Provide call counts for constructor calls, surface them as a vector IC.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 2626 matching lines @@
   ASM_LOCATION("GenerateRecordCallTarget");
   DCHECK(!AreAliased(scratch1, scratch2, scratch3, argc, function,
                      feedback_vector, index, new_target));
   // Cache the called function in a feedback vector slot. Cache states are
   // uninitialized, monomorphic (indicated by a JSFunction), and megamorphic.
   //  argc :            number of arguments to the construct function
   //  function :        the function to call
   //  feedback_vector : the feedback vector
   //  index :           slot in feedback vector (smi)
   Label initialize, done, miss, megamorphic, not_array_function;
+  Label done_increment_count;
 
   DCHECK_EQ(*TypeFeedbackVector::MegamorphicSentinel(masm->isolate()),
             masm->isolate()->heap()->megamorphic_symbol());
   DCHECK_EQ(*TypeFeedbackVector::UninitializedSentinel(masm->isolate()),
             masm->isolate()->heap()->uninitialized_symbol());
 
   // Load the cache state.
   Register feedback = scratch1;
   Register feedback_map = scratch2;
   Register feedback_value = scratch3;
   __ Add(feedback, feedback_vector,
          Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(feedback, FieldMemOperand(feedback, FixedArray::kHeaderSize));
 
   // A monomorphic cache hit or an already megamorphic state: invoke the
   // function without changing the state.
   // We don't know if feedback value is a WeakCell or a Symbol, but it's
   // harmless to read at this position in a symbol (see static asserts in
   // type-feedback-vector.h).
   Label check_allocation_site;
   __ Ldr(feedback_value, FieldMemOperand(feedback, WeakCell::kValueOffset));
   __ Cmp(function, feedback_value);
-  __ B(eq, &done);
+  __ B(eq, &done_increment_count);
   __ CompareRoot(feedback, Heap::kmegamorphic_symbolRootIndex);
   __ B(eq, &done);
   __ Ldr(feedback_map, FieldMemOperand(feedback, HeapObject::kMapOffset));
   __ CompareRoot(feedback_map, Heap::kWeakCellMapRootIndex);
   __ B(ne, &check_allocation_site);
 
   // If the weak cell is cleared, we have a new chance to become monomorphic.
   __ JumpIfSmi(feedback_value, &initialize);
   __ B(&megamorphic);
 
   __ bind(&check_allocation_site);
   // 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 slot either some other function or an
   // AllocationSite.
   __ JumpIfNotRoot(feedback_map, Heap::kAllocationSiteMapRootIndex, &miss);
 
   // Make sure the function is the Array() function
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, scratch1);
   __ Cmp(function, scratch1);
   __ B(ne, &megamorphic);
-  __ B(&done);
+  __ B(&done_increment_count);
 
   __ Bind(&miss);
 
   // A monomorphic miss (i.e, here the cache is not uninitialized) goes
   // megamorphic.
   __ JumpIfRoot(scratch1, Heap::kuninitialized_symbolRootIndex, &initialize);
   // MegamorphicSentinel is an immortal immovable object (undefined) so no
   // write-barrier is needed.
   __ Bind(&megamorphic);
   __ Add(scratch1, feedback_vector,
          Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ LoadRoot(scratch2, Heap::kmegamorphic_symbolRootIndex);
   __ Str(scratch2, FieldMemOperand(scratch1, FixedArray::kHeaderSize));
   __ B(&done);
 
   // An uninitialized cache is patched with the function or sentinel to
   // indicate the ElementsKind if function is the Array constructor.
   __ Bind(&initialize);
 
+  // Initialize the call counter.
+  __ Mov(scratch1, Smi::FromInt(ConstructICNexus::kCallCountIncrement));
+  __ Adds(scratch2, feedback_vector,
+          Operand::UntagSmiAndScale(index, kPointerSizeLog2));
+  __ Str(scratch1,
+         FieldMemOperand(scratch2, FixedArray::kHeaderSize + kPointerSize));
+
   // Make sure the function is the Array() function
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, scratch1);
   __ Cmp(function, scratch1);
   __ B(ne, &not_array_function);
 
   // The target function is the Array constructor,
   // Create an AllocationSite if we don't already have it, store it in the
   // slot.
   CreateAllocationSiteStub create_stub(masm->isolate());
   CallStubInRecordCallTarget(masm, &create_stub, argc, function,
                              feedback_vector, index, new_target);
   __ B(&done);
 
   __ Bind(&not_array_function);
   CreateWeakCellStub weak_cell_stub(masm->isolate());
   CallStubInRecordCallTarget(masm, &weak_cell_stub, argc, function,
                              feedback_vector, index, new_target);
+  __ B(&done);
+
+  __ bind(&done_increment_count);
+  __ Adds(scratch2, feedback_vector,
+          Operand::UntagSmiAndScale(index, kPointerSizeLog2));
+  __ Ldr(scratch1,
+         FieldMemOperand(scratch2, FixedArray::kHeaderSize + kPointerSize));
+  __ Add(scratch1, scratch1,
+         Operand(Smi::FromInt(CallICNexus::kCallCountIncrement)));
+  __ Str(scratch1,
+         FieldMemOperand(scratch2, FixedArray::kHeaderSize + kPointerSize));
+
   __ Bind(&done);
 }
 
 
-void CallConstructStub::Generate(MacroAssembler* masm) {
+void ConstructICStub::Generate(MacroAssembler* masm) {
   ASM_LOCATION("CallConstructStub::Generate");
   // x0 : number of arguments
   // x1 : the function to call
   // x2 : feedback vector
   // x3 : slot in feedback vector (Smi, for RecordCallTarget)
   Register function = x1;
 
   Label non_function;
   // Check that the function is not a smi.
   __ JumpIfSmi(function, &non_function);
@@ skipping 3050 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64