# RUN: llc -debug-entry-values -run-pass=livedebugvalues -o - %s | FileCheck %s

# Based on the following C reproducer:
#
# extern void ext(int *);
# extern int interesting(int *);
# extern int *value(void);
#
# static void callee(int *p1, int *p2) {
#   if (interesting(p2))
#     for (;;)
#       ext(p1);
#   ext(p2);
# }
#
# void caller() {
#   int *local = value();
#   callee(local, (int *)0xabcd);
# }
#
# Generated using:
#
# clang -Os -fno-inline -Xclang -femit-debug-entry-values -g --target=armeb.

--- |
  target datalayout = "E-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
  target triple = "armebv4t-unknown-unknown"

  ; Function Attrs: noinline nounwind optsize
  define arm_aapcs_vfpcc void @caller() #0 !dbg !20 {
  entry:
    unreachable
  }

  ; Function Attrs: noinline nounwind optsize
  define internal arm_aapcs_vfpcc void @callee(i32* %p1) unnamed_addr #0 !dbg !29 {
  entry:
    unreachable
  }

  declare !dbg !4 arm_aapcs_vfpcc i32* @value()
  declare !dbg !9 arm_aapcs_vfpcc i32 @interesting(i32*)
  declare !dbg !12 arm_aapcs_vfpcc void @ext(i32*)

  ; Function Attrs: nounwind readnone speculatable willreturn
  declare void @llvm.dbg.value(metadata, metadata, metadata) #1

  attributes #0 = { noinline nounwind optsize "frame-pointer"="all" }
  attributes #1 = { nounwind readnone speculatable willreturn }

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!15, !16, !17, !18}
  !llvm.ident = !{!19}

  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)
  !1 = !DIFile(filename: "armeb.c", directory: "/")
  !2 = !{}
  !3 = !{!4, !7, !9, !12}
  !4 = !DISubprogram(name: "value", scope: !1, file: !1, line: 3, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
  !5 = !DISubroutineType(types: !6)
  !6 = !{!7}
  !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 32)
  !8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !9 = !DISubprogram(name: "interesting", scope: !1, file: !1, line: 2, type: !10, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
  !10 = !DISubroutineType(types: !11)
  !11 = !{!8, !7}
  !12 = !DISubprogram(name: "ext", scope: !1, file: !1, line: 1, type: !13, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
  !13 = !DISubroutineType(types: !14)
  !14 = !{null, !7}
  !15 = !{i32 2, !"Dwarf Version", i32 4}
  !16 = !{i32 2, !"Debug Info Version", i32 3}
  !17 = !{i32 1, !"wchar_size", i32 4}
  !18 = !{i32 1, !"min_enum_size", i32 4}
  !19 = !{!"clang version 10.0.0"}
  !20 = distinct !DISubprogram(name: "caller", scope: !1, file: !1, line: 12, type: !21, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !23)
  !21 = !DISubroutineType(types: !22)
  !22 = !{null}
  !23 = !{!24}
  !24 = !DILocalVariable(name: "local", scope: !20, file: !1, line: 13, type: !7)
  !25 = !DILocation(line: 13, scope: !20)
  !26 = !DILocation(line: 0, scope: !20)
  !27 = !DILocation(line: 14, scope: !20)
  !28 = !DILocation(line: 15, scope: !20)
  !29 = distinct !DISubprogram(name: "callee", scope: !1, file: !1, line: 5, type: !30, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !32)
  !30 = !DISubroutineType(types: !31)
  !31 = !{null, !7, !7}
  !32 = !{!33, !34}
  !33 = !DILocalVariable(name: "p1", arg: 1, scope: !29, file: !1, line: 5, type: !7)
  !34 = !DILocalVariable(name: "p2", arg: 2, scope: !29, file: !1, line: 5, type: !7)
  !35 = !DILocation(line: 0, scope: !29)
  !36 = !DILocation(line: 6, scope: !37)
  !37 = distinct !DILexicalBlock(scope: !29, file: !1, line: 6)
  !38 = !DILocation(line: 6, scope: !29)
  !39 = !DILocation(line: 7, scope: !40)
  !40 = distinct !DILexicalBlock(scope: !37, file: !1, line: 7)
  !41 = !DILocation(line: 8, scope: !42)
  !42 = distinct !DILexicalBlock(scope: !40, file: !1, line: 7)
  !43 = !DILocation(line: 7, scope: !42)
  !44 = distinct !{!44, !39, !45}
  !45 = !DILocation(line: 8, scope: !40)
  !46 = !DILocation(line: 9, scope: !29)
  !47 = !DILocation(line: 10, scope: !29)

