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//===- SymbolicFile.h - Interface that only provides symbols ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the SymbolicFile interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_SYMBOLICFILE_H
#define LLVM_OBJECT_SYMBOLICFILE_H
#include "llvm/Object/Binary.h"
namespace llvm {
namespace object {
union DataRefImpl {
// This entire union should probably be a
// char[max(8, sizeof(uintptr_t))] and require the impl to cast.
struct {
uint32_t a, b;
} d;
uintptr_t p;
DataRefImpl() { std::memset(this, 0, sizeof(DataRefImpl)); }
};
inline bool operator==(const DataRefImpl &a, const DataRefImpl &b) {
// Check bitwise identical. This is the only legal way to compare a union w/o
// knowing which member is in use.
return std::memcmp(&a, &b, sizeof(DataRefImpl)) == 0;
}
inline bool operator!=(const DataRefImpl &a, const DataRefImpl &b) {
return !operator==(a, b);
}
inline bool operator<(const DataRefImpl &a, const DataRefImpl &b) {
// Check bitwise identical. This is the only legal way to compare a union w/o
// knowing which member is in use.
return std::memcmp(&a, &b, sizeof(DataRefImpl)) < 0;
}
template <class content_type> class content_iterator {
content_type Current;
public:
content_iterator(content_type symb) : Current(symb) {}
const content_type *operator->() const { return &Current; }
const content_type &operator*() const { return Current; }
bool operator==(const content_iterator &other) const {
return Current == other.Current;
}
bool operator!=(const content_iterator &other) const {
return !(*this == other);
}
content_iterator &operator++() { // preincrement
Current.moveNext();
return *this;
}
};
class SymbolicFile;
/// This is a value type class that represents a single symbol in the list of
/// symbols in the object file.
class BasicSymbolRef {
DataRefImpl SymbolPimpl;
const SymbolicFile *OwningObject;
public:
// FIXME: should we add a SF_Text?
enum Flags : unsigned {
SF_None = 0,
SF_Undefined = 1U << 0, // Symbol is defined in another object file
SF_Global = 1U << 1, // Global symbol
SF_Weak = 1U << 2, // Weak symbol
SF_Absolute = 1U << 3, // Absolute symbol
SF_Common = 1U << 4, // Symbol has common linkage
SF_Indirect = 1U << 5, // Symbol is an alias to another symbol
SF_Exported = 1U << 6, // Symbol is visible to other DSOs
SF_FormatSpecific = 1U << 7, // Specific to the object file format
// (e.g. section symbols)
SF_Thumb = 1U << 8, // Thumb symbol in a 32-bit ARM binary
};
BasicSymbolRef() : OwningObject(nullptr) { }
BasicSymbolRef(DataRefImpl SymbolP, const SymbolicFile *Owner);
bool operator==(const BasicSymbolRef &Other) const;
bool operator<(const BasicSymbolRef &Other) const;
void moveNext();
std::error_code printName(raw_ostream &OS) const;
/// Get symbol flags (bitwise OR of SymbolRef::Flags)
uint32_t getFlags() const;
DataRefImpl getRawDataRefImpl() const;
const SymbolicFile *getObject() const;
};
typedef content_iterator<BasicSymbolRef> basic_symbol_iterator;
const uint64_t UnknownAddressOrSize = ~0ULL;
class SymbolicFile : public Binary {
public:
virtual ~SymbolicFile();
SymbolicFile(unsigned int Type, MemoryBufferRef Source);
// virtual interface.
virtual void moveSymbolNext(DataRefImpl &Symb) const = 0;
virtual std::error_code printSymbolName(raw_ostream &OS,
DataRefImpl Symb) const = 0;
virtual uint32_t getSymbolFlags(DataRefImpl Symb) const = 0;
virtual basic_symbol_iterator symbol_begin_impl() const = 0;
virtual basic_symbol_iterator symbol_end_impl() const = 0;
// convenience wrappers.
basic_symbol_iterator symbol_begin() const {
return symbol_begin_impl();
}
basic_symbol_iterator symbol_end() const {
return symbol_end_impl();
}
typedef iterator_range<basic_symbol_iterator> basic_symbol_iterator_range;
basic_symbol_iterator_range symbols() const {
return basic_symbol_iterator_range(symbol_begin(), symbol_end());
}
// construction aux.
static ErrorOr<std::unique_ptr<SymbolicFile>>
createSymbolicFile(MemoryBufferRef Object, sys::fs::file_magic Type,
LLVMContext *Context);
static ErrorOr<std::unique_ptr<SymbolicFile>>
createSymbolicFile(MemoryBufferRef Object) {
return createSymbolicFile(Object, sys::fs::file_magic::unknown, nullptr);
}
static ErrorOr<OwningBinary<SymbolicFile>>
createSymbolicFile(StringRef ObjectPath);
static inline bool classof(const Binary *v) {
return v->isSymbolic();
}
};
inline BasicSymbolRef::BasicSymbolRef(DataRefImpl SymbolP,
const SymbolicFile *Owner)
: SymbolPimpl(SymbolP), OwningObject(Owner) {}
inline bool BasicSymbolRef::operator==(const BasicSymbolRef &Other) const {
return SymbolPimpl == Other.SymbolPimpl;
}
inline bool BasicSymbolRef::operator<(const BasicSymbolRef &Other) const {
return SymbolPimpl < Other.SymbolPimpl;
}
inline void BasicSymbolRef::moveNext() {
return OwningObject->moveSymbolNext(SymbolPimpl);
}
inline std::error_code BasicSymbolRef::printName(raw_ostream &OS) const {
return OwningObject->printSymbolName(OS, SymbolPimpl);
}
inline uint32_t BasicSymbolRef::getFlags() const {
return OwningObject->getSymbolFlags(SymbolPimpl);
}
inline DataRefImpl BasicSymbolRef::getRawDataRefImpl() const {
return SymbolPimpl;
}
inline const SymbolicFile *BasicSymbolRef::getObject() const {
return OwningObject;
}
}
}
#endif
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