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llvm-project/lldb/source/Commands/CommandObjectFrame.cpp
Greg Clayton d9e416c0ea The second part in thread hardening the internals of LLDB where we make 
the lldb_private::StackFrame objects hold onto a weak pointer to the thread
object. The lldb_private::StackFrame objects the the most volatile objects
we have as when we are doing single stepping, frames can often get lost or
thrown away, only to be re-created as another object that still refers to the
same frame. We have another bug tracking that. But we need to be able to 
have frames no longer be able to get the thread when they are not part of
a thread anymore, and this is the first step (this fix makes that possible
but doesn't implement it yet).

Also changed lldb_private::ExecutionContextScope to return shared pointers to
all objects in the execution context to further thread harden the internals.

llvm-svn: 150871
2012-02-18 05:35:26 +00:00

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//===-- CommandObjectFrame.cpp ----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "CommandObjectFrame.h"
// C Includes
// C++ Includes
#include <string>
// Other libraries and framework includes
// Project includes
#include "lldb/Core/DataVisualization.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectVariable.h"
#include "lldb/Host/Host.h"
#include "lldb/Interpreter/Args.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Interpreter/Options.h"
#include "lldb/Interpreter/OptionGroupFormat.h"
#include "lldb/Interpreter/OptionGroupValueObjectDisplay.h"
#include "lldb/Interpreter/OptionGroupVariable.h"
#include "lldb/Symbol/ClangASTType.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/Type.h"
#include "lldb/Symbol/Variable.h"
#include "lldb/Symbol/VariableList.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/Target.h"
using namespace lldb;
using namespace lldb_private;
#pragma mark CommandObjectFrameInfo
//-------------------------------------------------------------------------
// CommandObjectFrameInfo
//-------------------------------------------------------------------------
class CommandObjectFrameInfo : public CommandObject
{
public:
CommandObjectFrameInfo (CommandInterpreter &interpreter) :
CommandObject (interpreter,
"frame info",
"List information about the currently selected frame in the current thread.",
"frame info",
eFlagProcessMustBeLaunched | eFlagProcessMustBePaused)
{
}
~CommandObjectFrameInfo ()
{
}
bool
Execute (Args& command,
CommandReturnObject &result)
{
ExecutionContext exe_ctx(m_interpreter.GetExecutionContext());
StackFrame *frame = exe_ctx.GetFramePtr();
if (frame)
{
frame->DumpUsingSettingsFormat (&result.GetOutputStream());
result.SetStatus (eReturnStatusSuccessFinishResult);
}
else
{
result.AppendError ("no current frame");
result.SetStatus (eReturnStatusFailed);
}
return result.Succeeded();
}
};
#pragma mark CommandObjectFrameSelect
//-------------------------------------------------------------------------
// CommandObjectFrameSelect
//-------------------------------------------------------------------------
class CommandObjectFrameSelect : public CommandObject
{
public:
class CommandOptions : public Options
{
public:
CommandOptions (CommandInterpreter &interpreter) :
Options(interpreter)
{
OptionParsingStarting ();
}
virtual
~CommandOptions ()
{
}
virtual Error
SetOptionValue (uint32_t option_idx, const char *option_arg)
{
Error error;
bool success = false;
char short_option = (char) m_getopt_table[option_idx].val;
switch (short_option)
{
case 'r':
relative_frame_offset = Args::StringToSInt32 (option_arg, INT32_MIN, 0, &success);
if (!success)
error.SetErrorStringWithFormat ("invalid frame offset argument '%s'", option_arg);
break;
default:
error.SetErrorStringWithFormat ("invalid short option character '%c'", short_option);
break;
}
return error;
}
void
OptionParsingStarting ()
{
relative_frame_offset = INT32_MIN;
}
const OptionDefinition*
GetDefinitions ()
{
return g_option_table;
}
// Options table: Required for subclasses of Options.
static OptionDefinition g_option_table[];
int32_t relative_frame_offset;
};
CommandObjectFrameSelect (CommandInterpreter &interpreter) :
CommandObject (interpreter,
"frame select",
"Select a frame by index from within the current thread and make it the current frame.",
NULL,
eFlagProcessMustBeLaunched | eFlagProcessMustBePaused),
m_options (interpreter)
{
CommandArgumentEntry arg;
CommandArgumentData index_arg;
// Define the first (and only) variant of this arg.
index_arg.arg_type = eArgTypeFrameIndex;
index_arg.arg_repetition = eArgRepeatOptional;
// There is only one variant this argument could be; put it into the argument entry.
arg.push_back (index_arg);
// Push the data for the first argument into the m_arguments vector.
