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Revert "[InstrProf] Attach debug info to counters" 

This reverts commit 800bf8ed29.

The `Instrumentation/InstrProfiling/debug-info-correlate.ll` test was
failing because I forgot the `llc` commands are architecture specific.
I'll follow up with a fix.

Differential Revision: https://reviews.llvm.org/D115689
This commit is contained in:
Ellis Hoag 2021-12-13 18:08:57 -08:00
parent 800bf8ed29
commit c809da7d9c
13 changed files with 24 additions and 199 deletions
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17
clang/lib/CodeGen/BackendUtil.cpp
View File

@ -94,17 +94,10 @@ using namespace llvm;
llvm::PassPluginLibraryInfo get##Ext##PluginInfo();
#include "llvm/Support/Extension.def"
namespace llvm {
extern cl::opt<bool> DebugInfoCorrelate;
}
namespace {
// Default filename used for profile generation.
Twine getDefaultProfileGenName() {
const Twine Extension = DebugInfoCorrelate ? "proflite" : "profraw";
return "default_%m." + Extension;
}
static constexpr StringLiteral DefaultProfileGenName = "default_%m.profraw";
class EmitAssemblyHelper {
DiagnosticsEngine &Diags;
@ -893,7 +886,7 @@ void EmitAssemblyHelper::CreatePasses(legacy::PassManager &MPM,
if (!CodeGenOpts.InstrProfileOutput.empty())
PMBuilder.PGOInstrGen = CodeGenOpts.InstrProfileOutput;
else
PMBuilder.PGOInstrGen = getDefaultProfileGenName().str();
PMBuilder.PGOInstrGen = std::string(DefaultProfileGenName);
}
if (CodeGenOpts.hasProfileIRUse()) {
PMBuilder.PGOInstrUse = CodeGenOpts.ProfileInstrumentUsePath;
@ -1238,7 +1231,7 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
if (CodeGenOpts.hasProfileIRInstr())
// -fprofile-generate.
PGOOpt = PGOOptions(CodeGenOpts.InstrProfileOutput.empty()
? getDefaultProfileGenName().str()
? std::string(DefaultProfileGenName)
: CodeGenOpts.InstrProfileOutput,
"", "", PGOOptions::IRInstr, PGOOptions::NoCSAction,
CodeGenOpts.DebugInfoForProfiling);
@ -1276,13 +1269,13 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
"Cannot run CSProfileGen pass with ProfileGen or SampleUse "
" pass");
PGOOpt->CSProfileGenFile = CodeGenOpts.InstrProfileOutput.empty()
? getDefaultProfileGenName().str()
? std::string(DefaultProfileGenName)
: CodeGenOpts.InstrProfileOutput;
PGOOpt->CSAction = PGOOptions::CSIRInstr;
} else
PGOOpt = PGOOptions("",
CodeGenOpts.InstrProfileOutput.empty()
? getDefaultProfileGenName().str()
? std::string(DefaultProfileGenName)
: CodeGenOpts.InstrProfileOutput,
"", PGOOptions::NoAction, PGOOptions::CSIRInstr,
CodeGenOpts.DebugInfoForProfiling);

4
compiler-rt/include/profile/InstrProfData.inc
View File

@ -653,17 +653,15 @@ serializeValueProfDataFrom(ValueProfRecordClosure *Closure,
/* Profile version is always of type uint64_t. Reserve the upper 8 bits in the
* version for other variants of profile. We set the lowest bit of the upper 8
* bits (i.e. bit 56) to 1 to indicate if this is an IR-level instrumentation
* bits (i.e. bit 56) to 1 to indicate if this is an IR-level instrumentaiton
* generated profile, and 0 if this is a Clang FE generated profile.
* 1 in bit 57 indicates there are context-sensitive records in the profile.
* The 59th bit indicates whether to use debug info to correlate profiles.
*/
#define VARIANT_MASKS_ALL 0xff00000000000000ULL
#define GET_VERSION(V) ((V) & ~VARIANT_MASKS_ALL)
#define VARIANT_MASK_IR_PROF (0x1ULL << 56)
#define VARIANT_MASK_CSIR_PROF (0x1ULL << 57)
#define VARIANT_MASK_INSTR_ENTRY (0x1ULL << 58)
#define VARIANT_MASK_DBG_CORRELATE (0x1ULL << 59)
#define INSTR_PROF_RAW_VERSION_VAR __llvm_profile_raw_version
#define INSTR_PROF_PROFILE_RUNTIME_VAR __llvm_profile_runtime
#define INSTR_PROF_PROFILE_COUNTER_BIAS_VAR __llvm_profile_counter_bias

