Deoptimization can occur at Dart calls (includes native calls to C) but not at runtime calls. This …

runtime/vm/object.h

 // Copyright (c) 2012, 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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2243 matching lines @@
     kDeoptReasonEntry = 3,  // DeoptReasonId.
     kTryIndexEntry = 4,     // Try block index.
     kDeoptIndexEntry = 4,   // Deoptimization array index.
     // We would potentially be adding other objects here like
     // pointer maps for optimized functions, local variables information  etc.
     kNumberOfEntries = 5,
   };
 
  public:
   enum Kind {
-    kDeopt = 0,   // Deoptimization continuation point.
-    kDeoptIndex,  // Index into deopt info array.
-    kPatchCode,   // Buffer for patching code entry.
-    kIcCall,      // IC call.
-    kFuncCall,    // Call to known target, e.g. static call, closure call.
-    kReturn,      // Return from function.
+    kDeoptBefore = 0,  // Deoptimization continuation point before instruction.
+    kDeoptAfter,       // Deoptimization continuation point after instruction.
+    kDeoptIndex,       // Index into deopt info array.
+    kPatchCode,        // Buffer for patching code entry.
+    kIcCall,           // IC call.
+    kFuncCall,         // Call to known target, e.g. static call, closure call.
+    kReturn,           // Return from function.
     kOther
   };
 
   intptr_t Length() const;
 
   uword PC(intptr_t index) const;
   PcDescriptors::Kind DescriptorKind(intptr_t index) const;
   const char* KindAsStr(intptr_t index) const;
   intptr_t DeoptId(intptr_t index) const;
   intptr_t TokenPos(intptr_t index) const;
@@ skipping 347 matching lines @@
   static RawCode* LookupCode(uword pc);
 
   int32_t GetPointerOffsetAt(int index) const {
     return *PointerOffsetAddrAt(index);
   }
   intptr_t GetTokenIndexOfPC(uword pc) const;
 
   // Find pc of patch code buffer. Return 0 if not found.
   uword GetPatchCodePc() const;
 
-  uword GetDeoptPcAtDeoptId(intptr_t deopt_id) const;
+  uword GetDeoptBeforePcAtDeoptId(intptr_t deopt_id) const;
+  uword GetDeoptAfterPcAtDeoptId(intptr_t deopt_id) const;
 
   // Returns true if there is an object in the code between 'start_offset'
   // (inclusive) and 'end_offset' (exclusive).
   bool ObjectExistsInArea(intptr_t start_offest, intptr_t end_offset) const;
 
   // Each (*node_ids)[n] has a an extracted ic data array (*arrays)[n].
   // Returns the maximum id found.
   intptr_t ExtractIcDataArraysAtCalls(
       GrowableArray<intptr_t>* node_ids,
       const GrowableObjectArray& ic_data_objs) const;
@@ skipping 27 matching lines @@
   int32_t* PointerOffsetAddrAt(int index) const {
     ASSERT(index >= 0);
     ASSERT(index < pointer_offsets_length());
     // TODO(iposva): Unit test is missing for this functionality.
     return &raw_ptr()->data_[index];
   }
   void SetPointerOffsetAt(int index, int32_t offset_in_instructions) {
     *PointerOffsetAddrAt(index) = offset_in_instructions;
   }
 
+  uword GetPcForDeoptId(intptr_t deopt_id, PcDescriptors::Kind kind) const;
+
   // New is a private method as RawInstruction and RawCode objects should
   // only be created using the Code::FinalizeCode method. This method creates
   // the RawInstruction and RawCode objects, sets up the pointer offsets
   // and links the two in a GC safe manner.
   static RawCode* New(intptr_t pointer_offsets_length);
 
   HEAP_OBJECT_IMPLEMENTATION(Code, Object);
   friend class Class;
 };
 
@@ skipping 2843 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_