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nub31
2025-02-04 11:47:25 +01:00
parent 36cc302d99
commit 774dcfa995
4 changed files with 407 additions and 43 deletions
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130
input/baseline/gc.asm
View File

@@ -1,13 +1,19 @@
global gc_init, gc_alloc global gc_init, gc_alloc
extern alloc, free extern alloc, free, printint, printstr, endl
section .bss section .bss
alloc_list: resq 1 ; head of alloc list alloc_list_head: resq 1
stack_start: resq 1 ; start of stack free_list_head: resq 1
stack_start: resq 1
section .data section .data
gc_threshold_c: dq 1024 ; default of 1024 allocations gc_bytes_allocated: dq 0 ; bytes allocated since the last gc cycle
total_alloc_c: dq 0 ; count the amount of allocations gc_trigger_threshold: dq 1024 * 1024 * 8 ; initial gc trigger threshold in bytes (adjusts dynamically)
gc_start_text: db "Running gc after ", 0
gc_sweep_done_text: db " Sweep done. We no have ", 0
gc_next_threshold: db " The next threshold is ", 0
gc_allocated_bytes: db " allocated bytes", 0
gc_mark_done_text: db " Marking done", 0
section .text section .text
gc_init: gc_init:
@@ -15,30 +21,65 @@ gc_init:
ret ret
gc_alloc: gc_alloc:
add rdi, 24 ; add space for metadata add rdi, 24
mov rdx, [total_alloc_c] ; load total allocation count mov rdx, [gc_bytes_allocated]
cmp rdx, [gc_threshold_c] ; has count exceeded threshold? cmp rdx, [gc_trigger_threshold]
jb .skip_collect ; yes? run gc jb .skip_collect ; if allocated bytes since last collect has exceeded threshold, trigger collect
push rdi push rdi
call gc_collect call gc_collect
pop rdi pop rdi
.skip_collect: .skip_collect:
inc qword [total_alloc_c] ; update total allocation count add [gc_bytes_allocated], rdi
push rdi push rdi
call alloc ; allocate size + metadata call alloc ; allocate size + metadata
pop rdi pop rdi
mov byte [rax], 0 ; set mark to 0 mov byte [rax], 0 ; set mark to 0
mov qword [rax + 8], rdi ; set total size of object (including metadata) mov qword [rax + 8], rdi ; set total size of object (including metadata)
mov rsi, [alloc_list] ; load first item in allocation list mov rsi, [alloc_list_head] ; load first item in allocation list
mov qword [rax + 16], rsi ; make current head of allocation list the next item in this object mov qword [rax + 16], rsi ; make current head of allocation list the next item in this object
mov [alloc_list], rax ; update head of allocation list so it points to this object mov [alloc_list_head], rax ; update head of allocation list so it points to this object
add rax, 24 ; skip metadata for return value add rax, 24 ; skip metadata for return value
ret ret
gc_collect: gc_collect:
mov rdi, gc_start_text
call printstr
mov rdi, [gc_bytes_allocated]
call printint
mov rdi, gc_allocated_bytes
call printstr
call endl
call gc_mark_stack call gc_mark_stack
mov rdi, gc_mark_done_text
call printstr
call endl
call gc_sweep call gc_sweep
mov qword [total_alloc_c], 0 ; reset allocation count
mov rdi, gc_sweep_done_text
call printstr
mov rdi, [gc_bytes_allocated]
call printint
mov rdi, gc_allocated_bytes
call printstr
call endl
mov rdi, [gc_bytes_allocated]
shl rdi, 1
mov rsi, 1024 * 1024 * 8
call max
mov [gc_trigger_threshold], rax
mov qword [gc_bytes_allocated], 0
mov rdi, gc_next_threshold
call printstr
mov rdi, [gc_trigger_threshold]
call printint
mov rdi, gc_allocated_bytes
call printstr
call endl
ret ret
gc_mark_stack: gc_mark_stack:
@@ -57,7 +98,7 @@ gc_mark_stack:
gc_mark: gc_mark:
test rdi, rdi ; is input null? test rdi, rdi ; is input null?
jz .done ; yes? return jz .done ; yes? return
mov rsi, [alloc_list] ; load start of allocation list mov rsi, [alloc_list_head] ; load start of allocation list
.loop: .loop:
test rsi, rsi ; reached end of list? test rsi, rsi ; reached end of list?
jz .done ; yes? return jz .done ; yes? return
@@ -85,32 +126,43 @@ gc_mark:
ret ret
gc_sweep: gc_sweep:
mov rdi, [alloc_list] mov rdi, [alloc_list_head]
xor rsi, rsi xor rsi, rsi
.loop: .loop:
test rdi, rdi ; reached end of list? test rdi, rdi ; reached end of list?
jz .done ; yes? return jz .done ; yes? return
mov al, [rdi] mov al, [rdi]
test al, al ; is object marked? test al, al ; is object marked?
jz .free ; no? free it jz .unmarked ; no? free it
mov byte [rdi], 0 ; yes? clear mark for next marking mov byte [rdi], 0 ; yes? clear mark for next marking
mov rsi, rdi mov rsi, rdi
mov rdi, [rdi + 16] ; load the next object in the list mov rdi, [rdi + 16] ; load the next object in the list
jmp .loop ; repeat jmp .loop ; repeat
.free: .unmarked:
mov rdx, [rdi + 16] ; save address of next object in list mov rdx, [rdi + 16] ; save address of next object in list
test rsi, rsi test rsi, rsi
jz .remove_head jz .remove_head
mov [rsi + 16], rdx ; unlink the current node by setting the previous node's next to the next node's address mov [rsi + 16], rdx ; unlink the current node by setting the previous node's next to the next node's address
jmp .free_memory jmp .free
.remove_head: .remove_head:
mov [alloc_list], rdx ; update head node to be the next node mov [alloc_list_head], rdx ; update head node to be the next node
.free_memory: .free:
push rsi ; save previous node since it will also be the previous node for the next item push rsi ; save previous node since it will also be the previous node for the next item
push rdx ; save next node push rdx ; save next node
call free ; free the memory mov rdx, [rdi + 8] ; load the size of the object
pop rdi ; input for next iteration sub [gc_bytes_allocated], rdx ; adjust allocated bytes
pop rsi ; prev node for next iteration call free ; free the memory
pop rdi ; input for next iteration
pop rsi ; prev node for next iteration
jmp .loop jmp .loop
.done: .done:
ret ret
max:
cmp rdi, rsi
jae .left
mov rax, rsi
ret
.left:
mov rax, rdi
ret

