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

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

## Check the memory location of the target address for the indirect call
## (virtual in this case) is described by a DW_AT_call_target_clobbered
## expression.

# CHECK: DW_TAG_call_site
# CHECK-NEXT: DW_AT_call_target_clobbered (DW_OP_breg0 RAX+8)

## Generated from this C++ with llc -stop-after=livedebugvalues -simplify-mir:
## struct Base {
##   virtual int zz() { return x; }
##   [[clang::noinline]]
##   virtual int v() { return zz(); }
##   int x;
## };
## struct Child: public Base {
##   [[clang::noinline]]
##   virtual int v() { return x * 2; }
##   int x;
## };
##
## [[clang::noinline]]
## [[clang::disable_tail_calls]]
## int foo(Base* b) {
##   return b->v();
## }

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

  define dso_local noundef i32 @_Z3fooP4Base(ptr noundef %b) local_unnamed_addr !dbg !5 {
  entry:
    %vtable = load ptr, ptr %b, align 8, !dbg !12
    %vfn = getelementptr inbounds nuw i8, ptr %vtable, i64 8, !dbg !12
    %0 = load ptr, ptr %vfn, align 8, !dbg !12
    %call = call noundef i32 %0(ptr noundef nonnull align 8 dereferenceable(12) %b), !dbg !12
    ret i32 %call, !dbg !12
  }

  !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: "foo", linkageName: "_Z3fooP4Base", scope: !1, file: !1, line: 15, type: !6, scopeLine: 15, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11, keyInstructions: true)
  !6 = !DISubroutineType(types: !7)
  !7 = !{!8, !9}
  !8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
  !10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Base", file: !1, line: 1, size: 128, flags: DIFlagFwdDecl | DIFlagNonTrivial, identifier: "_ZTS4Base")
  !11 = !{}
  !12 = !DILocation(line: 16, scope: !5)
...
---
name:            _Z3fooP4Base
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
  isCalleeSavedInfoValid: true
machineFunctionInfo:
  amxProgModel:    None
body:             |
  bb.0.entry:
    liveins: $rdi

    frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
    frame-setup CFI_INSTRUCTION def_cfa_offset 16
    renamable $rax = MOV64rm renamable $rdi, 1, $noreg, 0, $noreg, debug-location !12 :: (load (s64) from %ir.b)
    CALL64m killed renamable $rax, 1, $noreg, 8, $noreg, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !12 :: (load (s64) from %ir.vfn)
    $rcx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !12
    frame-destroy CFI_INSTRUCTION def_cfa_offset 8, debug-location !12
    RET64 $eax, debug-location !12
...