[RuntimeDyld] Don't try to allocate sections with align 0.

ELF sections allow 0 for the alignment, which is specified to
be the same as 1.  However many clients do not expect this and
will behave poorly in the presence of a 0-aligned section (for
example by trying to modulo something by the section alignment).
We can be more polite by making sure that we always pass a
non-zero value to clients.

Differential Revision: https://reviews.llvm.org/D57482

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352694 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
index 473a8120b424e0162d91416a06b3240d671ea16f..589cdcbcb0d12490ff87da9c344c790482f7e895 100644 (file)
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -743,6 +743,11 @@ RuntimeDyldImpl::emitSection(const ObjectFile &Obj,
   bool IsReadOnly = isReadOnlyData(Section);
   uint64_t DataSize = Section.getSize();
 
+  // An alignment of 0 (at least with ELF) is identical to an alignment of 1,
+  // while being more "polite".  Other formats do not support 0-aligned sections
+  // anyway, so we should guarantee that the alignment is always at least 1.
+  Alignment = std::max(1u, Alignment);
+
   StringRef Name;
   if (auto EC = Section.getName(Name))
     return errorCodeToError(EC);