4
input/program.nub
View File

@@ -6,11 +6,9 @@ func main() {
let x = new Human let x = new Human
{ {
name = "test", name = "test",
age = i age = 34958743
}; };
println(x.age);
i = i + 1; i = i + 1;
} }
} }

311
input/util.asm Normal file
View File

@@ -0,0 +1,311 @@
;*********************************************************************
; util.asm
; Version: 1.2
; Author: mjbrusso
; Contributors: AlessandroFonseca
; Licensed under the MIT license (see "license.txt").
;*********************************************************************
global exit, exit0, strlen, atoi, endl, printstr, printint, readstr, readint
SYS_READ: equ 0
SYS_WRITE: equ 1
SYS_EXIT: equ 60
STDIN: equ 0
STDOUT: equ 1
LINEFEED: equ 0x0A
section .text
;*********************************************************************
; void exit(int64 code)
;
; Description:
; Quit program
;
; Arguments:
; rdi: int64 code: Exit code (0=Success, >0=Error)
;
; Returns:
; This function does not return
;
;*********************************************************************
exit:
mov rax, SYS_EXIT ; rax: system call number
syscall
;*********************************************************************
;*********************************************************************
; void exit0()
;
; Description:
; Quit program with status code = 0
;
; Arguments:
; None
;
; Returns:
; This function does not return
;
;*********************************************************************
exit0:
xor rdi, rdi ; rdi = 0
jmp exit ; TCO: tail call optimization
;*********************************************************************
;*********************************************************************
; int64 strlen(char *s)
;
; Description:
; Calculates the length of string ( excluding the terminating null)
;
; Arguments:
; rdi: char *s: address of a null-terminated string (array of chars terminated by 0)
;
; Returns:
; rax: int64: string size
;
;*********************************************************************
strlen:
xor rax, rax ; rax=0; // reset counter
.loop: ; do{
cmp byte [rdi], 0 ; if (*s==0); // If zero, skip loop
je strlen.end ; break;
inc rax ; rax++; // increment counter
inc rdi ; s++; // advance to the next char
jmp strlen.loop ; }while(true);
.end:
ret ; return rax;
;*********************************************************************
;*********************************************************************
; void itoa(int64 value, char *s)
;
; Description:
; Converts an integer to a null-terminated string.
;
; Arguments:
; rdi: int64 value: Integer value to convert.
; rsi: char *s: Memory address where to store the resulting string.
;
; Returns:
; rax: int64: string size
;
;*********************************************************************
itoa:
test rdi, rdi ; value = rdi
jz itoa.iszero ; value==0 has a direct solution
jns itoa.notneg ; if(value <0 )
mov byte [rsi], '-' ; *s = '-'
neg rdi ; value = -value
inc rsi ; s++
.notneg:
mov r9b, 1 ; bool leftzero=true
mov r10, 10 ; base = 10
mov rcx, 1000000000000000000 ; divisor = 1000000000000000000
mov r8, 19 ; cont = 19 // Will repeat 19 times
.loop: ; do{
mov rax, rdi ; dividend[0..31] = value
xor rdx, rdx ; dividend[32..63] = 0
idiv rcx ; rax=(rdx:rax)/rcx ; rdx=(rdx:rax)%rcx
test al, al ; digit = rax[0..7]
jnz itoa.notdigit0 ; if(digit!=0)
test r9b, r9b ; if(leftzero)
jnz itoa.nextdigit ; continue
jmp itoa.digit0
.notdigit0:
xor r9b, r9b ; leftzero = false
.digit0:
add eax, 48 ; digit = '0' + digit
mov rdi, rdx ; value %= divisor
mov byte [rsi], al ; *p = digit
inc rsi ; p++
.nextdigit:
mov rax, rcx ; dividend[0..31] = value
xor rdx, rdx ; dividend[32..63] = 0
idiv r10 ; rax=(rdx:rax)/10 ; rdx=(rdx:rax)%10
mov rcx, rax ; divisor /= 10
dec r8 ; cont--
jne itoa.loop ; }while(cont!=0)
.end:
mov byte [rsi], 0 ; *p = '\0'
ret
.iszero:
mov word [rsi], 0x0030 ; *p = "0" (x86 is little endian)
ret
;*********************************************************************
;*********************************************************************
; int64 atoi(char *s)
;
; Description:
; Convert string to integer.
;
; Arguments:
; rdi: char *s: Address of a null-terminated string (array of chars terminated by 0)
;
; Returns:
; rax: int64: integer value
