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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 "method_info.h"
#include "nodes.h"
namespace art {
class CodeInfo;
/**
* Collects and builds stack maps for a method. All the stack maps
* for a method are placed in a CodeInfo object.
*/
class StackMapStream : public ValueObject {
public:
explicit StackMapStream(ScopedArenaAllocator* allocator, InstructionSet instruction_set)
: instruction_set_(instruction_set),
stack_maps_(allocator),
register_masks_(allocator),
stack_masks_(allocator),
invoke_infos_(allocator),
inline_infos_(allocator),
dex_register_masks_(allocator),
dex_register_maps_(allocator),
dex_register_catalog_(allocator),
out_(allocator->Adapter(kArenaAllocStackMapStream)),
method_infos_(allocator),
lazy_stack_masks_(allocator->Adapter(kArenaAllocStackMapStream)),
in_stack_map_(false),
in_inline_info_(false),
current_inline_infos_(allocator->Adapter(kArenaAllocStackMapStream)),
current_dex_registers_(allocator->Adapter(kArenaAllocStackMapStream)),
previous_dex_registers_(allocator->Adapter(kArenaAllocStackMapStream)),
dex_register_timestamp_(allocator->Adapter(kArenaAllocStackMapStream)),
temp_dex_register_mask_(allocator, 32, true, kArenaAllocStackMapStream),
temp_dex_register_map_(allocator->Adapter(kArenaAllocStackMapStream)) {
}
void BeginStackMapEntry(uint32_t dex_pc,
uint32_t native_pc_offset,
uint32_t register_mask,
BitVector* sp_mask,
uint32_t num_dex_registers,
uint8_t inlining_depth);
void EndStackMapEntry();
void AddDexRegisterEntry(DexRegisterLocation::Kind kind, int32_t value) {
current_dex_registers_.push_back(DexRegisterLocation(kind, value));
}
void AddInvoke(InvokeType type, uint32_t dex_method_index);
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);
// Prepares the stream to fill in a memory region. Must be called before FillIn.
// Returns the size (in bytes) needed to store this stream.
size_t PrepareForFillIn();
void FillInCodeInfo(MemoryRegion region);
void FillInMethodInfo(MemoryRegion region);
size_t ComputeMethodInfoSize() const;
private:
static constexpr uint32_t kNoValue = -1;
// The fields must be uint32_t and mirror the StackMap accessor in stack_map.h!
struct StackMapEntry {
uint32_t packed_native_pc;
uint32_t dex_pc;
uint32_t register_mask_index;
uint32_t stack_mask_index;
uint32_t inline_info_index;
uint32_t dex_register_mask_index;
uint32_t dex_register_map_index;
};
// The fields must be uint32_t and mirror the InlineInfo accessor in stack_map.h!
struct InlineInfoEntry {
uint32_t is_last;
uint32_t dex_pc;
uint32_t method_info_index;
uint32_t art_method_hi;
uint32_t art_method_lo;
uint32_t num_dex_registers;
};
// The fields must be uint32_t and mirror the InvokeInfo accessor in stack_map.h!
struct InvokeInfoEntry {
uint32_t packed_native_pc;
uint32_t invoke_type;
uint32_t method_info_index;
};
// The fields must be uint32_t and mirror the DexRegisterInfo accessor in stack_map.h!
struct DexRegisterEntry {
uint32_t kind;
uint32_t packed_value;
};
// The fields must be uint32_t and mirror the RegisterMask accessor in stack_map.h!
struct RegisterMaskEntry {
uint32_t value;
uint32_t shift;
};
void CreateDexRegisterMap();
const InstructionSet instruction_set_;
BitTableBuilder<StackMapEntry> stack_maps_;
BitTableBuilder<RegisterMaskEntry> register_masks_;
BitmapTableBuilder stack_masks_;
BitTableBuilder<InvokeInfoEntry> invoke_infos_;
BitTableBuilder<InlineInfoEntry> inline_infos_;
BitmapTableBuilder dex_register_masks_;
BitTableBuilder<uint32_t> dex_register_maps_;
BitTableBuilder<DexRegisterEntry> dex_register_catalog_;
uint32_t num_dex_registers_ = 0; // TODO: Make this const and get the value in constructor.
ScopedArenaVector<uint8_t> out_;
BitTableBuilder<uint32_t> method_infos_;
ScopedArenaVector<BitVector*> lazy_stack_masks_;
// Variables which track the current state between Begin/End calls;
bool in_stack_map_;
bool in_inline_info_;
StackMapEntry current_stack_map_;
ScopedArenaVector<InlineInfoEntry> 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<uint32_t> 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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