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-rw-r--r--contrib/llvm/lib/CodeGen/StatepointExampleGC.cpp55
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diff --git a/contrib/llvm/lib/CodeGen/StatepointExampleGC.cpp b/contrib/llvm/lib/CodeGen/StatepointExampleGC.cpp
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-//===-- StatepointDefaultGC.cpp - The default statepoint GC strategy ------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains a GCStrategy which serves as an example for the usage
-// of a statepoint based lowering strategy. This GCStrategy is intended to
-// suitable as a default implementation usable with any collector which can
-// consume the standard stackmap format generated by statepoints, uses the
-// default addrespace to distinguish between gc managed and non-gc managed
-// pointers, and has reasonable relocation semantics.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/GCStrategy.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Value.h"
-
-using namespace llvm;
-
-namespace {
-class StatepointGC : public GCStrategy {
-public:
- StatepointGC() {
- UseStatepoints = true;
- // These options are all gc.root specific, we specify them so that the
- // gc.root lowering code doesn't run.
- InitRoots = false;
- NeededSafePoints = 0;
- UsesMetadata = false;
- CustomRoots = false;
- }
- Optional<bool> isGCManagedPointer(const Type *Ty) const override {
- // Method is only valid on pointer typed values.
- const PointerType *PT = cast<PointerType>(Ty);
- // For the sake of this example GC, we arbitrarily pick addrspace(1) as our
- // GC managed heap. We know that a pointer into this heap needs to be
- // updated and that no other pointer does. Note that addrspace(1) is used
- // only as an example, it has no special meaning, and is not reserved for
- // GC usage.
- return (1 == PT->getAddressSpace());
- }
-};
-}
-
-static GCRegistry::Add<StatepointGC> X("statepoint-example",
- "an example strategy for statepoint");
-
-namespace llvm {
-void linkStatepointExampleGC() {}
-}