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llvm-capstone/lld/MinGW/Driver.cpp
Martin Storsjö f8340c8c5d [LLD] [MinGW] Add more options for disabling flags in the executable 
In e72403f96de7f1c681acd5968f72aa986412dfce, we added the flag
"--no-dynamicbase" for disabling the dynamicbase flag which we set
by default. At the time, ld.bfd didn't have any corresponding
option (as ld.bfd defaulted to not setting the flag). Almost at
the same time, corresponding options were added to ld.bfd for
disabling it (while it was being enabled by default), with a
different name, "--disable-dynamicbase".

Thus add the "--disable-dynamicbase" option. Make this default
one advertised in the help listing, but keep the "--no-dynamicbase"
form as an alias. Also improve checking for the last option set
if there are multiple ones on the same command line.

Also add corresponding disable options for a lot of other flags
that we set by default, also added in ld.bfd in the same commit:
https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=514b4e191d5f46de8e142fe216e677a35fa9c4bb

Differential Revision: https://reviews.llvm.org/D107930
2021-08-12 13:27:09 +03:00

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//===- MinGW/Driver.cpp ---------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// MinGW is a GNU development environment for Windows. It consists of GNU
// tools such as GCC and GNU ld. Unlike Cygwin, there's no POSIX-compatible
// layer, as it aims to be a native development toolchain.
//
// lld/MinGW is a drop-in replacement for GNU ld/MinGW.
//
// Being a native development tool, a MinGW linker is not very different from
// Microsoft link.exe, so a MinGW linker can be implemented as a thin wrapper
// for lld/COFF. This driver takes Unix-ish command line options, translates
// them to Windows-ish ones, and then passes them to lld/COFF.
//
// When this driver calls the lld/COFF driver, it passes a hidden option
// "-lldmingw" along with other user-supplied options, to run the lld/COFF
// linker in "MinGW mode".
//
// There are subtle differences between MS link.exe and GNU ld/MinGW, and GNU
// ld/MinGW implements a few GNU-specific features. Such features are directly
// implemented in lld/COFF and enabled only when the linker is running in MinGW
// mode.
//
//===----------------------------------------------------------------------===//
#include "lld/Common/Driver.h"
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/Memory.h"
#include "lld/Common/Version.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/Path.h"
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#endif
using namespace lld;
using namespace llvm;
// Create OptTable
enum {
OPT_INVALID = 0,
#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
#include "Options.inc"
#undef OPTION
};
// Create prefix string literals used in Options.td
#define PREFIX(NAME, VALUE) static const char *const NAME[] = VALUE;
#include "Options.inc"
#undef PREFIX
// Create table mapping all options defined in Options.td
static const opt::OptTable::Info infoTable[] = {
#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \
{X1, X2, X10, X11, OPT_##ID, opt::Option::KIND##Class, \
X9, X8, OPT_##GROUP, OPT_##ALIAS, X7, X12},
#include "Options.inc"
#undef OPTION
};
namespace {
class MinGWOptTable : public opt::OptTable {
public:
MinGWOptTable() : OptTable(infoTable, false) {}
opt::InputArgList parse(ArrayRef<const char *> argv);
};
} // namespace
static void printHelp(const char *argv0) {
MinGWOptTable().printHelp(
lld::outs(), (std::string(argv0) + " [options] file...").c_str(), "lld",
false /*ShowHidden*/, true /*ShowAllAliases*/);
lld::outs() << "\n";
}
static cl::TokenizerCallback getQuotingStyle() {
if (Triple(sys::getProcessTriple()).getOS() == Triple::Win32)
return cl::TokenizeWindowsCommandLine;
return cl::TokenizeGNUCommandLine;
}
opt::InputArgList MinGWOptTable::parse(ArrayRef<const char *> argv) {
unsigned missingIndex;
unsigned missingCount;
SmallVector<const char *, 256> vec(argv.data(), argv.data() + argv.size());
cl::ExpandResponseFiles(saver, getQuotingStyle(), vec);
opt::InputArgList args = this->ParseArgs(vec, missingIndex, missingCount);
if (missingCount)
error(StringRef(args.getArgString(missingIndex)) + ": missing argument");
for (auto *arg : args.filtered(OPT_UNKNOWN))
error("unknown argument: " + arg->getAsString(args));
return args;
}
// Find a file by concatenating given paths.
