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//===-LTOModule.h - LLVM Link Time Optimizer ------------------------------===//
//
// 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 LTOModule class.
//
//===----------------------------------------------------------------------===//
#ifndef LTO_MODULE_H
#define LTO_MODULE_H
#include "llvm-c/lto.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/Target/TargetMachine.h"
#include <string>
#include <vector>
// Forward references to llvm classes.
namespace llvm {
class Function;
class GlobalValue;
class MemoryBuffer;
class TargetOptions;
class Value;
//===----------------------------------------------------------------------===//
/// C++ class which implements the opaque lto_module_t type.
///
struct LTOModule {
private:
typedef StringMap<uint8_t> StringSet;
struct NameAndAttributes {
const char *name;
uint32_t attributes;
bool isFunction;
const GlobalValue *symbol;
};
std::unique_ptr<Module> _module;
std::unique_ptr<TargetMachine> _target;
MCObjectFileInfo ObjFileInfo;
StringSet _linkeropt_strings;
std::vector<const char *> _deplibs;
std::vector<const char *> _linkeropts;
std::vector<NameAndAttributes> _symbols;
// _defines and _undefines only needed to disambiguate tentative definitions
StringSet _defines;
StringMap<NameAndAttributes> _undefines;
std::vector<const char*> _asm_undefines;
MCContext _context;
// Use mangler to add GlobalPrefix to names to match linker names.
Mangler _mangler;
LTOModule(Module *m, TargetMachine *t);
public:
/// Returns 'true' if the file or memory contents is LLVM bitcode.
static bool isBitcodeFile(const void *mem, size_t length);
static bool isBitcodeFile(const char *path);
/// Returns 'true' if the file or memory contents is LLVM bitcode for the
/// specified triple.
static bool isBitcodeFileForTarget(const void *mem,
size_t length,
const char *triplePrefix);
static bool isBitcodeFileForTarget(const char *path,
const char *triplePrefix);
/// Create an LTOModule. N.B. These methods take ownership of the buffer. The
/// caller must have initialized the Targets, the TargetMCs, the AsmPrinters,
/// and the AsmParsers by calling:
///
/// InitializeAllTargets();
/// InitializeAllTargetMCs();
/// InitializeAllAsmPrinters();
/// InitializeAllAsmParsers();
static LTOModule *makeLTOModule(const char *path, TargetOptions options,
std::string &errMsg);
static LTOModule *makeLTOModule(int fd, const char *path, size_t size,
TargetOptions options, std::string &errMsg);
static LTOModule *makeLTOModule(int fd, const char *path, size_t map_size,
off_t offset, TargetOptions options,
std::string &errMsg);
static LTOModule *makeLTOModule(const void *mem, size_t length,
TargetOptions options, std::string &errMsg,
StringRef path = "");
/// Return the Module's target triple.
const char *getTargetTriple() {
return _module->getTargetTriple().c_str();
}
/// Set the Module's target triple.
void setTargetTriple(const char *triple) {
_module->setTargetTriple(triple);
}
/// Get the number of symbols
uint32_t getSymbolCount() {
return _symbols.size();
}
/// Get the attributes for a symbol at the specified index.
lto_symbol_attributes getSymbolAttributes(uint32_t index) {
if (index < _symbols.size())
return lto_symbol_attributes(_symbols[index].attributes);
return lto_symbol_attributes(0);
}
/// Get the name of the symbol at the specified index.
const char *getSymbolName(uint32_t index) {
if (index < _symbols.size())
return _symbols[index].name;
return nullptr;
}
/// Get the number of dependent libraries
uint32_t getDependentLibraryCount() {
return _deplibs.size();
}
/// Get the dependent library at the specified index.
const char *getDependentLibrary(uint32_t index) {
if (index < _deplibs.size())
return _deplibs[index];
return nullptr;
}
/// Get the number of linker options
uint32_t getLinkerOptCount() {
return _linkeropts.size();
}
/// Get the linker option at the specified index.
const char *getLinkerOpt(uint32_t index) {
if (index < _linkeropts.size())
return _linkeropts[index];
return nullptr;
}
/// Return the Module.
Module *getLLVVMModule() { return _module.get(); }
const std::vector<const char*> &getAsmUndefinedRefs() {
return _asm_undefines;
}
private:
/// Parse metadata from the module
// FIXME: it only parses "Linker Options" metadata at the moment
void parseMetadata();
/// Parse the symbols from the module and model-level ASM and add them to
/// either the defined or undefined lists.
bool parseSymbols(std::string &errMsg);
/// Add a symbol which isn't defined just yet to a list to be resolved later.
void addPotentialUndefinedSymbol(const GlobalValue *dcl, bool isFunc);
/// Add a defined symbol to the list.
void addDefinedSymbol(const GlobalValue *def, bool isFunction);
/// Add a function symbol as defined to the list.
void addDefinedFunctionSymbol(const Function *f);
/// Add a data symbol as defined to the list.
void addDefinedDataSymbol(const GlobalValue *v);
/// Add global symbols from module-level ASM to the defined or undefined
/// lists.
bool addAsmGlobalSymbols(std::string &errMsg);
/// Add a global symbol from module-level ASM to the defined list.
void addAsmGlobalSymbol(const char *, lto_symbol_attributes scope);
/// Add a global symbol from module-level ASM to the undefined list.
void addAsmGlobalSymbolUndef(const char *);
/// Parse i386/ppc ObjC class data structure.
void addObjCClass(const GlobalVariable *clgv);
/// Parse i386/ppc ObjC category data structure.
void addObjCCategory(const GlobalVariable *clgv);
/// Parse i386/ppc ObjC class list data structure.
void addObjCClassRef(const GlobalVariable *clgv);
/// Get string that the data pointer points to.
bool objcClassNameFromExpression(const Constant *c, std::string &name);
/// Returns 'true' if the memory buffer is for the specified target triple.
static bool isTargetMatch(MemoryBuffer *memBuffer, const char *triplePrefix);
/// Create an LTOModule (private version). N.B. This method takes ownership of
/// the buffer.
static LTOModule *makeLTOModule(MemoryBuffer *buffer, TargetOptions options,
std::string &errMsg);
/// Create a MemoryBuffer from a memory range with an optional name.
static MemoryBuffer *makeBuffer(const void *mem, size_t length,
StringRef name = "");
};
}
#endif // LTO_MODULE_H
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