mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-25 00:29:20 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197997 91177308-0d34-0410-b5e6-96231b3b80d8
491 lines
15 KiB
C++
491 lines
15 KiB
C++
//===-- 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 <plugin-api.h>
|
|
#include "llvm-c/lto.h"
|
|
#include "llvm/ADT/StringSet.h"
|
|
#include "llvm/ADT/OwningPtr.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/ToolOutputFile.h"
|
|
#include "llvm/Support/system_error.h"
|
|
#include <cerrno>
|
|
#include <cstdlib>
|
|
#include <cstring>
|
|
#include <fstream>
|
|
#include <list>
|
|
#include <vector>
|
|
|
|
// Support Windows/MinGW crazyness.
|
|
#ifdef _WIN32
|
|
# include <io.h>
|
|
# define lseek _lseek
|
|
# define read _read
|
|
#endif
|
|
|
|
using namespace llvm;
|
|
|
|
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();
|
|
}
|
|
|
|
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_get_view get_view = NULL;
|
|
ld_plugin_message message = discard_message;
|
|
|
|
int api_version = 0;
|
|
int gold_version = 0;
|
|
|
|
struct claimed_file {
|
|
void *handle;
|
|
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<std::string> Cleanup;
|
|
lto_code_gen_t code_gen = NULL;
|
|
StringSet<> CannotBeHidden;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
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
|
|
case LDPO_DYN: // .so
|
|
// FIXME: Replace 3 with LDPO_PIE once that is in a released binutils.
|
|
case 3: // 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;
|
|
}
|
|
// 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);
|
|
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;
|
|
|
|
code_gen = lto_codegen_create();
|
|
} 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_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_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;
|
|
}
|
|
|
|
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) {
|
|
lto_module_t M;
|
|
const void *view;
|
|
OwningPtr<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 (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 (!lto_module_is_object_file_in_memory(view, file->filesize))
|
|
return LDPS_OK;
|
|
|
|
M = lto_module_create_from_memory(view, file->filesize);
|
|
if (!M) {
|
|
if (const char* msg = lto_get_error_message()) {
|
|
(*message)(LDPL_ERROR,
|
|
"LLVM gold plugin has failed to create LTO module: %s",
|
|
msg);
|
|
return LDPS_ERR;
|
|
}
|
|
return LDPS_OK;
|
|
}
|
|
|
|
*claimed = 1;
|
|
Modules.resize(Modules.size() + 1);
|
|
claimed_file &cf = Modules.back();
|
|
|
|
if (!options::triple.empty())
|
|
lto_module_set_target_triple(M, options::triple.c_str());
|
|
|
|
cf.handle = file->handle;
|
|
unsigned sym_count = lto_module_get_num_symbols(M);
|
|
cf.syms.reserve(sym_count);
|
|
|
|
for (unsigned i = 0; i != sym_count; ++i) {
|
|
lto_symbol_attributes attrs = lto_module_get_symbol_attribute(M, 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(M, i));
|
|
sym.name = strdup(sym.name);
|
|
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 (code_gen) {
|
|
if (lto_codegen_add_module(code_gen, M)) {
|
|
(*message)(LDPL_ERROR, "Error linking module: %s",
|
|
lto_get_error_message());
|
|
return LDPS_ERR;
|
|
}
|
|
}
|
|
|
|
lto_module_dispose(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(code_gen);
|
|
|
|
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)) {
|
|
lto_codegen_add_must_preserve_symbol(code_gen, I->syms[i].name);
|
|
|
|
if (options::generate_api_file)
|
|
api_file << I->syms[i].name << "\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
if (options::generate_api_file)
|
|
api_file.close();
|
|
|
|
lto_codegen_set_pic_model(code_gen, output_type);
|
|
lto_codegen_set_debug_model(code_gen, LTO_DEBUG_MODEL_DWARF);
|
|
if (!options::mcpu.empty())
|
|
lto_codegen_set_cpu(code_gen, options::mcpu.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(code_gen, (*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(code_gen, path.c_str());
|
|
if (err)
|
|
(*message)(LDPL_FATAL, "Failed to write the output file.");
|
|
if (options::generate_bc_file == options::BC_ONLY) {
|
|
lto_codegen_dispose(code_gen);
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
std::string ObjPath;
|
|
{
|
|
const char *Temp;
|
|
if (lto_codegen_compile_to_file(code_gen, &Temp)) {
|
|
(*message)(LDPL_ERROR, "Could not produce a combined object file\n");
|
|
}
|
|
ObjPath = Temp;
|
|
}
|
|
|
|
lto_codegen_dispose(code_gen);
|
|
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) {
|
|
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;
|
|
}
|