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 //
6 // * Redistributions of source code must retain the above copyright
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.
12 // * Neither the name of Google Inc. nor the names of its
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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21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 #ifndef V8_IA32_FRAMES_IA32_H_
29 #define V8_IA32_FRAMES_IA32_H_
30
31 namespace v8 {
32 namespace internal {
33
34
35 // Register lists
36 // Note that the bit values must match those used in actual instruction encoding
37 const int kNumRegs = 8;
38
39
40 // Caller-saved registers
41 const 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
48 const int kNumJSCallerSaved = 5;
49
50 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
51
52
53 // Number of registers for which space is reserved in safepoints.
54 const int kNumSafepointRegisters = 8;
55
56 // ----------------------------------------------------
57
58
59 class 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
71 class 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
82 class 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
96 class 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
112 class 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
125 class ArgumentsAdaptorFrameConstants : public AllStatic {
126 public:
127 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
128 static const int kFrameSize =
129 StandardFrameConstants::kFixedFrameSize + kPointerSize;
130 };
131
132
133 class InternalFrameConstants : public AllStatic {
134 public:
135 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
136 };
137
138
function_slot_object()139 inline 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