[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.

llvm-svn: 358865

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp b/llvm/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
index 2aa4a45600c..38c537b5c78 100644
--- a/llvm/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
+++ b/llvm/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;
       }