Implement auxiliary dependency database (.d files), use in cxx.compile

This is part of the "High Fidelity Build" work.

2 files changed, 174 insertions, 0 deletions

diff --git a/tests/depdb/buildfile b/tests/depdb/buildfile
new file mode 100644
index 0000000..53e9cd3
--- /dev/null
+++ b/tests/depdb/buildfile
@@ -0,0 +1,8 @@
+# file      : tests/depdb/buildfile
+# copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+import libs = libbutl%lib{butl}
+
+exe{driver}: cxx{driver ../../build2/{depdb}} $libs
+exe{driver}: test.arguments = $out_base/test.d
diff --git a/tests/depdb/driver.cxx b/tests/depdb/driver.cxx
new file mode 100644
index 0000000..f156991
--- /dev/null
+++ b/tests/depdb/driver.cxx
@@ -0,0 +1,166 @@
+// file      : tests/depdb/driver.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <iostream>
+
+#include <butl/filesystem>
+
+#include <build2/types>
+#include <build2/utility>
+
+#include <build2/depdb>
+
+using namespace std;
+using namespace build2;
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " <db-file>" << endl;
+    return 1;
+  }
+
+  path p (argv[1]);
+  auto rm = [&p] () {try_rmfile (p);};
+
+  // Create empty database.
+  //
+  {
+    rm ();
+
+    {
+      depdb d (p);
+      assert (d.writing ());
+      d.close ();
+    }
+
+    {
+      depdb d (p);
+      assert (d.reading ());
+      assert (!d.more ());
+      assert (d.read () == nullptr);
+      d.close ();
+    }
+  }
+
+  // No close/end marker.
+  //
+  {
+    rm ();
+
+    {
+      depdb d (p);
+      assert (d.writing ());
+      // No close.
+    }
+
+    {
+      depdb d (p);
+      assert (d.writing ());
+      d.close ();
+    }
+
+    {
+      depdb d (p);
+      assert (d.reading ());
+    }
+  }
+
+  // Overwrite/append/truncate.
+  //
+  {
+    rm ();
+
+    {
+      depdb d (p);
+      d.write ("foo");
+      d.close ();
+    }
+
+    {
+      depdb d (p);
+      assert (*d.read () == "foo");
+      assert (!d.more ());
+      d.close ();
+    }
+
+    {
+      depdb d (p);
+      assert (*d.read () == "foo");
+      assert (!d.more ());
+      d.write ("FOO");
+      d.close ();
+    }
+
+    {
+      depdb d (p);
+      assert (*d.read () == "FOO");
+      assert (!d.more ());
+      assert (d.read () == nullptr);
+      assert (d.read () == nullptr);
+      d.write ("BAR");
+      d.close ();
+    }
+
+    {
+      depdb d (p);
+      assert (*d.read () == "FOO");
+      assert (d.more ());
+      d.write ("foo");
+      d.close (); // Truncate.
+    }
+
+    {
+      depdb d (p);
+      assert (*d.read () == "foo");
+      assert (!d.more ());
+    }
+
+    // Stray end marker.
+    //
+    {
+      depdb d (p);
+      assert (*d.read () == "foo");
+      d.write ("fox");
+      // No close.
+    }
+
+    {
+      depdb d (p);
+      assert (d.more ());
+      assert (*d.read () == "fox");
+      assert (!d.more ());
+    }
+  }
+
+  // Read/truncate.
+  //
+  {
+    rm ();
+
+    {
+      depdb d (p);
+      d.write ("foo");
+      d.write ("bar");
+      d.close ();
+    }
+
+    {
+      depdb d (p);
+      assert (*d.read () == "foo");
+      assert (d.more ());
+      d.close (); // Truncate bar.
+    }
+
+    {
+      depdb d (p);
+      assert (*d.read () == "foo");
+      assert (!d.more ());
+    }
+  }
+
+  rm ();
+}