1 //===-- Language.cpp ------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include <functional>
10 #include <map>
11 #include <mutex>
12 
13 #include "lldb/Target/Language.h"
14 
15 #include "lldb/Core/PluginManager.h"
16 #include "lldb/Symbol/SymbolFile.h"
17 #include "lldb/Symbol/TypeList.h"
18 #include "lldb/Target/Target.h"
19 #include "lldb/Utility/Stream.h"
20 
21 #include "llvm/Support/Threading.h"
22 
23 using namespace lldb;
24 using namespace lldb_private;
25 using namespace lldb_private::formatters;
26 
27 typedef std::unique_ptr<Language> LanguageUP;
28 typedef std::map<lldb::LanguageType, LanguageUP> LanguagesMap;
29 
GetLanguagesMap()30 static LanguagesMap &GetLanguagesMap() {
31   static LanguagesMap *g_map = nullptr;
32   static llvm::once_flag g_initialize;
33 
34   llvm::call_once(g_initialize, [] {
35     g_map = new LanguagesMap(); // NOTE: INTENTIONAL LEAK due to global
36                                 // destructor chain
37   });
38 
39   return *g_map;
40 }
GetLanguagesMutex()41 static std::mutex &GetLanguagesMutex() {
42   static std::mutex *g_mutex = nullptr;
43   static llvm::once_flag g_initialize;
44 
45   llvm::call_once(g_initialize, [] {
46     g_mutex = new std::mutex(); // NOTE: INTENTIONAL LEAK due to global
47                                 // destructor chain
48   });
49 
50   return *g_mutex;
51 }
52 
FindPlugin(lldb::LanguageType language)53 Language *Language::FindPlugin(lldb::LanguageType language) {
54   std::lock_guard<std::mutex> guard(GetLanguagesMutex());
55   LanguagesMap &map(GetLanguagesMap());
56   auto iter = map.find(language), end = map.end();
57   if (iter != end)
58     return iter->second.get();
59 
60   Language *language_ptr = nullptr;
61   LanguageCreateInstance create_callback;
62 
63   for (uint32_t idx = 0;
64        (create_callback =
65             PluginManager::GetLanguageCreateCallbackAtIndex(idx)) != nullptr;
66        ++idx) {
67     language_ptr = create_callback(language);
68 
69     if (language_ptr) {
70       map[language] = std::unique_ptr<Language>(language_ptr);
71       return language_ptr;
72     }
73   }
74 
75   return nullptr;
76 }
77 
FindPlugin(llvm::StringRef file_path)78 Language *Language::FindPlugin(llvm::StringRef file_path) {
79   Language *result = nullptr;
80   ForEach([&result, file_path](Language *language) {
81     if (language->IsSourceFile(file_path)) {
82       result = language;
83       return false;
84     }
85     return true;
86   });
87   return result;
88 }
89 
FindPlugin(LanguageType language,llvm::StringRef file_path)90 Language *Language::FindPlugin(LanguageType language,
91                                llvm::StringRef file_path) {
92   Language *result = FindPlugin(language);
93   // Finding a language by file path is slower, we so we use this as the
94   // fallback.
95   if (!result)
96     result = FindPlugin(file_path);
97   return result;
98 }
99 
ForEach(std::function<bool (Language *)> callback)100 void Language::ForEach(std::function<bool(Language *)> callback) {
101   // If we want to iterate over all languages, we first have to complete the
102   // LanguagesMap.
103   static llvm::once_flag g_initialize;
104   llvm::call_once(g_initialize, [] {
105     for (unsigned lang = eLanguageTypeUnknown; lang < eNumLanguageTypes;
106          ++lang) {
107       FindPlugin(static_cast<lldb::LanguageType>(lang));
108     }
109   });
110 
111   std::lock_guard<std::mutex> guard(GetLanguagesMutex());
112   LanguagesMap &map(GetLanguagesMap());
113   for (const auto &entry : map) {
114     if (!callback(entry.second.get()))
115       break;
116   }
117 }
118 
IsTopLevelFunction(Function & function)119 bool Language::IsTopLevelFunction(Function &function) { return false; }
120 
GetFormatters()121 lldb::TypeCategoryImplSP Language::GetFormatters() { return nullptr; }
122 
GetHardcodedFormats()123 HardcodedFormatters::HardcodedFormatFinder Language::GetHardcodedFormats() {
124   return {};
125 }
126 
GetHardcodedSummaries()127 HardcodedFormatters::HardcodedSummaryFinder Language::GetHardcodedSummaries() {
128   return {};
129 }
130 
131 HardcodedFormatters::HardcodedSyntheticFinder
GetHardcodedSynthetics()132 Language::GetHardcodedSynthetics() {
133   return {};
134 }
135 
136 std::vector<ConstString>
GetPossibleFormattersMatches(ValueObject & valobj,lldb::DynamicValueType use_dynamic)137 Language::GetPossibleFormattersMatches(ValueObject &valobj,
138                                        lldb::DynamicValueType use_dynamic) {
139   return {};
140 }
141 
142 struct language_name_pair {
143   const char *name;
144   LanguageType type;
145 };
146 
147 struct language_name_pair language_names[] = {
148     // To allow GetNameForLanguageType to be a simple array lookup, the first
149     // part of this array must follow enum LanguageType exactly.
