https://bugs.llvm.org/show_bug.cgi?id=52036
Bug ID: 52036
Summary: Clang breaks badly on too large object sizes
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
struct s {
char arr[922337203685477587];
char arr2[922337203685477587];
char arr3[922337203685477587];
char arr4[922337203685477587];
char arr5[922337203685477587];
char arr6[922337203685477587];
char arr7[922337203685477587];
char arr8[922337203685477587];
char arr9[922337203685477587];
char arr10[922337203685477587];
char arr11[922337203685477587];
char arr12[922337203685477587];
};
s x;
void f()
{
volatile s x = {};
}
The size of `s` is simply not representable in `size_t`, which seems to break
Clang in multiple ways:
- It gives me a warning telling me that "stack frame size exceeds limit" when
the warning tells me of a stack frame size that's smaller than the limit (it
tells me the stack frame size is 1717986984 and that the limit is 4294967295)
- The emitted assembly tries to call memset with a size of 461168601842738840,
which is smaller than even a single one of the arrays in `s`.
Probably Clang should just error on the declaration of `s`, as GCC does:
<source>:1:8: error: size of type 's' is too large ('11068046444225731044'
bytes)
1 | struct s {
| ^
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