2
compiler-rt/lib/profile/InstrProfiling.c
View File

@ -38,7 +38,7 @@ __llvm_profile_get_num_padding_bytes(uint64_t SizeInBytes) {
}
COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_version(void) {
return INSTR_PROF_RAW_VERSION_VAR;
return __llvm_profile_raw_version;
}
COMPILER_RT_VISIBILITY void __llvm_profile_reset_counters(void) {

5
compiler-rt/lib/profile/InstrProfilingMerge.c
View File

@ -95,11 +95,6 @@ static uintptr_t signextIfWin64(void *V) {
COMPILER_RT_VISIBILITY
int __llvm_profile_merge_from_buffer(const char *ProfileData,
uint64_t ProfileSize) {
int DebugInfoCorrelate =
(__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) != 0ULL;
if (DebugInfoCorrelate)
return 1;
__llvm_profile_data *SrcDataStart, *SrcDataEnd, *SrcData, *DstData;
__llvm_profile_header *Header = (__llvm_profile_header *)ProfileData;
uint64_t *SrcCountersStart;

21
compiler-rt/lib/profile/InstrProfilingWriter.c
View File

@ -259,19 +259,16 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
const uint64_t *CountersBegin, const uint64_t *CountersEnd,
VPDataReaderType *VPDataReader, const char *NamesBegin,
const char *NamesEnd, int SkipNameDataWrite) {
int DebugInfoCorrelate =
(__llvm_profile_get_version() & VARIANT_MASK_DBG_CORRELATE) != 0ULL;
/* Calculate size of sections. */
const uint64_t DataSize =
DebugInfoCorrelate ? 0 : __llvm_profile_get_data_size(DataBegin, DataEnd);
const uint64_t DataSize = __llvm_profile_get_data_size(DataBegin, DataEnd);
const uint64_t CountersSize = CountersEnd - CountersBegin;
const uint64_t NamesSize = DebugInfoCorrelate ? 0 : NamesEnd - NamesBegin;
const uint64_t NamesSize = NamesEnd - NamesBegin;
/* Create the header. */
__llvm_profile_header Header;
if (!DataSize && (!DebugInfoCorrelate || !CountersSize))
if (!DataSize)
return 0;
/* Determine how much padding is needed before/after the counters and after
@ -292,12 +289,6 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
Header.CountersDelta = (uint32_t)Header.CountersDelta;
#endif
/* The data and names sections are omitted in lightweight mode. */
if (DebugInfoCorrelate) {
Header.CountersDelta = 0;
Header.NamesDelta = 0;
}
/* Write the profile header. */
ProfDataIOVec IOVec[] = {{&Header, sizeof(__llvm_profile_header), 1, 0}};
if (Writer->Write(Writer, IOVec, sizeof(IOVec) / sizeof(*IOVec)))
@ -309,13 +300,11 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
/* Write the profile data. */
ProfDataIOVec IOVecData[] = {
{DebugInfoCorrelate ? NULL : DataBegin, sizeof(__llvm_profile_data),
DataSize, 0},
{DataBegin, sizeof(__llvm_profile_data), DataSize, 0},
{NULL, sizeof(uint8_t), PaddingBytesBeforeCounters, 1},
{CountersBegin, sizeof(uint64_t), CountersSize, 0},
{NULL, sizeof(uint8_t), PaddingBytesAfterCounters, 1},
{(SkipNameDataWrite || DebugInfoCorrelate) ? NULL : NamesBegin,
sizeof(uint8_t), NamesSize, 0},
{SkipNameDataWrite ? NULL : NamesBegin, sizeof(uint8_t), NamesSize, 0},
{NULL, sizeof(uint8_t), PaddingBytesAfterNames, 1}};
if (Writer->Write(Writer, IOVecData, sizeof(IOVecData) / sizeof(*IOVecData)))
return -1;

