TheRock/compiler/amd-llvm/llvm/test/DebugInfo/X86/dwarf-call-target-clobbered.mir

# RUN: llc %s --start-after=livedebugvalues -o - --filetype=obj | llvm-dwarfdump -  | FileCheck %s

## Check that DW_AT_call_target_clobbered is used for a location expression
## using a volatile register, otherwise DW_AT_call_target is used.

## Generated from this C++ with llc -stop-after=livedebugvalues -simplify-mir:
## __attribute__((disable_tail_calls)) void call_mem(void (**f)()) {
##   (*f)();
##   (*f)();
## }

## Which disassembles to -
## 0000000000000000 <_Z8call_memPPFvvE>:
##        0: 53                            pushq   %rbx
##        1: 48 89 fb                      movq    %rdi, %rbx
##        4: ff 17                         callq   *(%rdi)
##        6: ff 13                         callq   *(%rbx)
##        8: 5b                            popq    %rbx
##        9: c3                            retq

# CHECK: DW_TAG_call_site
# CHECK-NEXT: DW_AT_call_target_clobbered (DW_OP_breg5 RDI+0)
# CHECK: DW_TAG_call_site
# CHECK-NEXT: DW_AT_call_target (DW_OP_breg3 RBX+0)

--- |
  target triple = "x86_64-unknown-linux-gnu"

  define dso_local void @_Z8call_memPPFvvE(ptr noundef readonly captures(none) %f) local_unnamed_addr !dbg !5 {
  entry:
    %0 = load ptr, ptr %f, align 8, !dbg !13
    call void %0(), !dbg !13
    %1 = load ptr, ptr %f, align 8, !dbg !14
    call void %1(), !dbg !14
    ret void
  }

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!2, !3}
  !llvm.ident = !{!4}

  !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 22.0.0git", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "test.cpp", directory: "/")
  !2 = !{i32 7, !"Dwarf Version", i32 5}
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = !{!"clang version 22.0.0git"}
  !5 = distinct !DISubprogram(name: "call_mem", linkageName: "_Z8call_memPPFvvE", scope: !1, file: !1, line: 1, type: !6, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
  !6 = !DISubroutineType(types: !7)
  !7 = !{null, !8}
  !8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
  !9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
  !10 = !DISubroutineType(types: !11)
  !11 = !{null}
  !12 = !{}
  !13 = !DILocation(line: 2, scope: !5)
  !14 = !DILocation(line: 3, scope: !5)
...
---
name:            _Z8call_memPPFvvE
alignment:       16
tracksRegLiveness: true
noPhis:          true
isSSA:           false
noVRegs:         true
hasFakeUses:     false
debugInstrRef:   true
tracksDebugUserValues: true
liveins:
  - { reg: '$rdi' }
frameInfo:
  stackSize:       8
  offsetAdjustment: -8
  maxAlignment:    1
  adjustsStack:    true
  hasCalls:        true
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 8
  isCalleeSavedInfoValid: true
fixedStack:
  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$rbx' }
machineFunctionInfo:
  amxProgModel:    None
body:             |
  bb.0.entry:
    liveins: $rdi, $rbx

    frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
    frame-setup CFI_INSTRUCTION def_cfa_offset 16
    CFI_INSTRUCTION offset $rbx, -16
    $rbx = MOV64rr $rdi
    CALL64m $rdi, 1, $noreg, 0, $noreg, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, debug-location !13 :: (load (s64) from %ir.f)
    CALL64m killed renamable $rbx, 1, $noreg, 0, $noreg, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, debug-location !14 :: (load (s64) from %ir.f)
    $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp
    frame-destroy CFI_INSTRUCTION def_cfa_offset 8
    RET64
...