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Automated rollback of commit adb2c4b.
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PiperOrigin-RevId: 548128917
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@protobuf-github-bot @copybara-github
protobuf-github-bot authored and copybara-github committed Jul 14, 2023
1 parent 6098c02 commit 0ea0052
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Showing 3 changed files with 74 additions and 187 deletions.
217 changes: 74 additions & 143 deletions src/google/protobuf/generated_message_tctable_lite.cc
View file
Original file line number Diff line number Diff line change
Expand Up @@ -393,45 +393,6 @@ inline PROTOBUF_ALWAYS_INLINE void InvertPacked(TcFieldData& data) {
data.data ^= Wt ^ WireFormatLite::WIRETYPE_LENGTH_DELIMITED;
}

constexpr uint32_t kAccumulatorBytesOnStack = 256;

// Accumulates fields to buffer repeated fields on parsing path to avoid growing
// repeated field container type too frequently. It flushes to the backing
// repeated fields if it's full or out of the scope. A larger buffer (e.g. 2KiB)
// is actually harmful due to:
// - increased stack overflow risk
// - extra cache misses on accessing local variables
// - less competitive to the cost of growing large buffer
template <typename ElementType, typename ContainerType>
class ScopedFieldAccumulator {
public:
constexpr explicit ScopedFieldAccumulator(ContainerType& field)
: field_(field) {}

~ScopedFieldAccumulator() {
if (ABSL_PREDICT_TRUE(current_size_ > 0)) {
field_.MergeFromArray(buffer_, current_size_);
}
}

PROTOBUF_NODISCARD ElementType& Next() {
if (ABSL_PREDICT_FALSE(current_size_ == kSize)) {
field_.MergeFromArray(buffer_, kSize);
current_size_ = 0;
}
return buffer_[current_size_++];
}

private:
static constexpr uint32_t kSize =
kAccumulatorBytesOnStack / sizeof(ElementType);
static_assert(kSize > 0, "Size cannot be zero");

uint32_t current_size_ = 0;
ElementType buffer_[kSize];
ContainerType& field_;
};

} // namespace

//////////////////////////////////////////////////////////////////////////////
Expand Down Expand Up @@ -659,17 +620,14 @@ PROTOBUF_ALWAYS_INLINE const char* TcParser::RepeatedFixed(
}
auto& field = RefAt<RepeatedField<LayoutType>>(msg, data.offset());
const auto tag = UnalignedLoad<TagType>(ptr);
{
ScopedFieldAccumulator<LayoutType, decltype(field)> accumulator(field);
do {
accumulator.Next() = UnalignedLoad<LayoutType>(ptr + sizeof(TagType));
ptr += sizeof(TagType) + sizeof(LayoutType);
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
} while (UnalignedLoad<TagType>(ptr) == tag);
}
do {
field.Add(UnalignedLoad<LayoutType>(ptr + sizeof(TagType)));
ptr += sizeof(TagType) + sizeof(LayoutType);
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) {
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}
} while (UnalignedLoad<TagType>(ptr) == tag);
PROTOBUF_MUSTTAIL return ToTagDispatch(PROTOBUF_TC_PARAM_NO_DATA_PASS);
parse_loop:
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}

