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[lldb] Fix+re-enable Assert StackFrame Recognizer on Linux 

D73303 was failing on Fedora Linux and so it was disabled by Skip the
AssertFrameRecognizer test for Linux.

I find no easy way how to find out if it gets recognized as
`__assert_fail` or `__GI___assert_fail` as during `Process` ctor
libc.so.6 is not yet loaded by the debuggee.

DWARF symbol `__GI___assert_fail` overrides the ELF symbol `__assert_fail`.
While external debug info (=DWARF) gets disabled for testsuite (D55859)
that sure does not apply for real world usage.

Differential Revision: https://reviews.llvm.org/D74252
This commit is contained in:
Jan Kratochvil 2020-02-10 10:29:26 +01:00
parent 6115bd9ba2
commit 1a39f1b966
7 changed files with 70 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
lldb/include/lldb/Target/StackFrameRecognizer.h
View File

@ -101,8 +101,8 @@ private:
class StackFrameRecognizerManager {
public:
static void AddRecognizer(lldb::StackFrameRecognizerSP recognizer,
ConstString module,
ConstString symbol,
ConstString module, ConstString symbol,
ConstString alternate_symbol,
bool first_instruction_only = true);
static void AddRecognizer(lldb::StackFrameRecognizerSP recognizer,
@ -113,7 +113,8 @@ public:
static void ForEach(
std::function<void(uint32_t recognizer_id, std::string recognizer_name,
std::string module, std::string symbol,
bool regexp)> const &callback);
std::string alternate_symbol, bool regexp)> const
&callback);
static bool RemoveRecognizerWithID(uint32_t recognizer_id);

9
lldb/source/Commands/CommandObjectFrame.cpp
View File

@ -881,7 +881,7 @@ bool CommandObjectFrameRecognizerAdd::DoExecute(Args &command,
} else {
auto module = ConstString(m_options.m_module);
auto func = ConstString(m_options.m_function);
StackFrameRecognizerManager::AddRecognizer(recognizer_sp, module, func);
StackFrameRecognizerManager::AddRecognizer(recognizer_sp, module, func, {});
}
#endif
@ -960,12 +960,13 @@ protected:
StackFrameRecognizerManager::ForEach(
[&result, &any_printed](uint32_t recognizer_id, std::string name,
std::string function, std::string symbol,
bool regexp) {
std::string alternate_symbol, bool regexp) {
if (name == "")
name = "(internal)";
result.GetOutputStream().Printf(
"%d: %s, module %s, function %s%s\n", recognizer_id, name.c_str(),
function.c_str(), symbol.c_str(), regexp ? " (regexp)" : "");
"%d: %s, module %s, function %s{%s}%s\n", recognizer_id,
name.c_str(), function.c_str(), symbol.c_str(),
alternate_symbol.c_str(), regexp ? " (regexp)" : "");
any_printed = true;
});

3
lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
View File

@ -2691,6 +2691,7 @@ static void RegisterObjCExceptionRecognizer() {
std::tie(module, function) = AppleObjCRuntime::GetExceptionThrowLocation();
StackFrameRecognizerManager::AddRecognizer(
StackFrameRecognizerSP(new ObjCExceptionThrowFrameRecognizer()),
module.GetFilename(), function, /*first_instruction_only*/ true);
module.GetFilename(), function, /*alternate_symbol*/ {},
/*first_instruction_only*/ true);
});
}

