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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/AST.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/ExecutionContext.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/SourceRange.h>
namespace JS {
Error* Error::create(Realm& realm)
{
return realm.heap().allocate<Error>(realm, *realm.intrinsics().error_prototype());
}
Error* Error::create(Realm& realm, String const& message)
{
auto& vm = realm.vm();
auto* error = Error::create(realm);
u8 attr = Attribute::Writable | Attribute::Configurable;
error->define_direct_property(vm.names.message, js_string(vm, message), attr);
return error;
}
Error::Error(Object& prototype)
: Object(prototype)
{
populate_stack();
}
// 20.5.8.1 InstallErrorCause ( O, options ), https://tc39.es/ecma262/#sec-installerrorcause
ThrowCompletionOr<void> Error::install_error_cause(Value options)
{
auto& vm = this->vm();
// 1. If Type(options) is Object and ? HasProperty(options, "cause") is true, then
if (options.is_object() && TRY(options.as_object().has_property(vm.names.cause))) {
// a. Let cause be ? Get(options, "cause").
auto cause = TRY(options.as_object().get(vm.names.cause));
// b. Perform CreateNonEnumerableDataPropertyOrThrow(O, "cause", cause).
create_non_enumerable_data_property_or_throw(vm.names.cause, cause);
}
// 2. Return unused.
return {};
}
void Error::populate_stack()
{
auto& vm = this->vm();
m_traceback.ensure_capacity(vm.execution_context_stack().size());
for (ssize_t i = vm.execution_context_stack().size() - 1; i >= 0; i--) {
auto* context = vm.execution_context_stack()[i];
auto function_name = context->function_name;
if (function_name.is_empty())
function_name = "<unknown>"sv;
m_traceback.empend(
move(function_name),
// We might not have an AST node associated with the execution context, e.g. in promise
// reaction jobs (which aren't called anywhere from the source code).
// They're not going to generate any _unhandled_ exceptions though, so a meaningless
// source range is fine.
context->current_node ? context->current_node->source_range() : SourceRange {});
}
}
String Error::stack_string() const
{
StringBuilder stack_string_builder;
// Note: We roughly follow V8's formatting
// Note: The error's name and message get prepended by ErrorPrototype::stack
// Note: We don't want to capture the global execution context, so we omit the last frame
// FIXME: We generate a stack-frame for the Errors constructor, other engines do not
for (size_t i = 0; i < m_traceback.size() - 1; ++i) {
auto const& frame = m_traceback[i];
auto function_name = frame.function_name;
// Note: Since we don't know whether we have a valid SourceRange here we just check for some default values.
if (!frame.source_range.filename.is_null() || frame.source_range.start.offset != 0 || frame.source_range.end.offset != 0) {
if (function_name == "<unknown>"sv)
stack_string_builder.appendff(" at {}:{}:{}\n", frame.source_range.filename, frame.source_range.start.line, frame.source_range.start.column);
else
stack_string_builder.appendff(" at {} ({}:{}:{})\n", function_name, frame.source_range.filename, frame.source_range.start.line, frame.source_range.start.column);
} else {
stack_string_builder.appendff(" at {}\n", function_name.is_empty() ? "<unknown>"sv : function_name.view());
}
}
return stack_string_builder.build();
}
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
ClassName* ClassName::create(Realm& realm) \
{ \
return realm.heap().allocate<ClassName>(realm, *realm.intrinsics().snake_name##_prototype()); \
} \
\
ClassName* ClassName::create(Realm& realm, String const& message) \
{ \
auto& vm = realm.vm(); \
auto* error = ClassName::create(realm); \
u8 attr = Attribute::Writable | Attribute::Configurable; \
error->define_direct_property(vm.names.message, js_string(vm, message), attr); \
return error; \
} \
\
ClassName::ClassName(Object& prototype) \
: Error(prototype) \
{ \
}
JS_ENUMERATE_NATIVE_ERRORS
#undef __JS_ENUMERATE
}
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