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don't ice when an extern static is too big
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asquared31415
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Feb 24, 2022
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,43 @@ | ||
#[repr(C)] | ||
struct ReallyBig { | ||
_a: [u8; usize::MAX], | ||
} | ||
|
||
// The limit for "too big for the current architecture" is dependent on the target pointer size | ||
// however it's artifically limited on 64 bits | ||
// logic copied from rustc_target::abi::TargetDataLayout::obj_size_bound() | ||
const fn max_size() -> usize { | ||
#[cfg(target_pointer_width = "16")] | ||
{ | ||
1 << 15 | ||
} | ||
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#[cfg(target_pointer_width = "32")] | ||
{ | ||
1 << 31 | ||
} | ||
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#[cfg(target_pointer_width = "64")] | ||
{ | ||
1 << 47 | ||
} | ||
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#[cfg(not(any( | ||
target_pointer_width = "16", | ||
target_pointer_width = "32", | ||
target_pointer_width = "64" | ||
)))] | ||
{ | ||
isize::MAX as usize | ||
} | ||
} | ||
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extern "C" { | ||
static FOO: [u8; 1]; | ||
static BAR: [u8; max_size() - 1]; | ||
static BAZ: [u8; max_size()]; //~ ERROR extern static is too large | ||
static UWU: [usize; usize::MAX]; //~ ERROR extern static is too large | ||
static A: ReallyBig; //~ ERROR extern static is too large | ||
} | ||
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fn main() {} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,20 @@ | ||
error: extern static is too large for the current architecture | ||
--> $DIR/extern-static-size-overflow.rs:38:5 | ||
| | ||
LL | static BAZ: [u8; max_size()]; | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
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error: extern static is too large for the current architecture | ||
--> $DIR/extern-static-size-overflow.rs:39:5 | ||
| | ||
LL | static UWU: [usize; usize::MAX]; | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
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error: extern static is too large for the current architecture | ||
--> $DIR/extern-static-size-overflow.rs:40:5 | ||
| | ||
LL | static A: ReallyBig; | ||
| ^^^^^^^^^^^^^^^^^^^^ | ||
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error: aborting due to 3 previous errors | ||
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