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frames-arm.h
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27 
28 #ifndef V8_ARM_FRAMES_ARM_H_
29 #define V8_ARM_FRAMES_ARM_H_
30 
31 namespace v8 {
32 namespace internal {
33 
34 
35 // The ARM ABI does not specify the usage of register r9, which may be reserved
36 // as the static base or thread register on some platforms, in which case we
37 // leave it alone. Adjust the value of kR9Available accordingly:
38 const int kR9Available = 1; // 1 if available to us, 0 if reserved
39 
40 
41 // Register list in load/store instructions
42 // Note that the bit values must match those used in actual instruction encoding
43 const int kNumRegs = 16;
44 
45 
46 // Caller-saved/arguments registers
48  1 << 0 | // r0 a1
49  1 << 1 | // r1 a2
50  1 << 2 | // r2 a3
51  1 << 3; // r3 a4
52 
53 const int kNumJSCallerSaved = 4;
54 
56 
57 // Return the code of the n-th caller-saved register available to JavaScript
58 // e.g. JSCallerSavedReg(0) returns r0.code() == 0
59 int JSCallerSavedCode(int n);
60 
61 
62 // Callee-saved registers preserved when switching from C to JavaScript
64  1 << 4 | // r4 v1
65  1 << 5 | // r5 v2
66  1 << 6 | // r6 v3
67  1 << 7 | // r7 v4
68  1 << 8 | // r8 v5 (cp in JavaScript code)
69  kR9Available << 9 | // r9 v6
70  1 << 10 | // r10 v7
71  1 << 11; // r11 v8 (fp in JavaScript code)
72 
73 // When calling into C++ (only for C++ calls that can't cause a GC).
74 // The call code will take care of lr, fp, etc.
76  1 << 0 | // r0
77  1 << 1 | // r1
78  1 << 2 | // r2
79  1 << 3 | // r3
80  1 << 9; // r9
81 
82 
83 const int kNumCalleeSaved = 7 + kR9Available;
84 
85 // Double registers d8 to d15 are callee-saved.
86 const int kNumDoubleCalleeSaved = 8;
87 
88 
89 // Number of registers for which space is reserved in safepoints. Must be a
90 // multiple of 8.
91 // TODO(regis): Only 8 registers may actually be sufficient. Revisit.
92 const int kNumSafepointRegisters = 16;
93 
94 // Define the list of registers actually saved at safepoints.
95 // Note that the number of saved registers may be smaller than the reserved
96 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
99 
100 // ----------------------------------------------------
101 
102 
104  public:
105  static const int kNextOffset = 0 * kPointerSize;
106  static const int kCodeOffset = 1 * kPointerSize;
107  static const int kStateOffset = 2 * kPointerSize;
108  static const int kContextOffset = 3 * kPointerSize;
109  static const int kFPOffset = 4 * kPointerSize;
110 
111  static const int kSize = kFPOffset + kPointerSize;
112 };
113 
114 
116  public:
117  static const int kCallerFPOffset = -3 * kPointerSize;
118 };
119 
120 
122  public:
123  static const int kCodeOffset = -2 * kPointerSize;
124  static const int kSPOffset = -1 * kPointerSize;
125 
126  // The caller fields are below the frame pointer on the stack.
127  static const int kCallerFPOffset = 0 * kPointerSize;
128  // The calling JS function is below FP.
129  static const int kCallerPCOffset = 1 * kPointerSize;
130 
131  // FP-relative displacement of the caller's SP. It points just
132  // below the saved PC.
133  static const int kCallerSPDisplacement = 2 * kPointerSize;
134 };
135 
136 
138  public:
139  // Fixed part of the frame consists of return address, caller fp,
140  // context and function.
141  static const int kFixedFrameSize = 4 * kPointerSize;
142  static const int kExpressionsOffset = -3 * kPointerSize;
143  static const int kMarkerOffset = -2 * kPointerSize;
144  static const int kContextOffset = -1 * kPointerSize;
145  static const int kCallerFPOffset = 0 * kPointerSize;
146  static const int kCallerPCOffset = 1 * kPointerSize;
147  static const int kCallerSPOffset = 2 * kPointerSize;
148 };
149 
150 
152  public:
153  // FP-relative.
155  static const int kLastParameterOffset = +2 * kPointerSize;
157 
158  // Caller SP-relative.
159  static const int kParam0Offset = -2 * kPointerSize;
160  static const int kReceiverOffset = -1 * kPointerSize;
161 };
162 
163 
165  public:
167  static const int kFrameSize =
169 };
170 
171 
173  public:
175 };
176 
177 
178 inline Object* JavaScriptFrame::function_slot_object() const {
180  return Memory::Object_at(fp() + offset);
181 }
182 
183 
184 } } // namespace v8::internal
185 
186 #endif // V8_ARM_FRAMES_ARM_H_
const RegList kSafepointSavedRegisters
Definition: frames-arm.h:97
static Object *& Object_at(Address addr)
Definition: v8memory.h:75
const RegList kCallerSaved
Definition: frames-arm.h:75
Definition: frames-arm.h:115
uint32_t RegList
Definition: frames.h:38
const int kNumSafepointSavedRegisters
Definition: frames-arm.h:98
const RegList kJSCallerSaved
Definition: frames-arm.h:47
int JSCallerSavedCode(int n)
Definition: frames.cc:1403
const int kNumDoubleCalleeSaved
Definition: frames-arm.h:86
static const int kCallerPCOffset
Definition: frames-arm.h:129
static const int kCallerFPOffset
Definition: frames-arm.h:127
const int kPointerSize
Definition: globals.h:220
const RegList kCalleeSaved
Definition: frames-arm.h:63
const int kNumJSCallerSaved
Definition: frames-arm.h:53
static const int kCallerSPDisplacement
Definition: frames-arm.h:133
const int kNumCalleeSaved
Definition: frames-arm.h:83
static const int kCallerFPOffset
Definition: frames-arm.h:117
const int kNumSafepointRegisters
Definition: frames-arm.h:92
Object * JSCallerSavedBuffer[kNumJSCallerSaved]
Definition: frames-arm.h:55
const int kR9Available
Definition: frames-arm.h:38
const Register fp
const int kNumRegs
Definition: frames-arm.h:43