Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "profiling_info.h" |
| 18 | |
| 19 | #include "art_method-inl.h" |
| 20 | #include "dex_instruction.h" |
| 21 | #include "jit/jit.h" |
| 22 | #include "jit/jit_code_cache.h" |
| 23 | #include "scoped_thread_state_change.h" |
| 24 | #include "thread.h" |
| 25 | |
| 26 | namespace art { |
| 27 | |
Nicolas Geoffray | 26705e2 | 2015-10-28 12:50:11 +0000 | [diff] [blame] | 28 | bool ProfilingInfo::Create(Thread* self, ArtMethod* method, bool retry_allocation) { |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 29 | // Walk over the dex instructions of the method and keep track of |
| 30 | // instructions we are interested in profiling. |
Nicolas Geoffray | 1dad3f6 | 2015-10-23 14:59:54 +0100 | [diff] [blame] | 31 | DCHECK(!method->IsNative()); |
| 32 | const DexFile::CodeItem& code_item = *method->GetCodeItem(); |
| 33 | const uint16_t* code_ptr = code_item.insns_; |
| 34 | const uint16_t* code_end = code_item.insns_ + code_item.insns_size_in_code_units_; |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 35 | |
| 36 | uint32_t dex_pc = 0; |
| 37 | std::vector<uint32_t> entries; |
| 38 | while (code_ptr < code_end) { |
| 39 | const Instruction& instruction = *Instruction::At(code_ptr); |
| 40 | switch (instruction.Opcode()) { |
| 41 | case Instruction::INVOKE_VIRTUAL: |
| 42 | case Instruction::INVOKE_VIRTUAL_RANGE: |
| 43 | case Instruction::INVOKE_VIRTUAL_QUICK: |
| 44 | case Instruction::INVOKE_VIRTUAL_RANGE_QUICK: |
| 45 | case Instruction::INVOKE_INTERFACE: |
| 46 | case Instruction::INVOKE_INTERFACE_RANGE: |
| 47 | entries.push_back(dex_pc); |
| 48 | break; |
| 49 | |
| 50 | default: |
| 51 | break; |
| 52 | } |
| 53 | dex_pc += instruction.SizeInCodeUnits(); |
| 54 | code_ptr += instruction.SizeInCodeUnits(); |
| 55 | } |
| 56 | |
Nicolas Geoffray | 73be1e8 | 2015-09-17 15:22:56 +0100 | [diff] [blame] | 57 | // We always create a `ProfilingInfo` object, even if there is no instruction we are |
| 58 | // interested in. The JIT code cache internally uses it. |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 59 | |
| 60 | // Allocate the `ProfilingInfo` object int the JIT's data space. |
| 61 | jit::JitCodeCache* code_cache = Runtime::Current()->GetJit()->GetCodeCache(); |
Nicolas Geoffray | 26705e2 | 2015-10-28 12:50:11 +0000 | [diff] [blame] | 62 | return code_cache->AddProfilingInfo(self, method, entries, retry_allocation) != nullptr; |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 63 | } |
| 64 | |
Nicolas Geoffray | 73be1e8 | 2015-09-17 15:22:56 +0100 | [diff] [blame] | 65 | InlineCache* ProfilingInfo::GetInlineCache(uint32_t dex_pc) { |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 66 | InlineCache* cache = nullptr; |
| 67 | // TODO: binary search if array is too long. |
| 68 | for (size_t i = 0; i < number_of_inline_caches_; ++i) { |
Nicolas Geoffray | 73be1e8 | 2015-09-17 15:22:56 +0100 | [diff] [blame] | 69 | if (cache_[i].dex_pc_ == dex_pc) { |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 70 | cache = &cache_[i]; |
| 71 | break; |
| 72 | } |
| 73 | } |
Nicolas Geoffray | 73be1e8 | 2015-09-17 15:22:56 +0100 | [diff] [blame] | 74 | return cache; |
| 75 | } |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 76 | |
Nicolas Geoffray | 73be1e8 | 2015-09-17 15:22:56 +0100 | [diff] [blame] | 77 | void ProfilingInfo::AddInvokeInfo(uint32_t dex_pc, mirror::Class* cls) { |
| 78 | InlineCache* cache = GetInlineCache(dex_pc); |
Nicolas Geoffray | 4aaa1d3 | 2015-12-17 11:56:01 +0000 | [diff] [blame] | 79 | CHECK(cache != nullptr) << PrettyMethod(method_) << "@" << dex_pc; |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 80 | for (size_t i = 0; i < InlineCache::kIndividualCacheSize; ++i) { |
Nicolas Geoffray | 1dad3f6 | 2015-10-23 14:59:54 +0100 | [diff] [blame] | 81 | mirror::Class* existing = cache->classes_[i].Read(); |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 82 | if (existing == cls) { |
| 83 | // Receiver type is already in the cache, nothing else to do. |
| 84 | return; |
| 85 | } else if (existing == nullptr) { |
| 86 | // Cache entry is empty, try to put `cls` in it. |
| 87 | GcRoot<mirror::Class> expected_root(nullptr); |
| 88 | GcRoot<mirror::Class> desired_root(cls); |
| 89 | if (!reinterpret_cast<Atomic<GcRoot<mirror::Class>>*>(&cache->classes_[i])-> |
| 90 | CompareExchangeStrongSequentiallyConsistent(expected_root, desired_root)) { |
| 91 | // Some other thread put a class in the cache, continue iteration starting at this |
| 92 | // entry in case the entry contains `cls`. |
| 93 | --i; |
| 94 | } else { |
| 95 | // We successfully set `cls`, just return. |
| 96 | return; |
| 97 | } |
| 98 | } |
| 99 | } |
Nicolas Geoffray | b6e20ae | 2016-03-07 14:29:04 +0000 | [diff] [blame] | 100 | // Unsuccessfull - cache is full, making it megamorphic. We do not DCHECK it though, |
| 101 | // as the garbage collector might clear the entries concurrently. |
Nicolas Geoffray | 5550ca8 | 2015-08-21 18:38:30 +0100 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | } // namespace art |