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     TypeIdentifierMap = generateDITypeIdentifierMap(M);
49 
50     StringSet<> Processed;
51     if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.sp"))
52       for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
53         std::string Name;
54         auto *SP = cast_or_null<DISubprogram>(NMD->getOperand(i));
55         if (!SP)
56           continue;
57         getContextName(SP->getScope().resolve(TypeIdentifierMap), Name);
58         Name = Name + SP->getDisplayName().str();
59         if (!Name.empty() && Processed.insert(Name).second) {
60           Out << Name << "\n";
61         }
62       }
63     return false;
64   }
65 
66   void getAnalysisUsage(AnalysisUsage &AU) const override {
67     AU.setPreservesAll();
68   }
69 };
70 
71 char BreakpointPrinter::ID = 0;
72 }
73 
74 ModulePass *llvm::createBreakpointPrinter(raw_ostream &out) {
75   return new BreakpointPrinter(out);
76 }
77