//
//===----------------------------------------------------------------------===//
-#include "llvm/Config/config.h"
-#include "plugin-api.h"
-
+#include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H
#include "llvm-c/lto.h"
-
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/System/Errno.h"
-#include "llvm/System/Path.h"
-#include "llvm/System/Program.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>
-using namespace llvm;
+// Support Windows/MinGW crazyness.
+#ifdef _WIN32
+# include <io.h>
+# define lseek _lseek
+# define read _read
+#endif
-namespace {
- 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();
- }
+#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
- ld_plugin_add_symbols add_symbols = NULL;
- ld_plugin_get_symbols get_symbols = NULL;
- ld_plugin_add_input_file add_input_file = NULL;
- ld_plugin_message message = discard_message;
-
- int api_version = 0;
- int gold_version = 0;
+using namespace llvm;
- struct claimed_file {
- lto_module_t M;
- void *handle;
- std::vector<ld_plugin_symbol> syms;
- };
+namespace {
+struct claimed_file {
+ void *handle;
+ std::vector<ld_plugin_symbol> syms;
+};
+}
- lto_codegen_model output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
- std::list<claimed_file> Modules;
- std::vector<sys::Path> Cleanup;
+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 const char *as_path = NULL;
+ 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
+ // 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
+ // 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)
+ static void process_plugin_option(const char* opt_)
{
- if (opt == NULL)
+ if (opt_ == NULL)
return;
+ llvm::StringRef opt = opt_;
- if (strcmp("generate-api-file", opt) == 0) {
+ if (opt == "generate-api-file") {
generate_api_file = true;
- } else if (strncmp("as=", opt, 3) == 0) {
- if (as_path) {
- (*message)(LDPL_WARNING, "Path to as specified twice. "
- "Discarding %s", opt);
- } else {
- as_path = strdup(opt + 3);
- }
- } else if(llvm::StringRef(opt).startswith("also-emit-llvm=")) {
- const char *path = opt + strlen("also-emit-llvm=");
- if (bc_path != "") {
+ } 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);
+ "Discarding %s", opt_);
} else {
bc_path = path;
}
} else {
// Save this option to pass to the code generator.
- extra.push_back(std::string(opt));
+ extra.push_back(opt);
}
}
}
extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
ld_plugin_status onload(ld_plugin_tv *tv) {
+ InitializeAllTargetInfos();
+ InitializeAllTargets();
+ InitializeAllTargetMCs();
+ InitializeAllAsmParsers();
+ InitializeAllAsmPrinters();
+
// 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
// for services.
bool registeredClaimFile = false;
- bool registeredAllSymbolsRead = false;
- bool registeredCleanup = false;
+ bool RegisteredAllSymbolsRead = false;
for (; tv->tv_tag != LDPT_NULL; ++tv) {
switch (tv->tv_tag) {
- case LDPT_API_VERSION:
- api_version = tv->tv_u.tv_val;
- break;
- case LDPT_GOLD_VERSION: // major * 100 + minor
- gold_version = tv->tv_u.tv_val;
+ 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
tv->tv_u.tv_val);
return LDPS_ERR;
}
- // TODO: add an option to disable PIC.
- //output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC;
break;
case LDPT_OPTION:
options::process_plugin_option(tv->tv_u.tv_string);
if ((*callback)(all_symbols_read_hook) != LDPS_OK)
return LDPS_ERR;
- registeredAllSymbolsRead = true;
+ RegisteredAllSymbolsRead = true;
} break;
case LDPT_REGISTER_CLEANUP_HOOK: {
ld_plugin_register_cleanup callback;
if ((*callback)(cleanup_hook) != LDPS_OK)
return LDPS_ERR;
-
- registeredCleanup = true;
} break;
case LDPT_ADD_SYMBOLS:
add_symbols = tv->tv_u.tv_add_symbols;
break;
- case LDPT_GET_SYMBOLS:
+ 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;
return LDPS_ERR;
}
+ if (!RegisteredAllSymbolsRead)
+ return LDPS_OK;
+
+ 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.
+/// 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) {
- void *buf = NULL;
- if (file->offset) {
- // Gold has found what might be IR part-way inside of a file, such as
- // an .a archive.
