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430 lines
13 KiB
C++
430 lines
13 KiB
C++
/*=========================================================================
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Program: CMake - Cross-Platform Makefile Generator
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Module: $RCSfile$
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Language: C++
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Date: $Date$
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Version: $Revision$
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Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
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See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notices for more information.
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=========================================================================*/
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#include "cmDependsC.h"
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#include "cmFileTimeComparison.h"
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#include "cmLocalGenerator.h"
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#include "cmSystemTools.h"
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#include <ctype.h> // isspace
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#define INCLUDE_REGEX_LINE \
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"^[ \t]*#[ \t]*(include|import)[ \t]*[<\"]([^\">]+)([\">])"
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#define INCLUDE_REGEX_LINE_MARKER "#IncludeRegexLine: "
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#define INCLUDE_REGEX_SCAN_MARKER "#IncludeRegexScan: "
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#define INCLUDE_REGEX_COMPLAIN_MARKER "#IncludeRegexComplain: "
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//----------------------------------------------------------------------------
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cmDependsC::cmDependsC():
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IncludePath(0)
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{
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}
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//----------------------------------------------------------------------------
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// yummy look at all those constructor arguments
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cmDependsC::cmDependsC(std::vector<std::string> const& includes,
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const char* scanRegex, const char* complainRegex,
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const cmStdString& cacheFileName):
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IncludePath(&includes),
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IncludeRegexLine(INCLUDE_REGEX_LINE),
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IncludeRegexScan(scanRegex),
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IncludeRegexComplain(complainRegex),
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IncludeRegexLineString(INCLUDE_REGEX_LINE_MARKER INCLUDE_REGEX_LINE),
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IncludeRegexScanString(std::string(INCLUDE_REGEX_SCAN_MARKER)+scanRegex),
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IncludeRegexComplainString(
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std::string(INCLUDE_REGEX_COMPLAIN_MARKER)+complainRegex),
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CacheFileName(cacheFileName)
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{
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this->ReadCacheFile();
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}
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//----------------------------------------------------------------------------
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cmDependsC::~cmDependsC()
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{
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this->WriteCacheFile();
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for (std::map<cmStdString, cmIncludeLines*>::iterator it=
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this->FileCache.begin(); it!=this->FileCache.end(); ++it)
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{
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delete it->second;
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}
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}
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//----------------------------------------------------------------------------
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bool cmDependsC::WriteDependencies(const char *src, const char *obj,
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std::ostream& makeDepends, std::ostream& internalDepends)
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{
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// Make sure this is a scanning instance.
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if(!src || src[0] == '\0')
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{
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cmSystemTools::Error("Cannot scan dependencies without a source file.");
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return false;
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}
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if(!obj || obj[0] == '\0')
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{
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cmSystemTools::Error("Cannot scan dependencies without an object file.");
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return false;
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}
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if(!this->IncludePath)
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{
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cmSystemTools::Error("Cannot scan dependencies without an include path.");
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return false;
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}
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// Walk the dependency graph starting with the source file.
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bool first = true;
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UnscannedEntry root;
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root.FileName = src;
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this->Unscanned.push(root);
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this->Encountered.clear();
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this->Encountered.insert(src);
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std::set<cmStdString> dependencies;
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std::set<cmStdString> scanned;
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// Use reserve to allocate enough memory for both strings,
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// so that during the loops no memory is allocated or freed
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std::string cacheKey;
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cacheKey.reserve(4*1024);
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std::string tempPathStr;
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tempPathStr.reserve(4*1024);
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while(!this->Unscanned.empty())
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{
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// Get the next file to scan.
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UnscannedEntry current = this->Unscanned.front();
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this->Unscanned.pop();
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// If not a full path, find the file in the include path.
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std::string fullName;
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if(first || cmSystemTools::FileIsFullPath(current.FileName.c_str()))
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{
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if(cmSystemTools::FileExists(current.FileName.c_str()))
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{
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fullName = current.FileName;
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}
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}
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else if(!current.QuotedLocation.empty() &&
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cmSystemTools::FileExists(current.QuotedLocation.c_str()))
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{
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// The include statement producing this entry was a double-quote
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// include and the included file is present in the directory of
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// the source containing the include statement.
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fullName = current.QuotedLocation;
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}
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else
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{
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// With GCC distribution of STL, assigning to a string directly
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// throws away the internal buffer of the left-hand-side. We
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// want to keep the pre-allocated buffer so we use C-style
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// string assignment and then operator+=. We could call
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// .clear() instead of assigning to an empty string but the
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// method does not exist on some older compilers.
