Source/JavaScriptCore/runtime/ConfigFile.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2017 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 "ConfigFile.h"

 #include "Options.h"
 #include <limits.h>
 #include <mutex>
 #include <stdio.h>
 #include <string.h>
 #include <wtf/ASCIICType.h>
 #include <wtf/DataLog.h>
 #include <wtf/text/StringBuilder.h>

 #if HAVE(REGEX_H)
 #include <regex.h>
 #endif

 #if OS(UNIX)
 #include <unistd.h>
 #endif

 namespace JSC {

 static const size_t s_processNameMax = 128;
 char ConfigFile::s_processName[s_processNameMax + 1] = { 0 };
 char ConfigFile::s_parentProcessName[s_processNameMax + 1] = { 0 };

 class ConfigFileScanner {
 public:
     ConfigFileScanner(const char* filename)
         : m_filename(filename)
         , m_lineNumber(0)
     {
         m_srcPtr = &m_buffer[0];
         m_bufferEnd = &m_buffer[0];
     }

     bool start()
     {
         m_file = fopen(m_filename, "r");
         if (!m_file) {
             dataLogF("Failed to open file JSC Config file '%s'.\n", m_filename);
             return false;
         }

         return true;
     }

     unsigned lineNumber()
     {
         return m_lineNumber;
     }

     const char* currentBuffer()
     {
         if (!m_srcPtr || m_srcPtr == m_bufferEnd)
             return "";

         return m_srcPtr;
     }

     bool atFileEnd()
     {
         if (!fillBufferIfNeeded())
             return true;

         return false;
     }

     bool tryConsume(char c)
     {
         if (!fillBufferIfNeeded())
             return false;

         if (c == *m_srcPtr) {
             m_srcPtr++;
             return true;
         }

         return false;
     }

     template <size_t length>
     bool tryConsume(const char (&token) [length])
     {
         if (!fillBufferIfNeeded())
             return false;

         size_t tokenLength = length - 1;
         if (!strncmp(m_srcPtr, token, tokenLength)) {
             m_srcPtr += tokenLength;
             return true;
         }

         return false;
     }

     char* tryConsumeString()
     {
         if (!fillBufferIfNeeded())
             return nullptr;

         if (*m_srcPtr != '"')
             return nullptr;

         char* stringStart = ++m_srcPtr;

         char* stringEnd = strchr(m_srcPtr, '"');
         if (stringEnd) {
             *stringEnd = '\0';
             m_srcPtr = stringEnd + 1;
             return stringStart;
         }

         return nullptr;
     }

     char* tryConsumeRegExPattern(bool& ignoreCase)
     {
         if (!fillBufferIfNeeded())
             return nullptr;

         if (*m_srcPtr != '/')
             return nullptr;

         char* stringStart = m_srcPtr + 1;

         char* stringEnd = strchr(stringStart, '/');
         if (stringEnd) {
             *stringEnd = '\0';
             m_srcPtr = stringEnd + 1;
             if (*m_srcPtr == 'i') {
                 ignoreCase = true;
                 m_srcPtr++;
             } else
                 ignoreCase = false;

             return stringStart;
         }

         return nullptr;
     }

     char* tryConsumeUpto(bool& foundChar, char c)
     {
         if (!fillBufferIfNeeded())
             return nullptr;

         char* start = m_srcPtr;
         foundChar = false;

         char* cPosition = strchr(m_srcPtr, c);
         if (cPosition) {
             *cPosition = '\0';
             m_srcPtr = cPosition + 1;
             foundChar = true;
         } else
             m_srcPtr = m_bufferEnd;

         return start;
     }

 private:
     bool fillBufferIfNeeded()
     {
         if (!m_srcPtr)
             return false;

         while (true) {
             while (m_srcPtr != m_bufferEnd && isASCIISpace(*m_srcPtr))
                 m_srcPtr++;

             if (m_srcPtr != m_bufferEnd)
                 break;

