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634 lines
21 KiB
C++
634 lines
21 KiB
C++
//===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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/ADT/STLExtras.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/CodeGen/CommandFlags.inc"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/DiagnosticPrinter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/LTO/legacy/LTOCodeGenerator.h"
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#include "llvm/LTO/legacy/LTOModule.h"
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#include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/raw_ostream.h"
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// extra command-line flags needed for LTOCodeGenerator
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static cl::opt<char>
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OptLevel("O",
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cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
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"(default = '-O2')"),
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cl::Prefix,
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cl::ZeroOrMore,
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cl::init('2'));
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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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static cl::opt<bool> DisableLTOVectorization(
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"disable-lto-vectorization", cl::init(false),
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cl::desc("Do not run loop or slp vectorization during LTO"));
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static cl::opt<bool> EnableFreestanding(
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"lto-freestanding", cl::init(false),
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cl::desc("Enable Freestanding (disable builtins / TLI) during LTO"));
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#ifdef NDEBUG
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static bool VerifyByDefault = false;
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#else
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static bool VerifyByDefault = true;
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#endif
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static cl::opt<bool> DisableVerify(
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"disable-llvm-verifier", cl::init(!VerifyByDefault),
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cl::desc("Don't run the LLVM verifier during the optimization pipeline"));
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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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static LLVMContext *LTOContext = nullptr;
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struct LTOToolDiagnosticHandler : public DiagnosticHandler {
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bool handleDiagnostics(const DiagnosticInfo &DI) override {
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if (DI.getSeverity() != DS_Error) {
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DiagnosticPrinterRawOStream DP(errs());
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DI.print(DP);
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errs() << '\n';
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return true;
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}
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sLastErrorString = "";
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{
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raw_string_ostream Stream(sLastErrorString);
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DiagnosticPrinterRawOStream DP(Stream);
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DI.print(DP);
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}
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return true;
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}
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};
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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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#ifdef _WIN32
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// Dialog box on crash disabling doesn't work across DLL boundaries, so do
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// it here.
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llvm::sys::DisableSystemDialogsOnCrash();
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#endif
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InitializeAllTargetInfos();
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmParsers();
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InitializeAllAsmPrinters();
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InitializeAllDisassemblers();
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static LLVMContext Context;
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LTOContext = &Context;
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LTOContext->setDiagnosticHandler(
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llvm::make_unique<LTOToolDiagnosticHandler>(), true);
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initialized = true;
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}
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}
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namespace {
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static void handleLibLTODiagnostic(lto_codegen_diagnostic_severity_t Severity,
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const char *Msg, void *) {
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sLastErrorString = Msg;
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}
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// This derived class owns the native object file. This helps implement the
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// libLTO API semantics, which require that the code generator owns the object
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// file.
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struct LibLTOCodeGenerator : LTOCodeGenerator {
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LibLTOCodeGenerator() : LTOCodeGenerator(*LTOContext) { init(); }
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LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
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: LTOCodeGenerator(*Context), OwnedContext(std::move(Context)) {
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init();
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}
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// Reset the module first in case MergedModule is created in OwnedContext.
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// Module must be destructed before its context gets destructed.
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~LibLTOCodeGenerator() { resetMergedModule(); }
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void init() { setDiagnosticHandler(handleLibLTODiagnostic, nullptr); }
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std::unique_ptr<MemoryBuffer> NativeObjectFile;
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std::unique_ptr<LLVMContext> OwnedContext;
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};
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}
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DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t)
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DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ThinLTOCodeGenerator, thinlto_code_gen_t)
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DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
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// Convert the subtarget features into a string to pass to LTOCodeGenerator.
