66 lines
2.2 KiB
LLVM
66 lines
2.2 KiB
LLVM
|
; RUN: llc -O1 -o - %s | FileCheck %s
|
||
|
|
|
||
|
|
; Check that dbg.value(undef) calls are not simply discarded.
|
||
|
|
|
||
|
|
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
||
|
|
target triple = "x86_64-unknown-linux-gnu"
|
||
|
|
|
||
|
|
define void @foo() !dbg !7 {
|
||
|
|
entry:
|
||
|
|
call void @llvm.dbg.value(metadata i32 42, metadata !11, metadata !DIExpression()), !dbg !13
|
||
|
|
call void (...) @bar(), !dbg !14
|
||
|
|
call void @llvm.dbg.value(metadata i32 undef, metadata !11, metadata !DIExpression()), !dbg !13
|
||
|
|
call void (...) @bar(), !dbg !15
|
||
|
|
ret void, !dbg !16
|
||
|
|
}
|
||
|
|
|
||
|
|
declare void @bar(...)
|
||
|
|
|
||
|
|
; Function Attrs: nounwind readnone speculatable
|
||
|
|
declare void @llvm.dbg.value(metadata, metadata, metadata) #0
|
||
|
|
|
||
|
|
attributes #0 = { nounwind readnone speculatable }
|
||
|
|
|
||
|
|
!llvm.dbg.cu = !{!0}
|
||
|
|
!llvm.module.flags = !{!3, !4, !5}
|
||
|
|
!llvm.ident = !{!6}
|
||
|
|
|
||
|
|
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
|
||
|
|
!1 = !DIFile(filename: "test.c", directory: "/tmp")
|
||
|
|
!2 = !{}
|
||
|
|
!3 = !{i32 2, !"Dwarf Version", i32 4}
|
||
|
|
!4 = !{i32 2, !"Debug Info Version", i32 3}
|
||
|
|
!5 = !{i32 1, !"wchar_size", i32 4}
|
||
|
|
!6 = !{!"clang version 7.0.0"}
|
||
|
|
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !10)
|
||
|
|
!8 = !DISubroutineType(types: !9)
|
||
|
|
!9 = !{null}
|
||
|
|
!10 = !{!11}
|
||
|
|
!11 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 4, type: !12)
|
||
|
|
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||
|
|
!13 = !DILocation(line: 4, column: 7, scope: !7)
|
||
|
|
!14 = !DILocation(line: 5, column: 3, scope: !7)
|
||
|
|
!15 = !DILocation(line: 7, column: 3, scope: !7)
|
||
|
|
!16 = !DILocation(line: 8, column: 1, scope: !7)
|
||
|
|
|
||
|
|
; Original C program:
|
||
|
|
; void bar();
|
||
|
|
;
|
||
|
|
; void foo() {
|
||
|
|
; int x = 42;
|
||
|
|
; bar();
|
||
|
|
; x = 23;
|
||
|
|
; bar();
|
||
|
|
; }
|
||
|
|
;
|
||
|
|
; Then the dbg.value for the x = 23 setting has been replaced with dbg.value(undef)
|
||
|
|
; in this ll file to provoke the wanted behavior in LiveDebugVariables.
|
||
|
|
|
||
|
|
; Variable 'x' should thus be updated two times, first to 42 and then to undef.
|
||
|
|
|
||
|
|
; CHECK-LABEL: foo:
|
||
|
|
; CHECK: #DEBUG_VALUE: foo:x <- 42
|
||
|
|
; CHECK: callq bar
|
||
|
|
; CHECK: #DEBUG_VALUE: foo:x <- undef
|
||
|
|
; CHECK: callq bar
|