55 строки
1.8 KiB
C++
55 строки
1.8 KiB
C++
//===-- 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() {}
|
|
}
|