hence/henceforth/templates/default.asm

; Generated by Henceforth {{ env!("CARGO_PKG_VERSION") }} ({{ env!("CARGO_PKG_REPOSITORY") }})

.include "$lib/core.asm"
.include "$lib/std.asm"

.define PLACEHOLDER_U8,   CORE_U8_MAX
.define PLACEHOLDER_U16,  CORE_U16_MAX

.define_eval prev, OFFSET
  ts PLACEHOLDER_U16
  tlr CORE_REG_PC
.define_eval diff, (OFFSET - prev)
.define_eval MAIN_JUMPER, (CORE_MEM_PRG_END - diff)
.org prev
.delete prev, diff

.define_eval prev, OFFSET
{%- for c in conditions %}
  .bytes PLACEHOLDER_U16{% if !c.data.1.is_empty() %}, PLACEHOLDER_U16{% endif %}
{%- endfor %}
.define_eval JUMP_TABLE_CONDITIONS_SIZE, (OFFSET - prev)
.org prev
.delete prev

.define_eval JUMP_TABLE_WORDS_SIZE, ({{ words.len() }} * 2)
.define_eval JUMP_TABLE_PTR, (MAIN_JUMPER - JUMP_TABLE_CONDITIONS_SIZE - JUMP_TABLE_WORDS_SIZE)

.debug JUMP_TABLE_CONDITIONS_SIZE, JUMP_TABLE_WORDS_SIZE, (JUMP_TABLE_CONDITIONS_SIZE + JUMP_TABLE_WORDS_SIZE / 2), JUMP_TABLE_PTR

.define_eval counter, 0
; jump table
  ; conditions
{%- for c in conditions %}
  .define_eval jump_table_conditions_if_{{ c.id }}, (JUMP_TABLE_PTR + counter)
  .define_eval counter, (counter + 2)
  {%- if !c.data.1.is_empty() %}
  .define_eval jump_table_conditions_else_{{ c.id }}, (JUMP_TABLE_PTR + counter)
  .define_eval counter, (counter + 2)
  {%- endif %}
{%- endfor %}

  ; words
{%- for w in words %}
  .define_eval jump_table_words_{{ w.id }}, (JUMP_TABLE_PTR + counter)
  .define_eval counter, (counter + 1)
{%- endfor %}
.delete counter

.define_eval MEM_JUMP_TABLE_LEN, (JUMP_TABLE_CONDITIONS_SIZE + JUMP_TABLE_WORDS_SIZE / 2)
.define_eval MEM_JUMP_TABLE_PTR, CORE_MEM_MEM
.define_eval MEM_JUMP_TABLE_END, (MEM_JUMP_TABLE_PTR + MEM_JUMP_TABLE_LEN)

.define_eval MEM_LOOP_DEPTH, (MEM_JUMP_TABLE_END + 1)
.define_eval MEM_LOOP_I, (MEM_LOOP_DEPTH + 1)
.define_eval MEM_LOOP_J, (MEM_LOOP_I + 1)

.define_eval MEM_CALL_STACK_LEN, 16
.define_eval MEM_CALL_STACK_PTR, (MEM_LOOP_J + 1)
.define_eval MEM_CALL_STACK_END, (MEM_CALL_STACK_PTR + MEM_CALL_STACK_LEN)

.define_eval MEM_ALLOC_PTR, (MEM_CALL_STACK_END + 1)

.macro stack_transfer_alu
  .std_ld
  tlr CORE_REG_B
  .std_ld
  tlr CORE_REG_A
.endmacro

.macro jump_table_pull_ptr, jump_table_pull_ptr_arg_0_ptr, jump_table_pull_ptr_arg_1_counter
  ts jump_table_pull_ptr_arg_0_ptr
  tls

  ts 8
  tlr CORE_REG_B
  .std_get jump_table_pull_ptr_arg_0_ptr
  tlr CORE_REG_A
  ts CORE_ALU_LSH
  alu
  tlr CORE_REG_A

  .std_get (jump_table_pull_ptr_arg_0_ptr + 1)
  tlr CORE_REG_B
  ts CORE_ALU_OR
  alu
  tlr CORE_REG_A

  tls
  dbg
  pop
  pop
.endmacro

.define_eval counter, 0
; setup jump table
  ; conditions
  {%- for c in conditions %}
  .jump_table_pull_ptr jump_table_conditions_if_{{ c.id }}, counter
  .define_eval counter, (counter + 1)
  {%- if !c.data.1.is_empty() %}
  .jump_table_pull_ptr jump_table_conditions_else_{{ c.id }}, counter
  .define_eval counter, (counter + 1)
  {%- endif %}
  {%- endfor %}

  ; words
  {%- for w in words %}
  .jump_table_pull_ptr jump_table_words_{{ w.id }}, counter
  .define_eval counter, (counter + 1)
  {%- endfor %}
.delete counter

.delete_macro jump_table_pull_ptr

.macro self_ref, self_ref_arg_0_ptr
  .std_rset CORE_REG_A, self_ref_arg_0_ptr
  .std_set self_ref_arg_0_ptr
.endmacro

