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llvm-project/lldb/source/Target/StackFrame.cpp

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//===-- StackFrame.cpp ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/lldb-python.h"
#include "lldb/Target/StackFrame.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/Module.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Disassembler.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObjectVariable.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Symbol/SymbolContextScope.h"
#include "lldb/Symbol/VariableList.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
using namespace lldb;
using namespace lldb_private;
// The first bits in the flags are reserved for the SymbolContext::Scope bits
// so we know if we have tried to look up information in our internal symbol
// context (m_sc) already.
#define RESOLVED_FRAME_CODE_ADDR (uint32_t(eSymbolContextEverything + 1))
#define RESOLVED_FRAME_ID_SYMBOL_SCOPE (RESOLVED_FRAME_CODE_ADDR << 1)
#define GOT_FRAME_BASE (RESOLVED_FRAME_ID_SYMBOL_SCOPE << 1)
#define RESOLVED_VARIABLES (GOT_FRAME_BASE << 1)
#define RESOLVED_GLOBAL_VARIABLES (RESOLVED_VARIABLES << 1)
StackFrame::StackFrame (const ThreadSP &thread_sp,
user_id_t frame_idx,
user_id_t unwind_frame_index,
addr_t cfa,
bool cfa_is_valid,
addr_t pc,
uint32_t stop_id,
bool stop_id_is_valid,
bool is_history_frame,
const SymbolContext *sc_ptr) :
m_thread_wp (thread_sp),
m_frame_index (frame_idx),
m_concrete_frame_index (unwind_frame_index),
m_reg_context_sp (),
m_id (pc, cfa, NULL),
m_frame_code_addr (pc),
m_sc (),
m_flags (),
m_frame_base (),
m_frame_base_error (),
m_cfa_is_valid (cfa_is_valid),
m_stop_id (stop_id),
m_stop_id_is_valid (stop_id_is_valid),
m_is_history_frame (is_history_frame),
m_variable_list_sp (),
m_variable_list_value_objects (),
m_disassembly ()
{
// If we don't have a CFA value, use the frame index for our StackID so that recursive
// functions properly aren't confused with one another on a history stack.
if (m_is_history_frame && m_cfa_is_valid == false)
{
m_id.SetCFA (m_frame_index);
}
if (sc_ptr != NULL)
{
m_sc = *sc_ptr;
m_flags.Set(m_sc.GetResolvedMask ());
}
}
StackFrame::StackFrame (const ThreadSP &thread_sp,
user_id_t frame_idx,
user_id_t unwind_frame_index,
const RegisterContextSP &reg_context_sp,
addr_t cfa,
addr_t pc,
const SymbolContext *sc_ptr) :
m_thread_wp (thread_sp),
m_frame_index (frame_idx),
m_concrete_frame_index (unwind_frame_index),
m_reg_context_sp (reg_context_sp),
m_id (pc, cfa, NULL),
m_frame_code_addr (pc),
m_sc (),
m_flags (),
m_frame_base (),
m_frame_base_error (),
m_cfa_is_valid (true),
m_stop_id (0),
m_stop_id_is_valid (false),
m_is_history_frame (false),
m_variable_list_sp (),
m_variable_list_value_objects (),
m_disassembly ()
{
if (sc_ptr != NULL)
{
m_sc = *sc_ptr;
m_flags.Set(m_sc.GetResolvedMask ());
}
if (reg_context_sp && !m_sc.target_sp)
{
m_sc.target_sp = reg_context_sp->CalculateTarget();
if (m_sc.target_sp)
m_flags.Set (eSymbolContextTarget);
}
}
StackFrame::StackFrame (const ThreadSP &thread_sp,
user_id_t frame_idx,
user_id_t unwind_frame_index,
const RegisterContextSP &reg_context_sp,
addr_t cfa,
const Address& pc_addr,
const SymbolContext *sc_ptr) :
m_thread_wp (thread_sp),
m_frame_index (frame_idx),
m_concrete_frame_index (unwind_frame_index),
m_reg_context_sp (reg_context_sp),
m_id (pc_addr.GetLoadAddress (thread_sp->CalculateTarget().get()), cfa, NULL),
m_frame_code_addr (pc_addr),
m_sc (),
m_flags (),
m_frame_base (),
m_frame_base_error (),
m_cfa_is_valid (true),
m_stop_id (0),
m_stop_id_is_valid (false),
m_is_history_frame (false),
m_variable_list_sp (),
m_variable_list_value_objects (),
m_disassembly ()
{
if (sc_ptr != NULL)
{
m_sc = *sc_ptr;
m_flags.Set(m_sc.GetResolvedMask ());
}
if (m_sc.target_sp.get() == NULL && reg_context_sp)
{
m_sc.target_sp = reg_context_sp->CalculateTarget();
if (m_sc.target_sp)
m_flags.Set (eSymbolContextTarget);
}
ModuleSP pc_module_sp (pc_addr.GetModule());
if (!m_sc.module_sp || m_sc.module_sp != pc_module_sp)
{
if (pc_module_sp)
{
m_sc.module_sp = pc_module_sp;
m_flags.Set (eSymbolContextModule);
}
else
{
m_sc.module_sp.reset();
}
}
}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
StackFrame::~StackFrame()
{
}
StackID&
StackFrame::GetStackID()
{
// Make sure we have resolved the StackID object's symbol context scope if
// we already haven't looked it up.
if (m_flags.IsClear (RESOLVED_FRAME_ID_SYMBOL_SCOPE))
{
if (m_id.GetSymbolContextScope ())
{
// We already have a symbol context scope, we just don't have our
// flag bit set.
m_flags.Set (RESOLVED_FRAME_ID_SYMBOL_SCOPE);
}
else
{
// Calculate the frame block and use this for the stack ID symbol
// context scope if we have one.
