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IR: Add 'distinct' MDNodes to bitcode and assembly

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Propagate whether `MDNode`s are 'distinct' through the other types of IR
(assembly and bitcode).  This adds the `distinct` keyword to assembly.

Currently, no one actually calls `MDNode::getDistinct()`, so these nodes
only get created for:

  - self-references, which are never uniqued, and
  - nodes whose operands are replaced that hit a uniquing collision.

The concept of distinct nodes is still not quite first-class, since
distinct-ness doesn't yet survive across `MapMetadata()`.

Part of PR22111.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225474 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-01-08 22:38:29 +00:00
parent 1cbba214c7
commit f416d72973
20 changed files with 110 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
lib/AsmParser/LLParser.cpp
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@ -618,8 +618,9 @@ bool LLParser::ParseStandaloneMetadata() {
if (Lex.getKind() == lltok::Type)
return TokError("unexpected type in metadata definition");
bool IsDistinct = EatIfPresent(lltok::kw_distinct);
if (ParseToken(lltok::exclaim, "Expected '!' here") ||
ParseMDNode(Init))
ParseMDNode(Init, IsDistinct))
return true;
// See if this was forward referenced, if so, handle it.
@ -2945,12 +2946,15 @@ bool LLParser::ParseGlobalValueVector(SmallVectorImpl<Constant *> &Elts) {
return false;
}
bool LLParser::ParseMDNode(MDNode *&MD) {
bool LLParser::ParseMDNode(MDNode *&MD, bool IsDistinct) {
SmallVector<Metadata *, 16> Elts;
if (ParseMDNodeVector(Elts))
return true;
MD = MDNode::get(Context, Elts);
if (IsDistinct)
MD = MDNode::getDistinct(Context, Elts);
else
MD = MDNode::get(Context, Elts);
return false;
}