             if (!fillBuffer())
                 return false;
         }

         return true;
     }

     bool fillBuffer()
     {
         do {
             m_srcPtr = fgets(m_buffer, sizeof(m_buffer), m_file);
             if (!m_srcPtr) {
                 fclose(m_file);
                 return false;
             }

             m_lineNumber++;

             m_bufferEnd = strchr(m_srcPtr, '#');

             if (m_bufferEnd)
                 *m_bufferEnd = '\0';
             else {
                 m_bufferEnd = m_srcPtr + strlen(m_srcPtr);
                 if (m_bufferEnd > m_srcPtr && m_bufferEnd[-1] == '\n') {
                     m_bufferEnd--;
                     *m_bufferEnd = '\0';
                 }
             }
         } while (m_bufferEnd == m_srcPtr);

         return true;
     }

     const char* m_filename;
     unsigned m_lineNumber;
     FILE* m_file;
     char m_buffer[BUFSIZ];
     char* m_srcPtr;
     char* m_bufferEnd;
 };

 ConfigFile::ConfigFile(const char* filename)
 {
     if (!filename)
         m_filename[0] = '\0';
     else {
         strncpy(m_filename, filename, s_maxPathLength);
         m_filename[s_maxPathLength] = '\0';
     }

     m_configDirectory[0] = '\0';
 }

 void ConfigFile::setProcessName(const char* processName)
 {
     strncpy(s_processName, processName, s_processNameMax);
 }

 void ConfigFile::setParentProcessName(const char* parentProcessName)
 {
     strncpy(s_parentProcessName, parentProcessName, s_processNameMax);
 }

 void ConfigFile::parse()
 {
     enum StatementNesting { TopLevelStatment, NestedStatement, NestedStatementFailedCriteria };
     enum ParseResult { ParseOK, ParseError, NestedStatementDone };

     canonicalizePaths();

     ConfigFileScanner scanner(m_filename);

     if (!scanner.start())
         return;

     char logPathname[s_maxPathLength + 1] = { 0 };

     StringBuilder jscOptionsBuilder;

     auto parseLogFile = [&](StatementNesting statementNesting) {
         char* filename = nullptr;
         if (scanner.tryConsume('=') && (filename = scanner.tryConsumeString())) {
             if (statementNesting != NestedStatementFailedCriteria) {
                 if (filename[0] != '/') {
                     int spaceRequired = snprintf(logPathname, s_maxPathLength + 1, "%s/%s", m_configDirectory, filename);
                     if (static_cast<unsigned>(spaceRequired) > s_maxPathLength)
                         return ParseError;
                 } else
                     strncpy(logPathname, filename, s_maxPathLength);
             }

             return ParseOK;
         }

         return ParseError;
     };

     auto parseJSCOptions = [&](StatementNesting statementNesting) {
         if (scanner.tryConsume('{')) {
             StringBuilder builder;

             bool foundClosingBrace = false;
             char* currentLine = nullptr;

             while ((currentLine = scanner.tryConsumeUpto(foundClosingBrace, '}'))) {
                 char* p = currentLine;

                 do {
                     if (foundClosingBrace && !*p)
                         break;

                     char* optionNameStart = p;

                     while (*p && !isASCIISpace(*p) && *p != '=')
                         p++;

                     builder.appendCharacters(optionNameStart, p - optionNameStart);

                     while (*p && isASCIISpace(*p) && *p != '=')
                         p++;

                     if (!*p)
                         return ParseError;
                     p++; // Advance past the '='

                     builder.append('=');

                     while (*p && isASCIISpace(*p))
                         p++;

                     if (!*p)
                         return ParseError;

                     char* optionValueStart = p;

                     while (*p && !isASCIISpace(*p))
                         p++;

                     builder.appendCharacters(optionValueStart, p - optionValueStart);
                     builder.append('\n');

                     while (*p && isASCIISpace(*p))
                         p++;
                 } while (*p);

                 if (foundClosingBrace)
                     break;
             }

             if (statementNesting != NestedStatementFailedCriteria)
                 jscOptionsBuilder.append(builder);

