8264016: [JVMCI] add some thread local fields for use by JVMCI

Reviewed-by: shade Backport-of: 182b11c

Author: jerboaa

src/hotspot/share/jvmci/vmStructs_jvmci.cpp

@@ -179,6 +179,9 @@
  nonstatic_field(JavaThread, _pending_failed_speculation, long) \
  nonstatic_field(JavaThread, _pending_transfer_to_interpreter, bool) \
  nonstatic_field(JavaThread, _jvmci_counters, jlong*) \
+ nonstatic_field(JavaThread, _jvmci_reserved0, intptr_t*) \
+ nonstatic_field(JavaThread, _jvmci_reserved1, intptr_t*) \
+ nonstatic_field(JavaThread, _jvmci_reserved_oop0, oop) \
  nonstatic_field(JavaThread, _reserved_stack_activation, address) \
  \
  static_field(java_lang_Class, _klass_offset, int) \

src/hotspot/share/runtime/thread.cpp

@@ -1622,6 +1622,9 @@ void JavaThread::initialize() {
  _adjusting_comp_level = false;
  _jvmci._alternate_call_target = NULL;
 assert(_jvmci._implicit_exception_pc == NULL, "must be");
+ _jvmci_reserved0 = NULL;
+ _jvmci_reserved1 = NULL;
+ _jvmci_reserved_oop0 = NULL;
 if (JVMCICounterSize > 0) {
  _jvmci_counters = NEW_C_HEAP_ARRAY(jlong, JVMCICounterSize, mtInternal);
 memset(_jvmci_counters, 0, sizeof(jlong) * JVMCICounterSize);
@@ -2923,6 +2926,9 @@ void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) {
  f->do_oop((oop*) &_vm_result);
  f->do_oop((oop*) &_exception_oop);
  f->do_oop((oop*) &_pending_async_exception);
+#if INCLUDE_JVMCI
+ f->do_oop((oop*) &_jvmci_reserved_oop0);
+#endif
 
 if (jvmti_thread_state() != NULL) {
 jvmti_thread_state()->oops_do(f, cf);

src/hotspot/share/runtime/thread.hpp

@@ -1083,6 +1083,11 @@ class JavaThread: public Thread {
 // Support for high precision, thread sensitive counters in JVMCI compiled code.
  jlong* _jvmci_counters;
 
+// Fast thread locals for use by JVMCI
+intptr_t* _jvmci_reserved0;
+intptr_t* _jvmci_reserved1;
+ oop _jvmci_reserved_oop0;
+
 public:
 static jlong* _jvmci_old_thread_counters;
 staticvoidcollect_counters(typeArrayOop array);