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We need to guard reads of the AbstractTypeUsers list, as well as writes to it. While it would be nice to use a R/W lock here,

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we can't, because it HAS to be recursive.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73617 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-06-17 17:13:54 +00:00
parent e9d683b052
commit 4f0ac58da1
1 changed files with 5 additions and 1 deletions
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6
lib/VMCore/Type.cpp
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@ -46,7 +46,7 @@ AbstractTypeUser::~AbstractTypeUser() {}
// Reader/writer lock used for guarding access to the type maps.
static ManagedStatic<sys::RWMutex> TypeMapLock;
// Lock used for guarding access to AbstractTypeUsers.
// Recursive lock used for guarding access to AbstractTypeUsers.
static ManagedStatic<sys::Mutex> AbstractTypeUsersLock;
// Concrete/Abstract TypeDescriptions - We lazily calculate type descriptions
@ -1544,6 +1544,7 @@ void DerivedType::unlockedRefineAbstractTypeTo(const Type *NewType) {
// will not cause users to drop off of the use list. If we resolve to ourself
// we succeed!
//
if (llvm_is_multithreaded()) AbstractTypeUsersLock->acquire();
while (!AbstractTypeUsers.empty() && NewTy != this) {
AbstractTypeUser *User = AbstractTypeUsers.back();
@ -1559,6 +1560,7 @@ void DerivedType::unlockedRefineAbstractTypeTo(const Type *NewType) {
assert(AbstractTypeUsers.size() != OldSize &&
"AbsTyUser did not remove self from user list!");
}
if (llvm_is_multithreaded()) AbstractTypeUsersLock->release();
// If we were successful removing all users from the type, 'this' will be
// deleted when the last PATypeHolder is destroyed or updated from this type.
@ -1589,6 +1591,7 @@ void DerivedType::notifyUsesThatTypeBecameConcrete() {
DOUT << "typeIsREFINED type: " << (void*)this << " " << *this << "\n";
#endif
if (llvm_is_multithreaded()) AbstractTypeUsersLock->acquire();
unsigned OldSize = AbstractTypeUsers.size(); OldSize=OldSize;
while (!AbstractTypeUsers.empty()) {
AbstractTypeUser *ATU = AbstractTypeUsers.back();
@ -1597,6 +1600,7 @@ void DerivedType::notifyUsesThatTypeBecameConcrete() {
assert(AbstractTypeUsers.size() < OldSize-- &&
"AbstractTypeUser did not remove itself from the use list!");
}
if (llvm_is_multithreaded()) AbstractTypeUsersLock->release();
}
// refineAbstractType - Called when a contained type is found to be more