             return ParseOK;
         }

         return ParseError;
     };

     auto parseNestedStatement = [&](StatementNesting statementNesting) {
         if (scanner.tryConsume("jscOptions"))
             return parseJSCOptions(statementNesting);

         if (scanner.tryConsume("logFile"))
             return parseLogFile(statementNesting);

         if (scanner.tryConsume('}'))
             return NestedStatementDone;

         return ParseError;
     };

     auto parsePredicate = [&](bool& predicateMatches, const char* matchValue) {
         if (scanner.tryConsume("==")) {
             char* predicateValue = nullptr;
             if ((predicateValue = scanner.tryConsumeString()) && matchValue) {
                 predicateMatches = !strcmp(predicateValue, matchValue);
                 return true;
             }
         }
 #if HAVE(REGEX_H)
         else if (scanner.tryConsume("=~")) {
             char* predicateRegExString = nullptr;
             bool ignoreCase { false };
             if ((predicateRegExString = scanner.tryConsumeRegExPattern(ignoreCase)) && matchValue) {
                 regex_t predicateRegEx;
                 int regexFlags = REG_EXTENDED;
                 if (ignoreCase)
                     regexFlags |= REG_ICASE;
                 if (regcomp(&predicateRegEx, predicateRegExString, regexFlags))
                     return false;

                 predicateMatches = !regexec(&predicateRegEx, matchValue, 0, nullptr, 0);
                 return true;
             }
         }
 #endif

         return false;
     };

     auto parseConditionalBlock = [&](StatementNesting statementNesting) {
         if (statementNesting == NestedStatement) {
             StatementNesting subNesting = NestedStatement;

             while (true) {
                 bool predicateMatches;
                 const char* actualValue = nullptr;

                 if (scanner.tryConsume("processName"))
                     actualValue = s_processName;
                 else if (scanner.tryConsume("parentProcessName"))
                     actualValue = s_parentProcessName;
                 else if (scanner.tryConsume("build"))
 #ifndef NDEBUG
                     actualValue = "Debug";
 #else
                     actualValue = "Release";
 #endif
                 else
                     return ParseError;

                 if (parsePredicate(predicateMatches, actualValue)) {
                     if (!predicateMatches)
                         subNesting = NestedStatementFailedCriteria;

                     if (!scanner.tryConsume("&&"))
                         break;
                 }
             }

             if (!scanner.tryConsume('{'))
                 return ParseError;

             ParseResult parseResult = ParseOK;
             while (parseResult == ParseOK && !scanner.atFileEnd())
                 parseResult = parseNestedStatement(subNesting);

             if (parseResult == NestedStatementDone)
                 return ParseOK;
         }

         return ParseError;
     };

     auto parseStatement = [&](StatementNesting statementNesting) {
         if (scanner.tryConsume("jscOptions"))
             return parseJSCOptions(statementNesting);

         if (scanner.tryConsume("logFile"))
             return parseLogFile(statementNesting);

         if (statementNesting == TopLevelStatment)
             return parseConditionalBlock(NestedStatement);

         return ParseError;
     };

     ParseResult parseResult = ParseOK;

     while (parseResult == ParseOK && !scanner.atFileEnd())
         parseResult = parseStatement(TopLevelStatment);

     if (parseResult == ParseOK) {
         if (strlen(logPathname))
             WTF::setDataFile(logPathname);

         if (!jscOptionsBuilder.isEmpty()) {
             JSC::Config::enableRestrictedOptions();
             Options::setOptions(jscOptionsBuilder.toString().utf8().data());
         }
     } else
         WTF::dataLogF("Error in JSC Config file on or near line %u, parsing '%s'\n", scanner.lineNumber(), scanner.currentBuffer());
 }

 void ConfigFile::canonicalizePaths()
 {
     if (!m_filename[0])
         return;

