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js.cpp
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js.cpp
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/*
* Copyright (c) 2020-2021, Andreas Kling <[email protected]>
* Copyright (c) 2020-2021, Linus Groh <[email protected]>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <AK/Format.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/StringBuilder.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/StandardPaths.h>
#include <LibJS/AST.h>
#include <LibJS/Bytecode/BasicBlock.h>
#include <LibJS/Bytecode/Generator.h>
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Bytecode/PassManager.h>
#include <LibJS/Console.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Parser.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/BooleanObject.h>
#include <LibJS/Runtime/DataView.h>
#include <LibJS/Runtime/Date.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/FunctionObject.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Intl/DisplayNames.h>
#include <LibJS/Runtime/Intl/Locale.h>
#include <LibJS/Runtime/Map.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/NumberObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/OrdinaryFunctionObject.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Promise.h>
#include <LibJS/Runtime/ProxyObject.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Set.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/StringObject.h>
#include <LibJS/Runtime/Temporal/Calendar.h>
#include <LibJS/Runtime/Temporal/Duration.h>
#include <LibJS/Runtime/Temporal/Instant.h>
#include <LibJS/Runtime/Temporal/PlainDate.h>
#include <LibJS/Runtime/Temporal/PlainDateTime.h>
#include <LibJS/Runtime/Temporal/PlainTime.h>
#include <LibJS/Runtime/Temporal/PlainYearMonth.h>
#include <LibJS/Runtime/Temporal/TimeZone.h>
#include <LibJS/Runtime/Temporal/ZonedDateTime.h>
#include <LibJS/Runtime/TypedArray.h>
#include <LibJS/Runtime/Value.h>
#include <LibLine/Editor.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
RefPtr<JS::VM> vm;
Vector<String> repl_statements;
class ReplObject final : public JS::GlobalObject {
JS_OBJECT(ReplObject, JS::GlobalObject);
public:
ReplObject() = default;
virtual void initialize_global_object() override;
virtual ~ReplObject() override = default;
private:
JS_DECLARE_NATIVE_FUNCTION(exit_interpreter);
JS_DECLARE_NATIVE_FUNCTION(repl_help);
JS_DECLARE_NATIVE_FUNCTION(load_file);
JS_DECLARE_NATIVE_FUNCTION(save_to_file);
};
class ScriptObject final : public JS::GlobalObject {
JS_OBJECT(ScriptObject, JS::GlobalObject);
public:
ScriptObject() = default;
virtual void initialize_global_object() override;
virtual ~ScriptObject() override = default;
private:
JS_DECLARE_NATIVE_FUNCTION(load_file);
};
static bool s_dump_ast = false;
static bool s_dump_bytecode = false;
static bool s_run_bytecode = false;
static bool s_opt_bytecode = false;
static bool s_as_module = false;
static bool s_print_last_result = false;
static RefPtr<Line::Editor> s_editor;
static String s_history_path = String::formatted("{}/.js-history", Core::StandardPaths::home_directory());
static int s_repl_line_level = 0;
static bool s_fail_repl = false;
static String prompt_for_level(int level)
{
static StringBuilder prompt_builder;
prompt_builder.clear();
prompt_builder.append("> ");
for (auto i = 0; i < level; ++i)
prompt_builder.append(" ");
return prompt_builder.build();
}
static String read_next_piece()
{
StringBuilder piece;
auto line_level_delta_for_next_line { 0 };
do {
auto line_result = s_editor->get_line(prompt_for_level(s_repl_line_level));
line_level_delta_for_next_line = 0;
if (line_result.is_error()) {
s_fail_repl = true;
return "";
}
auto& line = line_result.value();
s_editor->add_to_history(line);
piece.append(line);
piece.append('\n');
auto lexer = JS::Lexer(line);
enum {
NotInLabelOrObjectKey,
InLabelOrObjectKeyIdentifier,
InLabelOrObjectKey
} label_state { NotInLabelOrObjectKey };
for (JS::Token token = lexer.next(); token.type() != JS::TokenType::Eof; token = lexer.next()) {
switch (token.type()) {
case JS::TokenType::BracketOpen:
case JS::TokenType::CurlyOpen:
case JS::TokenType::ParenOpen:
label_state = NotInLabelOrObjectKey;
s_repl_line_level++;
break;
case JS::TokenType::BracketClose:
case JS::TokenType::CurlyClose:
case JS::TokenType::ParenClose:
label_state = NotInLabelOrObjectKey;
s_repl_line_level--;
break;
case JS::TokenType::Identifier:
case JS::TokenType::StringLiteral:
if (label_state == NotInLabelOrObjectKey)
label_state = InLabelOrObjectKeyIdentifier;
else
label_state = NotInLabelOrObjectKey;
break;
case JS::TokenType::Colon:
if (label_state == InLabelOrObjectKeyIdentifier)
label_state = InLabelOrObjectKey;
else
label_state = NotInLabelOrObjectKey;
break;
default:
break;
}
}
if (label_state == InLabelOrObjectKey) {
// If there's a label or object literal key at the end of this line,
// prompt for more lines but do not change the line level.
