[PATCH] D12580: Added StrictVTablePointers linking requirement

[Piotr Padlewski via cfe-commits]

Prazek created this revision.
Prazek added reviewers: rsmith, rjmccall, majnemer, nlewycky.
Prazek added a subscriber: cfe-commits.

Generates code like this
!llvm.module.flags = !{!0, !1}


!0 = !{i32 1, !"StrictVTablePointers", i32 1}
!1 = !{i32 3, !"StrictVTablePointersRequirement", !2}
!2 = !{!"StrictVTablePointers", i32 1}


http://reviews.llvm.org/D12580

Files:
  lib/CodeGen/CodeGenModule.cpp

Index: lib/CodeGen/CodeGenModule.cpp
===================================================================
--- lib/CodeGen/CodeGenModule.cpp
+++ lib/CodeGen/CodeGenModule.cpp
@@ -394,6 +394,22 @@
     // Indicate that we want CodeView in the metadata.
     getModule().addModuleFlag(llvm::Module::Warning, "CodeView", 1);
   }
+  if (CodeGenOpts.OptimizationLevel > 0 && CodeGenOpts.StrictVTablePointers) {
+    // We don't support LTO with 2 with different StrictVTablePointers
+    // FIXME: we could support it by stripping all the information introduced
+    // by StrictVTablePointers.
+
+    getModule().addModuleFlag(llvm::Module::Error, "StrictVTablePointers",1);
+
+    llvm::Metadata *Ops[2] = {
+              llvm::MDString::get(VMContext, "StrictVTablePointers"),
+              llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
+                  llvm::Type::getInt32Ty(VMContext), 1))};
+
+    getModule().addModuleFlag(llvm::Module::Require,
+                              "StrictVTablePointersRequirement",
+                              llvm::MDNode::get(VMContext, Ops));
+  }
   if (DebugInfo)
     // We support a single version in the linked module. The LLVM
     // parser will drop debug info with a different version number


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