Create AllocationSite objects, pointed to by AllocationSiteInfo.

src/arm/code-stubs-arm.cc

 // Copyright 2012 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 42 matching lines @@
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   static Register registers[] = { r3, r2, r1, r0 };
   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[] = { r2 };
+  descriptor->register_param_count_ = 1;
+  descriptor->register_params_ = registers;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
 void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   static Register registers[] = { r1, r0 };
   descriptor->register_param_count_ = 2;
   descriptor->register_params_ = registers;
   descriptor->deoptimization_handler_ =
       FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
 }
 
@@ skipping 2921 matching lines @@
 }
 
 
 void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
   CEntryStub::GenerateAheadOfTime(isolate);
   WriteInt32ToHeapNumberStub::GenerateFixedRegStubsAheadOfTime(isolate);
   StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(isolate);
   StubFailureTrampolineStub::GenerateAheadOfTime(isolate);
   RecordWriteStub::GenerateFixedRegStubsAheadOfTime(isolate);
   ArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
+  CreateAllocationSiteStub::GenerateAheadOfTime(isolate);
 }
 
 
 void CodeStub::GenerateFPStubs(Isolate* isolate) {
   SaveFPRegsMode mode = kSaveFPRegs;
   CEntryStub save_doubles(1, mode);
   StoreBufferOverflowStub stub(mode);
   // These stubs might already be in the snapshot, detect that and don't
   // regenerate, which would lead to code stub initialization state being messed
   // up.
@@ skipping 1628 matching lines @@
   ASSERT_EQ(*TypeFeedbackCells::UninitializedSentinel(masm->isolate()),
             masm->isolate()->heap()->the_hole_value());
 
   // Load the cache state into r3.
   __ ldr(r3, FieldMemOperand(r2, Cell::kValueOffset));
 
   // A monomorphic cache hit or an already megamorphic state: invoke the
   // function without changing the state.
   __ cmp(r3, r1);
   __ b(eq, &done);
-  __ CompareRoot(r3, Heap::kUndefinedValueRootIndex);
-  __ b(eq, &done);
+
+  /*
+    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 ecx
+  */
+  Handle<Map> allocation_site_map(
+      masm->isolate()->heap()->allocation_site_map(),
+      masm->isolate());
+  __ ldr(r5, FieldMemOperand(r3, 0));
+  __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
+  __ b(ne, &miss);
 
   // Special handling of the Array() function, which caches not only the
   // monomorphic Array function but the initial ElementsKind with special
   // sentinels
-  __ JumpIfNotSmi(r3, &miss);
-  if (FLAG_debug_code) {
-    Handle<Object> terminal_kind_sentinel =
-        TypeFeedbackCells::MonomorphicArraySentinel(masm->isolate(),
-                                                    LAST_FAST_ELEMENTS_KIND);
-    __ cmp(r3, Operand(terminal_kind_sentinel));
-    __ Assert(le, "Array function sentinel is not an ElementsKind");
-  }
-
   // Make sure the function is the Array() function
   __ LoadArrayFunction(r3);
   __ cmp(r1, r3);
   __ b(ne, &megamorphic);
   __ jmp(&done);
 
   __ bind(&miss);
 
   // A monomorphic miss (i.e, here the cache is not uninitialized) goes
   // megamorphic.
   __ CompareRoot(r3, Heap::kTheHoleValueRootIndex);
   __ b(eq, &initialize);
   // MegamorphicSentinel is an immortal immovable object (undefined) so no
   // write-barrier is needed.
   __ bind(&megamorphic);
   __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
   __ str(ip, FieldMemOperand(r2, Cell::kValueOffset));
   __ 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(r3);
   __ cmp(r1, r3);
   __ b(ne, &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(masm->isolate(),
-          GetInitialFastElementsKind());
-  __ mov(r3, Operand(initial_kind_sentinel));
-  __ str(r3, FieldMemOperand(r2, Cell::kValueOffset));
+  // 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(r0);
+    __ push(r1);
+    __ push(r2);
+
+    CreateAllocationSiteStub create_stub;
+    __ CallStub(&create_stub);
+
+    __ pop(r2);
+    __ pop(r1);
+    __ pop(r0);
+  }
   __ b(&done);
 
   __ bind(&not_array_function);
   __ str(r1, FieldMemOperand(r2, Cell::kValueOffset));
   // No need for a write barrier here - cells are rescanned.
 
