[libcxx] Never use <cassert> within libc++

Summary:
It is my opinion that libc++ should never use `<cassert>`, including in the `dylib`. This patch remove all uses of `assert` from within libc++ and replaces most of them with `_LIBCPP_ASSERT` instead.

Additionally this patch turn `LIBCXX_ENABLE_ASSERTIONS`  off by default, because the standard library should not be aborting user programs unless explicitly asked to.

Reviewers: mclow.lists, compnerd, smeenai

Reviewed By: mclow.lists

Subscribers: mgorny, cfe-commits

Differential Revision: https://reviews.llvm.org/D29063

llvm-svn: 292883
This commit is contained in:
Eric Fiselier 2017-01-24 04:57:33 +00:00
parent 5a6826ebc4
commit d5fd7d7ea1
7 changed files with 9 additions and 13 deletions

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@ -60,7 +60,7 @@ endif()
include(CMakeDependentOption)
# Basic options ---------------------------------------------------------------
option(LIBCXX_ENABLE_ASSERTIONS "Enable assertions independent of build mode." ON)
option(LIBCXX_ENABLE_ASSERTIONS "Enable assertions independent of build mode." OFF)
option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
option(LIBCXX_ENABLE_STATIC "Build libc++ as a static library." ON)
option(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY "Build libc++experimental.a" ON)
@ -501,6 +501,7 @@ endif()
# Assertion flags =============================================================
define_if(LIBCXX_ENABLE_ASSERTIONS -UNDEBUG)
define_if_not(LIBCXX_ENABLE_ASSERTIONS -DNDEBUG)
define_if(LIBCXX_ENABLE_ASSERTIONS -D_LIBCPP_DEBUG=0)
define_if(LIBCXX_DEBUG_BUILD -D_DEBUG)
if (LIBCXX_ENABLE_ASSERTIONS AND NOT LIBCXX_DEBUG_BUILD)
# MSVC doesn't like _DEBUG on release builds. See PR 4379.

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@ -824,7 +824,9 @@ template <unsigned> struct __static_assert_check {};
# else
# error Supported values for _LIBCPP_DEBUG are 0 and 1
# endif
# if !defined(_LIBCPP_BUILDING_LIBRARY)
# define _LIBCPP_EXTERN_TEMPLATE(...)
# endif
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE

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@ -25,7 +25,6 @@
# include <pthread.h>
# include <sched.h>
#elif defined(_LIBCPP_HAS_THREAD_API_WIN32)
#include <assert.h>
#include <Windows.h>
#include <process.h>
#include <fibersapi.h>

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@ -14,7 +14,6 @@
#include "condition_variable"
#include "thread"
#include "system_error"
#include "cassert"
_LIBCPP_BEGIN_NAMESPACE_STD

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@ -6,11 +6,9 @@
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#undef NDEBUG
#include "experimental/filesystem"
#include "string_view"
#include "utility"
#include "cassert"
namespace { namespace parser
{
@ -113,7 +111,6 @@ public:
void decrement() noexcept {
const PosPtr REnd = &Path.front() - 1;
const PosPtr RStart = getCurrentTokenStartPos() - 1;
assert(RStart != REnd);
switch (State) {
case PS_AtEnd: {
@ -322,7 +319,6 @@ string_view_t path::__root_path_raw() const
auto NextCh = PP.peek();
if (NextCh && *NextCh == '/') {
++PP;
assert(PP.State == PathParser::PS_InRootDir);
return createView(__pn_.data(), &PP.RawEntry.back());
}
return PP.RawEntry;

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@ -11,7 +11,6 @@
#include "mutex"
#include "limits"
#include "system_error"
#include "cassert"
#include "include/atomic_support.h"
_LIBCPP_BEGIN_NAMESPACE_STD
@ -45,7 +44,7 @@ mutex::unlock() _NOEXCEPT
{
int ec = __libcpp_mutex_unlock(&__m_);
(void)ec;
assert(ec == 0);
_LIBCPP_ASSERT(ec == 0, "call to mutex::unlock failed");
}
// recursive_mutex
@ -61,7 +60,7 @@ recursive_mutex::~recursive_mutex()
{
int e = __libcpp_recursive_mutex_destroy(&__m_);
(void)e;
assert(e == 0);
_LIBCPP_ASSERT(e == 0, "call to ~recursive_mutex() failed");
}
void
@ -77,7 +76,7 @@ recursive_mutex::unlock() _NOEXCEPT
{
int e = __libcpp_recursive_mutex_unlock(&__m_);
(void)e;
assert(e == 0);
_LIBCPP_ASSERT(e == 0, "call to recursive_mutex::unlock() failed");
}
bool

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@ -17,9 +17,9 @@
#include "cstring"
#include "cstdio"
#include "cstdlib"
#include "cassert"
#include "string"
#include "string.h"
#include "__debug"
#if defined(__ANDROID__)
#include <android/api-level.h>
@ -96,7 +96,7 @@ string do_strerror_r(int ev) {
std::snprintf(buffer, strerror_buff_size, "Unknown error %d", ev);
return string(buffer);
} else {
assert(new_errno == ERANGE);
_LIBCPP_ASSERT(new_errno == ERANGE, "unexpected error from ::strerr_r");
// FIXME maybe? 'strerror_buff_size' is likely to exceed the
// maximum error size so ERANGE shouldn't be returned.
std::abort();