[llvm-bugs] [Bug 33140] New: Assertion failed: Result.isUninit() && "temporary created multiple times", file ExprConstant.cpp, line 1107

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33140

            Bug ID: 33140
           Summary: Assertion failed: Result.isUninit() && "temporary
                    created multiple times", file ExprConstant.cpp, line
                    1107
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: russell_gallop at sn.scee.net
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

These are two cases found in internal testing. They hit the same assertion but
were introduced at different times, presumably by related commits.

$ cat testa.cpp
// ========================
struct S {
  constexpr S(const int &a = 0) {}
};
void foo(void) {
  S s[2] = {};
}
// =======================
$ clang -c testa.cpp -std=c++11
Assertion failed: Result.isUninit() && "temporary created multiple times", file
<...>\ExprConstant.cpp, line 1107

Bisects to:
commit f83586caa9df7ebae5226227614513df4af4b402
Author: Nick Lewycky <nicholas at mxc.ca>
Date:   Sat Apr 29 09:33:46 2017 +0000

    Remove Sema::CheckForIntOverflow, and instead check all full-expressions.

    CheckForIntOverflow used to implement a whitelist of top-level expressions
to
    send to the constant expression evaluator, which handled many more
expressions
    than the CheckForIntOverflow whitelist did.


    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@301742
91177308-0d34-0410-b5e6-96231b3b80d8


$ cat testb.cpp
// ==============================================================
bool bar(float const &f = 0);
bool foo() { return bar() && bar(); }
// ==============================================================
$ clang -c testb.cpp
Assertion failed: Result.isUninit() && "temporary created multiple times", file
<...>\ExprConstant.cpp, line 1107

Bisects to:
commit 750306071663247152ab611f63e1d97ec175786d
Author: Nick Lewycky <nicholas at mxc.ca>
Date:   Wed May 17 23:56:54 2017 +0000

    The constant expression evaluator should examine function arguments for
non-constexpr function calls unless the EvalInfo says to stop.

    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@303317
91177308-0d34-0410-b5e6-96231b3b80d8

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