Debugger CVI: cannot read memory

Hello

Today, I met a display of debugger not seen before:

I'd be happy if someone could explain why this message.

I guess that 'external process' refers to the CVI debugger?

(using the CVI 2013SP1)

Thank you!

It's one of those dark corners of the protection of the user. You lose the information user-protection for memory_block_pointer in your macro:

#define MemoryFreeDynamicMemory(x) MemoryFreeDynamicMemoryI ( ( void ** ) &x )

It is really an artifact of how the user-protection is being implemented and how the information is passed through the program.

When you release this memory block, the block of memory is freed, but the protection of the user associated with this block is not marked as having been released, because the reference to this information has been lost in the combination of (void *) and &.

The debugger sees the initial denunciation of the protection of the user and who thinks (* memory_block_pointer) is always a valid block-oriented, returned memory.

It works when you move the memory block and the memory block pointer separately, because you avoid it (void *) and & on the parameter that is passed to free():

#define MemoryFreeDynamicMemory(x) MemoryFreeDynamicMemoryI(x, (void **)&x)

void MemoryFreeDynamicMemoryI(void *memory, void **pointer_to_memory)  // original u-p survives for 'memory'                                                                                                        // but is lost for 'pointer_to_memory'
{
    free(memory); // can mark original u-p as having been freed
    *pointer_to_memory = NULL; // doesn't need original u-p
}

As I said earlier, the user protection is very fragile in some areas.

Tags: NI Software

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