Autogen: Refactor AUTOMOC and AUTOUIC and add source file parse data caching

New features
------------

CMake's `AUTOMOC` and `AUTOUIC` now cache information extracted when parsing
source files in `CMakeFiles/<ORIGIN>_autogen.dir/ParseCache.txt`.
This leads to faster `<ORIGIN>_autogen` target rebuilds, because source files
will be parsed again only if they're newer than the `ParseCache.txt` file.
The parse cache will be recomputed if it is older than the CMake executable.

`AUTOMOC` and `AUTOUIC` now check if `moc` or `uic` output files are older
than the `moc` or `uic` executable.  If an output file is older than the
compiler, it will be regenerated.  Therefore if a new `moc` or `uic` version
is installed, all output files will be regenerated.

`AUTOMOC` and `AUTOUIC` error and warning messages are more detailed.

Internal changes
----------------

`moc` and `uic` output file names are not computed in the `_autogen`
target anymore but in `cmQtAutoGenInitializer`.  This makes the available at
the configuration stage for improved dependency computations (to be done).

In `AutogenInfo.cmake`, equally sized lists for "source file names",
"source file flags" and "compiler output file names" are passed to the
`_autogen` target.  This replaces the separate file lists for
`AUTOMOC` and `AUTOUIC`.

Files times are read from the file system only once by using `cmFileTime`
instances instead of `cmQtAutoGenerator::FileSystem::FileIsOlderThan` calls.

All calls to not thread safe file system functions are moved to non concurrent
fence jobs (see `cmWorkerPool::JobT::IsFence()`).  This renders the
`cmQtAutoGenerator::FileSystem` wrapper class obsolete and it is removed.

Instead of composing a single large settings string that is fed to the
`cmCryptoHash`, now all setting sub strings are fed one by one to the
`cmCryptoHash` and the finalized result is stored.

The `std::mutex` in `cmQtAutoGenerator::Logger` is tagged `mutable` and most
`cmQtAutoGenerator::Logger` methods become `const`.

Outlook
-------

This patch provides the framework required to

- extract dependencies from `.ui` files in `AUTOUIC`.
  These will help to address issue
  #15420 "AUTOUIC: Track uic external inputs".

- generate adaptive `make` and `ninja` files in the `_autogen` target.
  These will help to address issue
  #16776 "AUTOUIC: Ninja needs two passes to correctly build Qt project".

- generate (possibly empty) `moc` and `uic` files for all headers instead of a
  `mocs_compilation.cpp` file.
  This will help to address issue
  #17277 "AUTOMOC: Provide a option to allow AUTOMOC to compile individual "
         "moc_x.cxx instead of including all in mocs_compilation.cxx"

9 files changed, 2067 insertions, 1598 deletions

diff --git a/Source/cmQtAutoGen.cxx b/Source/cmQtAutoGen.cxx
index 9918c35..a245b54 100644
--- a/Source/cmQtAutoGen.cxx
+++ b/Source/cmQtAutoGen.cxx
@@ -194,11 +194,11 @@ std::string cmQtAutoGen::QuotedCommand(std::vector<std::string> const& command)
 
 std::string cmQtAutoGen::SubDirPrefix(std::string const& filename)
 {
-  std::string res(cmSystemTools::GetFilenamePath(filename));
-  if (!res.empty()) {
-    res += '/';
+  std::string::size_type slash_pos = filename.rfind('/');
+  if (slash_pos == std::string::npos) {
+    return std::string();
   }
-  return res;
+  return filename.substr(0, slash_pos + 1);
 }
 
 std::string cmQtAutoGen::AppendFilenameSuffix(std::string const& filename,
diff --git a/Source/cmQtAutoGenInitializer.cxx b/Source/cmQtAutoGenInitializer.cxx
index be96f1a..38f39fb 100644
--- a/Source/cmQtAutoGenInitializer.cxx
+++ b/Source/cmQtAutoGenInitializer.cxx
@@ -34,6 +34,7 @@
 #include <map>
 #include <set>
 #include <string>
+#include <unordered_set>
 #include <utility>
 #include <vector>
 
@@ -77,7 +78,8 @@ static std::string FileProjectRelativePath(cmMakefile* makefile,
   return res;
 }
 
-/* @brief Tests if targetDepend is a STATIC_LIBRARY and if any of its
+/**
+ * Tests if targetDepend is a STATIC_LIBRARY and if any of its
  * recursive STATIC_LIBRARY dependencies depends on targetOrigin
  * (STATIC_LIBRARY cycle).
  */
@@ -384,6 +386,10 @@ bool cmQtAutoGenInitializer::InitCustomTargets()
       } else {
         AddCleanFile(makefile, this->AutogenTarget.SettingsFile);
       }
+
+      this->AutogenTarget.ParseCacheFile = this->Dir.Info;
+      this->AutogenTarget.ParseCacheFile += "/ParseCache.txt";
+      AddCleanFile(makefile, this->AutogenTarget.ParseCacheFile);
     }
 
     // Autogen target: Compute user defined dependencies
@@ -1255,53 +1261,107 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
     ofs.Write("AM_INCLUDE_DIR", this->Dir.Include);
     ofs.WriteConfig("AM_INCLUDE_DIR", this->Dir.ConfigInclude);
 
-    // Use sorted sets
-    std::set<std::string> headers;
-    std::set<std::string> sources;
-    std::set<std::string> moc_headers;
-    std::set<std::string> moc_sources;
+    std::vector<std::string> headers;
+    std::vector<std::string> headersFlags;
+    std::vector<std::string> headersBuildPaths;
+    std::vector<std::string> sources;
+    std::vector<std::string> sourcesFlags;
     std::set<std::string> moc_skip;
-    std::set<std::string> uic_headers;
-    std::set<std::string> uic_sources;
     std::set<std::string> uic_skip;
+
     // Filter headers
-    for (auto const& pair : this->AutogenTarget.Headers) {
-      MUFile const& muf = *pair.second;
-      if (muf.Generated && !this->CMP0071Accept) {
-        continue;
-      }
-      if (muf.SkipMoc) {
-        moc_skip.insert(muf.RealPath);
+    {
+      auto headerCount = this->AutogenTarget.Headers.size();
+      headers.reserve(headerCount);
+      headersFlags.reserve(headerCount);
+
+      std::vector<MUFile const*> sortedHeaders;
+      {
+        sortedHeaders.reserve(headerCount);
+        for (auto const& pair : this->AutogenTarget.Headers) {
+          sortedHeaders.emplace_back(pair.second.get());
+        }
+        std::sort(sortedHeaders.begin(), sortedHeaders.end(),
+                  [](MUFile const* a, MUFile const* b) {
+                    return (a->RealPath < b->RealPath);
+                  });
       }
-      if (muf.SkipUic) {
-        uic_skip.insert(muf.RealPath);
+
+      for (MUFile const* const muf : sortedHeaders) {
+        if (muf->Generated && !this->CMP0071Accept) {
+          continue;
+        }
+        if (muf->SkipMoc) {
+          moc_skip.insert(muf->RealPath);
+        }
+        if (muf->SkipUic) {
+          uic_skip.insert(muf->RealPath);
+        }
+        if (muf->MocIt || muf->UicIt) {
+          headers.emplace_back(muf->RealPath);
+          std::string flags;
+          flags += muf->MocIt ? 'M' : 'm';
+          flags += muf->UicIt ? 'U' : 'u';
+          headersFlags.emplace_back(std::move(flags));
+        }
       }
-      if (muf.MocIt && muf.UicIt) {
-        headers.insert(muf.RealPath);
-      } else if (muf.MocIt) {
-        moc_headers.insert(muf.RealPath);
-      } else if (muf.UicIt) {
-        uic_headers.insert(muf.RealPath);
+    }
+    // Header build paths
+    {
+      cmFilePathChecksum const fpathCheckSum(makefile);
+      std::unordered_set<std::string> emitted;
+      for (std::string const& hdr : headers) {
+        std::string basePath = fpathCheckSum.getPart(hdr);
+        basePath += "/moc_";
+        basePath += cmSystemTools::GetFilenameWithoutLastExtension(hdr);
+        for (unsigned int ii = 1; ii != 1024; ++ii) {
+          std::string path = basePath;
+          if (ii > 1) {
+            path += '_';
+            path += std::to_string(ii);
+          }
+          path += ".cpp";
+          if (emitted.emplace(path).second) {
+            headersBuildPaths.emplace_back(std::move(path));
+            break;
+          }
+        }
       }
     }
+
     // Filter sources
-    for (auto const& pair : this->AutogenTarget.Sources) {
-      MUFile const& muf = *pair.second;
-      if (muf.Generated && !this->CMP0071Accept) {
-        continue;
-      }
-      if (muf.SkipMoc) {
-        moc_skip.insert(muf.RealPath);
-      }
-      if (muf.SkipUic) {
-        uic_skip.insert(muf.RealPath);
+    {
+      auto sourcesCount = this->AutogenTarget.Sources.size();
+      sources.reserve(sourcesCount);
+      sourcesFlags.reserve(sourcesCount);
+
+      std::vector<MUFile const*> sorted;
+      sorted.reserve(sourcesCount);
+      for (auto const& pair : this->AutogenTarget.Sources) {
+        sorted.emplace_back(pair.second.get());
       }
-      if (muf.MocIt && muf.UicIt) {
-        sources.insert(muf.RealPath);
-      } else if (muf.MocIt) {
-        moc_sources.insert(muf.RealPath);
-      } else if (muf.UicIt) {
-        uic_sources.insert(muf.RealPath);
+      std::sort(sorted.begin(), sorted.end(),
+                [](MUFile const* a, MUFile const* b) {
+                  return (a->RealPath < b->RealPath);
+                });
+
+      for (MUFile const* const muf : sorted) {
+        if (muf->Generated && !this->CMP0071Accept) {
+          continue;
+        }
+        if (muf->SkipMoc) {
+          moc_skip.insert(muf->RealPath);
+        }
+        if (muf->SkipUic) {
+          uic_skip.insert(muf->RealPath);
+        }
+        if (muf->MocIt || muf->UicIt) {
+          sources.emplace_back(muf->RealPath);
+          std::string flags;
+          flags += muf->MocIt ? 'M' : 'm';
+          flags += muf->UicIt ? 'U' : 'u';
+          sourcesFlags.emplace_back(std::move(flags));
+        }
       }
     }
 
@@ -1311,17 +1371,20 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
     ofs.Write("AM_QT_UIC_EXECUTABLE", this->Uic.Executable);
 
     ofs.Write("# Files\n");
+    ofs.Write("AM_CMAKE_EXECUTABLE", cmSystemTools::GetCMakeCommand());
     ofs.Write("AM_SETTINGS_FILE", this->AutogenTarget.SettingsFile);
     ofs.WriteConfig("AM_SETTINGS_FILE",
                     this->AutogenTarget.ConfigSettingsFile);
+    ofs.Write("AM_PARSE_CACHE_FILE", this->AutogenTarget.ParseCacheFile);
     ofs.WriteStrings("AM_HEADERS", headers);
+    ofs.WriteStrings("AM_HEADERS_FLAGS", headersFlags);
+    ofs.WriteStrings("AM_HEADERS_BUILD_PATHS", headersBuildPaths);
     ofs.WriteStrings("AM_SOURCES", sources);
+    ofs.WriteStrings("AM_SOURCES_FLAGS", sourcesFlags);
 
     // Write moc settings
     if (this->Moc.Enabled) {
       ofs.Write("# MOC settings\n");
-      ofs.WriteStrings("AM_MOC_HEADERS", moc_headers);
-      ofs.WriteStrings("AM_MOC_SOURCES", moc_sources);
       ofs.WriteStrings("AM_MOC_SKIP", moc_skip);
       ofs.WriteStrings("AM_MOC_DEFINITIONS", this->Moc.Defines);
       ofs.WriteConfigStrings("AM_MOC_DEFINITIONS", this->Moc.ConfigDefines);
@@ -1343,8 +1406,6 @@ bool cmQtAutoGenInitializer::SetupWriteAutogenInfo()
       uic_skip.insert(this->Uic.SkipUi.begin(), this->Uic.SkipUi.end());
 
       ofs.Write("# UIC settings\n");
-      ofs.WriteStrings("AM_UIC_HEADERS", uic_headers);
-      ofs.WriteStrings("AM_UIC_SOURCES", uic_sources);
       ofs.WriteStrings("AM_UIC_SKIP", uic_skip);
       ofs.WriteStrings("AM_UIC_TARGET_OPTIONS", this->Uic.Options);
       ofs.WriteConfigStrings("AM_UIC_TARGET_OPTIONS", this->Uic.ConfigOptions);
diff --git a/Source/cmQtAutoGenInitializer.h b/Source/cmQtAutoGenInitializer.h
index 7ff33c3..153f56d 100644
--- a/Source/cmQtAutoGenInitializer.h
+++ b/Source/cmQtAutoGenInitializer.h
@@ -183,6 +183,7 @@ private:
     // Configuration files
     std::string InfoFile;
     std::string SettingsFile;
+    std::string ParseCacheFile;
     std::map<std::string, std::string> ConfigSettingsFile;
     // Dependencies
     bool DependOrigin = false;
diff --git a/Source/cmQtAutoGenerator.cxx b/Source/cmQtAutoGenerator.cxx
index 6fbea82..f7e377d 100644
--- a/Source/cmQtAutoGenerator.cxx
+++ b/Source/cmQtAutoGenerator.cxx
@@ -66,7 +66,8 @@ std::string cmQtAutoGenerator::Logger::HeadLine(std::string const& title)
   return head;
 }
 
-void cmQtAutoGenerator::Logger::Info(GenT genType, std::string const& message)
+void cmQtAutoGenerator::Logger::Info(GenT genType,
+                                     std::string const& message) const
 {
   std::string msg = GeneratorName(genType);
   msg += ": ";
@@ -81,7 +82,7 @@ void cmQtAutoGenerator::Logger::Info(GenT genType, std::string const& message)
 }
 
 void cmQtAutoGenerator::Logger::Warning(GenT genType,
-                                        std::string const& message)
+                                        std::string const& message) const
 {
   std::string msg;
   if (message.find('\n') == std::string::npos) {
@@ -106,7 +107,7 @@ void cmQtAutoGenerator::Logger::Warning(GenT genType,
 
 void cmQtAutoGenerator::Logger::WarningFile(GenT genType,
                                             std::string const& filename,
-                                            std::string const& message)
+                                            std::string const& message) const
 {
   std::string msg = "  ";
   msg += Quoted(filename);
@@ -116,7 +117,8 @@ void cmQtAutoGenerator::Logger::WarningFile(GenT genType,
   Warning(genType, msg);
 }
 
-void cmQtAutoGenerator::Logger::Error(GenT genType, std::string const& message)
+void cmQtAutoGenerator::Logger::Error(GenT genType,
+                                      std::string const& message) const
 {
   std::string msg;
   msg += HeadLine(GeneratorName(genType) + " error");
@@ -134,7 +136,7 @@ void cmQtAutoGenerator::Logger::Error(GenT genType, std::string const& message)
 
 void cmQtAutoGenerator::Logger::ErrorFile(GenT genType,
                                           std::string const& filename,
-                                          std::string const& message)
+                                          std::string const& message) const
 {
   std::string emsg = "  ";
   emsg += Quoted(filename);
@@ -146,7 +148,7 @@ void cmQtAutoGenerator::Logger::ErrorFile(GenT genType,
 
 void cmQtAutoGenerator::Logger::ErrorCommand(
   GenT genType, std::string const& message,
-  std::vector<std::string> const& command, std::string const& output)
+  std::vector<std::string> const& command, std::string const& output) const
 {
   std::string msg;
   msg.push_back('\n');
@@ -191,7 +193,7 @@ bool cmQtAutoGenerator::FileRead(std::string& content,
   content.clear();
   if (!cmSystemTools::FileExists(filename, true)) {
     if (error != nullptr) {
-      error->append("Not a file.");
+      *error = "Not a file.";
     }
     return false;
   }
@@ -203,7 +205,7 @@ bool cmQtAutoGenerator::FileRead(std::string& content,
   return [&ifs, length, &content, error]() -> bool {
     if (!ifs) {
       if (error != nullptr) {
-        error->append("Opening the file for reading failed.");
+        *error = "Opening the file for reading failed.";
       }
       return false;
     }
@@ -213,7 +215,7 @@ bool cmQtAutoGenerator::FileRead(std::string& content,
     if (!ifs) {
       content.clear();
       if (error != nullptr) {
-        error->append("Reading from the file failed.");
+        *error = "Reading from the file failed.";
       }
       return false;
     }
@@ -228,7 +230,7 @@ bool cmQtAutoGenerator::FileWrite(std::string const& filename,
   // Make sure the parent directory exists
   if (!cmQtAutoGenerator::MakeParentDirectory(filename)) {
     if (error != nullptr) {
-      error->assign("Could not create parent directory.");
+      *error = "Could not create parent directory.";
     }
     return false;
   }
@@ -240,14 +242,14 @@ bool cmQtAutoGenerator::FileWrite(std::string const& filename,
   return [&ofs, &content, error]() -> bool {
     if (!ofs) {
       if (error != nullptr) {
-        error->assign("Opening file for writing failed.");
+        *error = "Opening file for writing failed.";
       }
       return false;
     }
     ofs << content;
     if (!ofs.good()) {
       if (error != nullptr) {
-        error->assign("File writing failed.");
+        *error = "File writing failed.";
       }
       return false;
     }
@@ -255,176 +257,17 @@ bool cmQtAutoGenerator::FileWrite(std::string const& filename,
   }();
 }
 
-cmQtAutoGenerator::FileSystem::FileSystem() = default;
-
-cmQtAutoGenerator::FileSystem::~FileSystem() = default;
-
-std::string cmQtAutoGenerator::FileSystem::GetRealPath(
-  std::string const& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::GetRealPath(filename);
-}
-
-std::string cmQtAutoGenerator::FileSystem::CollapseFullPath(
-  std::string const& file, std::string const& dir)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::CollapseFullPath(file, dir);
-}
-
-void cmQtAutoGenerator::FileSystem::SplitPath(
-  const std::string& p, std::vector<std::string>& components,
-  bool expand_home_dir)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  cmSystemTools::SplitPath(p, components, expand_home_dir);
-}
-
-std::string cmQtAutoGenerator::FileSystem::JoinPath(
-  const std::vector<std::string>& components)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::JoinPath(components);
-}
-
-std::string cmQtAutoGenerator::FileSystem::JoinPath(
-  std::vector<std::string>::const_iterator first,
-  std::vector<std::string>::const_iterator last)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::JoinPath(first, last);
-}
-
-std::string cmQtAutoGenerator::FileSystem::GetFilenameWithoutLastExtension(
-  const std::string& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::GetFilenameWithoutLastExtension(filename);
-}
-
-std::string cmQtAutoGenerator::FileSystem::SubDirPrefix(
-  std::string const& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmQtAutoGen::SubDirPrefix(filename);
-}
-
-void cmQtAutoGenerator::FileSystem::setupFilePathChecksum(
-  std::string const& currentSrcDir, std::string const& currentBinDir,
-  std::string const& projectSrcDir, std::string const& projectBinDir)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  FilePathChecksum_.setupParentDirs(currentSrcDir, currentBinDir,
-                                    projectSrcDir, projectBinDir);
-}
-
-std::string cmQtAutoGenerator::FileSystem::GetFilePathChecksum(
-  std::string const& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return FilePathChecksum_.getPart(filename);
-}
-
-bool cmQtAutoGenerator::FileSystem::FileExists(std::string const& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::FileExists(filename);
-}
-
-bool cmQtAutoGenerator::FileSystem::FileExists(std::string const& filename,
-                                               bool isFile)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::FileExists(filename, isFile);
-}
-
-unsigned long cmQtAutoGenerator::FileSystem::FileLength(
-  std::string const& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::FileLength(filename);
-}
-
-bool cmQtAutoGenerator::FileSystem::FileIsOlderThan(
-  std::string const& buildFile, std::string const& sourceFile,
-  std::string* error)
-{
-  bool res(false);
-  int result = 0;
-  {
-    std::lock_guard<std::mutex> lock(Mutex_);
-    res = cmSystemTools::FileTimeCompare(buildFile, sourceFile, &result);
-  }
-  if (res) {
-    res = (result < 0);
-  } else {
-    if (error != nullptr) {
-      error->append(
-        "File modification time comparison failed for the files\n  ");
-      error->append(Quoted(buildFile));
-      error->append("\nand\n  ");
-      error->append(Quoted(sourceFile));
-    }
-  }
-  return res;
-}
-
-bool cmQtAutoGenerator::FileSystem::FileRead(std::string& content,
-                                             std::string const& filename,
-                                             std::string* error)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmQtAutoGenerator::FileRead(content, filename, error);
-}
-
-bool cmQtAutoGenerator::FileSystem::FileWrite(std::string const& filename,
-                                              std::string const& content,
-                                              std::string* error)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmQtAutoGenerator::FileWrite(filename, content, error);
-}
-
-bool cmQtAutoGenerator::FileSystem::FileDiffers(std::string const& filename,
-                                                std::string const& content)
+bool cmQtAutoGenerator::FileDiffers(std::string const& filename,
+                                    std::string const& content)
 {
   bool differs = true;
-  {
-    std::string oldContents;
-    if (FileRead(oldContents, filename)) {
-      differs = (oldContents != content);
-    }
+  std::string oldContents;
+  if (FileRead(oldContents, filename) && (oldContents == content)) {
+    differs = false;
   }
   return differs;
 }
 
