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\ Copyright (c) 1999 Daniel C. Sobral <dcs@freebsd.org>
\ All rights reserved.
\
\ Redistribution and use in source and binary forms, with or without
\ modification, are permitted provided that the following conditions
\ are met:
\ 1. Redistributions of source code must retain the above copyright
\ notice, this list of conditions and the following disclaimer.
\ 2. Redistributions in binary form must reproduce the above copyright
\ notice, this list of conditions and the following disclaimer in the
\ documentation and/or other materials provided with the distribution.
\
\ THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
\ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\ ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
\ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\ OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\ SUCH DAMAGE.
\
\ $FreeBSD: release/9.1.0/sys/boot/forth/support.4th 222417 2011-05-28 08:50:38Z julian $
\ Loader.rc support functions:
\
\ initialize ( addr len -- ) as above, plus load_conf_files
\ load_conf ( addr len -- ) load conf file given
\ include_conf_files ( -- ) load all conf files in load_conf_files
\ print_syntax_error ( -- ) print line and marker of where a syntax
\ error was detected
\ print_line ( -- ) print last line processed
\ load_kernel ( -- ) load kernel
\ load_modules ( -- ) load modules flagged
\
\ Exported structures:
\
\ string counted string structure
\ cell .addr string address
\ cell .len string length
\ module module loading information structure
\ cell module.flag should we load it?
\ string module.name module's name
\ string module.loadname name to be used in loading the module
\ string module.type module's type
\ string module.args flags to be passed during load
\ string module.beforeload command to be executed before load
\ string module.afterload command to be executed after load
\ string module.loaderror command to be executed if load fails
\ cell module.next list chain
\
\ Exported global variables;
\
\ string conf_files configuration files to be loaded
\ cell modules_options pointer to first module information
\ value verbose? indicates if user wants a verbose loading
\ value any_conf_read? indicates if a conf file was succesfully read
\
\ Other exported words:
\ note, strlen is internal
\ strdup ( addr len -- addr' len) similar to strdup(3)
\ strcat ( addr len addr' len' -- addr len+len' ) similar to strcat(3)
\ s' ( | string' -- addr len | ) similar to s"
\ rudimentary structure support
\ Exception values
1 constant ESYNTAX
2 constant ENOMEM
3 constant EFREE
4 constant ESETERROR \ error setting environment variable
5 constant EREAD \ error reading
6 constant EOPEN
7 constant EEXEC \ XXX never catched
8 constant EBEFORELOAD
9 constant EAFTERLOAD
\ I/O constants
0 constant SEEK_SET
1 constant SEEK_CUR
2 constant SEEK_END
0 constant O_RDONLY
1 constant O_WRONLY
2 constant O_RDWR
\ Crude structure support
: structure:
create here 0 , ['] drop , 0
does> create here swap dup @ allot cell+ @ execute
;
: member: create dup , over , + does> cell+ @ + ;
: ;structure swap ! ;
: constructor! >body cell+ ! ;
: constructor: over :noname ;
: ;constructor postpone ; swap cell+ ! ; immediate
: sizeof ' >body @ state @ if postpone literal then ; immediate
: offsetof ' >body cell+ @ state @ if postpone literal then ; immediate
: ptr 1 cells member: ;
: int 1 cells member: ;
\ String structure
structure: string
ptr .addr
int .len
constructor:
0 over .addr !
0 swap .len !
;constructor
;structure
\ Module options linked list
structure: module
int module.flag
sizeof string member: module.name
sizeof string member: module.loadname
sizeof string member: module.type
sizeof string member: module.args
sizeof string member: module.beforeload
sizeof string member: module.afterload
sizeof string member: module.loaderror
ptr module.next
;structure
\ Internal loader structures (preloaded_file, kernel_module, file_metadata)
\ must be in sync with the C struct in sys/boot/common/bootstrap.h
structure: preloaded_file
ptr pf.name
ptr pf.type
ptr pf.args
ptr pf.metadata \ file_metadata
int pf.loader
int pf.addr
int pf.size
ptr pf.modules \ kernel_module
ptr pf.next \ preloaded_file
;structure
structure: kernel_module
ptr km.name
\ ptr km.args
ptr km.fp \ preloaded_file
ptr km.next \ kernel_module
;structure
structure: file_metadata
int md.size
2 member: md.type \ this is not ANS Forth compatible (XXX)
ptr md.next \ file_metadata
0 member: md.data \ variable size
;structure
\ end of structures
\ Global variables
string conf_files
string nextboot_conf_file
create module_options sizeof module.next allot 0 module_options !
create last_module_option sizeof module.next allot 0 last_module_option !