150     {"unknown", eLanguageTypeUnknown},
151     {"c89", eLanguageTypeC89},
152     {"c", eLanguageTypeC},
153     {"ada83", eLanguageTypeAda83},
154     {"c++", eLanguageTypeC_plus_plus},
155     {"cobol74", eLanguageTypeCobol74},
156     {"cobol85", eLanguageTypeCobol85},
157     {"fortran77", eLanguageTypeFortran77},
158     {"fortran90", eLanguageTypeFortran90},
159     {"pascal83", eLanguageTypePascal83},
160     {"modula2", eLanguageTypeModula2},
161     {"java", eLanguageTypeJava},
162     {"c99", eLanguageTypeC99},
163     {"ada95", eLanguageTypeAda95},
164     {"fortran95", eLanguageTypeFortran95},
165     {"pli", eLanguageTypePLI},
166     {"objective-c", eLanguageTypeObjC},
167     {"objective-c++", eLanguageTypeObjC_plus_plus},
168     {"upc", eLanguageTypeUPC},
169     {"d", eLanguageTypeD},
170     {"python", eLanguageTypePython},
171     {"opencl", eLanguageTypeOpenCL},
172     {"go", eLanguageTypeGo},
173     {"modula3", eLanguageTypeModula3},
174     {"haskell", eLanguageTypeHaskell},
175     {"c++03", eLanguageTypeC_plus_plus_03},
176     {"c++11", eLanguageTypeC_plus_plus_11},
177     {"ocaml", eLanguageTypeOCaml},
178     {"rust", eLanguageTypeRust},
179     {"c11", eLanguageTypeC11},
180     {"swift", eLanguageTypeSwift},
181     {"julia", eLanguageTypeJulia},
182     {"dylan", eLanguageTypeDylan},
183     {"c++14", eLanguageTypeC_plus_plus_14},
184     {"fortran03", eLanguageTypeFortran03},
185     {"fortran08", eLanguageTypeFortran08},
186     // Vendor Extensions
187     {"mipsassem", eLanguageTypeMipsAssembler},
188     {"renderscript", eLanguageTypeExtRenderScript},
189     // Now synonyms, in arbitrary order
190     {"objc", eLanguageTypeObjC},
191     {"objc++", eLanguageTypeObjC_plus_plus},
192     {"pascal", eLanguageTypePascal83}};
193 
194 static uint32_t num_languages =
195     sizeof(language_names) / sizeof(struct language_name_pair);
196 
GetLanguageTypeFromString(llvm::StringRef string)197 LanguageType Language::GetLanguageTypeFromString(llvm::StringRef string) {
198   for (const auto &L : language_names) {
199     if (string.equals_lower(L.name))
200       return static_cast<LanguageType>(L.type);
201   }
202 
203   return eLanguageTypeUnknown;
204 }
205 
GetNameForLanguageType(LanguageType language)206 const char *Language::GetNameForLanguageType(LanguageType language) {
207   if (language < num_languages)
208     return language_names[language].name;
209   else
210     return language_names[eLanguageTypeUnknown].name;
211 }
212 
PrintAllLanguages(Stream & s,const char * prefix,const char * suffix)213 void Language::PrintAllLanguages(Stream &s, const char *prefix,
214                                  const char *suffix) {
215   for (uint32_t i = 1; i < num_languages; i++) {
216     s.Printf("%s%s%s", prefix, language_names[i].name, suffix);
217   }
218 }
219 
ForAllLanguages(std::function<bool (lldb::LanguageType)> callback)220 void Language::ForAllLanguages(
221     std::function<bool(lldb::LanguageType)> callback) {
222   for (uint32_t i = 1; i < num_languages; i++) {
223     if (!callback(language_names[i].type))
224       break;
225   }
226 }
227 
LanguageIsCPlusPlus(LanguageType language)228 bool Language::LanguageIsCPlusPlus(LanguageType language) {
229   switch (language) {
230   case eLanguageTypeC_plus_plus:
231   case eLanguageTypeC_plus_plus_03:
232   case eLanguageTypeC_plus_plus_11:
233   case eLanguageTypeC_plus_plus_14:
234   case eLanguageTypeObjC_plus_plus:
235     return true;
236   default:
237     return false;
238   }
239 }
240 
LanguageIsObjC(LanguageType language)241 bool Language::LanguageIsObjC(LanguageType language) {
242   switch (language) {
243   case eLanguageTypeObjC:
244   case eLanguageTypeObjC_plus_plus:
245     return true;
246   default:
247     return false;
248   }
249 }
250 
LanguageIsC(LanguageType language)251 bool Language::LanguageIsC(LanguageType language) {
