commit 6e975c4517958bcc11c834336d340797356058db
author Douglas Gregor <dgregor@apple.com> Tue Sep 13 23:15:45 2011 +0000
committer Douglas Gregor <dgregor@apple.com> Tue Sep 13 23:15:45 2011 +0000
tree e3b9b3a30636d52d700d5e48004d86f24dc7f70a
parent 7ea51d5f0b4a8fc5768d1b4744a556dc756f1b3b

For modules, use a hash of the compiler version, language options, and
target triple to separate modules built under different
conditions. The hash is used to create a subdirectory in the module
cache path where other invocations of the compiler (with the same
version, language options, etc.) can find the precompiled modules.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139662 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Frontend/CompilerInstance.cpp

diff --git a/lib/Frontend/CompilerInstance.cpp b/lib/Frontend/CompilerInstance.cpp
index ece9cd8..720f7bb 100644
--- a/lib/Frontend/CompilerInstance.cpp
+++ b/lib/Frontend/CompilerInstance.cpp
@@ -221,6 +221,15 @@
   
   InitializePreprocessor(*PP, PPOpts, getHeaderSearchOpts(), getFrontendOpts());
   
+  // Set up the module path, including the hash for the
+  // module-creation options.
+  llvm::SmallString<256> SpecificModuleCache(
+                           getHeaderSearchOpts().ModuleCachePath);
+  if (!getHeaderSearchOpts().DisableModuleHash)
+    llvm::sys::path::append(SpecificModuleCache, 
+                            getInvocation().getModuleHash());
+  PP->getHeaderSearchInfo().setModuleCachePath(SpecificModuleCache);
+  
   // Handle generating dependencies, if requested.
   const DependencyOutputOptions &DepOpts = getDependencyOutputOpts();
   if (!DepOpts.OutputFile.empty())
@@ -644,13 +653,8 @@
 /// instance.
 static void compileModule(CompilerInstance &ImportingInstance,
                           StringRef ModuleName,
+                          StringRef ModuleFileName,
                           StringRef UmbrellaHeader) {
-  // Determine the file that we'll be writing to.
-  llvm::SmallString<128> ModuleFile;
-  ModuleFile += 
-    ImportingInstance.getInvocation().getHeaderSearchOpts().ModuleCachePath;
-  llvm::sys::path::append(ModuleFile, ModuleName + ".pcm");
-  
   // Construct a compiler invocation for creating this module.
   llvm::IntrusiveRefCntPtr<CompilerInvocation> Invocation
     (new CompilerInvocation(ImportingInstance.getInvocation()));
@@ -658,7 +662,7 @@
   Invocation->getPreprocessorOpts().resetNonModularOptions();
   
   FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
-  FrontendOpts.OutputFile = ModuleFile.str();
+  FrontendOpts.OutputFile = ModuleFileName.str();
   FrontendOpts.DisableFree = false;
   FrontendOpts.Inputs.clear();
   FrontendOpts.Inputs.push_back(
@@ -686,10 +690,6 @@
   // FIXME: Need to synchronize when multiple processes do this.
   Instance.ExecuteAction(CreateModuleAction);
   
-  // Tell the importing instance's file manager to forget about the module
-  // file, since we've just created it.
-  ImportingInstance.getFileManager().forgetFile(ModuleFile);
-  
   // Tell the diagnostic client that it's (re-)starting to process a source
   // file.
   ImportingInstance.getDiagnosticClient()
@@ -710,8 +710,10 @@
 
   // Search for a module with the given name.
   std::string UmbrellaHeader;
+  std::string ModuleFileName;
   const FileEntry *ModuleFile
     = PP->getHeaderSearchInfo().lookupModule(ModuleName.getName(),
+                                             &ModuleFileName,
                                              &UmbrellaHeader);
   
   bool BuildingModule = false;
@@ -720,7 +722,7 @@
     // can be used to create the module file. Create a separate compilation
     // module to do so.
     BuildingModule = true;
-    compileModule(*this, ModuleName.getName(), UmbrellaHeader);
+    compileModule(*this, ModuleName.getName(), ModuleFileName, UmbrellaHeader);
     ModuleFile = PP->getHeaderSearchInfo().lookupModule(ModuleName.getName());
   }