8006005: Fix constant pool index validation and alignment trap for method parameter reflection
Summary: This patch addresses an alignment trap due to the storage format of method parameters data in constMethod. It also adds code to validate constant pool indexes for method parameters data.
Reviewed-by: jrose, dholmes
Contributed-by: eric.mccorkle@oracle.com
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#ifndef SHARE_VM_RUNTIME_VMTHREAD_HPP
#define SHARE_VM_RUNTIME_VMTHREAD_HPP
#include "runtime/perfData.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/vm_operations.hpp"
//
// Prioritized queue of VM operations.
//
// Encapsulates both queue management and
// and priority policy
//
class VMOperationQueue : public CHeapObj<mtInternal> {
private:
enum Priorities {
SafepointPriority, // Highest priority (operation executed at a safepoint)
MediumPriority, // Medium priority
nof_priorities
};
// We maintain a doubled linked list, with explicit count.
int _queue_length[nof_priorities];
int _queue_counter;
VM_Operation* _queue [nof_priorities];
// we also allow the vmThread to register the ops it has drained so we
// can scan them from oops_do
VM_Operation* _drain_list;
// Double-linked non-empty list insert.
void insert(VM_Operation* q,VM_Operation* n);
void unlink(VM_Operation* q);
// Basic queue manipulation
bool queue_empty (int prio);
void queue_add_front (int prio, VM_Operation *op);
void queue_add_back (int prio, VM_Operation *op);
VM_Operation* queue_remove_front(int prio);
void queue_oops_do(int queue, OopClosure* f);
void drain_list_oops_do(OopClosure* f);
VM_Operation* queue_drain(int prio);
// lock-free query: may return the wrong answer but must not break
bool queue_peek(int prio) { return _queue_length[prio] > 0; }
public:
VMOperationQueue();
// Highlevel operations. Encapsulates policy
bool add(VM_Operation *op);
VM_Operation* remove_next(); // Returns next or null
VM_Operation* remove_next_at_safepoint_priority() { return queue_remove_front(SafepointPriority); }
VM_Operation* drain_at_safepoint_priority() { return queue_drain(SafepointPriority); }
void set_drain_list(VM_Operation* list) { _drain_list = list; }
bool peek_at_safepoint_priority() { return queue_peek(SafepointPriority); }
// GC support
void oops_do(OopClosure* f);
void verify_queue(int prio) PRODUCT_RETURN;
};
//
// A single VMThread (the primordial thread) spawns all other threads
// and is itself used by other threads to offload heavy vm operations
// like scavenge, garbage_collect etc.
//
class VMThread: public NamedThread {
private:
static ThreadPriority _current_priority;
static bool _should_terminate;
static bool _terminated;
static Monitor * _terminate_lock;
static PerfCounter* _perf_accumulated_vm_operation_time;
void evaluate_operation(VM_Operation* op);
public:
// Constructor
VMThread();
// Tester
bool is_VM_thread() const { return true; }
bool is_GC_thread() const { return true; }
// The ever running loop for the VMThread
void loop();
// Called to stop the VM thread
static void wait_for_vm_thread_exit();
static bool should_terminate() { return _should_terminate; }
static bool is_terminated() { return _terminated == true; }
// Execution of vm operation
static void execute(VM_Operation* op);
// Returns the current vm operation if any.
static VM_Operation* vm_operation() { return _cur_vm_operation; }
// Returns the single instance of VMThread.
static VMThread* vm_thread() { return _vm_thread; }
// GC support
void oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf);
// Debugging
void print_on(outputStream* st) const;
void print() const { print_on(tty); }
void verify();
// Performance measurement
static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; }
// Entry for starting vm thread
virtual void run();
// Creations/Destructions
static void create();
static void destroy();
private:
// VM_Operation support
static VM_Operation* _cur_vm_operation; // Current VM operation
static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations
// Pointer to single-instance of VM thread
static VMThread* _vm_thread;
};
#endif // SHARE_VM_RUNTIME_VMTHREAD_HPP