Hi, I came across the following line table program in gdb test-case dw2-ranges-base.exp: ... $ readelf -wl outputs/gdb.dwarf2/dw2-ranges-base/dw2-ranges-base
Line Number Statements: [0x00000154] Extended opcode 2: set Address to 0x4004ba [0x0000015f] Advance Line by 10 to 11 [0x00000161] Copy [0x00000162] Advance PC by 12 to 0x4004c6 [0x00000164] Advance Line by 19 to 30 [0x00000166] Copy [0x00000167] Extended opcode 1: End of Sequence ... My understanding of this is as follows. The Copy followed by End-of-Sequence is incorrect. Both the Copy and the End-of-Sequence append a row to the matrix, each using the same address: 0x4004c6. The Copy declares a target instruction at that address. The End-of-Sequence declares that the sequence ends before that address. It's a contradiction that the target instruction is both part of the sequence (according to Copy) and not part of the sequence (according to End-of-Sequence). Can you confirm that this analysis is correct? If so, is there a standard term to describe this problem? Incorrect/malformed/invalid/non-conforming/non-sensical or some such? [ FWIW, gdb handles this type of line table program by deleting the row corresponding to the Copy. The related comment mentions that it removes "empty lines" from the line table. I don't understand the use of the term "empty line" for this. ] Thanks, - Tom _______________________________________________ Dwarf-Discuss mailing list Dwarf-Discuss@lists.dwarfstd.org http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
