//
//===----------------------------------------------------------------------===//
+#include "llvm/Config/config.h"
#include "plugin-api.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 <cerrno>
#include <cstdlib>
#include <cstring>
+#include <fstream>
#include <list>
#include <vector>
-#include <cerrno>
using namespace llvm;
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_add_input_library add_input_library = NULL;
+ ld_plugin_set_extra_library_path set_extra_library_path = NULL;
ld_plugin_message message = discard_message;
int api_version = 0;
struct claimed_file {
lto_module_t M;
void *handle;
- void *buf;
std::vector<ld_plugin_symbol> syms;
};
lto_codegen_model output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
+ std::string output_name = "";
std::list<claimed_file> Modules;
std::vector<sys::Path> Cleanup;
}
-ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
- int *claimed);
-ld_plugin_status all_symbols_read_hook(void);
-ld_plugin_status cleanup_hook(void);
+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 as_path;
+ static std::vector<std::string> pass_through;
+ static std::string extra_library_path;
+ // 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("as=")) {
+ if (!as_path.empty()) {
+ (*message)(LDPL_WARNING, "Path to as specified twice. "
+ "Discarding %s", opt_);
+ } else {
+ as_path = opt.substr(strlen("as="));
+ }
+ } else if (opt.startswith("extra-library-path=")) {
+ extra_library_path = opt.substr(strlen("extra_library_path="));
+ } else if (opt.startswith("pass-through=")) {
+ llvm::StringRef item = opt.substr(strlen("pass-through="));
+ pass_through.push_back(item.str());
+ } 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) {
// for services.
bool registeredClaimFile = false;
- bool registeredAllSymbolsRead = false;
- bool registeredCleanup = false;
for (; tv->tv_tag != LDPT_NULL; ++tv) {
switch (tv->tv_tag) {
case LDPT_GOLD_VERSION: // major * 100 + minor
gold_version = tv->tv_u.tv_val;
break;
+ 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
//output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC;
break;
case LDPT_OPTION:
- (*message)(LDPL_WARNING, "Ignoring flag %s", tv->tv_u.tv_string);
+ options::process_plugin_option(tv->tv_u.tv_string);
break;
case LDPT_REGISTER_CLAIM_FILE_HOOK: {
ld_plugin_register_claim_file callback;
if ((*callback)(all_symbols_read_hook) != LDPS_OK)
return LDPS_ERR;
-
- 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;
case LDPT_ADD_INPUT_FILE:
add_input_file = tv->tv_u.tv_add_input_file;
break;
+ case LDPT_ADD_INPUT_LIBRARY:
+ add_input_library = 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_MESSAGE:
message = tv->tv_u.tv_message;
break;
}
}
- if (!registeredClaimFile || !registeredAllSymbolsRead || !registeredCleanup ||
- !add_symbols || !get_symbols || !add_input_file) {
- (*message)(LDPL_ERROR, "Not all hooks registered for LLVMgold.");
+ 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;
}
/// 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.
-ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
- int *claimed) {
+static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
+ int *claimed) {
void *buf = NULL;
- // If set, this means gold found IR in an ELF section. LLVM doesn't wrap its
- // IR in ELF, so we know it's not us. But it can also be an .a file containing
- // LLVM IR.
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",
+ (*message)(LDPL_ERROR,
+ "Failed to seek to archive member of %s at offset %d: %s\n",
file->name,
- file->offset, strerror(errno));
+ file->offset, sys::StrError(errno).c_str());
return LDPS_ERR;
}
buf = malloc(file->filesize);
if (!buf) {
- (*message)(LDPL_ERROR,
- "Failed to allocate buffer for archive member of size: %d\n",
+ (*message)(LDPL_ERROR,
+ "Failed to allocate buffer for archive member of size: %d\n",
file->filesize);
return LDPS_ERR;
}
if (read(file->fd, buf, file->filesize) != file->filesize) {
- (*message)(LDPL_ERROR,
- "Failed to read archive member of %s at offset %d: %s\n",
+ (*message)(LDPL_ERROR,
+ "Failed to read archive member of %s at offset %d: %s\n",
file->name,
- file->offset,
- strerror(errno));
+ file->offset,
+ sys::StrError(errno).c_str());
free(buf);
return LDPS_ERR;
}
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);
- cf.buf = buf;
+ 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());
break;
default:
(*message)(LDPL_ERROR, "Unknown scope attribute: %d", scope);
- free(buf);
return LDPS_ERR;
}
case LTO_SYMBOL_DEFINITION_WEAK:
sym.def = LDPK_WEAKDEF;
break;
+ case LTO_SYMBOL_DEFINITION_WEAKUNDEF:
+ sym.def = LDPK_WEAKUNDEF;
+ break;
default:
(*message)(LDPL_ERROR, "Unknown definition attribute: %d", definition);
- free(buf);
return LDPS_ERR;
}
if (!cf.syms.empty()) {
if ((*add_symbols)(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
(*message)(LDPL_ERROR, "Unable to add symbols!");
- free(buf);
return LDPS_ERR;
}
}
/// 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.
