RPCSX/llvm
1
0
Fork 0
mirror of https://github.com/RPCSX/llvm.git synced 2024-11-24 12:19:53 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
d0996e5b33
llvm/tools/gold/gold-plugin.cpp
Tom Roeder 9ad9c96755 Fix the new LTOCodeGenerator setup in gold to parse options before using MAttrs. 
This fixes a regression that made clang -flto -Wl,--plugin-opt=-mattr=+aes not
pass the "+aes" option to the LTOCodeGenerator attributes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211804 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-26 20:43:27 +00:00

507 lines
15 KiB
C++
Raw Blame History

//===-- gold-plugin.cpp - Plugin to gold for Link Time Optimization ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is a gold plugin for LLVM. It provides an LLVM implementation of the
// interface described in http://gcc.gnu.org/wiki/whopr/driver .
//
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H
#include "llvm-c/lto.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/CodeGen/CommandFlags.h"
#include "llvm/LTO/LTOCodeGenerator.h"
#include "llvm/LTO/LTOModule.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <list>
#include <plugin-api.h>
#include <system_error>
#include <vector>
// Support Windows/MinGW crazyness.
#ifdef _WIN32
# include <io.h>
# define lseek _lseek
# define read _read
#endif
#ifndef LDPO_PIE
// FIXME: remove this declaration when we stop maintaining Ubuntu Quantal and
// Precise and Debian Wheezy (binutils 2.23 is required)
# define LDPO_PIE 3
#endif
using namespace llvm;
namespace {
struct claimed_file {
void *handle;
std::vector<ld_plugin_symbol> syms;
};
}
static ld_plugin_status discard_message(int level, const char *format, ...) {
// Die loudly. Recent versions of Gold pass ld_plugin_message as the first
// callback in the transfer vector. This should never be called.
abort();
}
static ld_plugin_add_symbols add_symbols = NULL;
static ld_plugin_get_symbols get_symbols = NULL;
static ld_plugin_add_input_file add_input_file = NULL;
static ld_plugin_set_extra_library_path set_extra_library_path = NULL;
static ld_plugin_get_view get_view = NULL;
static ld_plugin_message message = discard_message;
static lto_codegen_model output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
static std::string output_name = "";
static std::list<claimed_file> Modules;
static std::vector<std::string> Cleanup;
static LTOCodeGenerator *CodeGen = nullptr;
static StringSet<> CannotBeHidden;
static llvm::TargetOptions TargetOpts;
namespace options {
enum generate_bc { BC_NO, BC_ALSO, BC_ONLY };
static bool generate_api_file = false;
static generate_bc generate_bc_file = BC_NO;
static std::string bc_path;
static std::string obj_path;
static std::string extra_library_path;
static std::string triple;
static std::string mcpu;
// Additional options to pass into the code generator.
// Note: This array will contain all plugin options which are not claimed
// as plugin exclusive to pass to the code generator.
// For example, "generate-api-file" and "as"options are for the plugin
// use only and will not be passed.
static std::vector<std::string> extra;
static void process_plugin_option(const char* opt_)
{
if (opt_ == NULL)
return;
llvm::StringRef opt = opt_;
if (opt == "generate-api-file") {
generate_api_file = true;
} else if (opt.startswith("mcpu=")) {
mcpu = opt.substr(strlen("mcpu="));
} else if (opt.startswith("extra-library-path=")) {
extra_library_path = opt.substr(strlen("extra_library_path="));
} else if (opt.startswith("mtriple=")) {
triple = opt.substr(strlen("mtriple="));
} else if (opt.startswith("obj-path=")) {
obj_path = opt.substr(strlen("obj-path="));
} else if (opt == "emit-llvm") {
generate_bc_file = BC_ONLY;
} else if (opt == "also-emit-llvm") {
generate_bc_file = BC_ALSO;
} else if (opt.startswith("also-emit-llvm=")) {
llvm::StringRef path = opt.substr(strlen("also-emit-llvm="));
generate_bc_file = BC_ALSO;
if (!bc_path.empty()) {
(*message)(LDPL_WARNING, "Path to the output IL file specified twice. "
"Discarding %s", opt_);
} else {
bc_path = path;
}
} else {
// Save this option to pass to the code generator.