71
lldb/source/Target/AssertFrameRecognizer.cpp
View File

@ -16,26 +16,6 @@ using namespace lldb;
using namespace lldb_private;
namespace lldb_private {
/// Checkes if the module containing a symbol has debug info.
///
/// \param[in] target
/// The target containing the module.
/// \param[in] module_spec
/// The module spec that should contain the symbol.
/// \param[in] symbol_name
/// The symbol's name that should be contained in the debug info.
/// \return
/// If \b true the symbol was found, \b false otherwise.
bool ModuleHasDebugInfo(Target &target, FileSpec &module_spec,
StringRef symbol_name) {
ModuleSP module_sp = target.GetImages().FindFirstModule(module_spec);
if (!module_sp)
return false;
return module_sp->FindFirstSymbolWithNameAndType(ConstString(symbol_name));
}
/// Fetches the abort frame location depending on the current platform.
///
/// \param[in] process_sp
@ -43,14 +23,15 @@ bool ModuleHasDebugInfo(Target &target, FileSpec &module_spec,
/// the target and the platform.
/// \return
/// If the platform is supported, returns an optional tuple containing
/// the abort module as a \a FileSpec and the symbol name as a \a StringRef.
/// the abort module as a \a FileSpec and two symbol names as two \a
/// StringRef. The second \a StringRef may be empty.
/// Otherwise, returns \a llvm::None.
llvm::Optional<std::tuple<FileSpec, StringRef>>
llvm::Optional<std::tuple<FileSpec, StringRef, StringRef>>
GetAbortLocation(Process *process) {
Target &target = process->GetTarget();
FileSpec module_spec;
StringRef symbol_name;
StringRef symbol_name, alternate_symbol_name;
switch (target.GetArchitecture().GetTriple().getOS()) {
case llvm::Triple::Darwin:
@ -60,9 +41,8 @@ GetAbortLocation(Process *process) {
break;
case llvm::Triple::Linux:
module_spec = FileSpec("libc.so.6");
symbol_name = "__GI_raise";
if (!ModuleHasDebugInfo(target, module_spec, symbol_name))
symbol_name = "raise";
symbol_name = "raise";
alternate_symbol_name = "__GI_raise";
break;
default:
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
@ -70,7 +50,7 @@ GetAbortLocation(Process *process) {
return llvm::None;
}
return std::make_tuple(module_spec, symbol_name);
return std::make_tuple(module_spec, symbol_name, alternate_symbol_name);
}
/// Fetches the assert frame location depending on the current platform.
@ -80,15 +60,15 @@ GetAbortLocation(Process *process) {
/// the target and the platform.
/// \return
/// If the platform is supported, returns an optional tuple containing
/// the asserting frame module as a \a FileSpec and the symbol name as a \a
/// StringRef.
/// the asserting frame module as a \a FileSpec and two possible symbol
/// names as two \a StringRef. The second \a StringRef may be empty.
/// Otherwise, returns \a llvm::None.
llvm::Optional<std::tuple<FileSpec, StringRef>>
llvm::Optional<std::tuple<FileSpec, StringRef, StringRef>>
GetAssertLocation(Process *process) {
Target &target = process->GetTarget();
FileSpec module_spec;
StringRef symbol_name;
StringRef symbol_name, alternate_symbol_name;
switch (target.GetArchitecture().GetTriple().getOS()) {
case llvm::Triple::Darwin:
@ -98,9 +78,8 @@ GetAssertLocation(Process *process) {
break;
case llvm::Triple::Linux:
module_spec = FileSpec("libc.so.6");
symbol_name = "__GI___assert_fail";
if (!ModuleHasDebugInfo(target, module_spec, symbol_name))
symbol_name = "__assert_fail";
symbol_name = "__assert_fail";
alternate_symbol_name = "__GI___assert_fail";
break;
default:
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
@ -108,7 +87,7 @@ GetAssertLocation(Process *process) {
return llvm::None;
}
return std::make_tuple(module_spec, symbol_name);
return std::make_tuple(module_spec, symbol_name, alternate_symbol_name);
}
void RegisterAssertFrameRecognizer(Process *process) {
@ -120,12 +99,14 @@ void RegisterAssertFrameRecognizer(Process *process) {
return;
FileSpec module_spec;
StringRef function_name;
std::tie(module_spec, function_name) = *abort_location;
StringRef function_name, alternate_function_name;
std::tie(module_spec, function_name, alternate_function_name) =
*abort_location;
StackFrameRecognizerManager::AddRecognizer(
StackFrameRecognizerSP(new AssertFrameRecognizer()),
module_spec.GetFilename(), ConstString(function_name), false);
module_spec.GetFilename(), ConstString(function_name),
ConstString(alternate_function_name), /*first_instruction_only*/ false);
});
}
@ -142,8 +123,9 @@ AssertFrameRecognizer::RecognizeFrame(lldb::StackFrameSP frame_sp) {
return RecognizedStackFrameSP();
FileSpec module_spec;
StringRef function_name;
std::tie(module_spec, function_name) = *assert_location;
StringRef function_name, alternate_function_name;
std::tie(module_spec, function_name, alternate_function_name) =
*assert_location;
const uint32_t frames_to_fetch = 5;
const uint32_t last_frame_index = frames_to_fetch - 1;
@ -163,8 +145,13 @@ AssertFrameRecognizer::RecognizeFrame(lldb::StackFrameSP frame_sp) {
SymbolContext sym_ctx =
prev_frame_sp->GetSymbolContext(eSymbolContextEverything);
if (sym_ctx.module_sp->GetFileSpec().FileEquals(module_spec) &&
sym_ctx.GetFunctionName() == ConstString(function_name)) {
if (!sym_ctx.module_sp->GetFileSpec().FileEquals(module_spec))
continue;
ConstString func_name = sym_ctx.GetFunctionName();
if (func_name == ConstString(function_name) ||
alternate_function_name.empty() ||
func_name == ConstString(alternate_function_name)) {
// We go a frame beyond the assert location because the most relevant
// frame for the user is the one in which the assert function was called.

