Mercurial > hg > truffle
annotate src/share/vm/runtime/icache.cpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
author | johnc |
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date | Wed, 18 Aug 2010 10:59:06 -0700 |
parents | c18cbe5936b8 |
children | 3e8fbc61cee8 |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_icache.cpp.incl" | |
27 | |
28 // The flush stub function address | |
29 AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL; | |
30 | |
31 void AbstractICache::initialize() { | |
32 // Making this stub must be FIRST use of assembler | |
33 ResourceMark rm; | |
34 | |
35 BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size); | |
36 CodeBuffer c(b->instructions_begin(), b->instructions_size()); | |
37 | |
38 ICacheStubGenerator g(&c); | |
39 g.generate_icache_flush(&_flush_icache_stub); | |
40 | |
41 // The first use of flush_icache_stub must apply it to itself. | |
42 // The StubCodeMark destructor in generate_icache_flush will | |
43 // call Assembler::flush, which in turn will call invalidate_range, | |
44 // which will in turn call the flush stub. Thus we don't need an | |
45 // explicit call to invalidate_range here. This assumption is | |
46 // checked in invalidate_range. | |
47 } | |
48 | |
49 void AbstractICache::call_flush_stub(address start, int lines) { | |
50 // The business with the magic number is just a little security. | |
51 // We cannot call the flush stub when generating the flush stub | |
52 // because it isn't there yet. So, the stub also returns its third | |
53 // parameter. This is a cheap check that the stub was really executed. | |
54 static int magic = 0xbaadbabe; | |
55 | |
56 int auto_magic = magic; // Make a local copy to avoid race condition | |
57 int r = (*_flush_icache_stub)(start, lines, auto_magic); | |
58 guarantee(r == auto_magic, "flush stub routine did not execute"); | |
59 ++magic; | |
60 } | |
61 | |
62 void AbstractICache::invalidate_word(address addr) { | |
63 // Because this is called for instruction patching on the fly, long after | |
64 // bootstrapping, we execute the stub directly. Account for a 4-byte word | |
65 // spanning two cache lines by computing a start line address by rounding | |
66 // addr down to a line_size boundary, and an end line address by adding | |
67 // the word size - 1 and rounding the result down to a line_size boundary. | |
68 // If we just added word size, we'd mistakenly flush the next cache line | |
69 // if the word to be flushed started in the last 4 bytes of the line. | |
70 // Doing that would segv if the next line weren't mapped. | |
71 | |
72 const int word_size_in_bytes = 4; // Always, regardless of platform | |
73 | |
74 intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1); | |
75 intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1) | |
76 & ~(ICache::line_size - 1); | |
77 (*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0); | |
78 } | |
79 | |
80 void AbstractICache::invalidate_range(address start, int nbytes) { | |
81 static bool firstTime = true; | |
82 if (firstTime) { | |
83 guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub), | |
84 "first flush should be for flush stub"); | |
85 firstTime = false; | |
86 return; | |
87 } | |
88 if (nbytes == 0) { | |
89 return; | |
90 } | |
91 // Align start address to an icache line boundary and transform | |
92 // nbytes to an icache line count. | |
93 const uint line_offset = mask_address_bits(start, ICache::line_size-1); | |
94 if (line_offset != 0) { | |
95 start -= line_offset; | |
96 nbytes += line_offset; | |
97 } | |
98 call_flush_stub(start, round_to(nbytes, ICache::line_size) >> | |
99 ICache::log2_line_size); | |
100 } | |
101 | |
102 // For init.cpp | |
103 void icache_init() { | |
104 ICache::initialize(); | |
105 } |