;*********************************************************************
atoi:
push r12 ; r12 is callee saved
mov r12, rdi ; rdi is caller saved
call strlen
lea rdi, [r12+rax-1] ; char *p = &s[strlen(string)]; //scans string backward
xor rax, rax ; result value
mov rdx, 1 ; multiplier
.beginloop:
cmp rdi, r12 ; while(p>=s){
jl atoi.end ;
xor rcx, rcx ;
mov cl, byte [rdi] ; cl = current char
cmp cl, '-' ; if(cl=='-')
jne atoi.notneg ;
neg rax ; rax=-rax
jmp atoi.end ;
.notneg:
cmp cl, '9' ; if(!isdigit(cl)) nextdigit
jg atoi.endloop ;
sub cl, '0' ;
jl atoi.endloop ;
imul rcx, rdx ; digit_value = current_char * multiplier
add rax, rcx ; result += digit_value
imul rdx, 10 ; multiplier *= 10
.endloop:
dec rdi ; previous char //scans string backward
jmp atoi.beginloop ; }
.end:
pop r12 ; restore r12
ret
;*********************************************************************
;*********************************************************************
; void endl()
;
; Description:
; Prints a newline (line break)
;
; Arguments:
; None
;
; Returns:
; Nothing
;
;*********************************************************************
endl:
lea rdi, [endl.str] ; print the string
call printstr
ret
;*********************************************************************
;*********************************************************************
; void printstr(char *s)
;
; Description:
; Print a string
;
; Arguments:
; rdi: char *s: address of a null-terminated string (array of chars terminated by 0)
;
; Returns:
; Nothing
;
;*********************************************************************
printstr:
push r15 ; r15 is callee saved
mov r15, rdi ; save copy (rdi should be caller saved)
call strlen
mov rdx, rax ; string size
mov rsi, r15 ; string
mov rax, SYS_WRITE ; system call number
mov rdi, STDOUT ; file descriptor
syscall ; system call
pop r15
ret
;*********************************************************************
;*********************************************************************
; void printint(int64 n)
;
; Description:
; Print integer number (decimal)
;
; Arguments:
; rdi: int64 n: Value to print
;
; Returns:
; Nothing
;
;*********************************************************************
printint:
sub rsp, 40 ; stack allocate a temp string
mov rsi, rsp ; rdi=value, rsi=&str[0]
call itoa
mov rdi, rsp ; rdi=&str[0]
call printstr ; print number
add rsp, 40 ; deallocate the string
ret
;*********************************************************************
;*********************************************************************
; int64 readstr(char *s, int64 maxsize)
;
; Description:
; Read up to *maxsize* chars from standard input into a string.
;
; Arguments:
; rdi: char *s: address of a string (array of chars)
; rsi: int64 maxsize: input size limit
;
; Returns:
; rax: int64: Number of characters read
;
;*********************************************************************
readstr:
mov r8, rdi ; copy of buffer address
mov rax, SYS_READ ; system call number
mov rdx, rsi ; pointer to buffer
mov rsi, rdi ; max size
mov rdi, STDIN ; file descriptor
syscall ; system call
dec rax ; removing trailing newline char
mov byte [r8+rax], 0 ; replace with '\0'
ret
;*********************************************************************
;*********************************************************************
; int64 readint()
;
; Description:
; Read int64 from standard input
;
; Arguments:
; None
;
; Returns:
; rax: int64: The value entered
;
;*********************************************************************
readint:
sub rsp, 40 ; char s[40]
mov rdi, rsp ; rdi = &s[0]
mov rsi, 21 ; max input size
call readstr ; read number as string
mov rdi, rsp ;
call atoi ; rax = atoi(s)
add rsp, 40 ; deallocate s from stack
ret
;*********************************************************************
section .data
endl.str: db LINEFEED, 0

5
output/build.sh
View File

@@ -13,4 +13,7 @@ nasm -g -felf64 ../input/core/itoa.asm -o itoa.o
# program # program
nasm -g -felf64 out.asm -o out.o nasm -g -felf64 out.asm -o out.o
ld -o out str_len.o arr_size.o itoa.o alloc.o gc.o str_cmp.o out.o # tmp
nasm -g -felf64 ../input/util.asm -o util.o
ld -o out out.o gc.o alloc.o str_cmp.o str_len.o arr_size.o itoa.o util.o