...
---
name:            caller
alignment:       4
tracksRegLiveness: true
callSites:
  - { bb: 0, offset: 6 }
  - { bb: 0, offset: 9, fwdArgRegs:
      - { arg: 0, reg: '$r0' } }
body:             |
  bb.0:
    liveins: $lr

    $sp = frame-setup STMDB_UPD $sp, 14, $noreg, $r11, killed $lr
    frame-setup CFI_INSTRUCTION def_cfa_offset 8
    frame-setup CFI_INSTRUCTION offset $lr, -4
    frame-setup CFI_INSTRUCTION offset $r11, -8
    $r11 = frame-setup MOVr $sp, 14, $noreg, $noreg
    frame-setup CFI_INSTRUCTION def_cfa_register $r11
    BL @value, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0, debug-location !25
    DBG_VALUE $r0, $noreg, !24, !DIExpression(), debug-location !26
    $sp = LDMIA_UPD $sp, 14, $noreg, def $r11, def $lr, debug-location !27
    TAILJMPd @callee, implicit $sp, implicit $sp, implicit killed $r0, debug-location !27

...
---
name:            callee
tracksRegLiveness: true
stack:
  - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '$r10', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
body:             |
  bb.0:
    successors: %bb.2(0x30000000), %bb.1(0x50000000)
    liveins: $r0, $r4, $r10, $lr

    DBG_VALUE $r0, $noreg, !33, !DIExpression(), debug-location !35
    $sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r10, $r11, killed $lr
    frame-setup CFI_INSTRUCTION def_cfa_offset 16
    frame-setup CFI_INSTRUCTION offset $lr, -4
    frame-setup CFI_INSTRUCTION offset $r11, -8
    frame-setup CFI_INSTRUCTION offset $r10, -12
    frame-setup CFI_INSTRUCTION offset $r4, -16
    $r11 = frame-setup ADDri $sp, 8, 14, $noreg, $noreg
    frame-setup CFI_INSTRUCTION def_cfa $r11, 8
    $r4 = MOVr killed $r0, 14, $noreg, $noreg
    DBG_VALUE $r4, $noreg, !33, !DIExpression(), debug-location !35
    $r0 = MOVi 205, 14, $noreg, $noreg
    $r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
    ; The MOVI and ORRri produce the second parameter's (!34) value which has
    ; been propagated from caller().
    DBG_VALUE $r0, $noreg, !34, !DIExpression(), debug-location !35
    BL @interesting, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def $r0, debug-location !36
    CMPri killed renamable $r0, 0, 14, $noreg, implicit-def $cpsr, debug-location !38
    Bcc %bb.2, 0, killed $cpsr, debug-location !38

  bb.1:
    liveins: $r4

    $r0 = MOVr $r4, 14, $noreg, $noreg, debug-location !41
    BL @ext, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, debug-location !41
    B %bb.1, debug-location !43

  bb.2:
    $r0 = MOVi 205, 14, $noreg, $noreg
    $r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg
    $sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r10, def $r11, def $lr, debug-location !46
    TAILJMPd @ext, implicit $sp, implicit $sp, implicit killed $r0, debug-location !46

...

# In this test case the second parameter's value has been propagated from the
# caller to the callee, so we should not emit any entry value DBG_VALUEs for
# that parameter. The second parameter reuses the first parameter's register
# ($r0), and previously we would incorrectly emit an entry value for the
# parameter using that register.

# CHECK-DAG: ![[P1:[0-9]+]] = !DILocalVariable(name: "p1", arg: 1
# CHECK-DAG: ![[P2:[0-9]+]] = !DILocalVariable(name: "p2", arg: 2

# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value

# CHECK: DBG_VALUE $r0, $noreg, ![[P1]], !DIExpression(DW_OP_LLVM_entry_value

# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value