PR libstdc++/68210 adjust operator new and delete for LWG 206

Message ID 20180810202039.GA4561@redhat.com
State New
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  • PR libstdc++/68210 adjust operator new and delete for LWG 206
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Commit Message

Jonathan Wakely Aug. 10, 2018, 8:20 p.m.
Ensure that nothrow versions of new and delete call the ordinary
versions of new or delete, instead of calling malloc or free directly.

These files are all compiled with -std=gnu++14 so can use noexcept and
nullptr to make the code more readable.

	PR libstdc++/68210
	* doc/xml/manual/intro.xml: Document LWG 206 change.
	* libsupc++/del_op.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
	* libsupc++/del_opa.cc: Likewise.
	* libsupc++/del_opant.cc: Likewise.
	* libsupc++/del_opnt.cc: Likewise. Call operator delete(ptr) instead
	of free(ptr).
	* libsupc++/del_ops.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
	* libsupc++/del_opsa.cc: Likewise.
	* libsupc++/del_opva.cc: Likewise.
	* libsupc++/del_opvant.cc: Likewise.
	* libsupc++/del_opvnt.cc: Likewise. Call operator delete[](ptr)
	instead of operator delete(ptr).
	* libsupc++/del_opvs.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
	* libsupc++/del_opvsa.cc: Likewise.
	* libsupc++/new_op.cc: Use __builtin_expect in check for zero size.
	* libsupc++/new_opa.cc: Use nullptr instead of literal 0.
	* libsupc++/new_opant.cc: Likewise. Replace _GLIBCXX_USE_NOEXCEPT
	with noexcept.
	* libsupc++/new_opnt.cc: Likewise. Call operator new(sz) instead of
	malloc(sz).
	* libsupc++/new_opvant.cc: Use nullptr and noexcept.
	* libsupc++/new_opvnt.cc: Likewise. Call operator new[](sz) instead of
	operator new(sz, nothrow).
	* testsuite/18_support/new_nothrow.cc: New test.

Tested x86_64-linux, committed to trunk.
commit ef6c2cd63b0af7fa0823d81d0098361a46230b26
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Aug 10 19:59:00 2018 +0100

    PR libstdc++/68210 adjust operator new and delete for LWG 206
    
    Ensure that nothrow versions of new and delete call the ordinary
    versions of new or delete, instead of calling malloc or free directly.
    
    These files are all compiled with -std=gnu++14 so can use noexcept and
    nullptr to make the code more readable.
    
            PR libstdc++/68210
            * doc/xml/manual/intro.xml: Document LWG 206 change.
            * libsupc++/del_op.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
            * libsupc++/del_opa.cc: Likewise.
            * libsupc++/del_opant.cc: Likewise.
            * libsupc++/del_opnt.cc: Likewise. Call operator delete(ptr) instead
            of free(ptr).
            * libsupc++/del_ops.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
            * libsupc++/del_opsa.cc: Likewise.
            * libsupc++/del_opva.cc: Likewise.
            * libsupc++/del_opvant.cc: Likewise.
            * libsupc++/del_opvnt.cc: Likewise. Call operator delete[](ptr)
            instead of operator delete(ptr).
            * libsupc++/del_opvs.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
            * libsupc++/del_opvsa.cc: Likewise.
            * libsupc++/new_op.cc: Use __builtin_expect in check for zero size.
            * libsupc++/new_opa.cc: Use nullptr instead of literal 0.
            * libsupc++/new_opant.cc: Likewise. Replace _GLIBCXX_USE_NOEXCEPT
            with noexcept.
            * libsupc++/new_opnt.cc: Likewise. Call operator new(sz) instead of
            malloc(sz).
            * libsupc++/new_opvant.cc: Use nullptr and noexcept.
            * libsupc++/new_opvnt.cc: Likewise. Call operator new[](sz) instead of
            operator new(sz, nothrow).
            * testsuite/18_support/new_nothrow.cc: New test.

