Implement parsing, AST, (de-)serialization, and placeholder global

metadata for linking against the libraries/frameworks for imported
modules.

The module map language is extended with a new "link" directive that
specifies what library or framework to link against when a module is
imported, e.g.,

  link "clangAST"

or

  link framework "MyFramework"

Importing the corresponding module (or any of its submodules) will
eventually link against the named library/framework.

For now, I've added some placeholder global metadata that encodes the
imported libraries/frameworks, so that we can test that this
information gets through to the IR. The format of the data is still
under discussion.

llvm-svn: 172437

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 34fa19c..0d644a7 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -23,7 +23,9 @@
 #include "clang/AST/Mangle.h"
 #include "clang/Basic/ABI.h"
 #include "clang/Basic/LangOptions.h"
+#include "clang/Basic/Module.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/IR/Module.h"
@@ -66,6 +68,7 @@ namespace clang {
   class AnnotateAttr;
   class CXXDestructorDecl;
   class MangleBuffer;
+  class Module;
 
 namespace CodeGen {
 
@@ -313,6 +316,12 @@ class CodeGenModule : public CodeGenTypeCache {
   /// run on termination.
   std::vector<std::pair<llvm::WeakVH,llvm::Constant*> > CXXGlobalDtors;
 
+  /// \brief The complete set of modules that has been imported.
+  llvm::SetVector<clang::Module *> ImportedModules;
+
+  /// \brief The set of libraries to link against.
+  std::vector<clang::Module::LinkLibrary> LinkLibraries;
+
   /// @name Cache for Objective-C runtime types
   /// @{
 
@@ -989,6 +998,9 @@ private:
   /// references to global which may otherwise be optimized out.
   void EmitLLVMUsed();
 
+  /// \brief Emit the set of libraries to link against.
+  void EmitLinkLibraries();
+
   void EmitDeclMetadata();
 
   /// EmitCoverageFile - Emit the llvm.gcov metadata used to tell LLVM where