 #if OS(UNIX) || OS(DARWIN)
     if (m_filename[0] != '/') {
         // Relative path
         char filenameBuffer[s_maxPathLength + 1];

         if (getcwd(filenameBuffer, sizeof(filenameBuffer))) {
             size_t pathnameLength = strlen(filenameBuffer);
             bool shouldAddPathSeparator = filenameBuffer[pathnameLength - 1] != '/';
             if (sizeof(filenameBuffer) - 1  >= pathnameLength + shouldAddPathSeparator) {
                 if (shouldAddPathSeparator)
                     strncat(filenameBuffer, "/", 2); // Room for '/' plus NUL
 #if COMPILER(GCC)
 #if GCC_VERSION_AT_LEAST(8, 0, 0)
                 IGNORE_WARNINGS_BEGIN("stringop-truncation")
 #endif
 #endif
                 strncat(filenameBuffer, m_filename, sizeof(filenameBuffer) - strlen(filenameBuffer) - 1);
 #if COMPILER(GCC)
 #if GCC_VERSION_AT_LEAST(8, 0, 0)
                 IGNORE_WARNINGS_END
 #endif
 #endif
                 strncpy(m_filename, filenameBuffer, s_maxPathLength);
                 m_filename[s_maxPathLength] = '\0';
             }
         }
     }
 #endif

     char* lastPathSeperator = strrchr(m_filename, '/');

     if (lastPathSeperator) {
         unsigned dirnameLength = lastPathSeperator - &m_filename[0];
         strncpy(m_configDirectory, m_filename, dirnameLength);
         m_configDirectory[dirnameLength] = '\0';
     } else {
         m_configDirectory[0] = '/';
         m_configDirectory[1] = '\0';
     }
 }

 void processConfigFile(const char* configFilename, const char* processName, const char* parentProcessName)
 {
     static std::once_flag processConfigFileOnceFlag;

     if (!configFilename || !strlen(configFilename))
         return;

     std::call_once(processConfigFileOnceFlag, [&]{
         if (configFilename) {
             ConfigFile configFile(configFilename);
             configFile.setProcessName(processName);
             if (parentProcessName)
                 configFile.setParentProcessName(parentProcessName);
             configFile.parse();
         }
     });
 }

 } // namespace JSC
	/*
	* Copyright (C) 2017 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 "ConfigFile.h"

	#include "Options.h"
	#include <limits.h>
	#include <mutex>
	#include <stdio.h>
	#include <string.h>
	#include <wtf/ASCIICType.h>
	#include <wtf/DataLog.h>
	#include <wtf/text/StringBuilder.h>

	#if HAVE(REGEX_H)
	#include <regex.h>
	#endif

	#if OS(UNIX)
	#include <unistd.h>
	#endif

	namespace JSC {

	static const size_t s_processNameMax = 128;
	char ConfigFile::s_processName[s_processNameMax + 1] = { 0 };
	char ConfigFile::s_parentProcessName[s_processNameMax + 1] = { 0 };

	class ConfigFileScanner {
	public:
	ConfigFileScanner(const char* filename)
	: m_filename(filename)
	, m_lineNumber(0)
	{
	m_srcPtr = &m_buffer[0];
	m_bufferEnd = &m_buffer[0];
	}

	bool start()
	{
	m_file = fopen(m_filename, "r");
	if (!m_file) {
	dataLogF("Failed to open file JSC Config file '%s'.\n", m_filename);
	return false;
	}

	return true;
	}

	unsigned lineNumber()
	{
	return m_lineNumber;
	}

	const char* currentBuffer()
	{
	if (!m_srcPtr \|\| m_srcPtr == m_bufferEnd)
	return "";

	return m_srcPtr;
	}

	bool atFileEnd()
	{
	if (!fillBufferIfNeeded())
	return true;

	return false;
	}

	bool tryConsume(char c)
	{
	if (!fillBufferIfNeeded())
	return false;

	if (c == *m_srcPtr) {
	m_srcPtr++;
	return true;
	}

	return false;
	}

	template <size_t length>
	bool tryConsume(const char (&token) [length])
	{
	if (!fillBufferIfNeeded())
	return false;

