Create AllocationSite objects, pointed to by AllocationSiteInfo.

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 43 matching lines @@
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   static Register registers[] = { rax, rbx, rcx, rdx };
   descriptor->register_param_count_ = 4;
   descriptor->register_params_ = registers;
   descriptor->deoptimization_handler_ =
       Runtime::FunctionForId(Runtime::kCreateObjectLiteralShallow)->entry;
 }
 
 
+void CreateAllocationSiteStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { rbx };
+  descriptor->register_param_count_ = 1;
+  descriptor->register_params_ = registers;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
 void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   static Register registers[] = { rdx, rax };
   descriptor->register_param_count_ = 2;
   descriptor->register_params_ = registers;
   descriptor->deoptimization_handler_ =
       FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
 }
 
@@ skipping 3424 matching lines @@
   // Load the cache state into rcx.
   __ movq(rcx, FieldOperand(rbx, Cell::kValueOffset));
 
   // A monomorphic cache hit or an already megamorphic state: invoke the
   // function without changing the state.
   __ cmpq(rcx, rdi);
   __ j(equal, &done);
   __ Cmp(rcx, TypeFeedbackCells::MegamorphicSentinel(isolate));
   __ j(equal, &done);
 
-  // Special handling of the Array() function, which caches not only the
-  // monomorphic Array function but the initial ElementsKind with special
-  // sentinels
-  __ JumpIfNotSmi(rcx, &miss);
-  if (FLAG_debug_code) {
-    Handle<Object> terminal_kind_sentinel =
-        TypeFeedbackCells::MonomorphicArraySentinel(masm->isolate(),
-                                                    LAST_FAST_ELEMENTS_KIND);
-    __ Cmp(rcx, terminal_kind_sentinel);
-    __ Assert(less_equal, "Array function sentinel is not an ElementsKind");
-  }
+  // If we came here, we need to see if we are the array function.
+  // If we didn't have a matching function, and we didn't find the megamorph
+  // sentinel, then we have in the cell either some other function or an
+  // AllocationSite. Do a map check on the object in rcx.
+  Handle<Map> allocation_site_map(
+      masm->isolate()->heap()->allocation_site_map(),
+      masm->isolate());
+  __ Cmp(FieldOperand(rcx, 0), allocation_site_map);
+  __ j(not_equal, &miss);
 
   // Make sure the function is the Array() function
   __ LoadArrayFunction(rcx);
   __ cmpq(rdi, rcx);
   __ j(not_equal, &megamorphic);
   __ jmp(&done);
 
   __ bind(&miss);
 
   // A monomorphic miss (i.e, here the cache is not uninitialized) goes
   // megamorphic.
   __ Cmp(rcx, TypeFeedbackCells::UninitializedSentinel(isolate));
   __ j(equal, &initialize);
   // MegamorphicSentinel is an immortal immovable object (undefined) so no
   // write-barrier is needed.
   __ bind(&megamorphic);
   __ Move(FieldOperand(rbx, Cell::kValueOffset),
           TypeFeedbackCells::MegamorphicSentinel(isolate));
-  __ jmp(&done, Label::kNear);
+  __ jmp(&done);
 
   // An uninitialized cache is patched with the function or sentinel to
   // indicate the ElementsKind if function is the Array constructor.
   __ bind(&initialize);
   // Make sure the function is the Array() function
   __ LoadArrayFunction(rcx);
   __ cmpq(rdi, rcx);
   __ j(not_equal, &not_array_function);
 
-  // The target function is the Array constructor, install a sentinel value in
-  // the constructor's type info cell that will track the initial ElementsKind
-  // that should be used for the array when its constructed.
-  Handle<Object> initial_kind_sentinel =
-      TypeFeedbackCells::MonomorphicArraySentinel(isolate,
-          GetInitialFastElementsKind());
-  __ Move(FieldOperand(rbx, Cell::kValueOffset),
-          initial_kind_sentinel);
+  // The target function is the Array constructor,
+  // Create an AllocationSite if we don't already have it, store it in the cell
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+
+    __ push(rax);
+    __ push(rdi);
+    __ push(rbx);
+
+    CreateAllocationSiteStub create_stub;
+    __ CallStub(&create_stub);
+
+    __ pop(rbx);
+    __ pop(rdi);
+    __ pop(rax);
+  }
   __ jmp(&done);
 
   __ bind(&not_array_function);
   __ movq(FieldOperand(rbx, Cell::kValueOffset), rdi);
   // No need for a write barrier here - cells are rescanned.
 
