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It includes: - location and of each safe point in machine code (identified by a label) - location of each root within the stack frame (identified by an offset), including the metadata tag provided to llvm.gcroot in the user program - size of the stack frame (for collectors which want to cheat on stack crawling :) - and eventually will include liveness It is to be populated by back-ends during code-generation. CollectorModuleMetadata aggregates this information across the entire module. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42418 91177308-0d34-0410-b5e6-96231b3b80d8
186 lines
5.1 KiB
C++
186 lines
5.1 KiB
C++
//===-- CollectorMetadata.cpp - Garbage collector metadata ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Gordon Henriksen and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the CollectorMetadata and CollectorModuleMetadata
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// classes.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/CollectorMetadata.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Function.h"
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#include "llvm/Support/Compiler.h"
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN Printer : public MachineFunctionPass {
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static char ID;
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std::ostream &OS;
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public:
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Printer(std::ostream &OS = *cerr);
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const char *getPassName() const;
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void getAnalysisUsage(AnalysisUsage &AU) const;
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bool runOnMachineFunction(MachineFunction &MF);
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};
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class VISIBILITY_HIDDEN Deleter : public MachineFunctionPass {
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static char ID;
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public:
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Deleter();
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const char *getPassName() const;
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void getAnalysisUsage(AnalysisUsage &AU) const;
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bool runOnMachineFunction(MachineFunction &MF);
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bool doFinalization(Module &M);
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};
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RegisterPass<CollectorModuleMetadata>
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X("collector-metadata", "Create Garbage Collector Module Metadata");
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}
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// -----------------------------------------------------------------------------
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CollectorMetadata::CollectorMetadata(const Function &F)
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: F(F), FrameSize(~0LL) {}
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CollectorMetadata::~CollectorMetadata() {}
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// -----------------------------------------------------------------------------
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char CollectorModuleMetadata::ID = 0;
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CollectorModuleMetadata::CollectorModuleMetadata()
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: ImmutablePass((intptr_t)&ID) {}
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CollectorModuleMetadata::~CollectorModuleMetadata() {
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clear();
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}
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CollectorMetadata& CollectorModuleMetadata::insert(const Function *F) {
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assert(Map.find(F) == Map.end() && "Function GC metadata already exists!");
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CollectorMetadata *FMD = new CollectorMetadata(*F);
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Functions.push_back(FMD);
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Map[F] = FMD;
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return *FMD;
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}
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CollectorMetadata* CollectorModuleMetadata::get(const Function *F) const {
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map_type::iterator I = Map.find(F);
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if (I == Map.end())
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return 0;
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return I->second;
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}
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void CollectorModuleMetadata::clear() {
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for (iterator I = begin(), E = end(); I != E; ++I)
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delete *I;
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Functions.clear();
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Map.clear();
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}
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// -----------------------------------------------------------------------------
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char Printer::ID = 0;
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Pass *llvm::createCollectorMetadataPrinter(std::ostream &OS) {
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return new Printer(OS);
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}
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Printer::Printer(std::ostream &OS)
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: MachineFunctionPass(intptr_t(&ID)), OS(OS) {}
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const char *Printer::getPassName() const {
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return "Print Garbage Collector Information";
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}
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void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
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MachineFunctionPass::getAnalysisUsage(AU);
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AU.setPreservesAll();
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AU.addRequired<CollectorModuleMetadata>();
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}
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static const char *DescKind(GC::PointKind Kind) {
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switch (Kind) {
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default: assert(0 && "Unknown GC point kind");
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case GC::Loop: return "loop";
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case GC::Return: return "return";
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case GC::PreCall: return "pre-call";
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case GC::PostCall: return "post-call";
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}
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}
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bool Printer::runOnMachineFunction(MachineFunction &MF) {
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if (CollectorMetadata *FD =
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getAnalysis<CollectorModuleMetadata>().get(MF.getFunction())) {
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OS << "GC roots for " << FD->getFunction().getNameStart() << ":\n";
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for (CollectorMetadata::roots_iterator RI = FD->roots_begin(),
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RE = FD->roots_end();
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RI != RE; ++RI)
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OS << "\t" << RI->Num << "\t" << RI->StackOffset << "[sp]\n";
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OS << "GC safe points for " << FD->getFunction().getNameStart() << ":\n";
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for (CollectorMetadata::iterator PI = FD->begin(),
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PE = FD->end(); PI != PE; ++PI) {
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OS << "\tlabel " << PI->Num << ": " << DescKind(PI->Kind) << ", live = {";
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for (CollectorMetadata::live_iterator RI = FD->live_begin(PI),
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RE = FD->live_end(PI);;) {
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OS << " " << RI->Num;
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if (++RI == RE)
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break;
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OS << ",";
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}
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OS << " }\n";
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}
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}
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return false;
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}
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// -----------------------------------------------------------------------------
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char Deleter::ID = 0;
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Pass *llvm::createCollectorMetadataDeleter() {
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return new Deleter();
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}
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Deleter::Deleter() : MachineFunctionPass(intptr_t(&ID)) {}
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const char *Deleter::getPassName() const {
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return "Delete Garbage Collector Information";
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}
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void Deleter::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<CollectorModuleMetadata>();
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}
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bool Deleter::runOnMachineFunction(MachineFunction &MF) {
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return false;
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}
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bool Deleter::doFinalization(Module &M) {
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getAnalysis<CollectorModuleMetadata>().clear();
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return false;
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}
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