's small enough that most of the stats (the ones that aren't related to instruction counts) could be eyeballed/manually computed/verified easily enough - for instance the first test for statistics (test/tools/llvm-dwarfdump/X86/statistics.ll) explains the values of the various variable statistics)

Having a test with features designed for particular functionality makes test intentions easier to follow (for me, at least) - if bugs are found and numbers change or new statistics are added, it'll be easier to tell which parts of the behavior are intentional and which parts might've been accidentally over-fitted etc.)

But no worries in this instance - thoughts for future work.

[cmtice]

Committed in r360380.

include/llvm/DebugInfo/DWARF/DWARFUnit.h

public:
 
   DWARFDie getUnitDIE(bool ExtractUnitDIEOnly = true) {
     extractDIEsIfNeeded(ExtractUnitDIEOnly);
     if (DieArray.empty())
       return DWARFDie();
     return DWARFDie(this, &DieArray[0]);
   }
 
+  DWARFDie getNonSkeletonUnitDIE(bool ExtractUnitDIEOnly = true) {
+    parseDWO();
+    if (DWO) {
+      return DWO->getUnitDIE(ExtractUnitDIEOnly);
+    } else {
+      return getUnitDIE(ExtractUnitDIEOnly);
+    }
+  }
+
   const char *getCompilationDir();
   Optional<uint64_t> getDWOId() {
     extractDIEsIfNeeded(/*CUDieOnly*/ true);
     return getHeader().getDWOId();
   }
   void setDWOId(uint64_t NewID) { Header.setDWOId(NewID); }
 
   /// Return a vector of address ranges resulting from a (possibly encoded)

