llvm/tools/lto/lto.cpp
Peter Collingbourne 10e9fb18d4 lto: Clean up C libLTO interfaces pertaining to linker flags.
Specifically, remove the dependent library interface and replace the existing
linker option interface with a new one that returns a single list of flags.

Differential Revision: http://reviews.llvm.org/D10820

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241018 91177308-0d34-0410-b5e6-96231b3b80d8
2015-06-29 23:09:12 +00:00

357 lines
12 KiB
C++

//===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Link Time Optimization library. This library is
// intended to be used by linker to optimize code at link time.
//
//===----------------------------------------------------------------------===//
#include "llvm-c/lto.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/CommandFlags.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/LTO/LTOCodeGenerator.h"
#include "llvm/LTO/LTOModule.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetSelect.h"
// extra command-line flags needed for LTOCodeGenerator
static cl::opt<char>
OptLevel("O",
cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
"(default = '-O2')"),
cl::Prefix,
cl::ZeroOrMore,
cl::init('2'));
static cl::opt<bool>
DisableInline("disable-inlining", cl::init(false),
cl::desc("Do not run the inliner pass"));
static cl::opt<bool>
DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
cl::desc("Do not run the GVN load PRE pass"));
static cl::opt<bool>
DisableLTOVectorization("disable-lto-vectorization", cl::init(false),
cl::desc("Do not run loop or slp vectorization during LTO"));
// Holds most recent error string.
// *** Not thread safe ***
static std::string sLastErrorString;
// Holds the initialization state of the LTO module.
// *** Not thread safe ***
static bool initialized = false;
// Holds the command-line option parsing state of the LTO module.
static bool parsedOptions = false;
// Initialize the configured targets if they have not been initialized.
static void lto_initialize() {
if (!initialized) {
#ifdef LLVM_ON_WIN32
// Dialog box on crash disabling doesn't work across DLL boundaries, so do
// it here.
llvm::sys::DisableSystemDialogsOnCrash();
#endif
InitializeAllTargetInfos();
InitializeAllTargets();
InitializeAllTargetMCs();
InitializeAllAsmParsers();
InitializeAllAsmPrinters();
InitializeAllDisassemblers();
initialized = true;
}
}
namespace {
// This derived class owns the native object file. This helps implement the
// libLTO API semantics, which require that the code generator owns the object
// file.
struct LibLTOCodeGenerator : LTOCodeGenerator {
LibLTOCodeGenerator() {}
LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
: LTOCodeGenerator(std::move(Context)) {}
std::unique_ptr<MemoryBuffer> NativeObjectFile;
};
}
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t)
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
// Convert the subtarget features into a string to pass to LTOCodeGenerator.
static void lto_add_attrs(lto_code_gen_t cg) {
LTOCodeGenerator *CG = unwrap(cg);
if (MAttrs.size()) {
std::string attrs;
for (unsigned i = 0; i < MAttrs.size(); ++i) {
if (i > 0)
attrs.append(",");
attrs.append(MAttrs[i]);
}
CG->setAttr(attrs.c_str());
}
if (OptLevel < '0' || OptLevel > '3')
report_fatal_error("Optimization level must be between 0 and 3");
CG->setOptLevel(OptLevel - '0');
}
extern const char* lto_get_version() {
return LTOCodeGenerator::getVersionString();
}
const char* lto_get_error_message() {
return sLastErrorString.c_str();
}
bool lto_module_is_object_file(const char* path) {
return LTOModule::isBitcodeFile(path);
}
bool lto_module_is_object_file_for_target(const char* path,
const char* target_triplet_prefix) {
ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
if (!Buffer)
return false;
return LTOModule::isBitcodeForTarget(Buffer->get(), target_triplet_prefix);
}
bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
return LTOModule::isBitcodeFile(mem, length);
}
bool
lto_module_is_object_file_in_memory_for_target(const void* mem,
size_t length,
const char* target_triplet_prefix) {
std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
if (!buffer)
return false;
return LTOModule::isBitcodeForTarget(buffer.get(), target_triplet_prefix);
}
lto_module_t lto_module_create(const char* path) {
lto_initialize();
llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
return wrap(LTOModule::createFromFile(path, Options, sLastErrorString));
}
lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
lto_initialize();
llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
return wrap(
LTOModule::createFromOpenFile(fd, path, size, Options, sLastErrorString));
}
lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
size_t file_size,
size_t map_size,
off_t offset) {
lto_initialize();
llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
return wrap(LTOModule::createFromOpenFileSlice(fd, path, map_size, offset,
Options, sLastErrorString));
}
lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
lto_initialize();
llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
