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Object files that depend on each other will cause an unresolved
external. The change lets object files load with unresolved
externals and will resolve them when the object file with the
external is loaded.
A common table of symbol strings and relocation records is maintained.
The symbol string is shared by each object file that is unresolved.
Each relocation record that references the symbol is held. The table
is a series of small blocks that compact as symbols are resolved. The
number of symbols left unresolved is typically small this design avoids
fragmentation of the heap memory.
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The allocator now supports symbols, externals, objects and various memory
attributes when allocating. Provide a clear on allocation, is calloc.
Make the strings in the object files object allocations and not
indirect pointers. This is due to symbols and symbol strings being
allocated in a single blocks per object file. Only externals will be
indirect allocations.
Some trace output changes adding 'rtl'.
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Add indirect pointers and use it for the file names parts which
are part of the object module.
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Add a custom allocator that can be hooked. The default heap allocator
in this code does nothing more than wrap the libc heap allocator.
Fix up the RTL initialise to better handle the locking and
initialisation of internal structures.
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