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//
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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
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11//       with the distribution.
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13//       contributors may be used to endorse or promote products derived
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15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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
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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
31namespace v8 {
32namespace internal {
33
34const int kNumRegs = 16;
35const 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
42const int kNumJSCallerSaved = 5;
43
44typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
45
46// Number of registers for which space is reserved in safepoints.
47const int kNumSafepointRegisters = 16;
48
49// ----------------------------------------------------
50
51class 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
67class 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  = kFPOnStackSize;
74
75  // FP-relative displacement of the caller's SP.  It points just
76  // below the saved PC.
77  static const int kCallerSPDisplacement = kCallerPCOffset + kPCOnStackSize;
78};
79
80
81class JavaScriptFrameConstants : public AllStatic {
82 public:
83  // FP-relative.
84  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
85  static const int kLastParameterOffset = kFPOnStackSize + kPCOnStackSize;
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
94class 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
104class 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
117class InternalFrameConstants : public AllStatic {
118 public:
119  // FP-relative.
120  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
121};
122
123
124inline Object* JavaScriptFrame::function_slot_object() const {
125  const int offset = JavaScriptFrameConstants::kFunctionOffset;
126  return Memory::Object_at(fp() + offset);
127}
128
129
130inline 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