use templates to only execute GDB stub related code if enabled

src/ARM.cpp

@@ -582,8 +582,10 @@ void ARM::CheckGdbIncoming()
     GdbCheckA();
 }
 
+template <CPUExecuteMode mode>
 void ARMv5::Execute()
 {
+    if constexpr (mode == CPUExecuteMode::InterpreterGDB)
         GdbCheckB();
 
     if (Halted)
@@ -606,9 +608,49 @@ void ARMv5::Execute()
     }
 
     while (NDS.ARM9Timestamp < NDS.ARM9Target)
+    {
+        if constexpr (mode == CPUExecuteMode::JIT)
+        {
+            u32 instrAddr = R[15] - ((CPSR&0x20)?2:4);
+
+            if ((instrAddr < FastBlockLookupStart || instrAddr >= (FastBlockLookupStart + FastBlockLookupSize))
+                && !NDS.JIT.SetupExecutableRegion(0, instrAddr, FastBlockLookup, FastBlockLookupStart, FastBlockLookupSize))
+            {
+                NDS.ARM9Timestamp = NDS.ARM9Target;
+                Log(LogLevel::Error, "ARMv5 PC in non executable region %08X\n", R[15]);
+                return;
+            }
+
+            JitBlockEntry block = NDS.JIT.LookUpBlock(0, FastBlockLookup,
+                instrAddr - FastBlockLookupStart, instrAddr);
+            if (block)
+                ARM_Dispatch(this, block);
+            else
+                NDS.JIT.CompileBlock(this);
+
+            if (StopExecution)
+            {
+                // this order is crucial otherwise idle loops waiting for an IRQ won't function
+                if (IRQ)
+                    TriggerIRQ();
+
+                if (Halted || IdleLoop)
+                {
+                    if ((Halted == 1 || IdleLoop) && NDS.ARM9Timestamp < NDS.ARM9Target)
+                    {
+                        Cycles = 0;
+                        NDS.ARM9Timestamp = NDS.ARM9Target;
+                    }
+                    IdleLoop = 0;
+                    break;
+                }
+            }
+        }
+        else
         {
             if (CPSR & 0x20) // THUMB
             {
+                if constexpr (mode == CPUExecuteMode::InterpreterGDB)
                     GdbCheckC();
 
                 // prefetch
@@ -624,6 +666,7 @@ void ARMv5::Execute()
             }
             else
             {
+                if constexpr (mode == CPUExecuteMode::InterpreterGDB)
                     GdbCheckC();
 
                 // prefetch
@@ -662,6 +705,8 @@ void ARMv5::Execute()
             }*/
             if (IRQ) TriggerIRQ();
 