Patch

diff --git a/libstdc++-v3/doc/xml/manual/intro.xml b/libstdc++-v3/doc/xml/manual/intro.xml
index fea07e2bb5f..cb187e1a2ed 100644
--- a/libstdc++-v3/doc/xml/manual/intro.xml
+++ b/libstdc++-v3/doc/xml/manual/intro.xml
@@ -440,6 +440,17 @@  requirements of the license of GCC.
     <listitem><para>Yes, it can, specifically if EOF is reached while skipping whitespace.
     </para></listitem></varlistentry>
 
+    <varlistentry xml:id="manual.bugs.dr206"><term><link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="&DR;#206">206</link>:
+	<emphasis><code>operator new(size_t, nothrow)</code> may become
+          unlinked to ordinary <code>operator new</code> if ordinary
+          version replaced
+        </emphasis>
+    </term>
+    <listitem><para>The <code>nothrow</code> forms of new and delete were
+      changed to call the throwing forms, handling any exception by
+      catching it and returning a null pointer.
+    </para></listitem></varlistentry>
+
     <varlistentry xml:id="manual.bugs.dr211"><term><link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="&DR;#211">211</link>:
 	<emphasis>operator&gt;&gt;(istream&amp;, string&amp;) doesn't set failbit</emphasis>
     </term>
diff --git a/libstdc++-v3/libsupc++/del_op.cc b/libstdc++-v3/libsupc++/del_op.cc
index 9a5cb82fdf0..ab3b617afa7 100644
--- a/libstdc++-v3/libsupc++/del_op.cc
+++ b/libstdc++-v3/libsupc++/del_op.cc
@@ -44,7 +44,7 @@  _GLIBCXX_END_NAMESPACE_VERSION
 #pragma GCC diagnostic ignored "-Wsized-deallocation"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete(void* ptr) _GLIBCXX_USE_NOEXCEPT
+operator delete(void* ptr) noexcept
 {
   std::free(ptr);
 }
diff --git a/libstdc++-v3/libsupc++/del_opa.cc b/libstdc++-v3/libsupc++/del_opa.cc
index 71f384df661..2a1f0aba3a1 100644
--- a/libstdc++-v3/libsupc++/del_opa.cc
+++ b/libstdc++-v3/libsupc++/del_opa.cc
@@ -44,7 +44,7 @@  _GLIBCXX_END_NAMESPACE_VERSION
 #pragma GCC diagnostic ignored "-Wsized-deallocation"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete(void* ptr, std::align_val_t) _GLIBCXX_USE_NOEXCEPT
+operator delete(void* ptr, std::align_val_t) noexcept
 {
 #if _GLIBCXX_HAVE_ALIGNED_ALLOC || _GLIBCXX_HAVE_POSIX_MEMALIGN \
     || _GLIBCXX_HAVE_MEMALIGN
diff --git a/libstdc++-v3/libsupc++/del_opant.cc b/libstdc++-v3/libsupc++/del_opant.cc
index a4305a3146a..603d9f2e9d2 100644
--- a/libstdc++-v3/libsupc++/del_opant.cc
+++ b/libstdc++-v3/libsupc++/del_opant.cc
@@ -27,7 +27,7 @@ 
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete (void *ptr, std::align_val_t al, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+operator delete (void *ptr, std::align_val_t al, const std::nothrow_t&) noexcept
 {
   ::operator delete (ptr, al);
 }
diff --git a/libstdc++-v3/libsupc++/del_opnt.cc b/libstdc++-v3/libsupc++/del_opnt.cc
index 2bbcdc3dceb..a2762659d9f 100644
--- a/libstdc++-v3/libsupc++/del_opnt.cc
+++ b/libstdc++-v3/libsupc++/del_opnt.cc
@@ -41,7 +41,10 @@  _GLIBCXX_END_NAMESPACE_VERSION
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete (void *ptr, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+operator delete (void *ptr, const std::nothrow_t&) noexcept
 {
-  std::free(ptr);
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 206. operator new(size_t, nothrow) may become unlinked to ordinary
+  // operator new if ordinary version replaced
+  ::operator delete (ptr);
 }
diff --git a/libstdc++-v3/libsupc++/del_ops.cc b/libstdc++-v3/libsupc++/del_ops.cc
index 1fa24f22dc3..e452c7cf19e 100644
--- a/libstdc++-v3/libsupc++/del_ops.cc
+++ b/libstdc++-v3/libsupc++/del_ops.cc
@@ -28,7 +28,7 @@ 
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete(void* ptr, std::size_t) _GLIBCXX_USE_NOEXCEPT
+operator delete(void* ptr, std::size_t) noexcept
 {
   ::operator delete (ptr);
 }
diff --git a/libstdc++-v3/libsupc++/del_opsa.cc b/libstdc++-v3/libsupc++/del_opsa.cc
index 1984fce9c90..2cadb4b6ae4 100644
--- a/libstdc++-v3/libsupc++/del_opsa.cc
+++ b/libstdc++-v3/libsupc++/del_opsa.cc
@@ -27,7 +27,7 @@ 
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete(void* ptr, std::size_t, std::align_val_t al) _GLIBCXX_USE_NOEXCEPT
+operator delete(void* ptr, std::size_t, std::align_val_t al) noexcept
 {
   ::operator delete (ptr, al);
 }
diff --git a/libstdc++-v3/libsupc++/del_opva.cc b/libstdc++-v3/libsupc++/del_opva.cc
index dc727b38c24..a539ccc8187 100644
--- a/libstdc++-v3/libsupc++/del_opva.cc
+++ b/libstdc++-v3/libsupc++/del_opva.cc
@@ -30,7 +30,7 @@ 
 #pragma GCC diagnostic ignored "-Wsized-deallocation"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete[] (void *ptr, std::align_val_t al) _GLIBCXX_USE_NOEXCEPT
+operator delete[] (void *ptr, std::align_val_t al) noexcept
 {
   ::operator delete (ptr, al);
 }
diff --git a/libstdc++-v3/libsupc++/del_opvant.cc b/libstdc++-v3/libsupc++/del_opvant.cc
index 86406b253b1..892c8b7999b 100644
--- a/libstdc++-v3/libsupc++/del_opvant.cc
+++ b/libstdc++-v3/libsupc++/del_opvant.cc
@@ -27,7 +27,7 @@ 
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete[] (void *ptr, std::align_val_t al, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+operator delete[] (void *ptr, std::align_val_t al, const std::nothrow_t&) noexcept
 {
   ::operator delete[] (ptr, al);
 }
diff --git a/libstdc++-v3/libsupc++/del_opvnt.cc b/libstdc++-v3/libsupc++/del_opvnt.cc
index ed06d2e82d5..f050526093b 100644
--- a/libstdc++-v3/libsupc++/del_opvnt.cc
+++ b/libstdc++-v3/libsupc++/del_opvnt.cc
@@ -27,7 +27,7 @@ 
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete[] (void *ptr, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+operator delete[] (void *ptr, const std::nothrow_t&) noexcept
 {
-  ::operator delete (ptr);
+  ::operator delete[] (ptr);
 }
diff --git a/libstdc++-v3/libsupc++/del_opvs.cc b/libstdc++-v3/libsupc++/del_opvs.cc
index 2be94d6562c..4b1e161fb25 100644
--- a/libstdc++-v3/libsupc++/del_opvs.cc
+++ b/libstdc++-v3/libsupc++/del_opvs.cc
@@ -28,7 +28,7 @@ 
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete[] (void *ptr, std::size_t) _GLIBCXX_USE_NOEXCEPT
+operator delete[] (void *ptr, std::size_t) noexcept
 {
   ::operator delete[] (ptr);
 }
diff --git a/libstdc++-v3/libsupc++/del_opvsa.cc b/libstdc++-v3/libsupc++/del_opvsa.cc
index 02f18452462..00ea369ee69 100644
--- a/libstdc++-v3/libsupc++/del_opvsa.cc
+++ b/libstdc++-v3/libsupc++/del_opvsa.cc
@@ -27,7 +27,7 @@ 
 #include "new"
 
