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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_HYDROGEN_OSR_H_
     29 #define V8_HYDROGEN_OSR_H_
     30 
     31 #include "hydrogen.h"
     32 #include "ast.h"
     33 #include "zone.h"
     34 
     35 namespace v8 {
     36 namespace internal {
     37 
     38 // Responsible for building graph parts related to OSR and otherwise
     39 // setting up the graph to do an OSR compile.
     40 class HOsrBuilder : public ZoneObject {
     41  public:
     42   explicit HOsrBuilder(HOptimizedGraphBuilder* builder)
     43     : unoptimized_frame_slots_(0),
     44       builder_(builder),
     45       osr_entry_(NULL),
     46       osr_loop_entry_(NULL),
     47       osr_values_(NULL) { }
     48 
     49   // Creates the loop entry block for the given statement, setting up OSR
     50   // entries as necessary, and sets the current block to the new block.
     51   HBasicBlock* BuildOsrLoopEntry(IterationStatement* statement);
     52 
     53   // Process the hydrogen graph after it has been completed, performing
     54   // any OSR-specific cleanups or changes.
     55   void FinishGraph();
     56 
     57   // Process the OSR values and phis after initial graph optimization.
     58   void FinishOsrValues();
     59 
     60   // Return the number of slots in the unoptimized frame at the entry to OSR.
     61   int UnoptimizedFrameSlots() const {
     62     return unoptimized_frame_slots_;
     63   }
     64 
     65   bool HasOsrEntryAt(IterationStatement* statement);
     66 
     67  private:
     68   int unoptimized_frame_slots_;
     69   HOptimizedGraphBuilder* builder_;
     70   HBasicBlock* osr_entry_;
     71   HBasicBlock* osr_loop_entry_;
     72   ZoneList<HUnknownOSRValue*>* osr_values_;
     73 };
     74 
     75 } }  // namespace v8::internal
     76 
     77 #endif  // V8_HYDROGEN_OSR_H_
     78