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//===-- GCMetadata.cpp - Garbage collector metadata -----------------------===//
//
// 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 GCFunctionInfo class and GCModuleInfo pass.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/GCMetadata.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Function.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class Printer : public FunctionPass {
static char ID;
raw_ostream &OS;
public:
explicit Printer(raw_ostream &OS) : FunctionPass(ID), OS(OS) {}
const char *getPassName() const override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnFunction(Function &F) override;
bool doFinalization(Module &M) override;
};
}
INITIALIZE_PASS(GCModuleInfo, "collector-metadata",
"Create Garbage Collector Module Metadata", false, false)
// -----------------------------------------------------------------------------
GCFunctionInfo::GCFunctionInfo(const Function &F, GCStrategy &S)
: F(F), S(S), FrameSize(~0LL) {}
GCFunctionInfo::~GCFunctionInfo() {}
// -----------------------------------------------------------------------------
char GCModuleInfo::ID = 0;
GCModuleInfo::GCModuleInfo()
: ImmutablePass(ID) {
initializeGCModuleInfoPass(*PassRegistry::getPassRegistry());
}
GCStrategy *GCModuleInfo::getOrCreateStrategy(const Module *M,
const std::string &Name) {
strategy_map_type::iterator NMI = StrategyMap.find(Name);
if (NMI != StrategyMap.end())
return NMI->getValue();
for (GCRegistry::iterator I = GCRegistry::begin(),
E = GCRegistry::end(); I != E; ++I) {
if (Name == I->getName()) {
std::unique_ptr<GCStrategy> S = I->instantiate();
S->M = M;
S->Name = Name;
StrategyMap[Name] = S.get();
StrategyList.push_back(std::move(S));
return StrategyList.back().get();
}
}
dbgs() << "unsupported GC: " << Name << "\n";
llvm_unreachable(nullptr);
}
GCFunctionInfo &GCModuleInfo::getFunctionInfo(const Function &F) {
assert(!F.isDeclaration() && "Can only get GCFunctionInfo for a definition!");
assert(F.hasGC());
finfo_map_type::iterator I = FInfoMap.find(&F);
if (I != FInfoMap.end())
return *I->second;
GCStrategy *S = getOrCreateStrategy(F.getParent(), F.getGC());
GCFunctionInfo *GFI = S->insertFunctionInfo(F);
FInfoMap[&F] = GFI;
return *GFI;
}
void GCModuleInfo::clear() {
FInfoMap.clear();
StrategyMap.clear();
StrategyList.clear();
}
// -----------------------------------------------------------------------------
char Printer::ID = 0;
FunctionPass *llvm::createGCInfoPrinter(raw_ostream &OS) {
return new Printer(OS);
}
const char *Printer::getPassName() const {
return "Print Garbage Collector Information";
}
void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
FunctionPass::getAnalysisUsage(AU);
AU.setPreservesAll();
AU.addRequired<GCModuleInfo>();
}
static const char *DescKind(GC::PointKind Kind) {
switch (Kind) {
case GC::Loop: return "loop";
case GC::Return: return "return";
case GC::PreCall: return "pre-call";
case GC::PostCall: return "post-call";
}
llvm_unreachable("Invalid point kind");
}
bool Printer::runOnFunction(Function &F) {
if (F.hasGC()) return false;
GCFunctionInfo *FD = &getAnalysis<GCModuleInfo>().getFunctionInfo(F);
OS << "GC roots for " << FD->getFunction().getName() << ":\n";
for (GCFunctionInfo::roots_iterator RI = FD->roots_begin(),
RE = FD->roots_end(); RI != RE; ++RI)
OS << "\t" << RI->Num << "\t" << RI->StackOffset << "[sp]\n";
OS << "GC safe points for " << FD->getFunction().getName() << ":\n";
for (GCFunctionInfo::iterator PI = FD->begin(),
PE = FD->end(); PI != PE; ++PI) {
OS << "\t" << PI->Label->getName() << ": "
<< DescKind(PI->Kind) << ", live = {";
for (GCFunctionInfo::live_iterator RI = FD->live_begin(PI),
RE = FD->live_end(PI);;) {
OS << " " << RI->Num;
if (++RI == RE)
break;
OS << ",";
}
OS << " }\n";
}
return false;
}
bool Printer::doFinalization(Module &M) {
GCModuleInfo *GMI = getAnalysisIfAvailable<GCModuleInfo>();
assert(GMI && "Printer didn't require GCModuleInfo?!");
GMI->clear();
return false;
}
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