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/*
* Copyright (C) 2013 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_DEX_GROWABLE_ARRAY_H_
#define ART_COMPILER_DEX_GROWABLE_ARRAY_H_
#include <stdint.h>
#include <stddef.h>
#include "compiler_enums.h"
#include "arena_allocator.h"
namespace art {
struct CompilationUnit;
// Type of growable list for memory tuning.
enum OatListKind {
kGrowableArrayMisc = 0,
kGrowableArrayBlockList,
kGrowableArraySSAtoDalvikMap,
kGrowableArrayDfsOrder,
kGrowableArrayDfsPostOrder,
kGrowableArrayDomPostOrderTraversal,
kGrowableArrayThrowLaunchPads,
kGrowableArraySuspendLaunchPads,
kGrowableArraySwitchTables,
kGrowableArrayFillArrayData,
kGrowableArraySuccessorBlocks,
kGrowableArrayPredecessors,
kGNumListKinds
};
template<typename T>
class GrowableArray {
public:
class Iterator {
public:
Iterator(GrowableArray* g_list)
: idx_(0),
g_list_(g_list) {};
// NOTE: returns 0/NULL when no next.
// TODO: redo to make usage consistent with other iterators.
T Next() {
if (idx_ >= g_list_->Size()) {
return 0;
} else {
return g_list_->Get(idx_++);
}
}
void Reset() {
idx_ = 0;
}
static void* operator new(size_t size, ArenaAllocator* arena) {
return arena->NewMem(sizeof(GrowableArray::Iterator), true, ArenaAllocator::kAllocGrowableArray);
};
static void operator delete(void* p) {}; // Nop.
private:
size_t idx_;
GrowableArray* const g_list_;
};
GrowableArray(ArenaAllocator* arena, size_t init_length, OatListKind kind = kGrowableArrayMisc)
: arena_(arena),
num_allocated_(init_length),
num_used_(0),
kind_(kind) {
elem_list_ = static_cast<T*>(arena_->NewMem(sizeof(T) * init_length, true,
ArenaAllocator::kAllocGrowableArray));
};
// Expand the list size to at least new length.
void Resize(size_t new_length) {
if (new_length <= num_allocated_) return;
// If it's a small list double the size, else grow 1.5x.
size_t target_length =
(num_allocated_ < 128) ? num_allocated_ << 1 : num_allocated_ + (num_allocated_ >> 1);
if (new_length > target_length) {
target_length = new_length;
}
T* new_array = static_cast<T*>(arena_->NewMem(sizeof(T) * target_length, true,
ArenaAllocator::kAllocGrowableArray));
memcpy(new_array, elem_list_, sizeof(T) * num_allocated_);
num_allocated_ = target_length;
elem_list_ = new_array;
};
// NOTE: does not return storage, just resets use count.
void Reset() {
num_used_ = 0;
}
// Insert an element to the end of a list, resizing if necessary.
void Insert(T elem) {
if (num_used_ == num_allocated_) {
Resize(num_used_ + 1);
}
elem_list_[num_used_++] = elem;
};
T Get(size_t index) const {
DCHECK_LT(index, num_used_);
return elem_list_[index];
};
// Overwrite existing element at position index. List must be large enough.
void Put(size_t index, T elem) {
DCHECK_LT(index, num_used_);
elem_list_[index] = elem;
}
void Increment(size_t index) {
DCHECK_LT(index, num_used_);
elem_list_[index]++;
}
void Delete(T element) {
bool found = false;
for (size_t i = 0; i < num_used_ - 1; i++) {
if (!found && elem_list_[i] == element) {
found = true;
}
if (found) {
elem_list_[i] = elem_list_[i+1];
}
}
// We should either have found the element, or it was the last (unscanned) element.
DCHECK(found || (element == elem_list_[num_used_ - 1]));
num_used_--;
};
size_t GetNumAllocated() const { return num_allocated_; }
size_t Size() const { return num_used_; }
T* GetRawStorage() const { return elem_list_; }
static void* operator new(size_t size, ArenaAllocator* arena) {
return arena->NewMem(sizeof(GrowableArray<T>), true, ArenaAllocator::kAllocGrowableArray);
};
static void operator delete(void* p) {}; // Nop.
private:
ArenaAllocator* const arena_;
size_t num_allocated_;
size_t num_used_;
OatListKind kind_;
T* elem_list_;
};
} // namespace art
#endif // ART_COMPILER_DEX_GROWABLE_ARRAY_H_
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