cmGlobalGenerator: Optimize FindMakefile method with an index
This method is used by directory get/set APIs. With the new `SUBDIRECTORIES` and `BUILDSYSTEM_TARGETS` methods projects may now make heavy use of these APIs to traverse their directory structure and process targets. Make this faster by indexing the directory lookups.
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@ -1059,6 +1059,7 @@ void cmGlobalGenerator::Configure()
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cmMakefile* dirMf = new cmMakefile(this, snapshot);
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this->Makefiles.push_back(dirMf);
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this->IndexMakefile(dirMf);
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this->BinaryDirectories.insert(
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this->CMakeInstance->GetHomeOutputDirectory());
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@ -1528,6 +1529,7 @@ void cmGlobalGenerator::ClearGeneratorMembers()
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this->TargetDependencies.clear();
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this->TargetSearchIndex.clear();
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this->GeneratorTargetSearchIndex.clear();
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this->MakefileSearchIndex.clear();
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this->ProjectMap.clear();
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this->RuleHashes.clear();
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this->DirectoryContentMap.clear();
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@ -1805,6 +1807,7 @@ std::string cmGlobalGenerator::GenerateCMakeBuildCommand(
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void cmGlobalGenerator::AddMakefile(cmMakefile* mf)
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{
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this->Makefiles.push_back(mf);
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this->IndexMakefile(mf);
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// update progress
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// estimate how many lg there will be
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@ -1962,12 +1965,9 @@ void cmGlobalGenerator::FillProjectMap()
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cmMakefile* cmGlobalGenerator::FindMakefile(const std::string& start_dir) const
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{
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for (std::vector<cmMakefile*>::const_iterator it = this->Makefiles.begin();
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it != this->Makefiles.end(); ++it) {
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std::string sd = (*it)->GetCurrentSourceDirectory();
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if (sd == start_dir) {
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return *it;
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}
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MakefileMap::const_iterator i = this->MakefileSearchIndex.find(start_dir);
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if (i != this->MakefileSearchIndex.end()) {
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return i->second;
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}
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return CM_NULLPTR;
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}
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@ -2012,6 +2012,17 @@ void cmGlobalGenerator::IndexGeneratorTarget(cmGeneratorTarget* gt)
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}
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}
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void cmGlobalGenerator::IndexMakefile(cmMakefile* mf)
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{
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// FIXME: add_subdirectory supports multiple build directories
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// sharing the same source directory. We currently index only the
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// first one, because that is what FindMakefile has always returned.
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// All of its callers will need to be modified to support looking
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// up directories by build directory path.
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this->MakefileSearchIndex.insert(
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MakefileMap::value_type(mf->GetCurrentSourceDirectory(), mf));
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}
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cmTarget* cmGlobalGenerator::FindTargetImpl(std::string const& name) const
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{
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TargetMap::const_iterator i = this->TargetSearchIndex.find(name);
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@ -462,13 +462,16 @@ private:
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typedef std::unordered_map<std::string, cmTarget*> TargetMap;
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typedef std::unordered_map<std::string, cmGeneratorTarget*>
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GeneratorTargetMap;
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typedef std::unordered_map<std::string, cmMakefile*> MakefileMap;
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#else
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typedef cmsys::hash_map<std::string, cmTarget*> TargetMap;
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typedef cmsys::hash_map<std::string, cmGeneratorTarget*> GeneratorTargetMap;
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typedef cmsys::hash_map<std::string, cmMakefile*> MakefileMap;
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#endif
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#else
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typedef std::map<std::string, cmTarget*> TargetMap;
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typedef std::map<std::string, cmGeneratorTarget*> GeneratorTargetMap;
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typedef std::map<std::string, cmMakefile*> MakefileMap;
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#endif
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// Map efficiently from target name to cmTarget instance.
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// Do not use this structure for looping over all targets.
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@ -476,6 +479,11 @@ private:
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TargetMap TargetSearchIndex;
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GeneratorTargetMap GeneratorTargetSearchIndex;
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// Map efficiently from source directory path to cmMakefile instance.
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// Do not use this structure for looping over all directories.
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// It may not contain all of them (see note in IndexMakefile method).
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MakefileMap MakefileSearchIndex;
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cmMakefile* TryCompileOuterMakefile;
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// If you add a new map here, make sure it is copied
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// in EnableLanguagesFromGenerator
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@ -528,6 +536,8 @@ private:
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void ClearGeneratorMembers();
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void IndexMakefile(cmMakefile* mf);
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virtual const char* GetBuildIgnoreErrorsFlag() const { return CM_NULLPTR; }
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// Cache directory content and target files to be built.
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