Summary: dmd: ABI breakage/regression
--- Comment #0 from nfx...@gmail.com 2010-11-19 08:19:30 PST ---
At some point, both dmd and Phobos1 added a new member to TypeInfo_Struct:
The way dmd handles this causes an ABI breakage: dmd will use the _calculated_
size of the struct to calculate the offset of the name string. After that, dmd
_unconditionally_ writes the new m_flags field, and writes it at the same
offset where the name string is supposed to start.
As a result, TypeInfo names for structs are broken. The first 4 items of
typeid(somestruct).toString() will contain garbage. I'm not really sure why
after these 4 bytes, the expected string starts. Either I got it wrong, or the
backend data segment writer does strange things?
The problem doesn't appear if the object.d[i] contains the proper m_align. E.g.
BSD LICENSED CODE)
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