-bool cmQtAutoGenerator::FileSystem::FileRemove(std::string const& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::RemoveFile(filename);
-}
-
-bool cmQtAutoGenerator::FileSystem::Touch(std::string const& filename,
-                                          bool create)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::Touch(filename, create);
-}
-
-bool cmQtAutoGenerator::FileSystem::MakeDirectory(std::string const& dirname)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmSystemTools::MakeDirectory(dirname);
-}
-
-bool cmQtAutoGenerator::FileSystem::MakeParentDirectory(
-  std::string const& filename)
-{
-  std::lock_guard<std::mutex> lock(Mutex_);
-  return cmQtAutoGenerator::MakeParentDirectory(filename);
-}
-
 cmQtAutoGenerator::cmQtAutoGenerator() = default;
 
 cmQtAutoGenerator::~cmQtAutoGenerator() = default;
@@ -435,6 +278,12 @@ bool cmQtAutoGenerator::Run(std::string const& infoFile,
   // Info settings
   InfoFile_ = infoFile;
   cmSystemTools::ConvertToUnixSlashes(InfoFile_);
+  if (!InfoFileTime_.Load(InfoFile_)) {
+    std::string msg = "Autogen: The info file ";
+    msg += Quoted(InfoFile_);
+    msg += " is not readable\n";
+    cmSystemTools::Stderr(msg);
+  }
   InfoDir_ = cmSystemTools::GetFilenamePath(infoFile);
   InfoConfig_ = config;
 
diff --git a/Source/cmQtAutoGenerator.h b/Source/cmQtAutoGenerator.h
index 437fa20..ff4c4c9 100644
--- a/Source/cmQtAutoGenerator.h
+++ b/Source/cmQtAutoGenerator.h
@@ -5,7 +5,7 @@
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
-#include "cmFilePathChecksum.h"
+#include "cmFileTime.h"
 #include "cmQtAutoGen.h"
 
 #include <mutex>
@@ -14,13 +14,17 @@
 
 class cmMakefile;
 
-/// @brief Base class for QtAutoGen gernerators
+/** \class cmQtAutoGenerator
+ * \brief Base class for QtAutoGen generators
+ */
 class cmQtAutoGenerator : public cmQtAutoGen
 {
 public:
   // -- Types
 
-  /// @brief Thread safe logging
+  /**
+   * Thread safe logger
+   */
   class Logger
   {
   public:
@@ -37,24 +41,24 @@ public:
     bool ColorOutput() const { return this->ColorOutput_; }
     void SetColorOutput(bool value);
     // -- Log info
-    void Info(GenT genType, std::string const& message);
+    void Info(GenT genType, std::string const& message) const;
     // -- Log warning
-    void Warning(GenT genType, std::string const& message);
+    void Warning(GenT genType, std::string const& message) const;
     void WarningFile(GenT genType, std::string const& filename,
-                     std::string const& message);
+                     std::string const& message) const;
     // -- Log error
-    void Error(GenT genType, std::string const& message);
+    void Error(GenT genType, std::string const& message) const;
     void ErrorFile(GenT genType, std::string const& filename,
-                   std::string const& message);
+                   std::string const& message) const;
     void ErrorCommand(GenT genType, std::string const& message,
                       std::vector<std::string> const& command,
-                      std::string const& output);
+                      std::string const& output) const;
 
   private:
     static std::string HeadLine(std::string const& title);
 
   private:
-    std::mutex Mutex_;
+    mutable std::mutex Mutex_;
     unsigned int Verbosity_ = 0;
     bool ColorOutput_ = false;
   };
@@ -66,70 +70,8 @@ public:
   static bool FileWrite(std::string const& filename,
                         std::string const& content,
                         std::string* error = nullptr);
-
-  /// @brief Thread safe file system interface
-  class FileSystem
-  {
-  public:
-    FileSystem();
-    ~FileSystem();
-
-    // -- Paths
-    /// @brief Wrapper for cmSystemTools::GetRealPath
-    std::string GetRealPath(std::string const& filename);
-    /// @brief Wrapper for cmSystemTools::CollapseFullPath
-    std::string CollapseFullPath(std::string const& file,
-                                 std::string const& dir);
-    /// @brief Wrapper for cmSystemTools::SplitPath
-    void SplitPath(const std::string& p, std::vector<std::string>& components,
-                   bool expand_home_dir = true);
-    /// @brief Wrapper for cmSystemTools::JoinPath
-    std::string JoinPath(const std::vector<std::string>& components);
-    /// @brief Wrapper for cmSystemTools::JoinPath
-    std::string JoinPath(std::vector<std::string>::const_iterator first,
-                         std::vector<std::string>::const_iterator last);
-    /// @brief Wrapper for cmSystemTools::GetFilenameWithoutLastExtension
-    std::string GetFilenameWithoutLastExtension(const std::string& filename);
-    /// @brief Wrapper for cmQtAutoGen::SubDirPrefix
-    std::string SubDirPrefix(std::string const& filename);
-    /// @brief Wrapper for cmFilePathChecksum::setupParentDirs
-    void setupFilePathChecksum(std::string const& currentSrcDir,
-                               std::string const& currentBinDir,
-                               std::string const& projectSrcDir,
-                               std::string const& projectBinDir);
-    /// @brief Wrapper for cmFilePathChecksum::getPart
-    std::string GetFilePathChecksum(std::string const& filename);
-
-    // -- File access
-    /// @brief Wrapper for cmSystemTools::FileExists
-    bool FileExists(std::string const& filename);
-    /// @brief Wrapper for cmSystemTools::FileExists
-    bool FileExists(std::string const& filename, bool isFile);
-    /// @brief Wrapper for cmSystemTools::FileLength
-    unsigned long FileLength(std::string const& filename);
-    bool FileIsOlderThan(std::string const& buildFile,
-                         std::string const& sourceFile,
-                         std::string* error = nullptr);
-
-    bool FileRead(std::string& content, std::string const& filename,
-                  std::string* error = nullptr);
-
-    bool FileWrite(std::string const& filename, std::string const& content,
-                   std::string* error = nullptr);
-
-    bool FileDiffers(std::string const& filename, std::string const& content);
-
-    bool FileRemove(std::string const& filename);
-    bool Touch(std::string const& filename, bool create = false);
-
-    // -- Directory access
-    bool MakeDirectory(std::string const& dirname);
-    bool MakeParentDirectory(std::string const& filename);
-
-  private:
-    std::mutex Mutex_;
-    cmFilePathChecksum FilePathChecksum_;
-  };
+  static bool FileDiffers(std::string const& filename,
+                          std::string const& content);
 
 public:
   // -- Constructors
@@ -142,8 +84,9 @@ public:
   // -- Run
   bool Run(std::string const& infoFile, std::string const& config);
 
-  // InfoFile
+  // -- InfoFile
   std::string const& InfoFile() const { return InfoFile_; }
+  cmFileTime const& InfoFileTime() const { return InfoFileTime_; }
   std::string const& InfoDir() const { return InfoDir_; }
   std::string const& InfoConfig() const { return InfoConfig_; }
 
@@ -158,6 +101,7 @@ protected:
 private:
   // -- Info settings
   std::string InfoFile_;
+  cmFileTime InfoFileTime_;
   std::string InfoDir_;
   std::string InfoConfig_;
 };
diff --git a/Source/cmQtAutoMocUic.cxx b/Source/cmQtAutoMocUic.cxx
index 005c27d..36794d6 100644
--- a/Source/cmQtAutoMocUic.cxx
+++ b/Source/cmQtAutoMocUic.cxx
@@ -4,7 +4,6 @@
 
 #include <algorithm>
 #include <array>
-#include <deque>
 #include <list>
 #include <memory>
 #include <set>
@@ -13,67 +12,187 @@
 
 #include "cmAlgorithms.h"
 #include "cmCryptoHash.h"
+#include "cmGeneratedFileStream.h"
 #include "cmMakefile.h"
 #include "cmQtAutoGen.h"
 #include "cmSystemTools.h"
 #include "cmake.h"
+#include "cmsys/FStream.hxx"
 
 #if defined(__APPLE__)
 #  include <unistd.h>
 #endif
 
-// -- Class methods
+static constexpr std::size_t MocUnderscoreLength = 4; // Length of "moc_"
+static constexpr std::size_t UiUnderscoreLength = 3;  // Length of "ui_"
 
-std::string cmQtAutoMocUic::BaseSettingsT::AbsoluteBuildPath(
-  std::string const& relativePath) const
+cmQtAutoMocUic::IncludeKeyT::IncludeKeyT(std::string const& key,
+                                         std::size_t basePrefixLength)
+  : Key(key)
+  , Dir(SubDirPrefix(key))
+  , Base(cmSystemTools::GetFilenameWithoutLastExtension(key))
 {
-  return FileSys->CollapseFullPath(relativePath, AutogenBuildDir);
+  if (basePrefixLength != 0) {
+    Base = Base.substr(basePrefixLength);
+  }
 }
 
-/**
- * @brief Tries to find the header file to the given file base path by
- * appending different header extensions
- * @return True on success
- */
-bool cmQtAutoMocUic::BaseSettingsT::FindHeader(
-  std::string& header, std::string const& testBasePath) const
+void cmQtAutoMocUic::ParseCacheT::FileT::Clear()
 {
-  for (std::string const& ext : HeaderExtensions) {
-    std::string testFilePath(testBasePath);
-    testFilePath.push_back('.');
-    testFilePath += ext;
-    if (FileSys->FileExists(testFilePath)) {
-      header = testFilePath;
-      return true;
+  Moc.Macro.clear();
+  Moc.Include.Underscore.clear();
+  Moc.Include.Dot.clear();
+  Moc.Depends.clear();
+
+  Uic.Include.clear();
+  Uic.Depends.clear();
+}
+
+cmQtAutoMocUic::ParseCacheT::FileHandleT cmQtAutoMocUic::ParseCacheT::Get(
+  std::string const& fileName) const
+{
+  auto it = Map_.find(fileName);
+  if (it != Map_.end()) {
+    return it->second;
+  }
+  return FileHandleT();
+}
+
+cmQtAutoMocUic::ParseCacheT::GetOrInsertT
+cmQtAutoMocUic::ParseCacheT::GetOrInsert(std::string const& fileName)
+{
+  // Find existing entry
+  {
+    auto it = Map_.find(fileName);
+    if (it != Map_.end()) {
+      return GetOrInsertT{ it->second, false };
     }
   }
-  return false;
+
+  // Insert new entry
+  return GetOrInsertT{
+    Map_.emplace(fileName, std::make_shared<FileT>()).first->second, true
+  };
 }
 
-bool cmQtAutoMocUic::MocSettingsT::skipped(std::string const& fileName) const
+cmQtAutoMocUic::ParseCacheT::ParseCacheT() = default;
+cmQtAutoMocUic::ParseCacheT::~ParseCacheT() = default;
+
+void cmQtAutoMocUic::ParseCacheT::Clear()
 {
-  return (!Enabled || (SkipList.find(fileName) != SkipList.end()));
+  Map_.clear();
 }
 
-/**
- * @brief Returns the first relevant Qt macro name found in the given C++ code
- * @return The name of the Qt macro or an empty string
- */
-std::string cmQtAutoMocUic::MocSettingsT::FindMacro(
-  std::string const& content) const
+bool cmQtAutoMocUic::ParseCacheT::ReadFromFile(std::string const& fileName)
 {
-  for (KeyExpT const& filter : MacroFilters) {
-    // Run a simple find string operation before the expensive
-    // regular expression check
-    if (content.find(filter.Key) != std::string::npos) {
-      cmsys::RegularExpressionMatch match;
-      if (filter.Exp.find(content.c_str(), match)) {
-        // Return macro name on demand
-        return filter.Key;
+  cmsys::ifstream fin(fileName.c_str());
+  if (!fin) {
+    return false;
+  }
+  FileHandleT fileHandle;
+
+  std::string line;
+  while (std::getline(fin, line)) {
+    // Check if this an empty or a comment line
+    if (line.empty() || line.front() == '#') {
+      continue;
+    }
+    // Drop carriage return character at the end
+    if (line.back() == '\r') {
+      line.pop_back();
+      if (line.empty()) {
+        continue;
       }
     }
+    // Check if this a file name line
+    if (line.front() != ' ') {
+      fileHandle = GetOrInsert(line).first;
+      continue;
+    }
+
+    // Bad line or bad file handle
+    if (!fileHandle || (line.size() < 6)) {
+      continue;
+    }
+
+    constexpr std::size_t offset = 5;
+    if (cmHasLiteralPrefix(line, " mmc:")) {
+      fileHandle->Moc.Macro = line.substr(offset);
+      continue;
+    }
+    if (cmHasLiteralPrefix(line, " miu:")) {
+      fileHandle->Moc.Include.Underscore.emplace_back(line.substr(offset),
+                                                      MocUnderscoreLength);
+      continue;
+    }
+    if (cmHasLiteralPrefix(line, " mid:")) {
+      fileHandle->Moc.Include.Dot.emplace_back(line.substr(offset), 0);
+      continue;
+    }
+    if (cmHasLiteralPrefix(line, " mdp:")) {
+      fileHandle->Moc.Depends.emplace_back(line.substr(offset));
+      continue;
+    }
+    if (cmHasLiteralPrefix(line, " uic:")) {
+      fileHandle->Uic.Include.emplace_back(line.substr(offset),
+                                           UiUnderscoreLength);
+      continue;
+    }
+    if (cmHasLiteralPrefix(line, " udp:")) {
+      fileHandle->Uic.Depends.emplace_back(line.substr(offset));
+      continue;
+    }
+  }
+  return true;
+}
+
+bool cmQtAutoMocUic::ParseCacheT::WriteToFile(std::string const& fileName)
+{
+  cmGeneratedFileStream ofs(fileName);
+  if (!ofs) {
+    return false;
+  }
+  ofs << "# Generated by CMake. Changes will be overwritten." << std::endl;
+  for (auto const& pair : Map_) {
+    ofs << pair.first << std::endl;
+    FileT const& file = *pair.second;
+    if (!file.Moc.Macro.empty()) {
+      ofs << " mmc:" << file.Moc.Macro << std::endl;
+    }
+    for (IncludeKeyT const& item : file.Moc.Include.Underscore) {
+      ofs << " miu:" << item.Key << std::endl;
+    }
+    for (IncludeKeyT const& item : file.Moc.Include.Dot) {
+      ofs << " mid:" << item.Key << std::endl;
+    }
+    for (std::string const& item : file.Moc.Depends) {
+      ofs << " mdp:" << item << std::endl;
+    }
+    for (IncludeKeyT const& item : file.Uic.Include) {
+      ofs << " uic:" << item.Key << std::endl;
+    }
+    for (std::string const& item : file.Uic.Depends) {
+      ofs << " udp:" << item << std::endl;
+    }
   }
-  return std::string();
+  return ofs.Close();
+}
+
+cmQtAutoMocUic::BaseSettingsT::BaseSettingsT() = default;
+cmQtAutoMocUic::BaseSettingsT::~BaseSettingsT() = default;
+
+cmQtAutoMocUic::MocSettingsT::MocSettingsT()
+{
+  RegExpInclude.compile(
+    "(^|\n)[ \t]*#[ \t]*include[ \t]+"
+    "[\"<](([^ \">]+/)?moc_[^ \">/]+\\.cpp|[^ \">]+\\.moc)[\">]");
+}
+
+cmQtAutoMocUic::MocSettingsT::~MocSettingsT() = default;
+
+bool cmQtAutoMocUic::MocSettingsT::skipped(std::string const& fileName) const
+{
+  return (!Enabled || (SkipList.find(fileName) != SkipList.end()));
 }
 
 std::string cmQtAutoMocUic::MocSettingsT::MacrosString() const
@@ -98,53 +217,13 @@ std::string cmQtAutoMocUic::MocSettingsT::MacrosString() const
   return res;
 }
 
-std::string cmQtAutoMocUic::MocSettingsT::FindIncludedFile(
-  std::string const& sourcePath, std::string const& includeString) const
+cmQtAutoMocUic::UicSettingsT::UicSettingsT()
 {
-  // Search in vicinity of the source
-  {
-    std::string testPath = sourcePath;
-    testPath += includeString;
-    if (FileSys->FileExists(testPath)) {
-      return FileSys->GetRealPath(testPath);
-    }
-  }
-  // Search in include directories
-  for (std::string const& path : IncludePaths) {
-    std::string fullPath = path;
-    fullPath.push_back('/');
-    fullPath += includeString;
-    if (FileSys->FileExists(fullPath)) {
-      return FileSys->GetRealPath(fullPath);
-    }
-  }
-  // Return empty string
-  return std::string();
+  RegExpInclude.compile("(^|\n)[ \t]*#[ \t]*include[ \t]+"
+                        "[\"<](([^ \">]+/)?ui_[^ \">/]+\\.h)[\">]");
 }
 
-void cmQtAutoMocUic::MocSettingsT::FindDependencies(
-  std::string const& content, std::set<std::string>& depends) const
-{
-  if (!DependFilters.empty() && !content.empty()) {
-    for (KeyExpT const& filter : DependFilters) {
-      // Run a simple find string check
-      if (content.find(filter.Key) != std::string::npos) {
-        // Run the expensive regular expression check loop
-        const char* contentChars = content.c_str();
-        cmsys::RegularExpressionMatch match;
-        while (filter.Exp.find(contentChars, match)) {
-          {
-            std::string dep = match.match(1);
-            if (!dep.empty()) {
-              depends.emplace(std::move(dep));
-            }
-          }
-          contentChars += match.end();
-        }
-      }
-    }
-  }
-}
+cmQtAutoMocUic::UicSettingsT::~UicSettingsT() = default;
 
 bool cmQtAutoMocUic::UicSettingsT::skipped(std::string const& fileName) const
 {
@@ -176,498 +255,844 @@ void cmQtAutoMocUic::JobT::LogCommandError(
 
 bool cmQtAutoMocUic::JobT::RunProcess(GenT genType,
                                       cmWorkerPool::ProcessResultT& result,
-                                      std::vector<std::string> const& command)
+                                      std::vector<std::string> const& command,
+                                      std::string* infoMessage)
 {
   // Log command
   if (Log().Verbose()) {
-    std::string msg = "Running command:\n";
+    std::string msg;
+    if ((infoMessage != nullptr) && !infoMessage->empty()) {
+      msg = *infoMessage;
+      if (msg.back() != '\n') {
+        msg += '\n';
+      }
+    }
     msg += QuotedCommand(command);
     msg += '\n';
     Log().Info(genType, msg);
   }
   return cmWorkerPool::JobT::RunProcess(result, command,
-                                        Gen()->Base().AutogenBuildDir);
+                                        BaseConst().AutogenBuildDir);
 }
 
 void cmQtAutoMocUic::JobMocPredefsT::Process()
 {
   // (Re)generate moc_predefs.h on demand
-  bool generate(false);
-  bool fileExists(FileSys().FileExists(Gen()->Moc().PredefsFileAbs));
-  if (!fileExists) {
-    if (Log().Verbose()) {
-      std::string reason = "Generating ";
-      reason += Quoted(Gen()->Moc().PredefsFileRel);
-      reason += " because it doesn't exist";
-      Log().Info(GenT::MOC, reason);
-    }
-    generate = true;
-  } else if (Gen()->Moc().SettingsChanged) {
-    if (Log().Verbose()) {
-      std::string reason = "Generating ";
-      reason += Quoted(Gen()->Moc().PredefsFileRel);
-      reason += " because the settings changed.";
-      Log().Info(GenT::MOC, reason);
-    }
-    generate = true;
+  std::unique_ptr<std::string> reason;
+  if (Log().Verbose()) {
+    reason = cm::make_unique<std::string>();
+  }
+  if (!Update(reason.get())) {
+    return;
   }
-  if (generate) {
+  std::string const& predefsFileRel = MocConst().PredefsFileRel;
+  std::string const& predefsFileAbs = MocConst().PredefsFileAbs;
+  {
     cmWorkerPool::ProcessResultT result;
     {
       // Compose command
-      std::vector<std::string> cmd = Gen()->Moc().PredefsCmd;
+      std::vector<std::string> cmd = MocConst().PredefsCmd;
       // Add includes
-      cmd.insert(cmd.end(), Gen()->Moc().Includes.begin(),
-                 Gen()->Moc().Includes.end());
+      cmd.insert(cmd.end(), MocConst().Includes.begin(),
+                 MocConst().Includes.end());
       // Add definitions
-      for (std::string const& def : Gen()->Moc().Definitions) {
+      for (std::string const& def : MocConst().Definitions) {
         cmd.push_back("-D" + def);
       }
       // Execute command
-      if (!RunProcess(GenT::MOC, result, cmd)) {
-        std::string emsg = "The content generation command for ";
-        emsg += Quoted(Gen()->Moc().PredefsFileRel);
-        emsg += " failed.\n";
-        emsg += result.ErrorMessage;
-        LogCommandError(GenT::MOC, emsg, cmd, result.StdOut);
+      if (!RunProcess(GenT::MOC, result, cmd, reason.get())) {
+        std::string msg = "The content generation command for ";
+        msg += Quoted(predefsFileRel);
+        msg += " failed.\n";
+        msg += result.ErrorMessage;
+        LogCommandError(GenT::MOC, msg, cmd, result.StdOut);
+        return;
       }
     }
 
