213 lines
7.9 KiB
C++
213 lines
7.9 KiB
C++
//===-- RegisterContextLLDB.h --------------------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef lldb_RegisterContextLLDB_h_
|
|
#define lldb_RegisterContextLLDB_h_
|
|
|
|
#include <vector>
|
|
|
|
#include "lldb/lldb-private.h"
|
|
#include "lldb/Target/RegisterContext.h"
|
|
#include "lldb/Symbol/UnwindPlan.h"
|
|
#include "lldb/Symbol/SymbolContext.h"
|
|
#include "UnwindLLDB.h"
|
|
|
|
namespace lldb_private {
|
|
|
|
class UnwindLLDB;
|
|
|
|
class RegisterContextLLDB : public lldb_private::RegisterContext
|
|
{
|
|
public:
|
|
typedef std::shared_ptr<RegisterContextLLDB> SharedPtr;
|
|
|
|
RegisterContextLLDB (lldb_private::Thread &thread,
|
|
const SharedPtr& next_frame,
|
|
lldb_private::SymbolContext& sym_ctx,
|
|
uint32_t frame_number, lldb_private::UnwindLLDB& unwind_lldb);
|
|
|
|
///
|
|
// pure virtual functions from the base class that we must implement
|
|
///
|
|
|
|
virtual
|
|
~RegisterContextLLDB () { }
|
|
|
|
virtual void
|
|
InvalidateAllRegisters ();
|
|
|
|
virtual size_t
|
|
GetRegisterCount ();
|
|
|
|
virtual const lldb_private::RegisterInfo *
|
|
GetRegisterInfoAtIndex (size_t reg);
|
|
|
|
virtual size_t
|
|
GetRegisterSetCount ();
|
|
|
|
virtual const lldb_private::RegisterSet *
|
|
GetRegisterSet (size_t reg_set);
|
|
|
|
virtual bool
|
|
ReadRegister (const lldb_private::RegisterInfo *reg_info, lldb_private::RegisterValue &value);
|
|
|
|
virtual bool
|
|
WriteRegister (const lldb_private::RegisterInfo *reg_info, const lldb_private::RegisterValue &value);
|
|
|
|
virtual bool
|
|
ReadAllRegisterValues (lldb::DataBufferSP &data_sp);
|
|
|
|
virtual bool
|
|
WriteAllRegisterValues (const lldb::DataBufferSP &data_sp);
|
|
|
|
virtual uint32_t
|
|
ConvertRegisterKindToRegisterNumber (uint32_t kind, uint32_t num);
|
|
|
|
bool
|
|
IsValid () const;
|
|
|
|
bool
|
|
GetCFA (lldb::addr_t& cfa);
|
|
|
|
bool
|
|
GetStartPC (lldb::addr_t& start_pc);
|
|
|
|
bool
|
|
ReadPC (lldb::addr_t& start_pc);
|
|
|
|
private:
|
|
|
|
enum FrameType
|
|
{
|
|
eNormalFrame,
|
|
eSigtrampFrame,
|
|
eDebuggerFrame, // a debugger inferior function call frame; we get caller's registers from debugger
|
|
eSkipFrame, // The unwind resulted in a bogus frame but may get back on track so we don't want to give up yet
|
|
eNotAValidFrame // this frame is invalid for some reason - most likely it is past the top (end) of the stack
|
|
};
|
|
|
|
// UnwindLLDB needs to pass around references to RegisterLocations
|
|
friend class UnwindLLDB;
|
|
|
|
// Indicates whether this frame is frame zero -- the currently
|
|
// executing frame -- or not.
|
|
bool
|
|
IsFrameZero () const;
|
|
|
|
void
|
|
InitializeZerothFrame ();
|
|
|
|
void
|
|
InitializeNonZerothFrame();
|
|
|
|
SharedPtr
|
|
GetNextFrame () const;
|
|
|
|
SharedPtr
|
|
GetPrevFrame () const;
|
|
|
|
// A SkipFrame occurs when the unwind out of frame 0 didn't go right -- we've got one bogus frame at frame #1.
|
|
// There is a good chance we'll get back on track if we follow the frame pointer chain (or whatever is appropriate
|
|
// on this ABI) so we allow one invalid frame to be in the stack. Ideally we'll mark this frame specially at some
|
|
// point and indicate to the user that the unwinder had a hiccup. Often when this happens we will miss a frame of
|
|
// the program's actual stack in the unwind and we want to flag that for the user somehow.