+        }
+
         NDS.ARM9Timestamp += Cycles;
         Cycles = 0;
     }
@@ -669,77 +714,16 @@ void ARMv5::Execute()
     if (Halted == 2)
         Halted = 0;
 }
-
+template void ARMv5::Execute<CPUExecuteMode::Interpreter>();
+template void ARMv5::Execute<CPUExecuteMode::InterpreterGDB>();
 #ifdef JIT_ENABLED
-void ARMv5::ExecuteJIT()
+template void ARMv5::Execute<CPUExecuteMode::JIT>();
-{
-    if (Halted)
-    {
-        if (Halted == 2)
-        {
-            Halted = 0;
-        }
-        else if (NDS.HaltInterrupted(0))
-        {
-            Halted = 0;
-            if (NDS.IME[0] & 0x1)
-                TriggerIRQ();
-        }
-        else
-        {
-            NDS.ARM9Timestamp = NDS.ARM9Target;
-            return;
-        }
-    }
-
-    while (NDS.ARM9Timestamp < NDS.ARM9Target)
-    {
-        u32 instrAddr = R[15] - ((CPSR&0x20)?2:4);
-
-        if ((instrAddr < FastBlockLookupStart || instrAddr >= (FastBlockLookupStart + FastBlockLookupSize))
-            && !NDS.JIT.SetupExecutableRegion(0, instrAddr, FastBlockLookup, FastBlockLookupStart, FastBlockLookupSize))
-        {
-            NDS.ARM9Timestamp = NDS.ARM9Target;
-            Log(LogLevel::Error, "ARMv5 PC in non executable region %08X\n", R[15]);
-            return;
-        }
-
-        JitBlockEntry block = NDS.JIT.LookUpBlock(0, FastBlockLookup,
-            instrAddr - FastBlockLookupStart, instrAddr);
-        if (block)
-            ARM_Dispatch(this, block);
-        else
-            NDS.JIT.CompileBlock(this);
-
-        if (StopExecution)
-        {
-            // this order is crucial otherwise idle loops waiting for an IRQ won't function
-            if (IRQ)
-                TriggerIRQ();
-
-            if (Halted || IdleLoop)
-            {
-                if ((Halted == 1 || IdleLoop) && NDS.ARM9Timestamp < NDS.ARM9Target)
-                {
-                    Cycles = 0;
-                    NDS.ARM9Timestamp = NDS.ARM9Target;
-                }
-                IdleLoop = 0;
-                break;
-            }
-        }
-
-        NDS.ARM9Timestamp += Cycles;
-        Cycles = 0;
-    }
-
-    if (Halted == 2)
-        Halted = 0;
-}
 #endif
 
+template <CPUExecuteMode mode>
 void ARMv4::Execute()
 {
+    if constexpr (mode == CPUExecuteMode::InterpreterGDB)
         GdbCheckB();
 
     if (Halted)
@@ -763,95 +747,7 @@ void ARMv4::Execute()
 
     while (NDS.ARM7Timestamp < NDS.ARM7Target)
     {
-        if (CPSR & 0x20) // THUMB
+        if constexpr (mode == CPUExecuteMode::JIT)
-        {
-            GdbCheckC();
-
-            // prefetch
-            R[15] += 2;
-            CurInstr = NextInstr[0];
-            NextInstr[0] = NextInstr[1];
-            NextInstr[1] = CodeRead16(R[15]);
-
-            // actually execute
-            u32 icode = (CurInstr >> 6);
-            ARMInterpreter::THUMBInstrTable[icode](this);
-        }
-        else
-        {
-            GdbCheckC();
-
-            // prefetch
-            R[15] += 4;
-            CurInstr = NextInstr[0];
-            NextInstr[0] = NextInstr[1];
-            NextInstr[1] = CodeRead32(R[15]);
-
-            // actually execute
-            if (CheckCondition(CurInstr >> 28))
-            {
-                u32 icode = ((CurInstr >> 4) & 0xF) | ((CurInstr >> 16) & 0xFF0);
-                ARMInterpreter::ARMInstrTable[icode](this);
-            }
-            else
-                AddCycles_C();
-        }
-
-        // TODO optimize this shit!!!
-        if (Halted)
-        {
-            if (Halted == 1 && NDS.ARM7Timestamp < NDS.ARM7Target)
-            {
-                NDS.ARM7Timestamp = NDS.ARM7Target;
-            }
-            break;
-        }
-        /*if (NDS::IF[1] & NDS::IE[1])
-        {
-            if (NDS::IME[1] & 0x1)
-                TriggerIRQ();
-        }*/
-        if (IRQ) TriggerIRQ();
-
-        NDS.ARM7Timestamp += Cycles;
-        Cycles = 0;
-    }
-
-    if (Halted == 2)
-        Halted = 0;
-
-    if (Halted == 4)
-    {
-        assert(NDS.ConsoleType == 1);
-        auto& dsi = dynamic_cast<melonDS::DSi&>(NDS);
-        dsi.SoftReset();
-        Halted = 2;
-    }
-}
-
-#ifdef JIT_ENABLED
-void ARMv4::ExecuteJIT()
-{
-    if (Halted)
-    {
-        if (Halted == 2)
-        {
-            Halted = 0;
-        }
-        else if (NDS.HaltInterrupted(1))
-        {
-            Halted = 0;
-            if (NDS.IME[1] & 0x1)
-                TriggerIRQ();
-        }
-        else
-        {
-            NDS.ARM7Timestamp = NDS.ARM7Target;
-            return;
-        }
-    }
-
-    while (NDS.ARM7Timestamp < NDS.ARM7Target)
         {
             u32 instrAddr = R[15] - ((CPSR&0x20)?2:4);
 
