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//===-- StackFrameRecognizer.cpp --------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <vector>
#include "lldb/Core/Module.h"
#include "lldb/Interpreter/ScriptInterpreter.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/StackFrameRecognizer.h"
#include "lldb/Utility/RegularExpression.h"
using namespace lldb;
using namespace lldb_private;
class ScriptedRecognizedStackFrame : public RecognizedStackFrame {
public:
ScriptedRecognizedStackFrame(ValueObjectListSP args) {
m_arguments = args;
}
};
ScriptedStackFrameRecognizer::ScriptedStackFrameRecognizer(
ScriptInterpreter *interpreter, const char *pclass)
: m_interpreter(interpreter), m_python_class(pclass) {
m_python_object_sp =
m_interpreter->CreateFrameRecognizer(m_python_class.c_str());
}
RecognizedStackFrameSP
ScriptedStackFrameRecognizer::RecognizeFrame(lldb::StackFrameSP frame) {
if (!m_python_object_sp || !m_interpreter)
return RecognizedStackFrameSP();
ValueObjectListSP args =
m_interpreter->GetRecognizedArguments(m_python_object_sp, frame);
auto args_synthesized = ValueObjectListSP(new ValueObjectList());
for (const auto o : args->GetObjects()) {
args_synthesized->Append(ValueObjectRecognizerSynthesizedValue::Create(
*o, eValueTypeVariableArgument));
}
return RecognizedStackFrameSP(
new ScriptedRecognizedStackFrame(args_synthesized));
}
class StackFrameRecognizerManagerImpl {
public:
void AddRecognizer(StackFrameRecognizerSP recognizer,
ConstString module, ConstString symbol,
bool first_instruction_only) {
m_recognizers.push_front({(uint32_t)m_recognizers.size(), false, recognizer, false, module, RegularExpressionSP(),
symbol, RegularExpressionSP(),
first_instruction_only});
}
void AddRecognizer(StackFrameRecognizerSP recognizer,
RegularExpressionSP module, RegularExpressionSP symbol,
bool first_instruction_only) {
m_recognizers.push_front({(uint32_t)m_recognizers.size(), false, recognizer, true, ConstString(), module,
ConstString(), symbol, first_instruction_only});
}
void ForEach(
std::function<void(uint32_t recognized_id, std::string recognizer_name, std::string module,
std::string symbol, bool regexp)> const &callback) {
for (auto entry : m_recognizers) {
if (entry.is_regexp) {
callback(entry.recognizer_id, entry.recognizer->GetName(), entry.module_regexp->GetText(),
entry.symbol_regexp->GetText(), true);
} else {
callback(entry.recognizer_id, entry.recognizer->GetName(), entry.module.GetCString(),
entry.symbol.GetCString(), false);
}
}
}
bool RemoveRecognizerWithID(uint32_t recognizer_id) {
if (recognizer_id >= m_recognizers.size()) return false;
if (m_recognizers[recognizer_id].deleted) return false;
m_recognizers[recognizer_id].deleted = true;
return true;
}
void RemoveAllRecognizers() {
m_recognizers.clear();
}
StackFrameRecognizerSP GetRecognizerForFrame(StackFrameSP frame) {
const SymbolContext &symctx =
frame->GetSymbolContext(eSymbolContextModule | eSymbolContextFunction);
ConstString function_name = symctx.GetFunctionName();
ModuleSP module_sp = symctx.module_sp;
if (!module_sp) return StackFrameRecognizerSP();
ConstString module_name = module_sp->GetFileSpec().GetFilename();
Symbol *symbol = symctx.symbol;
if (!symbol) return StackFrameRecognizerSP();
Address start_addr = symbol->GetAddress();
Address current_addr = frame->GetFrameCodeAddress();
for (auto entry : m_recognizers) {
if (entry.deleted) continue;
if (entry.module)
if (entry.module != module_name) continue;
if (entry.module_regexp)
if (!entry.module_regexp->Execute(module_name.GetStringRef())) continue;
if (entry.symbol)
if (entry.symbol != function_name) continue;
if (entry.symbol_regexp)
if (!entry.symbol_regexp->Execute(function_name.GetStringRef()))
continue;
if (entry.first_instruction_only)
if (start_addr != current_addr) continue;
return entry.recognizer;
}
return StackFrameRecognizerSP();
}
RecognizedStackFrameSP RecognizeFrame(StackFrameSP frame) {
auto recognizer = GetRecognizerForFrame(frame);
if (!recognizer) return RecognizedStackFrameSP();
return recognizer->RecognizeFrame(frame);
}
private:
struct RegisteredEntry {
uint32_t recognizer_id;
bool deleted;
StackFrameRecognizerSP recognizer;
bool is_regexp;
ConstString module;
RegularExpressionSP module_regexp;
ConstString symbol;
RegularExpressionSP symbol_regexp;
bool first_instruction_only;
};
std::deque<RegisteredEntry> m_recognizers;
};
StackFrameRecognizerManagerImpl &GetStackFrameRecognizerManagerImpl() {
static StackFrameRecognizerManagerImpl instance =
StackFrameRecognizerManagerImpl();
return instance;
}
void StackFrameRecognizerManager::AddRecognizer(
StackFrameRecognizerSP recognizer, ConstString module,
ConstString symbol, bool first_instruction_only) {
GetStackFrameRecognizerManagerImpl().AddRecognizer(recognizer, module, symbol,
first_instruction_only);
}
void StackFrameRecognizerManager::AddRecognizer(
StackFrameRecognizerSP recognizer, RegularExpressionSP module,
RegularExpressionSP symbol, bool first_instruction_only) {
GetStackFrameRecognizerManagerImpl().AddRecognizer(recognizer, module, symbol,
first_instruction_only);
}
void StackFrameRecognizerManager::ForEach(
std::function<void(uint32_t recognized_id, std::string recognizer_name, std::string module,
std::string symbol, bool regexp)> const &callback) {
GetStackFrameRecognizerManagerImpl().ForEach(callback);
}
void StackFrameRecognizerManager::RemoveAllRecognizers() {
GetStackFrameRecognizerManagerImpl().RemoveAllRecognizers();
}
bool StackFrameRecognizerManager::RemoveRecognizerWithID(uint32_t recognizer_id) {
return GetStackFrameRecognizerManagerImpl().RemoveRecognizerWithID(recognizer_id);
}
RecognizedStackFrameSP StackFrameRecognizerManager::RecognizeFrame(
StackFrameSP frame) {
return GetStackFrameRecognizerManagerImpl().RecognizeFrame(frame);
}
StackFrameRecognizerSP StackFrameRecognizerManager::GetRecognizerForFrame(
lldb::StackFrameSP frame) {
return GetStackFrameRecognizerManagerImpl().GetRecognizerForFrame(frame);
}
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