Support sjasmplus alias labels

Has a discussion with Ped to how to best solve the problem that the same data area (in assembler) could be used for different purposes. I.e. the example was that a message is received and the contents is differently interpreted depending on the sent message. Ped's proposal was to use STRUCTs and alias labels. See here: https://github.com/z00m128/sjasmplus/blob/master/tests/macro_examples/union_like_structures.asm

    STRUCT RECEIVE_BUFFER_CMD_READ_REGS, RECEIVE_BUFFER_HEADER
register_number     BYTE    0
    ENDS

    STRUCT RECEIVE_BUFFER_CMD_CONTINUE, RECEIVE_BUFFER_HEADER
bp1_enable          BYTE    0
bp1_address         WORD    0
bp2_enable          BYTE    0
bp2_address         WORD    0
    ENDS

    STRUCT RECEIVE_BUFFER_CMD_PED_TEST, RECEIVE_BUFFER_HEADER
pattern             BLOCK   256
    ENDS

; find the structure with maximum size to define how long the receive_buffer should be
RB_MAX_SIZE         = RECEIVE_BUFFER_HEADER
RB_MAX_SIZE         = RB_MAX_SIZE >? RECEIVE_BUFFER_CMD_READ_REGS
RB_MAX_SIZE         = RB_MAX_SIZE >? RECEIVE_BUFFER_CMD_CONTINUE
RB_MAX_SIZE         = RB_MAX_SIZE >? RECEIVE_BUFFER_CMD_PED_TEST

; reserve the memory for the receive_buffer (one buffer for all)
    ORG     $8000
receive_buffer      RECEIVE_BUFFER_HEADER
.data               BLOCK   RB_MAX_SIZE - RECEIVE_BUFFER_HEADER, 0

; definie alias labels for "receive_buffer" to access specific-command fields
rb_read_regs    RECEIVE_BUFFER_CMD_READ_REGS = receive_buffer
rb_continue     RECEIVE_BUFFER_CMD_CONTINUE = receive_buffer
rb_ped_test     RECEIVE_BUFFER_CMD_PED_TEST = receive_buffer

https://github.com/z00m128/sjasmplus/blob/master/tests/macro_examples/union_like_structures.lst


Value    Label
------ - -----------------------------------------------------------
0x0006   RECEIVE_BUFFER_HEADER
0x0000 X RECEIVE_BUFFER_HEADER.length
0x0004 X RECEIVE_BUFFER_HEADER.seq_no
0x0005 X RECEIVE_BUFFER_HEADER.command
0x0007   RECEIVE_BUFFER_CMD_READ_REGS
0x0006 X RECEIVE_BUFFER_CMD_READ_REGS.register_number
0x000C   RECEIVE_BUFFER_CMD_CONTINUE
0x0006 X RECEIVE_BUFFER_CMD_CONTINUE.bp1_enable
0x0007 X RECEIVE_BUFFER_CMD_CONTINUE.bp1_address
0x0009 X RECEIVE_BUFFER_CMD_CONTINUE.bp2_enable
0x000A X RECEIVE_BUFFER_CMD_CONTINUE.bp2_address
0x0106   RECEIVE_BUFFER_CMD_PED_TEST
0x0006 X RECEIVE_BUFFER_CMD_PED_TEST.pattern
0x0106   RB_MAX_SIZE
0x8000   receive_buffer
0x8000 X receive_buffer.length
0x8004 X receive_buffer.seq_no
0x8005   receive_buffer.command
0x8006 X receive_buffer.command.data
0x8000 X rb_read_regs
0x8006   rb_read_regs.register_number
0x8000 X rb_continue
0x8006   rb_continue.bp1_enable
0x8007   rb_continue.bp1_address
0x8009   rb_continue.bp2_enable
0x800A   rb_continue.bp2_address
0x8000 X rb_ped_test
0x8006   rb_ped_test.pattern
0xC000 X process_command
0xC00B   process_command.not_read_regs
0xC01F   process_command.not_continue

This would serve my purpose but DeZog cannot parse this at the moment.

I should extend the parsing also to the labels section.

Or maybe I should not parse the list file anymore but instead the SLD file and the labels file. Should be easier and more complete.

maziac / DeZog

Support sjasmplus alias labels #20