src: make ModifyCodeGenerationFromStrings more robust

1. Fallback to true when the context is not (yet) initialized with the kAllowCodeGenerationFromStrings field. 2. Fallback to true when the Environment isn't assigned to the context or when the Environment cannot call into JavaScript. PR-URL: #50763 Refs: #50761 Reviewed-By: Vinícius Lourenço Claro Cardoso <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Chengzhong Wu <[email protected]>

Author: joyeecheung

src/node_errors.cc

@@ -608,8 +608,18 @@ v8::ModifyCodeGenerationFromStringsResult ModifyCodeGenerationFromStrings(
 bool is_code_like){
  HandleScope scope(context->GetIsolate());
 
+if (context->GetNumberOfEmbedderDataFields() <=
+ ContextEmbedderIndex::kAllowCodeGenerationFromStrings){
+// The context is not (yet) configured by Node.js for this. We don't
+// have enough information to make a decision, just allow it which is
+// the default.
+return{true,{}};
+ }
  Environment* env = Environment::GetCurrent(context);
-if (env->source_maps_enabled()){
+if (env == nullptr){
+return{true,{}};
+ }
+if (env->source_maps_enabled() && env->can_call_into_js()){
 // We do not expect the maybe_cache_generated_source_map to throw any more
 // exceptions. If it does, just ignore it.
  errors::TryCatchScope try_catch(env);