http://llvm.org/bugs/show_bug.cgi?id=22780
Bug ID: 22780
Summary: Drop fake DW_TAG_expression
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Blocks: 21432
Classification: Unclassified
Now that we have a type hierarchy (from bug 22464), we don't need
`DW_TAG_expression` to discriminate DWARF expressions. We can use
`Metadata::getMetadataID()` instead.
1. Change `MDExpression::getTag()` to return `0u` and fix any fallout.
2. Remove `dwarf::DW_TAG_expression`.
3. Change `MDExpression` to inherit directly from `MDNode` instead of
`DebugNode`.
4. Investigate having it inherit directly from `Metadata` -- expressions don't
need/use metadata operands, they're not referenced from `NamedMDNode` or
`!attachments`, and they have no need for distinct/temporary semantics.
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