     // (Re)write predefs file only on demand
-    if (!result.error()) {
-      if (!fileExists ||
-          FileSys().FileDiffers(Gen()->Moc().PredefsFileAbs, result.StdOut)) {
-        if (FileSys().FileWrite(Gen()->Moc().PredefsFileAbs, result.StdOut)) {
-          // Success
-        } else {
-          std::string emsg = "Writing ";
-          emsg += Quoted(Gen()->Moc().PredefsFileRel);
-          emsg += " failed.";
-          LogFileError(GenT::MOC, Gen()->Moc().PredefsFileAbs, emsg);
-        }
-      } else {
-        // Touch to update the time stamp
-        if (Log().Verbose()) {
-          std::string msg = "Touching ";
-          msg += Quoted(Gen()->Moc().PredefsFileRel);
-          msg += ".";
-          Log().Info(GenT::MOC, msg);
-        }
-        FileSys().Touch(Gen()->Moc().PredefsFileAbs);
+    if (cmQtAutoGenerator::FileDiffers(predefsFileAbs, result.StdOut)) {
+      if (!cmQtAutoGenerator::FileWrite(predefsFileAbs, result.StdOut)) {
+        std::string msg = "Writing ";
+        msg += Quoted(predefsFileRel);
+        msg += " failed.";
+        LogFileError(GenT::MOC, predefsFileAbs, msg);
+        return;
+      }
+    } else {
+      // Touch to update the time stamp
+      if (Log().Verbose()) {
+        Log().Info(GenT::MOC, "Touching " + Quoted(predefsFileRel));
+      }
+      if (!cmSystemTools::Touch(predefsFileAbs, false)) {
+        std::string msg = "Touching ";
+        msg += Quoted(predefsFileAbs);
+        msg += " failed.";
+        LogFileError(GenT::MOC, predefsFileAbs, msg);
+        return;
       }
     }
   }
+
+  // Read file time afterwards
+  if (!MocEval().PredefsTime.Load(predefsFileAbs)) {
+    LogFileError(GenT::MOC, predefsFileAbs, "File time reading failed.");
+    return;
+  }
 }
 
-void cmQtAutoMocUic::JobParseT::Process()
+bool cmQtAutoMocUic::JobMocPredefsT::Update(std::string* reason) const
 {
-  if (AutoMoc && Header) {
-    // Don't parse header for moc if the file is included by a source already
-    if (Gen()->ParallelMocIncluded(FileName)) {
-      AutoMoc = false;
+  // Test if the file exists
+  if (!MocEval().PredefsTime.Load(MocConst().PredefsFileAbs)) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(MocConst().PredefsFileRel);
+      *reason += ", because it doesn't exist.";
     }
+    return true;
   }
 
-  if (AutoMoc || AutoUic) {
-    std::string error;
-    MetaT meta;
-    if (FileSys().FileRead(meta.Content, FileName, &error)) {
-      if (!meta.Content.empty()) {
-        meta.FileDir = FileSys().SubDirPrefix(FileName);
-        meta.FileBase = FileSys().GetFilenameWithoutLastExtension(FileName);
-
-        bool success = true;
-        if (AutoMoc) {
-          if (Header) {
-            success = ParseMocHeader(meta);
-          } else {
-            success = ParseMocSource(meta);
-          }
-        }
-        if (AutoUic && success) {
-          ParseUic(meta);
+  // Test if the settings changed
+  if (MocConst().SettingsChanged) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(MocConst().PredefsFileRel);
+      *reason += ", because the moc settings changed.";
+    }
+    return true;
+  }
+
+  // Test if the executable is newer
+  {
+    std::string const& exec = MocConst().PredefsCmd.at(0);
+    cmFileTime execTime;
+    if (execTime.Load(exec)) {
+      if (MocEval().PredefsTime.Older(execTime)) {
+        if (reason != nullptr) {
+          *reason = "Generating ";
+          *reason += Quoted(MocConst().PredefsFileRel);
+          *reason += " because it is older than ";
+          *reason += Quoted(exec);
+          *reason += ".";
         }
-      } else {
-        Log().WarningFile(GenT::GEN, FileName, "The source file is empty");
+        return true;
       }
-    } else {
-      LogFileError(GenT::GEN, FileName, "Could not read the file: " + error);
     }
   }
+
+  return false;
 }
 
-bool cmQtAutoMocUic::JobParseT::ParseMocSource(MetaT const& meta)
+bool cmQtAutoMocUic::JobParseT::ReadFile()
 {
-  struct JobPre
+  // Clear old parse information
+  FileHandle->ParseData->Clear();
+  std::string const& fileName = FileHandle->FileName;
+  // Write info
+  if (Log().Verbose()) {
+    Log().Info(GenT::GEN, "Parsing " + Quoted(fileName));
+  }
+  // Read file content
   {
-    bool self;       // source file is self
-    bool underscore; // "moc_" style include
-    std::string SourceFile;
-    std::string IncludeString;
-  };
+    std::string error;
+    if (!cmQtAutoGenerator::FileRead(Content, fileName, &error)) {
+      LogFileError(GenT::GEN, fileName, "Could not read the file: " + error);
+      return false;
+    }
+  }
+  // Warn if empty
+  if (Content.empty()) {
+    Log().WarningFile(GenT::GEN, fileName, "The file is empty.");
+    return false;
+  }
+  return true;
+}
+
+void cmQtAutoMocUic::JobParseT::CreateKeys(std::vector<IncludeKeyT>& container,
+                                           std::set<std::string> const& source,
+                                           std::size_t basePrefixLength)
+{
+  if (source.empty()) {
+    return;
+  }
+  container.reserve(source.size());
+  for (std::string const& src : source) {
+    container.emplace_back(src, basePrefixLength);
+  }
+}
+
+void cmQtAutoMocUic::JobParseT::MocMacro()
+{
+  for (KeyExpT const& filter : MocConst().MacroFilters) {
+    // Run a simple find string check
+    if (Content.find(filter.Key) == std::string::npos) {
+      continue;
+    }
+    // Run the expensive regular expression check loop
+    cmsys::RegularExpressionMatch match;
+    if (filter.Exp.find(Content.c_str(), match)) {
+      // Keep detected macro name
+      FileHandle->ParseData->Moc.Macro = filter.Key;
+      return;
+    }
+  }
+}
+
+void cmQtAutoMocUic::JobParseT::MocDependecies()
+{
+  if (MocConst().DependFilters.empty()) {
+    return;
+  }
 
-  struct MocInclude
+  // Find dependency strings
+  std::set<std::string> parseDepends;
+  for (KeyExpT const& filter : MocConst().DependFilters) {
+    // Run a simple find string check
+    if (Content.find(filter.Key) == std::string::npos) {
+      continue;
+    }
+    // Run the expensive regular expression check loop
+    const char* contentChars = Content.c_str();
+    cmsys::RegularExpressionMatch match;
+    while (filter.Exp.find(contentChars, match)) {
+      {
+        std::string dep = match.match(1);
+        if (!dep.empty()) {
+          parseDepends.emplace(std::move(dep));
+        }
+      }
+      contentChars += match.end();
+    }
+  }
+
+  // Store dependency strings
   {
-    std::string Inc;  // full include string
-    std::string Dir;  // include string directory
-    std::string Base; // include string file base
-  };
+    auto& Depends = FileHandle->ParseData->Moc.Depends;
+    Depends.reserve(parseDepends.size());
+    for (std::string const& item : parseDepends) {
+      Depends.emplace_back(item);
+      // Replace end of line characters in filenames
+      std::string& path = Depends.back();
+      std::replace(path.begin(), path.end(), '\n', ' ');
+      std::replace(path.begin(), path.end(), '\r', ' ');
+    }
+  }
+}
 
-  // Check if this source file contains a relevant macro
-  std::string const ownMacro = Gen()->Moc().FindMacro(meta.Content);
+void cmQtAutoMocUic::JobParseT::MocIncludes()
+{
+  if (Content.find("moc") == std::string::npos) {
+    return;
+  }
 
-  // Extract moc includes from file
-  std::deque<MocInclude> mocIncsUsc;
-  std::deque<MocInclude> mocIncsDot;
+  std::set<std::string> underscore;
+  std::set<std::string> dot;
   {
-    if (meta.Content.find("moc") != std::string::npos) {
-      const char* contentChars = meta.Content.c_str();
-      cmsys::RegularExpressionMatch match;
-      while (Gen()->Moc().RegExpInclude.find(contentChars, match)) {
-        std::string incString = match.match(2);
-        std::string incDir(FileSys().SubDirPrefix(incString));
-        std::string incBase =
-          FileSys().GetFilenameWithoutLastExtension(incString);
-        if (cmHasLiteralPrefix(incBase, "moc_")) {
-          // moc_<BASE>.cxx
-          // Remove the moc_ part from the base name
-          mocIncsUsc.emplace_back(MocInclude{
-            std::move(incString), std::move(incDir), incBase.substr(4) });
-        } else {
-          // <BASE>.moc
-          mocIncsDot.emplace_back(MocInclude{
-            std::move(incString), std::move(incDir), std::move(incBase) });
-        }
-        // Forward content pointer
-        contentChars += match.end();
+    const char* contentChars = Content.c_str();
+    cmsys::RegularExpression const& regExp = MocConst().RegExpInclude;
+    cmsys::RegularExpressionMatch match;
+    while (regExp.find(contentChars, match)) {
+      std::string incString = match.match(2);
+      std::string const incBase =
+        cmSystemTools::GetFilenameWithoutLastExtension(incString);
+      if (cmHasLiteralPrefix(incBase, "moc_")) {
+        // moc_<BASE>.cpp
+        // Remove the moc_ part from the base name
+        underscore.emplace(std::move(incString));
+      } else {
+        // <BASE>.moc
+        dot.emplace(std::move(incString));
+      }
+      // Forward content pointer
+      contentChars += match.end();
+    }
+  }
+  auto& Include = FileHandle->ParseData->Moc.Include;
+  CreateKeys(Include.Underscore, underscore, MocUnderscoreLength);
+  CreateKeys(Include.Dot, dot, 0);
+}
+
+void cmQtAutoMocUic::JobParseT::UicIncludes()
+{
+  if (Content.find("ui_") == std::string::npos) {
+    return;
+  }
+
+  std::set<std::string> includes;
+  {
+    const char* contentChars = Content.c_str();
+    cmsys::RegularExpression const& regExp = UicConst().RegExpInclude;
+    cmsys::RegularExpressionMatch match;
+    while (regExp.find(contentChars, match)) {
+      includes.emplace(match.match(2));
+      // Forward content pointer
+      contentChars += match.end();
+    }
+  }
+  CreateKeys(FileHandle->ParseData->Uic.Include, includes, UiUnderscoreLength);
+}
+
+void cmQtAutoMocUic::JobParseHeaderT::Process()
+{
+  if (!ReadFile()) {
+    return;
+  }
+  // Moc parsing
+  if (FileHandle->Moc) {
+    MocMacro();
+    MocDependecies();
+  }
+  // Uic parsing
+  if (FileHandle->Uic) {
+    UicIncludes();
+  }
+}
+
+void cmQtAutoMocUic::JobParseSourceT::Process()
+{
+  if (!ReadFile()) {
+    return;
+  }
+  // Moc parsing
+  if (FileHandle->Moc) {
+    MocMacro();
+    MocDependecies();
+    MocIncludes();
+  }
+  // Uic parsing
+  if (FileHandle->Uic) {
+    UicIncludes();
+  }
+}
+
+void cmQtAutoMocUic::JobEvaluateT::Process()
+{
+  // Evaluate for moc
+  if (MocConst().Enabled) {
+    // Evaluate headers
+    for (auto const& pair : BaseEval().Headers) {
+      if (!MocEvalHeader(pair.second)) {
+        return;
+      }
+    }
+    // Evaluate sources
+    for (auto const& pair : BaseEval().Sources) {
+      if (!MocEvalSource(pair.second)) {
+        return;
       }
     }
   }
+  // Evaluate for uic
+  if (UicConst().Enabled) {
+    if (!UicEval(BaseEval().Headers) || !UicEval(BaseEval().Sources)) {
+      return;
+    }
+  }
 
-  // Check if there is anything to do
-  if (ownMacro.empty() && mocIncsUsc.empty() && mocIncsDot.empty()) {
+  // Add discovered header parse jobs
+  Gen()->CreateParseJobs<JobParseHeaderT>(MocEval().HeadersDiscovered);
+  // Add generate job after
+  Gen()->WorkerPool().EmplaceJob<JobGenerateT>();
+}
+
+bool cmQtAutoMocUic::JobEvaluateT::MocEvalHeader(SourceFileHandleT source)
+{
+  SourceFileT const& sourceFile = *source;
+  auto const& parseData = sourceFile.ParseData->Moc;
+  if (!source->Moc) {
     return true;
   }
 
-  bool ownDotMocIncluded = false;
-  bool ownMocUscIncluded = false;
-  std::deque<JobPre> jobs;
+  if (!parseData.Macro.empty()) {
+    // Create a new mapping
+    MappingHandleT handle = std::make_shared<MappingT>();
+    handle->SourceFile = std::move(source);
 
-  // Process moc_<BASE>.cxx includes
-  for (const MocInclude& mocInc : mocIncsUsc) {
-    std::string const header =
-      MocFindIncludedHeader(meta.FileDir, mocInc.Dir + mocInc.Base);
-    if (!header.empty()) {
-      // Check if header is skipped
-      if (Gen()->Moc().skipped(header)) {
-        continue;
+    // Absolute build path
+    if (BaseConst().MultiConfig) {
+      handle->OutputFile = Gen()->AbsoluteIncludePath(sourceFile.BuildPath);
+    } else {
+      handle->OutputFile = Gen()->AbsoluteBuildPath(sourceFile.BuildPath);
+    }
+
+    // Register mapping in headers map
+    MocRegisterMapping(handle, true);
+  }
+
+  return true;
+}
+
+bool cmQtAutoMocUic::JobEvaluateT::MocEvalSource(
+  SourceFileHandleT const& source)
+{
+  SourceFileT const& sourceFile = *source;
+  auto const& parseData = sourceFile.ParseData->Moc;
+  if (!sourceFile.Moc ||
+      (parseData.Macro.empty() && parseData.Include.Underscore.empty() &&
+       parseData.Include.Dot.empty())) {
+    return true;
+  }
+
+  std::string const sourceDir = SubDirPrefix(sourceFile.FileName);
+  std::string const sourceBase =
+    cmSystemTools::GetFilenameWithoutLastExtension(sourceFile.FileName);
+
+  // For relaxed mode check if the own "moc_" or ".moc" file is included
+  bool const relaxedMode = MocConst().RelaxedMode;
+  bool sourceIncludesMocUnderscore = false;
+  bool sourceIncludesDotMoc = false;
+  // Check if the sources own "moc_" or ".moc" file is included
+  if (relaxedMode) {
+    for (IncludeKeyT const& incKey : parseData.Include.Underscore) {
+      if (incKey.Base == sourceBase) {
+        sourceIncludesMocUnderscore = true;
+        break;
       }
-      // Register moc job
-      const bool ownMoc = (mocInc.Base == meta.FileBase);
-      jobs.emplace_back(JobPre{ ownMoc, true, header, mocInc.Inc });
-      // Store meta information for relaxed mode
-      if (ownMoc) {
-        ownMocUscIncluded = true;
+    }
+  }
+  for (IncludeKeyT const& incKey : parseData.Include.Dot) {
+    if (incKey.Base == sourceBase) {
+      sourceIncludesDotMoc = true;
+      break;
+    }
+  }
+
+  // Check if this source needs to be moc processed but doesn't.
+  if (!sourceIncludesDotMoc && !parseData.Macro.empty() &&
+      !(relaxedMode && sourceIncludesMocUnderscore)) {
+    {
+      std::string emsg = "The file contains a ";
+      emsg += Quoted(parseData.Macro);
+      emsg += " macro, but does not include ";
+      emsg += Quoted(sourceBase + ".moc");
+      emsg += "!\nConsider to\n  - add #include \"";
+      emsg += sourceBase;
+      emsg += ".moc\"\n  - enable SKIP_AUTOMOC for this file";
+      LogFileError(GenT::MOC, sourceFile.FileName, emsg);
+    }
+    return false;
+  }
+
+  // Evaluate "moc_" includes
+  for (IncludeKeyT const& incKey : parseData.Include.Underscore) {
+    std::string const headerBase = incKey.Dir + incKey.Base;
+    SourceFileHandleT header = MocFindIncludedHeader(sourceDir, headerBase);
+    if (!header) {
+      {
+        std::string msg = "The file includes the moc file ";
+        msg += Quoted(incKey.Key);
+        msg += ",\nbut the header could not be found "
+               "in the following locations\n";
+        msg += MocMessageTestHeaders(headerBase);
+        LogFileError(GenT::MOC, sourceFile.FileName, msg);
       }
-    } else {
+      return false;
+    }
+    // The include might be handled differently in relaxed mode
+    if (relaxedMode && !sourceIncludesDotMoc && !parseData.Macro.empty() &&
+        (incKey.Base == sourceBase)) {
+      // The <BASE>.cpp file includes a Qt macro but does not include the
+      // <BASE>.moc file. In this case, the moc_<BASE>.cpp should probably
+      // be generated from <BASE>.cpp instead of <BASE>.h, because otherwise
+      // it won't build. But warn, since this is not how it is supposed to be
+      // used. This is for KDE4 compatibility.
       {
-        std::string emsg = "The file includes the moc file ";
-        emsg += Quoted(mocInc.Inc);
-        emsg += ", but the header ";
-        emsg += Quoted(MocStringHeaders(mocInc.Base));
-        emsg += " could not be found.";
-        LogFileError(GenT::MOC, FileName, emsg);
+        // Issue a warning
+        std::string msg = "The file contains a ";
+        msg += Quoted(parseData.Macro);
+        msg += " macro, but does not include ";
+        msg += Quoted(sourceBase + ".moc");
+        msg += ".\nInstead it includes ";
+        msg += Quoted(incKey.Key);
+        msg += ".\nRunning moc on the source\n  ";
+        msg += Quoted(sourceFile.FileName);
+        msg += "!\nBetter include ";
+        msg += Quoted(sourceBase + ".moc");
+        msg += " for compatibility with strict mode.\n";
+        msg += "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n";
+        Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
       }
+      // Create mapping
+      if (!MocRegisterIncluded(incKey.Key, source, source, false)) {
+        return false;
+      }
+      continue;
+    }
+
+    // Check if header is skipped
+    if (MocConst().skipped(header->FileName)) {
+      continue;
+    }
+    // Create mapping
+    if (!MocRegisterIncluded(incKey.Key, source, std::move(header), true)) {
       return false;
     }
   }
 
