[llvm] r233310 - [ADT][CMake][AutoConf] Fail-fast iterators for DenseMap
Sanjoy Das
sanjoy at playingwithpointers.com
Thu Mar 26 12:25:02 PDT 2015
Author: sanjoy
Date: Thu Mar 26 14:25:01 2015
New Revision: 233310
URL: http://llvm.org/viewvc/llvm-project?rev=233310&view=rev
Log:
[ADT][CMake][AutoConf] Fail-fast iterators for DenseMap
Summary:
This patch is an attempt at making `DenseMapIterator`s "fail-fast".
Fail-fast iterators that have been invalidated due to insertion into
the host `DenseMap` deterministically trip an assert (in debug mode)
on access, instead of non-deterministically hitting memory corruption
issues.
Enabling fail-fast iterators breaks the LLVM C++ ABI, so they are
predicated on `LLVM_ENABLE_ABI_BREAKING_CHECKS`.
`LLVM_ENABLE_ABI_BREAKING_CHECKS` by default flips with
`LLVM_ENABLE_ASSERTS`, but can be clamped to ON or OFF using the CMake /
autoconf build system.
Reviewers: chandlerc, dexonsmith, rnk, zturner
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D8351
Added:
llvm/trunk/include/llvm/ADT/EpochTracker.h
Modified:
llvm/trunk/CMakeLists.txt
llvm/trunk/autoconf/configure.ac
llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
llvm/trunk/configure
llvm/trunk/docs/CMake.rst
llvm/trunk/docs/ProgrammersManual.rst
llvm/trunk/include/llvm/ADT/DenseMap.h
llvm/trunk/include/llvm/Config/config.h.in
llvm/trunk/include/llvm/Config/llvm-config.h.cmake
llvm/trunk/include/llvm/Config/llvm-config.h.in
Modified: llvm/trunk/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/CMakeLists.txt?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/CMakeLists.txt (original)
+++ llvm/trunk/CMakeLists.txt Thu Mar 26 14:25:01 2015
@@ -252,6 +252,9 @@ else()
option(LLVM_ENABLE_ASSERTIONS "Enable assertions" ON)
endif()
+set(LLVM_ABI_BREAKING_CHECKS "WITH_ASSERTS" CACHE STRING
+ "Enable abi-breaking checks. Can be WITH_ASSERTS, FORCE_ON or FORCE_OFF.")
+
option(LLVM_FORCE_USE_OLD_HOST_TOOLCHAIN
"Set to ON to force using an old, unsupported host toolchain." OFF)
Modified: llvm/trunk/autoconf/configure.ac
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/autoconf/configure.ac?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/autoconf/configure.ac (original)
+++ llvm/trunk/autoconf/configure.ac Thu Mar 26 14:25:01 2015
@@ -701,8 +701,10 @@ AC_ARG_ENABLE(assertions,AS_HELP_STRING(
--enable-assertions,[Compile with assertion checks enabled (default is YES)]),, enableval="yes")
if test ${enableval} = "yes" ; then
AC_SUBST(DISABLE_ASSERTIONS,[[]])
+ assertions_enabled="yes"
else
AC_SUBST(DISABLE_ASSERTIONS,[[DISABLE_ASSERTIONS=1]])
+ assertions_enabled="no"
fi
dnl --enable-werror : check whether we want Werror on by default
@@ -726,6 +728,20 @@ else
AC_SUBST(EXPENSIVE_CHECKS,[[no]])
fi
+dnl --enable-abi-breaking-checks : decide whether we should compile in asserts and
+dnl checks that make the build ABI incompatible with an llvm built without these
+dnl checks enabled.
