Use double-checked locking for this lazy initialization.
llvm-svn: 73653
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3df1978270
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@ -453,8 +453,27 @@ void DerivedType::dropAllTypeUses() {
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if (NumContainedTys != 0) {
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// The type must stay abstract. To do this, we insert a pointer to a type
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// that will never get resolved, thus will always be abstract.
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static Type *AlwaysOpaqueTy = OpaqueType::get();
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static PATypeHolder Holder(AlwaysOpaqueTy);
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static Type *AlwaysOpaqueTy = 0;
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static PATypeHolder* Holder = 0;
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if (!AlwaysOpaqueTy) {
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if (llvm_is_multithreaded()) {
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llvm_acquire_global_lock();
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if (!AlwaysOpaqueTy) {
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Type *tmp = OpaqueType::get();
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PATypeHolder* tmp2 = new PATypeHolder(AlwaysOpaqueTy);
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sys::MemoryFence();
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AlwaysOpaqueTy = tmp;
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Holder = tmp2;
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}
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llvm_release_global_lock();
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} else {
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AlwaysOpaqueTy = OpaqueType::get();
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Holder = new PATypeHolder(AlwaysOpaqueTy);
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}
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}
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ContainedTys[0] = AlwaysOpaqueTy;
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// Change the rest of the types to be Int32Ty's. It doesn't matter what we
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