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clang-p2996/lldb/source/Symbol/Symbol.cpp
Shafik Yaghmour 28c878aeb2 [LLDB] Applying clang-tidy modernize-use-default-member-init over LLDB 
Applied modernize-use-default-member-init clang-tidy check over LLDB.
It appears in many files we had already switched to in class member init but
never updated the constructors to reflect that. This check is already present in
the lldb/.clang-tidy config.

Differential Revision: https://reviews.llvm.org/D121481
2022-03-14 13:32:03 -07:00

726 lines
26 KiB
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//===-- Symbol.cpp --------------------------------------------------------===//
//
// 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/Symbol/Symbol.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolVendor.h"
#include "lldb/Symbol/Symtab.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataEncoder.h"
#include "lldb/Utility/Stream.h"
using namespace lldb;
using namespace lldb_private;
Symbol::Symbol()
: SymbolContextScope(), m_type_data_resolved(false), m_is_synthetic(false),
m_is_debug(false), m_is_external(false), m_size_is_sibling(false),
m_size_is_synthesized(false), m_size_is_valid(false),
m_demangled_is_synthesized(false), m_contains_linker_annotations(false),
m_is_weak(false), m_type(eSymbolTypeInvalid), m_mangled(),
m_addr_range() {}
Symbol::Symbol(uint32_t symID, llvm::StringRef name, SymbolType type,
bool external, bool is_debug, bool is_trampoline,
bool is_artificial, const lldb::SectionSP &section_sp,
addr_t offset, addr_t size, bool size_is_valid,
bool contains_linker_annotations, uint32_t flags)
: SymbolContextScope(), m_uid(symID), m_type_data_resolved(false),
m_is_synthetic(is_artificial), m_is_debug(is_debug),
m_is_external(external), m_size_is_sibling(false),
m_size_is_synthesized(false), m_size_is_valid(size_is_valid || size > 0),
m_demangled_is_synthesized(false),
m_contains_linker_annotations(contains_linker_annotations),
m_is_weak(false), m_type(type), m_mangled(name),
m_addr_range(section_sp, offset, size), m_flags(flags) {}
Symbol::Symbol(uint32_t symID, const Mangled &mangled, SymbolType type,
bool external, bool is_debug, bool is_trampoline,
bool is_artificial, const AddressRange &range,
bool size_is_valid, bool contains_linker_annotations,
uint32_t flags)
: SymbolContextScope(), m_uid(symID), m_type_data_resolved(false),
m_is_synthetic(is_artificial), m_is_debug(is_debug),
m_is_external(external), m_size_is_sibling(false),
m_size_is_synthesized(false),
m_size_is_valid(size_is_valid || range.GetByteSize() > 0),
m_demangled_is_synthesized(false),
m_contains_linker_annotations(contains_linker_annotations),
m_is_weak(false), m_type(type), m_mangled(mangled), m_addr_range(range),
m_flags(flags) {}
Symbol::Symbol(const Symbol &rhs)
: SymbolContextScope(rhs), m_uid(rhs.m_uid), m_type_data(rhs.m_type_data),
m_type_data_resolved(rhs.m_type_data_resolved),
m_is_synthetic(rhs.m_is_synthetic), m_is_debug(rhs.m_is_debug),
m_is_external(rhs.m_is_external),
m_size_is_sibling(rhs.m_size_is_sibling), m_size_is_synthesized(false),
