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src: move BlobSerializerDeserializer to a separate header file
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This should make it possible to reuse the BlobSerializer and the
BlobDeserializer classes in SEAs to generate and parse the injected
blob.

This change also resolves this TODO:
https://github.com/nodejs/node/blob/4f69aae6a04a460f267005dcf6551959064b3238/src/node_snapshotable.cc#L187

Refs: nodejs#47458
Signed-off-by: Darshan Sen <raisinten@gmail.com>
PR-URL: nodejs#47933
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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RaisinTen authored and MoLow committed Jul 6, 2023
1 parent 4737314 commit 4c55681
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359 changes: 359 additions & 0 deletions src/blob_serializer_deserializer-inl.h
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#ifndef SRC_BLOB_SERIALIZER_DESERIALIZER_INL_H_
#define SRC_BLOB_SERIALIZER_DESERIALIZER_INL_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "blob_serializer_deserializer.h"

#include <ostream>
#include <sstream>
#include <string>
#include <type_traits>
#include <utility>

#include "debug_utils-inl.h"

// This is related to the blob that is used in snapshots and has nothing to do
// with `node_blob.h`.

namespace node {

struct EnvSerializeInfo;
struct PropInfo;
struct RealmSerializeInfo;

namespace builtins {
struct CodeCacheInfo;
} // namespace builtins

// These operator<< overload declarations are needed because
// BlobSerializerDeserializer::ToStr() uses these.

std::ostream& operator<<(std::ostream& output,
const builtins::CodeCacheInfo& info);

std::ostream& operator<<(std::ostream& output,
const std::vector<builtins::CodeCacheInfo>& vec);

std::ostream& operator<<(std::ostream& output, const std::vector<uint8_t>& vec);

std::ostream& operator<<(std::ostream& output,
const std::vector<PropInfo>& vec);

std::ostream& operator<<(std::ostream& output, const PropInfo& info);

std::ostream& operator<<(std::ostream& output,
const std::vector<std::string>& vec);

std::ostream& operator<<(std::ostream& output, const RealmSerializeInfo& i);

std::ostream& operator<<(std::ostream& output, const EnvSerializeInfo& i);

template <typename... Args>
void BlobSerializerDeserializer::Debug(const char* format,
Args&&... args) const {
if (is_debug) {
FPrintF(stderr, format, std::forward<Args>(args)...);
}
}

template <typename T>
std::string BlobSerializerDeserializer::ToStr(const T& arg) const {
std::stringstream ss;
ss << arg;
return ss.str();
}

template <typename T>
std::string BlobSerializerDeserializer::GetName() const {
#define TYPE_LIST(V) \
V(builtins::CodeCacheInfo) \
V(PropInfo) \
V(std::string)

#define V(TypeName) \
if constexpr (std::is_same_v<T, TypeName>) { \
return #TypeName; \
} else // NOLINT(readability/braces)
TYPE_LIST(V)
#undef V

if constexpr (std::is_arithmetic_v<T>) {
return (std::is_unsigned_v<T> ? "uint"
: std::is_integral_v<T> ? "int"
: "float") +
std::to_string(sizeof(T) * 8) + "_t";
}
return "";
}

// Helper for reading numeric types.
template <typename Impl>
template <typename T>
T BlobDeserializer<Impl>::ReadArithmetic() {
static_assert(std::is_arithmetic_v<T>, "Not an arithmetic type");
T result;
ReadArithmetic(&result, 1);
return result;
}