-  // Process <BASE>.moc includes
-  for (const MocInclude& mocInc : mocIncsDot) {
-    const bool ownMoc = (mocInc.Base == meta.FileBase);
-    if (Gen()->Moc().RelaxedMode) {
-      // Relaxed mode
-      if (!ownMacro.empty() && ownMoc) {
-        // Add self
-        jobs.emplace_back(JobPre{ ownMoc, false, FileName, mocInc.Inc });
-        ownDotMocIncluded = true;
-      } else {
-        // In relaxed mode try to find a header instead but issue a warning.
-        // This is for KDE4 compatibility
-        std::string const header =
-          MocFindIncludedHeader(meta.FileDir, mocInc.Dir + mocInc.Base);
-        if (!header.empty()) {
-          // Check if header is skipped
-          if (Gen()->Moc().skipped(header)) {
-            continue;
-          }
-          // Register moc job
-          jobs.emplace_back(JobPre{ ownMoc, false, header, mocInc.Inc });
-          if (ownMacro.empty()) {
-            if (ownMoc) {
-              std::string emsg = "The file includes the moc file ";
-              emsg += Quoted(mocInc.Inc);
-              emsg += ", but does not contain a ";
-              emsg += Gen()->Moc().MacrosString();
-              emsg += " macro.\nRunning moc on\n  ";
-              emsg += Quoted(header);
-              emsg += "!\nBetter include ";
-              emsg += Quoted("moc_" + mocInc.Base + ".cpp");
-              emsg += " for a compatibility with strict mode.\n"
-                      "(CMAKE_AUTOMOC_RELAXED_MODE warning)\n";
-              Log().WarningFile(GenT::MOC, FileName, emsg);
-            } else {
-              std::string emsg = "The file includes the moc file ";
-              emsg += Quoted(mocInc.Inc);
-              emsg += " instead of ";
-              emsg += Quoted("moc_" + mocInc.Base + ".cpp");
-              emsg += ".\nRunning moc on\n  ";
-              emsg += Quoted(header);
-              emsg += "!\nBetter include ";
-              emsg += Quoted("moc_" + mocInc.Base + ".cpp");
-              emsg += " for compatibility with strict mode.\n"
-                      "(CMAKE_AUTOMOC_RELAXED_MODE warning)\n";
-              Log().WarningFile(GenT::MOC, FileName, emsg);
-            }
-          }
-        } else {
-          {
-            std::string emsg = "The file includes the moc file ";
-            emsg += Quoted(mocInc.Inc);
-            emsg += ", which seems to be the moc file from a different "
-                    "source file.\nCMAKE_AUTOMOC_RELAXED_MODE: Also a "
-                    "matching header ";
-            emsg += Quoted(MocStringHeaders(mocInc.Base));
-            emsg += " could not be found.";
-            LogFileError(GenT::MOC, FileName, emsg);
-          }
+  // Evaluate ".moc" includes
+  if (relaxedMode) {
+    // Relaxed mode
+    for (IncludeKeyT const& incKey : parseData.Include.Dot) {
+      // Check if this is the sources own .moc file
+      bool const ownMoc = (incKey.Base == sourceBase);
+      if (ownMoc && !parseData.Macro.empty()) {
+        // Create mapping for the regular use case
+        if (!MocRegisterIncluded(incKey.Key, source, source, false)) {
           return false;
         }
+        continue;
       }
-    } else {
-      // Strict mode
-      if (ownMoc) {
-        // Include self
-        jobs.emplace_back(JobPre{ ownMoc, false, FileName, mocInc.Inc });
-        ownDotMocIncluded = true;
-        // Accept but issue a warning if moc isn't required
-        if (ownMacro.empty()) {
-          std::string emsg = "The file includes the moc file ";
-          emsg += Quoted(mocInc.Inc);
-          emsg += ", but does not contain a ";
-          emsg += Gen()->Moc().MacrosString();
-          emsg += " macro.";
-          Log().WarningFile(GenT::MOC, FileName, emsg);
-        }
+      // Try to find a header instead but issue a warning.
+      // This is for KDE4 compatibility.
+      std::string const headerBase = incKey.Dir + incKey.Base;
+      SourceFileHandleT header = MocFindIncludedHeader(sourceDir, headerBase);
+      if (!header) {
+        std::string msg = "The file includes the moc file ";
+        msg += Quoted(incKey.Key);
+        msg += ",\nwhich seems to be the moc file from a different source "
+               "file.\nCMAKE_AUTOMOC_RELAXED_MODE: Also a matching header"
+               "could not be found in the following locations\n";
+        msg += MocMessageTestHeaders(headerBase);
+        LogFileError(GenT::MOC, sourceFile.FileName, msg);
+        return false;
+      }
+      // Check if header is skipped
+      if (MocConst().skipped(header->FileName)) {
+        continue;
+      }
+      // Issue a warning
+      if (ownMoc && parseData.Macro.empty()) {
+        std::string msg = "The file includes the moc file ";
+        msg += Quoted(incKey.Key);
+        msg += ", but does not contain a\n";
+        msg += MocConst().MacrosString();
+        msg += " macro.\nRunning moc on the header\n  ";
+        msg += Quoted(header->FileName);
+        msg += "!\nBetter include ";
+        msg += Quoted("moc_" + incKey.Base + ".cpp");
+        msg += " for a compatibility with strict mode.\n";
+        msg += "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n";
+        Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
       } else {
-        // Don't allow <BASE>.moc include other than self in strict mode
-        {
-          std::string emsg = "The file includes the moc file ";
-          emsg += Quoted(mocInc.Inc);
-          emsg += ", which seems to be the moc file from a different "
-                  "source file.\nThis is not supported. Include ";
-          emsg += Quoted(meta.FileBase + ".moc");
-          emsg += " to run moc on this source file.";
-          LogFileError(GenT::MOC, FileName, emsg);
-        }
+        std::string msg = "The file includes the moc file ";
+        msg += Quoted(incKey.Key);
+        msg += " instead of ";
+        msg += Quoted("moc_" + incKey.Base + ".cpp");
+        msg += ".\nRunning moc on the header\n  ";
+        msg += Quoted(header->FileName);
+        msg += "!\nBetter include ";
+        msg += Quoted("moc_" + incKey.Base + ".cpp");
+        msg += " for compatibility with strict mode.\n";
+        msg += "This is a CMAKE_AUTOMOC_RELAXED_MODE warning.\n";
+        Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
+      }
+      // Create mapping
+      if (!MocRegisterIncluded(incKey.Key, source, std::move(header), true)) {
         return false;
       }
     }
-  }
-
-  if (!ownMacro.empty() && !ownDotMocIncluded) {
-    // In this case, check whether the scanned file itself contains a
-    // Q_OBJECT.
-    // If this is the case, the moc_foo.cpp should probably be generated from
-    // foo.cpp instead of foo.h, because otherwise it won't build.
-    // But warn, since this is not how it is supposed to be used.
-    // This is for KDE4 compatibility.
-    if (Gen()->Moc().RelaxedMode && ownMocUscIncluded) {
-      JobPre uscJobPre;
-      // Remove underscore job request
-      {
-        auto itC = jobs.begin();
-        auto itE = jobs.end();
-        for (; itC != itE; ++itC) {
-          JobPre& job(*itC);
-          if (job.self && job.underscore) {
-            uscJobPre = std::move(job);
-            jobs.erase(itC);
-            break;
-          }
-        }
+  } else {
+    // Strict mode
+    for (IncludeKeyT const& incKey : parseData.Include.Dot) {
+      // Check if this is the sources own .moc file
+      bool const ownMoc = (incKey.Base == sourceBase);
+      if (!ownMoc) {
+        // Don't allow <BASE>.moc include other than own in strict mode
+        std::string msg = "The file includes the moc file ";
+        msg += Quoted(incKey.Key);
+        msg += ",\nwhich seems to be the moc file from a different "
+               "source file.\nThis is not supported.  Include ";
+        msg += Quoted(sourceBase + ".moc");
+        msg += " to run moc on this source file.";
+        LogFileError(GenT::MOC, sourceFile.FileName, msg);
+        return false;
       }
-      // Issue a warning
-      {
-        std::string emsg = "The file contains a ";
-        emsg += ownMacro;
-        emsg += " macro, but does not include ";
-        emsg += Quoted(meta.FileBase + ".moc");
-        emsg += ". Instead it includes ";
-        emsg += Quoted(uscJobPre.IncludeString);
-        emsg += ".\nRunning moc on\n  ";
-        emsg += Quoted(FileName);
-        emsg += "!\nBetter include ";
-        emsg += Quoted(meta.FileBase + ".moc");
-        emsg += " for compatibility with strict mode.\n"
-                "(CMAKE_AUTOMOC_RELAXED_MODE warning)";
-        Log().WarningFile(GenT::MOC, FileName, emsg);
-      }
-      // Add own source job
-      jobs.emplace_back(
-        JobPre{ true, false, FileName, uscJobPre.IncludeString });
-    } else {
-      // Otherwise always error out since it will not compile.
-      {
-        std::string emsg = "The file contains a ";
-        emsg += ownMacro;
-        emsg += " macro, but does not include ";
-        emsg += Quoted(meta.FileBase + ".moc");
-        emsg += "!\nConsider to\n - add #include \"";
-        emsg += meta.FileBase;
-        emsg += ".moc\"\n - enable SKIP_AUTOMOC for this file";
-        LogFileError(GenT::MOC, FileName, emsg);
+      // Accept but issue a warning if moc isn't required
+      if (parseData.Macro.empty()) {
+        std::string msg = "The file includes the moc file ";
+        msg += Quoted(incKey.Key);
+        msg += ", but does not contain a ";
+        msg += MocConst().MacrosString();
+        msg += " macro.";
+        Log().WarningFile(GenT::MOC, sourceFile.FileName, msg);
+      }
+      // Create mapping
+      if (!MocRegisterIncluded(incKey.Key, source, source, false)) {
+        return false;
       }
-      return false;
     }
   }
 
-  // Convert pre jobs to actual jobs
-  for (JobPre& jobPre : jobs) {
-    cmWorkerPool::JobHandleT jobHandle = cm::make_unique<JobMocT>(
-      std::move(jobPre.SourceFile), FileName, std::move(jobPre.IncludeString));
-    if (jobPre.self) {
-      // Read dependencies from this source
-      JobMocT& jobMoc = static_cast<JobMocT&>(*jobHandle);
-      Gen()->Moc().FindDependencies(meta.Content, jobMoc.Depends);
-      jobMoc.DependsValid = true;
+  return true;
+}
+
+cmQtAutoMocUic::SourceFileHandleT
+cmQtAutoMocUic::JobEvaluateT::MocFindIncludedHeader(
+  std::string const& includerDir, std::string const& includeBase) const
+{
+  // Search in vicinity of the source
+  {
+    SourceFileHandleT res = MocFindHeader(includerDir + includeBase);
+    if (res) {
+      return res;
     }
-    if (!Gen()->ParallelJobPushMoc(std::move(jobHandle))) {
-      return false;
+  }
+  // Search in include directories
+  for (std::string const& path : MocConst().IncludePaths) {
+    std::string testPath = path;
+    testPath += '/';
+    testPath += includeBase;
+    SourceFileHandleT res = MocFindHeader(testPath);
+    if (res) {
+      return res;
     }
   }
-  return true;
+  // Return without success
+  return SourceFileHandleT();
 }
 
-bool cmQtAutoMocUic::JobParseT::ParseMocHeader(MetaT const& meta)
+cmQtAutoMocUic::SourceFileHandleT cmQtAutoMocUic::JobEvaluateT::MocFindHeader(
+  std::string const& basePath) const
 {
-  bool success = true;
-  std::string const macroName = Gen()->Moc().FindMacro(meta.Content);
-  if (!macroName.empty()) {
-    cmWorkerPool::JobHandleT jobHandle = cm::make_unique<JobMocT>(
-      std::string(FileName), std::string(), std::string());
-    // Read dependencies from this source
-    {
-      JobMocT& jobMoc = static_cast<JobMocT&>(*jobHandle);
-      Gen()->Moc().FindDependencies(meta.Content, jobMoc.Depends);
-      jobMoc.DependsValid = true;
+  std::string testPath;
+  testPath.reserve(basePath.size() + 8);
+  for (std::string const& ext : BaseConst().HeaderExtensions) {
+    testPath.clear();
+    testPath += basePath;
+    testPath += '.';
+    testPath += ext;
+    cmFileTime fileTime;
+    if (fileTime.Load(testPath)) {
+      // Compute real path of the file
+      testPath = cmSystemTools::GetRealPath(testPath);
+      // Return a known file if it exists already
+      {
+        auto it = BaseEval().Headers.find(testPath);
+        if (it != BaseEval().Headers.end()) {
+          return it->second;
+        }
+      }
+      // Created and return discovered file entry
+      SourceFileHandleT& res = MocEval().HeadersDiscovered[testPath];
+      if (!res) {
+        res = std::make_shared<SourceFileT>(testPath);
+        res->FileTime = fileTime;
+        res->Moc = true;
+      }
+      return res;
     }
-    success = Gen()->ParallelJobPushMoc(std::move(jobHandle));
   }
-  return success;
+  // Return without success
+  return SourceFileHandleT();
 }
 
-std::string cmQtAutoMocUic::JobParseT::MocStringHeaders(
+std::string cmQtAutoMocUic::JobEvaluateT::MocMessageTestHeaders(
   std::string const& fileBase) const
 {
-  std::string res = fileBase;
-  res += ".{";
-  res += cmJoin(Gen()->Base().HeaderExtensions, ",");
-  res += "}";
-  return res;
+  std::ostringstream res;
+  {
+    std::string exts = ".{";
+    exts += cmJoin(BaseConst().HeaderExtensions, ",");
+    exts += '}';
+    // Compose result string
+    res << "  " << fileBase << exts << '\n';
+    for (std::string const& path : MocConst().IncludePaths) {
+      res << "  " << path << '/' << fileBase << exts << '\n';
+    }
+  }
+  return res.str();
 }
 
-std::string cmQtAutoMocUic::JobParseT::MocFindIncludedHeader(
-  std::string const& includerDir, std::string const& includeBase)
+bool cmQtAutoMocUic::JobEvaluateT::MocRegisterIncluded(
+  std::string const& includeString, SourceFileHandleT includerFileHandle,
+  SourceFileHandleT sourceFileHandle, bool sourceIsHeader) const
 {
-  std::string header;
-  // Search in vicinity of the source
-  if (!Gen()->Base().FindHeader(header, includerDir + includeBase)) {
-    // Search in include directories
-    for (std::string const& path : Gen()->Moc().IncludePaths) {
-      std::string fullPath = path;
-      fullPath.push_back('/');
-      fullPath += includeBase;
-      if (Gen()->Base().FindHeader(header, fullPath)) {
-        break;
+  // Check if this file is already included
+  MappingHandleT& handle = MocEval().Includes[includeString];
+  if (handle) {
+    // Check if the output file would be generated from different source files
+    if (handle->SourceFile != sourceFileHandle) {
+      std::string msg = "The source files\n  ";
+      msg += Quoted(includerFileHandle->FileName);
+      msg += '\n';
+      for (auto const& item : handle->IncluderFiles) {
+        msg += "  ";
+        msg += Quoted(item->FileName);
+        msg += '\n';
       }
+      msg += "contain the same include string ";
+      msg += Quoted(includeString);
+      msg += ", but\nthe moc file would be generated from different "
+             "source files\n  ";
+      msg += Quoted(sourceFileHandle->FileName);
+      msg += " and\n  ";
+      msg += Quoted(handle->SourceFile->FileName);
+      msg += ".\nConsider to\n"
+             "  - not include the \"moc_<NAME>.cpp\" file\n"
+             "  - add a directory prefix to a \"<NAME>.moc\" include "
+             "(e.g \"sub/<NAME>.moc\")\n"
+             "  - rename the source file(s)\n";
+      LogError(GenT::MOC, msg);
+      return false;
     }
+
+    // The same mapping already exists. Just add to the includers list.
+    handle->IncluderFiles.emplace_back(std::move(includerFileHandle));
+    return true;
   }
-  // Sanitize
-  if (!header.empty()) {
-    header = FileSys().GetRealPath(header);
+
+  // Create a new mapping
+  handle = std::make_shared<MappingT>();
+  handle->IncludeString = includeString;
+  handle->IncluderFiles.emplace_back(std::move(includerFileHandle));
+  handle->SourceFile = std::move(sourceFileHandle);
+  handle->OutputFile += Gen()->AbsoluteIncludePath(includeString);
+
+  // Register mapping in sources/headers map
+  MocRegisterMapping(handle, sourceIsHeader);
+  return true;
+}
+
+void cmQtAutoMocUic::JobEvaluateT::MocRegisterMapping(
+  MappingHandleT mappingHandle, bool sourceIsHeader) const
+{
+  auto& regMap =
+    sourceIsHeader ? MocEval().HeaderMappings : MocEval().SourceMappings;
+  // Check if source file already gets mapped
+  auto& regHandle = regMap[mappingHandle->SourceFile->FileName];
+  if (!regHandle) {
+    // Yet unknown mapping
+    regHandle = std::move(mappingHandle);
+  } else {
+    // Mappings with include string override those without
+    if (!mappingHandle->IncludeString.empty()) {
+      regHandle = std::move(mappingHandle);
+    }
   }
-  return header;
 }
 
-bool cmQtAutoMocUic::JobParseT::ParseUic(MetaT const& meta)
+bool cmQtAutoMocUic::JobEvaluateT::UicEval(SourceFileMapT const& fileMap)
 {
-  bool success = true;
-  if (meta.Content.find("ui_") != std::string::npos) {
-    const char* contentChars = meta.Content.c_str();
-    cmsys::RegularExpressionMatch match;
-    while (Gen()->Uic().RegExpInclude.find(contentChars, match)) {
-      if (!ParseUicInclude(meta, match.match(2))) {
-        success = false;
-        break;
-      }
-      contentChars += match.end();
+  for (auto const& pair : fileMap) {
+    if (!UicEvalFile(pair.second)) {
+      return false;
     }
   }
-  return success;
+  return true;
 }
 
-bool cmQtAutoMocUic::JobParseT::ParseUicInclude(MetaT const& meta,
-                                                std::string&& includeString)
+bool cmQtAutoMocUic::JobEvaluateT::UicEvalFile(
+  SourceFileHandleT sourceFileHandle)
 {
-  bool success = false;
-  std::string uiInputFile = UicFindIncludedFile(meta, includeString);
-  if (!uiInputFile.empty()) {
-    if (!Gen()->Uic().skipped(uiInputFile)) {
-      cmWorkerPool::JobHandleT jobHandle = cm::make_unique<JobUicT>(
-        std::move(uiInputFile), FileName, std::move(includeString));
-      success = Gen()->ParallelJobPushUic(std::move(jobHandle));
-    } else {
-      // A skipped file is successful
-      success = true;
+  SourceFileT const& sourceFile = *sourceFileHandle;
+  auto const& Include = sourceFile.ParseData->Uic.Include;
+  if (!sourceFile.Uic || Include.empty()) {
+    return true;
+  }
+
+  std::string const sourceDir = SubDirPrefix(sourceFile.FileName);
+  for (IncludeKeyT const& incKey : Include) {
+    // Find .ui file name
+    SourceFileHandleT uiFileHandle =
+      UicFindIncludedUi(sourceFile.FileName, sourceDir, incKey);
+    if (!uiFileHandle || UicConst().skipped(uiFileHandle->FileName)) {
+      continue;
+    }
+    // Register mapping
+    if (!UicRegisterMapping(incKey.Key, std::move(uiFileHandle),
+                            std::move(sourceFileHandle))) {
+      return false;
     }
   }
-  return success;
+
+  return true;
 }
 
-std::string cmQtAutoMocUic::JobParseT::UicFindIncludedFile(
-  MetaT const& meta, std::string const& includeString)
+bool cmQtAutoMocUic::JobEvaluateT::UicRegisterMapping(
+  std::string const& includeString, SourceFileHandleT uiFileHandle,
+  SourceFileHandleT includerFileHandle)
 {
-  std::string res;
-  std::string searchFile =
-    FileSys().GetFilenameWithoutLastExtension(includeString).substr(3);
-  searchFile += ".ui";
+  auto& Includes = Gen()->UicEval().Includes;
+  auto it = Includes.find(includeString);
+  if (it != Includes.end()) {
+    MappingHandleT const& handle = it->second;
+    if (handle->SourceFile != uiFileHandle) {
+      // The output file already gets generated - from a different .ui file!
+      std::string msg = "The source files\n  ";
+      msg += Quoted(includerFileHandle->FileName);
+      msg += '\n';
+      for (auto const& item : handle->IncluderFiles) {
+        msg += "  ";
+        msg += Quoted(item->FileName);
+        msg += '\n';
+      }
+      msg += "contain the same include string ";
+      msg += Quoted(includeString);
+      msg += ", but\nthe uic file would be generated from different "
+             "user interface files\n  ";
+      msg += Quoted(uiFileHandle->FileName);
+      msg += " and\n  ";
+      msg += Quoted(handle->SourceFile->FileName);
+      msg += ".\nConsider to\n"
+             "  - add a directory prefix to a \"ui_<NAME>.h\" include "
+             "(e.g \"sub/ui_<NAME>.h\")\n"
+             "  - rename the <NAME>.ui file(s) and adjust the \"ui_<NAME>.h\" "
+             "include(s)\n";
+      LogError(GenT::UIC, msg);
+      return false;
+    }
+    // Add includer file to existing mapping
+    handle->IncluderFiles.emplace_back(std::move(includerFileHandle));
+  } else {
+    // New mapping handle
+    MappingHandleT handle = std::make_shared<MappingT>();
+    handle->IncludeString = includeString;
+    handle->IncluderFiles.emplace_back(std::move(includerFileHandle));
+    handle->SourceFile = std::move(uiFileHandle);
+    handle->OutputFile += Gen()->AbsoluteIncludePath(includeString);
+    // Register mapping
+    Includes.emplace(includeString, std::move(handle));
+  }
+  return true;
+}
+
+cmQtAutoMocUic::SourceFileHandleT
+cmQtAutoMocUic::JobEvaluateT::UicFindIncludedUi(
+  std::string const& sourceFile, std::string const& sourceDir,
+  IncludeKeyT const& incKey) const
+{
+  std::string searchFileName = incKey.Base;
+  searchFileName += ".ui";
   // Collect search paths list
-  std::deque<std::string> testFiles;
+  std::vector<std::string> testFiles;
   {
-    std::string const searchPath = FileSys().SubDirPrefix(includeString);
+    auto& searchPaths = UicConst().SearchPaths;
+    testFiles.reserve((searchPaths.size() + 1) * 2);
 
-    std::string searchFileFull;
-    if (!searchPath.empty()) {
-      searchFileFull = searchPath;
-      searchFileFull += searchFile;
-    }
     // Vicinity of the source
-    {
-      std::string const sourcePath = meta.FileDir;
-      testFiles.push_back(sourcePath + searchFile);
-      if (!searchPath.empty()) {
-        testFiles.push_back(sourcePath + searchFileFull);
-      }
+    testFiles.emplace_back(sourceDir + searchFileName);
+    if (!incKey.Dir.empty()) {
+      std::string path = sourceDir;
+      path += incKey.Dir;
+      path += searchFileName;
+      testFiles.emplace_back(path);
     }
     // AUTOUIC search paths
-    if (!Gen()->Uic().SearchPaths.empty()) {
-      for (std::string const& sPath : Gen()->Uic().SearchPaths) {
-        testFiles.push_back((sPath + "/").append(searchFile));
+    if (!searchPaths.empty()) {
+      for (std::string const& sPath : searchPaths) {
+        std::string path = sPath;
+        path += '/';
+        path += searchFileName;
+        testFiles.emplace_back(std::move(path));
       }
-      if (!searchPath.empty()) {
-        for (std::string const& sPath : Gen()->Uic().SearchPaths) {
-          testFiles.push_back((sPath + "/").append(searchFileFull));
+      if (!incKey.Dir.empty()) {
+        for (std::string const& sPath : searchPaths) {
+          std::string path = sPath;
+          path += '/';
+          path += incKey.Dir;
+          path += searchFileName;
+          testFiles.emplace_back(std::move(path));
         }
       }
     }
@@ -675,243 +1100,189 @@ std::string cmQtAutoMocUic::JobParseT::UicFindIncludedFile(
 
   // Search for the .ui file!
   for (std::string const& testFile : testFiles) {
-    if (FileSys().FileExists(testFile)) {
-      res = FileSys().GetRealPath(testFile);
-      break;
+    cmFileTime fileTime;
+    if (fileTime.Load(testFile)) {
+      // .ui file found in files system!
+      std::string realPath = cmSystemTools::GetRealPath(testFile);
+      // Get or create .ui file handle
+      SourceFileHandleT& handle = Gen()->UicEval().UiFiles[realPath];
+      if (!handle) {
+        // The file wasn't registered, yet
+        handle = std::make_shared<SourceFileT>(realPath);
+        handle->FileTime = fileTime;
+      }
+      return handle;
     }
   }
 
   // Log error
-  if (res.empty()) {
-    std::string emsg = "Could not find ";
-    emsg += Quoted(searchFile);
-    emsg += " in\n";
+  {
+    std::string msg = "The file includes the uic file ";
+    msg += Quoted(incKey.Key);
+    msg += ",\nbut the user interface file ";
+    msg += Quoted(searchFileName);
+    msg += "\ncould not be found in the following locations\n";
     for (std::string const& testFile : testFiles) {
-      emsg += "  ";
-      emsg += Quoted(testFile);
-      emsg += "\n";
+      msg += "  ";
+      msg += Quoted(testFile);
+      msg += '\n';
     }
-    LogFileError(GenT::UIC, FileName, emsg);
+    LogFileError(GenT::UIC, sourceFile, msg);
   }
 
