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// 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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