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

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//===-- Address.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/Address.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
using namespace lldb;
using namespace lldb_private;
static size_t
ReadBytes (ExecutionContextScope *exe_scope, const Address &address, void *dst, size_t dst_len)
{
if (exe_scope == NULL)
return 0;
Target *target = exe_scope->CalculateTarget();
if (target)
{
Error error;
bool prefer_file_cache = false;
return target->ReadMemory (address, prefer_file_cache, dst, dst_len, error);
}
return 0;
}
static bool
GetByteOrderAndAddressSize (ExecutionContextScope *exe_scope, const Address &address, ByteOrder& byte_order, uint32_t& addr_size)
{
byte_order = eByteOrderInvalid;
addr_size = 0;
if (exe_scope == NULL)
return false;
Target *target = exe_scope->CalculateTarget();
if (target)
{
byte_order = target->GetArchitecture().GetByteOrder();
addr_size = target->GetArchitecture().GetAddressByteSize();
}
if (byte_order == eByteOrderInvalid || addr_size == 0)
{
Module *module = address.GetModule();
if (module)
{
byte_order = module->GetArchitecture().GetByteOrder();
addr_size = module->GetArchitecture().GetAddressByteSize();
}
}
return byte_order != eByteOrderInvalid && addr_size != 0;
}
static uint64_t
ReadUIntMax64 (ExecutionContextScope *exe_scope, const Address &address, uint32_t byte_size, bool &success)
{
uint64_t uval64 = 0;
if (exe_scope == NULL || byte_size > sizeof(uint64_t))
{
success = false;
return 0;
}
uint64_t buf;
success = ReadBytes (exe_scope, address, &buf, byte_size) == byte_size;
if (success)
{
ByteOrder byte_order = eByteOrderInvalid;
uint32_t addr_size = 0;
if (GetByteOrderAndAddressSize (exe_scope, address, byte_order, addr_size))
{
DataExtractor data (&buf, sizeof(buf), byte_order, addr_size);
uint32_t offset = 0;
uval64 = data.GetU64(&offset);
}
else
success = false;
}
return uval64;
}
static bool
ReadAddress (ExecutionContextScope *exe_scope, const Address &address, uint32_t pointer_size, Address &deref_so_addr)
{
if (exe_scope == NULL)
return false;
bool success = false;
addr_t deref_addr = ReadUIntMax64 (exe_scope, address, pointer_size, success);
if (success)
{
ExecutionContext exe_ctx;
exe_scope->CalculateExecutionContext(exe_ctx);
// If we have any sections that are loaded, try and resolve using the
// section load list
if (exe_ctx.target && !exe_ctx.target->GetSectionLoadList().IsEmpty())
{
if (exe_ctx.target->GetSectionLoadList().ResolveLoadAddress (deref_addr, deref_so_addr))
return true;
}
else
{
// If we were not running, yet able to read an integer, we must
// have a module
Module *module = address.GetModule();
assert (module);
if (module->ResolveFileAddress(deref_addr, deref_so_addr))
return true;
}
// We couldn't make "deref_addr" into a section offset value, but we were
// able to read the address, so we return a section offset address with
// no section and "deref_addr" as the offset (address).
deref_so_addr.SetSection(NULL);
deref_so_addr.SetOffset(deref_addr);
return true;
}
return false;
}
static bool
DumpUInt (ExecutionContextScope *exe_scope, const Address &address, uint32_t byte_size, Stream* strm)
{
if (exe_scope == NULL || byte_size == 0)
return 0;
std::vector<uint8_t> buf(byte_size, 0);
if (ReadBytes (exe_scope, address, &buf[0], buf.size()) == buf.size())
{
ByteOrder byte_order = eByteOrderInvalid;
uint32_t addr_size = 0;
if (GetByteOrderAndAddressSize (exe_scope, address, byte_order, addr_size))
{
DataExtractor data (&buf.front(), buf.size(), byte_order, addr_size);
data.Dump (strm,
0, // Start offset in "data"
eFormatHex, // Print as characters
buf.size(), // Size of item
1, // Items count
UINT32_MAX, // num per line
LLDB_INVALID_ADDRESS,// base address
0, // bitfield bit size
0); // bitfield bit offset
return true;
}
}
return false;
}
static size_t
ReadCStringFromMemory (ExecutionContextScope *exe_scope, const Address &address, Stream *strm)
{
if (exe_scope == NULL)
return 0;
const size_t k_buf_len = 256;
char buf[k_buf_len+1];
buf[k_buf_len] = '\0'; // NULL terminate
// Byte order and address size don't matter for C string dumping..