+AC_ARG_ENABLE(abi-breaking-checks,AS_HELP_STRING(
+ --enable-abi-breaking-checks,[Compile with abi-breaking asserts support (default is with-asserts)]),, enableval="with-asserts")
+case "$enableval" in
+ with-asserts) if test ${assertions_enabled} = "yes" ; then
+ AC_DEFINE([LLVM_ENABLE_ABI_BREAKING_CHECKS],[1],[Define to enable checks that alter the LLVM C++ ABI])
+ fi ;;
+ yes) AC_DEFINE([LLVM_ENABLE_ABI_BREAKING_CHECKS],[1],[Define to enable checks that alter the LLVM C++ ABI]) ;;
+ no) ;;
+ *) AC_MSG_ERROR([Invalid setting for --enable-abi-breaking-checks. Use "with-asserts", "yes" or "no"])
+esac
+
dnl --enable-debug-runtime : should runtime libraries have debug symbols?
AC_ARG_ENABLE(debug-runtime,
AS_HELP_STRING(--enable-debug-runtime,[Build runtime libs with debug symbols (default is NO)]),,enableval=no)
Modified: llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/HandleLLVMOptions.cmake?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/cmake/modules/HandleLLVMOptions.cmake (original)
+++ llvm/trunk/cmake/modules/HandleLLVMOptions.cmake Thu Mar 26 14:25:01 2015
@@ -78,6 +78,20 @@ if( LLVM_ENABLE_ASSERTIONS )
endif()
endif()
+string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS)
+
+if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" )
+ if( LLVM_ENABLE_ASSERTIONS )
+ set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
+ endif()
+elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" )
+ set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
+elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" )
+ # We don't need to do anything special to turn off ABI breaking checks.
+else()
+ message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!")
+endif()
+
if(WIN32)
set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
if(CYGWIN)
Modified: llvm/trunk/configure
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/configure?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/configure (original)
+++ llvm/trunk/configure Thu Mar 26 14:25:01 2015
@@ -1426,6 +1426,9 @@ Optional Features:
--enable-expensive-checks
Compile with expensive debug checks enabled (default
is NO)
+ --enable-abi-breaking-checks
+ Compile with abi-breaking asserts support (default
+ is with-asserts)
--enable-debug-runtime Build runtime libs with debug symbols (default is
NO)
--enable-debug-symbols Build compiler with debug symbols (default is NO if
@@ -4980,9 +4983,11 @@ fi
if test ${enableval} = "yes" ; then
DISABLE_ASSERTIONS=
+ assertions_enabled="yes"
else
DISABLE_ASSERTIONS=DISABLE_ASSERTIONS=1
+ assertions_enabled="no"
fi
# Check whether --enable-werror was given.
@@ -5023,6 +5028,32 @@ else
fi
+# Check whether --enable-abi-breaking-checks was given.
+if test "${enable_abi_breaking_checks+set}" = set; then
+ enableval=$enable_abi_breaking_checks;
+else
+ enableval="with-asserts"
+fi
+
+case "$enableval" in
+ with-asserts) if test ${assertions_enabled} = "yes" ; then
+
+cat >>confdefs.h <<\_ACEOF
+#define LLVM_ENABLE_ABI_BREAKING_CHECKS 1
+_ACEOF
+
+ fi ;;
+ yes)
+cat >>confdefs.h <<\_ACEOF
+#define LLVM_ENABLE_ABI_BREAKING_CHECKS 1
+_ACEOF
+ ;;
+ no) ;;
+ *) { { echo "$as_me:$LINENO: error: Invalid setting for --enable-abi-breaking-checks. Use \"with-asserts\", \"yes\" or \"no\"" >&5
+echo "$as_me: error: Invalid setting for --enable-abi-breaking-checks. Use \"with-asserts\", \"yes\" or \"no\"" >&2;}
+ { (exit 1); exit 1; }; }
+esac
+
# Check whether --enable-debug-runtime was given.
if test "${enable_debug_runtime+set}" = set; then
enableval=$enable_debug_runtime;
Modified: llvm/trunk/docs/CMake.rst
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/CMake.rst?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/docs/CMake.rst (original)
+++ llvm/trunk/docs/CMake.rst Thu Mar 26 14:25:01 2015
@@ -270,6 +270,15 @@ LLVM-specific variables
**LLVM_ENABLE_WERROR**:BOOL
Stop and fail build, if a compiler warning is triggered. Defaults to OFF.
