Mercurial > hg > truffle
annotate src/share/vm/adlc/arena.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 // All classes in the virtual machine must be subclassed | |
| 26 // by one of the following allocation classes: | |
| 27 // | |
| 28 // | |
| 29 // For objects allocated in the C-heap (managed by: free & malloc). | |
| 30 // - CHeapObj | |
| 31 // | |
| 32 // | |
| 33 // For embedded objects. | |
| 34 // - ValueObj | |
| 35 // | |
| 36 // For classes used as name spaces. | |
| 37 // - AllStatic | |
| 38 // | |
| 39 | |
| 40 class CHeapObj { | |
| 41 public: | |
| 42 void* operator new(size_t size); | |
| 43 void operator delete(void* p); | |
| 44 void* new_array(size_t size); | |
| 45 }; | |
| 46 | |
| 47 | |
| 48 // Base class for objects used as value objects. | |
| 49 // Calling new or delete will result in fatal error. | |
| 50 | |
| 51 class ValueObj { | |
| 52 public: | |
| 53 void* operator new(size_t size); | |
| 54 void operator delete(void* p); | |
| 55 }; | |
| 56 | |
| 57 // Base class for classes that constitute name spaces. | |
| 58 | |
| 59 class AllStatic { | |
| 60 public: | |
| 61 void* operator new(size_t size); | |
| 62 void operator delete(void* p); | |
| 63 }; | |
| 64 | |
| 65 | |
| 66 //------------------------------Chunk------------------------------------------ | |
| 67 // Linked list of raw memory chunks | |
| 68 class Chunk: public CHeapObj { | |
| 69 public: | |
| 70 void* operator new(size_t size, size_t length); | |
| 71 void operator delete(void* p, size_t length); | |
| 72 Chunk(size_t length); | |
| 73 | |
| 74 enum { | |
| 75 init_size = 1*1024, // Size of first chunk | |
| 76 size = 32*1024 // Default size of an Arena chunk (following the first) | |
| 77 }; | |
| 78 Chunk* _next; // Next Chunk in list | |
| 79 size_t _len; // Size of this Chunk | |
| 80 | |
| 81 void chop(); // Chop this chunk | |
| 82 void next_chop(); // Chop next chunk | |
| 83 | |
| 84 // Boundaries of data area (possibly unused) | |
| 85 char* bottom() const { return ((char*) this) + sizeof(Chunk); } | |
| 86 char* top() const { return bottom() + _len; } | |
| 87 }; | |
| 88 | |
| 89 | |
| 90 //------------------------------Arena------------------------------------------ | |
| 91 // Fast allocation of memory | |
| 92 class Arena: public CHeapObj { | |
| 93 protected: | |
| 94 friend class ResourceMark; | |
| 95 friend class HandleMark; | |
| 96 friend class NoHandleMark; | |
| 97 Chunk *_first; // First chunk | |
| 98 Chunk *_chunk; // current chunk | |
| 99 char *_hwm, *_max; // High water mark and max in current chunk | |
| 100 void* grow(size_t x); // Get a new Chunk of at least size x | |
| 101 size_t _size_in_bytes; // Size of arena (used for memory usage tracing) | |
| 102 public: | |
| 103 Arena(); | |
| 104 Arena(size_t init_size); | |
| 105 Arena(Arena *old); | |
| 106 ~Arena() { _first->chop(); } | |
| 107 char* hwm() const { return _hwm; } | |
| 108 | |
| 109 // Fast allocate in the arena. Common case is: pointer test + increment. | |
| 110 void* Amalloc(size_t x) { | |
| 111 #ifdef _LP64 | |
| 112 x = (x + (8-1)) & ((unsigned)(-8)); | |
| 113 #else | |
| 114 x = (x + (4-1)) & ((unsigned)(-4)); | |
| 115 #endif | |
| 116 if (_hwm + x > _max) { | |
| 117 return grow(x); | |
| 118 } else { | |
| 119 char *old = _hwm; | |
| 120 _hwm += x; | |
| 121 return old; | |
| 122 } | |
| 123 } | |
| 124 // Further assume size is padded out to words | |
| 125 // Warning: in LP64, Amalloc_4 is really Amalloc_8 | |
| 126 void *Amalloc_4(size_t x) { | |
| 127 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
| 128 if (_hwm + x > _max) { | |
| 129 return grow(x); | |
| 130 } else { | |
| 131 char *old = _hwm; | |
| 132 _hwm += x; | |
| 133 return old; | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 // Fast delete in area. Common case is: NOP (except for storage reclaimed) | |
| 138 void Afree(void *ptr, size_t size) { | |
| 139 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; | |
| 140 } | |
| 141 | |
| 142 void *Acalloc( size_t items, size_t x ); | |
| 143 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size ); | |
| 144 | |
| 145 // Reset this Arena to empty, and return this Arenas guts in a new Arena. | |
| 146 Arena *reset(void); | |
| 147 | |
| 148 // Determine if pointer belongs to this Arena or not. | |
| 149 bool contains( const void *ptr ) const; | |
| 150 | |
| 151 // Total of all chunks in use (not thread-safe) | |
| 152 size_t used() const; | |
| 153 | |
| 154 // Total # of bytes used | |
| 155 size_t size_in_bytes() const { return _size_in_bytes; } | |
| 156 void set_size_in_bytes(size_t size) { _size_in_bytes = size; } | |
| 157 }; |