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compile.py
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compile.py
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#!/usr/bin/python
#compile.py
# Anne Gatchell
# CSCI 5525
"""
Usage: compile.py <file_name>
"""
import sys
import compiler
from compiler.ast import *
from x86ast import *
from parse import parse_file
print_stmts = 0
temp_counter = -1
def temp_gen(basename):
global temp_counter
temp_counter += 1
return basename + str(temp_counter)
def is_leaf(ast):
return isinstance(ast, Const) or isinstance(ast, Name)
def flatten(ast):
if isinstance(ast,Module):
if(print_stmts):
print 'IN MODULE', Module(ast.doc, flatten(ast.node))
return Module(ast.doc, flatten(ast.node))
elif isinstance(ast,Stmt):
#print 'STMT'
fnodes = []
fnodes = map(flatten, ast.nodes)
#print 'fnodes before sum', fnodes
fnodes = sum(fnodes, [])
#print 'fnodes after sum',fnodes
if(print_stmts):
print 'IN STMT',Stmt(fnodes)
return Stmt(fnodes)
elif isinstance(ast, Printnl):
nodes = map(flatten, ast.nodes)
prints = []
for (t,l) in nodes:
if not is_leaf(t):
temp = temp_gen('print')
l.append(Assign([AssName(temp, 'OP_ASSIGN')], t))
prints.append(Name(temp))
else:
prints.append(t)
stmts = sum([l for (t, l) in nodes], [])
if(print_stmts):
print 'IN PRINT STATEMENTS',stmts + [Printnl(prints, ast.dest)]
return stmts + [Printnl(prints, ast.dest)]
elif isinstance(ast, Assign):
#print 'ASSIGN'
#print 'assign',ast
fnodes = map(flatten, ast.nodes)
assigns = [t for (t, l) in fnodes]
stmts = sum([l for (t, l) in fnodes], [])
targ_node, targ_stmts = flatten(ast.expr)
if(print_stmts):
print 'IN ASSIGN',(stmts + targ_stmts + [Assign(assigns, targ_node)])
return stmts + targ_stmts + [Assign(assigns, targ_node)]
elif isinstance(ast, AssName):
#print 'ASSNAME'
if(print_stmts):
print 'IN ASS NAME',(ast, [])
return (ast,[])
elif isinstance(ast, Discard):
#print 'DISCARD'
expr, stmts = flatten(ast.expr)
if(print_stmts):
print 'IN DISCARD', stmts + [Discard(expr)]
return stmts + [Discard(expr)]
elif isinstance(ast, Const):
if(print_stmts):
print 'IN THE CONST', (ast,[])
return (ast,[])
elif isinstance(ast, Name):
if(print_stmts):
print 'IN THE NAME', (ast, [])
return (ast, [])
elif isinstance(ast, Add):
#print 'ADD'
lexpr, lstmts = flatten(ast.left)
rexpr, rstmts = flatten(ast.right)
if not is_leaf(lexpr):
temp = temp_gen("left")
lstmts.append(Assign([AssName(temp, 'OP_ASSIGN')], lexpr))
lexpr = Name(temp)
if not is_leaf(rexpr):
temp = temp_gen("right")
rstmts.append(Assign([AssName(temp, 'OP_ASSIGN')], rexpr))
rexpr = Name(temp)
if(print_stmts):
print 'IN THE ADD',(Add((lexpr, rexpr)), lstmts + rstmts)
return (Add((lexpr, rexpr)), lstmts + rstmts)
elif isinstance(ast, UnarySub):
#print 'UNARYSUB'
expr, stmts = flatten(ast.expr)
if not is_leaf(expr):
temp = temp_gen("usub")
stmts.append(Assign([AssName(temp, 'OP_ASSIGN')], expr))
expr = Name(temp)
if(print_stmts):
print 'IN THE UNARYSUB',(UnarySub(expr), stmts)
return (UnarySub(expr), stmts)
elif isinstance(ast, CallFunc):
#print 'CALLFUNC'
expr, stmts = flatten(ast.node)
if not is_leaf(expr):
temp = temp_gen("func")
stmts.append(Assign([AssName(temp, 'OP_ASSIGN')], expr))
expr = Name(temp)
args_exprs = []
args_stmts = []
for arg in ast.args:
arg_expr, arg_stmts = flatten(arg)
if not is_leaf(arg_expr):
temp = temp_gen("arg")
arg_stmts.append(Assign([AssName(temp, 'OP_ASSIGN')], arg_expr))
arg_expr = Name(temp)
args_exprs.append(arg_expr)
args_stmts = args_stmts + arg_stmts
if(print_stmts):
print 'IN THE CALLFUNC', (CallFunc(expr, args_exprs), stmts + args_stmts)
return (CallFunc(expr, args_exprs), stmts + args_stmts)
else:
raise Exception('Error in flatten: unrecognized AST node'+ str(ast))
def scan_allocs(ast):
if isinstance(ast, Module):
return scan_allocs(ast.node)
elif isinstance(ast, Stmt):
return reduce(lambda x,y: x.union(y), map(scan_allocs, ast.nodes), set([]))
