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grade_cpp.py
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grade_cpp.py
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import config, json, cgi, sys, Websheet, re, os
from utils import *
from config import execute
void_functions = []
def grade(reference_solution, student_solution, translate_line, websheet):
cpp_compiler = config.config_jo["cpp_compiler"]
unusable_cppflags = []
# following http://bits.usc.edu/cs103/compile/
default_cppflags = ["-g",
"-Wall", "-Wshadow", "-Wunreachable-code",
"-Wconversion",
"-Wno-sign-compare", "-Wno-write-strings"]
if "clang" in cpp_compiler: # good options, but not in g++
default_cppflags += ["-Wvla", "-Wno-shorten-64-to-32", "-Wno-sign-conversion", "-fsanitize=undefined"]
else:
unusable_cppflags = ["-Wno-array-bounds","-Wno-return-stack-address","-Wunreachable-code"]
# didn't seem to help :(
# default_cppflags += ["-fextended-identifiers", "-finput-charset=UTF-8"]
websheet.unusable_cppflags = unusable_cppflags
# create a temp directory
refdir = config.create_tempdir()
studir = config.create_tempdir()
# put slug.cpp
jail = config.config_jo["java_jail-abspath"]
refcpp = open(jail + refdir + websheet.slug + ".cpp", "w", encoding="utf-8")
refcpp.write(reference_solution)
refcpp.close()
stucpp = open(jail + studir + websheet.slug + ".cpp", "w", encoding="utf-8")
stucpp.write(student_solution)
stucpp.close()
suffix = ""
if websheet.lang == "C++func": suffix = ".o"
compile_list = [cpp_compiler] + websheet.cppflags(default_cppflags)
compile_args = []
if websheet.lang == "C++func":
compile_args += ["-c"]
compile_args += [websheet.slug + ".cpp", "-o", websheet.slug + suffix]
# build reference
if not websheet.example:
os.chdir(jail + refdir)
refcompile = execute(compile_list + compile_args, "")
if (refcompile.stderr != "" or refcompile.returncode != 0
or not os.path.isfile(jail + refdir + websheet.slug + suffix)):
return ("Internal Error (Compiling Reference)",
"cmd:"+pre(" ".join(compile_list))+
"<br>stdout:"+pre(refcompile.stdout)+
"<br>stderr:"+pre(refcompile.stderr)+
"<br>retval:"+pre(str(refcompile.returncode)))
# build student
os.chdir(jail + studir)
stucompile = execute(compile_list + compile_args, "")
result = "<div>Compiling: saving your code as "+tt(websheet.slug+".cpp")
result += " and calling "+tt(" ".join(["compile"] + compile_args))
if stucompile.stdout!="":
result += pre(stucompile.stdout)
result += "</div>"
if (stucompile.stderr != "" or stucompile.returncode != 0
or not os.path.isfile(jail + studir + websheet.slug + suffix)):
msg = re.sub('(\.cpp:)(\d+)(?!\d)',
lambda m : m.group(1)+translate_line(m.group(2)),
stucompile.stderr)
result += "<div>Did not compile. Error message:"+pre(msg)+"</div>"
return ("Syntax Error", result)
if len(websheet.tests)==0:
return ("Internal Error", "No tests defined!")
def example_literal(cpptype):
known = {"int":"0", "double":"0.0", "bool":"false", "char":"'x'", "string":'""', "char*": '(char*)NULL', "char[]": '""'}
if cpptype in known: return known[cpptype]
return None
for test in websheet.tests:
if websheet.lang =='C++func' and test[0]=="check-function":
funcname = test[1]
returntype = test[2]
if (returntype == "void"):
global void_functions
void_functions += [funcname]
argtypes = test[3]
literals = [None] * len(argtypes)
for i in range(len(literals)):
literals[i] = example_literal(argtypes[i])
if literals[i] == None:
return ("Internal Error", tt("need example_literal for " + argtypes[i]))
tester = student_solution
tester += "\n#include <iostream>\n" + returntype + "(*some_unique_identifier)(" + ', '.join(argtypes) + ") = &" + funcname + ";"
tester += "\n" + " void even_uniquer() { " + funcname + "(" + ', '.join(literals) + ");}"
tester += "\n" + "int main() {}\n"
newslug = websheet.slug + "test"
cpp = open(jail + refdir + newslug + ".cpp", "w", encoding="utf-8")
cpp.write(tester)
cpp.close()
compile_list = [cpp_compiler] + websheet.cppflags(default_cppflags)
compile_list += [newslug + ".cpp", "-o", newslug + suffix]
os.chdir(jail + refdir)
refcompile = execute(compile_list, "")
if (refcompile.stderr != "" or refcompile.returncode != 0
or not os.path.isfile(jail + refdir + websheet.slug + suffix)):
text = ("<div><!--"+refcompile.stderr+"-->"+
"You must define a function "
+ tt(funcname) +
( " taking no arguments" if len(argtypes)==0 else
(" taking arguments of types " + tt(", ".join(argtypes))))
+ " and with return type " + tt(returntype) + "</div>")
return ("Failed Tests",
text + "<!--" +
"stdout:"+pre(refcompile.stdout)+
"<br>stderr:"+pre(refcompile.stderr)+
"<br>retval:"+pre(str(refcompile.returncode))
+"-->" )
continue # check-function
if websheet.lang=='C++func' and test[0]=="call-function":
funcname = test[1]
args = test[2]
testline = funcname + "(" + ', '.join(args) + ")"
testmain = "\n#include <iostream>\nint main(){std::cout << std::showpoint << std::boolalpha;"
if funcname not in void_functions: testmain += "std::cout << "
testmain += testline + ";}\n"
