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src/compiler/NubLang.CLI/QBE.cs

@@ -0,0 +1,36 @@
+using System.Diagnostics;
+
+namespace NubLang.CLI;
+
+public static class QBE
+{
+    public static async Task<string?> Invoke(string ssa)
+    {
+        using var process = new Process();
+        process.StartInfo = new ProcessStartInfo("qbe")
+        {
+            UseShellExecute = false,
+            RedirectStandardInput = true,
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            CreateNoWindow = true
+        };
+
+        process.Start();
+
+        await process.StandardInput.WriteAsync(ssa);
+        process.StandardInput.Close();
+
+        await process.WaitForExitAsync();
+
+        var errors = await process.StandardError.ReadToEndAsync();
+        if (!string.IsNullOrWhiteSpace(errors))
+        {
+            await Console.Error.WriteLineAsync("qbe error:\n" + errors);
+        }
+
+        var asm = await process.StandardOutput.ReadToEndAsync();
+
+        return process.ExitCode == 0 ? asm : null;
+    }
+}