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Avoid creating lots of pointless opaque types, with short lifetimes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9076 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -401,6 +401,43 @@ OpaqueType::OpaqueType() : DerivedType(OpaqueTyID) {
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}
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// getAlwaysOpaqueTy - This function returns an opaque type. It doesn't matter
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// _which_ opaque type it is, but the opaque type must never get resolved.
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//
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static Type *getAlwaysOpaqueTy() {
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static Type *AlwaysOpaqueTy = OpaqueType::get();
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static PATypeHolder Holder(AlwaysOpaqueTy);
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return AlwaysOpaqueTy;
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}
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//===----------------------------------------------------------------------===//
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// dropAllTypeUses methods - These methods eliminate any possibly recursive type
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// references from a derived type. The type must remain abstract, so we make
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// sure to use an always opaque type as an argument.
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//
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void FunctionType::dropAllTypeUses() {
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ResultType = getAlwaysOpaqueTy();
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ParamTys.clear();
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}
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void ArrayType::dropAllTypeUses() {
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ElementType = getAlwaysOpaqueTy();
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}
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void StructType::dropAllTypeUses() {
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ETypes.clear();
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ETypes.push_back(PATypeHandle(getAlwaysOpaqueTy(), this));
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}
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void PointerType::dropAllTypeUses() {
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ElementType = getAlwaysOpaqueTy();
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}
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// isTypeAbstract - This is a recursive function that walks a type hierarchy
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// calculating whether or not a type is abstract. Worst case it will have to do
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// a lot of traversing if you have some whacko opaque types, but in most cases,
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@ -651,12 +688,6 @@ FunctionType *FunctionType::get(const Type *ReturnType,
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return MT;
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}
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void FunctionType::dropAllTypeUses() {
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ResultType = OpaqueType::get();
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ParamTys.clear();
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}
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//===----------------------------------------------------------------------===//
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// Array Type Factory...
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//
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@ -701,13 +732,6 @@ ArrayType *ArrayType::get(const Type *ElementType, unsigned NumElements) {
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return AT;
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}
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void ArrayType::dropAllTypeUses() {
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ElementType = OpaqueType::get();
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}
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//===----------------------------------------------------------------------===//
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// Struct Type Factory...
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//
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@ -755,11 +779,6 @@ StructType *StructType::get(const std::vector<const Type*> &ETypes) {
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return ST;
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}
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void StructType::dropAllTypeUses() {
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ETypes.clear();
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ETypes.push_back(PATypeHandle(OpaqueType::get(), this));
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}
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//===----------------------------------------------------------------------===//
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@ -806,10 +825,6 @@ PointerType *PointerType::get(const Type *ValueType) {
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return PT;
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}
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void PointerType::dropAllTypeUses() {
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ElementType = OpaqueType::get();
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}
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void debug_type_tables() {
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FunctionTypes.dump();
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ArrayTypes.dump();
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