Commit Graph

9 Commits

Author SHA1 Message Date
Richard Smith 00d3e6c1b4 [c++17] Implement P0145R3 during constant evaluation.
Ensure that we evaluate assignment and compound-assignment
right-to-left, and array subscripting left-to-right.

Fixes PR47724.

This is a re-commit of ded79be, reverted in 37c74df, with a fix and test
for the crasher bug previously introduced.
2020-10-06 12:30:26 -07:00
Dmitri Gribenko 37c74dfe72 Revert "[c++17] Implement P0145R3 during constant evaluation."
This reverts commit ded79be635. It causes
a crash (I sent the crash reproducer directly to the author).
2020-10-06 15:49:44 +02:00
Richard Smith ded79be635 [c++17] Implement P0145R3 during constant evaluation.
Ensure that we evaluate assignment and compound-assignment
right-to-left, and array subscripting left-to-right.

Fixes PR47724.
2020-10-05 19:04:14 -07:00
Erik Pilkington f5d83f3768 [Sema] Discarded statment should be an evaluatable context.
The constexpr evaluator was erroring out because these templates weren't
defined. Despite being used in a discarded statement, we still need to constexpr
evaluate them, which means that we need to instantiate them. Fixes PR37585.

Differential revision: https://reviews.llvm.org/D48322

llvm-svn: 336233
2018-07-03 22:15:36 +00:00
Richard Smith dfe85e2d88 [c++1z] Permit constant evaluation of a call through a function pointer whose
type differs from the type of the actual function due to having a different
exception specification.

llvm-svn: 289754
2016-12-15 02:35:39 +00:00
Richard Smith b8c0f553ed DR1295 and cleanup for P0135R1: Make our initialization code more directly
mirror the description in the standard. Per DR1295, this means that binding a
const / rvalue reference to a bit-field no longer "binds directly", and per
P0135R1, this means that we materialize a temporary in reference binding
after adjusting cv-qualifiers and before performing a derived-to-base cast.

In C++11 onwards, this should have fixed the last case where we would
materialize a temporary of the wrong type (with a subobject adjustment inside
the MaterializeTemporaryExpr instead of outside), but we still have to deal
with that possibility in C++98, unless we want to start using xvalues to
represent materialized temporaries there too.

llvm-svn: 289250
2016-12-09 18:49:13 +00:00
Richard Smith 5f4b388442 Resolve exception specifications when selecting an overloaded operator.
llvm-svn: 284556
2016-10-19 00:14:23 +00:00
Richard Smith 84a0b6dba1 DR1330: instantiate exception-specifications when "needed". We previously did
not instantiate exception specifications of functions if they were only used in
unevaluated contexts (other than 'noexcept' expressions).

In C++17 onwards, this becomes essential since the exception specification is
now part of the function's type.

Note that this means that constructs like the following no longer work:

  struct A {
    static T f() noexcept(...);
    decltype(f()) *p;
  };

... because the decltype expression now needs the exception specification of
'f', which has not yet been parsed.

llvm-svn: 284549
2016-10-18 23:39:12 +00:00
Richard Smith 872307e2ac P0017R1: In C++1z, an aggregate class can have (public non-virtual) base classes; these are initialized as if they were data members.
llvm-svn: 262963
2016-03-08 22:17:41 +00:00