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makeopcodetargets.py
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makeopcodetargets.py
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#! /usr/bin/env python
"""Generate C code for the jump table of the threaded code interpreter
(for compilers supporting computed gotos or "labels-as-values", such as gcc).
"""
import
os
import
sys
try
:
from
importlib
.
machinery
import
SourceFileLoader
except
ImportError
:
import
imp
def
find_module
(
modname
):
"""Finds and returns a module in the local dist/checkout.
"""
modpath
=
os
.
path
.
join
(
os
.
path
.
dirname
(
os
.
path
.
dirname
(
__file__
)),
"Lib"
)
return
imp
.
load_module
(
modname
,
*
imp
.
find_module
(
modname
, [
modpath
]))
else
:
def
find_module
(
modname
):
"""Finds and returns a module in the local dist/checkout.
"""
modpath
=
os
.
path
.
join
(
os
.
path
.
dirname
(
os
.
path
.
dirname
(
__file__
)),
"Lib"
,
modname
+
".py"
)
return
SourceFileLoader
(
modname
,
modpath
).
load_module
()
def
write_contents
(
f
):
"""Write C code contents to the target file object.
"""
opcode
=
find_module
(
'opcode'
)
targets
=
[
'_unknown_opcode'
]
*
256
for
opname
,
op
in
opcode
.
opmap
.
items
():
targets
[
op
]
=
"TARGET_%s"
%
opname
f
.
write
(
"static void *opcode_targets[256] = {
\n
"
)
f
.
write
(
",
\n
"
.
join
([
" &&%s"
%
s
for
s
in
targets
]))
f
.
write
(
"
\n
};
\n
"
)
def
main
():
if
len
(
sys
.
argv
)
>=
3
:
sys
.
exit
(
"Too many arguments"
)
if
len
(
sys
.
argv
)
==
2
:
target
=
sys
.
argv
[
1
]
else
:
target
=
"Python/opcode_targets.h"
with
open
(
target
,
"w"
)
as
f
:
write_contents
(
f
)
print
(
"Jump table written into %s"
%
target
)
if
__name__
==
"__main__"
:
main
()
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