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//===- DlltoolDriver.cpp - dlltool.exe-compatible driver ------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Defines an interface to a dlltool.exe-compatible driver.
//
//===----------------------------------------------------------------------===//
#include "llvm/ToolDrivers/llvm-dlltool/DlltoolDriver.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/COFFImportFile.h"
#include "llvm/Object/COFFModuleDefinition.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/Path.h"
#include <optional>
#include <vector>
using namespace llvm;
using namespace llvm::object;
using namespace llvm::COFF;
namespace {
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
};
#define PREFIX(NAME, VALUE) \
static constexpr StringLiteral NAME##_init[] = VALUE; \
static constexpr ArrayRef<StringLiteral> NAME(NAME##_init, \
std::size(NAME##_init) - 1);
#include "Options.inc"
#undef PREFIX
static constexpr opt::OptTable::Info InfoTable[] = {
#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \
{X1, X2, X10, X11, OPT_##ID, llvm::opt::Option::KIND##Class, \
X9, X8, OPT_##GROUP, OPT_##ALIAS, X7, X12},
#include "Options.inc"
#undef OPTION
};
class DllOptTable : public opt::GenericOptTable {
public:
DllOptTable() : opt::GenericOptTable(InfoTable, false) {}
};
// Opens a file. Path has to be resolved already.
std::unique_ptr<MemoryBuffer> openFile(const Twine &Path) {
ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> MB = MemoryBuffer::getFile(Path);
if (std::error_code EC = MB.getError()) {
llvm::errs() << "cannot open file " << Path << ": " << EC.message() << "\n";
return nullptr;
}
return std::move(*MB);
}
MachineTypes getEmulation(StringRef S) {
return StringSwitch<MachineTypes>(S)
.Case("i386", IMAGE_FILE_MACHINE_I386)
.Case("i386:x86-64", IMAGE_FILE_MACHINE_AMD64)
.Case("arm", IMAGE_FILE_MACHINE_ARMNT)
.Case("arm64", IMAGE_FILE_MACHINE_ARM64)
.Default(IMAGE_FILE_MACHINE_UNKNOWN);
}
MachineTypes getMachine(Triple T) {
switch (T.getArch()) {
case Triple::x86:
return COFF::IMAGE_FILE_MACHINE_I386;
case Triple::x86_64:
return COFF::IMAGE_FILE_MACHINE_AMD64;
case Triple::arm:
return COFF::IMAGE_FILE_MACHINE_ARMNT;
case Triple::aarch64:
return COFF::IMAGE_FILE_MACHINE_ARM64;
default:
return COFF::IMAGE_FILE_MACHINE_UNKNOWN;
}
}
MachineTypes getDefaultMachine() {
return getMachine(Triple(sys::getDefaultTargetTriple()));
}
std::optional<std::string> getPrefix(StringRef Argv0) {
StringRef ProgName = llvm::sys::path::stem(Argv0);
// x86_64-w64-mingw32-dlltool -> x86_64-w64-mingw32
// llvm-dlltool -> None
// aarch64-w64-mingw32-llvm-dlltool-10.exe -> aarch64-w64-mingw32
ProgName = ProgName.rtrim("0123456789.-");
if (!ProgName.consume_back_insensitive("dlltool"))
return std::nullopt;
ProgName.consume_back_insensitive("llvm-");
ProgName.consume_back_insensitive("-");
return ProgName.str();
}
} // namespace
int llvm::dlltoolDriverMain(llvm::ArrayRef<const char *> ArgsArr) {
DllOptTable Table;
unsigned MissingIndex;
unsigned MissingCount;
llvm::opt::InputArgList Args =
Table.ParseArgs(ArgsArr.slice(1), MissingIndex, MissingCount);
if (MissingCount) {
llvm::errs() << Args.getArgString(MissingIndex) << ": missing argument\n";
return 1;
}
// Handle when no input or output is specified
if (Args.hasArgNoClaim(OPT_INPUT) ||
(!Args.hasArgNoClaim(OPT_d) && !Args.hasArgNoClaim(OPT_l))) {
Table.printHelp(outs(), "llvm-dlltool [options] file...", "llvm-dlltool",
false);
llvm::outs() << "\nTARGETS: i386, i386:x86-64, arm, arm64\n";
return 1;
}
for (auto *Arg : Args.filtered(OPT_UNKNOWN))
llvm::errs() << "ignoring unknown argument: " << Arg->getAsString(Args)
<< "\n";
if (!Args.hasArg(OPT_d)) {
llvm::errs() << "no definition file specified\n";
return 1;
}
std::unique_ptr<MemoryBuffer> MB =
openFile(Args.getLastArg(OPT_d)->getValue());
if (!MB)
return 1;
if (!MB->getBufferSize()) {
llvm::errs() << "definition file empty\n";
return 1;
}
COFF::MachineTypes Machine = getDefaultMachine();
if (std::optional<std::string> Prefix = getPrefix(ArgsArr[0])) {
Triple T(*Prefix);
if (T.getArch() != Triple::UnknownArch)
Machine = getMachine(T);
}
if (auto *Arg = Args.getLastArg(OPT_m))
Machine = getEmulation(Arg->getValue());
if (Machine == IMAGE_FILE_MACHINE_UNKNOWN) {
llvm::errs() << "unknown target\n";
return 1;
}
Expected<COFFModuleDefinition> Def =
parseCOFFModuleDefinition(*MB, Machine, true);
if (!Def) {
llvm::errs() << "error parsing definition\n"
<< errorToErrorCode(Def.takeError()).message();
return 1;
}
// Do this after the parser because parseCOFFModuleDefinition sets OutputFile.
if (auto *Arg = Args.getLastArg(OPT_D))
Def->OutputFile = Arg->getValue();
if (Def->OutputFile.empty()) {
llvm::errs() << "no DLL name specified\n";
return 1;
}
std::string Path = std::string(Args.getLastArgValue(OPT_l));
// If ExtName is set (if the "ExtName = Name" syntax was used), overwrite
// Name with ExtName and clear ExtName. When only creating an import
// library and not linking, the internal name is irrelevant. This avoids
// cases where writeImportLibrary tries to transplant decoration from
// symbol decoration onto ExtName.
for (COFFShortExport& E : Def->Exports) {
if (!E.ExtName.empty()) {
E.Name = E.ExtName;
E.ExtName.clear();
}
}
if (Machine == IMAGE_FILE_MACHINE_I386 && Args.getLastArg(OPT_k)) {
for (COFFShortExport& E : Def->Exports) {
if (!E.AliasTarget.empty() || (!E.Name.empty() && E.Name[0] == '?'))
continue;
E.SymbolName = E.Name;
// Trim off the trailing decoration. Symbols will always have a
// starting prefix here (either _ for cdecl/stdcall, @ for fastcall
// or ? for C++ functions). Vectorcall functions won't have any
// fixed prefix, but the function base name will still be at least
// one char.
E.Name = E.Name.substr(0, E.Name.find('@', 1));
// By making sure E.SymbolName != E.Name for decorated symbols,
// writeImportLibrary writes these symbols with the type
// IMPORT_NAME_UNDECORATE.
}
}
if (!Path.empty() &&
writeImportLibrary(Def->OutputFile, Path, Def->Exports, Machine, true))
return 1;
return 0;
}
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