opindex interface to memory

src/cpu/ctfe_d6502.d

@@ -1053,7 +1053,7 @@ string ReadOp(string var)
 
 string ReadRaw(string addr)
 {
-    return Attr("memory") ~ ".read(" ~ addr ~")";
+    return Attr("memory") ~ "[" ~ addr ~"]";
 }
 
 string ReadWordBasic(string type, string var, string addr1, string addr2)
@@ -1106,20 +1106,20 @@ string Tick()
 string Peek(string addr)
 {
     return Tick() ~
-           If!(strict)(Attr("memory") ~ ".read(" ~ addr ~");\n");
+           If!(strict)(Attr("memory") ~ "[" ~ addr ~ "];\n");
 }
 
 string Poke(string addr, string val)
 {
     return Tick() ~
            If!(strict)(
-               Attr("memory") ~ ".write(" ~ addr ~ ", " ~ val ~ ");\n");
+               Attr("memory") ~ "[" ~ addr ~ "] = " ~ val ~ ";\n");
 }
 
 string Write(string addr, string val)
 {
     return Tick() ~
-           Attr("memory") ~ ".write(" ~ addr ~ ", " ~ val ~ ");\n";
+           Attr("memory") ~ "[" ~ addr ~ "] = " ~ val ~ ";\n";
 }
 
 string IncPC()

src/cpu/d6502.d

@@ -81,8 +81,8 @@ public:
 final class Cpu(string chip, MEM, CLK)
 if (__traits(compiles, {
     MEM m; ubyte val; ushort addr;
-    val = m.read(addr);
-    m.write(addr, val);
+    val = m[addr];
+    m[addr] = val;
     CLK c; int cycles;
     version(Cumulative) c.tick(cycles);
     else c.tick();
@@ -166,7 +166,7 @@ if (__traits(compiles, {
             static if (_chip == "6502") { idelay = ndelay = false; }
             version(Cumulative) { cycles = 1; }
             else { clock.tick(); }
-            opcode = memory.read(PC++);
+            opcode = memory[PC++];
             mixin(OpExecute(_chip));
         } while (keepRunning);
     }

test/d6502/benchmark.d

@@ -13,7 +13,7 @@ final class BreakRunner
         this.mem = &mem;
     }
 
-    final ubyte read(ushort addr)
+    final ubyte opIndex(ushort addr)
     {
         if (addr == 0xfffe)
         {
@@ -27,9 +27,10 @@ final class BreakRunner
         else return mem.read(addr);
     }
 
-    final void write(ushort addr, ubyte val)
+    final ubyte opIndexAssign(ubyte val, ushort addr)
     {
         mem.write(addr, val);
+        return val;
     }
 
     static if (cumulative) { final void tick(int) {} }

test/d6502/cpu.d

@@ -35,10 +35,7 @@ template isCMOS(T)
 class TestIO
 {
     ubyte delegate(ushort) dread;
-    ubyte read(ushort addr) { return dread(addr); }
-
     void delegate(ushort, ubyte) dwrite;
-    void write(ushort addr, ubyte val) { dwrite(addr, val); }
 
     static if (cumulative)
     {
@@ -50,6 +47,19 @@ class TestIO
         void delegate() dtick;
         void tick() { dtick(); }
     }
+
+    ubyte opIndex(ushort i1) const
+    {
+        auto addr = cast(ushort)i1;
+        return dread(addr);
+    }
+
+    ubyte opIndexAssign(ubyte val, ushort i1)
+    {
+        auto addr = cast(ushort)i1;
+        dwrite(addr, val);
+        return val;
+    }
 }