Tell Valgrind when we modify already-executed machine code so it knows

to re-instrument the code.  We depend on the system valgrind.h to
avoid adding a new license.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98529 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 38 insertions, 0 deletions

diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 1f48ae9687..adbcc1132f 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -452,6 +452,9 @@
 /* Define to 1 if the system has the type `u_int64_t'. */
 #undef HAVE_U_INT64_T
 
+/* Define to 1 if you have the <valgrind/valgrind.h> header file. */
+#cmakedefine HAVE_VALGRIND_VALGRIND_H ${HAVE_VALGRIND_VALGRIND_H}
+
 /* Define to 1 if you have the <windows.h> header file. */
 #cmakedefine HAVE_WINDOWS_H ${HAVE_WINDOWS_H}
 
diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index ce4f37487e..5caf778a2d 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -440,6 +440,9 @@
 /* Define to 1 if the system has the type `u_int64_t'. */
 #undef HAVE_U_INT64_T
 
+/* Define to 1 if you have the <valgrind/valgrind.h> header file. */
+#undef HAVE_VALGRIND_VALGRIND_H
+
 /* Define to 1 if you have the <windows.h> header file. */
 #undef HAVE_WINDOWS_H
 
diff --git a/include/llvm/System/Valgrind.h b/include/llvm/System/Valgrind.h
new file mode 100644
index 0000000000..5ec79c3c55
--- /dev/null
+++ b/include/llvm/System/Valgrind.h
@@ -0,0 +1,32 @@
+//===- llvm/System/Valgrind.h - Communication with Valgrind -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Methods for communicating with a valgrind instance this program is running
+// under.  These are all no-ops unless LLVM was configured on a system with the
+// valgrind headers installed and valgrind is controlling this process.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_VALGRIND_H
+#define LLVM_SYSTEM_VALGRIND_H
+
+#include <stddef.h>
+
+namespace llvm {
+namespace sys {
+  // True if Valgrind is controlling this process.
+  bool RunningOnValgrind();
+
+  // Discard valgrind's translation of code in the range [Addr .. Addr + Len).
+  // Otherwise valgrind may continue to execute the old version of the code.
+  void ValgrindDiscardTranslations(const void *Addr, size_t Len);
+}
+}
+
+#endif