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[PGO] Handle and report overflow during profile merge for all types of data 

Summary: Surface counter overflow when merging profile data. Merging still occurs on overflow but counts saturate to the maximum representable value. Overflow is reported to the user.

Reviewers: davidxl, dnovillo, silvas

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D15547

llvm-svn: 255825
This commit is contained in:
Nathan Slingerland 2015-12-16 21:45:43 +00:00
parent 031bed291e
commit 48dd080c77
12 changed files with 242 additions and 99 deletions
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35
llvm/include/llvm/ProfileData/InstrProf.h
View File

@ -184,6 +184,16 @@ inline std::error_code make_error_code(instrprof_error E) {
return std::error_code(static_cast<int>(E), instrprof_category());
}
inline instrprof_error MergeResult(instrprof_error &Accumulator,
instrprof_error Result) {
// Prefer first error encountered as later errors may be secondary effects of
// the initial problem.
if (Accumulator == instrprof_error::success &&
Result != instrprof_error::success)
Accumulator = Result;
return Accumulator;
}
enum InstrProfValueKind : uint32_t {
#define VALUE_PROF_KIND(Enumerator, Value) Enumerator = Value,
#include "llvm/ProfileData/InstrProfData.inc"
@ -224,30 +234,34 @@ struct InstrProfValueSiteRecord {
/// Merge data from another InstrProfValueSiteRecord
/// Optionally scale merged counts by \p Weight.
void mergeValueData(InstrProfValueSiteRecord &Input, uint64_t Weight = 1) {
instrprof_error mergeValueData(InstrProfValueSiteRecord &Input,
uint64_t Weight = 1) {
this->sortByTargetValues();
Input.sortByTargetValues();
auto I = ValueData.begin();
auto IE = ValueData.end();
instrprof_error Result = instrprof_error::success;
for (auto J = Input.ValueData.begin(), JE = Input.ValueData.end(); J != JE;
++J) {
while (I != IE && I->Value < J->Value)
++I;
if (I != IE && I->Value == J->Value) {
// FIXME: Improve handling of counter overflow.
uint64_t JCount = J->Count;
bool Overflowed;
if (Weight > 1) {
JCount = SaturatingMultiply(JCount, Weight, &Overflowed);
assert(!Overflowed && "Value data counter overflowed!");
if (Overflowed)
Result = instrprof_error::counter_overflow;
}
I->Count = SaturatingAdd(I->Count, JCount, &Overflowed);
assert(!Overflowed && "Value data counter overflowed!");
if (Overflowed)
Result = instrprof_error::counter_overflow;
++I;
continue;
}
ValueData.insert(I, *J);
}
return Result;
}
};
@ -352,9 +366,11 @@ private:
getValueSitesForKind(ValueKind);
std::vector<InstrProfValueSiteRecord> &OtherSiteRecords =
Src.getValueSitesForKind(ValueKind);
instrprof_error Result = instrprof_error::success;
for (uint32_t I = 0; I < ThisNumValueSites; I++)
ThisSiteRecords[I].mergeValueData(OtherSiteRecords[I], Weight);
return instrprof_error::success;
MergeResult(Result, ThisSiteRecords[I].mergeValueData(OtherSiteRecords[I],
Weight));
return Result;
}
};
@ -461,11 +477,8 @@ instrprof_error InstrProfRecord::merge(InstrProfRecord &Other,
Result = instrprof_error::counter_overflow;
}
for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind) {
instrprof_error MergeValueResult = mergeValueProfData(Kind, Other, Weight);
if (MergeValueResult != instrprof_error::success)
Result = MergeValueResult;
}
for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
MergeResult(Result, mergeValueProfData(Kind, Other, Weight));
return Result;
}