test/tools/llvm-dwarfdump/X86/Inputs/statistics-fib.split-dwarf.s

+  .text
+  .file "fibonacci.cc"
+  .globl  _Z8real_fibiPi          # -- Begin function _Z8real_fibiPi
+  .p2align  4, 0x90
+  .type _Z8real_fibiPi,@function
+_Z8real_fibiPi:                         # @_Z8real_fibiPi
+.Lfunc_begin0:
+  .file 1 "/usr/local/google3/cmtice/llvm.tot2/build/test/tools/llvm-dwarfdump/X86/Output/statistics-dwo.test.tmp" "fibonacci.cc"
+  .loc  1 5 0                   # fibonacci.cc:5:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  #DEBUG_VALUE: real_fib:x <- $edi
+  #DEBUG_VALUE: real_fib:answers <- $rsi
+  #DEBUG_VALUE: real_fib:x <- $edi
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  pushq %r14
+  .cfi_def_cfa_offset 24
+  pushq %rbx
+  .cfi_def_cfa_offset 32
+  .cfi_offset %rbx, -32
+  .cfi_offset %r14, -24
+  .cfi_offset %rbp, -16
+  .loc  1 8 7 prologue_end      # fibonacci.cc:8:7
+  movslq  %edi, %rbp
+  movl  (%rsi,%rbp,4), %eax
+  .loc  1 8 20 is_stmt 0        # fibonacci.cc:8:20
+  cmpl  $-1, %eax
+.Ltmp0:
+  .loc  1 8 7                   # fibonacci.cc:8:7
+  je  .LBB0_1
+.Ltmp1:
+# %bb.2:                                # %cleanup
+  #DEBUG_VALUE: real_fib:answers <- $rsi
+  #DEBUG_VALUE: real_fib:x <- $edi
+  .loc  1 15 1 is_stmt 1        # fibonacci.cc:15:1
+  popq  %rbx
+  .cfi_def_cfa_offset 24
+  popq  %r14
+  .cfi_def_cfa_offset 16
+  popq  %rbp
+  .cfi_def_cfa_offset 8
+  retq
+.Ltmp2:
+.LBB0_1:                                # %if.end
+  .cfi_def_cfa_offset 32
+  #DEBUG_VALUE: real_fib:answers <- $rsi
+  #DEBUG_VALUE: real_fib:x <- $edi
+  .loc  1 0 1 is_stmt 0         # fibonacci.cc:0:1
+  movq  %rsi, %rbx
+.Ltmp3:
+  #DEBUG_VALUE: real_fib:answers <- $rbx
+  .loc  1 11 22 is_stmt 1       # fibonacci.cc:11:22
+  leal  -1(%rbp), %edi
+.Ltmp4:
+  .loc  1 11 12 is_stmt 0       # fibonacci.cc:11:12
+  callq _Z8real_fibiPi
+  movl  %eax, %r14d
+  .loc  1 11 47                 # fibonacci.cc:11:47
+  leal  -2(%rbp), %edi
+  .loc  1 11 37                 # fibonacci.cc:11:37
+  movq  %rbx, %rsi
+  callq _Z8real_fibiPi
+  .loc  1 11 35                 # fibonacci.cc:11:35
+  addl  %r14d, %eax
+.Ltmp5:
+  #DEBUG_VALUE: real_fib:result <- $eax
+  .loc  1 12 16 is_stmt 1       # fibonacci.cc:12:16
+  movl  %eax, (%rbx,%rbp,4)
+  .loc  1 15 1                  # fibonacci.cc:15:1
+  popq  %rbx
+.Ltmp6:
+  .cfi_def_cfa_offset 24
+  popq  %r14
+  .cfi_def_cfa_offset 16
+  popq  %rbp
+  .cfi_def_cfa_offset 8
+  retq
+.Ltmp7:
+.Lfunc_end0:
+  .size _Z8real_fibiPi, .Lfunc_end0-_Z8real_fibiPi
+  .cfi_endproc
+                                        # -- End function
+  .globl  _Z3fibi                 # -- Begin function _Z3fibi
+  .p2align  4, 0x90
+  .type _Z3fibi,@function
+_Z3fibi:                                # @_Z3fibi
+.Lfunc_begin1:
+  .loc  1 19 0                  # fibonacci.cc:19:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  #DEBUG_VALUE: fib:x <- $edi
+  movl  $-1, %eax
+  #DEBUG_VALUE: fib:x <- $edi
+.Ltmp8:
+  .loc  1 23 9 prologue_end     # fibonacci.cc:23:9
+  cmpl  $10, %edi
+.Ltmp9:
+  .loc  1 23 7 is_stmt 0        # fibonacci.cc:23:7
+  jg  .LBB1_2
+.Ltmp10:
+# %bb.1:                                # %for.body.preheader
+  #DEBUG_VALUE: fib:x <- $edi
+  subq  $56, %rsp
+  .cfi_def_cfa_offset 64
+.Ltmp11:
+  .loc  1 27 16 is_stmt 1       # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+  movabsq $4294967296, %rax       # imm = 0x100000000
+.Ltmp12:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14                 # fibonacci.cc:29:14
+  movq  %rax, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  movq  %rsp, %rsi
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  callq _Z8real_fibiPi
+.Ltmp13:
+  .loc  1 0 10 is_stmt 0        # fibonacci.cc:0:10
+  addq  $56, %rsp
+  .cfi_def_cfa_offset 8
+.LBB1_2:                                # %cleanup
+  .loc  1 34 1 is_stmt 1        # fibonacci.cc:34:1
+  retq
+.Ltmp14:
+.Lfunc_end1:
+  .size _Z3fibi, .Lfunc_end1-_Z3fibi
+  .cfi_endproc
+                                        # -- End function
+  .globl  main                    # -- Begin function main
+  .p2align  4, 0x90
+  .type main,@function
+main:                                   # @main
+.Lfunc_begin2:
+  .loc  1 37 0                  # fibonacci.cc:37:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  #DEBUG_VALUE: main:argc <- $edi
+  #DEBUG_VALUE: main:argv <- $rsi
+  #DEBUG_VALUE: fib:x <- 3
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  pushq %r14
+  .cfi_def_cfa_offset 24
+  pushq %rbx
+  .cfi_def_cfa_offset 32
+  subq  $48, %rsp
+  .cfi_def_cfa_offset 80
+  .cfi_offset %rbx, -32
+  .cfi_offset %r14, -24
+  .cfi_offset %rbp, -16
+  .loc  1 27 16 prologue_end    # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+  movabsq $4294967296, %r14       # imm = 0x100000000
+.Ltmp15:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14                 # fibonacci.cc:29:14
+  movq  %r14, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  movq  %rsp, %rbx
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  movl  $3, %edi
+.Ltmp16:
+  movq  %rbx, %rsi
+.Ltmp17:
+  callq _Z8real_fibiPi
+.Ltmp18:
+  #DEBUG_VALUE: main:result <- $eax
+  .loc  1 41 3                  # fibonacci.cc:41:3
+  movl  $.L.str, %edi
+  movl  %eax, %esi
+  xorl  %eax, %eax
+.Ltmp19:
+  callq printf
+.Ltmp20:
+  .loc  1 27 16                 # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+.Ltmp21:
+  #DEBUG_VALUE: fib:x <- 4
+  .loc  1 27 16 is_stmt 0       # fibonacci.cc:27:16
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+.Ltmp22:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14 is_stmt 1       # fibonacci.cc:29:14
+  movq  %r14, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  movl  $4, %edi
+  movq  %rbx, %rsi
+  callq _Z8real_fibiPi
+.Ltmp23:
+  #DEBUG_VALUE: main:result <- $eax
+  .loc  1 43 3                  # fibonacci.cc:43:3
+  movl  $.L.str.1, %edi
+  movl  %eax, %esi
+  xorl  %eax, %eax
+.Ltmp24:
+  callq printf
+.Ltmp25:
+  .loc  1 27 16                 # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+.Ltmp26:
+  #DEBUG_VALUE: fib:x <- 5
+  .loc  1 27 16 is_stmt 0       # fibonacci.cc:27:16
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+.Ltmp27:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14 is_stmt 1       # fibonacci.cc:29:14
+  movq  %r14, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  movl  $5, %edi
+  movq  %rbx, %rsi
+  callq _Z8real_fibiPi
+.Ltmp28:
+  #DEBUG_VALUE: main:result <- $eax
+  .loc  1 45 3                  # fibonacci.cc:45:3
+  movl  $.L.str.2, %edi
+  movl  %eax, %esi
+  xorl  %eax, %eax
+.Ltmp29:
+  callq printf
+.Ltmp30:
+  .loc  1 27 16                 # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+.Ltmp31:
+  #DEBUG_VALUE: fib:x <- 6
+  .loc  1 27 16 is_stmt 0       # fibonacci.cc:27:16
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+.Ltmp32:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14 is_stmt 1       # fibonacci.cc:29:14
+  movq  %r14, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  movl  $6, %edi
+  movq  %rbx, %rsi
+  callq _Z8real_fibiPi
+.Ltmp33:
+  #DEBUG_VALUE: main:result <- $eax
+  .loc  1 47 3                  # fibonacci.cc:47:3
+  movl  $.L.str.3, %edi
+  movl  %eax, %esi
+  xorl  %eax, %eax
+.Ltmp34:
+  callq printf
+.Ltmp35:
+  .loc  1 27 16                 # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+.Ltmp36:
+  #DEBUG_VALUE: fib:x <- 7
+  .loc  1 27 16 is_stmt 0       # fibonacci.cc:27:16
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+.Ltmp37:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14 is_stmt 1       # fibonacci.cc:29:14
+  movq  %r14, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  movl  $7, %edi
+  movq  %rbx, %rsi
+  callq _Z8real_fibiPi
+.Ltmp38:
+  #DEBUG_VALUE: main:result <- $eax
+  .loc  1 49 3                  # fibonacci.cc:49:3
+  movl  $.L.str.4, %edi
+  movl  %eax, %esi
+  xorl  %eax, %eax
+.Ltmp39:
