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https://github.com/RGBCube/serenity
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88814acbd3
This includes an Error::create overload to create an Error from a UTF-8 StringView. If creating a String from that view fails, the factory will return an OOM InternalError instead. VM::throw_completion can also make use of this overload via its perfect forwarding.
136 lines
8.1 KiB
C++
136 lines
8.1 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/AST.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/ExecutionContext.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/ThrowableStringBuilder.h>
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#include <LibJS/SourceRange.h>
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namespace JS {
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NonnullGCPtr<Error> Error::create(Realm& realm)
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{
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return realm.heap().allocate<Error>(realm, *realm.intrinsics().error_prototype()).release_allocated_value_but_fixme_should_propagate_errors();
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}
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NonnullGCPtr<Error> Error::create(Realm& realm, String message)
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{
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auto& vm = realm.vm();
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auto error = Error::create(realm);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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error->define_direct_property(vm.names.message, PrimitiveString::create(vm, move(message)), attr);
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return error;
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}
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ThrowCompletionOr<NonnullGCPtr<Error>> Error::create(Realm& realm, StringView message)
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{
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return create(realm, TRY_OR_THROW_OOM(realm.vm(), String::from_utf8(message)));
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}
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Error::Error(Object& prototype)
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: Object(ConstructWithPrototypeTag::Tag, prototype)
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{
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populate_stack();
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}
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// 20.5.8.1 InstallErrorCause ( O, options ), https://tc39.es/ecma262/#sec-installerrorcause
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ThrowCompletionOr<void> Error::install_error_cause(Value options)
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{
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auto& vm = this->vm();
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// 1. If Type(options) is Object and ? HasProperty(options, "cause") is true, then
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if (options.is_object() && TRY(options.as_object().has_property(vm.names.cause))) {
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// a. Let cause be ? Get(options, "cause").
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auto cause = TRY(options.as_object().get(vm.names.cause));
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// b. Perform CreateNonEnumerableDataPropertyOrThrow(O, "cause", cause).
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create_non_enumerable_data_property_or_throw(vm.names.cause, cause);
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}
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// 2. Return unused.
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return {};
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}
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void Error::populate_stack()
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{
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static auto dummy_source_range = SourceRange { .code = SourceCode::create(String {}, String {}), .start = {}, .end = {} };
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auto& vm = this->vm();
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m_traceback.ensure_capacity(vm.execution_context_stack().size());
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for (ssize_t i = vm.execution_context_stack().size() - 1; i >= 0; i--) {
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auto* context = vm.execution_context_stack()[i];
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auto function_name = context->function_name;
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if (function_name.is_empty())
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function_name = "<unknown>"sv;
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m_traceback.empend(
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move(function_name),
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// We might not have an AST node associated with the execution context, e.g. in promise
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// reaction jobs (which aren't called anywhere from the source code).
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// They're not going to generate any _unhandled_ exceptions though, so a meaningless
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// source range is fine.
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context->current_node ? context->current_node->source_range() : dummy_source_range);
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}
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}
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ThrowCompletionOr<String> Error::stack_string(VM& vm) const
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{
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ThrowableStringBuilder stack_string_builder(vm);
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// Note: We roughly follow V8's formatting
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// Note: The error's name and message get prepended by ErrorPrototype::stack
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// Note: We don't want to capture the global execution context, so we omit the last frame
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// FIXME: We generate a stack-frame for the Errors constructor, other engines do not
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for (size_t i = 0; i < m_traceback.size() - 1; ++i) {
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auto const& frame = m_traceback[i];
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auto function_name = frame.function_name;
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// Note: Since we don't know whether we have a valid SourceRange here we just check for some default values.
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if (!frame.source_range.filename().is_empty() || frame.source_range.start.offset != 0 || frame.source_range.end.offset != 0) {
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if (function_name == "<unknown>"sv)
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MUST_OR_THROW_OOM(stack_string_builder.appendff(" at {}:{}:{}\n", frame.source_range.filename(), frame.source_range.start.line, frame.source_range.start.column));
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else
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MUST_OR_THROW_OOM(stack_string_builder.appendff(" at {} ({}:{}:{})\n", function_name, frame.source_range.filename(), frame.source_range.start.line, frame.source_range.start.column));
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} else {
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MUST_OR_THROW_OOM(stack_string_builder.appendff(" at {}\n", function_name.is_empty() ? "<unknown>"sv : function_name.view()));
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}
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}
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return stack_string_builder.to_string();
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}
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#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
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NonnullGCPtr<ClassName> ClassName::create(Realm& realm) \
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{ \
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return realm.heap().allocate<ClassName>(realm, *realm.intrinsics().snake_name##_prototype()).release_allocated_value_but_fixme_should_propagate_errors(); \
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} \
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\
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NonnullGCPtr<ClassName> ClassName::create(Realm& realm, String message) \
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{ \
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auto& vm = realm.vm(); \
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auto error = ClassName::create(realm); \
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u8 attr = Attribute::Writable | Attribute::Configurable; \
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error->define_direct_property(vm.names.message, PrimitiveString::create(vm, move(message)), attr); \
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return error; \
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} \
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\
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ThrowCompletionOr<NonnullGCPtr<ClassName>> ClassName::create(Realm& realm, StringView message) \
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{ \
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return create(realm, TRY_OR_THROW_OOM(realm.vm(), String::from_utf8(message))); \
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} \
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\
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ClassName::ClassName(Object& prototype) \
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: Error(prototype) \
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{ \
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}
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JS_ENUMERATE_NATIVE_ERRORS
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#undef __JS_ENUMERATE
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}
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