llvm-project/lldb/source/Target/SectionLoadList.cpp

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//===-- SectionLoadList.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 "lldb/Target/SectionLoadList.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/Block.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Stream.h"
using namespace lldb;
using namespace lldb_private;
SectionLoadList::SectionLoadList(const SectionLoadList &rhs)
: m_addr_to_sect(), m_sect_to_addr(), m_mutex() {
std::lock_guard<std::recursive_mutex> guard(rhs.m_mutex);
m_addr_to_sect = rhs.m_addr_to_sect;
m_sect_to_addr = rhs.m_sect_to_addr;
}
void SectionLoadList::operator=(const SectionLoadList &rhs) {
std::lock_guard<std::recursive_mutex> lhs_guard(m_mutex);
std::lock_guard<std::recursive_mutex> rhs_guard(rhs.m_mutex);
m_addr_to_sect = rhs.m_addr_to_sect;
m_sect_to_addr = rhs.m_sect_to_addr;
}
bool SectionLoadList::IsEmpty() const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return m_addr_to_sect.empty();
}
void SectionLoadList::Clear() {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
m_addr_to_sect.clear();
m_sect_to_addr.clear();
}
addr_t
SectionLoadList::GetSectionLoadAddress(const lldb::SectionSP &section) const {
// TODO: add support for the same section having multiple load addresses
addr_t section_load_addr = LLDB_INVALID_ADDRESS;
if (section) {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
sect_to_addr_collection::const_iterator pos =
m_sect_to_addr.find(section.get());
if (pos != m_sect_to_addr.end())
section_load_addr = pos->second;
}
return section_load_addr;
}
bool SectionLoadList::SetSectionLoadAddress(const lldb::SectionSP &section,
addr_t load_addr,
bool warn_multiple) {
Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
ModuleSP module_sp(section->GetModule());
if (module_sp) {
LLDB_LOGV(log, "(section = {0} ({1}.{2}), load_addr = {3:x}) module = {4}",
section.get(), module_sp->GetFileSpec(), section->GetName(),
load_addr, module_sp.get());
if (section->GetByteSize() == 0)
return false; // No change
// Fill in the section -> load_addr map
std::lock_guard<std::recursive_mutex> guard(m_mutex);
sect_to_addr_collection::iterator sta_pos =
m_sect_to_addr.find(section.get());
if (sta_pos != m_sect_to_addr.end()) {
if (load_addr == sta_pos->second)
return false; // No change...
else
sta_pos->second = load_addr;
} else
m_sect_to_addr[section.get()] = load_addr;
// Fill in the load_addr -> section map
addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
if (ats_pos != m_addr_to_sect.end()) {
// Some sections are ok to overlap, and for others we should warn. When
// we have multiple load addresses that correspond to a section, we will
// always attribute the section to the be last section that claims it
// exists at that address. Sometimes it is ok for more that one section
// to be loaded at a specific load address, and other times it isn't. The
// "warn_multiple" parameter tells us if we should warn in this case or
// not. The DynamicLoader plug-in subclasses should know which sections
// should warn and which shouldn't (darwin shared cache modules all
// shared the same "__LINKEDIT" sections, so the dynamic loader can pass
// false for "warn_multiple").
