mirror of
https://github.com/ClickHouse/ClickHouse.git
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151 lines
4.3 KiB
C++
151 lines
4.3 KiB
C++
//===- tools/lld/lld.cpp - Linker Driver Dispatcher -----------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the main function of the lld executable. The main
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// function is a thin wrapper which dispatches to the platform specific
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// driver.
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//
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// lld is a single executable that contains four different linkers for ELF,
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// COFF, WebAssembly and Mach-O. The main function dispatches according to
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// argv[0] (i.e. command name). The most common name for each target is shown
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// below:
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//
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// - ld.lld: ELF (Unix)
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// - ld64: Mach-O (macOS)
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// - lld-link: COFF (Windows)
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// - ld-wasm: WebAssembly
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//
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// lld can be invoked as "lld" along with "-flavor" option. This is for
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// backward compatibility and not recommended.
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//
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//===----------------------------------------------------------------------===//
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#include "lld/Common/Driver.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/Path.h"
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#include <cstdlib>
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using namespace lld;
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using namespace llvm;
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using namespace llvm::sys;
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/*
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enum Flavor {
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Invalid,
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Gnu, // -flavor gnu
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WinLink, // -flavor link
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Darwin, // -flavor darwin
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Wasm, // -flavor wasm
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};
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LLVM_ATTRIBUTE_NORETURN static void die(const Twine &S) {
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errs() << S << "\n";
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exit(1);
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}
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static Flavor getFlavor(StringRef S) {
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return StringSwitch<Flavor>(S)
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.CasesLower("ld", "ld.lld", "gnu", Gnu)
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.CasesLower("wasm", "ld-wasm", Wasm)
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.CaseLower("link", WinLink)
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.CasesLower("ld64", "ld64.lld", "darwin", Darwin)
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.Default(Invalid);
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}
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static bool isPETarget(const std::vector<const char *> &V) {
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for (auto It = V.begin(); It + 1 != V.end(); ++It) {
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if (StringRef(*It) != "-m")
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continue;
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StringRef S = *(It + 1);
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return S == "i386pe" || S == "i386pep" || S == "thumb2pe" || S == "arm64pe";
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}
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return false;
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}
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static Flavor parseProgname(StringRef Progname) {
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#if __APPLE__
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// Use Darwin driver for "ld" on Darwin.
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if (Progname == "ld")
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return Darwin;
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#endif
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#if LLVM_ON_UNIX
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// Use GNU driver for "ld" on other Unix-like system.
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if (Progname == "ld")
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return Gnu;
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#endif
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// Progname may be something like "lld-gnu". Parse it.
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SmallVector<StringRef, 3> V;
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Progname.split(V, "-");
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for (StringRef S : V)
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if (Flavor F = getFlavor(S))
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return F;
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return Invalid;
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}
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static Flavor parseFlavor(std::vector<const char *> &V) {
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// Parse -flavor option.
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if (V.size() > 1 && V[1] == StringRef("-flavor")) {
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if (V.size() <= 2)
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die("missing arg value for '-flavor'");
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Flavor F = getFlavor(V[2]);
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if (F == Invalid)
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die("Unknown flavor: " + StringRef(V[2]));
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V.erase(V.begin() + 1, V.begin() + 3);
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return F;
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}
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// Deduct the flavor from argv[0].
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StringRef Arg0 = path::filename(V[0]);
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if (Arg0.endswith_lower(".exe"))
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Arg0 = Arg0.drop_back(4);
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return parseProgname(Arg0);
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}
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*/
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// If this function returns true, lld calls _exit() so that it quickly
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// exits without invoking destructors of globally allocated objects.
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//
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// We don't want to do that if we are running tests though, because
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// doing that breaks leak sanitizer. So, lit sets this environment variable,
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// and we use it to detect whether we are running tests or not.
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static bool canExitEarly() { return StringRef(getenv("LLD_IN_TEST")) != "1"; }
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/// Universal linker main(). This linker emulates the gnu, darwin, or
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/// windows linker based on the argv[0] or -flavor option.
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int mainEntryClickHouseLLD(int Argc, /* const */ char **Argv) {
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InitLLVM X(Argc, Argv);
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std::vector<const char *> Args(Argv, Argv + Argc);
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/*
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switch (parseFlavor(Args)) {
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case Gnu:
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if (isPETarget(Args))
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return !mingw::link(Args);
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*/
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return !elf::link(Args, canExitEarly());
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/*
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case WinLink:
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return !coff::link(Args, canExitEarly());
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case Darwin:
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return !mach_o::link(Args, canExitEarly());
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case Wasm:
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return !wasm::link(Args, canExitEarly());
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default:
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die("lld is a generic driver.\n"
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"Invoke ld.lld (Unix), ld64.lld (macOS), lld-link (Windows), wasm-lld"
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" (WebAssembly) instead");
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}
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*/
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}
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