Initial support for count-based profiling

src/x64/full-codegen-x64.cc

 // Copyright 2012 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 299 matching lines @@
     EmitReturnSequence();
   }
 }
 
 
 void FullCodeGenerator::ClearAccumulator() {
   __ Set(rax, 0);
 }
 
 
-void FullCodeGenerator::EmitStackCheck(IterationStatement* stmt) {
+void FullCodeGenerator::EmitStackCheck(IterationStatement* stmt,
+                                       Label* back_edge_target) {
   Comment cmnt(masm_, "[ Stack check");
   Label ok;
   __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
   __ j(above_equal, &ok, Label::kNear);
   StackCheckStub stub;
   __ CallStub(&stub);
   // Record a mapping of this PC offset to the OSR id.  This is used to find
   // the AST id from the unoptimized code in order to use it as a key into
   // the deoptimization input data found in the optimized code.
   RecordStackCheck(stmt->OsrEntryId());
@@ skipping 733 matching lines @@
   }
 
   // Generate code for the body of the loop.
   Visit(stmt->body());
 
   // Generate code for going to the next element by incrementing the
   // index (smi) stored on top of the stack.
   __ bind(loop_statement.continue_label());
   __ SmiAddConstant(Operand(rsp, 0 * kPointerSize), Smi::FromInt(1));
 
-  EmitStackCheck(stmt);
+  EmitStackCheck(stmt, &loop);
   __ jmp(&loop);
 
   // Remove the pointers stored on the stack.
   __ bind(loop_statement.break_label());
   __ addq(rsp, Immediate(5 * kPointerSize));
 
   // Exit and decrement the loop depth.
   __ bind(&exit);
   decrement_loop_depth();
 }
@@ skipping 3297 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64