	size_t tokenLength = length - 1;
	if (!strncmp(m_srcPtr, token, tokenLength)) {
	m_srcPtr += tokenLength;
	return true;
	}

	return false;
	}

	char* tryConsumeString()
	{
	if (!fillBufferIfNeeded())
	return nullptr;

	if (*m_srcPtr != '"')
	return nullptr;

	char* stringStart = ++m_srcPtr;

	char* stringEnd = strchr(m_srcPtr, '"');
	if (stringEnd) {
	*stringEnd = '\0';
	m_srcPtr = stringEnd + 1;
	return stringStart;
	}

	return nullptr;
	}

	char* tryConsumeRegExPattern(bool& ignoreCase)
	{
	if (!fillBufferIfNeeded())
	return nullptr;

	if (*m_srcPtr != '/')
	return nullptr;

	char* stringStart = m_srcPtr + 1;

	char* stringEnd = strchr(stringStart, '/');
	if (stringEnd) {
	*stringEnd = '\0';
	m_srcPtr = stringEnd + 1;
	if (*m_srcPtr == 'i') {
	ignoreCase = true;
	m_srcPtr++;
	} else
	ignoreCase = false;

	return stringStart;
	}

	return nullptr;
	}

	char* tryConsumeUpto(bool& foundChar, char c)
	{
	if (!fillBufferIfNeeded())
	return nullptr;

	char* start = m_srcPtr;
	foundChar = false;

	char* cPosition = strchr(m_srcPtr, c);
	if (cPosition) {
	*cPosition = '\0';
	m_srcPtr = cPosition + 1;
	foundChar = true;
	} else
	m_srcPtr = m_bufferEnd;

	return start;
	}

	private:
	bool fillBufferIfNeeded()
	{
	if (!m_srcPtr)
	return false;

	while (true) {
	while (m_srcPtr != m_bufferEnd && isASCIISpace(*m_srcPtr))
	m_srcPtr++;

	if (m_srcPtr != m_bufferEnd)
	break;

	if (!fillBuffer())
	return false;
	}

	return true;
	}

	bool fillBuffer()
	{
	do {
	m_srcPtr = fgets(m_buffer, sizeof(m_buffer), m_file);
	if (!m_srcPtr) {
	fclose(m_file);
	return false;
	}

	m_lineNumber++;

	m_bufferEnd = strchr(m_srcPtr, '#');

	if (m_bufferEnd)
	*m_bufferEnd = '\0';
	else {
	m_bufferEnd = m_srcPtr + strlen(m_srcPtr);
	if (m_bufferEnd > m_srcPtr && m_bufferEnd[-1] == '\n') {
	m_bufferEnd--;
	*m_bufferEnd = '\0';
	}
	}
	} while (m_bufferEnd == m_srcPtr);

	return true;
	}

	const char* m_filename;
	unsigned m_lineNumber;
	FILE* m_file;
	char m_buffer[BUFSIZ];
	char* m_srcPtr;
	char* m_bufferEnd;
	};

	ConfigFile::ConfigFile(const char* filename)
	{
	if (!filename)
	m_filename[0] = '\0';
	else {
	strncpy(m_filename, filename, s_maxPathLength);
	m_filename[s_maxPathLength] = '\0';
	}

	m_configDirectory[0] = '\0';
	}

	void ConfigFile::setProcessName(const char* processName)
	{
	strncpy(s_processName, processName, s_processNameMax);
	}

	void ConfigFile::setParentProcessName(const char* parentProcessName)
	{
	strncpy(s_parentProcessName, parentProcessName, s_processNameMax);
	}

	void ConfigFile::parse()
	{
	enum StatementNesting { TopLevelStatment, NestedStatement, NestedStatementFailedCriteria };
	enum ParseResult { ParseOK, ParseError, NestedStatementDone };

	canonicalizePaths();

	ConfigFileScanner scanner(m_filename);

	if (!scanner.start())
	return;

	char logPathname[s_maxPathLength + 1] = { 0 };

