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DEFINITIONS
This source file includes following definitions.
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* The contents of this file are subject to the Mozilla Public License Version
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* The Original Code is [Open Source Virtual Machine].
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* Adobe AS3 Team
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#ifndef __nanojit_Allocator__
#define __nanojit_Allocator__
namespace nanojit
{
/**
* Allocator is a bump-pointer allocator with an SPI for getting more
* memory from embedder-implemented allocator, such as malloc()/free().
*
* allocations never return NULL. The implementation of allocChunk()
* is expected to perform a longjmp or exception when an allocation can't
* proceed.
*/
class Allocator {
public:
Allocator();
~Allocator();
void reset();
/** alloc memory, never return null. */
void* alloc(size_t nbytes) {
nbytes = (nbytes + 7) & ~7; // round up
if (current_top + nbytes <= current_limit) {
void *p = current_top;
current_top += nbytes;
return p;
}
return allocSlow(nbytes);
}
protected:
void* allocSlow(size_t nbytes);
void fill(size_t minbytes);
class Chunk {
public:
Chunk* prev;
int64_t data[1]; // int64_t forces 8-byte alignment.
};
Chunk* current_chunk;
char* current_top;
char* current_limit;
// allocator SPI
/** allocate another block from a host provided allocator */
void* allocChunk(size_t nbytes);
/** free back to the same allocator */
void freeChunk(void*);
/** hook for post-reset action. */
void postReset();
};
}
/** global new overload enabling this pattern: new (allocator) T(...) */
inline void* operator new(size_t size, nanojit::Allocator &a) {
return a.alloc(size);
}
/** global new overload enabling this pattern: new (allocator) T(...) */
inline void* operator new(size_t size, nanojit::Allocator *a) {
return a->alloc(size);
}
/** global new[] overload enabling this pattern: new (allocator) T[] */
inline void* operator new[](size_t size, nanojit::Allocator& a) {
return a.alloc(size);
}
/** global new[] overload enabling this pattern: new (allocator) T[] */
inline void* operator new[](size_t size, nanojit::Allocator* a) {
return a->alloc(size);
}
#endif // __nanojit_Allocator__