; reference MEM_CALL_STACK_PTR to itself
.self_ref MEM_CALL_STACK_PTR

; reference MEM_ALLOC_PTR to itself
.self_ref MEM_ALLOC_PTR

.delete_macro self_ref

.std_jump MAIN_JUMPER

call_stack_jump:
  .std_get MEM_CALL_STACK_PTR
  tlr CORE_REG_A
  .std_rset CORE_REG_B, 1
  .std_alu CORE_ALU_ADD
  tlr CORE_REG_A
  tlr CORE_REG_B
  .std_set MEM_CALL_STACK_PTR

  tsr CORE_REG_D
  tlr CORE_REG_A
  tsr CORE_REG_B
  set
  tsr CORE_REG_C
  tlr CORE_REG_PC

return_call_stack_jump:
  .std_get MEM_CALL_STACK_PTR
  tlr CORE_REG_A
  tlr CORE_REG_C
  .std_rset CORE_REG_B, 1
  .std_alu CORE_ALU_SUB
  tlr CORE_REG_A
  .std_set MEM_CALL_STACK_PTR

  tsr CORE_REG_C
  get
  tlr CORE_REG_PC

.macro call_stack_jump, call_stack_jump_arg_0_label
  .std_rset CORE_REG_C, call_stack_jump_arg_0_label
  .std_rset CORE_REG_D, (OFFSET + 7)
  ts call_stack_jump
  tlr CORE_REG_PC
.endmacro

.macro call_stack_jump_cond_if, call_stack_jump_cond_if_arg_0_if_label
  .std_ld
  tlr CORE_REG_A
  .std_rset CORE_REG_C, call_stack_jump_cond_if_arg_0_if_label
  .std_rset CORE_REG_D, (OFFSET + 7)
  ts call_stack_jump
  tlrc CORE_REG_PC
.endmacro

.define_eval prev, OFFSET
  .std_ld
  tlr CORE_REG_A
  .std_rset CORE_REG_C, PLACEHOLDER_U16
  .std_rset CORE_REG_D, PLACEHOLDER_U16
  ts call_stack_jump
  tlrc CORE_REG_PC

  .std_rset CORE_REG_C, PLACEHOLDER_U16
  .std_rset CORE_REG_D, PLACEHOLDER_U16
  ts call_stack_jump
  tlr CORE_REG_PC
.define_eval CALL_STACK_JUMP_COND_IF_ELSE_SIZE, (OFFSET - prev)
.org prev
.delete prev

.macro call_stack_jump_cond_if_else, call_stack_jump_cond_if_else_arg_0_if_label, call_stack_jump_cond_if_else_arg_1_else_label
  .define_eval prev, OFFSET
  .define offset_till_end, (OFFSET - prev * -1 + CALL_STACK_JUMP_COND_IF_ELSE_SIZE)

  .std_ld
  tlr CORE_REG_A
  .std_rset CORE_REG_C, call_stack_jump_cond_if_else_arg_0_if_label
  .std_rset CORE_REG_D, (OFFSET + offset_till_end)
  ts call_stack_jump
  tlrc CORE_REG_PC

  .std_rset CORE_REG_C, call_stack_jump_cond_if_else_arg_1_else_label
  .std_rset CORE_REG_D, (OFFSET + offset_till_end)
  ts call_stack_jump
  tlr CORE_REG_PC

  .delete prev, offset_till_end
.endmacro

.macro return_call_stack_jump
  .std_jump return_call_stack_jump
.endmacro

; data
  ; strings
  {%- for s in strings %}
    {% let bytes = s.data.as_bytes() -%}
    data_strings_{{ s.id }}:
      {%- for byte in bytes %}
      .bytes {{ "0x{:02x}"|format(byte) }}
      {%- endfor %}
      data_strings_end_{{ s.id }}:
  {% endfor %}

; conditions
{%- for c in conditions %}
  ; condition: {{ c.id }}
    conditions_if_{{ c.id }}:
    {%- for ins in c.data.0 %}
      {{ ins }}
    {%- endfor %}
    .return_call_stack_jump
    {%- if !c.data.1.is_empty() %}

    conditions_else_{{ c.id }}:
    {%- for ins in c.data.1 %}
      {{ ins }}
    {%- endfor %}
    .return_call_stack_jump
    {%- endif %}
{% endfor %}

; words
{%- for w in words %}
  words_{{ w.id }}:
    {%- for node in w.data.1 %}
    {{ node }}
    {%- endfor %}
  .return_call_stack_jump
{% endfor %}

; static jump table
.define_eval prev, OFFSET
  ; conditions
  {%- for c in conditions %}
    ; condition: {{ c.id }}
      .org jump_table_conditions_if_{{ c.id }}
        .bytes conditions_if_{{ c.id }}
      {%- if !c.data.1.is_empty() %}
      .org jump_table_conditions_else_{{ c.id }}
        .bytes conditions_else_{{ c.id }}
      {%- endif %}
  {% endfor %}

  ; words
  {%- for w in words %}
    .org jump_table_words_{{ w.id }}
      .bytes words_{{ w.id }}
  {% endfor %}
.org prev
.delete prev

; main
main:
.org MAIN_JUMPER
  ts main
  tlr CORE_REG_PC

.org main
{%- for node in main %}
  {{ node }}
{%- endfor %}
.std_stop