	StringBuilder jscOptionsBuilder;

	auto parseLogFile = [&](StatementNesting statementNesting) {
	char* filename = nullptr;
	if (scanner.tryConsume('=') && (filename = scanner.tryConsumeString())) {
	if (statementNesting != NestedStatementFailedCriteria) {
	if (filename[0] != '/') {
	int spaceRequired = snprintf(logPathname, s_maxPathLength + 1, "%s/%s", m_configDirectory, filename);
	if (static_cast<unsigned>(spaceRequired) > s_maxPathLength)
	return ParseError;
	} else
	strncpy(logPathname, filename, s_maxPathLength);
	}

	return ParseOK;
	}

	return ParseError;
	};

	auto parseJSCOptions = [&](StatementNesting statementNesting) {
	if (scanner.tryConsume('{')) {
	StringBuilder builder;

	bool foundClosingBrace = false;
	char* currentLine = nullptr;

	while ((currentLine = scanner.tryConsumeUpto(foundClosingBrace, '}'))) {
	char* p = currentLine;

	do {
	if (foundClosingBrace && !*p)
	break;

	char* optionNameStart = p;

	while (p && !isASCIISpace(p) && *p != '=')
	p++;

	builder.appendCharacters(optionNameStart, p - optionNameStart);

	while (p && isASCIISpace(p) && *p != '=')
	p++;

	if (!*p)
	return ParseError;
	p++; // Advance past the '='

	builder.append('=');

	while (p && isASCIISpace(p))
	p++;

	if (!*p)
	return ParseError;

	char* optionValueStart = p;

	while (p && !isASCIISpace(p))
	p++;

	builder.appendCharacters(optionValueStart, p - optionValueStart);
	builder.append('\n');

	while (p && isASCIISpace(p))
	p++;
	} while (*p);

	if (foundClosingBrace)
	break;
	}

	if (statementNesting != NestedStatementFailedCriteria)
	jscOptionsBuilder.append(builder);

	return ParseOK;
	}

	return ParseError;
	};

	auto parseNestedStatement = [&](StatementNesting statementNesting) {
	if (scanner.tryConsume("jscOptions"))
	return parseJSCOptions(statementNesting);

	if (scanner.tryConsume("logFile"))
	return parseLogFile(statementNesting);

	if (scanner.tryConsume('}'))
	return NestedStatementDone;

	return ParseError;
	};

	auto parsePredicate = [&](bool& predicateMatches, const char* matchValue) {
	if (scanner.tryConsume("==")) {
	char* predicateValue = nullptr;
	if ((predicateValue = scanner.tryConsumeString()) && matchValue) {
	predicateMatches = !strcmp(predicateValue, matchValue);
	return true;
	}
	}
	#if HAVE(REGEX_H)
	else if (scanner.tryConsume("=~")) {
	char* predicateRegExString = nullptr;
	bool ignoreCase { false };
	if ((predicateRegExString = scanner.tryConsumeRegExPattern(ignoreCase)) && matchValue) {
	regex_t predicateRegEx;
	int regexFlags = REG_EXTENDED;
	if (ignoreCase)
	regexFlags \|= REG_ICASE;
	if (regcomp(&predicateRegEx, predicateRegExString, regexFlags))
	return false;

	predicateMatches = !regexec(&predicateRegEx, matchValue, 0, nullptr, 0);
	return true;
	}
	}
	#endif

	return false;
	};

	auto parseConditionalBlock = [&](StatementNesting statementNesting) {
	if (statementNesting == NestedStatement) {
	StatementNesting subNesting = NestedStatement;

	while (true) {
	bool predicateMatches;
	const char* actualValue = nullptr;

	if (scanner.tryConsume("processName"))
	actualValue = s_processName;
	else if (scanner.tryConsume("parentProcessName"))
	actualValue = s_parentProcessName;
	else if (scanner.tryConsume("build"))
	#ifndef NDEBUG
	actualValue = "Debug";
	#else
	actualValue = "Release";
	#endif
	else
	return ParseError;

	if (parsePredicate(predicateMatches, actualValue)) {
	if (!predicateMatches)
	subNesting = NestedStatementFailedCriteria;

	if (!scanner.tryConsume("&&"))
	break;
	}
	}

	if (!scanner.tryConsume('{'))
	return ParseError;

