[compiler-rt] [sanitizers] Add VMA size check at runtime

This patch adds a runtime check for asan, dfsan, msan, and tsan for
architectures that support multiple VMA size (like aarch64).  Currently
the check only prints a warning indicating which is the VMA built and
expected against the one detected at runtime.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@247413 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_posix.cc b/lib/sanitizer_common/sanitizer_posix.cc
index 869ede4d5..54b39e0ed 100644
--- a/lib/sanitizer_common/sanitizer_posix.cc
+++ b/lib/sanitizer_common/sanitizer_posix.cc
@@ -324,6 +324,22 @@ SignalContext SignalContext::Create(void *siginfo, void *context) {
   return SignalContext(context, addr, pc, sp, bp);
 }
 
+// This function check is the built VMA matches the runtime one for
+// architectures with multiple VMA size.
+void CheckVMASize() {
+#ifdef __aarch64__
+  static const unsigned kBuiltVMA = SANITIZER_AARCH64_VMA;
+  unsigned maxRuntimeVMA =
+    (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1);
+  if (kBuiltVMA != maxRuntimeVMA) {
+    Printf("WARNING: %s runtime VMA is not the one built for.\n",
+      SanitizerToolName);
+    Printf("\tBuilt VMA:   %u bits\n", kBuiltVMA);
+    Printf("\tRuntime VMA: %u bits\n", maxRuntimeVMA);
+  }
+#endif
+}
+
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_POSIX