PROTOBUF_NOINLINE const char* TcParser::FastF32R1(PROTOBUF_TC_PARAM_DECL) {
Expand Down Expand Up @@ -1003,22 +961,19 @@ PROTOBUF_ALWAYS_INLINE const char* TcParser::RepeatedVarint(
}
auto& field = RefAt<RepeatedField<FieldType>>(msg, data.offset());
const auto expected_tag = UnalignedLoad<TagType>(ptr);
{
ScopedFieldAccumulator<FieldType, decltype(field)> accumulator(field);
do {
ptr += sizeof(TagType);
FieldType tmp;
ptr = ParseVarint(ptr, &tmp);
if (PROTOBUF_PREDICT_FALSE(ptr == nullptr)) goto error;
accumulator.Next() = ZigZagDecodeHelper<FieldType, zigzag>(tmp);
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
} while (UnalignedLoad<TagType>(ptr) == expected_tag);
}
do {
ptr += sizeof(TagType);
FieldType tmp;
ptr = ParseVarint(ptr, &tmp);
if (PROTOBUF_PREDICT_FALSE(ptr == nullptr)) {
PROTOBUF_MUSTTAIL return Error(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}
field.Add(ZigZagDecodeHelper<FieldType, zigzag>(tmp));
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) {
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}
} while (UnalignedLoad<TagType>(ptr) == expected_tag);
PROTOBUF_MUSTTAIL return ToTagDispatch(PROTOBUF_TC_PARAM_NO_DATA_PASS);
parse_loop:
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
error:
PROTOBUF_MUSTTAIL return Error(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}

PROTOBUF_NOINLINE const char* TcParser::FastV8R1(PROTOBUF_TC_PARAM_DECL) {
Expand Down Expand Up @@ -1080,8 +1035,7 @@ const char* TcParser::PackedVarint(PROTOBUF_TC_PARAM_DECL) {
// pending hasbits now:
SyncHasbits(msg, hasbits, table);
auto* field = &RefAt<RepeatedField<FieldType>>(msg, data.offset());
ScopedFieldAccumulator<FieldType, decltype(*field)> accumulator(*field);
return ctx->ReadPackedVarint(ptr, [&](uint64_t varint) {
return ctx->ReadPackedVarint(ptr, [field](uint64_t varint) {
FieldType val;
if (zigzag) {
if (sizeof(FieldType) == 8) {
Expand All @@ -1092,7 +1046,7 @@ const char* TcParser::PackedVarint(PROTOBUF_TC_PARAM_DECL) {
} else {
val = varint;
}
accumulator.Next() = val;
field->Add(val);
});
}

Expand Down Expand Up @@ -1227,33 +1181,28 @@ const char* TcParser::RepeatedEnum(PROTOBUF_TC_PARAM_DECL) {
auto& field = RefAt<RepeatedField<int32_t>>(msg, data.offset());
const auto expected_tag = UnalignedLoad<TagType>(ptr);
const TcParseTableBase::FieldAux aux = *table->field_aux(data.aux_idx());
{
ScopedFieldAccumulator<int32_t, decltype(field)> accumulator(field);
do {
const char* ptr2 = ptr; // save for unknown enum case
ptr += sizeof(TagType);
uint64_t tmp;
ptr = ParseVarint(ptr, &tmp);
if (PROTOBUF_PREDICT_FALSE(ptr == nullptr)) goto error;
if (PROTOBUF_PREDICT_FALSE(
!EnumIsValidAux(static_cast<int32_t>(tmp), xform_val, aux))) {
// We can avoid duplicate work in MiniParse by directly calling
// table->fallback.
ptr = ptr2;
goto unknown_enum_fallback;
}
accumulator.Next() = static_cast<int32_t>(tmp);
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
} while (UnalignedLoad<TagType>(ptr) == expected_tag);
}
do {
const char* ptr2 = ptr; // save for unknown enum case
ptr += sizeof(TagType);
uint64_t tmp;
ptr = ParseVarint(ptr, &tmp);
if (PROTOBUF_PREDICT_FALSE(ptr == nullptr)) {
PROTOBUF_MUSTTAIL return Error(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}
if (PROTOBUF_PREDICT_FALSE(
!EnumIsValidAux(static_cast<int32_t>(tmp), xform_val, aux))) {
// We can avoid duplicate work in MiniParse by directly calling
// table->fallback.
ptr = ptr2;
PROTOBUF_MUSTTAIL return FastUnknownEnumFallback(PROTOBUF_TC_PARAM_PASS);
}
field.Add(static_cast<int32_t>(tmp));
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) {
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}
} while (UnalignedLoad<TagType>(ptr) == expected_tag);