-  return res;
+  return SourceFileHandleT();
 }
 
-void cmQtAutoMocUic::JobPostParseT::Process()
+void cmQtAutoMocUic::JobGenerateT::Process()
 {
-  if (Gen()->Moc().Enabled) {
-    // Add mocs compilations fence job
+  // Add moc compile jobs
+  if (MocConst().Enabled) {
+    for (auto const& pair : MocEval().HeaderMappings) {
+      // Register if this mapping is a candidate for mocs_compilation.cpp
+      bool const compFile = pair.second->IncludeString.empty();
+      if (compFile) {
+        MocEval().CompFiles.emplace_back(pair.second->SourceFile->BuildPath);
+      }
+      if (!MocGenerate(pair.second, compFile)) {
+        return;
+      }
+    }
+    for (auto const& pair : MocEval().SourceMappings) {
+      if (!MocGenerate(pair.second, false)) {
+        return;
+      }
+    }
+
+    // Add mocs compilations job on demand
     Gen()->WorkerPool().EmplaceJob<JobMocsCompilationT>();
   }
+
+  // Add uic compile jobs
+  if (UicConst().Enabled) {
+    for (auto const& pair : Gen()->UicEval().Includes) {
+      if (!UicGenerate(pair.second)) {
+        return;
+      }
+    }
+  }
+
   // Add finish job
   Gen()->WorkerPool().EmplaceJob<JobFinishT>();
 }
 
-void cmQtAutoMocUic::JobMocsCompilationT::Process()
+bool cmQtAutoMocUic::JobGenerateT::MocGenerate(MappingHandleT const& mapping,
+                                               bool compFile) const
 {
-  // Compose mocs compilation file content
-  std::string content =
-    "// This file is autogenerated. Changes will be overwritten.\n";
-  if (Gen()->MocAutoFiles().empty()) {
-    // Placeholder content
-    content += "// No files found that require moc or the moc files are "
-               "included\n";
-    content += "enum some_compilers { need_more_than_nothing };\n";
-  } else {
-    // Valid content
-    char const sbeg = Gen()->Base().MultiConfig ? '<' : '"';
-    char const send = Gen()->Base().MultiConfig ? '>' : '"';
-    for (std::string const& mocfile : Gen()->MocAutoFiles()) {
-      content += "#include ";
-      content += sbeg;
-      content += mocfile;
-      content += send;
-      content += '\n';
-    }
+  std::unique_ptr<std::string> reason;
+  if (Log().Verbose()) {
+    reason = cm::make_unique<std::string>();
   }
-
-  std::string const& compAbs = Gen()->Moc().CompFileAbs;
-  if (FileSys().FileDiffers(compAbs, content)) {
-    // Actually write mocs compilation file
-    if (Log().Verbose()) {
-      Log().Info(GenT::MOC, "Generating MOC compilation " + compAbs);
-    }
-    if (!FileSys().FileWrite(compAbs, content)) {
-      LogFileError(GenT::MOC, compAbs,
-                   "mocs compilation file writing failed.");
+  if (MocUpdate(*mapping, reason.get())) {
+    // Create the parent directory
+    if (!MakeParentDirectory(mapping->OutputFile)) {
+      LogFileError(GenT::MOC, mapping->OutputFile,
+                   "Could not create parent directory.");
+      return false;
     }
-  } else if (Gen()->MocAutoFileUpdated()) {
-    // Only touch mocs compilation file
-    if (Log().Verbose()) {
-      Log().Info(GenT::MOC, "Touching mocs compilation " + compAbs);
+    // Add moc job
+    Gen()->WorkerPool().EmplaceJob<JobMocT>(mapping, std::move(reason));
+    // Check if a moc job for a mocs_compilation.cpp entry was generated
+    if (compFile) {
+      MocEval().CompUpdated = true;
     }
-    FileSys().Touch(compAbs);
   }
+  return true;
 }
 
-void cmQtAutoMocUic::JobMocT::FindDependencies(std::string const& content)
-{
-  Gen()->Moc().FindDependencies(content, Depends);
-  DependsValid = true;
-}
-
-void cmQtAutoMocUic::JobMocT::Process()
+bool cmQtAutoMocUic::JobGenerateT::MocUpdate(MappingT const& mapping,
+                                             std::string* reason) const
 {
-  // Compute build file name
-  if (!IncludeString.empty()) {
-    BuildFile = Gen()->Base().AutogenIncludeDir;
-    BuildFile += '/';
-    BuildFile += IncludeString;
-  } else {
-    // Relative build path
-    std::string relPath = FileSys().GetFilePathChecksum(SourceFile);
-    relPath += "/moc_";
-    relPath += FileSys().GetFilenameWithoutLastExtension(SourceFile);
-
-    // Register relative file path with duplication check
-    relPath = Gen()->ParallelMocAutoRegister(relPath);
-
-    // Absolute build path
-    if (Gen()->Base().MultiConfig) {
-      BuildFile = Gen()->Base().AutogenIncludeDir;
-      BuildFile += '/';
-      BuildFile += relPath;
-    } else {
-      BuildFile = Gen()->Base().AbsoluteBuildPath(relPath);
+  std::string const& sourceFile = mapping.SourceFile->FileName;
+  std::string const& outputFile = mapping.OutputFile;
+
+  // Test if the output file exists
+  cmFileTime outputFileTime;
+  if (!outputFileTime.Load(outputFile)) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += ", because it doesn't exist, from ";
+      *reason += Quoted(sourceFile);
     }
+    return true;
   }
 
-  if (UpdateRequired()) {
-    GenerateMoc();
-  }
-}
-
-bool cmQtAutoMocUic::JobMocT::UpdateRequired()
-{
-  bool const verbose = Log().Verbose();
-
-  // Test if the build file exists
-  if (!FileSys().FileExists(BuildFile)) {
-    if (verbose) {
-      std::string reason = "Generating ";
-      reason += Quoted(BuildFile);
-      reason += " from its source file ";
-      reason += Quoted(SourceFile);
-      reason += " because it doesn't exist";
-      Log().Info(GenT::MOC, reason);
+  // Test if any setting changed
+  if (MocConst().SettingsChanged) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += ", because the uic settings changed, from ";
+      *reason += Quoted(sourceFile);
     }
     return true;
   }
 
-  // Test if any setting changed
-  if (Gen()->Moc().SettingsChanged) {
-    if (verbose) {
-      std::string reason = "Generating ";
-      reason += Quoted(BuildFile);
-      reason += " from ";
-      reason += Quoted(SourceFile);
-      reason += " because the MOC settings changed";
-      Log().Info(GenT::MOC, reason);
+  // Test if the source file is newer
+  if (outputFileTime.Older(mapping.SourceFile->FileTime)) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += ", because it's older than its source file, from ";
+      *reason += Quoted(sourceFile);
     }
     return true;
   }
 
   // Test if the moc_predefs file is newer
-  if (!Gen()->Moc().PredefsFileAbs.empty()) {
-    bool isOlder = false;
-    {
-      std::string error;
-      isOlder = FileSys().FileIsOlderThan(BuildFile,
-                                          Gen()->Moc().PredefsFileAbs, &error);
-      if (!isOlder && !error.empty()) {
-        LogError(GenT::MOC, error);
-        return false;
-      }
-    }
-    if (isOlder) {
-      if (verbose) {
-        std::string reason = "Generating ";
-        reason += Quoted(BuildFile);
-        reason += " because it's older than: ";
-        reason += Quoted(Gen()->Moc().PredefsFileAbs);
-        Log().Info(GenT::MOC, reason);
+  if (!MocConst().PredefsFileAbs.empty()) {
+    if (outputFileTime.Older(MocEval().PredefsTime)) {
+      if (reason != nullptr) {
+        *reason = "Generating ";
+        *reason += Quoted(outputFile);
+        *reason += ", because it's older than ";
+        *reason += Quoted(MocConst().PredefsFileAbs);
+        *reason += ", from ";
+        *reason += Quoted(sourceFile);
       }
       return true;
     }
   }
 
-  // Test if the source file is newer
-  {
-    bool isOlder = false;
-    {
-      std::string error;
-      isOlder = FileSys().FileIsOlderThan(BuildFile, SourceFile, &error);
-      if (!isOlder && !error.empty()) {
-        LogError(GenT::MOC, error);
-        return false;
-      }
-    }
-    if (isOlder) {
-      if (verbose) {
-        std::string reason = "Generating ";
-        reason += Quoted(BuildFile);
-        reason += " because it's older than its source file ";
-        reason += Quoted(SourceFile);
-        Log().Info(GenT::MOC, reason);
-      }
-      return true;
+  // Test if the moc executable is newer
+  if (outputFileTime.Older(MocConst().ExecutableTime)) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += ", because it's older than the moc executable, from ";
+      *reason += Quoted(sourceFile);
     }
+    return true;
   }
 
   // Test if a dependency file is newer
   {
-    // Read dependencies on demand
-    if (!DependsValid) {
-      std::string content;
-      {
-        std::string error;
-        if (!FileSys().FileRead(content, SourceFile, &error)) {
-          std::string emsg = "Could not read file\n  ";
-          emsg += Quoted(SourceFile);
-          emsg += "\nrequired by moc include ";
-          emsg += Quoted(IncludeString);
-          emsg += " in\n  ";
-          emsg += Quoted(IncluderFile);
-          emsg += ".\n";
-          emsg += error;
-          LogError(GenT::MOC, emsg);
-          return false;
-        }
-      }
-      FindDependencies(content);
-    }
     // Check dependency timestamps
-    std::string error;
-    std::string sourceDir = FileSys().SubDirPrefix(SourceFile);
-    for (std::string const& depFileRel : Depends) {
-      std::string depFileAbs =
-        Gen()->Moc().FindIncludedFile(sourceDir, depFileRel);
-      if (!depFileAbs.empty()) {
-        if (FileSys().FileIsOlderThan(BuildFile, depFileAbs, &error)) {
-          if (verbose) {
-            std::string reason = "Generating ";
-            reason += Quoted(BuildFile);
-            reason += " from ";
-            reason += Quoted(SourceFile);
-            reason += " because it is older than it's dependency file ";
-            reason += Quoted(depFileAbs);
-            Log().Info(GenT::MOC, reason);
-          }
-          return true;
-        }
-        if (!error.empty()) {
-          LogError(GenT::MOC, error);
-          return false;
+    std::string const sourceDir = SubDirPrefix(sourceFile);
+    for (std::string const& dep : mapping.SourceFile->ParseData->Moc.Depends) {
+      // Find dependency file
+      auto const depMatch = MocFindDependency(sourceDir, dep);
+      if (depMatch.first.empty()) {
+        Log().WarningFile(GenT::MOC, sourceFile,
+                          "Could not find dependency file " + Quoted(dep));
+        continue;
+      }
+      // Test if dependency file is older
+      if (outputFileTime.Older(depMatch.second)) {
+        if (reason != nullptr) {
+          *reason = "Generating ";
+          *reason += Quoted(outputFile);
+          *reason += ", because it's older than its dependency file ";
+          *reason += Quoted(depMatch.first);
+          *reason += ", from ";
+          *reason += Quoted(sourceFile);
         }
-      } else {
-        std::string message = "Could not find dependency file ";
-        message += Quoted(depFileRel);
-        Log().WarningFile(GenT::MOC, SourceFile, message);
+        return true;
       }
     }
   }
@@ -919,198 +1290,254 @@ bool cmQtAutoMocUic::JobMocT::UpdateRequired()
   return false;
 }
 
-void cmQtAutoMocUic::JobMocT::GenerateMoc()
+std::pair<std::string, cmFileTime>
+cmQtAutoMocUic::JobGenerateT::MocFindDependency(
+  std::string const& sourceDir, std::string const& includeString) const
 {
-  // Make sure the parent directory exists
-  if (!FileSys().MakeParentDirectory(BuildFile)) {
-    LogFileError(GenT::MOC, BuildFile, "Could not create parent directory.");
-    return;
-  }
+  typedef std::pair<std::string, cmFileTime> ResPair;
+  // Search in vicinity of the source
   {
-    // Compose moc command
-    std::vector<std::string> cmd;
-    cmd.push_back(Gen()->Moc().Executable);
-    // Add options
-    cmd.insert(cmd.end(), Gen()->Moc().AllOptions.begin(),
-               Gen()->Moc().AllOptions.end());
-    // Add predefs include
-    if (!Gen()->Moc().PredefsFileAbs.empty()) {
-      cmd.emplace_back("--include");
-      cmd.push_back(Gen()->Moc().PredefsFileAbs);
-    }
-    cmd.emplace_back("-o");
-    cmd.push_back(BuildFile);
-    cmd.push_back(SourceFile);
-
-    // Execute moc command
-    cmWorkerPool::ProcessResultT result;
-    if (RunProcess(GenT::MOC, result, cmd)) {
-      // Moc command success
-      // Print moc output
-      if (!result.StdOut.empty()) {
-        Log().Info(GenT::MOC, result.StdOut);
-      }
-      // Notify the generator that a not included file changed (on demand)
-      if (IncludeString.empty()) {
-        Gen()->ParallelMocAutoUpdated();
-      }
-    } else {
-      // Moc command failed
-      {
-        std::string emsg = "The moc process failed to compile\n  ";
-        emsg += Quoted(SourceFile);
-        emsg += "\ninto\n  ";
-        emsg += Quoted(BuildFile);
-        emsg += ".\n";
-        emsg += result.ErrorMessage;
-        LogCommandError(GenT::MOC, emsg, cmd, result.StdOut);
-      }
-      FileSys().FileRemove(BuildFile);
+    ResPair res{ sourceDir + includeString, {} };
+    if (res.second.Load(res.first)) {
+      return res;
+    }
+  }
+  // Search in include directories
+  for (std::string const& includePath : MocConst().IncludePaths) {
+    ResPair res{ includePath, {} };
+    res.first += '/';
+    res.first += includeString;
+    if (res.second.Load(res.first)) {
+      return res;
     }
   }
+  // Return empty
+  return ResPair();
 }
 
-void cmQtAutoMocUic::JobUicT::Process()
+bool cmQtAutoMocUic::JobGenerateT::UicGenerate(
+  MappingHandleT const& mapping) const
 {
-  // Compute build file name
-  BuildFile = Gen()->Base().AutogenIncludeDir;
-  BuildFile += '/';
-  BuildFile += IncludeString;
-
-  if (UpdateRequired()) {
-    GenerateUic();
+  std::unique_ptr<std::string> reason;
+  if (Log().Verbose()) {
+    reason = cm::make_unique<std::string>();
   }
+  if (UicUpdate(*mapping, reason.get())) {
+    // Create the parent directory
+    if (!MakeParentDirectory(mapping->OutputFile)) {
+      LogFileError(GenT::UIC, mapping->OutputFile,
+                   "Could not create parent directory.");
+      return false;
+    }
+    // Add uic job
+    Gen()->WorkerPool().EmplaceJob<JobUicT>(mapping, std::move(reason));
+  }
+  return true;
 }
 
-bool cmQtAutoMocUic::JobUicT::UpdateRequired()
+bool cmQtAutoMocUic::JobGenerateT::UicUpdate(MappingT const& mapping,
+                                             std::string* reason) const
 {
-  bool const verbose = Log().Verbose();
+  std::string const& sourceFile = mapping.SourceFile->FileName;
+  std::string const& outputFile = mapping.OutputFile;
 
   // Test if the build file exists
-  if (!FileSys().FileExists(BuildFile)) {
-    if (verbose) {
-      std::string reason = "Generating ";
-      reason += Quoted(BuildFile);
-      reason += " from its source file ";
-      reason += Quoted(SourceFile);
-      reason += " because it doesn't exist";
-      Log().Info(GenT::UIC, reason);
+  cmFileTime outputFileTime;
+  if (!outputFileTime.Load(outputFile)) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += ", because it doesn't exist, from ";
+      *reason += Quoted(sourceFile);
     }
     return true;
   }
 
   // Test if the uic settings changed
-  if (Gen()->Uic().SettingsChanged) {
-    if (verbose) {
-      std::string reason = "Generating ";
-      reason += Quoted(BuildFile);
-      reason += " from ";
-      reason += Quoted(SourceFile);
-      reason += " because the UIC settings changed";
-      Log().Info(GenT::UIC, reason);
+  if (UicConst().SettingsChanged) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += ", because the uic settings changed, from ";
+      *reason += Quoted(sourceFile);
     }
     return true;
   }
 
   // Test if the source file is newer
-  {
-    bool isOlder = false;
-    {
-      std::string error;
-      isOlder = FileSys().FileIsOlderThan(BuildFile, SourceFile, &error);
-      if (!isOlder && !error.empty()) {
-        LogError(GenT::UIC, error);
-        return false;
-      }
+  if (outputFileTime.Older(mapping.SourceFile->FileTime)) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += " because it's older than the source file ";
+      *reason += Quoted(sourceFile);
     }
-    if (isOlder) {
-      if (verbose) {
-        std::string reason = "Generating ";
-        reason += Quoted(BuildFile);
-        reason += " because it's older than its source file ";
-        reason += Quoted(SourceFile);
-        Log().Info(GenT::UIC, reason);
-      }
-      return true;
+    return true;
+  }
+
+  // Test if the uic executable is newer
+  if (outputFileTime.Older(UicConst().ExecutableTime)) {
+    if (reason != nullptr) {
+      *reason = "Generating ";
+      *reason += Quoted(outputFile);
+      *reason += ", because it's older than the uic executable, from ";
+      *reason += Quoted(sourceFile);
     }
+    return true;
   }
 
   return false;
 }
 
-void cmQtAutoMocUic::JobUicT::GenerateUic()
+void cmQtAutoMocUic::JobMocT::Process()
 {
-  // Make sure the parent directory exists
-  if (!FileSys().MakeParentDirectory(BuildFile)) {
-    LogFileError(GenT::UIC, BuildFile, "Could not create parent directory.");
-    return;
+  std::string const& sourceFile = Mapping->SourceFile->FileName;
+  std::string const& outputFile = Mapping->OutputFile;
+
+  // Compose moc command
+  std::vector<std::string> cmd;
+  cmd.push_back(MocConst().Executable);
+  // Add options
+  cmd.insert(cmd.end(), MocConst().AllOptions.begin(),
+             MocConst().AllOptions.end());
+  // Add predefs include
+  if (!MocConst().PredefsFileAbs.empty()) {
+    cmd.emplace_back("--include");
+    cmd.push_back(MocConst().PredefsFileAbs);
+  }
+  cmd.emplace_back("-o");
+  cmd.push_back(outputFile);
+  cmd.push_back(sourceFile);
+
+  // Execute moc command
+  cmWorkerPool::ProcessResultT result;
+  if (RunProcess(GenT::MOC, result, cmd, Reason.get())) {
+    // Moc command success. Print moc output.
+    if (!result.StdOut.empty()) {
+      Log().Info(GenT::MOC, result.StdOut);
+    }
+  } else {
+    // Moc command failed
+    std::string msg = "The moc process failed to compile\n  ";
+    msg += Quoted(sourceFile);
+    msg += "\ninto\n  ";
+    msg += Quoted(outputFile);
+    if (Mapping->IncluderFiles.empty()) {
+      msg += ".\n";
+    } else {
+      msg += "\nincluded by\n";
+      for (auto const& item : Mapping->IncluderFiles) {
+        msg += "  ";
+        msg += Quoted(item->FileName);
+        msg += '\n';
+      }
+    }
+    msg += result.ErrorMessage;
+    LogCommandError(GenT::MOC, msg, cmd, result.StdOut);
   }
+}
+
+void cmQtAutoMocUic::JobUicT::Process()
+{
+  std::string const& sourceFile = Mapping->SourceFile->FileName;
+  std::string const& outputFile = Mapping->OutputFile;
+
+  // Compose uic command
+  std::vector<std::string> cmd;
+  cmd.push_back(UicConst().Executable);
   {
-    // Compose uic command
-    std::vector<std::string> cmd;
-    cmd.push_back(Gen()->Uic().Executable);
-    {
-      std::vector<std::string> allOpts = Gen()->Uic().TargetOptions;
-      auto optionIt = Gen()->Uic().Options.find(SourceFile);
-      if (optionIt != Gen()->Uic().Options.end()) {
-        UicMergeOptions(allOpts, optionIt->second,
-                        (Gen()->Base().QtVersionMajor == 5));
-      }
-      cmd.insert(cmd.end(), allOpts.begin(), allOpts.end());
+    std::vector<std::string> allOpts = UicConst().TargetOptions;
+    auto optionIt = UicConst().Options.find(sourceFile);
+    if (optionIt != UicConst().Options.end()) {
+      UicMergeOptions(allOpts, optionIt->second,
+                      (BaseConst().QtVersionMajor == 5));
     }
-    cmd.emplace_back("-o");
-    cmd.emplace_back(BuildFile);
-    cmd.emplace_back(SourceFile);
+    cmd.insert(cmd.end(), allOpts.begin(), allOpts.end());
+  }
+  cmd.emplace_back("-o");
+  cmd.emplace_back(outputFile);
+  cmd.emplace_back(sourceFile);
 
