More plumbing for breakpoints.

src/alloy/runtime/function.h

@@ -17,6 +17,7 @@
 namespace alloy {
 namespace runtime {
 
+class Breakpoint;
 class FunctionInfo;
 class ThreadState;
 
@@ -38,15 +39,24 @@ public:
   DebugInfo* debug_info() const { return debug_info_; }
   void set_debug_info(DebugInfo* debug_info) { debug_info_ = debug_info; }
 
+  int AddBreakpoint(Breakpoint* breakpoint);
+  int RemoveBreakpoint(Breakpoint* breakpoint);
+
   int Call(ThreadState* thread_state, uint64_t return_address);
 
 protected:
+  virtual int AddBreakpointImpl(Breakpoint* breakpoint) { return 0; }
+  virtual int RemoveBreakpointImpl(Breakpoint* breakpoint) { return 0; }
   virtual int CallImpl(ThreadState* thread_state, uint64_t return_address) = 0;
 
 protected:
   Type        type_;
   uint64_t    address_;
   DebugInfo*  debug_info_;
+
+  // TODO(benvanik): move elsewhere? DebugData?
+  Mutex*      lock_;
+  std::vector<Breakpoint*> breakpoints_;
 };