From 6a659dfd8e717a598f54867aa36c2e4af09d031b Mon Sep 17 00:00:00 2001
From: Alexander Potapenko <glider@google.com>
Date: Mon, 20 May 2013 13:32:35 +0000
Subject: [libsanitizer] Introduce INTERCEPTOR_WITH_SUFFIX which is to be used
 for appending the __DARWIN_ALIAS() version suffixes to function names on
 Darwin. This should fix asan/lit_tests/wait.cc under ASan.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182259 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/interception/interception.h | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

(limited to 'lib/interception')

diff --git a/lib/interception/interception.h b/lib/interception/interception.h
index 2ccc90387..d50af3541 100644
--- a/lib/interception/interception.h
+++ b/lib/interception/interception.h
@@ -35,7 +35,8 @@ typedef __sanitizer::OFF64_T OFF64_T;
 //      int foo(const char *bar, double baz);
 // You'll need to:
 //      1) define INTERCEPTOR(int, foo, const char *bar, double baz) { ... } in
-//         your source file.
+//         your source file. See the notes below for cases when
+//         INTERCEPTOR_WITH_SUFFIX(...) should be used instead.
 //      2) Call "INTERCEPT_FUNCTION(foo)" prior to the first call of "foo".
 //         INTERCEPT_FUNCTION(foo) evaluates to "true" iff the function was
 //         intercepted successfully.
@@ -58,6 +59,11 @@ typedef __sanitizer::OFF64_T OFF64_T;
 //           but instead you'll have to add
 //           DECLARE_REAL(int, foo, const char *bar, double baz) in your
 //           source file (to define a pointer to overriden function).
+//        3. Some Mac functions have symbol variants discriminated by
+//           additional suffixes, e.g. _$UNIX2003 (see
+//           https://developer.apple.com/library/mac/#releasenotes/Darwin/SymbolVariantsRelNotes/index.html
+//           for more details). To intercept such functions you need to use the
+//           INTERCEPTOR_WITH_SUFFIX(...) macro.
 
 // How it works:
 // To replace system functions on Linux we just need to declare functions
@@ -81,6 +87,7 @@ typedef __sanitizer::OFF64_T OFF64_T;
 // INTERCEPT_FUNCTION() is effectively a no-op on this system.
 
 #if defined(__APPLE__)
+#include <sys/cdefs.h>  // For __DARWIN_ALIAS_C().
 
 // Just a pair of pointers.
 struct interpose_substitution {
@@ -174,13 +181,25 @@ const interpose_substitution substitution_##func_name[] \
   extern "C" \
   INTERCEPTOR_ATTRIBUTE \
   ret_type WRAP(func)(__VA_ARGS__)
+
+// We don't need INTERCEPTOR_WITH_SUFFIX on non-Darwin for now.
+#define INTERCEPTOR_WITH_SUFFIX(ret_type, func, ...) \
+  INTERCEPTOR(ret_type, func, __VA_ARGS__)
+
 #else  // __APPLE__
-#define INTERCEPTOR(ret_type, func, ...) \
-  extern "C" ret_type func(__VA_ARGS__); \
+
+#define INTERCEPTOR_ZZZ(suffix, ret_type, func, ...) \
+  extern "C" ret_type func(__VA_ARGS__) suffix; \
   extern "C" ret_type WRAP(func)(__VA_ARGS__); \
   INTERPOSER(func); \
   extern "C" INTERCEPTOR_ATTRIBUTE ret_type WRAP(func)(__VA_ARGS__)
 
+#define INTERCEPTOR(ret_type, func, ...) \
+  INTERCEPTOR_ZZZ(/*no symbol variants*/, ret_type, func, __VA_ARGS__)
+
+#define INTERCEPTOR_WITH_SUFFIX(ret_type, func, ...) \
+  INTERCEPTOR_ZZZ(__DARWIN_ALIAS_C(func), ret_type, func, __VA_ARGS__)
+
 // Override |overridee| with |overrider|.
 #define OVERRIDE_FUNCTION(overridee, overrider) \
   INTERPOSER_2(overridee, WRAP(overrider))
-- 
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