From ef8857dfdd4d6b4d139278c52d32e3f2e055c5d7 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Fri, 28 Oct 2011 21:12:13 +0000
Subject: [PATCH] In case of template specialization, do not try to delay
 emitting debug info for concrete type in -flimit-debug-info mode. This fixes
 some of the failures from bs15503.exp tests in gdb testsuite.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143227 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGDebugInfo.cpp                   | 26 +++++++++++++++----
 test/CodeGenCXX/debug-info-template-limit.cpp | 15 +++++++++++
 2 files changed, 36 insertions(+), 5 deletions(-)
 create mode 100644 test/CodeGenCXX/debug-info-template-limit.cpp

diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index 4448153591..b7107d5883 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -745,11 +745,27 @@ CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
   if (!Method->isStatic()) {
     // "this" pointer is always first argument.
     QualType ThisPtr = Method->getThisType(CGM.getContext());
-    llvm::DIType ThisPtrType =
-      DBuilder.createArtificialType(getOrCreateType(ThisPtr, Unit));
-    
-    TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
-    Elts.push_back(ThisPtrType);
+
+    const CXXRecordDecl *RD = Method->getParent();
+    if (isa<ClassTemplateSpecializationDecl>(RD)) {
+      // Create pointer type directly in this case.
+      const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
+      QualType PointeeTy = ThisPtrTy->getPointeeType();
+      unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
+      uint64_t Size = CGM.getContext().getTargetInfo().getPointerWidth(AS);
+      uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
+      llvm::DIType PointeeType =  getOrCreateType(PointeeTy, Unit);
+      llvm::DIType ThisPtrType =
+        DBuilder.createArtificialType
+        (DBuilder.createPointerType(PointeeType, Size, Align));
+      TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
+      Elts.push_back(ThisPtrType);
+    } else {
+      llvm::DIType ThisPtrType =
+        DBuilder.createArtificialType(getOrCreateType(ThisPtr, Unit));
+      TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
+      Elts.push_back(ThisPtrType);
+    }
   }
 
   // Copy rest of the arguments.
diff --git a/test/CodeGenCXX/debug-info-template-limit.cpp b/test/CodeGenCXX/debug-info-template-limit.cpp
new file mode 100644
index 0000000000..796a80fd62
--- /dev/null
+++ b/test/CodeGenCXX/debug-info-template-limit.cpp
@@ -0,0 +1,15 @@
+// RUN: %clang -flimit-debug-info -emit-llvm -g -S %s -o - | FileCheck %s
+
+// Check that this pointer type is TC<int>
+// CHECK: !10} ; [ DW_TAG_pointer_type
+// CHECK-NEXT: !10 ={{.*}}"TC<int>"
+
+template<typename T>
+class TC {
+public:
+  TC(const TC &) {}
+  TC() {}
+};
+
+TC<int> tci;
+
-- 
2.40.0