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583 行
15 KiB
583 行
15 KiB
/*
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* CS:APP Data Lab
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*
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* btest.c - A test harness that checks a student's solution in bits.c
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* for correctness.
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*
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* Copyright (c) 2001-2011, R. Bryant and D. O'Hallaron, All rights
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* reserved. May not be used, modified, or copied without permission.
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*
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* This is an improved version of btest that tests large windows
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* around zero and tmin and tmax for integer puzzles, and zero, norm,
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* and denorm boundaries for floating point puzzles.
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*
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* Note: not 64-bit safe. Always compile with gcc -m32 option.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <math.h>
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#include "btest.h"
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/* Not declared in some stdlib.h files, so define here */
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float strtof(const char *nptr, char **endptr);
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/*************************
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* Configuration Constants
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*************************/
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/* Handle infinite loops by setting upper limit on execution time, in
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seconds */
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#define TIMEOUT_LIMIT 10
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/* For functions with a single argument, generate TEST_RANGE values
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above and below the min and max test values, and above and below
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zero. Functions with two or three args will use square and cube
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roots of this value, respectively, to avoid combinatorial
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explosion */
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#define TEST_RANGE 500000
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/* This defines the maximum size of any test value array. The
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gen_vals() routine creates k test values for each value of
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TEST_RANGE, thus MAX_TEST_VALS must be at least k*TEST_RANGE */
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#define MAX_TEST_VALS 13*TEST_RANGE
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/**********************************
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* Globals defined in other modules
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**********************************/
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/* This characterizes the set of puzzles to test.
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Defined in decl.c and generated from templates in ./puzzles dir */
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extern test_rec test_set[];
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/************************************************
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* Write-once globals defined by command line args
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************************************************/
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/* Emit results in a format for autograding, without showing
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and counter-examples */
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static int grade = 0;
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/* Time out after this number of seconds */
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static int timeout_limit = TIMEOUT_LIMIT; /* -T */
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/* If non-NULL, test only one function (-f) */
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static char* test_fname = NULL;
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/* Special case when only use fixed argument(s) (-1, -2, or -3) */
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static int has_arg[3] = {0,0,0};
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static unsigned argval[3] = {0,0,0};
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/* Use fixed weight for rating, and if so, what should it be? (-r) */
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static int global_rating = 0;
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/******************
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* Helper functions
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******************/
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/*
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* Signal - installs a signal handler
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*/
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typedef void handler_t(int);
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handler_t *Signal(int signum, handler_t *handler)
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{
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struct sigaction action, old_action;
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action.sa_handler = handler;
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sigemptyset(&action.sa_mask); /* block sigs of type being handled */
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action.sa_flags = SA_RESTART; /* restart syscalls if possible */
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if (sigaction(signum, &action, &old_action) < 0)
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perror("Signal error");
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return (old_action.sa_handler);
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}
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/*
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* timeout_handler - SIGALARM hander
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*/
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sigjmp_buf envbuf;
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void timeout_handler(int sig) {
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siglongjmp(envbuf, 1);
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}
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/*
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* random_val - Return random integer value between min and max
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*/
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static int random_val(int min, int max)
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{
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double weight = rand()/(double) RAND_MAX;
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int result = min * (1-weight) + max * weight;
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return result;
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}
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/*
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* gen_vals - Generate the integer values we'll use to test a function
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*/
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static int gen_vals(int test_vals[], int min, int max, int test_range, int arg)
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{
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int i;
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int test_count = 0;
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/* Special case: If the user has specified a specific function
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argument using the -1, -2, or -3 flags, then simply use this
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argument and return */
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if (has_arg[arg]) {
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test_vals[0] = argval[arg];
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return 1;
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}
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/*
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* Special case: Generate test vals for floating point functions
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* where the input argument is an unsigned bit-level
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* representation of a float. For this case we want to test the
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* regions around zero, the smallest normalized and largest
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* denormalized numbers, one, and the largest normalized number,
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* as well as inf and nan.
