Change Details

`DW_AT_ranges` can use `DW_FORM_sec_offset` (instead of `DW_FORM_rnglistx`). In such case `DW_AT_rnglists_base` does not need to be present. DWARF-5 spec: > "If the offset_entry_count is zero, then DW_FORM_rnglistx cannot be used to access a range list; DW_FORM_sec_offset must be used instead. If the offset_entry_count is non-zero, then DW_FORM_rnglistx may be used to access a range list;" This fix is for `TestTypeCompletion.py` category `dwarf` using GCC with DWARF-5. `TestTypeCompletion.py` category `dwo` needs a pending GCC fix: [[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99490 | -gdwarf-5 -gsplit-dwarf puts .debug_rnglists to main file, not .dwo file ]] The fix just provides `GetRnglist()` lazy getter for `m_rnglist_table`. The LLVM DWARFListTable.h fix is just for a better error message in this testcase. The testcase is easier to review by: `diff -u lldb/test/Shell/SymbolFile/DWARF/DW_AT_low_pc-addrx.s lldb/test/Shell/SymbolFile/DWARF/DW_AT_range-DW_FORM_sec_offset.s`

`DW_AT_ranges` can use `DW_FORM_sec_offset` (instead of `DW_FORM_rnglistx`). In such case `DW_AT_rnglists_base` does not need to be present. DWARF-5 spec: > "If the offset_entry_count is zero, then DW_FORM_rnglistx cannot be used to access a range list; DW_FORM_sec_offset must be used instead. If the offset_entry_count is non-zero, then DW_FORM_rnglistx may be used to access a range list;" This fix is for `TestTypeCompletion.py` category `dwarf` using GCC with DWARF-5. `TestTypeCompletion.py` category `dwo` needs a pending GCC fix: [[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99490 | -gdwarf-5 -gsplit-dwarf puts .debug_rnglists to main file, not .dwo file ]] The fix just provides `GetRnglist()` lazy getter for `m_rnglist_table`. The testcase is easier to review by: `diff -u lldb/test/Shell/SymbolFile/DWARF/DW_AT_low_pc-addrx.s lldb/test/Shell/SymbolFile/DWARF/DW_AT_range-DW_FORM_sec_offset.s`

`DW_AT_ranges` can use `DW_FORM_sec_offset` (instead of `DW_FORM_rnglistx`). In such case `DW_AT_rnglists_base` does not need to be present. DWARF-5 spec: > "If the offset_entry_count is zero, then DW_FORM_rnglistx cannot be used to access a range list; DW_FORM_sec_offset must be used instead. If the offset_entry_count is non-zero, then DW_FORM_rnglistx may be used to access a range list;" This fix is for `TestTypeCompletion.py` category `dwarf` using GCC with DWARF-5. `TestTypeCompletion.py` category `dwo` needs a pending GCC fix: [[ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99490 | -gdwarf-5 -gsplit-dwarf puts .debug_rnglists to main file, not .dwo file ]] The fix just provides `GetRnglist()` lazy getter for `m_rnglist_table`. The LLVM DWARFListTable.h fix is just for a better error message in this testcase. The testcase is easier to review by: `diff -u lldb/test/Shell/SymbolFile/DWARF/DW_AT_low_pc-addrx.s lldb/test/Shell/SymbolFile/DWARF/DW_AT_range-DW_FORM_sec_offset.s`