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Removing MSVC C4127 from pragma block at the top of pybind11.h (#3152)

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* Removing pragma for 4127 (to see what is still broken with the latest code).

* Using new constexpr_bool() to suppress warning C4127.

* One missed case, Python 2 only.

* PYBIND11_SILENCE_MSVC_C4127 (more similar to the approach for C4100).
This commit is contained in:
Ralf W. Grosse-Kunstleve 2021-07-30 11:25:29 -07:00 committed by GitHub
parent e2573dc961
commit dcbda8d7ff
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 28 additions and 18 deletions
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12
include/pybind11/cast.h
View File

@ -384,7 +384,11 @@ template <typename StringType, bool IsView = false> struct string_caster {
const auto *buffer = reinterpret_cast<const CharT *>(PYBIND11_BYTES_AS_STRING(utfNbytes.ptr()));
size_t length = (size_t) PYBIND11_BYTES_SIZE(utfNbytes.ptr()) / sizeof(CharT);
if (UTF_N > 8) { buffer++; length--; } // Skip BOM for UTF-16/32
// Skip BOM for UTF-16/32
if (PYBIND11_SILENCE_MSVC_C4127(UTF_N > 8)) {
buffer++;
length--;
}
value = StringType(buffer, length);
// If we're loading a string_view we need to keep the encoded Python object alive:
@ -499,7 +503,7 @@ public:
// out how long the first encoded character is in bytes to distinguish between these two
// errors. We also allow want to allow unicode characters U+0080 through U+00FF, as those
// can fit into a single char value.
if (StringCaster::UTF_N == 8 && str_len > 1 && str_len <= 4) {
if (PYBIND11_SILENCE_MSVC_C4127(StringCaster::UTF_N == 8) && str_len > 1 && str_len <= 4) {
auto v0 = static_cast<unsigned char>(value[0]);
// low bits only: 0-127
// 0b110xxxxx - start of 2-byte sequence
@ -524,7 +528,7 @@ public:
// UTF-16 is much easier: we can only have a surrogate pair for values above U+FFFF, thus a
// surrogate pair with total length 2 instantly indicates a range error (but not a "your
// string was too long" error).
else if (StringCaster::UTF_N == 16 && str_len == 2) {
else if (PYBIND11_SILENCE_MSVC_C4127(StringCaster::UTF_N == 16) && str_len == 2) {
one_char = static_cast<CharT>(value[0]);
if (one_char >= 0xD800 && one_char < 0xE000)
throw value_error("Character code point not in range(0x10000)");
@ -778,7 +782,7 @@ struct pyobject_caster {
// For Python 2, without this implicit conversion, Python code would
// need to be cluttered with six.ensure_text() or similar, only to be
// un-cluttered later after Python 2 support is dropped.
if (std::is_same<T, str>::value && isinstance<bytes>(src)) {
if (PYBIND11_SILENCE_MSVC_C4127(std::is_same<T, str>::value) && isinstance<bytes>(src)) {
PyObject *str_from_bytes = PyUnicode_FromEncodedObject(src.ptr(), "utf-8", nullptr);
if (!str_from_bytes) throw error_already_set();
value = reinterpret_steal<type>(str_from_bytes);

11
include/pybind11/detail/common.h
View File

@ -941,5 +941,16 @@ inline constexpr void workaround_incorrect_msvc_c4100(Args &&...) {}
# define PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(...)
#endif
#if defined(_MSC_VER) // All versions (as of July 2021).
// warning C4127: Conditional expression is constant
constexpr inline bool silence_msvc_c4127(bool cond) { return cond; }
# define PYBIND11_SILENCE_MSVC_C4127(...) detail::silence_msvc_c4127(__VA_ARGS__)
#else
# define PYBIND11_SILENCE_MSVC_C4127(...) __VA_ARGS__
#endif
PYBIND11_NAMESPACE_END(detail)
PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)

