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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#include "jsi/jsi.h"
#include <cassert>
#include <cmath>
#include <cstdlib>
#include <stdexcept>
#include "jsi/instrumentation.h"
namespace facebook {
namespace jsi {
namespace {
// This is used for generating short exception strings.
std::string kindToString(const Value& v, Runtime* rt = nullptr) {
if (v.isUndefined()) {
return "undefined";
} else if (v.isNull()) {
return "null";
} else if (v.isBool()) {
return v.getBool() ? "true" : "false";
} else if (v.isNumber()) {
return "a number";
} else if (v.isString()) {
return "a string";
} else if (v.isSymbol()) {
return "a symbol";
} else if (v.isBigInt()) {
return "a bigint";
} else {
assert(v.isObject() && "Expecting object.");
return rt != nullptr && v.getObject(*rt).isFunction(*rt) ? "a function"
: "an object";
}
}
// getPropertyAsFunction() will try to create a JSError. If the
// failure is in building a JSError, this will lead to infinite
// recursion. This function is used in place of getPropertyAsFunction
// when building JSError, to avoid that infinite recursion.
Value callGlobalFunction(Runtime& runtime, const char* name, const Value& arg) {
Value v = runtime.global().getProperty(runtime, name);
if (!v.isObject()) {
throw JSINativeException(
std::string("callGlobalFunction: JS global property '") + name +
"' is " + kindToString(v, &runtime) + ", expected a Function");
}
Object o = v.getObject(runtime);
if (!o.isFunction(runtime)) {
throw JSINativeException(
std::string("callGlobalFunction: JS global property '") + name +
"' is a non-callable Object, expected a Function");
}
Function f = std::move(o).getFunction(runtime);
return f.call(runtime, arg);
}
// Given a sequence of UTF8 encoded bytes, advance the input to past where a
// 32-bit unicode codepoint as been decoded and return the codepoint. If the
// UTF8 encoding is invalid, then return the value with the unicode replacement
// character (U+FFFD). This decoder also relies on zero termination at end of
// the input for bound checks.
// \param input char pointer pointing to the current character
// \return Unicode codepoint
uint32_t decodeUTF8(const char*& input) {
uint32_t ch = (unsigned char)input[0];
if (ch <= 0x7f) {
input += 1;
return ch;
}
uint32_t ret;
constexpr uint32_t replacementCharacter = 0xFFFD;
if ((ch & 0xE0) == 0xC0) {
uint32_t ch1 = (unsigned char)input[1];
if ((ch1 & 0xC0) != 0x80) {
input += 1;
return replacementCharacter;
}
ret = ((ch & 0x1F) << 6) | (ch1 & 0x3F);
input += 2;
if (ret <= 0x7F) {
return replacementCharacter;
}
} else if ((ch & 0xF0) == 0xE0) {
uint32_t ch1 = (unsigned char)input[1];
if ((ch1 & 0x40) != 0 || (ch1 & 0x80) == 0) {
input += 1;
return replacementCharacter;
}
uint32_t ch2 = (unsigned char)input[2];
if ((ch2 & 0x40) != 0 || (ch2 & 0x80) == 0) {
input += 2;
return replacementCharacter;
}
ret = ((ch & 0x0F) << 12) | ((ch1 & 0x3F) << 6) | (ch2 & 0x3F);
input += 3;
if (ret <= 0x7FF) {
return replacementCharacter;
}
} else if ((ch & 0xF8) == 0xF0) {
uint32_t ch1 = (unsigned char)input[1];
if ((ch1 & 0x40) != 0 || (ch1 & 0x80) == 0) {
input += 1;
return replacementCharacter;
}
uint32_t ch2 = (unsigned char)input[2];
if ((ch2 & 0x40) != 0 || (ch2 & 0x80) == 0) {
input += 2;
return replacementCharacter;
}
uint32_t ch3 = (unsigned char)input[3];
if ((ch3 & 0x40) != 0 || (ch3 & 0x80) == 0) {
input += 3;
return replacementCharacter;
}
ret = ((ch & 0x07) << 18) | ((ch1 & 0x3F) << 12) | ((ch2 & 0x3F) << 6) |
(ch3 & 0x3F);
input += 4;
if (ret <= 0xFFFF) {
return replacementCharacter;
}
if (ret > 0x10FFFF) {
return replacementCharacter;
}
} else {
input += 1;
return replacementCharacter;
}
return ret;
}
// Given a valid 32-bit unicode codepoint, encode it as UTF-16 into the output.
