[asancov] Write coverage directly to a memory-mapped file.

This way does not require a __sanitizer_cov_dump() call. That's
important on Android, where apps can be killed at arbitrary time.

We write raw PCs to disk instead of module offsets; we also write
memory layout to a separate file. This increases dump size by the
factor of 2 on 64-bit systems.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209653 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_common_libcdep.cc b/lib/sanitizer_common/sanitizer_common_libcdep.cc
index b70414479..e4b2d7600 100644
--- a/lib/sanitizer_common/sanitizer_common_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -41,4 +41,17 @@ bool ColorizeReports() {
   return internal_strcmp(flag, "always") == 0 ||
          (internal_strcmp(flag, "auto") == 0 && PrintsToTtyCached());
 }
+
+static void (*sandboxing_callback)();
+void SetSandboxingCallback(void (*f)()) {
+  sandboxing_callback = f;
+}
+
 }  // namespace __sanitizer
+
+void NOINLINE
+__sanitizer_sandbox_on_notify(__sanitizer_sandbox_arguments *args) {
+  PrepareForSandboxing(args);
+  if (sandboxing_callback)
+    sandboxing_callback();
+}