8 lines
3.5 KiB
Plaintext
8 lines
3.5 KiB
Plaintext
February, 1989
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Movement of Guaranteed Type Numbers,
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Addition of hashing MISCN subops.
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Summary
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The type numbers of several Lisp datatypes were moved down into the range that is "known to the microcode," to allow me to write C support for hashing.
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Overview
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Certain lisp type numbers must be known to the underlying implementation (microcode on 1186's, the C emulator on Suns). One obvious example is that the emulator must be able to detect SMALLPs, so it can do arithmetic quickly.
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There is a range of type numbers that are allocated very early in the load-up process, so that they are assigned known numbers. After those "well-known" types, the type numbers for hunked storage are allocated. After that, type numbers are allocated to types as the loadup progresses, in whatever order they are defined.
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The New Requirement
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I implemented MISCN sub-opcodes for CL:SXHASH, CL::EQLHASHBITSFN, IL:STRINGHASHBITS, and IL:STRING-EQUAL-HASHBITS. CL:SXHASH has special-case code for several data types that were not in the "well-known" range: RATIONAL, COMPLEX, PATHNAME, and BIGNUM. I needed to move the type numbers for those types down.
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The New "Well-Known" Type Numbers
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The well-known type numbers are defined from the list \BUILD-IN-SYSTEM-TYPES, which is defined in the file LLDATATYPE. Listed below are the old and new type number assignments:
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Pre-existing Newly-Added
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1 SMALLP
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2 FIXP
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3 FLOATP
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4 LITATOM
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5 LISTP
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6 ARRAYP
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7 STRINGP
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8 STACKP
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9 CHARACTER
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10 VMEMPAGEP
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11 STREAM
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12 BITMAP
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13 COMPILED-CLOSURE
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14 ONED-ARRAY
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15 TWOD-ARRAY
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16 GENERAL-ARRAY
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17 BIGNUM
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18 RATIO
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19 COMPLEX
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20 PATHNAME
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Changes to the C emulator
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Moving those four types into the well-known range had the effect of moving the array hunk type numbers up. The C coded garbage collector had several hunk type numbers hard-coded into it (as hex constants!!). I added definitions for all the type numbers in use (both well-known and hunk) to LISPTYPES.H, and changed the GC code (in GCRECLAIMCELL.C, as I recall) to accomodate it.
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The new hashing MISCN sub-opcodes
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The source for the new opcodes is in sxhash.c. The document {Eris}<Lispcore>Internal>Doc>Opcodes.TEdit has been updated to reflect their addition. I have also reserved opcodes for CL:VALUES and CL:VALUES-LIST.
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The Lisp definitions for the functions CL:SXHASH, CL::EQLHASHBITSFN, IL:STRINGHASHBITS, AND IL:STRING-EQUAL-HASHBITS are now written to use the MISCN sub-opcode appropriate; the UFNs are defined in the same files as the original functions, CMLHASH and LLARRAYELT. 2 <01> <00> 2 <01> <00> 2 <01> <00> 2 H <00> <00> 2 <00> <00> <00> 2 H H Z MODERN MODERN MODERN MODERN
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MODERN
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G <00> <00> C 7 " <00>
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} " <00> <09> Iz<49> |