static Optional<std::string> findFile(StringRef path1, const Twine &path2) {
SmallString<128> s;
sys::path::append(s, path1, path2);
if (sys::fs::exists(s))
return std::string(s);
return None;
}
// This is for -lfoo. We'll look for libfoo.dll.a or libfoo.a from search paths.
static std::string
searchLibrary(StringRef name, ArrayRef<StringRef> searchPaths, bool bStatic) {
if (name.startswith(":")) {
for (StringRef dir : searchPaths)
if (Optional<std::string> s = findFile(dir, name.substr(1)))
return *s;
error("unable to find library -l" + name);
return "";
}
for (StringRef dir : searchPaths) {
if (!bStatic) {
if (Optional<std::string> s = findFile(dir, "lib" + name + ".dll.a"))
return *s;
if (Optional<std::string> s = findFile(dir, name + ".dll.a"))
return *s;
}
if (Optional<std::string> s = findFile(dir, "lib" + name + ".a"))
return *s;
if (!bStatic) {
if (Optional<std::string> s = findFile(dir, name + ".lib"))
return *s;
if (Optional<std::string> s = findFile(dir, "lib" + name + ".dll"))
return *s;
if (Optional<std::string> s = findFile(dir, name + ".dll"))
return *s;
}
}
error("unable to find library -l" + name);
return "";
}
// Convert Unix-ish command line arguments to Windows-ish ones and
// then call coff::link.
bool mingw::link(ArrayRef<const char *> argsArr, bool canExitEarly,
raw_ostream &stdoutOS, raw_ostream &stderrOS) {
lld::stdoutOS = &stdoutOS;
lld::stderrOS = &stderrOS;
stderrOS.enable_colors(stderrOS.has_colors());
MinGWOptTable parser;
opt::InputArgList args = parser.parse(argsArr.slice(1));
if (errorCount())
return false;
if (args.hasArg(OPT_help)) {
printHelp(argsArr[0]);
return true;
}
// A note about "compatible with GNU linkers" message: this is a hack for
// scripts generated by GNU Libtool 2.4.6 (released in February 2014 and
// still the newest version in March 2017) or earlier to recognize LLD as
// a GNU compatible linker. As long as an output for the -v option
// contains "GNU" or "with BFD", they recognize us as GNU-compatible.
if (args.hasArg(OPT_v) || args.hasArg(OPT_version))
message(getLLDVersion() + " (compatible with GNU linkers)");
// The behavior of -v or --version is a bit strange, but this is
// needed for compatibility with GNU linkers.
if (args.hasArg(OPT_v) && !args.hasArg(OPT_INPUT) && !args.hasArg(OPT_l))
return true;
if (args.hasArg(OPT_version))
return true;
if (!args.hasArg(OPT_INPUT) && !args.hasArg(OPT_l)) {
error("no input files");
return false;
}
std::vector<std::string> linkArgs;
auto add = [&](const Twine &s) { linkArgs.push_back(s.str()); };
add("lld-link");
add("-lldmingw");
if (auto *a = args.getLastArg(OPT_entry)) {
StringRef s = a->getValue();
if (args.getLastArgValue(OPT_m) == "i386pe" && s.startswith("_"))
add("-entry:" + s.substr(1));
else
add("-entry:" + s);
}
if (args.hasArg(OPT_major_os_version, OPT_minor_os_version,
OPT_major_subsystem_version, OPT_minor_subsystem_version)) {
StringRef majOSVer = args.getLastArgValue(OPT_major_os_version, "6");
StringRef minOSVer = args.getLastArgValue(OPT_minor_os_version, "0");
StringRef majSubSysVer = "6";
StringRef minSubSysVer = "0";
StringRef subSysName = "default";
StringRef subSysVer;
// Iterate over --{major,minor}-subsystem-version and --subsystem, and pick
// the version number components from the last one of them that specifies
// a version.