elif isinstance(ast, Assign):
return reduce(lambda x,y: x.union(y), map(scan_allocs, ast.nodes), set([]))
elif isinstance(ast, AssName):
return set([ast.name])
else:
return set([])
current_offset = 0
stack_map = {}
def allocate(var, size):
global current_offset, stack_map
if var in stack_map:
return stack_map[var]
current_offset = size + current_offset
stack_map[var] = current_offset
return current_offset
# Mike's Instruction Select
EAX = Reg86('eax')
EBP = Reg86('ebp')
ESP = Reg86('esp')
def instr_select(ast, value_mode=Move86):
global stack_map
if isinstance(ast, Module):
return [Push86(EBP), Move86(ESP, EBP), Sub86(Const86(len(scan_allocs(ast)) * 4), ESP)] + instr_select(ast.node) + [Move86(Const86(0), EAX), Leave86(), Ret86()]
elif isinstance(ast, Stmt):
return sum(map(instr_select, ast.nodes),[])
elif isinstance(ast, Printnl):
return instr_select(ast.nodes[0]) + [Push86(EAX), Call86('print_int_nl'), Add86(Const86(4), ESP)]
elif isinstance(ast, Assign):
expr_assemb = instr_select(ast.expr)
offset = allocate(ast.nodes[0].name, 4)
return expr_assemb + [Move86(EAX, Mem86(offset, EBP))]
elif isinstance(ast, Discard):
return instr_select(ast.expr)
elif isinstance(ast, Add):
return instr_select(ast.left) + instr_select(ast.right, value_mode=Add86)
elif isinstance(ast, UnarySub):
return instr_select(ast.expr) + [Neg86(EAX)]
elif isinstance(ast, CallFunc):
return [Call86('input')]
elif isinstance(ast, Const):
return [value_mode(Const86(ast.value), EAX)]
elif isinstance(ast, Name):
return [value_mode(Mem86(stack_map[ast.name], EBP), EAX)]
else:
raise Exception("Unexpected term: " + str(ast))
word_size = 4
def compile_stmt(ast, value_mode='movl'):
global stack_map
if isinstance(ast, Module):
header = ['pushl %ebp',
'movl %esp, %ebp',
('subl $%d, %%esp' % (len(scan_allocs(ast)) * word_size))]
footer = ['movl $0, %eax', 'leave', 'ret']
return header + compile_stmt(ast.node) + footer
elif isinstance(ast, Stmt):
return sum(map(compile_stmt, ast.nodes),[])
elif isinstance(ast, Printnl):
return compile_stmt(ast.nodes[0]) + ['pushl %eax',
'call print_int_nl',
('addl $%d, %%esp' % word_size)]
elif isinstance(ast, Assign):
expr_assemb = compile_stmt(ast.expr)
offset = allocate(ast.nodes[0].name, word_size)
return expr_assemb + [('movl %%eax, -%d(%%ebp)' % offset)]
elif isinstance(ast, Discard):
return compile_stmt(ast.expr)
elif isinstance(ast, Add):
return compile_stmt(ast.left) + compile_stmt(ast.right, value_mode='addl')
elif isinstance(ast, UnarySub):
return ['negl %eax']
elif isinstance(ast, CallFunc):
return ['call input']
elif isinstance(ast, Const):
return [('%s $%d, %%eax' % (value_mode, ast.value))]
elif isinstance(ast, Name):
return [('%s -%d(%%ebp), %%eax' % (value_mode, stack_map[ast.name]))]
else:
raise Exception("Unexpected term: " + str(ast))
def write_to_file(assembly, outputFileName):
"""Function to write assembly to file"""
assembly = '.globl main\nmain:\n\t' + '\n\t'.join(assembly)
outputfile = open(outputFileName, 'w+')
outputfile.write(assembly + '\n')
outputfile.close()
def main():
platform = sys.platform
#print 'Running on a',platform
if(len(sys.argv) != 2):
sys.stderr.write(str(argv[0]) + " requires two arguments\n")
return 1;
inputFile = sys.argv[1]
inputFilePath = str(sys.argv[1])
if(inputFilePath[-3:] != ".py"):
sys.stderr.write(str(argv[0]) + " input file must be of type *.py\n")
return 1
outputFilePath = inputFilePath.split('/')
outputFileName = (outputFilePath[-1:])[0]
outputFileName = outputFileName[:-3] + ".s"
#print inputFile
#ast = compiler.parseFile(inputFile);
if(print_stmts):
print 'compile'+inputFilePath
ast = parse_file(inputFilePath);
if(print_stmts):
print ast, '\n\n\n'
fast = flatten(ast)
#print 'flatten(ast)\n',fast
if(print_stmts):
print fast
assembly = instr_select(fast)
if(print_stmts):
print assembly
write_to_file(map(str, assembly), outputFileName)
return 0
if __name__ == '__main__':
main();