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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef SRC_NODE_H_

#define SRC_NODE_H_

#ifdef _WIN32

# ifndef BUILDING_NODE_EXTENSION

# define NODE_EXTERN __declspec(dllexport)

# else

# define NODE_EXTERN __declspec(dllimport)

# endif

#else

# define NODE_EXTERN __attribute__((visibility("default")))

#endif

// Declarations annotated with NODE_EXTERN_PRIVATE do not form part of

// the public API. They are implementation details that can and will

// change between releases, even in semver patch releases. Do not use

// any such symbol in external code.

#ifdef NODE_SHARED_MODE

#define NODE_EXTERN_PRIVATE NODE_EXTERN

#else

#define NODE_EXTERN_PRIVATE

#endif

#ifdef BUILDING_NODE_EXTENSION

# undef BUILDING_V8_SHARED

# undef BUILDING_UV_SHARED

# define USING_V8_SHARED 1

# define USING_UV_SHARED 1

#endif

// This should be defined in make system.

// See issue https://github.com/nodejs/node-v0.x-archive/issues/1236

#if defined(__MINGW32__) || defined(_MSC_VER)

#ifndef _WIN32_WINNT

# define _WIN32_WINNT 0x0600 // Windows Server 2008

#endif

#ifndef NOMINMAX

# define NOMINMAX

#endif

#if defined(_MSC_VER)

#define PATH_MAX MAX_PATH

#endif

#ifdef _WIN32

#define SIGQUIT 3

#define SIGKILL 9

#endif

#include "v8.h" // NOLINT(build/include_order)

#include "v8-platform.h" // NOLINT(build/include_order)

#include "node_version.h" // NODE_MODULE_VERSION

#include "node_api_types.h" // napi_addon_register_func

#include <functional>

#include <memory>

#include <optional>

#include <ostream>

// We cannot use __POSIX__ in this header because that's only defined when

// building Node.js.

#ifndef _WIN32

#include <signal.h>

#endif // _WIN32

#define NODE_MAKE_VERSION(major, minor, patch) \

((major) * 0x1000 + (minor) * 0x100 + (patch))

#ifdef __clang__

# define NODE_CLANG_AT_LEAST(major, minor, patch) \

(NODE_MAKE_VERSION(major, minor, patch) <= \

NODE_MAKE_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__))

#else

# define NODE_CLANG_AT_LEAST(major, minor, patch) (0)

#endif

#ifdef __GNUC__

# define NODE_GNUC_AT_LEAST(major, minor, patch) \

(NODE_MAKE_VERSION(major, minor, patch) <= \

NODE_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__))

#else

# define NODE_GNUC_AT_LEAST(major, minor, patch) (0)

#endif

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

# define NODE_DEPRECATED(message, declarator) declarator

#else // NODE_WANT_INTERNALS

#define NODE_DEPRECATED(message, declarator) [[deprecated(message)]] declarator

#endif

// Forward-declare libuv loop

struct uv_loop_s;

struct napi_module;

struct ssl_ctx_st; // Forward declaration of SSL_CTX for OpenSSL.

// Forward-declare these functions now to stop MSVS from becoming

// terminally confused when it's done in node_internals.h

namespace node {

struct SnapshotData;

namespace tracing {

class TracingController;

}

NODE_EXTERN v8::Local<v8::Value> ErrnoException(v8::Isolate* isolate,

int errorno,

const char* syscall = nullptr,

const char* message = nullptr,

const char* path = nullptr);

NODE_EXTERN v8::Local<v8::Value> UVException(v8::Isolate* isolate,

int errorno,

const char* syscall = nullptr,

const char* message = nullptr,

const char* path = nullptr,

const char* dest = nullptr);

NODE_DEPRECATED("Use ErrnoException(isolate, ...)",

inline v8::Local<v8::Value> ErrnoException(

int errorno,

const char* syscall = nullptr,

const char* message = nullptr,

const char* path = nullptr) {

return ErrnoException(v8::Isolate::GetCurrent(),

errorno,

syscall,

message,

path);

})

NODE_DEPRECATED("Use UVException(isolate, ...)",

inline v8::Local<v8::Value> UVException(int errorno,

const char* syscall = nullptr,

const char* message = nullptr,

const char* path = nullptr) {

return UVException(v8::Isolate::GetCurrent(),

errorno,

syscall,

message,

path);

})

} // namespace node

#include <cassert>

#include <cstdint>

#ifndef NODE_STRINGIFY

# define NODE_STRINGIFY(n) NODE_STRINGIFY_HELPER(n)

# define NODE_STRINGIFY_HELPER(n) #n

#endif

#ifdef _WIN32

#if !defined(_SSIZE_T_) && !defined(_SSIZE_T_DEFINED)

typedef intptr_t ssize_t;

# define _SSIZE_T_

# define _SSIZE_T_DEFINED

#endif

#else // !_WIN32

# include <sys/types.h> // size_t, ssize_t

#endif // _WIN32

namespace node {

class IsolateData;

class Environment;

class MultiIsolatePlatform;

class InitializationResultImpl;

namespace ProcessInitializationFlags {

enum Flags : uint32_t {

kNoFlags = 0,

// Enable stdio inheritance, which is disabled by default.