3
llvm/include/llvm/ProfileData/InstrProf.h
View File

@ -1149,8 +1149,7 @@ void getMemOPSizeRangeFromOption(StringRef Str, int64_t &RangeStart,
// Create a COMDAT variable INSTR_PROF_RAW_VERSION_VAR to make the runtime
// aware this is an ir_level profile so it can set the version flag.
GlobalVariable *createIRLevelProfileFlagVar(Module &M, bool IsCS,
bool InstrEntryBBEnabled,
bool DebugInfoCorrelate);
bool InstrEntryBBEnabled);
// Create the variable for the profile file name.
void createProfileFileNameVar(Module &M, StringRef InstrProfileOutput);

4
llvm/include/llvm/ProfileData/InstrProfData.inc
View File

@ -653,17 +653,15 @@ serializeValueProfDataFrom(ValueProfRecordClosure *Closure,
/* Profile version is always of type uint64_t. Reserve the upper 8 bits in the
* version for other variants of profile. We set the lowest bit of the upper 8
* bits (i.e. bit 56) to 1 to indicate if this is an IR-level instrumentation
* bits (i.e. bit 56) to 1 to indicate if this is an IR-level instrumentaiton
* generated profile, and 0 if this is a Clang FE generated profile.
* 1 in bit 57 indicates there are context-sensitive records in the profile.
* The 59th bit indicates whether to use debug info to correlate profiles.
*/
#define VARIANT_MASKS_ALL 0xff00000000000000ULL
#define GET_VERSION(V) ((V) & ~VARIANT_MASKS_ALL)
#define VARIANT_MASK_IR_PROF (0x1ULL << 56)
#define VARIANT_MASK_CSIR_PROF (0x1ULL << 57)
#define VARIANT_MASK_INSTR_ENTRY (0x1ULL << 58)
#define VARIANT_MASK_DBG_CORRELATE (0x1ULL << 59)
#define INSTR_PROF_RAW_VERSION_VAR __llvm_profile_raw_version
#define INSTR_PROF_PROFILE_RUNTIME_VAR __llvm_profile_runtime
#define INSTR_PROF_PROFILE_COUNTER_BIAS_VAR __llvm_profile_counter_bias

12
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -842,17 +842,13 @@ void DwarfUnit::addAnnotation(DIE &Buffer, DINodeArray Annotations) {
for (const Metadata *Annotation : Annotations->operands()) {
const MDNode *MD = cast<MDNode>(Annotation);
const MDString *Name = cast<MDString>(MD->getOperand(0));
const auto &Value = MD->getOperand(1);
// Currently, only MDString is supported with btf_decl_tag attribute.
const MDString *Value = cast<MDString>(MD->getOperand(1));
DIE &AnnotationDie = createAndAddDIE(dwarf::DW_TAG_LLVM_annotation, Buffer);
addString(AnnotationDie, dwarf::DW_AT_name, Name->getString());
if (const auto *Data = dyn_cast<MDString>(Value))
addString(AnnotationDie, dwarf::DW_AT_const_value, Data->getString());
else if (const auto *Data = dyn_cast<ConstantAsMetadata>(Value))
addConstantValue(AnnotationDie, Data->getValue()->getUniqueInteger(),
/*Unsigned=*/true);
else
assert(false && "Unsupported annotation value type");
addString(AnnotationDie, dwarf::DW_AT_const_value, Value->getString());
}
}