void encodeUTF16(std::u16string& out, uint32_t cp) {
if (cp < 0x10000) {
out.push_back((uint16_t)cp);
return;
}
cp -= 0x10000;
uint16_t highSurrogate = 0xD800 + ((cp >> 10) & 0x3FF);
out.push_back(highSurrogate);
uint16_t lowSurrogate = 0xDC00 + (cp & 0x3FF);
out.push_back(lowSurrogate);
}
// Convert the UTF8 encoded string into a UTF16 encoded string. If the
// input is not valid UTF8, the replacement character (U+FFFD) is used to
// represent the invalid sequence.
std::u16string convertUTF8ToUTF16(const std::string& utf8) {
std::u16string ret;
const char* curr = utf8.data();
const char* end = curr + utf8.length();
while (curr < end) {
auto cp = decodeUTF8(curr);
encodeUTF16(ret, cp);
}
return ret;
}
} // namespace
Buffer::~Buffer() = default;
MutableBuffer::~MutableBuffer() = default;
PreparedJavaScript::~PreparedJavaScript() = default;
Value HostObject::get(Runtime&, const PropNameID&) { return Value(); }
void HostObject::set(Runtime& rt, const PropNameID& name, const Value&) {
std::string msg("TypeError: Cannot assign to property '");
msg += name.utf8(rt);
msg += "' on HostObject with default setter";
throw JSError(rt, msg);
}
HostObject::~HostObject() {}
NativeState::~NativeState() {}
Runtime::~Runtime() {}
Instrumentation& Runtime::instrumentation() {
class NoInstrumentation : public Instrumentation {
std::string getRecordedGCStats() override { return ""; }
std::unordered_map<std::string, int64_t> getHeapInfo(bool) override {
return std::unordered_map<std::string, int64_t>{};
}
void collectGarbage(std::string) override {}
void startTrackingHeapObjectStackTraces(
std::function<void(uint64_t, std::chrono::microseconds,
std::vector<HeapStatsUpdate>)>) override {}
void stopTrackingHeapObjectStackTraces() override {}
void startHeapSampling(size_t) override {}
void stopHeapSampling(std::ostream&) override {}
void createSnapshotToFile(const std::string& /*path*/,
const HeapSnapshotOptions& /*options*/) override {
throw JSINativeException(
"Default instrumentation cannot create a heap snapshot");
}
void createSnapshotToStream(
std::ostream& /*os*/, const HeapSnapshotOptions& /*options*/) override {
throw JSINativeException(
"Default instrumentation cannot create a heap snapshot");
}
std::string flushAndDisableBridgeTrafficTrace() override { std::abort(); }
void writeBasicBlockProfileTraceToFile(const std::string&) const override {
std::abort();
}
void dumpProfilerSymbolsToFile(const std::string&) const override {
std::abort();
}
};
static NoInstrumentation sharedInstance;
return sharedInstance;
}
Value Runtime::createValueFromJsonUtf8(const uint8_t* json, size_t length) {
Function parseJson = global()
.getPropertyAsObject(*this, "JSON")
.getPropertyAsFunction(*this, "parse");
return parseJson.call(*this, String::createFromUtf8(*this, json, length));
}
std::u16string Runtime::utf16(const PropNameID& sym) {
auto utf8Str = utf8(sym);
return convertUTF8ToUTF16(utf8Str);
}
std::u16string Runtime::utf16(const String& str) {
auto utf8Str = utf8(str);
return convertUTF8ToUTF16(utf8Str);
}
void Runtime::getStringData(const jsi::String& str, void* ctx,
void (*cb)(void* ctx, bool ascii, const void* data,
size_t num)) {
auto utf16Str = utf16(str);
cb(ctx, false, utf16Str.data(), utf16Str.size());
}
