# RUN: llc -O1 -start-after=livedebugvalues -o - %s | FileCheck %s
# Reproducer based on the following C file:
#
# int global1, global2, global3;
#
# extern void ext1(int);
# extern void ext2(int, int);
# extern void ext3(int, int, int);
#
# int test1() {
# int local[3] = {global1, 123, 456};
# ext2(local[0], local[1]);
# return local[1];
# }
#
# int test2() {
# int local[3] = {global1, global2, global3};
# ext3(local[0], local[1], local[2]);
# return local[0];
# }
#
# Compiled using -O1 -g.
--- |
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@global1 = common global i32 0, align 4
@global2 = common global i32 0, align 4
@global3 = common global i32 0, align 4
; Function Attrs: nounwind uwtable
define i32 @test1() #0 !dbg !8 {
entry:
%0 = load i32, ptr @global1, align 4, !dbg !16
call void @llvm.dbg.value(metadata i32 %0, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !16
call void @llvm.dbg.value(metadata i32 123, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !16
call void @llvm.dbg.value(metadata i32 456, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 32)), !dbg !16
tail call void @ext2(i32 %0, i32 123), !dbg !16
ret i32 123, !dbg !17
}
declare void @ext2(i32, i32)
; Function Attrs: nounwind uwtable
define i32 @test2() #0 !dbg !18 {
entry:
%0 = load i32, ptr @global1, align 4, !dbg !20
call void @llvm.dbg.value(metadata i32 %0, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !20
%1 = load i32, ptr @global2, align 4, !dbg !20
call void @llvm.dbg.value(metadata i32 %1, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !20
%2 = load i32, ptr @global3, align 4, !dbg !20
call void @llvm.dbg.value(metadata i32 %2, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 32)), !dbg !20
tail call void @ext3(i32 %0, i32 %1, i32 %2) #3, !dbg !20
ret i32 %0, !dbg !21
}
declare void @ext3(i32, i32, i32)
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!1}
!llvm.module.flags = !{!5, !6}
!llvm.ident = !{!7}
!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !3, nameTableKind: None)
!2 = !DIFile(filename: "foo.c", directory: "/")
!3 = !{}
!4 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!5 = !{i32 2, !"Dwarf Version", i32 4}
!6 = !{i32 2, !"Debug Info Version", i32 3}
!7 = !{!"clang version 9.0.0"}
!8 = distinct !DISubprogram(name: "test1", scope: !2, file: !2, line: 7, type: !9, scopeLine: 7, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, retainedNodes: !11)
!9 = !DISubroutineType(types: !10)
!10 = !{!4}
!11 = !{!12}
!12 = !DILocalVariable(name: "local", scope: !8, file: !2, line: 8, type: !13)
!13 = !DICompositeType(tag: DW_TAG_array_type, baseType: !4, size: 96, elements: !14)
!14 = !{!15}
!15 = !DISubrange(count: 3)
!16 = !DILocation(line: 8, scope: !8)
!17 = !DILocation(line: 9, scope: !8)
!18 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 7, type: !9, scopeLine: 7, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, retainedNodes: !11)
!19 = !DILocalVariable(name: "local", scope: !18, file: !2, line: 8, type: !13)
!20 = !DILocation(line: 15, scope: !18)
!21 = !DILocation(line: 16, scope: !18)
...
---
name: test1
tracksRegLiveness: true
body: |
bb.0.entry:
frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
renamable $edi = MOV32rm $rip, 1, $noreg, @global1, $noreg, debug-location !16 :: (dereferenceable load (s32) from @global1)
DBG_VALUE 456, $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 64, 32), debug-location !16
DBG_VALUE 123, $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 32, 32), debug-location !16
DBG_VALUE $edi, $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !16
$esi = MOV32ri 123, debug-location !16
CALL64pcrel32 @ext2, csr_64, implicit $rsp, implicit $ssp, implicit $edi, implicit killed $esi, implicit-def $rsp, implicit-def $ssp, debug-location !16
$eax = MOV32ri 123, debug-location !17
$rcx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !17
RET64 killed $eax, debug-location !17
...
# CHECK: .Ltmp1
# CHECK-NEXT: #DEBUG_VALUE: test1:local <- [DW_OP_LLVM_fragment 64 32] 456
# CHECK-NEXT: #DEBUG_VALUE: test1:local <- [DW_OP_LLVM_fragment 32 32] 123
# CHECK-NEXT: #DEBUG_VALUE: test1:local <- [DW_OP_LLVM_fragment 0 32] $edi
# CHECK: callq ext2
# CHECK-NEXT: .Ltmp2:
...