-    cmWorkerPool::ProcessResultT result;
-    if (RunProcess(GenT::UIC, result, cmd)) {
-      // Uic command success
-      // Print uic output
-      if (!result.StdOut.empty()) {
-        Log().Info(GenT::UIC, result.StdOut);
-      }
-    } else {
-      // Uic command failed
-      {
-        std::string emsg = "The uic process failed to compile\n  ";
-        emsg += Quoted(SourceFile);
-        emsg += "\ninto\n  ";
-        emsg += Quoted(BuildFile);
-        emsg += "\nincluded by\n  ";
-        emsg += Quoted(IncluderFile);
-        emsg += ".\n";
-        emsg += result.ErrorMessage;
-        LogCommandError(GenT::UIC, emsg, cmd, result.StdOut);
-      }
-      FileSys().FileRemove(BuildFile);
+  cmWorkerPool::ProcessResultT result;
+  if (RunProcess(GenT::UIC, result, cmd, Reason.get())) {
+    // Uic command success
+    // Print uic output
+    if (!result.StdOut.empty()) {
+      Log().Info(GenT::UIC, result.StdOut);
     }
+  } else {
+    // Uic command failed
+    std::string msg = "The uic process failed to compile\n  ";
+    msg += Quoted(sourceFile);
+    msg += "\ninto\n  ";
+    msg += Quoted(outputFile);
+    msg += "\nincluded by\n";
+    for (auto const& item : Mapping->IncluderFiles) {
+      msg += "  ";
+      msg += Quoted(item->FileName);
+      msg += '\n';
+    }
+    msg += result.ErrorMessage;
+    LogCommandError(GenT::UIC, msg, cmd, result.StdOut);
   }
 }
 
-void cmQtAutoMocUic::JobFinishT::Process()
+void cmQtAutoMocUic::JobMocsCompilationT::Process()
 {
-  Gen()->AbortSuccess();
+  // Compose mocs compilation file content
+  std::string content =
+    "// This file is autogenerated. Changes will be overwritten.\n";
+
+  if (MocEval().CompFiles.empty()) {
+    // Placeholder content
+    content += "// No files found that require moc or the moc files are "
+               "included\n";
+    content += "enum some_compilers { need_more_than_nothing };\n";
+  } else {
+    // Valid content
+    char const clampB = BaseConst().MultiConfig ? '<' : '"';
+    char const clampE = BaseConst().MultiConfig ? '>' : '"';
+    for (std::string const& mocfile : MocEval().CompFiles) {
+      content += "#include ";
+      content += clampB;
+      content += mocfile;
+      content += clampE;
+      content += '\n';
+    }
+  }
+
+  std::string const& compAbs = MocConst().CompFileAbs;
+  if (cmQtAutoGenerator::FileDiffers(compAbs, content)) {
+    // Actually write mocs compilation file
+    if (Log().Verbose()) {
+      Log().Info(GenT::MOC, "Generating MOC compilation " + compAbs);
+    }
+    if (!FileWrite(compAbs, content)) {
+      LogFileError(GenT::MOC, compAbs,
+                   "mocs compilation file writing failed.");
+    }
+  } else if (MocEval().CompUpdated) {
+    // Only touch mocs compilation file
+    if (Log().Verbose()) {
+      Log().Info(GenT::MOC, "Touching mocs compilation " + compAbs);
+    }
+    if (!cmSystemTools::Touch(compAbs, false)) {
+      LogFileError(GenT::MOC, compAbs,
+                   "mocs compilation file touching failed.");
+    }
+  }
 }
 
-cmQtAutoMocUic::cmQtAutoMocUic()
-  : Base_(&FileSys())
-  , Moc_(&FileSys())
+void cmQtAutoMocUic::JobFinishT::Process()
 {
-  // Precompile regular expressions
-  Moc_.RegExpInclude.compile(
-    "(^|\n)[ \t]*#[ \t]*include[ \t]+"
-    "[\"<](([^ \">]+/)?moc_[^ \">/]+\\.cpp|[^ \">]+\\.moc)[\">]");
-  Uic_.RegExpInclude.compile("(^|\n)[ \t]*#[ \t]*include[ \t]+"
-                             "[\"<](([^ \">]+/)?ui_[^ \">/]+\\.h)[\">]");
+  Gen()->AbortSuccess();
 }
 
+cmQtAutoMocUic::cmQtAutoMocUic() = default;
 cmQtAutoMocUic::~cmQtAutoMocUic() = default;
 
 bool cmQtAutoMocUic::Init(cmMakefile* makefile)
 {
-  // -- Meta
-  Base_.HeaderExtensions = makefile->GetCMakeInstance()->GetHeaderExtensions();
-
   // Utility lambdas
   auto InfoGet = [makefile](const char* key) {
     return makefile->GetSafeDefinition(key);
@@ -1169,171 +1596,185 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
     cmSystemTools::ExpandListArgument(InfoGetConfig(key), list);
     return list;
   };
+  auto LogInfoError = [this](std::string const& msg) -> bool {
+    std::ostringstream err;
+    err << "In " << Quoted(this->InfoFile()) << ":\n" << msg;
+    this->Log().Error(GenT::GEN, err.str());
+    return false;
+  };
+  auto MatchSizes = [&LogInfoError](const char* keyA, const char* keyB,
+                                    std::size_t sizeA,
+                                    std::size_t sizeB) -> bool {
+    if (sizeA == sizeB) {
+      return true;
+    }
+    std::ostringstream err;
+    err << "Lists sizes mismatch " << keyA << '(' << sizeA << ") " << keyB
+        << '(' << sizeB << ')';
+    return LogInfoError(err.str());
+  };
 
   // -- Read info file
   if (!makefile->ReadListFile(InfoFile())) {
-    Log().ErrorFile(GenT::GEN, InfoFile(), "File processing failed");
-    return false;
+    return LogInfoError("File processing failed");
   }
 
   // -- Meta
-  Log().RaiseVerbosity(InfoGet("AM_VERBOSITY"));
-  Base_.MultiConfig = InfoGetBool("AM_MULTI_CONFIG");
+  Logger_.RaiseVerbosity(InfoGet("AM_VERBOSITY"));
+  BaseConst_.MultiConfig = InfoGetBool("AM_MULTI_CONFIG");
   {
-    unsigned long num = Base_.NumThreads;
+    unsigned long num = 1;
     if (cmSystemTools::StringToULong(InfoGet("AM_PARALLEL").c_str(), &num)) {
       num = std::max<unsigned long>(num, 1);
       num = std::min<unsigned long>(num, ParallelMax);
-      Base_.NumThreads = static_cast<unsigned int>(num);
     }
-    WorkerPool_.SetThreadCount(Base_.NumThreads);
+    WorkerPool_.SetThreadCount(static_cast<unsigned int>(num));
   }
+  BaseConst_.HeaderExtensions =
+    makefile->GetCMakeInstance()->GetHeaderExtensions();
 
   // - Files and directories
-  Base_.ProjectSourceDir = InfoGet("AM_CMAKE_SOURCE_DIR");
-  Base_.ProjectBinaryDir = InfoGet("AM_CMAKE_BINARY_DIR");
-  Base_.CurrentSourceDir = InfoGet("AM_CMAKE_CURRENT_SOURCE_DIR");
-  Base_.CurrentBinaryDir = InfoGet("AM_CMAKE_CURRENT_BINARY_DIR");
-  Base_.IncludeProjectDirsBefore =
+  BaseConst_.IncludeProjectDirsBefore =
     InfoGetBool("AM_CMAKE_INCLUDE_DIRECTORIES_PROJECT_BEFORE");
-  Base_.AutogenBuildDir = InfoGet("AM_BUILD_DIR");
-  if (Base_.AutogenBuildDir.empty()) {
-    Log().ErrorFile(GenT::GEN, InfoFile(), "Autogen build directory missing");
-    return false;
-  }
-  // include directory
-  Base_.AutogenIncludeDir = InfoGetConfig("AM_INCLUDE_DIR");
-  if (Base_.AutogenIncludeDir.empty()) {
-    Log().ErrorFile(GenT::GEN, InfoFile(),
-                    "Autogen include directory missing");
-    return false;
-  }
-
-  // - Files
+  BaseConst_.ProjectSourceDir = InfoGet("AM_CMAKE_SOURCE_DIR");
+  BaseConst_.ProjectBinaryDir = InfoGet("AM_CMAKE_BINARY_DIR");
+  BaseConst_.CurrentSourceDir = InfoGet("AM_CMAKE_CURRENT_SOURCE_DIR");
+  BaseConst_.CurrentBinaryDir = InfoGet("AM_CMAKE_CURRENT_BINARY_DIR");
+  BaseConst_.AutogenBuildDir = InfoGet("AM_BUILD_DIR");
+  if (BaseConst_.AutogenBuildDir.empty()) {
+    return LogInfoError("Autogen build directory missing.");
+  }
+  BaseConst_.AutogenIncludeDir = InfoGetConfig("AM_INCLUDE_DIR");
+  if (BaseConst_.AutogenIncludeDir.empty()) {
+    return LogInfoError("Autogen include directory missing.");
+  }
+  BaseConst_.CMakeExecutable = InfoGetConfig("AM_CMAKE_EXECUTABLE");
+  if (BaseConst_.CMakeExecutable.empty()) {
+    return LogInfoError("CMake executable file name missing.");
+  }
+  if (!BaseConst_.CMakeExecutableTime.Load(BaseConst_.CMakeExecutable)) {
+    std::string error = "The CMake executable ";
+    error += Quoted(BaseConst_.CMakeExecutable);
+    error += " does not exist.";
+    return LogInfoError(error);
+  }
+  BaseConst_.ParseCacheFile = InfoGetConfig("AM_PARSE_CACHE_FILE");
+  if (BaseConst_.ParseCacheFile.empty()) {
+    return LogInfoError("Parse cache file name missing.");
+  }
+
+  // - Settings file
   SettingsFile_ = InfoGetConfig("AM_SETTINGS_FILE");
   if (SettingsFile_.empty()) {
-    Log().ErrorFile(GenT::GEN, InfoFile(), "Settings file name missing");
-    return false;
+    return LogInfoError("Settings file name missing.");
   }
 
   // - Qt environment
   {
-    unsigned long qtv = Base_.QtVersionMajor;
+    unsigned long qtv = BaseConst_.QtVersionMajor;
     if (cmSystemTools::StringToULong(InfoGet("AM_QT_VERSION_MAJOR").c_str(),
                                      &qtv)) {
-      Base_.QtVersionMajor = static_cast<unsigned int>(qtv);
+      BaseConst_.QtVersionMajor = static_cast<unsigned int>(qtv);
     }
   }
 
   // - Moc
-  Moc_.Executable = InfoGet("AM_QT_MOC_EXECUTABLE");
-  Moc_.Enabled = !Moc().Executable.empty();
-  if (Moc().Enabled) {
+  MocConst_.Executable = InfoGet("AM_QT_MOC_EXECUTABLE");
+  if (!MocConst().Executable.empty()) {
+    MocConst_.Enabled = true;
+    // Load the executable file time
+    if (!MocConst_.ExecutableTime.Load(MocConst_.Executable)) {
+      std::string error = "The moc executable ";
+      error += Quoted(MocConst_.Executable);
+      error += " does not exist.";
+      return LogInfoError(error);
+    }
     for (std::string& sfl : InfoGetList("AM_MOC_SKIP")) {
-      Moc_.SkipList.insert(std::move(sfl));
+      MocConst_.SkipList.insert(std::move(sfl));
     }
-    Moc_.Definitions = InfoGetConfigList("AM_MOC_DEFINITIONS");
-    Moc_.IncludePaths = InfoGetConfigList("AM_MOC_INCLUDES");
-    Moc_.Options = InfoGetList("AM_MOC_OPTIONS");
-    Moc_.RelaxedMode = InfoGetBool("AM_MOC_RELAXED_MODE");
+    MocConst_.Definitions = InfoGetConfigList("AM_MOC_DEFINITIONS");
+    MocConst_.IncludePaths = InfoGetConfigList("AM_MOC_INCLUDES");
+    MocConst_.Options = InfoGetList("AM_MOC_OPTIONS");
+    MocConst_.RelaxedMode = InfoGetBool("AM_MOC_RELAXED_MODE");
     for (std::string const& item : InfoGetList("AM_MOC_MACRO_NAMES")) {
-      Moc_.MacroFilters.emplace_back(
+      MocConst_.MacroFilters.emplace_back(
         item, ("[\n][ \t]*{?[ \t]*" + item).append("[^a-zA-Z0-9_]"));
     }
     {
-      auto pushFilter = [this](std::string const& key, std::string const& exp,
-                               std::string& error) {
-        if (!key.empty()) {
-          if (!exp.empty()) {
-            Moc_.DependFilters.emplace_back();
-            KeyExpT& filter(Moc_.DependFilters.back());
-            if (filter.Exp.compile(exp)) {
-              filter.Key = key;
-            } else {
-              error = "Regular expression compiling failed";
-            }
-          } else {
-            error = "Regular expression is empty";
-          }
-        } else {
-          error = "Key is empty";
+      auto addFilter = [this, &LogInfoError](std::string const& key,
+                                             std::string const& exp) -> bool {
+        auto filterErr = [&LogInfoError, &key, &exp](const char* err) -> bool {
+          std::ostringstream ferr;
+          ferr << "AUTOMOC_DEPEND_FILTERS: " << err << '\n';
+          ferr << "  Key: " << Quoted(key) << '\n';
+          ferr << "  Exp: " << Quoted(exp) << '\n';
+          return LogInfoError(ferr.str());
+        };
+        if (key.empty()) {
+          return filterErr("Key is empty");
+        }
+        if (exp.empty()) {
+          return filterErr("Regular expression is empty");
         }
-        if (!error.empty()) {
-          error = ("AUTOMOC_DEPEND_FILTERS: " + error);
-          error += "\n";
-          error += "  Key: ";
-          error += Quoted(key);
-          error += "\n";
-          error += "  Exp: ";
-          error += Quoted(exp);
-          error += "\n";
+        this->MocConst_.DependFilters.emplace_back(key, exp);
+        if (!this->MocConst_.DependFilters.back().Exp.is_valid()) {
+          return filterErr("Regular expression compiling failed");
         }
+        return true;
       };
 
-      std::string error;
       // Insert default filter for Q_PLUGIN_METADATA
-      if (Base().QtVersionMajor != 4) {
-        pushFilter("Q_PLUGIN_METADATA",
-                   "[\n][ \t]*Q_PLUGIN_METADATA[ \t]*\\("
-                   "[^\\)]*FILE[ \t]*\"([^\"]+)\"",
-                   error);
+      if (BaseConst().QtVersionMajor != 4) {
+        if (!addFilter("Q_PLUGIN_METADATA",
+                       "[\n][ \t]*Q_PLUGIN_METADATA[ \t]*\\("
+                       "[^\\)]*FILE[ \t]*\"([^\"]+)\"")) {
+          return false;
+        }
       }
       // Insert user defined dependency filters
-      {
-        std::vector<std::string> flts = InfoGetList("AM_MOC_DEPEND_FILTERS");
-        if ((flts.size() % 2) == 0) {
-          for (std::vector<std::string>::iterator itC = flts.begin(),
-                                                  itE = flts.end();
-               itC != itE; itC += 2) {
-            pushFilter(*itC, *(itC + 1), error);
-            if (!error.empty()) {
-              break;
-            }
-          }
-        } else {
-          Log().ErrorFile(
-            GenT::MOC, InfoFile(),
-            "AUTOMOC_DEPEND_FILTERS list size is not a multiple of 2");
+      std::vector<std::string> flts = InfoGetList("AM_MOC_DEPEND_FILTERS");
+      if ((flts.size() % 2) != 0) {
+        return LogInfoError(
+          "AUTOMOC_DEPEND_FILTERS list size is not a multiple of 2");
+      }
+      for (auto itC = flts.begin(), itE = flts.end(); itC != itE; itC += 2) {
+        if (!addFilter(*itC, *(itC + 1))) {
           return false;
         }
       }
-      if (!error.empty()) {
-        Log().ErrorFile(GenT::MOC, InfoFile(), error);
-        return false;
-      }
-    }
-    Moc_.PredefsCmd = InfoGetList("AM_MOC_PREDEFS_CMD");
-    // Install moc predefs job
-    if (!Moc().PredefsCmd.empty()) {
-      WorkerPool().EmplaceJob<JobMocPredefsT>();
     }
+    MocConst_.PredefsCmd = InfoGetList("AM_MOC_PREDEFS_CMD");
   }
 
   // - Uic
-  Uic_.Executable = InfoGet("AM_QT_UIC_EXECUTABLE");
-  Uic_.Enabled = !Uic().Executable.empty();
-  if (Uic().Enabled) {
+  UicConst_.Executable = InfoGet("AM_QT_UIC_EXECUTABLE");
+  if (!UicConst().Executable.empty()) {
+    UicConst_.Enabled = true;
+    // Load the executable file time
+    if (!UicConst_.ExecutableTime.Load(UicConst_.Executable)) {
+      std::string error = "The uic executable ";
+      error += Quoted(UicConst_.Executable);
+      error += " does not exist.";
+      return LogInfoError(error);
+    }
     for (std::string& sfl : InfoGetList("AM_UIC_SKIP")) {
-      Uic_.SkipList.insert(std::move(sfl));
+      UicConst_.SkipList.insert(std::move(sfl));
     }
-    Uic_.SearchPaths = InfoGetList("AM_UIC_SEARCH_PATHS");
-    Uic_.TargetOptions = InfoGetConfigList("AM_UIC_TARGET_OPTIONS");
+    UicConst_.SearchPaths = InfoGetList("AM_UIC_SEARCH_PATHS");
+    UicConst_.TargetOptions = InfoGetConfigList("AM_UIC_TARGET_OPTIONS");
     {
-      auto sources = InfoGetList("AM_UIC_OPTIONS_FILES");
-      auto options = InfoGetLists("AM_UIC_OPTIONS_OPTIONS");
-      // Compare list sizes
-      if (sources.size() != options.size()) {
-        std::ostringstream ost;
-        ost << "files/options lists sizes mismatch (" << sources.size() << "/"
-            << options.size() << ")";
-        Log().ErrorFile(GenT::UIC, InfoFile(), ost.str());
+      const char* keyFiles = "AM_UIC_OPTIONS_FILES";
+      const char* keyOpts = "AM_UIC_OPTIONS_OPTIONS";
+      auto sources = InfoGetList(keyFiles);
+      auto options = InfoGetLists(keyOpts);
+      if (!MatchSizes(keyFiles, keyOpts, sources.size(), options.size())) {
         return false;
       }
       auto fitEnd = sources.cend();
       auto fit = sources.begin();
       auto oit = options.begin();
       while (fit != fitEnd) {
-        Uic_.Options[*fit] = std::move(*oit);
+        UicConst_.Options[*fit] = std::move(*oit);
         ++fit;
         ++oit;
       }
@@ -1341,92 +1782,121 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
   }
 
   // - Headers and sources
-  // Add sources
   {
-    auto addSource = [this](std::string&& src, bool moc, bool uic) {
-      WorkerPool().EmplaceJob<JobParseT>(std::move(src), moc, uic, false);
-    };
-    for (std::string& src : InfoGetList("AM_SOURCES")) {
-      addSource(std::move(src), true, true);
-    }
-    if (Moc().Enabled) {
-      for (std::string& src : InfoGetList("AM_MOC_SOURCES")) {
-        addSource(std::move(src), true, false);
+    auto makeSource =
+      [&LogInfoError](std::string const& fileName,
+                      std::string const& fileFlags) -> SourceFileHandleT {
+      if (fileFlags.size() != 2) {
+        LogInfoError("Invalid file flags string size");
+        return SourceFileHandleT();
       }
-    }
-    if (Uic().Enabled) {
-      for (std::string& src : InfoGetList("AM_UIC_SOURCES")) {
-        addSource(std::move(src), false, true);
+      cmFileTime fileTime;
+      if (!fileTime.Load(fileName)) {
+        LogInfoError("The source file " + cmQtAutoGen::Quoted(fileName) +
+                     " does not exist.");
+        return SourceFileHandleT();
       }
-    }
-  }
-  // Add Fence job
-  WorkerPool().EmplaceJob<JobFenceT>();
-  // Add headers
-  {
-    auto addHeader = [this](std::string&& hdr, bool moc, bool uic) {
-      WorkerPool().EmplaceJob<JobParseT>(std::move(hdr), moc, uic, true);
+      SourceFileHandleT sfh = std::make_shared<SourceFileT>(fileName);
+      sfh->FileTime = fileTime;
+      sfh->Moc = (fileFlags[0] == 'M');
+      sfh->Uic = (fileFlags[1] == 'U');
+      return sfh;
     };
-    for (std::string& hdr : InfoGetList("AM_HEADERS")) {
-      addHeader(std::move(hdr), true, true);
-    }
-    if (Moc().Enabled) {
-      for (std::string& hdr : InfoGetList("AM_MOC_HEADERS")) {
-        addHeader(std::move(hdr), true, false);
+
+    // Headers
+    {
+      // Get file lists
+      const char *keyFiles = "AM_HEADERS", *keyFlags = "AM_HEADERS_FLAGS";
+      std::vector<std::string> files = InfoGetList(keyFiles);
+      std::vector<std::string> flags = InfoGetList(keyFlags);
+      std::vector<std::string> builds;
+      if (!MatchSizes(keyFiles, keyFlags, files.size(), flags.size())) {
+        return false;
+      }
+      if (MocConst().Enabled) {
+        const char* keyPaths = "AM_HEADERS_BUILD_PATHS";
+        builds = InfoGetList(keyPaths);
+        if (!MatchSizes(keyFiles, keyPaths, files.size(), builds.size())) {
+          return false;
+        }
+      }
+      // Process file lists
+      for (std::size_t ii = 0; ii != files.size(); ++ii) {
+        std::string& fileName(files[ii]);
+        SourceFileHandleT sfh = makeSource(fileName, flags[ii]);
+        if (!sfh) {
+          return false;
+        }
+        if (MocConst().Enabled) {
+          sfh->BuildPath = std::move(builds[ii]);
+          if (sfh->BuildPath.empty()) {
+            Log().ErrorFile(GenT::GEN, this->InfoFile(),
+                            "Header file build path is empty");
+            return false;
+          }
+        }
+        BaseEval().Headers.emplace(std::move(fileName), std::move(sfh));
       }
     }
-    if (Uic().Enabled) {
-      for (std::string& hdr : InfoGetList("AM_UIC_HEADERS")) {
-        addHeader(std::move(hdr), false, true);
+
+    // Sources
+    {
+      const char *keyFiles = "AM_SOURCES", *keyFlags = "AM_SOURCES_FLAGS";
+      std::vector<std::string> files = InfoGetList(keyFiles);
+      std::vector<std::string> flags = InfoGetList(keyFlags);
+      if (!MatchSizes(keyFiles, keyFlags, files.size(), flags.size())) {
+        return false;
+      }
+      // Process file lists
+      for (std::size_t ii = 0; ii != files.size(); ++ii) {
+        std::string& fileName(files[ii]);
+        SourceFileHandleT sfh = makeSource(fileName, flags[ii]);
+        if (!sfh) {
+          return false;
+        }
+        BaseEval().Sources.emplace(std::move(fileName), std::move(sfh));
       }
     }
   }
-  // Addpost parse fence job
-  WorkerPool().EmplaceJob<JobPostParseT>();
 