DataExtractor data (buf, sizeof(buf), lldb::endian::InlHostByteOrder(), 4);
size_t total_len = 0;
size_t bytes_read;
Address curr_address(address);
strm->PutChar ('"');
while ((bytes_read = ReadBytes (exe_scope, curr_address, buf, k_buf_len)) > 0)
{
size_t len = strlen(buf);
if (len == 0)
break;
if (len > bytes_read)
len = bytes_read;
data.Dump (strm,
0, // Start offset in "data"
eFormatChar, // Print as characters
1, // Size of item (1 byte for a char!)
len, // How many bytes to print?
UINT32_MAX, // num per line
LLDB_INVALID_ADDRESS,// base address
0, // bitfield bit size
0); // bitfield bit offset
total_len += bytes_read;
if (len < k_buf_len)
break;
curr_address.SetOffset (curr_address.GetOffset() + bytes_read);
}
strm->PutChar ('"');
return total_len;
}
Address::Address (addr_t address, const SectionList * sections) :
m_section (NULL),
m_offset (LLDB_INVALID_ADDRESS)
{
ResolveAddressUsingFileSections(address, sections);
}
const Address&
Address::operator= (const Address& rhs)
{
if (this != &rhs)
{
m_section = rhs.m_section;
m_offset = rhs.m_offset;
}
return *this;
}
bool
Address::ResolveAddressUsingFileSections (addr_t addr, const SectionList *sections)
{
if (sections)
m_section = sections->FindSectionContainingFileAddress(addr).get();
else
m_section = NULL;
if (m_section != NULL)
{
assert( m_section->ContainsFileAddress(addr) );
m_offset = addr - m_section->GetFileAddress();
return true; // Successfully transformed addr into a section offset address
}
m_offset = addr;
return false; // Failed to resolve this address to a section offset value
}
Module *
Address::GetModule () const
{
if (m_section)
return m_section->GetModule();
return NULL;
}
addr_t
Address::GetFileAddress () const
{
if (m_section != NULL)
{
addr_t sect_file_addr = m_section->GetFileAddress();
if (sect_file_addr == LLDB_INVALID_ADDRESS)
{
// Section isn't resolved, we can't return a valid file address
return LLDB_INVALID_ADDRESS;
}
// We have a valid file range, so we can return the file based
// address by adding the file base address to our offset
return sect_file_addr + m_offset;
}
// No section, we just return the offset since it is the value in this case
return m_offset;
}
addr_t
Address::GetLoadAddress (Target *target) const
{
if (m_section == NULL)
{
// No section, we just return the offset since it is the value in this case
return m_offset;
}
if (target)
{
addr_t sect_load_addr = m_section->GetLoadBaseAddress (target);
if (sect_load_addr != LLDB_INVALID_ADDRESS)
{
// We have a valid file range, so we can return the file based
// address by adding the file base address to our offset
return sect_load_addr + m_offset;
}
}
// The section isn't resolved or no process was supplied so we can't
// return a valid file address.
return LLDB_INVALID_ADDRESS;
}
bool
Address::Dump (Stream *s, ExecutionContextScope *exe_scope, DumpStyle style, DumpStyle fallback_style, uint32_t addr_size) const
{
// If the section was NULL, only load address is going to work.
if (m_section == NULL)
style = DumpStyleLoadAddress;
Target *target = NULL;
Process *process = NULL;
if (exe_scope)
{
target = exe_scope->CalculateTarget();
process = exe_scope->CalculateProcess();
}
// If addr_byte_size is UINT32_MAX, then determine the correct address
// byte size for the process or default to the size of addr_t
if (addr_size == UINT32_MAX)
{
if (process)
addr_size = target->GetArchitecture().GetAddressByteSize ();
else
addr_size = sizeof(addr_t);
}
Address so_addr;
switch (style)
{
case DumpStyleInvalid:
return false;
case DumpStyleSectionNameOffset:
if (m_section != NULL)
{
m_section->DumpName(s);
s->Printf (" + %llu", m_offset);
}
else
{
s->Address(m_offset, addr_size);
}
break;
case DumpStyleSectionPointerOffset:
s->Printf("(Section *)%.*p + ", (int)sizeof(void*) * 2, m_section);
s->Address(m_offset, addr_size);
break;
case DumpStyleModuleWithFileAddress:
if (m_section)
s->Printf("%s[", m_section->GetModule()->GetFileSpec().GetFilename().AsCString());
// Fall through
case DumpStyleFileAddress:
{
addr_t file_addr = GetFileAddress();
if (file_addr == LLDB_INVALID_ADDRESS)
{
if (fallback_style != DumpStyleInvalid)
return Dump (s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
return false;
}
s->Address (file_addr, addr_size);
if (style == DumpStyleModuleWithFileAddress && m_section)
s->PutChar(']');
}
break;
case DumpStyleLoadAddress:
{
addr_t load_addr = GetLoadAddress (target);
if (load_addr == LLDB_INVALID_ADDRESS)
{
if (fallback_style != DumpStyleInvalid)
return Dump (s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
return false;
}
s->Address (load_addr, addr_size);
}
break;
case DumpStyleResolvedDescription:
case DumpStyleResolvedDescriptionNoModule:
if (IsSectionOffset())
{
AddressType addr_type = eAddressTypeLoad;
addr_t addr = GetLoadAddress (target);
if (addr == LLDB_INVALID_ADDRESS)
{
addr = GetFileAddress();
addr_type = eAddressTypeFile;
}
uint32_t pointer_size = 4;
Module *module = GetModule();
if (target)
pointer_size = target->GetArchitecture().GetAddressByteSize();
else if (module)
pointer_size = module->GetArchitecture().GetAddressByteSize();
bool showed_info = false;
const Section *section = GetSection();
if (section)
{
SectionType sect_type = section->GetType();
switch (sect_type)
{
case eSectionTypeData:
if (module)
{
ObjectFile *objfile = module->GetObjectFile();
if (objfile)
{
Symtab *symtab = objfile->GetSymtab();
if (symtab)
{
const addr_t file_Addr = GetFileAddress();
Symbol *symbol = symtab->FindSymbolContainingFileAddress (file_Addr);
if (symbol)
{
const char *symbol_name = symbol->GetName().AsCString();
if (symbol_name)
{
s->PutCString(symbol_name);
addr_t delta = file_Addr - symbol->GetAddressRangePtr()->GetBaseAddress().GetFileAddress();
if (delta)
s->Printf(" + %llu", delta);
showed_info = true;
}
}
}
}
}
break;
case eSectionTypeDataCString:
// Read the C string from memory and display it
showed_info = true;
ReadCStringFromMemory (exe_scope, *this, s);
break;
case eSectionTypeDataCStringPointers:
{
if (ReadAddress (exe_scope, *this, pointer_size, so_addr))
{
#if VERBOSE_OUTPUT
s->PutCString("(char *)");
so_addr.Dump(s, exe_scope, DumpStyleLoadAddress, DumpStyleFileAddress);
s->PutCString(": ");
#endif
showed_info = true;
ReadCStringFromMemory (exe_scope, so_addr, s);
}
}
break;
case eSectionTypeDataObjCMessageRefs:
{
if (ReadAddress (exe_scope, *this, pointer_size, so_addr))
{
if (target && so_addr.IsSectionOffset())
{
SymbolContext func_sc;
target->GetImages().ResolveSymbolContextForAddress (so_addr,
eSymbolContextEverything,
func_sc);
if (func_sc.function || func_sc.symbol)
{
showed_info = true;
#if VERBOSE_OUTPUT
s->PutCString ("(objc_msgref *) -> { (func*)");
so_addr.Dump(s, exe_scope, DumpStyleLoadAddress, DumpStyleFileAddress);
#else
s->PutCString ("{ ");
#endif
Address cstr_addr(*this);
cstr_addr.SetOffset(cstr_addr.GetOffset() + pointer_size);
func_sc.DumpStopContext(s, exe_scope, so_addr, true, true, false);
if (ReadAddress (exe_scope, cstr_addr, pointer_size, so_addr))
{
#if VERBOSE_OUTPUT
