| /* |
| * 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. |
| */ |
| |
| #include "inliner.h" |
| |
| #include "builder.h" |
| #include "class_linker.h" |
| #include "constant_folding.h" |
| #include "dead_code_elimination.h" |
| #include "driver/compiler_driver-inl.h" |
| #include "driver/dex_compilation_unit.h" |
| #include "instruction_simplifier.h" |
| #include "mirror/art_method-inl.h" |
| #include "mirror/class_loader.h" |
| #include "mirror/dex_cache.h" |
| #include "nodes.h" |
| #include "register_allocator.h" |
| #include "ssa_phi_elimination.h" |
| #include "scoped_thread_state_change.h" |
| #include "thread.h" |
| #include "dex/verified_method.h" |
| #include "dex/verification_results.h" |
| |
| namespace art { |
| |
| static constexpr int kMaxInlineCodeUnits = 100; |
| static constexpr int kDepthLimit = 5; |
| |
| void HInliner::Run() { |
| if (graph_->IsDebuggable()) { |
| // For simplicity, we currently never inline when the graph is debuggable. This avoids |
| // doing some logic in the runtime to discover if a method could have been inlined. |
| return; |
| } |
| const GrowableArray<HBasicBlock*>& blocks = graph_->GetReversePostOrder(); |
| for (size_t i = 0; i < blocks.Size(); ++i) { |
| HBasicBlock* block = blocks.Get(i); |
| for (HInstruction* instruction = block->GetFirstInstruction(); instruction != nullptr;) { |
| HInstruction* next = instruction->GetNext(); |
| HInvokeStaticOrDirect* call = instruction->AsInvokeStaticOrDirect(); |
| // As long as the call is not intrinsified, it is worth trying to inline. |
| if (call != nullptr && call->GetIntrinsic() == Intrinsics::kNone) { |
| // We use the original invoke type to ensure the resolution of the called method |
| // works properly. |
| if (!TryInline(call, call->GetDexMethodIndex(), call->GetOriginalInvokeType())) { |
| if (kIsDebugBuild) { |
| std::string callee_name = |
| PrettyMethod(call->GetDexMethodIndex(), *outer_compilation_unit_.GetDexFile()); |
| bool should_inline = callee_name.find("$inline$") != std::string::npos; |
| CHECK(!should_inline) << "Could not inline " << callee_name; |
| } |
| } |
| } |
| instruction = next; |
| } |
| } |
| } |
| |
| bool HInliner::TryInline(HInvoke* invoke_instruction, |
| uint32_t method_index, |
| InvokeType invoke_type) const { |
| ScopedObjectAccess soa(Thread::Current()); |
| const DexFile& caller_dex_file = *caller_compilation_unit_.GetDexFile(); |
| VLOG(compiler) << "Try inlining " << PrettyMethod(method_index, caller_dex_file); |
| |
| StackHandleScope<3> hs(soa.Self()); |
| Handle<mirror::DexCache> dex_cache( |
| hs.NewHandle(caller_compilation_unit_.GetClassLinker()->FindDexCache(caller_dex_file))); |
| Handle<mirror::ClassLoader> class_loader(hs.NewHandle( |
| soa.Decode<mirror::ClassLoader*>(caller_compilation_unit_.GetClassLoader()))); |
| Handle<mirror::ArtMethod> resolved_method(hs.NewHandle( |
| compiler_driver_->ResolveMethod( |
| soa, dex_cache, class_loader, &caller_compilation_unit_, method_index, invoke_type))); |
| |
| if (resolved_method.Get() == nullptr) { |
| VLOG(compiler) << "Method cannot be resolved " << PrettyMethod(method_index, caller_dex_file); |
| return false; |
| } |
| |
| bool can_use_dex_cache = true; |
| const DexFile& outer_dex_file = *outer_compilation_unit_.GetDexFile(); |
| if (resolved_method->GetDexFile()->GetLocation().compare(outer_dex_file.GetLocation()) != 0) { |
| can_use_dex_cache = false; |
| } |
| |
| const DexFile::CodeItem* code_item = resolved_method->GetCodeItem(); |
| |
| if (code_item == nullptr) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " is not inlined because it is native"; |
| return false; |
| } |
| |
| if (code_item->insns_size_in_code_units_ > kMaxInlineCodeUnits) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " is too big to inline"; |
| return false; |
| } |
| |
| if (code_item->tries_size_ != 0) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " is not inlined because of try block"; |
| return false; |
| } |
| |
| uint16_t class_def_idx = resolved_method->GetDeclaringClass()->GetDexClassDefIndex(); |
| if (!compiler_driver_->IsMethodVerifiedWithoutFailures( |
| resolved_method->GetDexMethodIndex(), class_def_idx, *resolved_method->GetDexFile())) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " couldn't be verified, so it cannot be inlined"; |
| return false; |
| } |
| |
| if (resolved_method->ShouldNotInline()) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " was already flagged as non inlineable"; |
| return false; |
| } |
| |
| if (invoke_instruction->IsInvokeStaticOrDirect() && |
