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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2003-2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "config.h"
#include "FunctionConstructor.h"
#include "ExceptionHelpers.h"
#include "FunctionPrototype.h"
#include "GlobalObjectMethodTable.h"
#include "JSAsyncFunction.h"
#include "JSAsyncGeneratorFunction.h"
#include "JSFunction.h"
#include "JSGeneratorFunction.h"
#include "JSGlobalObject.h"
#include "JSCInlines.h"
#include <wtf/text/StringBuilder.h>
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(FunctionConstructor);
const ClassInfo FunctionConstructor::s_info = { "Function"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(FunctionConstructor) };
static JSC_DECLARE_HOST_FUNCTION(constructWithFunctionConstructor);
static JSC_DECLARE_HOST_FUNCTION(callFunctionConstructor);
JSC_DEFINE_HOST_FUNCTION(constructWithFunctionConstructor, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
ArgList args(callFrame);
return JSValue::encode(constructFunction(globalObject, callFrame, args, FunctionConstructionMode::Function, callFrame->newTarget()));
}
// ECMA 15.3.1 The Function Constructor Called as a Function
JSC_DEFINE_HOST_FUNCTION(callFunctionConstructor, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
ArgList args(callFrame);
return JSValue::encode(constructFunction(globalObject, callFrame, args));
}
FunctionConstructor::FunctionConstructor(VM& vm, Structure* structure)
: InternalFunction(vm, structure, callFunctionConstructor, constructWithFunctionConstructor)
{
}
void FunctionConstructor::finishCreation(VM& vm, FunctionPrototype* functionPrototype)
{
Base::finishCreation(vm, 1, vm.propertyNames->Function.string(), PropertyAdditionMode::WithoutStructureTransition);
putDirectWithoutTransition(vm, vm.propertyNames->prototype, functionPrototype, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
}
static String stringifyFunction(JSGlobalObject* globalObject, const ArgList& args, const Identifier& functionName, FunctionConstructionMode functionConstructionMode, ThrowScope& scope, std::optional<int>& functionConstructorParametersEndPosition)
{
const char* prefix = nullptr;
switch (functionConstructionMode) {
case FunctionConstructionMode::Function:
prefix = "function ";
break;
case FunctionConstructionMode::Generator:
prefix = "function* ";
break;
case FunctionConstructionMode::Async:
prefix = "async function ";
break;
case FunctionConstructionMode::AsyncGenerator:
prefix = "async function* ";
break;
}
// How we stringify functions is sometimes important for web compatibility.
// See https://bugs.webkit.org/show_bug.cgi?id=24350.
String program;
functionConstructorParametersEndPosition = std::nullopt;
if (args.isEmpty())
program = makeString(prefix, functionName.string(), "(\n) {\n\n}"_s);
else if (args.size() == 1) {
auto body = args.at(0).toWTFString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
program = tryMakeString(prefix, functionName.string(), "(\n) {\n"_s, body, "\n}"_s);
if (UNLIKELY(!program)) {
throwOutOfMemoryError(globalObject, scope);
return { };
}
} else {
StringBuilder builder(StringBuilder::OverflowHandler::RecordOverflow);
builder.append(prefix, functionName.string(), '(');
auto* jsString = args.at(0).toString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
auto viewWithString = jsString->viewWithUnderlyingString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
builder.append(viewWithString.view);
for (size_t i = 1; !builder.hasOverflowed() && i < args.size() - 1; i++) {
auto* jsString = args.at(i).toString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
auto viewWithString = jsString->viewWithUnderlyingString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
builder.append(",", viewWithString.view);
}
if (UNLIKELY(builder.hasOverflowed())) {
throwOutOfMemoryError(globalObject, scope);
return { };
}
functionConstructorParametersEndPosition = builder.length() + sizeof("\n)") - 1;
auto* bodyString = args.at(args.size() - 1).toString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
auto body = bodyString->viewWithUnderlyingString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
builder.append("\n) {\n", body.view, "\n}");
if (UNLIKELY(builder.hasOverflowed())) {
throwOutOfMemoryError(globalObject, scope);
return { };
}
program = builder.toString();