6
include/pybind11/detail/init.h
View File

@ -96,7 +96,7 @@ template <typename Class>
void construct(value_and_holder &v_h, Cpp<Class> *ptr, bool need_alias) {
PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(need_alias);
no_nullptr(ptr);
if (Class::has_alias && need_alias && !is_alias<Class>(ptr)) {
if (PYBIND11_SILENCE_MSVC_C4127(Class::has_alias) && need_alias && !is_alias<Class>(ptr)) {
// We're going to try to construct an alias by moving the cpp type. Whether or not
// that succeeds, we still need to destroy the original cpp pointer (either the
// moved away leftover, if the alias construction works, or the value itself if we
@ -136,7 +136,7 @@ void construct(value_and_holder &v_h, Holder<Class> holder, bool need_alias) {
auto *ptr = holder_helper<Holder<Class>>::get(holder);
no_nullptr(ptr);
// If we need an alias, check that the held pointer is actually an alias instance
if (Class::has_alias && need_alias && !is_alias<Class>(ptr))
if (PYBIND11_SILENCE_MSVC_C4127(Class::has_alias) && need_alias && !is_alias<Class>(ptr))
throw type_error("pybind11::init(): construction failed: returned holder-wrapped instance "
"is not an alias instance");
@ -153,7 +153,7 @@ void construct(value_and_holder &v_h, Cpp<Class> &&result, bool need_alias) {
PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(need_alias);
static_assert(std::is_move_constructible<Cpp<Class>>::value,
"pybind11::init() return-by-value factory function requires a movable class");
if (Class::has_alias && need_alias)
if (PYBIND11_SILENCE_MSVC_C4127(Class::has_alias) && need_alias)
construct_alias_from_cpp<Class>(is_alias_constructible<Class>{}, v_h, std::move(result));
else
v_h.value_ptr() = new Cpp<Class>(std::move(result));

11
include/pybind11/pybind11.h
View File

@ -10,10 +10,7 @@
#pragma once
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
# pragma warning(push)
# pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
#elif defined(__GNUG__) && !defined(__clang__) && !defined(__INTEL_COMPILER)
#if defined(__GNUG__) && !defined(__clang__) && !defined(__INTEL_COMPILER)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wunused-but-set-parameter"
# pragma GCC diagnostic ignored "-Wattributes"
@ -166,7 +163,7 @@ protected:
auto rec = unique_rec.get();
/* Store the capture object directly in the function record if there is enough space */
if (sizeof(capture) <= sizeof(rec->data)) {
if (PYBIND11_SILENCE_MSVC_C4127(sizeof(capture) <= sizeof(rec->data))) {
/* Without these pragmas, GCC warns that there might not be
enough space to use the placement new operator. However, the
'if' statement above ensures that this is the case. */
@ -2388,8 +2385,6 @@ PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)
# pragma GCC diagnostic pop // -Wnoexcept-type
#endif
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
# pragma warning(pop)
#elif defined(__GNUG__) && !defined(__clang__) && !defined(__INTEL_COMPILER)
#if defined(__GNUG__) && !defined(__clang__) && !defined(__INTEL_COMPILER)
# pragma GCC diagnostic pop
#endif

4
include/pybind11/pytypes.h
View File

@ -1191,7 +1191,7 @@ PYBIND11_NAMESPACE_BEGIN(detail)
// unsigned type: (A)-1 != (B)-1 when A and B are unsigned types of different sizes).
template <typename Unsigned>
Unsigned as_unsigned(PyObject *o) {
if (sizeof(Unsigned) <= sizeof(unsigned long)
if (PYBIND11_SILENCE_MSVC_C4127(sizeof(Unsigned) <= sizeof(unsigned long))
#if PY_VERSION_HEX < 0x03000000
|| PyInt_Check(o)
#endif
@ -1212,7 +1212,7 @@ public:
template <typename T,
detail::enable_if_t<std::is_integral<T>::value, int> = 0>
int_(T value) {
if (sizeof(T) <= sizeof(long)) {
if (PYBIND11_SILENCE_MSVC_C4127(sizeof(T) <= sizeof(long))) {
if (std::is_signed<T>::value)
m_ptr = PyLong_FromLong((long) value);
else