line_level_delta_for_next_line += 1;
}
} while (s_repl_line_level + line_level_delta_for_next_line > 0);
return piece.to_string();
}
static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects);
static void print_type(FlyString const& name)
{
out("[\033[36;1m{}\033[0m]", name);
}
static void print_separator(bool& first)
{
out(first ? " " : ", ");
first = false;
}
static void print_array(JS::Array& array, HashTable<JS::Object*>& seen_objects)
{
out("[");
bool first = true;
for (auto it = array.indexed_properties().begin(false); it != array.indexed_properties().end(); ++it) {
print_separator(first);
auto value = array.get(it.index());
// The V8 repl doesn't throw an exception here, and instead just
// prints 'undefined'. We may choose to replicate that behavior in
// the future, but for now lets just catch the error
if (vm->exception())
return;
print_value(value, seen_objects);
}
if (!first)
out(" ");
out("]");
}
static void print_object(JS::Object& object, HashTable<JS::Object*>& seen_objects)
{
out("{{");
bool first = true;
for (auto& entry : object.indexed_properties()) {
print_separator(first);
out("\"\033[33;1m{}\033[0m\": ", entry.index());
auto value = object.get(entry.index());
// The V8 repl doesn't throw an exception here, and instead just
// prints 'undefined'. We may choose to replicate that behavior in
// the future, but for now lets just catch the error
if (vm->exception())
return;
print_value(value, seen_objects);
}
for (auto& it : object.shape().property_table_ordered()) {
print_separator(first);
if (it.key.is_string()) {
out("\"\033[33;1m{}\033[0m\": ", it.key.to_display_string());
} else {
out("[\033[33;1m{}\033[0m]: ", it.key.to_display_string());
}
print_value(object.get_direct(it.value.offset), seen_objects);
}
if (!first)
out(" ");
out("}}");
}
static void print_function(JS::Object const& object, HashTable<JS::Object*>&)
{
print_type(object.class_name());
if (is<JS::OrdinaryFunctionObject>(object))
out(" {}", static_cast<JS::OrdinaryFunctionObject const&>(object).name());
else if (is<JS::NativeFunction>(object))
out(" {}", static_cast<JS::NativeFunction const&>(object).name());
}
static void print_date(JS::Object const& object, HashTable<JS::Object*>&)
{
print_type("Date");
out(" \033[34;1m{}\033[0m", static_cast<JS::Date const&>(object).string());
}
static void print_error(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto name = object.get_without_side_effects(vm->names.name).value_or(JS::js_undefined());
auto message = object.get_without_side_effects(vm->names.message).value_or(JS::js_undefined());
if (name.is_accessor() || message.is_accessor()) {
print_value(&object, seen_objects);
} else {
auto name_string = name.to_string_without_side_effects();
auto message_string = message.to_string_without_side_effects();
print_type(name_string);
if (!message_string.is_empty())
out(" \033[31;1m{}\033[0m", message_string);
}
}
static void print_regexp_object(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& regexp_object = static_cast<JS::RegExpObject const&>(object);
// Use RegExp.prototype.source rather than RegExpObject::pattern() so we get proper escaping
