cpu experimentation

src/spider/runtime/cpu/CPU.cpp

@@ -1,17 +1,110 @@
 #include "CPU.hpp"
 
+#include <spider/runtime/native/machine.hpp>
+
+#include <spider/runtime/memory/RAM.hpp>
+#include <spider/runtime/cpu/InstrReel.hpp>
+
+#if __cplusplus >= 202002L
+#include <bit>
+#endif
+
 namespace spider {
 
     CPU::CPU()
-    :   RA{}, RB{}, RC{}, RD{},
+        : RA{}, RB{}, RC{}, RD{},
         RX{}, RY{}, R0{}, R1{},
         R2{}, R3{}, R4{}, R5{},
         R6{}, R7{}, R8{}, R9{},
         RF{}, RI{}, RS{}, RZ{},
         RE{}, RN{}, RV{}, RM{},
-        ALU0{}, ALU1{}
-    {}
+        ALU0{}, ALU1{},
+        _ram(nullptr), _reel(nullptr) {
+    }
 
     CPU::~CPU() {}
 
+    // Setup & Configuration //
+
+    void CPU::hookRAM(RAM* ram) {
+        this->_ram = ram;
+    }
+
+    void CPU::hookInstrReel(InstrReel* reel) {
+        this->_reel = reel;
+    }
+
+    constexpr u64 CPU::getFlag(u64 mask) {
+        if (!mask) return 0;
+#if __cplusplus >= 202002L
+        return (RF & mask) >> std::countr_zero(mask);
+#elif defined(SPIDER_COMPILER_GCC_LIKE)
+        return (RF & mask) >> __builtin_ctzll(mask);
+#elif defined(SPIDER_COMPILER_MSVC)
+        return (RF & mask) >> _BitScanForward64(mask);
+#else
+        // If you have reached this part,
+        // please come up with a better alternative.
+        u64 bits = RF & mask;
+        while (mask && (mask >>= 1)) bits >>= 1;
+        return bits;
+#endif
+    }
+
+    // Addressing Modes //
+
+    /**
+     * Implied Addressing Mode
+     */
+    void CPU::imp() {
+        // Nothing //
+    }
+
+    /**
+     * Immediate Addressing Mode
+     */
+    void CPU::imm() {
+        u8 size = 2 << _size;
+        _next = &ALU0;
+    }
+
+    /**
+     * Absolute Addressing Mode
+     */
+    void CPU::abs() {
+        u8 size = 2 << getFlag(CPU::FLAG_MEMORY_MODE);
+    }
+
+    /**
+     * Register Addressing Mode
+     */
+    void CPU::reg() {
+        sizeof(CPU);
+    }
+
+    /**
+     * Indrect Addressing Mode
+     */
+    void CPU::ind() {}
+
+    /**
+     * Pointer Addressing Mode
+     */
+    void CPU::ptr() {}
+
+    /**
+     * Indexed Addressing Mode
+     */
+    void CPU::idx() {}
+
+    /**
+     * Scaled Addressing Mode
+     */
+    void CPU::sca() {}
+
+    /**
+     * Displaced Addressing Mode
+     */
+    void CPU::dis() {}
+
 }