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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 
BreakpointPrinter__anon1ddf15010111::BreakpointPrinter30   BreakpointPrinter(raw_ostream &out) : ModulePass(ID), Out(out) {}
31 
getContextName__anon1ddf15010111::BreakpointPrinter32   void getContextName(DIDescriptor Context, std::string &N) {
33     if (auto *NS = dyn_cast<MDNamespace>(Context)) {
34       if (!NS->getName().empty()) {
35         getContextName(NS->getScope(), N);
36         N = N + NS->getName().str() + "::";
37       }
38     } else if (DIType TY = dyn_cast<MDType>(Context)) {
39       if (!TY->getName().empty()) {
40         getContextName(TY->getScope().resolve(TypeIdentifierMap), N);
41         N = N + TY->getName().str() + "::";
42       }
43     }
44   }
45 
runOnModule__anon1ddf15010111::BreakpointPrinter46   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<MDSubprogram>(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 
getAnalysisUsage__anon1ddf15010111::BreakpointPrinter68   void getAnalysisUsage(AnalysisUsage &AU) const override {
69     AU.setPreservesAll();
70   }
71 };
72 
73 char BreakpointPrinter::ID = 0;
74 }
75 
createBreakpointPrinter(raw_ostream & out)76 ModulePass *llvm::createBreakpointPrinter(raw_ostream &out) {
77   return new BreakpointPrinter(out);
78 }
79