fix(furvm): add JustHit executor flag

furvm/include/furvm/executor.hpp

@@ -14,6 +14,8 @@ namespace furvm {
 enum class executor_flags : std::uint32_t {
     Suspended = (1 << 0), /**< Execution suspended. */
     Done      = (1 << 1), /**< Execution is finished. */
+
+    JustHit = (1 << 16), /**< Executor just hit a breakpoint. */
 };
 
 static inline executor_flags operator|(executor_flags lhs, executor_flags rhs) {
@@ -34,6 +36,8 @@ private:
     executor(context* context)
       : m_context(context) {}
 public:
+    static constexpr executor_flags STATE_FLAGS = executor_flags::JustHit;
+
     using new_frame_callback = std::function<void(executor&)>;
 public:
     /**
@@ -90,7 +94,10 @@ public:
 
     void unsuspend() { m_flags = m_flags & ~executor_flags::Suspended; }
 
-    void clear_flags() { m_flags = m_frames.empty() ? executor_flags::Done : furvm::executor_flags{ 0 }; }
+    void clear_flags() {
+        m_flags = m_flags & STATE_FLAGS;
+        m_flags = m_frames.empty() ? executor_flags::Done : furvm::executor_flags{ 0 };
+    }
 public:
     /**
      * @brief Pushes a new frame.

furvm/src/executor.cpp

@@ -110,6 +110,7 @@ void executor::push_frame(const mod_h& mod, function function) {
     } else {
         m_flags = m_flags | executor_flags::Done;
     }
+    m_flags = m_flags & ~executor_flags::JustHit;
 }
 
 struct executor::frame executor::pop_frame() {
@@ -129,6 +130,7 @@ struct executor::frame executor::pop_frame() {
     } else {
         m_flags = m_flags | executor_flags::Done;
     }
+    m_flags = m_flags & ~executor_flags::JustHit;
 
     return frame;
 }
@@ -189,12 +191,13 @@ void executor::step() {
 
     struct frame& frame = m_frames.top();
 
-    if (frame.mod->has_breakpoint(frame.position)) {
-        m_flags        = m_flags | executor_flags::Suspended;
+    if ((m_flags & executor_flags::JustHit) != executor_flags::JustHit && frame.mod->has_breakpoint(frame.position)) {
+        m_flags        = m_flags | executor_flags::Suspended | executor_flags::JustHit;
         const auto& bp = frame.mod->breakpoint_at(frame.position);
         bp.callback(*this, bp.data);
         return;
     }
+    m_flags = m_flags & ~executor_flags::JustHit;
 
     instruction instr{};
     frame.position += instr.read(frame.mod->bytecode_view().subview(frame.position));