PROTOBUF_MUSTTAIL return ToTagDispatch(PROTOBUF_TC_PARAM_NO_DATA_PASS);
parse_loop:
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
error:
PROTOBUF_MUSTTAIL return Error(PROTOBUF_TC_PARAM_NO_DATA_PASS);
unknown_enum_fallback:
PROTOBUF_MUSTTAIL return FastUnknownEnumFallback(PROTOBUF_TC_PARAM_PASS);
}

const TcParser::UnknownFieldOps& TcParser::GetUnknownFieldOps(
Expand Down Expand Up @@ -1387,22 +1336,19 @@ const char* TcParser::RepeatedEnumSmallRange(PROTOBUF_TC_PARAM_DECL) {
auto& field = RefAt<RepeatedField<int32_t>>(msg, data.offset());
auto expected_tag = UnalignedLoad<TagType>(ptr);
const uint8_t max = data.aux_idx();
{
ScopedFieldAccumulator<int32_t, decltype(field)> accumulator(field);
do {
uint8_t v = ptr[sizeof(TagType)];
if (PROTOBUF_PREDICT_FALSE(min > v || v > max)) goto mini_parse;
accumulator.Next() = static_cast<int32_t>(v);
ptr += sizeof(TagType) + 1;
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
} while (UnalignedLoad<TagType>(ptr) == expected_tag);
}
do {
uint8_t v = ptr[sizeof(TagType)];
if (PROTOBUF_PREDICT_FALSE(min > v || v > max)) {
PROTOBUF_MUSTTAIL return MiniParse(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}
field.Add(static_cast<int32_t>(v));
ptr += sizeof(TagType) + 1;
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) {
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}
} while (UnalignedLoad<TagType>(ptr) == expected_tag);

PROTOBUF_MUSTTAIL return ToTagDispatch(PROTOBUF_TC_PARAM_NO_DATA_PASS);
parse_loop:
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
mini_parse:
PROTOBUF_MUSTTAIL return MiniParse(PROTOBUF_TC_PARAM_NO_DATA_PASS);
}

