[lld] r315268 - Add comments.

[Rui Ueyama via llvm-commits]

Author: ruiu
Date: Mon Oct  9 20:58:18 2017
New Revision: 315268

URL: http://llvm.org/viewvc/llvm-project?rev=315268&view=rev
Log:
Add comments.

Modified:
    lld/trunk/ELF/SyntheticSections.cpp

Modified: lld/trunk/ELF/SyntheticSections.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/SyntheticSections.cpp?rev=315268&r1=315267&r2=315268&view=diff
==============================================================================
--- lld/trunk/ELF/SyntheticSections.cpp (original)
+++ lld/trunk/ELF/SyntheticSections.cpp Mon Oct  9 20:58:18 2017
@@ -589,6 +589,8 @@ uint64_t EhFrameSection<ELFT>::getFdePc(
 
 template <class ELFT> void EhFrameSection<ELFT>::writeTo(uint8_t *Buf) {
   const endianness E = ELFT::TargetEndianness;
+
+  // Write CIE and FDE records.
   for (CieRecord *Rec : CieRecords) {
     size_t CieOffset = Rec->Cie->OutputOff;
     writeCieFde<ELFT>(Buf + CieOffset, Rec->Cie->data());
@@ -603,6 +605,9 @@ template <class ELFT> void EhFrameSectio
     }
   }
 
+  // Apply relocations. .eh_frame section contents are not contiguous
+  // in the output buffer, but relocateAlloc() still works because
+  // getOffset() takes care of discontiguous section pieces.
   for (EhInputSection *S : Sections)
     S->relocateAlloc(Buf, nullptr);