Have the StripMetadata pass also strip unsupported named metadata.

Previously it was just instruction attachments.
Depends on a driver change to actually work:
https://codereview.chromium.org/14072004/

BUG= http://code.google.com/p/nativeclient/issues/detail?id=3348

Review URL: https://codereview.chromium.org/14022009

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/Transforms/NaCl/StripMetadata.cpp b/lib/Transforms/NaCl/StripMetadata.cpp
index a7d2e7eb68..8461e7efbe 100644
--- a/lib/Transforms/NaCl/StripMetadata.cpp
+++ b/lib/Transforms/NaCl/StripMetadata.cpp
@@ -51,6 +51,11 @@ ModulePass *llvm::createStripMetadataPass() {
   return new StripMetadata();
 }
 
+static bool IsWhitelistedMetadata(const NamedMDNode *node) {
+  // Leave debug metadata to the -strip-debug pass.
+  return node->getName().startswith("llvm.dbg.");
+}
+
 static bool DoStripMetadata(Module &M) {
   bool Changed = false;
 
@@ -69,6 +74,16 @@ static bool DoStripMetadata(Module &M) {
     }
   }
 
+  // Strip unsupported named metadata.
+  SmallVector<NamedMDNode*, 8> ToErase;
+  for (Module::NamedMDListType::iterator I = M.named_metadata_begin(),
+           E = M.named_metadata_end(); I != E; ++I) {
+    if (!IsWhitelistedMetadata(I))
+      ToErase.push_back(I);
+  }
+  for (size_t i = 0; i < ToErase.size(); ++i)
+    M.eraseNamedMetadata(ToErase[i]);
+
   return Changed;
 }