maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/CodeGen/X86/machinesink-null-debuginfo.ll

50 lines
2.5 KiB
LLVM
Raw Normal View History

Fix out-of-order stepping behavior in programs with sunk instructions. MachineSink attempts to place instructions near the basic blocks where they are needed. Once an instruction has been sunk, its location relative to other instructions no longer is consistent with the original source code. In order to ensure correct stepping in the debugger, the debug location for sunk instructions is either merged with the insertion point or erased if the target successor block is empty. Originally submitted as r318679, revised to fix sanitizer failure and improve testing. Patch by Matthew Voss! Differential Revision: https://reviews.llvm.org/D39933 llvm-svn: 320216
2017-12-09 08:17:01 +08:00
; RUN: llc -simplify-mir -stop-after=machine-sink < %s -o - | FileCheck %s
; ModuleID = 'test-sink-debug.cpp'
source_filename = "test-sink-debug.cpp"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind readnone uwtable
define double @_Z3fooddb(double %x, double %y, i1 zeroext %c) local_unnamed_addr !dbg !7 {
tail call void @llvm.dbg.value(metadata double %x, metadata !13, metadata !DIExpression()), !dbg !16
tail call void @llvm.dbg.value(metadata double %y, metadata !14, metadata !DIExpression()), !dbg !17
tail call void @llvm.dbg.value(metadata i1 %c, metadata !15, metadata !DIExpression()), !dbg !18
%a = fdiv double %x, 3.000000e+00
Improve the test for r320216. NFC. Patch by Matthew Voss! llvm-svn: 321207
2017-12-21 03:11:31 +08:00
%b = fdiv double %y, 5.000000e+00, !dbg !19
Fix out-of-order stepping behavior in programs with sunk instructions. MachineSink attempts to place instructions near the basic blocks where they are needed. Once an instruction has been sunk, its location relative to other instructions no longer is consistent with the original source code. In order to ensure correct stepping in the debugger, the debug location for sunk instructions is either merged with the insertion point or erased if the target successor block is empty. Originally submitted as r318679, revised to fix sanitizer failure and improve testing. Patch by Matthew Voss! Differential Revision: https://reviews.llvm.org/D39933 llvm-svn: 320216
2017-12-09 08:17:01 +08:00
%cond = select i1 %c, double %a, double %b
Improve the test for r320216. NFC. Patch by Matthew Voss! llvm-svn: 321207
2017-12-21 03:11:31 +08:00
; CHECK-NOT: debug-location !19
ret double %cond, !dbg !20
Fix out-of-order stepping behavior in programs with sunk instructions. MachineSink attempts to place instructions near the basic blocks where they are needed. Once an instruction has been sunk, its location relative to other instructions no longer is consistent with the original source code. In order to ensure correct stepping in the debugger, the debug location for sunk instructions is either merged with the insertion point or erased if the target successor block is empty. Originally submitted as r318679, revised to fix sanitizer failure and improve testing. Patch by Matthew Voss! Differential Revision: https://reviews.llvm.org/D39933 llvm-svn: 320216
2017-12-09 08:17:01 +08:00
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 6.0.0 (trunk 313291)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test-sink-debug.cpp", 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 6.0.0 (trunk 313291)"}
[DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
2018-05-09 10:40:45 +08:00
!7 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooddb", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
Fix out-of-order stepping behavior in programs with sunk instructions. MachineSink attempts to place instructions near the basic blocks where they are needed. Once an instruction has been sunk, its location relative to other instructions no longer is consistent with the original source code. In order to ensure correct stepping in the debugger, the debug location for sunk instructions is either merged with the insertion point or erased if the target successor block is empty. Originally submitted as r318679, revised to fix sanitizer failure and improve testing. Patch by Matthew Voss! Differential Revision: https://reviews.llvm.org/D39933 llvm-svn: 320216
2017-12-09 08:17:01 +08:00
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !10, !10, !11}
!10 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
!11 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
!12 = !{!13, !14, !15}
!13 = !DILocalVariable(name: "x", arg: 1, scope: !7, file: !1, line: 1, type: !10)
!14 = !DILocalVariable(name: "y", arg: 2, scope: !7, file: !1, line: 1, type: !10)
!15 = !DILocalVariable(name: "c", arg: 3, scope: !7, file: !1, line: 1, type: !11)
!16 = !DILocation(line: 1, column: 19, scope: !7)
!17 = !DILocation(line: 1, column: 29, scope: !7)
!18 = !DILocation(line: 1, column: 37, scope: !7)
Improve the test for r320216. NFC. Patch by Matthew Voss! llvm-svn: 321207
2017-12-21 03:11:31 +08:00
!19 = !DILocation(line: 2, column: 26, scope: !7)
!20 = !DILocation(line: 2, column: 3, scope: !7)