+  callq printf
+.Ltmp40:
+  .loc  1 27 16                 # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+.Ltmp41:
+  #DEBUG_VALUE: fib:x <- 8
+  .loc  1 27 16 is_stmt 0       # fibonacci.cc:27:16
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+.Ltmp42:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14 is_stmt 1       # fibonacci.cc:29:14
+  movq  %r14, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  movl  $8, %edi
+  movq  %rbx, %rsi
+  callq _Z8real_fibiPi
+  movl  %eax, %ebp
+.Ltmp43:
+  #DEBUG_VALUE: main:result <- $ebp
+  .loc  1 51 3                  # fibonacci.cc:51:3
+  movl  $.L.str.5, %edi
+  movl  %eax, %esi
+  xorl  %eax, %eax
+  callq printf
+  .loc  1 52 3                  # fibonacci.cc:52:3
+  movl  $.L.str.6, %edi
+  movl  %ebp, %esi
+  xorl  %eax, %eax
+  callq printf
+.Ltmp44:
+  .loc  1 27 16                 # fibonacci.cc:27:16
+  pcmpeqd %xmm0, %xmm0
+.Ltmp45:
+  #DEBUG_VALUE: fib:x <- 10
+  .loc  1 27 16 is_stmt 0       # fibonacci.cc:27:16
+  movdqa  %xmm0, (%rsp)
+  movdqu  %xmm0, 28(%rsp)
+  movdqa  %xmm0, 16(%rsp)
+.Ltmp46:
+  #DEBUG_VALUE: fib:i <- undef
+  #DEBUG_VALUE: fib:i <- [DW_OP_plus_uconst 1, DW_OP_stack_value] undef
+  .loc  1 29 14 is_stmt 1       # fibonacci.cc:29:14
+  movq  %r14, (%rsp)
+  .loc  1 31 14                 # fibonacci.cc:31:14
+  movl  $1, 8(%rsp)
+  .loc  1 33 10                 # fibonacci.cc:33:10
+  movl  $10, %edi
+  movq  %rbx, %rsi
+  callq _Z8real_fibiPi
+.Ltmp47:
+  #DEBUG_VALUE: main:result <- $eax
+  .loc  1 54 3                  # fibonacci.cc:54:3
+  movl  $.L.str.7, %edi
+  movl  %eax, %esi
+  xorl  %eax, %eax
+.Ltmp48:
+  callq printf
+  .loc  1 56 3                  # fibonacci.cc:56:3
+  xorl  %eax, %eax
+  addq  $48, %rsp
+  .cfi_def_cfa_offset 32
+  popq  %rbx
+  .cfi_def_cfa_offset 24
+  popq  %r14
+  .cfi_def_cfa_offset 16
+  popq  %rbp
+  .cfi_def_cfa_offset 8
+  retq
+.Ltmp49:
+.Lfunc_end2:
+  .size main, .Lfunc_end2-main
+  .cfi_endproc
+                                        # -- End function
+  .type .L.str,@object          # @.str
+  .section  .rodata.str1.1,"aMS",@progbits,1
+.L.str:
+  .asciz  "fibonacci(3) = %d\n"
+  .size .L.str, 19
+
+  .type .L.str.1,@object        # @.str.1
+.L.str.1:
+  .asciz  "fibonacci(4) = %d\n"
+  .size .L.str.1, 19
+
+  .type .L.str.2,@object        # @.str.2
+.L.str.2:
+  .asciz  "fibonacci(5) = %d\n"
+  .size .L.str.2, 19
+
+  .type .L.str.3,@object        # @.str.3
+.L.str.3:
+  .asciz  "fibonacci(6) = %d\n"
+  .size .L.str.3, 19
+
+  .type .L.str.4,@object        # @.str.4
+.L.str.4:
+  .asciz  "fibonacci(7) = %d\n"
+  .size .L.str.4, 19
+
+  .type .L.str.5,@object        # @.str.5
+.L.str.5:
+  .asciz  "fibonacci(8) = %d\n"
+  .size .L.str.5, 19
+
+  .type .L.str.6,@object        # @.str.6
+.L.str.6:
+  .asciz  "fibonacci(9) = %d\n"
+  .size .L.str.6, 19
+
+  .type .L.str.7,@object        # @.str.7
+.L.str.7:
+  .asciz  "fibonacci(10) = %d\n"
+  .size .L.str.7, 20
+
+  .section  .debug_str,"MS",@progbits,1
+.Lskel_string0:
+  .asciz  "/usr/local/google3/cmtice/llvm.tot2/build/test/tools/llvm-dwarfdump/X86/Output/statistics-dwo.test.tmp" # string offset=0
+.Lskel_string1:
+  .asciz  "fib"                   # string offset=71
+.Lskel_string2:
+  .asciz  "main"                  # string offset=75
+.Lskel_string3:
+  .asciz  "statistics-fib.split-dwarf.dwo" # string offset=80
+  .section  .debug_loc.dwo,"e",@progbits
+.Ldebug_loc0:
+  .byte 3
+  .byte 0
+  .long .Ltmp4-.Lfunc_begin0
+  .short  1                       # Loc expr size
+  .byte 85                      # super-register DW_OP_reg5
+  .byte 0
+.Ldebug_loc1:
+  .byte 3
+  .byte 0
+  .long .Ltmp3-.Lfunc_begin0
+  .short  1                       # Loc expr size
+  .byte 84                      # DW_OP_reg4
+  .byte 3
+  .byte 9
+  .long .Ltmp6-.Ltmp3
+  .short  1                       # Loc expr size
+  .byte 83                      # DW_OP_reg3
+  .byte 0
+.Ldebug_loc2:
+  .byte 3
+  .byte 10
+  .long .Lfunc_end0-.Ltmp5
+  .short  1                       # Loc expr size
+  .byte 80                      # super-register DW_OP_reg0
+  .byte 0
+.Ldebug_loc3:
+  .byte 3
+  .byte 1
+  .long .Ltmp13-.Lfunc_begin1
+  .short  1                       # Loc expr size
+  .byte 85                      # super-register DW_OP_reg5
+  .byte 0
+.Ldebug_loc4:
+  .byte 3
+  .byte 2
+  .long .Ltmp16-.Lfunc_begin2
+  .short  1                       # Loc expr size
+  .byte 85                      # super-register DW_OP_reg5
+  .byte 0
+.Ldebug_loc5:
+  .byte 3
+  .byte 2
+  .long .Ltmp17-.Lfunc_begin2
+  .short  1                       # Loc expr size
+  .byte 84                      # DW_OP_reg4
+  .byte 0
+.Ldebug_loc6:
+  .byte 3
+  .byte 11
+  .long .Ltmp19-.Ltmp18
+  .short  1                       # Loc expr size
+  .byte 80                      # super-register DW_OP_reg0
+  .byte 3
+  .byte 12
+  .long .Ltmp24-.Ltmp23
+  .short  1                       # Loc expr size
+  .byte 80                      # super-register DW_OP_reg0
+  .byte 3
+  .byte 13
+  .long .Ltmp29-.Ltmp28
+  .short  1                       # Loc expr size
+  .byte 80                      # super-register DW_OP_reg0
+  .byte 3
+  .byte 14
+  .long .Ltmp34-.Ltmp33
+  .short  1                       # Loc expr size
+  .byte 80                      # super-register DW_OP_reg0
+  .byte 3
+  .byte 15
+  .long .Ltmp39-.Ltmp38
+  .short  1                       # Loc expr size
+  .byte 80                      # super-register DW_OP_reg0
+  .byte 3
+  .byte 16
+  .long .Ltmp47-.Ltmp43
+  .short  1                       # Loc expr size
+  .byte 86                      # super-register DW_OP_reg6
+  .byte 3
+  .byte 17
+  .long .Ltmp48-.Ltmp47
+  .short  1                       # Loc expr size
+  .byte 80                      # super-register DW_OP_reg0
+  .byte 0
+.Ldebug_loc7:
+  .byte 3
+  .byte 3
+  .long .Lfunc_end2-.Ltmp21
+  .short  3                       # Loc expr size
+  .byte 17                      # DW_OP_consts
+  .byte 4                       # 4
+  .byte 159                     # DW_OP_stack_value
+  .byte 0
+.Ldebug_loc8:
+  .byte 3
+  .byte 4
+  .long .Lfunc_end2-.Ltmp26
+  .short  3                       # Loc expr size
+  .byte 17                      # DW_OP_consts
+  .byte 5                       # 5
+  .byte 159                     # DW_OP_stack_value
+  .byte 0
+.Ldebug_loc9:
+  .byte 3
+  .byte 5
+  .long .Lfunc_end2-.Ltmp31
+  .short  3                       # Loc expr size
+  .byte 17                      # DW_OP_consts
+  .byte 6                       # 6
+  .byte 159                     # DW_OP_stack_value
+  .byte 0
+.Ldebug_loc10:
+  .byte 3
+  .byte 6
+  .long .Lfunc_end2-.Ltmp36
+  .short  3                       # Loc expr size
+  .byte 17                      # DW_OP_consts
+  .byte 7                       # 7
+  .byte 159                     # DW_OP_stack_value
+  .byte 0
+.Ldebug_loc11:
+  .byte 3
+  .byte 7
+  .long .Lfunc_end2-.Ltmp41
+  .short  3                       # Loc expr size
+  .byte 17                      # DW_OP_consts
+  .byte 8                       # 8
+  .byte 159                     # DW_OP_stack_value
+  .byte 0
+.Ldebug_loc12:
+  .byte 3
+  .byte 8
+  .long .Lfunc_end2-.Ltmp45
+  .short  3                       # Loc expr size
+  .byte 17                      # DW_OP_consts
+  .byte 10                      # 10
+  .byte 159                     # DW_OP_stack_value
+  .byte 0
+  .section  .debug_abbrev,"",@progbits
+  .byte 1                       # Abbreviation Code
+  .byte 17                      # DW_TAG_compile_unit
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 16                      # DW_AT_stmt_list
+  .byte 23                      # DW_FORM_sec_offset
+# .byte 27                      # DW_AT_comp_dir
+# .byte 14                      # DW_FORM_strp
+  .ascii  "\264B"                 # DW_AT_GNU_pubnames
+  .byte 25                      # DW_FORM_flag_present
+  .ascii  "\260B"                 # DW_AT_GNU_dwo_name
