From 7c1478a872495fab3333638c3a1960edc2b0ec03 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Wed, 5 Jul 2023 22:09:28 +0100
Subject: Compile return statements to stack IR

---
 .../org/shedlang/compiler/ast/typed/Typed.java     |  4 ++++
 .../compiler/stackir/StackCompilerReturnTests.java | 22 ++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/test/java/org/shedlang/compiler/stackir/StackCompilerReturnTests.java

(limited to 'src/test/java')

diff --git a/src/test/java/org/shedlang/compiler/ast/typed/Typed.java b/src/test/java/org/shedlang/compiler/ast/typed/Typed.java
index 2b9defee..d41842dc 100644
--- a/src/test/java/org/shedlang/compiler/ast/typed/Typed.java
+++ b/src/test/java/org/shedlang/compiler/ast/typed/Typed.java
@@ -74,6 +74,10 @@ public class Typed {
         return new TypedReferenceNode(name, type, Sources.NULL);
     }
 
+    public static TypedReturnNode return_(TypedExpressionNode expression) {
+        return new TypedReturnNode(expression, Sources.NULL);
+    }
+
     public static TypedTargetNode targetVariable(String name) {
         return new TypedTargetNode.Variable(name, Sources.NULL);
     }
diff --git a/src/test/java/org/shedlang/compiler/stackir/StackCompilerReturnTests.java b/src/test/java/org/shedlang/compiler/stackir/StackCompilerReturnTests.java
new file mode 100644
index 00000000..69a3f735
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/stackir/StackCompilerReturnTests.java
@@ -0,0 +1,22 @@
+package org.shedlang.compiler.stackir;
+
+import org.junit.jupiter.api.Test;
+import org.shedlang.compiler.ast.typed.Typed;
+
+import static org.shedlang.compiler.stackir.instructions.InstructionMatchers.*;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.isSequence;
+
+public class StackCompilerReturnTests {
+    @Test
+    public void expressionIsEvaluatedAndTheResultDiscarded() {
+        var node = Typed.return_(Typed.stringLiteral("hello"));
+
+        var instructions = StackCompiler.compileFunctionStatement(node);
+
+        assertThat(instructions, isSequence(
+            isPushStringInstruction("hello"),
+            isReturnInstruction()
+        ));
+    }
+}
-- 
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