void Runtime::getPropNameIdData(const jsi::PropNameID& sym, void* ctx,
void (*cb)(void* ctx, bool ascii,
const void* data, size_t num)) {
auto utf16Str = utf16(sym);
cb(ctx, false, utf16Str.data(), utf16Str.size());
}
void Runtime::setPrototypeOf(const Object& object, const Value& prototype) {
auto setPrototypeOfFn = global()
.getPropertyAsObject(*this, "Object")
.getPropertyAsFunction(*this, "setPrototypeOf");
setPrototypeOfFn.call(*this, object, prototype).asObject(*this);
}
Value Runtime::getPrototypeOf(const Object& object) {
auto setPrototypeOfFn = global()
.getPropertyAsObject(*this, "Object")
.getPropertyAsFunction(*this, "getPrototypeOf");
return setPrototypeOfFn.call(*this, object);
}
Object Runtime::createObjectWithPrototype(const Value& prototype) {
auto createFn = global()
.getPropertyAsObject(*this, "Object")
.getPropertyAsFunction(*this, "create");
return createFn.call(*this, prototype).asObject(*this);
}
Pointer& Pointer::operator=(Pointer&& other) noexcept {
if (ptr_) {
ptr_->invalidate();
}
ptr_ = other.ptr_;
other.ptr_ = nullptr;
return *this;
}
Object Object::getPropertyAsObject(Runtime& runtime, const char* name) const {
Value v = getProperty(runtime, name);
if (!v.isObject()) {
throw JSError(runtime, std::string("getPropertyAsObject: property '") +
name + "' is " + kindToString(v, &runtime) +
", expected an Object");
}
return v.getObject(runtime);
}
Function Object::getPropertyAsFunction(Runtime& runtime,
const char* name) const {
Object obj = getPropertyAsObject(runtime, name);
if (!obj.isFunction(runtime)) {
throw JSError(runtime, std::string("getPropertyAsFunction: property '") +
name + "' is " +
kindToString(std::move(obj), &runtime) +
", expected a Function");
};
return std::move(obj).getFunction(runtime);
}
Array Object::asArray(Runtime& runtime) const& {
if (!isArray(runtime)) {
throw JSError(runtime, "Object is " +
kindToString(Value(runtime, *this), &runtime) +
", expected an array");
}
return getArray(runtime);
}
Array Object::asArray(Runtime& runtime) && {
if (!isArray(runtime)) {
throw JSError(runtime, "Object is " +
kindToString(Value(runtime, *this), &runtime) +
", expected an array");
}
return std::move(*this).getArray(runtime);
}
Function Object::asFunction(Runtime& runtime) const& {
if (!isFunction(runtime)) {
throw JSError(runtime, "Object is " +
kindToString(Value(runtime, *this), &runtime) +
", expected a function");
}
return getFunction(runtime);
}
Function Object::asFunction(Runtime& runtime) && {
if (!isFunction(runtime)) {
throw JSError(runtime, "Object is " +
kindToString(Value(runtime, *this), &runtime) +
", expected a function");
}
return std::move(*this).getFunction(runtime);
}
Value::Value(Value&& other) noexcept : Value(other.kind_) {
if (kind_ == BooleanKind) {
data_.boolean = other.data_.boolean;
} else if (kind_ == NumberKind) {
data_.number = other.data_.number;
} else if (kind_ >= PointerKind) {
new (&data_.pointer) Pointer(std::move(other.data_.pointer));
}
// when the other's dtor runs, nothing will happen.
other.kind_ = UndefinedKind;
}
Value::Value(Runtime& runtime, const Value& other) : Value(other.kind_) {
// data_ is uninitialized, so use placement new to create non-POD
// types in it. Any other kind of initialization will call a dtor
// first, which is incorrect.