+  .byte 14                      # DW_FORM_strp
+  .ascii  "\261B"                 # DW_AT_GNU_dwo_id
+  .byte 7                       # DW_FORM_data8
+  .ascii  "\262B"                 # DW_AT_GNU_ranges_base
+  .byte 23                      # DW_FORM_sec_offset
+  .ascii  "\263B"                 # DW_AT_GNU_addr_base
+  .byte 23                      # DW_FORM_sec_offset
+  .byte 17                      # DW_AT_low_pc
+  .byte 1                       # DW_FORM_addr
+  .byte 18                      # DW_AT_high_pc
+  .byte 6                       # DW_FORM_data4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 2                       # Abbreviation Code
+  .byte 46                      # DW_TAG_subprogram
+  .byte 0                       # DW_CHILDREN_no
+  .byte 3                       # DW_AT_name
+  .byte 14                      # DW_FORM_strp
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 3                       # Abbreviation Code
+  .byte 46                      # DW_TAG_subprogram
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 17                      # DW_AT_low_pc
+  .byte 1                       # DW_FORM_addr
+  .byte 18                      # DW_AT_high_pc
+  .byte 6                       # DW_FORM_data4
+  .byte 3                       # DW_AT_name
+  .byte 14                      # DW_FORM_strp
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 4                       # Abbreviation Code
+  .byte 29                      # DW_TAG_inlined_subroutine
+  .byte 0                       # DW_CHILDREN_no
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 85                      # DW_AT_ranges
+  .byte 23                      # DW_FORM_sec_offset
+  .byte 88                      # DW_AT_call_file
+  .byte 11                      # DW_FORM_data1
+  .byte 89                      # DW_AT_call_line
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 5                       # Abbreviation Code
+  .byte 29                      # DW_TAG_inlined_subroutine
+  .byte 0                       # DW_CHILDREN_no
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 17                      # DW_AT_low_pc
+  .byte 1                       # DW_FORM_addr
+  .byte 18                      # DW_AT_high_pc
+  .byte 6                       # DW_FORM_data4
+  .byte 88                      # DW_AT_call_file
+  .byte 11                      # DW_FORM_data1
+  .byte 89                      # DW_AT_call_line
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 0                       # EOM(3)
+  .section  .debug_info,"",@progbits
+.Lcu_begin0:
+  .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+  .short  4                       # DWARF version number
+  .long .debug_abbrev           # Offset Into Abbrev. Section
+  .byte 8                       # Address Size (in bytes)
+  .byte 1                       # Abbrev [1] 0xb:0xbe DW_TAG_compile_unit
+  .long .Lline_table_start0     # DW_AT_stmt_list
+# .long .Lskel_string0          # DW_AT_comp_dir
+                                        # DW_AT_GNU_pubnames
+  .long .Lskel_string3          # DW_AT_GNU_dwo_name
+  .quad -7268627715780183436    # DW_AT_GNU_dwo_id
+  .long .debug_ranges           # DW_AT_GNU_ranges_base
+  .long .Laddr_table_base0      # DW_AT_GNU_addr_base
+  .quad .Lfunc_begin0           # DW_AT_low_pc
+  .long .Lfunc_end2-.Lfunc_begin0 # DW_AT_high_pc
+  .byte 2                       # Abbrev [2] 0x34:0x5 DW_TAG_subprogram
+  .long .Lskel_string1          # DW_AT_name
+  .byte 3                       # Abbrev [3] 0x39:0x8f DW_TAG_subprogram
+  .quad .Lfunc_begin2           # DW_AT_low_pc
+  .long .Lfunc_end2-.Lfunc_begin2 # DW_AT_high_pc
+  .long .Lskel_string2          # DW_AT_name
+  .byte 4                       # Abbrev [4] 0x4a:0xb DW_TAG_inlined_subroutine
+  .long 52                      # DW_AT_abstract_origin
+  .long .Ldebug_ranges1         # DW_AT_ranges
+  .byte 1                       # DW_AT_call_file
+  .byte 40                      # DW_AT_call_line
+  .byte 5                       # Abbrev [5] 0x55:0x13 DW_TAG_inlined_subroutine
+  .long 52                      # DW_AT_abstract_origin
+  .quad .Ltmp21                 # DW_AT_low_pc
+  .long .Ltmp23-.Ltmp21         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 42                      # DW_AT_call_line
+  .byte 5                       # Abbrev [5] 0x68:0x13 DW_TAG_inlined_subroutine
+  .long 52                      # DW_AT_abstract_origin
+  .quad .Ltmp26                 # DW_AT_low_pc
+  .long .Ltmp28-.Ltmp26         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 44                      # DW_AT_call_line
+  .byte 5                       # Abbrev [5] 0x7b:0x13 DW_TAG_inlined_subroutine
+  .long 52                      # DW_AT_abstract_origin
+  .quad .Ltmp31                 # DW_AT_low_pc
+  .long .Ltmp33-.Ltmp31         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 46                      # DW_AT_call_line
+  .byte 5                       # Abbrev [5] 0x8e:0x13 DW_TAG_inlined_subroutine
+  .long 52                      # DW_AT_abstract_origin
+  .quad .Ltmp36                 # DW_AT_low_pc
+  .long .Ltmp38-.Ltmp36         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 48                      # DW_AT_call_line
+  .byte 5                       # Abbrev [5] 0xa1:0x13 DW_TAG_inlined_subroutine
+  .long 52                      # DW_AT_abstract_origin
+  .quad .Ltmp41                 # DW_AT_low_pc
+  .long .Ltmp43-.Ltmp41         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 50                      # DW_AT_call_line
+  .byte 5                       # Abbrev [5] 0xb4:0x13 DW_TAG_inlined_subroutine
+  .long 52                      # DW_AT_abstract_origin
+  .quad .Ltmp45                 # DW_AT_low_pc
+  .long .Ltmp47-.Ltmp45         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 53                      # DW_AT_call_line
+  .byte 0                       # End Of Children Mark
+  .byte 0                       # End Of Children Mark
+.Ldebug_info_end0:
+  .section  .debug_ranges,"",@progbits
+.Ldebug_ranges0:
+  .quad .Lfunc_begin2-.Lfunc_begin0
+  .quad .Ltmp18-.Lfunc_begin0
+  .quad .Ltmp20-.Lfunc_begin0
+  .quad .Ltmp21-.Lfunc_begin0
+  .quad .Ltmp25-.Lfunc_begin0
+  .quad .Ltmp26-.Lfunc_begin0
+  .quad .Ltmp30-.Lfunc_begin0
+  .quad .Ltmp31-.Lfunc_begin0
+  .quad .Ltmp35-.Lfunc_begin0
+  .quad .Ltmp36-.Lfunc_begin0
+  .quad .Ltmp40-.Lfunc_begin0
+  .quad .Ltmp41-.Lfunc_begin0
+  .quad .Ltmp44-.Lfunc_begin0
+  .quad .Ltmp45-.Lfunc_begin0
+  .quad 0
+  .quad 0
+.Ldebug_ranges1:
+  .quad .Lfunc_begin2-.Lfunc_begin0
+  .quad .Ltmp18-.Lfunc_begin0
+  .quad .Ltmp20-.Lfunc_begin0
+  .quad .Ltmp21-.Lfunc_begin0
+  .quad .Ltmp25-.Lfunc_begin0
+  .quad .Ltmp26-.Lfunc_begin0
+  .quad .Ltmp30-.Lfunc_begin0
+  .quad .Ltmp31-.Lfunc_begin0
+  .quad .Ltmp35-.Lfunc_begin0
+  .quad .Ltmp36-.Lfunc_begin0
+  .quad .Ltmp40-.Lfunc_begin0
+  .quad .Ltmp41-.Lfunc_begin0
+  .quad .Ltmp44-.Lfunc_begin0
+  .quad .Ltmp45-.Lfunc_begin0
+  .quad 0
+  .quad 0
+  .section  .debug_macinfo,"",@progbits
+  .byte 0                       # End Of Macro List Mark
+  .section  .debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+  .asciz  "_Z3fibi"               # string offset=0
+.Linfo_string1:
+  .asciz  "fib"                   # string offset=8
+.Linfo_string2:
+  .asciz  "int"                   # string offset=12
+.Linfo_string3:
+  .asciz  "x"                     # string offset=16
+.Linfo_string4:
+  .asciz  "answers"               # string offset=18
+.Linfo_string5:
+  .asciz  "__ARRAY_SIZE_TYPE__"   # string offset=26
+.Linfo_string6:
+  .asciz  "i"                     # string offset=46
+.Linfo_string7:
+  .asciz  "_Z8real_fibiPi"        # string offset=48
+.Linfo_string8:
+  .asciz  "real_fib"              # string offset=63
+.Linfo_string9:
+  .asciz  "main"                  # string offset=72
+.Linfo_string10:
+  .asciz  "result"                # string offset=77
