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f4codegen.py
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from f4type import inferType, getElementType
__author__ = 'hyst329'
_main = ""
_indent = 0
c_types = {
'INT': 'int',
'REAL': 'double',
'CHAR': 'char',
'STRING': 'char*',
'STR': 'char*'
}
fspec = {
'INT': 'd',
'REAL': 'lf',
'CHAR': 'c',
'STRING': 's',
'STR': 's'
}
varmap = {}
funmap = {}
BLANKOP = ("BLANK", )
def generate_c(res, file):
global _main, _indent
_indent = 0
print("Generating C file...")
file.write('#include "f4helen.h"\n')
_main = "int main()\n{\n"
_indent = 1
for stat in res:
traverse(stat, file)
_main += "}\n"
file.write(_main)
file.close()
print("Generating done")
def traverse(stat, file, cur_fun=None, with_semi=True, with_endline=True):
global _main, _indent
in_main = not cur_fun
if stat == BLANKOP:
return
end = ";" if with_semi else ""
if with_semi:
_write_indent(file, in_main)
print(stat)
cmd = stat[0]
if cmd == 'NEW':
_write(c_types[stat[1]] + ' ', file, in_main)
_write(stat[2] + " = ", file, in_main)
_write(_expr(stat[3]), file, in_main)
_write(end, file, in_main)
varmap[stat[2]] = stat[1]
elif cmd == 'NEWARR':
# _write(c_types[stat[1]] + ' ', file, in_main)
# _write(stat[3] + "[", file, in_main)
# _write(_expr(stat[2]), file, in_main)
# _write(']' + end, file, in_main)
_write("f4_array* " + stat[3] + " = f4_new('", file, in_main)
_write(fspec[stat[1]] + "', " + _expr(stat[2]) + ")" + end, file, in_main)
varmap[stat[3]] = stat[1] + '.0'
elif cmd == "MOV":
var = stat[1][0]
if stat[1][0] == 'ELEM':
# var = stat[1][1] + "->array[" + _expr(stat[1][2]) + " - 1]"
var = "((" + c_types[getElementType(varmap[stat[1][1]])] + "*)(" + \
stat[1][1] + "->array))[" + _expr(stat[1][2]) + " - 1]"
_write(var + " = ", file, in_main)
_write(_expr(stat[2]), file, in_main)
_write(end, file, in_main)
elif cmd == "OUT":
_write('f4_out("%' + fspec.get(inferType(stat[1], varmap, funmap), 'a')
+ '\\n", ' + _expr(stat[1]) + ")" + end, file, in_main)
elif cmd == "IN":
_write("f4_in('" + fspec[inferType(stat[1], varmap, funmap)] + "', &"
+ _expr(stat[1]) + ")" + end, file, in_main)
elif cmd == "IF":
_write("if (", file, in_main)
_write(_expr(stat[1]) + ")\n", file, in_main)
_write_indent(file, in_main)
_write("{\n", file, in_main)
_indent += 1
for s in stat[2]:
traverse(s, file, cur_fun)
if stat[3] != BLANKOP:
_indent -= 1
_write_indent(file, in_main)
_write("}\n", file, in_main)
_write_indent(file, in_main)
_write("else\n", file, in_main)
_write_indent(file, in_main)
_write("{\n", file, in_main)
_indent += 1
for s in stat[3]:
traverse(s, file, cur_fun)
_indent -= 1
_write_indent(file, in_main)
_write("}", file, in_main)
elif cmd == "LOOP":
_write("for (", file, in_main)
_old_indent = _indent
_indent = 0
traverse(stat[1], file, cur_fun, True, False)
_indent = _old_indent
_write(_expr(stat[2]) + "; ", file, in_main)
traverse(stat[3], file, cur_fun, False, False)
_write(")\n", file, in_main)
