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      1 // Copyright 2012 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_X64_FRAMES_X64_H_
     29 #define V8_X64_FRAMES_X64_H_
     30 
     31 namespace v8 {
     32 namespace internal {
     33 
     34 const int kNumRegs = 16;
     35 const RegList kJSCallerSaved =
     36     1 << 0 |  // rax
     37     1 << 1 |  // rcx
     38     1 << 2 |  // rdx
     39     1 << 3 |  // rbx - used as a caller-saved register in JavaScript code
     40     1 << 7;   // rdi - callee function
     41 
     42 const int kNumJSCallerSaved = 5;
     43 
     44 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
     45 
     46 // Number of registers for which space is reserved in safepoints.
     47 const int kNumSafepointRegisters = 16;
     48 
     49 // ----------------------------------------------------
     50 
     51 class EntryFrameConstants : public AllStatic {
     52  public:
     53 #ifdef _WIN64
     54   static const int kCalleeSaveXMMRegisters = 10;
     55   static const int kXMMRegisterSize = 16;
     56   static const int kXMMRegistersBlockSize =
     57       kXMMRegisterSize * kCalleeSaveXMMRegisters;
     58   static const int kCallerFPOffset =
     59       -10 * kPointerSize - kXMMRegistersBlockSize;
     60 #else
     61   static const int kCallerFPOffset      = -8 * kPointerSize;
     62 #endif
     63   static const int kArgvOffset          = 6 * kPointerSize;
     64 };
     65 
     66 
     67 class ExitFrameConstants : public AllStatic {
     68  public:
     69   static const int kCodeOffset      = -2 * kPointerSize;
     70   static const int kSPOffset        = -1 * kPointerSize;
     71 
     72   static const int kCallerFPOffset  = +0 * kPointerSize;
     73   static const int kCallerPCOffset  = +1 * kPointerSize;
     74 
     75   // FP-relative displacement of the caller's SP.  It points just
     76   // below the saved PC.
     77   static const int kCallerSPDisplacement = +2 * kPointerSize;
     78 };
     79 
     80 
     81 class JavaScriptFrameConstants : public AllStatic {
     82  public:
     83   // FP-relative.
     84   static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
     85   static const int kLastParameterOffset = +2 * kPointerSize;
     86   static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
     87 
     88   // Caller SP-relative.
     89   static const int kParam0Offset   = -2 * kPointerSize;
     90   static const int kReceiverOffset = -1 * kPointerSize;
     91 };
     92 
     93 
     94 class ArgumentsAdaptorFrameConstants : public AllStatic {
     95  public:
     96   // FP-relative.
     97   static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
     98 
     99   static const int kFrameSize =
    100       StandardFrameConstants::kFixedFrameSize + kPointerSize;
    101 };
    102 
    103 
    104 class ConstructFrameConstants : public AllStatic {
    105  public:
    106   // FP-relative.
    107   static const int kImplicitReceiverOffset = -5 * kPointerSize;
    108   static const int kConstructorOffset      = kMinInt;
    109   static const int kLengthOffset           = -4 * kPointerSize;
    110   static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
    111 
    112   static const int kFrameSize =
    113       StandardFrameConstants::kFixedFrameSize + 3 * kPointerSize;
    114 };
    115 
    116 
    117 class InternalFrameConstants : public AllStatic {
    118  public:
    119   // FP-relative.
    120   static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
    121 };
    122 
    123 
    124 inline Object* JavaScriptFrame::function_slot_object() const {
    125   const int offset = JavaScriptFrameConstants::kFunctionOffset;
    126   return Memory::Object_at(fp() + offset);
    127 }
    128 
    129 
    130 inline void StackHandler::SetFp(Address slot, Address fp) {
    131   Memory::Address_at(slot) = fp;
    132 }
    133 
    134 
    135 } }  // namespace v8::internal
    136 
    137 #endif  // V8_X64_FRAMES_X64_H_
    138