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qdosmsq:sbinternal:nametab [2009/02/10 14:58] (current)
george.gwilt created
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 +====== SuperBASIC Name Table ======
 +The Name Table consists of a set of eight bytes each in the following form.
 +The first word is a code giving the Type. This is followed by another word which is the offset from the start of the Name List to the associated name, or -1 if there is no associated name, which is the case for an expression and a substring. Finally there is a long word containing a value pointer which can be one of four things.
 +  * Offset into the variables area (vv).
 +  * Pointer to the maths stack (ms).
 +  * SuperBASIC line number held in the high word (ln).
 +  * Absolute address (ab).
 +^Type ^Meaning^ Value pointer^
 +|$0001|Unset string|vv|
 +|$0002|Unset fp|vv|
 +|$0003|Unset integer|vv|
 +|$0101|String expression|ms|
 +|$0102|Fp expression|ms|
 +|$0103|Integer expression|ms|
 +|$0202|Fp number|vv|
 +|$0301|String array|vv|
 +|$0302|Fp array|vv|
 +|$0303|Integer array|vv|
 +|$0400|SuperBASIC procedure|ln|
 +|$0501|SuperBASIC string function|ln|
 +|$0502|SuperBASIC fp function|ln|
 +|$0503|SuperBASIC integer function|ln|
 +|$0602|REPeat loop index|vv|
 +|$0702|FOR loop index|vv| ​
 +|$0800|Machine code procedure|ab|
 +|$0900|Machine code function|ab|
 +==== Parameters ====
 +When a machine code routine is called the parameters are put into the Name Table. In this case the Type code contains information about the parameters.
 +Bit 7 is set if the parameter is preceded by # (hash).
 +Bits 4 to 6 contain the Separator type and bits 0 to 3 contain the Type of item.
 +^Bits 4 to 6^Separator^Bits 0 to 3^Type^
 +|%010|;​|%0010|Floating Point|
 +|%100|!| | |
 +|%101|TO| | |
  • qdosmsq/sbinternal/nametab.txt
  • Last modified: 2009/02/10 14:58
  • by george.gwilt