// This flag is also implied by kNoStdioInitialization.

kEnableStdioInheritance = 1 << 0,

// Disable reading the NODE_OPTIONS environment variable.

kDisableNodeOptionsEnv = 1 << 1,

// Do not parse CLI options.

kDisableCLIOptions = 1 << 2,

// Do not initialize ICU.

kNoICU = 1 << 3,

// Do not modify stdio file descriptor or TTY state.

kNoStdioInitialization = 1 << 4,

// Do not register Node.js-specific signal handlers

// and reset other signal handlers to default state.

kNoDefaultSignalHandling = 1 << 5,

// Do not perform V8 initialization.

kNoInitializeV8 = 1 << 6,

// Do not initialize a default Node.js-provided V8 platform instance.

kNoInitializeNodeV8Platform = 1 << 7,

// Do not initialize OpenSSL config.

kNoInitOpenSSL = 1 << 8,

// Do not initialize Node.js debugging based on environment variables.

kNoParseGlobalDebugVariables = 1 << 9,

// Do not adjust OS resource limits for this process.

kNoAdjustResourceLimits = 1 << 10,

// Legacy flag for not mapping code segments into large pages for this

// process. The feature is no longer supported so this is just a no-op.

kNoUseLargePages = 1 << 11,

// Skip printing output for --help, --version, --v8-options.

kNoPrintHelpOrVersionOutput = 1 << 12,

// Do not perform cppgc initialization. If set, the embedder must call

// cppgc::InitializeProcess() before creating a Node.js environment

// and call cppgc::ShutdownProcess() before process shutdown.

kNoInitializeCppgc = 1 << 13,

// Initialize the process for predictable snapshot generation.

kGeneratePredictableSnapshot = 1 << 14,

// Emulate the behavior of InitializeNodeWithArgs() when passing

// a flags argument to the InitializeOncePerProcess() replacement

// function.

kLegacyInitializeNodeWithArgsBehavior =

kNoStdioInitialization | kNoDefaultSignalHandling | kNoInitializeV8 |

kNoInitializeNodeV8Platform | kNoInitOpenSSL |

kNoParseGlobalDebugVariables | kNoAdjustResourceLimits |

kNoUseLargePages | kNoPrintHelpOrVersionOutput | kNoInitializeCppgc,

};

} // namespace ProcessInitializationFlags

namespace ProcessFlags = ProcessInitializationFlags; // Legacy alias.

namespace StopFlags {

enum Flags : uint32_t {

kNoFlags = 0,

// Do not explicitly terminate the Isolate

// when exiting the Environment.

kDoNotTerminateIsolate = 1 << 0,

};

} // namespace StopFlags

class NODE_EXTERN InitializationResult {

public:

virtual ~InitializationResult() = default;

// Returns a suggested process exit code.

virtual int exit_code() const = 0;

// Returns 'true' if initialization was aborted early due to errors.

virtual bool early_return() const = 0;

// Returns the parsed list of non-Node.js arguments.

virtual const std::vector<std::string>& args() const = 0;

// Returns the parsed list of Node.js arguments.

virtual const std::vector<std::string>& exec_args() const = 0;

// Returns an array of errors. Note that these may be warnings

// whose existence does not imply a non-zero exit code.

virtual const std::vector<std::string>& errors() const = 0;

// If kNoInitializeNodeV8Platform was not specified, the global Node.js

// platform instance.

virtual MultiIsolatePlatform* platform() const = 0;

private:

InitializationResult() = default;

friend class InitializationResultImpl;

};

// TODO(addaleax): Officially deprecate this and replace it with something

// better suited for a public embedder API.

NODE_EXTERN int Start(int argc, char* argv[]);

// Tear down Node.js while it is running (there are active handles

// in the loop and / or actively executing JavaScript code).

NODE_EXTERN int Stop(Environment* env,

StopFlags::Flags flags = StopFlags::kNoFlags);

// Set up per-process state needed to run Node.js. This will consume arguments

// from args, and return information about the initialization success,

// including the arguments split into argv/exec_argv, a list of potential

// errors encountered during initialization, and a potential suggested

// exit code.

NODE_EXTERN std::shared_ptr<InitializationResult> InitializeOncePerProcess(

const std::vector<std::string>& args,

ProcessInitializationFlags::Flags flags =

ProcessInitializationFlags::kNoFlags);

// Undoes the initialization performed by InitializeOncePerProcess(),

// where cleanup is necessary.