+.Linfo_string11:
+  .asciz  "argc"                  # string offset=84
+.Linfo_string12:
+  .asciz  "argv"                  # string offset=89
+.Linfo_string13:
+  .asciz  "char"                  # string offset=94
+.Linfo_string14:
+  .asciz  "clang version 9.0.0 (trunk 358316)" # string offset=99
+.Linfo_string15:
+  .asciz  "fibonacci.cc"          # string offset=134
+.Linfo_string16:
+  .asciz  "statistics-fib.split-dwarf.dwo" # string offset=147
+  .section  .debug_str_offsets.dwo,"e",@progbits
+  .long 0
+  .long 8
+  .long 12
+  .long 16
+  .long 18
+  .long 26
+  .long 46
+  .long 48
+  .long 63
+  .long 72
+  .long 77
+  .long 84
+  .long 89
+  .long 94
+  .long 99
+  .long 134
+  .long 147
+  .section  .debug_info.dwo,"e",@progbits
+  .long .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit
+.Ldebug_info_dwo_start0:
+  .short  4                       # DWARF version number
+  .long 0                       # Offset Into Abbrev. Section
+  .byte 8                       # Address Size (in bytes)
+  .byte 1                       # Abbrev [1] 0xb:0x1d6 DW_TAG_compile_unit
+  .byte 14                      # DW_AT_producer
+  .short  4                       # DW_AT_language
+  .byte 15                      # DW_AT_name
+  .byte 16                      # DW_AT_GNU_dwo_name
+  .quad -7268627715780183436    # DW_AT_GNU_dwo_id
+  .byte 2                       # Abbrev [2] 0x19:0x35 DW_TAG_subprogram
+  .byte 0                       # DW_AT_low_pc
+  .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+  .byte 1                       # DW_AT_frame_base
+  .byte 87
+  .byte 7                       # DW_AT_linkage_name
+  .byte 8                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 4                       # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+                                        # DW_AT_external
+  .byte 3                       # Abbrev [3] 0x29:0xc DW_TAG_formal_parameter
+  .long .Ldebug_loc0-.debug_loc.dwo # DW_AT_location
+  .byte 3                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 4                       # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+  .byte 3                       # Abbrev [3] 0x35:0xc DW_TAG_formal_parameter
+  .long .Ldebug_loc1-.debug_loc.dwo # DW_AT_location
+  .byte 4                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 4                       # DW_AT_decl_line
+  .long 461                     # DW_AT_type
+  .byte 4                       # Abbrev [4] 0x41:0xc DW_TAG_variable
+  .long .Ldebug_loc2-.debug_loc.dwo # DW_AT_location
+  .byte 10                      # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 6                       # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+  .byte 0                       # End Of Children Mark
+  .byte 5                       # Abbrev [5] 0x4e:0x23 DW_TAG_subprogram
+  .byte 1                       # DW_AT_low_pc
+  .long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
+  .byte 1                       # DW_AT_frame_base
+  .byte 87
+  .long 113                     # DW_AT_abstract_origin
+  .byte 6                       # Abbrev [6] 0x5a:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc3-.debug_loc.dwo # DW_AT_location
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0x63:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0x6b:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 9                       # Abbrev [9] 0x71:0x23 DW_TAG_subprogram
+  .byte 0                       # DW_AT_linkage_name
+  .byte 1                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 18                      # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+                                        # DW_AT_external
+  .byte 1                       # DW_AT_inline
+  .byte 10                      # Abbrev [10] 0x7b:0x8 DW_TAG_formal_parameter
+  .byte 3                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 18                      # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+  .byte 11                      # Abbrev [11] 0x83:0x8 DW_TAG_variable
+  .byte 4                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 20                      # DW_AT_decl_line
+  .long 152                     # DW_AT_type
+  .byte 11                      # Abbrev [11] 0x8b:0x8 DW_TAG_variable
+  .byte 6                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 21                      # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+  .byte 0                       # End Of Children Mark
+  .byte 12                      # Abbrev [12] 0x94:0x4 DW_TAG_base_type
+  .byte 2                       # DW_AT_name
+  .byte 5                       # DW_AT_encoding
+  .byte 4                       # DW_AT_byte_size
+  .byte 13                      # Abbrev [13] 0x98:0xc DW_TAG_array_type
+  .long 148                     # DW_AT_type
+  .byte 14                      # Abbrev [14] 0x9d:0x6 DW_TAG_subrange_type
+  .long 164                     # DW_AT_type
+  .byte 11                      # DW_AT_count
+  .byte 0                       # End Of Children Mark
+  .byte 15                      # Abbrev [15] 0xa4:0x4 DW_TAG_base_type
+  .byte 5                       # DW_AT_name
+  .byte 8                       # DW_AT_byte_size
+  .byte 7                       # DW_AT_encoding
+  .byte 16                      # Abbrev [16] 0xa8:0x125 DW_TAG_subprogram
+  .byte 2                       # DW_AT_low_pc
+  .long .Lfunc_end2-.Lfunc_begin2 # DW_AT_high_pc
+  .byte 1                       # DW_AT_frame_base
+  .byte 87
+  .byte 9                       # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 36                      # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+                                        # DW_AT_external
+  .byte 3                       # Abbrev [3] 0xb7:0xc DW_TAG_formal_parameter
+  .long .Ldebug_loc4-.debug_loc.dwo # DW_AT_location
+  .byte 11                      # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 36                      # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+  .byte 3                       # Abbrev [3] 0xc3:0xc DW_TAG_formal_parameter
+  .long .Ldebug_loc5-.debug_loc.dwo # DW_AT_location
+  .byte 12                      # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 36                      # DW_AT_decl_line
+  .long 466                     # DW_AT_type
+  .byte 4                       # Abbrev [4] 0xcf:0xc DW_TAG_variable
+  .long .Ldebug_loc6-.debug_loc.dwo # DW_AT_location
+  .byte 10                      # DW_AT_name
+  .byte 1                       # DW_AT_decl_file
+  .byte 38                      # DW_AT_decl_line
+  .long 148                     # DW_AT_type
+  .byte 17                      # Abbrev [17] 0xdb:0x1f DW_TAG_inlined_subroutine
+  .long 113                     # DW_AT_abstract_origin
+  .long .Ldebug_ranges0-.debug_ranges # DW_AT_ranges
+  .byte 1                       # DW_AT_call_file
+  .byte 40                      # DW_AT_call_line
+  .byte 18                      # Abbrev [18] 0xe6:0x6 DW_TAG_formal_parameter
+  .byte 3                       # DW_AT_const_value
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0xec:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0xf4:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 19                      # Abbrev [19] 0xfa:0x23 DW_TAG_inlined_subroutine
+  .long 113                     # DW_AT_abstract_origin
+  .byte 3                       # DW_AT_low_pc
+  .long .Ltmp23-.Ltmp21         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 42                      # DW_AT_call_line
+  .byte 6                       # Abbrev [6] 0x106:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc7-.debug_loc.dwo # DW_AT_location
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0x10f:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0x117:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 19                      # Abbrev [19] 0x11d:0x23 DW_TAG_inlined_subroutine
