Compile function definition into stack instructions

3 files changed, 62 insertions, 0 deletions

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 80c02765..9d6cc3c3 100644
--- a/src/test/java/org/shedlang/compiler/ast/typed/Typed.java
+++ b/src/test/java/org/shedlang/compiler/ast/typed/Typed.java
@@ -2,6 +2,7 @@ package org.shedlang.compiler.ast.typed;
 
 import org.shedlang.compiler.sources.Sources;
 import org.shedlang.compiler.types.Type;
+import org.shedlang.compiler.types.TypeLevelValue;
 import org.shedlang.compiler.types.Types;
 
 import java.math.BigInteger;
@@ -52,4 +53,11 @@ public class Typed {
     public static TypedReferenceNode reference(String name, Type type) {
         return new TypedReferenceNode(name, type, Sources.NULL);
     }
+
+    public static <T extends TypeLevelValue> TypedTypeLevelExpressionNode<T> typeLevelReference(
+        String name,
+        T value
+    ) {
+        return new TypedTypeLevelReferenceNode<>(name, value, Sources.NULL);
+    }
 }
diff --git a/src/test/java/org/shedlang/compiler/stackir/StackCompilerFunctionDefinitionTests.java b/src/test/java/org/shedlang/compiler/stackir/StackCompilerFunctionDefinitionTests.java
new file mode 100644
index 00000000..4e0be235
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/stackir/StackCompilerFunctionDefinitionTests.java
@@ -0,0 +1,43 @@
+package org.shedlang.compiler.stackir;
+
+import org.junit.jupiter.api.Test;
+import org.shedlang.compiler.ast.typed.Typed;
+import org.shedlang.compiler.ast.typed.TypedFunctionDefinitionNode;
+import org.shedlang.compiler.stackir.instructions.DefineFunctionInstruction;
+import org.shedlang.compiler.types.Types;
+
+import static org.shedlang.compiler.stackir.instructions.InstructionMatchers.*;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.*;
+
+public class StackCompilerFunctionDefinitionTests {
+    @Test
+    public void functionIsCompiledToDefineFunctionInstruction() {
+        var node = TypedFunctionDefinitionNode.builder()
+            .withName("f")
+            .addPositionalParam("x", Typed.typeLevelReference("String", Types.STRING))
+            .addNamedParam("y", Typed.typeLevelReference("Int", Types.INT))
+            .addStatement(Typed.expressionStatement(Typed.stringLiteral("hello")))
+            .build();
+
+        var instructions = StackCompiler.compileNamespaceStatement(node);
+
+        assertThat(instructions, isSequence(
+            instanceOf(
+                DefineFunctionInstruction.class,
+                has("name", x -> x.name(), equalTo("f")),
+                has("positionalParams", x -> x.positionalParams(), isSequence(
+                    isDefineFunctionInstructionParam("x")
+                )),
+                has("namedParams", x -> x.namedParams(), isSequence(
+                    isDefineFunctionInstructionParam("y")
+                )),
+                has("body", x -> x.body(), isSequence(
+                    isPushStringInstruction("hello"),
+                    isDiscardInstruction()
+                ))
+            ),
+            isLocalStoreInstruction("f")
+        ));
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java b/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
index 3863c2f9..4ae1e793 100644
--- a/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
+++ b/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
@@ -19,6 +19,10 @@ public class InstructionMatchers {
         );
     }
 
+    public static Matcher<DefineFunctionInstruction.Param> isDefineFunctionInstructionParam(String name) {
+        return has("name", x -> x.name(), equalTo(name));
+    }
+
     public static Matcher<Instruction> isDiscardInstruction() {
         return instanceOf(
             DiscardInstruction.class
@@ -32,6 +36,13 @@ public class InstructionMatchers {
         );
     }
 
+    public static Matcher<Instruction> isLocalStoreInstruction(String name) {
+        return instanceOf(
+            LocalStoreInstruction.class,
+            has("name", x -> x.name(), equalTo(name))
+        );
+    }
+
     public static Matcher<Instruction> isPushBoolInstruction(boolean value) {
         return instanceOf(
             PushBoolInstruction.class,