705 lines
15 KiB
NASM
705 lines
15 KiB
NASM
section .text
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extern panic
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extern strlen
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extern strcmp
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extern streq
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extern memcpy
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extern eprint_str
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extern exit
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extern error_to_str
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extern eprint_error
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extern alloc_pages
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extern allocate
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extern fopen_read
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extern is_alpha
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extern is_numeric
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extern is_id_continue
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extern is_id_start
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extern is_whitespace
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global tokeniser_init
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global tokeniser_print
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global find_lexeme
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;; =============================
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;; Tokeniser functions
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;; =============================
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;; tokeniser state
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section .data
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global input_file
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global buffer
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global cursor
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global buffer_len
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input_file dd 0
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buffer dq 0
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cursor dq 0
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buffer_len dq 0
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;; each buffer is chunk_size bytes large
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;; buffer header structure:
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;; +0 (8 bytes): pointer buffer
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;; +8 (8 bytes): size of buffer
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;; Tokens:
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;; [let, if, else, fn, return, loop, break, continue, true, false, i32, u32, bool, =, +, -, *, /, %, ==, !=, <, <=, >, >=, &&, ||, !, (, ), {, }, [, ], ;, ',', ]
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section .bss
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statbuf: resb 144
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section .text
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;; Initialises the tokeniser
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;; rdx: pointer to filename (null-terminated)
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tokeniser_init:
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; open file for reading
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; this panics if the file doesn't exist
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call fopen_read
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mov dword [rel input_file], eax ; store file descriptor
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mov qword [rel cursor], 0
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mov qword [rel buffer_len], 0
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; fstat
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mov rax, 5 ; syscall: fstat
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mov rdi, [rel input_file] ; fd
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lea rsi, [rel statbuf] ; statbuf
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syscall
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cmp rax, 0
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jl .report_error
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; get file size from statbuf
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lea r15, [rel statbuf] ; st_size
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mov r15, [r15 + 48] ; offset of st_size in stat struct
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; allocate buffer
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mov rdi, r15
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call allocate
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mov qword [rel buffer], rax
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mov qword [rel buffer_len], r15
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; read file into buffer
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mov rax, 0 ; syscall: read
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mov edi, [rel input_file] ; fd
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mov rsi, [rel buffer] ; buf
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mov rdx, [rel buffer_len] ; count
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syscall
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cmp rax, 0
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jl .report_error
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ret
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.report_error:
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mov rcx, rax
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call eprint_error
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call panic
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section .rdata
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tokeniser_buffer db "Tokeniser buffer: ", 10
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tokeniser_buffer_len equ $ - tokeniser_buffer
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section .text
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tokeniser_print:
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lea rdi, [rel tokeniser_buffer]
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mov rsi, tokeniser_buffer_len
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call eprint_str
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mov rax, [rel cursor]
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mov rdi, [rel buffer]
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add rdi, rax
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mov rsi, [rel buffer_len]
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call eprint_str
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ret
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section .rdata
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global LEXEMES
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global TOKENS
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global LEXEME_LENS
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global NUM_LEXEMES
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align 8
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LEXEMES:
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dq LEX_NOT_A_LEXEME
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dq LEX_LET
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dq LEX_IF
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dq LEX_ELSE
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dq LEX_FN
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dq LEX_RETURN
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dq LEX_LOOP
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dq LEX_BREAK
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dq LEX_CONTINUE
