From e03ee8b12b23e1ac2d8007aa421ddd67e3ff2b09 Mon Sep 17 00:00:00 2001
From: lvntky <klevent1903@gmail.com>
Date: Sun, 23 Jun 2024 12:32:30 +0300
Subject: [PATCH] [feature] mroe opcodes

---
 src/execute_engine/cvm_execute.cpp | 50 +++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 8 deletions(-)

diff --git a/src/execute_engine/cvm_execute.cpp b/src/execute_engine/cvm_execute.cpp
index 08dfe9a..85c2f22 100644
--- a/src/execute_engine/cvm_execute.cpp
+++ b/src/execute_engine/cvm_execute.cpp
@@ -30,6 +30,33 @@ void validateByteCode(const uint8_t* byteCode) {
   }
 }
 
+std::string printOperandStack(std::vector<int> osp) {
+  std::string osStr = "[";
+  for (size_t i = 0; i < osp.size(); i++) {
+    osStr += std::to_string(osp.at(i));
+    if (i != osp.size() - 1) {
+      osStr += ", ";
+    }
+  }
+  osStr += "]";
+  return osStr;
+}
+
+void pushOperandStack(std::stack<int>& operandStack,
+                      std::vector<int>& operandStackPrint, int value) {
+  operandStack.push(value);
+  operandStackPrint.push_back(value);
+}
+
+int popOperandStack(std::stack<int>& operandStack,
+                    std::vector<int> operandStackPrint) {
+  int value = operandStack.top();
+  operandStack.pop();
+
+  operandStackPrint.pop_back();
+
+  return value;
+}
 /**
  * Helper methods ends
  */
@@ -83,6 +110,8 @@ const uint8_t* CVM::getByteCode(const Classfile& cf,
 void CVM::interprete(const uint8_t* byteCode, const Classfile& cf) {
   size_t pc = 0;
   std::stack<int> operandStack;
+  std::vector<int>
+      operandStackPrint;  // for printing elements of original operandStack
 
   while (pc < codeLength) {
     uint8_t opcode = byteCode[pc++];
@@ -91,18 +120,23 @@ void CVM::interprete(const uint8_t* byteCode, const Classfile& cf) {
         spdlog::info("==> Opcode: {:#X} - NOP - DO NOTHING", opcode);
         break;
       case 0x2:
-        operandStack.push(-1);
+        pushOperandStack(operandStack, operandStackPrint, -1);
         spdlog::info(
-            "==> Opcode {:#X} - iconst_m1 - Load m1 to the operand stack: "
-            "<TOP: {}>",
-            opcode, operandStack.top());
+            "==> Opcode {:#X} - iconst_m1 - Load m1 to the operand stack: {}",
+            opcode, printOperandStack(operandStackPrint));
         break;
       case 0x3:
-        operandStack.push(0);
+        pushOperandStack(operandStack, operandStackPrint, 0);
+
+        spdlog::info(
+            "==> Opcode {:#X} - iconst_0 - Load 0 to the operand stack: {}",
+            opcode, printOperandStack(operandStackPrint));
+        break;
+      case 0x4:
+        pushOperandStack(operandStack, operandStackPrint, 1);
         spdlog::info(
-            "==> Opcode {:#X} - iconst_0 - Load 0 to the operand stack: <TOP: "
-            "{}>",
-            opcode, operandStack.top());
+            "==> Opcode {:#X} - iconst_1 - Load 1 to the operand stack: {}",
+            opcode, printOperandStack(operandStackPrint));
         break;
       default:
         spdlog::error("Unknown Opcode: {:#x} at PC: {}", opcode, pc);