m_size_is_valid(rhs.m_size_is_valid),
m_demangled_is_synthesized(rhs.m_demangled_is_synthesized),
m_contains_linker_annotations(rhs.m_contains_linker_annotations),
m_is_weak(rhs.m_is_weak), m_type(rhs.m_type), m_mangled(rhs.m_mangled),
m_addr_range(rhs.m_addr_range), m_flags(rhs.m_flags) {}
const Symbol &Symbol::operator=(const Symbol &rhs) {
if (this != &rhs) {
SymbolContextScope::operator=(rhs);
m_uid = rhs.m_uid;
m_type_data = rhs.m_type_data;
m_type_data_resolved = rhs.m_type_data_resolved;
m_is_synthetic = rhs.m_is_synthetic;
m_is_debug = rhs.m_is_debug;
m_is_external = rhs.m_is_external;
m_size_is_sibling = rhs.m_size_is_sibling;
m_size_is_synthesized = rhs.m_size_is_sibling;
m_size_is_valid = rhs.m_size_is_valid;
m_demangled_is_synthesized = rhs.m_demangled_is_synthesized;
m_contains_linker_annotations = rhs.m_contains_linker_annotations;
m_is_weak = rhs.m_is_weak;
m_type = rhs.m_type;
m_mangled = rhs.m_mangled;
m_addr_range = rhs.m_addr_range;
m_flags = rhs.m_flags;
}
return *this;
}
void Symbol::Clear() {
m_uid = UINT32_MAX;
m_mangled.Clear();
m_type_data = 0;
m_type_data_resolved = false;
m_is_synthetic = false;
m_is_debug = false;
m_is_external = false;
m_size_is_sibling = false;
m_size_is_synthesized = false;
m_size_is_valid = false;
m_demangled_is_synthesized = false;
m_contains_linker_annotations = false;
m_is_weak = false;
m_type = eSymbolTypeInvalid;
m_flags = 0;
m_addr_range.Clear();
}
bool Symbol::ValueIsAddress() const {
return m_addr_range.GetBaseAddress().GetSection().get() != nullptr ||
m_type == eSymbolTypeAbsolute;
}
ConstString Symbol::GetDisplayName() const {
return GetMangled().GetDisplayDemangledName();
}
ConstString Symbol::GetReExportedSymbolName() const {
if (m_type == eSymbolTypeReExported) {
// For eSymbolTypeReExported, the "const char *" from a ConstString is used
// as the offset in the address range base address. We can then make this
// back into a string that is the re-exported name.
intptr_t str_ptr = m_addr_range.GetBaseAddress().GetOffset();
if (str_ptr != 0)
return ConstString((const char *)str_ptr);
else
return GetName();
}
return ConstString();
}
FileSpec Symbol::GetReExportedSymbolSharedLibrary() const {
if (m_type == eSymbolTypeReExported) {
// For eSymbolTypeReExported, the "const char *" from a ConstString is used
// as the offset in the address range base address. We can then make this
// back into a string that is the re-exported name.
intptr_t str_ptr = m_addr_range.GetByteSize();
if (str_ptr != 0)
return FileSpec((const char *)str_ptr);
}
return FileSpec();
}
void Symbol::SetReExportedSymbolName(ConstString name) {
SetType(eSymbolTypeReExported);
// For eSymbolTypeReExported, the "const char *" from a ConstString is used
// as the offset in the address range base address.
m_addr_range.GetBaseAddress().SetOffset((uintptr_t)name.GetCString());
}
bool Symbol::SetReExportedSymbolSharedLibrary(const FileSpec &fspec) {
if (m_type == eSymbolTypeReExported) {
// For eSymbolTypeReExported, the "const char *" from a ConstString is used
// as the offset in the address range base address.