// Layout of vectors:
// [ 4/8 bytes ] count
// [ ... ] contents (count * size of individual elements)
template <typename Impl>
template <typename T>
std::vector<T> BlobDeserializer<Impl>::ReadVector() {
if (is_debug) {
std::string name = GetName<T>();
Debug("\nReadVector<%s>()(%d-byte)\n", name.c_str(), sizeof(T));
}
size_t count = static_cast<size_t>(ReadArithmetic<size_t>());
if (count == 0) {
return std::vector<T>();
}
if (is_debug) {
Debug("Reading %d vector elements...\n", count);
}
std::vector<T> result;
if constexpr (std::is_arithmetic_v<T>) {
result = ReadArithmeticVector<T>(count);
} else {
result = ReadNonArithmeticVector<T>(count);
}
if (is_debug) {
std::string str = std::is_arithmetic_v<T> ? "" : ToStr(result);
std::string name = GetName<T>();
Debug("ReadVector<%s>() read %s\n", name.c_str(), str.c_str());
}
return result;
}

template <typename Impl>
std::string BlobDeserializer<Impl>::ReadString() {
size_t length = ReadArithmetic<size_t>();

if (is_debug) {
Debug("ReadString(), length=%d: ", length);
}

CHECK_GT(length, 0); // There should be no empty strings.
MallocedBuffer<char> buf(length + 1);
memcpy(buf.data, sink.data() + read_total, length + 1);
std::string result(buf.data, length); // This creates a copy of buf.data.

if (is_debug) {
Debug("\"%s\", read %zu bytes\n", result.c_str(), length + 1);
}

read_total += length + 1;
return result;
}

// Helper for reading an array of numeric types.
template <typename Impl>
template <typename T>
void BlobDeserializer<Impl>::ReadArithmetic(T* out, size_t count) {
static_assert(std::is_arithmetic_v<T>, "Not an arithmetic type");
DCHECK_GT(count, 0); // Should not read contents for vectors of size 0.
if (is_debug) {
std::string name = GetName<T>();
Debug("Read<%s>()(%d-byte), count=%d: ", name.c_str(), sizeof(T), count);
}

size_t size = sizeof(T) * count;
memcpy(out, sink.data() + read_total, size);

if (is_debug) {
std::string str =
"{ " + std::to_string(out[0]) + (count > 1 ? ", ... }" : " }");
Debug("%s, read %zu bytes\n", str.c_str(), size);
}
read_total += size;
}

// Helper for reading numeric vectors.
template <typename Impl>
template <typename Number>
std::vector<Number> BlobDeserializer<Impl>::ReadArithmeticVector(size_t count) {
static_assert(std::is_arithmetic_v<Number>, "Not an arithmetic type");
DCHECK_GT(count, 0); // Should not read contents for vectors of size 0.
std::vector<Number> result(count);
ReadArithmetic(result.data(), count);
return result;
}

// Helper for reading non-numeric vectors.
template <typename Impl>
template <typename T>
std::vector<T> BlobDeserializer<Impl>::ReadNonArithmeticVector(size_t count) {
static_assert(!std::is_arithmetic_v<T>, "Arithmetic type");
DCHECK_GT(count, 0); // Should not read contents for vectors of size 0.
std::vector<T> result;
result.reserve(count);
bool original_is_debug = is_debug;
is_debug = original_is_debug && !std::is_same_v<T, std::string>;
for (size_t i = 0; i < count; ++i) {
if (is_debug) {
Debug("\n[%d] ", i);
}
result.push_back(ReadElement<T>());
}
is_debug = original_is_debug;

return result;
}

template <typename Impl>
template <typename T>
T BlobDeserializer<Impl>::ReadElement() {
if constexpr (std::is_arithmetic_v<T>) {
return ReadArithmetic<T>();
} else if constexpr (std::is_same_v<T, std::string>) {
return ReadString();
} else {
return impl()->template Read<T>();
}
}

// Helper for writing numeric types.
template <typename Impl>
template <typename T>
size_t BlobSerializer<Impl>::WriteArithmetic(const T& data) {
static_assert(std::is_arithmetic_v<T>, "Not an arithmetic type");
return WriteArithmetic(&data, 1);
}

