1// Copyright 2012 the V8 project authors. All rights reserved.
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3// modification, are permitted provided that the following conditions are
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27
28#ifndef V8_IA32_FRAMES_IA32_H_
29#define V8_IA32_FRAMES_IA32_H_
30
31namespace v8 {
32namespace internal {
33
34
35// Register lists
36// Note that the bit values must match those used in actual instruction encoding
37const int kNumRegs = 8;
38
39
40// Caller-saved registers
41const RegList kJSCallerSaved =
42  1 << 0 |  // eax
43  1 << 1 |  // ecx
44  1 << 2 |  // edx
45  1 << 3 |  // ebx - used as a caller-saved register in JavaScript code
46  1 << 7;   // edi - callee function
47
48const int kNumJSCallerSaved = 5;
49
50typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
51
52
53// Number of registers for which space is reserved in safepoints.
54const int kNumSafepointRegisters = 8;
55
56// ----------------------------------------------------
57
58
59class StackHandlerConstants : public AllStatic {
60 public:
61  static const int kNextOffset     = 0 * kPointerSize;
62  static const int kCodeOffset     = 1 * kPointerSize;
63  static const int kStateOffset    = 2 * kPointerSize;
64  static const int kContextOffset  = 3 * kPointerSize;
65  static const int kFPOffset       = 4 * kPointerSize;
66
67  static const int kSize = kFPOffset + kPointerSize;
68};
69
70
71class EntryFrameConstants : public AllStatic {
72 public:
73  static const int kCallerFPOffset      = -6 * kPointerSize;
74
75  static const int kFunctionArgOffset   = +3 * kPointerSize;
76  static const int kReceiverArgOffset   = +4 * kPointerSize;
77  static const int kArgcOffset          = +5 * kPointerSize;
78  static const int kArgvOffset          = +6 * kPointerSize;
79};
80
81
82class ExitFrameConstants : public AllStatic {
83 public:
84  static const int kCodeOffset     = -2 * kPointerSize;
85  static const int kSPOffset       = -1 * kPointerSize;
86
87  static const int kCallerFPOffset =  0 * kPointerSize;
88  static const int kCallerPCOffset = +1 * kPointerSize;
89
90  // FP-relative displacement of the caller's SP.  It points just
91  // below the saved PC.
92  static const int kCallerSPDisplacement = +2 * kPointerSize;
93};
94
95
96class StandardFrameConstants : public AllStatic {
97 public:
98  // Fixed part of the frame consists of return address, caller fp,
99  // context and function.
100  // StandardFrame::IterateExpressions assumes that kContextOffset is the last
101  // object pointer.
102  static const int kFixedFrameSize    =  4 * kPointerSize;
103  static const int kExpressionsOffset = -3 * kPointerSize;
104  static const int kMarkerOffset      = -2 * kPointerSize;
105  static const int kContextOffset     = -1 * kPointerSize;
106  static const int kCallerFPOffset    =  0 * kPointerSize;
107  static const int kCallerPCOffset    = +1 * kPointerSize;
108  static const int kCallerSPOffset    = +2 * kPointerSize;
109};
110
111
112class JavaScriptFrameConstants : public AllStatic {
113 public:
114  // FP-relative.
115  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
116  static const int kLastParameterOffset = +2 * kPointerSize;
117  static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
118
119  // Caller SP-relative.
120  static const int kParam0Offset   = -2 * kPointerSize;
121  static const int kReceiverOffset = -1 * kPointerSize;
122};
123
124
125class ArgumentsAdaptorFrameConstants : public AllStatic {
126 public:
127  static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
128  static const int kFrameSize =
129      StandardFrameConstants::kFixedFrameSize + kPointerSize;
130};
131
132
133class InternalFrameConstants : public AllStatic {
134 public:
135  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
136};
137
138
139inline Object* JavaScriptFrame::function_slot_object() const {
140  const int offset = JavaScriptFrameConstants::kFunctionOffset;
141  return Memory::Object_at(fp() + offset);
142}
143
144
145} }  // namespace v8::internal
146
147#endif  // V8_IA32_FRAMES_IA32_H_
148