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09fbfb1905
The motivation for this is that allocating and clearing symbol tables is a common operation, especially with C99+, where a construct like "if (...) { ... }" involves three levels of scope with their own symbol tables. In some tests, it could take an appreciable fraction of total execution time (sometimes ~10%).
This patch allows symbol tables that have already been allocated and cleared to be reused for a subsequent scope, as long as they are still empty. It does this by maintaining a pool of empty symbol tables and taking one from there rather than allocating a new one when possible.
We impose a somewhat arbitrary limit of MaxBlock/150000 on the number of symbol tables we keep, to avoid filling up memory with them. It would probably be better to use purgeable handles here, but that would be a little more work, and this should be good enough for now.
42 lines
1.0 KiB
NASM
42 lines
1.0 KiB
NASM
mcopy symbol.macros
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****************************************************************
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*
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* ClearTable - set the symbol table to zeros
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*
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* Inputs:
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* table - symbol table address
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*
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****************************************************************
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*
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ClearTable private cc
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hashSize2 equ 1753 # hash buckets * 2 - 1
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sizeofBuckets equ 4*(hashSize2+1) sizeof(symbolTable.buckets)
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subroutine (4:table),0
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ldy #sizeofBuckets-2
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lda #0
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lb1 sta [table],Y
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dey
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dey
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bpl lb1
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return
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end
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****************************************************************
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*
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* SaveBF - save a value to a bit-field
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*
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* Inputs:
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* addr - address to copy to
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* bitdisp - displacement past the address
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* bitsize - number of bits
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* val - value to copy
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*
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****************************************************************
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*
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SaveBF private cc
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jml ~SaveBF call ~SaveBF in ORCALib
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end
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