Revert "DebugInfo: Ensure that all debug location scope chains from instructions within a function, lead to the function itself."

This invariant is violated (& the assertions fire) on some Objective C++
in the test-suite. Reverting while I investigate.

This reverts commit r219215.

llvm-svn: 219523

2 files changed, 2 insertions, 35 deletions

diff --git a/llvm/lib/CodeGen/LexicalScopes.cpp b/llvm/lib/CodeGen/LexicalScopes.cpp
index b621e3baee5..4600b2943c9 100644
--- a/llvm/lib/CodeGen/LexicalScopes.cpp
+++ b/llvm/lib/CodeGen/LexicalScopes.cpp
@@ -137,8 +137,6 @@ LexicalScope *LexicalScopes::findLexicalScope(DebugLoc DL) {
 /// getOrCreateLexicalScope - Find lexical scope for the given DebugLoc. If
 /// not available then create new lexical scope.
 LexicalScope *LexicalScopes::getOrCreateLexicalScope(DebugLoc DL) {
-  if (DL.isUnknown())
-    return nullptr;
   MDNode *Scope = nullptr;
   MDNode *InlinedAt = nullptr;
   DL.getScopeAndInlinedAt(Scope, InlinedAt, MF->getFunction()->getContext());
@@ -174,12 +172,9 @@ LexicalScope *LexicalScopes::getOrCreateRegularScope(MDNode *Scope) {
                               std::make_tuple(Parent, DIDescriptor(Scope),
                                               nullptr, false)).first;
 
-  if (!Parent) {
-    assert(DIDescriptor(Scope).isSubprogram());
-    assert(DISubprogram(Scope).describes(MF->getFunction()));
-    assert(!CurrentFnLexicalScope);
+  if (!Parent && DIDescriptor(Scope).isSubprogram() &&
+      DISubprogram(Scope).describes(MF->getFunction()))
     CurrentFnLexicalScope = &I->second;
-  }
 
   return &I->second;
 }
diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 4a52a9312fa..b5c27933f16 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -568,34 +568,6 @@ bool DISubprogram::Verify() const {
   if (isLValueReference() && isRValueReference())
     return false;
 
-  // If a DISubprogram has an llvm::Function*, then scope chains from all
-  // instructions within the function should lead to this DISubprogram.
-  if (auto *F = getFunction()) {
-    LLVMContext &Ctxt = F->getContext();
-    for (auto &BB : *F) {
-      for (auto &I : BB) {
-        DebugLoc DL = I.getDebugLoc();
-        if (DL.isUnknown())
-          continue;
-
-        MDNode *Scope = nullptr;
-        MDNode *IA = nullptr;
-        // walk the inlined-at scopes
-        while (DL.getScopeAndInlinedAt(Scope, IA, F->getContext()), IA)
-          DL = DebugLoc::getFromDILocation(IA);
-        DL.getScopeAndInlinedAt(Scope, IA, Ctxt);
-        assert(!IA);
-        while (!DIDescriptor(Scope).isSubprogram()) {
-          DILexicalBlockFile D(Scope);
-          Scope = D.isLexicalBlockFile()
-                      ? D.getScope()
-                      : DebugLoc::getFromDILexicalBlock(Scope).getScope(Ctxt);
-        }
-        if (!DISubprogram(Scope).describes(F))
-          return false;
-      }
-    }
-  }
   return DbgNode->getNumOperands() == 9 && getNumHeaderFields() == 12;
 }