Make a provision to encode inline location in a variable. This will enable dwarf writer to easily distinguish between two instances of a inlined variable in one basic block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135457 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 32 insertions, 5 deletions

diff --git a/include/llvm/Analysis/DebugInfo.h b/include/llvm/Analysis/DebugInfo.h
index fbee5a6311..77b95dbc2e 100644
--- a/include/llvm/Analysis/DebugInfo.h
+++ b/include/llvm/Analysis/DebugInfo.h
@@ -628,7 +628,9 @@ namespace llvm {
     uint64_t getAddrElement(unsigned Idx) const {
       if (getVersion() <= llvm::LLVMDebugVersion8)
         return getUInt64Field(Idx+6);
-      return getUInt64Field(Idx+7);
+      if (getVersion() == llvm::LLVMDebugVersion9)
+        return getUInt64Field(Idx+7);
+      return getUInt64Field(Idx+8);
     }
 
     /// isBlockByrefVariable - Return true if the variable was declared as
@@ -716,6 +718,13 @@ namespace llvm {
   /// suitable to hold function specific information.
   NamedMDNode *getFnSpecificMDNode(const Module &M, StringRef Name);
 
+  /// createInlinedVariable - Create a new inlined variable based on current
+  /// variable.
+  /// @param DV            Current Variable.
+  /// @param InlinedScope  Location at current variable is inlined.
+  DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
+                                   LLVMContext &VMContext);
+
   class DebugInfoFinder {
   public:
     /// processModule - Process entire module and collect debug info
diff --git a/include/llvm/Support/Dwarf.h b/include/llvm/Support/Dwarf.h
index 70bac0c9fc..3c76902c84 100644
--- a/include/llvm/Support/Dwarf.h
+++ b/include/llvm/Support/Dwarf.h
@@ -22,8 +22,9 @@ namespace llvm {
 // Debug info constants.
 
 enum {
-  LLVMDebugVersion = (9 << 16),         // Current version of debug information.
-  LLVMDebugVersion8 = (8 << 16),         // Cconstant for version 8.
+  LLVMDebugVersion = (10 << 16),        // Current version of debug information.
+  LLVMDebugVersion9 = (9 << 16),        // Constant for version 9.
+  LLVMDebugVersion8 = (8 << 16),        // Constant for version 8.
   LLVMDebugVersion7 = (7 << 16),        // Constant for version 7.
   LLVMDebugVersion6 = (6 << 16),        // Constant for version 6.
   LLVMDebugVersion5 = (5 << 16),        // Constant for version 5.
diff --git a/lib/Analysis/DIBuilder.cpp b/lib/Analysis/DIBuilder.cpp
index ac5eeeb470..da5780827a 100644
--- a/lib/Analysis/DIBuilder.cpp
+++ b/lib/Analysis/DIBuilder.cpp
@@ -626,7 +626,8 @@ DIVariable DIBuilder::createLocalVariable(unsigned Tag, DIDescriptor Scope,
     File,
     ConstantInt::get(Type::getInt32Ty(VMContext), (LineNo | (ArgNo << 24))),
     Ty,
-    ConstantInt::get(Type::getInt32Ty(VMContext), Flags)
+    ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
+    Constant::getNullValue(Type::getInt32Ty(VMContext)),
   };
   MDNode *Node = MDNode::get(VMContext, Elts);
   if (AlwaysPreserve) {
@@ -661,6 +662,7 @@ DIVariable DIBuilder::createComplexVariable(unsigned Tag, DIDescriptor Scope,
   Elts.push_back(ConstantInt::get(Type::getInt32Ty(VMContext), (LineNo | (ArgNo << 24))));
   Elts.push_back(Ty);
   Elts.push_back(llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)));
+  Elts.push_back(llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)));
   Elts.append(Addr.begin(), Addr.end());
 
   return DIVariable(MDNode::get(VMContext, Elts));
diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index b42e946f2f..8fac3fb721 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -111,7 +111,9 @@ Function *DIDescriptor::getFunctionField(unsigned Elt) const {
 unsigned DIVariable::getNumAddrElements() const {
   if (getVersion() <= llvm::LLVMDebugVersion8)
     return DbgNode->getNumOperands()-6;
-  return DbgNode->getNumOperands()-7;
+  if (getVersion() == llvm::LLVMDebugVersion9)
+    return DbgNode->getNumOperands()-7;
+  return DbgNode->getNumOperands()-8;
 }
 
 
@@ -760,6 +762,19 @@ NamedMDNode *llvm::getOrInsertFnSpecificMDNode(Module &M, StringRef FuncName) {
   return M.getOrInsertNamedMetadata(Name.str());
 }
 
+/// createInlinedVariable - Create a new inlined variable based on current
+/// variable.
+/// @param DV            Current Variable.
+/// @param InlinedScope  Location at current variable is inlined.
+DIVariable llvm::createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
+                                       LLVMContext &VMContext) {
+  SmallVector<Value *, 16> Elts;
+  // Insert inlined scope as 7th element.
+  for (unsigned i = 0, e = DV->getNumOperands(); i != e; ++i)
+    i == 7 ? Elts.push_back(InlinedScope) :
+             Elts.push_back(DV->getOperand(i));
+  return DIVariable(MDNode::get(VMContext, Elts));
+}
 
 //===----------------------------------------------------------------------===//
 // DebugInfoFinder implementations.