[apple/javascriptcore.git] / runtime / Executable.cpp

/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "Executable.h"

#include "BytecodeGenerator.h"
#include "CodeBlock.h"
#include "JIT.h"
#include "Parser.h"
#include "StringBuilder.h"
#include "Vector.h"

namespace JSC {

#if ENABLE(JIT)
NativeExecutable::~NativeExecutable()
{
}
#endif

VPtrHackExecutable::~VPtrHackExecutable()
{
}

EvalExecutable::~EvalExecutable()
{
    delete m_evalCodeBlock;
}

ProgramExecutable::~ProgramExecutable()
{
    delete m_programCodeBlock;
}

FunctionExecutable::~FunctionExecutable()
{
    delete m_codeBlock;
}

JSObject* EvalExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
{
    int errLine;
    UString errMsg;
    RefPtr<EvalNode> evalNode = exec->globalData().parser->parse<EvalNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
    if (!evalNode)
        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
    recordParse(evalNode->features(), evalNode->lineNo(), evalNode->lastLine());

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();

    ASSERT(!m_evalCodeBlock);
    m_evalCodeBlock = new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth());
    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(evalNode.get(), globalObject->debugger(), scopeChain, m_evalCodeBlock->symbolTable(), m_evalCodeBlock));
    generator->generate();
    
    evalNode->destroyData();
    return 0;
}

JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
{
    int errLine;
    UString errMsg;
    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
    if (!programNode)
        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
    return 0;
}

JSObject* ProgramExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
{
    int errLine;
    UString errMsg;
    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
    if (!programNode)
        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
    recordParse(programNode->features(), programNode->lineNo(), programNode->lastLine());

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();
    
    ASSERT(!m_programCodeBlock);
    m_programCodeBlock = new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider());
    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(programNode.get(), globalObject->debugger(), scopeChain, &globalObject->symbolTable(), m_programCodeBlock));
    generator->generate();

    programNode->destroyData();
    return 0;
}

void FunctionExecutable::compile(ExecState*, ScopeChainNode* scopeChainNode)
{
    JSGlobalData* globalData = scopeChainNode->globalData;
    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
    if (m_forceUsesArguments)
        body->setUsesArguments();
    body->finishParsing(m_parameters, m_name);
    recordParse(body->features(), body->lineNo(), body->lastLine());

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();

    ASSERT(!m_codeBlock);
    m_codeBlock = new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset());
    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(body.get(), globalObject->debugger(), scopeChain, m_codeBlock->symbolTable(), m_codeBlock));
    generator->generate();
    m_numParameters = m_codeBlock->m_numParameters;
    ASSERT(m_numParameters);
    m_numVariables = m_codeBlock->m_numVars;

    body->destroyData();
}

#if ENABLE(JIT)

void EvalExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
{
    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);

#if !ENABLE(OPCODE_SAMPLING)
    if (!BytecodeGenerator::dumpsGeneratedCode())
        codeBlock->discardBytecode();
#endif
}

void ProgramExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
{
    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);

#if !ENABLE(OPCODE_SAMPLING)
    if (!BytecodeGenerator::dumpsGeneratedCode())
        codeBlock->discardBytecode();
#endif
}

void FunctionExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
{
    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);

#if !ENABLE(OPCODE_SAMPLING)
    if (!BytecodeGenerator::dumpsGeneratedCode())
        codeBlock->discardBytecode();
#endif
}

#endif

void FunctionExecutable::markAggregate(MarkStack& markStack)
{
    if (m_codeBlock)
        m_codeBlock->markAggregate(markStack);
}

ExceptionInfo* FunctionExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
{
    RefPtr<FunctionBodyNode> newFunctionBody = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
    if (m_forceUsesArguments)
        newFunctionBody->setUsesArguments();
    newFunctionBody->finishParsing(m_parameters, m_name);

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();

    OwnPtr<CodeBlock> newCodeBlock(new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset()));
    globalData->functionCodeBlockBeingReparsed = newCodeBlock.get();

    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newFunctionBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
    generator->setRegeneratingForExceptionInfo(static_cast<FunctionCodeBlock*>(codeBlock));
    generator->generate();

    ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());

#if ENABLE(JIT)
    JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get());
    ASSERT(newJITCode.size() == generatedJITCode().size());
#endif

    globalData->functionCodeBlockBeingReparsed = 0;

    return newCodeBlock->extractExceptionInfo();
}

ExceptionInfo* EvalExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
{
    RefPtr<EvalNode> newEvalBody = globalData->parser->parse<EvalNode>(globalData, 0, 0, m_source);

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();

    OwnPtr<EvalCodeBlock> newCodeBlock(new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth()));

    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newEvalBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
    generator->setRegeneratingForExceptionInfo(static_cast<EvalCodeBlock*>(codeBlock));
    generator->generate();

    ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());