// Layout of vectors:
// [ 4/8 bytes ] count
// [ ... ] contents (count * size of individual elements)
template <typename Impl>
template <typename T>
size_t BlobSerializer<Impl>::WriteVector(const std::vector<T>& data) {
if (is_debug) {
std::string str = std::is_arithmetic_v<T> ? "" : ToStr(data);
std::string name = GetName<T>();
Debug("\nWriteVector<%s>() (%d-byte), count=%d: %s\n",
name.c_str(),
sizeof(T),
data.size(),
str.c_str());
}

size_t written_total = WriteArithmetic<size_t>(data.size());
if (data.size() == 0) {
return written_total;
}

if constexpr (std::is_arithmetic_v<T>) {
written_total += WriteArithmeticVector<T>(data);
} else {
written_total += WriteNonArithmeticVector<T>(data);
}

if (is_debug) {
std::string name = GetName<T>();
Debug("WriteVector<%s>() wrote %d bytes\n", name.c_str(), written_total);
}

return written_total;
}

// The layout of a written string:
// [ 4/8 bytes ] length
// [ |length| bytes ] contents
template <typename Impl>
size_t BlobSerializer<Impl>::WriteString(const std::string& data) {
CHECK_GT(data.size(), 0); // No empty strings should be written.
size_t written_total = WriteArithmetic<size_t>(data.size());
if (is_debug) {
std::string str = ToStr(data);
Debug("WriteString(), length=%zu: \"%s\"\n", data.size(), data.c_str());
}

// Write the null-terminated string.
size_t length = data.size() + 1;
sink.insert(sink.end(), data.c_str(), data.c_str() + length);
written_total += length;

if (is_debug) {
Debug("WriteString() wrote %zu bytes\n", written_total);
}

return written_total;
}

// Helper for writing an array of numeric types.
template <typename Impl>
template <typename T>
size_t BlobSerializer<Impl>::WriteArithmetic(const T* data, size_t count) {
static_assert(std::is_arithmetic_v<T>, "Arithmetic type");
DCHECK_GT(count, 0); // Should not write contents for vectors of size 0.
if (is_debug) {
std::string str =
"{ " + std::to_string(data[0]) + (count > 1 ? ", ... }" : " }");
std::string name = GetName<T>();
Debug("Write<%s>() (%zu-byte), count=%zu: %s",
name.c_str(),
sizeof(T),
count,
str.c_str());
}

size_t size = sizeof(T) * count;
const char* pos = reinterpret_cast<const char*>(data);
sink.insert(sink.end(), pos, pos + size);

if (is_debug) {
Debug(", wrote %zu bytes\n", size);
}
return size;
}

// Helper for writing numeric vectors.
template <typename Impl>
template <typename Number>
size_t BlobSerializer<Impl>::WriteArithmeticVector(
const std::vector<Number>& data) {
static_assert(std::is_arithmetic_v<Number>, "Arithmetic type");
return WriteArithmetic(data.data(), data.size());
}

// Helper for writing non-numeric vectors.
template <typename Impl>
template <typename T>
size_t BlobSerializer<Impl>::WriteNonArithmeticVector(
const std::vector<T>& data) {
static_assert(!std::is_arithmetic_v<T>, "Arithmetic type");
DCHECK_GT(data.size(),
0); // Should not write contents for vectors of size 0.
size_t written_total = 0;
bool original_is_debug = is_debug;
is_debug = original_is_debug && !std::is_same_v<T, std::string>;
for (size_t i = 0; i < data.size(); ++i) {
if (is_debug) {
Debug("\n[%d] ", i);
}
written_total += WriteElement<T>(data[i]);
}
is_debug = original_is_debug;

return written_total;
}

template <typename Impl>
template <typename T>
size_t BlobSerializer<Impl>::WriteElement(const T& data) {
if constexpr (std::is_arithmetic_v<T>) {
return WriteArithmetic<T>(data);
} else if constexpr (std::is_same_v<T, std::string>) {
return WriteString(data);
} else {
return impl()->template Write<T>(data);
}
}

} // namespace node

#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif // SRC_BLOB_SERIALIZER_DESERIALIZER_INL_H_
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