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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(DIDescriptor Context, std::string &N) {
     33     if (Context.isNameSpace()) {
     34       DINameSpace NS(Context);
     35       if (!NS.getName().empty()) {
     36         getContextName(NS.getContext(), N);
     37         N = N + NS.getName().str() + "::";
     38       }
     39     } else if (Context.isType()) {
     40       DIType TY(Context);
     41       if (!TY.getName().empty()) {
     42         getContextName(TY.getContext().resolve(TypeIdentifierMap), N);
     43         N = N + TY.getName().str() + "::";
     44       }
     45     }
     46   }
     47 
     48   bool runOnModule(Module &M) override {
     49     TypeIdentifierMap.clear();
     50     NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu");
     51     if (CU_Nodes)
     52       TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
     53 
     54     StringSet<> Processed;
     55     if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.sp"))
     56       for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
     57         std::string Name;
     58         DISubprogram SP(NMD->getOperand(i));
     59         assert((!SP || SP.isSubprogram()) &&
     60                "A MDNode in llvm.dbg.sp should be null or a DISubprogram.");
     61         if (!SP)
     62           continue;
     63         getContextName(SP.getContext().resolve(TypeIdentifierMap), Name);
     64         Name = Name + SP.getDisplayName().str();
     65         if (!Name.empty() && Processed.insert(Name)) {
     66           Out << Name << "\n";
     67         }
     68       }
     69     return false;
     70   }
     71 
     72   void getAnalysisUsage(AnalysisUsage &AU) const override {
     73     AU.setPreservesAll();
     74   }
     75 };
     76 
     77 char BreakpointPrinter::ID = 0;
     78 }
     79 
     80 ModulePass *llvm::createBreakpointPrinter(raw_ostream &out) {
     81   return new BreakpointPrinter(out);
     82 }
     83