m_arguments.push_back (arg);
}
~CommandObjectFrameSelect ()
{
}
virtual
Options *
GetOptions ()
{
return &m_options;
}
bool
Execute (Args& command,
CommandReturnObject &result)
{
ExecutionContext exe_ctx (m_interpreter.GetExecutionContext());
Thread *thread = exe_ctx.GetThreadPtr();
if (thread)
{
const uint32_t num_frames = thread->GetStackFrameCount();
uint32_t frame_idx = UINT32_MAX;
if (m_options.relative_frame_offset != INT32_MIN)
{
// The one and only argument is a signed relative frame index
frame_idx = thread->GetSelectedFrameIndex ();
if (frame_idx == UINT32_MAX)
frame_idx = 0;
if (m_options.relative_frame_offset < 0)
{
if (frame_idx >= -m_options.relative_frame_offset)
frame_idx += m_options.relative_frame_offset;
else
{
if (frame_idx == 0)
{
//If you are already at the bottom of the stack, then just warn and don't reset the frame.
result.AppendError("Already at the bottom of the stack");
result.SetStatus(eReturnStatusFailed);
return false;
}
else
frame_idx = 0;
}
}
else if (m_options.relative_frame_offset > 0)
{
if (num_frames - frame_idx > m_options.relative_frame_offset)
frame_idx += m_options.relative_frame_offset;
else
{
if (frame_idx == num_frames - 1)
{
//If we are already at the top of the stack, just warn and don't reset the frame.
result.AppendError("Already at the top of the stack");
result.SetStatus(eReturnStatusFailed);
return false;
}
else
frame_idx = num_frames - 1;
}
}
}
else
{
if (command.GetArgumentCount() == 1)
{
const char *frame_idx_cstr = command.GetArgumentAtIndex(0);
frame_idx = Args::StringToUInt32 (frame_idx_cstr, UINT32_MAX, 0);
}
else if (command.GetArgumentCount() == 0)
{
frame_idx = thread->GetSelectedFrameIndex ();
if (frame_idx == UINT32_MAX)
{
frame_idx = 0;
}
}
else
{
result.AppendError ("invalid arguments.\n");
m_options.GenerateOptionUsage (result.GetErrorStream(), this);
}
}
if (frame_idx < num_frames)
{
thread->SetSelectedFrameByIndex (frame_idx);
exe_ctx.SetFrameSP(thread->GetSelectedFrame ());
StackFrame *frame = exe_ctx.GetFramePtr();
if (frame)
{
bool already_shown = false;
SymbolContext frame_sc(frame->GetSymbolContext(eSymbolContextLineEntry));
if (m_interpreter.GetDebugger().GetUseExternalEditor() && frame_sc.line_entry.file && frame_sc.line_entry.line != 0)
{
already_shown = Host::OpenFileInExternalEditor (frame_sc.line_entry.file, frame_sc.line_entry.line);
}
bool show_frame_info = true;
bool show_source = !already_shown;
Debugger &debugger = m_interpreter.GetDebugger();
const uint32_t source_lines_before = debugger.GetStopSourceLineCount(true);
const uint32_t source_lines_after = debugger.GetStopSourceLineCount(false);
if (frame->GetStatus (result.GetOutputStream(),
show_frame_info,
show_source,
source_lines_before,
source_lines_after))
{
result.SetStatus (eReturnStatusSuccessFinishResult);
return result.Succeeded();
}
}
}
result.AppendErrorWithFormat ("Frame index (%u) out of range.\n", frame_idx);
}
else
{
result.AppendError ("no current thread");
}
result.SetStatus (eReturnStatusFailed);
return false;
}
protected:
CommandOptions m_options;
};
OptionDefinition
CommandObjectFrameSelect::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_1, false, "relative", 'r', required_argument, NULL, 0, eArgTypeOffset, "A relative frame index offset from the current frame index."},
{ 0, false, NULL, 0, 0, NULL, NULL, eArgTypeNone, NULL }
};
#pragma mark CommandObjectFrameVariable
//----------------------------------------------------------------------
// List images with associated information
//----------------------------------------------------------------------
class CommandObjectFrameVariable : public CommandObject
{
public:
CommandObjectFrameVariable (CommandInterpreter &interpreter) :
CommandObject (interpreter,
"frame variable",
"Show frame variables. All argument and local variables "
"that are in scope will be shown when no arguments are given. "
"If any arguments are specified, they can be names of "
"argument, local, file static and file global variables. "
"Children of aggregate variables can be specified such as "
"'var->child.x'.",
NULL,
eFlagProcessMustBeLaunched | eFlagProcessMustBePaused),
m_option_group (interpreter),
m_option_variable(true), // Include the frame specific options by passing "true"
m_option_format (eFormatDefault),
m_varobj_options()
{
CommandArgumentEntry arg;
CommandArgumentData var_name_arg;
// Define the first (and only) variant of this arg.