auto source = regexp_object.get("source").to_primitive_string(object.global_object())->string();
print_type("RegExp");
out(" \033[34;1m/{}/{}\033[0m", source, regexp_object.flags());
}
static void print_proxy_object(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& proxy_object = static_cast<JS::ProxyObject const&>(object);
print_type("Proxy");
out("\n target: ");
print_value(&proxy_object.target(), seen_objects);
out("\n handler: ");
print_value(&proxy_object.handler(), seen_objects);
}
static void print_map(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& map = static_cast<JS::Map const&>(object);
auto& entries = map.entries();
print_type("Map");
out(" {{");
bool first = true;
for (auto& entry : entries) {
print_separator(first);
print_value(entry.key, seen_objects);
out(" => ");
print_value(entry.value, seen_objects);
}
if (!first)
out(" ");
out("}}");
}
static void print_set(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& set = static_cast<JS::Set const&>(object);
auto& values = set.values();
print_type("Set");
out(" {{");
bool first = true;
for (auto& value : values) {
print_separator(first);
print_value(value, seen_objects);
}
if (!first)
out(" ");
out("}}");
}
static void print_promise(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& promise = static_cast<JS::Promise const&>(object);
print_type("Promise");
switch (promise.state()) {
case JS::Promise::State::Pending:
out("\n state: ");
out("\033[36;1mPending\033[0m");
break;
case JS::Promise::State::Fulfilled:
out("\n state: ");
out("\033[32;1mFulfilled\033[0m");
out("\n result: ");
print_value(promise.result(), seen_objects);
break;
case JS::Promise::State::Rejected:
out("\n state: ");
out("\033[31;1mRejected\033[0m");
out("\n result: ");
print_value(promise.result(), seen_objects);
break;
default:
VERIFY_NOT_REACHED();
}
}
static void print_array_buffer(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& array_buffer = static_cast<JS::ArrayBuffer const&>(object);
auto& buffer = array_buffer.buffer();
auto byte_length = array_buffer.byte_length();
print_type("ArrayBuffer");
out("\n byteLength: ");
print_value(JS::Value((double)byte_length), seen_objects);
if (!byte_length)
return;
outln();
for (size_t i = 0; i < byte_length; ++i) {
out("{:02x}", buffer[i]);
if (i + 1 < byte_length) {
if ((i + 1) % 32 == 0)
outln();
else if ((i + 1) % 16 == 0)
out(" ");
else
out(" ");
}
}
}
template<typename T>
static void print_number(T number) requires IsArithmetic<T>
{
out("\033[35;1m");
out("{}", number);
out("\033[0m");
}
static void print_typed_array(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& typed_array_base = static_cast<JS::TypedArrayBase const&>(object);
auto& array_buffer = *typed_array_base.viewed_array_buffer();
auto length = typed_array_base.array_length();
print_type(object.class_name());
out("\n length: ");
print_value(JS::Value(length), seen_objects);
out("\n byteLength: ");
print_value(JS::Value(typed_array_base.byte_length()), seen_objects);
out("\n buffer: ");
print_type("ArrayBuffer");
if (array_buffer.is_detached())
out(" (detached)");
out(" @ {:p}", &array_buffer);
if (!length || array_buffer.is_detached())
return;
outln();
// FIXME: This kinda sucks.
