sparse-llvm segfaults when passing a struct pointer

["Jonathan Neuschäfer" <j.neuschaefer@gmx.net>]

Hi,

compiling a little real-world program with sparse-llvm, it segfaulted.
Using a tool called "delta"[1] and some bash scripting, I managed to
reduce the code to this test case:

    //struct foo {int a;};
    //struct foo;
    extern struct foo *foop;
    extern void func(struct foo *f);
    int main(int argc, char **argv) {
    	func(foop);
    }

(Uncommenting the commented lines doesn't change the crashing)

gdb gives me this backtrace:

    (gdb) bt
    #0  0x080b86c1 in LLVMBuildPtrToInt ()
    #1  0x080530fd in output_op_load (insn=0xb742512c, fn=0xbf85624c) at sparse-llvm.c:595
    #2  output_insn (insn=0xb742512c, fn=0xbf85624c) at sparse-llvm.c:1008
    #3  output_bb (generation=7, fn=0xbf85624c, bb=<optimized out>) at sparse-llvm.c:1096
    #4  output_fn (module=0xb7738f0c, module@entry=0x8ccc750, ep=<error reading variable: Unhandled dwarf expression opcode 0xfa>,
        ep=<error reading variable: Unhandled dwarf expression opcode 0xfa>) at sparse-llvm.c:1166
    #5  0x080507ec in compile (list=0xb773858c, module=0x8ccc750) at sparse-llvm.c:1227
    #6  main (argc=2, argv=0xbf856684) at sparse-llvm.c:1246

I'm using llvm version 3.0 (package version 1:3.0-14) from Debian and
sparse v0.4.4-100-g063236f (the most recent commit in git).

Thanks,
Jonathan Neuschäfer


[1] http://delta.tigris.org/

PS: I've also found sparse-llvm to crash if the source file contains
only the following (obviously incorrect) line, but I considered that
lower priority, since it is already incorrect code:

	static void out_byte(FILE *out, unsigned char byte) {
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