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source_range_serialization.cpp
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source_range_serialization.cpp
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#include <torch/csrc/jit/serialization/source_range_serialization.h>
#include <torch/csrc/jit/serialization/source_range_serialization_impl.h>
#include <c10/util/Exception.h>
#include <c10/util/Flags.h>
#include <torch/csrc/jit/mobile/type_parser.h>
#include <torch/csrc/jit/serialization/pickle.h>
#include <algorithm>
namespace torch {
namespace jit {
// "Whether to emit compact debug_pkl when saving a model to .pt file."
// "Compact file is smaller but cannot be loaded by old torch binaries."
// TODO(qihan) remove when all binaries are using string table.
thread_local bool should_use_format_with_string_table_ = true;
class SourceRangeSerializer {
public:
// Serialize SourceRange as Tuple[SourceType, int, int]
// where SourceType = Tuple[int, int, int, List[int]],
// The first 2 ints are positions into the vector returned by textSaved
// after all the Ranges are processed. textSaved() returns a vector of str
// the serialized form of Source
c10::IValue serialize(const SourceRange& sr);
const std::vector<c10::IValue>& texts_saved() {
return texts_;
}
SourceRangeSerializer() {
texts_.emplace_back("");
text_to_idx_[texts_.back().toStringRef()] = 0;
}
private:
// Serialize Source as Tuple[str, Optional[str], int, List[int]]
// This caches serialized sources, since many SourceRanges can
// refer to the same one.
c10::IValue serialize_source(const std::shared_ptr<Source>& s);
std::unordered_map<std::shared_ptr<Source>, c10::IValue> serialized_sources;
int64_t store_text_and_get_index(const std::string& text_view);
std::vector<c10::IValue> texts_;
std::unordered_map<c10::string_view, int64_t> text_to_idx_;
};
SourceRange SourceRangeDeserializer::deserialize(const c10::IValue& iv) {
const auto& tup_elems = iv.toTupleRef().elements();
TORCH_INTERNAL_ASSERT(tup_elems.size() == 3);
std::shared_ptr<Source> source_ = deserialize_source(tup_elems[0]);
int64_t start_ = tup_elems[1].toInt();
int64_t end_ = tup_elems[2].toInt();
return SourceRange(source_, start_, end_);
}
std::shared_ptr<Source> SourceRangeDeserializer::deserialize_source(
const c10::IValue& iv) {
auto tup = iv.toTuple();
auto it = cached_sources.find(tup);
if (it != cached_sources.end()) {
return it->second;
}
std::shared_ptr<Source> source;
const auto& tup_elems = tup->elements();
TORCH_INTERNAL_ASSERT(tup_elems.size() == 3);
if (!text_table_.empty()) {
const auto& textIndex = tup_elems[0].toIntList();
int64_t fnameIndex = tup_elems[1].toInt();
int64_t starting_line_no_ = tup_elems[2].toInt();
c10::optional<std::string> filename = c10::nullopt;
filename = *text_table_[fnameIndex];
std::vector<c10::string_view> pieces;
std::vector<std::shared_ptr<std::string>> strs;
for (int64_t i : textIndex) {
pieces.emplace_back(*text_table_[i]);
strs.emplace_back(text_table_[i]);
}
StringCordView str_cord(std::move(pieces), std::move(strs));
source = std::make_shared<Source>(str_cord, filename, starting_line_no_);
} else {
std::string text_ = tup_elems[0].toStringRef();
c10::optional<std::string> filename_ =
tup_elems[1].toOptional<std::string>();
int64_t starting_line_no_ = tup_elems[2].toInt();
source = std::make_shared<Source>(
std::move(text_), std::move(filename_), starting_line_no_);
}
cached_sources[tup] = source;
return source;
}
c10::IValue SourceRangeSerializer::serialize(const SourceRange& sr) {
return c10::ivalue::Tuple::create(
serialize_source(sr.source()), (int64_t)sr.start(), (int64_t)sr.end());
}
int64_t SourceRangeSerializer::store_text_and_get_index(
const std::string& text_view) {
auto text_iter = text_to_idx_.find(text_view);
if (text_iter == text_to_idx_.end()) {
int64_t text_pos = static_cast<int64_t>(texts_.size());
texts_.emplace_back(text_view);
text_to_idx_[texts_.back().toStringView()] = text_pos;
return text_pos;
} else {