93
llvm/include/llvm/ProfileData/SampleProf.h
View File

@ -38,13 +38,24 @@ enum class sampleprof_error {
unrecognized_format,
unsupported_writing_format,
truncated_name_table,
not_implemented
not_implemented,
counter_overflow
};
inline std::error_code make_error_code(sampleprof_error E) {
return std::error_code(static_cast<int>(E), sampleprof_category());
}
inline sampleprof_error MergeResult(sampleprof_error &Accumulator,
sampleprof_error Result) {
// Prefer first error encountered as later errors may be secondary effects of
// the initial problem.
if (Accumulator == sampleprof_error::success &&
Result != sampleprof_error::success)
Accumulator = Result;
return Accumulator;
}
} // end namespace llvm
namespace std {
@ -127,15 +138,18 @@ public:
///
/// Sample counts accumulate using saturating arithmetic, to avoid wrapping
/// around unsigned integers.
void addSamples(uint64_t S, uint64_t Weight = 1) {
// FIXME: Improve handling of counter overflow.
sampleprof_error addSamples(uint64_t S, uint64_t Weight = 1) {
bool Overflowed;
if (Weight > 1) {
S = SaturatingMultiply(S, Weight, &Overflowed);
assert(!Overflowed && "Sample counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
}
NumSamples = SaturatingAdd(NumSamples, S, &Overflowed);
assert(!Overflowed && "Sample counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
return sampleprof_error::success;
}
/// Add called function \p F with samples \p S.
@ -143,16 +157,20 @@ public:
///
/// Sample counts accumulate using saturating arithmetic, to avoid wrapping
/// around unsigned integers.
void addCalledTarget(StringRef F, uint64_t S, uint64_t Weight = 1) {
// FIXME: Improve handling of counter overflow.
sampleprof_error addCalledTarget(StringRef F, uint64_t S,
uint64_t Weight = 1) {
uint64_t &TargetSamples = CallTargets[F];
bool Overflowed;
if (Weight > 1) {
S = SaturatingMultiply(S, Weight, &Overflowed);
assert(!Overflowed && "Called target counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
}
TargetSamples = SaturatingAdd(TargetSamples, S, &Overflowed);
assert(!Overflowed && "Called target counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
return sampleprof_error::success;
}
/// Return true if this sample record contains function calls.
@ -163,10 +181,12 @@ public:
/// Merge the samples in \p Other into this record.
/// Optionally scale sample counts by \p Weight.
void merge(const SampleRecord &Other, uint64_t Weight = 1) {
addSamples(Other.getSamples(), Weight);
for (const auto &I : Other.getCallTargets())
addCalledTarget(I.first(), I.second, Weight);
sampleprof_error merge(const SampleRecord &Other, uint64_t Weight = 1) {
sampleprof_error Result = addSamples(Other.getSamples(), Weight);
for (const auto &I : Other.getCallTargets()) {
MergeResult(Result, addCalledTarget(I.first(), I.second, Weight));
}
return Result;
}
void print(raw_ostream &OS, unsigned Indent) const;
@ -193,35 +213,42 @@ public:
FunctionSamples() : TotalSamples(0), TotalHeadSamples(0) {}
void print(raw_ostream &OS = dbgs(), unsigned Indent = 0) const;
void dump() const;
void addTotalSamples(uint64_t Num, uint64_t Weight = 1) {
// FIXME: Improve handling of counter overflow.
sampleprof_error addTotalSamples(uint64_t Num, uint64_t Weight = 1) {
bool Overflowed;
if (Weight > 1) {
Num = SaturatingMultiply(Num, Weight, &Overflowed);
assert(!Overflowed && "Total samples counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
}
TotalSamples = SaturatingAdd(TotalSamples, Num, &Overflowed);
assert(!Overflowed && "Total samples counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
return sampleprof_error::success;
}
void addHeadSamples(uint64_t Num, uint64_t Weight = 1) {
// FIXME: Improve handling of counter overflow.
sampleprof_error addHeadSamples(uint64_t Num, uint64_t Weight = 1) {
bool Overflowed;
if (Weight > 1) {
Num = SaturatingMultiply(Num, Weight, &Overflowed);
assert(!Overflowed && "Total head samples counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
}
TotalHeadSamples = SaturatingAdd(TotalHeadSamples, Num, &Overflowed);
assert(!Overflowed && "Total head samples counter overflowed!");
if (Overflowed)
return sampleprof_error::counter_overflow;
return sampleprof_error::success;
}
void addBodySamples(uint32_t LineOffset, uint32_t Discriminator, uint64_t Num,
uint64_t Weight = 1) {
BodySamples[LineLocation(LineOffset, Discriminator)].addSamples(Num,
Weight);
sampleprof_error addBodySamples(uint32_t LineOffset, uint32_t Discriminator,
uint64_t Num, uint64_t Weight = 1) {
return BodySamples[LineLocation(LineOffset, Discriminator)].addSamples(
Num, Weight);
}
void addCalledTargetSamples(uint32_t LineOffset, uint32_t Discriminator,
sampleprof_error addCalledTargetSamples(uint32_t LineOffset,
uint32_t Discriminator,
std::string FName, uint64_t Num,
uint64_t Weight = 1) {
BodySamples[LineLocation(LineOffset, Discriminator)].addCalledTarget(
return BodySamples[LineLocation(LineOffset, Discriminator)].addCalledTarget(
FName, Num, Weight);
}
@ -272,19 +299,21 @@ public:
/// Merge the samples in \p Other into this one.
/// Optionally scale samples by \p Weight.
void merge(const FunctionSamples &Other, uint64_t Weight = 1) {
addTotalSamples(Other.getTotalSamples(), Weight);
addHeadSamples(Other.getHeadSamples(), Weight);
sampleprof_error merge(const FunctionSamples &Other, uint64_t Weight = 1) {
sampleprof_error Result = sampleprof_error::success;
MergeResult(Result, addTotalSamples(Other.getTotalSamples(), Weight));
MergeResult(Result, addHeadSamples(Other.getHeadSamples(), Weight));
for (const auto &I : Other.getBodySamples()) {
const LineLocation &Loc = I.first;
const SampleRecord &Rec = I.second;
BodySamples[Loc].merge(Rec, Weight);
MergeResult(Result, BodySamples[Loc].merge(Rec, Weight));
}
for (const auto &I : Other.getCallsiteSamples()) {
const CallsiteLocation &Loc = I.first;
const FunctionSamples &Rec = I.second;
functionSamplesAt(Loc).merge(Rec, Weight);
MergeResult(Result, functionSamplesAt(Loc).merge(Rec, Weight));
}
return Result;
}
private:

