[SystemZ][z/OS] Add GOFF Support to the DataLayout

- This patch adds in the GOFF mangling support to the LLVM data layout string. A corresponding additional line has been added into the data layout section in the language reference documentation.
- Furthermore, this patch also sets the right data layout string for the z/OS target in the SystemZ backend.

Reviewed By: uweigand, Kai, abhina.sreeskantharajan, MaskRay

Differential Revision: https://reviews.llvm.org/D109362

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/IR/DataLayout.cpp b/llvm/lib/IR/DataLayout.cpp
index 4f6140e..5de47b8 100644
--- a/llvm/lib/IR/DataLayout.cpp
+++ b/llvm/lib/IR/DataLayout.cpp
@@ -151,6 +151,8 @@ PointerAlignElem::operator==(const PointerAlignElem &rhs) const {
 //===----------------------------------------------------------------------===//
 
 const char *DataLayout::getManglingComponent(const Triple &T) {
+  if (T.isOSBinFormatGOFF())
+    return "-m:l";
   if (T.isOSBinFormatMachO())
     return "-m:o";
   if (T.isOSWindows() && T.isOSBinFormatCOFF())
@@ -500,6 +502,9 @@ Error DataLayout::parseSpecifier(StringRef Desc) {
       case 'e':
         ManglingMode = MM_ELF;
         break;
+      case 'l':
+        ManglingMode = MM_GOFF;
+        break;
       case 'o':
         ManglingMode = MM_MachO;
         break;