PROTOBUF_NOINLINE const char* TcParser::FastEr0R1(PROTOBUF_TC_PARAM_DECL) {
Expand Down Expand Up @@ -1904,10 +1850,9 @@ PROTOBUF_NOINLINE const char* TcParser::MpRepeatedFixed(
constexpr auto size = sizeof(uint64_t);
const char* ptr2 = ptr;
uint32_t next_tag;
ScopedFieldAccumulator<uint64_t, decltype(field)> accumulator(field);
do {
ptr = ptr2;
accumulator.Next() = UnalignedLoad<uint64_t>(ptr);
*field.Add() = UnalignedLoad<uint64_t>(ptr);
ptr += size;
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
ptr2 = ReadTag(ptr, &next_tag);
Expand All @@ -1922,10 +1867,9 @@ PROTOBUF_NOINLINE const char* TcParser::MpRepeatedFixed(
constexpr auto size = sizeof(uint32_t);
const char* ptr2 = ptr;
uint32_t next_tag;
ScopedFieldAccumulator<uint32_t, decltype(field)> accumulator(field);
do {
ptr = ptr2;
accumulator.Next() = UnalignedLoad<uint32_t>(ptr);
*field.Add() = UnalignedLoad<uint32_t>(ptr);
ptr += size;
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
ptr2 = ReadTag(ptr, &next_tag);
Expand Down Expand Up @@ -2055,13 +1999,11 @@ PROTOBUF_NOINLINE const char* TcParser::MpRepeatedVarint(
auto& field = RefAt<RepeatedField<uint64_t>>(msg, entry.offset);
const char* ptr2 = ptr;
uint32_t next_tag;
ScopedFieldAccumulator<uint64_t, decltype(field)> accumulator(field);
do {
uint64_t tmp;
ptr = ParseVarint(ptr2, &tmp);
if (PROTOBUF_PREDICT_FALSE(ptr == nullptr)) goto error;
accumulator.Next() =
is_zigzag ? WireFormatLite::ZigZagDecode64(tmp) : tmp;
field.Add(is_zigzag ? WireFormatLite::ZigZagDecode64(tmp) : tmp);
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
ptr2 = ReadTag(ptr, &next_tag);
if (PROTOBUF_PREDICT_FALSE(ptr2 == nullptr)) goto error;
Expand All @@ -2070,20 +2012,20 @@ PROTOBUF_NOINLINE const char* TcParser::MpRepeatedVarint(
auto& field = RefAt<RepeatedField<uint32_t>>(msg, entry.offset);
const char* ptr2 = ptr;
uint32_t next_tag;
ScopedFieldAccumulator<uint32_t, decltype(field)> accumulator(field);
do {
uint64_t tmp;
ptr = ParseVarint(ptr2, &tmp);
if (PROTOBUF_PREDICT_FALSE(ptr == nullptr)) goto error;
if (is_validated_enum) {
if (!EnumIsValidAux(tmp, xform_val, *table->field_aux(&entry))) {
ptr = ptr2;
goto unknown_enum_fallback;
PROTOBUF_MUSTTAIL return MpUnknownEnumFallback(
PROTOBUF_TC_PARAM_PASS);
}
} else if (is_zigzag) {
tmp = WireFormatLite::ZigZagDecode32(tmp);
}
accumulator.Next() = tmp;
field.Add(tmp);
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
ptr2 = ReadTag(ptr, &next_tag);
if (PROTOBUF_PREDICT_FALSE(ptr2 == nullptr)) goto error;
Expand All @@ -2093,12 +2035,11 @@ PROTOBUF_NOINLINE const char* TcParser::MpRepeatedVarint(
auto& field = RefAt<RepeatedField<bool>>(msg, entry.offset);
const char* ptr2 = ptr;
uint32_t next_tag;
ScopedFieldAccumulator<bool, decltype(field)> accumulator(field);
do {
uint64_t tmp;
ptr = ParseVarint(ptr2, &tmp);
if (PROTOBUF_PREDICT_FALSE(ptr == nullptr)) goto error;
accumulator.Next() = static_cast<bool>(tmp);
field.Add(static_cast<bool>(tmp));
if (PROTOBUF_PREDICT_FALSE(!ctx->DataAvailable(ptr))) goto parse_loop;
ptr2 = ReadTag(ptr, &next_tag);
if (PROTOBUF_PREDICT_FALSE(ptr2 == nullptr)) goto error;
Expand All @@ -2110,8 +2051,6 @@ PROTOBUF_NOINLINE const char* TcParser::MpRepeatedVarint(
PROTOBUF_MUSTTAIL return ToParseLoop(PROTOBUF_TC_PARAM_NO_DATA_PASS);
error:
PROTOBUF_MUSTTAIL return Error(PROTOBUF_TC_PARAM_NO_DATA_PASS);
unknown_enum_fallback:
PROTOBUF_MUSTTAIL return MpUnknownEnumFallback(PROTOBUF_TC_PARAM_PASS);
}

PROTOBUF_NOINLINE const char* TcParser::MpPackedVarint(PROTOBUF_TC_PARAM_DECL) {
Expand All @@ -2133,41 +2072,33 @@ PROTOBUF_NOINLINE const char* TcParser::MpPackedVarint(PROTOBUF_TC_PARAM_DECL) {