+  .long 113                     # DW_AT_abstract_origin
+  .byte 4                       # DW_AT_low_pc
+  .long .Ltmp28-.Ltmp26         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 44                      # DW_AT_call_line
+  .byte 6                       # Abbrev [6] 0x129:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc8-.debug_loc.dwo # DW_AT_location
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0x132:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0x13a:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 19                      # Abbrev [19] 0x140:0x23 DW_TAG_inlined_subroutine
+  .long 113                     # DW_AT_abstract_origin
+  .byte 5                       # DW_AT_low_pc
+  .long .Ltmp33-.Ltmp31         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 46                      # DW_AT_call_line
+  .byte 6                       # Abbrev [6] 0x14c:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc9-.debug_loc.dwo # DW_AT_location
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0x155:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0x15d:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 19                      # Abbrev [19] 0x163:0x23 DW_TAG_inlined_subroutine
+  .long 113                     # DW_AT_abstract_origin
+  .byte 6                       # DW_AT_low_pc
+  .long .Ltmp38-.Ltmp36         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 48                      # DW_AT_call_line
+  .byte 6                       # Abbrev [6] 0x16f:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc10-.debug_loc.dwo # DW_AT_location
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0x178:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0x180:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 19                      # Abbrev [19] 0x186:0x23 DW_TAG_inlined_subroutine
+  .long 113                     # DW_AT_abstract_origin
+  .byte 7                       # DW_AT_low_pc
+  .long .Ltmp43-.Ltmp41         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 50                      # DW_AT_call_line
+  .byte 6                       # Abbrev [6] 0x192:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc11-.debug_loc.dwo # DW_AT_location
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0x19b:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0x1a3:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 19                      # Abbrev [19] 0x1a9:0x23 DW_TAG_inlined_subroutine
+  .long 113                     # DW_AT_abstract_origin
+  .byte 8                       # DW_AT_low_pc
+  .long .Ltmp47-.Ltmp45         # DW_AT_high_pc
+  .byte 1                       # DW_AT_call_file
+  .byte 53                      # DW_AT_call_line
+  .byte 6                       # Abbrev [6] 0x1b5:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc12-.debug_loc.dwo # DW_AT_location
+  .long 123                     # DW_AT_abstract_origin
+  .byte 7                       # Abbrev [7] 0x1be:0x8 DW_TAG_variable
+  .byte 2                       # DW_AT_location
+  .byte 145
+  .byte 0
+  .long 131                     # DW_AT_abstract_origin
+  .byte 8                       # Abbrev [8] 0x1c6:0x5 DW_TAG_variable
+  .long 139                     # DW_AT_abstract_origin
+  .byte 0                       # End Of Children Mark
+  .byte 0                       # End Of Children Mark
+  .byte 20                      # Abbrev [20] 0x1cd:0x5 DW_TAG_pointer_type
+  .long 148                     # DW_AT_type
+  .byte 20                      # Abbrev [20] 0x1d2:0x5 DW_TAG_pointer_type
+  .long 471                     # DW_AT_type
+  .byte 20                      # Abbrev [20] 0x1d7:0x5 DW_TAG_pointer_type
+  .long 476                     # DW_AT_type
+  .byte 12                      # Abbrev [12] 0x1dc:0x4 DW_TAG_base_type
+  .byte 13                      # DW_AT_name
+  .byte 6                       # DW_AT_encoding
+  .byte 1                       # DW_AT_byte_size
+  .byte 0                       # End Of Children Mark
+.Ldebug_info_dwo_end0:
+  .section  .debug_abbrev.dwo,"e",@progbits
+  .byte 1                       # Abbreviation Code
+  .byte 17                      # DW_TAG_compile_unit
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 37                      # DW_AT_producer
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 19                      # DW_AT_language
+  .byte 5                       # DW_FORM_data2
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .ascii  "\260B"                 # DW_AT_GNU_dwo_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .ascii  "\261B"                 # DW_AT_GNU_dwo_id
+  .byte 7                       # DW_FORM_data8
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 2                       # Abbreviation Code
+  .byte 46                      # DW_TAG_subprogram
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 17                      # DW_AT_low_pc
+  .ascii  "\201>"                 # DW_FORM_GNU_addr_index
+  .byte 18                      # DW_AT_high_pc
+  .byte 6                       # DW_FORM_data4
+  .byte 64                      # DW_AT_frame_base
+  .byte 24                      # DW_FORM_exprloc
+  .byte 110                     # DW_AT_linkage_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 58                      # DW_AT_decl_file
+  .byte 11                      # DW_FORM_data1
+  .byte 59                      # DW_AT_decl_line
+  .byte 11                      # DW_FORM_data1
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 63                      # DW_AT_external
+  .byte 25                      # DW_FORM_flag_present
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 3                       # Abbreviation Code
+  .byte 5                       # DW_TAG_formal_parameter
+  .byte 0                       # DW_CHILDREN_no
+  .byte 2                       # DW_AT_location
+  .byte 23                      # DW_FORM_sec_offset
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 58                      # DW_AT_decl_file
+  .byte 11                      # DW_FORM_data1
+  .byte 59                      # DW_AT_decl_line
+  .byte 11                      # DW_FORM_data1
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 4                       # Abbreviation Code
+  .byte 52                      # DW_TAG_variable
+  .byte 0                       # DW_CHILDREN_no
+  .byte 2                       # DW_AT_location
+  .byte 23                      # DW_FORM_sec_offset
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 58                      # DW_AT_decl_file
+  .byte 11                      # DW_FORM_data1
+  .byte 59                      # DW_AT_decl_line
+  .byte 11                      # DW_FORM_data1
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 5                       # Abbreviation Code
+  .byte 46                      # DW_TAG_subprogram
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 17                      # DW_AT_low_pc
+  .ascii  "\201>"                 # DW_FORM_GNU_addr_index
+  .byte 18                      # DW_AT_high_pc
+  .byte 6                       # DW_FORM_data4
+  .byte 64                      # DW_AT_frame_base
+  .byte 24                      # DW_FORM_exprloc
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 6                       # Abbreviation Code
+  .byte 5                       # DW_TAG_formal_parameter
+  .byte 0                       # DW_CHILDREN_no
+  .byte 2                       # DW_AT_location
+  .byte 23                      # DW_FORM_sec_offset
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 7                       # Abbreviation Code
+  .byte 52                      # DW_TAG_variable
+  .byte 0                       # DW_CHILDREN_no
+  .byte 2                       # DW_AT_location
+  .byte 24                      # DW_FORM_exprloc