2
llvm/lib/ProfileData/SampleProf.cpp
View File

@ -45,6 +45,8 @@ class SampleProfErrorCategoryType : public std::error_category {
return "Truncated function name table";
case sampleprof_error::not_implemented:
return "Unimplemented feature";
case sampleprof_error::counter_overflow:
return "Counter overflow";
}
llvm_unreachable("A value of sampleprof_error has no message.");
}

17
llvm/lib/ProfileData/SampleProfReader.cpp
View File

@ -151,6 +151,7 @@ static bool ParseLine(const StringRef &Input, bool &IsCallsite, uint32_t &Depth,
/// \returns true if the file was loaded successfully, false otherwise.
std::error_code SampleProfileReaderText::read() {
line_iterator LineIt(*Buffer, /*SkipBlanks=*/true, '#');
sampleprof_error Result = sampleprof_error::success;
InlineCallStack InlineStack;
@ -179,8 +180,8 @@ std::error_code SampleProfileReaderText::read() {
}
Profiles[FName] = FunctionSamples();
FunctionSamples &FProfile = Profiles[FName];
FProfile.addTotalSamples(NumSamples);
FProfile.addHeadSamples(NumHeadSamples);
MergeResult(Result, FProfile.addTotalSamples(NumSamples));
MergeResult(Result, FProfile.addHeadSamples(NumHeadSamples));
InlineStack.clear();
InlineStack.push_back(&FProfile);
} else {
@ -202,7 +203,7 @@ std::error_code SampleProfileReaderText::read() {
}
FunctionSamples &FSamples = InlineStack.back()->functionSamplesAt(
CallsiteLocation(LineOffset, Discriminator, FName));
FSamples.addTotalSamples(NumSamples);
MergeResult(Result, FSamples.addTotalSamples(NumSamples));
InlineStack.push_back(&FSamples);
} else {
while (InlineStack.size() > Depth) {
@ -210,15 +211,17 @@ std::error_code SampleProfileReaderText::read() {
}
FunctionSamples &FProfile = *InlineStack.back();
for (const auto &name_count : TargetCountMap) {
FProfile.addCalledTargetSamples(LineOffset, Discriminator,
name_count.first, name_count.second);
MergeResult(Result, FProfile.addCalledTargetSamples(
LineOffset, Discriminator, name_count.first,
name_count.second));
}
FProfile.addBodySamples(LineOffset, Discriminator, NumSamples);
MergeResult(Result, FProfile.addBodySamples(LineOffset, Discriminator,
NumSamples));
}
}
}
return sampleprof_error::success;
return Result;
}
bool SampleProfileReaderText::hasFormat(const MemoryBuffer &Buffer) {

6
llvm/test/tools/llvm-profdata/Inputs/overflow-instr.proftext Normal file
View File

@ -0,0 +1,6 @@
overflow
1
3
18446744073709551615
9223372036854775808
18446744073709551615

