[llvm-bugs] [Bug 35573] New: Calling array new with a negative size should be checked in C++14 mode

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35573

            Bug ID: 35573
           Summary: Calling array new with a negative size should be
                    checked in C++14 mode
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: t.p.northover at gmail.com
                CC: llvm-bugs at lists.llvm.org

When emitting code for a new array expression we check whether the array size
is negative in C++98 and C++11 mode, but not from C++14 onwards. E.g.

char *foo(int a) {
  return new char[a];
}

$ clang++ tmp.cpp -std=c++11 -S -o- -emit-llvm -Os
define noalias nonnull i8* @_Z3fooi(i32 %a) local_unnamed_addr #0 {
entry:
  %0 = sext i32 %a to i64
  %1 = icmp sgt i64 %0, -1
  %2 = select i1 %1, i64 %0, i64 -1
  %call = tail call i8* @_Znam(i64 %2) #2
  ret i8* %call
}

$ clang++ tmp.cpp -std=c++14 -S -o- -emit-llvm -Os
define noalias nonnull i8* @_Z3fooi(i32 %a) local_unnamed_addr #0 {
entry:
  %conv = sext i32 %a to i64
  %call = tail call i8* @_Znam(i64 %conv) #2
  ret i8* %call
}

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