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//===-- StackFrameRecognizer.cpp ------------------------------------------===//
//
// 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 "lldb/Target/StackFrameRecognizer.h"
#include "lldb/Core/Module.h"
#include "lldb/Interpreter/ScriptInterpreter.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Utility/RegularExpression.h"
using namespace lldb;
using namespace lldb_private;
class ScriptedRecognizedStackFrame : public RecognizedStackFrame {
bool m_hidden;
public:
ScriptedRecognizedStackFrame(ValueObjectListSP args, bool hidden)
: m_hidden(hidden) {
m_arguments = std::move(args);
}
bool ShouldHide() override { return m_hidden; }
};
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());
if (args) {
for (const auto &o : args->GetObjects())
args_synthesized->Append(ValueObjectRecognizerSynthesizedValue::Create(
*o, eValueTypeVariableArgument));
}
bool hidden = m_interpreter->ShouldHide(m_python_object_sp, frame);
return RecognizedStackFrameSP(
new ScriptedRecognizedStackFrame(args_synthesized, hidden));
}
void StackFrameRecognizerManager::BumpGeneration() {
uint32_t n = m_generation;
n = (n + 1) & ((1 << 16) - 1);
m_generation = n;
}
void StackFrameRecognizerManager::AddRecognizer(
StackFrameRecognizerSP recognizer, ConstString module,
llvm::ArrayRef<ConstString> symbols,
Mangled::NamePreference symbol_mangling, bool first_instruction_only) {
m_recognizers.push_front({(uint32_t)m_recognizers.size(), recognizer, false,
module, RegularExpressionSP(), symbols,
RegularExpressionSP(), symbol_mangling,
first_instruction_only, true});
BumpGeneration();
}
void StackFrameRecognizerManager::AddRecognizer(
StackFrameRecognizerSP recognizer, RegularExpressionSP module,
RegularExpressionSP symbol, Mangled::NamePreference symbol_mangling,
bool first_instruction_only) {
m_recognizers.push_front({(uint32_t)m_recognizers.size(), recognizer, true,
ConstString(), module, std::vector<ConstString>(),
symbol, symbol_mangling, first_instruction_only,
true});
BumpGeneration();
}
void StackFrameRecognizerManager::ForEach(
const std::function<void(
uint32_t, bool, std::string, std::string, llvm::ArrayRef<ConstString>,
Mangled::NamePreference name_preference, bool)> &callback) {
for (auto entry : m_recognizers) {
if (entry.is_regexp) {
std::string module_name;
std::string symbol_name;
if (entry.module_regexp)
module_name = entry.module_regexp->GetText().str();
if (entry.symbol_regexp)
symbol_name = entry.symbol_regexp->GetText().str();
callback(entry.recognizer_id, entry.enabled, entry.recognizer->GetName(),
module_name, llvm::ArrayRef(ConstString(symbol_name)),
entry.symbol_mangling, true);
} else {
callback(entry.recognizer_id, entry.enabled, entry.recognizer->GetName(),
entry.module.GetCString(), entry.symbols, entry.symbol_mangling,
false);
}
}
}
bool StackFrameRecognizerManager::SetEnabledForID(uint32_t recognizer_id,
bool enabled) {
auto found =
llvm::find_if(m_recognizers, [recognizer_id](const RegisteredEntry &e) {
return e.recognizer_id == recognizer_id;
});
if (found == m_recognizers.end())
return false;
found->enabled = enabled;
BumpGeneration();
return true;
}
bool StackFrameRecognizerManager::RemoveRecognizerWithID(
uint32_t recognizer_id) {
auto found =
llvm::find_if(m_recognizers, [recognizer_id](const RegisteredEntry &e) {
return e.recognizer_id == recognizer_id;
});
if (found == m_recognizers.end())
return false;
m_recognizers.erase(found);
BumpGeneration();
return true;
}
void StackFrameRecognizerManager::RemoveAllRecognizers() {
BumpGeneration();
m_recognizers.clear();
}
StackFrameRecognizerSP
StackFrameRecognizerManager::GetRecognizerForFrame(StackFrameSP frame) {
const SymbolContext &symctx = frame->GetSymbolContext(
eSymbolContextModule | eSymbolContextFunction | eSymbolContextSymbol);
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.enabled)
continue;
if (entry.module)
if (entry.module != module_name)
continue;
if (entry.module_regexp)
if (!entry.module_regexp->Execute(module_name.GetStringRef()))
continue;
ConstString function_name = symctx.GetFunctionName(entry.symbol_mangling);
if (!entry.symbols.empty())
if (!llvm::is_contained(entry.symbols, 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
StackFrameRecognizerManager::RecognizeFrame(StackFrameSP frame) {
auto recognizer = GetRecognizerForFrame(frame);
if (!recognizer)
return RecognizedStackFrameSP();
return recognizer->RecognizeFrame(frame);
}
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