Lazy deopt without code patching.

runtime/vm/stack_frame.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_STACK_FRAME_H_
 #define VM_STACK_FRAME_H_
 
 #include "vm/allocation.h"
 #include "vm/object.h"
 #include "vm/stub_code.h"
@@ skipping 35 matching lines @@
   static int SavedCallerPpSlotFromFp() {
     if (kSavedCallerPpSlotFromFp != kSavedCallerFpSlotFromFp) {
       return kSavedCallerPpSlotFromFp;
     }
     UNREACHABLE();
     return 0;
   }
 
   void set_pc(uword value) {
     *reinterpret_cast<uword*>(sp() + (kSavedPcSlotFromSp * kWordSize)) = value;
+    pc_ = value;
   }
 
   void set_pc_marker(RawCode* code) {
     *reinterpret_cast<RawCode**>(fp() + (kPcMarkerSlotFromFp * kWordSize)) =
         code;
   }
 
   // Visit objects in the frame.
   virtual void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
@@ skipping 37 matching lines @@
   uword GetCallerSp() const {
     return fp() + (kCallerSpSlotFromFp * kWordSize);
   }
 
   uword GetCallerFp() const {
     return *(reinterpret_cast<uword*>(
       fp() + (kSavedCallerFpSlotFromFp * kWordSize)));
   }
 
   uword GetCallerPc() const {
-    return *(reinterpret_cast<uword*>(
+    uword raw_pc = *(reinterpret_cast<uword*>(
         fp() + (kSavedCallerPcSlotFromFp * kWordSize)));
+    ASSERT(raw_pc != StubCode::DeoptimizeLazyFromThrow_entry()->EntryPoint());
+    if (raw_pc == StubCode::DeoptimizeLazyFromReturn_entry()->EntryPoint()) {
+      uword fp = GetCallerFp();
+      MallocGrowableArray<PendingLazyDeopt>* pending_deopts =
+          isolate()->pending_deopts();
+      for (intptr_t i = 0; i < pending_deopts->length(); i++) {
+        if ((*pending_deopts)[i].fp() == fp) {
+          return (*pending_deopts)[i].pc();
+        }
+      }
+      UNREACHABLE();
+    }
+    return raw_pc;
   }
 
   uword fp_;
   uword sp_;
   uword pc_;
   Thread* thread_;
 
   // The iterators FrameSetIterator and StackFrameIterator set the private
   // fields fp_ and sp_ when they return the respective frame objects.
   friend class FrameSetIterator;
@@ skipping 247 matching lines @@
 
 
 DART_FORCE_INLINE static uword LocalVarAddress(uword fp, intptr_t index) {
   return fp + LocalVarIndex(0, index) * kWordSize;
 }
 
 
 }  // namespace dart
 
 #endif  // VM_STACK_FRAME_H_