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Fix cas-friendly line table emission in llvm #6718

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Merged
merged 1 commit into from
May 10, 2023
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Fix cas-friendly line table emission in llvm #6718

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2 changes: 1 addition & 1 deletion llvm/include/llvm/MC/MCDwarf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -230,7 +230,7 @@ class MCLineSection {

// Add an end entry by cloning the last entry, if exists, for the section
// the given EndLabel belongs to. The label is replaced by the given EndLabel.
void addEndEntry(MCSymbol *EndLabel);
void addEndEntry(MCSymbol *EndLabel, bool CasFriendlyDebugInfo = false);

using MCDwarfLineEntryCollection = std::vector<MCDwarfLineEntry>;
using iterator = MCDwarfLineEntryCollection::iterator;
Expand Down
10 changes: 10 additions & 0 deletions llvm/include/llvm/MC/MCStreamer.h
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Expand Up @@ -254,6 +254,9 @@ class MCStreamer {
/// discussion for future inclusion.
bool AllowAutoPadding = false;

/// Generate debug info that is Cas Friendly
bool GenerateCasFriendlyDebugInfo = false;

protected:
MCStreamer(MCContext &Ctx);

Expand Down Expand Up @@ -308,6 +311,13 @@ class MCStreamer {
void setAllowAutoPadding(bool v) { AllowAutoPadding = v; }
bool getAllowAutoPadding() const { return AllowAutoPadding; }

void setGenerateCasFriendlyDebugInfo(bool v) {
GenerateCasFriendlyDebugInfo = v;
}
bool getGenerateCasFriendlyDebugInfo() const {
return GenerateCasFriendlyDebugInfo;
}

/// When emitting an object file, create and emit a real label. When emitting
/// textual assembly, this should do nothing to avoid polluting our output.
virtual MCSymbol *emitCFILabel();
Expand Down
7 changes: 4 additions & 3 deletions llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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Expand Up @@ -464,7 +464,7 @@ DwarfDebug::DwarfDebug(AsmPrinter *A)
Asm->OutStreamer->getContext().setDwarfFormat(Dwarf64 ? dwarf::DWARF64
: dwarf::DWARF32);

GenerateCasFriendlyDebugInfo = CasFriendlyDebugInfo;
Asm->OutStreamer->setGenerateCasFriendlyDebugInfo(CasFriendlyDebugInfo);
}

// Define out of line so we don't have to include DwarfUnit.h in DwarfDebug.h.
Expand Down Expand Up @@ -2215,7 +2215,8 @@ void DwarfDebug::terminateLineTable(const DwarfCompileUnit *CU) {
getDwarfCompileUnitIDForLineTable(*CU));
// Add the last range label for the given CU.
LineTable.getMCLineSections().addEndEntry(
const_cast<MCSymbol *>(CURanges.back().End));
const_cast<MCSymbol *>(CURanges.back().End),
Asm->OutStreamer->getGenerateCasFriendlyDebugInfo());
}

void DwarfDebug::skippedNonDebugFunction() {
Expand Down Expand Up @@ -2311,7 +2312,7 @@ void DwarfDebug::endFunctionImpl(const MachineFunction *MF) {
// we want to split up the line tables by function. To do this, we want to
// emit a DW_LNE_end_sequence at the end of a function's contribution to the
// line table.
if (GenerateCasFriendlyDebugInfo) {
if (Asm->OutStreamer->getGenerateCasFriendlyDebugInfo()) {
MCSymbol *LineSym = Asm->OutStreamer->getContext().createTempSymbol();
Asm->OutStreamer->emitLabel(LineSym);
MCDwarfLoc DwarfLoc(
Expand Down
3 changes: 0 additions & 3 deletions llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
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Expand Up @@ -379,9 +379,6 @@ class DwarfDebug : public DebugHandlerBase {
/// Avoid using DW_OP_convert due to consumer incompatibilities.
bool EnableOpConvert;

/// Generate debug info that is Cas Friendly
bool GenerateCasFriendlyDebugInfo;

public:
enum class MinimizeAddrInV5 {
Default,
Expand Down
30 changes: 15 additions & 15 deletions llvm/lib/MC/MCDwarf.cpp
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Expand Up @@ -144,21 +144,26 @@ makeStartPlusIntExpr(MCContext &Ctx, const MCSymbol &Start, int IntVal) {
return Res;
}

