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llvm-project/lldb/source/Commands/CommandObjectExpression.cpp

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//===-- CommandObjectExpression.cpp -----------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
// Other libraries and framework includes
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
// Project includes
#include "CommandObjectExpression.h"
#include "Plugins/ExpressionParser/Clang/ClangExpressionVariable.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObjectVariable.h"
#include "lldb/DataFormatters/ValueObjectPrinter.h"
#include "lldb/Expression/DWARFExpression.h"
#include "lldb/Expression/REPL.h"
#include "lldb/Expression/UserExpression.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/OptionParser.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Interpreter/OptionArgParser.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/Variable.h"
#include "lldb/Target/Language.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
using namespace lldb;
using namespace lldb_private;
CommandObjectExpression::CommandOptions::CommandOptions() : OptionGroup() {}
CommandObjectExpression::CommandOptions::~CommandOptions() = default;
static OptionEnumValueElement g_description_verbosity_type[] = {
{eLanguageRuntimeDescriptionDisplayVerbosityCompact, "compact",
"Only show the description string"},
{eLanguageRuntimeDescriptionDisplayVerbosityFull, "full",
"Show the full output, including persistent variable's name and type"},
{0, nullptr, nullptr}};
static OptionDefinition g_expression_options[] = {
// clang-format off
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "all-threads", 'a', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeBoolean, "Should we run all threads if the execution doesn't complete on one thread."},
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "ignore-breakpoints", 'i', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeBoolean, "Ignore breakpoint hits while running expressions"},
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "timeout", 't', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeUnsignedInteger, "Timeout value (in microseconds) for running the expression."},
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "unwind-on-error", 'u', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeBoolean, "Clean up program state if the expression causes a crash, or raises a signal. "
"Note, unlike gdb hitting a breakpoint is controlled by another option (-i)."},
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "debug", 'g', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "When specified, debug the JIT code by setting a breakpoint on the first instruction "
"and forcing breakpoints to not be ignored (-i0) and no unwinding to happen on error (-u0)."},
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "language", 'l', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeLanguage, "Specifies the Language to use when parsing the expression. If not set the target.language "
"setting is used." },
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "apply-fixits", 'X', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeLanguage, "If true, simple fix-it hints will be automatically applied to the expression." },
{LLDB_OPT_SET_1, false, "description-verbosity", 'v', OptionParser::eOptionalArgument, nullptr, g_description_verbosity_type, 0, eArgTypeDescriptionVerbosity, "How verbose should the output of this expression be, if the object description is asked for."},
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "top-level", 'p', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "Interpret the expression as a complete translation unit, without injecting it into the local "
"context. Allows declaration of persistent, top-level entities without a $ prefix."},
{LLDB_OPT_SET_1 | LLDB_OPT_SET_2, false, "allow-jit", 'j', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeBoolean, "Controls whether the expression can fall back to being JITted if it's not supported by "
"the interpreter (defaults to true)."}
// clang-format on
};
Status CommandObjectExpression::CommandOptions::SetOptionValue(
uint32_t option_idx, llvm::StringRef option_arg,
ExecutionContext *execution_context) {
Status error;
const int short_option = GetDefinitions()[option_idx].short_option;
switch (short_option) {
case 'l':
language = Language::GetLanguageTypeFromString(option_arg);
if (language == eLanguageTypeUnknown)
error.SetErrorStringWithFormat(
"unknown language type: '%s' for expression",
option_arg.str().c_str());
break;
case 'a': {
bool success;
bool result;
