nanojit/Allocator.cpp

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  39
  40 #include "nanojit.h"
  41
  42 #ifdef FEATURE_NANOJIT
  43
  44 namespace nanojit
  45 {
  46     Allocator::Allocator()
  47         : current_chunk(NULL)
  48         , current_top(NULL)
  49         , current_limit(NULL)
  50     { }
  51
  52     Allocator::~Allocator()
  53     {
  54         reset();
  55     }
  56
  57     void Allocator::reset()
  58     {
  59         Chunk *c = current_chunk;
  60         while (c) {
  61             Chunk *prev = c->prev;
  62             freeChunk(c);
  63             c = prev;
  64         }
  65         current_chunk = NULL;
  66         current_top = NULL;
  67         current_limit = NULL;
  68         postReset();
  69     }
  70
  71     void* Allocator::allocSlow(size_t nbytes)
  72     {
  73         NanoAssert((nbytes & 7) == 0);
  74         fill(nbytes);
  75         NanoAssert(current_top + nbytes <= current_limit);
  76         void* p = current_top;
  77         current_top += nbytes;
  78         return p;
  79     }
  80
  81     void Allocator::fill(size_t nbytes)
  82     {
  83         const size_t minChunk = 2000;
  84         if (nbytes < minChunk)
  85             nbytes = minChunk;
  86         size_t chunkbytes = sizeof(Chunk) + nbytes - sizeof(int64_t);
  87         void* mem = allocChunk(chunkbytes);
  88         Chunk* chunk = (Chunk*) mem;
  89         chunk->prev = current_chunk;
  90         current_chunk = chunk;
  91         current_top = (char*)chunk->data;
  92         current_limit = (char*)mem + chunkbytes;
  93     }
  94 }
  95
  96 #endif // FEATURE_NANOJIT