for (auto *a : args.filtered(OPT_major_subsystem_version,
OPT_minor_subsystem_version, OPT_subs)) {
switch (a->getOption().getID()) {
case OPT_major_subsystem_version:
majSubSysVer = a->getValue();
break;
case OPT_minor_subsystem_version:
minSubSysVer = a->getValue();
break;
case OPT_subs:
std::tie(subSysName, subSysVer) = StringRef(a->getValue()).split(':');
if (!subSysVer.empty()) {
if (subSysVer.contains('.'))
std::tie(majSubSysVer, minSubSysVer) = subSysVer.split('.');
else
majSubSysVer = subSysVer;
}
break;
}
}
add("-osversion:" + majOSVer + "." + minOSVer);
add("-subsystem:" + subSysName + "," + majSubSysVer + "." + minSubSysVer);
} else if (args.hasArg(OPT_subs)) {
StringRef subSys = args.getLastArgValue(OPT_subs, "default");
StringRef subSysName, subSysVer;
std::tie(subSysName, subSysVer) = subSys.split(':');
StringRef sep = subSysVer.empty() ? "" : ",";
add("-subsystem:" + subSysName + sep + subSysVer);
}
if (auto *a = args.getLastArg(OPT_out_implib))
add("-implib:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_stack))
add("-stack:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_output_def))
add("-output-def:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_image_base))
add("-base:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_map))
add("-lldmap:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_reproduce))
add("-reproduce:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_thinlto_cache_dir))
add("-lldltocache:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_file_alignment))
add("-filealign:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_section_alignment))
add("-align:" + StringRef(a->getValue()));
if (auto *a = args.getLastArg(OPT_o))
add("-out:" + StringRef(a->getValue()));
else if (args.hasArg(OPT_shared))
add("-out:a.dll");
else
add("-out:a.exe");
if (auto *a = args.getLastArg(OPT_pdb)) {
add("-debug");
StringRef v = a->getValue();
if (!v.empty())
add("-pdb:" + v);
} else if (args.hasArg(OPT_strip_debug)) {
add("-debug:symtab");
} else if (!args.hasArg(OPT_strip_all)) {
add("-debug:dwarf");
}
if (args.hasFlag(OPT_fatal_warnings, OPT_no_fatal_warnings, false))
add("-WX");
else
add("-WX:no");
if (args.hasFlag(OPT_enable_stdcall_fixup, OPT_disable_stdcall_fixup, false))
add("-stdcall-fixup");
else if (args.hasArg(OPT_disable_stdcall_fixup))
add("-stdcall-fixup:no");
if (args.hasArg(OPT_shared))
add("-dll");
if (args.hasArg(OPT_verbose))
add("-verbose");
if (args.hasArg(OPT_exclude_all_symbols))
add("-exclude-all-symbols");
if (args.hasArg(OPT_export_all_symbols))
add("-export-all-symbols");
if (args.hasArg(OPT_large_address_aware))
add("-largeaddressaware");
if (args.hasArg(OPT_kill_at))
add("-kill-at");
if (args.hasArg(OPT_appcontainer))
add("-appcontainer");
if (args.hasFlag(OPT_no_seh, OPT_disable_no_seh, false))
add("-noseh");
if (args.getLastArgValue(OPT_m) != "thumb2pe" &&
args.getLastArgValue(OPT_m) != "arm64pe" &&
args.hasFlag(OPT_disable_dynamicbase, OPT_dynamicbase, false))
add("-dynamicbase:no");
if (args.hasFlag(OPT_disable_high_entropy_va, OPT_high_entropy_va, false))
add("-highentropyva:no");
if (args.hasFlag(OPT_disable_nxcompat, OPT_nxcompat, false))
add("-nxcompat:no");
if (args.hasFlag(OPT_disable_tsaware, OPT_tsaware, false))