result = OptionArgParser::ToBoolean(option_arg, true, &success);
if (!success)
error.SetErrorStringWithFormat(
"invalid all-threads value setting: \"%s\"",
option_arg.str().c_str());
else
try_all_threads = result;
} break;
case 'i': {
bool success;
bool tmp_value = OptionArgParser::ToBoolean(option_arg, true, &success);
if (success)
ignore_breakpoints = tmp_value;
else
error.SetErrorStringWithFormat(
"could not convert \"%s\" to a boolean value.",
option_arg.str().c_str());
break;
}
case 'j': {
bool success;
bool tmp_value = OptionArgParser::ToBoolean(option_arg, true, &success);
if (success)
allow_jit = tmp_value;
else
error.SetErrorStringWithFormat(
"could not convert \"%s\" to a boolean value.",
option_arg.str().c_str());
break;
}
case 't':
if (option_arg.getAsInteger(0, timeout)) {
timeout = 0;
error.SetErrorStringWithFormat("invalid timeout setting \"%s\"",
option_arg.str().c_str());
}
break;
case 'u': {
bool success;
bool tmp_value = OptionArgParser::ToBoolean(option_arg, true, &success);
if (success)
unwind_on_error = tmp_value;
else
error.SetErrorStringWithFormat(
"could not convert \"%s\" to a boolean value.",
option_arg.str().c_str());
break;
}
case 'v':
if (option_arg.empty()) {
m_verbosity = eLanguageRuntimeDescriptionDisplayVerbosityFull;
break;
}
m_verbosity = (LanguageRuntimeDescriptionDisplayVerbosity)
OptionArgParser::ToOptionEnum(
option_arg, GetDefinitions()[option_idx].enum_values, 0, error);
if (!error.Success())
error.SetErrorStringWithFormat(
"unrecognized value for description-verbosity '%s'",
option_arg.str().c_str());
break;
case 'g':
debug = true;
unwind_on_error = false;
ignore_breakpoints = false;
break;
case 'p':
top_level = true;
break;
case 'X': {
bool success;
bool tmp_value = OptionArgParser::ToBoolean(option_arg, true, &success);
if (success)
auto_apply_fixits = tmp_value ? eLazyBoolYes : eLazyBoolNo;
else
error.SetErrorStringWithFormat(
"could not convert \"%s\" to a boolean value.",
option_arg.str().c_str());
break;
}
default:
error.SetErrorStringWithFormat("invalid short option character '%c'",
short_option);
break;
}
return error;
}
void CommandObjectExpression::CommandOptions::OptionParsingStarting(
ExecutionContext *execution_context) {
auto process_sp =
execution_context ? execution_context->GetProcessSP() : ProcessSP();
if (process_sp) {
ignore_breakpoints = process_sp->GetIgnoreBreakpointsInExpressions();
unwind_on_error = process_sp->GetUnwindOnErrorInExpressions();
} else {
ignore_breakpoints = true;
unwind_on_error = true;
}
show_summary = true;
try_all_threads = true;
timeout = 0;
debug = false;
language = eLanguageTypeUnknown;
m_verbosity = eLanguageRuntimeDescriptionDisplayVerbosityCompact;
auto_apply_fixits = eLazyBoolCalculate;
top_level = false;
allow_jit = true;
}
llvm::ArrayRef<OptionDefinition>
CommandObjectExpression::CommandOptions::GetDefinitions() {
return llvm::makeArrayRef(g_expression_options);
}
CommandObjectExpression::CommandObjectExpression(
CommandInterpreter &interpreter)
: CommandObjectRaw(
interpreter, "expression", "Evaluate an expression on the current "
"thread. Displays any returned value "
"with LLDB's default formatting.",
"", eCommandProcessMustBePaused | eCommandTryTargetAPILock),
IOHandlerDelegate(IOHandlerDelegate::Completion::Expression),
m_option_group(), m_format_options(eFormatDefault),
m_repl_option(LLDB_OPT_SET_1, false, "repl", 'r', "Drop into REPL", false,
true),
m_command_options(), m_expr_line_count(0), m_expr_lines() {
SetHelpLong(
R"(
Single and multi-line expressions:
)"
" The expression provided on the command line must be a complete expression \
with no newlines. To evaluate a multi-line expression, \
hit a return after an empty expression, and lldb will enter the multi-line expression editor. \
Hit return on an empty line to end the multi-line expression."
R"(
Timeouts:
)"
" If the expression can be evaluated statically (without running code) then it will be. \
Otherwise, by default the expression will run on the current thread with a short timeout: \
currently .25 seconds. If it doesn't return in that time, the evaluation will be interrupted \
and resumed with all threads running. You can use the -a option to disable retrying on all \
threads. You can use the -t option to set a shorter timeout."
R"(
User defined variables:
)"
" You can define your own variables for convenience or to be used in subsequent expressions. \
You define them the same way you would define variables in C. If the first character of \
your user defined variable is a $, then the variable's value will be available in future \
expressions, otherwise it will just be available in the current expression."