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dq LEX_TRUE
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dq LEX_FALSE
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dq LEX_BOOL
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dq LEX_ARROW
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dq LEX_I32
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dq LEX_U32
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dq LEX_EQUALS
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dq LEX_PLUS
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dq LEX_MINUS
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dq LEX_RPARENS
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dq LEX_LPARENS
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dq LEX_RBRACE
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dq LEX_LBRACE
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dq LEX_COLON
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dq LEX_SEMI
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dq LEX_COMMA
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dq LEX_PIPE
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dq LEX_AMP
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dq LEX_EQEQ
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dq LEX_LBRACKET
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dq LEX_RBRACKET
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align 8
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TOKENS:
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db TOKEN_EOF ;; 0
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db TOKEN_LET ;; 1
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db TOKEN_IF ;; 2
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db TOKEN_ELSE ;; 3
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db TOKEN_FN ;; 4
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db TOKEN_RETURN ;; 5
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db TOKEN_LOOP ;; 6
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db TOKEN_BREAK ;; 7
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db TOKEN_CONTINUE ;; 8
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db TOKEN_TRUE ;; 9
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db TOKEN_FALSE ;; 10
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db TOKEN_BOOL ;; 11
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db TOKEN_ARROW ;; 12
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db TOKEN_I32 ;; 13
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db TOKEN_U32 ;; 14
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db TOKEN_EQUALS ;; 15
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db TOKEN_PLUS ;; 16
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db TOKEN_MINUS ;; 17
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db TOKEN_RPARENS ;; 18
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db TOKEN_LPARENS ;; 19
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db TOKEN_RBRACE ;; 20
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db TOKEN_LBRACE ;; 21
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db TOKEN_COLON ;; 22
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db TOKEN_SEMI ;; 23
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db TOKEN_COMMA ;; 24
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db TOKEN_PIPE ;; 25
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db TOKEN_AMP ;; 26
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db TOKEN_EQEQ ;; 27
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db TOKEN_LBRACKET ;; 28
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db TOKEN_RBRACKET ;; 29
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align 8
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LEXEME_LENS:
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dq 0
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dq LEX_LET_len
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dq LEX_IF_len
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dq LEX_ELSE_len
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dq LEX_FN_len
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dq LEX_RETURN_len
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dq LEX_LOOP_len
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dq LEX_BREAK_len
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dq LEX_CONTINUE_len
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dq LEX_TRUE_len
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dq LEX_FALSE_len
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dq LEX_BOOL_len
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dq LEX_ARROW_len
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dq LEX_I32_len
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dq LEX_U32_len
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dq LEX_EQUALS_len
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dq LEX_PLUS_len
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dq LEX_MINUS_len
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dq LEX_RPARENS_len
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dq LEX_LPARENS_len
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dq LEX_RBRACE_len
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dq LEX_LBRACE_len
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dq LEX_COLON_len
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dq LEX_SEMI_len
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dq LEX_COMMA_len
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dq LEX_PIPE_len
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dq LEX_AMP_len
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dq LEX_EQEQ_len
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dq LEX_LBRACKET_len
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dq LEX_RBRACKET_len
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align 8
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NUM_LEXEMES: dq 30
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LEX_NOT_A_LEXEME db "<not a lexeme>", 0
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TOKEN_EOF equ 0
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TOKEN_LET equ 1
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LEX_LET db "let"
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LEX_LET_len equ $ - LEX_LET
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TOKEN_IF equ 2
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LEX_IF db "if"
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LEX_IF_len equ $ - LEX_IF
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TOKEN_ELSE equ 3
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LEX_ELSE db "else"
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LEX_ELSE_len equ $ - LEX_ELSE
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TOKEN_FN equ 4
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LEX_FN db "fn"
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LEX_FN_len equ $ - LEX_FN
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TOKEN_RETURN equ 5
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LEX_RETURN db "return"
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LEX_RETURN_len equ $ - LEX_RETURN
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TOKEN_LOOP equ 6
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LEX_LOOP db "loop"
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LEX_LOOP_len equ $ - LEX_LOOP
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TOKEN_BREAK equ 7
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LEX_BREAK db "break"
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LEX_BREAK_len equ $ - LEX_BREAK
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TOKEN_CONTINUE equ 8
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LEX_CONTINUE db "continue"
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LEX_CONTINUE_len equ $ - LEX_CONTINUE
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TOKEN_TRUE equ 9
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LEX_TRUE db "true"