 _GLIBCXX_WEAK_DEFINITION void
-operator delete[] (void *ptr, std::size_t, std::align_val_t al) _GLIBCXX_USE_NOEXCEPT
+operator delete[] (void *ptr, std::size_t, std::align_val_t al) noexcept
 {
   ::operator delete[] (ptr, al);
 }
diff --git a/libstdc++-v3/libsupc++/new_op.cc b/libstdc++-v3/libsupc++/new_op.cc
index 3caa0bab2ea..df77950cd97 100644
--- a/libstdc++-v3/libsupc++/new_op.cc
+++ b/libstdc++-v3/libsupc++/new_op.cc
@@ -44,7 +44,7 @@  operator new (std::size_t sz) _GLIBCXX_THROW (std::bad_alloc)
   void *p;
 
   /* malloc (0) is unpredictable; avoid it.  */
-  if (sz == 0)
+  if (__builtin_expect (sz == 0, false))
     sz = 1;
 
   while ((p = malloc (sz)) == 0)
diff --git a/libstdc++-v3/libsupc++/new_opa.cc b/libstdc++-v3/libsupc++/new_opa.cc
index a27ff843ca1..aa3e5dc4ce5 100644
--- a/libstdc++-v3/libsupc++/new_opa.cc
+++ b/libstdc++-v3/libsupc++/new_opa.cc
@@ -101,7 +101,6 @@  aligned_alloc (std::size_t al, std::size_t sz)
 _GLIBCXX_WEAK_DEFINITION void *
 operator new (std::size_t sz, std::align_val_t al)
 {
-  void *p;
   std::size_t align = (std::size_t)al;
 
