When maximum space size flags are set, overwrite the resource constraints.

src/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #include "accessors.h"
 #include "api.h"
 #include "bootstrapper.h"
 #include "codegen.h"
@@ skipping 4996 matching lines @@
 
 // TODO(1236194): Since the heap size is configurable on the command line
 // and through the API, we should gracefully handle the case that the heap
 // size is not big enough to fit all the initial objects.
 bool Heap::ConfigureHeap(int max_semispace_size,
                          intptr_t max_old_gen_size,
                          intptr_t max_executable_size,
                          intptr_t code_range_size) {
   if (HasBeenSetUp()) return false;
 
+  // If max space size flags are specified overwrite the configuration.
+  if (FLAG_max_new_space_size > 0) {
+    max_semispace_size = FLAG_max_new_space_size * kLumpOfMemory;
+  }
+  if (FLAG_max_old_space_size > 0) {
+    max_old_gen_size = FLAG_max_old_space_size * kLumpOfMemory;
+  }
+  if (FLAG_max_executable_size > 0) {
+    max_executable_size = FLAG_max_executable_size * kLumpOfMemory;
+  }
+
   if (FLAG_stress_compaction) {
     // This will cause more frequent GCs when stressing.
     max_semispace_size_ = Page::kPageSize;
   }
 
   if (max_semispace_size > 0) {
     if (max_semispace_size < Page::kPageSize) {
       max_semispace_size = Page::kPageSize;
       if (FLAG_trace_gc) {
         PrintPID("Max semispace size cannot be less than %dkbytes\n",
@@ skipping 1465 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   OS::MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   OS::MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal