From af0de01c6b3395fb1dba5d2ee0a94c19a9b464e9 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Sat, 1 Aug 2015 07:29:36 +0200
Subject: cmState: Remove call stack parent tracking.

This was added at a time when I thought the cmState would report errors,
but that is not the direction it is going.  The ordering of the stack of
scopes is canonical and clients are required to maintain it.
---
 Source/cmState.cxx | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/Source/cmState.cxx b/Source/cmState.cxx
index a466471..a7df040 100644
--- a/Source/cmState.cxx
+++ b/Source/cmState.cxx
@@ -20,7 +20,6 @@
 
 struct cmState::SnapshotDataType
 {
-  cmState::PositionType CallStackParent;
   cmState::PositionType DirectoryParent;
   cmState::SnapshotType SnapshotType;
   cmLinkedTree<std::string>::iterator ExecutionListFile;
@@ -732,7 +731,6 @@ cmState::CreateBuildsystemDirectorySnapshot(Snapshot originSnapshot,
 {
   assert(originSnapshot.IsValid());
   PositionType pos = this->SnapshotData.Extend(originSnapshot.Position);
-  pos->CallStackParent = originSnapshot.Position;
   pos->EntryPointLine = entryPointLine;
   pos->EntryPointCommand = entryPointCommand;
   pos->DirectoryParent = originSnapshot.Position;
@@ -754,7 +752,6 @@ cmState::CreateFunctionCallSnapshot(cmState::Snapshot originSnapshot,
 {
   PositionType pos = this->SnapshotData.Extend(originSnapshot.Position,
                                                *originSnapshot.Position);
-  pos->CallStackParent = originSnapshot.Position;
   pos->EntryPointLine = entryPointLine;
   pos->EntryPointCommand = entryPointCommand;
   pos->SnapshotType = FunctionCallType;
@@ -772,7 +769,6 @@ cmState::CreateMacroCallSnapshot(cmState::Snapshot originSnapshot,
 {
   PositionType pos = this->SnapshotData.Extend(originSnapshot.Position,
                                                *originSnapshot.Position);
-  pos->CallStackParent = originSnapshot.Position;
   pos->EntryPointLine = entryPointLine;
   pos->EntryPointCommand = entryPointCommand;
   pos->SnapshotType = MacroCallType;
@@ -789,7 +785,6 @@ cmState::CreateCallStackSnapshot(cmState::Snapshot originSnapshot,
 {
   PositionType pos = this->SnapshotData.Extend(originSnapshot.Position,
                                                *originSnapshot.Position);
-  pos->CallStackParent = originSnapshot.Position;
   pos->EntryPointLine = entryPointLine;
   pos->EntryPointCommand = entryPointCommand;
   pos->SnapshotType = CallStackType;
@@ -806,7 +801,6 @@ cmState::CreateInlineListFileSnapshot(cmState::Snapshot originSnapshot,
 {
   PositionType pos = this->SnapshotData.Extend(originSnapshot.Position,
                                                *originSnapshot.Position);
-  pos->CallStackParent = originSnapshot.Position;
   pos->EntryPointLine = entryPointLine;
   pos->EntryPointCommand = entryPointCommand;
   pos->SnapshotType = InlineListFileType;
@@ -827,11 +821,7 @@ cmState::Snapshot cmState::Pop(cmState::Snapshot originSnapshot)
   prevPos->CompileOptionsPosition =
       prevPos->BuildSystemDirectory->CompileOptions.size();
 
-  if (prevPos == this->SnapshotData.Root())
-    {
-    return Snapshot(this, prevPos);
-    }
-  return Snapshot(this, originSnapshot.Position->CallStackParent);
+  return Snapshot(this, prevPos);
 }
 
 cmState::Snapshot::Snapshot(cmState* state)
-- 
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