0 value verbose?
0 value nextboot?
\ Support string functions
: strdup { addr len -- addr' len' }
len allocate if ENOMEM throw then
addr over len move len
;
: strcat { addr len addr' len' -- addr len+len' }
addr' addr len + len' move
addr len len' +
;
: strchr { addr len c -- addr' len' }
begin
len
while
addr c@ c = if addr len exit then
addr 1 + to addr
len 1 - to len
repeat
0 0
;
: s' \ same as s", allows " in the string
[char] ' parse
state @ if postpone sliteral then
; immediate
: 2>r postpone >r postpone >r ; immediate
: 2r> postpone r> postpone r> ; immediate
: 2r@ postpone 2r> postpone 2dup postpone 2>r ; immediate
: getenv? getenv -1 = if false else drop true then ;
\ Private definitions
vocabulary support-functions
only forth also support-functions definitions
\ Some control characters constants
7 constant bell
8 constant backspace
9 constant tab
10 constant lf
13 constant <cr>
\ Read buffer size
80 constant read_buffer_size
\ Standard suffixes
: load_module_suffix s" _load" ;
: module_loadname_suffix s" _name" ;
: module_type_suffix s" _type" ;
: module_args_suffix s" _flags" ;
: module_beforeload_suffix s" _before" ;
: module_afterload_suffix s" _after" ;
: module_loaderror_suffix s" _error" ;
\ Support operators
: >= < 0= ;
: <= > 0= ;
\ Assorted support functions
: free-memory free if EFREE throw then ;
: strget { var -- addr len } var .addr @ var .len @ ;
\ assign addr len to variable.
: strset { addr len var -- } addr var .addr ! len var .len ! ;
\ free memory and reset fields
: strfree { var -- } var .addr @ ?dup if free-memory 0 0 var strset then ;
\ free old content, make a copy of the string and assign to variable
: string= { addr len var -- } var strfree addr len strdup var strset ;
: strtype ( str -- ) strget type ;
\ assign a reference to what is on the stack
: strref { addr len var -- addr len }
addr var .addr ! len var .len ! addr len
;
\ unquote a string
: unquote ( addr len -- addr len )
over c@ [char] " = if 2 chars - swap char+ swap then
;
\ Assignment data temporary storage
string name_buffer
string value_buffer
\ Line by line file reading functions
\
\ exported:
\ line_buffer
\ end_of_file?
\ fd
\ read_line
\ reset_line_reading
vocabulary line-reading
also line-reading definitions also
\ File data temporary storage
string read_buffer
0 value read_buffer_ptr
\ File's line reading function
support-functions definitions
string line_buffer
0 value end_of_file?
variable fd
line-reading definitions
: skip_newlines
begin
read_buffer .len @ read_buffer_ptr >
while
read_buffer .addr @ read_buffer_ptr + c@ lf = if
read_buffer_ptr char+ to read_buffer_ptr
else
exit
then
repeat
;
: scan_buffer ( -- addr len )
read_buffer_ptr >r
begin
read_buffer .len @ r@ >
while
read_buffer .addr @ r@ + c@ lf = if
read_buffer .addr @ read_buffer_ptr + ( -- addr )
r@ read_buffer_ptr - ( -- len )
r> to read_buffer_ptr
exit
then
r> char+ >r
repeat
read_buffer .addr @ read_buffer_ptr + ( -- addr )
r@ read_buffer_ptr - ( -- len )
r> to read_buffer_ptr
;
: line_buffer_resize ( len -- len )
>r
line_buffer .len @ if
line_buffer .addr @
line_buffer .len @ r@ +
resize if ENOMEM throw then
else
r@ allocate if ENOMEM throw then
then
line_buffer .addr !
r>
;
: append_to_line_buffer ( addr len -- )
line_buffer strget
2swap strcat
line_buffer .len !
drop
;
: read_from_buffer
scan_buffer ( -- addr len )
line_buffer_resize ( len -- len )
append_to_line_buffer ( addr len -- )
;
: refill_required?
read_buffer .len @ read_buffer_ptr =
end_of_file? 0= and
;
: refill_buffer
0 to read_buffer_ptr
read_buffer .addr @ 0= if
read_buffer_size allocate if ENOMEM throw then
read_buffer .addr !
then
fd @ read_buffer .addr @ read_buffer_size fread
dup -1 = if EREAD throw then
dup 0= if true to end_of_file? then
read_buffer .len !
