Trying out a new style of JIT pattern matching.

src/alloy/hir/block.cc

@@ -0,0 +1,39 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <alloy/hir/block.h>
+
+#include <alloy/hir/instr.h>
+
+using namespace alloy;
+using namespace alloy::hir;
+
+
+void Block::AssertNoCycles() {
+  Instr* hare = instr_head;
+  Instr* tortoise = instr_head;
+  if (!hare) {
+    return;
+  }
+  while (hare = hare->next) {
+    if (hare == tortoise) {
+      // Cycle!
+      XEASSERTALWAYS();
+    }
+    hare = hare->next;
+    if (hare == tortoise) {
+      // Cycle!
+      XEASSERTALWAYS();
+    }
+    tortoise = tortoise->next;
+    if (!hare || !tortoise) {
+      return;
+    }
+  }
+}