Make the debugger a global object.

debugger/debugger.cpp

@@ -22,6 +22,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <cpu/ppc/ppcdisasm.h>
 #include <cpu/ppc/ppcemu.h>
 #include <cpu/ppc/ppcmmu.h>
+#include <debugger/debugger.h>
 #include <devices/common/hwinterrupt.h>
 #include <devices/common/ofnvram.h>
 #include "memaccess.h"
@@ -445,7 +446,11 @@ static void delete_prompt() {
 #endif
 }
 
-void enter_debugger() {
+DppcDebugger::DppcDebugger() {
+
+}
+
+void DppcDebugger::enter_debugger() {
     string inp, cmd, addr_str, expr_str, reg_expr, last_cmd, reg_value_str,
            inst_string, inst_num_str, profile_name, sub_cmd;
     uint32_t addr, inst_grab;

debugger/debugger.h

@@ -22,6 +22,22 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #ifndef DEBUGGER_H_
 #define DEBUGGER_H_
 
-void enter_debugger();
+#include <memory>
+
+class DppcDebugger {
+public:
+    static DppcDebugger* get_instance() {
+        if (!debugger_obj) {
+            debugger_obj = std::unique_ptr<DppcDebugger>(new DppcDebugger());
+        }
+        return debugger_obj.get();
+    };
+
+    void enter_debugger();
+
+private:
+    inline static std::unique_ptr<DppcDebugger> debugger_obj{nullptr};
+    explicit DppcDebugger(); // private constructor to implement a singleton
+};
 
 #endif    // DEBUGGER_H_

main.cpp

@@ -208,7 +208,7 @@ int main(int argc, char** argv) {
         // sent to the logfile only).
         cerr << message.preamble << message.indentation << message.prefix << message.message << endl;
         power_off_reason = po_enter_debugger;
-        enter_debugger();
+        DppcDebugger::get_instance()->enter_debugger();
 
         // Ensure that NVRAM and other state is persisted before we terminate.
         delete gMachineObj.release();
@@ -282,15 +282,15 @@ void run_machine(std::string machine_str, std::string bootrom_path, uint32_t exe
     switch (execution_mode) {
     case interpreter:
         power_off_reason = po_starting_up;
-        enter_debugger();
+        DppcDebugger::get_instance()->enter_debugger();
         break;
     case threaded_int:
         power_off_reason = po_starting_up;
-        enter_debugger();
+        DppcDebugger::get_instance()->enter_debugger();
         break;
     case debugger:
         power_off_reason = po_enter_debugger;
-        enter_debugger();
+        DppcDebugger::get_instance()->enter_debugger();
         break;
     default:
         LOG_F(ERROR, "Invalid EXECUTION MODE");