[cfi] Build __cfi_check as Thumb when applicable.
Summary:
Cross-DSO CFI needs all __cfi_check exports to use the same encoding
(ARM vs Thumb).
Reviewers: pcc
Subscribers: aemerson, srhines, kristof.beyls, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D37243
llvm-svn: 312052
diff --git a/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp b/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp
index d94aa5d..0098b60 100644
--- a/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp
+++ b/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp
@@ -16,6 +16,7 @@
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/EquivalenceClasses.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
@@ -115,6 +116,11 @@
// linker knows about the symbol; this pass replaces the function body.
F->deleteBody();
F->setAlignment(4096);
+
+ Triple T(M.getTargetTriple());
+ if (T.isARM() || T.isThumb())
+ F->addFnAttr("target-features", "+thumb-mode");
+
auto args = F->arg_begin();
Value &CallSiteTypeId = *(args++);
CallSiteTypeId.setName("CallSiteTypeId");