1 //===-- BreakpointResolverName.cpp ------------------------------*- C++ -*-===//
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 // C Includes
11 // C++ Includes
12 // Other libraries and framework includes
13 // Project includes
14 #include "lldb/Breakpoint/BreakpointResolverName.h"
15 
16 #include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
17 #include "Plugins/Language/ObjC/ObjCLanguage.h"
18 #include "lldb/Breakpoint/BreakpointLocation.h"
19 #include "lldb/Core/Architecture.h"
20 #include "lldb/Core/Module.h"
21 #include "lldb/Symbol/Block.h"
22 #include "lldb/Symbol/Function.h"
23 #include "lldb/Symbol/Symbol.h"
24 #include "lldb/Symbol/SymbolContext.h"
25 #include "lldb/Target/Target.h"
26 #include "lldb/Utility/Log.h"
27 #include "lldb/Utility/StreamString.h"
28 
29 using namespace lldb;
30 using namespace lldb_private;
31 
32 BreakpointResolverName::BreakpointResolverName(
33     Breakpoint *bkpt, const char *name_cstr, uint32_t name_type_mask,
34     LanguageType language, Breakpoint::MatchType type, lldb::addr_t offset,
35     bool skip_prologue)
36     : BreakpointResolver(bkpt, BreakpointResolver::NameResolver, offset),
37       m_class_name(), m_regex(), m_match_type(type), m_language(language),
38       m_skip_prologue(skip_prologue) {
39   if (m_match_type == Breakpoint::Regexp) {
40     if (!m_regex.Compile(llvm::StringRef::withNullAsEmpty(name_cstr))) {
41       Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_BREAKPOINTS));
42 
43       if (log)
44         log->Warning("function name regexp: \"%s\" did not compile.",
45                      name_cstr);
46     }
47   } else {
48     AddNameLookup(ConstString(name_cstr), name_type_mask);
49   }
50 }
51 
52 BreakpointResolverName::BreakpointResolverName(
53     Breakpoint *bkpt, const char *names[], size_t num_names,
54     uint32_t name_type_mask, LanguageType language, lldb::addr_t offset,
55     bool skip_prologue)
56     : BreakpointResolver(bkpt, BreakpointResolver::NameResolver, offset),
57       m_match_type(Breakpoint::Exact), m_language(language),
58       m_skip_prologue(skip_prologue) {
59   for (size_t i = 0; i < num_names; i++) {
60     AddNameLookup(ConstString(names[i]), name_type_mask);
61   }
62 }
63 
64 BreakpointResolverName::BreakpointResolverName(
65     Breakpoint *bkpt, std::vector<std::string> names, uint32_t name_type_mask,
66     LanguageType language, lldb::addr_t offset, bool skip_prologue)
67     : BreakpointResolver(bkpt, BreakpointResolver::NameResolver, offset),
68       m_match_type(Breakpoint::Exact), m_language(language),
69       m_skip_prologue(skip_prologue) {
70   for (const std::string &name : names) {
71     AddNameLookup(ConstString(name.c_str(), name.size()), name_type_mask);
72   }
73 }
74 
75 BreakpointResolverName::BreakpointResolverName(Breakpoint *bkpt,
76                                                RegularExpression &func_regex,
77                                                lldb::LanguageType language,
78                                                lldb::addr_t offset,
79                                                bool skip_prologue)
80     : BreakpointResolver(bkpt, BreakpointResolver::NameResolver, offset),
81       m_class_name(nullptr), m_regex(func_regex),
82       m_match_type(Breakpoint::Regexp), m_language(language),
83       m_skip_prologue(skip_prologue) {}
84 
85 BreakpointResolverName::~BreakpointResolverName() = default;
86 
87 BreakpointResolverName::BreakpointResolverName(
88     const BreakpointResolverName &rhs)
89     : BreakpointResolver(rhs.m_breakpoint, BreakpointResolver::NameResolver,
90                          rhs.m_offset),
91       m_lookups(rhs.m_lookups), m_class_name(rhs.m_class_name),
92       m_regex(rhs.m_regex), m_match_type(rhs.m_match_type),
93       m_language(rhs.m_language), m_skip_prologue(rhs.m_skip_prologue) {}
94 
95 BreakpointResolver *BreakpointResolverName::CreateFromStructuredData(
96     Breakpoint *bkpt, const StructuredData::Dictionary &options_dict,
97     Status &error) {
98   LanguageType language = eLanguageTypeUnknown;