R"(
Continuing evaluation after a breakpoint:
)"
" If the \"-i false\" option is used, and execution is interrupted by a breakpoint hit, once \
you are done with your investigation, you can either remove the expression execution frames \
from the stack with \"thread return -x\" or if you are still interested in the expression result \
you can issue the \"continue\" command and the expression evaluation will complete and the \
expression result will be available using the \"thread.completed-expression\" key in the thread \
format."
R"(
Examples:
expr my_struct->a = my_array[3]
expr -f bin -- (index * 8) + 5
expr unsigned int $foo = 5
expr char c[] = \"foo\"; c[0])");
CommandArgumentEntry arg;
CommandArgumentData expression_arg;
// Define the first (and only) variant of this arg.
expression_arg.arg_type = eArgTypeExpression;
expression_arg.arg_repetition = eArgRepeatPlain;
// There is only one variant this argument could be; put it into the argument
// entry.
arg.push_back(expression_arg);
// Push the data for the first argument into the m_arguments vector.
m_arguments.push_back(arg);
// Add the "--format" and "--gdb-format"
m_option_group.Append(&m_format_options,
OptionGroupFormat::OPTION_GROUP_FORMAT |
OptionGroupFormat::OPTION_GROUP_GDB_FMT,
LLDB_OPT_SET_1);
m_option_group.Append(&m_command_options);
m_option_group.Append(&m_varobj_options, LLDB_OPT_SET_ALL,
LLDB_OPT_SET_1 | LLDB_OPT_SET_2);
m_option_group.Append(&m_repl_option, LLDB_OPT_SET_ALL, LLDB_OPT_SET_3);
m_option_group.Finalize();
}
CommandObjectExpression::~CommandObjectExpression() = default;
Options *CommandObjectExpression::GetOptions() { return &m_option_group; }
static lldb_private::Status
CanBeUsedForElementCountPrinting(ValueObject &valobj) {
CompilerType type(valobj.GetCompilerType());
CompilerType pointee;
if (!type.IsPointerType(&pointee))
return Status("as it does not refer to a pointer");
if (pointee.IsVoidType())
return Status("as it refers to a pointer to void");
return Status();
}
bool CommandObjectExpression::EvaluateExpression(const char *expr,
Stream *output_stream,
Stream *error_stream,
CommandReturnObject *result) {
// Don't use m_exe_ctx as this might be called asynchronously after the
// command object DoExecute has finished when doing multi-line expression
// that use an input reader...
ExecutionContext exe_ctx(m_interpreter.GetExecutionContext());
Target *target = exe_ctx.GetTargetPtr();
if (!target)
target = GetDummyTarget();
if (target) {
lldb::ValueObjectSP result_valobj_sp;
bool keep_in_memory = true;
StackFrame *frame = exe_ctx.GetFramePtr();
EvaluateExpressionOptions options;
options.SetCoerceToId(m_varobj_options.use_objc);
options.SetUnwindOnError(m_command_options.unwind_on_error);
options.SetIgnoreBreakpoints(m_command_options.ignore_breakpoints);
options.SetKeepInMemory(keep_in_memory);
options.SetUseDynamic(m_varobj_options.use_dynamic);
options.SetTryAllThreads(m_command_options.try_all_threads);
options.SetDebug(m_command_options.debug);
options.SetLanguage(m_command_options.language);
options.SetExecutionPolicy(
m_command_options.allow_jit
? EvaluateExpressionOptions::default_execution_policy
: lldb_private::eExecutionPolicyNever);
bool auto_apply_fixits;
if (m_command_options.auto_apply_fixits == eLazyBoolCalculate)
auto_apply_fixits = target->GetEnableAutoApplyFixIts();
else
auto_apply_fixits =
m_command_options.auto_apply_fixits == eLazyBoolYes ? true : false;
options.SetAutoApplyFixIts(auto_apply_fixits);
if (m_command_options.top_level)
options.SetExecutionPolicy(eExecutionPolicyTopLevel);
// If there is any chance we are going to stop and want to see what went
// wrong with our expression, we should generate debug info
if (!m_command_options.ignore_breakpoints ||
!m_command_options.unwind_on_error)
options.SetGenerateDebugInfo(true);
if (m_command_options.timeout > 0)
options.SetTimeout(std::chrono::microseconds(m_command_options.timeout));
else
options.SetTimeout(llvm::None);
ExpressionResults success = target->EvaluateExpression(
expr, frame, result_valobj_sp, options, &m_fixed_expression);
// We only tell you about the FixIt if we applied it. The compiler errors
// will suggest the FixIt if it parsed.
