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//===-- 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() {}
}
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