extra.push_back(opt);
}
}
}
static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
int *claimed);
static ld_plugin_status all_symbols_read_hook(void);
static ld_plugin_status cleanup_hook(void);
extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
ld_plugin_status onload(ld_plugin_tv *tv) {
// We're given a pointer to the first transfer vector. We read through them
// until we find one where tv_tag == LDPT_NULL. The REGISTER_* tagged values
// contain pointers to functions that we need to call to register our own
// hooks. The others are addresses of functions we can use to call into gold
// for services.
bool registeredClaimFile = false;
bool RegisteredAllSymbolsRead = false;
for (; tv->tv_tag != LDPT_NULL; ++tv) {
switch (tv->tv_tag) {
case LDPT_OUTPUT_NAME:
output_name = tv->tv_u.tv_string;
break;
case LDPT_LINKER_OUTPUT:
switch (tv->tv_u.tv_val) {
case LDPO_REL: // .o
case LDPO_DYN: // .so
case LDPO_PIE: // position independent executable
output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC;
break;
case LDPO_EXEC: // .exe
output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
break;
default:
(*message)(LDPL_ERROR, "Unknown output file type %d",
tv->tv_u.tv_val);
return LDPS_ERR;
}
break;
case LDPT_OPTION:
options::process_plugin_option(tv->tv_u.tv_string);
break;
case LDPT_REGISTER_CLAIM_FILE_HOOK: {
ld_plugin_register_claim_file callback;
callback = tv->tv_u.tv_register_claim_file;
if ((*callback)(claim_file_hook) != LDPS_OK)
return LDPS_ERR;
registeredClaimFile = true;
} break;
case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: {
ld_plugin_register_all_symbols_read callback;
callback = tv->tv_u.tv_register_all_symbols_read;
if ((*callback)(all_symbols_read_hook) != LDPS_OK)
return LDPS_ERR;
RegisteredAllSymbolsRead = true;
} break;
case LDPT_REGISTER_CLEANUP_HOOK: {
ld_plugin_register_cleanup callback;
callback = tv->tv_u.tv_register_cleanup;
if ((*callback)(cleanup_hook) != LDPS_OK)
return LDPS_ERR;
} break;
case LDPT_ADD_SYMBOLS:
add_symbols = tv->tv_u.tv_add_symbols;
break;
case LDPT_GET_SYMBOLS_V2:
get_symbols = tv->tv_u.tv_get_symbols;
break;
case LDPT_ADD_INPUT_FILE:
add_input_file = tv->tv_u.tv_add_input_file;
break;
case LDPT_SET_EXTRA_LIBRARY_PATH:
set_extra_library_path = tv->tv_u.tv_set_extra_library_path;
break;
case LDPT_GET_VIEW:
get_view = tv->tv_u.tv_get_view;
break;
case LDPT_MESSAGE:
message = tv->tv_u.tv_message;
break;
default:
break;
}
}
if (!registeredClaimFile) {
(*message)(LDPL_ERROR, "register_claim_file not passed to LLVMgold.");
return LDPS_ERR;
}
if (!add_symbols) {
(*message)(LDPL_ERROR, "add_symbols not passed to LLVMgold.");
return LDPS_ERR;
}
if (!RegisteredAllSymbolsRead)
return LDPS_OK;
InitializeAllTargetInfos();
InitializeAllTargets();
InitializeAllTargetMCs();
InitializeAllAsmParsers();
InitializeAllAsmPrinters();
CodeGen = new LTOCodeGenerator();
// Pass through extra options to the code generator.
if (!options::extra.empty()) {
for (std::vector<std::string>::iterator it = options::extra.begin();
it != options::extra.end(); ++it) {
CodeGen->setCodeGenDebugOptions((*it).c_str());
}
}
CodeGen->parseCodeGenDebugOptions();
if (MAttrs.size()) {
std::string Attrs;
for (unsigned I = 0; I < MAttrs.size(); ++I) {
if (I > 0)
Attrs.append(",");
Attrs.append(MAttrs[I]);
}
CodeGen->setAttr(Attrs.c_str());
}
TargetOpts = InitTargetOptionsFromCodeGenFlags();
CodeGen->setTargetOptions(TargetOpts);
return LDPS_OK;
}
/// claim_file_hook - called by gold to see whether this file is one that
/// our plugin can handle. We'll try to open it and register all the symbols
/// with add_symbol if possible.
