96 lines
3.9 KiB
C++
96 lines
3.9 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_ARCH_ARM64_JNI_FRAME_ARM64_H_
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#define ART_RUNTIME_ARCH_ARM64_JNI_FRAME_ARM64_H_
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#include <string.h>
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#include "arch/instruction_set.h"
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#include "base/bit_utils.h"
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#include "base/globals.h"
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#include "base/logging.h"
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namespace art {
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namespace arm64 {
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constexpr size_t kFramePointerSize = static_cast<size_t>(PointerSize::k64);
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static_assert(kArm64PointerSize == PointerSize::k64, "Unexpected ARM64 pointer size");
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// The AAPCS64 requires 16-byte alignment. This is the same as the Managed ABI stack alignment.
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static constexpr size_t kAapcs64StackAlignment = 16u;
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static_assert(kAapcs64StackAlignment == kStackAlignment);
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// Up to how many float-like (float, double) args can be in registers.
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// The rest of the args must go on the stack.
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constexpr size_t kMaxFloatOrDoubleRegisterArguments = 8u;
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// Up to how many integer-like (pointers, objects, longs, int, short, bool, etc) args can be
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// in registers. The rest of the args must go on the stack.
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constexpr size_t kMaxIntLikeRegisterArguments = 8u;
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// Get the size of the arguments for a native call.
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inline size_t GetNativeOutArgsSize(size_t num_fp_args, size_t num_non_fp_args) {
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// Account for FP arguments passed through v0-v7.
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size_t num_stack_fp_args =
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num_fp_args - std::min(kMaxFloatOrDoubleRegisterArguments, num_fp_args);
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// Account for other (integer and pointer) arguments passed through GPR (x0-x7).
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size_t num_stack_non_fp_args =
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num_non_fp_args - std::min(kMaxIntLikeRegisterArguments, num_non_fp_args);
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// Each stack argument takes 8 bytes.
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return (num_stack_fp_args + num_stack_non_fp_args) * static_cast<size_t>(kArm64PointerSize);
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}
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// Get stack args size for @CriticalNative method calls.
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inline size_t GetCriticalNativeCallArgsSize(const char* shorty, uint32_t shorty_len) {
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DCHECK_EQ(shorty_len, strlen(shorty));
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size_t num_fp_args =
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std::count_if(shorty + 1, shorty + shorty_len, [](char c) { return c == 'F' || c == 'D'; });
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size_t num_non_fp_args = shorty_len - 1u - num_fp_args;
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return GetNativeOutArgsSize(num_fp_args, num_non_fp_args);
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}
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// Get the frame size for @CriticalNative method stub.
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// This must match the size of the extra frame emitted by the compiler at the native call site.
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inline size_t GetCriticalNativeStubFrameSize(const char* shorty, uint32_t shorty_len) {
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// The size of outgoing arguments.
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size_t size = GetCriticalNativeCallArgsSize(shorty, shorty_len);
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// We can make a tail call if there are no stack args and we do not need
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// to extend the result. Otherwise, add space for return PC.
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if (size != 0u || shorty[0] == 'B' || shorty[0] == 'C' || shorty[0] == 'S' || shorty[0] == 'Z') {
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size += kFramePointerSize; // We need to spill LR with the args.
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}
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return RoundUp(size, kAapcs64StackAlignment);
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}
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// Get the frame size for direct call to a @CriticalNative method.
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// This must match the size of the frame emitted by the JNI compiler at the native call site.
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inline size_t GetCriticalNativeDirectCallFrameSize(const char* shorty, uint32_t shorty_len) {
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// The size of outgoing arguments.
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size_t size = GetCriticalNativeCallArgsSize(shorty, shorty_len);
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// No return PC to save, zero- and sign-extension are handled by the caller.
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return RoundUp(size, kAapcs64StackAlignment);
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}
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} // namespace arm64
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} // namespace art
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#endif // ART_RUNTIME_ARCH_ARM64_JNI_FRAME_ARM64_H_
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