016a95eb04
debug map showed that the location lists in the .o files needed some refactoring in order to work. The case that was failing was where a function that was in the "__TEXT.__textcoal_nt" in the .o file, and in the "__TEXT.__text" section in the main executable. This made symbol lookup fail due to the way we were finding a real address in the debug map which was by finding the section that the function was in in the .o file and trying to find this in the main executable. Now the section list supports finding a linked address in a section or any child sections. After fixing this, we ran into issue that were due to DWARF and how it represents locations lists. DWARF makes a list of address ranges and expressions that go along with those address ranges. The location addresses are expressed in terms of a compile unit address + offset. This works fine as long as nothing moves around. When stuff moves around and offsets change between the remapped compile unit base address and the new function address, then we can run into trouble. To deal with this, we now store supply a location list slide amount to any location list expressions that will allow us to make the location list addresses into zero based offsets from the object that owns the location list (always a function in our case). With these fixes we can now re-link random address ranges inside the debugger for use with our DWARF + debug map, incremental linking, and more. Another issue that arose when doing the DWARF in the .o files was that GCC 4.2 emits a ".debug_aranges" that only mentions functions that are externally visible. This makes .debug_aranges useless to us and we now generate a real address range lookup table in the DWARF parser at the same time as we index the name tables (that are needed because .debug_pubnames is just as useless). llvm-gcc doesn't generate a .debug_aranges section, though this could be fixed, we aren't going to rely upon it. Renamed a bunch of "UINT_MAX" to "UINT32_MAX". llvm-svn: 113829
682 lines
22 KiB
C++
682 lines
22 KiB
C++
//===-- StackFrame.cpp ------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Target/StackFrame.h"
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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Core/Module.h"
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#include "lldb/Core/Disassembler.h"
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#include "lldb/Core/Value.h"
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#include "lldb/Core/ValueObjectVariable.h"
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#include "lldb/Symbol/Function.h"
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#include "lldb/Symbol/VariableList.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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using namespace lldb;
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using namespace lldb_private;
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// The first bits in the flags are reserved for the SymbolContext::Scope bits
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// so we know if we have tried to look up information in our internal symbol
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// context (m_sc) already.
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#define RESOLVED_FRAME_CODE_ADDR (uint32_t(eSymbolContextEverything + 1))
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#define RESOLVED_FRAME_ID_SYMBOL_SCOPE (RESOLVED_FRAME_CODE_ADDR << 1)
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#define GOT_FRAME_BASE (RESOLVED_FRAME_ID_SYMBOL_SCOPE << 1)
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#define RESOLVED_VARIABLES (GOT_FRAME_BASE << 1)
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StackFrame::StackFrame
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(
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lldb::user_id_t frame_idx,
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lldb::user_id_t unwind_frame_index,
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Thread &thread,
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lldb::addr_t cfa,
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lldb::addr_t pc,
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const SymbolContext *sc_ptr
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) :
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m_frame_index (frame_idx),
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m_unwind_frame_index (unwind_frame_index),
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m_thread (thread),
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m_reg_context_sp (),
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m_id (pc, cfa, NULL),
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m_frame_code_addr (NULL, pc),
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m_sc (),
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m_flags (),
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m_frame_base (),
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m_frame_base_error (),
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m_variable_list_sp (),
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m_variable_list_value_objects ()
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{
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if (sc_ptr != NULL)
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{
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m_sc = *sc_ptr;
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m_flags.Set(m_sc.GetResolvedMask ());
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}
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}
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StackFrame::StackFrame
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(
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lldb::user_id_t frame_idx,
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lldb::user_id_t unwind_frame_index,
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Thread &thread,
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const RegisterContextSP ®_context_sp,
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lldb::addr_t cfa,
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lldb::addr_t pc,
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const SymbolContext *sc_ptr
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) :
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m_frame_index (frame_idx),
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m_unwind_frame_index (unwind_frame_index),
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m_thread (thread),
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m_reg_context_sp (reg_context_sp),
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m_id (pc, cfa, NULL),
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m_frame_code_addr (NULL, pc),
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m_sc (),
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m_flags (),
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m_frame_base (),
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m_frame_base_error (),
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m_variable_list_sp (),
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m_variable_list_value_objects ()
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{
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if (sc_ptr != NULL)
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{
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m_sc = *sc_ptr;
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m_flags.Set(m_sc.GetResolvedMask ());
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}
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if (reg_context_sp && !m_sc.target_sp)
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{
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m_sc.target_sp = reg_context_sp->GetThread().GetProcess().GetTarget().GetSP();
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m_flags.Set (eSymbolContextTarget);
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}
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}
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StackFrame::StackFrame
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(
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lldb::user_id_t frame_idx,
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lldb::user_id_t unwind_frame_index,
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Thread &thread,
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const RegisterContextSP ®_context_sp,
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lldb::addr_t cfa,
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const Address& pc_addr,
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const SymbolContext *sc_ptr
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) :
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m_frame_index (frame_idx),
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m_unwind_frame_index (unwind_frame_index),
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m_thread (thread),
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m_reg_context_sp (reg_context_sp),
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m_id (pc_addr.GetLoadAddress (&thread.GetProcess()), cfa, NULL),
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m_frame_code_addr (pc_addr),
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m_sc (),
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m_flags (),
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m_frame_base (),
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m_frame_base_error (),
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m_variable_list_sp (),
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m_variable_list_value_objects ()
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{
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if (sc_ptr != NULL)
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{
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m_sc = *sc_ptr;
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m_flags.Set(m_sc.GetResolvedMask ());
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}
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if (m_sc.target_sp.get() == NULL && reg_context_sp)
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{
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m_sc.target_sp = reg_context_sp->GetThread().GetProcess().GetTarget().GetSP();
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m_flags.Set (eSymbolContextTarget);
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}
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Module *pc_module = pc_addr.GetModule();
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if (m_sc.module_sp.get() == NULL || m_sc.module_sp.get() != pc_module)
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{
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if (pc_module)
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{
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m_sc.module_sp = pc_module->GetSP();
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m_flags.Set (eSymbolContextModule);
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}
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else
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{
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m_sc.module_sp.reset();
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}
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}
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}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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StackFrame::~StackFrame()
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{
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}
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StackID&
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StackFrame::GetStackID()
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{
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// Make sure we have resolved the StackID object's symbol context scope if
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// we already haven't looked it up.
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if (m_flags.IsClear (RESOLVED_FRAME_ID_SYMBOL_SCOPE))
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{
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if (m_id.GetSymbolContextScope ())
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{
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// We already have a symbol context scope, we just don't have our
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// flag bit set.
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m_flags.Set (RESOLVED_FRAME_ID_SYMBOL_SCOPE);
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}
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else
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{
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// Calculate the frame block and use this for the stack ID symbol
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// context scope if we have one.
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SymbolContextScope *scope = GetFrameBlock ();
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if (scope == NULL)
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{
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// We don't have a block, so use the symbol
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if (m_flags.IsClear (eSymbolContextSymbol))
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GetSymbolContext (eSymbolContextSymbol);
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// It is ok if m_sc.symbol is NULL here
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scope = m_sc.symbol;
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}
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// Set the symbol context scope (the accessor will set the
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// RESOLVED_FRAME_ID_SYMBOL_SCOPE bit in m_flags).
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SetSymbolContextScope (scope);
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}
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}
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return m_id;
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}
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void
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StackFrame::SetSymbolContextScope (SymbolContextScope *symbol_scope)
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{
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m_flags.Set (RESOLVED_FRAME_ID_SYMBOL_SCOPE);
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m_id.SetSymbolContextScope (symbol_scope);
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}
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Address&
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StackFrame::GetFrameCodeAddress()
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{
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if (m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR) && !m_frame_code_addr.IsSectionOffset())
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{
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m_flags.Set (RESOLVED_FRAME_CODE_ADDR);
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// Resolve the PC into a temporary address because if ResolveLoadAddress
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// fails to resolve the address, it will clear the address object...
