[profile] Add llvm_gcov_flush to be called outside a shared library

__gcov_flush is hidden.
For applications to dump profiling data of selected .so files,
they can use dlsym to find and call llvm_gcov_flush in each .so file.

Differential Revision: https://reviews.llvm.org/D45454


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@336019 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/profile/GCDAProfiling.c b/lib/profile/GCDAProfiling.c
index bb70ff0cf..68a0cab66 100644
--- a/lib/profile/GCDAProfiling.c
+++ b/lib/profile/GCDAProfiling.c
@@ -527,6 +527,10 @@ void llvm_register_flush_function(flush_fn fn) {
   }
 }
 
+// __gcov_flush is hidden. When called in a .so file,
+// it dumps profile data of the calling .so file.
+// If a main program needs to dump profile data of each linked
+// .so files, it should use dlsym to find and call llvm_gcov_flush.
 COMPILER_RT_VISIBILITY
 void __gcov_flush() {
   struct flush_fn_node *curr = flush_fn_head;
@@ -537,6 +541,12 @@ void __gcov_flush() {
   }
 }
 
+// llvm_gcov_flush is not hidden for a program to use dlsym to
+// find and call for any linked .so file.
+void llvm_gcov_flush() {
+  __gcov_flush();
+}
+
 COMPILER_RT_VISIBILITY
 void llvm_delete_flush_function_list(void) {
   while (flush_fn_head) {