Support for dynamic write-barrier counters everywhere.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index b8cae01bc57d029b7f1a2f45ed88116a92b55b48..1adc79641781f44ffa93fa7440ec0cee37b5d9d1 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -521,10 +521,6 @@ void MacroAssembler::RecordWriteForMap(Register object,
     return;
   }
 
-  // Count number of write barriers in generated code.
-  isolate()->counters()->write_barriers_static()->Increment();
-  // TODO(mstarzinger): Dynamic counter missing.
-
   if (emit_debug_code()) {
     ldr(ip, FieldMemOperand(object, HeapObject::kMapOffset));
     cmp(ip, map);
@@ -565,6 +561,10 @@ void MacroAssembler::RecordWriteForMap(Register object,
 
   bind(&done);
 
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1, ip, dst);
+
   // Clobber clobbered registers when running with the debug-code flag
   // turned on to provoke errors.
   if (emit_debug_code()) {
@@ -598,10 +598,6 @@ void MacroAssembler::RecordWrite(
     return;
   }
 
-  // Count number of write barriers in generated code.
-  isolate()->counters()->write_barriers_static()->Increment();
-  // TODO(mstarzinger): Dynamic counter missing.
-
   // First, check if a write barrier is even needed. The tests below
   // catch stores of smis and stores into the young generation.
   Label done;
@@ -636,6 +632,11 @@ void MacroAssembler::RecordWrite(
 
   bind(&done);
 
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1, ip,
+                   value);
+
   // Clobber clobbered registers when running with the debug-code flag
   // turned on to provoke errors.
   if (emit_debug_code()) {