#if ENABLE(JIT)
    JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get());
    ASSERT(newJITCode.size() == generatedJITCode().size());
#endif

    return newCodeBlock->extractExceptionInfo();
}

void FunctionExecutable::recompile(ExecState*)
{
    delete m_codeBlock;
    m_codeBlock = 0;
    m_numParameters = NUM_PARAMETERS_NOT_COMPILED;
#if ENABLE(JIT)
    m_jitCode = JITCode();
#endif
}

PassRefPtr<FunctionExecutable> FunctionExecutable::fromGlobalCode(const Identifier& functionName, ExecState* exec, Debugger* debugger, const SourceCode& source, int* errLine, UString* errMsg)
{
    RefPtr<ProgramNode> program = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), debugger, exec, source, errLine, errMsg);
    if (!program)
        return 0;

    StatementNode* exprStatement = program->singleStatement();
    ASSERT(exprStatement);
    ASSERT(exprStatement->isExprStatement());
    if (!exprStatement || !exprStatement->isExprStatement())
        return 0;

    ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
    ASSERT(funcExpr);
    ASSERT(funcExpr->isFuncExprNode());
    if (!funcExpr || !funcExpr->isFuncExprNode())
        return 0;

    FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
    ASSERT(body);
    return FunctionExecutable::create(&exec->globalData(), functionName, body->source(), body->usesArguments(), body->parameters(), body->lineNo(), body->lastLine());
}

UString FunctionExecutable::paramString() const
{
    FunctionParameters& parameters = *m_parameters;
    StringBuilder builder;
    for (size_t pos = 0; pos < parameters.size(); ++pos) {
        if (!builder.isEmpty())
            builder.append(", ");
        builder.append(parameters[pos].ustring());
    }
    return builder.release();
}