NODE_EXTERN void TearDownOncePerProcess();

// Convenience overload for specifying multiple flags without having

// to worry about casts.

inline std::shared_ptr<InitializationResult> InitializeOncePerProcess(

const std::vector<std::string>& args,

std::initializer_list<ProcessInitializationFlags::Flags> list) {

uint64_t flags_accum = ProcessInitializationFlags::kNoFlags;

for (const auto flag : list) flags_accum |= static_cast<uint64_t>(flag);

return InitializeOncePerProcess(

args, static_cast<ProcessInitializationFlags::Flags>(flags_accum));

}

enum OptionEnvvarSettings {

// Allow the options to be set via the environment variable, like

// `NODE_OPTIONS`.

kAllowedInEnvvar = 0,

// Disallow the options to be set via the environment variable, like

// `NODE_OPTIONS`.

kDisallowedInEnvvar = 1,

};

// Process the arguments and set up the per-process options.

// If the `settings` is set as OptionEnvvarSettings::kAllowedInEnvvar, the

// options that are allowed in the environment variable are processed. Options

// that are disallowed to be set via environment variable are processed as

// errors.

// Otherwise all the options that are disallowed (and those are allowed) to be

// set via environment variable are processed.

NODE_EXTERN int ProcessGlobalArgs(std::vector<std::string>* args,

std::vector<std::string>* exec_args,

std::vector<std::string>* errors,

OptionEnvvarSettings settings);

class NodeArrayBufferAllocator;

// An ArrayBuffer::Allocator class with some Node.js-specific tweaks. If you do

// not have to use another allocator, using this class is recommended:

// - It supports Buffer.allocUnsafe() and Buffer.allocUnsafeSlow() with

// uninitialized memory.

// - It supports transferring, rather than copying, ArrayBuffers when using

// MessagePorts.

class NODE_EXTERN ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {

public:

// If `always_debug` is true, create an ArrayBuffer::Allocator instance

// that performs additional integrity checks (e.g. make sure that only memory

// that was allocated by the it is also freed by it).

// This can also be set using the --debug-arraybuffer-allocations flag.

static std::unique_ptr<ArrayBufferAllocator> Create(

bool always_debug = false);

private:

virtual NodeArrayBufferAllocator* GetImpl() = 0;

friend class IsolateData;

};

// Legacy equivalents for ArrayBufferAllocator::Create().

NODE_EXTERN ArrayBufferAllocator* CreateArrayBufferAllocator();

NODE_EXTERN void FreeArrayBufferAllocator(ArrayBufferAllocator* allocator);

class NODE_EXTERN IsolatePlatformDelegate {

public:

virtual std::shared_ptr<v8::TaskRunner> GetForegroundTaskRunner() = 0;

virtual bool IdleTasksEnabled() = 0;

};

class NODE_EXTERN MultiIsolatePlatform : public v8::Platform {

public:

~MultiIsolatePlatform() override = default;

// Returns true if work was dispatched or executed. New tasks that are

// posted during flushing of the queue are postponed until the next

// flushing.

virtual bool FlushForegroundTasks(v8::Isolate* isolate) = 0;

virtual void DrainTasks(v8::Isolate* isolate) = 0;

// This needs to be called between the calls to `Isolate::Allocate()` and

// `Isolate::Initialize()`, so that initialization can already start

// using the platform.

// When using `NewIsolate()`, this is taken care of by that function.

// This function may only be called once per `Isolate`.

virtual void RegisterIsolate(v8::Isolate* isolate,

struct uv_loop_s* loop) = 0;

// This method can be used when an application handles task scheduling on its

// own through `IsolatePlatformDelegate`. Upon registering an isolate with

// this overload any other method in this class with the exception of

// `UnregisterIsolate` *must not* be used on that isolate.

virtual void RegisterIsolate(v8::Isolate* isolate,

IsolatePlatformDelegate* delegate) = 0;

// This function may only be called once per `Isolate`, and discard any

// pending delayed tasks scheduled for that isolate.

// This needs to be called right after calling `Isolate::Dispose()`.

virtual void UnregisterIsolate(v8::Isolate* isolate) = 0;

// This disposes, unregisters and frees up an isolate that's allocated using

// v8::Isolate::Allocate() in the correct order to prevent race conditions.

void DisposeIsolate(v8::Isolate* isolate);

// The platform should call the passed function once all state associated

// with the given isolate has been cleaned up. This can, but does not have to,

// happen asynchronously.

virtual void AddIsolateFinishedCallback(v8::Isolate* isolate,

void (*callback)(void*),

void* data) = 0;

static std::unique_ptr<MultiIsolatePlatform> Create(

int thread_pool_size,

v8::TracingController* tracing_controller = nullptr,

v8::PageAllocator* page_allocator = nullptr);

};

enum IsolateSettingsFlags {

MESSAGE_LISTENER_WITH_ERROR_LEVEL = 1 << 0,

DETAILED_SOURCE_POSITIONS_FOR_PROFILING = 1 << 1,

SHOULD_NOT_SET_PROMISE_REJECTION_CALLBACK = 1 << 2,

SHOULD_NOT_SET_PREPARE_STACK_TRACE_CALLBACK = 1 << 3,

ALLOW_MODIFY_CODE_GENERATION_FROM_STRINGS_CALLBACK = 0, /* legacy no-op */

};

struct IsolateSettings {

uint64_t flags = MESSAGE_LISTENER_WITH_ERROR_LEVEL |

DETAILED_SOURCE_POSITIONS_FOR_PROFILING;

v8::MicrotasksPolicy policy = v8::MicrotasksPolicy::kExplicit;

