CMake/Source/cmDependsC.cxx

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/*=========================================================================
Program: CMake - Cross-Platform Makefile Generator
Module: $RCSfile$
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#include "cmDependsC.h"
#include "cmSystemTools.h"
#include "cmFileTimeComparison.h"
#include <ctype.h> // isspace
//----------------------------------------------------------------------------
cmDependsC::cmDependsC():
m_IncludePath(0), m_GeneratedFiles(0)
{
}
//----------------------------------------------------------------------------
// yummy look at all those constructor arguments
cmDependsC::cmDependsC(std::vector<std::string> const& includes,
const char* scanRegex, const char* complainRegex,
std::set<cmStdString> const& generatedFiles,
const cmStdString& cacheFileName):
m_IncludePath(&includes),
m_IncludeRegexLine("^[ \t]*#[ \t]*include[ \t]*[<\"]([^\">]+)([\">])"),
m_IncludeRegexScan(scanRegex),
m_IncludeRegexComplain(complainRegex),
m_GeneratedFiles(&generatedFiles),
m_cacheFileName(cacheFileName)
{
this->ReadCacheFile();
}
//----------------------------------------------------------------------------
cmDependsC::~cmDependsC()
{
this->WriteCacheFile();
for (std::map<cmStdString, cmIncludeLines*>::iterator it=m_fileCache.begin();
it!=m_fileCache.end(); ++it)
{
delete it->second;
}
}
//----------------------------------------------------------------------------
bool cmDependsC::WriteDependencies(const char *src, const char *obj,
std::ostream& makeDepends, std::ostream& internalDepends)
{
// Make sure this is a scanning instance.
if(!src || src[0] == '\0')
{
cmSystemTools::Error("Cannot scan dependencies without a source file.");
return false;
}
if(!obj || obj[0] == '\0')
{
cmSystemTools::Error("Cannot scan dependencies without an object file.");
return false;
}
if(!m_IncludePath)
{
cmSystemTools::Error("Cannot scan dependencies without an include path.");
return false;
}
// Walk the dependency graph starting with the source file.
bool first = true;
UnscannedEntry root;
root.FileName = src;
m_Unscanned.push(root);
m_Encountered.clear();
m_Encountered.insert(src);
std::set<cmStdString> dependencies;
std::set<cmStdString> scanned;
while(!m_Unscanned.empty())
{
// Get the next file to scan.
UnscannedEntry current = m_Unscanned.front();
m_Unscanned.pop();
// If not a full path, find the file in the include path.
std::string fullName;
if(first || cmSystemTools::FileIsFullPath(current.FileName.c_str()))
{
if(this->FileExistsOrIsGenerated(current.FileName, scanned,
dependencies))
{
fullName = current.FileName;
}
}
else if(!current.QuotedLocation.empty() &&
this->FileExistsOrIsGenerated(current.QuotedLocation, scanned,
dependencies))
{
// The include statement producing this entry was a double-quote
// include and the included file is present in the directory of
// the source containing the include statement.
fullName = current.QuotedLocation;
}
else
{
for(std::vector<std::string>::const_iterator i = m_IncludePath->begin();
i != m_IncludePath->end(); ++i)
{
// Construct the name of the file as if it were in the current
// include directory. Avoid using a leading "./".
std::string temp = *i;
if(temp == ".")
{
temp = "";
}
else
{
temp += "/";
}
temp += current.FileName;
// Look for the file in this location.
if(this->FileExistsOrIsGenerated(temp, scanned, dependencies))
{
fullName = temp;
break;
}
}
}
// Complain if the file cannot be found and matches the complain
// regex.
if(fullName.empty() &&
m_IncludeRegexComplain.find(current.FileName.c_str()))
{
cmSystemTools::Error("Cannot find file \"",
current.FileName.c_str(), "\".");
return false;
}
// Scan the file if it was found and has not been scanned already.
if(!fullName.empty() && (scanned.find(fullName) == scanned.end()))
{
// Record scanned files.
scanned.insert(fullName);
// Check whether this file is already in the cache
std::map<cmStdString, cmIncludeLines*>::iterator fileIt=m_fileCache.find(fullName);
if (fileIt!=m_fileCache.end())
{
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fileIt->second->m_Used=true;
dependencies.insert(fullName);
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for (std::vector<UnscannedEntry>::const_iterator incIt=
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fileIt->second->m_UnscannedEntries.begin();
incIt!=fileIt->second->m_UnscannedEntries.end(); ++incIt)
{
if (m_Encountered.find(incIt->FileName) == m_Encountered.end())
{
m_Encountered.insert(incIt->FileName);
m_Unscanned.push(*incIt);
}
}
}
else
{
// Try to scan the file. Just leave it out if we cannot find
// it.
std::ifstream fin(fullName.c_str());
if(fin)
{
// Add this file as a dependency.
dependencies.insert(fullName);
// Scan this file for new dependencies. Pass the directory
// containing the file to handle double-quote includes.
std::string dir = cmSystemTools::GetFilenamePath(fullName);
this->Scan(fin, dir.c_str(), fullName);
}
}
}
first = false;
}
// Write the dependencies to the output stream.