+**LLVM_ABI_BREAKING_CHECKS**:STRING
+ Used to decide if LLVM should be built with ABI breaking checks or
+ not. Allowed values are `WITH_ASSERTS` (default), `FORCE_ON` and
+ `FORCE_OFF`. `WITH_ASSERTS` turns on ABI breaking checks in an
+ assertion enabled build. `FORCE_ON` (`FORCE_OFF`) turns them on
+ (off) irrespective of whether normal (`NDEBUG` based) assertions are
+ enabled or not. A version of LLVM built with ABI breaking checks
+ is not ABI compatible with a version built without it.
+
**LLVM_BUILD_32_BITS**:BOOL
Build 32-bits executables and libraries on 64-bits systems. This option is
available only on some 64-bits unix systems. Defaults to OFF.
Modified: llvm/trunk/docs/ProgrammersManual.rst
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/ProgrammersManual.rst?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/docs/ProgrammersManual.rst (original)
+++ llvm/trunk/docs/ProgrammersManual.rst Thu Mar 26 14:25:01 2015
@@ -2553,6 +2553,22 @@ section on :ref:`isa and dyn_cast <isa>`
<HowToSetUpLLVMStyleRTTI>` which describes how you can implement this
pattern for use with the LLVM helpers.
+.. _abi_breaking_checks:
+
+ABI Breaking Checks
+-------------------
+
+Checks and asserts that alter the LLVM C++ ABI are predicated on the
+preprocessor symbol `LLVM_ENABLE_ABI_BREAKING_CHECKS` -- LLVM
+libraries built with `LLVM_ENABLE_ABI_BREAKING_CHECKS` are not ABI
+compatible LLVM libraries built without it defined. By default,
+turning on assertions also turns on `LLVM_ENABLE_ABI_BREAKING_CHECKS`
+so a default +Asserts build is not ABI compatible with a
+default -Asserts build. Clients that want ABI compatibility
+between +Asserts and -Asserts builds should use the CMake or autoconf
+build systems to set `LLVM_ENABLE_ABI_BREAKING_CHECKS` independently
+of `LLVM_ENABLE_ASSERTIONS`.
+
.. _coreclasses:
The Core LLVM Class Hierarchy Reference
Modified: llvm/trunk/include/llvm/ADT/DenseMap.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/DenseMap.h?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/include/llvm/ADT/DenseMap.h (original)
+++ llvm/trunk/include/llvm/ADT/DenseMap.h Thu Mar 26 14:25:01 2015
@@ -15,6 +15,7 @@
#define LLVM_ADT_DENSEMAP_H
#include "llvm/ADT/DenseMapInfo.h"
+#include "llvm/ADT/EpochTracker.h"
#include "llvm/Support/AlignOf.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MathExtras.h"
@@ -50,7 +51,7 @@ class DenseMapIterator;
template <typename DerivedT, typename KeyT, typename ValueT, typename KeyInfoT,
typename BucketT>
-class DenseMapBase {
+class DenseMapBase : public DebugEpochBase {
public:
typedef unsigned size_type;
typedef KeyT key_type;
@@ -62,16 +63,17 @@ public:
const_iterator;
inline iterator begin() {
// When the map is empty, avoid the overhead of AdvancePastEmptyBuckets().