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
if (is<JS::ClassName>(object)) { \
out("[ "); \
auto& typed_array = static_cast<JS::ClassName const&>(typed_array_base); \
auto data = typed_array.data(); \
for (size_t i = 0; i < length; ++i) { \
if (i > 0) \
out(", "); \
print_number(data[i]); \
} \
out(" ]"); \
return; \
}
JS_ENUMERATE_TYPED_ARRAYS
#undef __JS_ENUMERATE
VERIFY_NOT_REACHED();
}
static void print_data_view(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& data_view = static_cast<JS::DataView const&>(object);
print_type("DataView");
out("\n byteLength: ");
print_value(JS::Value(data_view.byte_length()), seen_objects);
out("\n byteOffset: ");
print_value(JS::Value(data_view.byte_offset()), seen_objects);
out("\n buffer: ");
print_type("ArrayBuffer");
out(" @ {:p}", data_view.viewed_array_buffer());
}
static void print_temporal_calendar(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& calendar = static_cast<JS::Temporal::Calendar const&>(object);
print_type("Temporal.Calendar");
out(" ");
print_value(JS::js_string(object.vm(), calendar.identifier()), seen_objects);
}
static void print_temporal_duration(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& duration = static_cast<JS::Temporal::Duration const&>(object);
print_type("Temporal.Duration");
out(" \033[34;1m{} y, {} M, {} w, {} d, {} h, {} m, {} s, {} ms, {} us, {} ns\033[0m", duration.years(), duration.months(), duration.weeks(), duration.days(), duration.hours(), duration.minutes(), duration.seconds(), duration.milliseconds(), duration.microseconds(), duration.nanoseconds());
}
static void print_temporal_instant(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& instant = static_cast<JS::Temporal::Instant const&>(object);
print_type("Temporal.Instant");
out(" ");
// FIXME: Print human readable date and time, like in print_date() - ideally handling arbitrarily large values since we get a bigint.
print_value(&instant.nanoseconds(), seen_objects);
}
static void print_temporal_plain_date(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& plain_date = static_cast<JS::Temporal::PlainDate const&>(object);
print_type("Temporal.PlainDate");
out(" \033[34;1m{:04}-{:02}-{:02}\033[0m", plain_date.iso_year(), plain_date.iso_month(), plain_date.iso_day());
}
static void print_temporal_plain_date_time(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& plain_date_time = static_cast<JS::Temporal::PlainDateTime const&>(object);
print_type("Temporal.PlainDateTime");
out(" \033[34;1m{:04}-{:02}-{:02} {:02}:{:02}:{:02}.{:03}{:03}{:03}\033[0m", plain_date_time.iso_year(), plain_date_time.iso_month(), plain_date_time.iso_day(), plain_date_time.iso_hour(), plain_date_time.iso_minute(), plain_date_time.iso_second(), plain_date_time.iso_millisecond(), plain_date_time.iso_microsecond(), plain_date_time.iso_nanosecond());
}
static void print_temporal_plain_time(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& plain_time = static_cast<JS::Temporal::PlainTime const&>(object);
print_type("Temporal.PlainTime");
out(" \033[34;1m{:02}:{:02}:{:02}.{:03}{:03}{:03}\033[0m", plain_time.iso_hour(), plain_time.iso_minute(), plain_time.iso_second(), plain_time.iso_millisecond(), plain_time.iso_microsecond(), plain_time.iso_nanosecond());
}
static void print_temporal_plain_year_month(JS::Object const& object, HashTable<JS::Object*>&)
{
auto& plain_year_month = static_cast<JS::Temporal::PlainYearMonth const&>(object);
print_type("Temporal.PlainYearMonth");
// Also has an [[ISODay]] internal slot, but showing that here seems rather unexpected.
