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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 "entrypoints/entrypoint_utils-inl.h"
     18 #include "mirror/art_method.h"
     19 #include "mirror/object-inl.h"
     20 #include "verifier/dex_gc_map.h"
     21 #include "stack.h"
     22 
     23 namespace art {
     24 
     25 class ShadowFrameCopyVisitor : public StackVisitor {
     26  public:
     27   explicit ShadowFrameCopyVisitor(Thread* self) : StackVisitor(self, NULL), prev_frame_(NULL),
     28       top_frame_(NULL) {}
     29 
     30   bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     31     if (IsShadowFrame()) {
     32       ShadowFrame* cur_frame = GetCurrentShadowFrame();
     33       size_t num_regs = cur_frame->NumberOfVRegs();
     34       mirror::ArtMethod* method = cur_frame->GetMethod();
     35       uint32_t dex_pc = cur_frame->GetDexPC();
     36       ShadowFrame* new_frame = ShadowFrame::Create(num_regs, NULL, method, dex_pc);
     37 
     38       const uint8_t* gc_map = method->GetNativeGcMap(sizeof(void*));
     39       verifier::DexPcToReferenceMap dex_gc_map(gc_map);
     40       const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc);
     41       for (size_t reg = 0; reg < num_regs; ++reg) {
     42         if (TestBitmap(reg, reg_bitmap)) {
     43           new_frame->SetVRegReference(reg, cur_frame->GetVRegReference(reg));
     44         } else {
     45           new_frame->SetVReg(reg, cur_frame->GetVReg(reg));
     46         }
     47       }
     48 
     49       if (prev_frame_ != NULL) {
     50         prev_frame_->SetLink(new_frame);
     51       } else {
     52         top_frame_ = new_frame;
     53       }
     54       prev_frame_ = new_frame;
     55     }
     56     return true;
     57   }
     58 
     59   ShadowFrame* GetShadowFrameCopy() {
     60     return top_frame_;
     61   }
     62 
     63  private:
     64   static bool TestBitmap(int reg, const uint8_t* reg_vector) {
     65     return ((reg_vector[reg / 8] >> (reg % 8)) & 0x01) != 0;
     66   }
     67 
     68   ShadowFrame* prev_frame_;
     69   ShadowFrame* top_frame_;
     70 };
     71 
     72 extern "C" void art_portable_test_suspend_from_code(Thread* self)
     73     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     74   CheckSuspend(self);
     75   if (Runtime::Current()->GetInstrumentation()->ShouldPortableCodeDeoptimize()) {
     76     // Save out the shadow frame to the heap
     77     ShadowFrameCopyVisitor visitor(self);
     78     visitor.WalkStack(true);
     79     self->SetDeoptimizationShadowFrame(visitor.GetShadowFrameCopy());
     80     self->SetDeoptimizationReturnValue(JValue());
     81     self->SetException(ThrowLocation(), Thread::GetDeoptimizationException());
     82   }
     83 }
     84 
     85 extern "C" ShadowFrame* art_portable_push_shadow_frame_from_code(Thread* thread,
     86                                                                  ShadowFrame* new_shadow_frame,
     87                                                                  mirror::ArtMethod* method,
     88                                                                  uint32_t num_vregs) {
     89   ShadowFrame* old_frame = thread->PushShadowFrame(new_shadow_frame);
     90   new_shadow_frame->SetMethod(method);
     91   new_shadow_frame->SetNumberOfVRegs(num_vregs);
     92   return old_frame;
     93 }
     94 
     95 }  // namespace art
     96