SymbolContextScope *scope = GetFrameBlock ();
if (scope == NULL)
{
// We don't have a block, so use the symbol
if (m_flags.IsClear (eSymbolContextSymbol))
GetSymbolContext (eSymbolContextSymbol);
// It is ok if m_sc.symbol is NULL here
scope = m_sc.symbol;
}
// Set the symbol context scope (the accessor will set the
// RESOLVED_FRAME_ID_SYMBOL_SCOPE bit in m_flags).
SetSymbolContextScope (scope);
}
}
return m_id;
}
uint32_t
StackFrame::GetFrameIndex () const
{
ThreadSP thread_sp = GetThread();
if (thread_sp)
return thread_sp->GetStackFrameList()->GetVisibleStackFrameIndex(m_frame_index);
else
return m_frame_index;
}
void
StackFrame::SetSymbolContextScope (SymbolContextScope *symbol_scope)
{
m_flags.Set (RESOLVED_FRAME_ID_SYMBOL_SCOPE);
m_id.SetSymbolContextScope (symbol_scope);
}
const Address&
StackFrame::GetFrameCodeAddress()
{
if (m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR) && !m_frame_code_addr.IsSectionOffset())
{
m_flags.Set (RESOLVED_FRAME_CODE_ADDR);
// Resolve the PC into a temporary address because if ResolveLoadAddress
// fails to resolve the address, it will clear the address object...
ThreadSP thread_sp (GetThread());
if (thread_sp)
{
TargetSP target_sp (thread_sp->CalculateTarget());
if (target_sp)
{
if (m_frame_code_addr.SetOpcodeLoadAddress (m_frame_code_addr.GetOffset(), target_sp.get()))
{
ModuleSP module_sp (m_frame_code_addr.GetModule());
if (module_sp)
{
m_sc.module_sp = module_sp;
m_flags.Set(eSymbolContextModule);
}
}
}
}
}
return m_frame_code_addr;
}
bool
StackFrame::ChangePC (addr_t pc)
{
// We can't change the pc value of a history stack frame - it is immutable.
if (m_is_history_frame)
return false;
m_frame_code_addr.SetRawAddress(pc);
m_sc.Clear(false);
m_flags.Reset(0);
ThreadSP thread_sp (GetThread());
if (thread_sp)
thread_sp->ClearStackFrames ();
return true;
}
const char *
StackFrame::Disassemble ()
{
if (m_disassembly.GetSize() == 0)
{
ExecutionContext exe_ctx (shared_from_this());
Target *target = exe_ctx.GetTargetPtr();
if (target)
{
const char *plugin_name = NULL;
const char *flavor = NULL;
Disassembler::Disassemble (target->GetDebugger(),
target->GetArchitecture(),
plugin_name,
flavor,
exe_ctx,
0,
0,
0,
m_disassembly);
}
if (m_disassembly.GetSize() == 0)
return NULL;
}
return m_disassembly.GetData();
}
Block *
StackFrame::GetFrameBlock ()
{
if (m_sc.block == NULL && m_flags.IsClear (eSymbolContextBlock))
GetSymbolContext (eSymbolContextBlock);
if (m_sc.block)
{
Block *inline_block = m_sc.block->GetContainingInlinedBlock();
if (inline_block)
{
// Use the block with the inlined function info
// as the frame block we want this frame to have only the variables
// for the inlined function and its non-inlined block child blocks.
return inline_block;
}
else
{
// This block is not contained withing any inlined function blocks
// with so we want to use the top most function block.
return &m_sc.function->GetBlock (false);
}
}
return NULL;
}
//----------------------------------------------------------------------
// Get the symbol context if we already haven't done so by resolving the
// PC address as much as possible. This way when we pass around a
// StackFrame object, everyone will have as much information as
// possible and no one will ever have to look things up manually.
//----------------------------------------------------------------------
const SymbolContext&
StackFrame::GetSymbolContext (uint32_t resolve_scope)
{
// Copy our internal symbol context into "sc".
if ((m_flags.Get() & resolve_scope) != resolve_scope)
{
uint32_t resolved = 0;
// If the target was requested add that:
if (!m_sc.target_sp)
{
m_sc.target_sp = CalculateTarget();
if (m_sc.target_sp)
resolved |= eSymbolContextTarget;
}
// Resolve our PC to section offset if we haven't alreday done so
// and if we don't have a module. The resolved address section will
// contain the module to which it belongs
if (!m_sc.module_sp && m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR))
GetFrameCodeAddress();
// If this is not frame zero, then we need to subtract 1 from the PC
// value when doing address lookups since the PC will be on the
// instruction following the function call instruction...
Address lookup_addr(GetFrameCodeAddress());
if (m_frame_index > 0 && lookup_addr.IsValid())
{
addr_t offset = lookup_addr.GetOffset();
if (offset > 0)
lookup_addr.SetOffset(offset - 1);
}
if (m_sc.module_sp)
{
// We have something in our stack frame symbol context, lets check
// if we haven't already tried to lookup one of those things. If we
// haven't then we will do the query.
uint32_t actual_resolve_scope = 0;
if (resolve_scope & eSymbolContextCompUnit)
{
if (m_flags.IsClear (eSymbolContextCompUnit))
{
if (m_sc.comp_unit)
resolved |= eSymbolContextCompUnit;
else
actual_resolve_scope |= eSymbolContextCompUnit;
}
}
if (resolve_scope & eSymbolContextFunction)
{
if (m_flags.IsClear (eSymbolContextFunction))
{
if (m_sc.function)
resolved |= eSymbolContextFunction;
else
actual_resolve_scope |= eSymbolContextFunction;
}
}
if (resolve_scope & eSymbolContextBlock)
{
if (m_flags.IsClear (eSymbolContextBlock))
{
if (m_sc.block)
resolved |= eSymbolContextBlock;
else
actual_resolve_scope |= eSymbolContextBlock;
}
}
if (resolve_scope & eSymbolContextSymbol)
{
if (m_flags.IsClear (eSymbolContextSymbol))
{
if (m_sc.symbol)
resolved |= eSymbolContextSymbol;
else
actual_resolve_scope |= eSymbolContextSymbol;
}
}
if (resolve_scope & eSymbolContextLineEntry)
{
if (m_flags.IsClear (eSymbolContextLineEntry))
{
if (m_sc.line_entry.IsValid())
resolved |= eSymbolContextLineEntry;
else
actual_resolve_scope |= eSymbolContextLineEntry;
}
}
if (actual_resolve_scope)
{
// We might be resolving less information than what is already
// in our current symbol context so resolve into a temporary
// symbol context "sc" so we don't clear out data we have
// already found in "m_sc"
SymbolContext sc;
// Set flags that indicate what we have tried to resolve
resolved |= m_sc.module_sp->ResolveSymbolContextForAddress (lookup_addr, actual_resolve_scope, sc);
// Only replace what we didn't already have as we may have
// information for an inlined function scope that won't match
// what a standard lookup by address would match
if ((resolved & eSymbolContextCompUnit) && m_sc.comp_unit == NULL)
m_sc.comp_unit = sc.comp_unit;
if ((resolved & eSymbolContextFunction) && m_sc.function == NULL)
m_sc.function = sc.function;
if ((resolved & eSymbolContextBlock) && m_sc.block == NULL)
m_sc.block = sc.block;
if ((resolved & eSymbolContextSymbol) && m_sc.symbol == NULL)
m_sc.symbol = sc.symbol;
if ((resolved & eSymbolContextLineEntry) && !m_sc.line_entry.IsValid())
{
m_sc.line_entry = sc.line_entry;
if (m_sc.target_sp)
{
// Be sure to apply and file remappings to our file and line
// entries when handing out a line entry
FileSpec new_file_spec;
if (m_sc.target_sp->GetSourcePathMap().FindFile (m_sc.line_entry.file, new_file_spec))
m_sc.line_entry.file = new_file_spec;
}
}
}
}
else
{
// If we don't have a module, then we can't have the compile unit,
// function, block, line entry or symbol, so we can safely call
// ResolveSymbolContextForAddress with our symbol context member m_sc.
if (m_sc.target_sp)
{
resolved |= m_sc.target_sp->GetImages().ResolveSymbolContextForAddress (lookup_addr, resolve_scope, m_sc);
}
}
// Update our internal flags so we remember what we have tried to locate so
// we don't have to keep trying when more calls to this function are made.
// We might have dug up more information that was requested (for example
// if we were asked to only get the block, we will have gotten the
// compile unit, and function) so set any additional bits that we resolved
m_flags.Set (resolve_scope | resolved);
}
// Return the symbol context with everything that was possible to resolve
// resolved.
return m_sc;
}
VariableList *
StackFrame::GetVariableList (bool get_file_globals)
{
if (m_flags.IsClear(RESOLVED_VARIABLES))
{
m_flags.Set(RESOLVED_VARIABLES);
Block *frame_block = GetFrameBlock();
if (frame_block)
{
const bool get_child_variables = true;
const bool can_create = true;
const bool stop_if_child_block_is_inlined_function = true;
m_variable_list_sp.reset(new VariableList());
frame_block->AppendBlockVariables(can_create, get_child_variables, stop_if_child_block_is_inlined_function, m_variable_list_sp.get());
}
}
if (m_flags.IsClear(RESOLVED_GLOBAL_VARIABLES) &&
get_file_globals)
{
m_flags.Set(RESOLVED_GLOBAL_VARIABLES);
if (m_flags.IsClear (eSymbolContextCompUnit))
GetSymbolContext (eSymbolContextCompUnit);
if (m_sc.comp_unit)
{
VariableListSP global_variable_list_sp (m_sc.comp_unit->GetVariableList(true));
if (m_variable_list_sp)
m_variable_list_sp->AddVariables (global_variable_list_sp.get());
else
m_variable_list_sp = global_variable_list_sp;
}
}
return m_variable_list_sp.get();
}
VariableListSP
StackFrame::GetInScopeVariableList (bool get_file_globals)
{
// We can't fetch variable information for a history stack frame.
if (m_is_history_frame)
return VariableListSP();
VariableListSP var_list_sp(new VariableList);
GetSymbolContext (eSymbolContextCompUnit | eSymbolContextBlock);
if (m_sc.block)
{
const bool can_create = true;
const bool get_parent_variables = true;
const bool stop_if_block_is_inlined_function = true;
m_sc.block->AppendVariables (can_create,
get_parent_variables,
stop_if_block_is_inlined_function,
var_list_sp.get());
}
if (m_sc.comp_unit)
{
VariableListSP global_variable_list_sp (m_sc.comp_unit->GetVariableList(true));
if (global_variable_list_sp)
var_list_sp->AddVariables (global_variable_list_sp.get());
}
return var_list_sp;
}
ValueObjectSP
StackFrame::GetValueForVariableExpressionPath (const char *var_expr_cstr,
DynamicValueType use_dynamic,
uint32_t options,
VariableSP &var_sp,
Error &error)
{
// We can't fetch variable information for a history stack frame.
if (m_is_history_frame)
return ValueObjectSP();
if (var_expr_cstr && var_expr_cstr[0])
{
const bool check_ptr_vs_member = (options & eExpressionPathOptionCheckPtrVsMember) != 0;
const bool no_fragile_ivar = (options & eExpressionPathOptionsNoFragileObjcIvar) != 0;
const bool no_synth_child = (options & eExpressionPathOptionsNoSyntheticChildren) != 0;
//const bool no_synth_array = (options & eExpressionPathOptionsNoSyntheticArrayRange) != 0;
error.Clear();
bool deref = false;
bool address_of = false;
ValueObjectSP valobj_sp;
const bool get_file_globals = true;
// When looking up a variable for an expression, we need only consider the
// variables that are in scope.
VariableListSP var_list_sp (GetInScopeVariableList (get_file_globals));
VariableList *variable_list = var_list_sp.get();
if (variable_list)
{
// If first character is a '*', then show pointer contents
const char *var_expr = var_expr_cstr;
if (var_expr[0] == '*')
{
deref = true;
var_expr++; // Skip the '*'
}
else if (var_expr[0] == '&')
{
address_of = true;
var_expr++; // Skip the '&'
}
std::string var_path (var_expr);
size_t separator_idx = var_path.find_first_of(".-[=+~|&^%#@!/?,<>{}");
StreamString var_expr_path_strm;
ConstString name_const_string;
if (separator_idx == std::string::npos)
name_const_string.SetCString (var_path.c_str());
else
name_const_string.SetCStringWithLength (var_path.c_str(), separator_idx);
var_sp = variable_list->FindVariable(name_const_string);
bool synthetically_added_instance_object = false;
if (var_sp)
{
var_path.erase (0, name_const_string.GetLength ());
}
else if (options & eExpressionPathOptionsAllowDirectIVarAccess)
{
// Check for direct ivars access which helps us with implicit
// access to ivars with the "this->" or "self->"
GetSymbolContext(eSymbolContextFunction|eSymbolContextBlock);
lldb::LanguageType method_language = eLanguageTypeUnknown;
bool is_instance_method = false;
ConstString method_object_name;
if (m_sc.GetFunctionMethodInfo (method_language, is_instance_method, method_object_name))
{
if (is_instance_method && method_object_name)
{
var_sp = variable_list->FindVariable(method_object_name);
if (var_sp)
{
separator_idx = 0;
var_path.insert(0, "->");
synthetically_added_instance_object = true;
}
}
}
}
if (var_sp)
{
valobj_sp = GetValueObjectForFrameVariable (var_sp, use_dynamic);
if (!valobj_sp)
return valobj_sp;
// We are dumping at least one child
while (separator_idx != std::string::npos)
{
// Calculate the next separator index ahead of time
ValueObjectSP child_valobj_sp;
const char separator_type = var_path[0];
switch (separator_type)
{
case '-':
if (var_path.size() >= 2 && var_path[1] != '>')
return ValueObjectSP();
if (no_fragile_ivar)
{
// Make sure we aren't trying to deref an objective
// C ivar if this is not allowed
const uint32_t pointer_type_flags = valobj_sp->GetClangType().GetTypeInfo (NULL);
if ((pointer_type_flags & ClangASTType::eTypeIsObjC) &&
(pointer_type_flags & ClangASTType::eTypeIsPointer))
{
// This was an objective C object pointer and
// it was requested we skip any fragile ivars
// so return nothing here
return ValueObjectSP();
}
}
var_path.erase (0, 1); // Remove the '-'
// Fall through
case '.':
{
const bool expr_is_ptr = var_path[0] == '>';
var_path.erase (0, 1); // Remove the '.' or '>'
separator_idx = var_path.find_first_of(".-[");
ConstString child_name;
if (separator_idx == std::string::npos)
child_name.SetCString (var_path.c_str());
else
child_name.SetCStringWithLength(var_path.c_str(), separator_idx);
if (check_ptr_vs_member)
{
// We either have a pointer type and need to verify
// valobj_sp is a pointer, or we have a member of a
// class/union/struct being accessed with the . syntax
// and need to verify we don't have a pointer.
const bool actual_is_ptr = valobj_sp->IsPointerType ();
if (actual_is_ptr != expr_is_ptr)
{
// Incorrect use of "." with a pointer, or "->" with
// a class/union/struct instance or reference.
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
if (actual_is_ptr)
error.SetErrorStringWithFormat ("\"%s\" is a pointer and . was used to attempt to access \"%s\". Did you mean \"%s->%s\"?",
var_expr_path_strm.GetString().c_str(),
child_name.GetCString(),
var_expr_path_strm.GetString().c_str(),
var_path.c_str());
else
error.SetErrorStringWithFormat ("\"%s\" is not a pointer and -> was used to attempt to access \"%s\". Did you mean \"%s.%s\"?",
var_expr_path_strm.GetString().c_str(),
child_name.GetCString(),
var_expr_path_strm.GetString().c_str(),
var_path.c_str());
return ValueObjectSP();
}
}
child_valobj_sp = valobj_sp->GetChildMemberWithName (child_name, true);
if (!child_valobj_sp)
{
if (no_synth_child == false)
{
child_valobj_sp = valobj_sp->GetSyntheticValue();
if (child_valobj_sp)
child_valobj_sp = child_valobj_sp->GetChildMemberWithName (child_name, true);
}
if (no_synth_child || !child_valobj_sp)
{
// No child member with name "child_name"
if (synthetically_added_instance_object)
{
// We added a "this->" or "self->" to the beginning of the expression
// and this is the first pointer ivar access, so just return the normal
// error
error.SetErrorStringWithFormat("no variable or instance variable named '%s' found in this frame",
name_const_string.GetCString());
}
else
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
if (child_name)
{
error.SetErrorStringWithFormat ("\"%s\" is not a member of \"(%s) %s\"",
child_name.GetCString(),
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
else
{
error.SetErrorStringWithFormat ("incomplete expression path after \"%s\" in \"%s\"",
var_expr_path_strm.GetString().c_str(),
var_expr_cstr);
}
}
return ValueObjectSP();
}
}
synthetically_added_instance_object = false;
// Remove the child name from the path
var_path.erase(0, child_name.GetLength());
if (use_dynamic != eNoDynamicValues)
{
ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic));
if (dynamic_value_sp)
child_valobj_sp = dynamic_value_sp;
}
}
break;
case '[':
// Array member access, or treating pointer as an array
if (var_path.size() > 2) // Need at least two brackets and a number
{
char *end = NULL;
long child_index = ::strtol (&var_path[1], &end, 0);
if (end && *end == ']'
&& *(end-1) != '[') // this code forces an error in the case of arr[]. as bitfield[] is not a good syntax we're good to go
{
if (valobj_sp->GetClangType().IsPointerToScalarType() && deref)
{
// what we have is *ptr[low]. the most similar C++ syntax is to deref ptr
// and extract bit low out of it. reading array item low
// would be done by saying ptr[low], without a deref * sign
Error error;
ValueObjectSP temp(valobj_sp->Dereference(error));
if (error.Fail())
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("could not dereference \"(%s) %s\"",
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
return ValueObjectSP();
}
valobj_sp = temp;
deref = false;
}
else if (valobj_sp->GetClangType().IsArrayOfScalarType() && deref)
{
// what we have is *arr[low]. the most similar C++ syntax is to get arr[0]
// (an operation that is equivalent to deref-ing arr)
// and extract bit low out of it. reading array item low
// would be done by saying arr[low], without a deref * sign
Error error;
ValueObjectSP temp(valobj_sp->GetChildAtIndex (0, true));
if (error.Fail())
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("could not get item 0 for \"(%s) %s\"",
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
return ValueObjectSP();
}
valobj_sp = temp;
deref = false;
}
bool is_incomplete_array = false;
if (valobj_sp->IsPointerType ())
{
bool is_objc_pointer = true;
if (valobj_sp->GetClangType().GetMinimumLanguage() != eLanguageTypeObjC)
is_objc_pointer = false;
else if (!valobj_sp->GetClangType().IsPointerType())
is_objc_pointer = false;
if (no_synth_child && is_objc_pointer)
{
error.SetErrorStringWithFormat("\"(%s) %s\" is an Objective-C pointer, and cannot be subscripted",
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
return ValueObjectSP();
}
else if (is_objc_pointer)
{
// dereferencing ObjC variables is not valid.. so let's try and recur to synthetic children
ValueObjectSP synthetic = valobj_sp->GetSyntheticValue();
if (synthetic.get() == NULL /* no synthetic */
|| synthetic == valobj_sp) /* synthetic is the same as the original object */
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("\"(%s) %s\" is not an array type",
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
else if (static_cast<uint32_t>(child_index) >= synthetic->GetNumChildren() /* synthetic does not have that many values */)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("array index %ld is not valid for \"(%s) %s\"",
child_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
else
{
child_valobj_sp = synthetic->GetChildAtIndex(child_index, true);
if (!child_valobj_sp)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("array index %ld is not valid for \"(%s) %s\"",
child_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
}
}
else
{
child_valobj_sp = valobj_sp->GetSyntheticArrayMemberFromPointer (child_index, true);
if (!child_valobj_sp)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("failed to use pointer as array for index %ld for \"(%s) %s\"",
child_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
}
}
else if (valobj_sp->GetClangType().IsArrayType (NULL, NULL, &is_incomplete_array))
{
// Pass false to dynamic_value here so we can tell the difference between
// no dynamic value and no member of this type...
child_valobj_sp = valobj_sp->GetChildAtIndex (child_index, true);
if (!child_valobj_sp && (is_incomplete_array || no_synth_child == false))
child_valobj_sp = valobj_sp->GetSyntheticArrayMember (child_index, true);
if (!child_valobj_sp)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("array index %ld is not valid for \"(%s) %s\"",
child_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
}
else if (valobj_sp->GetClangType().IsScalarType())
{
// this is a bitfield asking to display just one bit
child_valobj_sp = valobj_sp->GetSyntheticBitFieldChild(child_index, child_index, true);
if (!child_valobj_sp)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("bitfield range %ld-%ld is not valid for \"(%s) %s\"",
child_index, child_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
}
else
{
ValueObjectSP synthetic = valobj_sp->GetSyntheticValue();
if (no_synth_child /* synthetic is forbidden */ ||
synthetic.get() == NULL /* no synthetic */
|| synthetic == valobj_sp) /* synthetic is the same as the original object */
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("\"(%s) %s\" is not an array type",
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
else if (static_cast<uint32_t>(child_index) >= synthetic->GetNumChildren() /* synthetic does not have that many values */)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("array index %ld is not valid for \"(%s) %s\"",
child_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
else
{
child_valobj_sp = synthetic->GetChildAtIndex(child_index, true);
if (!child_valobj_sp)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("array index %ld is not valid for \"(%s) %s\"",
child_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
}
}
if (!child_valobj_sp)
{
// Invalid array index...
return ValueObjectSP();
}
// Erase the array member specification '[%i]' where
// %i is the array index
var_path.erase(0, (end - var_path.c_str()) + 1);
separator_idx = var_path.find_first_of(".-[");
if (use_dynamic != eNoDynamicValues)
{
ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic));
if (dynamic_value_sp)
child_valobj_sp = dynamic_value_sp;
}
// Break out early from the switch since we were
// able to find the child member
break;
}
else if (end && *end == '-')
{
// this is most probably a BitField, let's take a look
char *real_end = NULL;
long final_index = ::strtol (end+1, &real_end, 0);
bool expand_bitfield = true;
if (real_end && *real_end == ']')
{
// if the format given is [high-low], swap range
if (child_index > final_index)
{
long temp = child_index;
child_index = final_index;
final_index = temp;
}
if (valobj_sp->GetClangType().IsPointerToScalarType() && deref)
{
// what we have is *ptr[low-high]. the most similar C++ syntax is to deref ptr
// and extract bits low thru high out of it. reading array items low thru high
// would be done by saying ptr[low-high], without a deref * sign
Error error;
ValueObjectSP temp(valobj_sp->Dereference(error));
if (error.Fail())
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("could not dereference \"(%s) %s\"",
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
return ValueObjectSP();
}
valobj_sp = temp;
deref = false;
}
else if (valobj_sp->GetClangType().IsArrayOfScalarType() && deref)
{
// what we have is *arr[low-high]. the most similar C++ syntax is to get arr[0]
// (an operation that is equivalent to deref-ing arr)
// and extract bits low thru high out of it. reading array items low thru high
// would be done by saying arr[low-high], without a deref * sign
Error error;
ValueObjectSP temp(valobj_sp->GetChildAtIndex (0, true));
if (error.Fail())
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("could not get item 0 for \"(%s) %s\"",
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
return ValueObjectSP();
}
valobj_sp = temp;
deref = false;
}
/*else if (valobj_sp->IsArrayType() || valobj_sp->IsPointerType())
{
child_valobj_sp = valobj_sp->GetSyntheticArrayRangeChild(child_index, final_index, true);
expand_bitfield = false;
if (!child_valobj_sp)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("array range %i-%i is not valid for \"(%s) %s\"",
child_index, final_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
}*/
if (expand_bitfield)
{
child_valobj_sp = valobj_sp->GetSyntheticBitFieldChild(child_index, final_index, true);
if (!child_valobj_sp)
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("bitfield range %ld-%ld is not valid for \"(%s) %s\"",
child_index, final_index,
valobj_sp->GetTypeName().AsCString("<invalid type>"),
var_expr_path_strm.GetString().c_str());
}
}
}
if (!child_valobj_sp)
{
// Invalid bitfield range...
return ValueObjectSP();
}
// Erase the bitfield member specification '[%i-%i]' where
// %i is the index
var_path.erase(0, (real_end - var_path.c_str()) + 1);
separator_idx = var_path.find_first_of(".-[");
if (use_dynamic != eNoDynamicValues)
{
ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic));
if (dynamic_value_sp)
child_valobj_sp = dynamic_value_sp;
}
// Break out early from the switch since we were
// able to find the child member
break;
}
}
else
{
error.SetErrorStringWithFormat("invalid square bracket encountered after \"%s\" in \"%s\"",
var_expr_path_strm.GetString().c_str(),
var_path.c_str());
}
return ValueObjectSP();
default:
// Failure...
{
valobj_sp->GetExpressionPath (var_expr_path_strm, false);
error.SetErrorStringWithFormat ("unexpected char '%c' encountered after \"%s\" in \"%s\"",
separator_type,
var_expr_path_strm.GetString().c_str(),
var_path.c_str());
return ValueObjectSP();
}
}
if (child_valobj_sp)
valobj_sp = child_valobj_sp;
if (var_path.empty())
break;
}
if (valobj_sp)
{
if (deref)
{
ValueObjectSP deref_valobj_sp (valobj_sp->Dereference(error));
valobj_sp = deref_valobj_sp;
}
else if (address_of)
{
ValueObjectSP address_of_valobj_sp (valobj_sp->AddressOf(error));
valobj_sp = address_of_valobj_sp;
}
}
return valobj_sp;
}
else
{
error.SetErrorStringWithFormat("no variable named '%s' found in this frame",
name_const_string.GetCString());
}
}
}
else
{
error.SetErrorStringWithFormat("invalid variable path '%s'", var_expr_cstr);
}
return ValueObjectSP();
}
bool
StackFrame::GetFrameBaseValue (Scalar &frame_base, Error *error_ptr)
{
if (m_cfa_is_valid == false)
{
m_frame_base_error.SetErrorString("No frame base available for this historical stack frame.");
return false;
}
if (m_flags.IsClear(GOT_FRAME_BASE))
{
if (m_sc.function)
{
m_frame_base.Clear();
m_frame_base_error.Clear();
m_flags.Set(GOT_FRAME_BASE);
ExecutionContext exe_ctx (shared_from_this());
Value expr_value;
addr_t loclist_base_addr = LLDB_INVALID_ADDRESS;
if (m_sc.function->GetFrameBaseExpression().IsLocationList())
loclist_base_addr = m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress (exe_ctx.GetTargetPtr());
if (m_sc.function->GetFrameBaseExpression().Evaluate(&exe_ctx, NULL, NULL, NULL, loclist_base_addr, NULL, expr_value, &m_frame_base_error) == false)
{
// We should really have an error if evaluate returns, but in case
// we don't, lets set the error to something at least.
if (m_frame_base_error.Success())
m_frame_base_error.SetErrorString("Evaluation of the frame base expression failed.");
}
else
{
m_frame_base = expr_value.ResolveValue(&exe_ctx);
}
}
else
{
m_frame_base_error.SetErrorString ("No function in symbol context.");
}
}
if (m_frame_base_error.Success())
frame_base = m_frame_base;
if (error_ptr)
*error_ptr = m_frame_base_error;
return m_frame_base_error.Success();
}
RegisterContextSP
StackFrame::GetRegisterContext ()
{
if (!m_reg_context_sp)
{
ThreadSP thread_sp (GetThread());
if (thread_sp)
m_reg_context_sp = thread_sp->CreateRegisterContextForFrame (this);
}
return m_reg_context_sp;
}
bool
StackFrame::HasDebugInformation ()
{
GetSymbolContext (eSymbolContextLineEntry);
return m_sc.line_entry.IsValid();
}
ValueObjectSP
StackFrame::GetValueObjectForFrameVariable (const VariableSP &variable_sp, DynamicValueType use_dynamic)
{
ValueObjectSP valobj_sp;
if (m_is_history_frame)
{
return valobj_sp;
}
VariableList *var_list = GetVariableList (true);
if (var_list)
{
// Make sure the variable is a frame variable
const uint32_t var_idx = var_list->FindIndexForVariable (variable_sp.get());
const uint32_t num_variables = var_list->GetSize();
if (var_idx < num_variables)
{
valobj_sp = m_variable_list_value_objects.GetValueObjectAtIndex (var_idx);
if (valobj_sp.get() == NULL)
{
if (m_variable_list_value_objects.GetSize() < num_variables)
m_variable_list_value_objects.Resize(num_variables);
valobj_sp = ValueObjectVariable::Create (this, variable_sp);
m_variable_list_value_objects.SetValueObjectAtIndex (var_idx, valobj_sp);
}
}
}
if (use_dynamic != eNoDynamicValues && valobj_sp)
{
ValueObjectSP dynamic_sp = valobj_sp->GetDynamicValue (use_dynamic);
if (dynamic_sp)
return dynamic_sp;
}
return valobj_sp;
}
ValueObjectSP
StackFrame::TrackGlobalVariable (const VariableSP &variable_sp, DynamicValueType use_dynamic)
{
if (m_is_history_frame)
return ValueObjectSP();
// Check to make sure we aren't already tracking this variable?
ValueObjectSP valobj_sp (GetValueObjectForFrameVariable (variable_sp, use_dynamic));
if (!valobj_sp)
{
// We aren't already tracking this global
VariableList *var_list = GetVariableList (true);
// If this frame has no variables, create a new list
if (var_list == NULL)
m_variable_list_sp.reset (new VariableList());
// Add the global/static variable to this frame
m_variable_list_sp->AddVariable (variable_sp);
// Now make a value object for it so we can track its changes
valobj_sp = GetValueObjectForFrameVariable (variable_sp, use_dynamic);
}
return valobj_sp;
}
bool
StackFrame::IsInlined ()
{
if (m_sc.block == NULL)
GetSymbolContext (eSymbolContextBlock);
if (m_sc.block)
return m_sc.block->GetContainingInlinedBlock() != NULL;
return false;
}
TargetSP
StackFrame::CalculateTarget ()
{
TargetSP target_sp;
ThreadSP thread_sp(GetThread());
if (thread_sp)
{
ProcessSP process_sp (thread_sp->CalculateProcess());
if (process_sp)
target_sp = process_sp->CalculateTarget();
}
return target_sp;
}
ProcessSP
StackFrame::CalculateProcess ()
{
ProcessSP process_sp;
ThreadSP thread_sp(GetThread());
if (thread_sp)
process_sp = thread_sp->CalculateProcess();
return process_sp;
}
ThreadSP
StackFrame::CalculateThread ()
{
return GetThread();
}
StackFrameSP
StackFrame::CalculateStackFrame ()
{
return shared_from_this();
}
void
StackFrame::CalculateExecutionContext (ExecutionContext &exe_ctx)
{
exe_ctx.SetContext (shared_from_this());
}
void
StackFrame::DumpUsingSettingsFormat (Stream *strm, const char *frame_marker)
{
if (strm == NULL)
return;
GetSymbolContext(eSymbolContextEverything);
ExecutionContext exe_ctx (shared_from_this());
StreamString s;
if (frame_marker)
s.PutCString(frame_marker);
const char *frame_format = NULL;
Target *target = exe_ctx.GetTargetPtr();
if (target)
frame_format = target->GetDebugger().GetFrameFormat();
if (frame_format && Debugger::FormatPrompt (frame_format, &m_sc, &exe_ctx, NULL, s))
{
strm->Write(s.GetData(), s.GetSize());
}
else
{
Dump (strm, true, false);
strm->EOL();
}
}
void
StackFrame::Dump (Stream *strm, bool show_frame_index, bool show_fullpaths)
{
if (strm == NULL)
return;
if (show_frame_index)
strm->Printf("frame #%u: ", m_frame_index);
