[PATCH] [ASan/Win] Add the first version of the RTL thunk to link with DLLs

[Timur Iskhodzhanov]

Hi kcc,

http://llvm-reviews.chandlerc.com/D1377

Files:
  asan_dll_thunk.cc

Index: asan_dll_thunk.cc
===================================================================
--- asan_dll_thunk.cc
+++ asan_dll_thunk.cc
@@ -0,0 +1,79 @@
+//===-- asan_dll_thunk.cc -------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// This file defines a family of thunks that should be statically linked into
+// the DLLs that have ASan instrumentation in order to delegate the calls to the
+// shared runtime that lives in the main binary.
+// See https://code.google.com/p/address-sanitizer/issues/detail?id=209 for the
+// details.
+//===----------------------------------------------------------------------===//
+
+// Only compile this code when buidling asan_dll_thunk.lib
+// Using #ifdef rather than relying on Makefiles etc.
+// simplifies the build procedure.
+#ifdef ASAN_DLL_THUNK
+#include <windows.h>
+
+// ------------------------- Helper macros ------------------ {{{1
+
+static FARPROC getRealProcAddressOrDie(const char *name) {
+  FARPROC ret = GetProcAddress(GetModuleHandle(NULL), name);
+  if (!ret)
+    abort();
+  return ret;
+}
+
+#define WRAP_VV(name)                                                          \
+  extern "C" void name() {                                                     \
+    typedef void (*fntype)();                                                  \
+    fntype fn = (fntype)getRealProcAddressOrDie(#name);                        \
+    fn();                                                                      \
+  }
+
+#define WRAP_VW(name)                                                          \
+  extern "C" void name(void *arg) {                                            \
+    typedef void (*fntype)(void *);                                            \
+    fntype fn = (fntype)getRealProcAddressOrDie(#name);                        \
+    fn(arg);                                                                   \
+  }
+
+#define WRAP_VWW(name)                                                         \
+  extern "C" void name(void *arg1, void *arg2) {                               \
+    typedef void (*fntype)(void *, void *);                                    \
+    fntype fn = (fntype)getRealProcAddressOrDie(#name);                        \
+    fn(arg1, arg2);                                                            \
+  }
+// }}}
+
+WRAP_VV(__asan_init_v3)
+
+WRAP_VW(__asan_report_store1)
+WRAP_VW(__asan_report_store2)
+WRAP_VW(__asan_report_store4)
+WRAP_VW(__asan_report_store8)
+WRAP_VW(__asan_report_store16)
+WRAP_VWW(__asan_report_store_n)
+
+WRAP_VW(__asan_report_load1)
+WRAP_VW(__asan_report_load2)
+WRAP_VW(__asan_report_load4)
+WRAP_VW(__asan_report_load8)
+WRAP_VW(__asan_report_load16)
+WRAP_VWW(__asan_report_load_n)
+
+WRAP_VWW(__asan_register_globals)
+WRAP_VWW(__asan_unregister_globals)
+
+// TODO: Add more interface functions on the as-needed basis.
+
+// TODO: add malloc & friends (see asan_malloc_win.cc).
+
+#endif // ASAN_DLL_THUNK
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