Displaying 2 results from an estimated 2 matches for "convert_to_ptr".
2017 Jul 06
2
GEP with a null pointer base
I’m not entirely opposed to solution #3. As I said, my concern is that there are cases it would miss.
For instance, if I had some code like this:
char *get_ptr(char *base, intptr_t offset) {
return base + offset;
}
char *convert_to_ptr(intptr_t ptr_val) {
return get_ptr((char*)0, ptr_val);
}
There the idiom would only appear after inlining, so the front end couldn’t handle it. The current glibc code is implemented with a couple of layers of macros that have a logical branch that could theoretically result in the null coming i...
2017 Jul 06
5
GEP with a null pointer base
Hi everyone,
I've got a problem that I would like some input on. The problem basically boils down to a program that I am compiling, whose source I don't control, doing something like this:
p = (char*)0 + n
where 'n' is an intptr_t-sized value that the program knows is actually a valid address for a pointer.
clang translates this as
%p = getelementptr inbounds i8, i8*