c1 overflow fix

Author: bulasevich

src/hotspot/share/c1/c1_Compiler.cpp

@@ -49,6 +49,7 @@ Compiler::Compiler() : AbstractCompiler(compiler_c1) {
 }
 
 void Compiler::init_c1_runtime() {
+  if (Runtime1::blob_for((Runtime1::StubID)0) == nullptr) // check if Runtime1 is initialized
   Runtime1::initialize(CompilerThread::current()->get_buffer_blob());
 }
 
@@ -243,7 +244,9 @@ bool Compiler::is_intrinsic_supported(vmIntrinsics::ID id) {
 }
 
 void Compiler::compile_method(ciEnv* env, ciMethod* method, int entry_bci, bool install_code, DirectiveSet* directive) {
-  BufferBlob* buffer_blob = init_buffer_blob();
+  BufferBlob* buffer_blob = CompilerThread::current()->get_buffer_blob();
+  if (buffer_blob == nullptr) { buffer_blob = init_buffer_blob(); }
+
   if (buffer_blob == nullptr) {
     warning("no space to run C1 compiler");
     return;

src/hotspot/share/c1/c1_Runtime1.cpp

@@ -109,7 +109,7 @@ void StubAssembler::set_num_rt_args(int args) {
 
 // Implementation of Runtime1
 
-CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids];
+CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids] = {nullptr};
 const char *Runtime1::_blob_names[] = {
   RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME)
 };

src/hotspot/share/opto/output.cpp

@@ -253,7 +253,7 @@ PhaseOutput::PhaseOutput()
 PhaseOutput::~PhaseOutput() {
   C->set_output(nullptr);
   if (_scratch_buffer_blob != nullptr) {
-//    BufferBlob::free(_scratch_buffer_blob);
+    BufferBlob::free(_scratch_buffer_blob);
   }
 }