- return empty() ? end() : iterator(getBuckets(), getBucketsEnd());
+ return empty() ? end() : iterator(getBuckets(), getBucketsEnd(), *this);
}
inline iterator end() {
- return iterator(getBucketsEnd(), getBucketsEnd(), true);
+ return iterator(getBucketsEnd(), getBucketsEnd(), *this, true);
}
inline const_iterator begin() const {
- return empty() ? end() : const_iterator(getBuckets(), getBucketsEnd());
+ return empty() ? end()
+ : const_iterator(getBuckets(), getBucketsEnd(), *this);
}
inline const_iterator end() const {
- return const_iterator(getBucketsEnd(), getBucketsEnd(), true);
+ return const_iterator(getBucketsEnd(), getBucketsEnd(), *this, true);
}
bool LLVM_ATTRIBUTE_UNUSED_RESULT empty() const {
@@ -81,11 +83,13 @@ public:
/// Grow the densemap so that it has at least Size buckets. Does not shrink
void resize(size_type Size) {
+ incrementEpoch();
if (Size > getNumBuckets())
grow(Size);
}
void clear() {
+ incrementEpoch();
if (getNumEntries() == 0 && getNumTombstones() == 0) return;
// If the capacity of the array is huge, and the # elements used is small,
@@ -118,13 +122,13 @@ public:
iterator find(const KeyT &Val) {
BucketT *TheBucket;
if (LookupBucketFor(Val, TheBucket))
- return iterator(TheBucket, getBucketsEnd(), true);
+ return iterator(TheBucket, getBucketsEnd(), *this, true);
return end();
}
const_iterator find(const KeyT &Val) const {
const BucketT *TheBucket;
if (LookupBucketFor(Val, TheBucket))
- return const_iterator(TheBucket, getBucketsEnd(), true);
+ return const_iterator(TheBucket, getBucketsEnd(), *this, true);
return end();
}
@@ -137,14 +141,14 @@ public:
iterator find_as(const LookupKeyT &Val) {
BucketT *TheBucket;
if (LookupBucketFor(Val, TheBucket))
- return iterator(TheBucket, getBucketsEnd(), true);
+ return iterator(TheBucket, getBucketsEnd(), *this, true);
return end();
}
template<class LookupKeyT>
const_iterator find_as(const LookupKeyT &Val) const {
const BucketT *TheBucket;
if (LookupBucketFor(Val, TheBucket))
- return const_iterator(TheBucket, getBucketsEnd(), true);
+ return const_iterator(TheBucket, getBucketsEnd(), *this, true);
return end();
}
@@ -163,12 +167,13 @@ public:
std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT> &KV) {
BucketT *TheBucket;
if (LookupBucketFor(KV.first, TheBucket))
- return std::make_pair(iterator(TheBucket, getBucketsEnd(), true),
+ return std::make_pair(iterator(TheBucket, getBucketsEnd(), *this, true),
false); // Already in map.
// Otherwise, insert the new element.
TheBucket = InsertIntoBucket(KV.first, KV.second, TheBucket);
- return std::make_pair(iterator(TheBucket, getBucketsEnd(), true), true);
+ return std::make_pair(iterator(TheBucket, getBucketsEnd(), *this, true),
+ true);
}
// Inserts key,value pair into the map if the key isn't already in the map.
@@ -177,14 +182,15 @@ public:
std::pair<iterator, bool> insert(std::pair<KeyT, ValueT> &&KV) {
BucketT *TheBucket;
if (LookupBucketFor(KV.first, TheBucket))
- return std::make_pair(iterator(TheBucket, getBucketsEnd(), true),
+ return std::make_pair(iterator(TheBucket, getBucketsEnd(), *this, true),
false); // Already in map.
-
+
// Otherwise, insert the new element.
TheBucket = InsertIntoBucket(std::move(KV.first),
std::move(KV.second),
TheBucket);
- return std::make_pair(iterator(TheBucket, getBucketsEnd(), true), true);
+ return std::make_pair(iterator(TheBucket, getBucketsEnd(), *this, true),
+ true);
}
/// insert - Range insertion of pairs.
@@ -431,6 +437,8 @@ private:
}
BucketT *InsertIntoBucketImpl(const KeyT &Key, BucketT *TheBucket) {
+ incrementEpoch();
+
// If the load of the hash table is more than 3/4, or if fewer than 1/8 of
// the buckets are empty (meaning that many are filled with tombstones),
// grow the table.