void MCLineSection::addEndEntry(MCSymbol *EndLabel) {
void MCLineSection::addEndEntry(MCSymbol *EndLabel, bool CasFriendlyDebugInfo) {
auto *Sec = &EndLabel->getSection();
// The line table may be empty, which we should skip adding an end entry.
// There are two cases:
// There are three cases:
// (1) MCAsmStreamer - emitDwarfLocDirective emits a location directive in
// place instead of adding a line entry if the target has
// usesDwarfFileAndLocDirectives.
// (2) MCObjectStreamer - if a function has incomplete debug info where
// instructions don't have DILocations, the line entries are missing.
// (3) If the debug info is cas friendly, there is an end_sequence after every
// function and another one doesn't have to be emitted at the end of the line
// table.
auto I = MCLineDivisions.find(Sec);
if (I != MCLineDivisions.end()) {
auto &Entries = I->second;
auto EndEntry = Entries.back();
EndEntry.setEndLabel(EndLabel);
Entries.push_back(EndEntry);
if (!CasFriendlyDebugInfo) {
EndEntry.setEndLabel(EndLabel);
Entries.push_back(EndEntry);
}
}
}

Expand All @@ -173,7 +178,9 @@ void MCDwarfLineTable::emitOne(
unsigned FileNum, LastLine, Column, Flags, Isa, Discriminator;
MCSymbol *LastLabel;
auto init = [&]() {
FileNum = 1;
// Force emission of DW_LNS_set_file for every function's contribution to
// the line table to maximize deduplication.
FileNum = MCOS->getGenerateCasFriendlyDebugInfo() ? 0 : 1;
LastLine = 1;
Column = 0;
Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
Expand All @@ -188,29 +195,22 @@ void MCDwarfLineTable::emitOne(
for (const MCDwarfLineEntry &LineEntry : LineEntries) {
MCSymbol *Label = LineEntry.getLabel();
const MCAsmInfo *asmInfo = MCOS->getContext().getAsmInfo();
if (LineEntry.IsEndEntry) {
if (LineEntry.IsEndEntry || LineEntry.IsEndOfFunction) {
MCOS->emitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, Label,
asmInfo->getCodePointerSize());
init();
EndEntryEmitted = true;
continue;
}
if (LineEntry.IsEndOfFunction) {
MCOS->emitInt8(char(dwarf::DW_LNS_extended_op));
MCOS->emitInt8(char(1));
MCOS->emitInt8(char(dwarf::DW_LNE_end_sequence));
init();
continue;
}

int64_t LineDelta = static_cast<int64_t>(LineEntry.getLine()) - LastLine;

if (FileNum != LineEntry.getFileNum() || LineEntry.IsEndOfFunction) {
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@felipepiovezan felipepiovezan May 9, 2023 •
edited
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I'm confused about the previous code: was this || LineEntry.IsEndOfFunction ever relevant? Because right above we continue for this state 🤔

But I see now that most removals here are actually restoring the code to its upstream state

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Yes, that part was not needed, and I have removed it. I am sorry for the confusion on that.

if (FileNum != LineEntry.getFileNum()) {
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This looks like there could be some NFC refactoring done upstream first? Such as moving the LineEntry.IsEndOfFunction higher up? Might make maintaining the patch easier.

FileNum = LineEntry.getFileNum();
MCOS->emitInt8(dwarf::DW_LNS_set_file);
MCOS->emitULEB128IntValue(FileNum);
}
if (Column != LineEntry.getColumn() || LineEntry.IsEndOfFunction) {
if (Column != LineEntry.getColumn()) {
Column = LineEntry.getColumn();
MCOS->emitInt8(dwarf::DW_LNS_set_column);
MCOS->emitULEB128IntValue(Column);
Expand Down
160 changes: 95 additions & 65 deletions llvm/test/DebugInfo/CAS/AArch64/debug_line_and_info_dedupe.test
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Expand Up @@ -11,8 +11,8 @@ CHECK-NEXT: DW_TAG_compile_unit
CHECK: CAS Block: llvmcas://[[SUBPROGRAM_FOO:[a-z0-9]+]]
CHECK-NEXT: DW_TAG_subprogram
CHECK: mc:debug_line llvmcas://
CHECK-NEXT: mc:debug_line llvmcas://
CHECK-NEXT: mc:debug_line llvmcas://[[LINETABLECASID:[a-z0-9]+]]
CHECK-NEXT: mc:debug_line llvmcas://


CHECK: mc:assembler
Expand All @@ -22,79 +22,109 @@ CHECK: CAS Block: llvmcas://[[SUBPROGRAM_FOO]]
CHECK-NEXT: DW_TAG_subprogram
CHECK: mc:debug_line llvmcas://
CHECK-NEXT: mc:debug_line llvmcas://
CHECK-NEXT: mc:debug_line llvmcas://
CHECK-NEXT: mc:debug_line llvmcas://[[LINETABLECASID]]
CHECK-NEXT: mc:debug_line llvmcas://

//--- a.ll

target triple = "arm64-apple-macosx12.0.0"
define void @foo() #0 !dbg !9 {
ret void, !dbg !14
; ModuleID = 'a.cpp'
source_filename = "a.cpp"
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-macosx13.0.0"

; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @_Z3foov() #0 !dbg !10 {
ret i32 3, !dbg !16
}
define void @bar(i32 noundef %x) #0 !dbg !15 {
ret void, !dbg !23

; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @_Z4foo2v() #0 !dbg !17 {
ret i32 4, !dbg !18
}
attributes #0 = { noinline nounwind optnone ssp uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+cx8,+fxsr,+mmx,+sahf,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "tune-cpu"="generic" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 16.0.0 (https://github.com/apple/llvm-project.git d74d0d9fde90cccba7bf18066ac56e55e4402948)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None, sysroot: "/")
!1 = !DIFile(filename: "a.c", directory: "/Users/shubham/Development/CASDelta")
!2 = !{i32 7, !"Dwarf Version", i32 4}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 7, !"PIC Level", i32 2}
!6 = !{i32 7, !"uwtable", i32 2}
!7 = !{i32 7, !"frame-pointer", i32 2}
!9 = distinct !DISubprogram(name: "foo", scope: !10, file: !10, line: 1, type: !11, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !13)
!10 = !DIFile(filename: "./foo.h", directory: "/Users/shubham/Development/CASDelta")
!11 = !DISubroutineType(types: !12)
!12 = !{null}
!13 = !{}
!14 = !DILocation(line: 2, column: 3, scope: !9)
!15 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 2, type: !16, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !13)
!16 = !DISubroutineType(types: !17)
!17 = !{!18, !18}
!18 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!23 = !DILocation(line: 3, column: 3, scope: !15)

; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @_Z3barv() #0 !dbg !19 {
ret i32 2, !dbg !20
}

!llvm.module.flags = !{!0, !1, !2, !3, !4, !5, !6}
!llvm.dbg.cu = !{!7}
!llvm.ident = !{!9}

!0 = !{i32 2, !"SDK Version", [2 x i32] [i32 14, i32 0]}
!1 = !{i32 7, !"Dwarf Version", i32 4}
!2 = !{i32 2, !"Debug Info Version", i32 3}
!3 = !{i32 1, !"wchar_size", i32 4}
!4 = !{i32 8, !"PIC Level", i32 2}
!5 = !{i32 7, !"uwtable", i32 1}
!6 = !{i32 7, !"frame-pointer", i32 1}
!7 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !8, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None, sysroot: "/Users/somepath", sdk: "MacOSX.sdk")
!8 = !DIFile(filename: "a.cpp", directory: "/Users/shubham/Development/testclang")
!9 = !{!"clang"}
!10 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !11, file: !11, line: 1, type: !12, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !15)
!11 = !DIFile(filename: "./foo.h", directory: "/Users/shubham/Development/testclang")
!12 = !DISubroutineType(types: !13)
!13 = !{!14}
!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!15 = !{}
!16 = !DILocation(line: 2, column: 3, scope: !10)
!17 = distinct !DISubprogram(name: "foo2", linkageName: "_Z4foo2v", scope: !11, file: !11, line: 4, type: !12, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !15)
!18 = !DILocation(line: 5, column: 3, scope: !17)
!19 = distinct !DISubprogram(name: "bar", linkageName: "_Z3barv", scope: !8, file: !8, line: 2, type: !12, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !15)
!20 = !DILocation(line: 3, column: 3, scope: !19)


//--- b.ll

target triple = "arm64-apple-macosx12.0.0"
define i32 @baz() #0 !dbg !9 {
ret i32 1, !dbg !14
; ModuleID = 'b.cpp'
source_filename = "b.cpp"
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-macosx13.0.0"

; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @_Z3bazv() #0 !dbg !10 {
ret i32 1, !dbg !15
}

; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @_Z3foov() #0 !dbg !16 {
ret i32 3, !dbg !18
}
define void @foo() #0 !dbg !15 {
ret void, !dbg !19

; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @_Z4foo2v() #0 !dbg !19 {
ret i32 4, !dbg !20
}
define void @bar(i32 noundef %x) #0 !dbg !20 {
entry:
ret void, !dbg !27

; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @_Z3barv() #0 !dbg !21 {
ret i32 2, !dbg !22
}
attributes #0 = { noinline nounwind optnone ssp uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+cx8,+fxsr,+mmx,+sahf,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "tune-cpu"="generic" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 16.0.0 (https://github.com/apple/llvm-project.git d74d0d9fde90cccba7bf18066ac56e55e4402948)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None, sysroot: "/")
!1 = !DIFile(filename: "b.c", directory: "/Users/shubham/Development/CASDelta")
!2 = !{i32 7, !"Dwarf Version", i32 4}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 7, !"PIC Level", i32 2}
!6 = !{i32 7, !"uwtable", i32 2}
!7 = !{i32 7, !"frame-pointer", i32 2}
!9 = distinct !DISubprogram(name: "baz", scope: !1, file: !1, line: 1, type: !10, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !13)
!10 = !DISubroutineType(types: !11)
!11 = !{!12}
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{}
!14 = !DILocation(line: 2, column: 5, scope: !9)
!15 = distinct !DISubprogram(name: "foo", scope: !16, file: !16, line: 1, type: !17, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !13)
!16 = !DIFile(filename: "./foo.h", directory: "/Users/shubham/Development/CASDelta")
!17 = !DISubroutineType(types: !18)
!18 = !{null}
!19 = !DILocation(line: 2, column: 3, scope: !15)
!20 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 6, type: !21, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !13)
!21 = !DISubroutineType(types: !22)
!22 = !{!12, !12}
!25 = !DILocation(line: 7, column: 10, scope: !20)
!26 = !DILocation(line: 7, column: 11, scope: !20)
!27 = !DILocation(line: 7, column: 3, scope: !20)

!llvm.module.flags = !{!0, !1, !2, !3, !4, !5, !6}
!llvm.dbg.cu = !{!7}
!llvm.ident = !{!9}

!0 = !{i32 2, !"SDK Version", [2 x i32] [i32 14, i32 0]}
!1 = !{i32 7, !"Dwarf Version", i32 4}
!2 = !{i32 2, !"Debug Info Version", i32 3}
!3 = !{i32 1, !"wchar_size", i32 4}
!4 = !{i32 8, !"PIC Level", i32 2}
!5 = !{i32 7, !"uwtable", i32 1}
!6 = !{i32 7, !"frame-pointer", i32 1}
!7 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !8, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None, sysroot: "/Users/somepath", sdk: "MacOSX.some.sdk")
!8 = !DIFile(filename: "b.cpp", directory: "/Users/shubham/Development/testclang")
!9 = !{!"clang"}
!10 = distinct !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !8, file: !8, line: 1, type: !11, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !14)
!11 = !DISubroutineType(types: !12)
!12 = !{!13}
!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!14 = !{}
!15 = !DILocation(line: 2, column: 5, scope: !10)
!16 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !17, file: !17, line: 1, type: !11, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !14)
!17 = !DIFile(filename: "./foo.h", directory: "/Users/shubham/Development/testclang")
!18 = !DILocation(line: 2, column: 3, scope: !16)
!19 = distinct !DISubprogram(name: "foo2", linkageName: "_Z4foo2v", scope: !17, file: !17, line: 4, type: !11, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !14)
!20 = !DILocation(line: 5, column: 3, scope: !19)
!21 = distinct !DISubprogram(name: "bar", linkageName: "_Z3barv", scope: !8, file: !8, line: 5, type: !11, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !14)
!22 = !DILocation(line: 6, column: 5, scope: !21)
1 change: 0 additions & 1 deletion llvm/test/DebugInfo/X86/cas-friendly.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,6 @@
; CHECK-NEXT: 0x{{[0-9a-z]+}} 10 2 1 0 0
; CHECK-NEXT: 0x{{[0-9a-z]+}} 10 2 1 0 0 epilogue_begin
; CHECK-NEXT: 0x{{[0-9a-z]+}} 10 2 1 0 0 end_sequence
; CHECK-NEXT: 0x{{[0-9a-z]+}} 1 0 1 0 0 is_stmt end_sequence

; ModuleID = './test.c'
source_filename = "./test.c"
Expand Down
4 changes: 1 addition & 3 deletions llvm/test/tools/llvm-cas-dump/basic_debug_test.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,7 @@
; DWARF: version: 4
; DWARF: prologue_length: 0x000000{{[0-9a-f]+}}
; DWARF: 0x0000000000000000 3 3 1 0 0 is_stmt prologue_end
; DWARF: 0x0000000000000000 3 3 1 0 0 is_stmt end_sequence
; DWARF: 0x0000000000000008 1 0 1 0 0 is_stmt end_sequence
; DWARF: 0x0000000000000008 3 3 1 0 0 is_stmt end_sequence

; CHECK: mc:assembler llvmcas://{{.*}}
; CHECK-NEXT: mc:header llvmcas://{{.*}}
Expand All @@ -44,7 +43,6 @@
; CHECK-NEXT: mc:debug_line_section llvmcas://{{.*}}
; CHECK-NEXT: mc:debug_line_distinct_data llvmcas://{{.*}}
; CHECK-NEXT: mc:debug_line llvmcas://{{.*}}
; CHECK-NEXT: mc:debug_line llvmcas://{{.*}}
; CHECK-NEXT: mc:padding llvmcas://{{.*}}
; CHECK-NEXT: mc:data_in_code llvmcas://{{.*}}
; CHECK-NEXT: mc:symbol_table llvmcas://{{.*}}
Expand Down