m_addr_range.SetByteSize(
(uintptr_t)ConstString(fspec.GetPath().c_str()).GetCString());
return true;
}
return false;
}
uint32_t Symbol::GetSiblingIndex() const {
return m_size_is_sibling ? m_addr_range.GetByteSize() : UINT32_MAX;
}
bool Symbol::IsTrampoline() const { return m_type == eSymbolTypeTrampoline; }
bool Symbol::IsIndirect() const { return m_type == eSymbolTypeResolver; }
void Symbol::GetDescription(Stream *s, lldb::DescriptionLevel level,
Target *target) const {
s->Printf("id = {0x%8.8x}", m_uid);
if (m_addr_range.GetBaseAddress().GetSection()) {
if (ValueIsAddress()) {
const lldb::addr_t byte_size = GetByteSize();
if (byte_size > 0) {
s->PutCString(", range = ");
m_addr_range.Dump(s, target, Address::DumpStyleLoadAddress,
Address::DumpStyleFileAddress);
} else {
s->PutCString(", address = ");
m_addr_range.GetBaseAddress().Dump(s, target,
Address::DumpStyleLoadAddress,
Address::DumpStyleFileAddress);
}
} else
s->Printf(", value = 0x%16.16" PRIx64,
m_addr_range.GetBaseAddress().GetOffset());
} else {
if (m_size_is_sibling)
s->Printf(", sibling = %5" PRIu64,
m_addr_range.GetBaseAddress().GetOffset());
else
s->Printf(", value = 0x%16.16" PRIx64,
m_addr_range.GetBaseAddress().GetOffset());
}
ConstString demangled = GetMangled().GetDemangledName();
if (demangled)
s->Printf(", name=\"%s\"", demangled.AsCString());
if (m_mangled.GetMangledName())
s->Printf(", mangled=\"%s\"", m_mangled.GetMangledName().AsCString());
}
void Symbol::Dump(Stream *s, Target *target, uint32_t index,
Mangled::NamePreference name_preference) const {
s->Printf("[%5u] %6u %c%c%c %-15s ", index, GetID(), m_is_debug ? 'D' : ' ',
m_is_synthetic ? 'S' : ' ', m_is_external ? 'X' : ' ',
GetTypeAsString());
// Make sure the size of the symbol is up to date before dumping
GetByteSize();
ConstString name = GetMangled().GetName(name_preference);
if (ValueIsAddress()) {
if (!m_addr_range.GetBaseAddress().Dump(s, nullptr,
Address::DumpStyleFileAddress))
s->Printf("%*s", 18, "");
s->PutChar(' ');
if (!m_addr_range.GetBaseAddress().Dump(s, target,
Address::DumpStyleLoadAddress))
s->Printf("%*s", 18, "");
const char *format = m_size_is_sibling ? " Sibling -> [%5llu] 0x%8.8x %s\n"
: " 0x%16.16" PRIx64 " 0x%8.8x %s\n";
s->Printf(format, GetByteSize(), m_flags, name.AsCString(""));
} else if (m_type == eSymbolTypeReExported) {
s->Printf(
" 0x%8.8x %s",
m_flags, name.AsCString(""));
ConstString reexport_name = GetReExportedSymbolName();
intptr_t shlib = m_addr_range.GetByteSize();
if (shlib)
s->Printf(" -> %s`%s\n", (const char *)shlib, reexport_name.GetCString());
else
s->Printf(" -> %s\n", reexport_name.GetCString());
} else {
const char *format =
m_size_is_sibling
? "0x%16.16" PRIx64
" Sibling -> [%5llu] 0x%8.8x %s\n"
: "0x%16.16" PRIx64 " 0x%16.16" PRIx64
" 0x%8.8x %s\n";
s->Printf(format, m_addr_range.GetBaseAddress().GetOffset(), GetByteSize(),
m_flags, name.AsCString(""));
}
}
uint32_t Symbol::GetPrologueByteSize() {
if (m_type == eSymbolTypeCode || m_type == eSymbolTypeResolver) {
if (!m_type_data_resolved) {
m_type_data_resolved = true;
const Address &base_address = m_addr_range.GetBaseAddress();
Function *function = base_address.CalculateSymbolContextFunction();
if (function) {
// Functions have line entries which can also potentially have end of
// prologue information. So if this symbol points to a function, use
// the prologue information from there.
m_type_data = function->GetPrologueByteSize();
} else {
ModuleSP module_sp(base_address.GetModule());
SymbolContext sc;
if (module_sp) {
uint32_t resolved_flags = module_sp->ResolveSymbolContextForAddress(
base_address, eSymbolContextLineEntry, sc);
if (resolved_flags & eSymbolContextLineEntry) {
// Default to the end of the first line entry.
m_type_data = sc.line_entry.range.GetByteSize();
// Set address for next line.
Address addr(base_address);
addr.Slide(m_type_data);
// Check the first few instructions and look for one that has a
// line number that is different than the first entry. This is also
// done in Function::GetPrologueByteSize().
uint16_t total_offset = m_type_data;
for (int idx = 0; idx < 6; ++idx) {
SymbolContext sc_temp;
resolved_flags = module_sp->ResolveSymbolContextForAddress(
addr, eSymbolContextLineEntry, sc_temp);
// Make sure we got line number information...
if (!(resolved_flags & eSymbolContextLineEntry))
break;
// If this line number is different than our first one, use it
// and we're done.
if (sc_temp.line_entry.line != sc.line_entry.line) {
m_type_data = total_offset;
break;
}
// Slide addr up to the next line address.
addr.Slide(sc_temp.line_entry.range.GetByteSize());
total_offset += sc_temp.line_entry.range.GetByteSize();
// If we've gone too far, bail out.
if (total_offset >= m_addr_range.GetByteSize())
break;
}
// Sanity check - this may be a function in the middle of code that
// has debug information, but not for this symbol. So the line
// entries surrounding us won't lie inside our function. In that
// case, the line entry will be bigger than we are, so we do that
// quick check and if that is true, we just return 0.
if (m_type_data >= m_addr_range.GetByteSize())
m_type_data = 0;
} else {
// TODO: expose something in Process to figure out the
// size of a function prologue.
m_type_data = 0;
}
}
}
}
return m_type_data;
}
return 0;
}
bool Symbol::Compare(ConstString name, SymbolType type) const {
if (type == eSymbolTypeAny || m_type == type) {
const Mangled &mangled = GetMangled();
return mangled.GetMangledName() == name ||
mangled.GetDemangledName() == name;
}
return false;
}
#define ENUM_TO_CSTRING(x) \
case eSymbolType##x: \
return #x;
const char *Symbol::GetTypeAsString() const {
switch (m_type) {
ENUM_TO_CSTRING(Invalid);
ENUM_TO_CSTRING(Absolute);
ENUM_TO_CSTRING(Code);
ENUM_TO_CSTRING(Resolver);
ENUM_TO_CSTRING(Data);
ENUM_TO_CSTRING(Trampoline);
ENUM_TO_CSTRING(Runtime);
ENUM_TO_CSTRING(Exception);
ENUM_TO_CSTRING(SourceFile);
ENUM_TO_CSTRING(HeaderFile);
ENUM_TO_CSTRING(ObjectFile);
ENUM_TO_CSTRING(CommonBlock);
ENUM_TO_CSTRING(Block);
ENUM_TO_CSTRING(Local);
ENUM_TO_CSTRING(Param);
ENUM_TO_CSTRING(Variable);
ENUM_TO_CSTRING(VariableType);
ENUM_TO_CSTRING(LineEntry);
ENUM_TO_CSTRING(LineHeader);
ENUM_TO_CSTRING(ScopeBegin);
ENUM_TO_CSTRING(ScopeEnd);
ENUM_TO_CSTRING(Additional);
ENUM_TO_CSTRING(Compiler);
ENUM_TO_CSTRING(Instrumentation);
ENUM_TO_CSTRING(Undefined);
ENUM_TO_CSTRING(ObjCClass);
ENUM_TO_CSTRING(ObjCMetaClass);
ENUM_TO_CSTRING(ObjCIVar);
ENUM_TO_CSTRING(ReExported);
default:
break;
}
return "<unknown SymbolType>";
}
void Symbol::CalculateSymbolContext(SymbolContext *sc) {
// Symbols can reconstruct the symbol and the module in the symbol context
sc->symbol = this;
if (ValueIsAddress())
sc->module_sp = GetAddressRef().GetModule();
else
sc->module_sp.reset();
}
ModuleSP Symbol::CalculateSymbolContextModule() {
if (ValueIsAddress())
return GetAddressRef().GetModule();
return ModuleSP();
}
Symbol *Symbol::CalculateSymbolContextSymbol() { return this; }
void Symbol::DumpSymbolContext(Stream *s) {
bool dumped_module = false;
if (ValueIsAddress()) {
ModuleSP module_sp(GetAddressRef().GetModule());
if (module_sp) {
dumped_module = true;
module_sp->DumpSymbolContext(s);
}
}
if (dumped_module)
s->PutCString(", ");
s->Printf("Symbol{0x%8.8x}", GetID());
}
