[JITLink] Add two useful Section operations: find by name, get address range.

These operations were already used in eh-frame registration, and are likely to
be used in other runtime registrations, so this commit moves them into a header
where they can be re-used.

llvm-svn: 359950

1 files changed, 2 insertions, 9 deletions

diff --git a/llvm/lib/ExecutionEngine/JITLink/EHFrameSupport.cpp b/llvm/lib/ExecutionEngine/JITLink/EHFrameSupport.cpp
index b54fd378aa5..67c37a5f9b1 100644
--- a/llvm/lib/ExecutionEngine/JITLink/EHFrameSupport.cpp
+++ b/llvm/lib/ExecutionEngine/JITLink/EHFrameSupport.cpp
@@ -521,15 +521,8 @@ createEHFrameRecorderPass(const Triple &TT,
     // Search for a non-empty eh-frame and record the address of the first atom
     // in it.
     JITTargetAddress Addr = 0;
-    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;
-      }
-
+    if (auto *S = G.findSectionByName(EHFrameSectionName))
+      Addr = S->getRange().getStart();
     StoreFrameAddress(Addr);
     return Error::success();
   };