if (kind_ == BooleanKind) {
data_.boolean = other.data_.boolean;
} else if (kind_ == NumberKind) {
data_.number = other.data_.number;
} else if (kind_ == SymbolKind) {
new (&data_.pointer) Pointer(runtime.cloneSymbol(other.data_.pointer.ptr_));
} else if (kind_ == BigIntKind) {
new (&data_.pointer) Pointer(runtime.cloneBigInt(other.data_.pointer.ptr_));
} else if (kind_ == StringKind) {
new (&data_.pointer) Pointer(runtime.cloneString(other.data_.pointer.ptr_));
} else if (kind_ >= ObjectKind) {
new (&data_.pointer) Pointer(runtime.cloneObject(other.data_.pointer.ptr_));
}
}
Value::~Value() {
if (kind_ >= PointerKind) {
data_.pointer.~Pointer();
}
}
bool Value::strictEquals(Runtime& runtime, const Value& a, const Value& b) {
if (a.kind_ != b.kind_) {
return false;
}
switch (a.kind_) {
case UndefinedKind:
case NullKind:
return true;
case BooleanKind:
return a.data_.boolean == b.data_.boolean;
case NumberKind:
return a.data_.number == b.data_.number;
case SymbolKind:
return runtime.strictEquals(static_cast<const Symbol&>(a.data_.pointer),
static_cast<const Symbol&>(b.data_.pointer));
case BigIntKind:
return runtime.strictEquals(static_cast<const BigInt&>(a.data_.pointer),
static_cast<const BigInt&>(b.data_.pointer));
case StringKind:
return runtime.strictEquals(static_cast<const String&>(a.data_.pointer),
static_cast<const String&>(b.data_.pointer));
case ObjectKind:
return runtime.strictEquals(static_cast<const Object&>(a.data_.pointer),
static_cast<const Object&>(b.data_.pointer));
}
return false;
}
bool Value::asBool() const {
if (!isBool()) {
throw JSINativeException("Value is " + kindToString(*this) +
", expected a boolean");
}
return getBool();
}
double Value::asNumber() const {
if (!isNumber()) {
throw JSINativeException("Value is " + kindToString(*this) +
", expected a number");
}
return getNumber();
}
Object Value::asObject(Runtime& rt) const& {
if (!isObject()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected an Object");
}
return getObject(rt);
}
Object Value::asObject(Runtime& rt) && {
if (!isObject()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected an Object");
}
auto ptr = data_.pointer.ptr_;
data_.pointer.ptr_ = nullptr;
return static_cast<Object>(ptr);
}
Symbol Value::asSymbol(Runtime& rt) const& {
if (!isSymbol()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected a Symbol");
}
return getSymbol(rt);
}
Symbol Value::asSymbol(Runtime& rt) && {
if (!isSymbol()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected a Symbol");
}
return std::move(*this).getSymbol(rt);
}
BigInt Value::asBigInt(Runtime& rt) const& {
if (!isBigInt()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected a BigInt");
}
return getBigInt(rt);
}
BigInt Value::asBigInt(Runtime& rt) && {
if (!isBigInt()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected a BigInt");
}
return std::move(*this).getBigInt(rt);
}
String Value::asString(Runtime& rt) const& {
if (!isString()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected a String");
}
return getString(rt);
}
String Value::asString(Runtime& rt) && {
if (!isString()) {
throw JSError(
rt, "Value is " + kindToString(*this, &rt) + ", expected a String");
}
return std::move(*this).getString(rt);
}
String Value::toString(Runtime& runtime) const {
Function toString = runtime.global().getPropertyAsFunction(runtime, "String");
return toString.call(runtime, *this).getString(runtime);
}
uint64_t BigInt::asUint64(Runtime& runtime) const {
if (!isUint64(runtime)) {
throw JSError(runtime, "Lossy truncation in BigInt64::asUint64");
}
return getUint64(runtime);
}