@@ -987,9 +995,10 @@ private:
template <typename KeyT, typename ValueT, typename KeyInfoT, typename Bucket,
bool IsConst>
-class DenseMapIterator {
+class DenseMapIterator : DebugEpochBase::HandleBase {
typedef DenseMapIterator<KeyT, ValueT, KeyInfoT, Bucket, true> ConstIterator;
friend class DenseMapIterator<KeyT, ValueT, KeyInfoT, Bucket, true>;
+ friend class DenseMapIterator<KeyT, ValueT, KeyInfoT, Bucket, false>;
public:
typedef ptrdiff_t difference_type;
@@ -1003,8 +1012,10 @@ private:
public:
DenseMapIterator() : Ptr(nullptr), End(nullptr) {}
- DenseMapIterator(pointer Pos, pointer E, bool NoAdvance = false)
- : Ptr(Pos), End(E) {
+ DenseMapIterator(pointer Pos, pointer E, const DebugEpochBase &Epoch,
+ bool NoAdvance = false)
+ : DebugEpochBase::HandleBase(&Epoch), Ptr(Pos), End(E) {
+ assert(isHandleInSync() && "invalid construction!");
if (!NoAdvance) AdvancePastEmptyBuckets();
}
@@ -1015,28 +1026,40 @@ public:
typename = typename std::enable_if<!IsConstSrc && IsConst>::type>
DenseMapIterator(
const DenseMapIterator<KeyT, ValueT, KeyInfoT, Bucket, IsConstSrc> &I)
- : Ptr(I.Ptr), End(I.End) {}
+ : DebugEpochBase::HandleBase(I), Ptr(I.Ptr), End(I.End) {}
reference operator*() const {
+ assert(isHandleInSync() && "invalid iterator access!");
return *Ptr;
}
pointer operator->() const {
+ assert(isHandleInSync() && "invalid iterator access!");
return Ptr;
}
bool operator==(const ConstIterator &RHS) const {
- return Ptr == RHS.operator->();
+ assert((!Ptr || isHandleInSync()) && "handle not in sync!");
+ assert((!RHS.Ptr || RHS.isHandleInSync()) && "handle not in sync!");
+ assert(getEpochAddress() == RHS.getEpochAddress() &&
+ "comparing incomparable iterators!");
+ return Ptr == RHS.Ptr;
}
bool operator!=(const ConstIterator &RHS) const {
- return Ptr != RHS.operator->();
+ assert((!Ptr || isHandleInSync()) && "handle not in sync!");
+ assert((!RHS.Ptr || RHS.isHandleInSync()) && "handle not in sync!");
+ assert(getEpochAddress() == RHS.getEpochAddress() &&
+ "comparing incomparable iterators!");
+ return Ptr != RHS.Ptr;
}
inline DenseMapIterator& operator++() { // Preincrement
+ assert(isHandleInSync() && "invalid iterator access!");
++Ptr;
AdvancePastEmptyBuckets();
return *this;
}
DenseMapIterator operator++(int) { // Postincrement
+ assert(isHandleInSync() && "invalid iterator access!");
DenseMapIterator tmp = *this; ++*this; return tmp;
}
Added: llvm/trunk/include/llvm/ADT/EpochTracker.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/EpochTracker.h?rev=233310&view=auto
==============================================================================
--- llvm/trunk/include/llvm/ADT/EpochTracker.h (added)
+++ llvm/trunk/include/llvm/ADT/EpochTracker.h Thu Mar 26 14:25:01 2015
@@ -0,0 +1,99 @@
+//===- llvm/ADT/EpochTracker.h - ADT epoch tracking --------------*- C++ -*-==//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the DebugEpochBase and DebugEpochBase::HandleBase classes.
+// These can be used to write iterators that are fail-fast when LLVM is built
+// with asserts enabled.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_EPOCH_TRACKER_H
+#define LLVM_ADT_EPOCH_TRACKER_H
+
+#include "llvm/Config/llvm-config.h"
+
+#include <cstdint>
+
+namespace llvm {
+
+#ifndef LLVM_ENABLE_ABI_BREAKING_CHECKS
+
+class DebugEpochBase {
+public:
+ void incrementEpoch() {}
+
+ class HandleBase {
+ public:
+ HandleBase() {}
+ explicit HandleBase(const DebugEpochBase *) {}
+ bool isHandleInSync() const { return true; }
+ const void *getEpochAddress() const { return nullptr; }
+ };
+};
+
+#else
+
+/// \brief A base class for data structure classes wishing to make iterators
+/// ("handles") pointing into themselves fail-fast. When building without
+/// asserts, this class is empty and does nothing.