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LEX_TRUE_len equ $ - LEX_TRUE
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TOKEN_FALSE equ 10
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LEX_FALSE db "false"
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LEX_FALSE_len equ $ - LEX_FALSE
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TOKEN_BOOL equ 11
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LEX_BOOL db "bool"
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LEX_BOOL_len equ $ - LEX_BOOL
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TOKEN_ARROW equ 12
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LEX_ARROW db "->"
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LEX_ARROW_len equ $ - LEX_ARROW
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TOKEN_I32 equ 13
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LEX_I32 db "i32"
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LEX_I32_len equ $ - LEX_I32
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TOKEN_U32 equ 14
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LEX_U32 db "u32"
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LEX_U32_len equ $ - LEX_U32
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TOKEN_EQUALS equ 15
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LEX_EQUALS db "="
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LEX_EQUALS_len equ $ - LEX_EQUALS
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TOKEN_PLUS equ 16
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LEX_PLUS db "+"
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LEX_PLUS_len equ $ - LEX_PLUS
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TOKEN_MINUS equ 17
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LEX_MINUS db "-"
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LEX_MINUS_len equ $ - LEX_MINUS
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TOKEN_RPARENS equ 18
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LEX_RPARENS db ")"
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LEX_RPARENS_len equ $ - LEX_RPARENS
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TOKEN_LPARENS equ 19
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LEX_LPARENS db "("
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LEX_LPARENS_len equ $ - LEX_LPARENS
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TOKEN_RBRACE equ 20
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LEX_RBRACE db "}"
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LEX_RBRACE_len equ $ - LEX_RBRACE
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TOKEN_LBRACE equ 21
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LEX_LBRACE db "{"
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LEX_LBRACE_len equ $ - LEX_LBRACE
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TOKEN_COLON equ 22
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LEX_COLON db ":"
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LEX_COLON_len equ $ - LEX_COLON
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TOKEN_SEMI equ 23
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LEX_SEMI db ";"
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LEX_SEMI_len equ $ - LEX_SEMI
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TOKEN_COMMA equ 24
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LEX_COMMA db ","
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LEX_COMMA_len equ $ - LEX_COMMA
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TOKEN_PIPE equ 25
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LEX_PIPE db "|"
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LEX_PIPE_len equ $ - LEX_PIPE
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TOKEN_AMP equ 26
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LEX_AMP db "&"
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LEX_AMP_len equ $ - LEX_AMP
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TOKEN_EQEQ equ 27
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LEX_EQEQ db "=="
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LEX_EQEQ_len equ $ - LEX_EQEQ
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TOKEN_LBRACKET equ 28
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LEX_LBRACKET db "["
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LEX_LBRACKET_len equ $ - LEX_LBRACKET
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TOKEN_RBRACKET equ 29
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LEX_RBRACKET db "]"
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LEX_RBRACKET_len equ $ - LEX_RBRACKET
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TOKEN_IDENT equ 30
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LEX_IDENT db "<identifier>"
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LEX_IDENT_len equ $ - LEX_IDENT
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TOKEN_NUMBER equ 31
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LEX_NUMBER db "<number>"
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LEX_NUMBER_len equ $ - LEX_NUMBER
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TOKEN_STRING equ 32
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LEX_STRING db "<string>"
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LEX_STRING_len equ $ - LEX_STRING
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TOKEN_COMMENT equ 33
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LEX_COMMENT db "<comment>"
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LEX_COMMENT_len equ $ - LEX_COMMENT
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section .text
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;; rdi: length of previously matched lexeme
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;; returns the length of the ident
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;; fn is_ident(lexeme_len: usize) -> usize
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is_ident:
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push rbp
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mov rbp, rsp
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push r12
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push r13
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push r14
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push rdi
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mov rax, [rel cursor]
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mov r12, [rel buffer]
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mov r13, [rel buffer_len]
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sub r13, rax
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add r12, rax
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; check first char is id_start
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mov dil, [r12]
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call is_id_start
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test rax, rax
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je .not_ident
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mov r14, 1
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.loop:
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cmp r14, r13
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jge .done
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mov dil, [r12 + r14]
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; check for id_continue
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call is_id_continue
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test rax, rax
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je .done
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inc r14
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jmp .loop
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.done:
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; r14 is length of ident
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mov rdi, [rsp]
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cmp r14, rdi
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jle .not_ident
