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_EXECUTION_IA32_FRAME_CONSTANTS_IA32_H_
6#define V8_EXECUTION_IA32_FRAME_CONSTANTS_IA32_H_
7
8#include "src/base/bits.h"
9#include "src/base/macros.h"
10#include "src/codegen/register.h"
11#include "src/execution/frame-constants.h"
12
13namespace v8 {
14namespace internal {
15
16class EntryFrameConstants : public AllStatic {
17 public:
18  // This is the offset to where JSEntry pushes the current value of
19  // Isolate::c_entry_fp onto the stack.
20  static constexpr int kCallerFPOffset = -6 * kSystemPointerSize;
21
22  // EntryFrame is used by JSEntry, JSConstructEntry and JSRunMicrotasksEntry.
23  // All of them take |root_register_value| as the first parameter.
24  static constexpr int kRootRegisterValueOffset = +2 * kSystemPointerSize;
25
26  // Rest of parameters passed to JSEntry and JSConstructEntry.
27  static constexpr int kNewTargetArgOffset = +3 * kSystemPointerSize;
28  static constexpr int kFunctionArgOffset = +4 * kSystemPointerSize;
29  static constexpr int kReceiverArgOffset = +5 * kSystemPointerSize;
30  static constexpr int kArgcOffset = +6 * kSystemPointerSize;
31  static constexpr int kArgvOffset = +7 * kSystemPointerSize;
32
33  // Rest of parameters passed to JSRunMicrotasksEntry.
34  static constexpr int kMicrotaskQueueArgOffset = +3 * kSystemPointerSize;
35};
36
37class WasmCompileLazyFrameConstants : public TypedFrameConstants {
38 public:
39  static constexpr int kNumberOfSavedGpParamRegs = 4;
40  static constexpr int kNumberOfSavedFpParamRegs = 6;
41
42  // FP-relative.
43  static constexpr int kWasmInstanceOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
44  static constexpr int kFixedFrameSizeFromFp =
45      TypedFrameConstants::kFixedFrameSizeFromFp +
46      kNumberOfSavedGpParamRegs * kSystemPointerSize +
47      kNumberOfSavedFpParamRegs * kSimd128Size;
48};
49
50// Frame constructed by the {WasmDebugBreak} builtin.
51// After pushing the frame type marker, the builtin pushes all Liftoff cache
52// registers (see liftoff-assembler-defs.h).
53class WasmDebugBreakFrameConstants : public TypedFrameConstants {
54 public:
55  // Omit ebx, which is the root register.
56  static constexpr RegList kPushedGpRegs = {eax, ecx, edx, esi, edi};
57
58  // Omit xmm7, which is the kScratchDoubleReg.
59  static constexpr DoubleRegList kPushedFpRegs = {xmm0, xmm1, xmm2, xmm3,
60                                                  xmm4, xmm5, xmm6};
61
62  static constexpr int kNumPushedGpRegisters = kPushedGpRegs.Count();
63  static constexpr int kNumPushedFpRegisters = kPushedFpRegs.Count();
64
65  static constexpr int kLastPushedGpRegisterOffset =
66      -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize;
67  static constexpr int kLastPushedFpRegisterOffset =
68      kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kSimd128Size;
69
70  // Offsets are fp-relative.
71  static int GetPushedGpRegisterOffset(int reg_code) {
72    DCHECK_NE(0, kPushedGpRegs.bits() & (1 << reg_code));
73    uint32_t lower_regs =
74        kPushedGpRegs.bits() & ((uint32_t{1} << reg_code) - 1);
75    return kLastPushedGpRegisterOffset +
76           base::bits::CountPopulation(lower_regs) * kSystemPointerSize;
77  }
78
79  static int GetPushedFpRegisterOffset(int reg_code) {
80    DCHECK_NE(0, kPushedFpRegs.bits() & (1 << reg_code));
81    uint32_t lower_regs =
82        kPushedFpRegs.bits() & ((uint32_t{1} << reg_code) - 1);
83    return kLastPushedFpRegisterOffset +
84           base::bits::CountPopulation(lower_regs) * kSimd128Size;
85  }
86};
87
88}  // namespace internal
89}  // namespace v8
90
91#endif  // V8_EXECUTION_IA32_FRAME_CONSTANTS_IA32_H_
92