[turbofan] Cleanup Schedule and related classes.

src/compiler/schedule.cc

Index: src/compiler/schedule.cc
diff --git a/src/compiler/schedule.cc b/src/compiler/schedule.cc
index 30bfbc8ecfecc089380d9db4114c0139ef3737b2..2f5e0f00f077328f404a122b030043e69e0b2c9d 100644
--- a/src/compiler/schedule.cc
+++ b/src/compiler/schedule.cc
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/compiler/schedule.h"
+
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/node-properties-inl.h"
-#include "src/compiler/schedule.h"
 #include "src/ostreams.h"
 
 namespace v8 {
@@ -235,13 +236,10 @@ void Schedule::AddSuccessor(BasicBlock* block, BasicBlock* succ) {
 
 
 void Schedule::MoveSuccessors(BasicBlock* from, BasicBlock* to) {
-  for (BasicBlock::Predecessors::iterator i = from->successors_begin();
-       i != from->successors_end(); ++i) {
-    BasicBlock* succ = *i;
-    to->AddSuccessor(succ);
-    for (BasicBlock::Predecessors::iterator j = succ->predecessors_begin();
-         j != succ->predecessors_end(); ++j) {
-      if (*j == from) *j = to;
+  for (auto const successor : from->successors()) {
+    to->AddSuccessor(successor);
+    for (auto& predecessor : successor->predecessors()) {
+      if (predecessor == from) predecessor = to;
     }
   }
   from->ClearSuccessors();
@@ -264,24 +262,18 @@ void Schedule::SetBlockForNode(BasicBlock* block, Node* node) {
 
 
 std::ostream& operator<<(std::ostream& os, const Schedule& s) {
-  // TODO(svenpanne) Const-correct the RPO stuff/iterators.
-  BasicBlockVector* rpo = const_cast<Schedule*>(&s)->rpo_order();
-  for (BasicBlockVectorIter i = rpo->begin(); i != rpo->end(); ++i) {
-    BasicBlock* block = *i;
+  for (auto block : *s.rpo_order()) {
     os << "--- BLOCK B" << block->id();
     if (block->deferred()) os << " (deferred)";
     if (block->PredecessorCount() != 0) os << " <- ";
     bool comma = false;
-    for (BasicBlock::Predecessors::iterator j = block->predecessors_begin();
-         j != block->predecessors_end(); ++j) {
+    for (auto const predecessor : block->predecessors()) {
       if (comma) os << ", ";
       comma = true;
-      os << "B" << (*j)->id();
+      os << "B" << predecessor->id();
     }
     os << " ---\n";
-    for (BasicBlock::const_iterator j = block->begin(); j != block->end();
-         ++j) {
-      Node* node = *j;
+    for (auto node : *block) {
       os << "  " << *node;
       if (NodeProperties::IsTyped(node)) {
         Bounds bounds = NodeProperties::GetBounds(node);
@@ -304,11 +296,10 @@ std::ostream& operator<<(std::ostream& os, const Schedule& s) {
       }
       os << " -> ";
       comma = false;
-      for (BasicBlock::Successors::iterator j = block->successors_begin();
-           j != block->successors_end(); ++j) {
+      for (auto const successor : block->successors()) {
         if (comma) os << ", ";
         comma = true;
-        os << "B" << (*j)->id();
+        os << "B" << successor->id();
       }
       os << "\n";
     }