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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_IA32_FRAMES_IA32_H_
      6 #define V8_IA32_FRAMES_IA32_H_
      7 
      8 namespace v8 {
      9 namespace internal {
     10 
     11 
     12 // Register lists
     13 // Note that the bit values must match those used in actual instruction encoding
     14 const int kNumRegs = 8;
     15 
     16 
     17 // Caller-saved registers
     18 const RegList kJSCallerSaved =
     19   1 << 0 |  // eax
     20   1 << 1 |  // ecx
     21   1 << 2 |  // edx
     22   1 << 3 |  // ebx - used as a caller-saved register in JavaScript code
     23   1 << 7;   // edi - callee function
     24 
     25 const int kNumJSCallerSaved = 5;
     26 
     27 
     28 // Number of registers for which space is reserved in safepoints.
     29 const int kNumSafepointRegisters = 8;
     30 
     31 const int kNoAlignmentPadding = 0;
     32 const int kAlignmentPaddingPushed = 2;
     33 const int kAlignmentZapValue = 0x12345678;  // Not heap object tagged.
     34 
     35 // ----------------------------------------------------
     36 
     37 
     38 class EntryFrameConstants : public AllStatic {
     39  public:
     40   static const int kCallerFPOffset      = -6 * kPointerSize;
     41 
     42   static const int kFunctionArgOffset   = +3 * kPointerSize;
     43   static const int kReceiverArgOffset   = +4 * kPointerSize;
     44   static const int kArgcOffset          = +5 * kPointerSize;
     45   static const int kArgvOffset          = +6 * kPointerSize;
     46 };
     47 
     48 
     49 class ExitFrameConstants : public AllStatic {
     50  public:
     51   static const int kFrameSize      = 2 * kPointerSize;
     52 
     53   static const int kCodeOffset     = -2 * kPointerSize;
     54   static const int kSPOffset       = -1 * kPointerSize;
     55 
     56   static const int kCallerFPOffset =  0 * kPointerSize;
     57   static const int kCallerPCOffset = +1 * kPointerSize;
     58 
     59   // FP-relative displacement of the caller's SP.  It points just
     60   // below the saved PC.
     61   static const int kCallerSPDisplacement = +2 * kPointerSize;
     62 
     63   static const int kConstantPoolOffset   = 0;  // Not used
     64 };
     65 
     66 
     67 class JavaScriptFrameConstants : public AllStatic {
     68  public:
     69   // FP-relative.
     70   static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
     71   static const int kLastParameterOffset = +2 * kPointerSize;
     72   static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
     73 
     74   // Caller SP-relative.
     75   static const int kParam0Offset   = -2 * kPointerSize;
     76   static const int kReceiverOffset = -1 * kPointerSize;
     77 
     78   static const int kDynamicAlignmentStateOffset = kLocal0Offset;
     79 };
     80 
     81 
     82 class ArgumentsAdaptorFrameConstants : public AllStatic {
     83  public:
     84   // FP-relative.
     85   static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
     86 
     87   static const int kFrameSize =
     88       StandardFrameConstants::kFixedFrameSize + kPointerSize;
     89 };
     90 
     91 
     92 class ConstructFrameConstants : public AllStatic {
     93  public:
     94   // FP-relative.
     95   static const int kImplicitReceiverOffset = -5 * kPointerSize;
     96   static const int kConstructorOffset      = kMinInt;
     97   static const int kLengthOffset           = -4 * kPointerSize;
     98   static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
     99 
    100   static const int kFrameSize =
    101       StandardFrameConstants::kFixedFrameSize + 3 * kPointerSize;
    102 };
    103 
    104 
    105 class InternalFrameConstants : public AllStatic {
    106  public:
    107   // FP-relative.
    108   static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
    109 };
    110 
    111 
    112 inline Object* JavaScriptFrame::function_slot_object() const {
    113   const int offset = JavaScriptFrameConstants::kFunctionOffset;
    114   return Memory::Object_at(fp() + offset);
    115 }
    116 
    117 
    118 inline void StackHandler::SetFp(Address slot, Address fp) {
    119   Memory::Address_at(slot) = fp;
    120 }
    121 
    122 
    123 } }  // namespace v8::internal
    124 
    125 #endif  // V8_IA32_FRAMES_IA32_H_
    126