12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_VM_CODE_ICBUFFER_HPP
25 #define SHARE_VM_CODE_ICBUFFER_HPP
26
27 #include "asm/codeBuffer.hpp"
28 #include "code/stubs.hpp"
29 #include "interpreter/bytecodes.hpp"
30 #include "memory/allocation.hpp"
31 #include "utilities/align.hpp"
32
33 //
34 // For CompiledIC's:
35 //
36 // In cases where we do not have MT-safe state transformation,
37 // we go to a transition state, using ICStubs. At a safepoint,
38 // the inline caches are transferred from the transitional code:
39 //
40 // instruction_address --> 01 set xxx_oop, Ginline_cache_klass
41 // 23 jump_to Gtemp, yyyy
42 // 4 nop
43
44 class ICStub: public Stub {
45 private:
46 int _size; // total size of the stub incl. code
47 address _ic_site; // points at call instruction of owning ic-buffer
48 /* stub code follows here */
49 protected:
50 friend class ICStubInterface;
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12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_VM_CODE_ICBUFFER_HPP
25 #define SHARE_VM_CODE_ICBUFFER_HPP
26
27 #include "asm/codeBuffer.hpp"
28 #include "code/stubs.hpp"
29 #include "interpreter/bytecodes.hpp"
30 #include "memory/allocation.hpp"
31 #include "utilities/align.hpp"
32 #include "utilities/macros.hpp"
33
34 //
35 // For CompiledIC's:
36 //
37 // In cases where we do not have MT-safe state transformation,
38 // we go to a transition state, using ICStubs. At a safepoint,
39 // the inline caches are transferred from the transitional code:
40 //
41 // instruction_address --> 01 set xxx_oop, Ginline_cache_klass
42 // 23 jump_to Gtemp, yyyy
43 // 4 nop
44
45 class ICStub: public Stub {
46 private:
47 int _size; // total size of the stub incl. code
48 address _ic_site; // points at call instruction of owning ic-buffer
49 /* stub code follows here */
50 protected:
51 friend class ICStubInterface;
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82 friend ICStub* ICStub_from_destination_address(address destination_address);
83 };
84
85 // ICStub Creation
86 inline ICStub* ICStub_from_destination_address(address destination_address) {
87 ICStub* stub = (ICStub*) (destination_address - align_up(sizeof(ICStub), CodeEntryAlignment));
88 #ifdef ASSERT
89 stub->verify();
90 #endif
91 return stub;
92 }
93
94 class InlineCacheBuffer: public AllStatic {
95 private:
96 // friends
97 friend class ICStub;
98
99 static int ic_stub_code_size();
100
101 static StubQueue* _buffer;
102 static ICStub* _next_stub;
103
104 static CompiledICHolder* _pending_released;
105 static int _pending_count;
106
107 static StubQueue* buffer() { return _buffer; }
108 static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
109 static ICStub* get_next_stub() { return _next_stub; }
110
111 static void init_next_stub();
112
113 static ICStub* new_ic_stub();
114
115
116 // Machine-dependent implementation of ICBuffer
117 static void assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point);
118 static address ic_buffer_entry_point (address code_begin);
119 static void* ic_buffer_cached_value (address code_begin);
120
121 public:
122
123 // Initialization; must be called before first usage
124 static void initialize();
125
126 // Access
127 static bool contains(address instruction_address);
128
129 // removes the ICStubs after backpatching
130 static void update_inline_caches();
131
132 // for debugging
133 static bool is_empty();
134
135 static void release_pending_icholders();
136 static void queue_for_release(CompiledICHolder* icholder);
137 static int pending_icholder_count() { return _pending_count; }
138
139 // New interface
140 static void create_transition_stub(CompiledIC *ic, void* cached_value, address entry);
141 static address ic_destination_for(CompiledIC *ic);
142 static void* cached_value_for(CompiledIC *ic);
143 };
144
145 #endif // SHARE_VM_CODE_ICBUFFER_HPP
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83 friend ICStub* ICStub_from_destination_address(address destination_address);
84 };
85
86 // ICStub Creation
87 inline ICStub* ICStub_from_destination_address(address destination_address) {
88 ICStub* stub = (ICStub*) (destination_address - align_up(sizeof(ICStub), CodeEntryAlignment));
89 #ifdef ASSERT
90 stub->verify();
91 #endif
92 return stub;
93 }
94
95 class InlineCacheBuffer: public AllStatic {
96 private:
97 // friends
98 friend class ICStub;
99
100 static int ic_stub_code_size();
101
102 static StubQueue* _buffer;
103
104 static CompiledICHolder* _pending_released;
105 static int _pending_count;
106
107 DEBUG_ONLY(static volatile int _needs_refill;)
108
109 static StubQueue* buffer() { return _buffer; }
110
111 static ICStub* new_ic_stub();
112
113 // Machine-dependent implementation of ICBuffer
114 static void assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point);
115 static address ic_buffer_entry_point (address code_begin);
116 static void* ic_buffer_cached_value (address code_begin);
117
118 public:
119
120 // Initialization; must be called before first usage
121 static void initialize();
122
123 // Access
124 static bool contains(address instruction_address);
125
126 // removes the ICStubs after backpatching
127 static void update_inline_caches();
128 static void refill_ic_stubs();
129
130 // for debugging
131 static bool is_empty();
132
133 static void release_pending_icholders();
134 static void queue_for_release(CompiledICHolder* icholder);
135 static int pending_icholder_count() { return _pending_count; }
136
137 // New interface
138 static bool create_transition_stub(CompiledIC *ic, void* cached_value, address entry);
139 static address ic_destination_for(CompiledIC *ic);
140 static void* cached_value_for(CompiledIC *ic);
141 };
142
143 #endif // SHARE_VM_CODE_ICBUFFER_HPP
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