   /* Alignment must be a power of two.  */
@@ -125,8 +124,9 @@  operator new (std::size_t sz, std::align_val_t al)
     sz += align - rem;
 #endif
 
-  using __gnu_cxx::aligned_alloc;
-  while ((p = aligned_alloc (align, sz)) == 0)
+  void *p;
+
+  while ((p = __gnu_cxx::aligned_alloc (align, sz)) == nullptr)
     {
       new_handler handler = std::get_new_handler ();
       if (! handler)
diff --git a/libstdc++-v3/libsupc++/new_opant.cc b/libstdc++-v3/libsupc++/new_opant.cc
index b4458402d02..f08ae0c2ac4 100644
--- a/libstdc++-v3/libsupc++/new_opant.cc
+++ b/libstdc++-v3/libsupc++/new_opant.cc
@@ -29,7 +29,7 @@ 
 
 _GLIBCXX_WEAK_DEFINITION void*
 operator new(std::size_t sz, std::align_val_t al, const std::nothrow_t&)
-  _GLIBCXX_USE_NOEXCEPT
+  noexcept
 {
   __try
     {
@@ -37,6 +37,6 @@  operator new(std::size_t sz, std::align_val_t al, const std::nothrow_t&)
     }
   __catch(...)
     {
-      return 0;
+      return nullptr;
     }
 }
diff --git a/libstdc++-v3/libsupc++/new_opnt.cc b/libstdc++-v3/libsupc++/new_opnt.cc
index faab44e66c2..ffe44b939bb 100644
--- a/libstdc++-v3/libsupc++/new_opnt.cc
+++ b/libstdc++-v3/libsupc++/new_opnt.cc
@@ -32,28 +32,17 @@  using std::bad_alloc;
 extern "C" void *malloc (std::size_t);
 
 _GLIBCXX_WEAK_DEFINITION void *
-operator new (std::size_t sz, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+operator new (std::size_t sz, const std::nothrow_t&) noexcept
 {
-  void *p;
-
-  /* malloc (0) is unpredictable; avoid it.  */
-  if (sz == 0)
-    sz = 1;
-
-  while ((p = malloc (sz)) == 0)
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 206. operator new(size_t, nothrow) may become unlinked to ordinary
+  // operator new if ordinary version replaced
+  __try
     {
-      new_handler handler = std::get_new_handler ();
-      if (! handler)
-	return 0;
-      __try
-	{
-	  handler ();
-	}
-      __catch(const bad_alloc&)
-	{
-	  return 0;
-	}
+      return ::operator new(sz);
+    }
+  __catch (...)
+    {
+      return nullptr;
     }
-
-  return p;
 }
diff --git a/libstdc++-v3/libsupc++/new_opvant.cc b/libstdc++-v3/libsupc++/new_opvant.cc
index faeb4dc2cb2..4ba1268fbe9 100644
--- a/libstdc++-v3/libsupc++/new_opvant.cc
+++ b/libstdc++-v3/libsupc++/new_opvant.cc
@@ -29,7 +29,7 @@ 
 
 _GLIBCXX_WEAK_DEFINITION void*
 operator new[] (std::size_t sz, std::align_val_t al, const std::nothrow_t&)
-  _GLIBCXX_USE_NOEXCEPT
+  noexcept
 {
   __try
     {
@@ -37,6 +37,6 @@  operator new[] (std::size_t sz, std::align_val_t al, const std::nothrow_t&)
     }
   __catch(...)
     {
-      return 0;
+      return nullptr;
     }
 }
diff --git a/libstdc++-v3/libsupc++/new_opvnt.cc b/libstdc++-v3/libsupc++/new_opvnt.cc
index 828a971dafb..3678b8e1ac9 100644
--- a/libstdc++-v3/libsupc++/new_opvnt.cc
+++ b/libstdc++-v3/libsupc++/new_opvnt.cc
@@ -27,8 +27,17 @@ 
 #include "new"
  