// Error handling callbacks

v8::Isolate::AbortOnUncaughtExceptionCallback

should_abort_on_uncaught_exception_callback = nullptr;

v8::FatalErrorCallback fatal_error_callback = nullptr;

v8::OOMErrorCallback oom_error_callback = nullptr;

v8::PrepareStackTraceCallback prepare_stack_trace_callback = nullptr;

// Miscellaneous callbacks

v8::PromiseRejectCallback promise_reject_callback = nullptr;

v8::AllowWasmCodeGenerationCallback

allow_wasm_code_generation_callback = nullptr;

v8::ModifyCodeGenerationFromStringsCallback2

modify_code_generation_from_strings_callback = nullptr;

// When the settings is passed to NewIsolate():

// - If cpp_heap is not nullptr, this CppHeap will be used to create

// the isolate and its ownership will be passed to V8.

// - If this is nullptr, Node.js will create a CppHeap that will be

// owned by V8.

// When the settings is passed to SetIsolateUpForNode():

// cpp_heap will be ignored. Embedders must ensure that the

// v8::Isolate has a CppHeap attached while it's still used by

// Node.js, for example using v8::CreateParams.

// See https://issues.chromium.org/issues/42203693. In future version

// of V8, this CppHeap will be created by V8 if not provided.

v8::CppHeap* cpp_heap = nullptr;

};

// Represents a startup snapshot blob, e.g. created by passing

// --node-snapshot-main=entry.js to the configure script at build time,

// or by running Node.js with the --build-snapshot option.

// If used, the snapshot *must* have been built with the same Node.js

// version and V8 flags as the version that is currently running, and will

// be rejected otherwise.

// The same EmbedderSnapshotData instance *must* be passed to both

// `NewIsolate()` and `CreateIsolateData()`. The first `Environment` instance

// should be created with an empty `context` argument and will then

// use the main context included in the snapshot blob. It can be retrieved

// using `GetMainContext()`. `LoadEnvironment` can receive an empty

// `StartExecutionCallback` in this case.

// If V8 was configured with the shared-readonly-heap option, it requires

// all snapshots used to create `Isolate` instances to be identical.

// This option *must* be unset by embedders who wish to use the startup

// feature during the build step by passing the --disable-shared-readonly-heap

// flag to the configure script.

// The snapshot *must* be kept alive during the execution of the Isolate

// that was created using it.

// Snapshots are an *experimental* feature. In particular, the embedder API

// exposed through this class is subject to change or removal between Node.js

// versions, including possible API and ABI breakage.

class EmbedderSnapshotData {

public:

struct DeleteSnapshotData {

void operator()(const EmbedderSnapshotData*) const;

};

using Pointer =

std::unique_ptr<const EmbedderSnapshotData, DeleteSnapshotData>;

// Return an EmbedderSnapshotData object that refers to the built-in

// snapshot of Node.js. This can have been configured through e.g.

// --node-snapshot-main=entry.js.

static Pointer BuiltinSnapshotData();

// Return an EmbedderSnapshotData object that is based on an input file.

// Calling this method will consume but not close the FILE* handle.

// The FILE* handle can be closed immediately following this call.

// If the snapshot is invalid, this returns an empty pointer.

static Pointer FromFile(FILE* in);

static Pointer FromBlob(const std::vector<char>& in);

static Pointer FromBlob(std::string_view in);

// Write this EmbedderSnapshotData object to an output file.

// Calling this method will not close the FILE* handle.

// The FILE* handle can be closed immediately following this call.

void ToFile(FILE* out) const;

std::vector<char> ToBlob() const;

// Returns whether custom snapshots can be used. Currently, this always

// returns false since V8 enforces shared readonly-heap.

static bool CanUseCustomSnapshotPerIsolate();

EmbedderSnapshotData(const EmbedderSnapshotData&) = delete;

EmbedderSnapshotData& operator=(const EmbedderSnapshotData&) = delete;

EmbedderSnapshotData(EmbedderSnapshotData&&) = delete;

EmbedderSnapshotData& operator=(EmbedderSnapshotData&&) = delete;

protected:

EmbedderSnapshotData(const SnapshotData* impl, bool owns_impl);

private:

const SnapshotData* impl_;

bool owns_impl_;

friend struct SnapshotData;

friend class CommonEnvironmentSetup;

};

// Overriding IsolateSettings may produce unexpected behavior

// in Node.js core functionality, so proceed at your own risk.

NODE_EXTERN void SetIsolateUpForNode(v8::Isolate* isolate,

const IsolateSettings& settings);

// Set a number of callbacks for the `isolate`, in particular the Node.js

// uncaught exception listener.

NODE_EXTERN void SetIsolateUpForNode(v8::Isolate* isolate);

// Creates a new isolate with Node.js-specific settings.

