Make sure to scan mmap'd memory regions for root pointers on OS X

Summary:
In the general case, we only need to check for root regions inside
the memory map returned by procmaps. However, on Darwin,
we also need to check inside mmap'd regions, which aren't returned
in the list of modules we get from procmaps.

This patch refactors memory region scanning on darwin to reduce
code duplication with the kernel alloc once page scan.

Reviewers: kubamracek, alekseyshl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32190

llvm-svn: 300760

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler-rt/lib/lsan/lsan_common.h b/compiler-rt/lib/lsan/lsan_common.h
index 88d5f1ca77d..121b9c08298 100644
--- a/compiler-rt/lib/lsan/lsan_common.h
+++ b/compiler-rt/lib/lsan/lsan_common.h
@@ -118,6 +118,15 @@ typedef InternalMmapVector<uptr> Frontier;
 void InitializePlatformSpecificModules();
 void ProcessGlobalRegions(Frontier *frontier);
 void ProcessPlatformSpecificAllocations(Frontier *frontier);
+
+struct RootRegion {
+  uptr begin;
+  uptr size;
+};
+
+InternalMmapVector<RootRegion> const *GetRootRegions();
+void ScanRootRegion(Frontier *frontier, RootRegion const &region,
+                    uptr region_begin, uptr region_end, uptr prot);
 // Run stoptheworld while holding any platform-specific locks.
 void DoStopTheWorld(StopTheWorldCallback callback, void* argument);