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95d08bce87
This change adds a new GC strategy for supporting the CoreCLR runtime. This strategy is currently identical to Statepoint-example GC, but is necessary for several upcoming changes specific to CoreCLR, such as: 1. Base-pointers not explicitly reported for interior pointers 2. Different format for stack-map encoding 3. Location of Safe-point polls: polls are only needed before loop-back edges and before tail-calls (not needed at function-entry) 4. Runtime specific handshake between calls to managed/unmanaged functions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237753 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
//===-- CoreCLRGC.cpp - CoreCLR Runtime GC Strategy -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a GCStrategy for the CoreCLR Runtime.
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// The strategy is similar to Statepoint-example GC, but differs from it in
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// certain aspects, such as:
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// 1) Base-pointers need not be explicitly tracked and reported for
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// interior pointers
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// 2) Uses a different format for encoding stack-maps
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// 3) Location of Safe-point polls: polls are only needed before loop-back edges
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// and before tail-calls (not needed at function-entry)
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//
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// The above differences in behavior are to be implemented in upcoming checkins.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/GCStrategy.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Value.h"
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using namespace llvm;
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namespace {
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class CoreCLRGC : public GCStrategy {
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public:
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CoreCLRGC() {
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UseStatepoints = true;
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// These options are all gc.root specific, we specify them so that the
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// gc.root lowering code doesn't run.
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InitRoots = false;
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NeededSafePoints = 0;
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UsesMetadata = false;
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CustomRoots = false;
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}
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Optional<bool> isGCManagedPointer(const Value *V) const override {
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// Method is only valid on pointer typed values.
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PointerType *PT = cast<PointerType>(V->getType());
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// We pick addrspace(1) as our GC managed heap.
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return (1 == PT->getAddressSpace());
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}
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};
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}
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static GCRegistry::Add<CoreCLRGC> X("coreclr",
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"CoreCLR-compatible GC");
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namespace llvm {
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void linkCoreCLRGC() {}
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}
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