39383ef8cb
Now only the dependencies for the file where the dependencies actually may have changed are rescanned, before that this was done for all source files even if only one source file had changed. This reduces e.g. on my machine the time for scanning the dependencies of kdelibs/khtml/ when only one file (khtml_global.cpp) has changed from around 7.5 seconds to 1.2 seconds. The tests succeed, it does what I expected it to do on kdelibs, and Brad also reviewed the patch, so I think it should be ok. Alex
277 lines
8.5 KiB
C++
277 lines
8.5 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 "cmDepends.h"
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#include "cmLocalGenerator.h"
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#include "cmMakefile.h"
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#include "cmGeneratedFileStream.h"
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#include "cmSystemTools.h"
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#include "cmFileTimeComparison.h"
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#include <string.h>
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//----------------------------------------------------------------------------
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cmDepends::cmDepends(cmLocalGenerator* lg, const char* targetDir):
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CompileDirectory(),
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LocalGenerator(lg),
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Verbose(false),
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FileComparison(0),
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TargetDirectory(targetDir),
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MaxPath(cmSystemTools::GetMaximumFilePathLength()),
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Dependee(new char[MaxPath]),
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Depender(new char[MaxPath])
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{
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}
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//----------------------------------------------------------------------------
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cmDepends::~cmDepends()
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{
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delete [] this->Dependee;
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delete [] this->Depender;
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}
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//----------------------------------------------------------------------------
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bool cmDepends::Write(std::ostream &makeDepends,
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std::ostream &internalDepends)
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{
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// Lookup the set of sources to scan.
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std::string srcLang = "CMAKE_DEPENDS_CHECK_";
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srcLang += this->Language;
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cmMakefile* mf = this->LocalGenerator->GetMakefile();
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const char* srcStr = mf->GetSafeDefinition(srcLang.c_str());
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std::vector<std::string> pairs;
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cmSystemTools::ExpandListArgument(srcStr, pairs);
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for(std::vector<std::string>::iterator si = pairs.begin();
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si != pairs.end();)
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{
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// Get the source and object file.
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std::string const& src = *si++;
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if(si == pairs.end()) { break; }
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std::string obj = *si++;
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// Make sure the object file is relative to the top of the build tree.
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obj = this->LocalGenerator->Convert(obj.c_str(),
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cmLocalGenerator::HOME_OUTPUT,
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cmLocalGenerator::MAKEFILE);
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// Write the dependencies for this pair.
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if(!this->WriteDependencies(src.c_str(), obj.c_str(),
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makeDepends, internalDepends))
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{
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return false;
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}
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}
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return this->Finalize(makeDepends, internalDepends);
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}
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//----------------------------------------------------------------------------
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bool cmDepends::Finalize(std::ostream&,
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std::ostream&)
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{
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return true;
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}
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//----------------------------------------------------------------------------
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bool cmDepends::Check(const char *makeFile, const char *internalFile,
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std::map<std::string, DependencyVector>& validDeps)
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{
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// Dependency checks must be done in proper working directory.
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std::string oldcwd = ".";
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if(this->CompileDirectory != ".")
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{
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// Get the CWD but do not call CollapseFullPath because
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// we only need it to cd back, and the form does not matter
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oldcwd = cmSystemTools::GetCurrentWorkingDirectory(false);
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cmSystemTools::ChangeDirectory(this->CompileDirectory.c_str());
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}
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// Check whether dependencies must be regenerated.
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bool okay = true;
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std::ifstream fin(internalFile);
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if(!(fin && this->CheckDependencies(fin, validDeps)))
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{
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// Clear all dependencies so they will be regenerated.
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this->Clear(makeFile);
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cmSystemTools::RemoveFile(internalFile);
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okay = false;
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}
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// Restore working directory.
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if(oldcwd != ".")
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{
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cmSystemTools::ChangeDirectory(oldcwd.c_str());
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}
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return okay;
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}
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//----------------------------------------------------------------------------
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void cmDepends::Clear(const char *file)
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{
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// Print verbose output.
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if(this->Verbose)
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{
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cmOStringStream msg;
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msg << "Clearing dependencies in \"" << file << "\"." << std::endl;
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cmSystemTools::Stdout(msg.str().c_str());
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}
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// Write an empty dependency file.
