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# Copyright 2015 David Malcolm <dmalcolm@redhat.com>
# Copyright 2015 Red Hat, Inc.
#
# This 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.
#
# This program 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 this program. If not, see
# <http://www.gnu.org/licenses/>.
# A compiler for the "bf" language
import sys
import gccjit
class Paren:
def __init__(self, b_test, b_body, b_after):
self.b_test = b_test
self.b_body = b_body
self.b_after = b_after
class CompileError(Exception):
def __init__(self, compiler, msg):
self.filename = compiler.filename
self.line = compiler.line
self.column = compiler.column
self.msg = msg
def __str__(self):
return ("%s:%i:%i: %s"
% (self.filename, self.line, self.column, self.msg))
class Compiler:
def __init__(self): #, filename):
self.ctxt = gccjit.Context()
if 1:
self.ctxt.set_int_option(gccjit.IntOption.OPTIMIZATION_LEVEL,
3);
self.ctxt.set_bool_option(gccjit.BoolOption.DUMP_INITIAL_GIMPLE,
0);
self.ctxt.set_bool_option(gccjit.BoolOption.DUMP_GENERATED_CODE,
0);
self.ctxt.set_bool_option(gccjit.BoolOption.DEBUGINFO,
1);
self.ctxt.set_bool_option(gccjit.BoolOption.DUMP_EVERYTHING,
0);
self.ctxt.set_bool_option(gccjit.BoolOption.KEEP_INTERMEDIATES,
0);
self.void_type = self.ctxt.get_type(gccjit.TypeKind.VOID)
self.int_type = self.ctxt.get_type(gccjit.TypeKind.INT)
self.byte_type = self.ctxt.get_type(gccjit.TypeKind.UNSIGNED_CHAR)
self.array_type = self.ctxt.new_array_type(self.byte_type,
30000)
self.func_getchar = (
self.ctxt.new_function(gccjit.FunctionKind.IMPORTED,
self.int_type,
b"getchar", []))
self.func_putchar = (
self.ctxt.new_function(gccjit.FunctionKind.IMPORTED,
self.void_type,
b"putchar",
[self.ctxt.new_param(self.int_type,
b"c")]))
self.func = self.ctxt.new_function(gccjit.FunctionKind.EXPORTED,
self.void_type, b'func', [])
self.curblock = self.func.new_block(b"initial")
self.int_zero = self.ctxt.zero(self.int_type)
self.int_one = self.ctxt.one(self.int_type)
self.byte_zero = self.ctxt.zero(self.byte_type)
self.byte_one = self.ctxt.one(self.byte_type)
self.data_cells = self.ctxt.new_global(gccjit.GlobalKind.INTERNAL,
self.array_type,
b"data_cells")
self.idx = self.func.new_local(self.int_type,
b"idx")
self.open_parens = []
self.curblock.add_comment(b"idx = 0;")
self.curblock.add_assignment(self.idx,
self.int_zero)
def get_current_data(self, loc):
"""Get 'data_cells[idx]' as an lvalue. """
return self.ctxt.new_array_access(self.data_cells,
self.idx,
loc)
def current_data_is_zero(self, loc):
"""Get 'data_cells[idx] == 0' as a boolean rvalue."""
return self.ctxt.new_comparison(gccjit.Comparison.EQ,
self.get_current_data(loc),
self.byte_zero,
loc)
def compile_char(self, ch):
"""Compile one bf character."""
loc = self.ctxt.new_location(self.filename,
self.line,
self.column)
# Turn this on to trace execution, by injecting putchar()
# of each source char.
if 0:
arg = self.ctxt.new_rvalue_from_int (self.int_type,
ch)
call = self.ctxt.new_call (self.func_putchar,
[arg],
loc)
self.curblock.add_eval (call, loc)
if ch == '>':
self.curblock.add_comment(b"'>': idx += 1;", loc)
self.curblock.add_assignment_op(self.idx,
gccjit.BinaryOp.PLUS,
self.int_one,
loc)
elif ch == '<':
self.curblock.add_comment(b"'<': idx -= 1;", loc)
self.curblock.add_assignment_op(self.idx,
gccjit.BinaryOp.MINUS,
self.int_one,
loc)
elif ch == '+':
self.curblock.add_comment(b"'+': data[idx] += 1;", loc)
self.curblock.add_assignment_op(self.get_current_data (loc),
gccjit.BinaryOp.PLUS,
self.byte_one,
loc)
elif ch == '-':
self.curblock.add_comment(b"'-': data[idx] -= 1;", loc)
self.curblock.add_assignment_op(self.get_current_data(loc),
gccjit.BinaryOp.MINUS,
self.byte_one,
loc)
elif ch == '.':
arg = self.ctxt.new_cast(self.get_current_data(loc),
self.int_type,
loc)
call = self.ctxt.new_call(self.func_putchar,
[arg],
loc)
self.curblock.add_comment(b"'.': putchar ((int)data[idx]);",
loc)
self.curblock.add_eval(call, loc)
elif ch == ',':
call = self.ctxt.new_call(self.func_getchar, [], loc)
self.curblock.add_comment(b"',': data[idx] = (unsigned char)getchar ();",
loc)
self.curblock.add_assignment(self.get_current_data(loc),
self.ctxt.new_cast(call,
self.byte_type,
loc),
loc)
elif ch == '[':
loop_test = self.func.new_block()
on_zero = self.func.new_block()
on_non_zero = self.func.new_block()
self.curblock.end_with_jump(loop_test, loc)
loop_test.add_comment(b"'['", loc)
loop_test.end_with_conditional(self.current_data_is_zero(loc),
on_zero,
on_non_zero,
loc)
self.open_parens.append(Paren(loop_test, on_non_zero, on_zero))
self.curblock = on_non_zero;
elif ch == ']':
self.curblock.add_comment(b"']'", loc)
if not self.open_parens:
raise CompileError(self, "mismatching parens")
paren = self.open_parens.pop()
self.curblock.end_with_jump(paren.b_test)
self.curblock = paren.b_after
elif ch == '\n':
self.line +=1;
self.column = 0;
if ch != '\n':
self.column += 1
def parse_into_ctxt(self, filename):
"""
Parse the given .bf file into the gccjit.Context, containing a
single "main" function suitable for compiling into an executable.
"""
self.filename = filename;
self.line = 1
self.column = 0
with open(filename) as f_in:
for ch in f_in.read():
self.compile_char(ch)
self.curblock.end_with_void_return()
# Compiling to an executable
def compile_to_file(self, output_path):
# Wrap "func" up in a "main" function
mainfunc, argv, argv = gccjit.make_main(self.ctxt)
block = mainfunc.new_block()
block.add_eval(self.ctxt.new_call(self.func, []))
block.end_with_return(self.int_zero)
self.ctxt.compile_to_file(gccjit.OutputKind.EXECUTABLE,
output_path)
# Running the generated code in-process
def run(self):
import ctypes
result = self.ctxt.compile()
py_func_type = ctypes.CFUNCTYPE(None)
py_func = py_func_type(result.get_code(b'func'))
py_func()
# Entrypoint
def main(argv):
from optparse import OptionParser
parser = OptionParser()
parser.add_option("-o", "--output", dest="outputfile",
help="compile to FILE", metavar="FILE")
(options, args) = parser.parse_args()
if len(args) != 1:
raise ValueError('No input file')
inputfile = args[0]
c = Compiler()
c.parse_into_ctxt(inputfile)
if options.outputfile:
c.compile_to_file(options.outputfile)
else:
c.run()
if __name__ == '__main__':
try:
main(sys.argv)
except Exception as exc:
print(exc)
sys.exit(1)
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