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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_OAT_QUICK_METHOD_HEADER_H_
#define ART_RUNTIME_OAT_QUICK_METHOD_HEADER_H_
#include "arch/instruction_set.h"
#include "base/locks.h"
#include "base/macros.h"
#include "base/utils.h"
#include "quick/quick_method_frame_info.h"
#include "stack_map.h"
namespace art {
class ArtMethod;
// OatQuickMethodHeader precedes the raw code chunk generated by the compiler.
class PACKED(4) OatQuickMethodHeader {
public:
OatQuickMethodHeader() = default;
OatQuickMethodHeader(uint32_t vmap_table_offset,
uint32_t code_size)
: vmap_table_offset_(vmap_table_offset),
code_size_(code_size) {
}
static OatQuickMethodHeader* NterpMethodHeader;
bool IsNterpMethodHeader() const;
static OatQuickMethodHeader* FromCodePointer(const void* code_ptr) {
uintptr_t code = reinterpret_cast<uintptr_t>(code_ptr);
uintptr_t header = code - OFFSETOF_MEMBER(OatQuickMethodHeader, code_);
DCHECK(IsAlignedParam(code, GetInstructionSetAlignment(kRuntimeISA)) ||
IsAlignedParam(header, GetInstructionSetAlignment(kRuntimeISA)))
<< std::hex << code << " " << std::hex << header;
return reinterpret_cast<OatQuickMethodHeader*>(header);
}
static OatQuickMethodHeader* FromEntryPoint(const void* entry_point) {
return FromCodePointer(EntryPointToCodePointer(entry_point));
}
static size_t InstructionAlignedSize() {
return RoundUp(sizeof(OatQuickMethodHeader), GetInstructionSetAlignment(kRuntimeISA));
}
OatQuickMethodHeader(const OatQuickMethodHeader&) = default;
OatQuickMethodHeader& operator=(const OatQuickMethodHeader&) = default;
uintptr_t NativeQuickPcOffset(const uintptr_t pc) const {
return pc - reinterpret_cast<uintptr_t>(GetEntryPoint());
}
bool IsOptimized() const {
return GetCodeSize() != 0 && vmap_table_offset_ != 0;
}
const uint8_t* GetOptimizedCodeInfoPtr() const {
DCHECK(IsOptimized());
return code_ - vmap_table_offset_;
}
uint8_t* GetOptimizedCodeInfoPtr() {
DCHECK(IsOptimized());
return code_ - vmap_table_offset_;
}
const uint8_t* GetCode() const {
return code_;
}
uint32_t GetCodeSize() const {
// ART compiled method are prefixed with header, but we can also easily
// accidentally use a function pointer to one of the stubs/trampolines.
// We prefix those with 0xFF in the aseembly so that we can do DCHECKs.
CHECK_NE(code_size_, 0xFFFFFFFF) << code_size_;
return code_size_ & kCodeSizeMask;
}
const uint32_t* GetCodeSizeAddr() const {
return &code_size_;
}
uint32_t GetVmapTableOffset() const {
return vmap_table_offset_;
}
void SetVmapTableOffset(uint32_t offset) {
vmap_table_offset_ = offset;
}
const uint32_t* GetVmapTableOffsetAddr() const {
return &vmap_table_offset_;
}
const uint8_t* GetVmapTable() const {
CHECK(!IsOptimized()) << "Unimplemented vmap table for optimizing compiler";
return (vmap_table_offset_ == 0) ? nullptr : code_ - vmap_table_offset_;
}
bool Contains(uintptr_t pc) const {
uintptr_t code_start = reinterpret_cast<uintptr_t>(code_);
static_assert(kRuntimeISA != InstructionSet::kThumb2, "kThumb2 cannot be a runtime ISA");
if (kRuntimeISA == InstructionSet::kArm) {
// On Thumb-2, the pc is offset by one.
code_start++;
}
return code_start <= pc && pc <= (code_start + GetCodeSize());
}
const uint8_t* GetEntryPoint() const {
// When the runtime architecture is ARM, `kRuntimeISA` is set to `kArm`
// (not `kThumb2`), *but* we always generate code for the Thumb-2
// instruction set anyway. Thumb-2 requires the entrypoint to be of
// offset 1.
static_assert(kRuntimeISA != InstructionSet::kThumb2, "kThumb2 cannot be a runtime ISA");
return (kRuntimeISA == InstructionSet::kArm)
? reinterpret_cast<uint8_t*>(reinterpret_cast<uintptr_t>(code_) | 1)
: code_;
}
template <bool kCheckFrameSize = true>
uint32_t GetFrameSizeInBytes() const {
uint32_t result = GetFrameInfo().FrameSizeInBytes();
if (kCheckFrameSize) {
DCHECK_ALIGNED(result, kStackAlignment);
}
return result;
}
QuickMethodFrameInfo GetFrameInfo() const {
DCHECK(IsOptimized());
return CodeInfo::DecodeFrameInfo(GetOptimizedCodeInfoPtr());
}
uintptr_t ToNativeQuickPc(ArtMethod* method,
const uint32_t dex_pc,
bool is_for_catch_handler,
bool abort_on_failure = true) const;
uint32_t ToDexPc(ArtMethod** frame,
const uintptr_t pc,
bool abort_on_failure = true) const
REQUIRES_SHARED(Locks::mutator_lock_);
void SetHasShouldDeoptimizeFlag() {
DCHECK_EQ(code_size_ & kShouldDeoptimizeMask, 0u);
code_size_ |= kShouldDeoptimizeMask;
}
bool HasShouldDeoptimizeFlag() const {
return (code_size_ & kShouldDeoptimizeMask) != 0;
}
private:
static constexpr uint32_t kShouldDeoptimizeMask = 0x80000000;
static constexpr uint32_t kCodeSizeMask = ~kShouldDeoptimizeMask;
// The offset in bytes from the start of the vmap table to the end of the header.
uint32_t vmap_table_offset_ = 0u;
// The code size in bytes. The highest bit is used to signify if the compiled
// code with the method header has should_deoptimize flag.
uint32_t code_size_ = 0u;
// The actual code.
uint8_t code_[0];
};
} // namespace art
#endif // ART_RUNTIME_OAT_QUICK_METHOD_HEADER_H_
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