var_name_arg.arg_type = eArgTypeVarName;
var_name_arg.arg_repetition = eArgRepeatStar;
// There is only one variant this argument could be; put it into the argument entry.
arg.push_back (var_name_arg);
// Push the data for the first argument into the m_arguments vector.
m_arguments.push_back (arg);
m_option_group.Append (&m_option_variable, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
m_option_group.Append (&m_option_format, OptionGroupFormat::OPTION_GROUP_FORMAT | OptionGroupFormat::OPTION_GROUP_GDB_FMT, LLDB_OPT_SET_1);
m_option_group.Append (&m_varobj_options, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
m_option_group.Finalize();
}
virtual
~CommandObjectFrameVariable ()
{
}
virtual
Options *
GetOptions ()
{
return &m_option_group;
}
virtual bool
Execute
(
Args& command,
CommandReturnObject &result
)
{
ExecutionContext exe_ctx(m_interpreter.GetExecutionContext());
StackFrame *frame = exe_ctx.GetFramePtr();
if (frame == NULL)
{
result.AppendError ("you must be stopped in a valid stack frame to view frame variables.");
result.SetStatus (eReturnStatusFailed);
return false;
}
Stream &s = result.GetOutputStream();
bool get_file_globals = true;
// Be careful about the stack frame, if any summary formatter runs code, it might clear the StackFrameList
// for the thread. So hold onto a shared pointer to the frame so it stays alive.
VariableList *variable_list = frame->GetVariableList (get_file_globals);
VariableSP var_sp;
ValueObjectSP valobj_sp;
const char *name_cstr = NULL;
size_t idx;
TypeSummaryImplSP summary_format_sp;
if (!m_option_variable.summary.empty())
DataVisualization::NamedSummaryFormats::GetSummaryFormat(ConstString(m_option_variable.summary.c_str()), summary_format_sp);
ValueObject::DumpValueObjectOptions options;
options.SetPointerDepth(m_varobj_options.ptr_depth)
.SetMaximumDepth(m_varobj_options.max_depth)
.SetShowTypes(m_varobj_options.show_types)
.SetShowLocation(m_varobj_options.show_location)
.SetUseObjectiveC(m_varobj_options.use_objc)
.SetUseDynamicType(m_varobj_options.use_dynamic)
.SetUseSyntheticValue((lldb::SyntheticValueType)m_varobj_options.use_synth)
.SetFlatOutput(m_varobj_options.flat_output)
.SetOmitSummaryDepth(m_varobj_options.no_summary_depth)
.SetIgnoreCap(m_varobj_options.ignore_cap);
if (m_varobj_options.be_raw)
options.SetRawDisplay(true);
if (variable_list)
{
const Format format = m_option_format.GetFormat();
if (command.GetArgumentCount() > 0)
{
VariableList regex_var_list;
// If we have any args to the variable command, we will make
// variable objects from them...
for (idx = 0; (name_cstr = command.GetArgumentAtIndex(idx)) != NULL; ++idx)
{
if (m_option_variable.use_regex)
{
const uint32_t regex_start_index = regex_var_list.GetSize();
RegularExpression regex (name_cstr);
if (regex.Compile(name_cstr))
{
size_t num_matches = 0;
const size_t num_new_regex_vars = variable_list->AppendVariablesIfUnique(regex,
regex_var_list,
num_matches);
if (num_new_regex_vars > 0)
{
for (uint32_t regex_idx = regex_start_index, end_index = regex_var_list.GetSize();
regex_idx < end_index;
++regex_idx)
{
var_sp = regex_var_list.GetVariableAtIndex (regex_idx);
if (var_sp)
{
valobj_sp = frame->GetValueObjectForFrameVariable (var_sp, m_varobj_options.use_dynamic);
if (valobj_sp)
{
// if (format != eFormatDefault)
// valobj_sp->SetFormat (format);
if (m_option_variable.show_decl && var_sp->GetDeclaration ().GetFile())
{
bool show_fullpaths = false;
bool show_module = true;
if (var_sp->DumpDeclaration(&s, show_fullpaths, show_module))
s.PutCString (": ");
}
if (summary_format_sp)
valobj_sp->SetCustomSummaryFormat(summary_format_sp);
ValueObject::DumpValueObject (result.GetOutputStream(),
valobj_sp.get(),
options,
format);
}
}
}
}
else if (num_matches == 0)
{
result.GetErrorStream().Printf ("error: no variables matched the regular expression '%s'.\n", name_cstr);
}
}
else
{
char regex_error[1024];
if (regex.GetErrorAsCString(regex_error, sizeof(regex_error)))
result.GetErrorStream().Printf ("error: %s\n", regex_error);
else
result.GetErrorStream().Printf ("error: unkown regex error when compiling '%s'\n", name_cstr);
}
}
else // No regex, either exact variable names or variable expressions.
{
Error error;
uint32_t expr_path_options = StackFrame::eExpressionPathOptionCheckPtrVsMember;
lldb::VariableSP var_sp;
valobj_sp = frame->GetValueForVariableExpressionPath (name_cstr,
m_varobj_options.use_dynamic,
expr_path_options,
var_sp,
error);
if (valobj_sp)
{
// if (format != eFormatDefault)
// valobj_sp->SetFormat (format);
if (m_option_variable.show_decl && var_sp && var_sp->GetDeclaration ().GetFile())
{
var_sp->GetDeclaration ().DumpStopContext (&s, false);
s.PutCString (": ");
}
if (summary_format_sp)
valobj_sp->SetCustomSummaryFormat(summary_format_sp);
Stream &output_stream = result.GetOutputStream();
ValueObject::DumpValueObject (output_stream,
valobj_sp.get(),
valobj_sp->GetParent() ? name_cstr : NULL,
options,
format);
}
else
{
const char *error_cstr = error.AsCString(NULL);
if (error_cstr)
result.GetErrorStream().Printf("error: %s\n", error_cstr);
else
result.GetErrorStream().Printf ("error: unable to find any variable expression path that matches '%s'\n", name_cstr);
}
}
}
}
else // No command arg specified. Use variable_list, instead.
{
const uint32_t num_variables = variable_list->GetSize();
if (num_variables > 0)
{
for (uint32_t i=0; i<num_variables; i++)
{
var_sp = variable_list->GetVariableAtIndex(i);
bool dump_variable = true;
switch (var_sp->GetScope())
{
case eValueTypeVariableGlobal:
dump_variable = m_option_variable.show_globals;
if (dump_variable && m_option_variable.show_scope)
s.PutCString("GLOBAL: ");
break;
case eValueTypeVariableStatic:
dump_variable = m_option_variable.show_globals;
if (dump_variable && m_option_variable.show_scope)
s.PutCString("STATIC: ");
break;
case eValueTypeVariableArgument:
dump_variable = m_option_variable.show_args;
if (dump_variable && m_option_variable.show_scope)
s.PutCString(" ARG: ");
break;
case eValueTypeVariableLocal:
dump_variable = m_option_variable.show_locals;
if (dump_variable && m_option_variable.show_scope)
s.PutCString(" LOCAL: ");
break;
default:
break;
}
if (dump_variable)
{
// Use the variable object code to make sure we are
// using the same APIs as the the public API will be
// using...
valobj_sp = frame->GetValueObjectForFrameVariable (var_sp,
m_varobj_options.use_dynamic);
if (valobj_sp)
{
// if (format != eFormatDefault)
// valobj_sp->SetFormat (format);
// When dumping all variables, don't print any variables
// that are not in scope to avoid extra unneeded output
if (valobj_sp->IsInScope ())
{
if (m_option_variable.show_decl && var_sp->GetDeclaration ().GetFile())
{
var_sp->GetDeclaration ().DumpStopContext (&s, false);
s.PutCString (": ");
}
if (summary_format_sp)
valobj_sp->SetCustomSummaryFormat(summary_format_sp);
ValueObject::DumpValueObject (result.GetOutputStream(),
valobj_sp.get(),
name_cstr,
options,
format);
}
}
}
}
}
}
result.SetStatus (eReturnStatusSuccessFinishResult);
}
if (m_interpreter.TruncationWarningNecessary())
{
result.GetOutputStream().Printf(m_interpreter.TruncationWarningText(),
m_cmd_name.c_str());
m_interpreter.TruncationWarningGiven();
}
return result.Succeeded();
}
protected:
OptionGroupOptions m_option_group;
OptionGroupVariable m_option_variable;
OptionGroupFormat m_option_format;
OptionGroupValueObjectDisplay m_varobj_options;
};
#pragma mark CommandObjectMultiwordFrame
//-------------------------------------------------------------------------
// CommandObjectMultiwordFrame
//-------------------------------------------------------------------------
CommandObjectMultiwordFrame::CommandObjectMultiwordFrame (CommandInterpreter &interpreter) :
CommandObjectMultiword (interpreter,
"frame",
"A set of commands for operating on the current thread's frames.",
"frame <subcommand> [<subcommand-options>]")
{
LoadSubCommand ("info", CommandObjectSP (new CommandObjectFrameInfo (interpreter)));
LoadSubCommand ("select", CommandObjectSP (new CommandObjectFrameSelect (interpreter)));
LoadSubCommand ("variable", CommandObjectSP (new CommandObjectFrameVariable (interpreter)));
}
CommandObjectMultiwordFrame::~CommandObjectMultiwordFrame ()
{
}
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