Mercurial > hg > truffle
annotate src/share/vm/runtime/icache.hpp @ 1616:38e8278318ca
6656830: assert((*p)->is_oop(),"expected an oop while scanning weak refs")
Reviewed-by: dcubed, kvn, twisti
author | never |
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date | Mon, 21 Jun 2010 14:26:17 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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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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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // Interface for updating the instruction cache. Whenever the VM modifies | |
26 // code, part of the processor instruction cache potentially has to be flushed. | |
27 | |
28 // Default implementation is in icache.cpp, and can be hidden per-platform. | |
29 // Most platforms must provide only ICacheStubGenerator::generate_icache_flush(). | |
30 // Platforms that don't require icache flushing can just nullify the public | |
31 // members of AbstractICache in their ICache class. AbstractICache should never | |
32 // be referenced other than by deriving the ICache class from it. | |
33 // | |
34 // The code for the ICache class and for generate_icache_flush() must be in | |
35 // architecture-specific files, i.e., icache_<arch>.hpp/.cpp | |
36 | |
37 class AbstractICache : AllStatic { | |
38 public: | |
39 // The flush stub signature | |
40 typedef int (*flush_icache_stub_t)(address addr, int lines, int magic); | |
41 | |
42 protected: | |
43 // The flush stub function address | |
44 static flush_icache_stub_t _flush_icache_stub; | |
45 | |
46 // Call the flush stub | |
47 static void call_flush_stub(address start, int lines); | |
48 | |
49 public: | |
50 enum { | |
51 stub_size = 0, // Size of the icache flush stub in bytes | |
52 line_size = 0, // Icache line size in bytes | |
53 log2_line_size = 0 // log2(line_size) | |
54 }; | |
55 | |
56 static void initialize(); | |
57 static void invalidate_word(address addr); | |
58 static void invalidate_range(address start, int nbytes); | |
59 }; | |
60 | |
61 | |
62 // Must be included before the definition of ICacheStubGenerator | |
63 // because ICacheStubGenerator uses ICache definitions. | |
64 | |
65 #include "incls/_icache_pd.hpp.incl" | |
66 | |
67 | |
68 class ICacheStubGenerator : public StubCodeGenerator { | |
69 public: | |
70 ICacheStubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {} | |
71 | |
72 // Generate the icache flush stub. | |
73 // | |
74 // Since we cannot flush the cache when this stub is generated, | |
75 // it must be generated first, and just to be sure, we do extra | |
76 // work to allow a check that these instructions got executed. | |
77 // | |
78 // The flush stub has three parameters (see flush_icache_stub_t). | |
79 // | |
80 // addr - Start address, must be aligned at log2_line_size | |
81 // lines - Number of line_size icache lines to flush | |
82 // magic - Magic number copied to result register to make sure | |
83 // the stub executed properly | |
84 // | |
85 // A template for generate_icache_flush is | |
86 // | |
87 // #define __ _masm-> | |
88 // | |
89 // void ICacheStubGenerator::generate_icache_flush( | |
90 // ICache::flush_icache_stub_t* flush_icache_stub | |
91 // ) { | |
92 // StubCodeMark mark(this, "ICache", "flush_icache_stub"); | |
93 // | |
94 // address start = __ pc(); | |
95 // | |
96 // // emit flush stub asm code | |
97 // | |
98 // // Must be set here so StubCodeMark destructor can call the flush stub. | |
99 // *flush_icache_stub = (ICache::flush_icache_stub_t)start; | |
100 // }; | |
101 // | |
102 // #undef __ | |
103 // | |
104 // The first use of flush_icache_stub must apply it to itself. The | |
105 // StubCodeMark destructor in generate_icache_flush will call Assembler::flush, | |
106 // which in turn will call invalidate_range (see asm/assembler.cpp), which | |
107 // in turn will call the flush stub *before* generate_icache_flush returns. | |
108 // The usual method of having generate_icache_flush return the address of the | |
109 // stub to its caller, which would then, e.g., store that address in | |
110 // flush_icache_stub, won't work. generate_icache_flush must itself set | |
111 // flush_icache_stub to the address of the stub it generates before | |
112 // the StubCodeMark destructor is invoked. | |
113 | |
114 void generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub); | |
115 }; |