assembling first version

simulator_SIC_XE/include/code.h

@@ -3,6 +3,8 @@
 
 #include <vector>
 #include <memory>
+#include <unordered_map>
+#include <cstdint>
 
 #include "node.h"
 
@@ -17,8 +19,42 @@ public:
 
     const string toString() const;
 
+    // Two-pass assembler methods
+    void assemble();
+    std::vector<uint8_t> emitCode();
+    std::string emitText();
+    std::string dumpSymbols() const;
+    std::string dumpCode() const;
+
 private:
     std::vector<std::shared_ptr<Node>> _lines;
+    
+    // Assembler state
+    std::unordered_map<std::string, int> _symbolTable;
+    std::vector<int> _locationCounters;  // Location counter per line
+    int _startAddress = 0;
+    int _programLength = 0;
+    std::string _programName;
+    int _baseRegister = -1;  // -1 means not set
+
+    // Pass 1: build symbol table and assign addresses
+    void firstPass();
+    
+    // Pass 2: generate code
+    void secondPass();
+    
+    // Helper methods
+    int getInstructionLength(const std::shared_ptr<Node>& node, int locationCounter) const;
+    std::vector<uint8_t> generateInstruction(const InstructionNode* inst, int address);
+    std::vector<uint8_t> generateData(const DataNode* data);
+    
+    // Addressing mode selection
+    struct AddressingResult {
+        int nixbpe;  // ni, x, b, p, e bits
+        int displacement;  // 12-bit or 20-bit
+        bool success;
+    };
+    AddressingResult selectAddressingMode(int targetAddress, int pc, bool indexed, bool immediate, bool indirect, bool extended) const;
 };