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DebugInfo: Drop fake DW_TAG_expression

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Break MDExpression off of DebugNode (inherit directly from `MDNode`) and
drop the fake `DW_TAG_expression` tag in the process.

AFAICT, there's no real functionality change here.  The tag was
originally used by `DIDescriptor::isExpression()` to discriminate
between `MDNode`s, but in the new hierarchy we don't need that.

Fixes PR22780.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232550 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-03-17 21:32:46 +00:00
parent 7e4820c1a6
commit 887a867862
4 changed files with 3 additions and 7 deletions
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include/llvm/Support/Dwarf.def
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@@ -102,7 +102,6 @@ HANDLE_DW_TAG(0x0043, template_alias)
// Mock tags we use as discriminators.
HANDLE_DW_TAG(0x0100, auto_variable) // Tag for local (auto) variables.
HANDLE_DW_TAG(0x0101, arg_variable) // Tag for argument variables.
HANDLE_DW_TAG(0x0102, expression) // Tag for complex address expressions.
// New in DWARF v5.
HANDLE_DW_TAG(0x0044, coarray_type)