5
llvm/lib/ProfileData/InstrProf.cpp
View File

@ -1175,8 +1175,7 @@ bool canRenameComdatFunc(const Function &F, bool CheckAddressTaken) {
// Create a COMDAT variable INSTR_PROF_RAW_VERSION_VAR to make the runtime
// aware this is an ir_level profile so it can set the version flag.
GlobalVariable *createIRLevelProfileFlagVar(Module &M, bool IsCS,
bool InstrEntryBBEnabled,
bool DebugInfoCorrelate) {
bool InstrEntryBBEnabled) {
const StringRef VarName(INSTR_PROF_QUOTE(INSTR_PROF_RAW_VERSION_VAR));
Type *IntTy64 = Type::getInt64Ty(M.getContext());
uint64_t ProfileVersion = (INSTR_PROF_RAW_VERSION | VARIANT_MASK_IR_PROF);
@ -1184,8 +1183,6 @@ GlobalVariable *createIRLevelProfileFlagVar(Module &M, bool IsCS,
ProfileVersion |= VARIANT_MASK_CSIR_PROF;
if (InstrEntryBBEnabled)
ProfileVersion |= VARIANT_MASK_INSTR_ENTRY;
if (DebugInfoCorrelate)
ProfileVersion |= VARIANT_MASK_DBG_CORRELATE;
auto IRLevelVersionVariable = new GlobalVariable(
M, IntTy64, true, GlobalValue::WeakAnyLinkage,
Constant::getIntegerValue(IntTy64, APInt(64, ProfileVersion)), VarName);

1
llvm/lib/ProfileData/InstrProfWriter.cpp
View File

@ -32,7 +32,6 @@
#include <vector>
using namespace llvm;
extern cl::opt<bool> DebugInfoCorrelate;
// A struct to define how the data stream should be patched. For Indexed
// profiling, only uint64_t data type is needed.

60
llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
View File

@ -26,9 +26,7 @@
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
@ -59,13 +57,6 @@ using namespace llvm;
#define DEBUG_TYPE "instrprof"
namespace llvm {
cl::opt<bool>
DebugInfoCorrelate("debug-info-correlate", cl::ZeroOrMore,
cl::desc("Use debug info to correlate profiles."),
cl::init(false));
} // namespace llvm
namespace {
cl::opt<bool> DoHashBasedCounterSplit(
@ -650,12 +641,6 @@ void InstrProfiling::computeNumValueSiteCounts(InstrProfValueProfileInst *Ind) {
}
void InstrProfiling::lowerValueProfileInst(InstrProfValueProfileInst *Ind) {
// TODO: Value profiling heavily depends on the data section which is omitted
// in lightweight mode. We need to move the value profile pointer to the
// Counter struct to get this working.
assert(
!DebugInfoCorrelate &&
"Value profiling is not yet supported with lightweight instrumentation");
GlobalVariable *Name = Ind->getName();
auto It = ProfileDataMap.find(Name);
assert(It != ProfileDataMap.end() && It->second.DataVar &&
@ -870,12 +855,6 @@ InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
GlobalValue::LinkageTypes Linkage = NamePtr->getLinkage();
GlobalValue::VisibilityTypes Visibility = NamePtr->getVisibility();
// Use internal rather than private linkage so the counter variable shows up
// in the symbol table when using debug info for correlation.
if (DebugInfoCorrelate && TT.isOSBinFormatMachO() &&
Linkage == GlobalValue::PrivateLinkage)
Linkage = GlobalValue::InternalLinkage;
// Due to the limitation of binder as of 2021/09/28, the duplicate weak
// symbols in the same csect won't be discarded. When there are duplicate weak
// symbols, we can NOT guarantee that the relocations get resolved to the
@ -937,42 +916,6 @@ InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
MaybeSetComdat(CounterPtr);
CounterPtr->setLinkage(Linkage);
PD.RegionCounters = CounterPtr;
if (DebugInfoCorrelate) {
if (auto *SP = Fn->getSubprogram()) {
DIBuilder DB(*M, true, SP->getUnit());
Metadata *FunctionNameAnnotation[] = {
MDString::get(Ctx, "Function Name"),
MDString::get(Ctx, getPGOFuncNameVarInitializer(NamePtr)),
};
Metadata *CFGHashAnnotation[] = {
MDString::get(Ctx, "CFG Hash"),
ConstantAsMetadata::get(Inc->getHash()),
};
Metadata *NumCountersAnnotation[] = {
MDString::get(Ctx, "Num Counters"),
ConstantAsMetadata::get(Inc->getNumCounters()),
};
auto Annotations = DB.getOrCreateArray({
MDNode::get(Ctx, FunctionNameAnnotation),
MDNode::get(Ctx, CFGHashAnnotation),
MDNode::get(Ctx, NumCountersAnnotation),
});
auto *DICounter = DB.createGlobalVariableExpression(
SP, CounterPtr->getName(), /*LinkageName=*/StringRef(), SP->getFile(),
/*LineNo=*/0, DB.createUnspecifiedType("Profile Data Type"),
CounterPtr->hasLocalLinkage(), /*IsDefined=*/true, /*Expr=*/nullptr,
/*Decl=*/nullptr, /*TemplateParams=*/nullptr, /*AlignInBits=*/0,
Annotations);
CounterPtr->addDebugInfo(DICounter);
DB.finalize();
} else {
std::string Msg = ("Missing debug info for function " + Fn->getName() +
"; required for profile correlation.")
.str();
Ctx.diagnose(
DiagnosticInfoPGOProfile(M->getName().data(), Msg, DS_Warning));
}
}
auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
// Allocate statically the array of pointers to value profile nodes for
@ -996,9 +939,6 @@ InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
ConstantExpr::getBitCast(ValuesVar, Type::getInt8PtrTy(Ctx));
}
if (DebugInfoCorrelate)
return PD.RegionCounters;
// Create data variable.
auto *IntPtrTy = M->getDataLayout().getIntPtrType(M->getContext());
auto *Int16Ty = Type::getInt16Ty(Ctx);