 _GLIBCXX_WEAK_DEFINITION void*
-operator new[] (std::size_t sz, const std::nothrow_t& nothrow)
-  _GLIBCXX_USE_NOEXCEPT
+operator new[] (std::size_t sz, const std::nothrow_t&) noexcept
 {
-  return ::operator new(sz, nothrow);
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 206. operator new(size_t, nothrow) may become unlinked to ordinary
+  // operator new if ordinary version replaced
+  __try
+    {
+      return ::operator new[](sz);
+    }
+  __catch (...)
+    {
+      return nullptr;
+    }
 }
diff --git a/libstdc++-v3/testsuite/18_support/new_nothrow.cc b/libstdc++-v3/testsuite/18_support/new_nothrow.cc
new file mode 100644
index 00000000000..362dabf2bcf
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/new_nothrow.cc
@@ -0,0 +1,183 @@ 
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-do run }
+
+#include <new>
+#include <stdlib.h>
+#include <testsuite_hooks.h>
+
+// PR libstdc++/68210
+
+struct MyBadAlloc: std::bad_alloc { };
+
+static bool new_fail;
+static bool bad_alloc_thrown;
+static unsigned new_called;
+static unsigned delete_called;
+static unsigned new_vec_called;
+static unsigned delete_vec_called;
+static unsigned new_handler_called;
+
+static void new_handler ()
+{
+    if (new_handler_called++)
+        throw MyBadAlloc ();
+}
+
+void* operator new (size_t n)
+{
+    static size_t cntr;
+
+    ++new_called;
+
+    for ( ; ; ) {
+        if (void *p = new_fail ? 0 : malloc (n + sizeof n)) {
+            *static_cast<size_t*>(p) = ++cntr;
+            return static_cast<size_t*>(p) + 1;
+        }
+
+        if (std::new_handler h = std::set_new_handler (0)) {
+            std::set_new_handler (h);
+            h ();
+        }
+        else {
+            bad_alloc_thrown = true;
+            throw MyBadAlloc ();
+        }
+    }
+}
+
+void operator delete (void *p)
+{
+    ++delete_called;
+    if (p)
+        free (static_cast<size_t*>(p) - 1);
+}
+
+void* operator new[] (size_t n)
+{
+    ++new_vec_called;
+    return operator new(n);
+}
+
+void operator delete[] (void *p)
+{
+    ++delete_vec_called;
+    operator delete(p);
+}
+
+#if __cplusplus >= 201402L
+void operator delete (void *p, std::size_t)
+{
+  ::operator delete(p);
+}
+void operator delete[] (void *p, std::size_t)
+{
+  ::operator delete[](p);
+}
+#endif
+
+void init()
+{
+    new_fail = false;
+    new_called = 0;
+    delete_called = 0;
+    new_vec_called = 0;
+    delete_vec_called = 0;
+    new_handler_called = 0;
+    std::set_new_handler (0);
+}
+
+void
+test01()
+{
+    init ();
+
+    void *p = operator new (1, std::nothrow);
+
+    VERIFY (p != 0);
+    VERIFY (1 == new_called);
+    VERIFY (0 == new_handler_called);
+    VERIFY (!bad_alloc_thrown);
+
+    operator delete (p, std::nothrow);
+    VERIFY( 1 == delete_called );
+
+    new_fail = true;
+    p = operator new (1, std::nothrow);
+
+    VERIFY (0 == p);
+    VERIFY (2 == new_called);
+    VERIFY (0 == new_handler_called);
+    VERIFY (bad_alloc_thrown);
+
+    new_fail = true;
+    bad_alloc_thrown = false;
+    std::set_new_handler (new_handler);
+    p = operator new (1, std::nothrow);
+
+    VERIFY (0 == p);
+    VERIFY (3 == new_called);
+    VERIFY (2 == new_handler_called);
+    VERIFY (!bad_alloc_thrown);
+}
+
+void
+test02()
+{
+    init ();
+
+    void *p = operator new[] (1, std::nothrow);
+
+    VERIFY (p != 0);
+    VERIFY (1 == new_called);
+    VERIFY (1 == new_vec_called);
+    VERIFY (0 == new_handler_called);
+    VERIFY (!bad_alloc_thrown);
+
+    operator delete[] (p, std::nothrow);
+    VERIFY( 1 == delete_called );
+    VERIFY( 1 == delete_vec_called );
+
+    new_fail = true;
+    p = operator new[] (1, std::nothrow);
+
+    VERIFY (0 == p);
+    VERIFY (2 == new_called);
+    VERIFY (2 == new_vec_called);
+    VERIFY (0 == new_handler_called);
+    VERIFY (bad_alloc_thrown);
+
+    new_fail = true;
+    bad_alloc_thrown = false;
+    std::set_new_handler (new_handler);
+    p = operator new[] (1, std::nothrow);
+
+    VERIFY (0 == p);
+    VERIFY (3 == new_called);
+    VERIFY (3 == new_vec_called);
+    VERIFY (2 == new_handler_called);
+    VERIFY (!bad_alloc_thrown);
+}
+
+
+int main()
+{
+  test01();
+  test02();
+}