From ebddf6cca0abd98b3c24e8262ff4411bdbe884e8 Mon Sep 17 00:00:00 2001
From: MerryMage <MerryMage@users.noreply.github.com>
Date: Thu, 28 May 2020 20:39:50 +0100
Subject: [PATCH] basic_block: Allow printing of invalid instruction pointers

---
 src/frontend/ir/basic_block.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/frontend/ir/basic_block.cpp b/src/frontend/ir/basic_block.cpp
index 421e48fe..b7615f52 100644
--- a/src/frontend/ir/basic_block.cpp
+++ b/src/frontend/ir/basic_block.cpp
@@ -176,7 +176,10 @@ std::string DumpBlock(const IR::Block& block) {
         if (arg.IsEmpty()) {
             return "<null>";
         } else if (!arg.IsImmediate()) {
-            return fmt::format("%{}", inst_to_index.at(arg.GetInst()));
+            if (const auto iter = inst_to_index.find(arg.GetInst()); iter != inst_to_index.end()) {
+                return fmt::format("%{}", iter->second);
+            }
+            return fmt::format("%<unknown inst {:016x}>", reinterpret_cast<u64>(arg.GetInst()));
         }
         switch (arg.GetType()) {
         case Type::U1: