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llvm-project/lldb/source/Core/Section.cpp

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//===-- Section.cpp ---------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/Section.h"
#include "lldb/Core/Module.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Target.h"
using namespace lldb;
using namespace lldb_private;
Section::Section
(
Section *parent,
Module* module,
user_id_t sect_id,
const ConstString &name,
SectionType sect_type,
addr_t file_addr,
addr_t byte_size,
uint64_t file_offset,
uint64_t file_size,
uint32_t flags
) :
ModuleChild (module),
UserID (sect_id),
Flags (flags),
m_parent (parent),
m_name (name),
m_type (sect_type),
m_file_addr (file_addr),
m_byte_size (byte_size),
m_file_offset (file_offset),
m_file_size (file_size),
m_children (),
m_fake (false),
m_linked_section(NULL),
m_linked_offset (0)
{
}
Section::~Section()
{
}
// Get a valid shared pointer to this section object
SectionSP
Section::GetSharedPointer() const
{
SectionSP this_sp;
if (m_parent)
this_sp = m_parent->GetChildren().GetSharedPointer (this, false);
else
{
ObjectFile *objfile = m_module->GetObjectFile();
if (objfile)
{
SectionList *section_list = objfile->GetSectionList();
if (section_list)
this_sp = section_list->GetSharedPointer (this, false);
}
}
return this_sp;
}
ConstString&
Section::GetName()
{
if (m_linked_section)
return const_cast<Section *>(m_linked_section)->GetName();
return m_name;
}
const ConstString&
Section::GetName() const
{
if (m_linked_section)
return m_linked_section->GetName();
return m_name;
}
addr_t
Section::GetFileAddress () const
{
if (m_parent)
{
// This section has a parent which means m_file_addr is an offset into
// the parent section, so the file address for this section is the file
// address of the parent plus the offset
return m_parent->GetFileAddress() + m_file_addr;
}
// This section has no parent, so m_file_addr is the file base address
return m_file_addr;
}
addr_t
Section::GetLinkedFileAddress () const
{
if (m_linked_section)
return m_linked_section->GetFileAddress() + m_linked_offset;
return LLDB_INVALID_ADDRESS;
}
addr_t
Section::GetLoadBaseAddress (Target *target) const
{
addr_t load_base_addr = LLDB_INVALID_ADDRESS;
if (m_linked_section)
{
load_base_addr = m_linked_section->GetLoadBaseAddress(target) + m_linked_offset;
}
else
if (m_parent)
{
load_base_addr = m_parent->GetLoadBaseAddress (target);
if (load_base_addr != LLDB_INVALID_ADDRESS)
load_base_addr += GetOffset();
}
else
{
load_base_addr = target->GetSectionLoadList().GetSectionLoadAddress (this);
}
return load_base_addr;
}
bool
Section::ResolveContainedAddress (addr_t offset, Address &so_addr) const
{
const uint32_t num_children = m_children.GetSize();
if (num_children > 0)
{
for (uint32_t i=0; i<num_children; i++)
{
Section* child_section = m_children.GetSectionAtIndex (i).get();
addr_t child_offset = child_section->GetOffset();
if (child_offset <= offset && offset - child_offset < child_section->GetByteSize())
return child_section->ResolveContainedAddress (offset - child_offset, so_addr);
}
}
if (m_linked_section)
{
so_addr.SetOffset(m_linked_offset + offset);
so_addr.SetSection(m_linked_section);
}
else
{
so_addr.SetOffset(offset);
so_addr.SetSection(this);
}
return true;
}
bool
Section::ContainsFileAddress (addr_t vm_addr) const
{
const addr_t file_addr = GetFileAddress();
if (file_addr != LLDB_INVALID_ADDRESS)
{
if (file_addr <= vm_addr)
{
const addr_t offset = vm_addr - file_addr;
return offset < GetByteSize();
}
}
return false;
}
bool
Section::ContainsLinkedFileAddress (addr_t vm_addr) const
{
const addr_t linked_file_addr = GetLinkedFileAddress();
if (linked_file_addr != LLDB_INVALID_ADDRESS)
{
if (linked_file_addr <= vm_addr)
{
const addr_t offset = vm_addr - linked_file_addr;
return offset < GetByteSize();
}
}
return false;
}
int
Section::Compare (const Section& a, const Section& b)
{
if (&a == &b)
return 0;
const Module* a_module = a.GetModule();
const Module* b_module = b.GetModule();
if (a_module == b_module)
{
user_id_t a_sect_uid = a.GetID();
user_id_t b_sect_uid = b.GetID();
if (a_sect_uid < b_sect_uid)
return -1;
if (a_sect_uid > b_sect_uid)
return 1;
return 0;
}
else
{
// The modules are different, just compare the module pointers
if (a_module < b_module)
return -1;
else
return 1; // We already know the modules aren't equal
}
}
void
Section::Dump (Stream *s, Target *target, uint32_t depth) const
{
// s->Printf("%.*p: ", (int)sizeof(void*) * 2, this);
s->Indent();
s->Printf("0x%8.8x %-14s ", GetID(), GetSectionTypeAsCString (m_type));
bool resolved = true;
addr_t addr = LLDB_INVALID_ADDRESS;
if (GetByteSize() == 0)
s->Printf("%39s", "");
else
{
if (target && m_linked_section == NULL)
addr = GetLoadBaseAddress (target);
if (addr == LLDB_INVALID_ADDRESS)
{
if (target)
resolved = false;
addr = GetFileAddress();
}
VMRange range(addr, addr + m_byte_size);
range.Dump (s, 0);
}
s->Printf("%c 0x%8.8llx 0x%8.8llx 0x%8.8x ", resolved ? ' ' : '*', m_file_offset, m_file_size, Get());
DumpName (s);
s->EOL();
if (m_linked_section)
{
addr = LLDB_INVALID_ADDRESS;
resolved = true;
if (target)
{
addr = m_linked_section->GetLoadBaseAddress(target);
if (addr != LLDB_INVALID_ADDRESS)
addr += m_linked_offset;
}
if (addr == LLDB_INVALID_ADDRESS)
{
if (target)
resolved = false;
addr = m_linked_section->GetFileAddress() + m_linked_offset;
}
int indent = 26 + s->GetIndentLevel();
s->Printf("%*.*s", indent, indent, "");
VMRange linked_range(addr, addr + m_byte_size);
linked_range.Dump (s, 0);
indent = 3 * (sizeof(uint32_t) * 2 + 2 + 1) + 1;
s->Printf("%c%*.*s", resolved ? ' ' : '*', indent, indent, "");
m_linked_section->DumpName(s);
s->Printf(" + 0x%llx\n", m_linked_offset);
}
if (depth > 0)
m_children.Dump(s, target, false, depth - 1);
}
void
Section::DumpName (Stream *s) const
{
if (m_parent == NULL)
{
// The top most section prints the module basename
const char *module_basename = m_module->GetFileSpec().GetFilename().AsCString();
if (module_basename && module_basename[0])
s->Printf("%s.", module_basename);
}
else
{
m_parent->DumpName (s);
s->PutChar('.');
}
m_name.Dump(s);
}
//----------------------------------------------------------------------
// Get the section data from a complete contiguous copy of the
// entire executable image.
//----------------------------------------------------------------------
size_t
Section::GetSectionDataFromImage (const DataExtractor& image_data, DataExtractor& section_data) const
{
size_t file_size = GetByteSize();
if (file_size > 0)
{
off_t file_offset = GetFileOffset();
if (section_data.SetData (image_data, file_offset, file_size) == file_size)
return true;
}
return false;
}
size_t
Section::ReadSectionDataFromObjectFile (const ObjectFile* objfile, off_t section_offset, void *dst, size_t dst_len) const
{
if (objfile && dst && dst_len)
{
const FileSpec& file = objfile->GetFileSpec();
if (file)
{
size_t bytes_left = dst_len;
size_t bytes_read = 0;
const uint64_t file_size = GetFileSize();
if (section_offset < file_size)
{
off_t section_file_offset = objfile->GetOffset() + GetFileOffset() + section_offset;
bytes_read = file.ReadFileContents (section_file_offset, dst, dst_len);
if (bytes_read >= dst_len)
return bytes_read;
bytes_left -= bytes_read;
}
const uint64_t byte_size = GetByteSize();
if (section_offset + bytes_read < byte_size)
{
memset ((uint8_t*)dst + bytes_read, 0, bytes_left);
bytes_read += bytes_left;
}
return bytes_read;
}
}
return 0;
}
//----------------------------------------------------------------------
// Get the section data the file on disk
//----------------------------------------------------------------------
size_t
Section::ReadSectionDataFromObjectFile(const ObjectFile* objfile, DataExtractor& section_data) const
{
if (objfile == NULL)
return 0;
const FileSpec& file = objfile->GetFileSpec();