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mov rax, [rel cursor]
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add rax, r14
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mov [rel cursor], rax
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mov rax, r14
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jmp .epilogue
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.not_ident:
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xor rax, rax
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.epilogue:
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pop rdi
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pop r14
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pop r13
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pop r12
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pop rbp
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ret
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is_comment:
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push rbp
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mov rbp, rsp
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push r12
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push r13
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push r14
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mov rax, [rel cursor]
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mov r12, [rel buffer]
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mov r13, [rel buffer_len]
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add r12, rax
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sub r13, rax
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mov dil, [r12]
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cmp dil, '/'
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jne .not_comment
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mov r14, 1
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cmp r14, r13
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jge .not_comment
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mov dil, [r12 + r14]
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cmp dil, '/'
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jne .not_comment
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.loop:
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inc r14
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cmp r14, r13
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jge .comment
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mov dil, [r12 + r14]
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cmp dil, 10 ; newline
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jne .loop
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.comment:
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mov rax, [rel cursor]
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add rax, r14
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mov [rel cursor], rax
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mov rax, r14
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jmp .epilogue
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.not_comment:
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xor rax, rax
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.epilogue:
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pop r14
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pop r13
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pop r12
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pop rbp
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ret
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;; Strings are sequences of characters enclosed in double quotes
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;; Strings span multiple lines, and may in the future contain escape sequences
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is_string:
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push rbp
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mov rbp, rsp
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push r12
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push r13
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push r14
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mov rax, [rel cursor]
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mov r12, [rel buffer]
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mov r13, [rel buffer_len]
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add r12, rax
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sub r13, rax
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mov dil, [r12]
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cmp dil, '"'
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jne .not_string
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mov r14, 1
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.loop:
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cmp r14, r13
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jge .unterminated
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mov dil, [r12 + r14]
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cmp dil, '"'
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je .string
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cmp dil, 0x5c ; backslash
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je .escape
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inc r14
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jmp .loop
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.escape:
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inc r14
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cmp r14, r13
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jge .unterminated
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inc r14
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jmp .loop
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.string:
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mov rax, [rel cursor]
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inc r14 ; include closing quote
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add rax, r14
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mov [rel cursor], rax
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mov rax, r14
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jmp .epilogue
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.unterminated:
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;; TODO: report unterminated string error
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mov rax, r14
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jmp .epilogue
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.not_string:
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xor rax, rax
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.epilogue:
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pop r14
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pop r13
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pop r12
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pop rbp
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ret
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;; Numbers are sequences of numeric characters, interspersed with underscores
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;; The leading character must be numeric
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;; In the future, numbers may be prefixed with '0x' for hexadecimal or '0b' for binary.
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is_number:
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push rbp
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mov rbp, rsp
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push r12
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push r13
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push r14
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mov rax, [rel cursor]
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mov r12, [rel buffer]
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mov r13, [rel buffer_len]
