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// Copyright 2021 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_RISCV64_FRAME_CONSTANTS_RISCV64_H_
#define V8_EXECUTION_RISCV64_FRAME_CONSTANTS_RISCV64_H_
#include "src/base/bits.h"
#include "src/base/macros.h"
#include "src/execution/frame-constants.h"
#include "src/wasm/baseline/liftoff-assembler-defs.h"
#include "src/wasm/wasm-linkage.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;
};
class WasmCompileLazyFrameConstants : public TypedFrameConstants {
public:
static constexpr int kNumberOfSavedGpParamRegs =
arraysize(wasm::kGpParamRegisters);
static constexpr int kNumberOfSavedFpParamRegs =
arraysize(wasm::kFpParamRegisters);
static constexpr int kNumberOfSavedAllParamRegs =
kNumberOfSavedGpParamRegs + kNumberOfSavedFpParamRegs;
// FP-relative.
// See Generate_WasmCompileLazy in builtins-mips64.cc.
static constexpr int kWasmInstanceOffset =
TYPED_FRAME_PUSHED_VALUE_OFFSET(kNumberOfSavedAllParamRegs);
static constexpr int kFixedFrameSizeFromFp =
TypedFrameConstants::kFixedFrameSizeFromFp +
kNumberOfSavedGpParamRegs * kSystemPointerSize +
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:
// constexpr RegList kLiftoffAssemblerGpCacheRegs =
// Register::ListOf(a0, a1, a2, a3, a4, a5, a6, a7, t0, t1, t2, s7);
static constexpr uint32_t kPushedGpRegs = wasm::kLiftoffAssemblerGpCacheRegs;
// constexpr RegList kLiftoffAssemblerFpCacheRegs = DoubleRegister::ListOf(
// ft0, ft1, ft2, ft3, ft4, ft5, ft6, ft7, fa0, fa1, fa2, fa3, fa4, fa5,
// fa6, fa7, ft8, ft9, ft10, ft11);
static constexpr uint32_t kPushedFpRegs = wasm::kLiftoffAssemblerFpCacheRegs;
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_RISCV64_FRAME_CONSTANTS_RISCV64_H_
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