[LLVMbugs] [Bug 12265] New: ObjcC assertion: "Instruction does not dominate all uses"

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12265

             Bug #: 12265
           Summary: ObjcC assertion: "Instruction does not dominate all
                    uses"
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: paul.q.stevenson at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


svn revision: 152666

The following code fragment fails to compile (with the assertion 'Instruction
does not dominate all uses!') with a freshly-built trunk clang run as

./Debug+Asserts/bin/clang -fobjc-arc -O1 -c -o /tmp/obj.o /tmp/bad.m 

When compiling with -O0 or -fobjc-arc-exceptions, the crash doesn't occur. The
crash also doesn't occur if f() calls +1 methods such as [o new] or [o alloc]
rather than [o description]


#import <Foundation/Foundation.h>

extern void Bar(id o1, id o2);

void f(id o) {
    @try {
        id object1 = [o description];
        id object2 = [o description];
        Bar(object1, object2);
    } @finally {
    }
}

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