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e91bc28667
They caused stack usage increase with -fstrict-aliasing as stack slots are not reused when dealing with unions. It has now been added the cast_struct_to_array macro in pios_struct_helper.h to handle such case where it is useful to access those homogeneous structs as arrays +review OPReview-552
30 lines
1001 B
C
30 lines
1001 B
C
/* Taken from include/linux/kernel.h from the Linux kernel tree */
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/**
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* container_of - cast a member of a structure out to the containing structure
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* @ptr: the pointer to the member.
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* @type: the type of the container struct this is embedded in.
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* @member: the name of the member within the struct.
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*
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*/
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#ifndef PIOS_STRUCT_HELPER_H
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#define PIOS_STRUCT_HELPER_H
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#define container_of(ptr, type, member) \
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({ \
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const typeof(((type *)0)->member) * __mptr = (ptr); \
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(type *)((char *)__mptr - offsetof(type, member)); } \
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)
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/**
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* cast_struct_to_array casts an homogeneous structure instance to an array
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* of typeof(struct_field). struct_field need to be any of the fields
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* containing inside the struct
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* @instance: homogeneous structure to cast
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* @struct_field: a field contained inside the structure
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*/
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#define cast_struct_to_array(instance, struct_field) \
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((typeof(struct_field) *) & (instance))
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#endif /* PIOS_STRUCT_HELPER_H */
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