   // Init derived information
   // ------------------------
 
-  // Init file path checksum generator
-  FileSys().setupFilePathChecksum(
-    Base().CurrentSourceDir, Base().CurrentBinaryDir, Base().ProjectSourceDir,
-    Base().ProjectBinaryDir);
-
   // Moc variables
-  if (Moc().Enabled) {
+  if (MocConst().Enabled) {
     // Mocs compilation file
-    Moc_.CompFileAbs = Base().AbsoluteBuildPath("mocs_compilation.cpp");
+    MocConst_.CompFileAbs = AbsoluteBuildPath("mocs_compilation.cpp");
 
     // Moc predefs file
-    if (!Moc_.PredefsCmd.empty()) {
-      Moc_.PredefsFileRel = "moc_predefs";
-      if (Base_.MultiConfig) {
-        Moc_.PredefsFileRel += '_';
-        Moc_.PredefsFileRel += InfoConfig();
+    if (!MocConst_.PredefsCmd.empty()) {
+      MocConst_.PredefsFileRel = "moc_predefs";
+      if (BaseConst_.MultiConfig) {
+        MocConst_.PredefsFileRel += '_';
+        MocConst_.PredefsFileRel += InfoConfig();
       }
-      Moc_.PredefsFileRel += ".h";
-      Moc_.PredefsFileAbs = Base_.AbsoluteBuildPath(Moc().PredefsFileRel);
+      MocConst_.PredefsFileRel += ".h";
+      MocConst_.PredefsFileAbs = AbsoluteBuildPath(MocConst().PredefsFileRel);
     }
 
     // Sort include directories on demand
-    if (Base().IncludeProjectDirsBefore) {
+    if (BaseConst().IncludeProjectDirsBefore) {
       // Move strings to temporary list
       std::list<std::string> includes;
-      includes.insert(includes.end(), Moc().IncludePaths.begin(),
-                      Moc().IncludePaths.end());
-      Moc_.IncludePaths.clear();
-      Moc_.IncludePaths.reserve(includes.size());
+      includes.insert(includes.end(), MocConst().IncludePaths.begin(),
+                      MocConst().IncludePaths.end());
+      MocConst_.IncludePaths.clear();
+      MocConst_.IncludePaths.reserve(includes.size());
       // Append project directories only
       {
         std::array<std::string const*, 2> const movePaths = {
-          { &Base().ProjectBinaryDir, &Base().ProjectSourceDir }
+          { &BaseConst().ProjectBinaryDir, &BaseConst().ProjectSourceDir }
         };
         for (std::string const* ppath : movePaths) {
           std::list<std::string>::iterator it = includes.begin();
           while (it != includes.end()) {
             std::string const& path = *it;
             if (cmSystemTools::StringStartsWith(path, ppath->c_str())) {
-              Moc_.IncludePaths.push_back(path);
+              MocConst_.IncludePaths.push_back(path);
               it = includes.erase(it);
             } else {
               ++it;
@@ -1435,124 +1905,176 @@ bool cmQtAutoMocUic::Init(cmMakefile* makefile)
         }
       }
       // Append remaining directories
-      Moc_.IncludePaths.insert(Moc_.IncludePaths.end(), includes.begin(),
-                               includes.end());
+      MocConst_.IncludePaths.insert(MocConst_.IncludePaths.end(),
+                                    includes.begin(), includes.end());
     }
     // Compose moc includes list
     {
       std::set<std::string> frameworkPaths;
-      for (std::string const& path : Moc().IncludePaths) {
-        Moc_.Includes.push_back("-I" + path);
+      for (std::string const& path : MocConst().IncludePaths) {
+        MocConst_.Includes.push_back("-I" + path);
         // Extract framework path
         if (cmHasLiteralSuffix(path, ".framework/Headers")) {
           // Go up twice to get to the framework root
           std::vector<std::string> pathComponents;
-          FileSys().SplitPath(path, pathComponents);
-          std::string frameworkPath = FileSys().JoinPath(
-            pathComponents.begin(), pathComponents.end() - 2);
-          frameworkPaths.insert(frameworkPath);
+          cmSystemTools::SplitPath(path, pathComponents);
+          frameworkPaths.emplace(cmSystemTools::JoinPath(
+            pathComponents.begin(), pathComponents.end() - 2));
         }
       }
       // Append framework includes
       for (std::string const& path : frameworkPaths) {
-        Moc_.Includes.emplace_back("-F");
-        Moc_.Includes.push_back(path);
+        MocConst_.Includes.emplace_back("-F");
+        MocConst_.Includes.push_back(path);
       }
     }
     // Setup single list with all options
     {
       // Add includes
-      Moc_.AllOptions.insert(Moc_.AllOptions.end(), Moc().Includes.begin(),
-                             Moc().Includes.end());
+      MocConst_.AllOptions.insert(MocConst_.AllOptions.end(),
+                                  MocConst().Includes.begin(),
+                                  MocConst().Includes.end());
       // Add definitions
-      for (std::string const& def : Moc().Definitions) {
-        Moc_.AllOptions.push_back("-D" + def);
+      for (std::string const& def : MocConst().Definitions) {
+        MocConst_.AllOptions.push_back("-D" + def);
       }
       // Add options
-      Moc_.AllOptions.insert(Moc_.AllOptions.end(), Moc().Options.begin(),
-                             Moc().Options.end());
+      MocConst_.AllOptions.insert(MocConst_.AllOptions.end(),
+                                  MocConst().Options.begin(),
+                                  MocConst().Options.end());
     }
   }
 
   return true;
 }
 
+template <class JOBTYPE>
+void cmQtAutoMocUic::CreateParseJobs(SourceFileMapT const& sourceMap)
+{
+  cmFileTime const parseCacheTime = BaseEval().ParseCacheTime;
+  ParseCacheT& parseCache = BaseEval().ParseCache;
+  for (auto& src : sourceMap) {
+    // Get or create the file parse data reference
+    ParseCacheT::GetOrInsertT cacheEntry = parseCache.GetOrInsert(src.first);
+    src.second->ParseData = std::move(cacheEntry.first);
+    // Create a parse job if the cache file was missing or is older
+    if (cacheEntry.second || src.second->FileTime.Newer(parseCacheTime)) {
+      BaseEval().ParseCacheChanged = true;
+      WorkerPool().EmplaceJob<JOBTYPE>(src.second);
+    }
+  }
+}
+
+void cmQtAutoMocUic::InitJobs()
+{
+  // Add moc_predefs.h job
+  if (MocConst().Enabled && !MocConst().PredefsCmd.empty()) {
+    WorkerPool().EmplaceJob<JobMocPredefsT>();
+  }
+  // Add header parse jobs
+  CreateParseJobs<JobParseHeaderT>(BaseEval().Headers);
+  // Add source parse jobs
+  CreateParseJobs<JobParseSourceT>(BaseEval().Sources);
+  // Add evaluate job
+  WorkerPool().EmplaceJob<JobEvaluateT>();
+}
+
 bool cmQtAutoMocUic::Process()
 {
   SettingsFileRead();
+  ParseCacheRead();
   if (!CreateDirectories()) {
     return false;
   }
+  InitJobs();
   if (!WorkerPool_.Process(this)) {
     return false;
   }
   if (JobError_) {
     return false;
   }
-  return SettingsFileWrite();
+  if (!ParseCacheWrite()) {
+    return false;
+  }
+  if (!SettingsFileWrite()) {
+    return false;
+  }
+  return true;
 }
 
 void cmQtAutoMocUic::SettingsFileRead()
 {
   // Compose current settings strings
   {
-    cmCryptoHash crypt(cmCryptoHash::AlgoSHA256);
-    std::string const sep(" ~~~ ");
-    if (Moc_.Enabled) {
-      std::string str;
-      str += Moc().Executable;
-      str += sep;
-      str += cmJoin(Moc().AllOptions, ";");
-      str += sep;
-      str += Base().IncludeProjectDirsBefore ? "TRUE" : "FALSE";
-      str += sep;
-      str += cmJoin(Moc().PredefsCmd, ";");
-      str += sep;
-      SettingsStringMoc_ = crypt.HashString(str);
-    }
-    if (Uic().Enabled) {
-      std::string str;
-      str += Uic().Executable;
-      str += sep;
-      str += cmJoin(Uic().TargetOptions, ";");
-      for (const auto& item : Uic().Options) {
-        str += sep;
-        str += item.first;
-        str += sep;
-        str += cmJoin(item.second, ";");
-      }
-      str += sep;
-      SettingsStringUic_ = crypt.HashString(str);
+    cmCryptoHash cryptoHash(cmCryptoHash::AlgoSHA256);
+    std::string const sep(";");
+    auto cha = [&cryptoHash, &sep](std::string const& value) {
+      cryptoHash.Append(value);
+      cryptoHash.Append(sep);
+    };
+
+    if (MocConst_.Enabled) {
+      cryptoHash.Initialize();
+      cha(MocConst().Executable);
+      for (auto const& value : MocConst().AllOptions) {
+        cha(value);
+      }
+      cha(BaseConst().IncludeProjectDirsBefore ? "TRUE" : "FALSE");
+      for (auto const& value : MocConst().PredefsCmd) {
+        cha(value);
+      }
+      for (auto const& filter : MocConst().DependFilters) {
+        cha(filter.Key);
+      }
+      for (auto const& filter : MocConst().MacroFilters) {
+        cha(filter.Key);
+      }
+      SettingsStringMoc_ = cryptoHash.FinalizeHex();
+    }
+
+    if (UicConst().Enabled) {
+      cryptoHash.Initialize();
+      cha(UicConst().Executable);
+      for (auto const& value : UicConst().TargetOptions) {
+        cha(value);
+      }
+      for (const auto& item : UicConst().Options) {
+        cha(item.first);
+        for (auto const& svalue : item.second) {
+          cha(svalue);
+        }
+      }
+      SettingsStringUic_ = cryptoHash.FinalizeHex();
     }
   }
 
   // Read old settings and compare
   {
     std::string content;
-    if (FileSys().FileRead(content, SettingsFile_)) {
-      if (Moc().Enabled) {
+    if (cmQtAutoGenerator::FileRead(content, SettingsFile_)) {
+      if (MocConst().Enabled) {
         if (SettingsStringMoc_ != SettingsFind(content, "moc")) {
-          Moc_.SettingsChanged = true;
+          MocConst_.SettingsChanged = true;
         }
       }
-      if (Uic().Enabled) {
+      if (UicConst().Enabled) {
         if (SettingsStringUic_ != SettingsFind(content, "uic")) {
-          Uic_.SettingsChanged = true;
+          UicConst_.SettingsChanged = true;
         }
       }
       // In case any setting changed remove the old settings file.
       // This triggers a full rebuild on the next run if the current
       // build is aborted before writing the current settings in the end.
-      if (Moc().SettingsChanged || Uic().SettingsChanged) {
-        FileSys().FileRemove(SettingsFile_);
+      if (MocConst().SettingsChanged || UicConst().SettingsChanged) {
+        cmSystemTools::RemoveFile(SettingsFile_);
       }
     } else {
       // Settings file read failed
-      if (Moc().Enabled) {
-        Moc_.SettingsChanged = true;
+      if (MocConst().Enabled) {
+        MocConst_.SettingsChanged = true;
       }
-      if (Uic().Enabled) {
-        Uic_.SettingsChanged = true;
+      if (UicConst().Enabled) {
+        UicConst_.SettingsChanged = true;
       }
     }
   }
@@ -1561,7 +2083,7 @@ void cmQtAutoMocUic::SettingsFileRead()
 bool cmQtAutoMocUic::SettingsFileWrite()
 {
   // Only write if any setting changed
-  if (Moc().SettingsChanged || Uic().SettingsChanged) {
+  if (MocConst().SettingsChanged || UicConst().SettingsChanged) {
     if (Log().Verbose()) {
       Log().Info(GenT::GEN, "Writing settings file " + Quoted(SettingsFile_));
     }
@@ -1582,11 +2104,54 @@ bool cmQtAutoMocUic::SettingsFileWrite()
     }
     // Write settings file
     std::string error;
-    if (!FileSys().FileWrite(SettingsFile_, content, &error)) {
+    if (!cmQtAutoGenerator::FileWrite(SettingsFile_, content, &error)) {
       Log().ErrorFile(GenT::GEN, SettingsFile_,
                       "Settings file writing failed. " + error);
       // Remove old settings file to trigger a full rebuild on the next run
-      FileSys().FileRemove(SettingsFile_);
+      cmSystemTools::RemoveFile(SettingsFile_);
+      return false;
+    }
+  }
+  return true;
+}
+
+void cmQtAutoMocUic::ParseCacheRead()
+{
+  const char* reason = nullptr;
+  // Don't read the cache if it is invalid
+  if (!BaseEval().ParseCacheTime.Load(BaseConst().ParseCacheFile)) {
+    reason = "Refreshing parse cache because it doesn't exist.";
+  } else if (MocConst().SettingsChanged || UicConst().SettingsChanged) {
+    reason = "Refreshing parse cache because the settings changed.";
+  } else if (BaseEval().ParseCacheTime.Older(
+               BaseConst().CMakeExecutableTime)) {
+    reason =
+      "Refreshing parse cache because it is older than the CMake executable.";
+  }
+
+  if (reason != nullptr) {
+    // Don't read but refresh the complete parse cache
+    if (Log().Verbose()) {
+      Log().Info(GenT::GEN, reason);
+    }
+    BaseEval().ParseCacheChanged = true;
+  } else {
+    // Read parse cache
+    BaseEval().ParseCache.ReadFromFile(BaseConst().ParseCacheFile);
+  }
+}
+
+bool cmQtAutoMocUic::ParseCacheWrite()
+{
+  if (BaseEval().ParseCacheChanged) {
+    if (Log().Verbose()) {
+      Log().Info(GenT::GEN,
+                 "Writing parse cache file " +
+                   Quoted(BaseConst().ParseCacheFile));
+    }
+    if (!BaseEval().ParseCache.WriteToFile(BaseConst().ParseCacheFile)) {
+      Log().ErrorFile(GenT::GEN, BaseConst().ParseCacheFile,
+                      "Parse cache file writing failed.");
       return false;
     }
   }
@@ -1596,16 +2161,14 @@ bool cmQtAutoMocUic::SettingsFileWrite()
 bool cmQtAutoMocUic::CreateDirectories()
 {
   // Create AUTOGEN include directory
-  if (!FileSys().MakeDirectory(Base().AutogenIncludeDir)) {
-    Log().ErrorFile(GenT::GEN, Base().AutogenIncludeDir,
+  if (!cmSystemTools::MakeDirectory(BaseConst().AutogenIncludeDir)) {
+    Log().ErrorFile(GenT::GEN, BaseConst().AutogenIncludeDir,
                     "Could not create directory.");
     return false;
   }
   return true;
 }
 
-// Private method that requires cmQtAutoMocUic::JobsMutex_ to be
-// locked
 void cmQtAutoMocUic::Abort(bool error)
 {
   if (error) {
@@ -1614,132 +2177,20 @@ void cmQtAutoMocUic::Abort(bool error)
   WorkerPool_.Abort();
 }
 
-bool cmQtAutoMocUic::ParallelJobPushMoc(cmWorkerPool::JobHandleT&& jobHandle)
-{
-  JobMocT const& mocJob(static_cast<JobMocT&>(*jobHandle));
-  // Do additional tests if this is an included moc job
-  if (!mocJob.IncludeString.empty()) {
-    std::lock_guard<std::mutex> guard(MocMetaMutex_);
-    // Register included moc file
-    MocIncludedFiles_.emplace(mocJob.SourceFile);
-
-    // Check if the same moc file would be generated from a different
-    // source file.
-    auto const range = MocIncludes_.equal_range(mocJob.IncludeString);
-    for (auto it = range.first; it != range.second; ++it) {
-      if (it->second[0] == mocJob.SourceFile) {
-        // The output file already gets generated
-        return true;
-      }
-      {
-        // The output file already gets generated - from a different source
-        // file!
-        std::string error = "The two source files\n  ";
-        error += Quoted(mocJob.IncluderFile);
-        error += " and\n  ";
-        error += Quoted(it->second[1]);
-        error += "\ncontain the same moc include string ";
-        error += Quoted(mocJob.IncludeString);
-        error += "\nbut the moc file would be generated from different "
-                 "source files\n  ";
-        error += Quoted(mocJob.SourceFile);
-        error += " and\n  ";
-        error += Quoted(it->second[0]);
-        error += ".\nConsider to\n"
-                 "- not include the \"moc_<NAME>.cpp\" file\n"
-                 "- add a directory prefix to a \"<NAME>.moc\" include "
-                 "(e.g \"sub/<NAME>.moc\")\n"
-                 "- rename the source file(s)\n";
-        Log().Error(GenT::MOC, error);
-        AbortError();
-        return false;
-      }
-    }
-
-    // We're still here so register this job
-    MocIncludes_.emplace_hint(range.first, mocJob.IncludeString,
-                              std::array<std::string, 2>{
-                                { mocJob.SourceFile, mocJob.IncluderFile } });
-  }
-  return WorkerPool_.PushJob(std::move(jobHandle));
-}
-
-bool cmQtAutoMocUic::ParallelJobPushUic(cmWorkerPool::JobHandleT&& jobHandle)
-{
-  const JobUicT& uicJob(static_cast<JobUicT&>(*jobHandle));
-  {
-    std::lock_guard<std::mutex> guard(UicMetaMutex_);
-    // Check if the same uic file would be generated from a different
-    // source file.
-    auto const range = UicIncludes_.equal_range(uicJob.IncludeString);
-    for (auto it = range.first; it != range.second; ++it) {
-      if (it->second[0] == uicJob.SourceFile) {
-        // The output file already gets generated
-        return true;
-      }
-      {
-        // The output file already gets generated - from a different .ui
-        // file!
-        std::string error = "The two source files\n  ";
-        error += Quoted(uicJob.IncluderFile);
-        error += " and\n  ";
-        error += Quoted(it->second[1]);
-        error += "\ncontain the same uic include string ";
-        error += Quoted(uicJob.IncludeString);
-        error += "\nbut the uic file would be generated from different "
-                 "source files\n  ";
-        error += Quoted(uicJob.SourceFile);
-        error += " and\n  ";
-        error += Quoted(it->second[0]);
-        error +=
-          ".\nConsider to\n"
-          "- add a directory prefix to a \"ui_<NAME>.h\" include "
-          "(e.g \"sub/ui_<NAME>.h\")\n"
-          "- rename the <NAME>.ui file(s) and adjust the \"ui_<NAME>.h\" "
-          "include(s)\n";
-        Log().Error(GenT::UIC, error);
-        AbortError();
-        return false;
-      }
-    }
-
-    // We're still here so register this job
-    UicIncludes_.emplace_hint(range.first, uicJob.IncludeString,
-                              std::array<std::string, 2>{
-                                { uicJob.SourceFile, uicJob.IncluderFile } });
-  }
-  return WorkerPool_.PushJob(std::move(jobHandle));
-}
-
-bool cmQtAutoMocUic::ParallelMocIncluded(std::string const& sourceFile)
+std::string cmQtAutoMocUic::AbsoluteBuildPath(
+  std::string const& relativePath) const
 {
-  std::lock_guard<std::mutex> guard(MocMetaMutex_);
-  return (MocIncludedFiles_.find(sourceFile) != MocIncludedFiles_.end());
+  std::string res(BaseConst().AutogenBuildDir);
+  res += '/';
+  res += relativePath;
+  return res;
 }
 
-std::string cmQtAutoMocUic::ParallelMocAutoRegister(
-  std::string const& baseName)
+std::string cmQtAutoMocUic::AbsoluteIncludePath(
+  std::string const& relativePath) const
 {
-  std::string res;
-  {
-    std::lock_guard<std::mutex> mocLock(MocMetaMutex_);
-    res = baseName;
-    res += ".cpp";
-    if (MocAutoFiles_.find(res) == MocAutoFiles_.end()) {
-      MocAutoFiles_.emplace(res);
-    } else {
-      // Append number suffix to the file name
-      for (unsigned int ii = 2; ii != 1024; ++ii) {
-        res = baseName;
-        res += '_';
-        res += std::to_string(ii);
-        res += ".cpp";
-        if (MocAutoFiles_.find(res) == MocAutoFiles_.end()) {
-          MocAutoFiles_.emplace(res);
-          break;
-        }
-      }
-    }
-  }
+  std::string res(BaseConst().AutogenIncludeDir);
+  res += '/';
+  res += relativePath;
   return res;
 }
diff --git a/Source/cmQtAutoMocUic.h b/Source/cmQtAutoMocUic.h
index 3902abb..8061c13 100644
--- a/Source/cmQtAutoMocUic.h
+++ b/Source/cmQtAutoMocUic.h
@@ -5,25 +5,28 @@
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
+#include "cmFileTime.h"
 #include "cmQtAutoGen.h"
 #include "cmQtAutoGenerator.h"
 #include "cmWorkerPool.h"
 #include "cmsys/RegularExpression.hxx"
 
