test/DebugInfo/MIR/AArch64/dbgcall-site-expr-chain.mir

# RUN: llc -mtriple aarch64-linux-gnu -emit-call-site-info -debug-entry-values -start-after=livedebugvalues -filetype=obj -o - %s \
# RUN:     | llvm-dwarfdump - | FileCheck %s --implicit-check-not=DW_TAG_GNU_call_site_parameter
#
# Based on the following C reproducer:
#
#   extern void call(long, long, long);
#   extern long global;
#
#   long foo() {
#     long local = global;
#     call(local + 123, local - 456, local + 789);
#     return local;
#   }

--- |
  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64"

  @global = external dso_local local_unnamed_addr global i64, align 8

  define dso_local i64 @foo() local_unnamed_addr !dbg !12 {
  entry:
    %0 = load i64, i64* @global, align 8, !dbg !17
    call void @llvm.dbg.value(metadata i64 %0, metadata !16, metadata !DIExpression()), !dbg !17
    %add = add nsw i64 %0, 123, !dbg !17
    %sub = add nsw i64 %0, -456, !dbg !17
    %add1 = add nsw i64 %0, 789, !dbg !17
    call void @call(i64 %add, i64 %sub, i64 %add1), !dbg !17
    ret i64 %0, !dbg !17
  }

  declare !dbg !4 dso_local void @call(i64, i64, i64) local_unnamed_addr

  declare void @llvm.dbg.value(metadata, metadata, metadata)

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!8, !9, !10}
  !llvm.ident = !{!11}

  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "dbgcall-site-expr-chain.c", directory: "/")
  !2 = !{}
  !3 = !{!4}
  !4 = !DISubprogram(name: "call", scope: !1, file: !1, line: 1, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
  !5 = !DISubroutineType(types: !6)
  !6 = !{null, !7, !7, !7}
  !7 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
  !8 = !{i32 7, !"Dwarf Version", i32 4}
  !9 = !{i32 2, !"Debug Info Version", i32 3}
  !10 = !{i32 1, !"wchar_size", i32 4}
  !11 = !{!"clang version 11.0.0 "}
  !12 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 5, type: !13, scopeLine: 5, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !15)
  !13 = !DISubroutineType(types: !14)
  !14 = !{!7}
  !15 = !{!16}
  !16 = !DILocalVariable(name: "local", scope: !12, file: !1, line: 6, type: !7)
  !17 = !DILocation(line: 6, scope: !12)

...
---
name:            foo
tracksRegLiveness: true
stack:
  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$x19' }
  - { id: 1, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$lr' }
  - { id: 2, type: spill-slot, offset: -32, size: 8, alignment: 8, callee-saved-register: '$fp' }
callSites:
  - { bb: 0, offset: 17, fwdArgRegs:
      - { arg: 0, reg: '$x0' }
      - { arg: 1, reg: '$x1' }
      - { arg: 2, reg: '$x2' } }
body:             |
  bb.0.entry:
    liveins: $lr, $x19

    early-clobber $sp = frame-setup STPXpre $fp, killed $lr, $sp, -4 :: (store 8 into %stack.2), (store 8 into %stack.1)
    frame-setup STRXui killed $x19, $sp, 2 :: (store 8 into %stack.0)
    $fp = frame-setup ADDXri $sp, 0, 0
    frame-setup CFI_INSTRUCTION def_cfa $w29, 32
    frame-setup CFI_INSTRUCTION offset $w19, -16, debug-location !17
    frame-setup CFI_INSTRUCTION offset $w30, -24, debug-location !17
    frame-setup CFI_INSTRUCTION offset $w29, -32, debug-location !17
    renamable $x8 = ADRP target-flags(aarch64-page) @global, debug-location !17
    renamable $x19 = LDRXui killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) @global, debug-location !17 :: (dereferenceable load 8 from @global)
    DBG_VALUE $x19, $noreg, !16, !DIExpression(), debug-location !17
    renamable $x0 = nsw ADDXri renamable $x19, 100, 0, debug-location !17
    renamable $x8 = nsw SUBXri renamable $x19, 406, 0, debug-location !17
    renamable $x0 = nsw ADDXri renamable $x0, 23, 0, debug-location !17
    renamable $x1 = nsw SUBXri renamable $x8, 50, 0, debug-location !17
    renamable $x2 = nsw ADDXri renamable $x19, 700, 0, debug-location !17
    renamable $x2 = nsw ADDXri renamable $x2, 9, 0, debug-location !17
    renamable $x2 = nsw ADDXri renamable $x2, 80, 0, debug-location !17
    BL @call, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $x0, implicit killed $x1, implicit killed $x2, implicit-def $sp, debug-location !17
    $x0 = ORRXrs $xzr, killed $x19, 0, debug-location !17
    $x19 = frame-destroy LDRXui $sp, 2, debug-location !17 :: (load 8 from %stack.0)
    early-clobber $sp, $fp, $lr = frame-destroy LDPXpost $sp, 4, debug-location !17 :: (load 8 from %stack.2), (load 8 from %stack.1)
    RET undef $lr, implicit killed $x0, debug-location !17

...

# Verify that call site entries are emitted for all three parameters.
#
# The MIR has been hand-modified to build up the call site values using chains
# of ADDXri/SUBXri instructions instead of a single instruction per parameter.

# CHECK: DW_TAG_GNU_call_site_parameter
# CHECK-NEXT: DW_AT_location (DW_OP_reg2 W2)
# CHECK-NEXT: DW_AT_GNU_call_site_value (DW_OP_breg19 W19+700, DW_OP_plus_uconst 0x9, DW_OP_plus_uconst 0x50)

# CHECK: DW_TAG_GNU_call_site_parameter
# CHECK-NEXT: DW_AT_location (DW_OP_reg1 W1)
# CHECK-NEXT: DW_AT_GNU_call_site_value (DW_OP_breg19 W19-406, DW_OP_constu 0x32, DW_OP_minus)

# CHECK: DW_TAG_GNU_call_site_parameter
# CHECK-NEXT: DW_AT_location (DW_OP_reg0 W0)
# CHECK-NEXT: DW_AT_GNU_call_site_value (DW_OP_breg19 W19+100, DW_OP_plus_uconst 0x17)