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Address resolved_pc;
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if (m_thread.GetProcess().ResolveLoadAddress(m_frame_code_addr.GetOffset(), resolved_pc))
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{
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m_frame_code_addr = resolved_pc;
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const Section *section = m_frame_code_addr.GetSection();
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if (section)
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{
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Module *module = section->GetModule();
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if (module)
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{
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m_sc.module_sp = module->GetSP();
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if (m_sc.module_sp)
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m_flags.Set(eSymbolContextModule);
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}
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}
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}
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}
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return m_frame_code_addr;
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}
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void
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StackFrame::ChangePC (addr_t pc)
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{
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m_frame_code_addr.SetOffset(pc);
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m_frame_code_addr.SetSection(NULL);
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m_sc.Clear();
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m_flags.SetAllFlagBits(0);
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m_thread.ClearStackFrames ();
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}
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const char *
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StackFrame::Disassemble ()
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{
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if (m_disassembly.GetSize() == 0)
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{
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ExecutionContext exe_ctx;
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Calculate(exe_ctx);
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Target &target = m_thread.GetProcess().GetTarget();
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Disassembler::Disassemble (target.GetDebugger(),
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target.GetArchitecture(),
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exe_ctx,
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0,
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false,
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m_disassembly);
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if (m_disassembly.GetSize() == 0)
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return NULL;
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}
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return m_disassembly.GetData();
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}
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Block *
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StackFrame::GetFrameBlock ()
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{
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if (m_sc.block == NULL && m_flags.IsClear (eSymbolContextBlock))
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GetSymbolContext (eSymbolContextBlock);
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if (m_sc.block)
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{
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Block *inline_block = m_sc.block->GetContainingInlinedBlock();
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if (inline_block)
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{
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// Use the block with the inlined function info
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// as the frame block we want this frame to have only the variables
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// for the inlined function and its non-inlined block child blocks.
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return inline_block;
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}
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else
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{
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// This block is not contained withing any inlined function blocks
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// with so we want to use the top most function block.
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return &m_sc.function->GetBlock (false);
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}
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}
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return NULL;
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}
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//----------------------------------------------------------------------
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// Get the symbol context if we already haven't done so by resolving the
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// PC address as much as possible. This way when we pass around a
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// StackFrame object, everyone will have as much information as
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// possible and no one will ever have to look things up manually.
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//----------------------------------------------------------------------
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const SymbolContext&
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StackFrame::GetSymbolContext (uint32_t resolve_scope)
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{
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// Copy our internal symbol context into "sc".
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if ((m_flags.GetAllFlagBits() & resolve_scope) != resolve_scope)
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{
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// Resolve our PC to section offset if we haven't alreday done so
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// and if we don't have a module. The resolved address section will
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// contain the module to which it belongs
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if (!m_sc.module_sp && m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR))
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GetFrameCodeAddress();
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// If this is not frame zero, then we need to subtract 1 from the PC
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// value when doing address lookups since the PC will be on the
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// instruction following the function call instruction...
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Address lookup_addr(GetFrameCodeAddress());
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if (m_frame_index > 0 && lookup_addr.IsValid())
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{
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addr_t offset = lookup_addr.GetOffset();
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if (offset > 0)
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lookup_addr.SetOffset(offset - 1);
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}
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uint32_t resolved = 0;
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if (m_sc.module_sp)
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{
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// We have something in our stack frame symbol context, lets check
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// if we haven't already tried to lookup one of those things. If we
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// haven't then we will do the query.
