1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
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28 #ifndef V8_IA32_FRAMES_IA32_H_
29 #define V8_IA32_FRAMES_IA32_H_
38 // Note that the bit values must match those used in actual instruction encoding
39 static const int kNumRegs = 8;
42 // Caller-saved registers
43 static const RegList kJSCallerSaved =
47 1 << 3 | // ebx - used as a caller-saved register in JavaScript code
48 1 << 7; // edi - callee function
50 static const int kNumJSCallerSaved = 5;
52 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
55 // Number of registers for which space is reserved in safepoints.
56 static const int kNumSafepointRegisters = 8;
58 // ----------------------------------------------------
61 class StackHandlerConstants : public AllStatic {
63 static const int kNextOffset = 0 * kPointerSize;
64 static const int kFPOffset = 1 * kPointerSize;
65 static const int kStateOffset = 2 * kPointerSize;
66 static const int kPCOffset = 3 * kPointerSize;
68 static const int kSize = kPCOffset + kPointerSize;
72 class EntryFrameConstants : public AllStatic {
74 static const int kCallerFPOffset = -6 * kPointerSize;
76 static const int kFunctionArgOffset = +3 * kPointerSize;
77 static const int kReceiverArgOffset = +4 * kPointerSize;
78 static const int kArgcOffset = +5 * kPointerSize;
79 static const int kArgvOffset = +6 * kPointerSize;
83 class ExitFrameConstants : public AllStatic {
85 static const int kCodeOffset = -2 * kPointerSize;
86 static const int kSPOffset = -1 * kPointerSize;
88 static const int kCallerFPOffset = 0 * kPointerSize;
89 static const int kCallerPCOffset = +1 * kPointerSize;
91 // FP-relative displacement of the caller's SP. It points just
92 // below the saved PC.
93 static const int kCallerSPDisplacement = +2 * kPointerSize;
97 class StandardFrameConstants : public AllStatic {
99 static const int kFixedFrameSize = 4;
100 static const int kExpressionsOffset = -3 * kPointerSize;
101 static const int kMarkerOffset = -2 * kPointerSize;
102 static const int kContextOffset = -1 * kPointerSize;
103 static const int kCallerFPOffset = 0 * kPointerSize;
104 static const int kCallerPCOffset = +1 * kPointerSize;
105 static const int kCallerSPOffset = +2 * kPointerSize;
109 class JavaScriptFrameConstants : public AllStatic {
112 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
113 static const int kSavedRegistersOffset = +2 * kPointerSize;
114 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
116 // Caller SP-relative.
117 static const int kParam0Offset = -2 * kPointerSize;
118 static const int kReceiverOffset = -1 * kPointerSize;
122 class ArgumentsAdaptorFrameConstants : public AllStatic {
124 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
128 class InternalFrameConstants : public AllStatic {
130 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
134 inline Object* JavaScriptFrame::function_slot_object() const {
135 const int offset = JavaScriptFrameConstants::kFunctionOffset;
136 return Memory::Object_at(fp() + offset);
140 } } // namespace v8::internal
142 #endif // V8_IA32_FRAMES_IA32_H_