s->PutCString("), (char *)");
so_addr.Dump(s, exe_scope, DumpStyleLoadAddress, DumpStyleFileAddress);
s->PutCString(" (");
#else
s->PutCString(", ");
#endif
ReadCStringFromMemory (exe_scope, so_addr, s);
}
#if VERBOSE_OUTPUT
s->PutCString(") }");
#else
s->PutCString(" }");
#endif
}
}
}
}
break;
case eSectionTypeDataObjCCFStrings:
{
Address cfstring_data_addr(*this);
cfstring_data_addr.SetOffset(cfstring_data_addr.GetOffset() + (2 * pointer_size));
if (ReadAddress (exe_scope, cfstring_data_addr, pointer_size, so_addr))
{
#if VERBOSE_OUTPUT
s->PutCString("(CFString *) ");
cfstring_data_addr.Dump(s, exe_scope, DumpStyleLoadAddress, DumpStyleFileAddress);
s->PutCString(" -> @");
#else
s->PutChar('@');
#endif
if (so_addr.Dump(s, exe_scope, DumpStyleResolvedDescription))
showed_info = true;
}
}
break;
case eSectionTypeData4:
// Read the 4 byte data and display it
showed_info = true;
s->PutCString("(uint32_t) ");
DumpUInt (exe_scope, *this, 4, s);
break;
case eSectionTypeData8:
// Read the 8 byte data and display it
showed_info = true;
s->PutCString("(uint64_t) ");
DumpUInt (exe_scope, *this, 8, s);
break;
case eSectionTypeData16:
// Read the 16 byte data and display it
showed_info = true;
s->PutCString("(uint128_t) ");
DumpUInt (exe_scope, *this, 16, s);
break;
case eSectionTypeDataPointers:
// Read the pointer data and display it
{
if (ReadAddress (exe_scope, *this, pointer_size, so_addr))
{
s->PutCString ("(void *)");
so_addr.Dump(s, exe_scope, DumpStyleLoadAddress, DumpStyleFileAddress);
showed_info = true;
if (so_addr.IsSectionOffset())
{
SymbolContext pointer_sc;
if (target)
{
target->GetImages().ResolveSymbolContextForAddress (so_addr,
eSymbolContextEverything,
pointer_sc);
if (pointer_sc.function || pointer_sc.symbol)
{
s->PutCString(": ");
pointer_sc.DumpStopContext(s, exe_scope, so_addr, true, false, false);
}
}
}
}
}
break;
default:
break;
}
}
if (!showed_info)
{
if (module)
{
SymbolContext sc;
module->ResolveSymbolContextForAddress(*this, eSymbolContextEverything, sc);
if (sc.function || sc.symbol)
{
bool show_stop_context = true;
const bool show_module = (style == DumpStyleResolvedDescription);
const bool show_fullpaths = false;
const bool show_inlined_frames = true;
if (sc.function == NULL && sc.symbol != NULL)
{
// If we have just a symbol make sure it is in the right section
if (sc.symbol->GetAddressRangePtr())
{
if (sc.symbol->GetAddressRangePtr()->GetBaseAddress().GetSection() != GetSection())
{
// don't show the module if the symbol is a trampoline symbol
show_stop_context = false;
}
}
}
if (show_stop_context)
{
// We have a function or a symbol from the same
// sections as this address.
sc.DumpStopContext (s,
exe_scope,
*this,
show_fullpaths,
show_module,
show_inlined_frames);
}
else
{
// We found a symbol but it was in a different
// section so it isn't the symbol we should be
// showing, just show the section name + offset
Dump (s, exe_scope, DumpStyleSectionNameOffset);
}
}
}
}
}
else
{
if (fallback_style != DumpStyleInvalid)
return Dump (s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
return false;
}
break;
case DumpStyleDetailedSymbolContext:
if (IsSectionOffset())
{
Module *module = GetModule();
if (module)
{
SymbolContext sc;
module->ResolveSymbolContextForAddress(*this, eSymbolContextEverything, sc);
if (sc.symbol)
{
// If we have just a symbol make sure it is in the same section
// as our address. If it isn't, then we might have just found
// the last symbol that came before the address that we are
// looking up that has nothing to do with our address lookup.
if (sc.symbol->GetAddressRangePtr() && sc.symbol->GetAddressRangePtr()->GetBaseAddress().GetSection() != GetSection())
sc.symbol = NULL;
}
sc.GetDescription(s, eDescriptionLevelBrief, target);
}
}
if (fallback_style != DumpStyleInvalid)
return Dump (s, exe_scope, fallback_style, DumpStyleInvalid, addr_size);
return false;
break;
}
return true;
}
void
Address::CalculateSymbolContext (SymbolContext *sc)
{
sc->Clear();
// Absolute addresses don't have enough information to reconstruct even their target.
if (m_section == NULL)
return;
if (m_section->GetModule())
{
sc->module_sp = m_section->GetModule()->GetSP();
if (sc->module_sp)
sc->module_sp->ResolveSymbolContextForAddress (*this, eSymbolContextEverything, *sc);
}
}
int
Address::CompareFileAddress (const Address& a, const Address& b)
{
addr_t a_file_addr = a.GetFileAddress();
addr_t b_file_addr = b.GetFileAddress();
if (a_file_addr < b_file_addr)
return -1;
if (a_file_addr > b_file_addr)
return +1;
return 0;
}
int
Address::CompareLoadAddress (const Address& a, const Address& b, Target *target)
{
assert (target != NULL);
addr_t a_load_addr = a.GetLoadAddress (target);
addr_t b_load_addr = b.GetLoadAddress (target);
if (a_load_addr < b_load_addr)
return -1;
if (a_load_addr > b_load_addr)
return +1;
return 0;
}
int
Address::CompareModulePointerAndOffset (const Address& a, const Address& b)
{
Module *a_module = a.GetModule ();
Module *b_module = b.GetModule ();
if (a_module < b_module)
return -1;
if (a_module > b_module)
return +1;
// Modules are the same, just compare the file address since they should
// be unique
addr_t a_file_addr = a.GetFileAddress();
addr_t b_file_addr = b.GetFileAddress();
if (a_file_addr < b_file_addr)
return -1;
if (a_file_addr > b_file_addr)
return +1;
return 0;
}
size_t
Address::MemorySize () const
{
// Noting special for the memory size of a single Address object,
// it is just the size of itself.
return sizeof(Address);
}
//----------------------------------------------------------------------
// NOTE: Be careful using this operator. It can correctly compare two
// addresses from the same Module correctly. It can't compare two
// addresses from different modules in any meaningful way, but it will
// compare the module pointers.
//
// To sum things up:
// - works great for addresses within the same module
// - it works for addresses across multiple modules, but don't expect the
// address results to make much sense
//
// This basically lets Address objects be used in ordered collection
// classes.
//----------------------------------------------------------------------
bool
lldb_private::operator< (const Address& lhs, const Address& rhs)
{
Module *lhs_module = lhs.GetModule();
Module *rhs_module = rhs.GetModule();
if (lhs_module == rhs_module)
{
// Addresses are in the same module, just compare the file addresses
return lhs.GetFileAddress() < rhs.GetFileAddress();
}
else
{
// The addresses are from different modules, just use the module
// pointer value to get consistent ordering
return lhs_module < rhs_module;
}
}
bool
lldb_private::operator> (const Address& lhs, const Address& rhs)
{
Module *lhs_module = lhs.GetModule();
Module *rhs_module = rhs.GetModule();
if (lhs_module == rhs_module)
{
// Addresses are in the same module, just compare the file addresses
return lhs.GetFileAddress() > rhs.GetFileAddress();
}
else
{
// The addresses are from different modules, just use the module
// pointer value to get consistent ordering
return lhs_module > rhs_module;
}
}
// The operator == checks for exact equality only (same section, same offset)
bool
lldb_private::operator== (const Address& a, const Address& rhs)
{
return a.GetSection() == rhs.GetSection() &&
a.GetOffset() == rhs.GetOffset();
}
// The operator != checks for exact inequality only (differing section, or
// different offset)
bool
lldb_private::operator!= (const Address& a, const Address& rhs)
{
return a.GetSection() != rhs.GetSection() ||
a.GetOffset() != rhs.GetOffset();
}
bool
Address::IsLinkedAddress () const
{
return m_section && m_section->GetLinkedSection();
}
void
Address::ResolveLinkedAddress ()
{
if (m_section)
{
const Section *linked_section = m_section->GetLinkedSection();
if (linked_section)
{
m_offset += m_section->GetLinkedOffset();
m_section = linked_section;
}
}
}
AddressClass
Address::GetAddressClass () const
{
Module *module = GetModule();
if (module)
{
ObjectFile *obj_file = module->GetObjectFile();
if (obj_file)
return obj_file->GetAddressClass (GetFileAddress());
}
return eAddressClassUnknown;
}
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