src/hotspot/share/gc/shared/weakProcessorPhases.cpp
author avoitylov
Thu, 30 Aug 2018 16:33:14 -0400
changeset 51599 3198179d97fa
parent 51546 b9f6a4427da9
child 53536 482109fae02b
permissions -rw-r--r--
8210164: building Minimal VM fails with error: comparison of unsigned expression < 0 is always false [-Werror=type-limits] Summary: Conditionalize compare with serial_phase_count. Reviewed-by: kbarrett, shade

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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#include "precompiled.hpp"
#include "classfile/systemDictionary.hpp"
#include "gc/shared/weakProcessorPhases.hpp"
#include "runtime/jniHandles.hpp"
#include "utilities/debug.hpp"
#include "utilities/macros.hpp"

#if INCLUDE_JFR
#include "jfr/jfr.hpp"
#endif // INCLUDE_JFR

#if INCLUDE_JVMTI
#include "prims/jvmtiExport.hpp"
#endif // INCLUDE_JVMTI

WeakProcessorPhases::Phase WeakProcessorPhases::phase(uint value) {
  assert(value < phase_count, "Invalid phase value %u", value);
  return static_cast<Phase>(value);
}

uint WeakProcessorPhases::index(Phase phase) {
  uint value = static_cast<uint>(phase);
  assert(value < phase_count, "Invalid phase %u", value);
  return value;
}

uint WeakProcessorPhases::serial_index(Phase phase) {
  assert(is_serial(phase), "not serial phase %u", index(phase));
  return index(phase) - serial_phase_start;
}

uint WeakProcessorPhases::oop_storage_index(Phase phase) {
  assert(is_oop_storage(phase), "not oop storage phase %u", index(phase));
  return index(phase) - oop_storage_phase_start;
}

bool WeakProcessorPhases::is_serial(Phase phase) {
  // serial_phase_count is 0 if JFR and JVMTI are both not built,
  // making this check with unsigned lhs redundant
#if INCLUDE_JVMTI || INCLUDE_JFR
  return (index(phase) - serial_phase_start) < serial_phase_count;
#else
  STATIC_ASSERT(serial_phase_count == 0);
  return false;
#endif
}

bool WeakProcessorPhases::is_oop_storage(Phase phase) {
  return (index(phase) - oop_storage_phase_start) < oop_storage_phase_count;
}

const char* WeakProcessorPhases::description(Phase phase) {
  switch (phase) {
  JVMTI_ONLY(case jvmti: return "JVMTI weak processing";)
  JFR_ONLY(case jfr: return "JFR weak processing";)
  case jni: return "JNI weak processing";
  case vm: return "VM weak processing";
  default:
    ShouldNotReachHere();
    return "Invalid weak processing phase";
  }
}

WeakProcessorPhases::Processor WeakProcessorPhases::processor(Phase phase) {
  switch (phase) {
  JVMTI_ONLY(case jvmti: return &JvmtiExport::weak_oops_do;)
  JFR_ONLY(case jfr: return &Jfr::weak_oops_do;)
  default:
    ShouldNotReachHere();
    return NULL;
  }
}

OopStorage* WeakProcessorPhases::oop_storage(Phase phase) {
  switch (phase) {
  case jni: return JNIHandles::weak_global_handles();
  case vm: return SystemDictionary::vm_weak_oop_storage();
  default:
    ShouldNotReachHere();
    return NULL;
  }
}