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"
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 "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 {
44 ScopedTrace trace(std::string("Deoptimization ") + GetDeoptimizationKindName(kind));
45 if (single_frame) {
46 exception_handler.DeoptimizeSingleFrame(kind);
47 } else {
48 exception_handler.DeoptimizeStack();
49 }
50 }
51 uintptr_t return_pc = exception_handler.UpdateInstrumentationStack();
52 if (exception_handler.IsFullFragmentDone()) {
53 exception_handler.DoLongJump(true);
54 } else {
55 exception_handler.DeoptimizePartialFragmentFixup(return_pc);
56 // We cannot smash the caller-saves, as we need the ArtMethod in a parameter register that would
57 // be caller-saved. This has the downside that we cannot track incorrect register usage down the
58 // line.
59 exception_handler.DoLongJump(false);
60 }
61 }
62
artDeoptimize(Thread * self)63 extern "C" NO_RETURN void artDeoptimize(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_) {
64 ScopedQuickEntrypointChecks sqec(self);
65 artDeoptimizeImpl(self, DeoptimizationKind::kFullFrame, false);
66 }
67
68 // This is called directly from compiled code by an HDeoptimize.
artDeoptimizeFromCompiledCode(DeoptimizationKind kind,Thread * self)69 extern "C" NO_RETURN void artDeoptimizeFromCompiledCode(DeoptimizationKind kind, Thread* self)
70 REQUIRES_SHARED(Locks::mutator_lock_) {
71 ScopedQuickEntrypointChecks sqec(self);
72 // Before deoptimizing to interpreter, we must push the deoptimization context.
73 JValue return_value;
74 return_value.SetJ(0); // we never deoptimize from compiled code with an invoke result.
75 self->PushDeoptimizationContext(return_value, false, /* from_code */ true, self->GetException());
76 artDeoptimizeImpl(self, kind, true);
77 }
78
79 } // namespace art
80