runtime/FunctionConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include "config.h"
  22 #include "FunctionConstructor.h"
  23
  24 #include "Debugger.h"
  25 #include "ExceptionHelpers.h"
  26 #include "FunctionPrototype.h"
  27 #include "JSFunction.h"
  28 #include "JSGlobalObject.h"
  29 #include "JSString.h"
  30 #include "Lexer.h"
  31 #include "Nodes.h"
  32 #include "Parser.h"
  33 #include "UStringBuilder.h"
  34 #include "UStringConcatenate.h"
  35
  36 namespace JSC {
  37
  38 ASSERT_CLASS_FITS_IN_CELL(FunctionConstructor);
  39
  40 FunctionConstructor::FunctionConstructor(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, FunctionPrototype* functionPrototype)
  41     : InternalFunction(&exec->globalData(), globalObject, structure, Identifier(exec, functionPrototype->classInfo()->className))
  42 {
  43     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, functionPrototype, DontEnum | DontDelete | ReadOnly);
  44
  45     // Number of arguments for constructor
  46     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontDelete | DontEnum);
  47 }
  48
  49 static EncodedJSValue JSC_HOST_CALL constructWithFunctionConstructor(ExecState* exec)
  50 {
  51     ArgList args(exec);
  52     return JSValue::encode(constructFunction(exec, asInternalFunction(exec->callee())->globalObject(), args));
  53 }
  54
  55 ConstructType FunctionConstructor::getConstructData(ConstructData& constructData)
  56 {
  57     constructData.native.function = constructWithFunctionConstructor;
  58     return ConstructTypeHost;
  59 }
  60
  61 static EncodedJSValue JSC_HOST_CALL callFunctionConstructor(ExecState* exec)
  62 {
  63     ArgList args(exec);
  64     return JSValue::encode(constructFunction(exec, asInternalFunction(exec->callee())->globalObject(), args));
  65 }
  66
  67 // ECMA 15.3.1 The Function Constructor Called as a Function
  68 CallType FunctionConstructor::getCallData(CallData& callData)
  69 {
  70     callData.native.function = callFunctionConstructor;
  71     return CallTypeHost;
  72 }
  73
  74 // ECMA 15.3.2 The Function Constructor
  75 JSObject* constructFunction(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
  76 {
  77     if (!globalObject->isEvalEnabled())
  78         return throwError(exec, createEvalError(exec, "Function constructor is disabled"));
  79     return constructFunctionSkippingEvalEnabledCheck(exec, globalObject, args, functionName, sourceURL, lineNumber);
  80 }
  81
  82 JSObject* constructFunctionSkippingEvalEnabledCheck(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
  83 {
  84     // Functions need to have a space following the opening { due to for web compatibility
  85     // see https://bugs.webkit.org/show_bug.cgi?id=24350
  86     // We also need \n before the closing } to handle // comments at the end of the last line
  87     UString program;
  88     if (args.isEmpty())
  89         program = "(function() { \n})";
  90     else if (args.size() == 1)
  91         program = makeUString("(function() { ", args.at(0).toString(exec), "\n})");
  92     else {
  93         UStringBuilder builder;
  94         builder.append("(function(");
  95         builder.append(args.at(0).toString(exec));
  96         for (size_t i = 1; i < args.size() - 1; i++) {
  97             builder.append(",");
  98             builder.append(args.at(i).toString(exec));
  99         }
 100         builder.append(") { ");
 101         builder.append(args.at(args.size() - 1).toString(exec));
 102         builder.append("\n})");
 103         program = builder.toUString();
 104     }
 105
 106     JSGlobalData& globalData = globalObject->globalData();
 107     SourceCode source = makeSource(program, sourceURL, lineNumber);
 108     JSObject* exception = 0;
 109     FunctionExecutable* function = FunctionExecutable::fromGlobalCode(functionName, exec, exec->dynamicGlobalObject()->debugger(), source, &exception);
 110     if (!function) {
 111         ASSERT(exception);
 112         return throwError(exec, exception);
 113     }
 114
 115     ScopeChainNode* scopeChain = new (exec) ScopeChainNode(0, globalObject, &globalData, globalObject, exec->globalThisValue());
 116     return new (exec) JSFunction(exec, function, scopeChain);
 117 }
 118
 119 // ECMA 15.3.2 The Function Constructor
 120 JSObject* constructFunction(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args)
 121 {
 122     return constructFunction(exec, globalObject, args, Identifier(exec, "anonymous"), UString(), 1);
 123 }
 124
 125 } // namespace JSC