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#include <torch/csrc/jit/serialization/source_range_serialization.h>
#include <torch/csrc/jit/serialization/source_range_serialization_impl.h>
#include <ATen/core/ivalue.h>
#include <torch/csrc/jit/serialization/pickle.h>
namespace torch {
namespace jit {
class SourceRangeSerializer {
public:
// Serialize SourceRange as Tuple[SourceType, int, int]
// where SourceType = Tuple[str, Optional[str], int, List[int]],
// the serialized form of Source
c10::IValue serialize(const SourceRange& sr);
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;
};
class SourceRangeDeserializer {
public:
SourceRange deserialize(const c10::IValue& iv) {
auto tup_elems = iv.toTuple()->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_);
}
private:
std::shared_ptr<Source> deserialize_source(const c10::IValue& iv) {
auto tup = iv.toTuple();
if (cached_sources.count(tup)) {
return cached_sources.at(tup);
}
auto tup_elems = tup->elements();
TORCH_INTERNAL_ASSERT(tup_elems.size() == 3);
std::string text_ = tup_elems[0].toString()->string();
c10::optional<std::string> filename_ =
tup_elems[1].toOptional<std::string>();
int64_t starting_line_no_ = tup_elems[2].toInt();
auto source = std::make_shared<Source>(
std::move(text_), std::move(filename_), starting_line_no_);
cached_sources[tup] = source;
return source;
}
std::unordered_map<
c10::intrusive_ptr<c10::ivalue::Tuple>,
std::shared_ptr<Source>>
cached_sources;
};
c10::IValue SourceRangeSerializer::serialize(const SourceRange& sr) {
std::vector<c10::IValue> elements = {
serialize_source(sr.source()), (int64_t)sr.start(), (int64_t)sr.end()};
return c10::ivalue::Tuple::create(std::move(elements));
}
c10::IValue SourceRangeSerializer::serialize_source(
const std::shared_ptr<Source>& s) {
if (serialized_sources.count(s)) {
return serialized_sources.at(s);
}
std::vector<c10::IValue> elements;
if (s == nullptr) {
elements = {"", "", 0};
} else {
elements = {s->text(), s->filename(), (int64_t)s->starting_line_no()};
}
auto serialized = c10::ivalue::Tuple::create(std::move(elements));
serialized_sources[s] = serialized;
return serialized;
}
SourceRangePickler::SourceRangePickler() : srs(new SourceRangeSerializer()) {}
std::vector<char> SourceRangePickler::pickle(const SourceRangeRecords& ranges) {
std::vector<c10::IValue> ivalues;
for (const auto& range : ranges) {
std::vector<c10::IValue> row_elems{(int64_t)range.bytes,
srs->serialize(range.range)};
ivalues.emplace_back(c10::ivalue::Tuple::create(std::move(row_elems)));
}
std::vector<at::Tensor> table;
auto ivalue = c10::ivalue::Tuple::create(std::move(ivalues));
auto 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(new SourceRangeDeserializer()),
unpickled_records(nullptr) {}
void ConcreteSourceRangeUnpickler::unpickle() {
if (unpickled_records) {
return;
}
auto ivalues = jit::unpickle(reinterpret_cast<const char*>(data.get()), size)
.toTuple()
->elements();
unpickled_records = std::make_shared<SourceRangeRecords>();
for (auto& val : ivalues) {
auto tup_elems = val.toTuple()->elements();
int64_t offset = tup_elems[0].toInt();
auto source_range = deserializer->deserialize(tup_elems[1]);
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;
}
} // namespace jit
} // namespace torch
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