15
llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
View File

@ -291,8 +291,6 @@ extern cl::opt<PGOViewCountsType> PGOViewCounts;
// Command line option to specify the name of the function for CFG dump
// Defined in Analysis/BlockFrequencyInfo.cpp: -view-bfi-func-name=
extern cl::opt<std::string> ViewBlockFreqFuncName;
extern cl::opt<bool> DebugInfoCorrelate;
} // namespace llvm
static cl::opt<bool>
@ -469,9 +467,8 @@ private:
createProfileFileNameVar(M, InstrProfileOutput);
// The variable in a comdat may be discarded by LTO. Ensure the
// declaration will be retained.
appendToCompilerUsed(M, createIRLevelProfileFlagVar(M, /*IsCS=*/true,
PGOInstrumentEntry,
DebugInfoCorrelate));
appendToCompilerUsed(
M, createIRLevelProfileFlagVar(M, /*IsCS=*/true, PGOInstrumentEntry));
return false;
}
std::string InstrProfileOutput;
@ -1619,8 +1616,7 @@ static bool InstrumentAllFunctions(
// For the context-sensitve instrumentation, we should have a separated pass
// (before LTO/ThinLTO linking) to create these variables.
if (!IsCS)
createIRLevelProfileFlagVar(M, /*IsCS=*/false, PGOInstrumentEntry,
DebugInfoCorrelate);
createIRLevelProfileFlagVar(M, /*IsCS=*/false, PGOInstrumentEntry);
std::unordered_multimap<Comdat *, GlobalValue *> ComdatMembers;
collectComdatMembers(M, ComdatMembers);
@ -1642,9 +1638,8 @@ PGOInstrumentationGenCreateVar::run(Module &M, ModuleAnalysisManager &AM) {
createProfileFileNameVar(M, CSInstrName);
// The variable in a comdat may be discarded by LTO. Ensure the declaration
// will be retained.
appendToCompilerUsed(M, createIRLevelProfileFlagVar(M, /*IsCS=*/true,
PGOInstrumentEntry,
DebugInfoCorrelate));
appendToCompilerUsed(
M, createIRLevelProfileFlagVar(M, /*IsCS=*/true, PGOInstrumentEntry));
return PreservedAnalyses::all();
}