int64_t BigInt::asInt64(Runtime& runtime) const {
if (!isInt64(runtime)) {
throw JSError(runtime, "Lossy truncation in BigInt64::asInt64");
}
return getInt64(runtime);
}
Array Array::createWithElements(Runtime& rt,
std::initializer_list<Value> elements) {
Array result(rt, elements.size());
size_t index = 0;
for (const auto& element : elements) {
result.setValueAtIndex(rt, index++, element);
}
return result;
}
std::vector<PropNameID> HostObject::getPropertyNames(Runtime&) { return {}; }
Runtime::ScopeState* Runtime::pushScope() { return nullptr; }
void Runtime::popScope(ScopeState*) {}
JSError::JSError(Runtime& rt, Value&& value) { setValue(rt, std::move(value)); }
JSError::JSError(Runtime& rt, std::string msg) : message_(std::move(msg)) {
try {
setValue(rt, callGlobalFunction(rt, "Error",
String::createFromUtf8(rt, message_)));
} catch (const JSIException& ex) {
message_ = std::string(ex.what()) + " (while raising " + message_ + ")";
setValue(rt, String::createFromUtf8(rt, message_));
}
}
JSError::JSError(Runtime& rt, std::string msg, std::string stack)
: message_(std::move(msg)), stack_(std::move(stack)) {
try {
Object e(rt);
e.setProperty(rt, "message", String::createFromUtf8(rt, message_));
e.setProperty(rt, "stack", String::createFromUtf8(rt, stack_));
setValue(rt, std::move(e));
} catch (const JSIException& ex) {
setValue(rt, String::createFromUtf8(rt, ex.what()));
}
}
JSError::JSError(std::string what, Runtime& rt, Value&& value)
: JSIException(std::move(what)) {
setValue(rt, std::move(value));
}
JSError::JSError(Value&& value, std::string message, std::string stack)
: JSIException(message + "\n\n" + stack),
value_(std::make_shared<Value>(std::move(value))),
message_(std::move(message)),
stack_(std::move(stack)) {}
void JSError::setValue(Runtime& rt, Value&& value) {
value_ = std::make_shared<Value>(std::move(value));
if ((message_.empty() || stack_.empty()) && value_->isObject()) {
auto obj = value_->getObject(rt);
if (message_.empty()) {
try {
Value message = obj.getProperty(rt, "message");
if (!message.isUndefined() && !message.isString()) {
message = callGlobalFunction(rt, "String", message);
}
if (message.isString()) {
message_ = message.getString(rt).utf8(rt);
} else if (!message.isUndefined()) {
message_ = "String(e.message) is a " + kindToString(message, &rt);
}
} catch (const JSIException& ex) {
message_ = std::string("[Exception while creating message string: ") +
ex.what() + "]";
}
}
if (stack_.empty()) {
try {
Value stack = obj.getProperty(rt, "stack");
if (!stack.isUndefined() && !stack.isString()) {
stack = callGlobalFunction(rt, "String", stack);
}
if (stack.isString()) {
stack_ = stack.getString(rt).utf8(rt);
} else if (!stack.isUndefined()) {
stack_ = "String(e.stack) is a " + kindToString(stack, &rt);
}
} catch (const JSIException& ex) {
message_ = std::string("[Exception while creating stack string: ") +
ex.what() + "]";
}
}
}
if (message_.empty()) {
try {
if (value_->isString()) {
message_ = value_->getString(rt).utf8(rt);
} else {
Value message = callGlobalFunction(rt, "String", *value_);
if (message.isString()) {
message_ = message.getString(rt).utf8(rt);
} else {
message_ = "String(e) is a " + kindToString(message, &rt);
}
}
} catch (const JSIException& ex) {
message_ = std::string("[Exception while creating message string: ") +
ex.what() + "]";
}
}
if (stack_.empty()) {
stack_ = "no stack";
}
if (what_.empty()) {
what_ = message_ + "\n\n" + stack_;
}
}
JSIException::~JSIException() {}
JSINativeException::~JSINativeException() {}
JSError::~JSError() {}
} // namespace jsi
} // namespace facebook