Debug Info: Fix a problem that resulted in missing DW_AT_specifications

for C++ constructors.

If the DIType for a class was generated by
CGDebugInfo::createContextChain(), the cache contains only a
limited DIType wihtout any declarations. Since EmitFunctionStart()
needs to find the canonical declaration for each method, we
construct the complete type before emitting any method.

rdar://problem/13116508

llvm-svn: 181561

1 files changed, 18 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 1da4e87c0a5..717ed17dd4e 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1232,6 +1232,23 @@ CodeGenModule::shouldEmitFunction(const FunctionDecl *F) {
   return !isTriviallyRecursive(F);
 }
 
+/// If the type for the method's class was generated by
+/// CGDebugInfo::createContextChain(), the cache contains only a
+/// limited DIType without any declarations. Since EmitFunctionStart()
+/// needs to find the canonical declaration for each method, we need
+/// to construct the complete type prior to emitting the method.
+void CodeGenModule::CompleteDIClassType(const CXXMethodDecl* D) {
+  if (!D->isInstance())
+    return;
+
+  if (CGDebugInfo *DI = getModuleDebugInfo())
+    if (getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
+      const PointerType *ThisPtr =
+        cast<PointerType>(D->getThisType(getContext()));
+      DI->getOrCreateRecordType(ThisPtr->getPointeeType(), D->getLocation());
+    }
+}
+
 void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
   const ValueDecl *D = cast<ValueDecl>(GD.getDecl());
 
@@ -1246,6 +1263,7 @@ void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
       return;
 
     if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
+      CompleteDIClassType(Method);
       // Make sure to emit the definition(s) before we emit the thunks.
       // This is necessary for the generation of certain thunks.
       if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))