if (error_stream && !m_fixed_expression.empty() &&
target->GetEnableNotifyAboutFixIts()) {
if (success == eExpressionCompleted)
error_stream->Printf(
" Fix-it applied, fixed expression was: \n %s\n",
m_fixed_expression.c_str());
}
if (result_valobj_sp) {
Format format = m_format_options.GetFormat();
if (result_valobj_sp->GetError().Success()) {
if (format != eFormatVoid) {
if (format != eFormatDefault)
result_valobj_sp->SetFormat(format);
if (m_varobj_options.elem_count > 0) {
Status error(CanBeUsedForElementCountPrinting(*result_valobj_sp));
if (error.Fail()) {
result->AppendErrorWithFormat(
"expression cannot be used with --element-count %s\n",
error.AsCString(""));
result->SetStatus(eReturnStatusFailed);
return false;
}
}
DumpValueObjectOptions options(m_varobj_options.GetAsDumpOptions(
m_command_options.m_verbosity, format));
options.SetVariableFormatDisplayLanguage(
result_valobj_sp->GetPreferredDisplayLanguage());
result_valobj_sp->Dump(*output_stream, options);
if (result)
result->SetStatus(eReturnStatusSuccessFinishResult);
}
} else {
if (result_valobj_sp->GetError().GetError() ==
UserExpression::kNoResult) {
if (format != eFormatVoid &&
m_interpreter.GetDebugger().GetNotifyVoid()) {
error_stream->PutCString("(void)\n");
}
if (result)
result->SetStatus(eReturnStatusSuccessFinishResult);
} else {
const char *error_cstr = result_valobj_sp->GetError().AsCString();
if (error_cstr && error_cstr[0]) {
const size_t error_cstr_len = strlen(error_cstr);
const bool ends_with_newline =
error_cstr[error_cstr_len - 1] == '\n';
if (strstr(error_cstr, "error:") != error_cstr)
error_stream->PutCString("error: ");
error_stream->Write(error_cstr, error_cstr_len);
if (!ends_with_newline)
error_stream->EOL();
} else {
error_stream->PutCString("error: unknown error\n");
}
if (result)
result->SetStatus(eReturnStatusFailed);
}
}
}
} else {
error_stream->Printf("error: invalid execution context for expression\n");
return false;
}
return true;
}
void CommandObjectExpression::IOHandlerInputComplete(IOHandler &io_handler,
std::string &line) {
io_handler.SetIsDone(true);
// StreamSP output_stream =
// io_handler.GetDebugger().GetAsyncOutputStream();
// StreamSP error_stream = io_handler.GetDebugger().GetAsyncErrorStream();
StreamFileSP output_sp(io_handler.GetOutputStreamFile());
StreamFileSP error_sp(io_handler.GetErrorStreamFile());
EvaluateExpression(line.c_str(), output_sp.get(), error_sp.get());
if (output_sp)
output_sp->Flush();
if (error_sp)
error_sp->Flush();
}
bool CommandObjectExpression::IOHandlerIsInputComplete(IOHandler &io_handler,
StringList &lines) {
// An empty lines is used to indicate the end of input
const size_t num_lines = lines.GetSize();
if (num_lines > 0 && lines[num_lines - 1].empty()) {
// Remove the last empty line from "lines" so it doesn't appear in our
// resulting input and return true to indicate we are done getting lines
lines.PopBack();
return true;
}
return false;
}
void CommandObjectExpression::GetMultilineExpression() {
m_expr_lines.clear();
m_expr_line_count = 0;
Debugger &debugger = GetCommandInterpreter().GetDebugger();
bool color_prompt = debugger.GetUseColor();
const bool multiple_lines = true; // Get multiple lines
IOHandlerSP io_handler_sp(
new IOHandlerEditline(debugger, IOHandler::Type::Expression,
"lldb-expr", // Name of input reader for history
llvm::StringRef(), // No prompt
llvm::StringRef(), // Continuation prompt
multiple_lines, color_prompt,
1, // Show line numbers starting at 1
*this));
StreamFileSP output_sp(io_handler_sp->GetOutputStreamFile());
