CSE2410 Fall 2014 Bounce

// Copyright 2012 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:

//

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//       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

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//       with the distribution.

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//       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_X64_FRAMES_X64_H_

#define V8_X64_FRAMES_X64_H_

namespace v8 {

namespace internal {

const int kNumRegs = 16;

const RegList kJSCallerSaved =

    1 << 0 |  // rax

    1 << 1 |  // rcx

    1 << 2 |  // rdx

    1 << 3 |  // rbx - used as a caller-saved register in JavaScript code

    1 << 7;   // rdi - callee function

const int kNumJSCallerSaved = 5;

typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];

// Number of registers for which space is reserved in safepoints.

const int kNumSafepointRegisters = 16;

// ----------------------------------------------------

class EntryFrameConstants : public AllStatic {

 public:

#ifdef _WIN64

  static const int kCalleeSaveXMMRegisters = 10;

  static const int kXMMRegisterSize = 16;

  static const int kXMMRegistersBlockSize =

      kXMMRegisterSize * kCalleeSaveXMMRegisters;

  static const int kCallerFPOffset =

      -10 * kPointerSize - kXMMRegistersBlockSize;

#else

  static const int kCallerFPOffset      = -8 * kPointerSize;

#endif

  static const int kArgvOffset          = 6 * kPointerSize;

};

class ExitFrameConstants : public AllStatic {

 public:

  static const int kCodeOffset      = -2 * kPointerSize;

  static const int kSPOffset        = -1 * kPointerSize;

  static const int kCallerFPOffset  = +0 * kPointerSize;

  static const int kCallerPCOffset  = kFPOnStackSize;

  // FP-relative displacement of the caller's SP.  It points just

  // below the saved PC.

  static const int kCallerSPDisplacement = kCallerPCOffset + kPCOnStackSize;

};

class JavaScriptFrameConstants : public AllStatic {

 public:

  // FP-relative.

  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;

  static const int kLastParameterOffset = kFPOnStackSize + kPCOnStackSize;

  static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;

  // Caller SP-relative.

  static const int kParam0Offset   = -2 * kPointerSize;

  static const int kReceiverOffset = -1 * kPointerSize;

};

class ArgumentsAdaptorFrameConstants : public AllStatic {

 public:

  // FP-relative.

  static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;

  static const int kFrameSize =

      StandardFrameConstants::kFixedFrameSize + kPointerSize;

};

class ConstructFrameConstants : public AllStatic {

 public:

  // FP-relative.

  static const int kImplicitReceiverOffset = -5 * kPointerSize;

  static const int kConstructorOffset      = kMinInt;

  static const int kLengthOffset           = -4 * kPointerSize;

  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;

  static const int kFrameSize =

      StandardFrameConstants::kFixedFrameSize + 3 * kPointerSize;

};

class InternalFrameConstants : public AllStatic {

 public:

  // FP-relative.

  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;

};

inline Object* JavaScriptFrame::function_slot_object() const {

  const int offset = JavaScriptFrameConstants::kFunctionOffset;

  return Memory::Object_at(fp() + offset);

}

inline void StackHandler::SetFp(Address slot, Address fp) {

  Memory::Address_at(slot) = fp;

}

} }  // namespace v8::internal

#endif  // V8_X64_FRAMES_X64_H_