// This is a convenience method equivalent to using SetIsolateCreateParams(),

// Isolate::Allocate(), MultiIsolatePlatform::RegisterIsolate(),

// Isolate::Initialize(), and SetIsolateUpForNode().

NODE_EXTERN v8::Isolate* NewIsolate(

ArrayBufferAllocator* allocator,

struct uv_loop_s* event_loop,

MultiIsolatePlatform* platform,

const EmbedderSnapshotData* snapshot_data = nullptr,

const IsolateSettings& settings = {});

NODE_EXTERN v8::Isolate* NewIsolate(

std::shared_ptr<ArrayBufferAllocator> allocator,

struct uv_loop_s* event_loop,

MultiIsolatePlatform* platform,

const EmbedderSnapshotData* snapshot_data = nullptr,

const IsolateSettings& settings = {});

// Creates a new context with Node.js-specific tweaks.

// Call `RegisterContext` after the context been created to register

// the context with Node.js specific setups like the inspector.

NODE_EXTERN v8::Local<v8::Context> NewContext(

v8::Isolate* isolate,

v8::Local<v8::ObjectTemplate> object_template =

v8::Local<v8::ObjectTemplate>());

// Runs Node.js-specific tweaks on an already constructed context

// Return value indicates success of operation

NODE_EXTERN v8::Maybe<bool> InitializeContext(v8::Local<v8::Context> context);

// Associate the context with the given Environment. This registers the context

// as known to Node.js, makes it available to the inspector. This also registers

// Node.js promise hooks on the context.

NODE_EXTERN void RegisterContext(Environment* env,

v8::Local<v8::Context> context,

std::string_view name = "",

std::string_view origin = "");

// Unregister the context. Call this when the embedder finished all work with

// this context.

NODE_EXTERN void UnregisterContext(Environment* env,

v8::Local<v8::Context> context);

// If `platform` is passed, it will be used to register new Worker instances.

// It can be `nullptr`, in which case creating new Workers inside of

// Environments that use this `IsolateData` will not work.

NODE_EXTERN IsolateData* CreateIsolateData(

v8::Isolate* isolate,

struct uv_loop_s* loop,

MultiIsolatePlatform* platform = nullptr,

ArrayBufferAllocator* allocator = nullptr,

const EmbedderSnapshotData* snapshot_data = nullptr);

NODE_EXTERN void FreeIsolateData(IsolateData* isolate_data);

struct ThreadId {

uint64_t id = static_cast<uint64_t>(-1);

};

NODE_EXTERN ThreadId AllocateEnvironmentThreadId();

namespace EnvironmentFlags {

enum Flags : uint64_t {

kNoFlags = 0,

// Use the default behaviour for Node.js instances.

kDefaultFlags = 1 << 0,

// Controls whether this Environment is allowed to affect per-process state

// (e.g. cwd, process title, uid, etc.).

// This is set when using kDefaultFlags.

kOwnsProcessState = 1 << 1,

// Set if this Environment instance is associated with the global inspector

// handling code (i.e. listening on SIGUSR1).

// This is set when using kDefaultFlags.

kOwnsInspector = 1 << 2,

// Set if Node.js should not run its own esm loader. This is needed by some

// embedders, because it's possible for the Node.js esm loader to conflict

// with another one in an embedder environment, e.g. Blink's in Chromium.

kNoRegisterESMLoader = 1 << 3,

// Set this flag to make Node.js track "raw" file descriptors, i.e. managed

// by fs.open() and fs.close(), and close them during FreeEnvironment().

kTrackUnmanagedFds = 1 << 4,

// Set this flag to force hiding console windows when spawning child

// processes. This is usually used when embedding Node.js in GUI programs on

// Windows.

kHideConsoleWindows = 1 << 5,

// Set this flag to disable loading native addons via `process.dlopen`.

// This environment flag is especially important for worker threads

// so that a worker thread can't load a native addon even if `execArgv`

// is overwritten and `--no-addons` is not specified but was specified

// for this Environment instance.

kNoNativeAddons = 1 << 6,

// Set this flag to disable searching modules from global paths like

// $HOME/.node_modules and $NODE_PATH. This is used by standalone apps that

// do not expect to have their behaviors changed because of globally

// installed modules.

kNoGlobalSearchPaths = 1 << 7,

// Do not export browser globals like setTimeout, console, etc.

kNoBrowserGlobals = 1 << 8,

// Controls whether or not the Environment should call V8Inspector::create().

// This control is needed by embedders who may not want to initialize the V8

// inspector in situations where one has already been created,

// e.g. Blink's in Chromium.

kNoCreateInspector = 1 << 9,

// Controls whether or not the InspectorAgent for this Environment should

// call StartDebugSignalHandler. This control is needed by embedders who may

// not want to allow other processes to start the V8 inspector.

kNoStartDebugSignalHandler = 1 << 10,

// Controls whether the InspectorAgent created for this Environment waits for

// Inspector frontend events during the Environment creation. It's used to

// call node::Stop(env) on a Worker thread that is waiting for the events.

kNoWaitForInspectorFrontend = 1 << 11

};

} // namespace EnvironmentFlags

enum class SnapshotFlags : uint32_t {

kDefault = 0,

// Whether code cache should be generated as part of the snapshot.

