Compile discard instruction to LLVM IR

1 files changed, 24 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/backends/llvm/LlvmCompilerDiscardTests.java b/src/test/java/org/shedlang/compiler/backends/llvm/LlvmCompilerDiscardTests.java
new file mode 100644
index 00000000..c263caa1
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/backends/llvm/LlvmCompilerDiscardTests.java
@@ -0,0 +1,24 @@
+package org.shedlang.compiler.backends.llvm;
+
+import org.junit.jupiter.api.Test;
+import org.shedlang.compiler.backends.llvm.ir.ast.LlvmIr;
+import org.shedlang.compiler.stackir.instructions.Instructions;
+
+import static org.shedlang.compiler.backends.llvm.ir.ast.LlvmIrMatchers.isLlvmOperandInt;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.isSequence;
+
+public class LlvmCompilerDiscardTests {
+    @Test
+    public void discardRemovesTopElementFromStack() {
+        var instruction = Instructions.discard();
+        var context = LlvmCompilerContext.EMPTY
+            .push(LlvmIr.operandInt(1))
+            .push(LlvmIr.operandInt(2));
+
+        var result = LlvmCompiler.compileInstruction(instruction, context);
+
+        assertThat(result.instructions(), isSequence());
+        assertThat(result.stack(), isSequence(isLlvmOperandInt(1)));
+    }
+}