7
llvm/test/tools/llvm-profdata/Inputs/overflow-sample.proftext Normal file
View File

@ -0,0 +1,7 @@
_Z3bari:18446744073709551615:1000
1: 18446744073709551615
_Z3fooi:18446744073709551615:1000
1: 18446744073709551615
main:1000:0
1: 500 _Z3bari:18446744073709551615
2: 500 _Z3fooi:18446744073709551615

17
llvm/test/tools/llvm-profdata/overflow-instr.test Normal file
View File

@ -0,0 +1,17 @@
Tests for overflow when merging instrumented profiles.
1- Merge profile having maximum counts with itself and verify overflow detected and saturation occurred
RUN: llvm-profdata merge -instr %p/Inputs/overflow-instr.proftext %p/Inputs/overflow-instr.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=MERGE_OVERFLOW
RUN: llvm-profdata show -instr %t.out | FileCheck %s --check-prefix=SHOW_OVERFLOW
MERGE_OVERFLOW: {{.*}}: overflow: Counter overflow
SHOW_OVERFLOW: Total functions: 1
SHOW_OVERFLOW-NEXT: Maximum function count: 18446744073709551615
SHOW_OVERFLOW-NEXT: Maximum internal block count: 18446744073709551615
2- Merge profile having maximum counts by itself and verify no overflow
RUN: llvm-profdata merge -instr %p/Inputs/overflow-instr.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=MERGE_NO_OVERFLOW -allow-empty
RUN: llvm-profdata show -instr %t.out | FileCheck %s --check-prefix=SHOW_NO_OVERFLOW
MERGE_NO_OVERFLOW-NOT: {{.*}}: overflow: Counter overflow
SHOW_NO_OVERFLOW: Total functions: 1
SHOW_NO_OVERFLOW-NEXT: Maximum function count: 18446744073709551615
SHOW_NO_OVERFLOW-NEXT: Maximum internal block count: 18446744073709551615

43
llvm/test/tools/llvm-profdata/overflow-sample.test Normal file
View File

@ -0,0 +1,43 @@
Tests for overflow when merging sampled profiles.
1- Merge profile having maximum counts with itself and verify overflow detected
RUN: llvm-profdata merge -sample %p/Inputs/overflow-sample.proftext %p/Inputs/overflow-sample.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=MERGE_OVERFLOW
RUN: llvm-profdata show -sample %t.out | FileCheck %s --check-prefix=SHOW_OVERFLOW
MERGE_OVERFLOW: {{.*}}: main: Counter overflow
SHOW_OVERFLOW: Function: main: 2000, 0, 2 sampled lines
SHOW_OVERFLOW-NEXT: Samples collected in the function's body {
SHOW_OVERFLOW-NEXT: 1: 1000, calls: _Z3bari:18446744073709551615
SHOW_OVERFLOW-NEXT: 2: 1000, calls: _Z3fooi:18446744073709551615
SHOW_OVERFLOW-NEXT: }
SHOW_OVERFLOW-NEXT: No inlined callsites in this function
SHOW_OVERFLOW-NEXT: Function: _Z3fooi: 18446744073709551615, 2000, 1 sampled lines
SHOW_OVERFLOW-NEXT: Samples collected in the function's body {
SHOW_OVERFLOW-NEXT: 1: 18446744073709551615
SHOW_OVERFLOW-NEXT: }
SHOW_OVERFLOW-NEXT: No inlined callsites in this function
SHOW_OVERFLOW-NEXT: Function: _Z3bari: 18446744073709551615, 2000, 1 sampled lines
SHOW_OVERFLOW-NEXT: Samples collected in the function's body {
SHOW_OVERFLOW-NEXT: 1: 18446744073709551615
SHOW_OVERFLOW-NEXT: }
SHOW_OVERFLOW-NEXT: No inlined callsites in this function
2- Merge profile having maximum counts by itself and verify no overflow
RUN: llvm-profdata merge -sample %p/Inputs/overflow-sample.proftext -o %t.out 2>&1 | FileCheck %s -allow-empty -check-prefix=MERGE_NO_OVERFLOW
RUN: llvm-profdata show -sample %t.out | FileCheck %s --check-prefix=SHOW_NO_OVERFLOW
MERGE_NO_OVERFLOW-NOT: {{.*}}: main: Counter overflow
SHOW_NO_OVERFLOW: Function: main: 1000, 0, 2 sampled lines
SHOW_NO_OVERFLOW-NEXT: Samples collected in the function's body {
SHOW_NO_OVERFLOW-NEXT: 1: 500, calls: _Z3bari:18446744073709551615
SHOW_NO_OVERFLOW-NEXT: 2: 500, calls: _Z3fooi:18446744073709551615
SHOW_NO_OVERFLOW-NEXT: }
SHOW_NO_OVERFLOW-NEXT: No inlined callsites in this function
SHOW_NO_OVERFLOW-NEXT: Function: _Z3fooi: 18446744073709551615, 1000, 1 sampled lines
SHOW_NO_OVERFLOW-NEXT: Samples collected in the function's body {
SHOW_NO_OVERFLOW-NEXT: 1: 18446744073709551615
SHOW_NO_OVERFLOW-NEXT: }
SHOW_NO_OVERFLOW-NEXT: No inlined callsites in this function
SHOW_NO_OVERFLOW-NEXT: Function: _Z3bari: 18446744073709551615, 1000, 1 sampled lines
SHOW_NO_OVERFLOW-NEXT: Samples collected in the function's body {
SHOW_NO_OVERFLOW-NEXT: 1: 18446744073709551615
SHOW_NO_OVERFLOW-NEXT: }
SHOW_NO_OVERFLOW-NEXT: No inlined callsites in this function

