Do not use named md nodes to track variables that are completely optimized. This does not scale while doing LTO with debug info. New approach is to include list of variables in the subprogram info directly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138145 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 38 insertions, 6 deletions

diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index e6ce9e4..7935fad 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -512,6 +512,23 @@ unsigned DISubprogram::isOptimized() const {
   return 0;
 }
 
+MDNode *DISubprogram::getVariablesNodes() const {
+  if (!DbgNode || DbgNode->getNumOperands() <= 19)
+    return NULL;
+  if (MDNode *Temp = dyn_cast_or_null<MDNode>(DbgNode->getOperand(19)))
+    return dyn_cast_or_null<MDNode>(Temp->getOperand(0));
+  return NULL;
+}
+
+DIArray DISubprogram::getVariables() const {
+  if (!DbgNode || DbgNode->getNumOperands() <= 19)
+    return DIArray();
+  if (MDNode *T = dyn_cast_or_null<MDNode>(DbgNode->getOperand(19)))
+    if (MDNode *A = dyn_cast_or_null<MDNode>(T->getOperand(0)))
+      return DIArray(A);
+  return DIArray();
+}
+
 StringRef DIScope::getFilename() const {
   if (!DbgNode)
     return StringRef();
@@ -825,19 +842,34 @@ static void fixupObjcLikeName(StringRef Str, SmallVectorImpl<char> &Out) {
 
 /// getFnSpecificMDNode - Return a NameMDNode, if available, that is 
 /// suitable to hold function specific information.
-NamedMDNode *llvm::getFnSpecificMDNode(const Module &M, StringRef FuncName) {
+NamedMDNode *llvm::getFnSpecificMDNode(const Module &M, DISubprogram Fn) {
   SmallString<32> Name = StringRef("llvm.dbg.lv.");
-  fixupObjcLikeName(FuncName, Name);
-
+  StringRef FName = "fn";
+  if (Fn.getFunction())
+    FName = Fn.getFunction()->getName();
+  else
+    FName = Fn.getName();
+  char One = '\1';
+  if (FName.startswith(StringRef(&One, 1)))
+    FName = FName.substr(1);
+  fixupObjcLikeName(FName, Name);
   return M.getNamedMetadata(Name.str());
 }
 
 /// getOrInsertFnSpecificMDNode - Return a NameMDNode that is suitable
 /// to hold function specific information.
-NamedMDNode *llvm::getOrInsertFnSpecificMDNode(Module &M, StringRef FuncName) {
+NamedMDNode *llvm::getOrInsertFnSpecificMDNode(Module &M, DISubprogram Fn) {
   SmallString<32> Name = StringRef("llvm.dbg.lv.");
-  fixupObjcLikeName(FuncName, Name);
-
+  StringRef FName = "fn";
+  if (Fn.getFunction())
+    FName = Fn.getFunction()->getName();
+  else
+    FName = Fn.getName();
+  char One = '\1';
+  if (FName.startswith(StringRef(&One, 1)))
+    FName = FName.substr(1);
+  fixupObjcLikeName(FName, Name);
+  
   return M.getOrInsertNamedMetadata(Name.str());
 }