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Jim Kingdon 1993-04-23 16:27:10 +00:00
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gdb/doc/stabs.texinfo
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@ -1010,6 +1010,17 @@ There is at least one case where GCC uses a @samp{p}/@samp{r} pair
rather than @samp{P}; this is where the argument is passed in the
argument list and then loaded into a register.
On the sparc and hppa, for a @samp{P} symbol whose type is a structure
or union, the register contains the address of the structure. On the
sparc, this is also true of a @samp{p}/@samp{r} pair (using Sun cc) or a
@samp{p} symbol. However, if a (small) structure is really in a
register, @samp{r} is used. And, to top it all off, on the hppa it
might be a structure which was passed on the stack and loaded into a
register and for which there is a @samp{p}/@samp{r} pair! I believe
that symbol descriptor @samp{i} is supposed to deal with this case, but
I don't know details or what compilers or debuggers use it, if any (not
GDB or GCC).
There is another case similar to an argument in a register, which is an
argument which is actually stored as a local variable. Sometimes this
happens when the argument was passed in a register and then the compiler