Re-apply: Initial check-in of an optimizing compiler.
The classes and the names are very much inspired by V8/Dart.
It currently only supports the RETURN_VOID dex instruction,
and there is a pretty printer to check if the building of the
graph is correct.
Change-Id: I28e125dfee86ae6ec9b3fec6aa1859523b92a893
diff --git a/compiler/utils/arena_allocator.h b/compiler/utils/arena_allocator.h
new file mode 100644
index 0000000..56cedfe
--- /dev/null
+++ b/compiler/utils/arena_allocator.h
@@ -0,0 +1,157 @@
+/*
+ * 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_UTILS_ARENA_ALLOCATOR_H_
+#define ART_COMPILER_UTILS_ARENA_ALLOCATOR_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include "base/mutex.h"
+#include "mem_map.h"
+
+namespace art {
+
+class Arena;
+class ArenaPool;
+class ArenaAllocator;
+
+class Arena {
+ public:
+ static constexpr size_t kDefaultSize = 128 * KB;
+ explicit Arena(size_t size = kDefaultSize);
+ ~Arena();
+ void Reset();
+ uint8_t* Begin() {
+ return memory_;
+ }
+
+ uint8_t* End() {
+ return memory_ + size_;
+ }
+
+ size_t Size() const {
+ return size_;
+ }
+
+ size_t RemainingSpace() const {
+ return Size() - bytes_allocated_;
+ }
+
+ private:
+ size_t bytes_allocated_;
+ uint8_t* memory_;
+ size_t size_;
+ MemMap* map_;
+ Arena* next_;
+ friend class ArenaPool;
+ friend class ArenaAllocator;
+ DISALLOW_COPY_AND_ASSIGN(Arena);
+};
+
+class ArenaPool {
+ public:
+ ArenaPool();
+ ~ArenaPool();
+ Arena* AllocArena(size_t size);
+ void FreeArena(Arena* arena);
+
+ private:
+ Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
+ Arena* free_arenas_ GUARDED_BY(lock_);
+ DISALLOW_COPY_AND_ASSIGN(ArenaPool);
+};
+
+class ArenaAllocator {
+ public:
+ // Type of allocation for memory tuning.
+ enum ArenaAllocKind {
+ kAllocMisc,
+ kAllocBB,
+ kAllocLIR,
+ kAllocMIR,
+ kAllocDFInfo,
+ kAllocGrowableArray,
+ kAllocGrowableBitMap,
+ kAllocDalvikToSSAMap,
+ kAllocDebugInfo,
+ kAllocSuccessor,
+ kAllocRegAlloc,
+ kAllocData,
+ kAllocPredecessors,
+ kNumAllocKinds
+ };
+
+ static constexpr bool kCountAllocations = false;
+
+ explicit ArenaAllocator(ArenaPool* pool);
+ ~ArenaAllocator();
+
+ // Returns zeroed memory.
+ void* Alloc(size_t bytes, ArenaAllocKind kind) ALWAYS_INLINE {
+ if (UNLIKELY(running_on_valgrind_)) {
+ return AllocValgrind(bytes, kind);
+ }
+ bytes = (bytes + 3) & ~3;
+ if (UNLIKELY(ptr_ + bytes > end_)) {
+ // Obtain a new block.
+ ObtainNewArenaForAllocation(bytes);
+ if (UNLIKELY(ptr_ == nullptr)) {
+ return nullptr;
+ }
+ }
+ if (kCountAllocations) {
+ alloc_stats_[kind] += bytes;
+ ++num_allocations_;
+ }
+ uint8_t* ret = ptr_;
+ ptr_ += bytes;
+ return ret;
+ }
+
+ void* AllocValgrind(size_t bytes, ArenaAllocKind kind);
+ void ObtainNewArenaForAllocation(size_t allocation_size);
+ size_t BytesAllocated() const;
+ void DumpMemStats(std::ostream& os) const;
+
+ private:
+ void UpdateBytesAllocated();
+
+ ArenaPool* pool_;
+ uint8_t* begin_;
+ uint8_t* end_;
+ uint8_t* ptr_;
+ Arena* arena_head_;
+ size_t num_allocations_;
+ size_t alloc_stats_[kNumAllocKinds]; // Bytes used by various allocation kinds.
+ bool running_on_valgrind_;
+
+ DISALLOW_COPY_AND_ASSIGN(ArenaAllocator);
+}; // ArenaAllocator
+
+struct MemStats {
+ public:
+ void Dump(std::ostream& os) const {
+ arena_.DumpMemStats(os);
+ }
+ explicit MemStats(const ArenaAllocator &arena) : arena_(arena) {}
+ private:
+ const ArenaAllocator &arena_;
+}; // MemStats
+
+} // namespace art
+
+#endif // ART_COMPILER_UTILS_ARENA_ALLOCATOR_H_