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static void lto_add_attrs(lto_code_gen_t cg) {
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LTOCodeGenerator *CG = unwrap(cg);
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if (MAttrs.size()) {
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std::string attrs;
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for (unsigned i = 0; i < MAttrs.size(); ++i) {
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if (i > 0)
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attrs.append(",");
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attrs.append(MAttrs[i]);
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}
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CG->setAttr(attrs);
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}
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if (OptLevel < '0' || OptLevel > '3')
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report_fatal_error("Optimization level must be between 0 and 3");
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CG->setOptLevel(OptLevel - '0');
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CG->setFreestanding(EnableFreestanding);
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}
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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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const char* lto_get_error_message() {
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return sLastErrorString.c_str();
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}
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bool lto_module_is_object_file(const char* path) {
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return LTOModule::isBitcodeFile(StringRef(path));
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}
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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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ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
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if (!Buffer)
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return false;
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return LTOModule::isBitcodeForTarget(Buffer->get(),
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StringRef(target_triplet_prefix));
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}
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bool lto_module_has_objc_category(const void *mem, size_t length) {
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std::unique_ptr<MemoryBuffer> Buffer(LTOModule::makeBuffer(mem, length));
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if (!Buffer)
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return false;
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LLVMContext Ctx;
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ErrorOr<bool> Result = expectedToErrorOrAndEmitErrors(
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Ctx, llvm::isBitcodeContainingObjCCategory(*Buffer));
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return Result && *Result;
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}
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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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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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std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
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if (!buffer)
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return false;
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return LTOModule::isBitcodeForTarget(buffer.get(),
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StringRef(target_triplet_prefix));
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}
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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 = InitTargetOptionsFromCodeGenFlags();
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ErrorOr<std::unique_ptr<LTOModule>> M =
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LTOModule::createFromFile(*LTOContext, StringRef(path), Options);
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if (!M)
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return nullptr;
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return wrap(M->release());
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}
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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 = InitTargetOptionsFromCodeGenFlags();
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ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFile(
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*LTOContext, fd, StringRef(path), size, Options);
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if (!M)
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return nullptr;
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return wrap(M->release());
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}
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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 = InitTargetOptionsFromCodeGenFlags();
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ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFileSlice(
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*LTOContext, fd, StringRef(path), map_size, offset, Options);
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if (!M)
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return nullptr;
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return wrap(M->release());
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}
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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 = InitTargetOptionsFromCodeGenFlags();
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ErrorOr<std::unique_ptr<LTOModule>> M =
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LTOModule::createFromBuffer(*LTOContext, mem, length, Options);
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if (!M)
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return nullptr;
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return wrap(M->release());
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}
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lto_module_t lto_module_create_from_memory_with_path(const void* mem,
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size_t length,
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const char *path) {
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lto_initialize();
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llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
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ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
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*LTOContext, mem, length, Options, StringRef(path));
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if (!M)
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return nullptr;
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return wrap(M->release());
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}
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lto_module_t lto_module_create_in_local_context(const void *mem, size_t length,
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const char *path) {
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lto_initialize();
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llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
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// Create a local context. Ownership will be transferred to LTOModule.
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std::unique_ptr<LLVMContext> Context = llvm::make_unique<LLVMContext>();
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Context->setDiagnosticHandler(llvm::make_unique<LTOToolDiagnosticHandler>(),
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true);
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ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createInLocalContext(
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std::move(Context), mem, length, Options, StringRef(path));
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if (!M)
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return nullptr;
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return wrap(M->release());
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}
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lto_module_t lto_module_create_in_codegen_context(const void *mem,
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size_t length,
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const char *path,
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lto_code_gen_t cg) {
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lto_initialize();
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llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
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ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
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unwrap(cg)->getContext(), mem, length, Options, StringRef(path));
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return wrap(M->release());
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}
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void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
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const char* lto_module_get_target_triple(lto_module_t mod) {
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return unwrap(mod)->getTargetTriple().c_str();
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}
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void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
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return unwrap(mod)->setTargetTriple(StringRef(triple));
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}
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unsigned int lto_module_get_num_symbols(lto_module_t mod) {
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return unwrap(mod)->getSymbolCount();
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}
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const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
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return unwrap(mod)->getSymbolName(index).data();
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}
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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 unwrap(mod)->getSymbolAttributes(index);
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}
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const char* lto_module_get_linkeropts(lto_module_t mod) {
