Add support for Dwarf 5 in MCCAS #7611
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To support reading and writing DW_FORM_implicit_const in MCCAS, there is a need to be able to read a signed value of a DWARFFormValue and be able to write a signed LEB128 value to a CASObject. This change adds those two functions to their respective classes. (cherry picked from commit 6c8cbe8)
(cherry picked from commit 864cee9)
In Dwarf 5, for proper UnitDIE extraction, the debug_str_offsets section needs to be passed to the DWARFObject. This patch adds support for that. (cherry picked from commit a7b359e)
This includes, parsing the Dwarf 5 Compile Unit header correctly and correctly creating and materializing from the CAS with the larger DWARFv5 header. (cherry picked from commit 315c12b)
In DWARF 5, we can have padding after the debug_str section, so a PaddingRef must be added after the CAS blocks for individual strings. (cherry picked from commit a414c21)
In DWARF 5, there is a new form, DW_FORM_implicit_const, which encodes the value of the attribute in the debug_abbrev section, as a signed LEB128 number. This change adds support for being able to parse that and write it into MCCAS, as well as read it from a CASObject. (cherry picked from commit 1aa3ace)
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@swift-ci please test llvm |
(cherry picked from commit 32757fa)
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@swift-ci please test llvm |
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MCCAS doesn't support DWARF 5 currently. Since we are switching to DWARF 5 on all platforms relatively soon, we need to have MCCAS support it as well.
Cherry-picked from #7584