http://llvm.org/bugs/show_bug.cgi?id=2911
Summary: Assert triggered when complex GC roots initialized
Product: libraries
Version: 2.3
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Common Code Generator Code
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
In some GC systems where fat pointers are used to keep track of references
within objects, instances of fat pointers may be rooted on the stack to make
them visible to the garbage collector. When the root initializer code in the
collector base class hits these it will assert because it is not a pointer and
a cast<> operation cannot be performed safely. This happens for example with
this code:
%FatPointerType = type { i8*, i32 }
declare void @llvm.gcroot(i8**, i8*) nounwind
define i32 @TestFunc() gc "somegc"
{
%local_fatpointer = alloca %FatPointerType
%local_fatpointer_ptr = bitcast %FatPointerType* %local_fatpointer to i8**
call void @llvm.gcroot(i8** %local_fatpointer_ptr, i8* null)
ret i32 0
}
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