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7f301833ee
uses. The result produced by the streamer is used to give the linker more accurate information and to add to llvm.compiler.used. The second improvement removes the need for the user to add __attribute__((used)) to functions only used in inline asm. The first one lets us build firefox with LTO on Darwin :-) llvm-svn: 126830
121 lines
4.8 KiB
C++
121 lines
4.8 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/Module.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm-c/lto.h"
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#include <vector>
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#include <string>
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// forward references to llvm classes
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namespace llvm {
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class Mangler;
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class MemoryBuffer;
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class GlobalValue;
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class Value;
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class Function;
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}
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//
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// C++ class which implements the opaque lto_module_t
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//
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struct LTOModule {
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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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static bool isBitcodeFileForTarget(const void* mem,
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size_t length, const char* triplePrefix);
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static bool isBitcodeFileForTarget(const char* path,
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const char* triplePrefix);
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static LTOModule* makeLTOModule(const char* path,
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std::string& errMsg);
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static LTOModule* makeLTOModule(int fd, const char *path,
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off_t size,
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std::string& errMsg);
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static LTOModule* makeLTOModule(const void* mem, size_t length,
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std::string& errMsg);
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const char* getTargetTriple();
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void setTargetTriple(const char*);
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uint32_t getSymbolCount();
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lto_symbol_attributes getSymbolAttributes(uint32_t index);
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const char* getSymbolName(uint32_t index);
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llvm::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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LTOModule(llvm::Module* m, llvm::TargetMachine* t);
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bool ParseSymbols();
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void addDefinedSymbol(llvm::GlobalValue* def,
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llvm::Mangler& mangler,
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bool isFunction);
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void addPotentialUndefinedSymbol(llvm::GlobalValue* decl,
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llvm::Mangler &mangler);
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void findExternalRefs(llvm::Value* value,
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llvm::Mangler& mangler);
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void addDefinedFunctionSymbol(llvm::Function* f,
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llvm::Mangler &mangler);
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void addDefinedDataSymbol(llvm::GlobalValue* v,
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llvm::Mangler &mangler);
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bool addAsmGlobalSymbols(llvm::MCContext &Context);
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void addAsmGlobalSymbol(const char *,
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lto_symbol_attributes scope);
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void addAsmGlobalSymbolUndef(const char *);
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void addObjCClass(llvm::GlobalVariable* clgv);
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void addObjCCategory(llvm::GlobalVariable* clgv);
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void addObjCClassRef(llvm::GlobalVariable* clgv);
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bool objcClassNameFromExpression(llvm::Constant* c,
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std::string& name);
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static bool isTargetMatch(llvm::MemoryBuffer* memBuffer,
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const char* triplePrefix);
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static LTOModule* makeLTOModule(llvm::MemoryBuffer* buffer,
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std::string& errMsg);
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static llvm::MemoryBuffer* makeBuffer(const void* mem, size_t length);
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typedef llvm::StringMap<uint8_t> StringSet;
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struct NameAndAttributes {
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const char* name;
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lto_symbol_attributes attributes;
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};
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llvm::OwningPtr<llvm::Module> _module;
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llvm::OwningPtr<llvm::TargetMachine> _target;
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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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llvm::StringMap<NameAndAttributes> _undefines;
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std::vector<const char*> _asm_undefines;
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};
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#endif // LTO_MODULE_H
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