node/src/compile_cache.cc at main · nodejs/node · GitHub

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#include "compile_cache.h"

#include <string>

#include "debug_utils-inl.h"

#include "env-inl.h"

#include "node_file.h"

#include "node_internals.h"

#include "node_version.h"

#include "path.h"

#include "util.h"

#include "zlib.h"

#ifdef NODE_IMPLEMENTS_POSIX_CREDENTIALS

#include <unistd.h> // getuid

#endif

#ifdef _WIN32

#include <windows.h>

#endif

namespace node {

using v8::Function;

using v8::Local;

using v8::Module;

using v8::ScriptCompiler;

using v8::String;

namespace {

std::string Uint32ToHex(uint32_t crc) {

std::string str;

str.reserve(8);

for (int i = 28; i >= 0; i -= 4) {

char digit = (crc >> i) & 0xF;

digit += digit < 10 ? '0' : 'a' - 10;

str.push_back(digit);

}

return str;

}

// TODO(joyeecheung): use other hashes?

uint32_t GetHash(const char* data, size_t size) {

uLong crc = crc32(0L, Z_NULL, 0);

return crc32(crc, reinterpret_cast<const Bytef*>(data), size);

}

std::string GetCacheVersionTag(EnableOption option) {

std::string tag = std::string(NODE_VERSION) + '-' + std::string(NODE_ARCH) +

'-' + Uint32ToHex(ScriptCompiler::CachedDataVersionTag());

#ifdef NODE_IMPLEMENTS_POSIX_CREDENTIALS

// On platforms where uids are available, use different folders for

// different users to avoid cache miss due to permission incompatibility.

// On platforms where uids are not available, bare with the cache miss.

// This should be fine on Windows, as there local directories tend to be

// user-specific.

// A portable cache is meant to be reused wherever the same layout is

// found, including by other users (e.g. a cache generated at build time

// and shipped read-only with an application), so it is not split by uid:

// a user who cannot write to it still reads it, and a failed write is

// only a cache miss.

if (option != EnableOption::PORTABLE) {

tag += '-' + std::to_string(getuid());

}

#endif

return tag;

}

uint32_t GetCacheKey(std::string_view filename, CachedCodeType type) {

uLong crc = crc32(0L, Z_NULL, 0);

crc = crc32(crc, reinterpret_cast<const Bytef*>(&type), sizeof(type));

crc = crc32(

crc, reinterpret_cast<const Bytef*>(filename.data()), filename.length());

return crc;

}

} // namespace

template <typename... Args>

inline void CompileCacheHandler::Debug(const char* format,

Args&&... args) const {

if (is_debug_) [[unlikely]] {

FPrintF(stderr, format, std::forward<Args>(args)...);

}

ScriptCompiler::CachedData* CompileCacheEntry::CopyCache() const {

DCHECK_NOT_NULL(cache);

int cache_size = cache->length;

uint8_t* data = new uint8_t[cache_size];

memcpy(data, cache->data, cache_size);

return new ScriptCompiler::CachedData(

data, cache_size, ScriptCompiler::CachedData::BufferOwned);

}

// Used for identifying and verifying a file is a compile cache file.

// See comments in CompileCacheHandler::Persist().

constexpr uint32_t kCacheMagicNumber = 0x8adfdbb2;

const char* CompileCacheEntry::type_name() const {

switch (type) {

case CachedCodeType::kCommonJS:

return "CommonJS";

case CachedCodeType::kESM:

return "ESM";

case CachedCodeType::kStrippedTypeScript:

return "StrippedTypeScript";

default:

UNREACHABLE();

}

void CompileCacheHandler::ReadCacheFile(CompileCacheEntry* entry) {

Debug("[compile cache] reading cache from %s for %s %s...",

entry->cache_filename,

entry->type_name(),

entry->source_filename);

uv_fs_t req;

auto defer_req_cleanup = OnScopeLeave([&req]() { uv_fs_req_cleanup(&req); });

const char* path = entry->cache_filename.c_str();

uv_file file = uv_fs_open(nullptr, &req, path, O_RDONLY, 0, nullptr);

if (req.result < 0) {

// req will be cleaned up by scope leave.