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uint32_t actual_resolve_scope = 0;
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if (resolve_scope & eSymbolContextCompUnit)
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{
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if (m_flags.IsClear (eSymbolContextCompUnit))
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{
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if (m_sc.comp_unit)
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resolved |= eSymbolContextCompUnit;
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else
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actual_resolve_scope |= eSymbolContextCompUnit;
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}
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}
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if (resolve_scope & eSymbolContextFunction)
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{
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if (m_flags.IsClear (eSymbolContextFunction))
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{
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if (m_sc.function)
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resolved |= eSymbolContextFunction;
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else
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actual_resolve_scope |= eSymbolContextFunction;
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}
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}
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if (resolve_scope & eSymbolContextBlock)
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{
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if (m_flags.IsClear (eSymbolContextBlock))
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{
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if (m_sc.block)
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resolved |= eSymbolContextBlock;
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else
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actual_resolve_scope |= eSymbolContextBlock;
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}
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}
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if (resolve_scope & eSymbolContextSymbol)
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{
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if (m_flags.IsClear (eSymbolContextSymbol))
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{
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if (m_sc.symbol)
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resolved |= eSymbolContextSymbol;
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else
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actual_resolve_scope |= eSymbolContextSymbol;
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}
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}
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if (resolve_scope & eSymbolContextLineEntry)
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{
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if (m_flags.IsClear (eSymbolContextLineEntry))
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{
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if (m_sc.line_entry.IsValid())
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resolved |= eSymbolContextLineEntry;
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else
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actual_resolve_scope |= eSymbolContextLineEntry;
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}
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}
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if (actual_resolve_scope)
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{
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// We might be resolving less information than what is already
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// in our current symbol context so resolve into a temporary
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// symbol context "sc" so we don't clear out data we have
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// already found in "m_sc"
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SymbolContext sc;
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// Set flags that indicate what we have tried to resolve
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resolved |= m_sc.module_sp->ResolveSymbolContextForAddress (lookup_addr, actual_resolve_scope, sc);
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// Only replace what we didn't already have as we may have
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// information for an inlined function scope that won't match
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// what a standard lookup by address would match
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if ((resolved & eSymbolContextCompUnit) && m_sc.comp_unit == NULL)
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m_sc.comp_unit = sc.comp_unit;
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if ((resolved & eSymbolContextFunction) && m_sc.function == NULL)
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m_sc.function = sc.function;
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if ((resolved & eSymbolContextBlock) && m_sc.block == NULL)
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m_sc.block = sc.block;
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if ((resolved & eSymbolContextSymbol) && m_sc.symbol == NULL)
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m_sc.symbol = sc.symbol;
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if ((resolved & eSymbolContextLineEntry) && !m_sc.line_entry.IsValid())
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m_sc.line_entry = sc.line_entry;
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}
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}
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else
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{
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// If we don't have a module, then we can't have the compile unit,
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// function, block, line entry or symbol, so we can safely call
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// ResolveSymbolContextForAddress with our symbol context member m_sc.
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resolved |= m_thread.GetProcess().GetTarget().GetImages().ResolveSymbolContextForAddress (lookup_addr, resolve_scope, m_sc);
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}
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// If the target was requested add that:
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if (m_sc.target_sp.get() == NULL)
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{
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m_sc.target_sp = CalculateProcess()->GetTarget().GetSP();
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if (m_sc.target_sp)
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resolved |= eSymbolContextTarget;
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}
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// Update our internal flags so we remember what we have tried to locate so
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// we don't have to keep trying when more calls to this function are made.
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// We might have dug up more information that was requested (for example
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// if we were asked to only get the block, we will have gotten the
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// compile unit, and function) so set any additional bits that we resolved
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m_flags.Set (resolve_scope | resolved);
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}
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// Return the symbol context with everything that was possible to resolve
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// resolved.
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return m_sc;
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}
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VariableList *
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StackFrame::GetVariableList (bool get_file_globals)
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{
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if (m_flags.IsClear(RESOLVED_VARIABLES))
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{
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m_flags.Set(RESOLVED_VARIABLES);
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Block *frame_block = GetFrameBlock();
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if (frame_block)
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{
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const bool get_child_variables = true;
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const bool can_create = true;
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m_variable_list_sp = frame_block->GetVariableList (get_child_variables, can_create);
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}
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if (get_file_globals)
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{
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if (m_flags.IsClear (eSymbolContextCompUnit))
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GetSymbolContext (eSymbolContextCompUnit);
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if (m_sc.comp_unit)
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{
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VariableListSP global_variable_list_sp (m_sc.comp_unit->GetVariableList(true));
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if (m_variable_list_sp)
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m_variable_list_sp->AddVariables (global_variable_list_sp.get());
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else
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m_variable_list_sp = global_variable_list_sp;
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}
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}
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}
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return m_variable_list_sp.get();
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}
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bool
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StackFrame::GetFrameBaseValue (Scalar &frame_base, Error *error_ptr)
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{
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if (m_flags.IsClear(GOT_FRAME_BASE))
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{
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if (m_sc.function)
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{
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m_frame_base.Clear();
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m_frame_base_error.Clear();
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m_flags.Set(GOT_FRAME_BASE);
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ExecutionContext exe_ctx (&m_thread.GetProcess(), &m_thread, this);
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Value expr_value;
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addr_t loclist_base_addr = LLDB_INVALID_ADDRESS;
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if (m_sc.function->GetFrameBaseExpression().IsLocationList())
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loclist_base_addr = m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress (&m_thread.GetProcess());
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if (m_sc.function->GetFrameBaseExpression().Evaluate(&exe_ctx, NULL, loclist_base_addr, NULL, expr_value, &m_frame_base_error) == false)
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{
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// We should really have an error if evaluate returns, but in case
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// 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, NULL);
|
|
}
|
|
}
|
|
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();
|
|
}
|
|
|
|
RegisterContext *
|
|
StackFrame::GetRegisterContext ()
|
|
{
|
|
if (m_reg_context_sp.get() == NULL)
|
|
m_reg_context_sp.reset (m_thread.CreateRegisterContextForFrame (this));
|
|
return m_reg_context_sp.get();
|
|
}
|
|
|
|
bool
|
|
StackFrame::HasDebugInformation ()
|
|
{
|
|
GetSymbolContext (eSymbolContextLineEntry);
|
|
return m_sc.line_entry.IsValid();
|
|
}
|
|
|
|
|
|
ValueObjectSP
|
|
StackFrame::GetValueObjectForFrameVariable (const VariableSP &variable_sp)
|
|
{
|
|
ValueObjectSP 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.reset (new ValueObjectVariable (variable_sp));
|
|
m_variable_list_value_objects.SetValueObjectAtIndex (var_idx, valobj_sp);
|
|
}
|
|
}
|
|
}
|
|
return valobj_sp;
|
|
}
|
|
|
|
ValueObjectSP
|
|
StackFrame::TrackGlobalVariable (const VariableSP &variable_sp)
|
|
{
|
|
// Check to make sure we aren't already tracking this variable?
|
|
ValueObjectSP valobj_sp (GetValueObjectForFrameVariable (variable_sp));
|
|
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);
|
|
}
|
|
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;
|
|
}
|
|
|
|
Target *
|
|
StackFrame::CalculateTarget ()
|
|
{
|
|
return m_thread.CalculateTarget();
|
|
}
|
|
|
|
Process *
|
|
StackFrame::CalculateProcess ()
|
|
{
|
|
return m_thread.CalculateProcess();
|
|
}
|
|
|
|
Thread *
|
|
StackFrame::CalculateThread ()
|
|
{
|
|
return &m_thread;
|
|
}
|
|
|
|
StackFrame *
|
|
StackFrame::CalculateStackFrame ()
|
|
{
|
|
return this;
|
|
}
|
|
|
|
|
|
void
|
|
StackFrame::Calculate (ExecutionContext &exe_ctx)
|
|
{
|
|
m_thread.Calculate (exe_ctx);
|
|
exe_ctx.frame = this;
|
|
}
|
|
|
|
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);
|
|
strm->Printf("0x%0*llx ", m_thread.GetProcess().GetAddressByteSize() * 2, GetFrameCodeAddress().GetLoadAddress(&m_thread.GetProcess()));
|
|
GetSymbolContext(eSymbolContextEverything);
|
|
const bool show_module = true;
|
|
const bool show_inline = true;
|
|
m_sc.DumpStopContext(strm, &m_thread.GetProcess(), 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 (&m_thread == &curr_frame.m_thread);
|
|
m_frame_index = curr_frame.m_frame_index;
|
|
m_unwind_frame_index = curr_frame.m_unwind_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;
|
|
} |