source code macro VM_IMAGE_SIZE

[chchc086]

#define VM_IMAGE_SIZE(img_name) ((size_t)&_##img_name##_vm_size)
why add "&" to access ...vm_size value，I think its the address of ...vm_size

[josecm]

...vm_size is defined by the assembly code in the macro by setting the value of the symbol, not by placing the value in memory and tagging that location with ..vm_size. Therefore you need to take "the address", in truth, the value of the symbol, using the & operator. Hope this helps.

[sali3210]

''by setting the value of the symbol, not by placing the value in memory and tagging that location with''
could you explain this a little bit more in-depth on how I can tell in which way the symbol defined.

[chchc086]

Thanks for your response！
For the macro definition in assembly code that sets the value of a symbol, using the & operator to obtain the value can be understood as a C syntax rule, right?

[chchc086]

Or could you please tell me where I can find the answers in the official documentation?