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return unwrap(mod)->getLinkerOpts().data();
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}
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void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
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lto_diagnostic_handler_t diag_handler,
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void *ctxt) {
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unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
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}
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static lto_code_gen_t createCodeGen(bool InLocalContext) {
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lto_initialize();
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TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
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LibLTOCodeGenerator *CodeGen =
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InLocalContext ? new LibLTOCodeGenerator(make_unique<LLVMContext>())
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: new LibLTOCodeGenerator();
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CodeGen->setTargetOptions(Options);
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return wrap(CodeGen);
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}
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lto_code_gen_t lto_codegen_create(void) {
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return createCodeGen(/* InLocalContext */ false);
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}
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lto_code_gen_t lto_codegen_create_in_local_context(void) {
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return createCodeGen(/* InLocalContext */ true);
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}
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void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
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bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
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return !unwrap(cg)->addModule(unwrap(mod));
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}
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void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) {
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unwrap(cg)->setModule(std::unique_ptr<LTOModule>(unwrap(mod)));
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}
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bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
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unwrap(cg)->setDebugInfo(debug);
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return false;
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}
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bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
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switch (model) {
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case LTO_CODEGEN_PIC_MODEL_STATIC:
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unwrap(cg)->setCodePICModel(Reloc::Static);
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return false;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
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unwrap(cg)->setCodePICModel(Reloc::PIC_);
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return false;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
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unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
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return false;
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case LTO_CODEGEN_PIC_MODEL_DEFAULT:
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unwrap(cg)->setCodePICModel(None);
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return false;
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}
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sLastErrorString = "Unknown PIC model";
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return true;
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}
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void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
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return unwrap(cg)->setCpu(cpu);
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}
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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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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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void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
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const char *symbol) {
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unwrap(cg)->addMustPreserveSymbol(symbol);
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}
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static void maybeParseOptions(lto_code_gen_t cg) {
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if (!parsedOptions) {
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unwrap(cg)->parseCodeGenDebugOptions();
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lto_add_attrs(cg);
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parsedOptions = true;
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}
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}
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bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
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maybeParseOptions(cg);
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return !unwrap(cg)->writeMergedModules(path);
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}
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const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
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maybeParseOptions(cg);
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LibLTOCodeGenerator *CG = unwrap(cg);
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CG->NativeObjectFile =
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CG->compile(DisableVerify, DisableInline, DisableGVNLoadPRE,
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DisableLTOVectorization);
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if (!CG->NativeObjectFile)
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return nullptr;
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*length = CG->NativeObjectFile->getBufferSize();
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return CG->NativeObjectFile->getBufferStart();
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}
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bool lto_codegen_optimize(lto_code_gen_t cg) {
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maybeParseOptions(cg);
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return !unwrap(cg)->optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
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DisableLTOVectorization);
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}
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const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
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maybeParseOptions(cg);
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LibLTOCodeGenerator *CG = unwrap(cg);
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CG->NativeObjectFile = CG->compileOptimized();
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if (!CG->NativeObjectFile)
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return nullptr;
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*length = CG->NativeObjectFile->getBufferSize();
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return CG->NativeObjectFile->getBufferStart();
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}
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bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
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maybeParseOptions(cg);
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return !unwrap(cg)->compile_to_file(
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name, DisableVerify, DisableInline, DisableGVNLoadPRE,
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DisableLTOVectorization);
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}
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void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
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unwrap(cg)->setCodeGenDebugOptions(opt);
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}
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unsigned int lto_api_version() { return LTO_API_VERSION; }
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void lto_codegen_set_should_internalize(lto_code_gen_t cg,
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bool ShouldInternalize) {
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unwrap(cg)->setShouldInternalize(ShouldInternalize);
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}
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void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
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lto_bool_t ShouldEmbedUselists) {
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unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists);
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}
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// ThinLTO API below
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thinlto_code_gen_t thinlto_create_codegen(void) {
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lto_initialize();
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ThinLTOCodeGenerator *CodeGen = new ThinLTOCodeGenerator();
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CodeGen->setTargetOptions(InitTargetOptionsFromCodeGenFlags());
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CodeGen->setFreestanding(EnableFreestanding);
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if (OptLevel.getNumOccurrences()) {
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if (OptLevel < '0' || OptLevel > '3')
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report_fatal_error("Optimization level must be between 0 and 3");
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CodeGen->setOptLevel(OptLevel - '0');
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switch (OptLevel) {
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case '0':
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CodeGen->setCodeGenOptLevel(CodeGenOpt::None);
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break;
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case '1':
