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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221728 91177308-0d34-0410-b5e6-96231b3b80d8
164 lines
6.1 KiB
C++
164 lines
6.1 KiB
C++
//===-LTOCodeGenerator.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 LTOCodeGenerator class.
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//
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// LTO compilation consists of three phases: Pre-IPO, IPO and Post-IPO.
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//
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// The Pre-IPO phase compiles source code into bitcode file. The resulting
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// bitcode files, along with object files and libraries, will be fed to the
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// linker to through the IPO and Post-IPO phases. By using obj-file extension,
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// the resulting bitcode file disguises itself as an object file, and therefore
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// obviates the need of writing a special set of the make-rules only for LTO
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// compilation.
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//
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// The IPO phase perform inter-procedural analyses and optimizations, and
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// the Post-IPO consists two sub-phases: intra-procedural scalar optimizations
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// (SOPT), and intra-procedural target-dependent code generator (CG).
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//
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// As of this writing, we don't separate IPO and the Post-IPO SOPT. They
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// are intermingled together, and are driven by a single pass manager (see
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// PassManagerBuilder::populateLTOPassManager()).
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//
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// The "LTOCodeGenerator" is the driver for the IPO and Post-IPO stages.
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// The "CodeGenerator" here is bit confusing. Don't confuse the "CodeGenerator"
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// with the machine specific code generator.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LTO_LTOCODEGENERATOR_H
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#define LLVM_LTO_LTOCODEGENERATOR_H
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#include "llvm-c/lto.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Linker/Linker.h"
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#include "llvm/Target/TargetOptions.h"
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#include <string>
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#include <vector>
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namespace llvm {
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class LLVMContext;
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class DiagnosticInfo;
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class GlobalValue;
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class Mangler;
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class MemoryBuffer;
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class TargetLibraryInfo;
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class TargetMachine;
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class raw_ostream;
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//===----------------------------------------------------------------------===//
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/// C++ class which implements the opaque lto_code_gen_t type.
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///
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struct LTOCodeGenerator {
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static const char *getVersionString();
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LTOCodeGenerator();
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LTOCodeGenerator(std::unique_ptr<LLVMContext> Context);
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~LTOCodeGenerator();
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// Merge given module, return true on success.
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bool addModule(struct LTOModule *);
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void setTargetOptions(TargetOptions options);
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void setDebugInfo(lto_debug_model);
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void setCodePICModel(lto_codegen_model);
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void setCpu(const char *mCpu) { MCpu = mCpu; }
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void setAttr(const char *mAttr) { MAttr = mAttr; }
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void addMustPreserveSymbol(const char *sym) { MustPreserveSymbols[sym] = 1; }
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// To pass options to the driver and optimization passes. These options are
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// not necessarily for debugging purpose (The function name is misleading).
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// This function should be called before LTOCodeGenerator::compilexxx(),
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// and LTOCodeGenerator::writeMergedModules().
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void setCodeGenDebugOptions(const char *opts);
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// Parse the options set in setCodeGenDebugOptions. Like
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// setCodeGenDebugOptions, this must be called before
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// LTOCodeGenerator::compilexxx() and LTOCodeGenerator::writeMergedModules()
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void parseCodeGenDebugOptions();
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// Write the merged module to the file specified by the given path.
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// Return true on success.
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bool writeMergedModules(const char *path, std::string &errMsg);
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// Compile the merged module into a *single* object file; the path to object
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// file is returned to the caller via argument "name". Return true on
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// success.
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//
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// NOTE that it is up to the linker to remove the intermediate object file.
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// Do not try to remove the object file in LTOCodeGenerator's destructor
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// as we don't who (LTOCodeGenerator or the obj file) will last longer.
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bool compile_to_file(const char **name,
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bool disableOpt,
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bool disableInline,
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bool disableGVNLoadPRE,
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bool disableVectorization,
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std::string &errMsg);
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// As with compile_to_file(), this function compiles the merged module into
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// single object file. Instead of returning the object-file-path to the caller
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// (linker), it brings the object to a buffer, and return the buffer to the
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// caller. This function should delete intermediate object file once its content
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// is brought to memory. Return NULL if the compilation was not successful.
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const void *compile(size_t *length,
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bool disableOpt,
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bool disableInline,
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bool disableGVNLoadPRE,
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bool disableVectorization,
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std::string &errMsg);
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void setDiagnosticHandler(lto_diagnostic_handler_t, void *);
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LLVMContext &getContext() { return Context; }
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private:
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void initializeLTOPasses();
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bool generateObjectFile(raw_ostream &out, bool disableOpt, bool disableInline,
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bool disableGVNLoadPRE, bool disableVectorization,
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std::string &errMsg);
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void applyScopeRestrictions();
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void applyRestriction(GlobalValue &GV, ArrayRef<StringRef> Libcalls,
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std::vector<const char *> &MustPreserveList,
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SmallPtrSetImpl<GlobalValue *> &AsmUsed,
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Mangler &Mangler);
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bool determineTarget(std::string &errMsg);
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static void DiagnosticHandler(const DiagnosticInfo &DI, void *Context);
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void DiagnosticHandler2(const DiagnosticInfo &DI);
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typedef StringMap<uint8_t> StringSet;
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void initialize();
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std::unique_ptr<LLVMContext> OwnedContext;
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LLVMContext &Context;
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Linker IRLinker;
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TargetMachine *TargetMach;
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bool EmitDwarfDebugInfo;
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bool ScopeRestrictionsDone;
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lto_codegen_model CodeModel;
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StringSet MustPreserveSymbols;
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StringSet AsmUndefinedRefs;
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std::unique_ptr<MemoryBuffer> NativeObjectFile;
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std::vector<char *> CodegenOptions;
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std::string MCpu;
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std::string MAttr;
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std::string NativeObjectPath;
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TargetOptions Options;
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lto_diagnostic_handler_t DiagHandler;
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void *DiagContext;
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};
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}
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#endif
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