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Issue 1542963002: [runtime] Introduce dedicated JSBoundFunction to represent bound functions. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@FunctionConstructor
Patch Set: [arm64] Poke does not preserve flags with --debug-code. Created 4 years, 11 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "src/builtins.h" 5 #include "src/builtins.h"
6 6
7 #include "src/api.h" 7 #include "src/api.h"
8 #include "src/api-natives.h" 8 #include "src/api-natives.h"
9 #include "src/arguments.h" 9 #include "src/arguments.h"
10 #include "src/base/once.h" 10 #include "src/base/once.h"
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1964 // ES6 section 19.2.1.1 Function ( p1, p2, ... , pn, body ) 1964 // ES6 section 19.2.1.1 Function ( p1, p2, ... , pn, body )
1965 BUILTIN(FunctionConstructor) { 1965 BUILTIN(FunctionConstructor) {
1966 HandleScope scope(isolate); 1966 HandleScope scope(isolate);
1967 Handle<JSFunction> result; 1967 Handle<JSFunction> result;
1968 ASSIGN_RETURN_FAILURE_ON_EXCEPTION( 1968 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
1969 isolate, result, CreateDynamicFunction(isolate, args, "function")); 1969 isolate, result, CreateDynamicFunction(isolate, args, "function"));
1970 return *result; 1970 return *result;
1971 } 1971 }
1972 1972
1973 1973
1974 // ES6 section 19.2.3.2 Function.prototype.bind ( thisArg, ...args )
1975 BUILTIN(FunctionPrototypeBind) {
1976 HandleScope scope(isolate);
1977 DCHECK_LE(1, args.length());
1978 if (!args.receiver()->IsCallable()) {
1979 THROW_NEW_ERROR_RETURN_FAILURE(
1980 isolate, NewTypeError(MessageTemplate::kFunctionBind));
1981 }
1982
1983 // Allocate the bound function with the given {this_arg} and {args}.
1984 Handle<JSReceiver> target = args.at<JSReceiver>(0);
1985 Handle<Object> this_arg = isolate->factory()->undefined_value();
1986 ScopedVector<Handle<Object>> argv(std::max(0, args.length() - 2));
1987 if (args.length() > 1) {
1988 this_arg = args.at<Object>(1);
1989 for (int i = 2; i < args.length(); ++i) {
1990 argv[i - 2] = args.at<Object>(i);
1991 }
1992 }
1993 Handle<JSBoundFunction> function;
1994 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
1995 isolate, function,
1996 isolate->factory()->NewJSBoundFunction(target, this_arg, argv));
1997
1998 // TODO(bmeurer): Optimize the rest for the common cases where {target} is
1999 // a function with some initial map or even a bound function.
2000 // Setup the "length" property based on the "length" of the {target}.
2001 Handle<Object> length(Smi::FromInt(0), isolate);
2002 Maybe<bool> target_has_length =
2003 JSReceiver::HasOwnProperty(target, isolate->factory()->length_string());
2004 if (!target_has_length.IsJust()) {
2005 return isolate->heap()->exception();
2006 } else if (target_has_length.FromJust()) {
2007 Handle<Object> target_length;
2008 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
2009 isolate, target_length,
2010 JSReceiver::GetProperty(target, isolate->factory()->length_string()));
2011 if (target_length->IsNumber()) {
2012 length = isolate->factory()->NewNumber(std::max(
2013 0.0, DoubleToInteger(target_length->Number()) - argv.length()));
2014 }
2015 }
2016 function->set_length(*length);
2017
2018 // Setup the "name" property based on the "name" of the {target}.
2019 Handle<Object> target_name;
2020 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
2021 isolate, target_name,
2022 JSReceiver::GetProperty(target, isolate->factory()->name_string()));
2023 Handle<String> name;
2024 if (!target_name->IsString()) {
2025 name = isolate->factory()->bound__string();
2026 } else {
2027 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
2028 isolate, name, Name::ToFunctionName(Handle<String>::cast(target_name)));
2029 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
2030 isolate, name, isolate->factory()->NewConsString(
2031 isolate->factory()->bound__string(), name));
2032 }
2033 function->set_name(*name);
2034 return *function;
2035 }
2036
2037
1974 // ES6 section 19.2.3.5 Function.prototype.toString ( ) 2038 // ES6 section 19.2.3.5 Function.prototype.toString ( )
1975 BUILTIN(FunctionPrototypeToString) { 2039 BUILTIN(FunctionPrototypeToString) {
1976 HandleScope scope(isolate); 2040 HandleScope scope(isolate);
1977 Handle<Object> receiver = args.receiver(); 2041 Handle<Object> receiver = args.receiver();
1978 2042
1979 if (receiver->IsJSFunction()) { 2043 if (receiver->IsJSBoundFunction()) {
2044 return *JSBoundFunction::ToString(Handle<JSBoundFunction>::cast(receiver));
2045 } else if (receiver->IsJSFunction()) {
1980 return *JSFunction::ToString(Handle<JSFunction>::cast(receiver)); 2046 return *JSFunction::ToString(Handle<JSFunction>::cast(receiver));
1981 } 2047 }
1982 THROW_NEW_ERROR_RETURN_FAILURE( 2048 THROW_NEW_ERROR_RETURN_FAILURE(
1983 isolate, NewTypeError(MessageTemplate::kNotGeneric, 2049 isolate, NewTypeError(MessageTemplate::kNotGeneric,
1984 isolate->factory()->NewStringFromAsciiChecked( 2050 isolate->factory()->NewStringFromAsciiChecked(
1985 "Function.prototype.toString"))); 2051 "Function.prototype.toString")));
1986 } 2052 }
1987 2053
1988 2054
1989 // ES6 section 25.2.1.1 GeneratorFunction (p1, p2, ... , pn, body) 2055 // ES6 section 25.2.1.1 GeneratorFunction (p1, p2, ... , pn, body)
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2700 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C) 2766 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
2701 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A) 2767 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
2702 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H) 2768 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
2703 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A) 2769 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
2704 #undef DEFINE_BUILTIN_ACCESSOR_C 2770 #undef DEFINE_BUILTIN_ACCESSOR_C
2705 #undef DEFINE_BUILTIN_ACCESSOR_A 2771 #undef DEFINE_BUILTIN_ACCESSOR_A
2706 2772
2707 2773
2708 } // namespace internal 2774 } // namespace internal
2709 } // namespace v8 2775 } // namespace v8
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