New approach to Crankshaft decision-making

src/arm/full-codegen-arm.cc

 // Copyright 2011 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 121 matching lines @@
   SetFunctionPosition(function());
   Comment cmnt(masm_, "[ function compiled by full code generator");
 
 #ifdef DEBUG
   if (strlen(FLAG_stop_at) > 0 &&
       info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
     __ stop("stop-at");
   }
 #endif
 
+  // Primitive functions are unlikely to be picked up by the stack-walking
+  // profiler, so they trigger their own optimization when they're called
+  // for the SharedFunctionInfo::kCallsUntilPrimitiveOptimization-th time.
+  if (info->function()->is_primitive() &&
+      !info->shared_info().is_null() &&
+      FLAG_crankshaft) {
+    info->shared_info()->set_call_counter(
+        SharedFunctionInfo::kCallsUntilPrimitiveOptimization);
+    __ mov(r2, Operand(info->shared_info()));
+    // r2: shared function info
+    __ ldr(r3, FieldMemOperand(r2, SharedFunctionInfo::kCallCounterOffset));
+    __ sub(r3, r3, Operand(Smi::FromInt(1)), SetCC);
+    __ str(r3, FieldMemOperand(r2, SharedFunctionInfo::kCallCounterOffset));
+    Handle<Code> compile_stub(
+        isolate()->builtins()->builtin(Builtins::kLazyRecompile));
+    __ Jump(compile_stub, RelocInfo::CODE_TARGET, eq);
+  }
+
   // Strict mode functions and builtins need to replace the receiver
   // with undefined when called as functions (without an explicit
   // receiver object). r5 is zero for method calls and non-zero for
   // function calls.
   if (!info->is_classic_mode() || info->is_native()) {
     Label ok;
     __ cmp(r5, Operand(0));
     __ b(eq, &ok);
     int receiver_offset = info->scope()->num_parameters() * kPointerSize;
     __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
@@ skipping 4234 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM