Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/stackValue.hpp @ 11825:463f51256c86
AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry
for empty methods we emitted something like this if a inline cache is needed:
prefix:
00: < IC check >
...
0b: jne <ic_miss_call>
11: nop
...
verified_entry:
20: ret
ic_miss_call:
21: jmp <entry of runtime function>
when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a
jump to a stub that handles call-sites that has been made non-entrant. since this jump
is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that
calls this method via the unverified entry (prefix).
the fix is to emit the jump to the runtime function inside the unverfied entry:
prefix:
00: < IC check >
...
0b: je <verified_entry>
11: jeq <entry of runtime function>
16: nop
...
verified_entry:
20: ret
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Mon, 30 Sep 2013 09:32:18 +0200 |
parents | f95d63e2154a |
children |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_STACKVALUE_HPP |
26 #define SHARE_VM_RUNTIME_STACKVALUE_HPP | |
27 | |
28 #include "code/location.hpp" | |
29 #include "runtime/handles.hpp" | |
30 #include "utilities/top.hpp" | |
31 | |
0 | 32 class StackValue : public ResourceObj { |
33 private: | |
34 BasicType _type; | |
35 intptr_t _i; // Blank java stack slot value | |
36 Handle _o; // Java stack slot value interpreted as a Handle | |
37 public: | |
38 | |
39 StackValue(intptr_t value) { | |
40 _type = T_INT; | |
41 _i = value; | |
42 } | |
43 | |
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44 StackValue(Handle value, intptr_t scalar_replaced = 0) { |
0 | 45 _type = T_OBJECT; |
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46 _i = scalar_replaced; |
0 | 47 _o = value; |
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48 assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced"); |
0 | 49 } |
50 | |
51 StackValue() { | |
52 _type = T_CONFLICT; | |
53 _i = 0; | |
54 } | |
55 | |
56 // Only used during deopt- preserve object type. | |
57 StackValue(intptr_t o, BasicType t) { | |
58 assert(t == T_OBJECT, "should not be used"); | |
59 _type = t; | |
60 _i = o; | |
61 } | |
62 | |
63 Handle get_obj() const { | |
64 assert(type() == T_OBJECT, "type check"); | |
65 return _o; | |
66 } | |
67 | |
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68 bool obj_is_scalar_replaced() const { |
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69 assert(type() == T_OBJECT, "type check"); |
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70 return _i != 0; |
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71 } |
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72 |
0 | 73 void set_obj(Handle value) { |
74 assert(type() == T_OBJECT, "type check"); | |
75 _o = value; | |
76 } | |
77 | |
78 intptr_t get_int() const { | |
79 assert(type() == T_INT, "type check"); | |
80 return _i; | |
81 } | |
82 | |
83 // For special case in deopt. | |
84 intptr_t get_int(BasicType t) const { | |
85 assert(t == T_OBJECT && type() == T_OBJECT, "type check"); | |
86 return _i; | |
87 } | |
88 | |
89 void set_int(intptr_t value) { | |
90 assert(type() == T_INT, "type check"); | |
91 _i = value; | |
92 } | |
93 | |
94 BasicType type() const { return _type; } | |
95 | |
96 bool equal(StackValue *value) { | |
97 if (_type != value->_type) return false; | |
98 if (_type == T_OBJECT) | |
99 return (_o == value->_o); | |
100 else { | |
101 assert(_type == T_INT, "sanity check"); | |
102 // [phh] compare only low addressed portions of intptr_t slots | |
103 return (*(int *)&_i == *(int *)&value->_i); | |
104 } | |
105 } | |
106 | |
107 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv); | |
108 static BasicLock* resolve_monitor_lock(const frame* fr, Location location); | |
109 | |
110 #ifndef PRODUCT | |
111 public: | |
112 // Printing | |
113 void print_on(outputStream* st) const; | |
114 #endif | |
115 }; | |
1972 | 116 |
117 #endif // SHARE_VM_RUNTIME_STACKVALUE_HPP |