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*/
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if ((min == 1 && max == 1)) {
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unsigned smallest_norm = 0x00800000;
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unsigned one = 0x3f800000;
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unsigned largest_norm = 0x7f000000;
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unsigned inf = 0x7f800000;
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unsigned nan = 0x7fc00000;
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unsigned sign = 0x80000000;
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/* Test range should be at most 1/2 the range of one exponent
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value */
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if (test_range > (1 << 23)) {
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test_range = 1 << 23;
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}
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/* Functions where the input argument is an unsigned bit-level
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representation of a float. The number of tests generated
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inside this loop body is the value k referenced in the
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comment for the global variable MAX_TEST_VALS. */
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for (i = 0; i < test_range; i++) {
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/* Denorms around zero */
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test_vals[test_count++] = i;
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test_vals[test_count++] = sign | i;
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/* Region around norm to denorm transition */
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test_vals[test_count++] = smallest_norm + i;
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test_vals[test_count++] = smallest_norm - i;
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test_vals[test_count++] = sign | (smallest_norm + i);
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test_vals[test_count++] = sign | (smallest_norm - i);
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/* Region around one */
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test_vals[test_count++] = one + i;
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test_vals[test_count++] = one - i;
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test_vals[test_count++] = sign | (one + i);
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test_vals[test_count++] = sign | (one - i);
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/* Region below largest norm */
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test_vals[test_count++] = largest_norm - i;
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test_vals[test_count++] = sign | (largest_norm - i);
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}
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/* special vals */
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test_vals[test_count++] = inf; /* inf */
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test_vals[test_count++] = sign | inf; /* -inf */
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test_vals[test_count++] = nan; /* nan */
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test_vals[test_count++] = sign | nan; /* -nan */
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return test_count;
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}
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/*
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* Normal case: Generate test vals for integer functions
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*/
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/* If the range is small enough, then do exhaustively */
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if (max - MAX_TEST_VALS <= min) {
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for (i = min; i <= max; i++)
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test_vals[test_count++] = i;
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return test_count;
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}
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/* Otherwise, need to sample. Do so near the boundaries, around
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zero, and for some random cases. */
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for (i = 0; i < test_range; i++) {
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/* Test around the boundaries */
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test_vals[test_count++] = min + i;
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test_vals[test_count++] = max - i;
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/* If zero falls between min and max, then also test around zero */
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if (i >= min && i <= max)
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test_vals[test_count++] = i;
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if (-i >= min && -i <= max)
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test_vals[test_count++] = -i;
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/* Random case between min and max */
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test_vals[test_count++] = random_val(min, max);
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}
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return test_count;
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}
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/*
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* test_0_arg - Test a function with zero arguments
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*/
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static int test_0_arg(funct_t f, funct_t ft, char *name)
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{
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int r = f();
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int rt = ft();
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int error = (r != rt);
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if (error && !grade)
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printf("ERROR: Test %s() failed...\n...Gives %d[0x%x]. Should be %d[0x%x]\n", name, r, r, rt, rt);
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return error;
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}
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/*
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* test_1_arg - Test a function with one argument
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*/
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static int test_1_arg(funct_t f, funct_t ft, int arg1, char *name)
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{
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funct1_t f1 = (funct1_t) f;
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funct1_t f1t = (funct1_t) ft;
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int r, rt, error;
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r = f1(arg1);
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rt = f1t(arg1);
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error = (r != rt);
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if (error && !grade)
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printf("ERROR: Test %s(%d[0x%x]) failed...\n...Gives %d[0x%x]. Should be %d[0x%x]\n", name, arg1, arg1, r, r, rt, rt);
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return error;
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}
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/*
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* test_2_arg - Test a function with two arguments
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*/
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static int test_2_arg(funct_t f, funct_t ft, int arg1, int arg2, char *name)
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{
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funct2_t f2 = (funct2_t) f;
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funct2_t f2t = (funct2_t) ft;
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int r = f2(arg1, arg2);
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int rt = f2t(arg1, arg2);
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int error = (r != rt);
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if (error && !grade)
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printf("ERROR: Test %s(%d[0x%x],%d[0x%x]) failed...\n...Gives %d[0x%x]. Should be %d[0x%x]\n", name, arg1, arg1, arg2, arg2, r, r, rt, rt);
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return error;
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}
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/*
