diff options
| author | Richard Smith <richard-llvm@metafoo.co.uk> | 2012-02-01 08:10:20 +0000 |
|---|---|---|
| committer | Richard Smith <richard-llvm@metafoo.co.uk> | 2012-02-01 08:10:20 +0000 |
| commit | 15efc4d597a47e6ba5794d4fd8d561bf6947233c (patch) | |
| tree | f2e85b5cbf295eb13d69dc66f47805230c83ec76 /lib/Frontend/CompilerInvocation.cpp | |
| parent | ab14ae2ab16088b6a7f69eac6e152c3e9f9ea01b (diff) | |
constexpr: check for overflow in pointer subtraction.
This is a mess. According to the C++11 standard, pointer subtraction only has
undefined behavior if the difference of the array indices does not fit into a
ptrdiff_t.
However, common implementations effectively perform a char* subtraction first,
and then divide the result by the element size, which can cause overflows in
some cases. Those cases are not considered to be undefined behavior by this
change; perhaps they should be.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149490 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Frontend/CompilerInvocation.cpp')
0 files changed, 0 insertions, 0 deletions