20
llvm/test/tools/llvm-profdata/overflow.proftext
View File

@ -1,20 +0,0 @@
# RUN: llvm-profdata merge %s -o %t.out 2>&1 | FileCheck %s --check-prefix=MERGE
# RUN: llvm-profdata show %t.out | FileCheck %s --check-prefix=SHOW
# MERGE: overflow.proftext: overflow: Counter overflow
# SHOW: Total functions: 1
# SHOW: Maximum function count: 18446744073709551615
# SHOW: Maximum internal block count: 18446744073709551615
overflow
1
3
18446744073709551615
9223372036854775808
18446744073709551615
overflow
1
3
9223372036854775808
9223372036854775808
0

6
llvm/tools/llvm-profdata/llvm-profdata.cpp
View File

@ -180,7 +180,11 @@ static void mergeSampleProfile(const WeightedFileVector &Inputs,
I != E; ++I) {
StringRef FName = I->first();
FunctionSamples &Samples = I->second;
ProfileMap[FName].merge(Samples, Input.Weight);
sampleprof_error Result = ProfileMap[FName].merge(Samples, Input.Weight);
if (Result != sampleprof_error::success) {
std::error_code EC = make_error_code(Result);
handleMergeWriterError(EC, Input.Filename, FName);
}
}
}
Writer->write(ProfileMap);