out(" \033[34;1m{:04}-{:02}\033[0m", plain_year_month.iso_year(), plain_year_month.iso_month());
}
static void print_temporal_time_zone(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& time_zone = static_cast<JS::Temporal::TimeZone const&>(object);
print_type("Temporal.TimeZone");
out(" ");
print_value(JS::js_string(object.vm(), time_zone.identifier()), seen_objects);
if (time_zone.offset_nanoseconds().has_value()) {
out("\n offset (ns): ");
print_value(JS::Value(*time_zone.offset_nanoseconds()), seen_objects);
}
}
static void print_temporal_zoned_date_time(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& zoned_date_time = static_cast<JS::Temporal::ZonedDateTime const&>(object);
print_type("Temporal.ZonedDateTime");
out("\n epochNanoseconds: ");
print_value(&zoned_date_time.nanoseconds(), seen_objects);
out("\n timeZone: ");
print_value(&zoned_date_time.time_zone(), seen_objects);
out("\n calendar: ");
print_value(&zoned_date_time.calendar(), seen_objects);
}
static void print_intl_display_names(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& display_names = static_cast<JS::Intl::DisplayNames const&>(object);
print_type("Intl.DisplayNames");
out("\n locale: ");
print_value(js_string(object.vm(), display_names.locale()), seen_objects);
out("\n type: ");
print_value(js_string(object.vm(), display_names.type_string()), seen_objects);
out("\n style: ");
print_value(js_string(object.vm(), display_names.style_string()), seen_objects);
out("\n fallback: ");
print_value(js_string(object.vm(), display_names.fallback_string()), seen_objects);
}
static void print_intl_locale(JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
auto& locale = static_cast<JS::Intl::Locale const&>(object);
print_type("Intl.Locale");
out("\n locale: ");
print_value(js_string(object.vm(), locale.locale()), seen_objects);
if (locale.has_calendar()) {
out("\n calendar: ");
print_value(js_string(object.vm(), locale.calendar()), seen_objects);
}
if (locale.has_case_first()) {
out("\n caseFirst: ");
print_value(js_string(object.vm(), locale.case_first()), seen_objects);
}
if (locale.has_collation()) {
out("\n collation: ");
print_value(js_string(object.vm(), locale.collation()), seen_objects);
}
if (locale.has_hour_cycle()) {
out("\n hourCycle: ");
print_value(js_string(object.vm(), locale.hour_cycle()), seen_objects);
}
if (locale.has_numbering_system()) {
out("\n numberingSystem: ");
print_value(js_string(object.vm(), locale.numbering_system()), seen_objects);
}
out("\n numeric: ");
print_value(JS::Value(locale.numeric()), seen_objects);
}
static void print_primitive_wrapper_object(FlyString const& name, JS::Object const& object, HashTable<JS::Object*>& seen_objects)
{
// BooleanObject, NumberObject, StringObject
print_type(name);
out(" ");
print_value(object.value_of(), seen_objects);
}
static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects)
{
if (value.is_empty()) {
out("\033[34;1m<empty>\033[0m");
return;
}
if (value.is_object()) {
if (seen_objects.contains(&value.as_object())) {
// FIXME: Maybe we should only do this for circular references,
// not for all reoccurring objects.
out("<already printed Object {}>", &value.as_object());
return;
}
seen_objects.set(&value.as_object());
}
if (value.is_object()) {
auto& object = value.as_object();
if (is<JS::Array>(object))
return print_array(static_cast<JS::Array&>(object), seen_objects);
if (object.is_function())
return print_function(object, seen_objects);
if (is<JS::Date>(object))
return print_date(object, seen_objects);
if (is<JS::Error>(object))
return print_error(object, seen_objects);
if (is<JS::RegExpObject>(object))
return print_regexp_object(object, seen_objects);
if (is<JS::Map>(object))
return print_map(object, seen_objects);
if (is<JS::Set>(object))
return print_set(object, seen_objects);
if (is<JS::DataView>(object))
return print_data_view(object, seen_objects);
if (is<JS::ProxyObject>(object))
return print_proxy_object(object, seen_objects);
if (is<JS::Promise>(object))
return print_promise(object, seen_objects);
if (is<JS::ArrayBuffer>(object))
return print_array_buffer(object, seen_objects);
if (object.is_typed_array())
return print_typed_array(object, seen_objects);
if (is<JS::StringObject>(object))
return print_primitive_wrapper_object("String", object, seen_objects);
if (is<JS::NumberObject>(object))
