.ifndef _data_s_file
_data_s_file:

# Format of the info tables:
# - code
# ----- code pointer
# - 8B helper information for eval/apply (generally this is 0, and only gets used for FUN/PAP)
# - 8B pointer to scavenge
# - 8B pointer to evacuate
#
# Evacuate interface:
# in: %rsi continuation, %rbp what to evacuate
# out: %rbp where the thing is now
# Notes:
#  - IND thunks skip themselves on evacuate
#  - checking if whether stuff is already in write region are managed by _gc_evacuate prelude
#
# Scavenge interface:
# in: %rsi continuation, %rbp what to scavenge
# out: %rbp next thing to scavenge in memory
#
# Saved registers by evacuate and scavenge
# - _uskel_gc needs to preserve %rdi now; that might increase
# - scavenges use %r12-%r15
# - %rax-%rdx is scratch and evacuate use

# Simple values and boxed machine integers
# | ptr | value |
INT_evacuate:
	pushq 010(%rbp)
	pushq $INT_code
	mov %rsp,%rbp
	jmp *%rsi
INT_scavenge:
	add $020, %rbp
	jmp *%rsi

INT_info_table:
	cell INT_evacuate
	cell INT_scavenge
	cell 0
INT_code:
	continue

# Indirection
# | ptr | indptr |
IND_evacuate:
	mov 010(%rbp), %rbp
	jmp _gc_evacuate
IND_scavenge:
	jmp 0 # thou shalt not scavenge here

IND_info:
	cell IND_evacuate
	cell IND_scavenge
	cell 0
IND_code:
	enter 010(%rbp)

# List
# | ptr | 0 |           # [] case
# | ptr | 1 | a | b |   # (a:b) case
LIST_evacuate:
	cmpq $0, 010(%rbp)
	je LIST_evacuate_nil
	pushq 030(%rbp)
	pushq 020(%rbp)
	pushq $1
	pushq $LIST_code
	mov %rsp, %rbp
	jmp *%rsi
	LIST_evacuate_nil:
	pushq $0
	pushq $LIST_code
	mov %rsp, %rbp
	jmp *%rsi
LIST_scavenge:
	cmpq $0, 010(%rbp)
	je LIST_scavenge_nil
	mov %rbp, %r15
	mov %rsi, %r14
	
	mov $LIST_scavenge1, %rsi
	mov 020(%r15), %rbp
	jmp _gc_evacuate
	LIST_scavenge1:
	mov %rbp, 020(%r15)

	mov $LIST_scavenge2, %rsi
	mov 030(%r15), %rbp
	jmp _gc_evacuate
	LIST_scavenge2:
	mov %rbp, 030(%r15)

	mov %r15, %rbp
	add $040, %rbp
	jmp *%r14
	LIST_scavenge_nil:
	add $020, %rbp
	jmp *%rsi

LIST_info_table:
	cell LIST_evacuate
	cell LIST_scavenge
	cell 0
LIST_code:
	continue

# FUN objects
# | ptr | thunkptr | args | arg[0] | arg[1] | ... | arg[args] |
FUN_evacuate:
	#TODO
FUN_scavenge:
	#TODO
	#mov 020(%rbp), %rax
	#add $3, %rax
	#shl $3, %rax
	#add %rax, %rsi
	#retq

# Info tables for FUN objects.
FUN0_info_table:
	cell FUN_evacuate
	cell FUN_scavenge
	cell 0
FUN0_code:
	continue

FUN1_info_table:
	cell FUN_evacuate
	cell FUN_scavenge
	cell 1
FUN1_code:
	continue

FUN2_info_table:
	cell FUN_evacuate
	cell FUN_scavenge
	cell 2
FUN2_code:
	continue

FUN3_info_table:
	cell FUN_evacuate
	cell FUN_scavenge
	cell 3
FUN3_code:
	continue

FUN4_info_table:
	cell FUN_evacuate
	cell FUN_scavenge
	cell 4
FUN4_code:
	continue
# add more funN here as needed

# THU objects (gc implementation only, actual THU data are created by functions)
# | ptr | args | arg[0] | arg[1] | ... | arg[args] |
# args wouldn't need to be here but let's keep them for gc simplicity
THU_evacuate:
	mov 010(%rbp), %rbx
	mov %rbx,%rdx
	mov %rbx,%rcx
	add $2, %rdx
	shl $3, %rdx
	add %rbp, %rdx
	THU_evacuate_one:
	dec %rcx
	cmp $0, %rcx
	jl THU_evacuate_fini
	sub $010, %rdx
	pushq (%rdx)
	jmp THU_evacuate_one
	THU_evacuate_fini:
	pushq %rbx
	pushq 000(%rbp)
	mov %rsp, %rbp
	jmp *%rsi
THU_scavenge:
	mov 010(%rbp), %r12
	mov %rbp, %r15
	mov %rsi, %r14
	mov %r12,%r13
	add $2, %r13
	shl $3, %r13
	add %r15, %r13
	THU_scavenge_one:
	sub $010, %r13
	sub $1, %r12
	jl THU_scavenge_fini
	mov (%r13), %rbp
	mov $THU_scavenge_one_cont, %rsi
	jmp _gc_evacuate
	THU_scavenge_one_cont:
	mov %rbp, (%r13)
	jmp THU_scavenge_one

	THU_scavenge_fini:
	mov %r15, %rbp
	mov 010(%rbp), %r13
	add $2, %r13
	shl $3, %r13
	add %r13, %rbp
	jmp *%r14

.endif # _data_s_file