add naive allocator for debugging (#140)

* add naive allocator only for debugging

* merge redundant api

---------

Co-authored-by: whjthu <haojie0429@gmail.com>

include/core/graph.h

@@ -64,7 +64,7 @@ class GraphObj : public Object {
 
     void optimize();
 
-    void dataMalloc();
+    void dataMalloc(bool useNaiveAllocator = false);
 
     /**
      * @brief Add an operator and create its outputs. Output tensor arguments

src/core/graph.cc

@@ -123,9 +123,19 @@ void GraphObj::optimize() {
     }
 }
 
-void GraphObj::dataMalloc() {
+void GraphObj::dataMalloc(bool useNaiveAllocator) {
     // topological sorting first
     IT_ASSERT(topo_sort() == true);
+    if (useNaiveAllocator) {
+        // used for debugging memory out-of-bounds access, tensors will not be
+        // released correctly
+        // note: behavior may not match running in non-naive mode, and it may
+        // not reproduce the bug
+        for (auto &tensor : tensors) {
+            tensor->dataMalloc();
+        }
+        return;
+    }
     // count the number of times all tensors are used
     std::unordered_map<TensorObj *, size_t> tensorToRefCount;
     // record the memory address offsets of all tensors to be allocated