Mercurial > hg > truffle
annotate src/share/vm/runtime/atomic.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 | f95d63e2154a |
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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_atomic.cpp.incl" | |
27 | |
28 jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) { | |
29 assert(sizeof(jbyte) == 1, "assumption."); | |
30 uintptr_t dest_addr = (uintptr_t)dest; | |
31 uintptr_t offset = dest_addr % sizeof(jint); | |
32 volatile jint* dest_int = (volatile jint*)(dest_addr - offset); | |
33 jint cur = *dest_int; | |
34 jbyte* cur_as_bytes = (jbyte*)(&cur); | |
35 jint new_val = cur; | |
36 jbyte* new_val_as_bytes = (jbyte*)(&new_val); | |
37 new_val_as_bytes[offset] = exchange_value; | |
38 while (cur_as_bytes[offset] == compare_value) { | |
39 jint res = cmpxchg(new_val, dest_int, cur); | |
40 if (res == cur) break; | |
41 cur = res; | |
42 new_val = cur; | |
43 new_val_as_bytes[offset] = exchange_value; | |
44 } | |
45 return cur_as_bytes[offset]; | |
46 } | |
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47 |
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48 unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) { |
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49 assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
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50 return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest); |
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51 } |
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52 |
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53 unsigned Atomic::cmpxchg(unsigned int exchange_value, |
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54 volatile unsigned int* dest, unsigned int compare_value) { |
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55 assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
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56 return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest, |
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57 (jint)compare_value); |
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58 } |