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There are two ways one could implement hiding of linkonce_odr symbols in LTO: * LLVM tells the linker which symbols can be hidden if not used from native files. * The linker tells LLVM which symbols are not used from other object files, but will be put in the dso symbol table if present. GOLD's API is the second option. It was implemented almost 1:1 in llvm by passing the list down to internalize. LLVM already had partial support for the first option. It is also very similar to how ld64 handles hiding these symbols when *not* doing LTO. This patch then * removes the APIs for the DSO list. * marks LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN all linkonce_odr unnamed_addr global values and other linkonce_odr whose address is not used. * makes the gold plugin responsible for handling the API mismatch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193800 91177308-0d34-0410-b5e6-96231b3b80d8
306 lines
11 KiB
C++
306 lines
11 KiB
C++
//===-lto.cpp - 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 implements the Link Time Optimization library. This library is
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// intended to be used by linker to optimize code at link time.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-c/lto.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/LTO/LTOCodeGenerator.h"
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#include "llvm/LTO/LTOModule.h"
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#include "llvm-c/Core.h"
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#include "llvm-c/Target.h"
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// extra command-line flags needed for LTOCodeGenerator
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static cl::opt<bool>
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DisableOpt("disable-opt", cl::init(false),
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cl::desc("Do not run any optimization passes"));
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static cl::opt<bool>
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DisableInline("disable-inlining", cl::init(false),
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cl::desc("Do not run the inliner pass"));
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static cl::opt<bool>
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DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
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cl::desc("Do not run the GVN load PRE pass"));
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// Holds most recent error string.
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// *** Not thread safe ***
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static std::string sLastErrorString;
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// Holds the initialization state of the LTO module.
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// *** Not thread safe ***
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static bool initialized = false;
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// Holds the command-line option parsing state of the LTO module.
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static bool parsedOptions = false;
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// Initialize the configured targets if they have not been initialized.
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static void lto_initialize() {
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if (!initialized) {
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LLVMInitializeAllTargetInfos();
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LLVMInitializeAllTargets();
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LLVMInitializeAllTargetMCs();
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LLVMInitializeAllAsmParsers();
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LLVMInitializeAllAsmPrinters();
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LLVMInitializeAllDisassemblers();
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initialized = true;
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}
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}
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static void lto_set_target_options(llvm::TargetOptions &Options) {
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Options.LessPreciseFPMADOption = EnableFPMAD;
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Options.NoFramePointerElim = DisableFPElim;
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Options.AllowFPOpFusion = FuseFPOps;
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Options.UnsafeFPMath = EnableUnsafeFPMath;
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Options.NoInfsFPMath = EnableNoInfsFPMath;
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Options.NoNaNsFPMath = EnableNoNaNsFPMath;
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Options.HonorSignDependentRoundingFPMathOption =
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EnableHonorSignDependentRoundingFPMath;
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Options.UseSoftFloat = GenerateSoftFloatCalls;
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if (FloatABIForCalls != llvm::FloatABI::Default)
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Options.FloatABIType = FloatABIForCalls;
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Options.NoZerosInBSS = DontPlaceZerosInBSS;
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Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
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Options.DisableTailCalls = DisableTailCalls;
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Options.StackAlignmentOverride = OverrideStackAlignment;
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Options.TrapFuncName = TrapFuncName;
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Options.PositionIndependentExecutable = EnablePIE;
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Options.EnableSegmentedStacks = SegmentedStacks;
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Options.UseInitArray = UseInitArray;
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}
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/// lto_get_version - Returns a printable string.
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extern const char* lto_get_version() {
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return LTOCodeGenerator::getVersionString();
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}
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/// lto_get_error_message - Returns the last error string or NULL if last
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/// operation was successful.
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const char* lto_get_error_message() {
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return sLastErrorString.c_str();
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}
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/// lto_module_is_object_file - Validates if a file is a loadable object file.
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bool lto_module_is_object_file(const char* path) {
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return LTOModule::isBitcodeFile(path);
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}
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/// lto_module_is_object_file_for_target - Validates if a file is a loadable
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/// object file compilable for requested target.
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bool lto_module_is_object_file_for_target(const char* path,
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const char* target_triplet_prefix) {
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return LTOModule::isBitcodeFileForTarget(path, target_triplet_prefix);
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}
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/// lto_module_is_object_file_in_memory - Validates if a buffer is a loadable
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/// object file.
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bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
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return LTOModule::isBitcodeFile(mem, length);
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}
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/// lto_module_is_object_file_in_memory_for_target - Validates if a buffer is a
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/// loadable object file compilable for the target.
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bool
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lto_module_is_object_file_in_memory_for_target(const void* mem,
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size_t length,
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const char* target_triplet_prefix) {
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return LTOModule::isBitcodeFileForTarget(mem, length, target_triplet_prefix);
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}
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/// lto_module_create - Loads an object file from disk. Returns NULL on error
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/// (check lto_get_error_message() for details).
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lto_module_t lto_module_create(const char* path) {
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lto_initialize();
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llvm::TargetOptions Options;
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lto_set_target_options(Options);
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return LTOModule::makeLTOModule(path, Options, sLastErrorString);
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}
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/// lto_module_create_from_fd - Loads an object file from disk. Returns NULL on
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/// error (check lto_get_error_message() for details).
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lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
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lto_initialize();
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llvm::TargetOptions Options;
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lto_set_target_options(Options);
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return LTOModule::makeLTOModule(fd, path, size, Options, sLastErrorString);
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}
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/// lto_module_create_from_fd_at_offset - Loads an object file from disk.
