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_X64_FRAMES_X64_H_
6#define V8_X64_FRAMES_X64_H_
7
8namespace v8 {
9namespace internal {
10
11const int kNumRegs = 16;
12const RegList kJSCallerSaved =
13    1 << 0 |  // rax
14    1 << 1 |  // rcx
15    1 << 2 |  // rdx
16    1 << 3 |  // rbx - used as a caller-saved register in JavaScript code
17    1 << 7;   // rdi - callee function
18
19const int kNumJSCallerSaved = 5;
20
21// Number of registers for which space is reserved in safepoints.
22const int kNumSafepointRegisters = 16;
23
24// ----------------------------------------------------
25
26class EntryFrameConstants : public AllStatic {
27 public:
28#ifdef _WIN64
29  static const int kCalleeSaveXMMRegisters = 10;
30  static const int kXMMRegisterSize = 16;
31  static const int kXMMRegistersBlockSize =
32      kXMMRegisterSize * kCalleeSaveXMMRegisters;
33  static const int kCallerFPOffset =
34      -3 * kPointerSize + -7 * kRegisterSize - kXMMRegistersBlockSize;
35#else
36  // We have 3 Push and 5 pushq in the JSEntryStub::GenerateBody.
37  static const int kCallerFPOffset = -3 * kPointerSize + -5 * kRegisterSize;
38#endif
39  static const int kArgvOffset     = 6 * kPointerSize;
40};
41
42
43class ExitFrameConstants : public AllStatic {
44 public:
45  static const int kFrameSize       = 2 * kPointerSize;
46
47  static const int kCodeOffset      = -2 * kPointerSize;
48  static const int kSPOffset        = -1 * kPointerSize;
49
50  static const int kCallerFPOffset  = +0 * kPointerSize;
51  static const int kCallerPCOffset  = kFPOnStackSize;
52
53  // FP-relative displacement of the caller's SP.  It points just
54  // below the saved PC.
55  static const int kCallerSPDisplacement = kCallerPCOffset + kPCOnStackSize;
56
57  static const int kConstantPoolOffset   = 0;  // Not used
58};
59
60
61class JavaScriptFrameConstants : public AllStatic {
62 public:
63  // FP-relative.
64  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
65  static const int kLastParameterOffset = kFPOnStackSize + kPCOnStackSize;
66  static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
67
68  // Caller SP-relative.
69  static const int kParam0Offset   = -2 * kPointerSize;
70  static const int kReceiverOffset = -1 * kPointerSize;
71};
72
73
74class ArgumentsAdaptorFrameConstants : public AllStatic {
75 public:
76  // FP-relative.
77  static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
78
79  static const int kFrameSize =
80      StandardFrameConstants::kFixedFrameSize + kPointerSize;
81};
82
83
84class ConstructFrameConstants : public AllStatic {
85 public:
86  // FP-relative.
87  static const int kImplicitReceiverOffset = -5 * kPointerSize;
88  static const int kConstructorOffset      = kMinInt;
89  static const int kLengthOffset           = -4 * kPointerSize;
90  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
91
92  static const int kFrameSize =
93      StandardFrameConstants::kFixedFrameSize + 3 * kPointerSize;
94};
95
96
97class InternalFrameConstants : public AllStatic {
98 public:
99  // FP-relative.
100  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
101};
102
103
104inline Object* JavaScriptFrame::function_slot_object() const {
105  const int offset = JavaScriptFrameConstants::kFunctionOffset;
106  return Memory::Object_at(fp() + offset);
107}
108
109
110inline void StackHandler::SetFp(Address slot, Address fp) {
111  if (kFPOnStackSize == 2 * kPointerSize) {
112    // Zero out the high-32 bit of FP for x32 port.
113    Memory::Address_at(slot + kPointerSize) = 0;
114  }
115  Memory::Address_at(slot) = fp;
116}
117
118
119} }  // namespace v8::internal
120
121#endif  // V8_X64_FRAMES_X64_H_
122