// Code cache reduces the time spent on compiling functions included

// in the snapshot at the expense of a bigger snapshot size and

// potentially breaking portability of the snapshot.

kWithoutCodeCache = 1 << 0,

};

struct SnapshotConfig {

SnapshotFlags flags = SnapshotFlags::kDefault;

// When builder_script_path is std::nullopt, the snapshot is generated as a

// built-in snapshot instead of a custom one, and it's expected that the

// built-in snapshot only contains states that reproduce in every run of the

// application. The event loop won't be run when generating a built-in

// snapshot, so asynchronous operations should be avoided.

// When builder_script_path is an std::string, it should match args[1]

// passed to CreateForSnapshotting(). The embedder is also expected to use

// LoadEnvironment() to run a script matching this path. In that case the

// snapshot is generated as a custom snapshot and the event loop is run, so

// the snapshot builder can execute asynchronous operations as long as they

// are run to completion when the snapshot is taken.

std::optional<std::string> builder_script_path;

};

struct InspectorParentHandle {

virtual ~InspectorParentHandle() = default;

};

// TODO(addaleax): Maybe move per-Environment options parsing here.

// Returns nullptr when the Environment cannot be created e.g. there are

// pending JavaScript exceptions.

// `context` may be empty if an `EmbedderSnapshotData` instance was provided

// to `NewIsolate()` and `CreateIsolateData()`.

NODE_EXTERN Environment* CreateEnvironment(

IsolateData* isolate_data,

v8::Local<v8::Context> context,

const std::vector<std::string>& args,

const std::vector<std::string>& exec_args,

EnvironmentFlags::Flags flags = EnvironmentFlags::kDefaultFlags,

ThreadId thread_id = {} /* allocates a thread id automatically */,

std::unique_ptr<InspectorParentHandle> inspector_parent_handle = {},

std::string_view thread_name = {});

// Returns a handle that can be passed to `LoadEnvironment()`, making the

// child Environment accessible to the inspector as if it were a Node.js Worker.

// `child_thread_id` can be created using `AllocateEnvironmentThreadId()`

// and then later passed on to `CreateEnvironment()` to create the child

// Environment, together with the inspector handle.

// This method should not be called while the parent Environment is active

// on another thread.

NODE_EXTERN std::unique_ptr<InspectorParentHandle> GetInspectorParentHandle(

Environment* parent_env,

ThreadId child_thread_id,

const char* child_url);

NODE_EXTERN std::unique_ptr<InspectorParentHandle> GetInspectorParentHandle(

Environment* parent_env,

ThreadId child_thread_id,

const char* child_url,

const char* name);

NODE_EXTERN std::unique_ptr<InspectorParentHandle> GetInspectorParentHandle(

Environment* parent_env,

ThreadId child_thread_id,

std::string_view child_url,

std::string_view name);

struct StartExecutionCallbackInfo {

v8::Local<v8::Object> process_object;

v8::Local<v8::Function> native_require;

v8::Local<v8::Function> run_cjs;

};

enum class ModuleFormat : uint8_t {

kCommonJS,

kModule, // i.e. ES Module/SourceTextModule

// TODO(joyeecheung): support TypeScriptModule, TypeScriptCommonJS

};

// Information passed to embedder callbacks during environment startup.

// This class is created by Node.js and passed to the embedder's callback.

// The layout is opaque to allow future additions without breaking ABI.

class NODE_EXTERN StartExecutionCallbackInfoWithModule {

public:

StartExecutionCallbackInfoWithModule();

~StartExecutionCallbackInfoWithModule();

StartExecutionCallbackInfoWithModule(

const StartExecutionCallbackInfoWithModule&) = delete;

StartExecutionCallbackInfoWithModule& operator=(

const StartExecutionCallbackInfoWithModule&) = delete;

StartExecutionCallbackInfoWithModule(StartExecutionCallbackInfoWithModule&&);

StartExecutionCallbackInfoWithModule& operator=(

StartExecutionCallbackInfoWithModule&&);

Environment* env() const;

v8::Local<v8::Object> process_object() const;

v8::Local<v8::Function> native_require() const;

v8::Local<v8::Function> run_module() const;

void set_env(Environment* env);

void set_process_object(v8::Local<v8::Object> process_object);

void set_native_require(v8::Local<v8::Function> native_require);

void set_run_module(v8::Local<v8::Function> run_module);

private:

struct Impl;

std::unique_ptr<Impl> impl_;

};

using StartExecutionCallback =

std::function<v8::MaybeLocal<v8::Value>(const StartExecutionCallbackInfo&)>;

using StartExecutionCallbackWithModule =

std::function<v8::MaybeLocal<v8::Value>(

const StartExecutionCallbackInfoWithModule&)>;

using EmbedderPreloadCallback =

std::function<void(Environment* env,

v8::Local<v8::Value> process,

v8::Local<v8::Value> require)>;

// Run initialization for the environment.