;
support-functions definitions
: reset_line_reading
0 to read_buffer_ptr
;
: read_line
line_buffer strfree
skip_newlines
begin
read_from_buffer
refill_required?
while
refill_buffer
repeat
;
only forth also support-functions definitions
\ Conf file line parser:
\ <line> ::= <spaces><name><spaces>'='<spaces><value><spaces>[<comment>] |
\ <spaces>[<comment>]
\ <name> ::= <letter>{<letter>|<digit>|'_'}
\ <value> ::= '"'{<character_set>|'\'<anything>}'"' | <name>
\ <character_set> ::= ASCII 32 to 126, except '\' and '"'
\ <comment> ::= '#'{<anything>}
\
\ exported:
\ line_pointer
\ process_conf
0 value line_pointer
vocabulary file-processing
also file-processing definitions
\ parser functions
\
\ exported:
\ get_assignment
vocabulary parser
also parser definitions also
0 value parsing_function
0 value end_of_line
: end_of_line? line_pointer end_of_line = ;
\ classifiers for various character classes in the input line
: letter?
line_pointer c@ >r
r@ [char] A >=
r@ [char] Z <= and
r@ [char] a >=
r> [char] z <= and
or
;
: digit?
line_pointer c@ >r
r@ [char] - =
r@ [char] 0 >=
r> [char] 9 <= and
or
;
: quote? line_pointer c@ [char] " = ;
: assignment_sign? line_pointer c@ [char] = = ;
: comment? line_pointer c@ [char] # = ;
: space? line_pointer c@ bl = line_pointer c@ tab = or ;
: backslash? line_pointer c@ [char] \ = ;
: underscore? line_pointer c@ [char] _ = ;
: dot? line_pointer c@ [char] . = ;
\ manipulation of input line
: skip_character line_pointer char+ to line_pointer ;
: skip_to_end_of_line end_of_line to line_pointer ;
: eat_space
begin
end_of_line? if 0 else space? then
while
skip_character
repeat
;
: parse_name ( -- addr len )
line_pointer
begin
end_of_line? if 0 else letter? digit? underscore? dot? or or or then
while
skip_character
repeat
line_pointer over -
strdup
;
: remove_backslashes { addr len | addr' len' -- addr' len' }
len allocate if ENOMEM throw then
to addr'
addr >r
begin
addr c@ [char] \ <> if
addr c@ addr' len' + c!
len' char+ to len'
then
addr char+ to addr
r@ len + addr =
until
r> drop
addr' len'
;
: parse_quote ( -- addr len )
line_pointer
skip_character
end_of_line? if ESYNTAX throw then
begin
quote? 0=
while
backslash? if
skip_character
end_of_line? if ESYNTAX throw then
then
skip_character
end_of_line? if ESYNTAX throw then
repeat
skip_character
line_pointer over -
remove_backslashes
;
: read_name
parse_name ( -- addr len )
name_buffer strset
;
: read_value
quote? if
parse_quote ( -- addr len )
else
parse_name ( -- addr len )
then
value_buffer strset
;
: comment
skip_to_end_of_line
;
: white_space_4
eat_space
comment? if ['] comment to parsing_function exit then
end_of_line? 0= if ESYNTAX throw then
;
: variable_value
read_value
['] white_space_4 to parsing_function
;
: white_space_3
eat_space
letter? digit? quote? or or if
['] variable_value to parsing_function exit
then
ESYNTAX throw
;
: assignment_sign
skip_character
['] white_space_3 to parsing_function
;
: white_space_2
eat_space
assignment_sign? if ['] assignment_sign to parsing_function exit then
ESYNTAX throw
;
: variable_name
read_name
['] white_space_2 to parsing_function
;
: white_space_1
eat_space
letter? if ['] variable_name to parsing_function exit then
comment? if ['] comment to parsing_function exit then
end_of_line? 0= if ESYNTAX throw then
;
file-processing definitions
: get_assignment
line_buffer strget + to end_of_line
line_buffer .addr @ to line_pointer
['] white_space_1 to parsing_function
begin
end_of_line? 0=
while
parsing_function execute
repeat
parsing_function ['] comment =
parsing_function ['] white_space_1 =
parsing_function ['] white_space_4 =
