Add define-struct instruction

4 files changed, 41 insertions, 2 deletions

diff --git a/src/main/java/org/shedlang/compiler/patio/PatioCodeGen.java b/src/main/java/org/shedlang/compiler/patio/PatioCodeGen.java
index 1a194db8..e4a72194 100644
--- a/src/main/java/org/shedlang/compiler/patio/PatioCodeGen.java
+++ b/src/main/java/org/shedlang/compiler/patio/PatioCodeGen.java
@@ -222,6 +222,10 @@ public class PatioCodeGen {
                 yield context;
             }
 
+            case DefineStructInstruction defineStruct -> {
+                throw new UnsupportedOperationException("TODO");
+            }
+
             case DiscardInstruction discard ->
                 context.temporaryPop().context();
 
diff --git a/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java b/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
index 5336c41d..6577e2f4 100644
--- a/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
+++ b/src/main/java/org/shedlang/compiler/stackir/InstructionSerializer.java
@@ -2,6 +2,7 @@ package org.shedlang.compiler.stackir;
 
 import org.shedlang.compiler.stackir.instructions.*;
 import org.shedlang.compiler.treetext.Tree;
+import org.shedlang.compiler.types.StructType;
 
 import java.util.List;
 
@@ -70,6 +71,17 @@ public class InstructionSerializer {
                     )),
                     treeNamed("body", instructionsToTree(defineFunctionInstruction.body()))
                 );
+
+            case DefineStructInstruction defineStructInstruction ->
+                treeListIndented(
+                    treeIdentifier("define-struct"),
+                    treeNamed("type", structTypeToTree(defineStructInstruction.type())),
+                    treeNamed("fields", treeList(
+                        defineStructInstruction.fields().stream()
+                            .map(field -> treeString(field.name()))
+                            .toList()
+                    ))
+                );
             
             case DiscardInstruction discardInstruction ->
                 treeList(
@@ -94,7 +106,7 @@ public class InstructionSerializer {
                         case FieldLoadInstruction.Receiver.Struct struct ->
                             treeList(
                                 treeIdentifier("struct"),
-                                treeString(struct.type().describe())
+                                structTypeToTree(struct.type())
                             );
                     },
                     treeString(fieldLoad.fieldName())
@@ -214,4 +226,8 @@ public class InstructionSerializer {
                 );
         };
     }
+
+    private static Tree structTypeToTree(StructType type) {
+        return treeString(type.describe());
+    }
 }
diff --git a/src/main/java/org/shedlang/compiler/stackir/instructions/DefineStructInstruction.java b/src/main/java/org/shedlang/compiler/stackir/instructions/DefineStructInstruction.java
new file mode 100644
index 00000000..bafa51bf
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/stackir/instructions/DefineStructInstruction.java
@@ -0,0 +1,19 @@
+package org.shedlang.compiler.stackir.instructions;
+
+import org.shedlang.compiler.sources.Source;
+import org.shedlang.compiler.types.StructType;
+
+import java.util.List;
+
+/**
+ * Push a struct type value onto the stack with the given definition.
+ */
+public record DefineStructInstruction(
+    StructType type,
+    List<Field> fields,
+    Source source
+) implements Instruction {
+    public record Field(String name, Source 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 87466287..e43acf56 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, DuplicateInstruction, FieldLoadInstruction, IfInstruction, IntAddInstruction, IntEqualsInstruction, IntNotEqualInstruction, IntSubInstruction, LocalLoadInstruction, LocalStoreInstruction, LoopBreakInstruction, LoopContinueInstruction, LoopInstruction, NamespaceFieldStoreInstruction, NamespaceImportInstruction, PushBoolInstruction, PushIntInstruction, PushStringInstruction, PushUnitInstruction, ReturnInstruction, StringAddInstruction, TupleCreateInstruction, TupleGetInstruction, VarLoadInstruction, VarStoreInstruction {
+    permits CallInstruction, DefineFunctionInstruction, DefineStructInstruction, DiscardInstruction, DuplicateInstruction, FieldLoadInstruction, IfInstruction, IntAddInstruction, IntEqualsInstruction, IntNotEqualInstruction, IntSubInstruction, LocalLoadInstruction, LocalStoreInstruction, LoopBreakInstruction, LoopContinueInstruction, LoopInstruction, NamespaceFieldStoreInstruction, NamespaceImportInstruction, PushBoolInstruction, PushIntInstruction, PushStringInstruction, PushUnitInstruction, ReturnInstruction, StringAddInstruction, TupleCreateInstruction, TupleGetInstruction, VarLoadInstruction, VarStoreInstruction {
 
     Source source();
 }