From 8c346ff940f7336a9426bc61d7f321b0944f6bdc Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 10 Jun 2023 10:18:56 +0100
Subject: Compile reference to stack instruction

---
 .../java/org/shedlang/compiler/stackir/StackCompiler.java     | 11 ++++++-----
 .../shedlang/compiler/stackir/instructions/Instruction.java   |  2 +-
 .../compiler/stackir/instructions/LocalLoadInstruction.java   |  6 ++++++
 3 files changed, 13 insertions(+), 6 deletions(-)
 create mode 100644 src/main/java/org/shedlang/compiler/stackir/instructions/LocalLoadInstruction.java

(limited to 'src/main/java')

diff --git a/src/main/java/org/shedlang/compiler/stackir/StackCompiler.java b/src/main/java/org/shedlang/compiler/stackir/StackCompiler.java
index 93fd5086..8a268c4c 100644
--- a/src/main/java/org/shedlang/compiler/stackir/StackCompiler.java
+++ b/src/main/java/org/shedlang/compiler/stackir/StackCompiler.java
@@ -1,10 +1,7 @@
 package org.shedlang.compiler.stackir;
 
 import org.shedlang.compiler.ast.typed.*;
-import org.shedlang.compiler.stackir.instructions.Instruction;
-import org.shedlang.compiler.stackir.instructions.PushBoolInstruction;
-import org.shedlang.compiler.stackir.instructions.PushIntInstruction;
-import org.shedlang.compiler.stackir.instructions.PushStringInstruction;
+import org.shedlang.compiler.stackir.instructions.*;
 
 import java.util.List;
 
@@ -25,7 +22,7 @@ public class StackCompiler {
                 compileIntLiteral(typedIntLiteralNode);
 
             case TypedReferenceNode typedReferenceNode ->
-                throw new UnsupportedOperationException("TODO");
+                compileReference(typedReferenceNode);
 
             case TypedStringLiteralNode typedStringLiteralNode ->
                 compileStringLiteral(typedStringLiteralNode);
@@ -36,6 +33,10 @@ public class StackCompiler {
         return List.of(new PushIntInstruction(node.value(), node.source()));
     }
 
+    private static List<Instruction> compileReference(TypedReferenceNode node) {
+        return List.of(new LocalLoadInstruction(node.name(), node.source()));
+    }
+
     private static List<Instruction> compileStringLiteral(TypedStringLiteralNode node) {
         return List.of(new PushStringInstruction(node.value(), node.source()));
     }
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 857d7d6a..1f84ba23 100644
--- a/src/main/java/org/shedlang/compiler/stackir/instructions/Instruction.java
+++ b/src/main/java/org/shedlang/compiler/stackir/instructions/Instruction.java
@@ -1,4 +1,4 @@
 package org.shedlang.compiler.stackir.instructions;
 
-public sealed interface Instruction permits PushBoolInstruction, PushIntInstruction, PushStringInstruction {
+public sealed interface Instruction permits LocalLoadInstruction, PushBoolInstruction, PushIntInstruction, PushStringInstruction {
 }
diff --git a/src/main/java/org/shedlang/compiler/stackir/instructions/LocalLoadInstruction.java b/src/main/java/org/shedlang/compiler/stackir/instructions/LocalLoadInstruction.java
new file mode 100644
index 00000000..b7656ed3
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/stackir/instructions/LocalLoadInstruction.java
@@ -0,0 +1,6 @@
+package org.shedlang.compiler.stackir.instructions;
+
+import org.shedlang.compiler.sources.Source;
+
+public record LocalLoadInstruction(String name, Source source) implements Instruction {
+}
-- 
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