Debug(" %s\n", uv_strerror(req.result));

return;

}

uv_fs_req_cleanup(&req);

auto defer_close = OnScopeLeave([file]() {

uv_fs_t close_req;

CHECK_EQ(0, uv_fs_close(nullptr, &close_req, file, nullptr));

uv_fs_req_cleanup(&close_req);

});

// Read the headers.

std::vector<uint32_t> headers(kHeaderCount);

uv_buf_t headers_buf = uv_buf_init(reinterpret_cast<char*>(headers.data()),

kHeaderCount * sizeof(uint32_t));

const int r = uv_fs_read(nullptr, &req, file, &headers_buf, 1, 0, nullptr);

if (r != static_cast<int>(headers_buf.len)) {

Debug("reading header failed, bytes read %d", r);

if (req.result < 0 && is_debug_) {

Debug(", %s", uv_strerror(req.result));

}

Debug("\n");

return;

}

Debug("[%d %d %d %d %d]...",

headers[kMagicNumberOffset],

headers[kCodeSizeOffset],

headers[kCacheSizeOffset],

headers[kCodeHashOffset],

headers[kCacheHashOffset]);

if (headers[kMagicNumberOffset] != kCacheMagicNumber) {

Debug("magic number mismatch: expected %d, actual %d\n",

kCacheMagicNumber,

headers[kMagicNumberOffset]);

return;

}

// Check the code size and hash which are already computed.

if (headers[kCodeSizeOffset] != entry->code_size) {

Debug("code size mismatch: expected %d, actual %d\n",

entry->code_size,

headers[kCodeSizeOffset]);

return;

}

if (headers[kCodeHashOffset] != entry->code_hash) {

Debug("code hash mismatch: expected %d, actual %d\n",

entry->code_hash,

headers[kCodeHashOffset]);

return;

}

// Read the cache, grow the buffer exponentially whenever it fills up.

size_t offset = headers_buf.len;

size_t capacity = 4096; // Initial buffer capacity

size_t total_read = 0;

auto buffer = std::make_unique<uint8_t[]>(capacity);

while (true) {

// If there is not enough space to read more data, do a simple

// realloc here (we don't actually realloc because V8 requires

// the underlying buffer to be delete[]-able).

if (total_read == capacity) {

size_t new_capacity = capacity * 2;

auto new_buffer = std::make_unique<uint8_t[]>(new_capacity);

memcpy(new_buffer.get(), buffer.get(), capacity);

buffer = std::move(new_buffer);

capacity = new_capacity;

}

uv_buf_t iov =

uv_buf_init(reinterpret_cast<char*>(buffer.get() + total_read),

capacity - total_read);

int bytes_read =

uv_fs_read(nullptr, &req, file, &iov, 1, offset + total_read, nullptr);

if (req.result < 0) { // Error.

// req will be cleaned up by scope leave.

Debug(" %s\n", uv_strerror(req.result));

return;

}

uv_fs_req_cleanup(&req);

if (bytes_read <= 0) {

break;

}

total_read += bytes_read;

}

// Check the cache size and hash.

if (headers[kCacheSizeOffset] != total_read) {

Debug("cache size mismatch: expected %d, actual %d\n",

headers[kCacheSizeOffset],

total_read);

return;

}

uint32_t cache_hash =

GetHash(reinterpret_cast<char*>(buffer.get()), total_read);

if (headers[kCacheHashOffset] != cache_hash) {

Debug("cache hash mismatch: expected %d, actual %d\n",

headers[kCacheHashOffset],

cache_hash);

return;

}

entry->cache.reset(new ScriptCompiler::CachedData(

buffer.release(), total_read, ScriptCompiler::CachedData::BufferOwned));

Debug(" success, size=%d\n", total_read);

}

static std::string GetRelativePath(std::string_view path,

std::string_view base) {

// On Windows, the native encoding is UTF-16, so we need to convert

// the paths to wide strings before using std::filesystem::path.

