Initial implementation of on-stack replacement (OSR).

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 2517 matching lines @@
   enum Kind {
     kDeopt,            // Deoptimization continuation point.
     kEntryPatch,       // Location where to patch entry.
     kPatchCode,        // Buffer for patching code entry.
     kLazyDeoptJump,    // Lazy deoptimization trampoline.
     kIcCall,           // IC call.
     kFuncCall,         // Call to known target, e.g. static call.
     kClosureCall,      // Closure call.
     kRuntimeCall,      // Runtime call.
     kReturn,           // Return from function.
+    kOsrEntry,         // OSR entry point in unoptimized code.
     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 315 matching lines @@
     return raw_ptr()->static_calls_target_table_;
   }
 
   RawDeoptInfo* GetDeoptInfoAtPc(uword pc, intptr_t* deopt_reason) const;
 
   // Returns null if there is no static call at 'pc'.
   RawFunction* GetStaticCallTargetFunctionAt(uword pc) const;
   // Aborts if there is no static call at 'pc'.
   void SetStaticCallTargetCodeAt(uword pc, const Code& code) const;
 
+  void Disassemble() const;
+
   class Comments : public ZoneAllocated {
    public:
     static Comments& New(intptr_t count);
 
     intptr_t Length() const;
 
     void SetPCOffsetAt(intptr_t idx, intptr_t pc_offset);
     void SetCommentAt(intptr_t idx, const String& comment);
 
     intptr_t PCOffsetAt(intptr_t idx) const;
@@ skipping 67 matching lines @@
   int32_t GetPointerOffsetAt(int index) const {
     return *PointerOffsetAddrAt(index);
   }
   intptr_t GetTokenIndexOfPC(uword pc) const;
 
   // Find pc, return 0 if not found.
   uword GetPatchCodePc() const;
   uword GetLazyDeoptPc() const;
 
   uword GetPcForDeoptId(intptr_t deopt_id, PcDescriptors::Kind kind) const;
+  intptr_t GetDeoptIdForOsr(uword pc) 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 2897 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_