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# Eggshell runtime library
#
# Copyright (C) 2016 Patrick "P. J." McDermott
#
# This file is part of the Eggshell Linker.
#
# The Eggshell Linker is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# The Eggshell Linker is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the Eggshell Linker If not, see
# <http://www.gnu.org/licenses/>.
eshrtbegin()
{
cat <<-'EOF'
__ESC="$(printf '\033.')"; __ESC="${__ESC%.}"
__RS="$(printf '\036.')"; __RS="${__RS%.}"
__US="$(printf '\037.')"; __US="${__US%.}"
__fn_stack=''
__fn_frame=''
__fn_name=''
__fn_tu=''
__fn_vars=''
__fn_var_vals=''
__fn=''
__prev_tu=''
__prev_vars=''
__var=''
__val=''
__init_funcs=''
__fn_stack_push()
{
__fn_stack="${__fn_stack}${__RS}${__fn_frame}"
}
__fn_stack_peek()
{
__fn_frame="${__fn_stack##*${__RS}}"
}
__fn_stack_pop()
{
__fn_stack_peek
__fn_stack="${__fn_stack%${__RS}*}"
}
__fn_frame_encode()
{
# RS and US in frame variable values must be encoded.
__fn_var_vals="$(printf '%s' "${__fn_var_vals}" | sed "
s|${__ESC}|${__ESC}0|g;
s|${__RS}|${__ESC}1|g; s|${__US}|${__ESC}2|g;
")"
__fn_frame="${__fn_name}${__US}${__fn_tu}"
__fn_frame="${__fn_frame}${__US}${__fn_vars}${__US}${__fn_var_vals}"
}
__fn_frame_decode()
{
__fn_name="${__fn_frame%%${__US}*}"
__fn_frame="${__fn_frame#*${__US}}"
__fn_tu="${__fn_frame%%${__US}*}"
__fn_frame="${__fn_frame#*${__US}}"
__fn_vars="${__fn_frame%%${__US}*}"
__fn_var_vals="${__fn_frame#*${__US}}"
__fn_var_vals="$(printf '%s' "${__fn_var_vals}" | sed "
s|${__ESC}0|${__ESC}|g;
s|${__ESC}1|${__RS}|g; s|${__ESC}2|${__US}|g;
")"
}
__fn_ctxsw()
{
unset IFS
case "${__prev_tu}" in
${__fn_tu});;
?*)
# Unset static variables and functions from previous TU.
case "$(eval "printf '%s' \
\"\${__${__prev_tu}_static_vars}\"")" \
in ?*)
eval "unset \${__${__prev_tu}_static_vars}"
;; esac
for __fn in $(eval printf '%s' \
"\"\${__${__prev_tu}_static_fns}\""); do
unset -f "${__fn%:*}"
done
;; esac
case "${__fn_tu}" in
${__prev_tu});;
?*)
# Set static variables and function for the current TU.
eval "$(eval printf '%s' "\"$(eval printf '%s' \
"'\${__${__fn_tu}_static_var_vals}'")\"")"
for __fn in $(eval printf '%s' \
"\"\${__${__fn_tu}_static_fns}\""); do
eval "${__fn%:*}() { ${__fn#*:}; }"
done
;; esac
case "${__prev_vars}" in ?*)
unset ${__prev_vars}
;; esac
eval "${__fn_var_vals}"
}
__fn_update_vars()
{
for __var in ${__fn_vars}; do
__val="$(eval "printf '%s' \"\${${__var}}\"" | \
sed "s|'|'\\\\''|g;")"
__fn_var_vals="${__fn_var_vals} ${__var}='${__val}'"
done
}
__fn_start()
{
# Old state.
__prev_tu="${__fn_tu}"
__prev_vars="${__fn_vars}"
# Update local vars in stack.
__fn_stack_pop
__fn_vars="${__prev_vars}"
__fn_update_vars
__fn_frame_encode
__fn_stack_push
# New state.
__fn_name="${2}"
__fn_tu="${1}"
__fn_vars=
__fn_var_vals=
__fn_frame_encode
__fn_stack_push
# Switch.
__fn_ctxsw
}
__fn_end()
{
# Old state.
__fn_stack_pop
__fn_frame_decode
__prev_tu="${__fn_tu}"
__prev_vars="${__fn_vars}"
# New state.
__fn_stack_peek
__fn_frame_decode
# Switch.
__fn_ctxsw
}
__tu_end()
{
# Save TU static vars.
for __var in $(eval "printf '%s' \"\${__${__tu}_static_vars}\""); do
__val="$(eval "printf '%s' \"\${${__var}}\"" | \
sed "s|'|'\\\\''|g")"
eval "__${__tu}_static_var_vals=\"\${__${__tu}_static_var_vals}\
${__var}='\${__val}'\""
unset ${__var}
done
__tu=''
}
__stack_trace()
{
IFS="${__RS}"
for __fn_frame in ${__fn_stack#${__RS}}; do
printf '%s\n' "${__fn_frame%%${__US}*}"
done
}
__local()
{
for __var in "${@}"; do
case "${__var}" in
*=*)
__val="${__var#*=}"
__var="${__var%%=*}"
;;
*)
__val=''
;;
esac
case "${__var}" in [!A-Za-z_]* | *[!0-9A-Za-z_]*)
printf 'Syntax error: %s %s\n' \
'illegal static variable name:' "${__var}" >&2
exit 1
;; esac
eval "${__var}=\${__val}"
__fn_vars="${__fn_vars} ${__var}"
done
}
static()
{
case "${__tu}" in '')
printf 'Error: Cannot declare static variables in functions' >&2
exit 1
;; esac
for __var in "${@}"; do
case "${__var}" in
*=*)
__val="${__var#*=}"
__var="${__var%%=*}"
;;
*)
__val=''
;;
esac
case "${__var}" in [!A-Za-z_]* | *[!0-9A-Za-z_]*)
printf 'Syntax error: %s %s\n' \
'illegal static variable name:' "${__var}" >&2
exit 1
;; esac
eval "${__var}=\${__val}"
eval "__${__tu}_static_vars=\"\${__${__tu}_static_vars} \
${__var}\""
done
}
__init()
{
__init_funcs="${__init_funcs} ${1}"
}
EOF
}
eshrtend()
{
local entry="${1}"
shift 1
cat <<-'EOF'
for __func in ${__init_funcs}; do
${__func}
done
EOF
printf '%s "${@}"\n' "${entry_point}"
}
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