[LLVMbugs] [Bug 12666] New: Hitting recursive JIT assert w/ aliases

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12666

             Bug #: 12666
           Summary: Hitting recursive JIT assert w/ aliases
           Product: new-bugs
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: boulos at cs.stanford.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


When I run the following IR with function aliases through lli, I hit this
assert:

Assertion failed: (!isAlreadyCodeGenerating && "Error: Recursive compilation
detected!"), function runJITOnFunctionUnlocked, file JIT.cpp, line 617.

This is reproducible in LLVM-2.9 through TOT.

This is effectively a reduced version of the code I had in PR12607.  The key is
that the JIT needs to be responsible for JIT'ing both Aliasee and MyAlias
(making MyAlias alias putchar directly doesn't trigger this assert).

------------

; AliasPutchar.ll
declare i32 @putchar(i32)

@MyAlias = alias i32 ()* @Aliasee

define i32 @Aliasee() {
entry:
  %0 = call i32 @putchar(i32 65)
  ret i32 %0
}

define i32 @main() {
entry:
  %0 = call i32 @MyAlias()
  ret i32 %0
}

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