_write_indent(file, in_main)
_write("{\n", file, in_main)
_indent += 1
for s in stat[4]:
traverse(s, file, cur_fun)
_indent -= 1
_write_indent(file, in_main)
_write("}", file, in_main)
elif cmd == "FUN":
funmap[stat[1]] = stat[3]
old_in_main = in_main
old_cur_fun = cur_fun
cur_fun = stat[1]
in_main = False
_write(c_types.get(stat[3], "void") + ' ' + stat[1], file, in_main)
_write("(", file, in_main)
for t in stat[2][0:-1]:
_write(c_types[t[0]] + ' ' + t[1] + ', ', file, in_main)
if stat[2]:
_write(c_types[stat[2][-1][0]] + ' ' + stat[2][-1][1], file, in_main)
_write(")\n", file, in_main)
_write("{\n", file, in_main)
for s in stat[4]:
traverse(s, file, cur_fun)
_write("}\n\n", file, in_main)
in_main = old_in_main
cur_fun = old_cur_fun
elif cmd == "DECL":
funmap[stat[1]] = stat[3]
_write("extern " + c_types.get(stat[3], "void") + ' ' + stat[1], file, in_main)
_write("(", file, in_main)
for t in stat[2][0:-1]:
_write(c_types[t[0]] + ' ' + t[1] + ', ', file, in_main)
if stat[2]:
_write(c_types[stat[2][-1][0]] + ' ' + stat[2][-1][1], file, in_main)
_write(")" + end, file, in_main)
pass
elif cmd == "RESIZE":
_write("f4_resize(" + stat[1][1] + ", " + _expr(stat[2]) + ")" + end, file, in_main)
elif cmd == 'RET':
_write("return " + _expr(stat[1]) + end, file, in_main)
elif cmd == "EXPR":
_write(_expr(stat[1]) + end, file, in_main)
if with_endline:
_write('\n', file, in_main)
def _write(str, file, to_main=True):
global _main
if to_main:
_main += str
else:
file.write(str)
def _write_indent(file, to_main=True):
_write(" " * 4 * _indent, file, to_main)
def _expr(expr):
op = expr[0]
if op == 'ADD':
return "(" + _expr(expr[1]) + " + " + _expr(expr[2]) + ")"
elif op == 'SUB':
return "(" + _expr(expr[1]) + " - " + _expr(expr[2]) + ")"
elif op == 'MUL':
return "(" + _expr(expr[1]) + " * " + _expr(expr[2]) + ")"
elif op == 'DIV':
return "(" + _expr(expr[1]) + " / " + _expr(expr[2]) + ")"
elif op == 'EQL':
return "(" + _expr(expr[1]) + " == " + _expr(expr[2]) + ")"
elif op == 'LEQ':
return "(" + _expr(expr[1]) + " <= " + _expr(expr[2]) + ")"
elif op == 'GEQ':
return "(" + _expr(expr[1]) + " >= " + _expr(expr[2]) + ")"
elif op == 'LES':
return "(" + _expr(expr[1]) + " < " + _expr(expr[2]) + ")"
elif op == 'GTR':
return "(" + _expr(expr[1]) + " > " + _expr(expr[2]) + ")"
elif op in ('IND', 'ELEM'):
return "((" + c_types[getElementType(varmap[expr[1]])] + "*)(" + expr[1] + "->array))[" + _expr(
expr[2]) + "- 1]"
elif op == 'NEG':
return "-" + _expr(expr[1])
elif op in ('INT', 'REAL', 'CHAR', 'STR'):
return "(" + c_types[op] + ")(" + _literal(op, expr[1]) + ")"
elif op == 'ID':
return expr[1]
elif op == 'SIZE':
return expr[1] + "->size"
elif op == 'CALL':
ret = expr[1] + "("
for e in expr[2][0:-1]:
ret += _expr(e) + ", "
if expr[2]:
ret += _expr(expr[2][-1])
ret += ")"
return ret
def _literal(type, lit):
r = str(lit)
if type == "CHAR":
r = "'" + r + "'"
elif type in ("STR", "STRING"):
r = '"' + r + '"'
return r