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