internalDepends << obj << std::endl;
for(std::set<cmStdString>::iterator i=dependencies.begin();
i != dependencies.end(); ++i)
{
makeDepends << obj << ": "
<< cmSystemTools::ConvertToOutputPath(i->c_str()).c_str()
<< std::endl;
internalDepends << " " << i->c_str() << std::endl;
}
makeDepends << std::endl;
return true;
}
//----------------------------------------------------------------------------
void cmDependsC::ReadCacheFile()
{
if(m_cacheFileName.size() == 0)
{
return;
}
std::ifstream fin(m_cacheFileName.c_str());
if(!fin)
{
return;
}
std::string line;
cmIncludeLines* cacheEntry=0;
bool haveFileName=false;
while(cmSystemTools::GetLineFromStream(fin, line))
{
if (line.empty())
{
cacheEntry=0;
haveFileName=false;
continue;
}
//the first line after an empty line is the name of the parsed file
if (haveFileName==false)
{
haveFileName=true;
int newer=0;
cmFileTimeComparison comp;
bool res=comp.FileTimeCompare(m_cacheFileName.c_str(), line.c_str(), &newer);
if ((res==true) && (newer==1)) //cache is newer than the parsed file
{
cacheEntry=new cmIncludeLines;
m_fileCache[line]=cacheEntry;
}
}
else if (cacheEntry!=0)
{
UnscannedEntry entry;
entry.FileName = line;
if (cmSystemTools::GetLineFromStream(fin, line))
{
if (line!="-")
{
entry.QuotedLocation=line;
}
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cacheEntry->m_UnscannedEntries.push_back(entry);
}
}
}
}
//----------------------------------------------------------------------------
void cmDependsC::WriteCacheFile() const
{
if(m_cacheFileName.size() == 0)
{
return;
}
std::ofstream cacheOut(m_cacheFileName.c_str());
if(!cacheOut)
{
return;
}
for (std::map<cmStdString, cmIncludeLines*>::const_iterator fileIt=m_fileCache.begin();
fileIt!=m_fileCache.end(); ++fileIt)
{
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if (fileIt->second->m_Used)
{
cacheOut<<fileIt->first.c_str()<<std::endl;
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for (std::vector<UnscannedEntry>::const_iterator
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incIt=fileIt->second->m_UnscannedEntries.begin();
incIt!=fileIt->second->m_UnscannedEntries.end(); ++incIt)
{
cacheOut<<incIt->FileName.c_str()<<std::endl;
if (incIt->QuotedLocation.empty())
{
cacheOut<<"-"<<std::endl;
}
else
{
cacheOut<<incIt->QuotedLocation.c_str()<<std::endl;
}
}
cacheOut<<std::endl;
}
}
}
//----------------------------------------------------------------------------
void cmDependsC::Scan(std::istream& is, const char* directory, const cmStdString& fullName)
{
cmIncludeLines* newCacheEntry=new cmIncludeLines;
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newCacheEntry->m_Used=true;
m_fileCache[fullName]=newCacheEntry;
// Read one line at a time.
std::string line;
while(cmSystemTools::GetLineFromStream(is, line))
{
// Match include directives.
if(m_IncludeRegexLine.find(line.c_str()))
{
// Get the file being included.
UnscannedEntry entry;
entry.FileName = m_IncludeRegexLine.match(1);
if(m_IncludeRegexLine.match(2) == "\"")
{
// This was a double-quoted include. We must check for the
// file in the directory containing the file we are scanning.
entry.QuotedLocation = directory;
entry.QuotedLocation += "/";
entry.QuotedLocation += entry.FileName;
}
// Queue the file if it has not yet been encountered and it
// matches the regular expression for recursive scanning. Note
// that this check does not account for the possibility of two
// headers with the same name in different directories when one
// is included by double-quotes and the other by angle brackets.
// This kind of problem will be fixed when a more
// preprocessor-like implementation of this scanner is created.
if (m_IncludeRegexScan.find(entry.FileName.c_str()))
{
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newCacheEntry->m_UnscannedEntries.push_back(entry);
if(m_Encountered.find(entry.FileName) == m_Encountered.end())
{
m_Encountered.insert(entry.FileName);
m_Unscanned.push(entry);
}
}
}
}
}
//----------------------------------------------------------------------------
bool cmDependsC::FileExistsOrIsGenerated(const std::string& fname,
std::set<cmStdString>& scanned,
std::set<cmStdString>& dependencies)
{
// Check first for a generated file.
if(m_GeneratedFiles &&
std::set<cmStdString>::const_iterator(m_GeneratedFiles->find(fname)) !=
m_GeneratedFiles->end())
{
// If the file does not really exist yet pretend it has already
// been scanned. When it exists later then dependencies will be
// rescanned.
if(!cmSystemTools::FileExists(fname.c_str()))
{
scanned.insert(fname);
dependencies.insert(fname);
}
return true;
}
else
{
return cmSystemTools::FileExists(fname.c_str());
}
}