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add r12, rax
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sub r13, rax
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mov dil, [r12]
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call is_numeric
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test rax, rax
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je .not_number
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mov r14, 1
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.loop:
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cmp r14, r13
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jge .number
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mov dil, [r12 + r14]
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call is_whitespace
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test rax, rax
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jne .number
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cmp dil, '_'
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je .loop_next
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call is_numeric
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test rax, rax
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je .not_number
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.loop_next:
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inc r14
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jmp .loop
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.number:
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mov rax, [rel cursor]
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add rax, r14
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mov [rel cursor], rax
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mov rax, r14
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jmp .epilogue
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.not_number:
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xor rax, rax
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.epilogue:
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pop r14
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pop r13
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pop r12
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pop rbp
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ret
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skip_whitespaces:
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push rbp
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mov rbp, rsp
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push r12
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push r13
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push r14
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; let start = buffer.add(cursor);
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; let end = buffer.add(buffer_len);
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mov r12, [rel cursor]
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mov r13, [rel buffer_len]
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mov r14, [rel buffer]
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; for ptr in start..end {
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.loop:
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cmp r12, r13
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jge .done
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mov dil, [r14 + r12]
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call is_whitespace
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test rax, rax
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je .done
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inc r12
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jmp .loop
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.done:
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mov [rel cursor], r12
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pop r14
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pop r13
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pop r12
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pop rbp
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ret
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;; rdi: pointer to out-struct
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;; fn find_lexeme() -> (u8, *const u8, usize)
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find_lexeme:
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push rbp
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mov rbp, rsp
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push rdi
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; skip whitespaces
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call skip_whitespaces
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;; init out struct
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mov rdi, [rsp]
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mov rax, [rel buffer]
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add rax, [rel cursor]
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mov qword [rdi], 0
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mov [rdi + 8], rax
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mov qword [rdi + 16], 0
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; check length
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mov rax, [rel cursor]
|
|
mov rcx, [rel buffer_len]
|
|
; if cursor >= buffer_len {
|
|
cmp rax, rcx
|
|
jge .eof
|
|
jmp .start
|
|
.eof:
|
|
; return TOKEN_EOF;
|
|
mov rax, TOKEN_EOF
|
|
pop rdi
|
|
pop rbp
|
|
ret
|
|
; }
|
|
.start:
|
|
push r12
|
|
; test special tokens:
|
|
; if buffer[cursor] == '"' {
|
|
call is_string
|
|
test rax, rax
|
|
jne .is_string
|
|
; } else if buffer[cursor].is_numeric() {
|
|
call is_number
|
|
; return is_number();
|
|
test rax, rax
|
|
jne .is_number
|
|
; } else if buffer[cursor..][..2] == "//" {
|
|
call is_comment
|
|
; // skip to end of line
|
|
test rax, rax
|
|
jne .is_comment
|
|
; }
|
|
.loop_init:
|
|
mov r12, 1
|
|
; for 1..NUM_LEXEMES {
|
|
.loop:
|
|
cmp r12, [rel NUM_LEXEMES]
|
|
jge .not_found
|
|
; let lexeme = LEXEMES[i];
|
|
lea rdi, [rel LEXEMES]
|
|
mov rdi, [rdi + r12*8]
|
|
lea rdx, [rel LEXEME_LENS]
|
|
mov rsi, [rdx + r12*8]
|
|
mov rax, [rel cursor]
|
|
mov rdx, [rel buffer]
|
|
add rdx, rax
|
|
; let len = LEXEME_LENS[i];
|
|
mov rcx, [rel buffer_len]
|
|
sub rcx, rax
|
|
jo .not_found
|
|
; if lexeme.len() > buffer.len() - cursor {
|
|
cmp rsi, rcx
|
|
jg .next
|
|
; continue;
|
|
; }
|
|
mov rcx, rsi
|
|
; if buffer[cursor..cursor+len] == lexeme {
|
|
call streq
|
|
test rax, rax
|
|
je .next
|
|
; if is_ident() {
|
|
mov rdi, rsi
|
|
call is_ident
|
|
test rax, rax
|
|
; return TOKEN_IDENT;
|
|
jne .is_ident
|
|
; } else {
|
|
mov rdi, [rsp + 8]
|
|
mov rax, [rel cursor]
|
|
; cursor += len;
|
|
lea rsi, [rel LEXEME_LENS]
|
|
mov rsi, [rsi + r12*8]
|
|
add rax, rsi
|
|
mov [rel cursor], rax
|
|
; return TOKENS[i];
|
|
lea rax, [rel TOKENS]
|
|
mov al, [rax + r12]
|
|
and rax, 0xFF
|
|
mov rdi, [rsp + 8]
|
|
mov [rdi], al
|
|
mov [rdi + 16], rsi
|
|
jmp .epilogue
|
|
; }
|
|
.next:
|
|
inc r12
|
|
jmp .loop
|
|
; }
|
|
; }
|
|
.not_found:
|
|
; if is_ident() {
|
|
xor rdi, rdi
|
|
call is_ident
|
|
test rax, rax
|
|
; return TOKEN_IDENT;
|
|
jne .is_ident
|
|
; } else {
|
|
; return TOKEN_EOF;
|
|
mov rdi, [rsp + 8]
|
|
mov qword [rdi], TOKEN_EOF
|
|
; }
|
|
.epilogue:
|
|
pop r12
|
|
pop rdi
|
|
pop rbp
|
|
mov rax, rdi
|
|
ret
|
|
.is_ident:
|
|
; rax = len
|
|
; out.0 = TOKEN_IDENT
|
|
; out.1 = buffer.add(cursor - len)
|
|
; out.2 = len
|
|
mov rdi, [rsp + 8]
|
|
mov qword [rdi], TOKEN_IDENT
|
|
mov [rdi + 16], rax
|
|
jmp .epilogue
|
|
.is_number:
|
|
mov rdi, [rsp + 8]
|
|
mov qword [rdi], TOKEN_NUMBER
|
|
mov [rdi + 16], rax
|
|
jmp .epilogue
|
|
.is_string:
|
|
mov rdi, [rsp + 8]
|
|
mov qword [rdi], TOKEN_STRING
|
|
mov [rdi + 16], rax
|
|
jmp .epilogue
|
|
.is_comment:
|
|
|
|
mov rdi, [rsp + 8]
|
|
mov qword [rdi], TOKEN_COMMENT
|
|
mov [rdi + 16], rax
|
|
jmp .epilogue
|