// The |preload| function, usually used by embedders to inject scripts,

// will be run by Node.js before Node.js executes the entry point.

// The function is guaranteed to run before the user land module loader running

// any user code, so it is safe to assume that at this point, no user code has

// been run yet.

// The function will be executed with preload(process, require), and the passed

// require function has access to internal Node.js modules. There is no

// stability guarantee about the internals exposed to the internal require

// function. Expect breakages when updating Node.js versions if the embedder

// imports internal modules with the internal require function.

// Worker threads created in the environment will also respect The |preload|

// function, so make sure the function is thread-safe.

NODE_EXTERN v8::MaybeLocal<v8::Value> LoadEnvironment(

Environment* env,

StartExecutionCallback cb,

EmbedderPreloadCallback preload = nullptr);

NODE_EXTERN v8::MaybeLocal<v8::Value> LoadEnvironment(

Environment* env,

StartExecutionCallbackWithModule cb,

EmbedderPreloadCallback preload = nullptr);

NODE_EXTERN v8::MaybeLocal<v8::Value> LoadEnvironment(

Environment* env,

std::string_view main_script_source_utf8,

EmbedderPreloadCallback preload = nullptr);

// Data for specifying an entry point script for LoadEnvironment().

// This class uses an opaque layout to allow future additions without

// breaking ABI. Use the setter methods to configure the entry point.

class NODE_EXTERN ModuleData {

public:

ModuleData();

~ModuleData();

ModuleData(const ModuleData&) = delete;

ModuleData& operator=(const ModuleData&) = delete;

ModuleData(ModuleData&&);

ModuleData& operator=(ModuleData&&);

void set_source(std::string_view source);

void set_format(ModuleFormat format);

void set_resource_name(std::string_view name);

std::string_view source() const;

ModuleFormat format() const;

std::string_view resource_name() const;

private:

struct Impl;

std::unique_ptr<Impl> impl_;

};

NODE_EXTERN v8::MaybeLocal<v8::Value> LoadEnvironment(

Environment* env,

const ModuleData* entry_point,

EmbedderPreloadCallback preload = nullptr);

NODE_EXTERN void FreeEnvironment(Environment* env);

// Set a callback that is called when process.exit() is called from JS,

// overriding the default handler.

// It receives the Environment* instance and the exit code as arguments.

// This could e.g. call Stop(env); in order to terminate execution and stop

// the event loop.

// The default handler disposes of the global V8 platform instance, if one is

// being used, and calls exit().

NODE_EXTERN void SetProcessExitHandler(

Environment* env,

std::function<void(Environment*, int)>&& handler);

NODE_EXTERN void DefaultProcessExitHandler(Environment* env, int exit_code);

// Sets a process-global handler invoked when Node.js programmatically aborts.

// Nullable strings representing the location and reason for the abort may or

// may not be passed as a parameter to the handler. The handler should not

// return, but node will ensure that the process exits after the handler is

// called regardless of whether or not it returns. Passing nullptr restores the

// default handler. This is process-global and may be invoked before any Isolate

// or Environment exists.

using AbortHandler = void (*)(const char* location, const char* message);

NODE_EXTERN void SetAbortHandler(AbortHandler handler);

// This may return nullptr if context is not associated with a Node instance.

NODE_EXTERN Environment* GetCurrentEnvironment(v8::Local<v8::Context> context);

NODE_EXTERN IsolateData* GetEnvironmentIsolateData(Environment* env);

NODE_EXTERN ArrayBufferAllocator* GetArrayBufferAllocator(IsolateData* data);

// This is mostly useful for Environment* instances that were created through

// a snapshot and have a main context that was read from that snapshot.

NODE_EXTERN v8::Local<v8::Context> GetMainContext(Environment* env);

[[noreturn]] NODE_EXTERN void OnFatalError(const char* location,

const char* message);

NODE_EXTERN void PromiseRejectCallback(v8::PromiseRejectMessage message);

NODE_EXTERN bool AllowWasmCodeGenerationCallback(v8::Local<v8::Context> context,

v8::Local<v8::String>);

NODE_EXTERN bool ShouldAbortOnUncaughtException(v8::Isolate* isolate);

NODE_EXTERN v8::MaybeLocal<v8::Value> PrepareStackTraceCallback(

v8::Local<v8::Context> context,

v8::Local<v8::Value> exception,

v8::Local<v8::Array> trace);

// Writes a diagnostic report to a file. If filename is not provided, the

// default filename includes the date, time, PID, and a sequence number.

// The report's JavaScript stack trace is taken from err, if present.

// If isolate is nullptr, no information about the JavaScript environment

// is included in the report.

// Returns the filename of the written report.

