Turn infer types into proper HPhase.

src/hydrogen-infer-types.cc

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "hydrogen-infer-types.h"
+
+namespace v8 {
+namespace internal {
+
+void HInferTypesPhase::InitializeInferredTypes(int from_inclusive,
+                                               int to_inclusive) {
+  for (int i = from_inclusive; i <= to_inclusive; ++i) {
+    HBasicBlock* block = graph()->blocks()->at(i);
+
+    const ZoneList<HPhi*>* phis = block->phis();
+    for (int j = 0; j < phis->length(); j++) {
+      phis->at(j)->UpdateInferredType();
+    }
+
+    for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
+      it.Current()->UpdateInferredType();
+    }
+
+    if (block->IsLoopHeader()) {
+      HBasicBlock* last_back_edge =
+          block->loop_information()->GetLastBackEdge();
+      InitializeInferredTypes(i + 1, last_back_edge->block_id());
+      // Skip all blocks already processed by the recursive call.
+      i = last_back_edge->block_id();
+      // Update phis of the loop header now after the whole loop body is
+      // guaranteed to be processed.
+      for (int j = 0; j < block->phis()->length(); ++j) {
+        HPhi* phi = block->phis()->at(j);
+        worklist_.Add(phi, zone());
+        in_worklist_.Add(phi->id());
+      }
+      while (!worklist_.is_empty()) {
+        HValue* current = worklist_.RemoveLast();
+        in_worklist_.Remove(current->id());
+        if (current->UpdateInferredType()) {
+          for (HUseIterator it(current->uses()); !it.Done(); it.Advance()) {
+            HValue* use = it.value();
+            if (!in_worklist_.Contains(use->id())) {
+              in_worklist_.Add(use->id());
+              worklist_.Add(use, zone());
+            }
+          }
+        }
+      }
+      ASSERT(in_worklist_.IsEmpty());
+    }
+  }
+}
+
+} }  // namespace v8::internal