Crash on index into zero element struct

[llvmbot]

Bugzilla Link	3744
Resolution	FIXED
Resolved on	Mar 09, 2009 00:46
Version	unspecified
OS	All
Reporter	LLVM Bugzilla Contributor

Extended Description

This code is causing problems:

$ cat t2.i
struct Empty {};
struct Union {
union {
int zero_arr[0];
} contents;
};
static inline void Foo(struct Union *u) {
int *array = u->contents.zero_arr;
}
static void Bar(struct Union *u) {
Foo(u);
}

$ llvm-gcc -c t2.i
Assertion failed: (MemberIndex < StructTy->getNumContainedTypes() && "Field Idx out of range!"), function EmitLV_COMPONENT_REF, file ../../llvm-gcc.src/gcc/llvm-convert.cpp, line 5993.
t2.i: In function ‘Foo’:
t2.i:7: internal compiler error: Abort trap
Please submit a full bug report,
with preprocessed source if appropriate.
See URL:http://developer.apple.com/bugreporter for instructions.

[llvmbot]

I will try to take a look this weekend.

[lattner]

Fixed, patch here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090309/074868.html

testcase here: test/FrontendC/2009-03-08-ZeroEltStructCrash.c