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| //===-- BreakpointSite.cpp --------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#include <inttypes.h>
#include "lldb/Breakpoint/BreakpointSite.h"
#include "lldb/Breakpoint/Breakpoint.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/BreakpointSiteList.h"
#include "lldb/Utility/Stream.h"
using namespace lldb;
using namespace lldb_private;
BreakpointSite::BreakpointSite(BreakpointSiteList *list,
const BreakpointLocationSP &owner,
lldb::addr_t addr, bool use_hardware)
: StoppointLocation(GetNextID(), addr, 0, use_hardware),
m_type(eSoftware), // Process subclasses need to set this correctly using
// SetType()
m_saved_opcode(), m_trap_opcode(),
m_enabled(false), // Need to create it disabled, so the first enable turns
// it on.
m_owners(), m_owners_mutex() {
m_owners.Add(owner);
}
BreakpointSite::~BreakpointSite() {
BreakpointLocationSP bp_loc_sp;
const size_t owner_count = m_owners.GetSize();
for (size_t i = 0; i < owner_count; i++) {
m_owners.GetByIndex(i)->ClearBreakpointSite();
}
}
break_id_t BreakpointSite::GetNextID() {
static break_id_t g_next_id = 0;
return ++g_next_id;
}
// RETURNS - true if we should stop at this breakpoint, false if we
// should continue.
bool BreakpointSite::ShouldStop(StoppointCallbackContext *context) {
IncrementHitCount();
// ShouldStop can do a lot of work, and might even come come back and hit
// this breakpoint site again. So don't hold the m_owners_mutex the whole
// while. Instead make a local copy of the collection and call ShouldStop on
// the copy.
BreakpointLocationCollection owners_copy;
{
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
owners_copy = m_owners;
}
return owners_copy.ShouldStop(context);
}
bool BreakpointSite::IsBreakpointAtThisSite(lldb::break_id_t bp_id) {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
const size_t owner_count = m_owners.GetSize();
for (size_t i = 0; i < owner_count; i++) {
if (m_owners.GetByIndex(i)->GetBreakpoint().GetID() == bp_id)
return true;
}
return false;
}
void BreakpointSite::Dump(Stream *s) const {
if (s == nullptr)
return;
s->Printf("BreakpointSite %u: addr = 0x%8.8" PRIx64
" type = %s breakpoint hw_index = %i hit_count = %-4u",
GetID(), (uint64_t)m_addr, IsHardware() ? "hardware" : "software",
GetHardwareIndex(), GetHitCount());
}
void BreakpointSite::GetDescription(Stream *s, lldb::DescriptionLevel level) {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
if (level != lldb::eDescriptionLevelBrief)
s->Printf("breakpoint site: %d at 0x%8.8" PRIx64, GetID(),
GetLoadAddress());
m_owners.GetDescription(s, level);
}
bool BreakpointSite::IsInternal() const { return m_owners.IsInternal(); }
uint8_t *BreakpointSite::GetTrapOpcodeBytes() { return &m_trap_opcode[0]; }
const uint8_t *BreakpointSite::GetTrapOpcodeBytes() const {
return &m_trap_opcode[0];
}
size_t BreakpointSite::GetTrapOpcodeMaxByteSize() const {
return sizeof(m_trap_opcode);
}
bool BreakpointSite::SetTrapOpcode(const uint8_t *trap_opcode,
uint32_t trap_opcode_size) {
if (trap_opcode_size > 0 && trap_opcode_size <= sizeof(m_trap_opcode)) {
m_byte_size = trap_opcode_size;
::memcpy(m_trap_opcode, trap_opcode, trap_opcode_size);
return true;
}
m_byte_size = 0;
return false;
}
uint8_t *BreakpointSite::GetSavedOpcodeBytes() { return &m_saved_opcode[0]; }
const uint8_t *BreakpointSite::GetSavedOpcodeBytes() const {
return &m_saved_opcode[0];
}
bool BreakpointSite::IsEnabled() const { return m_enabled; }
void BreakpointSite::SetEnabled(bool enabled) { m_enabled = enabled; }
void BreakpointSite::AddOwner(const BreakpointLocationSP &owner) {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
m_owners.Add(owner);
}
size_t BreakpointSite::RemoveOwner(lldb::break_id_t break_id,
lldb::break_id_t break_loc_id) {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
m_owners.Remove(break_id, break_loc_id);
return m_owners.GetSize();
}
size_t BreakpointSite::GetNumberOfOwners() {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
return m_owners.GetSize();
}
BreakpointLocationSP BreakpointSite::GetOwnerAtIndex(size_t index) {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
return m_owners.GetByIndex(index);
}
bool BreakpointSite::ValidForThisThread(Thread *thread) {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
return m_owners.ValidForThisThread(thread);
}
void BreakpointSite::BumpHitCounts() {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
for (BreakpointLocationSP loc_sp : m_owners.BreakpointLocations()) {
loc_sp->BumpHitCount();
}
}
bool BreakpointSite::IntersectsRange(lldb::addr_t addr, size_t size,
lldb::addr_t *intersect_addr,
size_t *intersect_size,
size_t *opcode_offset) const {
// We only use software traps for software breakpoints
if (!IsHardware()) {
if (m_byte_size > 0) {
const lldb::addr_t bp_end_addr = m_addr + m_byte_size;
const lldb::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<lldb::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<lldb::addr_t>(bp_end_addr, end_addr) - m_addr;
if (opcode_offset)
*opcode_offset = 0;
}
}
return true;
}
}
return false;
}
size_t
BreakpointSite::CopyOwnersList(BreakpointLocationCollection &out_collection) {
std::lock_guard<std::recursive_mutex> guard(m_owners_mutex);
for (BreakpointLocationSP loc_sp : m_owners.BreakpointLocations()) {
out_collection.Add(loc_sp);
}
return out_collection.GetSize();
}
|