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 8                       # Abbreviation Code
+  .byte 52                      # DW_TAG_variable
+  .byte 0                       # DW_CHILDREN_no
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 9                       # Abbreviation Code
+  .byte 46                      # DW_TAG_subprogram
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 110                     # DW_AT_linkage_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 58                      # DW_AT_decl_file
+  .byte 11                      # DW_FORM_data1
+  .byte 59                      # DW_AT_decl_line
+  .byte 11                      # DW_FORM_data1
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 63                      # DW_AT_external
+  .byte 25                      # DW_FORM_flag_present
+  .byte 32                      # DW_AT_inline
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 10                      # Abbreviation Code
+  .byte 5                       # DW_TAG_formal_parameter
+  .byte 0                       # DW_CHILDREN_no
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 58                      # DW_AT_decl_file
+  .byte 11                      # DW_FORM_data1
+  .byte 59                      # DW_AT_decl_line
+  .byte 11                      # DW_FORM_data1
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 11                      # Abbreviation Code
+  .byte 52                      # DW_TAG_variable
+  .byte 0                       # DW_CHILDREN_no
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 58                      # DW_AT_decl_file
+  .byte 11                      # DW_FORM_data1
+  .byte 59                      # DW_AT_decl_line
+  .byte 11                      # DW_FORM_data1
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 12                      # Abbreviation Code
+  .byte 36                      # DW_TAG_base_type
+  .byte 0                       # DW_CHILDREN_no
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 62                      # DW_AT_encoding
+  .byte 11                      # DW_FORM_data1
+  .byte 11                      # DW_AT_byte_size
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 13                      # Abbreviation Code
+  .byte 1                       # DW_TAG_array_type
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 14                      # Abbreviation Code
+  .byte 33                      # DW_TAG_subrange_type
+  .byte 0                       # DW_CHILDREN_no
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 55                      # DW_AT_count
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 15                      # Abbreviation Code
+  .byte 36                      # DW_TAG_base_type
+  .byte 0                       # DW_CHILDREN_no
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 11                      # DW_AT_byte_size
+  .byte 11                      # DW_FORM_data1
+  .byte 62                      # DW_AT_encoding
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 16                      # Abbreviation Code
+  .byte 46                      # DW_TAG_subprogram
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 17                      # DW_AT_low_pc
+  .ascii  "\201>"                 # DW_FORM_GNU_addr_index
+  .byte 18                      # DW_AT_high_pc
+  .byte 6                       # DW_FORM_data4
+  .byte 64                      # DW_AT_frame_base
+  .byte 24                      # DW_FORM_exprloc
+  .byte 3                       # DW_AT_name
+  .ascii  "\202>"                 # DW_FORM_GNU_str_index
+  .byte 58                      # DW_AT_decl_file
+  .byte 11                      # DW_FORM_data1
+  .byte 59                      # DW_AT_decl_line
+  .byte 11                      # DW_FORM_data1
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 63                      # DW_AT_external
+  .byte 25                      # DW_FORM_flag_present
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 17                      # Abbreviation Code
+  .byte 29                      # DW_TAG_inlined_subroutine
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 85                      # DW_AT_ranges
+  .byte 23                      # DW_FORM_sec_offset
+  .byte 88                      # DW_AT_call_file
+  .byte 11                      # DW_FORM_data1
+  .byte 89                      # DW_AT_call_line
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 18                      # Abbreviation Code
+  .byte 5                       # DW_TAG_formal_parameter
+  .byte 0                       # DW_CHILDREN_no
+  .byte 28                      # DW_AT_const_value
+  .byte 13                      # DW_FORM_sdata
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 19                      # Abbreviation Code
+  .byte 29                      # DW_TAG_inlined_subroutine
+  .byte 1                       # DW_CHILDREN_yes
+  .byte 49                      # DW_AT_abstract_origin
+  .byte 19                      # DW_FORM_ref4
+  .byte 17                      # DW_AT_low_pc
+  .ascii  "\201>"                 # DW_FORM_GNU_addr_index
+  .byte 18                      # DW_AT_high_pc
+  .byte 6                       # DW_FORM_data4
+  .byte 88                      # DW_AT_call_file
+  .byte 11                      # DW_FORM_data1
+  .byte 89                      # DW_AT_call_line
+  .byte 11                      # DW_FORM_data1
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 20                      # Abbreviation Code
+  .byte 15                      # DW_TAG_pointer_type
+  .byte 0                       # DW_CHILDREN_no
+  .byte 73                      # DW_AT_type
+  .byte 19                      # DW_FORM_ref4
+  .byte 0                       # EOM(1)
+  .byte 0                       # EOM(2)
+  .byte 0                       # EOM(3)
+  .section  .debug_addr,"",@progbits
+.Laddr_table_base0:
+  .quad .Lfunc_begin0
+  .quad .Lfunc_begin1
+  .quad .Lfunc_begin2
+  .quad .Ltmp21
+  .quad .Ltmp26
+  .quad .Ltmp31
+  .quad .Ltmp36
+  .quad .Ltmp41
+  .quad .Ltmp45
+  .quad .Ltmp3
+  .quad .Ltmp5
+  .quad .Ltmp18
+  .quad .Ltmp23
+  .quad .Ltmp28
+  .quad .Ltmp33
+  .quad .Ltmp38
+  .quad .Ltmp43
+  .quad .Ltmp47
+  .section  .debug_gnu_pubnames,"",@progbits
+  .long .LpubNames_end0-.LpubNames_begin0 # Length of Public Names Info
+.LpubNames_begin0:
+  .short  2                       # DWARF Version
+  .long .Lcu_begin0             # Offset of Compilation Unit Info
+  .long 201                     # Compilation Unit Length
+  .long 113                     # DIE offset
+  .byte 48                      # Attributes: FUNCTION, EXTERNAL
+  .asciz  "fib"                   # External Name
+  .long 25                      # DIE offset
+  .byte 48                      # Attributes: FUNCTION, EXTERNAL
+  .asciz  "real_fib"              # External Name
+  .long 168                     # DIE offset
+  .byte 48                      # Attributes: FUNCTION, EXTERNAL
+  .asciz  "main"                  # External Name
+  .long 0                       # End Mark
+.LpubNames_end0:
+  .section  .debug_gnu_pubtypes,"",@progbits
+  .long .LpubTypes_end0-.LpubTypes_begin0 # Length of Public Types Info
+.LpubTypes_begin0:
+  .short  2                       # DWARF Version
+  .long .Lcu_begin0             # Offset of Compilation Unit Info
+  .long 201                     # Compilation Unit Length
+  .long 148                     # DIE offset
+  .byte 144                     # Attributes: TYPE, STATIC
+  .asciz  "int"                   # External Name
+  .long 476                     # DIE offset
+  .byte 144                     # Attributes: TYPE, STATIC
+  .asciz  "char"                  # External Name
+  .long 0                       # End Mark
+.LpubTypes_end0:
+
+  .ident  "clang version 9.0.0 (trunk 358316)"
+  .section  ".note.GNU-stack","",@progbits
+  .addrsig
+  .section  .debug_line,"",@progbits
+.Lline_table_start0:

test/tools/llvm-dwarfdump/X86/statistics-dwo.test

+# Test of the llmv-dwarfdump --statistics with split dwarf (dwo files)
+# (version 3).
+#
+# Create a directory in which to put all files, so .o file can find .dwo file.
+RUN: rm -rf %t && mkdir -p %t
+RUN: cp -f %S/Inputs/statistics-fib.split-dwarf.s %t/.
+RUN: cd %t
+RUN: llvm-mc -triple x86_64-unknown-linux-gnu statistics-fib.split-dwarf.s -filetype=obj -split-dwarf-file statistics-fib.split-dwarf.dwo -o statistics-fib.split-dwarf.o
+RUN: llvm-dwarfdump --statistics statistics-fib.split-dwarf.o | FileCheck %s
+
+# Source program - A version of Fibonacci
+# Compilation options:  -gsplit-dwarf -O3 -c -S
+#
+# int
+# real_fib (int x, int answers[11])
+# {
+#   int result;
+# 
+#   if ((answers)[x] != -1)
+#     return (answers)[x];
+# 
+#   result = real_fib(x-1, answers) + real_fib(x-2, answers);
+#   (answers)[x] = result;
+# 
+#   return result;
+# }
+# 
+# int
+# fib (int x)
+# {
+#   int answers[11];
+#   int i;
+# 
+#   if (x > 10)
+#     return -1;
+# 
+#   for (i = 0; i < 11; i++)
+#     answers[i] = -1;
+# 
+#   answers[0] = 0;
+#   answers[1] = 1;
+#   answers[2] = 1;
+# 
+#   return real_fib(x, answers);
+# }
+# 
+# int main (int argc, char **argv)
+# {
+#   int result;
+# 
+#   result = fib(3);
+#   printf ("fibonacci(3) = %d\n", result);
+#   result = fib(4);
+#   printf ("fibonacci(4) = %d\n", result);
+#   result = fib(5);
+#   printf ("fibonacci(5) = %d\n", result);
+#   result = fib(6);
+#   printf ("fibonacci(6) = %d\n", result);
+#   result = fib(7);
+#   printf ("fibonacci(7) = %d\n", result);
+#   result = fib(8);
+#   printf ("fibonacci(8) = %d\n", result);
+#   result = fib(9);
+#   printf ("fibonacci(9) = %d\n", result);
+#   result = fib(10);
+#   printf ("fibonacci(10) = %d\n", result);
+# 
+#   return 0;
+# }
+#
+
+CHECK: "version":3
+CHECK: "source functions":3
+CHECK: "source functions with location":3
+CHECK: "inlined functions":7
+CHECK: "inlined funcs with abstract origins":7
+CHECK: "unique source variables":9
+CHECK: "source variables":30
+
+# Ideally the value below would be 33 but currently it's not.
+CHECK: "variables with location":22
+CHECK: "call site entries":7
+CHECK: "scope bytes total":2817
+CHECK: "scope bytes covered":506
+CHECK: "total function size":594
+CHECK: "total inlined function size":345
+CHECK: "total formal params":12
+CHECK: "formal params with source location":12
+CHECK: "formal params with type":12
+CHECK: "formal params with binary location":12
+CHECK: "total vars":18
+CHECK: "vars with source location":18
+CHECK: "vars with type":18
+
+# Ideally the value below would be 18, but currently it's not.
+CHECK: "vars with binary location":10

tools/llvm-dwarfdump/Statistics.cpp

 /// useful, only the delta between compiling the same program with different
 /// compilers is.
 bool collectStatsForObjectFile(ObjectFile &Obj, DWARFContext &DICtx,
                                Twine Filename, raw_ostream &OS) {
   StringRef FormatName = Obj.getFileFormatName();
   GlobalStats GlobalStats;
   StringMap<PerFunctionStats> Statistics;
   for (const auto &CU : static_cast<DWARFContext *>(&DICtx)->compile_units())
-    if (DWARFDie CUDie = CU->getUnitDIE(false))
+    if (DWARFDie CUDie = CU->getNonSkeletonUnitDIE(false))
       collectStatsRecursive(CUDie, "/", "g", 0, 0, 0, Statistics, GlobalStats);
 
   /// The version number should be increased every time the algorithm is changed
   /// (including bug fixes). New metrics may be added without increasing the
   /// version.
   unsigned Version = 3;
   unsigned VarParamTotal = 0;
   unsigned VarParamUnique = 0;