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CodeGen->setCodeGenOptLevel(CodeGenOpt::Less);
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break;
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case '2':
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CodeGen->setCodeGenOptLevel(CodeGenOpt::Default);
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break;
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case '3':
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CodeGen->setCodeGenOptLevel(CodeGenOpt::Aggressive);
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break;
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}
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}
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return wrap(CodeGen);
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}
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void thinlto_codegen_dispose(thinlto_code_gen_t cg) { delete unwrap(cg); }
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void thinlto_codegen_add_module(thinlto_code_gen_t cg, const char *Identifier,
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const char *Data, int Length) {
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unwrap(cg)->addModule(Identifier, StringRef(Data, Length));
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}
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void thinlto_codegen_process(thinlto_code_gen_t cg) { unwrap(cg)->run(); }
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unsigned int thinlto_module_get_num_objects(thinlto_code_gen_t cg) {
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return unwrap(cg)->getProducedBinaries().size();
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}
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LTOObjectBuffer thinlto_module_get_object(thinlto_code_gen_t cg,
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unsigned int index) {
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assert(index < unwrap(cg)->getProducedBinaries().size() && "Index overflow");
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auto &MemBuffer = unwrap(cg)->getProducedBinaries()[index];
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return LTOObjectBuffer{MemBuffer->getBufferStart(),
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MemBuffer->getBufferSize()};
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}
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unsigned int thinlto_module_get_num_object_files(thinlto_code_gen_t cg) {
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return unwrap(cg)->getProducedBinaryFiles().size();
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}
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const char *thinlto_module_get_object_file(thinlto_code_gen_t cg,
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unsigned int index) {
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assert(index < unwrap(cg)->getProducedBinaryFiles().size() &&
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"Index overflow");
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return unwrap(cg)->getProducedBinaryFiles()[index].c_str();
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}
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void thinlto_codegen_disable_codegen(thinlto_code_gen_t cg,
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lto_bool_t disable) {
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unwrap(cg)->disableCodeGen(disable);
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}
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void thinlto_codegen_set_codegen_only(thinlto_code_gen_t cg,
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lto_bool_t CodeGenOnly) {
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unwrap(cg)->setCodeGenOnly(CodeGenOnly);
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}
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void thinlto_debug_options(const char *const *options, int number) {
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// if options were requested, set them
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if (number && options) {
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std::vector<const char *> CodegenArgv(1, "libLTO");
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for (auto Arg : ArrayRef<const char *>(options, number))
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CodegenArgv.push_back(Arg);
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cl::ParseCommandLineOptions(CodegenArgv.size(), CodegenArgv.data());
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}
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}
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lto_bool_t lto_module_is_thinlto(lto_module_t mod) {
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return unwrap(mod)->isThinLTO();
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}
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void thinlto_codegen_add_must_preserve_symbol(thinlto_code_gen_t cg,
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const char *Name, int Length) {
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unwrap(cg)->preserveSymbol(StringRef(Name, Length));
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}
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void thinlto_codegen_add_cross_referenced_symbol(thinlto_code_gen_t cg,
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const char *Name, int Length) {
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unwrap(cg)->crossReferenceSymbol(StringRef(Name, Length));
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}
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void thinlto_codegen_set_cpu(thinlto_code_gen_t cg, const char *cpu) {
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return unwrap(cg)->setCpu(cpu);
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}
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void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
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const char *cache_dir) {
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return unwrap(cg)->setCacheDir(cache_dir);
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}
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void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
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int interval) {
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return unwrap(cg)->setCachePruningInterval(interval);
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}
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void thinlto_codegen_set_cache_entry_expiration(thinlto_code_gen_t cg,
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unsigned expiration) {
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return unwrap(cg)->setCacheEntryExpiration(expiration);
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}
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void thinlto_codegen_set_final_cache_size_relative_to_available_space(
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thinlto_code_gen_t cg, unsigned Percentage) {
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return unwrap(cg)->setMaxCacheSizeRelativeToAvailableSpace(Percentage);
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}
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void thinlto_codegen_set_cache_size_bytes(
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thinlto_code_gen_t cg, unsigned MaxSizeBytes) {
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return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
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}
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void thinlto_codegen_set_cache_size_megabytes(
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thinlto_code_gen_t cg, unsigned MaxSizeMegabytes) {
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uint64_t MaxSizeBytes = MaxSizeMegabytes;
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MaxSizeBytes *= 1024 * 1024;
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return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
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}
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void thinlto_codegen_set_cache_size_files(
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thinlto_code_gen_t cg, unsigned MaxSizeFiles) {
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return unwrap(cg)->setCacheMaxSizeFiles(MaxSizeFiles);
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}
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void thinlto_codegen_set_savetemps_dir(thinlto_code_gen_t cg,
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const char *save_temps_dir) {
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return unwrap(cg)->setSaveTempsDir(save_temps_dir);
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}
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void thinlto_set_generated_objects_dir(thinlto_code_gen_t cg,
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const char *save_temps_dir) {
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unwrap(cg)->setGeneratedObjectsDirectory(save_temps_dir);
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}
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lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
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lto_codegen_model model) {
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switch (model) {
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case LTO_CODEGEN_PIC_MODEL_STATIC:
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unwrap(cg)->setCodePICModel(Reloc::Static);
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return false;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
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unwrap(cg)->setCodePICModel(Reloc::PIC_);
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return false;
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case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
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unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
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return false;
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case LTO_CODEGEN_PIC_MODEL_DEFAULT:
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unwrap(cg)->setCodePICModel(None);
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return false;
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}
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sLastErrorString = "Unknown PIC model";
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return true;
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}
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