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[Debug-Info] add -gstrict-dwarf support in backend

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Reviewed By: dblaikie, probinson

Differential Revision: https://reviews.llvm.org/D100826
This commit is contained in:
Chen Zheng 2021-05-09 22:04:02 -04:00
parent 6555e53ab0
commit a0ca4c46ca
5 changed files with 74 additions and 0 deletions
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1
clang/lib/CodeGen/BackendUtil.cpp
View File

@ -598,6 +598,7 @@ static bool initTargetOptions(DiagnosticsEngine &Diags,
Entry.IgnoreSysRoot ? Entry.Path : HSOpts.Sysroot + Entry.Path);
Options.MCOptions.Argv0 = CodeGenOpts.Argv0;
Options.MCOptions.CommandLineArgs = CodeGenOpts.CommandLineArgs;
Options.DebugStrictDwarf = CodeGenOpts.DebugStrictDwarf;
return true;
}

2
llvm/include/llvm/CodeGen/CommandFlags.h
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@ -140,6 +140,8 @@ bool getForceDwarfFrameSection();
bool getXRayOmitFunctionIndex();
bool getDebugStrictDwarf();
/// Create this object with static storage to register codegen-related command
/// line options.
struct RegisterCodeGenFlags {

5
llvm/include/llvm/Target/TargetOptions.h
View File

@ -137,6 +137,7 @@ namespace llvm {
SupportsDebugEntryValues(false), EnableDebugEntryValues(false),
PseudoProbeForProfiling(false), ValueTrackingVariableLocations(false),
ForceDwarfFrameSection(false), XRayOmitFunctionIndex(false),
DebugStrictDwarf(false),
FPDenormalMode(DenormalMode::IEEE, DenormalMode::IEEE) {}
/// DisableFramePointerElim - This returns true if frame pointer elimination
@ -327,6 +328,10 @@ namespace llvm {
/// Emit XRay Function Index section
unsigned XRayOmitFunctionIndex : 1;
/// When set to true, don't use DWARF extensions in later DWARF versions.
/// By default, it is set to false.
unsigned DebugStrictDwarf : 1;
/// Stack protector guard offset to use.
int StackProtectorGuardOffset = INT_MAX;

6
llvm/lib/CodeGen/CommandFlags.cpp
View File

@ -97,6 +97,7 @@ CGOPT(bool, PseudoProbeForProfiling)
CGOPT(bool, ValueTrackingVariableLocations)
CGOPT(bool, ForceDwarfFrameSection)
CGOPT(bool, XRayOmitFunctionIndex)
CGOPT(bool, DebugStrictDwarf)
codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
#define CGBINDOPT(NAME) \
@ -471,6 +472,10 @@ codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
cl::init(false));
CGBINDOPT(XRayOmitFunctionIndex);
static cl::opt<bool> DebugStrictDwarf(
"strict-dwarf", cl::desc("use strict dwarf"), cl::init(false));
CGBINDOPT(DebugStrictDwarf);
#undef CGBINDOPT
mc::RegisterMCTargetOptionsFlags();
@ -567,6 +572,7 @@ codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations();
Options.ForceDwarfFrameSection = getForceDwarfFrameSection();
Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex();
Options.DebugStrictDwarf = getDebugStrictDwarf();
Options.MCOptions = mc::InitMCTargetOptionsFromFlags();

60
llvm/test/DebugInfo/PowerPC/strict-dwarf.ll Normal file
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@ -0,0 +1,60 @@
; RUN: llc -filetype=obj -mtriple=powerpc64le-unknown-linux-gnu < %s | \
; RUN: llvm-dwarfdump -debug-info - | FileCheck %s
; RUN: llc -filetype=obj -mtriple=powerpc64le-unknown-linux-gnu \
; RUN: -strict-dwarf=true < %s | llvm-dwarfdump -debug-info - | \
; RUN: FileCheck %s
; FIXME: when -strict-dwarf=true is specified, we should check "STRICT" to tell
; that with DWARF 4, we should not generate DWARF 5 attribute DW_AT_noreturn and
; DW_AT_alignment.
; CHECK: DW_AT_alignment
; CHECK: DW_AT_noreturn
; STRICT-NOT: DW_AT_noreturn
; STRICT-NOT: DW_AT_alignment
@_ZL3var = internal global i32 0, align 16, !dbg !0
; Function Attrs: noinline noreturn optnone uwtable mustprogress
define dso_local void @_Z1fv() #0 !dbg !12 {
entry:
call void @_Z4exitv(), !dbg !15
ret void, !dbg !16
}
declare void @_Z4exitv()
; Function Attrs: noinline nounwind optnone uwtable mustprogress
define dso_local signext i32 @_Z3foov() !dbg !17 {
entry:
%0 = load i32, i32* @_ZL3var, align 16, !dbg !21
ret i32 %0, !dbg !22
}
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8, !9, !10}
!llvm.ident = !{!11}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "var", linkageName: "_ZL3var", scope: !2, file: !3, line: 2, type: !6, isLocal: true, isDefinition: true, align: 128)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 13.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "t.cpp", directory: "./")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
!7 = !{i32 7, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 4}
!10 = !{i32 7, !"uwtable", i32 1}
!11 = !{!"clang version 13.0.0"}
!12 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !3, file: !3, line: 4, type: !13, scopeLine: 4, flags: DIFlagPrototyped | DIFlagNoReturn, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !4)
!13 = !DISubroutineType(types: !14)
!14 = !{null}
!15 = !DILocation(line: 5, column: 1, scope: !12)
!16 = !DILocation(line: 7, column: 1, scope: !12)
!17 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !3, file: !3, line: 10, type: !18, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !4)
!18 = !DISubroutineType(types: !19)
!19 = !{!20}
!20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!21 = !DILocation(line: 12, column: 18, scope: !17)
!22 = !DILocation(line: 12, column: 11, scope: !17)