}
return program;
}
// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(JSGlobalObject* globalObject, const ArgList& args, const Identifier& functionName, const SourceOrigin& sourceOrigin, const String& sourceURL, SourceTaintedOrigin taintedOrigin, const TextPosition& position, FunctionConstructionMode functionConstructionMode, JSValue newTarget)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
std::optional<int> functionConstructorParametersEndPosition;
auto code = stringifyFunction(globalObject, args, functionName, functionConstructionMode, scope, functionConstructorParametersEndPosition);
EXCEPTION_ASSERT(!!scope.exception() == code.isNull());
if (UNLIKELY(!globalObject->evalEnabled())) {
scope.clearException();
globalObject->globalObjectMethodTable()->reportViolationForUnsafeEval(globalObject, !code.isNull() ? jsNontrivialString(vm, WTFMove(code)) : nullptr);
throwException(globalObject, scope, createEvalError(globalObject, globalObject->evalDisabledErrorMessage()));
return nullptr;
}
if (UNLIKELY(code.isNull()))
return nullptr;
RELEASE_AND_RETURN(scope, constructFunctionSkippingEvalEnabledCheck(globalObject, WTFMove(code), functionName, sourceOrigin, sourceURL, taintedOrigin, position, -1, functionConstructorParametersEndPosition, functionConstructionMode, newTarget));
}
JSObject* constructFunctionSkippingEvalEnabledCheck(JSGlobalObject* globalObject, String&& program, const Identifier& functionName, const SourceOrigin& sourceOrigin, const String& sourceURL, SourceTaintedOrigin taintedOrigin, const TextPosition& position, int overrideLineNumber, std::optional<int> functionConstructorParametersEndPosition, FunctionConstructionMode functionConstructionMode, JSValue newTarget)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
SourceCode source = makeSource(program, sourceOrigin, taintedOrigin, sourceURL, position);
JSObject* exception = nullptr;
FunctionExecutable* function = FunctionExecutable::fromGlobalCode(functionName, globalObject, source, exception, overrideLineNumber, functionConstructorParametersEndPosition);
if (UNLIKELY(!function)) {
ASSERT(exception);
throwException(globalObject, scope, exception);
return nullptr;
}
JSGlobalObject* structureGlobalObject = globalObject;
bool needsSubclassStructure = newTarget && newTarget != globalObject->functionConstructor();
if (needsSubclassStructure) {
structureGlobalObject = getFunctionRealm(globalObject, asObject(newTarget));
RETURN_IF_EXCEPTION(scope, nullptr);
}
Structure* structure = nullptr;
switch (functionConstructionMode) {
case FunctionConstructionMode::Function:
structure = JSFunction::selectStructureForNewFuncExp(structureGlobalObject, function);
break;
case FunctionConstructionMode::Generator:
structure = structureGlobalObject->generatorFunctionStructure();
break;
case FunctionConstructionMode::Async:
structure = structureGlobalObject->asyncFunctionStructure();
break;
case FunctionConstructionMode::AsyncGenerator:
structure = structureGlobalObject->asyncGeneratorFunctionStructure();
break;
}
if (needsSubclassStructure) {
structure = InternalFunction::createSubclassStructure(globalObject, asObject(newTarget), structure);
RETURN_IF_EXCEPTION(scope, nullptr);
}
switch (functionConstructionMode) {
case FunctionConstructionMode::Function:
return JSFunction::create(vm, function, globalObject->globalScope(), structure);
case FunctionConstructionMode::Generator:
return JSGeneratorFunction::create(vm, function, globalObject->globalScope(), structure);
case FunctionConstructionMode::Async:
return JSAsyncFunction::create(vm, function, globalObject->globalScope(), structure);
case FunctionConstructionMode::AsyncGenerator:
return JSAsyncGeneratorFunction::create(vm, function, globalObject->globalScope(), structure);
}
ASSERT_NOT_REACHED();
return nullptr;
}
// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(JSGlobalObject* globalObject, CallFrame* callFrame, const ArgList& args, FunctionConstructionMode functionConstructionMode, JSValue newTarget)
{
VM& vm = globalObject->vm();
return constructFunction(globalObject, args, vm.propertyNames->anonymous, callFrame->callerSourceOrigin(vm), String(), computeNewSourceTaintedOriginFromStack(vm, callFrame), TextPosition(), functionConstructionMode, newTarget);
}
} // namespace JSC
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