99   llvm::StringRef language_name;
100   bool success = options_dict.GetValueForKeyAsString(
101       GetKey(OptionNames::LanguageName), language_name);
102   if (success) {
103     language = Language::GetLanguageTypeFromString(language_name);
104     if (language == eLanguageTypeUnknown) {
105       error.SetErrorStringWithFormatv("BRN::CFSD: Unknown language: {0}.",
106                                       language_name);
107       return nullptr;
108     }
109   }
110 
111   lldb::addr_t offset = 0;
112   success =
113       options_dict.GetValueForKeyAsInteger(GetKey(OptionNames::Offset), offset);
114   if (!success) {
115     error.SetErrorStringWithFormat("BRN::CFSD: Missing offset entry.");
116     return nullptr;
117   }
118 
119   bool skip_prologue;
120   success = options_dict.GetValueForKeyAsBoolean(
121       GetKey(OptionNames::SkipPrologue), skip_prologue);
122   if (!success) {
123     error.SetErrorStringWithFormat("BRN::CFSD: Missing Skip prologue entry.");
124     return nullptr;
125   }
126 
127   llvm::StringRef regex_text;
128   success = options_dict.GetValueForKeyAsString(
129       GetKey(OptionNames::RegexString), regex_text);
130   if (success) {
131     RegularExpression regex(regex_text);
132     return new BreakpointResolverName(bkpt, regex, language, offset,
133                                       skip_prologue);
134   } else {
135     StructuredData::Array *names_array;
136     success = options_dict.GetValueForKeyAsArray(
137         GetKey(OptionNames::SymbolNameArray), names_array);
138     if (!success) {
139       error.SetErrorStringWithFormat("BRN::CFSD: Missing symbol names entry.");
140       return nullptr;
141     }
142     StructuredData::Array *names_mask_array;
143     success = options_dict.GetValueForKeyAsArray(
144         GetKey(OptionNames::NameMaskArray), names_mask_array);
145     if (!success) {
146       error.SetErrorStringWithFormat(
147           "BRN::CFSD: Missing symbol names mask entry.");
148       return nullptr;
149     }
150 
151     size_t num_elem = names_array->GetSize();
152     if (num_elem != names_mask_array->GetSize()) {
153       error.SetErrorString(
154           "BRN::CFSD: names and names mask arrays have different sizes.");
155       return nullptr;
156     }
157 
158     if (num_elem == 0) {
159       error.SetErrorString(
160           "BRN::CFSD: no name entry in a breakpoint by name breakpoint.");
161       return nullptr;
162     }
163     std::vector<std::string> names;
164     std::vector<uint32_t> name_masks;
165     for (size_t i = 0; i < num_elem; i++) {
166       uint32_t name_mask;
167       llvm::StringRef name;
168 
169       success = names_array->GetItemAtIndexAsString(i, name);
170       if (!success) {
171         error.SetErrorString("BRN::CFSD: name entry is not a string.");
172         return nullptr;
173       }
174       success = names_mask_array->GetItemAtIndexAsInteger(i, name_mask);
175       if (!success) {
176         error.SetErrorString("BRN::CFSD: name mask entry is not an integer.");
177         return nullptr;
178       }
179       names.push_back(name);
180       name_masks.push_back(name_mask);
181     }
182 
183     BreakpointResolverName *resolver = new BreakpointResolverName(
184         bkpt, names[0].c_str(), name_masks[0], language,
185         Breakpoint::MatchType::Exact, offset, skip_prologue);
186     for (size_t i = 1; i < num_elem; i++) {
187       resolver->AddNameLookup(ConstString(names[i]), name_masks[i]);
188     }
189     return resolver;
190   }
191 }
192 
193 StructuredData::ObjectSP BreakpointResolverName::SerializeToStructuredData() {
194   StructuredData::DictionarySP options_dict_sp(
195       new StructuredData::Dictionary());
196 
197   if (m_regex.IsValid()) {
198     options_dict_sp->AddStringItem(GetKey(OptionNames::RegexString),
199                                    m_regex.GetText());
200   } else {
201     StructuredData::ArraySP names_sp(new StructuredData::Array());
202     StructuredData::ArraySP name_masks_sp(new StructuredData::Array());