static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
int *claimed) {
LTOModule *M;
const void *view;
std::unique_ptr<MemoryBuffer> buffer;
if (get_view) {
if (get_view(file->handle, &view) != LDPS_OK) {
(*message)(LDPL_ERROR, "Failed to get a view of %s", file->name);
return LDPS_ERR;
}
} else {
int64_t offset = 0;
// Gold has found what might be IR part-way inside of a file, such as
// an .a archive.
if (file->offset) {
offset = file->offset;
}
if (std::error_code ec = MemoryBuffer::getOpenFileSlice(
file->fd, file->name, buffer, file->filesize, offset)) {
(*message)(LDPL_ERROR, ec.message().c_str());
return LDPS_ERR;
}
view = buffer->getBufferStart();
}
if (!LTOModule::isBitcodeFile(view, file->filesize))
return LDPS_OK;
std::string Error;
M = LTOModule::makeLTOModule(view, file->filesize, TargetOpts, Error);
if (!M) {
(*message)(LDPL_ERROR,
"LLVM gold plugin has failed to create LTO module: %s",
Error.c_str());
return LDPS_OK;
}
*claimed = 1;
Modules.resize(Modules.size() + 1);
claimed_file &cf = Modules.back();
if (!options::triple.empty())
M->setTargetTriple(options::triple.c_str());
cf.handle = file->handle;
unsigned sym_count = M->getSymbolCount();
cf.syms.reserve(sym_count);
for (unsigned i = 0; i != sym_count; ++i) {
lto_symbol_attributes attrs = M->getSymbolAttributes(i);
if ((attrs & LTO_SYMBOL_SCOPE_MASK) == LTO_SYMBOL_SCOPE_INTERNAL)
continue;
cf.syms.push_back(ld_plugin_symbol());
ld_plugin_symbol &sym = cf.syms.back();
sym.name = strdup(M->getSymbolName(i));
sym.version = NULL;
int scope = attrs & LTO_SYMBOL_SCOPE_MASK;
bool CanBeHidden = scope == LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
if (!CanBeHidden)
CannotBeHidden.insert(sym.name);
switch (scope) {
case LTO_SYMBOL_SCOPE_HIDDEN:
sym.visibility = LDPV_HIDDEN;
break;
case LTO_SYMBOL_SCOPE_PROTECTED:
sym.visibility = LDPV_PROTECTED;
break;
case 0: // extern
case LTO_SYMBOL_SCOPE_DEFAULT:
case LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN:
sym.visibility = LDPV_DEFAULT;
break;
default:
(*message)(LDPL_ERROR, "Unknown scope attribute: %d", scope);
return LDPS_ERR;
}
int definition = attrs & LTO_SYMBOL_DEFINITION_MASK;
sym.comdat_key = NULL;
switch (definition) {
case LTO_SYMBOL_DEFINITION_REGULAR:
sym.def = LDPK_DEF;
break;
case LTO_SYMBOL_DEFINITION_UNDEFINED:
sym.def = LDPK_UNDEF;
break;
case LTO_SYMBOL_DEFINITION_TENTATIVE:
sym.def = LDPK_COMMON;
break;
case LTO_SYMBOL_DEFINITION_WEAK:
sym.comdat_key = sym.name;
sym.def = LDPK_WEAKDEF;
break;
case LTO_SYMBOL_DEFINITION_WEAKUNDEF:
sym.def = LDPK_WEAKUNDEF;
break;
default:
(*message)(LDPL_ERROR, "Unknown definition attribute: %d", definition);
return LDPS_ERR;
}
sym.size = 0;
sym.resolution = LDPR_UNKNOWN;
}
cf.syms.reserve(cf.syms.size());
if (!cf.syms.empty()) {
if ((*add_symbols)(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
(*message)(LDPL_ERROR, "Unable to add symbols!");
return LDPS_ERR;
}
}
if (CodeGen) {
std::string Error;
if (!CodeGen->addModule(M, Error)) {
(*message)(LDPL_ERROR, "Error linking module: %s", Error.c_str());
return LDPS_ERR;
}
}
delete M;
return LDPS_OK;
}
static bool mustPreserve(const claimed_file &F, int i) {
if (F.syms[i].resolution == LDPR_PREVAILING_DEF)
return true;
if (F.syms[i].resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
return CannotBeHidden.count(F.syms[i].name);
return false;
}
/// all_symbols_read_hook - gold informs us that all symbols have been read.
