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 "FunctionPrototype.h"
25 #include "JSFunction.h"
26 #include "JSGlobalObject.h"
27 #include "JSString.h"
28 #include "Parser.h"
29 #include "Debugger.h"
30 #include "Lexer.h"
31 #include "Nodes.h"
32
33 namespace JSC {
34
35 ASSERT_CLASS_FITS_IN_CELL(FunctionConstructor);
36
FunctionConstructor(ExecState * exec,PassRefPtr<Structure> structure,FunctionPrototype * functionPrototype)37 FunctionConstructor::FunctionConstructor(ExecState* exec, PassRefPtr<Structure> structure, FunctionPrototype* functionPrototype)
38 : InternalFunction(&exec->globalData(), structure, Identifier(exec, functionPrototype->classInfo()->className))
39 {
40 putDirectWithoutTransition(exec->propertyNames().prototype, functionPrototype, DontEnum | DontDelete | ReadOnly);
41
42 // Number of arguments for constructor
43 putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontDelete | DontEnum);
44 }
45
constructWithFunctionConstructor(ExecState * exec,JSObject *,const ArgList & args)46 static JSObject* constructWithFunctionConstructor(ExecState* exec, JSObject*, const ArgList& args)
47 {
48 return constructFunction(exec, args);
49 }
50
getConstructData(ConstructData & constructData)51 ConstructType FunctionConstructor::getConstructData(ConstructData& constructData)
52 {
53 constructData.native.function = constructWithFunctionConstructor;
54 return ConstructTypeHost;
55 }
56
callFunctionConstructor(ExecState * exec,JSObject *,JSValue,const ArgList & args)57 static JSValue JSC_HOST_CALL callFunctionConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
58 {
59 return constructFunction(exec, args);
60 }
61
62 // ECMA 15.3.1 The Function Constructor Called as a Function
getCallData(CallData & callData)63 CallType FunctionConstructor::getCallData(CallData& callData)
64 {
65 callData.native.function = callFunctionConstructor;
66 return CallTypeHost;
67 }
68
extractFunctionBody(ProgramNode * program)69 FunctionBodyNode* extractFunctionBody(ProgramNode* program)
70 {
71 if (!program)
72 return 0;
73
74 StatementVector& children = program->children();
75 if (children.size() != 1)
76 return 0;
77
78 StatementNode* exprStatement = children[0];
79 ASSERT(exprStatement);
80 ASSERT(exprStatement->isExprStatement());
81 if (!exprStatement || !exprStatement->isExprStatement())
82 return 0;
83
84 ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
85 ASSERT(funcExpr);
86 ASSERT(funcExpr->isFuncExprNode());
87 if (!funcExpr || !funcExpr->isFuncExprNode())
88 return 0;
89
90 FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
91 ASSERT(body);
92 return body;
93 }
94
95 // ECMA 15.3.2 The Function Constructor
constructFunction(ExecState * exec,const ArgList & args,const Identifier & functionName,const UString & sourceURL,int lineNumber)96 JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
97 {
98 // Functions need to have a space following the opening { due to for web compatibility
99 // see https://bugs.webkit.org/show_bug.cgi?id=24350
100 // We also need \n before the closing } to handle // comments at the end of the last line
101 UString program;
102 if (args.isEmpty())
103 program = "(function() { \n})";
104 else if (args.size() == 1)
105 program = "(function() { " + args.at(0).toString(exec) + "\n})";
106 else {
107 program = "(function(" + args.at(0).toString(exec);
108 for (size_t i = 1; i < args.size() - 1; i++)
109 program += "," + args.at(i).toString(exec);
110 program += ") { " + args.at(args.size() - 1).toString(exec) + "\n})";
111 }
112
113 int errLine;
114 UString errMsg;
115 SourceCode source = makeSource(program, sourceURL, lineNumber);
116 RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
117
118 FunctionBodyNode* body = extractFunctionBody(programNode.get());
119 if (!body)
120 return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());
121
122 JSGlobalObject* globalObject = exec->lexicalGlobalObject();
123 ScopeChain scopeChain(globalObject, globalObject->globalData(), exec->globalThisValue());
124 return new (exec) JSFunction(exec, functionName, body, scopeChain.node());
125 }
126
127 // ECMA 15.3.2 The Function Constructor
constructFunction(ExecState * exec,const ArgList & args)128 JSObject* constructFunction(ExecState* exec, const ArgList& args)
129 {
130 return constructFunction(exec, args, Identifier(exec, "anonymous"), UString(), 1);
131 }
132
133 } // namespace JSC
134