mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-30 23:42:52 +01:00
82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
//===-- ErlangGC.cpp - Erlang/OTP GC strategy -------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the Erlang/OTP runtime-compatible garbage collector
|
|
// (e.g. defines safe points, root initialization etc.)
|
|
//
|
|
// The frametable emitter is in ErlangGCPrinter.cpp.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/GCs.h"
|
|
#include "llvm/CodeGen/GCStrategy.h"
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Target/TargetInstrInfo.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
class ErlangGC : public GCStrategy {
|
|
MCSymbol *InsertLabel(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI,
|
|
DebugLoc DL) const;
|
|
public:
|
|
ErlangGC();
|
|
bool findCustomSafePoints(GCFunctionInfo &FI, MachineFunction &MF);
|
|
};
|
|
|
|
}
|
|
|
|
static GCRegistry::Add<ErlangGC>
|
|
X("erlang", "erlang-compatible garbage collector");
|
|
|
|
void llvm::linkErlangGC() { }
|
|
|
|
ErlangGC::ErlangGC() {
|
|
InitRoots = false;
|
|
NeededSafePoints = 1 << GC::PostCall;
|
|
UsesMetadata = true;
|
|
CustomRoots = false;
|
|
CustomSafePoints = true;
|
|
}
|
|
|
|
MCSymbol *ErlangGC::InsertLabel(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI,
|
|
DebugLoc DL) const {
|
|
const TargetInstrInfo* TII = MBB.getParent()->getTarget().getInstrInfo();
|
|
MCSymbol *Label = MBB.getParent()->getContext().CreateTempSymbol();
|
|
BuildMI(MBB, MI, DL, TII->get(TargetOpcode::GC_LABEL)).addSym(Label);
|
|
return Label;
|
|
}
|
|
|
|
bool ErlangGC::findCustomSafePoints(GCFunctionInfo &FI, MachineFunction &MF) {
|
|
for (MachineFunction::iterator BBI = MF.begin(), BBE = MF.end(); BBI != BBE;
|
|
++BBI)
|
|
for (MachineBasicBlock::iterator MI = BBI->begin(), ME = BBI->end();
|
|
MI != ME; ++MI)
|
|
|
|
if (MI->getDesc().isCall()) {
|
|
|
|
// Do not treat tail call sites as safe points.
|
|
if (MI->getDesc().isTerminator())
|
|
continue;
|
|
|
|
/* Code copied from VisitCallPoint(...) */
|
|
MachineBasicBlock::iterator RAI = MI; ++RAI;
|
|
MCSymbol* Label = InsertLabel(*MI->getParent(), RAI, MI->getDebugLoc());
|
|
FI.addSafePoint(GC::PostCall, Label, MI->getDebugLoc());
|
|
}
|
|
|
|
return false;
|
|
}
|