| //===-- CoreCLRGC.cpp - CoreCLR Runtime 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 for the CoreCLR Runtime. |
| // The strategy is similar to Statepoint-example GC, but differs from it in |
| // certain aspects, such as: |
| // 1) Base-pointers need not be explicitly tracked and reported for |
| // interior pointers |
| // 2) Uses a different format for encoding stack-maps |
| // 3) Location of Safe-point polls: polls are only needed before loop-back edges |
| // and before tail-calls (not needed at function-entry) |
| // |
| // The above differences in behavior are to be implemented in upcoming checkins. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/CodeGen/GCStrategy.h" |
| #include "llvm/IR/DerivedTypes.h" |
| #include "llvm/IR/Value.h" |
| |
| using namespace llvm; |
| |
| namespace { |
| class CoreCLRGC : public GCStrategy { |
| public: |
| CoreCLRGC() { |
| 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 Value *V) const override { |
| // Method is only valid on pointer typed values. |
| PointerType *PT = cast<PointerType>(V->getType()); |
| // We pick addrspace(1) as our GC managed heap. |
| return (1 == PT->getAddressSpace()); |
| } |
| }; |
| } |
| |
| static GCRegistry::Add<CoreCLRGC> X("coreclr", "CoreCLR-compatible GC"); |
| |
| namespace llvm { |
| void linkCoreCLRGC() {} |
| } |