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* test_3_arg - Test a function with three arguments
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*/
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static int test_3_arg(funct_t f, funct_t ft,
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int arg1, int arg2, int arg3, char *name)
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{
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funct3_t f3 = (funct3_t) f;
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funct3_t f3t = (funct3_t) ft;
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int r = f3(arg1, arg2, arg3);
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int rt = f3t(arg1, arg2, arg3);
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int error = (r != rt);
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if (error && !grade)
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printf("ERROR: Test %s(%d[0x%x],%d[0x%x],%d[0x%x]) failed...\n...Gives %d[0x%x]. Should be %d[0x%x]\n", name, arg1, arg1, arg2, arg2, arg3, arg3, r, r, rt, rt);
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return error;
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}
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/*
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* test_function - Test a function. Return number of errors
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*/
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static int test_function(test_ptr t) {
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int test_counts[3]; /* number of test values for each arg */
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int args = t->args; /* number of function arguments */
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int arg_test_range[3]; /* test range for each argument */
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int i, a1, a2, a3;
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int errors = 0;
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/* These are the test values for each arg. Declared with the
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static attribute so that the array will be allocated in bss
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rather than the stack */
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static int arg_test_vals[3][MAX_TEST_VALS];
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/* Sanity check on the number of args */
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if (args < 0 || args > 3) {
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printf("Configuration error: invalid number of args (%d) for function %s\n", args, t->name);
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exit(1);
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}
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/* Assign range of argument test vals so as to conserve the total
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number of tests, independent of the number of arguments */
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if (args == 1) {
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arg_test_range[0] = TEST_RANGE;
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}
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else if (args == 2) {
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arg_test_range[0] = pow((double)TEST_RANGE, 0.5); /* sqrt */
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arg_test_range[1] = arg_test_range[0];
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}
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else {
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arg_test_range[0] = pow((double)TEST_RANGE, 0.333); /* cbrt */
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arg_test_range[1] = arg_test_range[0];
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arg_test_range[2] = arg_test_range[0];
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}
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/* Sanity check on the ranges */
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if (arg_test_range[0] < 1)
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arg_test_range[0] = 1;
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if (arg_test_range[1] < 1)
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arg_test_range[1] = 1;
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if (arg_test_range[2] < 1)
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arg_test_range[2] = 1;
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/* Create a test set for each argument */
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for (i = 0; i < args; i++) {
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test_counts[i] = gen_vals(arg_test_vals[i],
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t->arg_ranges[i][0], /* min */
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t->arg_ranges[i][1], /* max */
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arg_test_range[i],
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i);
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}
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/* Handle timeouts in the test code */
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if (timeout_limit > 0) {
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int rc;
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rc = sigsetjmp(envbuf, 1);
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if (rc) {
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/* control will reach here if there is a timeout */
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errors = 1;
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printf("ERROR: Test %s failed.\n Timed out after %d secs (probably infinite loop)\n", t->name, timeout_limit);
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return errors;
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}
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alarm(timeout_limit);
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}
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/* Test function has no arguments */
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if (args == 0) {
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errors += test_0_arg(t->solution_funct, t->test_funct, t->name);
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return errors;
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}
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/*
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* Test function has at least one argument
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*/
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/* Iterate over the values for first argument */
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for (a1 = 0; a1 < test_counts[0]; a1++) {
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if (args == 1) {
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errors += test_1_arg(t->solution_funct,
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t->test_funct,
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arg_test_vals[0][a1],
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t->name);
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/* Stop testing if there is an error */
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if (errors)
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return errors;
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}
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else {
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/* if necessary, iterate over values for second argument */
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for (a2 = 0; a2 < test_counts[1]; a2++) {
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if (args == 2) {
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errors += test_2_arg(t->solution_funct,
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t->test_funct,
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arg_test_vals[0][a1],
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arg_test_vals[1][a2],
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t->name);
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/* Stop testing if there is an error */
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if (errors)
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return errors;
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}
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else {
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/* if necessary, iterate over vals for third arg */
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for (a3 = 0; a3 < test_counts[2]; a3++) {
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errors += test_3_arg(t->solution_funct,
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t->test_funct,
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arg_test_vals[0][a1],
