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
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
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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 StackHandlerConstants : public AllStatic {
52 public:
53  static const int kNextOffset     = 0 * kPointerSize;
54  static const int kCodeOffset     = 1 * kPointerSize;
55  static const int kStateOffset    = 2 * kPointerSize;
56  static const int kContextOffset  = 3 * kPointerSize;
57  static const int kFPOffset       = 4 * kPointerSize;
58
59  static const int kSize = kFPOffset + kPointerSize;
60};
61
62
63class EntryFrameConstants : public AllStatic {
64 public:
65#ifdef _WIN64
66  static const int kCallerFPOffset      = -10 * kPointerSize;
67#else
68  static const int kCallerFPOffset      = -8 * kPointerSize;
69#endif
70  static const int kArgvOffset          = 6 * kPointerSize;
71};
72
73
74class ExitFrameConstants : public AllStatic {
75 public:
76  static const int kCodeOffset      = -2 * kPointerSize;
77  static const int kSPOffset        = -1 * kPointerSize;
78
79  static const int kCallerFPOffset  = +0 * kPointerSize;
80  static const int kCallerPCOffset  = +1 * kPointerSize;
81
82  // FP-relative displacement of the caller's SP.  It points just
83  // below the saved PC.
84  static const int kCallerSPDisplacement = +2 * kPointerSize;
85};
86
87
88class StandardFrameConstants : public AllStatic {
89 public:
90  // Fixed part of the frame consists of return address, caller fp,
91  // context and function.
92  static const int kFixedFrameSize    =  4 * kPointerSize;
93  static const int kExpressionsOffset = -3 * kPointerSize;
94  static const int kMarkerOffset      = -2 * kPointerSize;
95  static const int kContextOffset     = -1 * kPointerSize;
96  static const int kCallerFPOffset    =  0 * kPointerSize;
97  static const int kCallerPCOffset    = +1 * kPointerSize;
98  static const int kCallerSPOffset    = +2 * kPointerSize;
99};
100
101
102class JavaScriptFrameConstants : public AllStatic {
103 public:
104  // FP-relative.
105  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
106  static const int kLastParameterOffset = +2 * kPointerSize;
107  static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
108
109  // Caller SP-relative.
110  static const int kParam0Offset   = -2 * kPointerSize;
111  static const int kReceiverOffset = -1 * kPointerSize;
112};
113
114
115class ArgumentsAdaptorFrameConstants : public AllStatic {
116 public:
117  static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
118  static const int kFrameSize =
119      StandardFrameConstants::kFixedFrameSize + kPointerSize;
120};
121
122
123class InternalFrameConstants : public AllStatic {
124 public:
125  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
126};
127
128
129inline Object* JavaScriptFrame::function_slot_object() const {
130  const int offset = JavaScriptFrameConstants::kFunctionOffset;
131  return Memory::Object_at(fp() + offset);
132}
133
134} }  // namespace v8::internal
135
136#endif  // V8_X64_FRAMES_X64_H_
137