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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207911 91177308-0d34-0410-b5e6-96231b3b80d8
217 lines
7.3 KiB
C++
217 lines
7.3 KiB
C++
//===-LTOModule.h - LLVM Link Time Optimizer ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the LTOModule class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LTO_MODULE_H
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#define LTO_MODULE_H
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#include "llvm-c/lto.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include <string>
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#include <vector>
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// Forward references to llvm classes.
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namespace llvm {
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class Function;
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class GlobalValue;
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class MemoryBuffer;
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class TargetOptions;
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class Value;
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//===----------------------------------------------------------------------===//
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/// C++ class which implements the opaque lto_module_t type.
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///
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struct LTOModule {
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private:
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typedef StringMap<uint8_t> StringSet;
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struct NameAndAttributes {
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const char *name;
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uint32_t attributes;
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bool isFunction;
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const GlobalValue *symbol;
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};
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std::unique_ptr<Module> _module;
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std::unique_ptr<TargetMachine> _target;
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MCObjectFileInfo ObjFileInfo;
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StringSet _linkeropt_strings;
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std::vector<const char *> _deplibs;
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std::vector<const char *> _linkeropts;
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std::vector<NameAndAttributes> _symbols;
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// _defines and _undefines only needed to disambiguate tentative definitions
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StringSet _defines;
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StringMap<NameAndAttributes> _undefines;
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std::vector<const char*> _asm_undefines;
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MCContext _context;
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// Use mangler to add GlobalPrefix to names to match linker names.
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Mangler _mangler;
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LTOModule(Module *m, TargetMachine *t);
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public:
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/// Returns 'true' if the file or memory contents is LLVM bitcode.
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static bool isBitcodeFile(const void *mem, size_t length);
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static bool isBitcodeFile(const char *path);
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/// Returns 'true' if the file or memory contents is LLVM bitcode for the
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/// specified triple.
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static bool isBitcodeFileForTarget(const void *mem,
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size_t length,
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const char *triplePrefix);
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static bool isBitcodeFileForTarget(const char *path,
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const char *triplePrefix);
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/// Create an LTOModule. N.B. These methods take ownership of the buffer. The
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/// caller must have initialized the Targets, the TargetMCs, the AsmPrinters,
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/// and the AsmParsers by calling:
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///
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/// InitializeAllTargets();
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/// InitializeAllTargetMCs();
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/// InitializeAllAsmPrinters();
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/// InitializeAllAsmParsers();
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static LTOModule *makeLTOModule(const char *path, TargetOptions options,
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std::string &errMsg);
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static LTOModule *makeLTOModule(int fd, const char *path, size_t size,
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TargetOptions options, std::string &errMsg);
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static LTOModule *makeLTOModule(int fd, const char *path, size_t map_size,
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off_t offset, TargetOptions options,
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std::string &errMsg);
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static LTOModule *makeLTOModule(const void *mem, size_t length,
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TargetOptions options, std::string &errMsg,
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StringRef path = "");
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/// Return the Module's target triple.
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const char *getTargetTriple() {
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return _module->getTargetTriple().c_str();
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}
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/// Set the Module's target triple.
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void setTargetTriple(const char *triple) {
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_module->setTargetTriple(triple);
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}
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/// Get the number of symbols
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uint32_t getSymbolCount() {
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return _symbols.size();
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}
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/// Get the attributes for a symbol at the specified index.
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lto_symbol_attributes getSymbolAttributes(uint32_t index) {
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if (index < _symbols.size())
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return lto_symbol_attributes(_symbols[index].attributes);
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return lto_symbol_attributes(0);
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}
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/// Get the name of the symbol at the specified index.
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const char *getSymbolName(uint32_t index) {
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if (index < _symbols.size())
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return _symbols[index].name;
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return nullptr;
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}
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/// Get the number of dependent libraries
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uint32_t getDependentLibraryCount() {
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return _deplibs.size();
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}
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/// Get the dependent library at the specified index.
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const char *getDependentLibrary(uint32_t index) {
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if (index < _deplibs.size())
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return _deplibs[index];
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return nullptr;
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}
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/// Get the number of linker options
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uint32_t getLinkerOptCount() {
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return _linkeropts.size();
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}
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/// Get the linker option at the specified index.
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const char *getLinkerOpt(uint32_t index) {
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if (index < _linkeropts.size())
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return _linkeropts[index];
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return nullptr;
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}
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/// Return the Module.
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Module *getLLVVMModule() { return _module.get(); }
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const std::vector<const char*> &getAsmUndefinedRefs() {
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return _asm_undefines;
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}
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private:
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/// Parse metadata from the module
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// FIXME: it only parses "Linker Options" metadata at the moment
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void parseMetadata();
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/// Parse the symbols from the module and model-level ASM and add them to
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/// either the defined or undefined lists.
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bool parseSymbols(std::string &errMsg);
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/// Add a symbol which isn't defined just yet to a list to be resolved later.
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void addPotentialUndefinedSymbol(const GlobalValue *dcl, bool isFunc);
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/// Add a defined symbol to the list.
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void addDefinedSymbol(const GlobalValue *def, bool isFunction);
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/// Add a function symbol as defined to the list.
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void addDefinedFunctionSymbol(const Function *f);
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/// Add a data symbol as defined to the list.
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void addDefinedDataSymbol(const GlobalValue *v);
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/// Add global symbols from module-level ASM to the defined or undefined
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/// lists.
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bool addAsmGlobalSymbols(std::string &errMsg);
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/// Add a global symbol from module-level ASM to the defined list.
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void addAsmGlobalSymbol(const char *, lto_symbol_attributes scope);
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/// Add a global symbol from module-level ASM to the undefined list.
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void addAsmGlobalSymbolUndef(const char *);
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/// Parse i386/ppc ObjC class data structure.
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void addObjCClass(const GlobalVariable *clgv);
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/// Parse i386/ppc ObjC category data structure.
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void addObjCCategory(const GlobalVariable *clgv);
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/// Parse i386/ppc ObjC class list data structure.
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void addObjCClassRef(const GlobalVariable *clgv);
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/// Get string that the data pointer points to.
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bool objcClassNameFromExpression(const Constant *c, std::string &name);
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/// Returns 'true' if the memory buffer is for the specified target triple.
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static bool isTargetMatch(MemoryBuffer *memBuffer, const char *triplePrefix);
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/// Create an LTOModule (private version). N.B. This method takes ownership of
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/// the buffer.
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static LTOModule *makeLTOModule(MemoryBuffer *buffer, TargetOptions options,
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std::string &errMsg);
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/// Create a MemoryBuffer from a memory range with an optional name.
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static MemoryBuffer *makeBuffer(const void *mem, size_t length,
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StringRef name = "");
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};
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}
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#endif // LTO_MODULE_H
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