@@ -886,6 +782,61 @@ void ARMv4::ExecuteJIT()
                     break;
                 }
             }
+        }
+        else
+        {
+            if (CPSR & 0x20) // THUMB
+            {
+                if constexpr (mode == CPUExecuteMode::InterpreterGDB)
+                    GdbCheckC();
+
+                // prefetch
+                R[15] += 2;
+                CurInstr = NextInstr[0];
+                NextInstr[0] = NextInstr[1];
+                NextInstr[1] = CodeRead16(R[15]);
+
+                // actually execute
+                u32 icode = (CurInstr >> 6);
+                ARMInterpreter::THUMBInstrTable[icode](this);
+            }
+            else
+            {
+                if constexpr (mode == CPUExecuteMode::InterpreterGDB)
+                    GdbCheckC();
+
+                // prefetch
+                R[15] += 4;
+                CurInstr = NextInstr[0];
+                NextInstr[0] = NextInstr[1];
+                NextInstr[1] = CodeRead32(R[15]);
+
+                // actually execute
+                if (CheckCondition(CurInstr >> 28))
+                {
+                    u32 icode = ((CurInstr >> 4) & 0xF) | ((CurInstr >> 16) & 0xFF0);
+                    ARMInterpreter::ARMInstrTable[icode](this);
+                }
+                else
+                    AddCycles_C();
+            }
+
+            // TODO optimize this shit!!!
+            if (Halted)
+            {
+                if (Halted == 1 && NDS.ARM7Timestamp < NDS.ARM7Target)
+                {
+                    NDS.ARM7Timestamp = NDS.ARM7Target;
+                }
+                break;
+            }
+            /*if (NDS::IF[1] & NDS::IE[1])
+            {
+                if (NDS::IME[1] & 0x1)
+                    TriggerIRQ();
+            }*/
+            if (IRQ) TriggerIRQ();
+        }
 
         NDS.ARM7Timestamp += Cycles;
         Cycles = 0;
@@ -902,6 +853,11 @@ void ARMv4::ExecuteJIT()
         Halted = 2;
     }
 }
+
+template void ARMv4::Execute<CPUExecuteMode::Interpreter>();
+template void ARMv4::Execute<CPUExecuteMode::InterpreterGDB>();
+#ifdef JIT_ENABLED
+template void ARMv4::Execute<CPUExecuteMode::JIT>();
 #endif
 
 void ARMv5::FillPipeline()

src/ARM.h

@@ -43,6 +43,15 @@ enum
     RWFlags_ForceUser = (1<<21),
 };
 
+enum class CPUExecuteMode : u32
+{
+    Interpreter,
+    InterpreterGDB,
+#ifdef JIT_ENABLED
+    JIT
+#endif
+};
+
 struct GDBArgs;
 class ARMJIT;
 class GPU;
@@ -75,10 +84,6 @@ public:
     }
 
     void NocashPrint(u32 addr) noexcept;
-    virtual void Execute() = 0;
-#ifdef JIT_ENABLED
-    virtual void ExecuteJIT() = 0;
-#endif
 
     bool CheckCondition(u32 code) const
     {
@@ -241,10 +246,8 @@ public:
     void PrefetchAbort();
     void DataAbort();
 
-    void Execute() override;
+    template <CPUExecuteMode mode>
-#ifdef JIT_ENABLED
+    void Execute();
-    void ExecuteJIT() override;
-#endif
 
