init

leak_detector_c.c

@@ -0,0 +1,194 @@
+#include <stdio.h>
+#include <malloc.h>
+#include <string.h>
+#include "leak_detector_c.h"
+
+// 取消宏定义，使用原始 malloc/calloc/free
+#undef	malloc
+#undef	calloc
+#undef 	free
+
+// 全局链表起始与当前位置指针
+static MEM_LEAK *ptr_start = NULL;
+static MEM_LEAK *ptr_next = NULL;
+
+/*
+ * 将分配的内存信息添加到链表中
+ */
+void add(MEM_INFO alloc_info)
+{
+    MEM_LEAK *mem_leak_info = NULL;
+
+    // 分配一个新的链表节点
+    mem_leak_info = (MEM_LEAK *) malloc(sizeof(MEM_LEAK));
+    mem_leak_info->mem_info.address = alloc_info.address;
+    mem_leak_info->mem_info.size = alloc_info.size;
+    strcpy(mem_leak_info->mem_info.file_name, alloc_info.file_name);
+    mem_leak_info->mem_info.line = alloc_info.line;
+    mem_leak_info->next = NULL;
+
+    // 如果是第一个节点
+    if (ptr_start == NULL) {
+        ptr_start = mem_leak_info;
+        ptr_next = ptr_start;
+    } else {
+        // 添加到链表末尾
+        ptr_next->next = mem_leak_info;
+        ptr_next = ptr_next->next;
+    }
+}
+
+/*
+ * 根据位置索引从链表中删除内存记录
+ */
+void erase(unsigned pos)
+{
+    unsigned index = 0;
+    MEM_LEAK *alloc_info, *temp;
+
+    // 删除第一个节点
+    if (pos == 0) {
+        MEM_LEAK *temp = ptr_start;
+        ptr_start = ptr_start->next;
+        free(temp);
+    } else {
+        // 删除中间或最后一个节点
+        for (index = 0, alloc_info = ptr_start; index < pos; alloc_info = alloc_info->next, ++index) {
+            if (pos == index + 1) {
+                temp = alloc_info->next;
+                alloc_info->next = temp->next;
+                free(temp);
+                break;
+            }
+        }
+    }
+}
+
+/*
+ * 清空链表中所有内存记录
+ */
+void clear()
+{
+    MEM_LEAK *temp = ptr_start;
+    MEM_LEAK *alloc_info = ptr_start;
+
+    while (alloc_info != NULL) {
+        alloc_info = alloc_info->next;
+        free(temp);
+        temp = alloc_info;
+    }
+}
+
+/*
+ * 自定义 malloc 函数：分配内存并记录来源信息
+ */
+void *xmalloc(unsigned int size, const char *file, unsigned int line)
+{
+    void *ptr = malloc(size);
+    if (ptr != NULL) {
+        add_mem_info(ptr, size, file, line);
+    }
+    return ptr;
+}
+
+/*
+ * 自定义 calloc 函数：分配并初始化内存，同时记录信息
+ */
+void *xcalloc(unsigned int elements, unsigned int size, const char *file, unsigned int line)
+{
+    unsigned total_size;
+    void *ptr = calloc(elements, size);
+    if (ptr != NULL) {
+        total_size = elements * size;
+        add_mem_info(ptr, total_size, file, line);
+    }
+    return ptr;
+}
+
+/*
+ * 自定义 free 函数：释放内存前先移除记录
+ */
+void xfree(void *mem_ref)
+{
+    remove_mem_info(mem_ref); // 移除记录
+    free(mem_ref);            // 实际释放
+}
+
+/*
+ * 创建内存分配信息并添加到链表中
+ */
+void add_mem_info(void *mem_ref, unsigned int size, const char *file, unsigned int line)
+{
+    MEM_INFO mem_alloc_info;
+
+    // 清空结构体，确保初始化干净
+    memset(&mem_alloc_info, 0, sizeof(mem_alloc_info));
+    mem_alloc_info.address = mem_ref;
+    mem_alloc_info.size = size;
+    strncpy(mem_alloc_info.file_name, file, FILE_NAME_LENGTH);
+    mem_alloc_info.line = line;
+
+    // 添加到链表中
+    add(mem_alloc_info);
+}
+
+/*
+ * 从链表中移除某段已释放的内存记录
+ */
+void remove_mem_info(void *mem_ref)
+{
+    unsigned short index;
+    MEM_LEAK *leak_info = ptr_start;
+
+    // 遍历链表查找目标地址
+    for (index = 0; leak_info != NULL; ++index, leak_info = leak_info->next) {
+        if (leak_info->mem_info.address == mem_ref) {
+            erase(index); // 找到后删除
+            break;
+        }
+    }
+}
+
+/*
+ * 将所有未释放的内存信息写入输出文件
+ */
+void report_mem_leak(void)
+{
+    MEM_LEAK *leak_info;
+    FILE *fp_write = fopen(OUTPUT_FILE, "wt");
+
+    if (fp_write != NULL) {
+        fprintf(fp_write, "Memory Leak Summary\n");
+        fprintf(fp_write, "-----------------------------------\n");
+
+        // 遍历所有未释放的记录，写入文件
+        for (leak_info = ptr_start; leak_info != NULL; leak_info = leak_info->next) {
+            fprintf(fp_write, "address : %p\n", leak_info->mem_info.address);
+            fprintf(fp_write, "size    : %d bytes\n", leak_info->mem_info.size);
+            fprintf(fp_write, "file    : %s\n", leak_info->mem_info.file_name);
+            fprintf(fp_write, "line    : %d\n", leak_info->mem_info.line);
+            fprintf(fp_write, "-----------------------------------\n");
+        }
+
+        fclose(fp_write); // 关闭输出文件
+    }
+
+    clear(); // 清空链表，释放资源
+}
+
+
+void dump_mem_leak(void)
+{
+    MEM_LEAK *leak_info;
+    
+    fprintf(stderr, "Memory Leak Snapshot\n");
+    fprintf(stderr, "-----------------------------------\n");
+
+    for (leak_info = ptr_start; leak_info != NULL; leak_info = leak_info->next) {
+        fprintf(stderr, "address : %p\n", leak_info->mem_info.address);
+        fprintf(stderr, "size    : %d bytes\n", leak_info->mem_info.size);
+        fprintf(stderr, "file    : %s\n", leak_info->mem_info.file_name);
+        fprintf(stderr, "line    : %d\n", leak_info->mem_info.line);
+        fprintf(stderr, "-----------------------------------\n");
+    }
+}

leak_detector_c.h

@@ -0,0 +1,61 @@
+#ifndef  LEAK_DETECTOR_C_H
+#define  LEAK_DETECTOR_C_H
+
+// 文件名最大长度
+#define  FILE_NAME_LENGTH   	   256
+
+// 内存泄漏信息输出文件
+#define  OUTPUT_FILE			   "leak_info.txt"
+
+// 用宏重定义 malloc、calloc 和 free，为其添加文件名和行号信息
+#define  malloc(size) 	    	   	xmalloc (size, __FILE__, __LINE__)
+#define  calloc(elements, size)  	xcalloc (elements, size, __FILE__, __LINE__)
+#define  free(mem_ref) 		  	 	xfree(mem_ref)
+
+// 用于记录每一次内存分配的信息结构体
+struct _MEM_INFO {
+    void *address;                        // 分配的内存地址
+    unsigned int size;                   // 分配的大小
+    char file_name[FILE_NAME_LENGTH];    // 分配发生的文件名
+    unsigned int line;                   // 分配发生的代码行号
+};
+typedef struct _MEM_INFO MEM_INFO;
+
+// 内存泄漏记录结构体，使用链表形式组织
+struct _MEM_LEAK {
+    MEM_INFO mem_info;               // 内存信息
+    struct _MEM_LEAK *next;         // 指向下一个节点的指针
+};
+
+typedef struct _MEM_LEAK MEM_LEAK;
+
+// 添加一条内存分配信息记录
+void add(MEM_INFO alloc_info);
+
+// 删除某个位置的内存记录
+void erase(unsigned pos);
+
+// 清空所有内存记录
+void clear(void);
+
+// 自定义 malloc：记录内存分配位置
+void *xmalloc(unsigned int size, const char *file, unsigned int line);
+
+// 自定义 calloc：记录内存分配位置
+void *xcalloc(unsigned int elements, unsigned int size, const char *file, unsigned int line);
+
+// 自定义 free：在释放内存时移除记录
+void xfree(void *mem_ref);
+
+// 添加一条内存分配记录
+void add_mem_info(void *mem_ref, unsigned int size, const char *file, unsigned int line);
+
+// 移除某个内存记录（在调用 free 时使用）
+void remove_mem_info(void *mem_ref);
+
+// 生成内存泄漏报告
+extern void report_mem_leak(void);
+
+extern void dump_mem_leak(void);
+
+#endif

leak_info.txt

@@ -0,0 +1,12 @@
+Memory Leak Summary
+-----------------------------------
+address : 0x7fffe6d502a0
+size    : 1 bytes
+file    : test.c
+line    : 8
+-----------------------------------
+address : 0x7fffe6d50520
+size    : 60 bytes
+file    : test.c
+line    : 14
+-----------------------------------

test.c

@@ -0,0 +1,20 @@
+#include	<malloc.h>
+#include <stdlib.h>
+#include	"leak_detector_c.h"
+int main()
+{
+    atexit(report_mem_leak);
+
+    char *ptr1 = (char *)malloc(1);
+    
+    
+
+    
+    int *ptr2 = (int *)calloc(1, sizeof(int));
+    float * ptr3 = (float *) calloc(15, sizeof(float));
+    free(ptr2);
+    
+    dump_mem_leak();
+
+    return 0;
+}