add("-tsaware:no");
if (args.hasFlag(OPT_no_insert_timestamp, OPT_insert_timestamp, false))
add("-timestamp:0");
if (args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, false))
add("-opt:ref");
else
add("-opt:noref");
if (args.hasFlag(OPT_demangle, OPT_no_demangle, true))
add("-demangle");
else
add("-demangle:no");
if (args.hasFlag(OPT_enable_auto_import, OPT_disable_auto_import, true))
add("-auto-import");
else
add("-auto-import:no");
if (args.hasFlag(OPT_enable_runtime_pseudo_reloc,
OPT_disable_runtime_pseudo_reloc, true))
add("-runtime-pseudo-reloc");
else
add("-runtime-pseudo-reloc:no");
if (args.hasFlag(OPT_allow_multiple_definition,
OPT_no_allow_multiple_definition, false))
add("-force:multiple");
if (auto *a = args.getLastArg(OPT_icf)) {
StringRef s = a->getValue();
if (s == "all")
add("-opt:icf");
else if (s == "safe" || s == "none")
add("-opt:noicf");
else
error("unknown parameter: --icf=" + s);
} else {
add("-opt:noicf");
}
if (auto *a = args.getLastArg(OPT_m)) {
StringRef s = a->getValue();
if (s == "i386pe")
add("-machine:x86");
else if (s == "i386pep")
add("-machine:x64");
else if (s == "thumb2pe")
add("-machine:arm");
else if (s == "arm64pe")
add("-machine:arm64");
else
error("unknown parameter: -m" + s);
}
for (auto *a : args.filtered(OPT_mllvm))
add("-mllvm:" + StringRef(a->getValue()));
for (auto *a : args.filtered(OPT_Xlink))
add(a->getValue());
if (args.getLastArgValue(OPT_m) == "i386pe")
add("-alternatename:__image_base__=___ImageBase");
else
add("-alternatename:__image_base__=__ImageBase");
for (auto *a : args.filtered(OPT_require_defined))
add("-include:" + StringRef(a->getValue()));
for (auto *a : args.filtered(OPT_undefined))
add("-includeoptional:" + StringRef(a->getValue()));
for (auto *a : args.filtered(OPT_delayload))
add("-delayload:" + StringRef(a->getValue()));
for (auto *a : args.filtered(OPT_wrap))
add("-wrap:" + StringRef(a->getValue()));
std::vector<StringRef> searchPaths;
for (auto *a : args.filtered(OPT_L)) {
searchPaths.push_back(a->getValue());
add("-libpath:" + StringRef(a->getValue()));
}
StringRef prefix = "";
bool isStatic = false;
for (auto *a : args) {
switch (a->getOption().getID()) {
case OPT_INPUT:
if (StringRef(a->getValue()).endswith_insensitive(".def"))
add("-def:" + StringRef(a->getValue()));
else
add(prefix + StringRef(a->getValue()));
break;
case OPT_l:
add(prefix + searchLibrary(a->getValue(), searchPaths, isStatic));
break;
case OPT_whole_archive:
prefix = "-wholearchive:";
break;
case OPT_no_whole_archive:
prefix = "";
break;
case OPT_Bstatic:
isStatic = true;
break;
case OPT_Bdynamic:
isStatic = false;
break;
}
}
if (errorCount())
return false;
if (args.hasArg(OPT_verbose) || args.hasArg(OPT__HASH_HASH_HASH))
lld::errs() << llvm::join(linkArgs, " ") << "\n";
if (args.hasArg(OPT__HASH_HASH_HASH))
return true;
// Repack vector of strings to vector of const char pointers for coff::link.
std::vector<const char *> vec;
for (const std::string &s : linkArgs)
vec.push_back(s.c_str());
// Pass the actual binary name, to make error messages be printed with
// the right prefix.
vec[0] = argsArr[0];
return coff::link(vec, canExitEarly, stdoutOS, stderrOS);
}
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