[LLVMbugs] [Bug 6304] New: AlphaRegisterInfo.cpp:306:52: warning: array subscript is above array bounds

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=6304

           Summary: AlphaRegisterInfo.cpp:306:52: warning: array subscript
                    is above array bounds
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


According to gcc-4.5:

lib/Target/Alpha/AlphaRegisterInfo.cpp: In member function 'virtual void
llvm::AlphaRegisterInfo::emitEpilogue(llvm::MachineFunction&,
llvm::MachineBasicBlock&) const':
lib/Target/Alpha/AlphaRegisterInfo.cpp:306:52: warning: array subscript is
above array bounds

The line in question is this:

      Msg << "Too big a stack frame at " + NumBytes;

Presumably here "+" is pointer addition, resulting in a pointer
into the string.  At this point in the code gcc knows that NumBytes
is quite big (NumBytes > IMM_HIGH), so probably sees that this results
in pointing beyond the end of the string.

This is not the only place with this "Msg << c_string + Integer;"
construction, but is probably the only one where gcc knew that the
offset is always large.


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