Add try instruction

2 files changed, 60 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
index bcf7e27f..7c974d94 100644
--- a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
+++ b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
@@ -377,6 +377,53 @@ public class InstructionSerializerTests {
             )"""
         ));
     }
+    @Test
+    public void canSerializeTry() {
+        var effect = Effects.userDefined(NamespaceName.of("Example", "Project"), "State");
+        var instruction = Instructions.try_(
+            effect, List.of(
+                DefineFunctionInstruction.builder()
+                    .withName("read")
+                    .build(),
+                DefineFunctionInstruction.builder()
+                    .withName("write")
+                    .build()
+            ), List.of(
+                Instructions.pushUnit()
+            )
+        );
+
+        var string = serialize(instruction);
+
+        assertThat(string, equalTo("""
+            (
+                try
+                "Example/Project.State"
+                (
+                    (push-unit)
+                )
+                (
+                    (
+                        define-function
+                        name="read"
+                        positional-params=()
+                        named-params=()
+                        free-variables=()
+                        body=(
+                        )
+                    )
+                    (
+                        define-function
+                        name="write"
+                        positional-params=()
+                        named-params=()
+                        free-variables=()
+                        body=(
+                        )
+                    )
+                )
+            )"""));
+    }
 
     @Test
     public void canSerializeTupleCreate() {
diff --git a/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java b/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
index 643d9446..8133750d 100644
--- a/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
+++ b/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
@@ -150,6 +150,19 @@ public class Instructions {
         return new SwitchInstruction.Case(type, body, Sources.NULL);
     }
 
+    public static Instruction try_(
+        UserDefinedEffect handledEffect,
+        List<DefineFunctionInstruction> handlerMethods,
+        List<Instruction> body
+    ) {
+        return new TryInstruction(
+            handledEffect,
+            handlerMethods,
+            body,
+            Sources.NULL
+        );
+    }
+
     public static Instruction tupleCreate(int elementCount) {
         return new TupleCreateInstruction(elementCount, Sources.NULL);
     }