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
1 /*
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25 #ifndef SHARE_VM_RUNTIME_ATOMIC_HPP
26 #define SHARE_VM_RUNTIME_ATOMIC_HPP
28 #include "memory/allocation.hpp"
30 class Atomic : AllStatic {
31 public:
32 // Atomic operations on jlong types are not available on all 32-bit
33 // platforms. If atomic ops on jlongs are defined here they must only
34 // be used from code that verifies they are available at runtime and
35 // can provide an alternative action if not - see supports_cx8() for
36 // a means to test availability.
38 // Atomically store to a location
39 inline static void store (jbyte store_value, jbyte* dest);
40 inline static void store (jshort store_value, jshort* dest);
41 inline static void store (jint store_value, jint* dest);
42 // See comment above about using jlong atomics on 32-bit platforms
43 inline static void store (jlong store_value, jlong* dest);
44 inline static void store_ptr(intptr_t store_value, intptr_t* dest);
45 inline static void store_ptr(void* store_value, void* dest);
47 inline static void store (jbyte store_value, volatile jbyte* dest);
48 inline static void store (jshort store_value, volatile jshort* dest);
49 inline static void store (jint store_value, volatile jint* dest);
50 // See comment above about using jlong atomics on 32-bit platforms
51 inline static void store (jlong store_value, volatile jlong* dest);
52 inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
53 inline static void store_ptr(void* store_value, volatile void* dest);
55 // See comment above about using jlong atomics on 32-bit platforms
56 inline static jlong load(volatile jlong* src);
58 // Atomically add to a location, return updated value
59 inline static jint add (jint add_value, volatile jint* dest);
60 inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
61 inline static void* add_ptr(intptr_t add_value, volatile void* dest);
62 // See comment above about using jlong atomics on 32-bit platforms
63 static jlong add (jlong add_value, volatile jlong* dest);
65 // Atomically increment location
66 inline static void inc (volatile jint* dest);
67 inline static void inc_ptr(volatile intptr_t* dest);
68 inline static void inc_ptr(volatile void* dest);
70 // Atomically decrement a location
71 inline static void dec (volatile jint* dest);
72 inline static void dec_ptr(volatile intptr_t* dest);
73 inline static void dec_ptr(volatile void* dest);
75 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest.
76 inline static jint xchg(jint exchange_value, volatile jint* dest);
77 static unsigned int xchg(unsigned int exchange_value, volatile unsigned int* dest);
79 inline static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
80 inline static void* xchg_ptr(void* exchange_value, volatile void* dest);
82 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
83 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory
84 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'.
85 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
86 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
87 // See comment above about using jlong atomics on 32-bit platforms
88 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);
90 static unsigned int cmpxchg(unsigned int exchange_value,
91 volatile unsigned int* dest,
92 unsigned int compare_value);
94 inline static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
95 inline static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value);
96 };
98 #endif // SHARE_VM_RUNTIME_ATOMIC_HPP