lldb::addr_t Symbol::GetByteSize() const { return m_addr_range.GetByteSize(); }
Symbol *Symbol::ResolveReExportedSymbolInModuleSpec(
Target &target, ConstString &reexport_name, ModuleSpec &module_spec,
ModuleList &seen_modules) const {
ModuleSP module_sp;
if (module_spec.GetFileSpec()) {
// Try searching for the module file spec first using the full path
module_sp = target.GetImages().FindFirstModule(module_spec);
if (!module_sp) {
// Next try and find the module by basename in case environment variables
// or other runtime trickery causes shared libraries to be loaded from
// alternate paths
module_spec.GetFileSpec().GetDirectory().Clear();
module_sp = target.GetImages().FindFirstModule(module_spec);
}
}
if (module_sp) {
// There should not be cycles in the reexport list, but we don't want to
// crash if there are so make sure we haven't seen this before:
if (!seen_modules.AppendIfNeeded(module_sp))
return nullptr;
lldb_private::SymbolContextList sc_list;
module_sp->FindSymbolsWithNameAndType(reexport_name, eSymbolTypeAny,
sc_list);
const size_t num_scs = sc_list.GetSize();
if (num_scs > 0) {
for (size_t i = 0; i < num_scs; ++i) {
lldb_private::SymbolContext sc;
if (sc_list.GetContextAtIndex(i, sc)) {
if (sc.symbol->IsExternal())
return sc.symbol;
}
}
}
// If we didn't find the symbol in this module, it may be because this
// module re-exports some whole other library. We have to search those as
// well:
seen_modules.Append(module_sp);
FileSpecList reexported_libraries =
module_sp->GetObjectFile()->GetReExportedLibraries();
size_t num_reexported_libraries = reexported_libraries.GetSize();
for (size_t idx = 0; idx < num_reexported_libraries; idx++) {
ModuleSpec reexported_module_spec;
reexported_module_spec.GetFileSpec() =
reexported_libraries.GetFileSpecAtIndex(idx);
Symbol *result_symbol = ResolveReExportedSymbolInModuleSpec(
target, reexport_name, reexported_module_spec, seen_modules);
if (result_symbol)
return result_symbol;
}
}
return nullptr;
}
Symbol *Symbol::ResolveReExportedSymbol(Target &target) const {
ConstString reexport_name(GetReExportedSymbolName());
if (reexport_name) {
ModuleSpec module_spec;
ModuleList seen_modules;
module_spec.GetFileSpec() = GetReExportedSymbolSharedLibrary();
if (module_spec.GetFileSpec()) {
return ResolveReExportedSymbolInModuleSpec(target, reexport_name,
module_spec, seen_modules);
}
}
return nullptr;
}
lldb::addr_t Symbol::GetFileAddress() const {
if (ValueIsAddress())
return GetAddressRef().GetFileAddress();
else
return LLDB_INVALID_ADDRESS;
}
lldb::addr_t Symbol::GetLoadAddress(Target *target) const {
if (ValueIsAddress())
return GetAddressRef().GetLoadAddress(target);
else
return LLDB_INVALID_ADDRESS;
}
ConstString Symbol::GetName() const { return GetMangled().GetName(); }
ConstString Symbol::GetNameNoArguments() const {
return GetMangled().GetName(Mangled::ePreferDemangledWithoutArguments);
}
lldb::addr_t Symbol::ResolveCallableAddress(Target &target) const {
if (GetType() == lldb::eSymbolTypeUndefined)
return LLDB_INVALID_ADDRESS;
Address func_so_addr;
bool is_indirect = IsIndirect();
if (GetType() == eSymbolTypeReExported) {
Symbol *reexported_symbol = ResolveReExportedSymbol(target);
if (reexported_symbol) {
func_so_addr = reexported_symbol->GetAddress();
is_indirect = reexported_symbol->IsIndirect();
}
} else {
func_so_addr = GetAddress();
is_indirect = IsIndirect();
}
if (func_so_addr.IsValid()) {
if (!target.GetProcessSP() && is_indirect) {
// can't resolve indirect symbols without calling a function...
