Commits on Dec 5, 2019

1. Change how MachObject::raw_section finds segments. …

   Currently `raw_section` finds the given section by assuming that it's
   within a segment named `__TEXT` or `__DWARF`, finding such a segment,
   and then searching within that segment.
   
   However, this fails for `.o` files, because they have a single nameless
   segment. As
   https://github.com/aidansteele/osx-abi-macho-file-format-reference says:
   
   > For compactness, an intermediate object file contains only one
   > segment. This segment has no name; it contains all the sections
   > destined ultimately for different segments in the final object file.
   
   This commit changes `raw_section` so it ignores segment names, and
   simply searches through all segments.
   
   As well as working with `.o` files, the resulting code is a little
   shorter and simpler.

   

   nnethercote committed Dec 5, 2019
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2. Allow zero addresses in DWARF units. …

   Because they occur in `.o` files.
   
   Without the first change in this commit, debuginfo for entire `.o` files
   can be missed. Without the second change, debuginfo for the first
   function (which can start at 0x0) can be missed.

   

   nnethercote committed Dec 5, 2019
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