// On other platforms, std::filesystem::path can handle UTF-8 directly.

#ifdef _WIN32

std::filesystem::path module_path(ConvertUTF8ToWideString(std::string(path)));

std::filesystem::path base_path(ConvertUTF8ToWideString(std::string(base)));

#else

std::filesystem::path module_path(path);

std::filesystem::path base_path(base);

#endif

std::filesystem::path relative = module_path.lexically_relative(base_path);

auto u8str = relative.u8string();

return std::string(u8str.begin(), u8str.end());

}

CompileCacheEntry* CompileCacheHandler::GetOrInsert(Local<String> code,

Local<String> filename,

CachedCodeType type) {

DCHECK(!compile_cache_dir_.empty());

Environment* env = Environment::GetCurrent(isolate_->GetCurrentContext());

Utf8Value filename_utf8(isolate_, filename);

std::string file_path = filename_utf8.ToString();

// If the portable cache is enabled and it seems possible to compute the

// relative position from an absolute path, we use the relative position

// in the cache key.

if (HasOption(portable_, EnableOption::PORTABLE) &&

IsAbsoluteFilePath(file_path)) {

// Normalize the path to ensure it is consistent.

std::string normalized_file_path = NormalizeFileURLOrPath(env, file_path);

if (normalized_file_path.empty()) {

return nullptr;

}

std::string relative_path =

GetRelativePath(normalized_file_path, normalized_compile_cache_dir_);

if (!relative_path.empty()) {

file_path = relative_path;

Debug("[compile cache] using relative path %s from %s\n",

file_path,

compile_cache_dir_);

}

uint32_t key = GetCacheKey(file_path, type);

// TODO(joyeecheung): don't encode this again into UTF8. If we read the

// UTF8 content on disk as raw buffer (from the JS layer, while watching out

// for monkey patching), we can just hash it directly.

Utf8Value code_utf8(isolate_, code);

uint32_t code_hash = GetHash(code_utf8.out(), code_utf8.length());

auto loaded = compiler_cache_store_.find(key);

// TODO(joyeecheung): let V8's in-isolate compilation cache take precedence.

if (loaded != compiler_cache_store_.end() &&

loaded->second->code_hash == code_hash) {

return loaded->second.get();

}

// If the code hash mismatches, the code has changed, discard the stale entry

// and create a new one.

auto emplaced =

compiler_cache_store_.emplace(key, std::make_unique<CompileCacheEntry>());

auto* result = emplaced.first->second.get();

result->code_hash = code_hash;

result->code_size = code_utf8.length();

result->cache_key = key;

result->cache_filename =

compile_cache_dir_ + kPathSeparator + Uint32ToHex(key);

result->source_filename = filename_utf8.ToString();

result->cache = nullptr;

result->type = type;

// TODO(joyeecheung): if we fail enough times, stop trying for any future

// files.

ReadCacheFile(result);

return result;

}

ScriptCompiler::CachedData* SerializeCodeCache(Local<Function> func) {

return ScriptCompiler::CreateCodeCacheForFunction(func);

}

ScriptCompiler::CachedData* SerializeCodeCache(Local<Module> mod) {

return ScriptCompiler::CreateCodeCache(mod->GetUnboundModuleScript());

}

template <typename T>

void CompileCacheHandler::MaybeSaveImpl(CompileCacheEntry* entry,

Local<T> func_or_mod,

bool rejected) {

DCHECK_NOT_NULL(entry);

Debug("[compile cache] V8 code cache for %s %s was %s, ",

entry->type_name(),

entry->source_filename,

rejected ? "rejected"

