CSE2410 Fall 2014 Bounce

// Copyright 2006-2008 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.

#ifndef V8_CODE_STUBS_H_

#define V8_CODE_STUBS_H_

namespace v8 { namespace internal {

// Stub is base classes of all stubs.

class CodeStub BASE_EMBEDDED {

 public:

  enum Major {

    CallFunction,

    GenericBinaryOp,

    SmiOp,

    Compare,

    RecordWrite,  // Last stub that allows stub calls inside.

    StackCheck,

    UnarySub,

    RevertToNumber,

    ToBoolean,

    Instanceof,

    CounterOp,

    ArgumentsAccess,

    Runtime,

    CEntry,

    JSEntry,

    GetProperty,   // ARM only

    SetProperty,   // ARM only

    InvokeBuiltin,  // ARM only

    JSExit,        // ARM only

    NUMBER_OF_IDS

  };

  // Retrieve the code for the stub. Generate the code if needed.

  Handle<Code> GetCode();

  static Major MajorKeyFromKey(uint32_t key) {

    return static_cast<Major>(MajorKeyBits::decode(key));

  };

  static int MinorKeyFromKey(uint32_t key) {

    return MinorKeyBits::decode(key);

  };

  static const char* MajorName(Major major_key);

  virtual ~CodeStub() {}

 protected:

  static const int kMajorBits = 5;

  static const int kMinorBits = kBitsPerPointer - kMajorBits - kSmiTagSize;

 private:

  // Generates the assembler code for the stub.

  virtual void Generate(MacroAssembler* masm) = 0;

  // Returns information for computing the number key.

  virtual Major MajorKey() = 0;

  virtual int MinorKey() = 0;

  // Returns a name for logging/debugging purposes.

  virtual const char* GetName() { return MajorName(MajorKey()); }

#ifdef DEBUG

  virtual void Print() { PrintF("%s\n", GetName()); }

#endif

  // Computes the key based on major and minor.

  uint32_t GetKey() {

    ASSERT(static_cast<int>(MajorKey()) < NUMBER_OF_IDS);

    return MinorKeyBits::encode(MinorKey()) |

           MajorKeyBits::encode(MajorKey());

  }

  bool AllowsStubCalls() { return MajorKey() <= RecordWrite; }

  class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {};

  class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {};

  friend class BreakPointIterator;

};

} }  // namespace v8::internal

#endif  // V8_CODE_STUBS_H_