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/// Returns NULL on error (check lto_get_error_message() for details).
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lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
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size_t file_size,
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size_t map_size,
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off_t offset) {
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lto_initialize();
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llvm::TargetOptions Options;
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lto_set_target_options(Options);
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return LTOModule::makeLTOModule(fd, path, map_size, offset, Options,
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sLastErrorString);
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}
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/// lto_module_create_from_memory - Loads an object file from memory. Returns
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/// NULL on error (check lto_get_error_message() for details).
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lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
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lto_initialize();
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llvm::TargetOptions Options;
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lto_set_target_options(Options);
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return LTOModule::makeLTOModule(mem, length, Options, sLastErrorString);
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}
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/// lto_module_dispose - Frees all memory for a module. Upon return the
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/// lto_module_t is no longer valid.
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void lto_module_dispose(lto_module_t mod) {
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delete mod;
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}
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/// lto_module_get_target_triple - Returns triplet string which the object
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/// module was compiled under.
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const char* lto_module_get_target_triple(lto_module_t mod) {
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return mod->getTargetTriple();
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}
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/// lto_module_set_target_triple - Sets triple string with which the object will
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/// be codegened.
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void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
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return mod->setTargetTriple(triple);
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}
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/// lto_module_get_num_symbols - Returns the number of symbols in the object
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/// module.
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unsigned int lto_module_get_num_symbols(lto_module_t mod) {
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return mod->getSymbolCount();
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}
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/// lto_module_get_symbol_name - Returns the name of the ith symbol in the
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/// object module.
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const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
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return mod->getSymbolName(index);
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}
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/// lto_module_get_symbol_attribute - Returns the attributes of the ith symbol
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/// in the object module.
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lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
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unsigned int index) {
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return mod->getSymbolAttributes(index);
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}
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/// lto_codegen_create - Instantiates a code generator. Returns NULL if there
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/// is an error.
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lto_code_gen_t lto_codegen_create(void) {
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lto_initialize();
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TargetOptions Options;
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lto_set_target_options(Options);
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LTOCodeGenerator *CodeGen = new LTOCodeGenerator();
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if (CodeGen)
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CodeGen->setTargetOptions(Options);
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return CodeGen;
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}
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/// lto_codegen_dispose - Frees all memory for a code generator. Upon return the
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/// lto_code_gen_t is no longer valid.
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void lto_codegen_dispose(lto_code_gen_t cg) {
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delete cg;
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}
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/// lto_codegen_add_module - Add an object module to the set of modules for
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/// which code will be generated. Returns true on error (check
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/// lto_get_error_message() for details).
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bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
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return !cg->addModule(mod, sLastErrorString);
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}
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/// lto_codegen_set_debug_model - Sets what if any format of debug info should
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/// be generated. Returns true on error (check lto_get_error_message() for
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/// details).
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bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
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cg->setDebugInfo(debug);
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return false;
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}
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/// lto_codegen_set_pic_model - Sets what code model to generated. Returns true
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/// on error (check lto_get_error_message() for details).
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bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
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cg->setCodePICModel(model);
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return false;
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}
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/// lto_codegen_set_cpu - Sets the cpu to generate code for.
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void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
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return cg->setCpu(cpu);
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}
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/// lto_codegen_set_assembler_path - Sets the path to the assembler tool.
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void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
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// In here only for backwards compatibility. We use MC now.
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}
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/// lto_codegen_set_assembler_args - Sets extra arguments that libLTO should
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/// pass to the assembler.
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void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
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int nargs) {
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// In here only for backwards compatibility. We use MC now.
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}
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/// lto_codegen_add_must_preserve_symbol - Adds to a list of all global symbols
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/// that must exist in the final generated code. If a function is not listed
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/// there, it might be inlined into every usage and optimized away.
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void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
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const char *symbol) {
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cg->addMustPreserveSymbol(symbol);
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}
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/// lto_codegen_write_merged_modules - Writes a new file at the specified path
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/// that contains the merged contents of all modules added so far. Returns true
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/// on error (check lto_get_error_message() for details).
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bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
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if (!parsedOptions) {
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cg->parseCodeGenDebugOptions();
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parsedOptions = true;
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}
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return !cg->writeMergedModules(path, sLastErrorString);
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}
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/// lto_codegen_compile - Generates code for all added modules into one native
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/// object file. On success returns a pointer to a generated mach-o/ELF buffer
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/// and length set to the buffer size. The buffer is owned by the lto_code_gen_t
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/// object and will be freed when lto_codegen_dispose() is called, or
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/// lto_codegen_compile() is called again. On failure, returns NULL (check
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/// lto_get_error_message() for details).
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const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
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if (!parsedOptions) {
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cg->parseCodeGenDebugOptions();
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parsedOptions = true;
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}
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return cg->compile(length, DisableOpt, DisableInline, DisableGVNLoadPRE,
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sLastErrorString);
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}
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/// lto_codegen_compile_to_file - Generates code for all added modules into one
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/// native object file. The name of the file is written to name. Returns true on
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/// error.
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bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
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if (!parsedOptions) {
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cg->parseCodeGenDebugOptions();
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parsedOptions = true;
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}
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return !cg->compile_to_file(name, DisableOpt, DisableInline, DisableGVNLoadPRE,
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sLastErrorString);
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}
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/// lto_codegen_debug_options - Used to pass extra options to the code
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/// generator.
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void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
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cg->setCodeGenDebugOptions(opt);
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}
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