Add Windows Control Flow Guard checks (/guard:cf).
Summary:
A new function pass (Transforms/CFGuard/CFGuard.cpp) inserts CFGuard checks on
indirect function calls, using either the check mechanism (X86, ARM, AArch64) or
or the dispatch mechanism (X86-64). The check mechanism requires a new calling
convention for the supported targets. The dispatch mechanism adds the target as
an operand bundle, which is processed by SelectionDAG. Another pass
(CodeGen/CFGuardLongjmp.cpp) identifies and emits valid longjmp targets, as
required by /guard:cf. This feature is enabled using the `cfguard` CC1 option.
Reviewers: thakis, rnk, theraven, pcc
Subscribers: ychen, hans, metalcanine, dmajor, tomrittervg, alex, mehdi_amini, mgorny, javed.absar, kristof.beyls, hiraditya, steven_wu, dexonsmith, cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D65761
diff --git a/llvm/lib/Transforms/CMakeLists.txt b/llvm/lib/Transforms/CMakeLists.txt
index 74db9e5..dda5f6d 100644
--- a/llvm/lib/Transforms/CMakeLists.txt
+++ b/llvm/lib/Transforms/CMakeLists.txt
@@ -8,3 +8,4 @@
add_subdirectory(Hello)
add_subdirectory(ObjCARC)
add_subdirectory(Coroutines)
+add_subdirectory(CFGuard)