return wrap(LTOModule::createFromBuffer(mem, length, Options, sLastErrorString));
}
lto_module_t lto_module_create_from_memory_with_path(const void* mem,
size_t length,
const char *path) {
lto_initialize();
llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
return wrap(
LTOModule::createFromBuffer(mem, length, Options, sLastErrorString, path));
}
lto_module_t lto_module_create_in_local_context(const void *mem, size_t length,
const char *path) {
lto_initialize();
llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
return wrap(LTOModule::createInLocalContext(mem, length, Options,
sLastErrorString, path));
}
lto_module_t lto_module_create_in_codegen_context(const void *mem,
size_t length,
const char *path,
lto_code_gen_t cg) {
lto_initialize();
llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
return wrap(LTOModule::createInContext(mem, length, Options, sLastErrorString,
path, &unwrap(cg)->getContext()));
}
void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
const char* lto_module_get_target_triple(lto_module_t mod) {
return unwrap(mod)->getTargetTriple().c_str();
}
void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
return unwrap(mod)->setTargetTriple(triple);
}
unsigned int lto_module_get_num_symbols(lto_module_t mod) {
return unwrap(mod)->getSymbolCount();
}
const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
return unwrap(mod)->getSymbolName(index);
}
lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
unsigned int index) {
return unwrap(mod)->getSymbolAttributes(index);
}
const char* lto_module_get_linkeropts(lto_module_t mod) {
return unwrap(mod)->getLinkerOpts();
}
void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
lto_diagnostic_handler_t diag_handler,
void *ctxt) {
unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
}
static lto_code_gen_t createCodeGen(bool InLocalContext) {
lto_initialize();
TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
LibLTOCodeGenerator *CodeGen =
InLocalContext ? new LibLTOCodeGenerator(make_unique<LLVMContext>())
: new LibLTOCodeGenerator();
CodeGen->setTargetOptions(Options);
return wrap(CodeGen);
}
lto_code_gen_t lto_codegen_create(void) {
return createCodeGen(/* InLocalContext */ false);
}
lto_code_gen_t lto_codegen_create_in_local_context(void) {
return createCodeGen(/* InLocalContext */ true);
}
void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
return !unwrap(cg)->addModule(unwrap(mod));
}
void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) {
unwrap(cg)->setModule(unwrap(mod));
}
bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
unwrap(cg)->setDebugInfo(debug);
return false;
}
bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
unwrap(cg)->setCodePICModel(model);
return false;
}
void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
return unwrap(cg)->setCpu(cpu);
}
void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
// In here only for backwards compatibility. We use MC now.
}
void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
int nargs) {
// In here only for backwards compatibility. We use MC now.
}
void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
const char *symbol) {
unwrap(cg)->addMustPreserveSymbol(symbol);
}
static void maybeParseOptions(lto_code_gen_t cg) {
if (!parsedOptions) {
unwrap(cg)->parseCodeGenDebugOptions();
lto_add_attrs(cg);
parsedOptions = true;
}
}
bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
maybeParseOptions(cg);
return !unwrap(cg)->writeMergedModules(path, sLastErrorString);
}
const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
maybeParseOptions(cg);
LibLTOCodeGenerator *CG = unwrap(cg);
CG->NativeObjectFile = CG->compile(DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization, sLastErrorString);
if (!CG->NativeObjectFile)
return nullptr;
*length = CG->NativeObjectFile->getBufferSize();
return CG->NativeObjectFile->getBufferStart();
}
bool lto_codegen_optimize(lto_code_gen_t cg) {
maybeParseOptions(cg);
return !unwrap(cg)->optimize(DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
sLastErrorString);
}
const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
maybeParseOptions(cg);
LibLTOCodeGenerator *CG = unwrap(cg);
CG->NativeObjectFile = CG->compileOptimized(sLastErrorString);
if (!CG->NativeObjectFile)
return nullptr;
*length = CG->NativeObjectFile->getBufferSize();
return CG->NativeObjectFile->getBufferStart();
}
bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
maybeParseOptions(cg);
return !unwrap(cg)->compile_to_file(
name, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization, sLastErrorString);
}
void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
unwrap(cg)->setCodeGenDebugOptions(opt);
}
unsigned int lto_api_version() { return LTO_API_VERSION; }
void lto_codegen_set_should_internalize(lto_code_gen_t cg,
bool ShouldInternalize) {
unwrap(cg)->setShouldInternalize(ShouldInternalize);
}
void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
lto_bool_t ShouldEmbedUselists) {
unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists);
}