Mercurial > hg > truffle
annotate src/share/vm/prims/jniFastGetField.hpp @ 3229:4a6bda6cfe28
Fix for usages that are phi in rematerialization
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Thu, 21 Jul 2011 11:32:22 +0200 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
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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_PRIMS_JNIFASTGETFIELD_HPP |
26 #define SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "prims/jvm_misc.hpp" | |
30 | |
0 | 31 // Basic logic of a fast version of jni_Get<Primitive>Field: |
32 // | |
33 // (See safepoint.hpp for a description of _safepoint_counter) | |
34 // | |
35 // load _safepoint_counter into old_counter | |
36 // IF old_counter is odd THEN | |
37 // a safepoint is going on, return jni_GetXXXField | |
38 // ELSE | |
39 // load the primitive field value into result (speculatively) | |
40 // load _safepoint_counter into new_counter | |
41 // IF (old_counter == new_counter) THEN | |
42 // no safepoint happened during the field access, return result | |
43 // ELSE | |
44 // a safepoint might have happened in-between, return jni_GetXXXField() | |
45 // ENDIF | |
46 // ENDIF | |
47 // | |
48 // LoadLoad membars to maintain the load order may be necessary | |
49 // for some platforms. | |
50 // | |
51 // The fast versions don't check for pending suspension request. | |
52 // This is fine since it's totally read-only and doesn't create new race. | |
53 // | |
54 // There is a hypothetical safepoint counter wraparound. But it's not | |
55 // a practical concern. | |
56 | |
57 class JNI_FastGetField : AllStatic { | |
58 private: | |
59 enum { LIST_CAPACITY = 40 }; // a conservative number for the number of | |
60 // speculative loads on all the platforms | |
61 static address speculative_load_pclist []; | |
62 static address slowcase_entry_pclist []; | |
63 static int count; | |
64 | |
65 static address generate_fast_get_int_field0(BasicType type); | |
66 static address generate_fast_get_float_field0(BasicType type); | |
67 | |
68 public: | |
69 #if defined(_WINDOWS) && !defined(_WIN64) | |
70 static GetBooleanField_t jni_fast_GetBooleanField_fp; | |
71 static GetByteField_t jni_fast_GetByteField_fp; | |
72 static GetCharField_t jni_fast_GetCharField_fp; | |
73 static GetShortField_t jni_fast_GetShortField_fp; | |
74 static GetIntField_t jni_fast_GetIntField_fp; | |
75 static GetLongField_t jni_fast_GetLongField_fp; | |
76 static GetFloatField_t jni_fast_GetFloatField_fp; | |
77 static GetDoubleField_t jni_fast_GetDoubleField_fp; | |
78 #endif | |
79 | |
80 static address generate_fast_get_boolean_field(); | |
81 static address generate_fast_get_byte_field(); | |
82 static address generate_fast_get_char_field(); | |
83 static address generate_fast_get_short_field(); | |
84 static address generate_fast_get_int_field(); | |
85 static address generate_fast_get_long_field(); | |
86 static address generate_fast_get_float_field(); | |
87 static address generate_fast_get_double_field(); | |
88 | |
89 // If pc is in speculative_load_pclist, return the corresponding | |
90 // slow case entry pc. Otherwise, return -1. | |
91 // This is used by signal/exception handler to handle such case: | |
92 // After an even safepoint counter is loaded and a fast field access | |
93 // is about to begin, a GC kicks in and shrinks the heap. Then the | |
94 // field access may fault. The signal/exception handler needs to | |
95 // return to the slow case. | |
96 // | |
97 // The GC may decide to temporarily stuff some bad values into handles, | |
98 // for example, for debugging purpose, in which case we need the mapping also. | |
99 static address find_slowcase_pc(address pc); | |
100 }; | |
1972 | 101 |
102 #endif // SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP |