85 lines
3.2 KiB
C++
85 lines
3.2 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_X86_JNI_FRAME_X86_H_
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#define ART_RUNTIME_ARCH_X86_JNI_FRAME_X86_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 x86 {
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constexpr size_t kFramePointerSize = static_cast<size_t>(PointerSize::k32);
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static_assert(kX86PointerSize == PointerSize::k32, "Unexpected x86 pointer size");
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static constexpr size_t kNativeStackAlignment = 16; // IA-32 cdecl requires 16 byte alignment.
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static_assert(kNativeStackAlignment == kStackAlignment);
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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_args, size_t num_long_or_double_args) {
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size_t num_arg_words = num_args + num_long_or_double_args;
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return num_arg_words * static_cast<size_t>(kX86PointerSize);
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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_long_or_double_args =
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std::count_if(shorty + 1, shorty + shorty_len, [](char c) { return c == 'J' || c == 'D'; });
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return GetNativeOutArgsSize(/*num_args=*/ shorty_len - 1u, num_long_or_double_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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// We can make a tail call if there are no stack args and the return type is not
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// FP type (needs moving from ST0 to MMX0) and we do not need to extend the result.
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bool return_type_ok = shorty[0] == 'I' || shorty[0] == 'J' || shorty[0] == 'V';
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if (return_type_ok && size == 0u) {
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return 0u;
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}
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// Add return address size.
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size += kFramePointerSize;
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return RoundUp(size, kNativeStackAlignment);
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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, kNativeStackAlignment);
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}
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} // namespace x86
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} // namespace art
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#endif // ART_RUNTIME_ARCH_X86_JNI_FRAME_X86_H_
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