From: Lang Hames <lhames@gmail.com>
Date: Mon, 22 Apr 2019 01:35:16 +0000 (+0000)
Subject: [JITLink] Fix section start address calculation in eh-frame recorder.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c13dba05ba5968a9ac1d10c064da59d313ba0825;p=llvm

[JITLink] Fix section start address calculation in eh-frame recorder.

Section atoms are not sorted, so we need to scan the whole section to find the
start address.

No test case: Found by inspection, and any reproduction would depend on pointer
ordering.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358865 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp b/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
index 2aa4a45600c..38c537b5c78 100644
--- a/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
+++ b/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
@@ -516,6 +516,9 @@ AtomGraphPassFunction createEHFrameRecorderPass(const Triple &TT,
     for (auto &S : G.sections())
       if (S.getName() == EHFrameSectionName && !S.atoms_empty()) {
         Addr = (*S.atoms().begin())->getAddress();
+        for (auto *DA : S.atoms())
+          if (DA->getAddress() < Addr)
+            Addr = DA->getAddress();
         break;
       }