252   switch (language) {
253   case eLanguageTypeC:
254   case eLanguageTypeC89:
255   case eLanguageTypeC99:
256   case eLanguageTypeC11:
257     return true;
258   default:
259     return false;
260   }
261 }
262 
LanguageIsCFamily(LanguageType language)263 bool Language::LanguageIsCFamily(LanguageType language) {
264   switch (language) {
265   case eLanguageTypeC:
266   case eLanguageTypeC89:
267   case eLanguageTypeC99:
268   case eLanguageTypeC11:
269   case eLanguageTypeC_plus_plus:
270   case eLanguageTypeC_plus_plus_03:
271   case eLanguageTypeC_plus_plus_11:
272   case eLanguageTypeC_plus_plus_14:
273   case eLanguageTypeObjC_plus_plus:
274   case eLanguageTypeObjC:
275     return true;
276   default:
277     return false;
278   }
279 }
280 
LanguageIsPascal(LanguageType language)281 bool Language::LanguageIsPascal(LanguageType language) {
282   switch (language) {
283   case eLanguageTypePascal83:
284     return true;
285   default:
286     return false;
287   }
288 }
289 
GetPrimaryLanguage(LanguageType language)290 LanguageType Language::GetPrimaryLanguage(LanguageType language) {
291   switch (language) {
292   case eLanguageTypeC_plus_plus:
293   case eLanguageTypeC_plus_plus_03:
294   case eLanguageTypeC_plus_plus_11:
295   case eLanguageTypeC_plus_plus_14:
296     return eLanguageTypeC_plus_plus;
297   case eLanguageTypeC:
298   case eLanguageTypeC89:
299   case eLanguageTypeC99:
300   case eLanguageTypeC11:
301     return eLanguageTypeC;
302   case eLanguageTypeObjC:
303   case eLanguageTypeObjC_plus_plus:
304     return eLanguageTypeObjC;
305   case eLanguageTypePascal83:
306   case eLanguageTypeCobol74:
307   case eLanguageTypeCobol85:
308   case eLanguageTypeFortran77:
309   case eLanguageTypeFortran90:
310   case eLanguageTypeFortran95:
311   case eLanguageTypeFortran03:
312   case eLanguageTypeFortran08:
313   case eLanguageTypeAda83:
314   case eLanguageTypeAda95:
315   case eLanguageTypeModula2:
316   case eLanguageTypeJava:
317   case eLanguageTypePLI:
318   case eLanguageTypeUPC:
319   case eLanguageTypeD:
320   case eLanguageTypePython:
321   case eLanguageTypeOpenCL:
322   case eLanguageTypeGo:
323   case eLanguageTypeModula3:
324   case eLanguageTypeHaskell:
325   case eLanguageTypeOCaml:
326   case eLanguageTypeRust:
327   case eLanguageTypeSwift:
328   case eLanguageTypeJulia:
329   case eLanguageTypeDylan:
330   case eLanguageTypeMipsAssembler:
331   case eLanguageTypeExtRenderScript:
332   case eLanguageTypeUnknown:
333   default:
334     return language;
335   }
336 }
337 
GetSupportedLanguages()338 std::set<lldb::LanguageType> Language::GetSupportedLanguages() {
339   std::set<lldb::LanguageType> supported_languages;
340   ForEach([&](Language *lang) {
341     supported_languages.emplace(lang->GetLanguageType());
342     return true;
343   });
344   return supported_languages;
345 }
346 
GetLanguagesSupportingTypeSystems()347 LanguageSet Language::GetLanguagesSupportingTypeSystems() {
348   return PluginManager::GetAllTypeSystemSupportedLanguagesForTypes();
349 }
350 
GetLanguagesSupportingTypeSystemsForExpressions()351 LanguageSet Language::GetLanguagesSupportingTypeSystemsForExpressions() {
352   return PluginManager::GetAllTypeSystemSupportedLanguagesForExpressions();
353 }
354 
GetLanguagesSupportingREPLs()355 LanguageSet Language::GetLanguagesSupportingREPLs() {
356   return PluginManager::GetREPLAllTypeSystemSupportedLanguages();
357 }
358 
GetTypeScavenger()359 std::unique_ptr<Language::TypeScavenger> Language::GetTypeScavenger() {
360   return nullptr;
361 }
362 
GetLanguageSpecificTypeLookupHelp()363 const char *Language::GetLanguageSpecificTypeLookupHelp() { return nullptr; }
364 
Find(ExecutionContextScope * exe_scope,const char * key,ResultSet & results,bool append)365 size_t Language::TypeScavenger::Find(ExecutionContextScope *exe_scope,