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arg_test_vals[1][a2],
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arg_test_vals[2][a3],
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t->name);
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/* Stop testing if there is an error */
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if (errors)
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return errors;
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} /* a3 */
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}
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} /* a2 */
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}
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} /* a1 */
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return errors;
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}
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/*
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* run_tests - Run series of tests. Return number of errors
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*/
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static int run_tests()
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{
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int i;
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int errors = 0;
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double points = 0.0;
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double max_points = 0.0;
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printf("Score\tRating\tErrors\tFunction\n");
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for (i = 0; test_set[i].solution_funct; i++) {
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int terrors;
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double tscore;
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double tpoints;
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if (!test_fname || strcmp(test_set[i].name,test_fname) == 0) {
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int rating = global_rating ? global_rating : test_set[i].rating;
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terrors = test_function(&test_set[i]);
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errors += terrors;
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tscore = terrors == 0 ? 1.0 : 0.0;
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tpoints = rating * tscore;
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points += tpoints;
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max_points += rating;
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if (grade || terrors < 1)
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printf(" %.0f\t%d\t%d\t%s\n",
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tpoints, rating, terrors, test_set[i].name);
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}
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}
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printf("Total points: %.0f/%.0f\n", points, max_points);
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return errors;
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}
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/*
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* get_num_val - Extract hex/decimal/or float value from string
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*/
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static int get_num_val(char *sval, unsigned *valp) {
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char *endp;
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/* See if it's an integer or floating point */
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int ishex = 0;
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int isfloat = 0;
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int i;
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for (i = 0; sval[i]; i++) {
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switch (sval[i]) {
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case 'x':
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case 'X':
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ishex = 1;
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break;
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case 'e':
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case 'E':
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if (!ishex)
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isfloat = 1;
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break;
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case '.':
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isfloat = 1;
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break;
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default:
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break;
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}
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}
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if (isfloat) {
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float fval = strtof(sval, &endp);
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if (!*endp) {
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*valp = *(unsigned *) &fval;
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return 1;
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}
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return 0;
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} else {
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long long int llval = strtoll(sval, &endp, 0);
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long long int upperbits = llval >> 31;
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/* will give -1 for negative, 0 or 1 for positive */
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if (!*valp && (upperbits == 0 || upperbits == -1 || upperbits == 1)) {
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*valp = (unsigned) llval;
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return 1;
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}
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return 0;
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}
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}
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/*
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* usage - Display usage info
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*/
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static void usage(char *cmd) {
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printf("Usage: %s [-hg] [-r <n>] [-f <name> [-1|-2|-3 <val>]*] [-T <time limit>]\n", cmd);
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printf(" -1 <val> Specify first function argument\n");
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printf(" -2 <val> Specify second function argument\n");
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printf(" -3 <val> Specify third function argument\n");
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printf(" -f <name> Test only the named function\n");
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printf(" -g Compact output for grading (with no error msgs)\n");
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printf(" -h Print this message\n");
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printf(" -r <n> Give uniform weight of n for all problems\n");
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|
printf(" -T <lim> Set timeout limit to lim\n");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
/**************
|
|
* Main routine
|
|
**************/
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
char c;
|
|
|
|
/* parse command line args */
|
|
while ((c = getopt(argc, argv, "hgf:r:T:1:2:3:")) != -1)
|
|
switch (c) {
|
|
case 'h': /* help */
|
|
usage(argv[0]);
|
|
break;
|
|
case 'g': /* grading option for autograder */
|
|
grade = 1;
|
|
break;
|
|
case 'f': /* test only one function */
|
|
test_fname = strdup(optarg);
|
|
break;
|
|
case 'r': /* set global rating for each problem */
|
|
global_rating = atoi(optarg);
|
|
if (global_rating < 0)
|
|
usage(argv[0]);
|
|
break;
|
|
case '1': /* Get first argument */
|
|
has_arg[0] = get_num_val(optarg, &argval[0]);
|
|
if (!has_arg[0]) {
|
|
printf("Bad argument '%s'\n", optarg);
|
|
exit(0);
|
|
}
|
|
break;
|
|
case '2': /* Get first argument */
|
|
has_arg[1] = get_num_val(optarg, &argval[1]);
|
|
if (!has_arg[1]) {
|
|
printf("Bad argument '%s'\n", optarg);
|
|
exit(0);
|
|
}
|
|
break;
|
|
case '3': /* Get first argument */
|
|
has_arg[2] = get_num_val(optarg, &argval[2]);
|
|
if (!has_arg[2]) {
|
|
printf("Bad argument '%s'\n", optarg);
|
|
exit(0);
|
|
}
|
|
break;
|
|
case 'T': /* Set timeout limit */
|
|
timeout_limit = atoi(optarg);
|
|
break;
|
|
default:
|
|
usage(argv[0]);
|
|
}
|
|
|
|
if (timeout_limit > 0) {
|
|
Signal(SIGALRM, timeout_handler);
|
|
}
|
|
|
|
/* test each function */
|
|
run_tests();
|
|
|
|
return 0;
|
|
}
|