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# afe48f9d 23-Jul-2018 Richard Smith <[email protected]>

Fold -Wreturn-stack-address into general initialization lifetime
checking.

llvm-svn: 337743
# d87aab93 17-Jul-2018 Richard Smith <[email protected]>

Restructure checking for, and warning on, lifetime extension.

This change implements C++ DR1696, which makes initialization of a
reference member of a class from a temporary object ill-formed. The
s

Restructure checking for, and warning on, lifetime extension.

This change implements C++ DR1696, which makes initialization of a
reference member of a class from a temporary object ill-formed. The
standard wording here is imprecise, but we interpret it as meaning that
any time a mem-initializer would result in lifetime extension, the
program is ill-formed.

This reinstates r337226, reverted in r337255, with a fix for the
InitializedEntity alignment problem that was breaking ARM buildbots.

llvm-svn: 337329

show more ...


# 0aa117dd 17-Jul-2018 Florian Hahn <[email protected]>

Temporarily revert r337226 "Restructure checking for, and warning on, lifetime extension."

This change breaks on ARM because pointers to clang::InitializedEntity are only
4 byte aligned and do not h

Temporarily revert r337226 "Restructure checking for, and warning on, lifetime extension."

This change breaks on ARM because pointers to clang::InitializedEntity are only
4 byte aligned and do not have 3 bits to store values. A possible solution
would be to change the fields in clang::InitializedEntity to enforce a bigger
alignment requirement.

The error message is

llvm/include/llvm/ADT/PointerIntPair.h:132:3: error: static_assert failed "PointerIntPair with integer size too large for pointer"
static_assert(IntBits <= PtrTraits::NumLowBitsAvailable,
include/llvm/ADT/PointerIntPair.h:73:13: note: in instantiation of template class 'llvm::PointerIntPairInfo<const clang::InitializedEntity *, 3, llvm::PointerLikeTypeTraits<const clang::InitializedEntity *> >' requested here
Value = Info::updateInt(Info::updatePointer(0, PtrVal),
llvm/include/llvm/ADT/PointerIntPair.h:51:5: note: in instantiation of member function 'llvm::PointerIntPair<const clang::InitializedEntity *, 3, (anonymous namespace)::LifetimeKind, llvm::PointerLikeTypeTraits<const clang::InitializedEntity *>, llvm::PointerIntPairInfo<const clang::InitializedEntity *, 3, llvm::PointerLikeTypeTraits<const clang::InitializedEntity *> > >::setPointerAndInt' requested here
setPointerAndInt(PtrVal, IntVal);
^
llvm/tools/clang/lib/Sema/SemaInit.cpp:6237:12: note: in instantiation of member function 'llvm::PointerIntPair<const clang::InitializedEntity *, 3, (anonymous namespace)::LifetimeKind, llvm::PointerLikeTypeTraits<const clang::InitializedEntity *>, llvm::PointerIntPairInfo<const clang::InitializedEntity *, 3, llvm::PointerLikeTypeTraits<const clang::InitializedEntity *> > >::PointerIntPair' requested here
return {Entity, LK_Extended};

Full log here:
http://lab.llvm.org:8011/builders/clang-cmake-armv7-global-isel/builds/1330
http://lab.llvm.org:8011/builders/clang-cmake-armv7-full/builds/1394

llvm-svn: 337255

show more ...


# 0a9969b3 17-Jul-2018 Richard Smith <[email protected]>

Restructure checking for, and warning on, lifetime extension.

This change implements C++ DR1696, which makes initialization of a
reference member of a class from a temporary object ill-formed. The
s

Restructure checking for, and warning on, lifetime extension.

This change implements C++ DR1696, which makes initialization of a
reference member of a class from a temporary object ill-formed. The
standard wording here is imprecise, but we interpret it as meaning that
any time a mem-initializer would result in lifetime extension, the
program is ill-formed.

llvm-svn: 337226

show more ...


Revision tags: llvmorg-6.0.1, llvmorg-6.0.1-rc3, llvmorg-6.0.1-rc2, llvmorg-6.0.1-rc1
# 4e2698ca 10-Apr-2018 Akira Hatanaka <[email protected]>

[ExprConstant] Use an AST node and a version number as a key to create
an APValue and retrieve it from map Temporaries.

The version number is needed when a single AST node is visited multiple
times

[ExprConstant] Use an AST node and a version number as a key to create
an APValue and retrieve it from map Temporaries.

The version number is needed when a single AST node is visited multiple
times and is used to create APValues that are required to be distinct
from each other (for example, MaterializeTemporaryExprs in default
arguments and VarDecls in loops).

rdar://problem/36505742

Differential Revision: https://reviews.llvm.org/D42776

llvm-svn: 329671

show more ...