Recommit rL323952: [DebugInfo] Enable debug information for C99 VLA types.

Fixed build issue when building with g++-4.8 (specialization after instantiation).

llvm-svn: 324173

1 files changed, 25 insertions, 16 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index d29e0791fbb..e766ccc203b 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -2292,12 +2292,14 @@ llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
                                       llvm::DIFile *Unit) {
   llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
   int64_t Count = Ty->getNumElements();
-  if (Count == 0)
-    // If number of elements are not known then this is an unbounded array.
-    // Use Count == -1 to express such arrays.
-    Count = -1;
 
-  llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(0, Count);
+  llvm::Metadata *Subscript;
+  QualType QTy(Ty, 0);
+  auto SizeExpr = SizeExprCache.find(QTy);
+  if (SizeExpr != SizeExprCache.end())
+    Subscript = DBuilder.getOrCreateSubrange(0, SizeExpr->getSecond());
+  else
+    Subscript = DBuilder.getOrCreateSubrange(0, Count ? Count : -1);
   llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
 
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
@@ -2354,8 +2356,12 @@ llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
       }
     }
 
-    // FIXME: Verify this is right for VLAs.
-    Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
+    auto SizeNode = SizeExprCache.find(EltTy);
+    if (SizeNode != SizeExprCache.end())
+      Subscripts.push_back(
+          DBuilder.getOrCreateSubrange(0, SizeNode->getSecond()));
+    else
+      Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
     EltTy = Ty->getElementType();
   }
 
@@ -3473,13 +3479,14 @@ llvm::DIType *CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
                                    nullptr, Elements);
 }
 
-void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::Value *Storage,
-                              llvm::Optional<unsigned> ArgNo,
-                              CGBuilderTy &Builder) {
+llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
+                                                llvm::Value *Storage,
+                                                llvm::Optional<unsigned> ArgNo,
+                                                CGBuilderTy &Builder) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
   if (VD->hasAttr<NoDebugAttr>())
-    return;
+    return nullptr;
 
   bool Unwritten =
       VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
@@ -3497,7 +3504,7 @@ void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::Value *Storage,
   // If there is no debug info for this type then do not emit debug info
   // for this variable.
   if (!Ty)
-    return;
+    return nullptr;
 
   // Get location information.
   unsigned Line = 0;
@@ -3593,13 +3600,15 @@ void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::Value *Storage,
   DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
                          llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
                          Builder.GetInsertBlock());
+
+  return D;
 }
 
-void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
-                                            llvm::Value *Storage,
-                                            CGBuilderTy &Builder) {
+llvm::DILocalVariable *
+CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD, llvm::Value *Storage,
+                                       CGBuilderTy &Builder) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  EmitDeclare(VD, Storage, llvm::None, Builder);
+  return EmitDeclare(VD, Storage, llvm::None, Builder);
 }
 
 llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,