-ld_plugin_status all_symbols_read_hook(void) {
+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;
+ 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();
+ }
+ }
+
// 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.
- if (output_type == LTO_CODEGEN_PIC_MODEL_STATIC) {
- bool anySymbolsPreserved = false;
- for (std::list<claimed_file>::iterator I = Modules.begin(),
+ bool anySymbolsPreserved = false;
+ for (std::list<claimed_file>::iterator I = Modules.begin(),
E = Modules.end(); I != E; ++I) {
- (*get_symbols)(I->handle, I->syms.size(), &I->syms[0]);
- for (unsigned i = 0, e = I->syms.size(); i != e; i++) {
- (*message)(LDPL_WARNING, "def: %d visibility: %d resolution %d",
- I->syms[i].def, I->syms[i].visibility, I->syms[i].resolution);
- if (I->syms[i].resolution == LDPR_PREVAILING_DEF) {
- lto_codegen_add_must_preserve_symbol(cg, I->syms[i].name);
- anySymbolsPreserved = true;
- }
+ (*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 (options::generate_api_file)
+ api_file << I->syms[i].name << "\n";
}
}
+ }
- if (!anySymbolsPreserved) {
- // This entire file is unnecessary!
- lto_codegen_dispose(cg);
- return LDPS_OK;
- }
+ if (options::generate_api_file)
+ api_file.close();
+
+ if (!anySymbolsPreserved) {
+ // All of the IL 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.empty()) {
+ 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_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";
+ bool err = lto_codegen_write_merged_modules(cg, path.c_str());
+ if (err)
+ (*message)(LDPL_FATAL, "Failed to write the output file.");
+ if (options::generate_bc_file == options::BC_ONLY)
+ exit(0);
+ }
size_t bufsize = 0;
const char *buffer = static_cast<const char *>(lto_codegen_compile(cg,
&bufsize));
(*message)(LDPL_ERROR, "%s", ErrMsg.c_str());
return LDPS_ERR;
}
- raw_fd_ostream *objFile = new raw_fd_ostream(uniqueObjPath.c_str(), true,
- ErrMsg);
+ raw_fd_ostream objFile(uniqueObjPath.c_str(), ErrMsg,
+ raw_fd_ostream::F_Binary);
if (!ErrMsg.empty()) {
- delete objFile;
(*message)(LDPL_ERROR, "%s", ErrMsg.c_str());
return LDPS_ERR;
}
- objFile->write(buffer, bufsize);
- objFile->close();
+ objFile.write(buffer, bufsize);
+ objFile.close();
lto_codegen_dispose(cg);
- for (std::list<claimed_file>::iterator I = Modules.begin(),
- E = Modules.end(); I != E; ++I) {
- free(I->buf);
- }
- if ((*add_input_file)(const_cast<char*>(uniqueObjPath.c_str())) != LDPS_OK) {
+ if ((*add_input_file)(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());
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;
+ }
+
+ for (std::vector<std::string>::iterator i = options::pass_through.begin(),
+ e = options::pass_through.end();
+ i != e; ++i) {
+ std::string &item = *i;
+ const char *item_p = item.c_str();
+ if (llvm::StringRef(item).startswith("-l")) {
+ if (add_input_library(item_p + 2) != LDPS_OK) {
+ (*message)(LDPL_ERROR, "Unable to add library to the link.");
+ return LDPS_ERR;
+ }
+ } else {
+ if (add_input_file(item_p) != LDPS_OK) {
+ (*message)(LDPL_ERROR, "Unable to add .o file to the link.");
+ return LDPS_ERR;
+ }
+ }
+ }
+
Cleanup.push_back(uniqueObjPath);
return LDPS_OK;
}
-ld_plugin_status cleanup_hook(void) {
+static ld_plugin_status cleanup_hook(void) {
std::string ErrMsg;
for (int i = 0, e = Cleanup.size(); i != e; ++i)
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