Add field-load instruction

3 files changed, 23 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 35789b18..ef832b90 100644
--- a/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
+++ b/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
@@ -74,6 +74,13 @@ public class InstructionSerializer {
                 treeList(
                     treeIdentifier("discard")
                 );
+
+            case FieldLoadInstruction fieldLoad ->
+                treeList(
+                    treeIdentifier("field-load"),
+                    treeString(fieldLoad.namespaceName().toString()),
+                    treeString(fieldLoad.fieldName())
+                );
             
             case LocalLoadInstruction localLoadInstruction ->
                 treeList(
diff --git a/src/main/java/org/shedlang/compiler/stackir/instructions/FieldLoadInstruction.java b/src/main/java/org/shedlang/compiler/stackir/instructions/FieldLoadInstruction.java
new file mode 100644
index 00000000..98ea9952
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/stackir/instructions/FieldLoadInstruction.java
@@ -0,0 +1,15 @@
+package org.shedlang.compiler.stackir.instructions;
+
+import org.shedlang.compiler.sources.Source;
+import org.shedlang.compiler.types.NamespaceName;
+
+/**
+ * Pop a value from the stack, get the given field from the popped value, and
+ * push the field's value onto the stack.
+ */
+public record FieldLoadInstruction(
+    NamespaceName namespaceName,
+    String fieldName,
+    Source source
+) implements Instruction {
+}
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 1fb0bede..6a21404c 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, NamespaceFieldStoreInstruction, NamespaceImportInstruction, PushBoolInstruction, PushIntInstruction, PushStringInstruction, PushUnitInstruction, ReturnInstruction {
+    permits CallInstruction, DefineFunctionInstruction, DiscardInstruction, FieldLoadInstruction, LocalLoadInstruction, LocalStoreInstruction, NamespaceFieldStoreInstruction, NamespaceImportInstruction, PushBoolInstruction, PushIntInstruction, PushStringInstruction, PushUnitInstruction, ReturnInstruction {
 
     Source source();
 }