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      1 /*
      2  * Copyright (C) 2012 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 "base/logging.h"  // For VLOG_IS_ON.
     18 #include "base/mutex.h"
     19 #include "base/systrace.h"
     20 #include "callee_save_frame.h"
     21 #include "interpreter/interpreter.h"
     22 #include "obj_ptr-inl.h"  // TODO: Find the other include that isn't complete, and clean this up.
     23 #include "quick_exception_handler.h"
     24 #include "runtime.h"
     25 #include "thread.h"
     26 
     27 namespace art {
     28 
     29 NO_RETURN static void artDeoptimizeImpl(Thread* self, DeoptimizationKind kind, bool single_frame)
     30     REQUIRES_SHARED(Locks::mutator_lock_) {
     31   Runtime::Current()->IncrementDeoptimizationCount(kind);
     32   if (VLOG_IS_ON(deopt)) {
     33     if (single_frame) {
     34       // Deopt logging will be in DeoptimizeSingleFrame. It is there to take advantage of the
     35       // specialized visitor that will show whether a method is Quick or Shadow.
     36     } else {
     37       LOG(INFO) << "Deopting:";
     38       self->Dump(LOG_STREAM(INFO));
     39     }
     40   }
     41 
     42   self->AssertHasDeoptimizationContext();
     43   QuickExceptionHandler exception_handler(self, true);
     44   {
     45     ScopedTrace trace(std::string("Deoptimization ") + GetDeoptimizationKindName(kind));
     46     if (single_frame) {
     47       exception_handler.DeoptimizeSingleFrame(kind);
     48     } else {
     49       exception_handler.DeoptimizeStack();
     50     }
     51   }
     52   uintptr_t return_pc = exception_handler.UpdateInstrumentationStack();
     53   if (exception_handler.IsFullFragmentDone()) {
     54     exception_handler.DoLongJump(true);
     55   } else {
     56     exception_handler.DeoptimizePartialFragmentFixup(return_pc);
     57     // We cannot smash the caller-saves, as we need the ArtMethod in a parameter register that would
     58     // be caller-saved. This has the downside that we cannot track incorrect register usage down the
     59     // line.
     60     exception_handler.DoLongJump(false);
     61   }
     62 }
     63 
     64 extern "C" NO_RETURN void artDeoptimize(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_) {
     65   ScopedQuickEntrypointChecks sqec(self);
     66   artDeoptimizeImpl(self, DeoptimizationKind::kFullFrame, false);
     67 }
     68 
     69 // This is called directly from compiled code by an HDeoptimize.
     70 extern "C" NO_RETURN void artDeoptimizeFromCompiledCode(DeoptimizationKind kind, Thread* self)
     71     REQUIRES_SHARED(Locks::mutator_lock_) {
     72   ScopedQuickEntrypointChecks sqec(self);
     73   // Before deoptimizing to interpreter, we must push the deoptimization context.
     74   JValue return_value;
     75   return_value.SetJ(0);  // we never deoptimize from compiled code with an invoke result.
     76   self->PushDeoptimizationContext(return_value,
     77                                   false /* is_reference */,
     78                                   self->GetException(),
     79                                   true /* from_code */,
     80                                   DeoptimizationMethodType::kDefault);
     81   artDeoptimizeImpl(self, kind, true);
     82 }
     83 
     84 }  // namespace art
     85