59
llvm/unittests/ProfileData/InstrProfTest.cpp
View File

@ -353,41 +353,50 @@ TEST_F(InstrProfTest, get_icall_data_merge1) {
TEST_F(InstrProfTest, get_icall_data_merge1_saturation) {
const uint64_t Max = std::numeric_limits<uint64_t>::max();
InstrProfRecord Record1("caller", 0x1234, {1});
InstrProfRecord Record2("caller", 0x1234, {Max});
InstrProfRecord Record3("callee1", 0x1235, {3, 4});
InstrProfRecord Record1("foo", 0x1234, {1});
auto Result1 = Writer.addRecord(std::move(Record1));
ASSERT_EQ(Result1, instrprof_error::success);
Record1.reserveSites(IPVK_IndirectCallTarget, 1);
InstrProfValueData VD1[] = {{(uint64_t) "callee1", 1}};
Record1.addValueData(IPVK_IndirectCallTarget, 0, VD1, 1, nullptr);
// Verify counter overflow.
InstrProfRecord Record2("foo", 0x1234, {Max});
auto Result2 = Writer.addRecord(std::move(Record2));
ASSERT_EQ(Result2, instrprof_error::counter_overflow);
Record2.reserveSites(IPVK_IndirectCallTarget, 1);
// FIXME: Improve handling of counter overflow. ValueData asserts on overflow.
// InstrProfValueData VD2[] = {{(uint64_t) "callee1", Max}};
InstrProfValueData VD2[] = {{(uint64_t) "callee1", 1}};
Record2.addValueData(IPVK_IndirectCallTarget, 0, VD2, 1, nullptr);
InstrProfRecord Record3("bar", 0x9012, {8});
auto Result3 = Writer.addRecord(std::move(Record3));
ASSERT_EQ(Result3, instrprof_error::success);
Writer.addRecord(std::move(Record1));
Writer.addRecord(std::move(Record2));
Writer.addRecord(std::move(Record3));
InstrProfRecord Record4("baz", 0x5678, {3, 4});
Record4.reserveSites(IPVK_IndirectCallTarget, 1);
InstrProfValueData VD4[] = {{(uint64_t) "bar", 1}};
Record4.addValueData(IPVK_IndirectCallTarget, 0, VD4, 1, nullptr);
auto Result4 = Writer.addRecord(std::move(Record4));
ASSERT_EQ(Result4, instrprof_error::success);
// Verify value data counter overflow.
InstrProfRecord Record5("baz", 0x5678, {5, 6});
Record5.reserveSites(IPVK_IndirectCallTarget, 1);
InstrProfValueData VD5[] = {{(uint64_t) "bar", Max}};
Record5.addValueData(IPVK_IndirectCallTarget, 0, VD5, 1, nullptr);
auto Result5 = Writer.addRecord(std::move(Record5));
ASSERT_EQ(Result5, instrprof_error::counter_overflow);
auto Profile = Writer.writeBuffer();
readProfile(std::move(Profile));
// Verify saturation of counts.
ErrorOr<InstrProfRecord> R = Reader->getInstrProfRecord("caller", 0x1234);
ASSERT_TRUE(NoError(R.getError()));
ErrorOr<InstrProfRecord> ReadRecord1 =
Reader->getInstrProfRecord("foo", 0x1234);
ASSERT_TRUE(NoError(ReadRecord1.getError()));
ASSERT_EQ(Max, ReadRecord1.get().Counts[0]);
ASSERT_EQ(Max, R.get().Counts[0]);
ASSERT_EQ(1U, R.get().getNumValueSites(IPVK_IndirectCallTarget));
ErrorOr<InstrProfRecord> ReadRecord2 =
Reader->getInstrProfRecord("baz", 0x5678);
ASSERT_EQ(1U, ReadRecord2.get().getNumValueSites(IPVK_IndirectCallTarget));
std::unique_ptr<InstrProfValueData[]> VD =
R.get().getValueForSite(IPVK_IndirectCallTarget, 0);
ASSERT_EQ(StringRef("callee1"), StringRef((const char *)VD[0].Value, 7));
// FIXME: Improve handling of counter overflow. ValueData asserts on overflow.
// ASSERT_EQ(Max, VD[0].Count);
ASSERT_EQ(2U, VD[0].Count);
ReadRecord2.get().getValueForSite(IPVK_IndirectCallTarget, 0);
ASSERT_EQ(StringRef("bar"), StringRef((const char *)VD[0].Value, 3));
ASSERT_EQ(Max, VD[0].Count);
}
// Synthesize runtime value profile data.

30
llvm/unittests/ProfileData/SampleProfTest.cpp
View File

@ -99,4 +99,34 @@ TEST_F(SampleProfTest, roundtrip_binary_profile) {
testRoundTrip(SampleProfileFormat::SPF_Binary);
}
TEST_F(SampleProfTest, sample_overflow_saturation) {
const uint64_t Max = std::numeric_limits<uint64_t>::max();
sampleprof_error Result;
StringRef FooName("_Z3fooi");
FunctionSamples FooSamples;
Result = FooSamples.addTotalSamples(1);
ASSERT_EQ(Result, sampleprof_error::success);
Result = FooSamples.addHeadSamples(1);
ASSERT_EQ(Result, sampleprof_error::success);
Result = FooSamples.addBodySamples(10, 0, 1);
ASSERT_EQ(Result, sampleprof_error::success);
Result = FooSamples.addTotalSamples(Max);
ASSERT_EQ(Result, sampleprof_error::counter_overflow);
ASSERT_EQ(FooSamples.getTotalSamples(), Max);
Result = FooSamples.addHeadSamples(Max);
ASSERT_EQ(Result, sampleprof_error::counter_overflow);
ASSERT_EQ(FooSamples.getHeadSamples(), Max);
Result = FooSamples.addBodySamples(10, 0, Max);
ASSERT_EQ(Result, sampleprof_error::counter_overflow);
ErrorOr<uint64_t> BodySamples = FooSamples.findSamplesAt(10, 0);
ASSERT_FALSE(BodySamples.getError());
ASSERT_EQ(BodySamples.get(), Max);
}
} // end anonymous namespace