return LLDB_INVALID_ADDRESS;
}
lldb::addr_t load_addr =
func_so_addr.GetCallableLoadAddress(&target, is_indirect);
if (load_addr != LLDB_INVALID_ADDRESS) {
return load_addr;
}
}
return LLDB_INVALID_ADDRESS;
}
lldb::DisassemblerSP Symbol::GetInstructions(const ExecutionContext &exe_ctx,
const char *flavor,
bool prefer_file_cache) {
ModuleSP module_sp(m_addr_range.GetBaseAddress().GetModule());
if (module_sp && exe_ctx.HasTargetScope()) {
return Disassembler::DisassembleRange(module_sp->GetArchitecture(), nullptr,
flavor, exe_ctx.GetTargetRef(),
m_addr_range, !prefer_file_cache);
}
return lldb::DisassemblerSP();
}
bool Symbol::GetDisassembly(const ExecutionContext &exe_ctx, const char *flavor,
bool prefer_file_cache, Stream &strm) {
lldb::DisassemblerSP disassembler_sp =
GetInstructions(exe_ctx, flavor, prefer_file_cache);
if (disassembler_sp) {
const bool show_address = true;
const bool show_bytes = false;
disassembler_sp->GetInstructionList().Dump(&strm, show_address, show_bytes,
&exe_ctx);
return true;
}
return false;
}
bool Symbol::ContainsFileAddress(lldb::addr_t file_addr) const {
return m_addr_range.ContainsFileAddress(file_addr);
}
bool Symbol::IsSyntheticWithAutoGeneratedName() const {
if (!IsSynthetic())
return false;
if (!m_mangled)
return true;
ConstString demangled = m_mangled.GetDemangledName();
return demangled.GetStringRef().startswith(GetSyntheticSymbolPrefix());
}
void Symbol::SynthesizeNameIfNeeded() const {
if (m_is_synthetic && !m_mangled) {
// Synthetic symbol names don't mean anything, but they do uniquely
// identify individual symbols so we give them a unique name. The name
// starts with the synthetic symbol prefix, followed by a unique number.
// Typically the UserID of a real symbol is the symbol table index of the
// symbol in the object file's symbol table(s), so it will be the same
// every time you read in the object file. We want the same persistence for
// synthetic symbols so that users can identify them across multiple debug
// sessions, to understand crashes in those symbols and to reliably set
// breakpoints on them.
llvm::SmallString<256> name;
llvm::raw_svector_ostream os(name);
os << GetSyntheticSymbolPrefix() << GetID();
m_mangled.SetDemangledName(ConstString(os.str()));
}
}
bool Symbol::Decode(const DataExtractor &data, lldb::offset_t *offset_ptr,
const SectionList *section_list,
const StringTableReader &strtab) {
if (!data.ValidOffsetForDataOfSize(*offset_ptr, 8))
return false;
m_uid = data.GetU32(offset_ptr);
m_type_data = data.GetU16(offset_ptr);
const uint16_t bitfields = data.GetU16(offset_ptr);
m_type_data_resolved = (1u << 15 & bitfields) != 0;
m_is_synthetic = (1u << 14 & bitfields) != 0;
m_is_debug = (1u << 13 & bitfields) != 0;
m_is_external = (1u << 12 & bitfields) != 0;
m_size_is_sibling = (1u << 11 & bitfields) != 0;
m_size_is_synthesized = (1u << 10 & bitfields) != 0;
m_size_is_valid = (1u << 9 & bitfields) != 0;
m_demangled_is_synthesized = (1u << 8 & bitfields) != 0;
m_contains_linker_annotations = (1u << 7 & bitfields) != 0;
m_is_weak = (1u << 6 & bitfields) != 0;
m_type = bitfields & 0x003f;
if (!m_mangled.Decode(data, offset_ptr, strtab))
return false;
if (!data.ValidOffsetForDataOfSize(*offset_ptr, 20))
return false;
