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src/compiler/CLI/QBE.cs

@@ -0,0 +1,37 @@
+using System.Diagnostics;
+
+namespace CLI;
+
+public static class QBE
+{
+    public static async Task<string?> Invoke(string ssa)
+    {
+        using var qbeProcess = new Process();
+        qbeProcess.StartInfo = new ProcessStartInfo
+        {
+            FileName = "qbe",
+            UseShellExecute = false,
+            RedirectStandardInput = true,
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            CreateNoWindow = true
+        };
+
+        qbeProcess.Start();
+
+        await qbeProcess.StandardInput.WriteAsync(ssa);
+        qbeProcess.StandardInput.Close();
+
+        await qbeProcess.WaitForExitAsync();
+
+        var qbeErrors = await qbeProcess.StandardError.ReadToEndAsync();
+        if (!string.IsNullOrWhiteSpace(qbeErrors))
+        {
+            await Console.Error.WriteLineAsync("qbe error:\n" + qbeErrors);
+        }
+
+        var asm = await qbeProcess.StandardOutput.ReadToEndAsync();
+
+        return qbeProcess.ExitCode == 0 ? asm : null;
+    }
+}