indirect call in RTL dump files

[sean yang]

http://gcc.fyxm.net/summit/2004/GCC%20Call%20Graph.pdf

For the RTL representation, there are two type of function call instructions 
as I understand.
1) direct call---this type of calls are shown with something like
(call (mem:QI (symbol_ref:SI ("bar") [flags 0x3] <function_decl 0xb72bf8dc 
bar>) [0 S1 A8])
And the corresponding source code is something like "bar();" in C.

2) indirect call (explained in 3.1 in the above paper)
Can someone help me explain this a bit? --what the corresponding code is in 
C, and what causes it to happen? What does the RTL code look like?

Thanks,

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