v8/src/hydrogen-infer-types.cc
2013-07-08 08:33:03 +00:00

78 lines
3.2 KiB
C++

// 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::InferTypes(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();
InferTypes(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