Add initial skeleton of cranelift backend

2 files changed, 94 insertions, 0 deletions

diff --git a/src/main/java/org/shedlang/compiler/backends/cranelift/CraneliftBackend.java b/src/main/java/org/shedlang/compiler/backends/cranelift/CraneliftBackend.java
new file mode 100644
index 00000000..97d0a156
--- /dev/null
+++ b/src/main/java/org/shedlang/compiler/backends/cranelift/CraneliftBackend.java
@@ -0,0 +1,50 @@
+package org.shedlang.compiler.backends.cranelift;
+
+import com.google.flatbuffers.FlatBufferBuilder;
+import org.shedlang.compiler.backends.llvm.LlvmBackend;
+import org.shedlang.compiler.backends.llvm.LlvmTarget;
+import org.shedlang.compiler.backends.paths.PartialTargetPath;
+import org.shedlang.compiler.filesystem.ShedCompilerFiles;
+import org.shedlang.compiler.patio.PatioCompilationUnit;
+import org.shedlang.compiler.patio.serialization.PatioToFlatbuffers;
+import org.shedlang.compiler.runtime.ShedRuntime;
+import org.shedlang.compiler.util.processes.ProcessError;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+
+import static org.shedlang.compiler.util.processes.ProcessRunner.runInheritIo;
+
+public class CraneliftBackend {
+    public static Path compileCompilationUnit(
+        PatioCompilationUnit patio,
+        PartialTargetPath partialTargetPath
+    ) throws IOException, InterruptedException {
+        var fbsBuilder = new FlatBufferBuilder();
+        var compilationUnitOffset = PatioToFlatbuffers.serializeCompilationUnit(fbsBuilder, patio);
+        fbsBuilder.finish(compilationUnitOffset);
+
+        // TODO: avoid the copy
+        var patioPath = partialTargetPath.withExtension("patio");
+        Files.write(patioPath, fbsBuilder.sizedByteArray());
+
+        runInheritIo(List.of(
+            ShedCompilerFiles.getRoot().resolve("patio-to-cranelift/target/debug/patio-to-cranelift").toString(),
+            patioPath.toString()
+        ));
+
+        var objectFilePath = partialTargetPath.withExtension(".o");
+        return objectFilePath;
+    }
+
+    public static void link(
+        List<Path> inputs,
+        Path outputPath,
+        ShedRuntime shedRuntime
+    ) throws ProcessError, InterruptedException {
+        // TODO: extract linking if it's not specific to LLVM.
+        LlvmBackend.forTarget(LlvmTarget.AMD64).link(inputs, outputPath, shedRuntime);
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/backends/cranelift/PatioToCraneliftTests.java b/src/test/java/org/shedlang/compiler/backends/cranelift/PatioToCraneliftTests.java
new file mode 100644
index 00000000..ff9b1d82
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/backends/cranelift/PatioToCraneliftTests.java
@@ -0,0 +1,44 @@
+package org.shedlang.compiler.backends.cranelift;
+
+import org.junit.jupiter.api.Disabled;
+import org.shedlang.compiler.backends.llvm.LlvmTarget;
+import org.shedlang.compiler.backends.paths.PartialTargetPath;
+import org.shedlang.compiler.patio.PatioCompilationUnit;
+import org.shedlang.compiler.patio.PatioExampleTests;
+import org.shedlang.compiler.runtime.ShedRuntime;
+import org.shedlang.compiler.testing.ExecutionResult;
+import org.shedlang.compiler.testing.TestProcessRunner;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+
+@Disabled
+public class PatioToCraneliftTests extends PatioExampleTests {
+    @Override
+    protected ExecutionResult executeCompilationUnit(PatioCompilationUnit patio) throws IOException, InterruptedException {
+        Files.createDirectories(Path.of("tests-tmp"));
+        var workingDirectory = Files.createTempDirectory(Path.of("tests-tmp"), "PatioToCraneliftTests");
+
+        var objectFilePath = CraneliftBackend.compileCompilationUnit(
+            patio,
+            new PartialTargetPath(workingDirectory.resolve("main"))
+        );
+
+        var executablePath = workingDirectory.resolve("main");
+
+        var runtime = ShedRuntime.defaultRuntime(LlvmTarget.AMD64.targetName());
+        CraneliftBackend.link(
+            List.of(
+                objectFilePath,
+                runtime.dir().resolve("libpatio_test.a")
+            ),
+            executablePath,
+            runtime
+        );
+
+        return TestProcessRunner.runCaptureOutput(List.of(executablePath.toString()));
+
+    }
+}