or or 0= if ESYNTAX throw then
;
only forth also support-functions also file-processing definitions also
\ Process line
: assignment_type? ( addr len -- flag )
name_buffer strget
compare 0=
;
: suffix_type? ( addr len -- flag )
name_buffer .len @ over <= if 2drop false exit then
name_buffer .len @ over - name_buffer .addr @ +
over compare 0=
;
: loader_conf_files? s" loader_conf_files" assignment_type? ;
: nextboot_flag? s" nextboot_enable" assignment_type? ;
: nextboot_conf? s" nextboot_conf" assignment_type? ;
: verbose_flag? s" verbose_loading" assignment_type? ;
: execute? s" exec" assignment_type? ;
: module_load? load_module_suffix suffix_type? ;
: module_loadname? module_loadname_suffix suffix_type? ;
: module_type? module_type_suffix suffix_type? ;
: module_args? module_args_suffix suffix_type? ;
: module_beforeload? module_beforeload_suffix suffix_type? ;
: module_afterload? module_afterload_suffix suffix_type? ;
: module_loaderror? module_loaderror_suffix suffix_type? ;
\ build a 'set' statement and execute it
: set_environment_variable
name_buffer .len @ value_buffer .len @ + 5 chars + \ size of result string
allocate if ENOMEM throw then
dup 0 \ start with an empty string and append the pieces
s" set " strcat
name_buffer strget strcat
s" =" strcat
value_buffer strget strcat
['] evaluate catch if
2drop free drop
ESETERROR throw
else
free-memory
then
;
: set_conf_files
set_environment_variable
s" loader_conf_files" getenv conf_files string=
;
: set_nextboot_conf \ XXX maybe do as set_conf_files ?
value_buffer strget unquote nextboot_conf_file string=
;
: append_to_module_options_list ( addr -- )
module_options @ 0= if
dup module_options !
last_module_option !
else
dup last_module_option @ module.next !
last_module_option !
then
;
: set_module_name { addr -- } \ check leaks
name_buffer strget addr module.name string=
;
: yes_value?
value_buffer strget \ XXX could use unquote
2dup s' "YES"' compare >r
2dup s' "yes"' compare >r
2dup s" YES" compare >r
s" yes" compare r> r> r> and and and 0=
;
: find_module_option ( -- addr | 0 ) \ return ptr to entry matching name_buffer
module_options @
begin
dup
while
dup module.name strget
name_buffer strget
compare 0= if exit then
module.next @
repeat
;
: new_module_option ( -- addr )
sizeof module allocate if ENOMEM throw then
dup sizeof module erase
dup append_to_module_options_list
dup set_module_name
;
: get_module_option ( -- addr )
find_module_option
?dup 0= if new_module_option then
;
: set_module_flag
name_buffer .len @ load_module_suffix nip - name_buffer .len !
yes_value? get_module_option module.flag !
;
: set_module_args
name_buffer .len @ module_args_suffix nip - name_buffer .len !
value_buffer strget unquote
get_module_option module.args string=
;
: set_module_loadname
name_buffer .len @ module_loadname_suffix nip - name_buffer .len !
value_buffer strget unquote
get_module_option module.loadname string=
;
: set_module_type
name_buffer .len @ module_type_suffix nip - name_buffer .len !
value_buffer strget unquote
get_module_option module.type string=
;
: set_module_beforeload
name_buffer .len @ module_beforeload_suffix nip - name_buffer .len !
value_buffer strget unquote
get_module_option module.beforeload string=
;
: set_module_afterload
name_buffer .len @ module_afterload_suffix nip - name_buffer .len !
value_buffer strget unquote
get_module_option module.afterload string=
;
: set_module_loaderror
name_buffer .len @ module_loaderror_suffix nip - name_buffer .len !
value_buffer strget unquote
get_module_option module.loaderror string=
;
: set_nextboot_flag
yes_value? to nextboot?
;
: set_verbose
yes_value? to verbose?
