[PATCH] [lsan] Add an interface function for on-demand leak checking.

[Sergey Matveev]

In http://reviews.llvm.org/D9159#159457, @samsonov wrote:

> Leaking symbolization is an issue... Let me know if you want to investigate it, or delegate it to me.


Fixed in r235411


================
Comment at: include/sanitizer/lsan_interface.h:61
@@ +60,3 @@
+  // affected by them.
+  int __lsan_do_extra_leak_check();
+
----------------
samsonov wrote:
> Bikeshedding suggestion from me:
>   __lsan_do_recoverable_leak_check()
I'll have to give this another thought before landing.

================
Comment at: lib/lsan/lsan_common.cc:333
@@ +332,3 @@
+static void ResetTagsCb(uptr chunk, void *arg) {
+  chunk = GetUserBegin(chunk);
+  LsanMetadata m(chunk);
----------------
samsonov wrote:
> Add
>   void(arg)
> to defeat unused-variable warning?
done

================
Comment at: lib/lsan/lsan_common.cc:443
@@ -426,1 +442,3 @@
+  bool have_leaks = CheckForLeaks();
+  if (have_leaks) {
     if (flags()->exitcode) {
----------------
samsonov wrote:
>   if (!have_leaks)
>     return;
>   <more code>
> 
done

http://reviews.llvm.org/D9159

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