From 1cf91676c1d0a5bd2c5c80b14d478645e8c1bb5e Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 17 Jun 2023 10:50:59 +0100
Subject: Throw error when local is missing

---
 .../org/shedlang/compiler/backends/llvm/LlvmCompilerContext.java  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/main/java')

diff --git a/src/main/java/org/shedlang/compiler/backends/llvm/LlvmCompilerContext.java b/src/main/java/org/shedlang/compiler/backends/llvm/LlvmCompilerContext.java
index d7d8c84d..60e6515b 100644
--- a/src/main/java/org/shedlang/compiler/backends/llvm/LlvmCompilerContext.java
+++ b/src/main/java/org/shedlang/compiler/backends/llvm/LlvmCompilerContext.java
@@ -78,7 +78,13 @@ public record LlvmCompilerContext(
     }
 
     public LlvmOperand local(String name) {
-        return locals.get(name);
+        var local = locals.get(name);
+        if (local == null) {
+            // TODO: better error
+            throw new RuntimeException("unrecognised local: " + name);
+        } else {
+            return local;
+        }
     }
 
     public LlvmCompilerContext addInstruction(LlvmInstruction instruction) {
-- 
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