74
llvm/test/Instrumentation/InstrProfiling/debug-info-correlate.ll
View File

@ -1,74 +0,0 @@
; RUN: opt < %s -instrprof -debug-info-correlate -S > %t.ll
; RUN: llc < %t.ll --filetype=asm > %t.s
; RUN: llc < %t.ll --filetype=obj > %t.o
; RUN: FileCheck < %t.ll %s
; RUN: llvm-dwarfdump %t.o | FileCheck %s --implicit-check-not "{{DW_TAG|NULL}}" --check-prefix CHECK-DWARF
; RUN: FileCheck < %t.s %s --check-prefix CHECK-ASM
target triple = "aarch64-unknown-linux-gnu"
@__profn_foo = private constant [3 x i8] c"foo"
; CHECK: @__profc_foo =
; CHECK-SAME: !dbg ![[EXPR:[0-9]+]]
; CHECK: ![[EXPR]] = !DIGlobalVariableExpression(var: ![[GLOBAL:[0-9]+]]
; CHECK: ![[GLOBAL]] = {{.*}} !DIGlobalVariable(name: "__profc_foo"
; CHECK-SAME: scope: ![[SCOPE:[0-9]+]]
; CHECK-SAME: annotations: ![[ANNOTATIONS:[0-9]+]]
; CHECK: ![[SCOPE]] = {{.*}} !DISubprogram(name: "foo"
; CHECK: ![[ANNOTATIONS]] = !{![[NAME:[0-9]+]], ![[HASH:[0-9]+]], ![[COUNTERS:[0-9]+]]}
; CHECK: ![[NAME]] = !{!"Function Name", !"foo"}
; CHECK: ![[HASH]] = !{!"CFG Hash", i64 12345678}
; CHECK: ![[COUNTERS]] = !{!"Num Counters", i32 2}
define void @_Z3foov() !dbg !12 {
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 12345678, i32 2, i32 0)
ret void
}
declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8, !9, !10}
!llvm.ident = !{!11}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 14.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "debug-info-correlate.cpp", directory: "")
!2 = !{i32 7, !"Dwarf Version", i32 4}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 1, !"branch-target-enforcement", i32 0}
!6 = !{i32 1, !"sign-return-address", i32 0}
!7 = !{i32 1, !"sign-return-address-all", i32 0}
!8 = !{i32 1, !"sign-return-address-with-bkey", i32 0}
!9 = !{i32 7, !"uwtable", i32 1}
!10 = !{i32 7, !"frame-pointer", i32 1}
!11 = !{!"clang version 14.0.0"}
!12 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !13, file: !13, line: 1, type: !14, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !16)
!13 = !DIFile(filename: "debug-info-correlate.cpp", directory: "")
!14 = !DISubroutineType(types: !15)
!15 = !{null}
!16 = !{}
; CHECK-DWARF: DW_TAG_compile_unit
; CHECK-DWARF: DW_TAG_subprogram
; CHECK-DWARF: DW_AT_name ("foo")
; CHECK-DWARF: DW_TAG_variable
; CHECK-DWARF: DW_AT_name ("__profc_foo")
; CHECK-DWARF: DW_AT_type ({{.*}} "Profile Data Type")
; CHECK-DWARF: DW_TAG_LLVM_annotation
; CHECK-DWARF: DW_AT_name ("Function Name")
; CHECK-DWARF: DW_AT_const_value ("foo")
; CHECK-DWARF: DW_TAG_LLVM_annotation
; CHECK-DWARF: DW_AT_name ("CFG Hash")
; CHECK-DWARF: DW_AT_const_value (12345678)
; CHECK-DWARF: DW_TAG_LLVM_annotation
; CHECK-DWARF: DW_AT_name ("Num Counters")
; CHECK-DWARF: DW_AT_const_value (2)
; CHECK-DWARF: NULL
; CHECK-DWARF: NULL
; CHECK-DWARF: DW_TAG_unspecified_type
; CHECK-DWARF: NULL
; CHECK-ASM-NOT: .section __llvm_prf_data
; CHECK-ASM-NOT: .section __llvm_prf_names