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Implement an optimization for finding the comment that occurs just after a 

given declaration.

It is based on the observation that during parsing the comment that should be
attached to the decl is usually among the last two documentation comments
parsed.

llvm-svn: 160400
This commit is contained in:
Dmitri Gribenko 2012-07-17 22:01:09 +00:00
parent 8b808c0c3d
commit 82ea947018
1 changed files with 24 additions and 6 deletions
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30
clang/lib/AST/ASTContext.cpp
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@ -97,12 +97,30 @@ RawComment *ASTContext::getRawCommentForDeclNoCache(const Decl *D) const {
return NULL;
// Find the comment that occurs just after this declaration.
RawComment CommentAtDeclLoc(SourceMgr, SourceRange(DeclLoc));
ArrayRef<RawComment *>::iterator Comment
= std::lower_bound(RawComments.begin(),
RawComments.end(),
&CommentAtDeclLoc,
BeforeThanCompare<RawComment>(SourceMgr));
ArrayRef<RawComment *>::iterator Comment;
{
// When searching for comments during parsing, the comment we are looking
// for is usually among the last two comments we parsed -- check them
// first.
RawComment CommentAtDeclLoc(SourceMgr, SourceRange(DeclLoc));
BeforeThanCompare<RawComment> Compare(SourceMgr);
ArrayRef<RawComment *>::iterator MaybeBeforeDecl = RawComments.end() - 1;
bool Found = Compare(*MaybeBeforeDecl, &CommentAtDeclLoc);
if (!Found && RawComments.size() >= 2) {
MaybeBeforeDecl--;
Found = Compare(*MaybeBeforeDecl, &CommentAtDeclLoc);
}
if (Found) {
Comment = MaybeBeforeDecl + 1;
assert(Comment == std::lower_bound(RawComments.begin(), RawComments.end(),
&CommentAtDeclLoc, Compare));
} else {
// Slow path.
Comment = std::lower_bound(RawComments.begin(), RawComments.end(),
&CommentAtDeclLoc, Compare);
}
}
// Decompose the location for the declaration and find the beginning of the
// file buffer.