[compiler-rt] Add support for the dynamic shadow allocation

Summary:
This patch is adding the needed code to compiler-rt to support
dynamic shadow.

This is to support this patch:
  https://reviews.llvm.org/D23354

It's adding support for using a shadow placed at a dynamic address determined
at runtime.

The dynamic shadow is required to work on windows 64-bits.

Reviewers: rnk, kcc, vitalybuka

Subscribers: kubabrecka, dberris, llvm-commits, chrisha

Differential Revision: https://reviews.llvm.org/D23363

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@281909 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_posix.cc b/lib/sanitizer_common/sanitizer_posix.cc
index c70d5a40c..e00f2a929 100644
--- a/lib/sanitizer_common/sanitizer_posix.cc
+++ b/lib/sanitizer_common/sanitizer_posix.cc
@@ -358,6 +358,11 @@ SignalContext SignalContext::Create(void *siginfo, void *context) {
   return SignalContext(context, addr, pc, sp, bp, is_memory_access, write_flag);
 }
 
+uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding) {
+  CHECK("FindAvailableMemoryRange is not available" && 0);
+  return 0;
+}
+
 } // namespace __sanitizer
 
 #endif // SANITIZER_POSIX