Prepare operand stack in interpreter (#5015)

Prepare operand stack in interpreter to save prepared operands to use

Signed-off-by: Hyeongseok Oh <hseok82.oh@samsung.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/runtimes/neurun/core/src/exec/interp/Interpreter.cc b/runtimes/neurun/core/src/exec/interp/Interpreter.cc
index 5504e957d..536b19cf0 100644
--- a/runtimes/neurun/core/src/exec/interp/Interpreter.cc
+++ b/runtimes/neurun/core/src/exec/interp/Interpreter.cc
@@ -16,6 +16,9 @@
 
 #include "Interpreter.h"
 
+#include <stack>
+
+#include "model/operand/IndexMap.h"
 #include "util/logging.h"
 
 namespace neurun
@@ -29,6 +32,32 @@ void Interpreter::run()
 {
   VERBOSE(INTERPRETER) << "Interpreter is invoked " << std::endl;
 
+  // operand_stack: save operands prepared to use
+  std::stack<model::operand::Index> operand_stack;
+
+  // Note: We should push input first, then constant.
+  //       We use use-def for find operators ready to execution,
+  //       but Use-Def cannot handle parameters (maybe constant, but not always)
+  // Note: If all model inputs are constant, it may not work (depend on tensors' order).
+  //       But that scenario may not exist
+  for (auto ind : _env->model().inputs)
+  {
+    VERBOSE(INTERPRETER) << "Input: Push to operand stack " << ind.value() << std::endl;
+
+    operand_stack.push(ind);
+  }
+
+  _env->model().operands.iterate(
+      [&](const model::operand::Index &ind, const model::operand::Object &obj) {
+        if (obj.hasData())
+        {
+          VERBOSE(INTERPRETER) << "Constant: Push to operand stack " << ind.value() << std::endl;
+
+          operand_stack.push(ind);
+        }
+      });
+
+  // Execution
   throw std::runtime_error("NYI: interpreter run");
 }