Daniel Berlin <[EMAIL PROTECTED]> writes:
| > |
| > | Do you suppose the idiom is common enough that VRP could special-case
| > | "arrays of size 1 at the end of a struct" ?
| >
| > it could be array of size 2, 3, 4, 5, ...
|
| Except that anything but array of size 1 is not "such a C idomatic
| construct than I would not have expected any "optimizer" to break it."
Well, I've certainly come across many implementation of array like
structures using the aboce trick.
Consider the following
struct string_base {
int size;
char data[1];
};
in that structure (assuming an int is 4-byte wide), there are still
room for 3 more char. So it was written
struct string_base {
int size;
char data[sizeof(int)];
};
To take advantage of the full sizeof(string_base). In fact, some
libraries use numbers like 16 of 32 instead of sizeof(int). Some of
them are even used for the implementation of C++ codes.
-- Gaby