;
: execute_command
value_buffer strget unquote
['] evaluate catch if EEXEC throw then
;
: process_assignment
name_buffer .len @ 0= if exit then
loader_conf_files? if set_conf_files exit then
nextboot_flag? if set_nextboot_flag exit then
nextboot_conf? if set_nextboot_conf exit then
verbose_flag? if set_verbose exit then
execute? if execute_command exit then
module_load? if set_module_flag exit then
module_loadname? if set_module_loadname exit then
module_type? if set_module_type exit then
module_args? if set_module_args exit then
module_beforeload? if set_module_beforeload exit then
module_afterload? if set_module_afterload exit then
module_loaderror? if set_module_loaderror exit then
set_environment_variable
;
\ free_buffer ( -- )
\
\ Free some pointers if needed. The code then tests for errors
\ in freeing, and throws an exception if needed. If a pointer is
\ not allocated, it's value (0) is used as flag.
: free_buffers
name_buffer strfree
value_buffer strfree
;
\ Higher level file processing
support-functions definitions
: process_conf
begin
end_of_file? 0=
while
free_buffers
read_line
get_assignment
['] process_assignment catch
['] free_buffers catch
swap throw throw
repeat
;
: peek_file
0 to end_of_file?
reset_line_reading
O_RDONLY fopen fd !
fd @ -1 = if EOPEN throw then
free_buffers
read_line
get_assignment
['] process_assignment catch
['] free_buffers catch
fd @ fclose
;
only forth also support-functions definitions
\ Interface to loading conf files
: load_conf ( addr len -- )
\ ." ----- Trying conf " 2dup type cr \ debugging
0 to end_of_file?
reset_line_reading
O_RDONLY fopen fd !
fd @ -1 = if EOPEN throw then
['] process_conf catch
fd @ fclose
throw
;
: print_line line_buffer strtype cr ;
: print_syntax_error
line_buffer strtype cr
line_buffer .addr @
begin
line_pointer over <>
while
bl emit char+
repeat
drop
." ^" cr
;
\ Debugging support functions
only forth definitions also support-functions
: test-file
['] load_conf catch dup .
ESYNTAX = if cr print_syntax_error then
;
\ find a module name, leave addr on the stack (0 if not found)
: find-module ( <module> -- ptr | 0 )
bl parse ( addr len )
module_options @ >r ( store current pointer )
begin
r@
while
2dup ( addr len addr len )
r@ module.name strget
compare 0= if drop drop r> exit then ( found it )
r> module.next @ >r
repeat
type ." was not found" cr r>
;
: show-nonempty ( addr len mod -- )
strget dup verbose? or if
2swap type type cr
else
drop drop drop drop
then ;
: show-one-module { addr -- addr }
." Name: " addr module.name strtype cr
s" Path: " addr module.loadname show-nonempty
s" Type: " addr module.type show-nonempty
s" Flags: " addr module.args show-nonempty
s" Before load: " addr module.beforeload show-nonempty
s" After load: " addr module.afterload show-nonempty
s" Error: " addr module.loaderror show-nonempty
." Status: " addr module.flag @ if ." Load" else ." Don't load" then cr
cr
addr
;
: show-module-options
module_options @
begin
?dup
while
show-one-module
module.next @
repeat
;
only forth also support-functions definitions
\ Variables used for processing multiple conf files
string current_file_name_ref \ used to print the file name
\ Indicates if any conf file was succesfully read
0 value any_conf_read?
\ loader_conf_files processing support functions
: get_conf_files ( -- addr len ) \ put addr/len on stack, reset var
\ ." -- starting on <" conf_files strtype ." >" cr \ debugging
conf_files strget 0 0 conf_files strset
;
: skip_leading_spaces { addr len pos -- addr len pos' }
begin
pos len = if 0 else addr pos + c@ bl = then
while
pos char+ to pos
repeat
addr len pos
;
\ return the file name at pos, or free the string if nothing left
: get_file_name { addr len pos -- addr len pos' addr' len' || 0 }
pos len = if
addr free abort" Fatal error freeing memory"
0 exit
then
pos >r
begin
\ stay in the loop until have chars and they are not blank
pos len = if 0 else addr pos + c@ bl <> then
while
pos char+ to pos
repeat
addr len pos addr r@ + pos r> -
\ 2dup ." get_file_name has " type cr \ debugging
;
: get_next_file ( addr len ptr -- addr len ptr' addr' len' | 0 )
skip_leading_spaces
get_file_name
;
: print_current_file
current_file_name_ref strtype
;
: process_conf_errors
dup 0= if true to any_conf_read? drop exit then
>r 2drop r>
dup ESYNTAX = if
." Warning: syntax error on file " print_current_file cr
print_syntax_error drop exit
then
dup ESETERROR = if
." Warning: bad definition on file " print_current_file cr
print_line drop exit
then
dup EREAD = if
." Warning: error reading file " print_current_file cr drop exit
then
dup EOPEN = if
verbose? if ." Warning: unable to open file " print_current_file cr then
drop exit
then
dup EFREE = abort" Fatal error freeing memory"
dup ENOMEM = abort" Out of memory"
throw \ Unknown error -- pass ahead
;
\ Process loader_conf_files recursively
\ Interface to loader_conf_files processing
: include_conf_files
get_conf_files 0 ( addr len offset )
begin
get_next_file ?dup ( addr len 1 | 0 )
while
current_file_name_ref strref
['] load_conf catch
process_conf_errors
conf_files .addr @ if recurse then
repeat
;
: get_nextboot_conf_file ( -- addr len )
nextboot_conf_file strget strdup \ XXX is the strdup a leak ?
