Patchable AllocateArray stub, like instance allocation stubs.

runtime/vm/stub_code.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_STUB_CODE_H_
 #define VM_STUB_CODE_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 
@@ skipping 10 matching lines @@
 // isolates running in this dart process.
 #define VM_STUB_CODE_LIST(V)                                                   \
   V(PrintStopMessage)                                                          \
   V(CallToRuntime)                                                             \
   V(LazyCompile)                                                               \
   V(CallBootstrapCFunction)                                                    \
   V(CallNativeCFunction)                                                       \
   V(CallStaticFunction)                                                        \
   V(FixCallersTarget)                                                          \
   V(FixAllocationStubTarget)                                                   \
+  V(FixAllocateArrayStubTarget)                                                \
   V(Deoptimize)                                                                \
   V(DeoptimizeLazy)                                                            \
   V(ICCallBreakpoint)                                                          \
   V(ClosureCallBreakpoint)                                                     \
   V(RuntimeCallBreakpoint)                                                     \
   V(DebugStepCheck)                                                            \
   V(Subtype1TestCache)                                                         \
   V(Subtype2TestCache)                                                         \
   V(Subtype3TestCache)                                                         \
   V(GetStackPointer)                                                           \
   V(JumpToExceptionHandler)                                                    \
   V(UnoptimizedIdenticalWithNumberCheck)                                       \
   V(OptimizedIdenticalWithNumberCheck)                                         \
 
 // Is it permitted for the stubs above to refer to Object::null(), which is
 // allocated in the VM isolate and shared across all isolates.
 // However, in cases where a simple GC-safe placeholder is needed on the stack,
 // using Smi 0 instead of Object::null() is slightly more efficient, since a Smi
 // does not require relocation.
 
 // List of stubs created per isolate, these stubs could potentially contain
 // embedded objects and hence cannot be shared across isolates.
 #define STUB_CODE_LIST(V)                                                      \
-  V(AllocateArray)                                                             \
   V(CallClosureNoSuchMethod)                                                   \
   V(AllocateContext)                                                           \
   V(UpdateStoreBuffer)                                                         \
   V(OneArgCheckInlineCache)                                                    \
   V(TwoArgsCheckInlineCache)                                                   \
   V(ThreeArgsCheckInlineCache)                                                 \
   V(SmiAddInlineCache)                                                         \
   V(SmiSubInlineCache)                                                         \
   V(SmiEqualInlineCache)                                                       \
   V(OneArgOptimizedCheckInlineCache)                                           \
@@ skipping 26 matching lines @@
   intptr_t size_;
   ExternalLabel label_;
 
   DISALLOW_COPY_AND_ASSIGN(StubEntry);
 };
 
 
 // class StubCode is used to maintain the lifecycle of stubs.
 class StubCode {
  public:
-  StubCode()
+  explicit StubCode(Isolate* isolate)
     :
 #define STUB_CODE_INITIALIZER(name)                                            \
         name##_entry_(NULL),
   STUB_CODE_LIST(STUB_CODE_INITIALIZER)
-        dummy_(NULL) {}
+        isolate_(isolate) {}
   ~StubCode();
 
   void GenerateFor(Isolate* isolate);
 
   // Generate all stubs which are shared across all isolates, this is done
   // only once and the stub code resides in the vm_isolate heap.
   static void InitOnce();
 
   // Generate all stubs which are generated on a per isolate basis as they
   // have embedded objects which are isolate specific.
@@ skipping 41 matching lines @@
   uword name##EntryPoint() {                                                   \
     return name##_entry()->EntryPoint();                                       \
   }                                                                            \
   intptr_t name##Size() {                                                      \
     return name##_entry()->Size();                                             \
   }
   STUB_CODE_LIST(STUB_CODE_ACCESSOR);
 #undef STUB_CODE_ACCESSOR
 
   static RawCode* GetAllocationStubForClass(const Class& cls);
+  RawCode* GetAllocateArrayStub();
 
   uword UnoptimizedStaticCallEntryPoint(intptr_t num_args_tested);
 
   static const intptr_t kNoInstantiator = 0;
 
  private:
   friend class MegamorphicCacheTable;
 
   static const intptr_t kStubCodeSize = 4 * KB;
 
 #define STUB_CODE_GENERATE(name)                                               \
   static void Generate##name##Stub(Assembler* assembler);
   VM_STUB_CODE_LIST(STUB_CODE_GENERATE);
   STUB_CODE_LIST(STUB_CODE_GENERATE);
 #undef STUB_CODE_GENERATE
 
 #define STUB_CODE_ENTRY(name)                                                  \
   static StubEntry* name##_entry_;
   VM_STUB_CODE_LIST(STUB_CODE_ENTRY);
 #undef STUB_CODE_ENTRY
 
 #define STUB_CODE_ENTRY(name)                                                  \
   StubEntry* name##_entry_;
   STUB_CODE_LIST(STUB_CODE_ENTRY);
 #undef STUB_CODE_ENTRY
-  // This dummy field is needed so that we can initialize
-  // the stubs from a macro.
-  void* dummy_;
+  Isolate* isolate_;
 
   // Generate the stub and finalize the generated code into the stub
   // code executable area.
   static RawCode* Generate(const char* name,
                            void (*GenerateStub)(Assembler* assembler));
 
   static void GenerateMegamorphicMissStub(Assembler* assembler);
   static void GenerateAllocationStubForClass(
       Assembler* assembler, const Class& cls,
       uword* entry_patch_offset, uword* patch_code_pc_offset);
+  static void GeneratePatchableAllocateArrayStub(Assembler* assembler,
+      uword* entry_patch_offset, uword* patch_code_pc_offset);
   static void GenerateNArgsCheckInlineCacheStub(
       Assembler* assembler,
       intptr_t num_args,
       const RuntimeEntry& handle_ic_miss,
       Token::Kind kind);
   static void GenerateUsageCounterIncrement(Assembler* assembler,
                                             Register temp_reg);
   static void GenerateOptimizedUsageCounterIncrement(Assembler* assembler);
 
   static void GenerateIdenticalWithNumberCheckStub(
       Assembler* assembler,
       const Register left,
       const Register right,
       const Register temp1 = kNoRegister,
       const Register temp2 = kNoRegister);
 };
 
 }  // namespace dart
 
 #endif  // VM_STUB_CODE_H_