Ian Lance Taylor schrieb:
Georg-Johann Lay <avr@xxxxxxxx> writes:
Hi, suppose this test case of C code:
typedef void (*cb_t)(void) __attribute__((callback));
void caller (cb_t cb)
{
cb();
}
What I need in the backend is a way to query for the attributs that
are attaches to callees like 'cb'.
It may work to look at the MEM_EXPR of the call operand and look at
DECL_ATTRIBUTES of that.
Ian
Hi Ian, thanks again! :-)
I tried the REG_EXPR of the address and it looked good, but the
internals say that there may be cases where REG_EXPR is 0, so that there
would be no way to see if the callee is tagged with the attribute or not.
At the moment, I try to get the information in final, but I am not sure
if every C source will lead to a REG_EXPR that allows to decide wether
or not a call will change security level. Can you say a word about that?
If it is not 100% sure that attributes will work in /any/ imaginable
case then I will drop that idea, because security is a must here.
Then I am confused about the internals. In "9.3 Types"
http://gcc.gnu.org/onlinedocs/gccint/Types.html#Types
Macros like TYPE_PTRFN_P are documented, but are not present in the gcc
source tree. I am using gcc core for the port, but these macros are
contained only in the C++ part in ./cp/cp-tree.h. Maybe this could be
moved when reorganizing the gcc source tree, as such macros are useful
for C, too?
Georg-Johann