};
Commit	Line	Data
f9bf01c6 A	1	/*
	2	* Copyright (C) 2009 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "config.h"
	27	#include "Executable.h"
	28
	29	#include "BytecodeGenerator.h"
	30	#include "CodeBlock.h"
	31	#include "JIT.h"
	32	#include "Parser.h"
	33	#include "StringBuilder.h"
	34	#include "Vector.h"
	35
	36	namespace JSC {
	37
	38	#if ENABLE(JIT)
	39	NativeExecutable::~NativeExecutable()
	40	{
	41	}
	42	#endif
	43
	44	VPtrHackExecutable::~VPtrHackExecutable()
	45	{
	46	}
	47
	48	EvalExecutable::~EvalExecutable()
	49	{
	50	delete m_evalCodeBlock;
	51	}
	52
	53	ProgramExecutable::~ProgramExecutable()
	54	{
	55	delete m_programCodeBlock;
	56	}
	57
	58	FunctionExecutable::~FunctionExecutable()
	59	{
	60	delete m_codeBlock;
	61	}
	62
	63	JSObject* EvalExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
	64	{
65	int errLine;
66	UString errMsg;
67	RefPtr<EvalNode> evalNode = exec->globalData().parser->parse<EvalNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
68	if (!evalNode)
69	return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
70	recordParse(evalNode->features(), evalNode->lineNo(), evalNode->lastLine());
71
72	ScopeChain scopeChain(scopeChainNode);
73	JSGlobalObject* globalObject = scopeChain.globalObject();
74
75	ASSERT(!m_evalCodeBlock);
76	m_evalCodeBlock = new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth());
77	OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(evalNode.get(), globalObject->debugger(), scopeChain, m_evalCodeBlock->symbolTable(), m_evalCodeBlock));
78	generator->generate();
79
80	evalNode->destroyData();
81	return 0;
82	}
83
84	JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
85	{
86	int errLine;
87	UString errMsg;
88	RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
89	if (!programNode)
90	return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
91	return 0;
92	}
93
94	JSObject* ProgramExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
95	{
96	int errLine;
97	UString errMsg;
98	RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
99	if (!programNode)
100	return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
101	recordParse(programNode->features(), programNode->lineNo(), programNode->lastLine());
102
103	ScopeChain scopeChain(scopeChainNode);
104	JSGlobalObject* globalObject = scopeChain.globalObject();
105
106	ASSERT(!m_programCodeBlock);
107	m_programCodeBlock = new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider());
108	OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(programNode.get(), globalObject->debugger(), scopeChain, &globalObject->symbolTable(), m_programCodeBlock));
109	generator->generate();
110
111	programNode->destroyData();
112	return 0;
113	}
114
115	void FunctionExecutable::compile(ExecState, ScopeChainNode scopeChainNode)
116	{
117	JSGlobalData* globalData = scopeChainNode->globalData;
118	RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
119	if (m_forceUsesArguments)
120	body->setUsesArguments();
121	body->finishParsing(m_parameters, m_name);
122	recordParse(body->features(), body->lineNo(), body->lastLine());
123
124	ScopeChain scopeChain(scopeChainNode);
125	JSGlobalObject* globalObject = scopeChain.globalObject();
126
127	ASSERT(!m_codeBlock);
128	m_codeBlock = new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset());
129	OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(body.get(), globalObject->debugger(), scopeChain, m_codeBlock->symbolTable(), m_codeBlock));
130	generator->generate();
131	m_numParameters = m_codeBlock->m_numParameters;
132	ASSERT(m_numParameters);
133	m_numVariables = m_codeBlock->m_numVars;
134
135	body->destroyData();
136	}
137
138	#if ENABLE(JIT)
139
140	void EvalExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
141	{
142	CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
143	m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
144
145	#if !ENABLE(OPCODE_SAMPLING)
146	if (!BytecodeGenerator::dumpsGeneratedCode())
147	codeBlock->discardBytecode();
148	#endif
149	}
150
151	void ProgramExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
152	{
153	CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
154	m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
155
156	#if !ENABLE(OPCODE_SAMPLING)
157	if (!BytecodeGenerator::dumpsGeneratedCode())
158	codeBlock->discardBytecode();
159	#endif
160	}
161
162	void FunctionExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
163	{
164	CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
165	m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
166
167	#if !ENABLE(OPCODE_SAMPLING)
168	if (!BytecodeGenerator::dumpsGeneratedCode())
169	codeBlock->discardBytecode();
170	#endif
171	}
172
173	#endif
174
175	void FunctionExecutable::markAggregate(MarkStack& markStack)
176	{
177	if (m_codeBlock)
178	m_codeBlock->markAggregate(markStack);
179	}
180
181	ExceptionInfo* FunctionExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
182	{
183	RefPtr<FunctionBodyNode> newFunctionBody = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
184	if (m_forceUsesArguments)
185	newFunctionBody->setUsesArguments();
186	newFunctionBody->finishParsing(m_parameters, m_name);
187
188	ScopeChain scopeChain(scopeChainNode);
189	JSGlobalObject* globalObject = scopeChain.globalObject();
190
191	OwnPtr<CodeBlock> newCodeBlock(new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset()));
192	globalData->functionCodeBlockBeingReparsed = newCodeBlock.get();
193
194	OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newFunctionBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
195	generator->setRegeneratingForExceptionInfo(static_cast<FunctionCodeBlock*>(codeBlock));
196	generator->generate();
197
198	ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());
199
200	#if ENABLE(JIT)
201	JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get());
202	ASSERT(newJITCode.size() == generatedJITCode().size());
203	#endif
204
205	globalData->functionCodeBlockBeingReparsed = 0;
206
207	return newCodeBlock->extractExceptionInfo();
208	}
209
210	ExceptionInfo* EvalExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
211	{
212	RefPtr<EvalNode> newEvalBody = globalData->parser->parse<EvalNode>(globalData, 0, 0, m_source);
213
214	ScopeChain scopeChain(scopeChainNode);
215	JSGlobalObject* globalObject = scopeChain.globalObject();
216
217	OwnPtr<EvalCodeBlock> newCodeBlock(new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth()));
218
219	OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newEvalBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
220	generator->setRegeneratingForExceptionInfo(static_cast<EvalCodeBlock*>(codeBlock));
221	generator->generate();
222
223	ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());
224
225	#if ENABLE(JIT)
226	JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get());
227	ASSERT(newJITCode.size() == generatedJITCode().size());
228	#endif
229
230	return newCodeBlock->extractExceptionInfo();
231	}
232
233	void FunctionExecutable::recompile(ExecState*)
234	{
235	delete m_codeBlock;
236	m_codeBlock = 0;
237	m_numParameters = NUM_PARAMETERS_NOT_COMPILED;
238	#if ENABLE(JIT)
239	m_jitCode = JITCode();
240	#endif
241	}
242
243	PassRefPtr<FunctionExecutable> FunctionExecutable::fromGlobalCode(const Identifier& functionName, ExecState* exec, Debugger* debugger, const SourceCode& source, int* errLine, UString* errMsg)
244	{
245	RefPtr<ProgramNode> program = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), debugger, exec, source, errLine, errMsg);
246	if (!program)
247	return 0;
248
249	StatementNode* exprStatement = program->singleStatement();
250	ASSERT(exprStatement);
251	ASSERT(exprStatement->isExprStatement());
252	if (!exprStatement \|\| !exprStatement->isExprStatement())
253	return 0;
254
255	ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
256	ASSERT(funcExpr);
257	ASSERT(funcExpr->isFuncExprNode());
258	if (!funcExpr \|\| !funcExpr->isFuncExprNode())
259	return 0;
260
261	FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
262	ASSERT(body);
263	return FunctionExecutable::create(&exec->globalData(), functionName, body->source(), body->usesArguments(), body->parameters(), body->lineNo(), body->lastLine());
264	}
265
266	UString FunctionExecutable::paramString() const
267	{
268	FunctionParameters& parameters = *m_parameters;
269	StringBuilder builder;
270	for (size_t pos = 0; pos < parameters.size(); ++pos) {
271	if (!builder.isEmpty())
272	builder.append(", ");
273	builder.append(parameters[pos].ustring());
274	}
275	return builder.release();
276	}
277
278	};
279
280