dlmalloc does not fail when it runs out of memory...

src/xenia/cpu/xenon_memory.cc

@@ -508,6 +508,7 @@ uint64_t XenonMemoryHeap::Alloc(
       space_,
       alignment,
       alloc_size + heap_guard_size * 2);
+  assert_true(reinterpret_cast<uint64_t>(p) <= 0xFFFFFFFFFull);
   if (FLAGS_heap_guard_pages) {
     size_t real_size = mspace_usable_size(p);
     DWORD old_protect;

src/xenia/cpu/xenon_thread_state.cc

@@ -24,6 +24,7 @@ XenonThreadState::XenonThreadState(XenonRuntime* runtime, uint32_t thread_id,
       stack_size_(stack_size),
       thread_state_address_(thread_state_address) {
   stack_address_ = memory_->HeapAlloc(0, stack_size, MEMORY_FLAG_ZERO);
+  assert_not_zero(stack_address_);
 
   // Allocate with 64b alignment.
   context_ = (PPCContext*)xe_malloc_aligned(sizeof(PPCContext));