89 lines
3.4 KiB
C++
89 lines
3.4 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_ARM_JNI_FRAME_ARM_H_
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#define ART_RUNTIME_ARCH_ARM_JNI_FRAME_ARM_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 arm {
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constexpr size_t kFramePointerSize = static_cast<size_t>(PointerSize::k32);
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static_assert(kArmPointerSize == PointerSize::k32, "Unexpected ARM pointer size");
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// The AAPCS requires 8-byte alignment. This is not as strict as the Managed ABI stack alignment.
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static constexpr size_t kAapcsStackAlignment = 8u;
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static_assert(kAapcsStackAlignment < kStackAlignment);
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// How many registers can be used for passing arguments.
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// Note: AAPCS is soft-float, so these are all core registers.
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constexpr size_t kJniArgumentRegisterCount = 4u;
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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 reg = 0; // Register for the current argument; if reg >= 4, we shall use stack.
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for (size_t i = 1; i != shorty_len; ++i) {
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if (shorty[i] == 'J' || shorty[i] == 'D') {
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// 8-byte args need to start in even-numbered register or at aligned stack position.
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reg += (reg & 1);
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// Count first word and let the common path count the second.
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reg += 1u;
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}
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reg += 1u;
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}
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size_t stack_args = std::max(reg, kJniArgumentRegisterCount) - kJniArgumentRegisterCount;
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return kFramePointerSize * stack_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 frame emitted by the JNI 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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// Check if this is a tail call, i.e. there are no stack args and the return type
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// is not an FP type (otherwise we need to move the result to FP register).
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// No need to sign/zero extend small return types thanks to AAPCS.
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if (size != 0u || shorty[0] == 'F' || shorty[0] == 'D') {
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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, kAapcsStackAlignment);
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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 extra frame emitted by the 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 and FP value moves are handled by the caller.
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return RoundUp(size, kAapcsStackAlignment);
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}
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} // namespace arm
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} // namespace art
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#endif // ART_RUNTIME_ARCH_ARM_JNI_FRAME_ARM_H_
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