-#include <array>
 #include <atomic>
+#include <cstddef>
 #include <map>
 #include <memory> // IWYU pragma: keep
-#include <mutex>
 #include <set>
 #include <string>
+#include <unordered_map>
 #include <unordered_set>
 #include <utility>
 #include <vector>
 
 class cmMakefile;
 
-// @brief AUTOMOC and AUTOUIC generator
+/** \class cmQtAutoMocUic
+ * \brief AUTOMOC and AUTOUIC generator
+ */
 class cmQtAutoMocUic : public cmQtAutoGenerator
 {
 public:
@@ -35,10 +38,10 @@ public:
 
 public:
   // -- Types
-  typedef std::multimap<std::string, std::array<std::string, 2>> IncludesMap;
 
-  /// @brief Search key plus regular expression pair
-  ///
+  /**
+   * Search key plus regular expression pair
+   */
   struct KeyExpT
   {
     KeyExpT() = default;
@@ -59,35 +62,123 @@ public:
     cmsys::RegularExpression Exp;
   };
 
-  /// @brief Common settings
-  ///
-  class BaseSettingsT
+  /**
+   * Include string with sub parts
+   */
+  struct IncludeKeyT
+  {
+    IncludeKeyT(std::string const& key, std::size_t basePrefixLength);
+
+    std::string Key;  // Full include string
+    std::string Dir;  // Include directory
+    std::string Base; // Base part of the include file name
+  };
+
+  /**
+   * Source file parsing cache
+   */
+  class ParseCacheT
+  {
+  public:
+    // -- Types
+    /**
+     * Entry of the file parsing cache
+     */
+    struct FileT
+    {
+      void Clear();
+
+      struct MocT
+      {
+        std::string Macro;
+        struct IncludeT
+        {
+          std::vector<IncludeKeyT> Underscore;
+          std::vector<IncludeKeyT> Dot;
+        } Include;
+        std::vector<std::string> Depends;
+      } Moc;
+
+      struct UicT
+      {
+        std::vector<IncludeKeyT> Include;
+        std::vector<std::string> Depends;
+      } Uic;
+    };
+    typedef std::shared_ptr<FileT> FileHandleT;
+    typedef std::pair<FileHandleT, bool> GetOrInsertT;
+
+  public:
+    ParseCacheT();
+    ~ParseCacheT();
+
+    void Clear();
+
+    bool ReadFromFile(std::string const& fileName);
+    bool WriteToFile(std::string const& fileName);
+
+    //! Might return an invalid handle
+    FileHandleT Get(std::string const& fileName) const;
+    //! Always returns a valid handle
+    GetOrInsertT GetOrInsert(std::string const& fileName);
+
+  private:
+    std::unordered_map<std::string, FileHandleT> Map_;
+  };
+
+  /**
+   * Source file data
+   */
+  class SourceFileT
   {
   public:
-    // -- Volatile methods
-    BaseSettingsT(FileSystem* fileSystem)
-      : MultiConfig(false)
-      , IncludeProjectDirsBefore(false)
-      , QtVersionMajor(4)
-      , NumThreads(1)
-      , FileSys(fileSystem)
+    SourceFileT(std::string fileName)
+      : FileName(std::move(fileName))
     {
     }
 
+  public:
+    std::string FileName;
+    cmFileTime FileTime;
+    ParseCacheT::FileHandleT ParseData;
+    std::string BuildPath;
+    bool Moc = false;
+    bool Uic = false;
+  };
+  typedef std::shared_ptr<SourceFileT> SourceFileHandleT;
+  typedef std::map<std::string, SourceFileHandleT> SourceFileMapT;
+
+  /**
+   * Meta compiler file mapping information
+   */
+  struct MappingT
+  {
+    SourceFileHandleT SourceFile;
+    std::string OutputFile;
+    std::string IncludeString;
+    std::vector<SourceFileHandleT> IncluderFiles;
+  };
+  typedef std::shared_ptr<MappingT> MappingHandleT;
+  typedef std::map<std::string, MappingHandleT> MappingMapT;
+
+  /**
+   * Common settings
+   */
+  class BaseSettingsT
+  {
+  public:
+    // -- Constructors
+    BaseSettingsT();
+    ~BaseSettingsT();
+
     BaseSettingsT(BaseSettingsT const&) = delete;
     BaseSettingsT& operator=(BaseSettingsT const&) = delete;
 
-    // -- Const methods
-    std::string AbsoluteBuildPath(std::string const& relativePath) const;
-    bool FindHeader(std::string& header,
-                    std::string const& testBasePath) const;
-
     // -- Attributes
     // - Config
-    bool MultiConfig;
-    bool IncludeProjectDirsBefore;
-    unsigned int QtVersionMajor;
-    unsigned int NumThreads;
+    bool MultiConfig = false;
+    bool IncludeProjectDirsBefore = false;
+    unsigned int QtVersionMajor = 4;
     // - Directories
     std::string ProjectSourceDir;
     std::string ProjectBinaryDir;
@@ -96,37 +187,50 @@ public:
     std::string AutogenBuildDir;
     std::string AutogenIncludeDir;
     // - Files
+    std::string CMakeExecutable;
+    cmFileTime CMakeExecutableTime;
+    std::string ParseCacheFile;
     std::vector<std::string> HeaderExtensions;
-    // - File system
-    FileSystem* FileSys;
   };
 
-  /// @brief Moc settings
-  ///
+  /**
+   * Shared common variables
+   */
+  class BaseEvalT
+  {
+  public:
+    // -- Parse Cache
+    bool ParseCacheChanged = false;
+    cmFileTime ParseCacheTime;
+    ParseCacheT ParseCache;
+
+    // -- Sources
+    SourceFileMapT Headers;
+    SourceFileMapT Sources;
+  };
+
+  /**
+   * Moc settings
+   */
   class MocSettingsT
   {
   public:
-    MocSettingsT(FileSystem* fileSys)
-      : FileSys(fileSys)
-    {
-    }
+    // -- Constructors
+    MocSettingsT();
+    ~MocSettingsT();
 
     MocSettingsT(MocSettingsT const&) = delete;
     MocSettingsT& operator=(MocSettingsT const&) = delete;
 
     // -- Const methods
     bool skipped(std::string const& fileName) const;
-    std::string FindMacro(std::string const& content) const;
     std::string MacrosString() const;
-    std::string FindIncludedFile(std::string const& sourcePath,
-                                 std::string const& includeString) const;
-    void FindDependencies(std::string const& content,
-                          std::set<std::string>& depends) const;
 
     // -- Attributes
     bool Enabled = false;
     bool SettingsChanged = false;
     bool RelaxedMode = false;
+    cmFileTime ExecutableTime;
     std::string Executable;
     std::string CompFileAbs;
     std::string PredefsFileRel;
@@ -141,16 +245,35 @@ public:
     std::vector<KeyExpT> DependFilters;
     std::vector<KeyExpT> MacroFilters;
     cmsys::RegularExpression RegExpInclude;
-    // - File system
-    FileSystem* FileSys;
   };
 
-  /// @brief Uic settings
-  ///
+  /**
+   * Moc shared variables
+   */
+  class MocEvalT
+  {
+  public:
+    // -- predefines file
+    cmFileTime PredefsTime;
+    // -- Mappings
+    MappingMapT HeaderMappings;
+    MappingMapT SourceMappings;
+    MappingMapT Includes;
+    // -- Discovered files
+    SourceFileMapT HeadersDiscovered;
+    // -- Mocs compilation
+    bool CompUpdated = false;
+    std::vector<std::string> CompFiles;
+  };
+
+  /**
+   * Uic settings
+   */
   class UicSettingsT
   {
   public:
-    UicSettingsT() = default;
+    UicSettingsT();
+    ~UicSettingsT();
 
     UicSettingsT(UicSettingsT const&) = delete;
     UicSettingsT& operator=(UicSettingsT const&) = delete;
@@ -161,6 +284,7 @@ public:
     // -- Attributes
     bool Enabled = false;
     bool SettingsChanged = false;
+    cmFileTime ExecutableTime;
     std::string Executable;
     std::unordered_set<std::string> SkipList;
     std::vector<std::string> TargetOptions;
@@ -169,8 +293,19 @@ public:
     cmsys::RegularExpression RegExpInclude;
   };
 
-  /// @brief Abstract job class for concurrent job processing
-  ///
+  /**
+   * Uic shared variables
+   */
+  class UicEvalT
+  {
+  public:
+    SourceFileMapT UiFiles;
+    MappingMapT Includes;
+  };
+
+  /**
+   * Abstract job class for concurrent job processing
+   */
   class JobT : public cmWorkerPool::JobT
   {
   protected:
@@ -188,10 +323,14 @@ public:
       return static_cast<cmQtAutoMocUic*>(UserData());
     };
 
-    //! Get the file system interface. Only valid during Process() call!
-    FileSystem& FileSys() { return Gen()->FileSys(); }
-    //! Get the logger. Only valid during Process() call!
-    Logger& Log() { return Gen()->Log(); }
+    // -- Accessors. Only valid during Process() call!
+    Logger const& Log() const { return Gen()->Log(); }
+    BaseSettingsT const& BaseConst() const { return Gen()->BaseConst(); }
+    BaseEvalT& BaseEval() const { return Gen()->BaseEval(); }
+    MocSettingsT const& MocConst() const { return Gen()->MocConst(); }
+    MocEvalT& MocEval() const { return Gen()->MocEval(); }
+    UicSettingsT const& UicConst() const { return Gen()->UicConst(); }
+    UicEvalT& UicEval() const { return Gen()->UicEval(); }
 
     // -- Error logging with automatic abort
     void LogError(GenT genType, std::string const& message) const;
@@ -205,11 +344,13 @@ public:
      * @brief Run an external process. Use only during Process() call!
      */
     bool RunProcess(GenT genType, cmWorkerPool::ProcessResultT& result,
-                    std::vector<std::string> const& command);
+                    std::vector<std::string> const& command,
+                    std::string* infoMessage = nullptr);
   };
 
-  /// @brief Fence job utility class
-  ///
+  /**
+   * Fence job utility class
+   */
   class JobFenceT : public JobT
   {
   public:
@@ -220,121 +361,152 @@ public:
     void Process() override{};
   };
 
-  /// @brief Generate moc_predefs.h
-  ///
-  class JobMocPredefsT : public JobT
+  /**
+   * Generate moc_predefs.h
+   */
+  class JobMocPredefsT : public JobFenceT
   {
-  private:
     void Process() override;
+    bool Update(std::string* reason) const;
   };
 
-  /// @brief Parses a source file
-  ///
+  /**
+   * File parse job base class
+   */
   class JobParseT : public JobT
   {
   public:
-    JobParseT(std::string fileName, bool moc, bool uic, bool header = false)
-      : FileName(std::move(fileName))
-      , AutoMoc(moc)
-      , AutoUic(uic)
-      , Header(header)
+    JobParseT(SourceFileHandleT fileHandle)
+      : FileHandle(std::move(fileHandle))
     {
     }
 
-  private:
-    struct MetaT
-    {
-      std::string Content;
-      std::string FileDir;
-      std::string FileBase;
-    };
+  protected:
+    bool ReadFile();
+    void CreateKeys(std::vector<IncludeKeyT>& container,
+                    std::set<std::string> const& source,
+                    std::size_t basePrefixLength);
+    void MocMacro();
+    void MocDependecies();
+    void MocIncludes();
+    void UicIncludes();
+
+  protected:
+    SourceFileHandleT FileHandle;
+    std::string Content;
+  };
 
+  /**
+   * Header file parse job
+   */
+  class JobParseHeaderT : public JobParseT
+  {
+  public:
+    using JobParseT::JobParseT;
     void Process() override;
-    bool ParseMocSource(MetaT const& meta);
-    bool ParseMocHeader(MetaT const& meta);
-    std::string MocStringHeaders(std::string const& fileBase) const;
-    std::string MocFindIncludedHeader(std::string const& includerDir,
-                                      std::string const& includeBase);
-    bool ParseUic(MetaT const& meta);
-    bool ParseUicInclude(MetaT const& meta, std::string&& includeString);
-    std::string UicFindIncludedFile(MetaT const& meta,
-                                    std::string const& includeString);
+  };
 
-  private:
-    std::string FileName;
-    bool AutoMoc = false;
-    bool AutoUic = false;
-    bool Header = false;
+  /**
+   * Source file parse job
+   */
+  class JobParseSourceT : public JobParseT
+  {
+  public:
+    using JobParseT::JobParseT;
+    void Process() override;
   };
 
-  /// @brief Generates additional jobs after all files have been parsed
-  ///
-  class JobPostParseT : public JobFenceT
+  /**
+   * Evaluate parsed files
+   */
+  class JobEvaluateT : public JobFenceT
   {
-  private:
     void Process() override;
+
+    // -- Moc
+    bool MocEvalHeader(SourceFileHandleT source);
+    bool MocEvalSource(SourceFileHandleT const& source);
+    SourceFileHandleT MocFindIncludedHeader(
+      std::string const& includerDir, std::string const& includeBase) const;
+    SourceFileHandleT MocFindHeader(std::string const& basePath) const;
+    std::string MocMessageTestHeaders(std::string const& fileBase) const;
+    bool MocRegisterIncluded(std::string const& includeString,
+                             SourceFileHandleT includerFileHandle,
+                             SourceFileHandleT sourceFileHandle,
+                             bool sourceIsHeader) const;
+    void MocRegisterMapping(MappingHandleT mappingHandle,
+                            bool sourceIsHeader) const;
+
+    // -- Uic
+    bool UicEval(SourceFileMapT const& fileMap);
+    bool UicEvalFile(SourceFileHandleT sourceFileHandle);
+    SourceFileHandleT UicFindIncludedUi(std::string const& sourceFile,
+                                        std::string const& sourceDir,
+                                        IncludeKeyT const& incKey) const;
+    bool UicRegisterMapping(std::string const& includeString,
+                            SourceFileHandleT uiFileHandle,
+                            SourceFileHandleT includerFileHandle);
   };
 
-  /// @brief Generate mocs_compilation.cpp
-  ///
-  class JobMocsCompilationT : public JobFenceT
+  /**
+   * Generates moc/uic jobs
+   */
+  class JobGenerateT : public JobFenceT
   {
-  private:
     void Process() override;
+    // -- Moc
+    bool MocGenerate(MappingHandleT const& mapping, bool compFile) const;
+    bool MocUpdate(MappingT const& mapping, std::string* reason) const;
+    std::pair<std::string, cmFileTime> MocFindDependency(
+      std::string const& sourceDir, std::string const& includeString) const;
+    // -- Uic
+    bool UicGenerate(MappingHandleT const& mapping) const;
+    bool UicUpdate(MappingT const& mapping, std::string* reason) const;
   };
 
-  /// @brief Moc a file job
-  ///
-  class JobMocT : public JobT
+  /**
+   * File compiling base job
+   */
+  class JobCompileT : public JobT
   {
   public:
-    JobMocT(std::string sourceFile, std::string includerFile,
-            std::string includeString)
-      : SourceFile(std::move(sourceFile))
-      , IncluderFile(std::move(includerFile))
-      , IncludeString(std::move(includeString))
+    JobCompileT(MappingHandleT uicMapping, std::unique_ptr<std::string> reason)
+      : Mapping(std::move(uicMapping))
+      , Reason(std::move(reason))
     {
     }
 
-    void FindDependencies(std::string const& content);
+  protected:
+    MappingHandleT Mapping;
+    std::unique_ptr<std::string> Reason;
+  };
 
-  private:
+  /**
+   * moc compiles a file
+   */
+  class JobMocT : public JobCompileT
+  {
+  public:
+    using JobCompileT::JobCompileT;
     void Process() override;
-    bool UpdateRequired();
-    void GenerateMoc();
+  };
 
+  /**
+   * uic compiles a file
+   */
+  class JobUicT : public JobCompileT
+  {
   public:
-    std::string SourceFile;
-    std::string IncluderFile;
-    std::string IncludeString;
-    std::string BuildFile;
-    bool DependsValid = false;
-    std::set<std::string> Depends;
+    using JobCompileT::JobCompileT;
+    void Process() override;
   };
 
-  /// @brief Uic a file job
+  /// @brief Generate mocs_compilation.cpp
   ///
-  class JobUicT : public JobT
+  class JobMocsCompilationT : public JobFenceT
   {
-  public:
-    JobUicT(std::string sourceFile, std::string includerFile,
-            std::string includeString)
-      : SourceFile(std::move(sourceFile))
-      , IncluderFile(std::move(includerFile))
-      , IncludeString(std::move(includeString))
-    {
-    }
-
   private:
     void Process() override;
-    bool UpdateRequired();
-    void GenerateUic();
-
-  public:
-    std::string SourceFile;
-    std::string IncluderFile;
-    std::string IncludeString;
-    std::string BuildFile;
   };
 
   /// @brief The last job
@@ -346,39 +518,37 @@ public:
   };
 
   // -- Const settings interface
-  const BaseSettingsT& Base() const { return this->Base_; }
-  const MocSettingsT& Moc() const { return this->Moc_; }
-  const UicSettingsT& Uic() const { return this->Uic_; }
+  BaseSettingsT const& BaseConst() const { return this->BaseConst_; }
+  BaseEvalT& BaseEval() { return this->BaseEval_; }
+  MocSettingsT const& MocConst() const { return this->MocConst_; }
+  MocEvalT& MocEval() { return this->MocEval_; }
+  UicSettingsT const& UicConst() const { return this->UicConst_; }
+  UicEvalT& UicEval() { return this->UicEval_; }
 
   // -- Parallel job processing interface
   cmWorkerPool& WorkerPool() { return WorkerPool_; }
   void AbortError() { Abort(true); }
   void AbortSuccess() { Abort(false); }
-  bool ParallelJobPushMoc(cmWorkerPool::JobHandleT&& jobHandle);
-  bool ParallelJobPushUic(cmWorkerPool::JobHandleT&& jobHandle);
 
-  // -- Mocs compilation include file updated flag
-  void ParallelMocAutoUpdated() { MocAutoFileUpdated_.store(true); }
-  bool MocAutoFileUpdated() const { return MocAutoFileUpdated_.load(); }
-
-  // -- Mocs compilation file register
-  std::string ParallelMocAutoRegister(std::string const& baseName);
-  bool ParallelMocIncluded(std::string const& sourceFile);
-  std::set<std::string> const& MocAutoFiles() const
-  {
-    return this->MocAutoFiles_;
-  }
+  // -- Utility
+  std::string AbsoluteBuildPath(std::string const& relativePath) const;
+  std::string AbsoluteIncludePath(std::string const& relativePath) const;
+  template <class JOBTYPE>
+  void CreateParseJobs(SourceFileMapT const& sourceMap);
 
 private:
   // -- Utility accessors
-  Logger& Log() { return Logger_; }
-  FileSystem& FileSys() { return FileSys_; }
+  Logger const& Log() const { return Logger_; }
   // -- Abstract processing interface
   bool Init(cmMakefile* makefile) override;
+  void InitJobs();
   bool Process() override;
   // -- Settings file
   void SettingsFileRead();
   bool SettingsFileWrite();
+  // -- Parse cache
+  void ParseCacheRead();
+  bool ParseCacheWrite();
   // -- Thread processing
   void Abort(bool error);
   // -- Generation
@@ -387,25 +557,18 @@ private:
 private:
   // -- Utility
   Logger Logger_;
-  FileSystem FileSys_;
   // -- Settings
-  BaseSettingsT Base_;
-  MocSettingsT Moc_;
-  UicSettingsT Uic_;
-  // -- Moc meta
-  std::mutex MocMetaMutex_;
-  std::set<std::string> MocIncludedFiles_;
-  IncludesMap MocIncludes_;
-  std::set<std::string> MocAutoFiles_;
-  std::atomic<bool> MocAutoFileUpdated_ = ATOMIC_VAR_INIT(false);
-  // -- Uic meta
-  std::mutex UicMetaMutex_;
-  IncludesMap UicIncludes_;
+  BaseSettingsT BaseConst_;
+  BaseEvalT BaseEval_;
+  MocSettingsT MocConst_;
+  MocEvalT MocEval_;
+  UicSettingsT UicConst_;
+  UicEvalT UicEval_;
   // -- Settings file
   std::string SettingsFile_;
   std::string SettingsStringMoc_;
   std::string SettingsStringUic_;
-  // -- Thread pool and job queue
+  // -- Worker thread pool
   std::atomic<bool> JobError_ = ATOMIC_VAR_INIT(false);
   cmWorkerPool WorkerPool_;
 };
diff --git a/Source/cmQtAutoRcc.cxx b/Source/cmQtAutoRcc.cxx
index e58324d..bb40c39 100644
--- a/Source/cmQtAutoRcc.cxx
+++ b/Source/cmQtAutoRcc.cxx
@@ -57,7 +57,7 @@ bool cmQtAutoRcc::Init(cmMakefile* makefile)
   }
 
   // - Configurations
-  Log().RaiseVerbosity(InfoGet("ARCC_VERBOSITY"));
+  Logger_.RaiseVerbosity(InfoGet("ARCC_VERBOSITY"));
   MultiConfig_ = makefile->IsOn("ARCC_MULTI_CONFIG");
 
   // - Directories
diff --git a/Source/cmQtAutoRcc.h b/Source/cmQtAutoRcc.h
index 8dc9179..01c3fb9 100644
--- a/Source/cmQtAutoRcc.h
+++ b/Source/cmQtAutoRcc.h
@@ -26,7 +26,7 @@ public:
 
 private:
   // -- Utility
-  Logger& Log() { return Logger_; }
+  Logger const& Log() const { return Logger_; }
   bool IsMultiConfig() const { return MultiConfig_; }
   std::string MultiConfigOutput() const;