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      1 //===- BreakpointPrinter.cpp - Breakpoint location printer ----------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 ///
     10 /// \file
     11 /// \brief Breakpoint location printer.
     12 ///
     13 //===----------------------------------------------------------------------===//
     14 #include "BreakpointPrinter.h"
     15 #include "llvm/ADT/StringSet.h"
     16 #include "llvm/IR/DebugInfo.h"
     17 #include "llvm/IR/Module.h"
     18 #include "llvm/Pass.h"
     19 #include "llvm/Support/raw_ostream.h"
     20 
     21 using namespace llvm;
     22 
     23 namespace {
     24 
     25 struct BreakpointPrinter : public ModulePass {
     26   raw_ostream &Out;
     27   static char ID;
     28   DITypeIdentifierMap TypeIdentifierMap;
     29 
     30   BreakpointPrinter(raw_ostream &out) : ModulePass(ID), Out(out) {}
     31 
     32   void getContextName(const DIScope *Context, std::string &N) {
     33     if (auto *NS = dyn_cast<DINamespace>(Context)) {
     34       if (!NS->getName().empty()) {
     35         getContextName(NS->getScope(), N);
     36         N = N + NS->getName().str() + "::";
     37       }
     38     } else if (auto *TY = dyn_cast<DIType>(Context)) {
     39       if (!TY->getName().empty()) {
     40         getContextName(TY->getScope().resolve(TypeIdentifierMap), N);
     41         N = N + TY->getName().str() + "::";
     42       }
     43     }
     44   }
     45 
     46   bool runOnModule(Module &M) override {
     47     TypeIdentifierMap.clear();
     48     NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu");
     49     if (CU_Nodes)
     50       TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
     51 
     52     StringSet<> Processed;
     53     if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.sp"))
     54       for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
     55         std::string Name;
     56         auto *SP = cast_or_null<DISubprogram>(NMD->getOperand(i));
     57         if (!SP)
     58           continue;
     59         getContextName(SP->getScope().resolve(TypeIdentifierMap), Name);
     60         Name = Name + SP->getDisplayName().str();
     61         if (!Name.empty() && Processed.insert(Name).second) {
     62           Out << Name << "\n";
     63         }
     64       }
     65     return false;
     66   }
     67 
     68   void getAnalysisUsage(AnalysisUsage &AU) const override {
     69     AU.setPreservesAll();
     70   }
     71 };
     72 
     73 char BreakpointPrinter::ID = 0;
     74 }
     75 
     76 ModulePass *llvm::createBreakpointPrinter(raw_ostream &out) {
     77   return new BreakpointPrinter(out);
     78 }
     79