: (entry->cache == nullptr) ? "not initialized"

: "accepted");

if (entry->cache != nullptr && !rejected) { // accepted

Debug("keeping the in-memory entry\n");

return;

}

if (read_only_) {

Debug("read-only, not serializing\n");

return;

}

Debug("%s the in-memory entry\n",

entry->cache == nullptr ? "initializing" : "refreshing");

ScriptCompiler::CachedData* data = SerializeCodeCache(func_or_mod);

DCHECK_EQ(data->buffer_policy, ScriptCompiler::CachedData::BufferOwned);

entry->refreshed = true;

entry->cache.reset(data);

}

void CompileCacheHandler::MaybeSave(CompileCacheEntry* entry,

Local<Module> mod,

bool rejected) {

DCHECK(mod->IsSourceTextModule());

MaybeSaveImpl(entry, mod, rejected);

}

void CompileCacheHandler::MaybeSave(CompileCacheEntry* entry,

Local<Function> func,

bool rejected) {

MaybeSaveImpl(entry, func, rejected);

}

void CompileCacheHandler::MaybeSave(CompileCacheEntry* entry,

std::string_view transpiled) {

if (read_only_) {

return;

}

CHECK(entry->type == CachedCodeType::kStrippedTypeScript);

Debug("[compile cache] saving transpilation cache for %s %s\n",

entry->type_name(),

entry->source_filename);

// TODO(joyeecheung): it's weird to copy it again here. Convert the v8::String

// directly into buffer held by v8::ScriptCompiler::CachedData here.

int cache_size = static_cast<int>(transpiled.size());

uint8_t* data = new uint8_t[cache_size];

memcpy(data, transpiled.data(), cache_size);

entry->cache.reset(new ScriptCompiler::CachedData(

data, cache_size, ScriptCompiler::CachedData::BufferOwned));

entry->refreshed = true;

}

/**

* Persist the compile cache accumulated in memory to disk.

* To avoid race conditions, the cache file includes hashes of the original

* source code and the cache content. It's first written to a temporary file

* before being renamed to the target name.

* Layout of a cache file:

* [uint32_t] magic number

* [uint32_t] code size

* [uint32_t] code hash

* [uint32_t] cache size

* [uint32_t] cache hash

* .... compile cache content ....

void CompileCacheHandler::Persist() {

DCHECK(!compile_cache_dir_.empty());

if (read_only_) {

Debug("[compile cache] read-only, skipping persistence\n");

return;

}

// TODO(joyeecheung): do this using a separate event loop to utilize the

// libuv thread pool and do the file system operations concurrently.

// TODO(joyeecheung): Currently flushing is triggered by either process

// shutdown or user requests. In the future we should simply start the

// writes right after module loading on a separate thread, and this method

// only blocks until all the pending writes (if any) on the other thread are

// finished. In that case, the off-thread writes should finish long

// before any attempt of flushing is made so the method would then only

// incur a negligible overhead from thread synchronization.

for (auto& pair : compiler_cache_store_) {

auto* entry = pair.second.get();

const char* type_name = entry->type_name();

if (entry->cache == nullptr) {

Debug("[compile cache] skip persisting %s %s because the cache was not "

"initialized\n",

type_name,

entry->source_filename);

continue;

}

if (entry->refreshed == false) {

Debug(

"[compile cache] skip persisting %s %s because cache was the same\n",

type_name,

entry->source_filename);

continue;

}

if (entry->persisted == true) {

Debug("[compile cache] skip persisting %s %s because cache was already "

"persisted\n",

type_name,

entry->source_filename);

continue;

}

DCHECK_EQ(entry->cache->buffer_policy,

ScriptCompiler::CachedData::BufferOwned);

char* cache_ptr =

reinterpret_cast<char*>(const_cast<uint8_t*>(entry->cache->data));

uint32_t cache_size = static_cast<uint32_t>(entry->cache->length);

uint32_t cache_hash = GetHash(cache_ptr, cache_size);

// Generating headers.

std::vector<uint32_t> headers(kHeaderCount);

headers[kMagicNumberOffset] = kCacheMagicNumber;

headers[kCodeSizeOffset] = entry->code_size;

headers[kCacheSizeOffset] = cache_size;

headers[kCodeHashOffset] = entry->code_hash;

headers[kCacheHashOffset] = cache_hash;

// Generate the temporary filename.

