Add --trace flag to fast compiler.

src/x64/fast-codegen-x64.cc

 // Copyright 2009 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 60 matching lines @@
     __ j(above_equal, &ok);
     StackCheckStub stub;
     __ CallStub(&stub);
     __ bind(&ok);
   }
 
   { Comment cmnt(masm_, "[ Declarations");
     VisitDeclarations(fun->scope()->declarations());
   }
 
+  if (FLAG_trace) {
+    __ CallRuntime(Runtime::kTraceEnter, 0);
+  }
+
   { Comment cmnt(masm_, "[ Body");
     VisitStatements(fun->body());
   }
 
   { Comment cmnt(masm_, "[ return <undefined>;");
     // Emit a 'return undefined' in case control fell off the end of the
     // body.
     __ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
     SetReturnPosition(fun);
+    if (FLAG_trace) {
+      __ push(rax);
+      __ CallRuntime(Runtime::kTraceExit, 1);
+    }
     __ RecordJSReturn();
+
     // Do not use the leave instruction here because it is too short to
     // patch with the code required by the debugger.
     __ movq(rsp, rbp);
     __ pop(rbp);
     __ ret((fun->scope()->num_parameters() + 1) * kPointerSize);
 #ifdef ENABLE_DEBUGGER_SUPPORT
     // Add padding that will be overwritten by a debugger breakpoint.  We
     // have just generated "movq rsp, rbp; pop rbp; ret k" with length 7
     // (3 + 1 + 3).
     const int kPadding = Debug::kX64JSReturnSequenceLength - 7;
@@ skipping 38 matching lines @@
   // Complete the statement based on the location of the subexpression.
   Location source = expr->location();
   ASSERT(!source.is_nowhere());
   if (source.is_temporary()) {
     __ pop(rax);
   } else {
     ASSERT(source.is_constant());
     ASSERT(expr->AsLiteral() != NULL);
     __ Move(rax, expr->AsLiteral()->handle());
   }
+  if (FLAG_trace) {
+    __ push(rax);
+    __ CallRuntime(Runtime::kTraceExit, 1);
+  }
+
   __ RecordJSReturn();
   // Do not use the leave instruction here because it is too short to
   // patch with the code required by the debugger.
   __ movq(rsp, rbp);
   __ pop(rbp);
   __ ret((function_->scope()->num_parameters() + 1) * kPointerSize);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Add padding that will be overwritten by a debugger breakpoint.  We
   // have just generated "movq rsp, rbp; pop rbp; ret k" with length 7
   // (3 + 1 + 3).
@@ skipping 188 matching lines @@
   __ CallRuntime(function, arg_count);
   if (expr->location().is_temporary()) {
     __ push(rax);
   } else {
     ASSERT(expr->location().is_nowhere());
   }
 }
 
 
 } }  // namespace v8::internal