if (warn_multiple && section != ats_pos->second) {
ModuleSP module_sp(section->GetModule());
if (module_sp) {
ModuleSP curr_module_sp(ats_pos->second->GetModule());
if (curr_module_sp) {
module_sp->ReportWarning(
"address 0x%16.16" PRIx64
" maps to more than one section: %s.%s and %s.%s",
load_addr, module_sp->GetFileSpec().GetFilename().GetCString(),
section->GetName().GetCString(),
curr_module_sp->GetFileSpec().GetFilename().GetCString(),
ats_pos->second->GetName().GetCString());
}
}
}
ats_pos->second = section;
} else
m_addr_to_sect[load_addr] = section;
return true; // Changed
} else {
if (log) {
log->Printf(
"SectionLoadList::%s (section = %p (%s), load_addr = 0x%16.16" PRIx64
") error: module has been deleted",
__FUNCTION__, static_cast<void *>(section.get()),
section->GetName().AsCString(), load_addr);
}
}
return false;
}
size_t SectionLoadList::SetSectionUnloaded(const lldb::SectionSP &section_sp) {
size_t unload_count = 0;
if (section_sp) {
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if (log && log->GetVerbose()) {
ModuleSP module_sp = section_sp->GetModule();
std::string module_name("<Unknown>");
if (module_sp) {
const FileSpec &module_file_spec(
section_sp->GetModule()->GetFileSpec());
module_name = module_file_spec.GetPath();
}
log->Printf("SectionLoadList::%s (section = %p (%s.%s))", __FUNCTION__,
static_cast<void *>(section_sp.get()), module_name.c_str(),
section_sp->GetName().AsCString());
}
std::lock_guard<std::recursive_mutex> guard(m_mutex);
sect_to_addr_collection::iterator sta_pos =
m_sect_to_addr.find(section_sp.get());
if (sta_pos != m_sect_to_addr.end()) {
++unload_count;
addr_t load_addr = sta_pos->second;
m_sect_to_addr.erase(sta_pos);
addr_to_sect_collection::iterator ats_pos =
m_addr_to_sect.find(load_addr);
if (ats_pos != m_addr_to_sect.end())
m_addr_to_sect.erase(ats_pos);
}
}
return unload_count;
}
bool SectionLoadList::SetSectionUnloaded(const lldb::SectionSP &section_sp,
addr_t load_addr) {
Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if (log && log->GetVerbose()) {
ModuleSP module_sp = section_sp->GetModule();
std::string module_name("<Unknown>");
if (module_sp) {
const FileSpec &module_file_spec(section_sp->GetModule()->GetFileSpec());
module_name = module_file_spec.GetPath();
}
log->Printf(
"SectionLoadList::%s (section = %p (%s.%s), load_addr = 0x%16.16" PRIx64
")",
__FUNCTION__, static_cast<void *>(section_sp.get()),
module_name.c_str(), section_sp->GetName().AsCString(), load_addr);
}
bool erased = false;
std::lock_guard<std::recursive_mutex> guard(m_mutex);
sect_to_addr_collection::iterator sta_pos =
m_sect_to_addr.find(section_sp.get());
if (sta_pos != m_sect_to_addr.end()) {
erased = true;
m_sect_to_addr.erase(sta_pos);
}
addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
if (ats_pos != m_addr_to_sect.end()) {
erased = true;
m_addr_to_sect.erase(ats_pos);
}
return erased;
}
bool SectionLoadList::ResolveLoadAddress(addr_t load_addr, Address &so_addr,
bool allow_section_end) const {
// First find the top level section that this load address exists in
std::lock_guard<std::recursive_mutex> guard(m_mutex);
if (!m_addr_to_sect.empty()) {
addr_to_sect_collection::const_iterator pos =
m_addr_to_sect.lower_bound(load_addr);
if (pos != m_addr_to_sect.end()) {
if (load_addr != pos->first && pos != m_addr_to_sect.begin())
--pos;
const addr_t pos_load_addr = pos->first;
if (load_addr >= pos_load_addr) {
addr_t offset = load_addr - pos_load_addr;
if (offset < pos->second->GetByteSize() + (allow_section_end ? 1 : 0)) {
// We have found the top level section, now we need to find the
// deepest child section.
return pos->second->ResolveContainedAddress(offset, so_addr,
allow_section_end);
}
}
} else {
// There are no entries that have an address that is >= load_addr, so we
// need to check the last entry on our collection.
addr_to_sect_collection::const_reverse_iterator rpos =
m_addr_to_sect.rbegin();
if (load_addr >= rpos->first) {
addr_t offset = load_addr - rpos->first;
if (offset <
rpos->second->GetByteSize() + (allow_section_end ? 1 : 0)) {
// We have found the top level section, now we need to find the
// deepest child section.
return rpos->second->ResolveContainedAddress(offset, so_addr,
allow_section_end);
}
}
}
}
so_addr.Clear();
return false;
}
void SectionLoadList::Dump(Stream &s, Target *target) {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
addr_to_sect_collection::const_iterator pos, end;
for (pos = m_addr_to_sect.begin(), end = m_addr_to_sect.end(); pos != end;
++pos) {
s.Printf("addr = 0x%16.16" PRIx64 ", section = %p: ", pos->first,
static_cast<void *>(pos->second.get()));
pos->second->Dump(&s, target, 0);
}
}