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/*
* Copyright (C) 2014 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_COMPILER_OPTIMIZING_STACK_MAP_STREAM_H_
#define ART_COMPILER_OPTIMIZING_STACK_MAP_STREAM_H_
#include "base/allocator.h"
#include "base/arena_bit_vector.h"
#include "base/bit_table.h"
#include "base/bit_vector-inl.h"
#include "base/memory_region.h"
#include "base/scoped_arena_containers.h"
#include "base/value_object.h"
#include "dex_register_location.h"
#include "nodes.h"
#include "stack_map.h"
namespace art {
/**
* Collects and builds stack maps for a method. All the stack maps
* for a method are placed in a CodeInfo object.
*/
class StackMapStream : public DeletableArenaObject<kArenaAllocStackMapStream> {
public:
explicit StackMapStream(ScopedArenaAllocator* allocator, InstructionSet instruction_set)
: allocator_(allocator),
instruction_set_(instruction_set),
stack_maps_(allocator),
register_masks_(allocator),
stack_masks_(allocator),
inline_infos_(allocator),
method_infos_(allocator),
dex_register_masks_(allocator),
dex_register_maps_(allocator),
dex_register_catalog_(allocator),
lazy_stack_masks_(allocator->Adapter(kArenaAllocStackMapStream)),
current_stack_map_(),
current_inline_infos_(allocator->Adapter(kArenaAllocStackMapStream)),
current_dex_registers_(allocator->Adapter(kArenaAllocStackMapStream)),
previous_dex_registers_(allocator->Adapter(kArenaAllocStackMapStream)),
dex_register_timestamp_(allocator->Adapter(kArenaAllocStackMapStream)),
expected_num_dex_registers_(0u),
temp_dex_register_mask_(allocator, 32, true, kArenaAllocStackMapStream),
temp_dex_register_map_(allocator->Adapter(kArenaAllocStackMapStream)) {
}
void BeginMethod(size_t frame_size_in_bytes,
size_t core_spill_mask,
size_t fp_spill_mask,
uint32_t num_dex_registers,
bool baseline = false);
void EndMethod();
void BeginStackMapEntry(uint32_t dex_pc,
uint32_t native_pc_offset,
uint32_t register_mask = 0,
BitVector* sp_mask = nullptr,
StackMap::Kind kind = StackMap::Kind::Default,
bool needs_vreg_info = true);
void EndStackMapEntry();
void AddDexRegisterEntry(DexRegisterLocation::Kind kind, int32_t value) {
current_dex_registers_.push_back(DexRegisterLocation(kind, value));
}
void BeginInlineInfoEntry(ArtMethod* method,
uint32_t dex_pc,
uint32_t num_dex_registers,
const DexFile* outer_dex_file = nullptr);
void EndInlineInfoEntry();
size_t GetNumberOfStackMaps() const {
return stack_maps_.size();
}
uint32_t GetStackMapNativePcOffset(size_t i);
void SetStackMapNativePcOffset(size_t i, uint32_t native_pc_offset);
// Encode all stack map data.
// The returned vector is allocated using the allocator passed to the StackMapStream.
ScopedArenaVector<uint8_t> Encode();
private:
static constexpr uint32_t kNoValue = -1;
void CreateDexRegisterMap();
// Invokes the callback with pointer of each BitTableBuilder field.
template<typename Callback>
void ForEachBitTable(Callback callback) {
size_t index = 0;
callback(index++, &stack_maps_);
callback(index++, ®ister_masks_);
callback(index++, &stack_masks_);
callback(index++, &inline_infos_);
callback(index++, &method_infos_);
callback(index++, &dex_register_masks_);
callback(index++, &dex_register_maps_);
callback(index++, &dex_register_catalog_);
CHECK_EQ(index, CodeInfo::kNumBitTables);
}
ScopedArenaAllocator* allocator_;
const InstructionSet instruction_set_;
uint32_t packed_frame_size_ = 0;
uint32_t core_spill_mask_ = 0;
uint32_t fp_spill_mask_ = 0;
uint32_t num_dex_registers_ = 0;
bool baseline_;
BitTableBuilder<StackMap> stack_maps_;
BitTableBuilder<RegisterMask> register_masks_;
BitmapTableBuilder stack_masks_;
BitTableBuilder<InlineInfo> inline_infos_;
BitTableBuilder<MethodInfo> method_infos_;
BitmapTableBuilder dex_register_masks_;
BitTableBuilder<DexRegisterMapInfo> dex_register_maps_;
BitTableBuilder<DexRegisterInfo> dex_register_catalog_;
ScopedArenaVector<BitVector*> lazy_stack_masks_;
// Variables which track the current state between Begin/End calls;
bool in_method_ = false;
bool in_stack_map_ = false;
bool in_inline_info_ = false;
BitTableBuilder<StackMap>::Entry current_stack_map_;
ScopedArenaVector<BitTableBuilder<InlineInfo>::Entry> current_inline_infos_;
ScopedArenaVector<DexRegisterLocation> current_dex_registers_;
ScopedArenaVector<DexRegisterLocation> previous_dex_registers_;
ScopedArenaVector<uint32_t> dex_register_timestamp_; // Stack map index of last change.
size_t expected_num_dex_registers_;
// Temporary variables used in CreateDexRegisterMap.
// They are here so that we can reuse the reserved memory.
ArenaBitVector temp_dex_register_mask_;
ScopedArenaVector<BitTableBuilder<DexRegisterMapInfo>::Entry> temp_dex_register_map_;
// A set of lambda functions to be executed at the end to verify
// the encoded data. It is generally only used in debug builds.
std::vector<std::function<void(CodeInfo&)>> dchecks_;
DISALLOW_COPY_AND_ASSIGN(StackMapStream);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_STACK_MAP_STREAM_H_
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