1// Copyright 2012 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_X87_FRAMES_X87_H_
6#define V8_X87_FRAMES_X87_H_
7
8namespace v8 {
9namespace internal {
10
11
12// Register lists
13// Note that the bit values must match those used in actual instruction encoding
14const int kNumRegs = 8;
15
16
17// Caller-saved registers
18const RegList kJSCallerSaved =
19  1 << 0 |  // eax
20  1 << 1 |  // ecx
21  1 << 2 |  // edx
22  1 << 3 |  // ebx - used as a caller-saved register in JavaScript code
23  1 << 7;   // edi - callee function
24
25const int kNumJSCallerSaved = 5;
26
27
28// Number of registers for which space is reserved in safepoints.
29const int kNumSafepointRegisters = 8;
30
31// ----------------------------------------------------
32
33
34class EntryFrameConstants : public AllStatic {
35 public:
36  static const int kCallerFPOffset      = -6 * kPointerSize;
37
38  static const int kNewTargetArgOffset = +2 * kPointerSize;
39  static const int kFunctionArgOffset   = +3 * kPointerSize;
40  static const int kReceiverArgOffset   = +4 * kPointerSize;
41  static const int kArgcOffset          = +5 * kPointerSize;
42  static const int kArgvOffset          = +6 * kPointerSize;
43};
44
45class ExitFrameConstants : public TypedFrameConstants {
46 public:
47  static const int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
48  static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
49  DEFINE_TYPED_FRAME_SIZES(2);
50
51  static const int kCallerFPOffset =  0 * kPointerSize;
52  static const int kCallerPCOffset = +1 * kPointerSize;
53
54  // FP-relative displacement of the caller's SP.  It points just
55  // below the saved PC.
56  static const int kCallerSPDisplacement = +2 * kPointerSize;
57
58  static const int kConstantPoolOffset   = 0;  // Not used
59};
60
61
62class JavaScriptFrameConstants : public AllStatic {
63 public:
64  // FP-relative.
65  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
66  static const int kLastParameterOffset = +2 * kPointerSize;
67  static const int kFunctionOffset = StandardFrameConstants::kFunctionOffset;
68
69  // Caller SP-relative.
70  static const int kParam0Offset   = -2 * kPointerSize;
71  static const int kReceiverOffset = -1 * kPointerSize;
72};
73
74
75}  // namespace internal
76}  // namespace v8
77
78#endif  // V8_X87_FRAMES_X87_H_
79