dart2js: add simple script to compute dependency queries. Currently only

pkg/compiler/tool/util.dart

+library compiler.tool.util;
+
+import 'package:compiler/src/info/info.dart';
+import 'graph.dart';
+
+/// Computes a graph of dependencies from [info].
+Graph<Info> graphFromInfo(AllInfo info) {
+  // Note: currently we build two graphs to debug the differences between to
+  // places where we collect this information in dump-info.
+  // TODO(sigmund): fix inconsistencies between graphs, stick with one of them.
+  // TODO(sigmund): create a concrete implementation of InfoGraph, instead of
+  // using the EdgeListGraph.
+  var g1 = new EdgeListGraph<Info>();
+  var g2 = new EdgeListGraph<Info>();
+  var g3 = new EdgeListGraph<Info>();
+  for (var f in info.functions) {
+    g1.addNode(f);
+    g3.addNode(f);
+    for (var g in f.uses) {
+      if (g.target == null) print(g.toJson());

[Harry Terkelsen, 2015/08/11 22:57:42]

only for debugging?

[Siggi Cherem (dart-lang), 2015/08/12 00:06:01]

True. removed

+      g1.addEdge(f, g.target);
+      g3.addEdge(f, g.target);
+    }
+    g2.addNode(f);
+    if (info.dependencies[f] != null) {
+      for (var g in info.dependencies[f]) {
+        g2.addEdge(f, g);
+        g3.addEdge(f, g);
+      }
+    }
+  }
+
+  for (var f in info.fields) {
+    g1.addNode(f);
+    g3.addNode(f);
+    for (var g in f.uses) {
+      g1.addEdge(f, g.target);
+      g3.addEdge(f, g.target);
+    }
+    g2.addNode(f);
+    g3.addNode(f);

[Harry Terkelsen, 2015/08/11 22:57:42]

already added f to g3 above

[Siggi Cherem (dart-lang), 2015/08/12 00:06:01]

Good catch. Done

+    if (info.dependencies[f] != null) {
+      for (var g in info.dependencies[f]) {
+        g2.addEdge(f, g);
+        g3.addEdge(f, g);
+      }
+    }
+  }
+
+  // Note: these checks right now show that 'uses' links are computed
+  // differently than 'deps' links
+  int more1 = 0;
+  int more2 = 0;
+  int more1b = 0;
+  int more2b = 0;
+  _sameEdges(f) {
+    var targets1 = g1.targetsOf(f).toSet();
+    var targets2 = g2.targetsOf(f).toSet();
+    var len1 = targets1.length;
+    var len2 = targets2.length;
+    if (len1 > len2) more1b++;
+    if (len1 < len2) more2b++;
+    var diff1 = targets1.difference(targets2);
+    var diff2 = targets2.difference(targets1);
+    if (diff1.isNotEmpty) {
+      more1++;
+    }
+    if (diff2.isNotEmpty) {
+      more2++;
+    }
+    return true;
+  }
+  info.functions.forEach(_sameEdges);
+  info.fields.forEach(_sameEdges);
+  if (more1 > 0 || more2 > 0 || more1b > 0 || more2b > 0) {
+    print("Dep graph is not consistent: $more1 $more2");
+  }
+
+  return g3;
+}
+
+/// Provide a unique long name associated with [info].
+// TODO(sigmund): guarantee that the name is actually unique.
+String longName(Info info) {
+  var sb = new StringBuffer();
+  helper(i) {
+    if (i.parent == null) {
+      // TODO(sigmund): ensure `i is LibraryInfo`, we still don't set parents
+      // for closure classes correctly.
+      sb.write('${i.name}..');
+    } else {
+      helper(i.parent);
+      sb.write('.${i.name}');
+    }
+  }
+  helper(info);
+  return sb.toString();
+}