return text_iter->second;
}
}
c10::IValue SourceRangeSerializer::serialize_source(
const std::shared_ptr<Source>& s) {
if (serialized_sources.count(s)) {
return serialized_sources.at(s);
}
c10::intrusive_ptr<c10::ivalue::Tuple> serialized;
c10::List<int64_t> lines;
if (should_use_format_with_string_table_) {
if (s == nullptr) {
serialized = c10::ivalue::Tuple::create({lines, 0, 0});
} else {
for (size_t lineno = 0; lineno < s->num_lines(); lineno++) {
std::string line_content = s->get_line(lineno).str();
int64_t text_pos = store_text_and_get_index(line_content);
lines.push_back(text_pos);
}
int64_t fname_pos = 0;
if (s->filename().has_value()) {
fname_pos = store_text_and_get_index(*s->filename());
}
serialized = c10::ivalue::Tuple::create(
{lines, fname_pos, (int64_t)s->starting_line_no()});
}
} else {
if (s == nullptr) {
serialized = c10::ivalue::Tuple::create({"", "", 0});
} else {
serialized = c10::ivalue::Tuple::create(
{s->text_str().str(), s->filename(), (int64_t)s->starting_line_no()});
}
}
serialized_sources[s] = serialized;
return serialized;
}
SourceRangePickler::SourceRangePickler() : srs(new SourceRangeSerializer()) {}
std::vector<char> SourceRangePickler::pickle(
const SourceRangeRecords& ranges,
const SourceRangeTagMap& source_range_tags) {
std::vector<c10::IValue> ivalues;
for (const auto& range : ranges) {
int64_t source_range_tag{-1};
const auto& it = source_range_tags.find(range.range);
if (it != source_range_tags.end()) {
source_range_tag = it->second;
}
ivalues.emplace_back(c10::ivalue::Tuple::create(
{(int64_t)range.bytes,
srs->serialize(range.range),
static_cast<int64_t>(source_range_tag)}));
}
std::vector<at::Tensor> table;
auto textTable = c10::ivalue::Tuple::create(srs->texts_saved());
auto ivalue = c10::ivalue::Tuple::create(std::move(ivalues));
std::vector<char> result;
if (should_use_format_with_string_table_) {
result = jit::pickle(
c10::ivalue::Tuple::create({kFormatWithStringTable, textTable, ivalue}),
&table);
} else {
result = jit::pickle(ivalue, &table);
}
TORCH_CHECK(table.size() == 0, "Expected 0 tensors to be written");
return result;
}
ConcreteSourceRangeUnpickler::ConcreteSourceRangeUnpickler(
at::DataPtr&& data,
size_t size)
: data(std::move(data)),
size(size),
deserializer(nullptr),
unpickled_records(nullptr) {}
void ConcreteSourceRangeUnpickler::unpickle() {
std::lock_guard<std::mutex> guard(mutex);
if (unpickled_records) {
return;
}
auto ivaluesTuple = jit::unpickle(
reinterpret_cast<const char*>(data.get()),
size,
nullptr,
{},
c10::parseType)
.toTuple();
const auto& ivalues = ivaluesTuple->elements();
unpickled_records = std::make_shared<SourceRangeRecords>();
IValue lines;
if (ivalues[0].isString() &&
kFormatWithStringTable == ivalues[0].toStringRef()) {
deserializer.reset(new SourceRangeDeserializer(ivalues[1]));
lines = ivalues[2];
} else {
deserializer.reset(new SourceRangeDeserializer());
lines = ivaluesTuple;
}
for (auto& val : lines.toTuple()->elements()) {
const auto& tup_elems = val.toTupleRef().elements();
int64_t offset = tup_elems[kByteOffsetIndex].toInt();
auto source_range = deserializer->deserialize(tup_elems[kSourceRangeIndex]);
unpickled_records->emplace_back(offset, std::move(source_range));
}
}
c10::optional<SourceRange> ConcreteSourceRangeUnpickler::
findSourceRangeThatGenerated(const SourceRange& range) {
unpickle();
auto query = TaggedRange(range.start(), SourceRange{});
auto entry = std::upper_bound(
unpickled_records->begin(),
unpickled_records->end(),
query,
[](const TaggedRange& a, const TaggedRange& b) -> bool {
return a.bytes < b.bytes;
});
// NB: must decrement iterator since upper_bound finds the element
// *greater than* the query.
if (entry != unpickled_records->begin()) {
return (entry - 1)->range;
}
return c10::nullopt;
}
TORCH_API void setShouldUseFormatWithStringTable(
bool should_use_format_with_string_table) {
should_use_format_with_string_table_ = should_use_format_with_string_table;
}
} // namespace jit
} // namespace torch