	ParseResult parseResult = ParseOK;
	while (parseResult == ParseOK && !scanner.atFileEnd())
	parseResult = parseNestedStatement(subNesting);

	if (parseResult == NestedStatementDone)
	return ParseOK;
	}

	return ParseError;
	};

	auto parseStatement = [&](StatementNesting statementNesting) {
	if (scanner.tryConsume("jscOptions"))
	return parseJSCOptions(statementNesting);

	if (scanner.tryConsume("logFile"))
	return parseLogFile(statementNesting);

	if (statementNesting == TopLevelStatment)
	return parseConditionalBlock(NestedStatement);

	return ParseError;
	};

	ParseResult parseResult = ParseOK;

	while (parseResult == ParseOK && !scanner.atFileEnd())
	parseResult = parseStatement(TopLevelStatment);

	if (parseResult == ParseOK) {
	if (strlen(logPathname))
	WTF::setDataFile(logPathname);

	if (!jscOptionsBuilder.isEmpty()) {
	JSC::Config::enableRestrictedOptions();
	Options::setOptions(jscOptionsBuilder.toString().utf8().data());
	}
	} else
	WTF::dataLogF("Error in JSC Config file on or near line %u, parsing '%s'\n", scanner.lineNumber(), scanner.currentBuffer());
	}

	void ConfigFile::canonicalizePaths()
	{
	if (!m_filename[0])
	return;

	#if OS(UNIX) \|\| OS(DARWIN)
	if (m_filename[0] != '/') {
	// Relative path
	char filenameBuffer[s_maxPathLength + 1];

	if (getcwd(filenameBuffer, sizeof(filenameBuffer))) {
	size_t pathnameLength = strlen(filenameBuffer);
	bool shouldAddPathSeparator = filenameBuffer[pathnameLength - 1] != '/';
	if (sizeof(filenameBuffer) - 1 >= pathnameLength + shouldAddPathSeparator) {
	if (shouldAddPathSeparator)
	strncat(filenameBuffer, "/", 2); // Room for '/' plus NUL
	#if COMPILER(GCC)
	#if GCC_VERSION_AT_LEAST(8, 0, 0)
	IGNORE_WARNINGS_BEGIN("stringop-truncation")
	#endif
	#endif
	strncat(filenameBuffer, m_filename, sizeof(filenameBuffer) - strlen(filenameBuffer) - 1);
	#if COMPILER(GCC)
	#if GCC_VERSION_AT_LEAST(8, 0, 0)
	IGNORE_WARNINGS_END
	#endif
	#endif
	strncpy(m_filename, filenameBuffer, s_maxPathLength);
	m_filename[s_maxPathLength] = '\0';
	}
	}
	}
	#endif

	char* lastPathSeperator = strrchr(m_filename, '/');

	if (lastPathSeperator) {
	unsigned dirnameLength = lastPathSeperator - &m_filename[0];
	strncpy(m_configDirectory, m_filename, dirnameLength);
	m_configDirectory[dirnameLength] = '\0';
	} else {
	m_configDirectory[0] = '/';
	m_configDirectory[1] = '\0';
	}
	}

	void processConfigFile(const char* configFilename, const char* processName, const char* parentProcessName)
	{
	static std::once_flag processConfigFileOnceFlag;

	if (!configFilename \|\| !strlen(configFilename))
	return;

	std::call_once(processConfigFileOnceFlag, [&]{
	if (configFilename) {
	ConfigFile configFile(configFilename);
	configFile.setProcessName(processName);
	if (parentProcessName)
	configFile.setParentProcessName(parentProcessName);
	configFile.parse();
	}
	});
	}

	} // namespace JSC