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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2003-2008, 2013, 2016 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 "JSAsyncFunction.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", &Base::s_info, 0, CREATE_METHOD_TABLE(FunctionConstructor) };
FunctionConstructor::FunctionConstructor(VM& vm, Structure* structure)
: InternalFunction(vm, structure)
{
}
void FunctionConstructor::finishCreation(VM& vm, FunctionPrototype* functionPrototype)
{
Base::finishCreation(vm, functionPrototype->classInfo()->className);
putDirectWithoutTransition(vm, vm.propertyNames->prototype, functionPrototype, DontEnum | DontDelete | ReadOnly);
// Number of arguments for constructor
putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), ReadOnly | DontDelete | DontEnum);
}
static EncodedJSValue JSC_HOST_CALL constructWithFunctionConstructor(ExecState* exec)
{
ArgList args(exec);
return JSValue::encode(constructFunction(exec, asInternalFunction(exec->jsCallee())->globalObject(), args, FunctionConstructionMode::Function, exec->newTarget()));
}
ConstructType FunctionConstructor::getConstructData(JSCell*, ConstructData& constructData)
{
constructData.native.function = constructWithFunctionConstructor;
return ConstructType::Host;
}
static EncodedJSValue JSC_HOST_CALL callFunctionConstructor(ExecState* exec)
{
ArgList args(exec);
return JSValue::encode(constructFunction(exec, asInternalFunction(exec->jsCallee())->globalObject(), args));
}
// ECMA 15.3.1 The Function Constructor Called as a Function
CallType FunctionConstructor::getCallData(JSCell*, CallData& callData)
{
callData.native.function = callFunctionConstructor;
return CallType::Host;
}
// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args, const Identifier& functionName, const SourceOrigin& sourceOrigin, const String& sourceURL, const TextPosition& position, FunctionConstructionMode functionConstructionMode, JSValue newTarget)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (!globalObject->evalEnabled())
return throwException(exec, scope, createEvalError(exec, globalObject->evalDisabledErrorMessage()));
scope.release();
return constructFunctionSkippingEvalEnabledCheck(exec, globalObject, args, functionName, sourceOrigin, sourceURL, position, -1, functionConstructionMode, newTarget);
}
JSObject* constructFunctionSkippingEvalEnabledCheck(
ExecState* exec, JSGlobalObject* globalObject, const ArgList& args,
const Identifier& functionName, const SourceOrigin& sourceOrigin, const String& sourceURL,
const TextPosition& position, int overrideLineNumber, FunctionConstructionMode functionConstructionMode, JSValue newTarget)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
const char* prefix = nullptr;
Structure* structure = nullptr;
switch (functionConstructionMode) {
case FunctionConstructionMode::Function:
structure = globalObject->functionStructure();
prefix = "{function ";
break;
case FunctionConstructionMode::Generator:
structure = globalObject->generatorFunctionStructure();
prefix = "{function *";
break;
case FunctionConstructionMode::Async:
structure = globalObject->asyncFunctionStructure();
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;
if (args.isEmpty())
program = makeString(prefix, functionName.string(), "() {\n\n}}");
else if (args.size() == 1) {
auto body = args.at(0).toWTFString(exec);
RETURN_IF_EXCEPTION(scope, nullptr);
program = makeString(prefix, functionName.string(), "() {\n", body, "\n}}");
} else {
StringBuilder builder;
builder.append(prefix);
builder.append(functionName.string());
builder.append('(');
auto viewWithString = args.at(0).toString(exec)->viewWithUnderlyingString(*exec);
RETURN_IF_EXCEPTION(scope, nullptr);
builder.append(viewWithString.view);
for (size_t i = 1; i < args.size() - 1; i++) {
builder.appendLiteral(", ");
auto viewWithString = args.at(i).toString(exec)->viewWithUnderlyingString(*exec);
RETURN_IF_EXCEPTION(scope, nullptr);
builder.append(viewWithString.view);
}
builder.appendLiteral(") {\n");
viewWithString = args.at(args.size() - 1).toString(exec)->viewWithUnderlyingString(*exec);
RETURN_IF_EXCEPTION(scope, nullptr);
builder.append(viewWithString.view);
builder.appendLiteral("\n}}");
program = builder.toString();
}
SourceCode source = makeSource(program, sourceOrigin, sourceURL, position);
JSObject* exception = nullptr;
FunctionExecutable* function = FunctionExecutable::fromGlobalCode(functionName, *exec, source, exception, overrideLineNumber);
if (!function) {
ASSERT(exception);
return throwException(exec, scope, exception);
}
Structure* subclassStructure = InternalFunction::createSubclassStructure(exec, newTarget, structure);
RETURN_IF_EXCEPTION(scope, nullptr);
switch (functionConstructionMode) {
case FunctionConstructionMode::Function:
return JSFunction::create(vm, function, globalObject->globalScope(), subclassStructure);
case FunctionConstructionMode::Generator:
return JSGeneratorFunction::create(vm, function, globalObject->globalScope(), subclassStructure);
case FunctionConstructionMode::Async:
return JSAsyncFunction::create(vm, function, globalObject->globalScope(), subclassStructure);
}
ASSERT_NOT_REACHED();
return nullptr;
}
// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args, FunctionConstructionMode functionConstructionMode, JSValue newTarget)
{
return constructFunction(exec, globalObject, args, exec->propertyNames().anonymous, exec->callerSourceOrigin(), String(), TextPosition(), functionConstructionMode, newTarget);
}
} // namespace JSC
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