cummulative fixes, RTL uuid trace, texture unit fixes, simx timing fixes

sim/common/mempool.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <stack>
+
+template <typename T>
+class MemoryPool {
+public:  
+  MemoryPool(uint32_t max_size) : max_size_(max_size) {}
+
+  MemoryPool(MemoryPool && other) 
+    : free_list_(std::move(other.free_list_)) 
+  {}
+
+  ~MemoryPool() {
+    this->flush();
+  }
+
+  void* allocate() {
+    void* mem;
+    if (!free_list_.empty()) {
+      mem = static_cast<void*>(free_list_.top());
+      free_list_.pop();
+    } else {
+      mem = ::operator new(sizeof(T));
+    }
+    return mem;
+  }
+
+  void deallocate(void * object) {
+    if (free_list_.size() < max_size_) {
+      free_list_.push(static_cast<T*>(object));
+    } else {
+      ::operator delete(object);
+    }
+  }
+
+  void flush() {
+    while (!free_list_.empty()) {
+      ::operator delete(free_list_.top());
+      free_list_.pop();
+    }
+  }
+
+private:
+  std::stack<void*> free_list_;
+  uint32_t max_size_;
+};