| invoke_instruction->AsInvokeStaticOrDirect()->IsStaticWithImplicitClinitCheck()) { |
| // Case of a static method that cannot be inlined because it implicitly |
| // requires an initialization check of its declaring class. |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " is not inlined because it is static and requires a clinit" |
| << " check that cannot be emitted due to Dex cache limitations"; |
| return false; |
| } |
| |
| if (!TryBuildAndInline(resolved_method, invoke_instruction, method_index, can_use_dex_cache)) { |
| resolved_method->SetShouldNotInline(); |
| return false; |
| } |
| |
| VLOG(compiler) << "Successfully inlined " << PrettyMethod(method_index, caller_dex_file); |
| MaybeRecordStat(kInlinedInvoke); |
| return true; |
| } |
| |
| bool HInliner::TryBuildAndInline(Handle<mirror::ArtMethod> resolved_method, |
| HInvoke* invoke_instruction, |
| uint32_t method_index, |
| bool can_use_dex_cache) const { |
| ScopedObjectAccess soa(Thread::Current()); |
| const DexFile::CodeItem* code_item = resolved_method->GetCodeItem(); |
| const DexFile& caller_dex_file = *caller_compilation_unit_.GetDexFile(); |
| |
| DexCompilationUnit dex_compilation_unit( |
| nullptr, |
| caller_compilation_unit_.GetClassLoader(), |
| caller_compilation_unit_.GetClassLinker(), |
| *resolved_method->GetDexFile(), |
| code_item, |
| resolved_method->GetDeclaringClass()->GetDexClassDefIndex(), |
| resolved_method->GetDexMethodIndex(), |
| resolved_method->GetAccessFlags(), |
| nullptr); |
| |
| HGraph* callee_graph = new (graph_->GetArena()) HGraph( |
| graph_->GetArena(), graph_->IsDebuggable(), graph_->GetCurrentInstructionId()); |
| |
| OptimizingCompilerStats inline_stats; |
| HGraphBuilder builder(callee_graph, |
| &dex_compilation_unit, |
| &outer_compilation_unit_, |
| resolved_method->GetDexFile(), |
| compiler_driver_, |
| &inline_stats); |
| |
| if (!builder.BuildGraph(*code_item)) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " could not be built, so cannot be inlined"; |
| return false; |
| } |
| |
| if (!RegisterAllocator::CanAllocateRegistersFor(*callee_graph, |
| compiler_driver_->GetInstructionSet())) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " cannot be inlined because of the register allocator"; |
| return false; |
| } |
| |
| if (!callee_graph->TryBuildingSsa()) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " could not be transformed to SSA"; |
| return false; |
| } |
| |
| // Run simple optimizations on the graph. |
| HDeadCodeElimination dce(callee_graph, stats_); |
| HConstantFolding fold(callee_graph); |
| InstructionSimplifier simplify(callee_graph, stats_); |
| |
| HOptimization* optimizations[] = { |
| &dce, |
| &fold, |
| &simplify, |
| }; |
| |
| for (size_t i = 0; i < arraysize(optimizations); ++i) { |
| HOptimization* optimization = optimizations[i]; |
| optimization->Run(); |
| } |
| |
| if (depth_ + 1 < kDepthLimit) { |
| HInliner inliner(callee_graph, |
| outer_compilation_unit_, |
| dex_compilation_unit, |
| compiler_driver_, |
| stats_, |
| depth_ + 1); |
| inliner.Run(); |
| } |
| |
| HReversePostOrderIterator it(*callee_graph); |
| it.Advance(); // Past the entry block, it does not contain instructions that prevent inlining. |
| for (; !it.Done(); it.Advance()) { |
| HBasicBlock* block = it.Current(); |
| if (block->IsLoopHeader()) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " could not be inlined because it contains a loop"; |
| return false; |
| } |
| |
| for (HInstructionIterator instr_it(block->GetInstructions()); |
| !instr_it.Done(); |
| instr_it.Advance()) { |
| HInstruction* current = instr_it.Current(); |
| if (current->IsSuspendCheck()) { |
| continue; |
| } |
| |
| if (current->CanThrow()) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " could not be inlined because " << current->DebugName() |
| << " can throw"; |
| return false; |
| } |
| |
| if (current->NeedsEnvironment()) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " could not be inlined because " << current->DebugName() |
| << " needs an environment"; |
| return false; |
| } |
| |
| if (!can_use_dex_cache && current->NeedsDexCache()) { |
| VLOG(compiler) << "Method " << PrettyMethod(method_index, caller_dex_file) |
| << " could not be inlined because " << current->DebugName() |
| << " it is in a different dex file and requires access to the dex cache"; |
| return false; |
| } |
| } |
| } |
| |
| callee_graph->InlineInto(graph_, invoke_instruction); |
| |
| if (callee_graph->HasArrayAccesses()) { |
| graph_->SetHasArrayAccesses(true); |
| } |
| |
| return true; |
| } |
| |
| } // namespace art |
