29f6df4488
221220000 张三 Linux zzy 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux 21:39:11 up 20:29, 1 user, load average: 0.31, 0.25, 0.18
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/***************************************************************************************
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* Copyright (c) 2014-2022 Zihao Yu, Nanjing University
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*
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* NEMU is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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*
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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*
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* See the Mulan PSL v2 for more details.
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***************************************************************************************/
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <assert.h>
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#include <string.h>
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// this should be enough
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static char buf[65536] = {};
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static char code_buf[65536 + 128] = {}; // a little larger than `buf`
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static char *code_format =
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"#include <stdio.h>\n"
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"int main() { "
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" unsigned result = %s; "
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" printf(\"%%u\", result); "
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" return 0; "
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"}";
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static inline int choose(int n) {
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return rand() % n;
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}
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static int pos;
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#define _GEN(buf, pos, fmt, ...) (pos += snprintf(buf + pos, sizeof(buf) - pos, fmt, ##__VA_ARGS__))
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#define GEN(fmt, ...) _GEN(buf, pos, fmt, ##__VA_ARGS__)
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#define RAND_NUM_MAX 100
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#define GEN_RAND() GEN("%d", choose(RAND_NUM_MAX))
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#define GEN_OP() do{ \
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switch (choose(4)) { \
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case 0: GEN("+"); break; \
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case 1: GEN("-"); break; \
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case 2: GEN("*"); break; \
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case 3: GEN("/"); break; \
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} \
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} while(0)
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static void _gen_rand_expr(int deepth) {
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if (deepth == 0) {
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GEN_RAND();
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return;
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}
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deepth -= 1;
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switch (choose(3)) {
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case 0: GEN_RAND(); break;
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case 1: GEN("("); _gen_rand_expr(deepth); GEN(")"); break;
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case 2: _gen_rand_expr(deepth); GEN_OP(); _gen_rand_expr(deepth); break;
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default: assert(0);
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}
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for (int i = 0; i < choose(3); i ++) {
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GEN(" ");
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}
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}
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static void gen_rand_expr() {
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buf[0] = '\0';
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pos = 0;
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_gen_rand_expr(choose(10));
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}
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int main(int argc, char *argv[]) {
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int seed = time(0);
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srand(seed);
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int loop = 1;
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if (argc > 1) {
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sscanf(argv[1], "%d", &loop);
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}
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int i;
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for (i = 0; i < loop; i ++) {
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gen_rand_expr();
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sprintf(code_buf, code_format, buf);
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FILE *fp = fopen("/tmp/.code.c", "w");
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assert(fp != NULL);
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fputs(code_buf, fp);
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fclose(fp);
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int ret = system("gcc /tmp/.code.c -o /tmp/.expr -Wall -Werror");
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if (ret != 0) {
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printf("failed to execute gcc\n");
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i ++;
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continue;
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}
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fp = popen("/tmp/.expr", "r");
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assert(fp != NULL);
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int result;
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ret = fscanf(fp, "%d", &result);
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pclose(fp);
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printf("%u %s\n", result, buf);
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}
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return 0;
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}
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