// The temporary file should be placed in a location like:

// $NODE_COMPILE_CACHE_DIR/v23.0.0-pre-arm64-5fad6d45-501/e7f8ef7f.cache.tcqrsK

// 1. $NODE_COMPILE_CACHE_DIR either comes from the $NODE_COMPILE_CACHE

// environment

// variable or `module.enableCompileCache()`.

// 2. v23.0.0-pre-arm64-5fad6d45-501 is the sub cache directory and

// e7f8ef7f is the hash for the cache (see

// CompileCacheHandler::Enable()),

// 3. tcqrsK is generated by uv_fs_mkstemp() as a temporary identifier.

uv_fs_t mkstemp_req;

auto cleanup_mkstemp =

OnScopeLeave([&mkstemp_req]() { uv_fs_req_cleanup(&mkstemp_req); });

std::string cache_filename_tmp = entry->cache_filename + ".XXXXXX";

Debug("[compile cache] Creating temporary file for cache of %s (%s)...",

entry->source_filename,

type_name);

int err = uv_fs_mkstemp(

nullptr, &mkstemp_req, cache_filename_tmp.c_str(), nullptr);

if (err < 0) {

Debug("failed. %s\n", uv_strerror(err));

continue;

}

Debug(" -> %s\n", mkstemp_req.path);

Debug("[compile cache] writing cache for %s %s to temporary file %s [%d "

"%d %d "

"%d %d]...",

type_name,

entry->source_filename,

mkstemp_req.path,

headers[kMagicNumberOffset],

headers[kCodeSizeOffset],

headers[kCacheSizeOffset],

headers[kCodeHashOffset],

headers[kCacheHashOffset]);

// Write to the temporary file.

uv_buf_t headers_buf = uv_buf_init(reinterpret_cast<char*>(headers.data()),

headers.size() * sizeof(uint32_t));

uv_buf_t data_buf = uv_buf_init(cache_ptr, entry->cache->length);

uv_buf_t bufs[] = {headers_buf, data_buf};

uv_fs_t write_req;

auto cleanup_write =

OnScopeLeave([&write_req]() { uv_fs_req_cleanup(&write_req); });

err = uv_fs_write(

nullptr, &write_req, mkstemp_req.result, bufs, 2, 0, nullptr);

if (err < 0) {

Debug("failed: %s\n", uv_strerror(err));

continue;

}

uv_fs_t close_req;

auto cleanup_close =

OnScopeLeave([&close_req]() { uv_fs_req_cleanup(&close_req); });

err = uv_fs_close(nullptr, &close_req, mkstemp_req.result, nullptr);

if (err < 0) {

Debug("failed: %s\n", uv_strerror(err));

continue;

}

Debug("success\n");

// Rename the temporary file to the actual cache file.

uv_fs_t rename_req;

auto cleanup_rename =

OnScopeLeave([&rename_req]() { uv_fs_req_cleanup(&rename_req); });

std::string cache_filename_final = entry->cache_filename;

Debug("[compile cache] Renaming %s to %s...",

mkstemp_req.path,

cache_filename_final);

err = uv_fs_rename(nullptr,

&rename_req,

mkstemp_req.path,

cache_filename_final.c_str(),

nullptr);

if (err < 0) {

Debug("failed: %s\n", uv_strerror(err));

continue;

}

Debug("success\n");

entry->persisted = true;

}

// Clear the map at the end in one go instead of during the iteration to

// avoid rehashing costs.

