1 //===-- CoreCLRGC.cpp - CoreCLR Runtime GC Strategy -----------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains a GCStrategy for the CoreCLR Runtime. 11 // The strategy is similar to Statepoint-example GC, but differs from it in 12 // certain aspects, such as: 13 // 1) Base-pointers need not be explicitly tracked and reported for 14 // interior pointers 15 // 2) Uses a different format for encoding stack-maps 16 // 3) Location of Safe-point polls: polls are only needed before loop-back edges 17 // and before tail-calls (not needed at function-entry) 18 // 19 // The above differences in behavior are to be implemented in upcoming checkins. 20 // 21 //===----------------------------------------------------------------------===// 22 23 #include "llvm/CodeGen/GCStrategy.h" 24 #include "llvm/IR/DerivedTypes.h" 25 #include "llvm/IR/Value.h" 26 27 using namespace llvm; 28 29 namespace { 30 class CoreCLRGC : public GCStrategy { 31 public: 32 CoreCLRGC() { 33 UseStatepoints = true; 34 // These options are all gc.root specific, we specify them so that the 35 // gc.root lowering code doesn't run. 36 InitRoots = false; 37 NeededSafePoints = 0; 38 UsesMetadata = false; 39 CustomRoots = false; 40 } 41 Optional<bool> isGCManagedPointer(const Value *V) const override { 42 // Method is only valid on pointer typed values. 43 PointerType *PT = cast<PointerType>(V->getType()); 44 // We pick addrspace(1) as our GC managed heap. 45 return (1 == PT->getAddressSpace()); 46 } 47 }; 48 } 49 50 static GCRegistry::Add<CoreCLRGC> X("coreclr", "CoreCLR-compatible GC"); 51 52 namespace llvm { 53 void linkCoreCLRGC() {} 54 } 55
