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Start using C++ types such as StringRef and MemoryBuffer in the C++ LTO API. In doing so, clarify the ownership of the native object file: the caller now owns it, not the LTOCodeGenerator. The C libLTO library has been modified to use a derived class of LTOCodeGenerator that owns the object file. Differential Revision: http://reviews.llvm.org/D10114 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238776 91177308-0d34-0410-b5e6-96231b3b80d8
369 lines
12 KiB
C++
369 lines
12 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/ADT/STLExtras.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/IR/LLVMContext.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/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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// 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>
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DisableLTOVectorization("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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// 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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#ifdef LLVM_ON_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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initialized = true;
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}
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}
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namespace {
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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() {}
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LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
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: LTOCodeGenerator(std::move(Context)) {}
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std::unique_ptr<MemoryBuffer> NativeObjectFile;
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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(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.c_str());
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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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}
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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(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(), target_triplet_prefix);
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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(), 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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return wrap(LTOModule::createFromFile(path, Options, sLastErrorString));
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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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return wrap(
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LTOModule::createFromOpenFile(fd, path, size, Options, sLastErrorString));
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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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return wrap(LTOModule::createFromOpenFileSlice(fd, path, map_size, offset,
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Options, sLastErrorString));
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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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return wrap(LTOModule::createFromBuffer(mem, length, Options, sLastErrorString));
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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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return wrap(
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LTOModule::createFromBuffer(mem, length, Options, sLastErrorString, path));
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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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return wrap(LTOModule::createInLocalContext(mem, length, Options,
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sLastErrorString, path));
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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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return wrap(LTOModule::createInContext(mem, length, Options, sLastErrorString,
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path, &unwrap(cg)->getContext()));
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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(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);
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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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unsigned int lto_module_get_num_deplibs(lto_module_t mod) {
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return unwrap(mod)->getDependentLibraryCount();
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}
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const char* lto_module_get_deplib(lto_module_t mod, unsigned int index) {
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return unwrap(mod)->getDependentLibrary(index);
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}
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unsigned int lto_module_get_num_linkeropts(lto_module_t mod) {
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return unwrap(mod)->getLinkerOptCount();
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}
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const char* lto_module_get_linkeropt(lto_module_t mod, unsigned int index) {
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return unwrap(mod)->getLinkerOpt(index);
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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(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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unwrap(cg)->setCodePICModel(model);
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return false;
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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, sLastErrorString);
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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 = CG->compile(DisableInline, DisableGVNLoadPRE,
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DisableLTOVectorization, sLastErrorString);
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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(DisableInline,
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DisableGVNLoadPRE, DisableLTOVectorization,
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sLastErrorString);
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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(sLastErrorString);
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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, DisableInline, DisableGVNLoadPRE,
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DisableLTOVectorization, sLastErrorString);
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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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