NODE_EXTERN std::string TriggerNodeReport(v8::Isolate* isolate,

std::string_view message,

std::string_view trigger,

std::string_view filename,

v8::Local<v8::Value> error);

NODE_EXTERN std::string TriggerNodeReport(Environment* env,

std::string_view message,

std::string_view trigger,

std::string_view filename,

v8::Local<v8::Value> error);

NODE_EXTERN void GetNodeReport(v8::Isolate* isolate,

std::string_view message,

std::string_view trigger,

v8::Local<v8::Value> error,

std::ostream& out);

NODE_EXTERN void GetNodeReport(Environment* env,

std::string_view message,

std::string_view trigger,

v8::Local<v8::Value> error,

std::ostream& out);

// This returns the MultiIsolatePlatform used for an Environment or IsolateData

// instance, if one exists.

NODE_EXTERN MultiIsolatePlatform* GetMultiIsolatePlatform(Environment* env);

NODE_EXTERN MultiIsolatePlatform* GetMultiIsolatePlatform(IsolateData* env);

// Get/set the currently active tracing controller. Using

// MultiIsolatePlatform::Create() will implicitly set this by default. This is

// global and should be initialized along with the v8::Platform instance that is

// being used. `controller` is allowed to be `nullptr`. This is used for tracing

// events from Node.js itself. V8 uses the tracing controller returned from the

// active `v8::Platform` instance.

NODE_EXTERN v8::TracingController* GetTracingController();

NODE_EXTERN void SetTracingController(v8::TracingController* controller);

// Run `process.emit('beforeExit')` as it would usually happen when Node.js is

// run in standalone mode.

NODE_EXTERN v8::Maybe<bool> EmitProcessBeforeExit(Environment* env);

// Run `process.emit('exit')` as it would usually happen when Node.js is run

// in standalone mode. The return value corresponds to the exit code.

NODE_EXTERN v8::Maybe<int> EmitProcessExit(Environment* env);

// Runs hooks added through `AtExit()`. This is part of `FreeEnvironment()`,

// so calling it manually is typically not necessary.

NODE_EXTERN void RunAtExit(Environment* env);

// This may return nullptr if the current v8::Context is not associated

// with a Node instance.

NODE_EXTERN struct uv_loop_s* GetCurrentEventLoop(v8::Isolate* isolate);

// Runs the main loop for a given Environment. This roughly performs the

// following steps:

// 1. Call uv_run() on the event loop until it is drained.

// 2. Call platform->DrainTasks() on the associated platform/isolate.

// 3. If the event loop is alive again, go to Step 1.

// 4. Call EmitProcessBeforeExit().

// 5. If the event loop is alive again, go to Step 1.

// 6. Call EmitProcessExit() and forward the return value.

// If at any point node::Stop() is called, the function will attempt to return

// as soon as possible, returning an empty `Maybe`.

// This function only works if `env` has an associated `MultiIsolatePlatform`.

NODE_EXTERN v8::Maybe<int> SpinEventLoop(Environment* env);

NODE_EXTERN std::string GetAnonymousMainPath();

class NODE_EXTERN CommonEnvironmentSetup {

public:

~CommonEnvironmentSetup();

// Create a new CommonEnvironmentSetup, that is, a group of objects that

// together form the typical setup for a single Node.js Environment instance.

// If any error occurs, `*errors` will be populated and the returned pointer

// will be empty.

// env_args will be passed through as arguments to CreateEnvironment(), after

// `isolate_data` and `context`.

template <typename... EnvironmentArgs>

static std::unique_ptr<CommonEnvironmentSetup> Create(

MultiIsolatePlatform* platform,

std::vector<std::string>* errors,

EnvironmentArgs&&... env_args);

template <typename... EnvironmentArgs>

static std::unique_ptr<CommonEnvironmentSetup> CreateFromSnapshot(

MultiIsolatePlatform* platform,

std::vector<std::string>* errors,

const EmbedderSnapshotData* snapshot_data,

EnvironmentArgs&&... env_args);

// Create an embedding setup which will be used for creating a snapshot

// using CreateSnapshot().

// This will create and attach a v8::SnapshotCreator to this instance,

// and the same restrictions apply to this instance that also apply to

// other V8 snapshotting environments.

// Not all Node.js APIs are supported in this case. Currently, there is

// no support for native/host objects other than Node.js builtins

// in the snapshot.

// If the embedder wants to use LoadEnvironment() later to run a snapshot

// builder script they should make sure args[1] contains the path of the

// snapshot script, which will be used to create __filename and __dirname

// in the context where the builder script is run. If they do not want to

// include the build-time paths into the snapshot, use the string returned

// by GetAnonymousMainPath() as args[1] to anonymize the script.

// Snapshots are an *experimental* feature. In particular, the embedder API

// exposed through this class is subject to change or removal between Node.js

// versions, including possible API and ABI breakage.

static std::unique_ptr<CommonEnvironmentSetup> CreateForSnapshotting(

MultiIsolatePlatform* platform,

std::vector<std::string>* errors,

const std::vector<std::string>& args = {},

const std::vector<std::string>& exec_args = {},

const SnapshotConfig& snapshot_config = {});

EmbedderSnapshotData::Pointer CreateSnapshot();

struct uv_loop_s* event_loop() const;

v8::SnapshotCreator* snapshot_creator();

// Empty for snapshotting environments.

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