if (file)
{
size_t section_file_size = GetByteSize();
if (section_file_size > 0)
{
off_t section_file_offset = GetFileOffset() + objfile->GetOffset();
DataBufferSP section_data_sp(file.ReadFileContents(section_file_offset, section_file_size));
section_data.SetByteOrder(objfile->GetByteOrder());
section_data.SetAddressByteSize(objfile->GetAddressByteSize());
return section_data.SetData (section_data_sp);
}
}
return 0;
}
size_t
Section::MemoryMapSectionDataFromObjectFile(const ObjectFile* objfile, DataExtractor& section_data) const
{
if (objfile == NULL)
return 0;
const FileSpec& file = objfile->GetFileSpec();
if (file)
{
size_t section_file_size = GetFileSize();
if (section_file_size > 0)
{
off_t section_file_offset = GetFileOffset() + objfile->GetOffset();
DataBufferSP section_data_sp(file.MemoryMapFileContents(section_file_offset, section_file_size));
section_data.SetByteOrder(objfile->GetByteOrder());
section_data.SetAddressByteSize(objfile->GetAddressByteSize());
return section_data.SetData (section_data_sp);
}
}
return 0;
}
bool
Section::IsDescendant (const Section *section)
{
if (this == section)
return true;
if (m_parent)
return m_parent->IsDescendant (section);
return false;
}
bool
Section::Slide (addr_t slide_amount, bool slide_children)
{
if (m_file_addr != LLDB_INVALID_ADDRESS)
{
if (slide_amount == 0)
return true;
m_file_addr += slide_amount;
if (slide_children)
m_children.Slide (slide_amount, slide_children);
return true;
}
return false;
}
void
Section::SetLinkedLocation (const Section *linked_section, uint64_t linked_offset)
{
if (linked_section)
m_module = linked_section->GetModule();
m_linked_section = linked_section;
m_linked_offset = linked_offset;
}
#pragma mark SectionList
SectionList::SectionList () :
m_sections()
{
}
SectionList::~SectionList ()
{
}
uint32_t
SectionList::AddSection (SectionSP& sect_sp)
{
uint32_t section_index = m_sections.size();
m_sections.push_back(sect_sp);
return section_index;
}
uint32_t
SectionList::FindSectionIndex (const Section* sect)
{
iterator sect_iter;
iterator begin = m_sections.begin();
iterator end = m_sections.end();
for (sect_iter = begin; sect_iter != end; ++sect_iter)
{
if (sect_iter->get() == sect)
{
// The secton was already in this section list
return std::distance (begin, sect_iter);
}
}
return UINT32_MAX;
}
uint32_t
SectionList::AddUniqueSection (SectionSP& sect_sp)
{
uint32_t sect_idx = FindSectionIndex (sect_sp.get());
if (sect_idx == UINT32_MAX)
sect_idx = AddSection (sect_sp);
return sect_idx;
}
bool
SectionList::ReplaceSection (user_id_t sect_id, SectionSP& sect_sp, uint32_t depth)
{
iterator sect_iter, end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end; ++sect_iter)
{
if ((*sect_iter)->GetID() == sect_id)
{
*sect_iter = sect_sp;
return true;
}
else if (depth > 0)
{
if ((*sect_iter)->GetChildren().ReplaceSection(sect_id, sect_sp, depth - 1))
return true;
}
}
return false;
}
size_t
SectionList::GetNumSections (uint32_t depth) const
{
size_t count = m_sections.size();
if (depth > 0)
{
const_iterator sect_iter, end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end; ++sect_iter)
{
count += (*sect_iter)->GetChildren().GetNumSections(depth - 1);
}
}
return count;
}
SectionSP
SectionList::GetSectionAtIndex (uint32_t idx) const
{
SectionSP sect_sp;
if (idx < m_sections.size())
sect_sp = m_sections[idx];
return sect_sp;
}
SectionSP
SectionList::FindSectionByName (const ConstString &section_dstr) const
{
SectionSP sect_sp;
// Check if we have a valid section string
if (section_dstr)
{
const_iterator sect_iter;
const_iterator end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end && sect_sp.get() == NULL; ++sect_iter)
{
if ((*sect_iter)->GetName() == section_dstr)
{
sect_sp = *sect_iter;
}
else
{
sect_sp = (*sect_iter)->GetChildren().FindSectionByName(section_dstr);
}
}
}
return sect_sp;
}
SectionSP
SectionList::FindSectionByID (user_id_t sect_id) const
{