const bool is_addr = data.GetU8(offset_ptr) != 0;
const uint64_t value = data.GetU64(offset_ptr);
if (is_addr) {
m_addr_range.GetBaseAddress().ResolveAddressUsingFileSections(
value, section_list);
} else {
m_addr_range.GetBaseAddress().Clear();
m_addr_range.GetBaseAddress().SetOffset(value);
}
m_addr_range.SetByteSize(data.GetU64(offset_ptr));
m_flags = data.GetU32(offset_ptr);
return true;
}
/// The encoding format for the symbol is as follows:
///
/// uint32_t m_uid;
/// uint16_t m_type_data;
/// uint16_t bitfield_data;
/// Mangled mangled;
/// uint8_t is_addr;
/// uint64_t file_addr_or_value;
/// uint64_t size;
/// uint32_t flags;
///
/// The only tricky thing in this encoding is encoding all of the bits in the
/// bitfields. We use a trick to store all bitfields as a 16 bit value and we
/// do the same thing when decoding the symbol. There are test that ensure this
/// encoding works for each individual bit. Everything else is very easy to
/// store.
void Symbol::Encode(DataEncoder &file, ConstStringTable &strtab) const {
file.AppendU32(m_uid);
file.AppendU16(m_type_data);
uint16_t bitfields = m_type;
if (m_type_data_resolved)
bitfields |= 1u << 15;
if (m_is_synthetic)
bitfields |= 1u << 14;
if (m_is_debug)
bitfields |= 1u << 13;
if (m_is_external)
bitfields |= 1u << 12;
if (m_size_is_sibling)
bitfields |= 1u << 11;
if (m_size_is_synthesized)
bitfields |= 1u << 10;
if (m_size_is_valid)
bitfields |= 1u << 9;
if (m_demangled_is_synthesized)
bitfields |= 1u << 8;
if (m_contains_linker_annotations)
bitfields |= 1u << 7;
if (m_is_weak)
bitfields |= 1u << 6;
file.AppendU16(bitfields);
m_mangled.Encode(file, strtab);
// A symbol's value might be an address, or it might be a constant. If the
// symbol's base address doesn't have a section, then it is a constant value.
// If it does have a section, we will encode the file address and re-resolve
// the address when we decode it.
bool is_addr = m_addr_range.GetBaseAddress().GetSection().get() != nullptr;
file.AppendU8(is_addr);
file.AppendU64(m_addr_range.GetBaseAddress().GetFileAddress());
file.AppendU64(m_addr_range.GetByteSize());
file.AppendU32(m_flags);
}
bool Symbol::operator==(const Symbol &rhs) const {
if (m_uid != rhs.m_uid)
return false;
if (m_type_data != rhs.m_type_data)
return false;
if (m_type_data_resolved != rhs.m_type_data_resolved)
return false;
if (m_is_synthetic != rhs.m_is_synthetic)
return false;
if (m_is_debug != rhs.m_is_debug)
return false;
if (m_is_external != rhs.m_is_external)
return false;
if (m_size_is_sibling != rhs.m_size_is_sibling)
return false;
if (m_size_is_synthesized != rhs.m_size_is_synthesized)
return false;
if (m_size_is_valid != rhs.m_size_is_valid)
return false;
if (m_demangled_is_synthesized != rhs.m_demangled_is_synthesized)
return false;
if (m_contains_linker_annotations != rhs.m_contains_linker_annotations)
return false;
if (m_is_weak != rhs.m_is_weak)
return false;
if (m_type != rhs.m_type)
return false;
if (m_mangled != rhs.m_mangled)
return false;
if (m_addr_range.GetBaseAddress() != rhs.m_addr_range.GetBaseAddress())
return false;
if (m_addr_range.GetByteSize() != rhs.m_addr_range.GetByteSize())
return false;
if (m_flags != rhs.m_flags)
return false;
return true;
}
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