uint16_t rep = type_card & field_layout::kRepMask;
if (rep == field_layout::kRep64Bits) {
auto& field = RefAt<RepeatedField<uint64_t>>(msg, entry.offset);
ScopedFieldAccumulator<uint64_t, decltype(field)> accumulator(field);
return ctx->ReadPackedVarint(
ptr, [&accumulator, is_zigzag](uint64_t value) {
accumulator.Next() =
is_zigzag ? WireFormatLite::ZigZagDecode64(value) : value;
});
auto* field = &RefAt<RepeatedField<uint64_t>>(msg, entry.offset);
return ctx->ReadPackedVarint(ptr, [field, is_zigzag](uint64_t value) {
field->Add(is_zigzag ? WireFormatLite::ZigZagDecode64(value) : value);
});
} else if (rep == field_layout::kRep32Bits) {
auto& field = RefAt<RepeatedField<uint32_t>>(msg, entry.offset);
auto* field = &RefAt<RepeatedField<uint32_t>>(msg, entry.offset);
if (is_validated_enum) {
const TcParseTableBase::FieldAux aux = *table->field_aux(entry.aux_idx);
ScopedFieldAccumulator<uint32_t, decltype(field)> accumulator(field);
return ctx->ReadPackedVarint(ptr, [=, &accumulator](int32_t value) {
return ctx->ReadPackedVarint(ptr, [=](int32_t value) {
if (!EnumIsValidAux(value, xform_val, aux)) {
AddUnknownEnum(msg, table, data.tag(), value);
} else {
accumulator.Next() = value;
field->Add(value);
}
});
} else {
ScopedFieldAccumulator<uint32_t, decltype(field)> accumulator(field);
return ctx->ReadPackedVarint(
ptr, [&accumulator, is_zigzag](uint64_t value) {
accumulator.Next() = is_zigzag ? WireFormatLite::ZigZagDecode32(
static_cast<uint32_t>(value))
: value;
});
return ctx->ReadPackedVarint(ptr, [field, is_zigzag](uint64_t value) {
field->Add(is_zigzag ? WireFormatLite::ZigZagDecode32(
static_cast<uint32_t>(value))
: value);
});
}
} else {
ABSL_DCHECK_EQ(rep, static_cast<uint16_t>(field_layout::kRep8Bits));
auto& field = RefAt<RepeatedField<bool>>(msg, entry.offset);
ScopedFieldAccumulator<bool, decltype(field)> accumulator(field);
return ctx->ReadPackedVarint(ptr, [&](uint64_t value) {
accumulator.Next() = static_cast<bool>(value);
});
auto* field = &RefAt<RepeatedField<bool>>(msg, entry.offset);
return ctx->ReadPackedVarint(
ptr, [field](uint64_t value) { field->Add(static_cast<bool>(value)); });
}

PROTOBUF_MUSTTAIL return Error(PROTOBUF_TC_PARAM_NO_DATA_PASS);
Expand Down
26 changes: 0 additions & 26 deletions src/google/protobuf/repeated_field.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -358,8 +358,6 @@ class RepeatedField final
// This is public due to it being called by generated code.
inline void InternalSwap(RepeatedField* other);

void MergeFromArray(const Element* array, size_t length);

private:
RepeatedField(Arena* arena, const RepeatedField& rhs);
template <typename T> friend class Arena::InternalHelper;
Expand Down Expand Up @@ -624,30 +622,6 @@ inline int RepeatedField<Element>::Capacity() const {
return total_size_;
}

template <typename Element>
inline void RepeatedField<Element>::MergeFromArray(const Element* array,
size_t length) {
// Only supports trivially copyable types.
static_assert(std::is_trivially_copyable<Element>::value,
"only trivialy copyable types are supported");

ABSL_DCHECK_GT(length, 0u);
if (ABSL_PREDICT_TRUE(current_size_ + static_cast<int>(length) >
total_size_)) {
Grow(current_size_, current_size_ + length);
}
Element* elem = unsafe_elements();
ABSL_DCHECK_NE(elem, nullptr);
void* p = elem + ExchangeCurrentSize(current_size_ + length);
memcpy(p, array, sizeof(Element) * length);
}

template <>
inline void RepeatedField<absl::Cord>::MergeFromArray(const absl::Cord* array,
size_t length) {
ABSL_LOG(FATAL) << "not supported";
}

template <typename Element>
inline void RepeatedField<Element>::AddAlreadyReserved(Element value) {
ABSL_DCHECK_LT(current_size_, total_size_);
Expand Down
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