return print_primitive_wrapper_object("Number", object, seen_objects);
if (is<JS::BooleanObject>(object))
return print_primitive_wrapper_object("Boolean", object, seen_objects);
if (is<JS::Temporal::Calendar>(object))
return print_temporal_calendar(object, seen_objects);
if (is<JS::Temporal::Duration>(object))
return print_temporal_duration(object, seen_objects);
if (is<JS::Temporal::Instant>(object))
return print_temporal_instant(object, seen_objects);
if (is<JS::Temporal::PlainDate>(object))
return print_temporal_plain_date(object, seen_objects);
if (is<JS::Temporal::PlainDateTime>(object))
return print_temporal_plain_date_time(object, seen_objects);
if (is<JS::Temporal::PlainTime>(object))
return print_temporal_plain_time(object, seen_objects);
if (is<JS::Temporal::PlainYearMonth>(object))
return print_temporal_plain_year_month(object, seen_objects);
if (is<JS::Temporal::TimeZone>(object))
return print_temporal_time_zone(object, seen_objects);
if (is<JS::Temporal::ZonedDateTime>(object))
return print_temporal_zoned_date_time(object, seen_objects);
if (is<JS::Intl::DisplayNames>(object))
return print_intl_display_names(object, seen_objects);
if (is<JS::Intl::Locale>(object))
return print_intl_locale(object, seen_objects);
return print_object(object, seen_objects);
}
if (value.is_string())
out("\033[32;1m");
else if (value.is_number() || value.is_bigint())
out("\033[35;1m");
else if (value.is_boolean())
out("\033[33;1m");
else if (value.is_null())
out("\033[33;1m");
else if (value.is_undefined())
out("\033[34;1m");
if (value.is_string())
out("\"");
else if (value.is_negative_zero())
out("-");
out("{}", value.to_string_without_side_effects());
if (value.is_string())
out("\"");
out("\033[0m");
}
static void print(JS::Value value)
{
HashTable<JS::Object*> seen_objects;
print_value(value, seen_objects);
outln();
}
static bool write_to_file(String const& path)
{
int fd = open(path.characters(), O_WRONLY | O_CREAT | O_TRUNC, 0666);
for (size_t i = 0; i < repl_statements.size(); i++) {
auto line = repl_statements[i];
if (line.length() && i != repl_statements.size() - 1) {
ssize_t nwritten = write(fd, line.characters(), line.length());
if (nwritten < 0) {
close(fd);
return false;
}
}
if (i != repl_statements.size() - 1) {
char ch = '\n';
ssize_t nwritten = write(fd, &ch, 1);
if (nwritten != 1) {
perror("write");
close(fd);
return false;
}
}
}
close(fd);
return true;
}
static bool parse_and_run(JS::Interpreter& interpreter, StringView const& source)
{
auto program_type = s_as_module ? JS::Program::Type::Module : JS::Program::Type::Script;
auto parser = JS::Parser(JS::Lexer(source), program_type);
auto program = parser.parse_program();
if (s_dump_ast)
program->dump(0);
if (parser.has_errors()) {
auto error = parser.errors()[0];
auto hint = error.source_location_hint(source);
if (!hint.is_empty())
outln("{}", hint);
vm->throw_exception<JS::SyntaxError>(interpreter.global_object(), error.to_string());
} else {
if (s_dump_bytecode || s_run_bytecode) {
auto unit = JS::Bytecode::Generator::generate(*program);
if (s_opt_bytecode) {
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline();
passes.perform(unit);
dbgln("Optimisation passes took {}us", passes.elapsed());
}
if (s_dump_bytecode) {
for (auto& block : unit.basic_blocks)
block.dump(unit);
if (!unit.string_table->is_empty()) {
outln();
unit.string_table->dump();
}
}
if (s_run_bytecode) {
JS::Bytecode::Interpreter bytecode_interpreter(interpreter.global_object());
bytecode_interpreter.run(unit);
} else {
return true;
}
} else {
interpreter.run(interpreter.global_object(), *program);
}
}
auto handle_exception = [&] {
auto* exception = vm->exception();
vm->clear_exception();
out("Uncaught exception: ");
print(exception->value());
auto& traceback = exception->traceback();
if (traceback.size() > 1) {
unsigned repetitions = 0;
for (size_t i = 0; i < traceback.size(); ++i) {
auto& traceback_frame = traceback[i];
if (i + 1 < traceback.size()) {
auto& next_traceback_frame = traceback[i + 1];
if (next_traceback_frame.function_name == traceback_frame.function_name) {
repetitions++;
continue;
}
}
if (repetitions > 4) {
// If more than 5 (1 + >4) consecutive function calls with the same name, print
// the name only once and show the number of repetitions instead. This prevents
// printing ridiculously large call stacks of recursive functions.
