Issue #17823 has been updated by xtkoba (Tee KOBAYASHI).

File ruby-addr2line-interpret-DW_RLE_start_length-r1.patch added

An edited patch is attached so that it applies cleanly to the current master head.

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Bug #17823: addr2line.c: Interpret `DW_RLE_start_length`
https://bugs.ruby-lang.org/issues/17823#change-93377

* Author: xtkoba (Tee KOBAYASHI)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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I noticed some of the symbol names were missing from C backtrace for an i686-linux binary built with GCC 10.3 + DWARF 5, and found that the form `DW_RLE_start_length` is used in it. This form was left uninterpreted in `addr2line.c`, because at the time of implementation the main purpose was to suppress segfaults (#17585).

The attached patch implements the interpretation of `DW_RLE_start_length` and `DW_RLE_start_end`. It also fixes some minor errors in the function `ranges_include`, mainly around the base address handling.

The patch also fixes the function `read_dw_form_addr` to use the correct address size (`reader->address_size`).

Note that the `DW_RLE_*`'s that require `.debug_addr` section are still left uninterpreted.

---Files--------------------------------
ruby-addr2line-interpret-DW_RLE_start_length.patch (3.25 KB)
ruby-addr2line-interpret-DW_RLE_start_length-r1.patch (3.26 KB)


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