Add counters for write barriers in generated code.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/78953003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18029 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/macro-assembler-arm.cc

@@ -516,6 +516,12 @@ void MacroAssembler::RecordWrite(Register object,
     Check(eq, kWrongAddressOrValuePassedToRecordWrite);
   }
 
+  // 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;
 
   if (smi_check == INLINE_SMI_CHECK) {

src/ia32/macro-assembler-ia32.cc

@@ -614,6 +614,10 @@ void MacroAssembler::RecordWriteForMap(
     return;
   }
 
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1);
+
   // A single check of the map's pages interesting flag suffices, since it is
   // only set during incremental collection, and then it's also guaranteed that
   // the from object's page's interesting flag is also set.  This optimization
@@ -670,6 +674,10 @@ void MacroAssembler::RecordWrite(Register object,
     bind(&ok);
   }
 
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1);
+
   // First, check if a write barrier is even needed. The tests below
   // catch stores of Smis and stores into young gen.
   Label done;

src/mips/macro-assembler-mips.cc

@@ -275,6 +275,12 @@ void MacroAssembler::RecordWrite(Register object,
         eq, kWrongAddressOrValuePassedToRecordWrite, at, Operand(value));
   }
 
+  // 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;
 
   if (smi_check == INLINE_SMI_CHECK) {

src/v8-counters.h

@@ -261,6 +261,9 @@ namespace internal {
   SC(soft_deopts_requested, V8.SoftDeoptsRequested)                   \
   SC(soft_deopts_inserted, V8.SoftDeoptsInserted)                     \
   SC(soft_deopts_executed, V8.SoftDeoptsExecuted)                     \
+  /* Number of write barriers in generated code. */                   \
+  SC(write_barriers_dynamic, V8.WriteBarriersDynamic)                 \
+  SC(write_barriers_static, V8.WriteBarriersStatic)                   \
   SC(new_space_bytes_available, V8.MemoryNewSpaceBytesAvailable)      \
   SC(new_space_bytes_committed, V8.MemoryNewSpaceBytesCommitted)      \
   SC(new_space_bytes_used, V8.MemoryNewSpaceBytesUsed)                \

src/x64/macro-assembler-x64.cc

@@ -405,6 +405,10 @@ void MacroAssembler::RecordWrite(Register object,
     bind(&ok);
   }
 
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1);
+
   // First, check if a write barrier is even needed. The tests below
   // catch stores of smis and stores into the young generation.
   Label done;