llvm/test/DebugInfo/X86/DW_AT_location-reference.ll

; RUN: llc -O1 -filetype=obj -mtriple=x86_64-apple-darwin < %s > %t
; RUN: llvm-dwarfdump %t  | FileCheck %s
; RUN: llvm-objdump -r %t | FileCheck -check-prefix=DARWIN %s
; RUN: llc -O1 -filetype=obj -mtriple=x86_64-pc-linux-gnu < %s > %t
; RUN: llvm-dwarfdump %t  | FileCheck %s
; RUN: llvm-objdump -r %t | FileCheck -check-prefix=LINUX %s

; PR9493
; Adapted from the original test case in r127757.
; We use 'llc -O1' to induce variable 'x' to live in different locations.
; We don't actually care where 'x' lives, or what exact optimizations get
; used, as long as 'x' moves around we're fine.

; // The variable 'x' lives in different locations, so it needs an entry in
; // the .debug_loc table section, referenced by DW_AT_location.
; // This ref is not relocatable on Darwin, and is relocatable elsewhere.
; extern int g(int, int);
; extern int a;
; 
; void f(void) {
;   int x;
;   a = g(0, 0);
;   x = 1;
;   while (x & 1) { x *= a; }
;   a = g(x, 0);
;   x = 2;
;   while (x & 2) { x *= a; }
;   a = g(0, x);
; }

; // The 'x' variable and its symbol reference location
; CHECK: .debug_info contents:
; CHECK:      DW_TAG_variable
; CHECK-NEXT:   DW_AT_name {{.*}} "x"
; CHECK-NEXT:   DW_AT_decl_file
; CHECK-NEXT:   DW_AT_decl_line
; CHECK-NEXT:   DW_AT_type
; CHECK-NEXT:   DW_AT_location [DW_FORM_sec_offset] (0x00000000)

; Check that the location contains only 4 ranges - this verifies that the 4th
; and 5th ranges were successfully merged into a single range.
; CHECK: .debug_loc contents:
; CHECK: 0x00000000:
; CHECK: Beginning address offset:
; CHECK: Beginning address offset:
; CHECK: Beginning address offset:
; CHECK: Beginning address offset:
; CHECK-NOT: Beginning address offset:

; Check that we have no relocations in Darwin's output.
; DARWIN-NOT: X86_64_RELOC{{.*}} __debug_loc

; Check we have a relocation for the debug_loc entry in Linux output.
; LINUX: RELOCATION RECORDS FOR [.rela.debug_info]
; LINUX-NOT: RELOCATION RECORDS
; LINUX: R_X86_64{{.*}} .debug_loc+0

; ModuleID = 'simple.c'
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n32"

@a = external global i32

define void @f() nounwind {
entry:
  %call = tail call i32 @g(i32 0, i32 0) nounwind, !dbg !8
  store i32 %call, i32* @a, align 4, !dbg !8
  tail call void @llvm.dbg.value(metadata !12, i64 0, metadata !5), !dbg !13
  br label %while.body

while.body:                                       ; preds = %entry, %while.body
  %x.017 = phi i32 [ 1, %entry ], [ %mul, %while.body ]
  %mul = mul nsw i32 %call, %x.017, !dbg !14
  %and = and i32 %mul, 1, !dbg !14
  %tobool = icmp eq i32 %and, 0, !dbg !14
  br i1 %tobool, label %while.end, label %while.body, !dbg !14

while.end:                                        ; preds = %while.body
  tail call void @llvm.dbg.value(metadata !{i32 %mul}, i64 0, metadata !5), !dbg !14
  %call4 = tail call i32 @g(i32 %mul, i32 0) nounwind, !dbg !15
  store i32 %call4, i32* @a, align 4, !dbg !15
  tail call void @llvm.dbg.value(metadata !16, i64 0, metadata !5), !dbg !17
  br label %while.body9

while.body9:                                      ; preds = %while.end, %while.body9
  %x.116 = phi i32 [ 2, %while.end ], [ %mul12, %while.body9 ]
  %mul12 = mul nsw i32 %call4, %x.116, !dbg !18
  %and7 = and i32 %mul12, 2, !dbg !18
  %tobool8 = icmp eq i32 %and7, 0, !dbg !18
  br i1 %tobool8, label %while.end13, label %while.body9, !dbg !18

while.end13:                                      ; preds = %while.body9
  tail call void @llvm.dbg.value(metadata !{i32 %mul12}, i64 0, metadata !5), !dbg !18
  %call15 = tail call i32 @g(i32 0, i32 %mul12) nounwind, !dbg !19
  store i32 %call15, i32* @a, align 4, !dbg !19
  ret void, !dbg !20
}

declare i32 @g(i32, i32)

declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!24}

!0 = metadata !{i32 786478, metadata !23, metadata !1, metadata !"f", metadata !"f", metadata !"", i32 4, metadata !3, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void ()* @f, null, null, metadata !22, i32 4} ; [ DW_TAG_subprogram ] [line 4] [def] [f]
!1 = metadata !{i32 786473, metadata !23} ; [ DW_TAG_file_type ]
!2 = metadata !{i32 786449, metadata !23, i32 12, metadata !"clang version 3.0 (trunk)", i1 true, metadata !"", i32 0, metadata !4, metadata !4, metadata !21, null,  null, null} ; [ DW_TAG_compile_unit ]
!3 = metadata !{i32 786453, metadata !23, metadata !1, metadata !"", i32 0, i64 0, i64 0, i32 0, i32 0, null, metadata !4, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!4 = metadata !{null}
!5 = metadata !{i32 786688, metadata !6, metadata !"x", metadata !1, i32 5, metadata !7, i32 0, null} ; [ DW_TAG_auto_variable ]
!6 = metadata !{i32 786443, metadata !23, metadata !0, i32 4, i32 14, i32 0} ; [ DW_TAG_lexical_block ]
!7 = metadata !{i32 786468, null, metadata !2, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
!8 = metadata !{i32 6, i32 3, metadata !6, null}
!12 = metadata !{i32 1}
!13 = metadata !{i32 7, i32 3, metadata !6, null}
!14 = metadata !{i32 8, i32 3, metadata !6, null}
!15 = metadata !{i32 9, i32 3, metadata !6, null}
!16 = metadata !{i32 2}
!17 = metadata !{i32 10, i32 3, metadata !6, null}
!18 = metadata !{i32 11, i32 3, metadata !6, null}
!19 = metadata !{i32 12, i32 3, metadata !6, null}
!20 = metadata !{i32 13, i32 1, metadata !6, null}
!21 = metadata !{metadata !0}
!22 = metadata !{metadata !5}
!23 = metadata !{metadata !"simple.c", metadata !"/home/rengol01/temp/tests/dwarf/relocation"}
!24 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}