203     for (auto lookup : m_lookups) {
204       names_sp->AddItem(StructuredData::StringSP(
205           new StructuredData::String(lookup.GetName().AsCString())));
206       name_masks_sp->AddItem(StructuredData::IntegerSP(
207           new StructuredData::Integer(lookup.GetNameTypeMask())));
208     }
209     options_dict_sp->AddItem(GetKey(OptionNames::SymbolNameArray), names_sp);
210     options_dict_sp->AddItem(GetKey(OptionNames::NameMaskArray), name_masks_sp);
211   }
212   if (m_language != eLanguageTypeUnknown)
213     options_dict_sp->AddStringItem(
214         GetKey(OptionNames::LanguageName),
215         Language::GetNameForLanguageType(m_language));
216   options_dict_sp->AddBooleanItem(GetKey(OptionNames::SkipPrologue),
217                                   m_skip_prologue);
218 
219   return WrapOptionsDict(options_dict_sp);
220 }
221 
222 void BreakpointResolverName::AddNameLookup(const ConstString &name,
223                                            uint32_t name_type_mask) {
224   ObjCLanguage::MethodName objc_method(name.GetCString(), false);
225   if (objc_method.IsValid(false)) {
226     std::vector<ConstString> objc_names;
227     objc_method.GetFullNames(objc_names, true);
228     for (ConstString objc_name : objc_names) {
229       Module::LookupInfo lookup;
230       lookup.SetName(name);
231       lookup.SetLookupName(objc_name);
232       lookup.SetNameTypeMask(eFunctionNameTypeFull);
233       m_lookups.push_back(lookup);
234     }
235   } else {
236     Module::LookupInfo lookup(name, name_type_mask, m_language);
237     m_lookups.push_back(lookup);
238   }
239 }
240 
241 // FIXME: Right now we look at the module level, and call the module's
242 // "FindFunctions".
243 // Greg says he will add function tables, maybe at the CompileUnit level to
244 // accelerate function lookup.  At that point, we should switch the depth to
245 // CompileUnit, and look in these tables.
246 
247 Searcher::CallbackReturn
248 BreakpointResolverName::SearchCallback(SearchFilter &filter,
249                                        SymbolContext &context, Address *addr,
250                                        bool containing) {
251   SymbolContextList func_list;
252   // SymbolContextList sym_list;
253 
254   uint32_t i;
255   bool new_location;
256   Address break_addr;
257   assert(m_breakpoint != nullptr);
258 
259   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_BREAKPOINTS));
260 
261   if (m_class_name) {
262     if (log)
263       log->Warning("Class/method function specification not supported yet.\n");
264     return Searcher::eCallbackReturnStop;
265   }
266   bool filter_by_cu =
267       (filter.GetFilterRequiredItems() & eSymbolContextCompUnit) != 0;
268   bool filter_by_language = (m_language != eLanguageTypeUnknown);
269   const bool include_symbols = !filter_by_cu;
270   const bool include_inlines = true;
271   const bool append = true;
272 
273   switch (m_match_type) {
274   case Breakpoint::Exact:
275     if (context.module_sp) {
276       for (const auto &lookup : m_lookups) {
277         const size_t start_func_idx = func_list.GetSize();
278         context.module_sp->FindFunctions(
279             lookup.GetLookupName(), nullptr, lookup.GetNameTypeMask(),
280             include_symbols, include_inlines, append, func_list);
281 
282         const size_t end_func_idx = func_list.GetSize();
283 
284         if (start_func_idx < end_func_idx)
285           lookup.Prune(func_list, start_func_idx);
286       }
287     }
288     break;
289   case Breakpoint::Regexp:
290     if (context.module_sp) {
291       context.module_sp->FindFunctions(
292           m_regex,
293           !filter_by_cu, // include symbols only if we aren't filtering by CU
294           include_inlines, append, func_list);
295     }
296     break;
297   case Breakpoint::Glob:
298     if (log)
299       log->Warning("glob is not supported yet.");
300     break;
301   }
302 
303   // If the filter specifies a Compilation Unit, remove the ones that don't
304   // pass at this point.
