From a0a7ad427aebf1fee6444ae3e67dcbf1426d3ee6 Mon Sep 17 00:00:00 2001
From: David Blaikie <dblaikie@gmail.com>
Date: Wed, 6 Aug 2014 22:30:12 +0000
Subject: [PATCH] Revert "Reapply "DebugInfo: Ensure that all debug location
 scope chains from instructions within a function, lead to the function
 itself.""

This reverts commit r214761.

Revert while Reid investigates & provides a reproduction for an
assertion failure for this on Windows.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214999 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/LexicalScopes.cpp |  9 ++-------
 lib/IR/DebugInfo.cpp          | 26 --------------------------
 2 files changed, 2 insertions(+), 33 deletions(-)

diff --git a/lib/CodeGen/LexicalScopes.cpp b/lib/CodeGen/LexicalScopes.cpp
index f67c717d4e4..d12c234bf3b 100644
--- a/lib/CodeGen/LexicalScopes.cpp
+++ b/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/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index 1bf90e49e7d..c59b77eca0a 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -560,32 +560,6 @@ bool DISubprogram::Verify() const {
   if (isLValueReference() && isRValueReference())
     return false;
 
-  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() == 20;
 }