forked from OSchip/llvm-project
209 lines
7.8 KiB
C++
209 lines
7.8 KiB
C++
//===-- RegisterContextLLDB.h --------------------------------------------*- 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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#ifndef lldb_RegisterContextLLDB_h_
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#define lldb_RegisterContextLLDB_h_
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#include <vector>
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#include "lldb/lldb-private.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Symbol/UnwindPlan.h"
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#include "lldb/Symbol/SymbolContext.h"
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class RegisterContextLLDB : public lldb_private::RegisterContext
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{
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public:
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typedef lldb::SharedPtr<RegisterContextLLDB>::Type SharedPtr;
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RegisterContextLLDB (lldb_private::Thread &thread,
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const SharedPtr& next_frame,
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lldb_private::SymbolContext& sym_ctx,
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uint32_t frame_number);
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///
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// pure virtual functions from the base class that we must implement
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///
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virtual
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~RegisterContextLLDB () { }
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virtual void
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InvalidateAllRegisters ();
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virtual size_t
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GetRegisterCount ();
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virtual const lldb_private::RegisterInfo *
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GetRegisterInfoAtIndex (uint32_t reg);
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virtual size_t
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GetRegisterSetCount ();
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virtual const lldb_private::RegisterSet *
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GetRegisterSet (uint32_t reg_set);
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virtual bool
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ReadRegister (const lldb_private::RegisterInfo *reg_info, lldb_private::RegisterValue &value);
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virtual bool
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WriteRegister (const lldb_private::RegisterInfo *reg_info, const lldb_private::RegisterValue &value);
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virtual bool
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ReadAllRegisterValues (lldb::DataBufferSP &data_sp);
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virtual bool
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WriteAllRegisterValues (const lldb::DataBufferSP &data_sp);
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virtual uint32_t
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ConvertRegisterKindToRegisterNumber (uint32_t kind, uint32_t num);
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bool
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IsValid () const;
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bool
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GetCFA (lldb::addr_t& cfa);
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bool
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GetStartPC (lldb::addr_t& start_pc);
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bool
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ReadPC (lldb::addr_t& start_pc);
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private:
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enum FrameType
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{
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eNormalFrame,
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eSigtrampFrame,
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eDebuggerFrame, // a debugger inferior function call frame; we get caller's registers from debugger
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eNotAValidFrame // this frame is invalid for some reason - most likely it is past the top (end) of the stack
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};
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enum RegisterLocationTypes
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{
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eRegisterNotSaved = 0, // register was not preserved by callee. If volatile reg, is unavailable
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eRegisterSavedAtMemoryLocation, // register is saved at a specific word of target mem (target_memory_location)
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eRegisterInRegister, // register is available in a (possible other) register (register_number)
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eRegisterSavedAtHostMemoryLocation, // register is saved at a word in lldb's address space
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eRegisterValueInferred // register val was computed (and is in inferred_value)
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};
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struct RegisterLocation
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{
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int type;
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union
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{
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lldb::addr_t target_memory_location;
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uint32_t register_number; // in eRegisterKindLLDB register numbering system
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void* host_memory_location;
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uint64_t inferred_value; // eRegisterValueInferred - e.g. stack pointer == cfa + offset
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} location;
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};
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// Indicates whether this frame is frame zero -- the currently
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// executing frame -- or not. If it is not frame zero, m_next_frame's
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// shared pointer holds a pointer to the RegisterContextLLDB
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// object "below" this frame, i.e. this frame called m_next_frame's
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// function.
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bool
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IsFrameZero () const;
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void
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InitializeZerothFrame ();
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void
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InitializeNonZerothFrame();
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SharedPtr
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GetNextFrame ();
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// Provide a location for where THIS function saved the CALLER's register value
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// Or a frame "below" this one saved it, i.e. a function called by this one, preserved a register that this
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// function didn't modify/use.
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//
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// The RegisterLocation type may be set to eRegisterNotAvailable -- this will happen for a volatile register
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// being queried mid-stack. Instead of floating frame 0's contents of that register up the stack (which may
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// or may not be the value of that reg when the function was executing), we won't return any value.
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//
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// If a non-volatile register (a "preserved" register) is requested mid-stack and no frames "below" the requested
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// stack have saved the register anywhere, it is safe to assume that frame 0's register values are still the same
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// as the requesting frame's.
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//
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bool
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SavedLocationForRegister (uint32_t lldb_regnum, RegisterLocation ®loc);
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bool
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ReadRegisterValueFromRegisterLocation (RegisterLocation regloc,
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const lldb_private::RegisterInfo *reg_info,
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lldb_private::RegisterValue &value);
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bool
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WriteRegisterValueToRegisterLocation (RegisterLocation regloc,
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const lldb_private::RegisterInfo *reg_info,
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const lldb_private::RegisterValue &value);
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// Get the contents of a general purpose (address-size) register for this frame
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// (usually retrieved from the m_next_frame)
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// m_base_reg_ectx and m_next_frame should both be initialized appropriately before calling.
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bool
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ReadGPRValue (int register_kind, uint32_t regnum, lldb::addr_t &value);
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lldb::UnwindPlanSP
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GetFastUnwindPlanForFrame ();
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lldb::UnwindPlanSP
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GetFullUnwindPlanForFrame ();
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lldb_private::Thread& m_thread;
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SharedPtr m_next_frame;
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///
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// The following tell us how to retrieve the CALLER's register values (ie the "previous" frame, aka the frame above)
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// i.e. where THIS frame saved them
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///
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lldb::UnwindPlanSP m_fast_unwind_plan_sp; // may be NULL
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lldb::UnwindPlanSP m_full_unwind_plan_sp;
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bool m_all_registers_available; // Can we retrieve all regs or just nonvolatile regs?
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int m_frame_type; // enum FrameType
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lldb::addr_t m_cfa;
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lldb_private::Address m_start_pc;
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lldb_private::Address m_current_pc;
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int m_current_offset; // how far into the function we've executed; -1 if unknown
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// 0 if no instructions have been executed yet.
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int m_current_offset_backed_up_one; // how far into the function we've executed; -1 if unknown
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// 0 if no instructions have been executed yet.
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// On architectures where the return address on the stack points
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// to the instruction after the CALL, this value will have 1
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// subtracted from it. Else a function that ends in a CALL will
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// have an offset pointing into the next function's address range.
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// m_current_pc has the actual address of the "current" pc.
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lldb_private::SymbolContext& m_sym_ctx;
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bool m_sym_ctx_valid; // if ResolveSymbolContextForAddress fails, don't try to use m_sym_ctx
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uint32_t m_frame_number; // What stack frame level this frame is - used for debug logging
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std::map<uint32_t, RegisterLocation> m_registers; // where to find reg values for this frame
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//------------------------------------------------------------------
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// For RegisterContextLLDB only
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//------------------------------------------------------------------
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DISALLOW_COPY_AND_ASSIGN (RegisterContextLLDB);
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};
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#endif // lldb_RegisterContextLLDB_h_
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