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millfork/docs/lang/predefined_constants.md
Karol Stasiak f676e74e38 Macro improvements: 
– allow local constants in macros
– allow untyped macro parameters with void
– treat the name of a function as a pointer to it
– add this.function local alias (#118)
2021-11-12 02:10:07 +01:00

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Predefined constants

  • byte nullchar – the null terminator for strings in the default encoding, equivalent to ""z[0], can be overriden by the NULLCHAR feature

  • byte nullchar_scr – the null terminator for strings in the screen encoding, equivalent to ""scrz[0], can be overriden by the NULLCHAR_SCR feature

  • null$ nullptr – the invalid pointer value; the value of the NULLPTR feature

  • bool true, bool false – boolean constants

  • pointer segment.N.start – the value of segment_N_start from the platform definition

  • pointer segment.N.codeend – the value of segment_N_codeend from the platform definition

  • pointer segment.N.datastart – the value of segment_N_datastart from the platform definition

  • pointer segment.N.end – the value of segment_N_end from the platform definition

  • pointer segment.N.heapstart – the address of the first byte in the N segment that was not automatically allocated

  • word segment.N.length – the number of byte locations between segment_N_start and segment_N_end, inclusive

  • byte segment.N.bank – the value of segment_N_bank from the platform definition

  • byte segment.N.fill – the value of segment_N_fill from the platform definition

  • this.function – the alias of the current function (in macros, it resolves to the actual non-macro function that called the macro)