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//===-- DNBBreakpoint.h -----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Created by Greg Clayton on 6/29/07.
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_TOOLS_DEBUGSERVER_SOURCE_DNBBREAKPOINT_H
#define LLDB_TOOLS_DEBUGSERVER_SOURCE_DNBBREAKPOINT_H
#include <mach/mach.h>
#include <map>
#include <vector>
#include "DNBDefs.h"
class MachProcess;
class DNBBreakpoint {
public:
DNBBreakpoint(nub_addr_t m_addr, nub_size_t byte_size, bool hardware);
~DNBBreakpoint();
nub_size_t ByteSize() const { return m_byte_size; }
uint8_t *SavedOpcodeBytes() { return &m_opcode[0]; }
const uint8_t *SavedOpcodeBytes() const { return &m_opcode[0]; }
nub_addr_t Address() const { return m_addr; }
// nub_thread_t ThreadID() const { return m_tid; }
bool IsEnabled() const { return m_enabled; }
bool IntersectsRange(nub_addr_t addr, nub_size_t size,
nub_addr_t *intersect_addr, nub_size_t *intersect_size,
nub_size_t *opcode_offset) const {
// We only use software traps for software breakpoints
if (IsBreakpoint() && IsEnabled() && !IsHardware()) {
if (m_byte_size > 0) {
const nub_addr_t bp_end_addr = m_addr + m_byte_size;
const nub_addr_t end_addr = addr + size;
// Is the breakpoint end address before the passed in start address?
if (bp_end_addr <= addr)
return false;
// Is the breakpoint start address after passed in end address?
if (end_addr <= m_addr)
return false;
if (intersect_addr || intersect_size || opcode_offset) {
if (m_addr < addr) {
if (intersect_addr)
*intersect_addr = addr;
if (intersect_size)
*intersect_size =
std::min<nub_addr_t>(bp_end_addr, end_addr) - addr;
if (opcode_offset)
*opcode_offset = addr - m_addr;
} else {
if (intersect_addr)
*intersect_addr = m_addr;
if (intersect_size)
*intersect_size =
std::min<nub_addr_t>(bp_end_addr, end_addr) - m_addr;
if (opcode_offset)
*opcode_offset = 0;
}
}
return true;
}
}
return false;
}
void SetEnabled(bool enabled) {
if (!enabled)
SetHardwareIndex(INVALID_NUB_HW_INDEX);
m_enabled = enabled;
}
void SetIsWatchpoint(uint32_t type) {
m_is_watchpoint = 1;
m_watch_read = (type & WATCH_TYPE_READ) != 0;
m_watch_write = (type & WATCH_TYPE_WRITE) != 0;
}
bool IsBreakpoint() const { return m_is_watchpoint == 0; }
bool IsWatchpoint() const { return m_is_watchpoint == 1; }
bool WatchpointRead() const { return m_watch_read != 0; }
bool WatchpointWrite() const { return m_watch_write != 0; }
bool HardwarePreferred() const { return m_hw_preferred; }
bool IsHardware() const { return m_hw_index != INVALID_NUB_HW_INDEX; }
uint32_t GetHardwareIndex() const { return m_hw_index; }
void SetHardwareIndex(uint32_t hw_index) { m_hw_index = hw_index; }
void Dump() const;
uint32_t Retain() { return ++m_retain_count; }
uint32_t Release() {
if (m_retain_count == 0)
return 0;
return --m_retain_count;
}
private:
uint32_t m_retain_count; // Each breakpoint is maintained by address and is
// ref counted in case multiple people set a
// breakpoint at the same address
uint32_t m_byte_size; // Length in bytes of the breakpoint if set in memory
uint8_t m_opcode[8]; // Saved opcode bytes
nub_addr_t m_addr; // Address of this breakpoint
uint32_t m_enabled : 1, // Flags for this breakpoint
m_hw_preferred : 1, // 1 if this point has been requested to be set using
// hardware (which may fail due to lack of resources)
m_is_watchpoint : 1, // 1 if this is a watchpoint
m_watch_read : 1, // 1 if we stop when the watched data is read from
m_watch_write : 1; // 1 if we stop when the watched data is written to
uint32_t
m_hw_index; // The hardware resource index for this breakpoint/watchpoint
};
class DNBBreakpointList {
public:
DNBBreakpointList();
~DNBBreakpointList();
DNBBreakpoint *Add(nub_addr_t addr, nub_size_t length, bool hardware);
bool Remove(nub_addr_t addr);
DNBBreakpoint *FindByAddress(nub_addr_t addr);
const DNBBreakpoint *FindByAddress(nub_addr_t addr) const;
size_t FindBreakpointsThatOverlapRange(nub_addr_t addr, nub_addr_t size,
std::vector<DNBBreakpoint *> &bps);
void Dump() const;
size_t Size() const { return m_breakpoints.size(); }
void DisableAll();
void RemoveTrapsFromBuffer(nub_addr_t addr, nub_size_t size, void *buf) const;
void DisableAllBreakpoints(MachProcess *process);
void DisableAllWatchpoints(MachProcess *process);
void RemoveDisabled();
protected:
typedef std::map<nub_addr_t, DNBBreakpoint> collection;
typedef collection::iterator iterator;
typedef collection::const_iterator const_iterator;
collection m_breakpoints;
};
#endif
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