+///
+/// DebugEpochBase does not by itself track handles pointing into itself. The
+/// expectation is that routines touching the handles will poll on
+/// isHandleInSync at appropriate points to assert that the handle they're using
+/// is still valid.
+///
+class DebugEpochBase {
+ uint64_t Epoch;
+
+public:
+ DebugEpochBase() : Epoch(0) {}
+
+ /// \brief Calling incrementEpoch invalidates all handles pointing into the
+ /// calling instance.
+ void incrementEpoch() { ++Epoch; }
+
+ /// \brief The destructor calls incrementEpoch to make use-after-free bugs
+ /// more likely to crash deterministically.
+ ~DebugEpochBase() { incrementEpoch(); }
+
+ /// \brief A base class for iterator classes ("handles") that wish to poll for
+ /// iterator invalidating modifications in the underlying data structure.
+ /// When LLVM is built without asserts, this class is empty and does nothing.
+ ///
+ /// HandleBase does not track the parent data structure by itself. It expects
+ /// the routines modifying the data structure to call incrementEpoch when they
+ /// make an iterator-invalidating modification.
+ ///
+ class HandleBase {
+ const uint64_t *EpochAddress;
+ uint64_t EpochAtCreation;
+
+ public:
+ HandleBase() : EpochAddress(nullptr), EpochAtCreation(UINT64_MAX) {}
+
+ explicit HandleBase(const DebugEpochBase *Parent)
+ : EpochAddress(&Parent->Epoch), EpochAtCreation(Parent->Epoch) {}
+
+ /// \brief Returns true if the DebugEpochBase this Handle is linked to has
+ /// not called incrementEpoch on itself since the creation of this
+ /// HandleBase instance.
+ bool isHandleInSync() const { return *EpochAddress == EpochAtCreation; }
+
+ /// \brief Returns a pointer to the epoch word stored in the data structure
+ /// this handle points into. Can be used to check if two iterators point
+ /// into the same data structure.
+ const void *getEpochAddress() const { return EpochAddress; }
+ };
+};
+
+#endif // LLVM_ENABLE_ABI_BREAKING_CHECKS
+
+} // namespace llvm
+
+#endif
Modified: llvm/trunk/include/llvm/Config/config.h.in
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Config/config.h.in?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Config/config.h.in (original)
+++ llvm/trunk/include/llvm/Config/config.h.in Thu Mar 26 14:25:01 2015
@@ -417,6 +417,9 @@
/* Installation directory for documentation */
#undef LLVM_DOCSDIR
+/* Define to enable checks that alter the LLVM C++ ABI */
+#undef LLVM_ENABLE_ABI_BREAKING_CHECKS
+
/* Define if threads enabled */
#undef LLVM_ENABLE_THREADS
Modified: llvm/trunk/include/llvm/Config/llvm-config.h.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Config/llvm-config.h.cmake?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Config/llvm-config.h.cmake (original)
+++ llvm/trunk/include/llvm/Config/llvm-config.h.cmake Thu Mar 26 14:25:01 2015
@@ -101,4 +101,8 @@
/* Define if we link Polly to the tools */
#cmakedefine LINK_POLLY_INTO_TOOLS
+/* Define if LLVM is built with asserts and checks that change the layout of
+ client-visible data structures. */
+#cmakedefine LLVM_ENABLE_ABI_BREAKING_CHECKS
+
#endif
Modified: llvm/trunk/include/llvm/Config/llvm-config.h.in
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Config/llvm-config.h.in?rev=233310&r1=233309&r2=233310&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Config/llvm-config.h.in (original)
+++ llvm/trunk/include/llvm/Config/llvm-config.h.in Thu Mar 26 14:25:01 2015
@@ -98,4 +98,7 @@
/* LLVM version string */
#undef LLVM_VERSION_STRING
+/* Define to enable checks that alter the LLVM C++ ABI */
+#undef LLVM_ENABLE_ABI_BREAKING_CHECKS
+
#endif
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