outln(" -> {}", traceback_frame.function_name);
outln(" {} more calls", repetitions);
} else {
for (size_t j = 0; j < repetitions + 1; ++j)
outln(" -> {}", traceback_frame.function_name);
}
repetitions = 0;
}
}
};
if (vm->exception()) {
handle_exception();
return false;
}
if (s_print_last_result)
print(vm->last_value());
if (vm->exception()) {
handle_exception();
return false;
}
return true;
}
static JS::Value load_file_impl(JS::VM& vm, JS::GlobalObject& global_object)
{
auto filename = vm.argument(0).to_string(global_object);
if (vm.exception())
return {};
auto file = Core::File::construct(filename);
if (!file->open(Core::OpenMode::ReadOnly)) {
vm.throw_exception<JS::Error>(global_object, String::formatted("Failed to open '{}': {}", filename, file->error_string()));
return {};
}
auto file_contents = file->read_all();
auto source = StringView { file_contents };
auto parser = JS::Parser(JS::Lexer(source));
auto program = parser.parse_program();
if (parser.has_errors()) {
auto& error = parser.errors()[0];
vm.throw_exception<JS::SyntaxError>(global_object, error.to_string());
return {};
}
// FIXME: Use eval()-like semantics and execute in current scope?
vm.interpreter().run(global_object, *program);
return JS::js_undefined();
}
void ReplObject::initialize_global_object()
{
Base::initialize_global_object();
define_direct_property("global", this, JS::Attribute::Enumerable);
u8 attr = JS::Attribute::Configurable | JS::Attribute::Writable | JS::Attribute::Enumerable;
define_native_function("exit", exit_interpreter, 0, attr);
define_native_function("help", repl_help, 0, attr);
define_native_function("load", load_file, 1, attr);
define_native_function("save", save_to_file, 1, attr);
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::save_to_file)
{
if (!vm.argument_count())
return JS::Value(false);
String save_path = vm.argument(0).to_string_without_side_effects();
StringView path = StringView(save_path.characters());
if (write_to_file(path)) {
return JS::Value(true);
}
return JS::Value(false);
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::exit_interpreter)
{
if (!vm.argument_count())
exit(0);
auto exit_code = vm.argument(0).to_number(global_object);
if (::vm->exception())
return {};
exit(exit_code.as_double());
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::repl_help)
{
outln("REPL commands:");
outln(" exit(code): exit the REPL with specified code. Defaults to 0.");
outln(" help(): display this menu");
outln(" load(file): load given JS file into running session. For example: load(\"foo.js\")");
outln(" save(file): write REPL input history to the given file. For example: save(\"foo.txt\")");
return JS::js_undefined();
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::load_file)
{
return load_file_impl(vm, global_object);
}
void ScriptObject::initialize_global_object()
{
Base::initialize_global_object();
define_direct_property("global", this, JS::Attribute::Enumerable);
u8 attr = JS::Attribute::Configurable | JS::Attribute::Writable | JS::Attribute::Enumerable;
define_native_function("load", load_file, 1, attr);
}
JS_DEFINE_NATIVE_FUNCTION(ScriptObject::load_file)
{
return load_file_impl(vm, global_object);
}
static void repl(JS::Interpreter& interpreter)
{
while (!s_fail_repl) {
String piece = read_next_piece();
if (piece.is_empty())
continue;
repl_statements.append(piece);
parse_and_run(interpreter, piece);
}
}
