Add push-unit instruction

3 files changed, 12 insertions, 1 deletions

diff --git a/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java b/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
index 1acb949a..70959410 100644
--- a/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
+++ b/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
@@ -109,6 +109,11 @@ public class InstructionSerializer {
                     treeIdentifier("push-string"),
                     treeString(pushStringInstruction.value())
                 );
+
+            case PushUnitInstruction pushUnitInstruction ->
+                treeList(
+                    treeIdentifier("push-unit")
+                );
         };
     }
 
diff --git a/src/main/java/org/shedlang/compiler/stackir/instructions/Instruction.java b/src/main/java/org/shedlang/compiler/stackir/instructions/Instruction.java
index 0cd97c83..fde83eed 100644
--- a/src/main/java/org/shedlang/compiler/stackir/instructions/Instruction.java
+++ b/src/main/java/org/shedlang/compiler/stackir/instructions/Instruction.java
@@ -3,7 +3,7 @@ package org.shedlang.compiler.stackir.instructions;
 import org.shedlang.compiler.sources.Source;
 
 public sealed interface Instruction
-    permits CallInstruction, DefineFunctionInstruction, DiscardInstruction, LocalLoadInstruction, LocalStoreInstruction, ModuleExportInstruction, PushBoolInstruction, PushIntInstruction, PushStringInstruction {
+    permits CallInstruction, DefineFunctionInstruction, DiscardInstruction, LocalLoadInstruction, LocalStoreInstruction, ModuleExportInstruction, PushBoolInstruction, PushIntInstruction, PushStringInstruction, PushUnitInstruction {
 
     Source source();
 }
diff --git a/src/main/java/org/shedlang/compiler/stackir/instructions/PushUnitInstruction.java b/src/main/java/org/shedlang/compiler/stackir/instructions/PushUnitInstruction.java
new file mode 100644
index 00000000..c7c306c4
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/stackir/instructions/PushUnitInstruction.java
@@ -0,0 +1,6 @@
+package org.shedlang.compiler.stackir.instructions;
+
+import org.shedlang.compiler.sources.Source;
+
+public record PushUnitInstruction(Source source) implements Instruction {
+}