SectionSP sect_sp;
if (sect_id)
{
const_iterator sect_iter;
const_iterator end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end && sect_sp.get() == NULL; ++sect_iter)
{
if ((*sect_iter)->GetID() == sect_id)
{
sect_sp = *sect_iter;
break;
}
else
{
sect_sp = (*sect_iter)->GetChildren().FindSectionByID (sect_id);
}
}
}
return sect_sp;
}
SectionSP
SectionList::FindSectionByType (SectionType sect_type, bool check_children, uint32_t start_idx) const
{
SectionSP sect_sp;
uint32_t num_sections = m_sections.size();
for (uint32_t idx = start_idx; idx < num_sections; ++idx)
{
if (m_sections[idx]->GetType() == sect_type)
{
sect_sp = m_sections[idx];
break;
}
else if (check_children)
{
sect_sp = m_sections[idx]->GetChildren().FindSectionByType (sect_type, check_children, 0);
if (sect_sp)
break;
}
}
return sect_sp;
}
SectionSP
SectionList::GetSharedPointer (const Section *section, bool check_children) const
{
SectionSP sect_sp;
if (section)
{
const_iterator sect_iter;
const_iterator end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end && sect_sp.get() == NULL; ++sect_iter)
{
if (sect_iter->get() == section)
{
sect_sp = *sect_iter;
break;
}
else if (check_children)
{
sect_sp = (*sect_iter)->GetChildren().GetSharedPointer (section, true);
}
}
}
return sect_sp;
}
SectionSP
SectionList::FindSectionContainingFileAddress (addr_t vm_addr, uint32_t depth) const
{
SectionSP sect_sp;
const_iterator sect_iter;
const_iterator end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end && sect_sp.get() == NULL; ++sect_iter)
{
Section *sect = sect_iter->get();
if (sect->ContainsFileAddress (vm_addr))
{
// The file address is in this section. We need to make sure one of our child
// sections doesn't contain this address as well as obeying the depth limit
// that was passed in.
if (depth > 0)
sect_sp = sect->GetChildren().FindSectionContainingFileAddress(vm_addr, depth - 1);
if (sect_sp.get() == NULL && !sect->IsFake())
sect_sp = *sect_iter;
}
}
return sect_sp;
}
SectionSP
SectionList::FindSectionContainingLinkedFileAddress (addr_t vm_addr, uint32_t depth) const
{
SectionSP sect_sp;
const_iterator sect_iter;
const_iterator end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end && sect_sp.get() == NULL; ++sect_iter)
{
Section *sect = sect_iter->get();
if (sect->ContainsLinkedFileAddress (vm_addr))
{
sect_sp = *sect_iter;
}
else if (depth > 0)
{
sect_sp = sect->GetChildren().FindSectionContainingLinkedFileAddress (vm_addr, depth - 1);
}
}
return sect_sp;
}
bool
SectionList::ContainsSection(user_id_t sect_id) const
{
return FindSectionByID (sect_id).get() != NULL;
}
void
SectionList::Dump (Stream *s, Target *target, bool show_header, uint32_t depth) const
{
bool target_has_loaded_sections = target && !target->GetSectionLoadList().IsEmpty();
if (show_header && !m_sections.empty())
{
// s->Printf("%.*p: ", (int)sizeof(void*) * 2, this);
// s->Indent();
// s->PutCString( "SectionList\n");
// s->IndentMore();
// s->Printf("%*s", 2*(sizeof(void *) + 2), "");
s->Indent();
s->Printf("SectID Type %s Address File Off. File Size Flags Section Name\n", target_has_loaded_sections ? "Load" : "File");
// s->Printf("%*s", 2*(sizeof(void *) + 2), "");
s->Indent();
s->PutCString("---------- -------------- --------------------------------------- ---------- ---------- ---------- ----------------------------\n");
}
const_iterator sect_iter;
const_iterator end = m_sections.end();
for (sect_iter = m_sections.begin(); sect_iter != end; ++sect_iter)
{
(*sect_iter)->Dump(s, target_has_loaded_sections ? target : NULL, depth);
}
if (show_header && !m_sections.empty())
s->IndentLess();
}
size_t
SectionList::Slide (addr_t slide_amount, bool slide_children)
{
size_t count = 0;
const_iterator pos, end = m_sections.end();
for (pos = m_sections.begin(); pos != end; ++pos)
{
if ((*pos)->Slide(slide_amount, slide_children))
++count;
}
return count;
}
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