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| author | Pekka Enberg <penberg@kernel.org> | 2012-08-05 22:42:46 +0300 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2012-08-05 22:48:32 +0300 |
| commit | 14d9355b4a2c6b25f4381ad6ac8b51715382703c (patch) | |
| tree | 5910a227863df6dfad3d3539fb059617af52ef92 /validation/backend/extern.c | |
| parent | ccf42dc22ef4354ef6db1673a5e2b2bc0a6be273 (diff) | |
| download | sparse-dev-14d9355b4a2c6b25f4381ad6ac8b51715382703c.tar.gz | |
sparse, llvm: Fix SIGSEGV for extern symbols
Jonathan Neuschäfer writes:
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:
extern struct foo *foop;
extern void func(struct foo *f);
int main(int argc, char **argv) {
func(foop);
}
The problem is that pseudo_to_value() does not know abou the extern
symbol because Sparse never calls output_data() on it which registers
globals with LLVMAddGlobal().
As explained by Linus, 'extern' symbols are just names with types. They
don't have any value associated with them, they just have the type and
the name. Therefore we need to explicitly call LLVMAddGlobal() for
symbols we have not encountered in pseudo_to_value().
Reported by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Cc: Christopher Li <sparse@chrisli.org>
Cc: Jeff Garzik <jgarzik@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'validation/backend/extern.c')
| -rw-r--r-- | validation/backend/extern.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/validation/backend/extern.c b/validation/backend/extern.c new file mode 100644 index 00000000..24cbae55 --- /dev/null +++ b/validation/backend/extern.c @@ -0,0 +1,11 @@ +extern unsigned long foo; + +static unsigned long bar(void) +{ + return foo; +} + +/* + * check-name: Extern symbol code generation + * check-command: ./sparsec -c $file -o tmp.o + */ |