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Current File : //home/ubuntu/node-v16.18.1/deps/v8/src/execution/mips/frame-constants-mips.h
// Copyright 2011 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_EXECUTION_MIPS_FRAME_CONSTANTS_MIPS_H_
#define V8_EXECUTION_MIPS_FRAME_CONSTANTS_MIPS_H_

#include "src/base/bits.h"
#include "src/base/macros.h"
#include "src/execution/frame-constants.h"

namespace v8 {
namespace internal {

class EntryFrameConstants : public AllStatic {
 public:
  // This is the offset to where JSEntry pushes the current value of
  // Isolate::c_entry_fp onto the stack.
  static constexpr int kCallerFPOffset = -3 * kSystemPointerSize;

  // Stack offsets for arguments passed to JSEntry.
  static constexpr int kArgcOffset = +0 * kSystemPointerSize;
  static constexpr int kArgvOffset = +1 * kSystemPointerSize;
};

class WasmCompileLazyFrameConstants : public TypedFrameConstants {
 public:
  static constexpr int kNumberOfSavedGpParamRegs = 3;
  static constexpr int kNumberOfSavedFpParamRegs = 7;
  static constexpr int kNumberOfSavedAllParamRegs = 10;

  // FP-relative.
  // See Generate_WasmCompileLazy in builtins-mips.cc.
  static constexpr int kWasmInstanceOffset =
      TYPED_FRAME_PUSHED_VALUE_OFFSET(kNumberOfSavedAllParamRegs);
  static constexpr int kFixedFrameSizeFromFp =
      TypedFrameConstants::kFixedFrameSizeFromFp +
      kNumberOfSavedGpParamRegs * kPointerSize +
      kNumberOfSavedFpParamRegs * kDoubleSize;
};

// Frame constructed by the {WasmDebugBreak} builtin.
// After pushing the frame type marker, the builtin pushes all Liftoff cache
// registers (see liftoff-assembler-defs.h).
class WasmDebugBreakFrameConstants : public TypedFrameConstants {
 public:
  // {v0, v1, a0, a1, a2, a3, t0, t1, t2, t3, t4, t5, t6, s7}
  static constexpr uint32_t kPushedGpRegs = 0b111111111111100 + (1 << 23);
  // {f0, f2, f4, f6, f8, f10, f12, f14, f16, f18, f20, f22, f24}
  static constexpr uint32_t kPushedFpRegs = 0b1010101010101010101010101;

  static constexpr int kNumPushedGpRegisters =
      base::bits::CountPopulation(kPushedGpRegs);
  static constexpr int kNumPushedFpRegisters =
      base::bits::CountPopulation(kPushedFpRegs);

  static constexpr int kLastPushedGpRegisterOffset =
      -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize;
  static constexpr int kLastPushedFpRegisterOffset =
      kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kDoubleSize;

  // Offsets are fp-relative.
  static int GetPushedGpRegisterOffset(int reg_code) {
    DCHECK_NE(0, kPushedGpRegs & (1 << reg_code));
    uint32_t lower_regs = kPushedGpRegs & ((uint32_t{1} << reg_code) - 1);
    return kLastPushedGpRegisterOffset +
           base::bits::CountPopulation(lower_regs) * kSystemPointerSize;
  }

  static int GetPushedFpRegisterOffset(int reg_code) {
    DCHECK_NE(0, kPushedFpRegs & (1 << reg_code));
    uint32_t lower_regs = kPushedFpRegs & ((uint32_t{1} << reg_code) - 1);
    return kLastPushedFpRegisterOffset +
           base::bits::CountPopulation(lower_regs) * kDoubleSize;
  }
};

}  // namespace internal
}  // namespace v8

#endif  // V8_EXECUTION_MIPS_FRAME_CONSTANTS_MIPS_H_

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