ExecutionContext exe_ctx (shared_from_this());
Target *target = exe_ctx.GetTargetPtr();
strm->Printf("0x%0*" PRIx64 " ",
target ? (target->GetArchitecture().GetAddressByteSize() * 2) : 16,
GetFrameCodeAddress().GetLoadAddress(target));
GetSymbolContext(eSymbolContextEverything);
const bool show_module = true;
const bool show_inline = true;
m_sc.DumpStopContext (strm,
exe_ctx.GetBestExecutionContextScope(),
GetFrameCodeAddress(),
show_fullpaths,
show_module,
show_inline);
}
void
StackFrame::UpdateCurrentFrameFromPreviousFrame (StackFrame &prev_frame)
{
assert (GetStackID() == prev_frame.GetStackID()); // TODO: remove this after some testing
m_variable_list_sp = prev_frame.m_variable_list_sp;
m_variable_list_value_objects.Swap (prev_frame.m_variable_list_value_objects);
if (!m_disassembly.GetString().empty())
m_disassembly.GetString().swap (m_disassembly.GetString());
}
void
StackFrame::UpdatePreviousFrameFromCurrentFrame (StackFrame &curr_frame)
{
assert (GetStackID() == curr_frame.GetStackID()); // TODO: remove this after some testing
m_id.SetPC (curr_frame.m_id.GetPC()); // Update the Stack ID PC value
assert (GetThread() == curr_frame.GetThread());
m_frame_index = curr_frame.m_frame_index;
m_concrete_frame_index = curr_frame.m_concrete_frame_index;
m_reg_context_sp = curr_frame.m_reg_context_sp;
m_frame_code_addr = curr_frame.m_frame_code_addr;
assert (m_sc.target_sp.get() == NULL || curr_frame.m_sc.target_sp.get() == NULL || m_sc.target_sp.get() == curr_frame.m_sc.target_sp.get());
assert (m_sc.module_sp.get() == NULL || curr_frame.m_sc.module_sp.get() == NULL || m_sc.module_sp.get() == curr_frame.m_sc.module_sp.get());
assert (m_sc.comp_unit == NULL || curr_frame.m_sc.comp_unit == NULL || m_sc.comp_unit == curr_frame.m_sc.comp_unit);
assert (m_sc.function == NULL || curr_frame.m_sc.function == NULL || m_sc.function == curr_frame.m_sc.function);
m_sc = curr_frame.m_sc;
m_flags.Clear(GOT_FRAME_BASE | eSymbolContextEverything);
m_flags.Set (m_sc.GetResolvedMask());
m_frame_base.Clear();
m_frame_base_error.Clear();
}
bool
StackFrame::HasCachedData () const
{
if (m_variable_list_sp.get())
return true;
if (m_variable_list_value_objects.GetSize() > 0)
return true;
if (!m_disassembly.GetString().empty())
return true;
return false;
}
bool
StackFrame::GetStatus (Stream& strm,
bool show_frame_info,
bool show_source,
const char *frame_marker)
{
if (show_frame_info)
{
strm.Indent();
DumpUsingSettingsFormat (&strm, frame_marker);
}
if (show_source)
{
ExecutionContext exe_ctx (shared_from_this());
bool have_source = false;
Debugger::StopDisassemblyType disasm_display = Debugger::eStopDisassemblyTypeNever;
Target *target = exe_ctx.GetTargetPtr();
if (target)
{
Debugger &debugger = target->GetDebugger();
const uint32_t source_lines_before = debugger.GetStopSourceLineCount(true);
const uint32_t source_lines_after = debugger.GetStopSourceLineCount(false);
disasm_display = debugger.GetStopDisassemblyDisplay ();
if (source_lines_before > 0 || source_lines_after > 0)
{
GetSymbolContext(eSymbolContextCompUnit | eSymbolContextLineEntry);
if (m_sc.comp_unit && m_sc.line_entry.IsValid())
{
have_source = true;
target->GetSourceManager().DisplaySourceLinesWithLineNumbers (m_sc.line_entry.file,
m_sc.line_entry.line,
source_lines_before,
source_lines_after,
"->",
&strm);
}
}
switch (disasm_display)
{
case Debugger::eStopDisassemblyTypeNever:
break;
case Debugger::eStopDisassemblyTypeNoSource:
if (have_source)
break;
// Fall through to next case
case Debugger::eStopDisassemblyTypeAlways:
if (target)
{
const uint32_t disasm_lines = debugger.GetDisassemblyLineCount();
if (disasm_lines > 0)
{
const ArchSpec &target_arch = target->GetArchitecture();
AddressRange pc_range;
pc_range.GetBaseAddress() = GetFrameCodeAddress();
pc_range.SetByteSize(disasm_lines * target_arch.GetMaximumOpcodeByteSize());
const char *plugin_name = NULL;
const char *flavor = NULL;
Disassembler::Disassemble (target->GetDebugger(),
target_arch,
plugin_name,
flavor,
exe_ctx,
pc_range,
disasm_lines,
0,
Disassembler::eOptionMarkPCAddress,
strm);
}
}
break;
}
}
}
return true;
}
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