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7f0e6c31c25530352aa6e4cd9e2bdc4381368eba
llvm/lld/MinGW/Driver.cpp
Martin Storsjö 7f0e6c31c2 [LLD] [COFF] Add options for disabling auto import and runtime pseudo relocs 
Allow disabling either the full auto import feature, or just
forbidding the cases that require runtime fixups.

As long as all auto imported variables are referenced from separate
.refptr$<name> sections, we can alias them on top of the IAT entries
and don't actually need any runtime fixups via pseudo relocations.
LLVM generates references to variables in .refptr stubs, if it
isn't known that the variable for sure is defined in the same object
module. Runtime pseudo relocs are needed if the addresses of auto
imported variables are used in constant initializers though.

Fixing up runtime pseudo relocations requires the use of
VirtualProtect (which is disallowed in WinStore/UWP apps) or
VirtualProtectFromApp. To allow any risk of ambiguity, allow
rejecting cases that would require this at the linker stage.

This adds support for the --disable-runtime-pseudo-reloc and
--disable-auto-import options in the MinGW driver (matching GNU ld.bfd)
with corresponding lld private options in the COFF driver.

Differential Revision: https://reviews.llvm.org/D78923
2020-05-14 13:05:14 +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")) {
error("lld doesn't support linking directly against " + *s +
", use an import library");
return "";
}
if (Optional<std::string> s = findFile(dir, name + ".dll")) {
error("lld doesn't support linking directly against " + *s +
", use an import library");
return "";
}
}
}
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)) {
auto *majOSVer = args.getLastArg(OPT_major_os_version);
auto *minOSVer = args.getLastArg(OPT_minor_os_version);
auto *majSubSysVer = args.getLastArg(OPT_major_subsystem_version);
auto *minSubSysVer = args.getLastArg(OPT_minor_subsystem_version);
if (majOSVer && majSubSysVer &&
StringRef(majOSVer->getValue()) != StringRef(majSubSysVer->getValue()))
warn("--major-os-version and --major-subsystem-version set to differing "
"versions, not supported");
if (minOSVer && minSubSysVer &&
StringRef(minOSVer->getValue()) != StringRef(minSubSysVer->getValue()))
warn("--minor-os-version and --minor-subsystem-version set to differing "
"versions, not supported");
StringRef subSys = args.getLastArgValue(OPT_subs, "default");
StringRef major = majOSVer ? majOSVer->getValue()
: majSubSysVer ? majSubSysVer->getValue() : "6";
StringRef minor = minOSVer ? minOSVer->getValue()
: minSubSysVer ? minSubSysVer->getValue() : "";
StringRef sep = minor.empty() ? "" : ".";
add("-subsystem:" + subSys + "," + major + sep + minor);
} else if (auto *a = args.getLastArg(OPT_subs)) {
add("-subsystem:" + StringRef(a->getValue()));
}
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_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.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.getLastArgValue(OPT_m) != "thumb2pe" &&
args.getLastArgValue(OPT_m) != "arm64pe" && !args.hasArg(OPT_dynamicbase))
add("-dynamicbase: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_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 (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()));
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_lower(".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::outs() << 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());
return coff::link(vec, true, stdoutOS, stderrOS);
}
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