;
: rewrite_nextboot_file ( -- )
get_nextboot_conf_file
O_WRONLY fopen fd !
fd @ -1 = if EOPEN throw then
fd @ s' nextboot_enable="NO" ' fwrite
fd @ fclose
;
: include_nextboot_file
get_nextboot_conf_file
['] peek_file catch
nextboot? if
get_nextboot_conf_file
['] load_conf catch
process_conf_errors
['] rewrite_nextboot_file catch
then
;
\ Module loading functions
: load_parameters { addr -- addr addrN lenN ... addr1 len1 N }
addr
addr module.args strget
addr module.loadname .len @ if
addr module.loadname strget
else
addr module.name strget
then
addr module.type .len @ if
addr module.type strget
s" -t "
4 ( -t type name flags )
else
2 ( name flags )
then
;
: before_load ( addr -- addr )
dup module.beforeload .len @ if
dup module.beforeload strget
['] evaluate catch if EBEFORELOAD throw then
then
;
: after_load ( addr -- addr )
dup module.afterload .len @ if
dup module.afterload strget
['] evaluate catch if EAFTERLOAD throw then
then
;
: load_error ( addr -- addr )
dup module.loaderror .len @ if
dup module.loaderror strget
evaluate \ This we do not intercept so it can throw errors
then
;
: pre_load_message ( addr -- addr )
verbose? if
dup module.name strtype
." ..."
then
;
: load_error_message verbose? if ." failed!" cr then ;
: load_succesful_message verbose? if ." ok" cr then ;
: load_module
load_parameters load
;
: process_module ( addr -- addr )
pre_load_message
before_load
begin
['] load_module catch if
dup module.loaderror .len @ if
load_error \ Command should return a flag!
else
load_error_message true \ Do not retry
then
else
after_load
load_succesful_message true \ Succesful, do not retry
then
until
;
: process_module_errors ( addr ior -- )
dup EBEFORELOAD = if
drop
." Module "
dup module.name strtype
dup module.loadname .len @ if
." (" dup module.loadname strtype ." )"
then
cr
." Error executing "
dup module.beforeload strtype cr \ XXX there was a typo here
abort
then
dup EAFTERLOAD = if
drop
." Module "
dup module.name .addr @ over module.name .len @ type
dup module.loadname .len @ if
." (" dup module.loadname strtype ." )"
then
cr
." Error executing "
dup module.afterload strtype cr
abort
then
throw \ Don't know what it is all about -- pass ahead
;
\ Module loading interface
\ scan the list of modules, load enabled ones.
: load_modules ( -- ) ( throws: abort & user-defined )
module_options @ ( list_head )
begin
?dup
while
dup module.flag @ if
['] process_module catch
process_module_errors
then
module.next @
repeat
;
\ h00h00 magic used to try loading either a kernel with a given name,
\ or a kernel with the default name in a directory of a given name
\ (the pain!)
: bootpath s" /boot/" ;
: modulepath s" module_path" ;
\ Functions used to save and restore module_path's value.
