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.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172437 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index 2ed8853bb2..81d3cea7ba 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -3413,6 +3413,9 @@ bool ASTReader::ReadSubmoduleBlock(ModuleFile &F) {
         DeserializationListener->ModuleRead(GlobalID, CurrentModule);
       
       SubmodulesLoaded[GlobalIndex] = CurrentModule;
+
+      // Clear out link libraries; the module file has them.
+      CurrentModule->LinkLibraries.clear();
       break;
     }
         
@@ -3600,6 +3603,20 @@ bool ASTReader::ReadSubmoduleBlock(ModuleFile &F) {
                                     Context.getTargetInfo());
       break;
     }
+
+    case SUBMODULE_LINK_LIBRARY:
+      if (First) {
+        Error("missing submodule metadata record at beginning of block");
+        return true;
+      }
+
+      if (!CurrentModule)
+        break;
+
+      CurrentModule->LinkLibraries.push_back(
+         Module::LinkLibrary(StringRef(BlobStart, BlobLen),
+         Record[0]));
+      break;
     }
   }
 }