45
lldb/source/Target/StackFrameRecognizer.cpp
View File

@ -50,24 +50,28 @@ ScriptedStackFrameRecognizer::RecognizeFrame(lldb::StackFrameSP frame) {
class StackFrameRecognizerManagerImpl {
public:
void AddRecognizer(StackFrameRecognizerSP recognizer,
ConstString module, ConstString symbol,
void AddRecognizer(StackFrameRecognizerSP recognizer, ConstString module,
ConstString symbol, ConstString alternate_symbol,
bool first_instruction_only) {
m_recognizers.push_front({(uint32_t)m_recognizers.size(), false, recognizer, false, module, RegularExpressionSP(),
symbol, RegularExpressionSP(),
m_recognizers.push_front({(uint32_t)m_recognizers.size(), false, recognizer,
false, module, RegularExpressionSP(), symbol,
alternate_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,
m_recognizers.push_front({(uint32_t)m_recognizers.size(), false, recognizer,
true, ConstString(), module, ConstString(),
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) {
std::function<void(uint32_t recognized_id, std::string recognizer_name,
std::string module, std::string symbol,
std::string alternate_symbol, bool regexp)> const
&callback) {
for (auto entry : m_recognizers) {
if (entry.is_regexp) {
std::string module_name;
@ -79,11 +83,12 @@ public:
symbol_name = entry.symbol_regexp->GetText().str();
callback(entry.recognizer_id, entry.recognizer->GetName(), module_name,
symbol_name, true);
symbol_name, {}, true);
} else {
callback(entry.recognizer_id, entry.recognizer->GetName(), entry.module.GetCString(),
entry.symbol.GetCString(), false);
callback(entry.recognizer_id, entry.recognizer->GetName(),
entry.module.GetCString(), entry.symbol.GetCString(),
entry.alternate_symbol.GetCString(), false);
}
}
}
@ -120,7 +125,10 @@ public:
if (!entry.module_regexp->Execute(module_name.GetStringRef())) continue;
if (entry.symbol)
if (entry.symbol != function_name) continue;
if (entry.symbol != function_name &&
(!entry.alternate_symbol ||
entry.alternate_symbol != function_name))
continue;
if (entry.symbol_regexp)
if (!entry.symbol_regexp->Execute(function_name.GetStringRef()))
@ -149,6 +157,7 @@ public:
ConstString module;
RegularExpressionSP module_regexp;
ConstString symbol;
ConstString alternate_symbol;
RegularExpressionSP symbol_regexp;
bool first_instruction_only;
};
@ -163,10 +172,10 @@ StackFrameRecognizerManagerImpl &GetStackFrameRecognizerManagerImpl() {
}
void StackFrameRecognizerManager::AddRecognizer(
StackFrameRecognizerSP recognizer, ConstString module,
ConstString symbol, bool first_instruction_only) {
GetStackFrameRecognizerManagerImpl().AddRecognizer(recognizer, module, symbol,
first_instruction_only);
StackFrameRecognizerSP recognizer, ConstString module, ConstString symbol,
ConstString alternate_symbol, bool first_instruction_only) {
GetStackFrameRecognizerManagerImpl().AddRecognizer(
recognizer, module, symbol, alternate_symbol, first_instruction_only);
}
void StackFrameRecognizerManager::AddRecognizer(
@ -177,8 +186,10 @@ void StackFrameRecognizerManager::AddRecognizer(
}
void StackFrameRecognizerManager::ForEach(
std::function<void(uint32_t recognized_id, std::string recognizer_name, std::string module,
std::string symbol, bool regexp)> const &callback) {
std::function<void(uint32_t recognized_id, std::string recognizer_name,
std::string module, std::string symbol,
std::string alternate_symbol, bool regexp)> const
&callback) {
GetStackFrameRecognizerManagerImpl().ForEach(callback);
}

2
lldb/test/Shell/Recognizer/assert.test
View File

@ -1,4 +1,4 @@
# UNSUPPORTED: system-windows, system-linux
# UNSUPPORTED: system-windows
# RUN: %clang_host -g -O0 %S/Inputs/assert.c -o %t.out
# RUN: %lldb -b -s %s %t.out | FileCheck %s
run

1
lldb/unittests/Target/StackFrameRecognizerTest.cpp
View File

@ -77,6 +77,7 @@ TEST_F(StackFrameRecognizerTest, NullModuleRegex) {
StackFrameRecognizerManager::ForEach(
[&any_printed](uint32_t recognizer_id, std::string name,
std::string function, std::string symbol,
std::string alternate_symbol,
bool regexp) { any_printed = true; });
EXPECT_TRUE(any_printed);