Change the maximum optimization count into a commandline flag.

This is needed for some unit tests, which otherwise do not test what people
think they do. ;-)

Review URL: https://chromiumcodereview.appspot.com/10823362

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12318 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler.cc

@@ -240,7 +240,7 @@ OptimizingCompiler::Status OptimizingCompiler::CreateGraph() {
   // Limit the number of times we re-compile a functions with
   // the optimizing compiler.
   const int kMaxOptCount =
-      FLAG_deopt_every_n_times == 0 ? Compiler::kDefaultMaxOptCount : 1000;
+      FLAG_deopt_every_n_times == 0 ? FLAG_max_opt_count : 1000;
   if (info()->shared_info()->opt_count() > kMaxOptCount) {
     return AbortOptimization();
   }

src/compiler.h

@@ -410,10 +410,6 @@ class OptimizingCompiler: public ZoneObject {
 
 class Compiler : public AllStatic {
  public:
-  // Default maximum number of function optimization attempts before we
-  // give up.
-  static const int kDefaultMaxOptCount = 10;
-
   static const int kMaxInliningLevels = 3;
 
   // Call count before primitive functions trigger their own optimization.

src/flag-definitions.h

@@ -324,6 +324,8 @@ DEFINE_bool(always_full_compiler, false,
             "try to use the dedicated run-once backend for all code")
 DEFINE_bool(trace_bailout, false,
             "print reasons for falling back to using the classic V8 backend")
+DEFINE_int(max_opt_count, 10,
+           "maximum number of optimization attempts before giving up.")
 
 // compilation-cache.cc
 DEFINE_bool(compilation_cache, true, "enable compilation cache")

src/hydrogen.cc

@@ -2029,7 +2029,7 @@ void HGlobalValueNumberer::ProcessLoopBlock(
 
 
 bool HGlobalValueNumberer::AllowCodeMotion() {
-  return info()->shared_info()->opt_count() + 1 < Compiler::kDefaultMaxOptCount;
+  return info()->shared_info()->opt_count() + 1 < FLAG_max_opt_count;
 }
 
 

src/objects.cc

@@ -7935,7 +7935,7 @@ void SharedFunctionInfo::ResetForNewContext(int new_ic_age) {
   if (code()->kind() == Code::FUNCTION) {
     code()->set_profiler_ticks(0);
     if (optimization_disabled() &&
-        opt_count() >= Compiler::kDefaultMaxOptCount) {
+        opt_count() >= FLAG_max_opt_count) {
       // Re-enable optimizations if they were disabled due to opt_count limit.
       set_optimization_disabled(false);
       code()->set_optimizable(true);

src/runtime-profiler.cc

@@ -304,7 +304,7 @@ void RuntimeProfiler::OptimizeNow() {
 
     // Do not record non-optimizable functions.
     if (shared->optimization_disabled()) {
-      if (shared->deopt_count() >= Compiler::kDefaultMaxOptCount) {
+      if (shared->deopt_count() >= FLAG_max_opt_count) {
         // If optimization was disabled due to many deoptimizations,
         // then check if the function is hot and try to reenable optimization.
         int ticks = shared_code->profiler_ticks();