static Function<void()> interrupt_interpreter;
static void sigint_handler()
{
interrupt_interpreter();
}
class ReplConsoleClient final : public JS::ConsoleClient {
public:
ReplConsoleClient(JS::Console& console)
: ConsoleClient(console)
{
}
virtual JS::Value log() override
{
outln("{}", vm().join_arguments());
return JS::js_undefined();
}
virtual JS::Value info() override
{
outln("(i) {}", vm().join_arguments());
return JS::js_undefined();
}
virtual JS::Value debug() override
{
outln("\033[36;1m{}\033[0m", vm().join_arguments());
return JS::js_undefined();
}
virtual JS::Value warn() override
{
outln("\033[33;1m{}\033[0m", vm().join_arguments());
return JS::js_undefined();
}
virtual JS::Value error() override
{
outln("\033[31;1m{}\033[0m", vm().join_arguments());
return JS::js_undefined();
}
virtual JS::Value clear() override
{
out("\033[3J\033[H\033[2J");
fflush(stdout);
return JS::js_undefined();
}
virtual JS::Value trace() override
{
outln("{}", vm().join_arguments());
auto trace = get_trace();
for (auto& function_name : trace) {
if (function_name.is_empty())
function_name = "<anonymous>";
outln(" -> {}", function_name);
}
return JS::js_undefined();
}
virtual JS::Value count() override
{
auto label = vm().argument_count() ? vm().argument(0).to_string_without_side_effects() : "default";
auto counter_value = m_console.counter_increment(label);
outln("{}: {}", label, counter_value);
return JS::js_undefined();
}
virtual JS::Value count_reset() override
{
auto label = vm().argument_count() ? vm().argument(0).to_string_without_side_effects() : "default";
if (m_console.counter_reset(label))
outln("{}: 0", label);
else
outln("\033[33;1m\"{}\" doesn't have a count\033[0m", label);
return JS::js_undefined();
}
virtual JS::Value assert_() override
{
auto& vm = this->vm();
if (!vm.argument(0).to_boolean()) {
if (vm.argument_count() > 1) {
out("\033[31;1mAssertion failed:\033[0m");
outln(" {}", vm.join_arguments(1));
} else {
outln("\033[31;1mAssertion failed\033[0m");
}
}
return JS::js_undefined();
}
};
int main(int argc, char** argv)
{
bool gc_on_every_allocation = false;
bool disable_syntax_highlight = false;
Vector<String> script_paths;
Core::ArgsParser args_parser;
args_parser.set_general_help("This is a JavaScript interpreter.");
args_parser.add_option(s_dump_ast, "Dump the AST", "dump-ast", 'A');
args_parser.add_option(s_dump_bytecode, "Dump the bytecode", "dump-bytecode", 'd');
args_parser.add_option(s_run_bytecode, "Run the bytecode", "run-bytecode", 'b');
args_parser.add_option(s_opt_bytecode, "Optimize the bytecode", "optimize-bytecode", 'p');
args_parser.add_option(s_as_module, "Treat as module", "as-module", 'm');
args_parser.add_option(s_print_last_result, "Print last result", "print-last-result", 'l');
args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
args_parser.add_option(disable_syntax_highlight, "Disable live syntax highlighting", "no-syntax-highlight", 's');
args_parser.add_positional_argument(script_paths, "Path to script files", "scripts", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
bool syntax_highlight = !disable_syntax_highlight;
vm = JS::VM::create();
// NOTE: These will print out both warnings when using something like Promise.reject().catch(...) -
// which is, as far as I can tell, correct - a promise is created, rejected without handler, and a
// handler then attached to it. The Node.js REPL doesn't warn in this case, so it's something we