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/*
* Copyright (C) 2015 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_JIT_PROFILING_INFO_H_
#define ART_RUNTIME_JIT_PROFILING_INFO_H_
#include <vector>
#include "base/macros.h"
#include "gc_root.h"
namespace art {
class ArtMethod;
class ProfilingInfo;
namespace jit {
class JitCodeCache;
}
namespace mirror {
class Class;
}
// Structure to store the classes seen at runtime for a specific instruction.
// Once the classes_ array is full, we consider the INVOKE to be megamorphic.
class InlineCache {
public:
bool IsMonomorphic() const {
DCHECK_GE(kIndividualCacheSize, 2);
return !classes_[0].IsNull() && classes_[1].IsNull();
}
bool IsMegamorphic() const {
for (size_t i = 0; i < kIndividualCacheSize; ++i) {
if (classes_[i].IsNull()) {
return false;
}
}
return true;
}
mirror::Class* GetMonomorphicType() const SHARED_REQUIRES(Locks::mutator_lock_) {
// Note that we cannot ensure the inline cache is actually monomorphic
// at this point, as other threads may have updated it.
DCHECK(!classes_[0].IsNull());
return classes_[0].Read();
}
bool IsUninitialized() const {
return classes_[0].IsNull();
}
bool IsPolymorphic() const {
DCHECK_GE(kIndividualCacheSize, 3);
return !classes_[1].IsNull() && classes_[kIndividualCacheSize - 1].IsNull();
}
mirror::Class* GetTypeAt(size_t i) const SHARED_REQUIRES(Locks::mutator_lock_) {
return classes_[i].Read();
}
static constexpr uint16_t kIndividualCacheSize = 5;
private:
uint32_t dex_pc_;
GcRoot<mirror::Class> classes_[kIndividualCacheSize];
friend class ProfilingInfo;
DISALLOW_COPY_AND_ASSIGN(InlineCache);
};
/**
* Profiling info for a method, created and filled by the interpreter once the
* method is warm, and used by the compiler to drive optimizations.
*/
class ProfilingInfo {
public:
// Create a ProfilingInfo for 'method'. Return whether it succeeded, or if it is
// not needed in case the method does not have virtual/interface invocations.
static bool Create(Thread* self, ArtMethod* method, bool retry_allocation)
SHARED_REQUIRES(Locks::mutator_lock_);
// Add information from an executed INVOKE instruction to the profile.
void AddInvokeInfo(uint32_t dex_pc, mirror::Class* cls)
// Method should not be interruptible, as it manipulates the ProfilingInfo
// which can be concurrently collected.
REQUIRES(Roles::uninterruptible_)
SHARED_REQUIRES(Locks::mutator_lock_);
// NO_THREAD_SAFETY_ANALYSIS since we don't know what the callback requires.
template<typename RootVisitorType>
void VisitRoots(RootVisitorType& visitor) NO_THREAD_SAFETY_ANALYSIS {
for (size_t i = 0; i < number_of_inline_caches_; ++i) {
InlineCache* cache = &cache_[i];
for (size_t j = 0; j < InlineCache::kIndividualCacheSize; ++j) {
visitor.VisitRootIfNonNull(cache->classes_[j].AddressWithoutBarrier());
}
}
}
ArtMethod* GetMethod() const {
return method_;
}
InlineCache* GetInlineCache(uint32_t dex_pc);
bool IsMethodBeingCompiled() const {
return is_method_being_compiled_;
}
void SetIsMethodBeingCompiled(bool value) {
is_method_being_compiled_ = value;
}
void SetSavedEntryPoint(const void* entry_point) {
saved_entry_point_ = entry_point;
}
const void* GetSavedEntryPoint() const {
return saved_entry_point_;
}
void ClearGcRootsInInlineCaches() {
for (size_t i = 0; i < number_of_inline_caches_; ++i) {
InlineCache* cache = &cache_[i];
memset(&cache->classes_[0],
0,
InlineCache::kIndividualCacheSize * sizeof(GcRoot<mirror::Class>));
}
}
void IncrementInlineUse() {
DCHECK_NE(current_inline_uses_, std::numeric_limits<uint16_t>::max());
current_inline_uses_++;
}
void DecrementInlineUse() {
DCHECK_GT(current_inline_uses_, 0);
current_inline_uses_--;
}
bool IsInUseByCompiler() const {
return IsMethodBeingCompiled() || (current_inline_uses_ > 0);
}
private:
ProfilingInfo(ArtMethod* method, const std::vector<uint32_t>& entries)
: number_of_inline_caches_(entries.size()),
method_(method),
is_method_being_compiled_(false),
current_inline_uses_(0),
saved_entry_point_(nullptr) {
memset(&cache_, 0, number_of_inline_caches_ * sizeof(InlineCache));
for (size_t i = 0; i < number_of_inline_caches_; ++i) {
cache_[i].dex_pc_ = entries[i];
}
}
// Number of instructions we are profiling in the ArtMethod.
const uint32_t number_of_inline_caches_;
// Method this profiling info is for.
ArtMethod* const method_;
// Whether the ArtMethod is currently being compiled. This flag
// is implicitly guarded by the JIT code cache lock.
// TODO: Make the JIT code cache lock global.
bool is_method_being_compiled_;
// When the compiler inlines the method associated to this ProfilingInfo,
// it updates this counter so that the GC does not try to clear the inline caches.
uint16_t current_inline_uses_;
// Entry point of the corresponding ArtMethod, while the JIT code cache
// is poking for the liveness of compiled code.
const void* saved_entry_point_;
// Dynamically allocated array of size `number_of_inline_caches_`.
InlineCache cache_[0];
friend class jit::JitCodeCache;
DISALLOW_COPY_AND_ASSIGN(ProfilingInfo);
};
} // namespace art
#endif // ART_RUNTIME_JIT_PROFILING_INFO_H_
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