stutester = student_solution + testmain
reftester = reference_solution + testmain
newslug = websheet.slug + "test"
compile_list = [cpp_compiler] + websheet.cppflags(default_cppflags)
compile_list += [newslug + ".cpp", "-o", newslug]
if not websheet.example:
cpp = open(jail + refdir + newslug + ".cpp", "w", encoding="utf-8")
# print(reftester)
cpp.write(reftester)
cpp.close()
os.chdir(jail + refdir)
refcompile = execute(compile_list, "")
if (refcompile.stderr != "" or refcompile.returncode != 0
or not os.path.isfile(jail + refdir + newslug)):
return ("Internal Error: Reference Type Check Failed",
"<!--" +
"stdout:"+pre(refcompile.stdout)+
"<br>stderr:"+pre(refcompile.stderr)+
"<br>retval:"+pre(str(refcompile.returncode))
+"-->" )
cpp = open(jail + studir + newslug + ".cpp", "w", encoding="utf-8")
cpp.write(stutester)
cpp.close()
os.chdir(jail + studir)
stucompile = execute(compile_list, "")
if (stucompile.stderr != "" or stucompile.returncode != 0
or not os.path.isfile(jail + refdir + newslug)):
return ("Internal Error: Type Check Failed",
"<!--" +
"stdout:"+pre(stucompile.stdout)+
"<br>stderr:"+pre(stucompile.stderr)+
"<br>retval:"+pre(str(stucompile.returncode))
+"-->" )
# call-function
if funcname in void_functions:
result += "<div>Calling " + tt(testline) + "…</div>"
else:
result += "<div>Printing the result of calling " + tt(testline) + "…</div>"
exename = newslug
stdin = ""
args = []
if websheet.lang=='C++': # normal test, calling main
stdin = ""
args = []
if 'stdin' in test:
stdin = test['stdin']
if 'args' in test:
args = test['args']
title = test.get('title', "") # optional title for test
hidden = test.get('hidden', False) # test IO could be hidden -- to prevent cheating: "if In print Out"
cmd = websheet.slug
if len(args) > 0: cmd += " " + " ".join(args)
result += "<div>"
if title:
result += 'Test <i>%s</i>: ' % title
result += "Running " + tt("./" + cmd)
if stdin and hidden:
result += " on hidden input…"
elif stdin:
result += " on input " + pre(stdin)
else:
result += "…"
result += "</div>"
exename = websheet.slug
cfg = config.config_jo
cmd = [cfg["safeexec-executable-abspath"]]
cmd += ["--chroot_dir", cfg["java_jail-abspath"]]
cmd += ["--exec_dir", "/" + refdir]
cmd += ["--clock", "1"]
cmd += ["--mem", "40000"]
cmd += ["--exec", exename]
cmd += args
if not websheet.example:
runref = execute(cmd, stdin)
if runref.returncode != 0 or not runref.stderr.startswith("OK"):
result += "<div>Reference solution crashed!"
result += "<br>stdout:"+pre(runref.stdout)
result += "stderr:"+pre(runref.stderr)
result += "val:"+pre(str(runref.returncode))
result += "</div>"
return ("Internal Error", result)
cmd = [cfg["safeexec-executable-abspath"]]
cmd += ["--chroot_dir", cfg["java_jail-abspath"]]
cmd += ["--exec_dir", "/" + studir]
cmd += ["--clock", "1"]
cmd += ["--mem", "40000"]
cmd += ["--exec", exename]
cmd += args
runstu = execute(cmd, stdin, flag_badchars = True)
if websheet.slug == "ascii_table":
# this is the unique exercise where a corrcet solution uses a badchar
runstu.stdout = runstu.stdout.replace("\\u007f", chr(127))
if runstu.returncode != 0 or not runstu.stderr.startswith("OK"):
result += "<div>Crashed! "
errmsg = runstu.stderr
if "elapsed time:" in errmsg:
errmsg = errmsg[:errmsg.index("elapsed time:")]
errmsg = errmsg.replace("Command terminated by signal (8: SIGFPE)",
"Floating point exception")
errmsg = errmsg.replace("Command terminated by signal (11: SIGSEGV)",
"Segmentation fault (core dumped)")
if errmsg != "":
result += "Error messages:" + pre(errmsg)
if runstu.stdout != "":
result += "Produced this output:"+pre(runstu.stdout)
# result += "Return code:"+pre(str(runstu.returncode))
result += "</div>"
return ("Sandbox Limit", result)
if websheet.example:
result += "<div>Printed this output:"
result += pre(runstu.stdout) + "</div>"
continue
stucanon = re.sub(' +$', '', runstu.stdout, flags=re.MULTILINE)
refcanon = re.sub(' +$', '', runref.stdout, flags=re.MULTILINE)
if (stucanon == refcanon
or stucanon == refcanon + "\n" and not refcanon.endswith("\n")):
result += "<div>Passed! Printed this correct output:"
result += pre(runstu.stdout, True) + "</div>"
elif stucanon == refcanon + "\n":
result += "<div>Failed! Printed this output:"
result += pre(runstu.stdout, True)
result += "which is almost correct but <i>you printed an extra newline at the end</i>.</div>"
return ("Failed Tests", result)
elif refcanon == stucanon + "\n":
result += "<div>Failed! Printed this output:"
result += pre(runstu.stdout, True)
result += "which is almost correct but <i>you are missing a newline at the end</i>.</div>"
return ("Failed Tests", result)
else:
result += "<div>Failed!"
if not hidden:
result += " Printed this incorrect output:"
result += pre(runstu.stdout, True)
result += "Expected this correct output instead:"
result += pre(runref.stdout, True)
result += "</div>"
return ("Failed Tests", result)
if websheet.example:
return ("Example", result)
else:
result += "<div>Passed all tests!</div>"
return ("Passed", result)