libsanitizer mege from upstream r171973

From-SVN: r195083

2 files changed, 30 insertions, 9 deletions

diff --git a/libsanitizer/include/sanitizer/asan_interface.h b/libsanitizer/include/sanitizer/asan_interface.h
index b94b303f3ac..47f780ceaa3 100644
--- a/libsanitizer/include/sanitizer/asan_interface.h
+++ b/libsanitizer/include/sanitizer/asan_interface.h
@@ -115,6 +115,15 @@ extern "C" {
   bool __asan_address_is_poisoned(void const volatile *addr)
       SANITIZER_INTERFACE_ATTRIBUTE;
 
+  // If at least on byte in [beg, beg+size) is poisoned, return the address
+  // of the first such byte. Otherwise return 0.
+  uptr __asan_region_is_poisoned(uptr beg, uptr size)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Print the description of addr (useful when debugging in gdb).
+  void __asan_describe_address(uptr addr)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
   // This is an internal function that is called to report an error.
   // However it is still a part of the interface because users may want to
   // set a breakpoint on this function in a debugger.
@@ -138,7 +147,7 @@ extern "C" {
   // User may provide function that would be called right when ASan detects
   // an error. This can be used to notice cases when ASan detects an error, but
   // the program crashes before ASan report is printed.
-  void __asan_on_error()
+  /* OPTIONAL */ void __asan_on_error()
       SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
 
   // User may provide its own implementation for symbolization function.
@@ -146,7 +155,8 @@ extern "C" {
   // "out_buffer". Description should be at most "out_size" bytes long.
   // User-specified function should return true if symbolization was
   // successful.
-  bool __asan_symbolize(const void *pc, char *out_buffer, int out_size)
+  /* OPTIONAL */ bool __asan_symbolize(const void *pc, char *out_buffer,
+                                       int out_size)
       SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
 
   // Returns the estimated number of bytes that will be reserved by allocator
@@ -186,20 +196,19 @@ extern "C" {
   void __asan_print_accumulated_stats()
       SANITIZER_INTERFACE_ATTRIBUTE;
 
-  // This function may be overriden by user to provide a string containing
-  // ASan runtime options. See asan_flags.h for details.
-  const char* __asan_default_options()
+  // This function may be optionally provided by user and should return
+  // a string containing ASan runtime options. See asan_flags.h for details.
+  /* OPTIONAL */ const char* __asan_default_options()
       SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
 
-  // Malloc hooks that may be overriden by user.
+  // Malloc hooks that may be optionally provided by user.
   // __asan_malloc_hook(ptr, size) is called immediately after
   //   allocation of "size" bytes, which returned "ptr".
   // __asan_free_hook(ptr) is called immediately before
   //   deallocation of "ptr".
-  // If user doesn't provide implementations of these hooks, they are no-op.
-  void __asan_malloc_hook(void *ptr, uptr size)
+  /* OPTIONAL */ void __asan_malloc_hook(void *ptr, uptr size)
       SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
-  void __asan_free_hook(void *ptr)
+  /* OPTIONAL */ void __asan_free_hook(void *ptr)
       SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
 }  // extern "C"
 
diff --git a/libsanitizer/include/sanitizer/common_interface_defs.h b/libsanitizer/include/sanitizer/common_interface_defs.h
index f6e814df6f5..9fba976a041 100644
--- a/libsanitizer/include/sanitizer/common_interface_defs.h
+++ b/libsanitizer/include/sanitizer/common_interface_defs.h
@@ -28,6 +28,12 @@
 # define SANITIZER_WEAK_ATTRIBUTE  __attribute__((weak))
 #endif
 
+#ifdef __linux__
+# define SANITIZER_SUPPORTS_WEAK_HOOKS 1
+#else
+# define SANITIZER_SUPPORTS_WEAK_HOOKS 0
+#endif
+
 // __has_feature
 #if !defined(__has_feature)
 # define __has_feature(x) 0
@@ -73,6 +79,12 @@ extern "C" {
   // stderr.
   void __sanitizer_set_report_fd(int fd)
       SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Notify the tools that the sandbox is going to be turned on. The reserved
+  // parameter will be used in the future to hold a structure with functions
+  // that the tools may call to bypass the sandbox.
+  void __sanitizer_sandbox_on_notify(void *reserved)
+      SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
 }  // extern "C"
 
 #endif  // SANITIZER_COMMON_INTERFACE_DEFS_H