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cacheKey = "";
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cacheKey += current.FileName;
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for(std::vector<std::string>::const_iterator i =
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this->IncludePath->begin(); i != this->IncludePath->end(); ++i)
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{
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cacheKey+=*i;
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}
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std::map<cmStdString, cmStdString>::iterator
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headerLocationIt=this->HeaderLocationCache.find(cacheKey);
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if (headerLocationIt!=this->HeaderLocationCache.end())
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{
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fullName=headerLocationIt->second;
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}
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else for(std::vector<std::string>::const_iterator i =
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this->IncludePath->begin(); i != this->IncludePath->end(); ++i)
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{
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// Construct the name of the file as if it were in the current
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// include directory. Avoid using a leading "./".
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tempPathStr = "";
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if((*i) == ".")
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{
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tempPathStr += current.FileName;
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}
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else
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{
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tempPathStr += *i;
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tempPathStr+="/";
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tempPathStr+=current.FileName;
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}
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// Look for the file in this location.
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if(cmSystemTools::FileExists(tempPathStr.c_str()))
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{
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fullName = tempPathStr;
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HeaderLocationCache[cacheKey]=fullName;
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break;
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}
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}
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}
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// Complain if the file cannot be found and matches the complain
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// regex.
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if(fullName.empty() &&
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this->IncludeRegexComplain.find(current.FileName.c_str()))
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{
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cmSystemTools::Error("Cannot find file \"",
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current.FileName.c_str(), "\".");
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return false;
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}
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// Scan the file if it was found and has not been scanned already.
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if(!fullName.empty() && (scanned.find(fullName) == scanned.end()))
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{
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// Record scanned files.
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scanned.insert(fullName);
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// Check whether this file is already in the cache
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std::map<cmStdString, cmIncludeLines*>::iterator fileIt=
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this->FileCache.find(fullName);
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if (fileIt!=this->FileCache.end())
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{
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fileIt->second->Used=true;
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dependencies.insert(fullName);
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for (std::vector<UnscannedEntry>::const_iterator incIt=
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fileIt->second->UnscannedEntries.begin();
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incIt!=fileIt->second->UnscannedEntries.end(); ++incIt)
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{
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if (this->Encountered.find(incIt->FileName) ==
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this->Encountered.end())
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{
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this->Encountered.insert(incIt->FileName);
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this->Unscanned.push(*incIt);
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}
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}
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}
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else
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{
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// Try to scan the file. Just leave it out if we cannot find
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// it.
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std::ifstream fin(fullName.c_str());
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if(fin)
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{
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// Add this file as a dependency.
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dependencies.insert(fullName);
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// Scan this file for new dependencies. Pass the directory
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// containing the file to handle double-quote includes.
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std::string dir = cmSystemTools::GetFilenamePath(fullName);
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this->Scan(fin, dir.c_str(), fullName);
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}
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}
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}
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first = false;
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}
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// Write the dependencies to the output stream. Makefile rules
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// written by the original local generator for this directory
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// convert the dependencies to paths relative to the home output
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// directory. We must do the same here.
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internalDepends << obj << std::endl;
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for(std::set<cmStdString>::iterator i=dependencies.begin();
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i != dependencies.end(); ++i)
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{
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makeDepends << obj << ": " <<
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this->LocalGenerator->Convert(i->c_str(),
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cmLocalGenerator::HOME_OUTPUT,
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cmLocalGenerator::MAKEFILE)
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<< std::endl;
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internalDepends << " " << i->c_str() << std::endl;
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}
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makeDepends << std::endl;
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return true;
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}
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//----------------------------------------------------------------------------
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void cmDependsC::ReadCacheFile()
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{
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if(this->CacheFileName.size() == 0)
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{
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return;
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}
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std::ifstream fin(this->CacheFileName.c_str());
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if(!fin)
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{
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return;
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}
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std::string line;
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cmIncludeLines* cacheEntry=0;
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bool haveFileName=false;
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while(cmSystemTools::GetLineFromStream(fin, line))
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{
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if (line.empty())
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{
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cacheEntry=0;
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haveFileName=false;
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continue;
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}
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//the first line after an empty line is the name of the parsed file
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if (haveFileName==false)
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{
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haveFileName=true;
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int newer=0;
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cmFileTimeComparison comp;
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bool res=comp.FileTimeCompare(this->CacheFileName.c_str(),
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line.c_str(), &newer);
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if ((res==true) && (newer==1)) //cache is newer than the parsed file
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{
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cacheEntry=new cmIncludeLines;
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this->FileCache[line]=cacheEntry;
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}
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// file doesn't exist, check that the regular expressions
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// haven't changed
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else if (res==false)
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{
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if (line.find(INCLUDE_REGEX_LINE_MARKER) == 0)
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{
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if (line != this->IncludeRegexLineString)
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{
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return;
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}
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}
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else if (line.find(INCLUDE_REGEX_SCAN_MARKER) == 0)
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{
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if (line != this->IncludeRegexScanString)
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{
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return;
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}
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}
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else if (line.find(INCLUDE_REGEX_COMPLAIN_MARKER) == 0)
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{
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if (line != this->IncludeRegexComplainString)
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{
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return;
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}
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}
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}
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}
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else if (cacheEntry!=0)
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{
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UnscannedEntry entry;
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entry.FileName = line;
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if (cmSystemTools::GetLineFromStream(fin, line))
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{
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if (line!="-")
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{
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entry.QuotedLocation=line;
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}
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cacheEntry->UnscannedEntries.push_back(entry);
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}
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}
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}
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}
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//----------------------------------------------------------------------------
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void cmDependsC::WriteCacheFile() const
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{
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if(this->CacheFileName.size() == 0)
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{
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return;
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}
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std::ofstream cacheOut(this->CacheFileName.c_str());
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if(!cacheOut)
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{
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return;
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}
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cacheOut << this->IncludeRegexLineString << "\n\n";
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cacheOut << this->IncludeRegexScanString << "\n\n";
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cacheOut << this->IncludeRegexComplainString << "\n\n";
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for (std::map<cmStdString, cmIncludeLines*>::const_iterator fileIt=
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this->FileCache.begin();
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fileIt!=this->FileCache.end(); ++fileIt)
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{
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if (fileIt->second->Used)
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{
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cacheOut<<fileIt->first.c_str()<<std::endl;
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for (std::vector<UnscannedEntry>::const_iterator
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incIt=fileIt->second->UnscannedEntries.begin();
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incIt!=fileIt->second->UnscannedEntries.end(); ++incIt)
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{
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cacheOut<<incIt->FileName.c_str()<<std::endl;
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if (incIt->QuotedLocation.empty())
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{
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cacheOut<<"-"<<std::endl;
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}
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else
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{
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cacheOut<<incIt->QuotedLocation.c_str()<<std::endl;
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}
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}
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cacheOut<<std::endl;
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}
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}
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}
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//----------------------------------------------------------------------------
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void cmDependsC::Scan(std::istream& is, const char* directory,
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const cmStdString& fullName)
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{
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cmIncludeLines* newCacheEntry=new cmIncludeLines;
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newCacheEntry->Used=true;
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this->FileCache[fullName]=newCacheEntry;
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// Read one line at a time.
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std::string line;
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while(cmSystemTools::GetLineFromStream(is, line))
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{
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// Match include directives.
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if(this->IncludeRegexLine.find(line.c_str()))
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{
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// Get the file being included.
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UnscannedEntry entry;
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entry.FileName = this->IncludeRegexLine.match(2);
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if(this->IncludeRegexLine.match(3) == "\"" &&
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!cmSystemTools::FileIsFullPath(entry.FileName.c_str()))
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{
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// This was a double-quoted include with a relative path. We
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// must check for the file in the directory containing the
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// file we are scanning.
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entry.QuotedLocation = directory;
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entry.QuotedLocation += "/";
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entry.QuotedLocation += entry.FileName;
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}
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// Queue the file if it has not yet been encountered and it
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// matches the regular expression for recursive scanning. Note
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// that this check does not account for the possibility of two
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// headers with the same name in different directories when one
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// is included by double-quotes and the other by angle brackets.
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// This kind of problem will be fixed when a more
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// preprocessor-like implementation of this scanner is created.
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if (this->IncludeRegexScan.find(entry.FileName.c_str()))
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{
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newCacheEntry->UnscannedEntries.push_back(entry);
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if(this->Encountered.find(entry.FileName) == this->Encountered.end())
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{
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this->Encountered.insert(entry.FileName);
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this->Unscanned.push(entry);
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}
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}
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}
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}
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}
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