Track JS allocations as they arrive with no affection on performance when tracking is switched off

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 99 matching lines @@
 static double* math_exp_log_table_array = NULL;
 
 // -----------------------------------------------------------------------------
 // Implementation of AssemblerBase
 
 AssemblerBase::AssemblerBase(Isolate* isolate, void* buffer, int buffer_size)
     : isolate_(isolate),
       jit_cookie_(0),
       enabled_cpu_features_(0),
       emit_debug_code_(FLAG_debug_code),
+      emit_allocations_tracking_code_(false),
       predictable_code_size_(false) {
   if (FLAG_mask_constants_with_cookie && isolate != NULL)  {
     jit_cookie_ = isolate->random_number_generator()->NextInt();
   }
 
   if (buffer == NULL) {
     // Do our own buffer management.
     if (buffer_size <= kMinimalBufferSize) {
       buffer_size = kMinimalBufferSize;
       if (isolate->assembler_spare_buffer() != NULL) {
@@ skipping 1198 matching lines @@
       reinterpret_cast<void*>(&double_constants.canonical_non_hole_nan));
 }
 
 
 ExternalReference ExternalReference::address_of_the_hole_nan() {
   return ExternalReference(
       reinterpret_cast<void*>(&double_constants.the_hole_nan));
 }
 
 
+ExternalReference ExternalReference::record_object_allocation_function(
+  Isolate* isolate) {
+  return ExternalReference(
+      Redirect(isolate,
+               FUNCTION_ADDR(HeapProfiler::RecordObjectAllocationFromMasm)));
+}
+
+
 #ifndef V8_INTERPRETED_REGEXP
 
 ExternalReference ExternalReference::re_check_stack_guard_state(
     Isolate* isolate) {
   Address function;
 #if V8_TARGET_ARCH_X64
   function = FUNCTION_ADDR(RegExpMacroAssemblerX64::CheckStackGuardState);
 #elif V8_TARGET_ARCH_IA32
   function = FUNCTION_ADDR(RegExpMacroAssemblerIA32::CheckStackGuardState);
 #elif V8_TARGET_ARCH_ARM
@@ skipping 348 matching lines @@
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
     state_.written_position = state_.current_position;
     written = true;
   }
 
   // Return whether something was written.
   return written;
 }
 
 } }  // namespace v8::internal