8049530: Provide descriptive failure reason for compilation tasks removed for the queue

Reviewed-by: roland, iveresov

src/share/vm/ci/ciEnv.cpp

@@ -1112,9 +1112,6 @@ int ciEnv::num_inlined_bytecodes() const {
 // ------------------------------------------------------------------
 // ciEnv::record_failure()
 void ciEnv::record_failure(const char* reason) {
-  if (log() != NULL) {
-    log()->elem("failure reason='%s'", reason);
-  }
   if (_failure_reason == NULL) {
     // Record the first failure reason.
     _failure_reason = reason;

src/share/vm/compiler/compileBroker.cpp

@@ -287,6 +287,7 @@ void CompileTask::initialize(int compile_id,
   _hot_count = hot_count;
   _time_queued = 0;  // tidy
   _comment = comment;
+  _failure_reason = NULL;
 
   if (LogCompilation) {
     _time_queued = os::elapsed_counter();
@@ -565,6 +566,11 @@ void CompileTask::log_task_done(CompileLog* log) {
   methodHandle method(thread, this->method());
   ResourceMark rm(thread);
 
+  if (!_is_success) {
+    const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
+    log->elem("failure reason='%s'", reason);
+  }
+
   // <task_done ... stamp='1.234'>  </task>
   nmethod* nm = code();
   log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
@@ -714,6 +720,7 @@ void CompileQueue::purge_stale_tasks() {
       for (CompileTask* task = head; task != NULL; ) {
         CompileTask* next_task = task->next();
         CompileTaskWrapper ctw(task); // Frees the task
+        task->set_failure_reason("stale task");
         task = next_task;
       }
     }
@@ -1788,6 +1795,7 @@ void CompileBroker::compiler_thread_loop() {
       } else {
         // After compilation is disabled, remove remaining methods from queue
         method->clear_queued_for_compilation();
+        task->set_failure_reason("compilation is disabled");
       }
     }
   }
@@ -1975,6 +1983,7 @@ void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
     compilable = ci_env.compilable();
 
     if (ci_env.failing()) {
+      task->set_failure_reason(ci_env.failure_reason());
       const char* retry_message = ci_env.retry_message();
       if (_compilation_log != NULL) {
         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);

src/share/vm/compiler/compileBroker.hpp

@@ -59,6 +59,7 @@ class CompileTask : public CHeapObj<mtCompiler> {
   jobject      _hot_method_holder;
   int          _hot_count;    // information about its invocation counter
   const char*  _comment;      // more info about the task
+  const char*  _failure_reason;
 
  public:
   CompileTask() {
@@ -130,6 +131,10 @@ public:
   void         log_task_queued();
   void         log_task_start(CompileLog* log);
   void         log_task_done(CompileLog* log);
+
+  void         set_failure_reason(const char* reason) {
+    _failure_reason = reason;
+  }
 };
 
 // CompilerCounters