frame-constants-ppc.h

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// Copyright 2014 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_PPC_FRAME_CONSTANTS_PPC_H_
#define V8_EXECUTION_PPC_FRAME_CONSTANTS_PPC_H_
 
#include "src/base/bits.h"
#include "src/base/macros.h"
#include "src/codegen/register.h"
#include "src/execution/frame-constants.h"
 
namespace v8 {
namespace internal {
 
class EntryFrameConstants : public AllStatic {
 public:
  // Need to take constant pool into account.
  static constexpr int kNextExitFrameFPOffset = V8_EMBEDDED_CONSTANT_POOL_BOOL
                                                    ? -4 * kSystemPointerSize
                                                    : -3 * kSystemPointerSize;
 
  static constexpr int kNextFastCallFrameFPOffset =
      kNextExitFrameFPOffset - kSystemPointerSize;
  static constexpr int kNextFastCallFramePCOffset =
      kNextFastCallFrameFPOffset - kSystemPointerSize;
};
 
class WasmLiftoffSetupFrameConstants : public TypedFrameConstants {
 public:
  // Number of gp parameters, without the instance.
  static constexpr int kNumberOfSavedGpParamRegs = 6;
  static constexpr int kNumberOfSavedFpParamRegs = 8;
 
  // There's one spilled value (which doesn't need visiting) below the instance.
  static constexpr int kInstanceSpillOffset =
      TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
 
  // Spilled registers are implicitly sorted backwards by number.
  static constexpr int kParameterSpillsOffset[] = {
      TYPED_FRAME_PUSHED_VALUE_OFFSET(7), TYPED_FRAME_PUSHED_VALUE_OFFSET(6),
      TYPED_FRAME_PUSHED_VALUE_OFFSET(5), TYPED_FRAME_PUSHED_VALUE_OFFSET(4),
      TYPED_FRAME_PUSHED_VALUE_OFFSET(3), TYPED_FRAME_PUSHED_VALUE_OFFSET(2)};
 
  // SP-relative.
  static constexpr int kWasmInstanceDataOffset = 2 * kSystemPointerSize;
  static constexpr int kDeclaredFunctionIndexOffset = 1 * kSystemPointerSize;
  static constexpr int kNativeModuleOffset = 0;
};
 
class WasmLiftoffFrameConstants : public TypedFrameConstants {
 public:
  static constexpr int kFeedbackVectorOffset =
      (V8_EMBEDDED_CONSTANT_POOL_BOOL ? 4 : 3) * kSystemPointerSize;
  static constexpr int32_t kInstanceDataOffset =
      (V8_EMBEDDED_CONSTANT_POOL_BOOL ? 3 : 2) * kSystemPointerSize;
};
 
// 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:
  static constexpr RegList kPushedGpRegs = {r3, r4,  r5,  r6,  r7, r8,
                                            r9, r10, r11, r15, cp};
 
  static constexpr DoubleRegList kPushedFpRegs = {d0, d1, d2, d3,  d4,  d5, d6,
                                                  d7, d8, d9, d10, d11, d12};
 
  static constexpr Simd128RegList kPushedSimd128Regs = {
      v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12};
 
  static constexpr int kNumPushedGpRegisters = kPushedGpRegs.Count();
  static constexpr int kNumPushedFpRegisters = kPushedFpRegs.Count();
 
  static constexpr int kLastPushedGpRegisterOffset =
      -TypedFrameConstants::kFixedFrameSizeFromFp -
      kSystemPointerSize * kNumPushedGpRegisters;
  static constexpr int kLastPushedFpRegisterOffset =
      kLastPushedGpRegisterOffset - kDoubleSize * kNumPushedFpRegisters;
 
  // Offsets are fp-relative.
  static int GetPushedGpRegisterOffset(int reg_code) {
    DCHECK_NE(0, kPushedGpRegs.bits() & (1 << reg_code));
    uint32_t lower_regs =
        kPushedGpRegs.bits() & ((uint32_t{1} << reg_code) - 1);
    return kLastPushedGpRegisterOffset +
           base::bits::CountPopulation(lower_regs) * kSystemPointerSize;
  }
 
  static int GetPushedFpRegisterOffset(int reg_code) {
    DCHECK_NE(0, kPushedFpRegs.bits() & (1 << reg_code));
    uint32_t lower_regs =
        kPushedFpRegs.bits() & ((uint32_t{1} << reg_code) - 1);
    return kLastPushedFpRegisterOffset +
           base::bits::CountPopulation(lower_regs) * kSimd128Size;
  }
};
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_EXECUTION_PPC_FRAME_CONSTANTS_PPC_H_