: saveenv ( addr len | -1 -- addr' len | 0 -1 )
dup -1 = if 0 swap exit then
strdup
;
: freeenv ( addr len | 0 -1 )
-1 = if drop else free abort" Freeing error" then
;
: restoreenv ( addr len | 0 -1 -- )
dup -1 = if ( it wasn't set )
2drop
modulepath unsetenv
else
over >r
modulepath setenv
r> free abort" Freeing error"
then
;
: clip_args \ Drop second string if only one argument is passed
1 = if
2swap 2drop
1
else
2
then
;
also builtins
\ Parse filename from a semicolon-separated list
\ replacement, not working yet
: newparse-; { addr len | a1 -- a' len-x addr x }
addr len [char] ; strchr dup if ( a1 len1 )
swap to a1 ( store address )
1 - a1 @ 1 + swap ( remove match )
addr a1 addr -
else
0 0 addr len
then
;
: parse-; ( addr len -- addr' len-x addr x )
over 0 2swap ( addr 0 addr len )
begin
dup 0 <> ( addr 0 addr len )
while
over c@ [char] ; <> ( addr 0 addr len flag )
while
1- swap 1+ swap
2swap 1+ 2swap
repeat then
dup 0 <> if
1- swap 1+ swap
then
2swap
;
\ Try loading one of multiple kernels specified
: try_multiple_kernels ( addr len addr' len' args -- flag )
>r
begin
parse-; 2>r
2over 2r>
r@ clip_args
s" DEBUG" getenv? if
s" echo Module_path: ${module_path}" evaluate
." Kernel : " >r 2dup type r> cr
dup 2 = if ." Flags : " >r 2over type r> cr then
then
1 load
while
dup 0=
until
1 >r \ Failure
else
0 >r \ Success
then
2drop 2drop
r>
r> drop
;
\ Try to load a kernel; the kernel name is taken from one of
\ the following lists, as ordered:
\
\ 1. The "bootfile" environment variable
\ 2. The "kernel" environment variable
\
\ Flags are passed, if available. If not, dummy values must be given.
\
\ The kernel gets loaded from the current module_path.
: load_a_kernel ( flags len 1 | x x 0 -- flag )
local args
2local flags
0 0 2local kernel
end-locals
\ Check if a default kernel name exists at all, exits if not
s" bootfile" getenv dup -1 <> if
to kernel
flags kernel args 1+ try_multiple_kernels
dup 0= if exit then
then
drop
s" kernel" getenv dup -1 <> if
to kernel
else
drop
1 exit \ Failure
then
\ Try all default kernel names
flags kernel args 1+ try_multiple_kernels
;
\ Try to load a kernel; the kernel name is taken from one of
\ the following lists, as ordered:
\
\ 1. The "bootfile" environment variable
\ 2. The "kernel" environment variable
\
\ Flags are passed, if provided.
\
\ The kernel will be loaded from a directory computed from the
\ path given. Two directories will be tried in the following order:
\
\ 1. /boot/path
\ 2. path
\
\ The module_path variable is overridden if load is succesful, by
\ prepending the successful path.
: load_from_directory ( path len 1 | flags len' path len 2 -- flag )
local args
2local path
args 1 = if 0 0 then
2local flags
0 0 2local oldmodulepath \ like a string
0 0 2local newmodulepath \ like a string
end-locals
\ Set the environment variable module_path, and try loading
\ the kernel again.
modulepath getenv saveenv to oldmodulepath
\ Try prepending /boot/ first
bootpath nip path nip + \ total length
oldmodulepath nip dup -1 = if
drop
else
1+ + \ add oldpath -- XXX why the 1+ ?
then
allocate if ( out of memory ) 1 exit then \ XXX throw ?
0
bootpath strcat
path strcat
2dup to newmodulepath
modulepath setenv
\ Try all default kernel names
flags args 1- load_a_kernel
0= if ( success )
oldmodulepath nip -1 <> if
newmodulepath s" ;" strcat
oldmodulepath strcat
modulepath setenv
newmodulepath drop free-memory
oldmodulepath drop free-memory
then
0 exit
then
\ Well, try without the prepended /boot/
path newmodulepath drop swap move
newmodulepath drop path nip
2dup to newmodulepath
modulepath setenv
\ Try all default kernel names
flags args 1- load_a_kernel
if ( failed once more )
oldmodulepath restoreenv
newmodulepath drop free-memory
1
else
oldmodulepath nip -1 <> if
newmodulepath s" ;" strcat
oldmodulepath strcat
modulepath setenv
newmodulepath drop free-memory
oldmodulepath drop free-memory
then
0
then
;
\ Try to load a kernel; the kernel name is taken from one of
\ the following lists, as ordered:
\
\ 1. The "bootfile" environment variable
\ 2. The "kernel" environment variable
\ 3. The "path" argument
\
\ Flags are passed, if provided.