---
name: test2
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $rbx
frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !20
renamable $ebx = MOV32rm $rip, 1, $noreg, @global1, $noreg, debug-location !20 :: (dereferenceable load (s32) from @global1)
DBG_VALUE $ebx, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !20
renamable $esi = MOV32rm $rip, 1, $noreg, @global2, $noreg, debug-location !20 :: (dereferenceable load (s32) from @global2)
DBG_VALUE $esi, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 32, 32), debug-location !20
renamable $edx = MOV32rm $rip, 1, $noreg, @global3, $noreg, debug-location !20 :: (dereferenceable load (s32) from @global3)
DBG_VALUE $edx, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 64, 32), debug-location !20
$edi = MOV32rr $ebx, debug-location !20
CALL64pcrel32 @ext3, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit $esi, implicit $edx, implicit-def $rsp, implicit-def $ssp, debug-location !20
$eax = MOV32rr killed $ebx, debug-location !20
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !20
RET64 killed $eax, debug-location !21
...
# CHECK: .Ltmp4:
# CHECK-NEXT: #DEBUG_VALUE: test2:local <- [DW_OP_LLVM_fragment 0 32] $ebx
# CHECK: .Ltmp5:
# CHECK-NEXT: #DEBUG_VALUE: test2:local <- [DW_OP_LLVM_fragment 32 32] $esi
# CHECK: .Ltmp6:
# CHECK-NEXT: #DEBUG_VALUE: test2:local <- [DW_OP_LLVM_fragment 64 32] $edx
# CHECK: callq ext3
# CHECK-NEXT: .Ltmp7:
# CHECK: popq %rbx
# CHECK-NEXT: .Ltmp8:
#### Location list for test1:local.
# Verify that a location list entry, which does not contain the fragment that
# is described by the clobbered $edi, is emitted directly after the call to
# ext2().
# CHECK: .Ldebug_loc0:
# CHECK-NEXT: .quad .Ltmp1-.Lfunc_begin0
# CHECK-NEXT: .quad .Ltmp2-.Lfunc_begin0
# CHECK-NEXT: .short 14 # Loc expr size
# CHECK-NEXT: .byte 85 # super-register DW_OP_reg5
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .byte 16 # DW_OP_constu
# CHECK-NEXT: .byte 123 # 123
# CHECK-NEXT: .byte 159 # DW_OP_stack_value
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .byte 16 # DW_OP_constu
# CHECK-NEXT: .byte 200 # 456
# CHECK-NEXT: .byte 3 #
# CHECK-NEXT: .byte 159 # DW_OP_stack_value
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .quad .Ltmp2-.Lfunc_begin0
# CHECK-NEXT: .quad .Lfunc_end0-.Lfunc_begin0
# CHECK-NEXT: .short 13 # Loc expr size
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .byte 16 # DW_OP_constu
# CHECK-NEXT: .byte 123 # 123
# CHECK-NEXT: .byte 159 # DW_OP_stack_value
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .byte 16 # DW_OP_constu
# CHECK-NEXT: .byte 200 # 456
# CHECK-NEXT: .byte 3 #
# CHECK-NEXT: .byte 159 # DW_OP_stack_value
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .quad 0
# CHECK-NEXT: .quad 0
#### Location list for test2:local.
# Verify that the debug values that are described by $edi and $edx are
# considered clobbered by the call to ext3(), leaving a location list entry
# after the call where the first 32 bits are still described by $ebx.
# That location list entry is valid until the restore of the register.
# CHECK: .Ldebug_loc1:
# CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0
# CHECK-NEXT: .quad .Ltmp5-.Lfunc_begin0
# CHECK-NEXT: .short 3 # Loc expr size
# CHECK-NEXT: .byte 83 # super-register DW_OP_reg3
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .quad .Ltmp5-.Lfunc_begin0
# CHECK-NEXT: .quad .Ltmp6-.Lfunc_begin0
# CHECK-NEXT: .short 6 # Loc expr size
# CHECK-NEXT: .byte 83 # super-register DW_OP_reg3
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .byte 84 # super-register DW_OP_reg4
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .quad .Ltmp6-.Lfunc_begin0
# CHECK-NEXT: .quad .Ltmp7-.Lfunc_begin0
# CHECK-NEXT: .short 9 # Loc expr size
# CHECK-NEXT: .byte 83 # super-register DW_OP_reg3
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .byte 84 # super-register DW_OP_reg4
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .byte 81 # super-register DW_OP_reg1
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .quad .Ltmp7-.Lfunc_begin0
# CHECK-NEXT: .quad .Ltmp8-.Lfunc_begin0
# CHECK-NEXT: .short 3 # Loc expr size
# CHECK-NEXT: .byte 83 # super-register DW_OP_reg3
# CHECK-NEXT: .byte 147 # DW_OP_piece
# CHECK-NEXT: .byte 4 # 4
# CHECK-NEXT: .quad 0
# CHECK-NEXT: .quad 0
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