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Use atomic increment/decrement for reference counting of Type's.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73588 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-06-17 00:28:49 +00:00
parent 9a3df671ab
commit efdbfc4cef
3 changed files with 9 additions and 7 deletions
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4
include/llvm/System/Atomic.h
View File

@ -24,8 +24,8 @@ namespace llvm {
cas_flag CompareAndSwap(volatile cas_flag* ptr,
cas_flag new_value,
cas_flag old_value);
cas_flag AtomicPostIncrement(volatile cas_flag* ptr);
cas_flag AtomicPostDecrement(volatile cas_flag* ptr);
cas_flag AtomicIncrement(volatile cas_flag* ptr);
cas_flag AtomicDecrement(volatile cas_flag* ptr);
}
}

8
include/llvm/Type.h
View File

@ -14,6 +14,7 @@
#include "llvm/AbstractTypeUser.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/System/Atomic.h"
#include "llvm/ADT/GraphTraits.h"
#include "llvm/ADT/iterator.h"
#include <string>
@ -102,7 +103,7 @@ private:
/// has no AbstractTypeUsers, the type is deleted. This is only sensical for
/// derived types.
///
mutable unsigned RefCount;
mutable sys::cas_flag RefCount;
const Type *getForwardedTypeInternal() const;
@ -337,7 +338,7 @@ public:
void addRef() const {
assert(isAbstract() && "Cannot add a reference to a non-abstract type!");
++RefCount;
sys::AtomicIncrement(&RefCount);
}
void dropRef() const {
@ -346,7 +347,8 @@ public:
// If this is the last PATypeHolder using this object, and there are no
// PATypeHandles using it, the type is dead, delete it now.
if (--RefCount == 0 && AbstractTypeUsers.empty())
sys::cas_flag OldCount = sys::AtomicDecrement(&RefCount);
if (OldCount == 0 && AbstractTypeUsers.empty())
this->destroy();
}

4
lib/System/Atomic.cpp
View File

@ -52,7 +52,7 @@ sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
#endif
}
sys::cas_flag sys::AtomicPostIncrement(volatile sys::cas_flag* ptr) {
sys::cas_flag sys::AtomicIncrement(volatile sys::cas_flag* ptr) {
#if LLVM_MULTITHREADED==0
++(*ptr);
return *ptr;
@ -65,7 +65,7 @@ sys::cas_flag sys::AtomicPostIncrement(volatile sys::cas_flag* ptr) {
#endif
}
sys::cas_flag sys::AtomicPostDecrement(volatile sys::cas_flag* ptr) {
sys::cas_flag sys::AtomicDecrement(volatile sys::cas_flag* ptr) {
#if LLVM_MULTITHREADED==0
--(*ptr);
return *ptr;