Debug("[compile cache] Clear deserialized cache.\n");

compiler_cache_store_.clear();

}

CompileCacheHandler::CompileCacheHandler(Environment* env)

: isolate_(env->isolate()),

is_debug_(

env->enabled_debug_list()->enabled(DebugCategory::COMPILE_CACHE)) {}

// Directory structure:

// - Compile cache directory (from NODE_COMPILE_CACHE)

// - $NODE_VERSION-$ARCH-$CACHE_DATA_VERSION_TAG-$UID

// ($UID is omitted for a portable cache)

// - $FILENAME_AND_MODULE_TYPE_HASH.cache: a hash of filename + module type

CompileCacheEnableResult CompileCacheHandler::Enable(Environment* env,

const std::string& dir,

EnableOption option) {

std::string cache_tag = GetCacheVersionTag(option);

std::string absolute_cache_dir_base = PathResolve(env, {dir});

std::string cache_dir_with_tag =

absolute_cache_dir_base + kPathSeparator + cache_tag;

CompileCacheEnableResult result;

Debug("[compile cache] resolved path %s + %s -> %s\n",

dir,

cache_tag,

cache_dir_with_tag);

const bool read_only = HasOption(option, EnableOption::READ_ONLY);

if (!read_only && !env->permission()->is_granted(

env,

permission::PermissionScope::kFileSystemWrite,

cache_dir_with_tag)) [[unlikely]] {

result.message = "Skipping compile cache because write permission for " +

cache_dir_with_tag + " is not granted";

result.status = CompileCacheEnableStatus::FAILED;

return result;

}

if (!env->permission()->is_granted(

env,

permission::PermissionScope::kFileSystemRead,

cache_dir_with_tag)) [[unlikely]] {

result.message = "Skipping compile cache because read permission for " +

cache_dir_with_tag + " is not granted";

result.status = CompileCacheEnableStatus::FAILED;

return result;

}

if (read_only) {

// A read-only cache is used as found and never created: without the

// directory there is nothing to read.

uv_fs_t stat_req;

int err =

uv_fs_stat(nullptr, &stat_req, cache_dir_with_tag.c_str(), nullptr);

// libuv normalizes st_mode across platforms; MSVC has no S_ISDIR macro.

bool is_dir = err == 0 && (stat_req.statbuf.st_mode & S_IFMT) == S_IFDIR;

uv_fs_req_cleanup(&stat_req);

Debug("[compile cache] read-only cache directory %s...%s\n",

cache_dir_with_tag,

is_dir ? "found" : "not found");

if (!is_dir) {

result.message =

"Cache directory does not exist (read-only): " + cache_dir_with_tag;

result.status = CompileCacheEnableStatus::FAILED;

return result;

}

} else {

fs::FSReqWrapSync req_wrap;

int err = fs::MKDirpSync(

nullptr, &(req_wrap.req), cache_dir_with_tag, 0777, nullptr);

if (is_debug_) {

Debug("[compile cache] creating cache directory %s...%s\n",

cache_dir_with_tag,

err < 0 ? uv_strerror(err) : "success");

}

if (err != 0 && err != UV_EEXIST) {

result.message =

"Cannot create cache directory: " + std::string(uv_strerror(err));

result.status = CompileCacheEnableStatus::FAILED;

return result;

}

result.cache_directory = absolute_cache_dir_base;

compile_cache_dir_ = cache_dir_with_tag;

portable_ = option;

read_only_ = read_only;

if (HasOption(option, EnableOption::PORTABLE)) {

normalized_compile_cache_dir_ =

NormalizeFileURLOrPath(env, compile_cache_dir_);

}

result.status = CompileCacheEnableStatus::ENABLED;

return result;

}

} // namespace node

node/src/compile_cache.cc at main · nodejs/node · GitHub

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