   __ bind(&done);
 }
 
 
@@ skipping 2462 matching lines @@
   // r0 - number of arguments
   // r1 - constructor?
   // sp[0] - last argument
   ASSERT(FAST_SMI_ELEMENTS == 0);
   ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
   ASSERT(FAST_ELEMENTS == 2);
   ASSERT(FAST_HOLEY_ELEMENTS == 3);
   ASSERT(FAST_DOUBLE_ELEMENTS == 4);
   ASSERT(FAST_HOLEY_DOUBLE_ELEMENTS == 5);
 
-  Handle<Object> undefined_sentinel(
-      masm->isolate()->heap()->undefined_value(),
-      masm->isolate());
-
   // is the low bit set? If so, we are holey and that is good.
   __ tst(r3, Operand(1));
   Label normal_sequence;
   __ b(ne, &normal_sequence);
 
   // look at the first argument
   __ ldr(r5, MemOperand(sp, 0));
   __ cmp(r5, Operand::Zero());
   __ b(eq, &normal_sequence);
 
   // We are going to create a holey array, but our kind is non-holey.
   // Fix kind and retry
   __ add(r3, r3, Operand(1));
-  __ cmp(r2, Operand(undefined_sentinel));
+  __ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
   __ b(eq, &normal_sequence);
 
-  // The type cell may have gone megamorphic, don't overwrite if so
-  __ ldr(r5, FieldMemOperand(r2, kPointerSize));
-  __ JumpIfNotSmi(r5, &normal_sequence);
+  __ ldr(r5, FieldMemOperand(r2, Cell::kValueOffset));
+  __ ldr(r5, FieldMemOperand(r5, 0));
+  __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
+  __ b(ne, &normal_sequence);
 
   // Save the resulting elements kind in type info
   __ SmiTag(r3);
-  __ str(r3, FieldMemOperand(r2, kPointerSize));
+  __ ldr(r5, FieldMemOperand(r2, Cell::kValueOffset));
+  __ str(r3, FieldMemOperand(r5, AllocationSite::kPayloadOffset));
   __ SmiUntag(r3);
 
   __ 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);
     __ cmp(r3, Operand(kind));
     __ b(ne, &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 20 matching lines @@
 
 
 void ArrayConstructorStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r0 : argc (only if argument_count_ == ANY)
   //  -- r1 : constructor
   //  -- r2 : type info cell
   //  -- sp[0] : return address
   //  -- sp[4] : last argument
   // -----------------------------------
-  Handle<Object> undefined_sentinel(
-      masm->isolate()->heap()->undefined_value(),
-      masm->isolate());
-
   if (FLAG_debug_code) {
     // The array construct code is only set for the global and natives
     // builtin Array functions which always have maps.
 
     // Initial map for the builtin Array function should be a map.
     __ ldr(r3, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi.
     __ tst(r3, Operand(kSmiTagMask));
     __ Assert(ne, "Unexpected initial map for Array function");
     __ CompareObjectType(r3, r3, r4, MAP_TYPE);
     __ Assert(eq, "Unexpected initial map for Array function");
 
     // We should either have undefined in ebx or a valid cell
     Label okay_here;
     Handle<Map> cell_map = masm->isolate()->factory()->cell_map();
-    __ cmp(r2, Operand(undefined_sentinel));
+    __ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
     __ b(eq, &okay_here);
     __ ldr(r3, FieldMemOperand(r2, 0));
     __ cmp(r3, Operand(cell_map));
     __ Assert(eq, "Expected property cell in register ebx");
     __ bind(&okay_here);
   }
 
   Label no_info, switch_ready;
   // Get the elements kind and case on that.
-  __ cmp(r2, Operand(undefined_sentinel));
+  __ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
   __ b(eq, &no_info);
   __ ldr(r3, FieldMemOperand(r2, Cell::kValueOffset));
-  __ JumpIfNotSmi(r3, &no_info);
+
+  // The type cell may have undefined in its value.
+  __ CompareRoot(r3, Heap::kUndefinedValueRootIndex);
+  __ b(eq, &no_info);
+
+  // We should have an allocation site object
+  if (FLAG_debug_code) {
+    __ push(r3);
+    __ ldr(r3, FieldMemOperand(r3, 0));
+    __ CompareRoot(r3, Heap::kAllocationSiteMapRootIndex);
+    __ Assert(eq, "Expected AllocationSite object in register edx");
+  }
+
+  __ ldr(r3, FieldMemOperand(r3, AllocationSite::kPayloadOffset));
   __ SmiUntag(r3);
   __ jmp(&switch_ready);
   __ bind(&no_info);
   __ mov(r3, Operand(GetInitialFastElementsKind()));
   __ bind(&switch_ready);
 
   if (argument_count_ == ANY) {
     Label not_zero_case, not_one_case;
     __ tst(r0, r0);
     __ b(ne, &not_zero_case);
@@ skipping 101 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM