From: John Thompson <John.Thompson.JTSoftware@gmail.com>
Date: Fri, 23 Oct 2009 02:21:17 +0000 (+0000)
Subject: Fixed undefined behavior in pushMappings when the stack has to resize.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ca2c3e2cfc630db614298e8d7f2aaca4507e01e1;p=clang

Fixed undefined behavior in pushMappings when the stack has to resize.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@84924 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Basic/Diagnostic.cpp b/lib/Basic/Diagnostic.cpp
index d665e49126..fbc7313116 100644
--- a/lib/Basic/Diagnostic.cpp
+++ b/lib/Basic/Diagnostic.cpp
@@ -230,6 +230,8 @@ Diagnostic::~Diagnostic() {
 
 
 void Diagnostic::pushMappings() {
+  // Avoids undefined behavior when the stack has to resize.
+  DiagMappingsStack.reserve(DiagMappingsStack.size() + 1);
   DiagMappingsStack.push_back(DiagMappingsStack.back());
 }