|
|
bool
|
|
IsSkipFrame () const;
|
|
|
|
// Provide a location for where THIS function saved the CALLER's register value
|
|
// Or a frame "below" this one saved it, i.e. a function called by this one, preserved a register that this
|
|
// function didn't modify/use.
|
|
//
|
|
// The RegisterLocation type may be set to eRegisterNotAvailable -- this will happen for a volatile register
|
|
// being queried mid-stack. Instead of floating frame 0's contents of that register up the stack (which may
|
|
// or may not be the value of that reg when the function was executing), we won't return any value.
|
|
//
|
|
// If a non-volatile register (a "preserved" register) is requested mid-stack and no frames "below" the requested
|
|
// stack have saved the register anywhere, it is safe to assume that frame 0's register values are still the same
|
|
// as the requesting frame's.
|
|
lldb_private::UnwindLLDB::RegisterSearchResult
|
|
SavedLocationForRegister (uint32_t lldb_regnum, lldb_private::UnwindLLDB::RegisterLocation ®loc);
|
|
|
|
bool
|
|
ReadRegisterValueFromRegisterLocation (lldb_private::UnwindLLDB::RegisterLocation regloc,
|
|
const lldb_private::RegisterInfo *reg_info,
|
|
lldb_private::RegisterValue &value);
|
|
|
|
bool
|
|
WriteRegisterValueToRegisterLocation (lldb_private::UnwindLLDB::RegisterLocation regloc,
|
|
const lldb_private::RegisterInfo *reg_info,
|
|
const lldb_private::RegisterValue &value);
|
|
|
|
void
|
|
InvalidateFullUnwindPlan ();
|
|
|
|
// Get the contents of a general purpose (address-size) register for this frame
|
|
// (usually retrieved from the next frame)
|
|
bool
|
|
ReadGPRValue (int register_kind, uint32_t regnum, lldb::addr_t &value);
|
|
|
|
lldb::UnwindPlanSP
|
|
GetFastUnwindPlanForFrame ();
|
|
|
|
lldb::UnwindPlanSP
|
|
GetFullUnwindPlanForFrame ();
|
|
|
|
void
|
|
UnwindLogMsg (const char *fmt, ...) __attribute__ ((format (printf, 2, 3)));
|
|
|
|
void
|
|
UnwindLogMsgVerbose (const char *fmt, ...) __attribute__ ((format (printf, 2, 3)));
|
|
|
|
lldb_private::Thread& m_thread;
|
|
|
|
///
|
|
// The following tell us how to retrieve the CALLER's register values (ie the "previous" frame, aka the frame above)
|
|
// i.e. where THIS frame saved them
|
|
///
|
|
|
|
lldb::UnwindPlanSP m_fast_unwind_plan_sp; // may be NULL
|
|
lldb::UnwindPlanSP m_full_unwind_plan_sp;
|
|
bool m_all_registers_available; // Can we retrieve all regs or just nonvolatile regs?
|
|
int m_frame_type; // enum FrameType
|
|
|
|
lldb::addr_t m_cfa;
|
|
lldb_private::Address m_start_pc;
|
|
lldb_private::Address m_current_pc;
|
|
|
|
int m_current_offset; // how far into the function we've executed; -1 if unknown
|
|
// 0 if no instructions have been executed yet.
|
|
|
|
int m_current_offset_backed_up_one; // how far into the function we've executed; -1 if unknown
|
|
// 0 if no instructions have been executed yet.
|
|
// On architectures where the return address on the stack points
|
|
// to the instruction after the CALL, this value will have 1
|
|
// subtracted from it. Else a function that ends in a CALL will
|
|
// have an offset pointing into the next function's address range.
|
|
// m_current_pc has the actual address of the "current" pc.
|
|
|
|
lldb_private::SymbolContext& m_sym_ctx;
|
|
bool m_sym_ctx_valid; // if ResolveSymbolContextForAddress fails, don't try to use m_sym_ctx
|
|
|
|
uint32_t m_frame_number; // What stack frame this RegisterContext is
|
|
|
|
std::map<uint32_t, lldb_private::UnwindLLDB::RegisterLocation> m_registers; // where to find reg values for this frame
|
|
|
|
lldb_private::UnwindLLDB& m_parent_unwind; // The UnwindLLDB that is creating this RegisterContextLLDB
|
|
|
|
//------------------------------------------------------------------
|
|
// For RegisterContextLLDB only
|
|
//------------------------------------------------------------------
|
|
|
|
DISALLOW_COPY_AND_ASSIGN (RegisterContextLLDB);
|
|
};
|
|
|
|
} // namespace lldb_private
|
|
|
|
#endif // lldb_RegisterContextLLDB_h_
|