http://llvm.org/bugs/show_bug.cgi?id=19007
Bug ID: 19007
Summary: Destructor alias emission ignores calling convention
Product: clang
Version: trunk
Hardware: PC
URL: http://www.freebsd.org/cgi/query-pr.cgi?pr=187103
OS: All
Status: NEW
Keywords: miscompilation
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Here's a mildly insane test case reduced from mozilla.
$ cat t.cc
#define NS_CONSTRUCTOR_FASTCALL __attribute__ ((regparm (3), stdcall))
struct nsCOMPtr_base {
NS_CONSTRUCTOR_FASTCALL ~nsCOMPtr_base() {}
};
struct nsCOMPtr : private nsCOMPtr_base {};
int main() {
nsCOMPtr ptr;
}
$ clang -target i386-linux-gnu -O1 -Xclang -disable-llvm-optzns -flto -S -o -
t.cc
define i32 @main() #0 {
entry:
%ptr = alloca %struct.nsCOMPtr, align 1
call void bitcast (void (%struct.nsCOMPtr_base*)* @_ZN13nsCOMPtr_baseD2Ev to
void (%struct.nsCOMPtr*)*)(%struct.nsCOMPtr* %ptr)
ret i32 0
}
define linkonce_odr x86_stdcallcc void
@_ZN13nsCOMPtr_baseD2Ev(%struct.nsCOMPtr_base* inreg %this)
Here we create a call to @_ZN13nsCOMPtr_baseD2Ev without adding the
x86_stdcallcc attribute to the call. The optimizer will turn this into a call
to @llvm.trap.
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