366                                      const char *key, ResultSet &results,
367                                      bool append) {
368   if (!exe_scope || !exe_scope->CalculateTarget().get())
369     return false;
370 
371   if (!key || !key[0])
372     return false;
373 
374   if (!append)
375     results.clear();
376 
377   size_t old_size = results.size();
378 
379   if (this->Find_Impl(exe_scope, key, results))
380     return results.size() - old_size;
381   return 0;
382 }
383 
Find_Impl(ExecutionContextScope * exe_scope,const char * key,ResultSet & results)384 bool Language::ImageListTypeScavenger::Find_Impl(
385     ExecutionContextScope *exe_scope, const char *key, ResultSet &results) {
386   bool result = false;
387 
388   Target *target = exe_scope->CalculateTarget().get();
389   if (target) {
390     const auto &images(target->GetImages());
391     ConstString cs_key(key);
392     llvm::DenseSet<SymbolFile *> searched_sym_files;
393     TypeList matches;
394     images.FindTypes(nullptr, cs_key, false, UINT32_MAX, searched_sym_files,
395                      matches);
396     for (const auto &match : matches.Types()) {
397       if (match) {
398         CompilerType compiler_type(match->GetFullCompilerType());
399         compiler_type = AdjustForInclusion(compiler_type);
400         if (!compiler_type)
401           continue;
402         std::unique_ptr<Language::TypeScavenger::Result> scavengeresult(
403             new Result(compiler_type));
404         results.insert(std::move(scavengeresult));
405         result = true;
406       }
407     }
408   }
409 
410   return result;
411 }
412 
GetFormatterPrefixSuffix(ValueObject & valobj,ConstString type_hint,std::string & prefix,std::string & suffix)413 bool Language::GetFormatterPrefixSuffix(ValueObject &valobj,
414                                         ConstString type_hint,
415                                         std::string &prefix,
416                                         std::string &suffix) {
417   return false;
418 }
419 
GetDeclPrintingHelper()420 DumpValueObjectOptions::DeclPrintingHelper Language::GetDeclPrintingHelper() {
421   return nullptr;
422 }
423 
IsLogicalTrue(ValueObject & valobj,Status & error)424 LazyBool Language::IsLogicalTrue(ValueObject &valobj, Status &error) {
425   return eLazyBoolCalculate;
426 }
427 
IsNilReference(ValueObject & valobj)428 bool Language::IsNilReference(ValueObject &valobj) { return false; }
429 
IsUninitializedReference(ValueObject & valobj)430 bool Language::IsUninitializedReference(ValueObject &valobj) { return false; }
431 
GetFunctionDisplayName(const SymbolContext * sc,const ExecutionContext * exe_ctx,FunctionNameRepresentation representation,Stream & s)432 bool Language::GetFunctionDisplayName(const SymbolContext *sc,
433                                       const ExecutionContext *exe_ctx,
434                                       FunctionNameRepresentation representation,
435                                       Stream &s) {
436   return false;
437 }
438 
GetExceptionResolverDescription(bool catch_on,bool throw_on,Stream & s)439 void Language::GetExceptionResolverDescription(bool catch_on, bool throw_on,
440                                                Stream &s) {
441   GetDefaultExceptionResolverDescription(catch_on, throw_on, s);
442 }
443 
GetDefaultExceptionResolverDescription(bool catch_on,bool throw_on,Stream & s)444 void Language::GetDefaultExceptionResolverDescription(bool catch_on,
445                                                       bool throw_on,
446                                                       Stream &s) {
447   s.Printf("Exception breakpoint (catch: %s throw: %s)",
448            catch_on ? "on" : "off", throw_on ? "on" : "off");
449 }
450 // Constructor
Language()451 Language::Language() {}
452 
453 // Destructor
~Language()454 Language::~Language() {}
455