xref: /llvm-project/lldb/source/Target/StackFrameRecognizer.cpp (revision d8d252fe96877f9fdbf6b0b6c19da543e796bb84)
1 //===-- StackFrameRecognizer.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 "lldb/Target/StackFrameRecognizer.h"
10 #include "lldb/Core/Module.h"
11 #include "lldb/Interpreter/ScriptInterpreter.h"
12 #include "lldb/Symbol/Symbol.h"
13 #include "lldb/Target/StackFrame.h"
14 #include "lldb/Utility/RegularExpression.h"
15 
16 using namespace lldb;
17 using namespace lldb_private;
18 
19 class ScriptedRecognizedStackFrame : public RecognizedStackFrame {
20   bool m_hidden;
21 
22 public:
23   ScriptedRecognizedStackFrame(ValueObjectListSP args, bool hidden)
24       : m_hidden(hidden) {
25     m_arguments = std::move(args);
26   }
27   bool ShouldHide() override { return m_hidden; }
28 };
29 
30 ScriptedStackFrameRecognizer::ScriptedStackFrameRecognizer(
31     ScriptInterpreter *interpreter, const char *pclass)
32     : m_interpreter(interpreter), m_python_class(pclass) {
33   m_python_object_sp =
34       m_interpreter->CreateFrameRecognizer(m_python_class.c_str());
35 }
36 
37 RecognizedStackFrameSP
38 ScriptedStackFrameRecognizer::RecognizeFrame(lldb::StackFrameSP frame) {
39   if (!m_python_object_sp || !m_interpreter)
40     return RecognizedStackFrameSP();
41 
42   ValueObjectListSP args =
43       m_interpreter->GetRecognizedArguments(m_python_object_sp, frame);
44   auto args_synthesized = ValueObjectListSP(new ValueObjectList());
45   if (args) {
46     for (const auto &o : args->GetObjects())
47       args_synthesized->Append(ValueObjectRecognizerSynthesizedValue::Create(
48           *o, eValueTypeVariableArgument));
49   }
50 
51   bool hidden = m_interpreter->ShouldHide(m_python_object_sp, frame);
52 
53   return RecognizedStackFrameSP(
54       new ScriptedRecognizedStackFrame(args_synthesized, hidden));
55 }
56 
57 void StackFrameRecognizerManager::BumpGeneration() {
58   uint32_t n = m_generation;
59   n = (n + 1) & ((1 << 16) - 1);
60   m_generation = n;
61 }
62 
63 void StackFrameRecognizerManager::AddRecognizer(
64     StackFrameRecognizerSP recognizer, ConstString module,
65     llvm::ArrayRef<ConstString> symbols,
66     Mangled::NamePreference symbol_mangling, bool first_instruction_only) {
67   m_recognizers.push_front({(uint32_t)m_recognizers.size(), recognizer, false,
68                             module, RegularExpressionSP(), symbols,
69                             RegularExpressionSP(), symbol_mangling,
70                             first_instruction_only, true});
71   BumpGeneration();
72 }
73 
74 void StackFrameRecognizerManager::AddRecognizer(
75     StackFrameRecognizerSP recognizer, RegularExpressionSP module,
76     RegularExpressionSP symbol, Mangled::NamePreference symbol_mangling,
77     bool first_instruction_only) {
78   m_recognizers.push_front({(uint32_t)m_recognizers.size(), recognizer, true,
79                             ConstString(), module, std::vector<ConstString>(),
80                             symbol, symbol_mangling, first_instruction_only,
81                             true});
82   BumpGeneration();
83 }
84 
85 void StackFrameRecognizerManager::ForEach(
86     const std::function<void(
87         uint32_t, bool, std::string, std::string, llvm::ArrayRef<ConstString>,
88         Mangled::NamePreference name_preference, bool)> &callback) {
89   for (auto entry : m_recognizers) {
90     if (entry.is_regexp) {
91       std::string module_name;
92       std::string symbol_name;
93 
94       if (entry.module_regexp)
95         module_name = entry.module_regexp->GetText().str();
96       if (entry.symbol_regexp)
97         symbol_name = entry.symbol_regexp->GetText().str();
98 
99       callback(entry.recognizer_id, entry.enabled, entry.recognizer->GetName(),
100                module_name, llvm::ArrayRef(ConstString(symbol_name)),
101                entry.symbol_mangling, true);
102     } else {
103       callback(entry.recognizer_id, entry.enabled, entry.recognizer->GetName(),
104                entry.module.GetCString(), entry.symbols, entry.symbol_mangling,
105                false);
106     }
107   }
108 }
109 
110 bool StackFrameRecognizerManager::SetEnabledForID(uint32_t recognizer_id,
111                                                   bool enabled) {
112   auto found =
113       llvm::find_if(m_recognizers, [recognizer_id](const RegisteredEntry &e) {
114         return e.recognizer_id == recognizer_id;
115       });
116   if (found == m_recognizers.end())
117     return false;
118   found->enabled = enabled;
119   BumpGeneration();
120   return true;
121 }
122 
123 bool StackFrameRecognizerManager::RemoveRecognizerWithID(
124     uint32_t recognizer_id) {
125   auto found =
126       llvm::find_if(m_recognizers, [recognizer_id](const RegisteredEntry &e) {
127         return e.recognizer_id == recognizer_id;
128       });
129   if (found == m_recognizers.end())
130     return false;
131   m_recognizers.erase(found);
132   BumpGeneration();
133   return true;
134 }
135 
136 void StackFrameRecognizerManager::RemoveAllRecognizers() {
137   BumpGeneration();
138   m_recognizers.clear();
139 }
140 
141 StackFrameRecognizerSP
142 StackFrameRecognizerManager::GetRecognizerForFrame(StackFrameSP frame) {
143   const SymbolContext &symctx = frame->GetSymbolContext(
144       eSymbolContextModule | eSymbolContextFunction | eSymbolContextSymbol);
145   ModuleSP module_sp = symctx.module_sp;
146   if (!module_sp)
147     return StackFrameRecognizerSP();
148   ConstString module_name = module_sp->GetFileSpec().GetFilename();
149   Symbol *symbol = symctx.symbol;
150   if (!symbol)
151     return StackFrameRecognizerSP();
152   Address start_addr = symbol->GetAddress();
153   Address current_addr = frame->GetFrameCodeAddress();
154 
155   for (auto entry : m_recognizers) {
156     if (!entry.enabled)
157       continue;
158 
159     if (entry.module)
160       if (entry.module != module_name)
161         continue;
162 
163     if (entry.module_regexp)
164       if (!entry.module_regexp->Execute(module_name.GetStringRef()))
165         continue;
166 
167     ConstString function_name = symctx.GetFunctionName(entry.symbol_mangling);
168 
169     if (!entry.symbols.empty())
170       if (!llvm::is_contained(entry.symbols, function_name))
171         continue;
172 
173     if (entry.symbol_regexp)
174       if (!entry.symbol_regexp->Execute(function_name.GetStringRef()))
175         continue;
176 
177     if (entry.first_instruction_only)
178       if (start_addr != current_addr)
179         continue;
180 
181     return entry.recognizer;
182   }
183   return StackFrameRecognizerSP();
184 }
185 
186 RecognizedStackFrameSP
187 StackFrameRecognizerManager::RecognizeFrame(StackFrameSP frame) {
188   auto recognizer = GetRecognizerForFrame(frame);
189   if (!recognizer)
190     return RecognizedStackFrameSP();
191   return recognizer->RecognizeFrame(frame);
192 }
193