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

src/arm/code-stubs-arm.cc

 // Copyright 2012 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_ARM
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2268 matching lines @@
 
 static void GenerateRecordCallTarget(MacroAssembler* masm) {
   // Cache the called function in a feedback vector slot.  Cache states
   // are uninitialized, monomorphic (indicated by a JSFunction), and
   // megamorphic.
   // r0 : number of arguments to the construct function
   // r1 : the function to call
   // r2 : feedback vector
   // r3 : 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 into r5.
   __ add(r5, r2, Operand::PointerOffsetFromSmiKey(r3));
   __ ldr(r5, FieldMemOperand(r5, FixedArray::kHeaderSize));
 
   // A monomorphic cache hit or an already megamorphic state: invoke the
   // function without changing the state.
   // We don't know if r5 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;
   Register feedback_map = r6;
   Register weak_value = r9;
   __ ldr(weak_value, FieldMemOperand(r5, WeakCell::kValueOffset));
   __ cmp(r1, weak_value);
-  __ b(eq, &done);
+  __ b(eq, &done_increment_count);
   __ CompareRoot(r5, Heap::kmegamorphic_symbolRootIndex);
   __ b(eq, &done);
   __ ldr(feedback_map, FieldMemOperand(r5, 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(weak_value, &initialize);
   __ jmp(&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.
   __ CompareRoot(feedback_map, Heap::kAllocationSiteMapRootIndex);
   __ b(ne, &miss);
 
   // Make sure the function is the Array() function
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, r5);
   __ cmp(r1, r5);
   __ b(ne, &megamorphic);
-  __ jmp(&done);
+  __ jmp(&done_increment_count);
 
   __ bind(&miss);
 
   // A monomorphic miss (i.e, here the cache is not uninitialized) goes
   // megamorphic.
   __ CompareRoot(r5, Heap::kuninitialized_symbolRootIndex);
   __ b(eq, &initialize);
   // MegamorphicSentinel is an immortal immovable object (undefined) so no
   // write-barrier is needed.
   __ bind(&megamorphic);
   __ add(r5, r2, Operand::PointerOffsetFromSmiKey(r3));
   __ LoadRoot(ip, Heap::kmegamorphic_symbolRootIndex);
   __ str(ip, FieldMemOperand(r5, FixedArray::kHeaderSize));
   __ jmp(&done);
 
   // An uninitialized cache is patched with the function
   __ bind(&initialize);
 
+  // Initialize the call counter.
+  __ Move(r5, Operand(Smi::FromInt(CallICNexus::kCallCountIncrement)));
+  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
+  __ str(r5, FieldMemOperand(r4, FixedArray::kHeaderSize + kPointerSize));
+
   // Make sure the function is the Array() function
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, r5);
   __ cmp(r1, r5);
   __ 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);
   __ b(&done);
 
   __ bind(&not_array_function);
   CreateWeakCellStub weak_cell_stub(masm->isolate());
   CallStubInRecordCallTarget(masm, &weak_cell_stub);
+  __ b(&done);
+
+  __ bind(&done_increment_count);
+  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
+  __ add(r4, r4, Operand(FixedArray::kHeaderSize + kPointerSize));
+  __ ldr(r5, FieldMemOperand(r4, 0));
+  __ add(r5, r5, Operand(Smi::FromInt(CallICNexus::kCallCountIncrement)));
+  __ str(r5, FieldMemOperand(r4, 0));
+
   __ bind(&done);
 }
 
 
-void CallConstructStub::Generate(MacroAssembler* masm) {
+void ConstructICStub::Generate(MacroAssembler* masm) {
   // r0 : number of arguments
   // r1 : the function to call
   // r2 : feedback vector
   // r3 : slot in feedback vector (Smi, for RecordCallTarget)
 
   Label non_function;
   // Check that the function is not a smi.
   __ JumpIfSmi(r1, &non_function);
   // Check that the function is a JSFunction.
   __ CompareObjectType(r1, r5, r5, JS_FUNCTION_TYPE);
@@ skipping 2987 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM