Mon, 18 Mar 2013 13:19:06 +0100
8008555: Debugging code in compiled method sometimes leaks memory
Summary: support for strings that have same life-time as code that uses them.
Reviewed-by: kvn, twisti
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25 #ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP
26 #define SHARE_VM_RUNTIME_BASICLOCK_HPP
28 #include "oops/markOop.hpp"
29 #include "runtime/handles.hpp"
30 #include "utilities/top.hpp"
32 class BasicLock VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 private:
35 volatile markOop _displaced_header;
36 public:
37 markOop displaced_header() const { return _displaced_header; }
38 void set_displaced_header(markOop header) { _displaced_header = header; }
40 void print_on(outputStream* st) const;
42 // move a basic lock (used during deoptimization
43 void move_to(oop obj, BasicLock* dest);
45 static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); }
46 };
48 // A BasicObjectLock associates a specific Java object with a BasicLock.
49 // It is currently embedded in an interpreter frame.
51 // Because some machines have alignment restrictions on the control stack,
52 // the actual space allocated by the interpreter may include padding words
53 // after the end of the BasicObjectLock. Also, in order to guarantee
54 // alignment of the embedded BasicLock objects on such machines, we
55 // put the embedded BasicLock at the beginning of the struct.
57 class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
58 friend class VMStructs;
59 private:
60 BasicLock _lock; // the lock, must be double word aligned
61 oop _obj; // object holds the lock;
63 public:
64 // Manipulation
65 oop obj() const { return _obj; }
66 void set_obj(oop obj) { _obj = obj; }
67 BasicLock* lock() { return &_lock; }
69 // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
70 // in interpreter activation frames since it includes machine-specific padding.
71 static int size() { return sizeof(BasicObjectLock)/wordSize; }
73 // GC support
74 void oops_do(OopClosure* f) { f->do_oop(&_obj); }
76 static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); }
77 static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); }
78 };
81 #endif // SHARE_VM_RUNTIME_BASICLOCK_HPP