mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-23 17:29:19 +00:00
Add a missing file from 225365
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225366 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
28fa9e1e9f
commit
22e5a23311
54
lib/CodeGen/StatepointExampleGC.cpp
Normal file
54
lib/CodeGen/StatepointExampleGC.cpp
Normal file
@ -0,0 +1,54 @@
|
||||
//===-- StatepointDefaultGC.cpp - The default statepoint 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 which serves as an example for the usage
|
||||
// of a statepoint based lowering strategy. This GCStrategy is intended to
|
||||
// suitable as a default implementation usable with any collector which can
|
||||
// consume the standard stackmap format generated by statepoints, uses the
|
||||
// default addrespace to distinguish between gc managed and non-gc managed
|
||||
// pointers, and has reasonable relocation semantics.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/CodeGen/GCStrategy.h"
|
||||
#include "llvm/IR/Value.h"
|
||||
#include "llvm/IR/DerivedTypes.h"
|
||||
|
||||
using namespace llvm;
|
||||
|
||||
namespace {
|
||||
class StatepointGC : public GCStrategy {
|
||||
public:
|
||||
StatepointGC() {
|
||||
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;
|
||||
CustomSafePoints = false;
|
||||
}
|
||||
Optional<bool> isGCManagedPointer(const Value *V) const override {
|
||||
// Method is only valid on pointer typed values.
|
||||
PointerType *PT = cast<PointerType>(V->getType());
|
||||
// For the sake of this example GC, we arbitrarily pick addrspace(1) as our
|
||||
// GC managed heap. We know that a pointer into this heap needs to be
|
||||
// updated and that no other pointer does.
|
||||
return (1 == PT->getAddressSpace());
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
static GCRegistry::Add<StatepointGC>
|
||||
X("statepoint-example", "an example strategy for statepoint");
|
||||
|
||||
namespace llvm {
|
||||
void linkStatepointExampleGC() {}
|
||||
}
|
Loading…
Reference in New Issue
Block a user