Mercurial > hg > truffle
annotate src/share/vm/services/memoryUsage.hpp @ 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 |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 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 // A memory usage contains the following attributes about memory usage: | |
| 26 // initSize - represents the initial amount of memory (in bytes) that | |
| 27 // the Java virtual machine requests from the operating system | |
| 28 // for memory management. The Java virtual machine may request | |
| 29 // additional memory from the operating system later when appropriate. | |
| 30 // Its value may be undefined. | |
| 31 // used - represents the amount of memory currently used (in bytes). | |
| 32 // committed - represents the amount of memory (in bytes) that is | |
| 33 // guaranteed to be available for use by the Java virtual machine. | |
| 34 // The amount of committed memory may change over time (increase | |
| 35 // or decrease). It is guaranteed to be greater than or equal | |
| 36 // to initSize. | |
| 37 // maxSize - represents the maximum amount of memory (in bytes) | |
| 38 // that can be used for memory management. The maximum amount of | |
| 39 // memory for memory management could be less than the amount of | |
| 40 // committed memory. Its value may be undefined. | |
| 41 | |
| 42 class MemoryUsage VALUE_OBJ_CLASS_SPEC { | |
| 43 private: | |
| 44 size_t _initSize; | |
| 45 size_t _used; | |
| 46 size_t _committed; | |
| 47 size_t _maxSize; | |
| 48 | |
| 49 public: | |
| 50 // Constructors | |
| 51 MemoryUsage(size_t i, size_t u, size_t c, size_t m) : | |
| 52 _initSize(i), _used(u), _committed(c), _maxSize(m) {}; | |
| 53 MemoryUsage() : | |
| 54 _initSize(0), _used(0), _committed(0), _maxSize(0) {}; | |
| 55 | |
| 56 size_t init_size() const { return _initSize; } | |
| 57 size_t used() const { return _used; } | |
| 58 size_t committed() const { return _committed; } | |
| 59 size_t max_size() const { return _maxSize; } | |
| 60 | |
| 61 inline static jlong convert_to_jlong(size_t val) { | |
| 62 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). | |
| 63 jlong ret; | |
| 64 if (val == (size_t)-1) { | |
| 65 ret = -1L; | |
| 66 } else { | |
| 67 NOT_LP64(ret = val;) | |
| 68 LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);) | |
| 69 } | |
| 70 return ret; | |
| 71 } | |
| 72 | |
| 73 jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); } | |
| 74 jlong used_as_jlong() const { return convert_to_jlong(_used); } | |
| 75 jlong committed_as_jlong() const { return convert_to_jlong(_committed); } | |
| 76 jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); } | |
| 77 }; |