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cmGeneratedFileStream depFileStream(file);
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depFileStream
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<< "# Empty dependencies file\n"
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<< "# This may be replaced when dependencies are built." << std::endl;
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}
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//----------------------------------------------------------------------------
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bool cmDepends::WriteDependencies(const char*, const char*,
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std::ostream&, std::ostream&)
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{
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// This should be implemented by the subclass.
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return false;
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}
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//----------------------------------------------------------------------------
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bool cmDepends::CheckDependencies(std::istream& internalDepends,
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std::map<std::string, DependencyVector>& validDeps)
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{
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// Parse dependencies from the stream. If any dependee is missing
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// or newer than the depender then dependencies should be
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// regenerated.
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bool okay = true;
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bool dependerExists = false;
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DependencyVector* currentDependencies = 0;
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while(internalDepends.getline(this->Dependee, this->MaxPath))
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{
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if ( this->Dependee[0] == 0 || this->Dependee[0] == '#' ||
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this->Dependee[0] == '\r' )
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{
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continue;
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}
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size_t len = internalDepends.gcount()-1;
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if ( this->Dependee[len-1] == '\r' )
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{
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len --;
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this->Dependee[len] = 0;
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}
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if ( this->Dependee[0] != ' ' )
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{
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memcpy(this->Depender, this->Dependee, len+1);
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// Calling FileExists() for the depender here saves in many cases 50%
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// of the calls to FileExists() further down in the loop. E.g. for
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// kdelibs/khtml this reduces the number of calls from 184k down to 92k,
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// or the time for cmake -E cmake_depends from 0.3 s down to 0.21 s.
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dependerExists = cmSystemTools::FileExists(this->Depender);
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DependencyVector tmp;
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validDeps[this->Depender] = tmp;
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currentDependencies = &validDeps[this->Depender];
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continue;
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}
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/*
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// Parse the dependency line.
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if(!this->ParseDependency(line.c_str()))
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{
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continue;
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}
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*/
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// Dependencies must be regenerated if the dependee does not exist
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// or if the depender exists and is older than the dependee.
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bool regenerate = false;
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const char* dependee = this->Dependee+1;
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const char* depender = this->Depender;
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if (currentDependencies != 0)
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{
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currentDependencies->push_back(dependee);
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}
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if(!cmSystemTools::FileExists(dependee))
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{
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// The dependee does not exist.
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regenerate = true;
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// Print verbose output.
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if(this->Verbose)
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{
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cmOStringStream msg;
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msg << "Dependee \"" << dependee
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<< "\" does not exist for depender \""
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<< depender << "\"." << std::endl;
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cmSystemTools::Stdout(msg.str().c_str());
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}
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}
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else if(dependerExists)
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{
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// The dependee and depender both exist. Compare file times.
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int result = 0;
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if((!this->FileComparison->FileTimeCompare(depender, dependee,
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&result) || result < 0))
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{
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// The depender is older than the dependee.
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regenerate = true;
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// Print verbose output.
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if(this->Verbose)
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{
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cmOStringStream msg;
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msg << "Dependee \"" << dependee
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<< "\" is newer than depender \""
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<< depender << "\"." << std::endl;
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cmSystemTools::Stdout(msg.str().c_str());
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}
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}
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}
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if(regenerate)
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{
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// Dependencies must be regenerated.
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okay = false;
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// Remove the information of this depender from the map, it needs
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// to be rescanned
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if (currentDependencies != 0)
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{
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validDeps.erase(this->Depender);
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currentDependencies = 0;
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}
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// Remove the depender to be sure it is rebuilt.
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if (dependerExists)
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{
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cmSystemTools::RemoveFile(depender);
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dependerExists = false;
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}
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}
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}
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return okay;
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}
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//----------------------------------------------------------------------------
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void cmDepends::SetIncludePathFromLanguage(const char* lang)
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{
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std::string includePathVar = "CMAKE_";
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includePathVar += lang;
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includePathVar += "_INCLUDE_PATH";
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cmMakefile* mf = this->LocalGenerator->GetMakefile();
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if(const char* includePath = mf->GetDefinition(includePathVar.c_str()))
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{
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cmSystemTools::ExpandListArgument(includePath, this->IncludePath);
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}
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}
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