   __ bind(&done);
 }
 
 
@@ skipping 149 matching lines @@
 }
 
 
 void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
   CEntryStub::GenerateAheadOfTime(isolate);
   StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(isolate);
   StubFailureTrampolineStub::GenerateAheadOfTime(isolate);
   // It is important that the store buffer overflow stubs are generated first.
   RecordWriteStub::GenerateFixedRegStubsAheadOfTime(isolate);
   ArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
+  CreateAllocationSiteStub::GenerateAheadOfTime(isolate);
 }
 
 
 void CodeStub::GenerateFPStubs(Isolate* isolate) {
 }
 
 
 void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
   CEntryStub stub(1, kDontSaveFPRegs);
   stub.GetCode(isolate)->set_is_pregenerated(true);
@@ skipping 2795 matching lines @@
   __ testb(rdx, Immediate(1));
   Label normal_sequence;
   __ j(not_zero, &normal_sequence);
 
   // look at the first argument
   __ movq(rcx, Operand(rsp, kPointerSize));
   __ testq(rcx, rcx);
   __ j(zero, &normal_sequence);
 
   // We are going to create a holey array, but our kind is non-holey.
-  // Fix kind and retry
+  // Fix kind and retry (only if we have an allocation site in the cell).
   __ incl(rdx);
   __ Cmp(rbx, undefined_sentinel);
   __ j(equal, &normal_sequence);
-
-  // The type cell may have gone megamorphic, don't overwrite if so
-  __ movq(rcx, FieldOperand(rbx, kPointerSize));
-  __ JumpIfNotSmi(rcx, &normal_sequence);
+  __ movq(rcx, FieldOperand(rbx, Cell::kValueOffset));
+  Handle<Map> allocation_site_map(
+      masm->isolate()->heap()->allocation_site_map(),
+      masm->isolate());
+  __ Cmp(FieldOperand(rcx, 0), allocation_site_map);
+  __ j(not_equal, &normal_sequence);
 
   // Save the resulting elements kind in type info
   __ Integer32ToSmi(rdx, rdx);
-  __ movq(FieldOperand(rbx, kPointerSize), rdx);
+  __ movq(FieldOperand(rcx, AllocationSite::kPayloadOffset), rdx);
   __ SmiToInteger32(rdx, rdx);
 
   __ bind(&normal_sequence);
   int last_index = GetSequenceIndexFromFastElementsKind(
       TERMINAL_FAST_ELEMENTS_KIND);
   for (int i = 0; i <= last_index; ++i) {
     Label next;
     ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
     __ cmpl(rdx, Immediate(kind));
     __ j(not_equal, &next);
     ArraySingleArgumentConstructorStub stub(kind);
     __ TailCallStub(&stub);
     __ bind(&next);
   }
 
   // If we reached this point there is a problem.
   __ Abort("Unexpected ElementsKind in array constructor");
 }
 
 
 template<class T>
 static void ArrayConstructorStubAheadOfTimeHelper(Isolate* isolate) {
   int to_index = GetSequenceIndexFromFastElementsKind(
       TERMINAL_FAST_ELEMENTS_KIND);
   for (int i = 0; i <= to_index; ++i) {
     ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
     T stub(kind);
     stub.GetCode(isolate)->set_is_pregenerated(true);
-    if (AllocationSiteInfo::GetMode(kind) != DONT_TRACK_ALLOCATION_SITE) {
+    if (AllocationSite::GetMode(kind) != DONT_TRACK_ALLOCATION_SITE) {
       T stub1(kind, CONTEXT_CHECK_REQUIRED, DISABLE_ALLOCATION_SITES);
       stub1.GetCode(isolate)->set_is_pregenerated(true);
     }
   }
 }
 
 
 void ArrayConstructorStubBase::GenerateStubsAheadOfTime(Isolate* isolate) {
   ArrayConstructorStubAheadOfTimeHelper<ArrayNoArgumentConstructorStub>(
       isolate);
@@ skipping 52 matching lines @@
     __ Cmp(FieldOperand(rbx, 0), cell_map);
     __ Assert(equal, "Expected property cell in register rbx");
     __ bind(&okay_here);
   }
 
   Label no_info, switch_ready;
   // Get the elements kind and case on that.
   __ Cmp(rbx, undefined_sentinel);
   __ j(equal, &no_info);
   __ movq(rdx, FieldOperand(rbx, Cell::kValueOffset));
-  __ JumpIfNotSmi(rdx, &no_info);
+
+  // The type cell may have undefined in its value.
+  __ Cmp(rdx, undefined_sentinel);
+  __ j(equal, &no_info);
+
+  // We should have an allocation site object
+  if (FLAG_debug_code) {
+    __ Cmp(FieldOperand(rdx, 0),
+           Handle<Map>(masm->isolate()->heap()->allocation_site_map()));
+    __ Assert(equal, "Expected AllocationSite object in register rdx");
+  }
+
+  __ movq(rdx, FieldOperand(rdx, AllocationSite::kPayloadOffset));
   __ SmiToInteger32(rdx, rdx);
   __ jmp(&switch_ready);
   __ bind(&no_info);
   __ movq(rdx, Immediate(GetInitialFastElementsKind()));
   __ bind(&switch_ready);
 
   if (argument_count_ == ANY) {
     Label not_zero_case, not_one_case;
     __ testq(rax, rax);
     __ j(not_zero, &not_zero_case);
@@ skipping 105 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64