first whack at passing evalState as an arg to debuggerHook.

src/libexpr/eval.cc

@@ -1044,7 +1044,7 @@ DebugTraceStacker::DebugTraceStacker(EvalState & evalState, DebugTrace t)
 {
     evalState.debugTraces.push_front(trace);
     if (evalState.debugStop && debuggerHook)
-        debuggerHook(nullptr, trace.env, trace.expr);
+        debuggerHook(evalState, nullptr, trace.env, trace.expr);
 }
 
 void Value::mkString(std::string_view s)

src/libexpr/eval.hh

@@ -136,7 +136,7 @@ public:
     void debugThrow(const E &error, const Env & env, const Expr & expr) const
     {
         if (debuggerHook)
-            debuggerHook(&error, env, expr);
+            debuggerHook(*this, &error, env, expr);
 
         throw error;
     }
@@ -150,7 +150,7 @@ public:
         // DebugTrace stack.
         if (debuggerHook && !debugTraces.empty()) {
             const DebugTrace & last = debugTraces.front();
-            debuggerHook(&e, last.env, last.expr);
+            debuggerHook(*this, &e, last.env, last.expr);
         }
 
         throw e;

src/libexpr/nixexpr.cc

@@ -10,7 +10,7 @@ namespace nix {
 
 /* Launch the nix debugger */
 
-std::function<void(const Error * error, const Env & env, const Expr & expr)> debuggerHook;
+std::function<void(const EvalState & evalState,const Error * error, const Env & env, const Expr & expr)> debuggerHook;
 
 /* Displaying abstract syntax trees. */
 

src/libexpr/nixexpr.hh

@@ -22,7 +22,7 @@ MakeError(UndefinedVarError, Error);
 MakeError(MissingArgumentError, EvalError);
 MakeError(RestrictedPathError, Error);
 
-extern std::function<void(const Error * error, const Env & env, const Expr & expr)> debuggerHook;
+extern std::function<void(const EvalState & evalState, const Error * error, const Env & env, const Expr & expr)> debuggerHook;
 
 /* Position objects. */
 

src/libexpr/primops.cc

@@ -765,7 +765,7 @@ static RegisterPrimOp primop_break({
             });
 
             auto & dt = state.debugTraces.front();
-            debuggerHook(&error, dt.env, dt.expr);
+            debuggerHook(state, &error, dt.env, dt.expr);
 
             if (state.debugQuit) {
                 // If the user elects to quit the repl, throw an exception.