ram: add PDN strap pitch vs die size error check in ramPdngen() to prevent segfault

src/ram/src/ram.cpp

@@ -465,6 +465,28 @@ void RamGen::ramPdngen(const char* power_pin,
                        int hor_width,
                        int hor_pitch)
 {
+  const odb::Rect& die = block_->getDieArea();
+  const double dbu_per_um = block_->getDb()->getDbuPerMicron();
+
+  if (die.dy() < hor_pitch) {
+    logger_->error(RAM,
+                   31,
+                   "Die height ({:.2f} um) is less than horizontal strap pitch "
+                   "({:.2f} um). "
+                   "Use a smaller -hor_layer pitch.",
+                   die.dy() / dbu_per_um,
+                   hor_pitch / dbu_per_um);
+  }
+  if (die.dx() < ver_pitch) {
+    logger_->error(
+        RAM,
+        32,
+        "Die width ({:.2f} um) is less than vertical strap pitch ({:.2f} um). "
+        "Use a smaller -ver_layer pitch.",
+        die.dx() / dbu_per_um,
+        ver_pitch / dbu_per_um);
+  }
+
   // need parameters for power and ground nets
   auto power_net = dbNet::create(block_, "VDD");
   auto ground_net = dbNet::create(block_, "VSS");