src/x64/frames-x64.h

// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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#ifndef V8_X64_FRAMES_X64_H_
#define V8_X64_FRAMES_X64_H_

namespace v8 {
namespace internal {

static const int kNumRegs = 8;
static 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

static const int kNumJSCallerSaved = 5;

typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];

// Number of registers for which space is reserved in safepoints.
// TODO(x64): This should not be 0.
static const int kNumSafepointRegisters = 0;

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

class StackHandlerConstants : public AllStatic {
 public:
  static const int kNextOffset  = 0 * kPointerSize;
  static const int kFPOffset    = 1 * kPointerSize;
  static const int kStateOffset = 2 * kPointerSize;
  static const int kPCOffset    = 3 * kPointerSize;

  static const int kSize = 4 * kPointerSize;
};


class EntryFrameConstants : public AllStatic {
 public:
#ifdef _WIN64
  static const int kCallerFPOffset      = -10 * kPointerSize;
#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  = +1 * kPointerSize;

  // FP-relative displacement of the caller's SP.  It points just
  // below the saved PC.
  static const int kCallerSPDisplacement = +2 * kPointerSize;
};


class StandardFrameConstants : public AllStatic {
 public:
  static const int kExpressionsOffset = -3 * kPointerSize;
  static const int kMarkerOffset      = -2 * kPointerSize;
  static const int kContextOffset     = -1 * kPointerSize;
  static const int kCallerFPOffset    =  0 * kPointerSize;
  static const int kCallerPCOffset    = +1 * kPointerSize;
  static const int kCallerSPOffset    = +2 * kPointerSize;
};


class JavaScriptFrameConstants : public AllStatic {
 public:
  // FP-relative.
  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
  static const int kSavedRegistersOffset = +2 * kPointerSize;
  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:
  static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
};


class InternalFrameConstants : public AllStatic {
 public:
  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
};


inline Object* JavaScriptFrame::function_slot_object() const {
  const int offset = JavaScriptFrameConstants::kFunctionOffset;
  return Memory::Object_at(fp() + offset);
}

} }  // namespace v8::internal

#endif  // V8_X64_FRAMES_X64_H_