Assembler fails if using input/output operands

[j1elo]

Using the example file func_calls.py from pycparser, with the only modification of instantiating a GnuCParser:

def show_func_calls(filename, funcname):
    gnu_parser = GnuCParser()
    ast = parse_file(filename, use_cpp=False, parser=gnu_parser)
    v = FuncCallVisitor(funcname)
    v.visit(ast)

Basic "asm" expressions are parsed correctly, such as
asm ("foo" ::: "bar");
or
__asm__ ("foo" ::: "bar", "bar");

However, any asm expression with i/o operands will fail with the error: AttributeError: 'Constant' object has no attribute 'name'.

This is the test file I'm using:

#include <stdio.h>
void main(void)
{
    // Sample: asm volatile("" ::: "memory")
    // => WORKS
    asm ("foo" ::: "bar");
    
    // Sample: __asm__ __volatile__("sub pc, pc, -4" ::: "memory", "cc")
    // => WORKS
    __asm__ ("foo" ::: "bar", "bar");
    
    // Sample: __asm__ ("brev\t%0" : "+r" (__value) :  : "cc")
    // => ERROR
    __asm__ ("foo" : "bar" (5) :  : "bar");
    
    // Sample: __asm__ __volatile__ ("ssrf\t%0" :  : "i" (OFFSET))
    // => ERROR
    __asm__ ("foo" :  : "bar" (5));
    
    // Sample: __asm__ ("max\t%0, %1, %2" : "=r" (__value) : "r" (__arg_a), "r" (__arg_b))
    // => ERROR
    __asm__ ("foo" : "bar" (5) : "bar" (6), "baz" (7));
}

The samples are lines of code taken from a real application, I don't have much knowledge about the syntax of these GCC extension but these lines compile and work correctly with GCC 4.4.7 so I assume they are valid variations of the asm function.

[inducer]

I unfortunately don't have time to work on this myself at the moment, but I'd be happy to take a patch.

This is the bit that would need changing.