\
\ The kernel will be loaded from a directory computed from the
\ path given. Two directories will be tried in the following order:
\
\ 1. /boot/path
\ 2. path
\
\ Unless "path" is meant to be kernel name itself. In that case, it
\ will first be tried as a full path, and, next, search on the
\ directories pointed by module_path.
\
\ The module_path variable is overridden if load is succesful, by
\ prepending the successful path.
: load_directory_or_file ( path len 1 | flags len' path len 2 -- flag )
local args
2local path
args 1 = if 0 0 then
2local flags
end-locals
\ First, assume path is an absolute path to a directory
flags path args clip_args load_from_directory
dup 0= if exit else drop then
\ Next, assume path points to the kernel
flags path args try_multiple_kernels
;
: initialize ( addr len -- )
strdup conf_files strset
;
: kernel_options ( -- addr len 1 | 0 )
s" kernel_options" getenv
dup -1 = if drop 0 else 1 then
;
: standard_kernel_search ( flags 1 | 0 -- flag )
local args
args 0= if 0 0 then
2local flags
s" kernel" getenv
dup -1 = if 0 swap then
2local path
end-locals
path nip -1 = if ( there isn't a "kernel" environment variable )
flags args load_a_kernel
else
flags path args 1+ clip_args load_directory_or_file
then
;
: load_kernel ( -- ) ( throws: abort )
kernel_options standard_kernel_search
abort" Unable to load a kernel!"
;
: set_defaultoptions ( -- )
s" kernel_options" getenv dup -1 = if
drop
else
s" temp_options" setenv
then
;
\ pick the i-th argument, i starts at 0
: argv[] ( aN uN ... a1 u1 N i -- aN uN ... a1 u1 N ai+1 ui+1 )
2dup = if 0 0 exit then \ out of range
dup >r
1+ 2* ( skip N and ui )
pick
r>
1+ 2* ( skip N and ai )
pick
;
: drop_args ( aN uN ... a1 u1 N -- )
0 ?do 2drop loop
;
: argc
dup
;
: queue_argv ( aN uN ... a1 u1 N a u -- a u aN uN ... a1 u1 N+1 )
>r
over 2* 1+ -roll
r>
over 2* 1+ -roll
1+
;
: unqueue_argv ( aN uN ... a1 u1 N -- aN uN ... a2 u2 N-1 a1 u1 )
1- -rot
;
\ compute the length of the buffer including the spaces between words
: strlen(argv) ( aN uN .. a1 u1 N -- aN uN .. a1 u1 N len )
dup 0= if 0 exit then
0 >r \ Size
0 >r \ Index
begin
argc r@ <>
while
r@ argv[]
nip
r> r> rot + 1+
>r 1+ >r
repeat
r> drop
r>
;
: concat_argv ( aN uN ... a1 u1 N -- a u )
strlen(argv) allocate if ENOMEM throw then
0 2>r ( save addr 0 on return stack )
begin
dup
while
unqueue_argv ( ... N a1 u1 )
2r> 2swap ( old a1 u1 )
strcat
s" " strcat ( append one space ) \ XXX this gives a trailing space
2>r ( store string on the result stack )
repeat
drop_args
2r>
;
: set_tempoptions ( addrN lenN ... addr1 len1 N -- addr len 1 | 0 )
\ Save the first argument, if it exists and is not a flag
argc if
0 argv[] drop c@ [char] - <> if
unqueue_argv 2>r \ Filename
1 >r \ Filename present
else
0 >r \ Filename not present
then
else
0 >r \ Filename not present
then
\ If there are other arguments, assume they are flags
?dup if
concat_argv
2dup s" temp_options" setenv
drop free if EFREE throw then
else
set_defaultoptions
then
\ Bring back the filename, if one was provided
r> if 2r> 1 else 0 then
;
: get_arguments ( -- addrN lenN ... addr1 len1 N )
0
begin
\ Get next word on the command line
parse-word
?dup while
queue_argv
repeat
drop ( empty string )
;
: load_kernel_and_modules ( args -- flag )
set_tempoptions
argc >r
s" temp_options" getenv dup -1 <> if
queue_argv
else
drop
then
r> if ( a path was passed )
load_directory_or_file
else
standard_kernel_search
then
?dup 0= if ['] load_modules catch then
;
\ Go back to straight forth vocabulary
only forth also definitions