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1 //===-- llvm-dwarfdump.cpp - Debug info dumping utility for llvm -----------===//
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 // This program is a utility that works like "dwarfdump".
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/ADT/OwningPtr.h"
15 #include "llvm/ADT/Triple.h"
16 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/Object/ObjectFile.h"
18 #include "llvm/DebugInfo/DIContext.h"
19 #include "llvm/Support/CommandLine.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/Format.h"
22 #include "llvm/Support/ManagedStatic.h"
23 #include "llvm/Support/MemoryBuffer.h"
24 #include "llvm/Support/MemoryObject.h"
25 #include "llvm/Support/PrettyStackTrace.h"
26 #include "llvm/Support/Signals.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/Support/system_error.h"
29 #include <algorithm>
30 #include <cstring>
31 using namespace llvm;
32 using namespace object;
33 
34 static cl::list<std::string>
35 InputFilenames(cl::Positional, cl::desc("<input object files>"),
36                cl::ZeroOrMore);
37 
38 static cl::opt<unsigned long long>
39 Address("address", cl::init(-1ULL),
40         cl::desc("Print line information for a given address"));
41 
DumpInput(const StringRef & Filename)42 static void DumpInput(const StringRef &Filename) {
43   OwningPtr<MemoryBuffer> Buff;
44 
45   if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
46     errs() << Filename << ": " << ec.message() << "\n";
47     return;
48   }
49 
50   OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
51 
52   StringRef DebugInfoSection;
53   StringRef DebugAbbrevSection;
54   StringRef DebugLineSection;
55   StringRef DebugArangesSection;
56   StringRef DebugStringSection;
57 
58   error_code ec;
59   for (section_iterator i = Obj->begin_sections(),
60                         e = Obj->end_sections();
61                         i != e; i.increment(ec)) {
62     StringRef name;
63     i->getName(name);
64     StringRef data;
65     i->getContents(data);
66 
67     if (name.startswith("__DWARF,"))
68       name = name.substr(8); // Skip "__DWARF," prefix.
69     name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
70     if (name == "debug_info")
71       DebugInfoSection = data;
72     else if (name == "debug_abbrev")
73       DebugAbbrevSection = data;
74     else if (name == "debug_line")
75       DebugLineSection = data;
76     else if (name == "debug_aranges")
77       DebugArangesSection = data;
78     else if (name == "debug_str")
79       DebugStringSection = data;
80   }
81 
82   OwningPtr<DIContext> dictx(DIContext::getDWARFContext(/*FIXME*/true,
83                                                         DebugInfoSection,
84                                                         DebugAbbrevSection,
85                                                         DebugArangesSection,
86                                                         DebugLineSection,
87                                                         DebugStringSection));
88   if (Address == -1ULL) {
89     outs() << Filename
90            << ":\tfile format " << Obj->getFileFormatName() << "\n\n";
91     // Dump the complete DWARF structure.
92     dictx->dump(outs());
93   } else {
94     // Print line info for the specified address.
95     DILineInfo dli = dictx->getLineInfoForAddress(Address);
96     outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
97            << dli.getLine() << ':' << dli.getColumn() << '\n';
98   }
99 }
100 
main(int argc,char ** argv)101 int main(int argc, char **argv) {
102   // Print a stack trace if we signal out.
103   sys::PrintStackTraceOnErrorSignal();
104   PrettyStackTraceProgram X(argc, argv);
105   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
106 
107   cl::ParseCommandLineOptions(argc, argv, "llvm dwarf dumper\n");
108 
109   // Defaults to a.out if no filenames specified.
110   if (InputFilenames.size() == 0)
111     InputFilenames.push_back("a.out");
112 
113   std::for_each(InputFilenames.begin(), InputFilenames.end(), DumpInput);
114 
115   return 0;
116 }
117