Avoid silently dropping instructions when generating LLVM code

1 files changed, 3 insertions, 1 deletions

diff --git a/src/main/java/org/shedlang/compiler/backends/llvm/codegen/PatioToLlvmFunctionContext.java b/src/main/java/org/shedlang/compiler/backends/llvm/codegen/PatioToLlvmFunctionContext.java
index 18e46e3c..c27beec6 100644
--- a/src/main/java/org/shedlang/compiler/backends/llvm/codegen/PatioToLlvmFunctionContext.java
+++ b/src/main/java/org/shedlang/compiler/backends/llvm/codegen/PatioToLlvmFunctionContext.java
@@ -69,7 +69,9 @@ class PatioToLlvmFunctionContext {
     }
 
     PatioToLlvmModuleContext.Result<PVector<LlvmBasicBlock>> toBasicBlocks() {
-        // TODO: check there are no instructions without a terminator.
+        if (!this.instructions.isEmpty()) {
+            throw new IllegalStateException("basic block is missing terminator instruction");
+        }
 
         return this.moduleContext.toResult(this.basicBlocks);
     }