Add "iter" state

ConflictSet.cpp

@@ -3040,6 +3040,7 @@ struct CheckJob {
 namespace check_point_read_state_machine {
 
 CheckJob::continuation down_left_spine(CheckJob *job);
+CheckJob::continuation iter(CheckJob *job);
 
 // Logically this is the same as performing firstGeq and then checking against
 // point or range version according to cmp, but this version short circuits as
@@ -3049,7 +3050,10 @@ CheckJob::continuation begin(CheckJob *job) {
 #if DEBUG_VERBOSE && !defined(NDEBUG)
   fprintf(stderr, "Check point read: %s\n", printable(key).c_str());
 #endif
-  for (;; ++job->tls->point_read_iterations_accum) {
+  return iter(job);
+}
+
+CheckJob::continuation iter(CheckJob *job) {
   if (job->begin.size() == 0) {
     if (job->n->entryPresent) {
       job->setResult(job->n->entry.pointVersion <= job->readVersion);
@@ -3080,8 +3084,8 @@ CheckJob::continuation begin(CheckJob *job) {
 
   if (job->n->partialKeyLen > 0) {
     int commonLen = std::min<int>(job->n->partialKeyLen, job->begin.size());
-      int i = longestCommonPrefix(job->n->partialKey(), job->begin.data(),
-                                  commonLen);
+    int i =
+        longestCommonPrefix(job->n->partialKey(), job->begin.data(), commonLen);
     if (i < commonLen) {
       auto c = job->n->partialKey()[i] <=> job->begin[i];
       if (c > 0) {
@@ -3097,8 +3101,7 @@ CheckJob::continuation begin(CheckJob *job) {
     }
     if (commonLen == job->n->partialKeyLen) {
       // partial key matches
-        job->begin =
-            job->begin.subspan(commonLen, job->begin.size() - commonLen);
+      job->begin = job->begin.subspan(commonLen, job->begin.size() - commonLen);
     } else if (job->n->partialKeyLen > int(job->begin.size())) {
       // n is the first physical node greater than remaining, and there's no
       // eq node
@@ -3111,7 +3114,9 @@ CheckJob::continuation begin(CheckJob *job) {
     job->setResult(true);
     return nullptr; // Done
   }
-  }
+
+  ++job->tls->point_read_iterations_accum;
+  return iter;
 }
 
 CheckJob::continuation down_left_spine(CheckJob *job) {