1 //===-- GCMetadata.cpp - Garbage collector metadata -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the GCFunctionInfo class and GCModuleInfo pass.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/GCMetadata.h"
15 #include "llvm/CodeGen/MachineFrameInfo.h"
16 #include "llvm/CodeGen/Passes.h"
17 #include "llvm/IR/Function.h"
18 #include "llvm/IR/GCStrategy.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/Pass.h"
21 #include "llvm/Support/Debug.h"
22 #include "llvm/Support/ErrorHandling.h"
23 #include "llvm/Support/raw_ostream.h"
28 class Printer : public FunctionPass {
33 explicit Printer(raw_ostream &OS) : FunctionPass(ID), OS(OS) {}
36 const char *getPassName() const override;
37 void getAnalysisUsage(AnalysisUsage &AU) const override;
39 bool runOnFunction(Function &F) override;
40 bool doFinalization(Module &M) override;
45 INITIALIZE_PASS(GCModuleInfo, "collector-metadata",
46 "Create Garbage Collector Module Metadata", false, false)
48 // -----------------------------------------------------------------------------
50 GCFunctionInfo::GCFunctionInfo(const Function &F, GCStrategy &S)
51 : F(F), S(S), FrameSize(~0LL) {}
53 GCFunctionInfo::~GCFunctionInfo() {}
55 // -----------------------------------------------------------------------------
57 char GCModuleInfo::ID = 0;
59 GCModuleInfo::GCModuleInfo()
61 initializeGCModuleInfoPass(*PassRegistry::getPassRegistry());
64 GCFunctionInfo &GCModuleInfo::getFunctionInfo(const Function &F) {
65 assert(!F.isDeclaration() && "Can only get GCFunctionInfo for a definition!");
68 finfo_map_type::iterator I = FInfoMap.find(&F);
69 if (I != FInfoMap.end())
72 GCStrategy *S = F.getGCStrategy();
74 std::string error = std::string("unsupported GC: ") + F.getGC();
75 report_fatal_error(error);
77 // Save the fact this strategy is associated with this module. Note that
78 // these are non-owning references, the GCStrategy remains owned by the
80 StrategyList.push_back(S);
81 Functions.push_back(make_unique<GCFunctionInfo>(F, *S));
82 GCFunctionInfo *GFI = Functions.back().get();
87 void GCModuleInfo::clear() {
93 // -----------------------------------------------------------------------------
97 FunctionPass *llvm::createGCInfoPrinter(raw_ostream &OS) {
98 return new Printer(OS);
102 const char *Printer::getPassName() const {
103 return "Print Garbage Collector Information";
106 void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
107 FunctionPass::getAnalysisUsage(AU);
108 AU.setPreservesAll();
109 AU.addRequired<GCModuleInfo>();
112 static const char *DescKind(GC::PointKind Kind) {
114 case GC::Loop: return "loop";
115 case GC::Return: return "return";
116 case GC::PreCall: return "pre-call";
117 case GC::PostCall: return "post-call";
119 llvm_unreachable("Invalid point kind");
122 bool Printer::runOnFunction(Function &F) {
123 if (F.hasGC()) return false;
125 GCFunctionInfo *FD = &getAnalysis<GCModuleInfo>().getFunctionInfo(F);
127 OS << "GC roots for " << FD->getFunction().getName() << ":\n";
128 for (GCFunctionInfo::roots_iterator RI = FD->roots_begin(),
129 RE = FD->roots_end(); RI != RE; ++RI)
130 OS << "\t" << RI->Num << "\t" << RI->StackOffset << "[sp]\n";
132 OS << "GC safe points for " << FD->getFunction().getName() << ":\n";
133 for (GCFunctionInfo::iterator PI = FD->begin(),
134 PE = FD->end(); PI != PE; ++PI) {
136 OS << "\t" << PI->Label->getName() << ": "
137 << DescKind(PI->Kind) << ", live = {";
139 for (GCFunctionInfo::live_iterator RI = FD->live_begin(PI),
140 RE = FD->live_end(PI);;) {
141 OS << " " << RI->Num;
153 bool Printer::doFinalization(Module &M) {
154 GCModuleInfo *GMI = getAnalysisIfAvailable<GCModuleInfo>();
155 assert(GMI && "Printer didn't require GCModuleInfo?!");