VS2019 驱动两个函数地址相同？

VS2019对于两个函数名不同，但是函数代码实现相同的情况，在链接时会将两个函数合并为同一个代码段，导致两个函数的地址相等。代码如下：

#include <wdm.h>

static void InnerFunc(int i, const char* name)
{
    DbgPrint("i=%d, name=%s\n", i, name);
}

typedef void* (*FuncIndexType)(int, const char*);

#define FUNC_NAME(x)    ((PVOID)FuncIndex_##x)

#define DEFINE_FUNC(x)\
    static void FuncIndex_##x(int i, const char *name)\
    {\
        InnerFunc(i, name);\
    }

DEFINE_FUNC(1);
DEFINE_FUNC(2);

static PVOID g_funcArray[] = { (PVOID)FUNC_NAME(1), (PVOID)FUNC_NAME(2) };

void DriverUnload(IN PDRIVER_OBJECT DriverObject)
{
    UNREFERENCED_PARAMETER(DriverObject);
}

NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING  RegistryPath)
{
    UNREFERENCED_PARAMETER(DriverObject);
    UNREFERENCED_PARAMETER(RegistryPath);

    DriverObject->DriverUnload = DriverUnload;
    DbgPrint("[DrvSample] DriverEntry...\n");
    for (int i = 0; i < sizeof(g_funcArray) / sizeof(void*); i++)
    {
        DbgPrint("Address:0x%p\n", g_funcArray[i]);
        ((FuncIndexType)g_funcArray[i])(i, "test");
    }
    return STATUS_SUCCESS;
}

上面驱动执行的结果如下图：

可以看出使用DEFINE_FUNC宏生成的FuncIndex_1和FuncIndex_2两个函数地址相等

那么要如何让两个函数地址不同呢？有两种方式：

1.禁用链接选项：启用COMPAT折叠

2.让两个函数有不同代码

#include <wdm.h>

static void InnerFunc(int index, int i, const char* name)
{
    DbgPrint("index=%d i=%d, name=%s\n", index, i, name);
}

typedef void* (*FuncIndexType)(int, const char*);

#define FUNC_NAME(x)    ((PVOID)FuncIndex_##x)

#define DEFINE_FUNC(x)\
    static void FuncIndex_##x(int i, const char *name)\
    {\
        InnerFunc(x, i, name);\
    }

DEFINE_FUNC(1);
DEFINE_FUNC(2);

static PVOID g_funcArray[] = { (PVOID)FUNC_NAME(1), (PVOID)FUNC_NAME(2) };

void DriverUnload(IN PDRIVER_OBJECT DriverObject)
{
    UNREFERENCED_PARAMETER(DriverObject);
}

NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING  RegistryPath)
{
    UNREFERENCED_PARAMETER(DriverObject);
    UNREFERENCED_PARAMETER(RegistryPath);

    DriverObject->DriverUnload = DriverUnload;
    DbgPrint("[DrvSample] DriverEntry...\n");
    for (int i = 0; i < sizeof(g_funcArray) / sizeof(void*); i++)
    {
        DbgPrint("Address:0x%p\n", g_funcArray[i]);
        ((FuncIndexType)g_funcArray[i])(i, "test");
    }
    return STATUS_SUCCESS;
}

上面两种方式的执行结果如下图：