- if (lseek(file->fd, file->offset, SEEK_SET) == -1) {
- (*message)(LDPL_ERROR,
- "Failed to seek to archive member of %s at offset %d: %s\n",
- file->name,
- file->offset, sys::StrError(errno).c_str());
+ 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;
}
- buf = malloc(file->filesize);
- if (!buf) {
- (*message)(LDPL_ERROR,
- "Failed to allocate buffer for archive member of size: %d\n",
- file->filesize);
- 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 (read(file->fd, buf, file->filesize) != file->filesize) {
- (*message)(LDPL_ERROR,
- "Failed to read archive member of %s at offset %d: %s\n",
- file->name,
- file->offset,
- sys::StrError(errno).c_str());
- free(buf);
+ 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;
}
- if (!lto_module_is_object_file_in_memory(buf, file->filesize)) {
- free(buf);
- return LDPS_OK;
- }
- } else if (!lto_module_is_object_file(file->name))
+ view = buffer->getBufferStart();
+ }
+
+ if (!LTOModule::isBitcodeFile(view, file->filesize))
return LDPS_OK;
+ std::string Error;
+ LTOModule *M =
+ LTOModule::createFromBuffer(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();
- cf.M = buf ? lto_module_create_from_memory(buf, file->filesize) :
- lto_module_create(file->name);
- free(buf);
- if (!cf.M) {
- (*message)(LDPL_ERROR, "Failed to create LLVM module: %s",
- lto_get_error_message());
- return LDPS_ERR;
- }
+ if (!options::triple.empty())
+ M->setTargetTriple(options::triple.c_str());
+
cf.handle = file->handle;
- unsigned sym_count = lto_module_get_num_symbols(cf.M);
+ unsigned sym_count = M->getSymbolCount();
cf.syms.reserve(sym_count);
for (unsigned i = 0; i != sym_count; ++i) {
- lto_symbol_attributes attrs = lto_module_get_symbol_attribute(cf.M, 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 = const_cast<char *>(lto_module_get_symbol_name(cf.M, i));
+ 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 0: // extern
case LTO_SYMBOL_SCOPE_DEFAULT:
+ case LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN:
sym.visibility = LDPV_DEFAULT;
break;
default:
}
int definition = attrs & LTO_SYMBOL_DEFINITION_MASK;
+ sym.comdat_key = NULL;
switch (definition) {
case LTO_SYMBOL_DEFINITION_REGULAR:
sym.def = LDPK_DEF;
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:
return LDPS_ERR;
}
- // LLVM never emits COMDAT.
sym.size = 0;
- sym.comdat_key = NULL;
sym.resolution = LDPR_UNKNOWN;
}
}
}
+ 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) {
- lto_code_gen_t cg = lto_codegen_create();
-
- for (std::list<claimed_file>::iterator I = Modules.begin(),
- E = Modules.end(); I != E; ++I)
- lto_codegen_add_module(cg, I->M);
-
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()) {
}
}
- // If we don't preserve any symbols, libLTO will assume that all symbols are
- // needed. Keep all symbols unless we're producing a final executable.
- bool anySymbolsPreserved = false;
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 (I->syms[i].resolution == LDPR_PREVAILING_DEF) {
- lto_codegen_add_must_preserve_symbol(cg, I->syms[i].name);
- anySymbolsPreserved = true;
+ 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();
-
- if (!anySymbolsPreserved) {
- // This entire file is unnecessary!
- lto_codegen_dispose(cg);
- return LDPS_OK;
- }
}
- lto_codegen_set_pic_model(cg, output_type);
- lto_codegen_set_debug_model(cg, LTO_DEBUG_MODEL_DWARF);
- if (options::as_path) {
- sys::Path p = sys::Program::FindProgramByName(options::as_path);
- lto_codegen_set_assembler_path(cg, p.c_str());
- }
- // 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) {
- lto_codegen_debug_options(cg, (*it).c_str());
+ 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);
}
}
- if (options::bc_path != "") {
- bool err = lto_codegen_write_merged_modules(cg, options::bc_path.c_str());
- if (err)
- (*message)(LDPL_FATAL, "Failed to write the output file.");
+ 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;
}
- size_t bufsize = 0;
- const char *buffer = static_cast<const char *>(lto_codegen_compile(cg,
- &bufsize));
- std::string ErrMsg;
-
- sys::Path uniqueObjPath("/tmp/llvmgold.o");
- if (uniqueObjPath.createTemporaryFileOnDisk(true, &ErrMsg)) {
- (*message)(LDPL_ERROR, "%s", ErrMsg.c_str());
- return LDPS_ERR;
+ 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);
+ }
}
- raw_fd_ostream *objFile =
- new raw_fd_ostream(uniqueObjPath.c_str(), ErrMsg,
- raw_fd_ostream::F_Binary);
- if (!ErrMsg.empty()) {
- delete objFile;
- (*message)(LDPL_ERROR, "%s", ErrMsg.c_str());
+
+ 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;
}
- objFile->write(buffer, bufsize);
- objFile->close();
-
- lto_codegen_dispose(cg);
-
- if ((*add_input_file)(const_cast<char*>(uniqueObjPath.c_str())) != LDPS_OK) {
- (*message)(LDPL_ERROR, "Unable to add .o file to the link.");
- (*message)(LDPL_ERROR, "File left behind in: %s", uniqueObjPath.c_str());
+ 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;
}
- Cleanup.push_back(uniqueObjPath);
+ if (options::obj_path.empty())
+ Cleanup.push_back(ObjPath);
return LDPS_OK;
}
static ld_plugin_status cleanup_hook(void) {
- std::string ErrMsg;
-
- for (int i = 0, e = Cleanup.size(); i != e; ++i)
- if (Cleanup[i].eraseFromDisk(false, &ErrMsg))
+ 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(),
- ErrMsg.c_str());
+ EC.message().c_str());
+ }
return LDPS_OK;
}
projects / oota-llvm.git / blobdiff