VM: Tell lsan about mmap()ed regions used for our heap

runtime/vm/pages.cc

Index: runtime/vm/pages.cc
diff --git a/runtime/vm/pages.cc b/runtime/vm/pages.cc
index 6d959cda750bbb4a5311767f88289a3669522e83..930727aeab7724dec12e7e89f8dca71c3abde2e6 100644
--- a/runtime/vm/pages.cc
+++ b/runtime/vm/pages.cc
@@ -5,6 +5,7 @@
 #include "vm/pages.h"
 
 #include "platform/assert.h"
+#include "platform/address_sanitizer.h"

[zra, 2017/01/23 16:58:58]

DBC: alphabetize.

 #include "vm/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ -69,6 +70,10 @@ HeapPage* HeapPage::Initialize(VirtualMemory* memory, PageType type) {
   result->memory_ = memory;
   result->next_ = NULL;
   result->type_ = type;
+
+  LSAN_REGISTER_ROOT_REGION(memory->address(),
+                            static_cast<size_t>(memory->size()));
+
   return result;
 }
 
@@ -89,6 +94,9 @@ HeapPage* HeapPage::Allocate(intptr_t size_in_words, PageType type) {
 
 
 void HeapPage::Deallocate() {
+  LSAN_UNREGISTER_ROOT_REGION(memory_->address(),
+                              static_cast<size_t>(memory_->size()));
+
   // The memory for this object will become unavailable after the delete below.
   delete memory_;
 }