Commit Graph

6 Commits

Author SHA1 Message Date
Richard Smith ed5a18fc03 PR30738: Implement two-phase name lookup for fold-expressions. 2020-08-06 16:56:39 -07:00
Richard Smith c7214f6510 PR41845: Detect and reject mismatched inner/outer pack expansion sizes
in fold expressions rather than crashing.

llvm-svn: 360563
2019-05-13 08:31:14 +00:00
Richard Smith c70f1d63f8 [c++20] P0515R3: Parsing support and basic AST construction for operator <=>.
Adding the new enumerator forced a bunch more changes into this patch than I
would have liked. The -Wtautological-compare warning was extended to properly
check the new comparison operator, clang-format needed updating because it uses
precedence levels as weights for determining where to break lines (and several
operators increased their precedence levels with this change), thread-safety
analysis needed changes to build its own IL properly for the new operator.

All "real" semantic checking for this operator has been deferred to a future
patch. For now, we use the relational comparison rules and arbitrarily give
the builtin form of the operator a return type of 'void'.

llvm-svn: 320707
2017-12-14 15:16:18 +00:00
Richard Smith 8ee39e31bb Implement P0036R0: remove support for empty unary folds of +, *, |, &.
llvm-svn: 262747
2016-03-04 21:27:21 +00:00
Richard Smith ea97e36dfc Fix parsing of fold-expressions within a cast expression. We parse the
parenthesized expression a bit differently in this case, just in case the
commas have special meaning.

llvm-svn: 221661
2014-11-11 03:28:50 +00:00
Richard Smith 0f0af19b05 [c++1z] N4295: fold-expressions.
This is a new form of expression of the form:

  (expr op ... op expr)

where one of the exprs is a parameter pack. It expands into

  (expr1 op (expr2onwards op ... op expr))

(and likewise if the pack is on the right). The non-pack operand can be
omitted; in that case, an empty pack gives a fallback value or an error,
depending on the operator.

llvm-svn: 221573
2014-11-08 05:07:16 +00:00