1 // Copyright 2006-2008 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
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 static const int kNumRegs = 8;
38
39
40 // Caller-saved registers
41 static 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 static const int kNumJSCallerSaved = 5;
49
50 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
51
52 // ----------------------------------------------------
53
54
55 class StackHandlerConstants : public AllStatic {
56 public:
57 static const int kNextOffset = 0 * kPointerSize;
58 static const int kFPOffset = 1 * kPointerSize;
59 static const int kStateOffset = 2 * kPointerSize;
60 static const int kPCOffset = 3 * kPointerSize;
61
62 static const int kSize = kPCOffset + kPointerSize;
63 };
64
65
66 class EntryFrameConstants : public AllStatic {
67 public:
68 static const int kCallerFPOffset = -6 * kPointerSize;
69
70 static const int kFunctionArgOffset = +3 * kPointerSize;
71 static const int kReceiverArgOffset = +4 * kPointerSize;
72 static const int kArgcOffset = +5 * kPointerSize;
73 static const int kArgvOffset = +6 * kPointerSize;
74 };
75
76
77 class ExitFrameConstants : public AllStatic {
78 public:
79 static const int kCodeOffset = -2 * kPointerSize;
80 static const int kSPOffset = -1 * kPointerSize;
81
82 static const int kCallerFPOffset = 0 * kPointerSize;
83 static const int kCallerPCOffset = +1 * kPointerSize;
84
85 // FP-relative displacement of the caller's SP. It points just
86 // below the saved PC.
87 static const int kCallerSPDisplacement = +2 * kPointerSize;
88 };
89
90
91 class StandardFrameConstants : public AllStatic {
92 public:
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
102 class JavaScriptFrameConstants : public AllStatic {
103 public:
104 // FP-relative.
105 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
106 static const int kSavedRegistersOffset = +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
115 class ArgumentsAdaptorFrameConstants : public AllStatic {
116 public:
117 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
118 };
119
120
121 class InternalFrameConstants : public AllStatic {
122 public:
123 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
124 };
125
126
function_slot_object()127 inline Object* JavaScriptFrame::function_slot_object() const {
128 const int offset = JavaScriptFrameConstants::kFunctionOffset;
129 return Memory::Object_at(fp() + offset);
130 }
131
132
133 } } // namespace v8::internal
134
135 #endif // V8_IA32_FRAMES_IA32_H_
136