148 lines
5.0 KiB
C++
148 lines
5.0 KiB
C++
//===--- CloudABI.cpp - CloudABI ToolChain Implementations ------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "CloudABI.h"
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#include "InputInfo.h"
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#include "CommonArgs.h"
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#include "clang/Driver/Compilation.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/Options.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Support/Path.h"
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using namespace clang::driver;
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using namespace clang::driver::tools;
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using namespace clang::driver::toolchains;
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using namespace clang;
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using namespace llvm::opt;
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void cloudabi::Linker::ConstructJob(Compilation &C, const JobAction &JA,
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const InputInfo &Output,
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const InputInfoList &Inputs,
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const ArgList &Args,
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const char *LinkingOutput) const {
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const ToolChain &ToolChain = getToolChain();
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const Driver &D = ToolChain.getDriver();
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ArgStringList CmdArgs;
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// Silence warning for "clang -g foo.o -o foo"
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Args.ClaimAllArgs(options::OPT_g_Group);
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// and "clang -emit-llvm foo.o -o foo"
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Args.ClaimAllArgs(options::OPT_emit_llvm);
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// and for "clang -w foo.o -o foo". Other warning options are already
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// handled somewhere else.
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Args.ClaimAllArgs(options::OPT_w);
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if (!D.SysRoot.empty())
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CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
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// CloudABI only supports static linkage.
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CmdArgs.push_back("-Bstatic");
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CmdArgs.push_back("--no-dynamic-linker");
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// Provide PIE linker flags in case PIE is default for the architecture.
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if (ToolChain.isPIEDefault()) {
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CmdArgs.push_back("-pie");
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CmdArgs.push_back("-zrelro");
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}
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CmdArgs.push_back("--eh-frame-hdr");
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CmdArgs.push_back("--gc-sections");
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if (Output.isFilename()) {
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CmdArgs.push_back("-o");
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CmdArgs.push_back(Output.getFilename());
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} else {
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assert(Output.isNothing() && "Invalid output.");
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}
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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
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CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
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CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtbegin.o")));
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}
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Args.AddAllArgs(CmdArgs, options::OPT_L);
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ToolChain.AddFilePathLibArgs(Args, CmdArgs);
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Args.AddAllArgs(CmdArgs,
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{options::OPT_T_Group, options::OPT_e, options::OPT_s,
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options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
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if (D.isUsingLTO()) {
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assert(!Inputs.empty() && "Must have at least one input.");
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addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0],
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D.getLTOMode() == LTOK_Thin);
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}
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AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
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if (ToolChain.ShouldLinkCXXStdlib(Args))
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ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
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CmdArgs.push_back("-lc");
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CmdArgs.push_back("-lcompiler_rt");
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}
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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
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CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
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const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
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C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
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}
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// CloudABI - CloudABI tool chain which can call ld(1) directly.
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CloudABI::CloudABI(const Driver &D, const llvm::Triple &Triple,
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const ArgList &Args)
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: Generic_ELF(D, Triple, Args) {
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SmallString<128> P(getDriver().Dir);
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llvm::sys::path::append(P, "..", getTriple().str(), "lib");
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getFilePaths().push_back(std::string(P.str()));
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}
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void CloudABI::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
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llvm::opt::ArgStringList &CC1Args) const {
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SmallString<128> P(getDriver().Dir);
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llvm::sys::path::append(P, "..", getTriple().str(), "include/c++/v1");
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addSystemInclude(DriverArgs, CC1Args, P.str());
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}
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void CloudABI::AddCXXStdlibLibArgs(const ArgList &Args,
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ArgStringList &CmdArgs) const {
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CmdArgs.push_back("-lc++");
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CmdArgs.push_back("-lc++abi");
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CmdArgs.push_back("-lunwind");
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}
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Tool *CloudABI::buildLinker() const {
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return new tools::cloudabi::Linker(*this);
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}
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bool CloudABI::isPIEDefault() const {
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// Only enable PIE on architectures that support PC-relative
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// addressing. PC-relative addressing is required, as the process
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// startup code must be able to relocate itself.
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switch (getTriple().getArch()) {
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case llvm::Triple::aarch64:
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case llvm::Triple::x86_64:
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return true;
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default:
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return false;
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}
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}
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SanitizerMask CloudABI::getSupportedSanitizers() const {
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SanitizerMask Res = ToolChain::getSupportedSanitizers();
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Res |= SanitizerKind::SafeStack;
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return Res;
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}
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SanitizerMask CloudABI::getDefaultSanitizers() const {
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return SanitizerKind::SafeStack;
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}
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