Propagate failures from VirtualMemory::Commit.

runtime/vm/pages.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/pages.h"
 
 #include "platform/assert.h"
 #include "vm/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ skipping 28 matching lines @@
 #if defined(TARGET_ARCH_MIPS) || defined(TARGET_ARCH_ARM64)
 DEFINE_FLAG(bool, concurrent_sweep, false,
             "Concurrent sweep for old generation.");
 #else  // TARGET_ARCH_MIPS || TARGET_ARCH_ARM64
 DEFINE_FLAG(bool, concurrent_sweep, true,
             "Concurrent sweep for old generation.");
 #endif  // TARGET_ARCH_MIPS || TARGET_ARCH_ARM64
 DEFINE_FLAG(bool, log_growth, false, "Log PageSpace growth policy decisions.");
 
 HeapPage* HeapPage::Initialize(VirtualMemory* memory, PageType type) {
+  ASSERT(memory != NULL);
   ASSERT(memory->size() > VirtualMemory::PageSize());
   bool is_executable = (type == kExecutable);
-  memory->Commit(is_executable);
-
+  if (!memory->Commit(is_executable)) {
+    return NULL;
+  }
   HeapPage* result = reinterpret_cast<HeapPage*>(memory->address());
+  ASSERT(result != NULL);
   result->memory_ = memory;
   result->next_ = NULL;
   result->executable_ = is_executable;
   return result;
 }
 
 
 HeapPage* HeapPage::Allocate(intptr_t size_in_words, PageType type) {
   VirtualMemory* memory =
       VerifiedMemory::Reserve(size_in_words << kWordSizeLog2);
   if (memory == NULL) {
     return NULL;
   }
-  return Initialize(memory, type);
+  HeapPage* result = Initialize(memory, type);
+  if (result == NULL) {
+    delete memory;  // Release reservation to OS.
+    return NULL;
+  }
+  return result;
 }
 
 
 void HeapPage::Deallocate() {
   // The memory for this object will become unavailable after the delete below.
   delete memory_;
 }
 
 
 void HeapPage::VisitObjects(ObjectVisitor* visitor) const {
@@ skipping 1050 matching lines @@
     return 0;
   } else {
     ASSERT(total_time >= gc_time);
     int result = static_cast<int>((static_cast<double>(gc_time) /
                                    static_cast<double>(total_time)) * 100);
     return result;
   }
 }
 
 }  // namespace dart