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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_LOONG64_FRAME_CONSTANTS_LOONG64_H_
#define V8_EXECUTION_LOONG64_FRAME_CONSTANTS_LOONG64_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:
// This is the offset to where JSEntry pushes the current value of
// Isolate::c_entry_fp onto the stack.
static constexpr int kNextExitFrameFPOffset = -3 * kSystemPointerSize;
};
class WasmLiftoffSetupFrameConstants : public TypedFrameConstants {
public:
// Number of gp parameters, without the instance.
static constexpr int kNumberOfSavedGpParamRegs = 6;
static constexpr int kNumberOfSavedFpParamRegs = 8;
static constexpr int kNumberOfSavedAllParamRegs = 14;
// On loong64, spilled registers are implicitly sorted backwards by number.
// We spill:
// a2, a3, a4, a5, a6, a7: param1, param2, ..., param6
// in the following FP-relative order: [a7, a6, a5, a4, a3, a2].
// The instance slot is in position '6', the first spill slot is at '0'.
static constexpr int kInstanceSpillOffset =
TYPED_FRAME_PUSHED_VALUE_OFFSET(6);
static constexpr int kParameterSpillsOffset[] = {
TYPED_FRAME_PUSHED_VALUE_OFFSET(5), TYPED_FRAME_PUSHED_VALUE_OFFSET(4),
TYPED_FRAME_PUSHED_VALUE_OFFSET(3), TYPED_FRAME_PUSHED_VALUE_OFFSET(2),
TYPED_FRAME_PUSHED_VALUE_OFFSET(1), TYPED_FRAME_PUSHED_VALUE_OFFSET(0)};
// SP-relative.
static constexpr int kWasmInstanceOffset = 2 * kSystemPointerSize;
static constexpr int kDeclaredFunctionIndexOffset = 1 * kSystemPointerSize;
static constexpr int kNativeModuleOffset = 0;
};
// 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:
// {a0 ... a7, t0 ... t5, s0, s1, s2, s5, s7}
static constexpr RegList kPushedGpRegs = {a0, a1, a2, a3, a4, a5, a6,
a7, t0, t1, t2, t3, t4, t5,
s0, s1, s2, s5, s7};
// {f0, f1, f2, ... f27, f28}
static constexpr DoubleRegList kPushedFpRegs = {
f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14,
f15, f16, f17, f18, f19, f20, f21, f22, f23, f24, f25, f26, f27, f28};
static constexpr int kNumPushedGpRegisters = kPushedGpRegs.Count();
static constexpr int kNumPushedFpRegisters = kPushedFpRegs.Count();
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.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) * kDoubleSize;
}
};
} // namespace internal
} // namespace v8
#endif // V8_EXECUTION_LOONG64_FRAME_CONSTANTS_LOONG64_H_
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