if (output_sp) {
output_sp->PutCString(
"Enter expressions, then terminate with an empty line to evaluate:\n");
output_sp->Flush();
}
debugger.PushIOHandler(io_handler_sp);
}
bool CommandObjectExpression::DoExecute(const char *command,
CommandReturnObject &result) {
m_fixed_expression.clear();
auto exe_ctx = GetCommandInterpreter().GetExecutionContext();
m_option_group.NotifyOptionParsingStarting(&exe_ctx);
if (command[0] == '\0') {
GetMultilineExpression();
return result.Succeeded();
}
OptionsWithRaw args(command);
const char *expr = args.GetRawPart().c_str();
if (args.HasArgs()) {
if (!ParseOptionsAndNotify(args.GetArgs(), result, m_option_group, exe_ctx))
return false;
if (m_repl_option.GetOptionValue().GetCurrentValue()) {
Target *target = m_interpreter.GetExecutionContext().GetTargetPtr();
if (target) {
// Drop into REPL
m_expr_lines.clear();
m_expr_line_count = 0;
Debugger &debugger = target->GetDebugger();
// Check if the LLDB command interpreter is sitting on top of a REPL
// that launched it...
if (debugger.CheckTopIOHandlerTypes(IOHandler::Type::CommandInterpreter,
IOHandler::Type::REPL)) {
// the LLDB command interpreter is sitting on top of a REPL that
// launched it, so just say the command interpreter is done and
// fall back to the existing REPL
m_interpreter.GetIOHandler(false)->SetIsDone(true);
} else {
// We are launching the REPL on top of the current LLDB command
// interpreter, so just push one
bool initialize = false;
Status repl_error;
REPLSP repl_sp(target->GetREPL(repl_error, m_command_options.language,
nullptr, false));
if (!repl_sp) {
initialize = true;
repl_sp = target->GetREPL(repl_error, m_command_options.language,
nullptr, true);
if (!repl_error.Success()) {
result.SetError(repl_error);
return result.Succeeded();
}
}
if (repl_sp) {
if (initialize) {
repl_sp->SetCommandOptions(m_command_options);
repl_sp->SetFormatOptions(m_format_options);
repl_sp->SetValueObjectDisplayOptions(m_varobj_options);
}
IOHandlerSP io_handler_sp(repl_sp->GetIOHandler());
io_handler_sp->SetIsDone(false);
debugger.PushIOHandler(io_handler_sp);
} else {
repl_error.SetErrorStringWithFormat(
"Couldn't create a REPL for %s",
Language::GetNameForLanguageType(m_command_options.language));
result.SetError(repl_error);
return result.Succeeded();
}
}
}
}
// No expression following options
else if (expr[0] == '\0') {
GetMultilineExpression();
return result.Succeeded();
}
}
Target *target = GetSelectedOrDummyTarget();
if (EvaluateExpression(expr, &(result.GetOutputStream()),
&(result.GetErrorStream()), &result)) {
if (!m_fixed_expression.empty() && target->GetEnableNotifyAboutFixIts()) {
CommandHistory &history = m_interpreter.GetCommandHistory();
// FIXME: Can we figure out what the user actually typed (e.g. some alias
// for expr???)
// If we can it would be nice to show that.
std::string fixed_command("expression ");
if (args.HasArgs()) {
// Add in any options that might have been in the original command:
fixed_command.append(args.GetArgStringWithDelimiter());
fixed_command.append(m_fixed_expression);
} else
fixed_command.append(m_fixed_expression);
history.AppendString(fixed_command);
}
// Increment statistics to record this expression evaluation success.
target->IncrementStats(StatisticKind::ExpressionSuccessful);
return true;
}
// Increment statistics to record this expression evaluation failure.
target->IncrementStats(StatisticKind::ExpressionFailure);
result.SetStatus(eReturnStatusFailed);
return false;
}
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