Rebased PNaCl localmods in LLVM to 223109

lib/Transforms/MinSFI/Utils.cpp

Index: lib/Transforms/MinSFI/Utils.cpp
diff --git a/lib/Transforms/MinSFI/Utils.cpp b/lib/Transforms/MinSFI/Utils.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a1f02e2c05ff3c1e0d7d91a180bb903d8659241d
--- /dev/null
+++ b/lib/Transforms/MinSFI/Utils.cpp
@@ -0,0 +1,28 @@
+//===-- Utils.cpp - Helper functions for MinSFI passes --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Transforms/MinSFI.h"
+
+using namespace llvm;
+
+static cl::opt<uint32_t>
+PointerSizeInBits("minsfi-ptrsize", cl::init(32),
+                  cl::desc("Size of the address subspace in bits"));
+
+uint32_t minsfi::GetPointerSizeInBits() {
+  if (PointerSizeInBits < 20 || PointerSizeInBits > 32)
+    report_fatal_error("MinSFI: Size of the sandboxed pointers is out of "
+                       "bounds (20-32)");
+  return PointerSizeInBits;
+}
+
+uint64_t minsfi::GetAddressSubspaceSize() {
+  return 1LL << GetPointerSizeInBits();
+}