/// At this point, we use get_symbols to see if any of our definitions have
/// been overridden by a native object file. Then, perform optimization and
/// codegen.
static ld_plugin_status all_symbols_read_hook(void) {
std::ofstream api_file;
assert(CodeGen);
if (options::generate_api_file) {
api_file.open("apifile.txt", std::ofstream::out | std::ofstream::trunc);
if (!api_file.is_open()) {
(*message)(LDPL_FATAL, "Unable to open apifile.txt for writing.");
abort();
}
}
for (std::list<claimed_file>::iterator I = Modules.begin(),
E = Modules.end(); I != E; ++I) {
if (I->syms.empty())
continue;
(*get_symbols)(I->handle, I->syms.size(), &I->syms[0]);
for (unsigned i = 0, e = I->syms.size(); i != e; i++) {
if (mustPreserve(*I, i)) {
CodeGen->addMustPreserveSymbol(I->syms[i].name);
if (options::generate_api_file)
api_file << I->syms[i].name << "\n";
}
}
}
if (options::generate_api_file)
api_file.close();
CodeGen->setCodePICModel(output_type);
CodeGen->setDebugInfo(LTO_DEBUG_MODEL_DWARF);
if (!options::mcpu.empty())
CodeGen->setCpu(options::mcpu.c_str());
if (options::generate_bc_file != options::BC_NO) {
std::string path;
if (options::generate_bc_file == options::BC_ONLY)
path = output_name;
else if (!options::bc_path.empty())
path = options::bc_path;
else
path = output_name + ".bc";
std::string Error;
if (!CodeGen->writeMergedModules(path.c_str(), Error))
(*message)(LDPL_FATAL, "Failed to write the output file.");
if (options::generate_bc_file == options::BC_ONLY) {
delete CodeGen;
exit(0);
}
}
std::string ObjPath;
{
const char *Temp;
std::string Error;
if (!CodeGen->compile_to_file(&Temp, /*DisableOpt*/ false, /*DisableInline*/
false, /*DisableGVNLoadPRE*/ false, Error))
(*message)(LDPL_ERROR, "Could not produce a combined object file\n");
ObjPath = Temp;
}
delete CodeGen;
for (std::list<claimed_file>::iterator I = Modules.begin(),
E = Modules.end(); I != E; ++I) {
for (unsigned i = 0; i != I->syms.size(); ++i) {
ld_plugin_symbol &sym = I->syms[i];
free(sym.name);
}
}
if ((*add_input_file)(ObjPath.c_str()) != LDPS_OK) {
(*message)(LDPL_ERROR, "Unable to add .o file to the link.");
(*message)(LDPL_ERROR, "File left behind in: %s", ObjPath.c_str());
return LDPS_ERR;
}
if (!options::extra_library_path.empty() &&
set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK) {
(*message)(LDPL_ERROR, "Unable to set the extra library path.");
return LDPS_ERR;
}
if (options::obj_path.empty())
Cleanup.push_back(ObjPath);
return LDPS_OK;
}
static ld_plugin_status cleanup_hook(void) {
for (int i = 0, e = Cleanup.size(); i != e; ++i) {
std::error_code EC = sys::fs::remove(Cleanup[i]);
if (EC)
(*message)(LDPL_ERROR, "Failed to delete '%s': %s", Cleanup[i].c_str(),
EC.message().c_str());
}
return LDPS_OK;
}
Reference in New Issue View Git Blame Copy Permalink