http://llvm.org/bugs/show_bug.cgi?id=3214
Summary: Exception handling doesn't preserve callee-saved
registers
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Keywords: miscompilation
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=2304)
--> (http://llvm.org/bugs/attachment.cgi?id=2304)
gzipped test case
When I compile some simple exception-using code with LDC
(http://www.dsource.org/projects/ldc):
-----
module throws;
void main() { throw new Exception("test"); }
-----
and link it to an all-bc runtime (using llvm-gcc for the c files), this code
segfaults after the runtime catches the exception.
(Ubuntu 8.10 x86-64)
>From what gdb tells me, it seems that callee-saved registers aren't preserved
between the code in the try-block that contains the call to _Dmain (which is
what the code above compiles to) when it throws an exception.
This looks like an LLVM bug, not an LDC bug (since it's CPU-register level
stuff).
I'm attaching a .bc file. Unfortunately, it's rather large since it contains
much of the D runtime so LDC isn't needed to examine this.
=====
$ llc <bitcode.bc | as -o native.o && gcc native.o -lpthread -ldl -o native
$ ./native
: Segmentation fault
=====
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