305   if (filter_by_cu || filter_by_language) {
306     uint32_t num_functions = func_list.GetSize();
307 
308     for (size_t idx = 0; idx < num_functions; idx++) {
309       bool remove_it = false;
310       SymbolContext sc;
311       func_list.GetContextAtIndex(idx, sc);
312       if (filter_by_cu) {
313         if (!sc.comp_unit || !filter.CompUnitPasses(*sc.comp_unit))
314           remove_it = true;
315       }
316 
317       if (filter_by_language) {
318         LanguageType sym_language = sc.GetLanguage();
319         if ((Language::GetPrimaryLanguage(sym_language) !=
320              Language::GetPrimaryLanguage(m_language)) &&
321             (sym_language != eLanguageTypeUnknown)) {
322           remove_it = true;
323         }
324       }
325 
326       if (remove_it) {
327         func_list.RemoveContextAtIndex(idx);
328         num_functions--;
329         idx--;
330       }
331     }
332   }
333 
334   // Remove any duplicates between the function list and the symbol list
335   SymbolContext sc;
336   if (func_list.GetSize()) {
337     for (i = 0; i < func_list.GetSize(); i++) {
338       if (func_list.GetContextAtIndex(i, sc)) {
339         bool is_reexported = false;
340 
341         if (sc.block && sc.block->GetInlinedFunctionInfo()) {
342           if (!sc.block->GetStartAddress(break_addr))
343             break_addr.Clear();
344         } else if (sc.function) {
345           break_addr = sc.function->GetAddressRange().GetBaseAddress();
346           if (m_skip_prologue && break_addr.IsValid()) {
347             const uint32_t prologue_byte_size =
348                 sc.function->GetPrologueByteSize();
349             if (prologue_byte_size)
350               break_addr.SetOffset(break_addr.GetOffset() + prologue_byte_size);
351           }
352         } else if (sc.symbol) {
353           if (sc.symbol->GetType() == eSymbolTypeReExported) {
354             const Symbol *actual_symbol =
355                 sc.symbol->ResolveReExportedSymbol(m_breakpoint->GetTarget());
356             if (actual_symbol) {
357               is_reexported = true;
358               break_addr = actual_symbol->GetAddress();
359             }
360           } else {
361             break_addr = sc.symbol->GetAddress();
362           }
363 
364           if (m_skip_prologue && break_addr.IsValid()) {
365             const uint32_t prologue_byte_size =
366                 sc.symbol->GetPrologueByteSize();
367             if (prologue_byte_size)
368               break_addr.SetOffset(break_addr.GetOffset() + prologue_byte_size);
369             else {
370               const Architecture *arch =
371                   m_breakpoint->GetTarget().GetArchitecturePlugin();
372               if (arch)
373                 arch->AdjustBreakpointAddress(*sc.symbol, break_addr);
374             }
375           }
376         }
377 
378         if (break_addr.IsValid()) {
379           if (filter.AddressPasses(break_addr)) {
380             BreakpointLocationSP bp_loc_sp(
381                 AddLocation(break_addr, &new_location));
382             bp_loc_sp->SetIsReExported(is_reexported);
383             if (bp_loc_sp && new_location && !m_breakpoint->IsInternal()) {
384               if (log) {
385                 StreamString s;
386                 bp_loc_sp->GetDescription(&s, lldb::eDescriptionLevelVerbose);
387                 log->Printf("Added location: %s\n", s.GetData());
388               }
389             }
390           }
391         }
392       }
393     }
394   }
395 
396   return Searcher::eCallbackReturnContinue;
397 }
398 
399 lldb::SearchDepth BreakpointResolverName::GetDepth() {
400   return lldb::eSearchDepthModule;
401 }
402 
403 void BreakpointResolverName::GetDescription(Stream *s) {
404   if (m_match_type == Breakpoint::Regexp)
405     s->Printf("regex = '%s'", m_regex.GetText().str().c_str());
406   else {
407     size_t num_names = m_lookups.size();
408     if (num_names == 1)
409       s->Printf("name = '%s'", m_lookups[0].GetName().GetCString());
410     else {
411       s->Printf("names = {");
412       for (size_t i = 0; i < num_names; i++) {
413         s->Printf("%s'%s'", (i == 0 ? "" : ", "),
414                   m_lookups[i].GetName().GetCString());
415       }
416       s->Printf("}");
417     }
418   }
419   if (m_language != eLanguageTypeUnknown) {
420     s->Printf(", language = %s", Language::GetNameForLanguageType(m_language));
421   }
422 }
423 
424 void BreakpointResolverName::Dump(Stream *s) const {}
425 
426 lldb::BreakpointResolverSP
427 BreakpointResolverName::CopyForBreakpoint(Breakpoint &breakpoint) {
428   lldb::BreakpointResolverSP ret_sp(new BreakpointResolverName(*this));
429   ret_sp->SetBreakpoint(&breakpoint);
430   return ret_sp;
431 }
432