[LLVMbugs] [Bug 7412] New: named sections vs. AliasAnalysis

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7412

           Summary: named sections vs. AliasAnalysis
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Global Analyses
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu


LLVM IR allows GlobalVariables to be allocated in sections specified by name.

@A = global i32 0, section "purple"
@B = global i32 0, section "purple"

Does LLVM guarantee anything about the order of @A and @B in section purple? If
not, is this a problem for code which expects to be able to place sentries at
the beginning and end of a named section?  If so, should AliasAnalysis consider
all variables in the same section to be part of the same underlying object?

ELF linkers provide magic symbols named __start_purple and __end_purple which
mark the beginning and end of the named section.  This is also relevant to
AliasAnalysis.  Aside: Does LLVM linking support this?

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