     // all code accesses are forced nonseq 32bit
     u32 CodeRead32(u32 addr, bool branch);
@@ -383,10 +386,8 @@ public:
 
     void JumpTo(u32 addr, bool restorecpsr = false) override;
 
-    void Execute() override;
+    template <CPUExecuteMode mode>
-#ifdef JIT_ENABLED
+    void Execute();
-    void ExecuteJIT() override;
-#endif
 
     u16 CodeRead16(u32 addr)
     {

src/NDS.cpp

@@ -107,6 +107,9 @@ NDS::NDS(NDSArgs&& args, int type, void* userdata) noexcept :
     AREngine(*this),
     ARM9(*this, args.GDB, args.JIT.has_value()),
     ARM7(*this, args.GDB, args.JIT.has_value()),
+#ifdef GDBSTUB_ENABLED
+    EnableGDBStub(args.GDB.has_value()),
+#endif
 #ifdef JIT_ENABLED
     EnableJIT(args.JIT.has_value()),
 #endif
@@ -886,7 +889,7 @@ void NDS::RunSystemSleep(u64 timestamp)
     }
 }
 
-template <bool EnableJIT>
+template <CPUExecuteMode cpuMode>
 u32 NDS::RunFrame()
 {
     FrameStartTimestamp = SysTimestamp;
@@ -926,9 +929,12 @@ u32 NDS::RunFrame()
                 GPU.BlankFrame();
         }
         else
+        {
+            if (cpuMode == CPUExecuteMode::InterpreterGDB)
             {
                 ARM9.CheckGdbIncoming();
                 ARM7.CheckGdbIncoming();
+            }
 
             if (!(CPUStop & CPUStop_Wakeup))
             {
@@ -963,12 +969,7 @@ u32 NDS::RunFrame()
                 }
                 else
                 {
-#ifdef JIT_ENABLED
+                    ARM9.Execute<cpuMode>();
-                    if (EnableJIT)
-                        ARM9.ExecuteJIT();
-                    else
-#endif
-                        ARM9.Execute();
                 }
 
                 RunTimers(0);
@@ -995,12 +996,7 @@ u32 NDS::RunFrame()
                     }
                     else
                     {
-#ifdef JIT_ENABLED
+                        ARM7.Execute<cpuMode>();
-                        if (EnableJIT)
-                            ARM7.ExecuteJIT();
-                        else
-#endif
-                            ARM7.Execute();
                     }
 
                     RunTimers(1);
@@ -1045,10 +1041,18 @@ u32 NDS::RunFrame()
 {
 #ifdef JIT_ENABLED
     if (EnableJIT)
-        return RunFrame<true>();
+        return RunFrame<CPUExecuteMode::JIT>();
     else
 #endif
-        return RunFrame<false>();
+#ifdef GDBSTUB_ENABLED
+    if (EnableGDBStub)
+    {
+        return RunFrame<CPUExecuteMode::InterpreterGDB>();
+    } else
+#endif
+    {
+        return RunFrame<CPUExecuteMode::Interpreter>();
+    }
 }
 
 void NDS::Reschedule(u64 target)

src/NDS.h

@@ -228,6 +228,9 @@ private:
 #ifdef JIT_ENABLED
     bool EnableJIT;
 #endif
+#ifdef GDBSTUB_ENABLED
+    bool EnableGDBStub = false;
+#endif
 
 public: // TODO: Encapsulate the rest of these members
     void* UserData;
@@ -522,8 +525,9 @@ private:
     void SetWifiWaitCnt(u16 val);
     void SetGBASlotTimings();
     void EnterSleepMode();
-    template <bool EnableJIT>
+    template <CPUExecuteMode cpuMode>
     u32 RunFrame();
+
 public:
     NDS(NDSArgs&& args, void* userdata = nullptr) noexcept : NDS(std::move(args), 0, userdata) {}
     NDS() noexcept;