[LLVMbugs] [Bug 9810] New: AsmPrinter class does not emit debug line information.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9810

           Summary: AsmPrinter class does not emit debug line information.
           Product: libraries
           Version: 2.7
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: micah.villmow at amd.com
                CC: llvmbugs at cs.uiuc.edu


If the AsmPrinter class is overloaded and the printInstruction function is
called per the documentation here,
http://llvm.org/docs/WritingAnLLVMBackend.html#assemblyPrinter,
no debug line information is emitted in the resulting assembly file.

The reason for this is that AsmPrinter::EmitInstruction uses MachineInstr and
the line information is only emitted in the MCAsmStream::EmitInstruction
function which uses MCInstr instead.

Either the documentation needs to be updated so that it specifies that the
translation of MachineInstr to MCInstr needs to occur or that in the function
AsmPrinter::EmitFunctionBody, the call to MCLineEntry::Make(&OutStreamer,
getCurrentSection()); needs to be added for each instruction.

Otherwise the debug information does not have any debug lines.

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